kernel/drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004 - 2005
   6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7  * Copyright (C) Alex Aizman, 2004 - 2005
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <linux/bsg-lib.h>
  27 #include <linux/idr.h>
  28 #include <net/tcp.h>
  29 #include <scsi/scsi.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_iscsi.h>
  34 #include <scsi/iscsi_if.h>
  35 #include <scsi/scsi_cmnd.h>
  36 #include <scsi/scsi_bsg_iscsi.h>
  37
  38 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  39
  40 static int dbg_session;
  41 module_param_named(debug_session, dbg_session, int,
  42                    S_IRUGO | S_IWUSR);
  43 MODULE_PARM_DESC(debug_session,
  44                  "Turn on debugging for sessions in scsi_transport_iscsi "
  45                  "module. Set to 1 to turn on, and zero to turn off. Default "
  46                  "is off.");
  47
  48 static int dbg_conn;
  49 module_param_named(debug_conn, dbg_conn, int,
  50                    S_IRUGO | S_IWUSR);
  51 MODULE_PARM_DESC(debug_conn,
  52                  "Turn on debugging for connections in scsi_transport_iscsi "
  53                  "module. Set to 1 to turn on, and zero to turn off. Default "
  54                  "is off.");
  55
  56 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  57         do {                                                            \
  58                 if (dbg_session)                                        \
  59                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  60                                                  "%s: " dbg_fmt,        \
  61                                                  __func__, ##arg);      \
  62         } while (0);
  63
  64 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  65         do {                                                            \
  66                 if (dbg_conn)                                           \
  67                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  68                                               "%s: " dbg_fmt,           \
  69                                               __func__, ##arg); \
  70         } while (0);
  71
  72 struct iscsi_internal {
  73         struct scsi_transport_template t;
  74         struct iscsi_transport *iscsi_transport;
  75         struct list_head list;
  76         struct device dev;
  77
  78         struct transport_container conn_cont;
  79         struct transport_container session_cont;
  80 };
  81
  82 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  83 static struct workqueue_struct *iscsi_eh_timer_workq;
  84
  85 static DEFINE_IDA(iscsi_sess_ida);
  86 /*
  87  * list of registered transports and lock that must
  88  * be held while accessing list. The iscsi_transport_lock must
  89  * be acquired after the rx_queue_mutex.
  90  */
  91 static LIST_HEAD(iscsi_transports);
  92 static DEFINE_SPINLOCK(iscsi_transport_lock);
  93
  94 #define to_iscsi_internal(tmpl) \
  95         container_of(tmpl, struct iscsi_internal, t)
  96
  97 #define dev_to_iscsi_internal(_dev) \
  98         container_of(_dev, struct iscsi_internal, dev)
  99
 100 static void iscsi_transport_release(struct device *dev)
 101 {
 102         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 103         kfree(priv);
 104 }
 105
 106 /*
 107  * iscsi_transport_class represents the iscsi_transports that are
 108  * registered.
 109  */
 110 static struct class iscsi_transport_class = {
 111         .name = "iscsi_transport",
 112         .dev_release = iscsi_transport_release,
 113 };
 114
 115 static ssize_t
 116 show_transport_handle(struct device *dev, struct device_attribute *attr,
 117                       char *buf)
 118 {
 119         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 120         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 121 }
 122 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 123
 124 #define show_transport_attr(name, format)                               \
 125 static ssize_t                                                          \
 126 show_transport_##name(struct device *dev,                               \
 127                       struct device_attribute *attr,char *buf)          \
 128 {                                                                       \
 129         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 130         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 131 }                                                                       \
 132 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 133
 134 show_transport_attr(caps, "0x%x");
 135
 136 static struct attribute *iscsi_transport_attrs[] = {
 137         &dev_attr_handle.attr,
 138         &dev_attr_caps.attr,
 139         NULL,
 140 };
 141
 142 static struct attribute_group iscsi_transport_group = {
 143         .attrs = iscsi_transport_attrs,
 144 };
 145
 146 /*
 147  * iSCSI endpoint attrs
 148  */
 149 #define iscsi_dev_to_endpoint(_dev) \
 150         container_of(_dev, struct iscsi_endpoint, dev)
 151
 152 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 153 struct device_attribute dev_attr_##_prefix##_##_name =  \
 154         __ATTR(_name,_mode,_show,_store)
 155
 156 static void iscsi_endpoint_release(struct device *dev)
 157 {
 158         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 159         kfree(ep);
 160 }
 161
 162 static struct class iscsi_endpoint_class = {
 163         .name = "iscsi_endpoint",
 164         .dev_release = iscsi_endpoint_release,
 165 };
 166
 167 static ssize_t
 168 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 169 {
 170         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 171         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 172 }
 173 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 174
 175 static struct attribute *iscsi_endpoint_attrs[] = {
 176         &dev_attr_ep_handle.attr,
 177         NULL,
 178 };
 179
 180 static struct attribute_group iscsi_endpoint_group = {
 181         .attrs = iscsi_endpoint_attrs,
 182 };
 183
 184 #define ISCSI_MAX_EPID -1
 185
 186 static int iscsi_match_epid(struct device *dev, const void *data)
 187 {
 188         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 189         const uint64_t *epid = data;
 190
 191         return *epid == ep->id;
 192 }
 193
 194 struct iscsi_endpoint *
 195 iscsi_create_endpoint(int dd_size)
 196 {
 197         struct device *dev;
 198         struct iscsi_endpoint *ep;
 199         uint64_t id;
 200         int err;
 201
 202         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 203                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 204                                         iscsi_match_epid);
 205                 if (!dev)
 206                         break;
 207         }
 208         if (id == ISCSI_MAX_EPID) {
 209                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 210                        ISCSI_MAX_EPID - 1);
 211                 return NULL;
 212         }
 213
 214         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 215         if (!ep)
 216                 return NULL;
 217
 218         ep->id = id;
 219         ep->dev.class = &iscsi_endpoint_class;
 220         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 221         err = device_register(&ep->dev);
 222         if (err)
 223                 goto free_ep;
 224
 225         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 226         if (err)
 227                 goto unregister_dev;
 228
 229         if (dd_size)
 230                 ep->dd_data = &ep[1];
 231         return ep;
 232
 233 unregister_dev:
 234         device_unregister(&ep->dev);
 235         return NULL;
 236
 237 free_ep:
 238         kfree(ep);
 239         return NULL;
 240 }
 241 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 242
 243 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 244 {
 245         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 246         device_unregister(&ep->dev);
 247 }
 248 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 249
 250 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 251 {
 252         struct iscsi_endpoint *ep;
 253         struct device *dev;
 254
 255         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 256                                 iscsi_match_epid);
 257         if (!dev)
 258                 return NULL;
 259
 260         ep = iscsi_dev_to_endpoint(dev);
 261         /*
 262          * we can drop this now because the interface will prevent
 263          * removals and lookups from racing.
 264          */
 265         put_device(dev);
 266         return ep;
 267 }
 268 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 269
 270 /*
 271  * Interface to display network param to sysfs
 272  */
 273
 274 static void iscsi_iface_release(struct device *dev)
 275 {
 276         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 277         struct device *parent = iface->dev.parent;
 278
 279         kfree(iface);
 280         put_device(parent);
 281 }
 282
 283
 284 static struct class iscsi_iface_class = {
 285         .name = "iscsi_iface",
 286         .dev_release = iscsi_iface_release,
 287 };
 288
 289 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 290 struct device_attribute dev_attr_##_prefix##_##_name =          \
 291         __ATTR(_name, _mode, _show, _store)
 292
 293 /* iface attrs show */
 294 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 295 static ssize_t                                                          \
 296 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 297                      char *buf)                                         \
 298 {                                                                       \
 299         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 300         struct iscsi_transport *t = iface->transport;                   \
 301         return t->get_iface_param(iface, param_type, param, buf);       \
 302 }                                                                       \
 303
 304 #define iscsi_iface_net_attr(type, name, param)                         \
 305         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 306 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 307
 308 #define iscsi_iface_attr(type, name, param)                             \
 309         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 310 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 311
 312 /* generic read only ipv4 attribute */
 313 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 314 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 315 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 316 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 317 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 318                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 319 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 320                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 321 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 322 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 323 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 324                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 325 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 326                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 327 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 328                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 329 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 330                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 331 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 332                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 333 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 334                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 335 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 336                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 337 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 338                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 339 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 340                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 341 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 342
 343 /* generic read only ipv6 attribute */
 344 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 345 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 346                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 347 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 348 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 349                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 350 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 351                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 352 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 353                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 354 iscsi_iface_net_attr(ipv6_iface, router_state,
 355                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 356 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 357                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 358 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 359 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 360 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 361                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 362 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 363 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 364                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 365 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 366                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 367 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 368                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 369 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 370                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 371 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 372                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 373
 374 /* common read only iface attribute */
 375 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 376 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 377 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 378 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 379 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 380 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 381 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 382 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 383 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 384                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 385 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 386 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 387 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 388 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 389 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 390 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 391
 392 /* common iscsi specific settings attributes */
 393 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 394 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 395 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 396 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 397 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 398 iscsi_iface_attr(iface, data_seq_in_order,
 399                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 400 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 401 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 402 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 403 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 404 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 405 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 406 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 407 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 408 iscsi_iface_attr(iface, discovery_auth_optional,
 409                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 410 iscsi_iface_attr(iface, discovery_logout,
 411                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 412 iscsi_iface_attr(iface, strict_login_comp_en,
 413                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 414 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 415
 416 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 417                                           struct attribute *attr, int i)
 418 {
 419         struct device *dev = container_of(kobj, struct device, kobj);
 420         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 421         struct iscsi_transport *t = iface->transport;
 422         int param;
 423         int param_type;
 424
 425         if (attr == &dev_attr_iface_enabled.attr)
 426                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 427         else if (attr == &dev_attr_iface_vlan_id.attr)
 428                 param = ISCSI_NET_PARAM_VLAN_ID;
 429         else if (attr == &dev_attr_iface_vlan_priority.attr)
 430                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 431         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 432                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 433         else if (attr == &dev_attr_iface_mtu.attr)
 434                 param = ISCSI_NET_PARAM_MTU;
 435         else if (attr == &dev_attr_iface_port.attr)
 436                 param = ISCSI_NET_PARAM_PORT;
 437         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 438                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 439         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 440                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 441         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 442                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 443         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 444                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 445         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 446                 param = ISCSI_NET_PARAM_TCP_WSF;
 447         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 448                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 449         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 450                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 451         else if (attr == &dev_attr_iface_cache_id.attr)
 452                 param = ISCSI_NET_PARAM_CACHE_ID;
 453         else if (attr == &dev_attr_iface_redirect_en.attr)
 454                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 455         else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 456                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 457         else if (attr == &dev_attr_iface_header_digest.attr)
 458                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 459         else if (attr == &dev_attr_iface_data_digest.attr)
 460                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 461         else if (attr == &dev_attr_iface_immediate_data.attr)
 462                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 463         else if (attr == &dev_attr_iface_initial_r2t.attr)
 464                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 465         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 466                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 467         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 468                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 469         else if (attr == &dev_attr_iface_erl.attr)
 470                 param = ISCSI_IFACE_PARAM_ERL;
 471         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 472                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 473         else if (attr == &dev_attr_iface_first_burst_len.attr)
 474                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 475         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 476                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 477         else if (attr == &dev_attr_iface_max_burst_len.attr)
 478                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 479         else if (attr == &dev_attr_iface_chap_auth.attr)
 480                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 481         else if (attr == &dev_attr_iface_bidi_chap.attr)
 482                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 483         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 484                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 485         else if (attr == &dev_attr_iface_discovery_logout.attr)
 486                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 487         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 488                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 489         else if (attr == &dev_attr_iface_initiator_name.attr)
 490                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 491         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 492                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 493                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 494                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 495                         param = ISCSI_NET_PARAM_IPV4_GW;
 496                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 497                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 498                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 499                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 500                 else if (attr ==
 501                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 502                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 503                 else if (attr ==
 504                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 505                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 506                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 507                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 508                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 509                         param = ISCSI_NET_PARAM_IPV4_TOS;
 510                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 511                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 512                 else if (attr ==
 513                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 514                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 515                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 517                 else if (attr ==
 518                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 519                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 520                 else if (attr ==
 521                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 522                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 523                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 524                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 525                 else if (attr ==
 526                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 527                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 528                 else if (attr ==
 529                          &dev_attr_ipv4_iface_fragment_disable.attr)
 530                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 531                 else if (attr ==
 532                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 533                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 534                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 535                         param = ISCSI_NET_PARAM_IPV4_TTL;
 536                 else
 537                         return 0;
 538         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 539                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 540                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 541                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 542                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 543                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 544                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 545                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 546                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 547                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 548                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 549                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 550                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 551                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 552                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 553                 else if (attr ==
 554                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 555                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 556                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 557                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 558                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 559                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 560                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 561                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 562                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 563                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 564                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 565                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 566                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 567                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 568                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 569                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 570                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 571                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 572                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 573                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 574                 else
 575                         return 0;
 576         } else {
 577                 WARN_ONCE(1, "Invalid iface attr");
 578                 return 0;
 579         }
 580
 581         switch (param) {
 582         case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
 583         case ISCSI_IFACE_PARAM_HDRDGST_EN:
 584         case ISCSI_IFACE_PARAM_DATADGST_EN:
 585         case ISCSI_IFACE_PARAM_IMM_DATA_EN:
 586         case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
 587         case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
 588         case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
 589         case ISCSI_IFACE_PARAM_ERL:
 590         case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
 591         case ISCSI_IFACE_PARAM_FIRST_BURST:
 592         case ISCSI_IFACE_PARAM_MAX_R2T:
 593         case ISCSI_IFACE_PARAM_MAX_BURST:
 594         case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
 595         case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
 596         case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
 597         case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
 598         case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
 599         case ISCSI_IFACE_PARAM_INITIATOR_NAME:
 600                 param_type = ISCSI_IFACE_PARAM;
 601                 break;
 602         default:
 603                 param_type = ISCSI_NET_PARAM;
 604         }
 605
 606         return t->attr_is_visible(param_type, param);
 607 }
 608
 609 static struct attribute *iscsi_iface_attrs[] = {
 610         &dev_attr_iface_enabled.attr,
 611         &dev_attr_iface_vlan_id.attr,
 612         &dev_attr_iface_vlan_priority.attr,
 613         &dev_attr_iface_vlan_enabled.attr,
 614         &dev_attr_ipv4_iface_ipaddress.attr,
 615         &dev_attr_ipv4_iface_gateway.attr,
 616         &dev_attr_ipv4_iface_subnet.attr,
 617         &dev_attr_ipv4_iface_bootproto.attr,
 618         &dev_attr_ipv6_iface_ipaddress.attr,
 619         &dev_attr_ipv6_iface_link_local_addr.attr,
 620         &dev_attr_ipv6_iface_router_addr.attr,
 621         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 622         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 623         &dev_attr_iface_mtu.attr,
 624         &dev_attr_iface_port.attr,
 625         &dev_attr_iface_ipaddress_state.attr,
 626         &dev_attr_iface_delayed_ack_en.attr,
 627         &dev_attr_iface_tcp_nagle_disable.attr,
 628         &dev_attr_iface_tcp_wsf_disable.attr,
 629         &dev_attr_iface_tcp_wsf.attr,
 630         &dev_attr_iface_tcp_timer_scale.attr,
 631         &dev_attr_iface_tcp_timestamp_en.attr,
 632         &dev_attr_iface_cache_id.attr,
 633         &dev_attr_iface_redirect_en.attr,
 634         &dev_attr_iface_def_taskmgmt_tmo.attr,
 635         &dev_attr_iface_header_digest.attr,
 636         &dev_attr_iface_data_digest.attr,
 637         &dev_attr_iface_immediate_data.attr,
 638         &dev_attr_iface_initial_r2t.attr,
 639         &dev_attr_iface_data_seq_in_order.attr,
 640         &dev_attr_iface_data_pdu_in_order.attr,
 641         &dev_attr_iface_erl.attr,
 642         &dev_attr_iface_max_recv_dlength.attr,
 643         &dev_attr_iface_first_burst_len.attr,
 644         &dev_attr_iface_max_outstanding_r2t.attr,
 645         &dev_attr_iface_max_burst_len.attr,
 646         &dev_attr_iface_chap_auth.attr,
 647         &dev_attr_iface_bidi_chap.attr,
 648         &dev_attr_iface_discovery_auth_optional.attr,
 649         &dev_attr_iface_discovery_logout.attr,
 650         &dev_attr_iface_strict_login_comp_en.attr,
 651         &dev_attr_iface_initiator_name.attr,
 652         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 653         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 654         &dev_attr_ipv4_iface_tos_en.attr,
 655         &dev_attr_ipv4_iface_tos.attr,
 656         &dev_attr_ipv4_iface_grat_arp_en.attr,
 657         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 658         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 659         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 660         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 661         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 662         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 663         &dev_attr_ipv4_iface_fragment_disable.attr,
 664         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 665         &dev_attr_ipv4_iface_ttl.attr,
 666         &dev_attr_ipv6_iface_link_local_state.attr,
 667         &dev_attr_ipv6_iface_router_state.attr,
 668         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 669         &dev_attr_ipv6_iface_mld_en.attr,
 670         &dev_attr_ipv6_iface_flow_label.attr,
 671         &dev_attr_ipv6_iface_traffic_class.attr,
 672         &dev_attr_ipv6_iface_hop_limit.attr,
 673         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 674         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 675         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 676         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 677         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 678         NULL,
 679 };
 680
 681 static struct attribute_group iscsi_iface_group = {
 682         .attrs = iscsi_iface_attrs,
 683         .is_visible = iscsi_iface_attr_is_visible,
 684 };
 685
 686 /* convert iscsi_ipaddress_state values to ascii string name */
 687 static const struct {
 688         enum iscsi_ipaddress_state      value;
 689         char                            *name;
 690 } iscsi_ipaddress_state_names[] = {
 691         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 692         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 693         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 694         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 695         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 696         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 697         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 698 };
 699
 700 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 701 {
 702         int i;
 703         char *state = NULL;
 704
 705         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 706                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 707                         state = iscsi_ipaddress_state_names[i].name;
 708                         break;
 709                 }
 710         }
 711         return state;
 712 }
 713 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 714
 715 /* convert iscsi_router_state values to ascii string name */
 716 static const struct {
 717         enum iscsi_router_state value;
 718         char                    *name;
 719 } iscsi_router_state_names[] = {
 720         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 721         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 722         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 723         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 724 };
 725
 726 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 727 {
 728         int i;
 729         char *state = NULL;
 730
 731         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 732                 if (iscsi_router_state_names[i].value == router_state) {
 733                         state = iscsi_router_state_names[i].name;
 734                         break;
 735                 }
 736         }
 737         return state;
 738 }
 739 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 740
 741 struct iscsi_iface *
 742 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 743                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 744 {
 745         struct iscsi_iface *iface;
 746         int err;
 747
 748         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 749         if (!iface)
 750                 return NULL;
 751
 752         iface->transport = transport;
 753         iface->iface_type = iface_type;
 754         iface->iface_num = iface_num;
 755         iface->dev.release = iscsi_iface_release;
 756         iface->dev.class = &iscsi_iface_class;
 757         /* parent reference released in iscsi_iface_release */
 758         iface->dev.parent = get_device(&shost->shost_gendev);
 759         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 760                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 761                              iface_num);
 762         else
 763                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 764                              iface_num);
 765
 766         err = device_register(&iface->dev);
 767         if (err)
 768                 goto free_iface;
 769
 770         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 771         if (err)
 772                 goto unreg_iface;
 773
 774         if (dd_size)
 775                 iface->dd_data = &iface[1];
 776         return iface;
 777
 778 unreg_iface:
 779         device_unregister(&iface->dev);
 780         return NULL;
 781
 782 free_iface:
 783         put_device(iface->dev.parent);
 784         kfree(iface);
 785         return NULL;
 786 }
 787 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 788
 789 void iscsi_destroy_iface(struct iscsi_iface *iface)
 790 {
 791         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 792         device_unregister(&iface->dev);
 793 }
 794 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 795
 796 /*
 797  * Interface to display flash node params to sysfs
 798  */
 799
 800 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 801 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 802         __ATTR(_name, _mode, _show, _store)
 803
 804 /* flash node session attrs show */
 805 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 806 static ssize_t                                                          \
 807 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 808                      char *buf)                                         \
 809 {                                                                       \
 810         struct iscsi_bus_flash_session *fnode_sess =                    \
 811                                         iscsi_dev_to_flash_session(dev);\
 812         struct iscsi_transport *t = fnode_sess->transport;              \
 813         return t->get_flashnode_param(fnode_sess, param, buf);          \
 814 }                                                                       \
 815
 816
 817 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 818         iscsi_flashnode_sess_attr_show(type, name, param)               \
 819 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 820                             show_##type##_##name, NULL);
 821
 822 /* Flash node session attributes */
 823
 824 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 825                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 826 iscsi_flashnode_sess_attr(fnode, discovery_session,
 827                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 828 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 829 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 830 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 831 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 832 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 833                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 834 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 835                           ISCSI_FLASHNODE_PDU_INORDER);
 836 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 837 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 838                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 839 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 840 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 841                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 842 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 843 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 844 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 845 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 846                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 847 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 848 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 849 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 850 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 851 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 852                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 853 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 854 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 855 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 856 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 857                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 858 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 859                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 860 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 861 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 862 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 863 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 864 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 865 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 866 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 867
 868 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 869         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 870         &dev_attr_fnode_discovery_session.attr,
 871         &dev_attr_fnode_portal_type.attr,
 872         &dev_attr_fnode_entry_enable.attr,
 873         &dev_attr_fnode_immediate_data.attr,
 874         &dev_attr_fnode_initial_r2t.attr,
 875         &dev_attr_fnode_data_seq_in_order.attr,
 876         &dev_attr_fnode_data_pdu_in_order.attr,
 877         &dev_attr_fnode_chap_auth.attr,
 878         &dev_attr_fnode_discovery_logout.attr,
 879         &dev_attr_fnode_bidi_chap.attr,
 880         &dev_attr_fnode_discovery_auth_optional.attr,
 881         &dev_attr_fnode_erl.attr,
 882         &dev_attr_fnode_first_burst_len.attr,
 883         &dev_attr_fnode_def_time2wait.attr,
 884         &dev_attr_fnode_def_time2retain.attr,
 885         &dev_attr_fnode_max_outstanding_r2t.attr,
 886         &dev_attr_fnode_isid.attr,
 887         &dev_attr_fnode_tsid.attr,
 888         &dev_attr_fnode_max_burst_len.attr,
 889         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 890         &dev_attr_fnode_targetalias.attr,
 891         &dev_attr_fnode_targetname.attr,
 892         &dev_attr_fnode_tpgt.attr,
 893         &dev_attr_fnode_discovery_parent_idx.attr,
 894         &dev_attr_fnode_discovery_parent_type.attr,
 895         &dev_attr_fnode_chap_in_idx.attr,
 896         &dev_attr_fnode_chap_out_idx.attr,
 897         &dev_attr_fnode_username.attr,
 898         &dev_attr_fnode_username_in.attr,
 899         &dev_attr_fnode_password.attr,
 900         &dev_attr_fnode_password_in.attr,
 901         &dev_attr_fnode_is_boot_target.attr,
 902         NULL,
 903 };
 904
 905 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 906                                                     struct attribute *attr,
 907                                                     int i)
 908 {
 909         struct device *dev = container_of(kobj, struct device, kobj);
 910         struct iscsi_bus_flash_session *fnode_sess =
 911                                                 iscsi_dev_to_flash_session(dev);
 912         struct iscsi_transport *t = fnode_sess->transport;
 913         int param;
 914
 915         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 916                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 917         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 918                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 919         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 920                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 921         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 922                 param = ISCSI_FLASHNODE_ENTRY_EN;
 923         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 924                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 925         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 926                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 927         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 928                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 929         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 930                 param = ISCSI_FLASHNODE_PDU_INORDER;
 931         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 932                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 933         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 934                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 935         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 936                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 937         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 938                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 939         } else if (attr == &dev_attr_fnode_erl.attr) {
 940                 param = ISCSI_FLASHNODE_ERL;
 941         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 942                 param = ISCSI_FLASHNODE_FIRST_BURST;
 943         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 944                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 945         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 946                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 947         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 948                 param = ISCSI_FLASHNODE_MAX_R2T;
 949         } else if (attr == &dev_attr_fnode_isid.attr) {
 950                 param = ISCSI_FLASHNODE_ISID;
 951         } else if (attr == &dev_attr_fnode_tsid.attr) {
 952                 param = ISCSI_FLASHNODE_TSID;
 953         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 954                 param = ISCSI_FLASHNODE_MAX_BURST;
 955         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 956                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 957         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 958                 param = ISCSI_FLASHNODE_ALIAS;
 959         } else if (attr == &dev_attr_fnode_targetname.attr) {
 960                 param = ISCSI_FLASHNODE_NAME;
 961         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 962                 param = ISCSI_FLASHNODE_TPGT;
 963         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 964                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 965         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 966                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 967         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 968                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 969         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 970                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 971         } else if (attr == &dev_attr_fnode_username.attr) {
 972                 param = ISCSI_FLASHNODE_USERNAME;
 973         } else if (attr == &dev_attr_fnode_username_in.attr) {
 974                 param = ISCSI_FLASHNODE_USERNAME_IN;
 975         } else if (attr == &dev_attr_fnode_password.attr) {
 976                 param = ISCSI_FLASHNODE_PASSWORD;
 977         } else if (attr == &dev_attr_fnode_password_in.attr) {
 978                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 979         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 980                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 981         } else {
 982                 WARN_ONCE(1, "Invalid flashnode session attr");
 983                 return 0;
 984         }
 985
 986         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 987 }
 988
 989 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 990         .attrs = iscsi_flashnode_sess_attrs,
 991         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 992 };
 993
 994 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 995         &iscsi_flashnode_sess_attr_group,
 996         NULL,
 997 };
 998
 999 static void iscsi_flashnode_sess_release(struct device *dev)
1000 {
1001         struct iscsi_bus_flash_session *fnode_sess =
1002                                                 iscsi_dev_to_flash_session(dev);
1003
1004         kfree(fnode_sess->targetname);
1005         kfree(fnode_sess->targetalias);
1006         kfree(fnode_sess->portal_type);
1007         kfree(fnode_sess);
1008 }
1009
1010 struct device_type iscsi_flashnode_sess_dev_type = {
1011         .name = "iscsi_flashnode_sess_dev_type",
1012         .groups = iscsi_flashnode_sess_attr_groups,
1013         .release = iscsi_flashnode_sess_release,
1014 };
1015
1016 /* flash node connection attrs show */
1017 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1018 static ssize_t                                                          \
1019 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1020                      char *buf)                                         \
1021 {                                                                       \
1022         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1023         struct iscsi_bus_flash_session *fnode_sess =                    \
1024                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1025         struct iscsi_transport *t = fnode_conn->transport;              \
1026         return t->get_flashnode_param(fnode_sess, param, buf);          \
1027 }                                                                       \
1028
1029
1030 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1031         iscsi_flashnode_conn_attr_show(type, name, param)               \
1032 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1033                             show_##type##_##name, NULL);
1034
1035 /* Flash node connection attributes */
1036
1037 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1038                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1039 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1040 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1041 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1042 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1043                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1044 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1045                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1046 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1047                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1049                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1050 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1051                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1052 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1053                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1054 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1055 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1056 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1057 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1058                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1059 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1060                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1061 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1062 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1063 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1064 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1065                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1066 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1067                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1068 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1069                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1070 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1071                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1072 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1073 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1074 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1075 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1076
1077 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1078         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1079         &dev_attr_fnode_header_digest.attr,
1080         &dev_attr_fnode_data_digest.attr,
1081         &dev_attr_fnode_snack_req.attr,
1082         &dev_attr_fnode_tcp_timestamp_stat.attr,
1083         &dev_attr_fnode_tcp_nagle_disable.attr,
1084         &dev_attr_fnode_tcp_wsf_disable.attr,
1085         &dev_attr_fnode_tcp_timer_scale.attr,
1086         &dev_attr_fnode_tcp_timestamp_enable.attr,
1087         &dev_attr_fnode_fragment_disable.attr,
1088         &dev_attr_fnode_max_recv_dlength.attr,
1089         &dev_attr_fnode_max_xmit_dlength.attr,
1090         &dev_attr_fnode_keepalive_tmo.attr,
1091         &dev_attr_fnode_port.attr,
1092         &dev_attr_fnode_ipaddress.attr,
1093         &dev_attr_fnode_redirect_ipaddr.attr,
1094         &dev_attr_fnode_max_segment_size.attr,
1095         &dev_attr_fnode_local_port.attr,
1096         &dev_attr_fnode_ipv4_tos.attr,
1097         &dev_attr_fnode_ipv6_traffic_class.attr,
1098         &dev_attr_fnode_ipv6_flow_label.attr,
1099         &dev_attr_fnode_link_local_ipv6.attr,
1100         &dev_attr_fnode_tcp_xmit_wsf.attr,
1101         &dev_attr_fnode_tcp_recv_wsf.attr,
1102         &dev_attr_fnode_statsn.attr,
1103         &dev_attr_fnode_exp_statsn.attr,
1104         NULL,
1105 };
1106
1107 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1108                                                     struct attribute *attr,
1109                                                     int i)
1110 {
1111         struct device *dev = container_of(kobj, struct device, kobj);
1112         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1113         struct iscsi_transport *t = fnode_conn->transport;
1114         int param;
1115
1116         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1117                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1118         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1119                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1120         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1121                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1122         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1123                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1124         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1125                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1126         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1127                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1128         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1129                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1130         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1131                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1132         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1133                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1134         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1135                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1136         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1137                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1138         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1139                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1140         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1141                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1142         } else if (attr == &dev_attr_fnode_port.attr) {
1143                 param = ISCSI_FLASHNODE_PORT;
1144         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1145                 param = ISCSI_FLASHNODE_IPADDR;
1146         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1147                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1148         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1149                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1150         } else if (attr == &dev_attr_fnode_local_port.attr) {
1151                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1152         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1153                 param = ISCSI_FLASHNODE_IPV4_TOS;
1154         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1155                 param = ISCSI_FLASHNODE_IPV6_TC;
1156         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1157                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1158         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1159                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1160         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1161                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1162         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1163                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1164         } else if (attr == &dev_attr_fnode_statsn.attr) {
1165                 param = ISCSI_FLASHNODE_STATSN;
1166         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1167                 param = ISCSI_FLASHNODE_EXP_STATSN;
1168         } else {
1169                 WARN_ONCE(1, "Invalid flashnode connection attr");
1170                 return 0;
1171         }
1172
1173         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1174 }
1175
1176 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1177         .attrs = iscsi_flashnode_conn_attrs,
1178         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1179 };
1180
1181 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1182         &iscsi_flashnode_conn_attr_group,
1183         NULL,
1184 };
1185
1186 static void iscsi_flashnode_conn_release(struct device *dev)
1187 {
1188         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1189
1190         kfree(fnode_conn->ipaddress);
1191         kfree(fnode_conn->redirect_ipaddr);
1192         kfree(fnode_conn->link_local_ipv6_addr);
1193         kfree(fnode_conn);
1194 }
1195
1196 struct device_type iscsi_flashnode_conn_dev_type = {
1197         .name = "iscsi_flashnode_conn_dev_type",
1198         .groups = iscsi_flashnode_conn_attr_groups,
1199         .release = iscsi_flashnode_conn_release,
1200 };
1201
1202 struct bus_type iscsi_flashnode_bus;
1203
1204 int iscsi_flashnode_bus_match(struct device *dev,
1205                                      struct device_driver *drv)
1206 {
1207         if (dev->bus == &iscsi_flashnode_bus)
1208                 return 1;
1209         return 0;
1210 }
1211 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1212
1213 struct bus_type iscsi_flashnode_bus = {
1214         .name = "iscsi_flashnode",
1215         .match = &iscsi_flashnode_bus_match,
1216 };
1217
1218 /**
1219  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1220  * @shost: pointer to host data
1221  * @index: index of flashnode to add in sysfs
1222  * @transport: pointer to transport data
1223  * @dd_size: total size to allocate
1224  *
1225  * Adds a sysfs entry for the flashnode session attributes
1226  *
1227  * Returns:
1228  *  pointer to allocated flashnode sess on success
1229  *  %NULL on failure
1230  */
1231 struct iscsi_bus_flash_session *
1232 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1233                             struct iscsi_transport *transport,
1234                             int dd_size)
1235 {
1236         struct iscsi_bus_flash_session *fnode_sess;
1237         int err;
1238
1239         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1240         if (!fnode_sess)
1241                 return NULL;
1242
1243         fnode_sess->transport = transport;
1244         fnode_sess->target_id = index;
1245         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1246         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1247         fnode_sess->dev.parent = &shost->shost_gendev;
1248         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1249                      shost->host_no, index);
1250
1251         err = device_register(&fnode_sess->dev);
1252         if (err)
1253                 goto free_fnode_sess;
1254
1255         if (dd_size)
1256                 fnode_sess->dd_data = &fnode_sess[1];
1257
1258         return fnode_sess;
1259
1260 free_fnode_sess:
1261         kfree(fnode_sess);
1262         return NULL;
1263 }
1264 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1265
1266 /**
1267  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1268  * @shost: pointer to host data
1269  * @fnode_sess: pointer to the parent flashnode session entry
1270  * @transport: pointer to transport data
1271  * @dd_size: total size to allocate
1272  *
1273  * Adds a sysfs entry for the flashnode connection attributes
1274  *
1275  * Returns:
1276  *  pointer to allocated flashnode conn on success
1277  *  %NULL on failure
1278  */
1279 struct iscsi_bus_flash_conn *
1280 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1281                             struct iscsi_bus_flash_session *fnode_sess,
1282                             struct iscsi_transport *transport,
1283                             int dd_size)
1284 {
1285         struct iscsi_bus_flash_conn *fnode_conn;
1286         int err;
1287
1288         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1289         if (!fnode_conn)
1290                 return NULL;
1291
1292         fnode_conn->transport = transport;
1293         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1294         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1295         fnode_conn->dev.parent = &fnode_sess->dev;
1296         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1297                      shost->host_no, fnode_sess->target_id);
1298
1299         err = device_register(&fnode_conn->dev);
1300         if (err)
1301                 goto free_fnode_conn;
1302
1303         if (dd_size)
1304                 fnode_conn->dd_data = &fnode_conn[1];
1305
1306         return fnode_conn;
1307
1308 free_fnode_conn:
1309         kfree(fnode_conn);
1310         return NULL;
1311 }
1312 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1313
1314 /**
1315  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1316  * @dev: device to verify
1317  * @data: pointer to data containing value to use for verification
1318  *
1319  * Verifies if the passed device is flashnode conn device
1320  *
1321  * Returns:
1322  *  1 on success
1323  *  0 on failure
1324  */
1325 int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1326 {
1327         return dev->bus == &iscsi_flashnode_bus;
1328 }
1329 EXPORT_SYMBOL_GPL(iscsi_is_flashnode_conn_dev);
1330
1331 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1332 {
1333         device_unregister(&fnode_conn->dev);
1334         return 0;
1335 }
1336
1337 static int flashnode_match_index(struct device *dev, void *data)
1338 {
1339         struct iscsi_bus_flash_session *fnode_sess = NULL;
1340         int ret = 0;
1341
1342         if (!iscsi_flashnode_bus_match(dev, NULL))
1343                 goto exit_match_index;
1344
1345         fnode_sess = iscsi_dev_to_flash_session(dev);
1346         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1347
1348 exit_match_index:
1349         return ret;
1350 }
1351
1352 /**
1353  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1354  * @shost: pointer to host data
1355  * @idx: index to match
1356  *
1357  * Finds the flashnode session object for the passed index
1358  *
1359  * Returns:
1360  *  pointer to found flashnode session object on success
1361  *  %NULL on failure
1362  */
1363 static struct iscsi_bus_flash_session *
1364 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1365 {
1366         struct iscsi_bus_flash_session *fnode_sess = NULL;
1367         struct device *dev;
1368
1369         dev = device_find_child(&shost->shost_gendev, &idx,
1370                                 flashnode_match_index);
1371         if (dev)
1372                 fnode_sess = iscsi_dev_to_flash_session(dev);
1373
1374         return fnode_sess;
1375 }
1376
1377 /**
1378  * iscsi_find_flashnode_sess - finds flashnode session entry
1379  * @shost: pointer to host data
1380  * @data: pointer to data containing value to use for comparison
1381  * @fn: function pointer that does actual comparison
1382  *
1383  * Finds the flashnode session object comparing the data passed using logic
1384  * defined in passed function pointer
1385  *
1386  * Returns:
1387  *  pointer to found flashnode session device object on success
1388  *  %NULL on failure
1389  */
1390 struct device *
1391 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1392                           int (*fn)(struct device *dev, void *data))
1393 {
1394         return device_find_child(&shost->shost_gendev, data, fn);
1395 }
1396 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1397
1398 /**
1399  * iscsi_find_flashnode_conn - finds flashnode connection entry
1400  * @fnode_sess: pointer to parent flashnode session entry
1401  *
1402  * Finds the flashnode connection object comparing the data passed using logic
1403  * defined in passed function pointer
1404  *
1405  * Returns:
1406  *  pointer to found flashnode connection device object on success
1407  *  %NULL on failure
1408  */
1409 struct device *
1410 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1411 {
1412         return device_find_child(&fnode_sess->dev, NULL,
1413                                  iscsi_is_flashnode_conn_dev);
1414 }
1415 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1416
1417 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1418 {
1419         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1420                 return 0;
1421
1422         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1423 }
1424
1425 /**
1426  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1427  * @fnode_sess: pointer to flashnode session entry to be destroyed
1428  *
1429  * Deletes the flashnode session entry and all children flashnode connection
1430  * entries from sysfs
1431  */
1432 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1433 {
1434         int err;
1435
1436         err = device_for_each_child(&fnode_sess->dev, NULL,
1437                                     iscsi_iter_destroy_flashnode_conn_fn);
1438         if (err)
1439                 pr_err("Could not delete all connections for %s. Error %d.\n",
1440                        fnode_sess->dev.kobj.name, err);
1441
1442         device_unregister(&fnode_sess->dev);
1443 }
1444 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1445
1446 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1447 {
1448         if (!iscsi_flashnode_bus_match(dev, NULL))
1449                 return 0;
1450
1451         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1452         return 0;
1453 }
1454
1455 /**
1456  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1457  * @shost: pointer to host data
1458  *
1459  * Destroys all the flashnode session entries and all corresponding children
1460  * flashnode connection entries from sysfs
1461  */
1462 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1463 {
1464         device_for_each_child(&shost->shost_gendev, NULL,
1465                               iscsi_iter_destroy_flashnode_fn);
1466 }
1467 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1468
1469 /*
1470  * BSG support
1471  */
1472 /**
1473  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1474  * @job: bsg job to be processed
1475  */
1476 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1477 {
1478         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1479         struct iscsi_bsg_request *req = job->request;
1480         struct iscsi_bsg_reply *reply = job->reply;
1481         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1482         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1483         int ret;
1484
1485         /* check if we have the msgcode value at least */
1486         if (job->request_len < sizeof(uint32_t)) {
1487                 ret = -ENOMSG;
1488                 goto fail_host_msg;
1489         }
1490
1491         /* Validate the host command */
1492         switch (req->msgcode) {
1493         case ISCSI_BSG_HST_VENDOR:
1494                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1495                 if ((shost->hostt->vendor_id == 0L) ||
1496                     (req->rqst_data.h_vendor.vendor_id !=
1497                         shost->hostt->vendor_id)) {
1498                         ret = -ESRCH;
1499                         goto fail_host_msg;
1500                 }
1501                 break;
1502         default:
1503                 ret = -EBADR;
1504                 goto fail_host_msg;
1505         }
1506
1507         /* check if we really have all the request data needed */
1508         if (job->request_len < cmdlen) {
1509                 ret = -ENOMSG;
1510                 goto fail_host_msg;
1511         }
1512
1513         ret = i->iscsi_transport->bsg_request(job);
1514         if (!ret)
1515                 return 0;
1516
1517 fail_host_msg:
1518         /* return the errno failure code as the only status */
1519         BUG_ON(job->reply_len < sizeof(uint32_t));
1520         reply->reply_payload_rcv_len = 0;
1521         reply->result = ret;
1522         job->reply_len = sizeof(uint32_t);
1523         bsg_job_done(job, ret, 0);
1524         return 0;
1525 }
1526
1527 /**
1528  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1529  * @shost: shost for iscsi_host
1530  * @ihost: iscsi_cls_host adding the structures to
1531  */
1532 static int
1533 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1534 {
1535         struct device *dev = &shost->shost_gendev;
1536         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1537         struct request_queue *q;
1538         char bsg_name[20];
1539         int ret;
1540
1541         if (!i->iscsi_transport->bsg_request)
1542                 return -ENOTSUPP;
1543
1544         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1545
1546         q = __scsi_alloc_queue(shost, bsg_request_fn);
1547         if (!q)
1548                 return -ENOMEM;
1549
1550         ret = bsg_setup_queue(dev, q, bsg_name, iscsi_bsg_host_dispatch, 0);
1551         if (ret) {
1552                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1553                              "initialize - no request queue\n");
1554                 blk_cleanup_queue(q);
1555                 return ret;
1556         }
1557
1558         ihost->bsg_q = q;
1559         return 0;
1560 }
1561
1562 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1563                             struct device *cdev)
1564 {
1565         struct Scsi_Host *shost = dev_to_shost(dev);
1566         struct iscsi_cls_host *ihost = shost->shost_data;
1567
1568         memset(ihost, 0, sizeof(*ihost));
1569         atomic_set(&ihost->nr_scans, 0);
1570         mutex_init(&ihost->mutex);
1571
1572         iscsi_bsg_host_add(shost, ihost);
1573         /* ignore any bsg add error - we just can't do sgio */
1574
1575         return 0;
1576 }
1577
1578 static int iscsi_remove_host(struct transport_container *tc,
1579                              struct device *dev, struct device *cdev)
1580 {
1581         struct Scsi_Host *shost = dev_to_shost(dev);
1582         struct iscsi_cls_host *ihost = shost->shost_data;
1583
1584         if (ihost->bsg_q) {
1585                 bsg_unregister_queue(ihost->bsg_q);
1586                 blk_cleanup_queue(ihost->bsg_q);
1587         }
1588         return 0;
1589 }
1590
1591 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1592                                "iscsi_host",
1593                                iscsi_setup_host,
1594                                iscsi_remove_host,
1595                                NULL);
1596
1597 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1598                                "iscsi_session",
1599                                NULL,
1600                                NULL,
1601                                NULL);
1602
1603 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1604                                "iscsi_connection",
1605                                NULL,
1606                                NULL,
1607                                NULL);
1608
1609 static struct sock *nls;
1610 static DEFINE_MUTEX(rx_queue_mutex);
1611
1612 static LIST_HEAD(sesslist);
1613 static DEFINE_SPINLOCK(sesslock);
1614 static LIST_HEAD(connlist);
1615 static DEFINE_SPINLOCK(connlock);
1616
1617 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1618 {
1619         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1620         return sess->sid;
1621 }
1622
1623 /*
1624  * Returns the matching session to a given sid
1625  */
1626 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1627 {
1628         unsigned long flags;
1629         struct iscsi_cls_session *sess;
1630
1631         spin_lock_irqsave(&sesslock, flags);
1632         list_for_each_entry(sess, &sesslist, sess_list) {
1633                 if (sess->sid == sid) {
1634                         spin_unlock_irqrestore(&sesslock, flags);
1635                         return sess;
1636                 }
1637         }
1638         spin_unlock_irqrestore(&sesslock, flags);
1639         return NULL;
1640 }
1641
1642 /*
1643  * Returns the matching connection to a given sid / cid tuple
1644  */
1645 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1646 {
1647         unsigned long flags;
1648         struct iscsi_cls_conn *conn;
1649
1650         spin_lock_irqsave(&connlock, flags);
1651         list_for_each_entry(conn, &connlist, conn_list) {
1652                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1653                         spin_unlock_irqrestore(&connlock, flags);
1654                         return conn;
1655                 }
1656         }
1657         spin_unlock_irqrestore(&connlock, flags);
1658         return NULL;
1659 }
1660
1661 /*
1662  * The following functions can be used by LLDs that allocate
1663  * their own scsi_hosts or by software iscsi LLDs
1664  */
1665 static struct {
1666         int value;
1667         char *name;
1668 } iscsi_session_state_names[] = {
1669         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1670         { ISCSI_SESSION_FAILED,         "FAILED" },
1671         { ISCSI_SESSION_FREE,           "FREE" },
1672 };
1673
1674 static const char *iscsi_session_state_name(int state)
1675 {
1676         int i;
1677         char *name = NULL;
1678
1679         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1680                 if (iscsi_session_state_names[i].value == state) {
1681                         name = iscsi_session_state_names[i].name;
1682                         break;
1683                 }
1684         }
1685         return name;
1686 }
1687
1688 int iscsi_session_chkready(struct iscsi_cls_session *session)
1689 {
1690         unsigned long flags;
1691         int err;
1692
1693         spin_lock_irqsave(&session->lock, flags);
1694         switch (session->state) {
1695         case ISCSI_SESSION_LOGGED_IN:
1696                 err = 0;
1697                 break;
1698         case ISCSI_SESSION_FAILED:
1699                 err = DID_IMM_RETRY << 16;
1700                 break;
1701         case ISCSI_SESSION_FREE:
1702                 err = DID_TRANSPORT_FAILFAST << 16;
1703                 break;
1704         default:
1705                 err = DID_NO_CONNECT << 16;
1706                 break;
1707         }
1708         spin_unlock_irqrestore(&session->lock, flags);
1709         return err;
1710 }
1711 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1712
1713 int iscsi_is_session_online(struct iscsi_cls_session *session)
1714 {
1715         unsigned long flags;
1716         int ret = 0;
1717
1718         spin_lock_irqsave(&session->lock, flags);
1719         if (session->state == ISCSI_SESSION_LOGGED_IN)
1720                 ret = 1;
1721         spin_unlock_irqrestore(&session->lock, flags);
1722         return ret;
1723 }
1724 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1725
1726 static void iscsi_session_release(struct device *dev)
1727 {
1728         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1729         struct Scsi_Host *shost;
1730
1731         shost = iscsi_session_to_shost(session);
1732         scsi_host_put(shost);
1733         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1734         kfree(session);
1735 }
1736
1737 int iscsi_is_session_dev(const struct device *dev)
1738 {
1739         return dev->release == iscsi_session_release;
1740 }
1741 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1742
1743 static int iscsi_iter_session_fn(struct device *dev, void *data)
1744 {
1745         void (* fn) (struct iscsi_cls_session *) = data;
1746
1747         if (!iscsi_is_session_dev(dev))
1748                 return 0;
1749         fn(iscsi_dev_to_session(dev));
1750         return 0;
1751 }
1752
1753 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1754                                  void (*fn)(struct iscsi_cls_session *))
1755 {
1756         device_for_each_child(&shost->shost_gendev, fn,
1757                               iscsi_iter_session_fn);
1758 }
1759 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1760
1761 /**
1762  * iscsi_scan_finished - helper to report when running scans are done
1763  * @shost: scsi host
1764  * @time: scan run time
1765  *
1766  * This function can be used by drives like qla4xxx to report to the scsi
1767  * layer when the scans it kicked off at module load time are done.
1768  */
1769 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1770 {
1771         struct iscsi_cls_host *ihost = shost->shost_data;
1772         /*
1773          * qla4xxx will have kicked off some session unblocks before calling
1774          * scsi_scan_host, so just wait for them to complete.
1775          */
1776         return !atomic_read(&ihost->nr_scans);
1777 }
1778 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1779
1780 struct iscsi_scan_data {
1781         unsigned int channel;
1782         unsigned int id;
1783         u64 lun;
1784 };
1785
1786 static int iscsi_user_scan_session(struct device *dev, void *data)
1787 {
1788         struct iscsi_scan_data *scan_data = data;
1789         struct iscsi_cls_session *session;
1790         struct Scsi_Host *shost;
1791         struct iscsi_cls_host *ihost;
1792         unsigned long flags;
1793         unsigned int id;
1794
1795         if (!iscsi_is_session_dev(dev))
1796                 return 0;
1797
1798         session = iscsi_dev_to_session(dev);
1799
1800         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1801
1802         shost = iscsi_session_to_shost(session);
1803         ihost = shost->shost_data;
1804
1805         mutex_lock(&ihost->mutex);
1806         spin_lock_irqsave(&session->lock, flags);
1807         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1808                 spin_unlock_irqrestore(&session->lock, flags);
1809                 goto user_scan_exit;
1810         }
1811         id = session->target_id;
1812         spin_unlock_irqrestore(&session->lock, flags);
1813
1814         if (id != ISCSI_MAX_TARGET) {
1815                 if ((scan_data->channel == SCAN_WILD_CARD ||
1816                      scan_data->channel == 0) &&
1817                     (scan_data->id == SCAN_WILD_CARD ||
1818                      scan_data->id == id))
1819                         scsi_scan_target(&session->dev, 0, id,
1820                                          scan_data->lun, 1);
1821         }
1822
1823 user_scan_exit:
1824         mutex_unlock(&ihost->mutex);
1825         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1826         return 0;
1827 }
1828
1829 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1830                            uint id, u64 lun)
1831 {
1832         struct iscsi_scan_data scan_data;
1833
1834         scan_data.channel = channel;
1835         scan_data.id = id;
1836         scan_data.lun = lun;
1837
1838         return device_for_each_child(&shost->shost_gendev, &scan_data,
1839                                      iscsi_user_scan_session);
1840 }
1841
1842 static void iscsi_scan_session(struct work_struct *work)
1843 {
1844         struct iscsi_cls_session *session =
1845                         container_of(work, struct iscsi_cls_session, scan_work);
1846         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1847         struct iscsi_cls_host *ihost = shost->shost_data;
1848         struct iscsi_scan_data scan_data;
1849
1850         scan_data.channel = 0;
1851         scan_data.id = SCAN_WILD_CARD;
1852         scan_data.lun = SCAN_WILD_CARD;
1853
1854         iscsi_user_scan_session(&session->dev, &scan_data);
1855         atomic_dec(&ihost->nr_scans);
1856 }
1857
1858 /**
1859  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1860  * @cmd: scsi cmd passed to scsi eh handler
1861  *
1862  * If the session is down this function will wait for the recovery
1863  * timer to fire or for the session to be logged back in. If the
1864  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1865  * should pass this error value to the scsi eh.
1866  */
1867 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1868 {
1869         struct iscsi_cls_session *session =
1870                         starget_to_session(scsi_target(cmd->device));
1871         unsigned long flags;
1872         int ret = 0;
1873
1874         spin_lock_irqsave(&session->lock, flags);
1875         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1876                 if (session->state == ISCSI_SESSION_FREE) {
1877                         ret = FAST_IO_FAIL;
1878                         break;
1879                 }
1880                 spin_unlock_irqrestore(&session->lock, flags);
1881                 msleep(1000);
1882                 spin_lock_irqsave(&session->lock, flags);
1883         }
1884         spin_unlock_irqrestore(&session->lock, flags);
1885         return ret;
1886 }
1887 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1888
1889 static void session_recovery_timedout(struct work_struct *work)
1890 {
1891         struct iscsi_cls_session *session =
1892                 container_of(work, struct iscsi_cls_session,
1893                              recovery_work.work);
1894         unsigned long flags;
1895
1896         iscsi_cls_session_printk(KERN_INFO, session,
1897                                  "session recovery timed out after %d secs\n",
1898                                  session->recovery_tmo);
1899
1900         spin_lock_irqsave(&session->lock, flags);
1901         switch (session->state) {
1902         case ISCSI_SESSION_FAILED:
1903                 session->state = ISCSI_SESSION_FREE;
1904                 break;
1905         case ISCSI_SESSION_LOGGED_IN:
1906         case ISCSI_SESSION_FREE:
1907                 /* we raced with the unblock's flush */
1908                 spin_unlock_irqrestore(&session->lock, flags);
1909                 return;
1910         }
1911         spin_unlock_irqrestore(&session->lock, flags);
1912
1913         if (session->transport->session_recovery_timedout)
1914                 session->transport->session_recovery_timedout(session);
1915
1916         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1917         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1918         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1919 }
1920
1921 static void __iscsi_unblock_session(struct work_struct *work)
1922 {
1923         struct iscsi_cls_session *session =
1924                         container_of(work, struct iscsi_cls_session,
1925                                      unblock_work);
1926         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1927         struct iscsi_cls_host *ihost = shost->shost_data;
1928         unsigned long flags;
1929
1930         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1931         /*
1932          * The recovery and unblock work get run from the same workqueue,
1933          * so try to cancel it if it was going to run after this unblock.
1934          */
1935         cancel_delayed_work(&session->recovery_work);
1936         spin_lock_irqsave(&session->lock, flags);
1937         session->state = ISCSI_SESSION_LOGGED_IN;
1938         spin_unlock_irqrestore(&session->lock, flags);
1939         /* start IO */
1940         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1941         /*
1942          * Only do kernel scanning if the driver is properly hooked into
1943          * the async scanning code (drivers like iscsi_tcp do login and
1944          * scanning from userspace).
1945          */
1946         if (shost->hostt->scan_finished) {
1947                 if (scsi_queue_work(shost, &session->scan_work))
1948                         atomic_inc(&ihost->nr_scans);
1949         }
1950         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1951 }
1952
1953 /**
1954  * iscsi_unblock_session - set a session as logged in and start IO.
1955  * @session: iscsi session
1956  *
1957  * Mark a session as ready to accept IO.
1958  */
1959 void iscsi_unblock_session(struct iscsi_cls_session *session)
1960 {
1961         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1962         /*
1963          * make sure all the events have completed before tell the driver
1964          * it is safe
1965          */
1966         flush_workqueue(iscsi_eh_timer_workq);
1967 }
1968 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1969
1970 static void __iscsi_block_session(struct work_struct *work)
1971 {
1972         struct iscsi_cls_session *session =
1973                         container_of(work, struct iscsi_cls_session,
1974                                      block_work);
1975         unsigned long flags;
1976
1977         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1978         spin_lock_irqsave(&session->lock, flags);
1979         session->state = ISCSI_SESSION_FAILED;
1980         spin_unlock_irqrestore(&session->lock, flags);
1981         scsi_target_block(&session->dev);
1982         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1983         if (session->recovery_tmo >= 0)
1984                 queue_delayed_work(iscsi_eh_timer_workq,
1985                                    &session->recovery_work,
1986                                    session->recovery_tmo * HZ);
1987 }
1988
1989 void iscsi_block_session(struct iscsi_cls_session *session)
1990 {
1991         queue_work(iscsi_eh_timer_workq, &session->block_work);
1992 }
1993 EXPORT_SYMBOL_GPL(iscsi_block_session);
1994
1995 static void __iscsi_unbind_session(struct work_struct *work)
1996 {
1997         struct iscsi_cls_session *session =
1998                         container_of(work, struct iscsi_cls_session,
1999                                      unbind_work);
2000         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2001         struct iscsi_cls_host *ihost = shost->shost_data;
2002         unsigned long flags;
2003         unsigned int target_id;
2004
2005         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2006
2007         /* Prevent new scans and make sure scanning is not in progress */
2008         mutex_lock(&ihost->mutex);
2009         spin_lock_irqsave(&session->lock, flags);
2010         if (session->target_id == ISCSI_MAX_TARGET) {
2011                 spin_unlock_irqrestore(&session->lock, flags);
2012                 mutex_unlock(&ihost->mutex);
2013                 return;
2014         }
2015
2016         target_id = session->target_id;
2017         session->target_id = ISCSI_MAX_TARGET;
2018         spin_unlock_irqrestore(&session->lock, flags);
2019         mutex_unlock(&ihost->mutex);
2020
2021         if (session->ida_used)
2022                 ida_simple_remove(&iscsi_sess_ida, target_id);
2023
2024         scsi_remove_target(&session->dev);
2025         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2026         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2027 }
2028
2029 struct iscsi_cls_session *
2030 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2031                     int dd_size)
2032 {
2033         struct iscsi_cls_session *session;
2034
2035         session = kzalloc(sizeof(*session) + dd_size,
2036                           GFP_KERNEL);
2037         if (!session)
2038                 return NULL;
2039
2040         session->transport = transport;
2041         session->creator = -1;
2042         session->recovery_tmo = 120;
2043         session->state = ISCSI_SESSION_FREE;
2044         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2045         INIT_LIST_HEAD(&session->sess_list);
2046         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2047         INIT_WORK(&session->block_work, __iscsi_block_session);
2048         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2049         INIT_WORK(&session->scan_work, iscsi_scan_session);
2050         spin_lock_init(&session->lock);
2051
2052         /* this is released in the dev's release function */
2053         scsi_host_get(shost);
2054         session->dev.parent = &shost->shost_gendev;
2055         session->dev.release = iscsi_session_release;
2056         device_initialize(&session->dev);
2057         if (dd_size)
2058                 session->dd_data = &session[1];
2059
2060         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2061         return session;
2062 }
2063 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2064
2065 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2066 {
2067         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2068         struct iscsi_cls_host *ihost;
2069         unsigned long flags;
2070         int id = 0;
2071         int err;
2072
2073         ihost = shost->shost_data;
2074         session->sid = atomic_add_return(1, &iscsi_session_nr);
2075
2076         if (target_id == ISCSI_MAX_TARGET) {
2077                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2078
2079                 if (id < 0) {
2080                         iscsi_cls_session_printk(KERN_ERR, session,
2081                                         "Failure in Target ID Allocation\n");
2082                         return id;
2083                 }
2084                 session->target_id = (unsigned int)id;
2085                 session->ida_used = true;
2086         } else
2087                 session->target_id = target_id;
2088
2089         dev_set_name(&session->dev, "session%u", session->sid);
2090         err = device_add(&session->dev);
2091         if (err) {
2092                 iscsi_cls_session_printk(KERN_ERR, session,
2093                                          "could not register session's dev\n");
2094                 goto release_ida;
2095         }
2096         transport_register_device(&session->dev);
2097
2098         spin_lock_irqsave(&sesslock, flags);
2099         list_add(&session->sess_list, &sesslist);
2100         spin_unlock_irqrestore(&sesslock, flags);
2101
2102         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2103         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2104         return 0;
2105
2106 release_ida:
2107         if (session->ida_used)
2108                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2109
2110         return err;
2111 }
2112 EXPORT_SYMBOL_GPL(iscsi_add_session);
2113
2114 /**
2115  * iscsi_create_session - create iscsi class session
2116  * @shost: scsi host
2117  * @transport: iscsi transport
2118  * @dd_size: private driver data size
2119  * @target_id: which target
2120  *
2121  * This can be called from a LLD or iscsi_transport.
2122  */
2123 struct iscsi_cls_session *
2124 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2125                      int dd_size, unsigned int target_id)
2126 {
2127         struct iscsi_cls_session *session;
2128
2129         session = iscsi_alloc_session(shost, transport, dd_size);
2130         if (!session)
2131                 return NULL;
2132
2133         if (iscsi_add_session(session, target_id)) {
2134                 iscsi_free_session(session);
2135                 return NULL;
2136         }
2137         return session;
2138 }
2139 EXPORT_SYMBOL_GPL(iscsi_create_session);
2140
2141 static void iscsi_conn_release(struct device *dev)
2142 {
2143         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2144         struct device *parent = conn->dev.parent;
2145
2146         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2147         kfree(conn);
2148         put_device(parent);
2149 }
2150
2151 static int iscsi_is_conn_dev(const struct device *dev)
2152 {
2153         return dev->release == iscsi_conn_release;
2154 }
2155
2156 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2157 {
2158         if (!iscsi_is_conn_dev(dev))
2159                 return 0;
2160         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2161 }
2162
2163 void iscsi_remove_session(struct iscsi_cls_session *session)
2164 {
2165         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2166         unsigned long flags;
2167         int err;
2168
2169         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2170
2171         spin_lock_irqsave(&sesslock, flags);
2172         list_del(&session->sess_list);
2173         spin_unlock_irqrestore(&sesslock, flags);
2174
2175         /* make sure there are no blocks/unblocks queued */
2176         flush_workqueue(iscsi_eh_timer_workq);
2177         /* make sure the timedout callout is not running */
2178         if (!cancel_delayed_work(&session->recovery_work))
2179                 flush_workqueue(iscsi_eh_timer_workq);
2180         /*
2181          * If we are blocked let commands flow again. The lld or iscsi
2182          * layer should set up the queuecommand to fail commands.
2183          * We assume that LLD will not be calling block/unblock while
2184          * removing the session.
2185          */
2186         spin_lock_irqsave(&session->lock, flags);
2187         session->state = ISCSI_SESSION_FREE;
2188         spin_unlock_irqrestore(&session->lock, flags);
2189
2190         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2191         /* flush running scans then delete devices */
2192         scsi_flush_work(shost);
2193         __iscsi_unbind_session(&session->unbind_work);
2194
2195         /* hw iscsi may not have removed all connections from session */
2196         err = device_for_each_child(&session->dev, NULL,
2197                                     iscsi_iter_destroy_conn_fn);
2198         if (err)
2199                 iscsi_cls_session_printk(KERN_ERR, session,
2200                                          "Could not delete all connections "
2201                                          "for session. Error %d.\n", err);
2202
2203         transport_unregister_device(&session->dev);
2204
2205         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2206         device_del(&session->dev);
2207 }
2208 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2209
2210 void iscsi_free_session(struct iscsi_cls_session *session)
2211 {
2212         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2213         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2214         put_device(&session->dev);
2215 }
2216 EXPORT_SYMBOL_GPL(iscsi_free_session);
2217
2218 /**
2219  * iscsi_destroy_session - destroy iscsi session
2220  * @session: iscsi_session
2221  *
2222  * Can be called by a LLD or iscsi_transport. There must not be
2223  * any running connections.
2224  */
2225 int iscsi_destroy_session(struct iscsi_cls_session *session)
2226 {
2227         iscsi_remove_session(session);
2228         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
2229         iscsi_free_session(session);
2230         return 0;
2231 }
2232 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
2233
2234 /**
2235  * iscsi_create_conn - create iscsi class connection
2236  * @session: iscsi cls session
2237  * @dd_size: private driver data size
2238  * @cid: connection id
2239  *
2240  * This can be called from a LLD or iscsi_transport. The connection
2241  * is child of the session so cid must be unique for all connections
2242  * on the session.
2243  *
2244  * Since we do not support MCS, cid will normally be zero. In some cases
2245  * for software iscsi we could be trying to preallocate a connection struct
2246  * in which case there could be two connection structs and cid would be
2247  * non-zero.
2248  */
2249 struct iscsi_cls_conn *
2250 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2251 {
2252         struct iscsi_transport *transport = session->transport;
2253         struct iscsi_cls_conn *conn;
2254         unsigned long flags;
2255         int err;
2256
2257         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2258         if (!conn)
2259                 return NULL;
2260         if (dd_size)
2261                 conn->dd_data = &conn[1];
2262
2263         mutex_init(&conn->ep_mutex);
2264         INIT_LIST_HEAD(&conn->conn_list);
2265         conn->transport = transport;
2266         conn->cid = cid;
2267
2268         /* this is released in the dev's release function */
2269         if (!get_device(&session->dev))
2270                 goto free_conn;
2271
2272         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2273         conn->dev.parent = &session->dev;
2274         conn->dev.release = iscsi_conn_release;
2275         err = device_register(&conn->dev);
2276         if (err) {
2277                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2278                                          "register connection's dev\n");
2279                 goto release_parent_ref;
2280         }
2281         transport_register_device(&conn->dev);
2282
2283         spin_lock_irqsave(&connlock, flags);
2284         list_add(&conn->conn_list, &connlist);
2285         spin_unlock_irqrestore(&connlock, flags);
2286
2287         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2288         return conn;
2289
2290 release_parent_ref:
2291         put_device(&session->dev);
2292 free_conn:
2293         kfree(conn);
2294         return NULL;
2295 }
2296
2297 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2298
2299 /**
2300  * iscsi_destroy_conn - destroy iscsi class connection
2301  * @conn: iscsi cls session
2302  *
2303  * This can be called from a LLD or iscsi_transport.
2304  */
2305 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2306 {
2307         unsigned long flags;
2308
2309         spin_lock_irqsave(&connlock, flags);
2310         list_del(&conn->conn_list);
2311         spin_unlock_irqrestore(&connlock, flags);
2312
2313         transport_unregister_device(&conn->dev);
2314         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2315         device_unregister(&conn->dev);
2316         return 0;
2317 }
2318 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2319
2320 /*
2321  * iscsi interface functions
2322  */
2323 static struct iscsi_internal *
2324 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2325 {
2326         struct iscsi_internal *priv;
2327         unsigned long flags;
2328
2329         spin_lock_irqsave(&iscsi_transport_lock, flags);
2330         list_for_each_entry(priv, &iscsi_transports, list) {
2331                 if (tt == priv->iscsi_transport) {
2332                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2333                         return priv;
2334                 }
2335         }
2336         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2337         return NULL;
2338 }
2339
2340 static int
2341 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2342 {
2343         return nlmsg_multicast(nls, skb, 0, group, gfp);
2344 }
2345
2346 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2347                    char *data, uint32_t data_size)
2348 {
2349         struct nlmsghdr *nlh;
2350         struct sk_buff *skb;
2351         struct iscsi_uevent *ev;
2352         char *pdu;
2353         struct iscsi_internal *priv;
2354         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2355                                    data_size);
2356
2357         priv = iscsi_if_transport_lookup(conn->transport);
2358         if (!priv)
2359                 return -EINVAL;
2360
2361         skb = alloc_skb(len, GFP_ATOMIC);
2362         if (!skb) {
2363                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2364                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2365                                       "control PDU: OOM\n");
2366                 return -ENOMEM;
2367         }
2368
2369         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2370         ev = nlmsg_data(nlh);
2371         memset(ev, 0, sizeof(*ev));
2372         ev->transport_handle = iscsi_handle(conn->transport);
2373         ev->type = ISCSI_KEVENT_RECV_PDU;
2374         ev->r.recv_req.cid = conn->cid;
2375         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2376         pdu = (char*)ev + sizeof(*ev);
2377         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2378         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2379
2380         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2381 }
2382 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2383
2384 int iscsi_offload_mesg(struct Scsi_Host *shost,
2385                        struct iscsi_transport *transport, uint32_t type,
2386                        char *data, uint16_t data_size)
2387 {
2388         struct nlmsghdr *nlh;
2389         struct sk_buff *skb;
2390         struct iscsi_uevent *ev;
2391         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2392
2393         skb = alloc_skb(len, GFP_ATOMIC);
2394         if (!skb) {
2395                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2396                 return -ENOMEM;
2397         }
2398
2399         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2400         ev = nlmsg_data(nlh);
2401         memset(ev, 0, sizeof(*ev));
2402         ev->type = type;
2403         ev->transport_handle = iscsi_handle(transport);
2404         switch (type) {
2405         case ISCSI_KEVENT_PATH_REQ:
2406                 ev->r.req_path.host_no = shost->host_no;
2407                 break;
2408         case ISCSI_KEVENT_IF_DOWN:
2409                 ev->r.notify_if_down.host_no = shost->host_no;
2410                 break;
2411         }
2412
2413         memcpy((char *)ev + sizeof(*ev), data, data_size);
2414
2415         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2416 }
2417 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2418
2419 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2420 {
2421         struct nlmsghdr *nlh;
2422         struct sk_buff  *skb;
2423         struct iscsi_uevent *ev;
2424         struct iscsi_internal *priv;
2425         int len = nlmsg_total_size(sizeof(*ev));
2426
2427         priv = iscsi_if_transport_lookup(conn->transport);
2428         if (!priv)
2429                 return;
2430
2431         skb = alloc_skb(len, GFP_ATOMIC);
2432         if (!skb) {
2433                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2434                                       "conn error (%d)\n", error);
2435                 return;
2436         }
2437
2438         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2439         ev = nlmsg_data(nlh);
2440         ev->transport_handle = iscsi_handle(conn->transport);
2441         ev->type = ISCSI_KEVENT_CONN_ERROR;
2442         ev->r.connerror.error = error;
2443         ev->r.connerror.cid = conn->cid;
2444         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2445
2446         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2447
2448         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2449                               error);
2450 }
2451 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2452
2453 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2454                             enum iscsi_conn_state state)
2455 {
2456         struct nlmsghdr *nlh;
2457         struct sk_buff  *skb;
2458         struct iscsi_uevent *ev;
2459         struct iscsi_internal *priv;
2460         int len = nlmsg_total_size(sizeof(*ev));
2461
2462         priv = iscsi_if_transport_lookup(conn->transport);
2463         if (!priv)
2464                 return;
2465
2466         skb = alloc_skb(len, GFP_ATOMIC);
2467         if (!skb) {
2468                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2469                                       "conn login (%d)\n", state);
2470                 return;
2471         }
2472
2473         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2474         ev = nlmsg_data(nlh);
2475         ev->transport_handle = iscsi_handle(conn->transport);
2476         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2477         ev->r.conn_login.state = state;
2478         ev->r.conn_login.cid = conn->cid;
2479         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2480         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2481
2482         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2483                               state);
2484 }
2485 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2486
2487 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2488                            enum iscsi_host_event_code code, uint32_t data_size,
2489                            uint8_t *data)
2490 {
2491         struct nlmsghdr *nlh;
2492         struct sk_buff *skb;
2493         struct iscsi_uevent *ev;
2494         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2495
2496         skb = alloc_skb(len, GFP_NOIO);
2497         if (!skb) {
2498                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2499                        host_no, code);
2500                 return;
2501         }
2502
2503         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2504         ev = nlmsg_data(nlh);
2505         ev->transport_handle = iscsi_handle(transport);
2506         ev->type = ISCSI_KEVENT_HOST_EVENT;
2507         ev->r.host_event.host_no = host_no;
2508         ev->r.host_event.code = code;
2509         ev->r.host_event.data_size = data_size;
2510
2511         if (data_size)
2512                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2513
2514         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2515 }
2516 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2517
2518 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2519                            uint32_t status, uint32_t pid, uint32_t data_size,
2520                            uint8_t *data)
2521 {
2522         struct nlmsghdr *nlh;
2523         struct sk_buff *skb;
2524         struct iscsi_uevent *ev;
2525         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2526
2527         skb = alloc_skb(len, GFP_NOIO);
2528         if (!skb) {
2529                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2530                 return;
2531         }
2532
2533         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2534         ev = nlmsg_data(nlh);
2535         ev->transport_handle = iscsi_handle(transport);
2536         ev->type = ISCSI_KEVENT_PING_COMP;
2537         ev->r.ping_comp.host_no = host_no;
2538         ev->r.ping_comp.status = status;
2539         ev->r.ping_comp.pid = pid;
2540         ev->r.ping_comp.data_size = data_size;
2541         memcpy((char *)ev + sizeof(*ev), data, data_size);
2542
2543         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2544 }
2545 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2546
2547 static int
2548 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
2549                     void *payload, int size)
2550 {
2551         struct sk_buff  *skb;
2552         struct nlmsghdr *nlh;
2553         int len = nlmsg_total_size(size);
2554         int flags = multi ? NLM_F_MULTI : 0;
2555         int t = done ? NLMSG_DONE : type;
2556
2557         skb = alloc_skb(len, GFP_ATOMIC);
2558         if (!skb) {
2559                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2560                 return -ENOMEM;
2561         }
2562
2563         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
2564         nlh->nlmsg_flags = flags;
2565         memcpy(nlmsg_data(nlh), payload, size);
2566         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
2567 }
2568
2569 static int
2570 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2571 {
2572         struct iscsi_uevent *ev = nlmsg_data(nlh);
2573         struct iscsi_stats *stats;
2574         struct sk_buff *skbstat;
2575         struct iscsi_cls_conn *conn;
2576         struct nlmsghdr *nlhstat;
2577         struct iscsi_uevent *evstat;
2578         struct iscsi_internal *priv;
2579         int len = nlmsg_total_size(sizeof(*ev) +
2580                                    sizeof(struct iscsi_stats) +
2581                                    sizeof(struct iscsi_stats_custom) *
2582                                    ISCSI_STATS_CUSTOM_MAX);
2583         int err = 0;
2584
2585         priv = iscsi_if_transport_lookup(transport);
2586         if (!priv)
2587                 return -EINVAL;
2588
2589         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2590         if (!conn)
2591                 return -EEXIST;
2592
2593         do {
2594                 int actual_size;
2595
2596                 skbstat = alloc_skb(len, GFP_ATOMIC);
2597                 if (!skbstat) {
2598                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2599                                               "deliver stats: OOM\n");
2600                         return -ENOMEM;
2601                 }
2602
2603                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2604                                       (len - sizeof(*nlhstat)), 0);
2605                 evstat = nlmsg_data(nlhstat);
2606                 memset(evstat, 0, sizeof(*evstat));
2607                 evstat->transport_handle = iscsi_handle(conn->transport);
2608                 evstat->type = nlh->nlmsg_type;
2609                 evstat->u.get_stats.cid =
2610                         ev->u.get_stats.cid;
2611                 evstat->u.get_stats.sid =
2612                         ev->u.get_stats.sid;
2613                 stats = (struct iscsi_stats *)
2614                         ((char*)evstat + sizeof(*evstat));
2615                 memset(stats, 0, sizeof(*stats));
2616
2617                 transport->get_stats(conn, stats);
2618                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2619                                                sizeof(struct iscsi_stats) +
2620                                                sizeof(struct iscsi_stats_custom) *
2621                                                stats->custom_length);
2622                 actual_size -= sizeof(*nlhstat);
2623                 actual_size = nlmsg_msg_size(actual_size);
2624                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2625                 nlhstat->nlmsg_len = actual_size;
2626
2627                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2628                                           GFP_ATOMIC);
2629         } while (err < 0 && err != -ECONNREFUSED);
2630
2631         return err;
2632 }
2633
2634 /**
2635  * iscsi_session_event - send session destr. completion event
2636  * @session: iscsi class session
2637  * @event: type of event
2638  */
2639 int iscsi_session_event(struct iscsi_cls_session *session,
2640                         enum iscsi_uevent_e event)
2641 {
2642         struct iscsi_internal *priv;
2643         struct Scsi_Host *shost;
2644         struct iscsi_uevent *ev;
2645         struct sk_buff  *skb;
2646         struct nlmsghdr *nlh;
2647         int rc, len = nlmsg_total_size(sizeof(*ev));
2648
2649         priv = iscsi_if_transport_lookup(session->transport);
2650         if (!priv)
2651                 return -EINVAL;
2652         shost = iscsi_session_to_shost(session);
2653
2654         skb = alloc_skb(len, GFP_KERNEL);
2655         if (!skb) {
2656                 iscsi_cls_session_printk(KERN_ERR, session,
2657                                          "Cannot notify userspace of session "
2658                                          "event %u\n", event);
2659                 return -ENOMEM;
2660         }
2661
2662         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2663         ev = nlmsg_data(nlh);
2664         ev->transport_handle = iscsi_handle(session->transport);
2665
2666         ev->type = event;
2667         switch (event) {
2668         case ISCSI_KEVENT_DESTROY_SESSION:
2669                 ev->r.d_session.host_no = shost->host_no;
2670                 ev->r.d_session.sid = session->sid;
2671                 break;
2672         case ISCSI_KEVENT_CREATE_SESSION:
2673                 ev->r.c_session_ret.host_no = shost->host_no;
2674                 ev->r.c_session_ret.sid = session->sid;
2675                 break;
2676         case ISCSI_KEVENT_UNBIND_SESSION:
2677                 ev->r.unbind_session.host_no = shost->host_no;
2678                 ev->r.unbind_session.sid = session->sid;
2679                 break;
2680         default:
2681                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2682                                          "%u.\n", event);
2683                 kfree_skb(skb);
2684                 return -EINVAL;
2685         }
2686
2687         /*
2688          * this will occur if the daemon is not up, so we just warn
2689          * the user and when the daemon is restarted it will handle it
2690          */
2691         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2692         if (rc == -ESRCH)
2693                 iscsi_cls_session_printk(KERN_ERR, session,
2694                                          "Cannot notify userspace of session "
2695                                          "event %u. Check iscsi daemon\n",
2696                                          event);
2697
2698         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2699                                 event, rc);
2700         return rc;
2701 }
2702 EXPORT_SYMBOL_GPL(iscsi_session_event);
2703
2704 static int
2705 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2706                         struct iscsi_uevent *ev, pid_t pid,
2707                         uint32_t initial_cmdsn, uint16_t cmds_max,
2708                         uint16_t queue_depth)
2709 {
2710         struct iscsi_transport *transport = priv->iscsi_transport;
2711         struct iscsi_cls_session *session;
2712         struct Scsi_Host *shost;
2713
2714         session = transport->create_session(ep, cmds_max, queue_depth,
2715                                             initial_cmdsn);
2716         if (!session)
2717                 return -ENOMEM;
2718
2719         session->creator = pid;
2720         shost = iscsi_session_to_shost(session);
2721         ev->r.c_session_ret.host_no = shost->host_no;
2722         ev->r.c_session_ret.sid = session->sid;
2723         ISCSI_DBG_TRANS_SESSION(session,
2724                                 "Completed creating transport session\n");
2725         return 0;
2726 }
2727
2728 static int
2729 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2730 {
2731         struct iscsi_cls_conn *conn;
2732         struct iscsi_cls_session *session;
2733
2734         session = iscsi_session_lookup(ev->u.c_conn.sid);
2735         if (!session) {
2736                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2737                        ev->u.c_conn.sid);
2738                 return -EINVAL;
2739         }
2740
2741         conn = transport->create_conn(session, ev->u.c_conn.cid);
2742         if (!conn) {
2743                 iscsi_cls_session_printk(KERN_ERR, session,
2744                                          "couldn't create a new connection.");
2745                 return -ENOMEM;
2746         }
2747
2748         ev->r.c_conn_ret.sid = session->sid;
2749         ev->r.c_conn_ret.cid = conn->cid;
2750
2751         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2752         return 0;
2753 }
2754
2755 static int
2756 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2757 {
2758         struct iscsi_cls_conn *conn;
2759
2760         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2761         if (!conn)
2762                 return -EINVAL;
2763
2764         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2765         if (transport->destroy_conn)
2766                 transport->destroy_conn(conn);
2767
2768         return 0;
2769 }
2770
2771 static int
2772 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2773 {
2774         char *data = (char*)ev + sizeof(*ev);
2775         struct iscsi_cls_conn *conn;
2776         struct iscsi_cls_session *session;
2777         int err = 0, value = 0;
2778
2779         session = iscsi_session_lookup(ev->u.set_param.sid);
2780         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2781         if (!conn || !session)
2782                 return -EINVAL;
2783
2784         switch (ev->u.set_param.param) {
2785         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2786                 sscanf(data, "%d", &value);
2787                 session->recovery_tmo = value;
2788                 break;
2789         default:
2790                 err = transport->set_param(conn, ev->u.set_param.param,
2791                                            data, ev->u.set_param.len);
2792         }
2793
2794         return err;
2795 }
2796
2797 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2798                                struct iscsi_uevent *ev, int msg_type)
2799 {
2800         struct iscsi_endpoint *ep;
2801         struct sockaddr *dst_addr;
2802         struct Scsi_Host *shost = NULL;
2803         int non_blocking, err = 0;
2804
2805         if (!transport->ep_connect)
2806                 return -EINVAL;
2807
2808         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2809                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2810                 if (!shost) {
2811                         printk(KERN_ERR "ep connect failed. Could not find "
2812                                "host no %u\n",
2813                                ev->u.ep_connect_through_host.host_no);
2814                         return -ENODEV;
2815                 }
2816                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2817         } else
2818                 non_blocking = ev->u.ep_connect.non_blocking;
2819
2820         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2821         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2822         if (IS_ERR(ep)) {
2823                 err = PTR_ERR(ep);
2824                 goto release_host;
2825         }
2826
2827         ev->r.ep_connect_ret.handle = ep->id;
2828 release_host:
2829         if (shost)
2830                 scsi_host_put(shost);
2831         return err;
2832 }
2833
2834 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2835                                   u64 ep_handle)
2836 {
2837         struct iscsi_cls_conn *conn;
2838         struct iscsi_endpoint *ep;
2839
2840         if (!transport->ep_disconnect)
2841                 return -EINVAL;
2842
2843         ep = iscsi_lookup_endpoint(ep_handle);
2844         if (!ep)
2845                 return -EINVAL;
2846         conn = ep->conn;
2847         if (conn) {
2848                 mutex_lock(&conn->ep_mutex);
2849                 conn->ep = NULL;
2850                 mutex_unlock(&conn->ep_mutex);
2851         }
2852
2853         transport->ep_disconnect(ep);
2854         return 0;
2855 }
2856
2857 static int
2858 iscsi_if_transport_ep(struct iscsi_transport *transport,
2859                       struct iscsi_uevent *ev, int msg_type)
2860 {
2861         struct iscsi_endpoint *ep;
2862         int rc = 0;
2863
2864         switch (msg_type) {
2865         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2866         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2867                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2868                 break;
2869         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2870                 if (!transport->ep_poll)
2871                         return -EINVAL;
2872
2873                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2874                 if (!ep)
2875                         return -EINVAL;
2876
2877                 ev->r.retcode = transport->ep_poll(ep,
2878                                                    ev->u.ep_poll.timeout_ms);
2879                 break;
2880         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2881                 rc = iscsi_if_ep_disconnect(transport,
2882                                             ev->u.ep_disconnect.ep_handle);
2883                 break;
2884         }
2885         return rc;
2886 }
2887
2888 static int
2889 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2890                 struct iscsi_uevent *ev)
2891 {
2892         struct Scsi_Host *shost;
2893         struct sockaddr *dst_addr;
2894         int err;
2895
2896         if (!transport->tgt_dscvr)
2897                 return -EINVAL;
2898
2899         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2900         if (!shost) {
2901                 printk(KERN_ERR "target discovery could not find host no %u\n",
2902                        ev->u.tgt_dscvr.host_no);
2903                 return -ENODEV;
2904         }
2905
2906
2907         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2908         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2909                                    ev->u.tgt_dscvr.enable, dst_addr);
2910         scsi_host_put(shost);
2911         return err;
2912 }
2913
2914 static int
2915 iscsi_set_host_param(struct iscsi_transport *transport,
2916                      struct iscsi_uevent *ev)
2917 {
2918         char *data = (char*)ev + sizeof(*ev);
2919         struct Scsi_Host *shost;
2920         int err;
2921
2922         if (!transport->set_host_param)
2923                 return -ENOSYS;
2924
2925         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2926         if (!shost) {
2927                 printk(KERN_ERR "set_host_param could not find host no %u\n",
2928                        ev->u.set_host_param.host_no);
2929                 return -ENODEV;
2930         }
2931
2932         err = transport->set_host_param(shost, ev->u.set_host_param.param,
2933                                         data, ev->u.set_host_param.len);
2934         scsi_host_put(shost);
2935         return err;
2936 }
2937
2938 static int
2939 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2940 {
2941         struct Scsi_Host *shost;
2942         struct iscsi_path *params;
2943         int err;
2944
2945         if (!transport->set_path)
2946                 return -ENOSYS;
2947
2948         shost = scsi_host_lookup(ev->u.set_path.host_no);
2949         if (!shost) {
2950                 printk(KERN_ERR "set path could not find host no %u\n",
2951                        ev->u.set_path.host_no);
2952                 return -ENODEV;
2953         }
2954
2955         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2956         err = transport->set_path(shost, params);
2957
2958         scsi_host_put(shost);
2959         return err;
2960 }
2961
2962 static int
2963 iscsi_set_iface_params(struct iscsi_transport *transport,
2964                        struct iscsi_uevent *ev, uint32_t len)
2965 {
2966         char *data = (char *)ev + sizeof(*ev);
2967         struct Scsi_Host *shost;
2968         int err;
2969
2970         if (!transport->set_iface_param)
2971                 return -ENOSYS;
2972
2973         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2974         if (!shost) {
2975                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
2976                        ev->u.set_iface_params.host_no);
2977                 return -ENODEV;
2978         }
2979
2980         err = transport->set_iface_param(shost, data, len);
2981         scsi_host_put(shost);
2982         return err;
2983 }
2984
2985 static int
2986 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2987 {
2988         struct Scsi_Host *shost;
2989         struct sockaddr *dst_addr;
2990         int err;
2991
2992         if (!transport->send_ping)
2993                 return -ENOSYS;
2994
2995         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
2996         if (!shost) {
2997                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
2998                        ev->u.iscsi_ping.host_no);
2999                 return -ENODEV;
3000         }
3001
3002         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3003         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3004                                    ev->u.iscsi_ping.iface_type,
3005                                    ev->u.iscsi_ping.payload_size,
3006                                    ev->u.iscsi_ping.pid,
3007                                    dst_addr);
3008         scsi_host_put(shost);
3009         return err;
3010 }
3011
3012 static int
3013 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3014 {
3015         struct iscsi_uevent *ev = nlmsg_data(nlh);
3016         struct Scsi_Host *shost = NULL;
3017         struct iscsi_chap_rec *chap_rec;
3018         struct iscsi_internal *priv;
3019         struct sk_buff *skbchap;
3020         struct nlmsghdr *nlhchap;
3021         struct iscsi_uevent *evchap;
3022         uint32_t chap_buf_size;
3023         int len, err = 0;
3024         char *buf;
3025
3026         if (!transport->get_chap)
3027                 return -EINVAL;
3028
3029         priv = iscsi_if_transport_lookup(transport);
3030         if (!priv)
3031                 return -EINVAL;
3032
3033         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3034         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3035
3036         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3037         if (!shost) {
3038                 printk(KERN_ERR "%s: failed. Cound not find host no %u\n",
3039                        __func__, ev->u.get_chap.host_no);
3040                 return -ENODEV;
3041         }
3042
3043         do {
3044                 int actual_size;
3045
3046                 skbchap = alloc_skb(len, GFP_KERNEL);
3047                 if (!skbchap) {
3048                         printk(KERN_ERR "can not deliver chap: OOM\n");
3049                         err = -ENOMEM;
3050                         goto exit_get_chap;
3051                 }
3052
3053                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3054                                       (len - sizeof(*nlhchap)), 0);
3055                 evchap = nlmsg_data(nlhchap);
3056                 memset(evchap, 0, sizeof(*evchap));
3057                 evchap->transport_handle = iscsi_handle(transport);
3058                 evchap->type = nlh->nlmsg_type;
3059                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3060                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3061                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3062                 buf = (char *)evchap + sizeof(*evchap);
3063                 memset(buf, 0, chap_buf_size);
3064
3065                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3066                                     &evchap->u.get_chap.num_entries, buf);
3067
3068                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3069                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3070                 nlhchap->nlmsg_len = actual_size;
3071
3072                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3073                                           GFP_KERNEL);
3074         } while (err < 0 && err != -ECONNREFUSED);
3075
3076 exit_get_chap:
3077         scsi_host_put(shost);
3078         return err;
3079 }
3080
3081 static int iscsi_set_chap(struct iscsi_transport *transport,
3082                           struct iscsi_uevent *ev, uint32_t len)
3083 {
3084         char *data = (char *)ev + sizeof(*ev);
3085         struct Scsi_Host *shost;
3086         int err = 0;
3087
3088         if (!transport->set_chap)
3089                 return -ENOSYS;
3090
3091         shost = scsi_host_lookup(ev->u.set_path.host_no);
3092         if (!shost) {
3093                 pr_err("%s could not find host no %u\n",
3094                        __func__, ev->u.set_path.host_no);
3095                 return -ENODEV;
3096         }
3097
3098         err = transport->set_chap(shost, data, len);
3099         scsi_host_put(shost);
3100         return err;
3101 }
3102
3103 static int iscsi_delete_chap(struct iscsi_transport *transport,
3104                              struct iscsi_uevent *ev)
3105 {
3106         struct Scsi_Host *shost;
3107         int err = 0;
3108
3109         if (!transport->delete_chap)
3110                 return -ENOSYS;
3111
3112         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3113         if (!shost) {
3114                 printk(KERN_ERR "%s could not find host no %u\n",
3115                        __func__, ev->u.delete_chap.host_no);
3116                 return -ENODEV;
3117         }
3118
3119         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3120         scsi_host_put(shost);
3121         return err;
3122 }
3123
3124 static const struct {
3125         enum iscsi_discovery_parent_type value;
3126         char                            *name;
3127 } iscsi_discovery_parent_names[] = {
3128         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3129         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3130         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3131 };
3132
3133 char *iscsi_get_discovery_parent_name(int parent_type)
3134 {
3135         int i;
3136         char *state = "Unknown!";
3137
3138         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3139                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3140                         state = iscsi_discovery_parent_names[i].name;
3141                         break;
3142                 }
3143         }
3144         return state;
3145 }
3146 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3147
3148 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3149                                      struct iscsi_uevent *ev, uint32_t len)
3150 {
3151         char *data = (char *)ev + sizeof(*ev);
3152         struct Scsi_Host *shost;
3153         struct iscsi_bus_flash_session *fnode_sess;
3154         struct iscsi_bus_flash_conn *fnode_conn;
3155         struct device *dev;
3156         uint32_t idx;
3157         int err = 0;
3158
3159         if (!transport->set_flashnode_param) {
3160                 err = -ENOSYS;
3161                 goto exit_set_fnode;
3162         }
3163
3164         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3165         if (!shost) {
3166                 pr_err("%s could not find host no %u\n",
3167                        __func__, ev->u.set_flashnode.host_no);
3168                 err = -ENODEV;
3169                 goto put_host;
3170         }
3171
3172         idx = ev->u.set_flashnode.flashnode_idx;
3173         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3174         if (!fnode_sess) {
3175                 pr_err("%s could not find flashnode %u for host no %u\n",
3176                        __func__, idx, ev->u.set_flashnode.host_no);
3177                 err = -ENODEV;
3178                 goto put_host;
3179         }
3180
3181         dev = iscsi_find_flashnode_conn(fnode_sess);
3182         if (!dev) {
3183                 err = -ENODEV;
3184                 goto put_sess;
3185         }
3186
3187         fnode_conn = iscsi_dev_to_flash_conn(dev);
3188         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3189         put_device(dev);
3190
3191 put_sess:
3192         put_device(&fnode_sess->dev);
3193
3194 put_host:
3195         scsi_host_put(shost);
3196
3197 exit_set_fnode:
3198         return err;
3199 }
3200
3201 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3202                                struct iscsi_uevent *ev, uint32_t len)
3203 {
3204         char *data = (char *)ev + sizeof(*ev);
3205         struct Scsi_Host *shost;
3206         int index;
3207         int err = 0;
3208
3209         if (!transport->new_flashnode) {
3210                 err = -ENOSYS;
3211                 goto exit_new_fnode;
3212         }
3213
3214         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3215         if (!shost) {
3216                 pr_err("%s could not find host no %u\n",
3217                        __func__, ev->u.new_flashnode.host_no);
3218                 err = -ENODEV;
3219                 goto put_host;
3220         }
3221
3222         index = transport->new_flashnode(shost, data, len);
3223
3224         if (index >= 0)
3225                 ev->r.new_flashnode_ret.flashnode_idx = index;
3226         else
3227                 err = -EIO;
3228
3229 put_host:
3230         scsi_host_put(shost);
3231
3232 exit_new_fnode:
3233         return err;
3234 }
3235
3236 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3237                                struct iscsi_uevent *ev)
3238 {
3239         struct Scsi_Host *shost;
3240         struct iscsi_bus_flash_session *fnode_sess;
3241         uint32_t idx;
3242         int err = 0;
3243
3244         if (!transport->del_flashnode) {
3245                 err = -ENOSYS;
3246                 goto exit_del_fnode;
3247         }
3248
3249         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3250         if (!shost) {
3251                 pr_err("%s could not find host no %u\n",
3252                        __func__, ev->u.del_flashnode.host_no);
3253                 err = -ENODEV;
3254                 goto put_host;
3255         }
3256
3257         idx = ev->u.del_flashnode.flashnode_idx;
3258         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3259         if (!fnode_sess) {
3260                 pr_err("%s could not find flashnode %u for host no %u\n",
3261                        __func__, idx, ev->u.del_flashnode.host_no);
3262                 err = -ENODEV;
3263                 goto put_host;
3264         }
3265
3266         err = transport->del_flashnode(fnode_sess);
3267         put_device(&fnode_sess->dev);
3268
3269 put_host:
3270         scsi_host_put(shost);
3271
3272 exit_del_fnode:
3273         return err;
3274 }
3275
3276 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3277                                  struct iscsi_uevent *ev)
3278 {
3279         struct Scsi_Host *shost;
3280         struct iscsi_bus_flash_session *fnode_sess;
3281         struct iscsi_bus_flash_conn *fnode_conn;
3282         struct device *dev;
3283         uint32_t idx;
3284         int err = 0;
3285
3286         if (!transport->login_flashnode) {
3287                 err = -ENOSYS;
3288                 goto exit_login_fnode;
3289         }
3290
3291         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3292         if (!shost) {
3293                 pr_err("%s could not find host no %u\n",
3294                        __func__, ev->u.login_flashnode.host_no);
3295                 err = -ENODEV;
3296                 goto put_host;
3297         }
3298
3299         idx = ev->u.login_flashnode.flashnode_idx;
3300         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3301         if (!fnode_sess) {
3302                 pr_err("%s could not find flashnode %u for host no %u\n",
3303                        __func__, idx, ev->u.login_flashnode.host_no);
3304                 err = -ENODEV;
3305                 goto put_host;
3306         }
3307
3308         dev = iscsi_find_flashnode_conn(fnode_sess);
3309         if (!dev) {
3310                 err = -ENODEV;
3311                 goto put_sess;
3312         }
3313
3314         fnode_conn = iscsi_dev_to_flash_conn(dev);
3315         err = transport->login_flashnode(fnode_sess, fnode_conn);
3316         put_device(dev);
3317
3318 put_sess:
3319         put_device(&fnode_sess->dev);
3320
3321 put_host:
3322         scsi_host_put(shost);
3323
3324 exit_login_fnode:
3325         return err;
3326 }
3327
3328 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3329                                   struct iscsi_uevent *ev)
3330 {
3331         struct Scsi_Host *shost;
3332         struct iscsi_bus_flash_session *fnode_sess;
3333         struct iscsi_bus_flash_conn *fnode_conn;
3334         struct device *dev;
3335         uint32_t idx;
3336         int err = 0;
3337
3338         if (!transport->logout_flashnode) {
3339                 err = -ENOSYS;
3340                 goto exit_logout_fnode;
3341         }
3342
3343         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3344         if (!shost) {
3345                 pr_err("%s could not find host no %u\n",
3346                        __func__, ev->u.logout_flashnode.host_no);
3347                 err = -ENODEV;
3348                 goto put_host;
3349         }
3350
3351         idx = ev->u.logout_flashnode.flashnode_idx;
3352         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3353         if (!fnode_sess) {
3354                 pr_err("%s could not find flashnode %u for host no %u\n",
3355                        __func__, idx, ev->u.logout_flashnode.host_no);
3356                 err = -ENODEV;
3357                 goto put_host;
3358         }
3359
3360         dev = iscsi_find_flashnode_conn(fnode_sess);
3361         if (!dev) {
3362                 err = -ENODEV;
3363                 goto put_sess;
3364         }
3365
3366         fnode_conn = iscsi_dev_to_flash_conn(dev);
3367
3368         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3369         put_device(dev);
3370
3371 put_sess:
3372         put_device(&fnode_sess->dev);
3373
3374 put_host:
3375         scsi_host_put(shost);
3376
3377 exit_logout_fnode:
3378         return err;
3379 }
3380
3381 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3382                                       struct iscsi_uevent *ev)
3383 {
3384         struct Scsi_Host *shost;
3385         struct iscsi_cls_session *session;
3386         int err = 0;
3387
3388         if (!transport->logout_flashnode_sid) {
3389                 err = -ENOSYS;
3390                 goto exit_logout_sid;
3391         }
3392
3393         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3394         if (!shost) {
3395                 pr_err("%s could not find host no %u\n",
3396                        __func__, ev->u.logout_flashnode.host_no);
3397                 err = -ENODEV;
3398                 goto put_host;
3399         }
3400
3401         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3402         if (!session) {
3403                 pr_err("%s could not find session id %u\n",
3404                        __func__, ev->u.logout_flashnode_sid.sid);
3405                 err = -EINVAL;
3406                 goto put_host;
3407         }
3408
3409         err = transport->logout_flashnode_sid(session);
3410
3411 put_host:
3412         scsi_host_put(shost);
3413
3414 exit_logout_sid:
3415         return err;
3416 }
3417
3418 static int
3419 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3420 {
3421         struct iscsi_uevent *ev = nlmsg_data(nlh);
3422         struct Scsi_Host *shost = NULL;
3423         struct iscsi_internal *priv;
3424         struct sk_buff *skbhost_stats;
3425         struct nlmsghdr *nlhhost_stats;
3426         struct iscsi_uevent *evhost_stats;
3427         int host_stats_size = 0;
3428         int len, err = 0;
3429         char *buf;
3430
3431         if (!transport->get_host_stats)
3432                 return -ENOSYS;
3433
3434         priv = iscsi_if_transport_lookup(transport);
3435         if (!priv)
3436                 return -EINVAL;
3437
3438         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3439         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3440
3441         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3442         if (!shost) {
3443                 pr_err("%s: failed. Cound not find host no %u\n",
3444                        __func__, ev->u.get_host_stats.host_no);
3445                 return -ENODEV;
3446         }
3447
3448         do {
3449                 int actual_size;
3450
3451                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3452                 if (!skbhost_stats) {
3453                         pr_err("cannot deliver host stats: OOM\n");
3454                         err = -ENOMEM;
3455                         goto exit_host_stats;
3456                 }
3457
3458                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3459                                       (len - sizeof(*nlhhost_stats)), 0);
3460                 evhost_stats = nlmsg_data(nlhhost_stats);
3461                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3462                 evhost_stats->transport_handle = iscsi_handle(transport);
3463                 evhost_stats->type = nlh->nlmsg_type;
3464                 evhost_stats->u.get_host_stats.host_no =
3465                                         ev->u.get_host_stats.host_no;
3466                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3467                 memset(buf, 0, host_stats_size);
3468
3469                 err = transport->get_host_stats(shost, buf, host_stats_size);
3470                 if (err) {
3471                         kfree_skb(skbhost_stats);
3472                         goto exit_host_stats;
3473                 }
3474
3475                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3476                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3477                 nlhhost_stats->nlmsg_len = actual_size;
3478
3479                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3480                                           GFP_KERNEL);
3481         } while (err < 0 && err != -ECONNREFUSED);
3482
3483 exit_host_stats:
3484         scsi_host_put(shost);
3485         return err;
3486 }
3487
3488
3489 static int
3490 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3491 {
3492         int err = 0;
3493         struct iscsi_uevent *ev = nlmsg_data(nlh);
3494         struct iscsi_transport *transport = NULL;
3495         struct iscsi_internal *priv;
3496         struct iscsi_cls_session *session;
3497         struct iscsi_cls_conn *conn;
3498         struct iscsi_endpoint *ep = NULL;
3499
3500         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3501                 *group = ISCSI_NL_GRP_UIP;
3502         else
3503                 *group = ISCSI_NL_GRP_ISCSID;
3504
3505         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3506         if (!priv)
3507                 return -EINVAL;
3508         transport = priv->iscsi_transport;
3509
3510         if (!try_module_get(transport->owner))
3511                 return -EINVAL;
3512
3513         switch (nlh->nlmsg_type) {
3514         case ISCSI_UEVENT_CREATE_SESSION:
3515                 err = iscsi_if_create_session(priv, ep, ev,
3516                                               NETLINK_CB(skb).portid,
3517                                               ev->u.c_session.initial_cmdsn,
3518                                               ev->u.c_session.cmds_max,
3519                                               ev->u.c_session.queue_depth);
3520                 break;
3521         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3522                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3523                 if (!ep) {
3524                         err = -EINVAL;
3525                         break;
3526                 }
3527
3528                 err = iscsi_if_create_session(priv, ep, ev,
3529                                         NETLINK_CB(skb).portid,
3530                                         ev->u.c_bound_session.initial_cmdsn,
3531                                         ev->u.c_bound_session.cmds_max,
3532                                         ev->u.c_bound_session.queue_depth);
3533                 break;
3534         case ISCSI_UEVENT_DESTROY_SESSION:
3535                 session = iscsi_session_lookup(ev->u.d_session.sid);
3536                 if (session)
3537                         transport->destroy_session(session);
3538                 else
3539                         err = -EINVAL;
3540                 break;
3541         case ISCSI_UEVENT_UNBIND_SESSION:
3542                 session = iscsi_session_lookup(ev->u.d_session.sid);
3543                 if (session)
3544                         scsi_queue_work(iscsi_session_to_shost(session),
3545                                         &session->unbind_work);
3546                 else
3547                         err = -EINVAL;
3548                 break;
3549         case ISCSI_UEVENT_CREATE_CONN:
3550                 err = iscsi_if_create_conn(transport, ev);
3551                 break;
3552         case ISCSI_UEVENT_DESTROY_CONN:
3553                 err = iscsi_if_destroy_conn(transport, ev);
3554                 break;
3555         case ISCSI_UEVENT_BIND_CONN:
3556                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3557                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3558
3559                 if (conn && conn->ep)
3560                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3561
3562                 if (!session || !conn) {
3563                         err = -EINVAL;
3564                         break;
3565                 }
3566
3567                 ev->r.retcode = transport->bind_conn(session, conn,
3568                                                 ev->u.b_conn.transport_eph,
3569                                                 ev->u.b_conn.is_leading);
3570                 if (ev->r.retcode || !transport->ep_connect)
3571                         break;
3572
3573                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3574                 if (ep) {
3575                         ep->conn = conn;
3576
3577                         mutex_lock(&conn->ep_mutex);
3578                         conn->ep = ep;
3579                         mutex_unlock(&conn->ep_mutex);
3580                 } else
3581                         iscsi_cls_conn_printk(KERN_ERR, conn,
3582                                               "Could not set ep conn "
3583                                               "binding\n");
3584                 break;
3585         case ISCSI_UEVENT_SET_PARAM:
3586                 err = iscsi_set_param(transport, ev);
3587                 break;
3588         case ISCSI_UEVENT_START_CONN:
3589                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3590                 if (conn)
3591                         ev->r.retcode = transport->start_conn(conn);
3592                 else
3593                         err = -EINVAL;
3594                 break;
3595         case ISCSI_UEVENT_STOP_CONN:
3596                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3597                 if (conn)
3598                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3599                 else
3600                         err = -EINVAL;
3601                 break;
3602         case ISCSI_UEVENT_SEND_PDU:
3603                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3604                 if (conn)
3605                         ev->r.retcode = transport->send_pdu(conn,
3606                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3607                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3608                                 ev->u.send_pdu.data_size);
3609                 else
3610                         err = -EINVAL;
3611                 break;
3612         case ISCSI_UEVENT_GET_STATS:
3613                 err = iscsi_if_get_stats(transport, nlh);
3614                 break;
3615         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3616         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3617         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3618         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3619                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3620                 break;
3621         case ISCSI_UEVENT_TGT_DSCVR:
3622                 err = iscsi_tgt_dscvr(transport, ev);
3623                 break;
3624         case ISCSI_UEVENT_SET_HOST_PARAM:
3625                 err = iscsi_set_host_param(transport, ev);
3626                 break;
3627         case ISCSI_UEVENT_PATH_UPDATE:
3628                 err = iscsi_set_path(transport, ev);
3629                 break;
3630         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3631                 err = iscsi_set_iface_params(transport, ev,
3632                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3633                 break;
3634         case ISCSI_UEVENT_PING:
3635                 err = iscsi_send_ping(transport, ev);
3636                 break;
3637         case ISCSI_UEVENT_GET_CHAP:
3638                 err = iscsi_get_chap(transport, nlh);
3639                 break;
3640         case ISCSI_UEVENT_DELETE_CHAP:
3641                 err = iscsi_delete_chap(transport, ev);
3642                 break;
3643         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3644                 err = iscsi_set_flashnode_param(transport, ev,
3645                                                 nlmsg_attrlen(nlh,
3646                                                               sizeof(*ev)));
3647                 break;
3648         case ISCSI_UEVENT_NEW_FLASHNODE:
3649                 err = iscsi_new_flashnode(transport, ev,
3650                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3651                 break;
3652         case ISCSI_UEVENT_DEL_FLASHNODE:
3653                 err = iscsi_del_flashnode(transport, ev);
3654                 break;
3655         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3656                 err = iscsi_login_flashnode(transport, ev);
3657                 break;
3658         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3659                 err = iscsi_logout_flashnode(transport, ev);
3660                 break;
3661         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3662                 err = iscsi_logout_flashnode_sid(transport, ev);
3663                 break;
3664         case ISCSI_UEVENT_SET_CHAP:
3665                 err = iscsi_set_chap(transport, ev,
3666                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3667                 break;
3668         case ISCSI_UEVENT_GET_HOST_STATS:
3669                 err = iscsi_get_host_stats(transport, nlh);
3670                 break;
3671         default:
3672                 err = -ENOSYS;
3673                 break;
3674         }
3675
3676         module_put(transport->owner);
3677         return err;
3678 }
3679
3680 /*
3681  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3682  * Malformed skbs with wrong lengths or invalid creds are not processed.
3683  */
3684 static void
3685 iscsi_if_rx(struct sk_buff *skb)
3686 {
3687         mutex_lock(&rx_queue_mutex);
3688         while (skb->len >= NLMSG_HDRLEN) {
3689                 int err;
3690                 uint32_t rlen;
3691                 struct nlmsghdr *nlh;
3692                 struct iscsi_uevent *ev;
3693                 uint32_t group;
3694
3695                 nlh = nlmsg_hdr(skb);
3696                 if (nlh->nlmsg_len < sizeof(*nlh) ||
3697                     skb->len < nlh->nlmsg_len) {
3698                         break;
3699                 }
3700
3701                 ev = nlmsg_data(nlh);
3702                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3703                 if (rlen > skb->len)
3704                         rlen = skb->len;
3705
3706                 err = iscsi_if_recv_msg(skb, nlh, &group);
3707                 if (err) {
3708                         ev->type = ISCSI_KEVENT_IF_ERROR;
3709                         ev->iferror = err;
3710                 }
3711                 do {
3712                         /*
3713                          * special case for GET_STATS:
3714                          * on success - sending reply and stats from
3715                          * inside of if_recv_msg(),
3716                          * on error - fall through.
3717                          */
3718                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3719                                 break;
3720                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3721                                 break;
3722                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
3723                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
3724                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3725                 skb_pull(skb, rlen);
3726         }
3727         mutex_unlock(&rx_queue_mutex);
3728 }
3729
3730 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3731 struct device_attribute dev_attr_##_prefix##_##_name =  \
3732         __ATTR(_name,_mode,_show,_store)
3733
3734 /*
3735  * iSCSI connection attrs
3736  */
3737 #define iscsi_conn_attr_show(param)                                     \
3738 static ssize_t                                                          \
3739 show_conn_param_##param(struct device *dev,                             \
3740                         struct device_attribute *attr, char *buf)       \
3741 {                                                                       \
3742         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3743         struct iscsi_transport *t = conn->transport;                    \
3744         return t->get_conn_param(conn, param, buf);                     \
3745 }
3746
3747 #define iscsi_conn_attr(field, param)                                   \
3748         iscsi_conn_attr_show(param)                                     \
3749 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3750                         NULL);
3751
3752 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3753 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3754 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3755 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3756 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3757 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3758 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3759 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3760 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3761 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3762 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3763 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3764 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3765 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3766 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3767 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3768 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3769 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3770 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3771 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3772 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3773 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3774 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3775 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3776 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3777 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3778 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3779 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3780
3781
3782 #define iscsi_conn_ep_attr_show(param)                                  \
3783 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3784                                           struct device_attribute *attr,\
3785                                           char *buf)                    \
3786 {                                                                       \
3787         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3788         struct iscsi_transport *t = conn->transport;                    \
3789         struct iscsi_endpoint *ep;                                      \
3790         ssize_t rc;                                                     \
3791                                                                         \
3792         /*                                                              \
3793          * Need to make sure ep_disconnect does not free the LLD's      \
3794          * interconnect resources while we are trying to read them.     \
3795          */                                                             \
3796         mutex_lock(&conn->ep_mutex);                                    \
3797         ep = conn->ep;                                                  \
3798         if (!ep && t->ep_connect) {                                     \
3799                 mutex_unlock(&conn->ep_mutex);                          \
3800                 return -ENOTCONN;                                       \
3801         }                                                               \
3802                                                                         \
3803         if (ep)                                                         \
3804                 rc = t->get_ep_param(ep, param, buf);                   \
3805         else                                                            \
3806                 rc = t->get_conn_param(conn, param, buf);               \
3807         mutex_unlock(&conn->ep_mutex);                                  \
3808         return rc;                                                      \
3809 }
3810
3811 #define iscsi_conn_ep_attr(field, param)                                \
3812         iscsi_conn_ep_attr_show(param)                                  \
3813 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3814                         show_conn_ep_param_##param, NULL);
3815
3816 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3817 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3818
3819 static struct attribute *iscsi_conn_attrs[] = {
3820         &dev_attr_conn_max_recv_dlength.attr,
3821         &dev_attr_conn_max_xmit_dlength.attr,
3822         &dev_attr_conn_header_digest.attr,
3823         &dev_attr_conn_data_digest.attr,
3824         &dev_attr_conn_ifmarker.attr,
3825         &dev_attr_conn_ofmarker.attr,
3826         &dev_attr_conn_address.attr,
3827         &dev_attr_conn_port.attr,
3828         &dev_attr_conn_exp_statsn.attr,
3829         &dev_attr_conn_persistent_address.attr,
3830         &dev_attr_conn_persistent_port.attr,
3831         &dev_attr_conn_ping_tmo.attr,
3832         &dev_attr_conn_recv_tmo.attr,
3833         &dev_attr_conn_local_port.attr,
3834         &dev_attr_conn_statsn.attr,
3835         &dev_attr_conn_keepalive_tmo.attr,
3836         &dev_attr_conn_max_segment_size.attr,
3837         &dev_attr_conn_tcp_timestamp_stat.attr,
3838         &dev_attr_conn_tcp_wsf_disable.attr,
3839         &dev_attr_conn_tcp_nagle_disable.attr,
3840         &dev_attr_conn_tcp_timer_scale.attr,
3841         &dev_attr_conn_tcp_timestamp_enable.attr,
3842         &dev_attr_conn_fragment_disable.attr,
3843         &dev_attr_conn_ipv4_tos.attr,
3844         &dev_attr_conn_ipv6_traffic_class.attr,
3845         &dev_attr_conn_ipv6_flow_label.attr,
3846         &dev_attr_conn_is_fw_assigned_ipv6.attr,
3847         &dev_attr_conn_tcp_xmit_wsf.attr,
3848         &dev_attr_conn_tcp_recv_wsf.attr,
3849         &dev_attr_conn_local_ipaddr.attr,
3850         NULL,
3851 };
3852
3853 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3854                                          struct attribute *attr, int i)
3855 {
3856         struct device *cdev = container_of(kobj, struct device, kobj);
3857         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3858         struct iscsi_transport *t = conn->transport;
3859         int param;
3860
3861         if (attr == &dev_attr_conn_max_recv_dlength.attr)
3862                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3863         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3864                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3865         else if (attr == &dev_attr_conn_header_digest.attr)
3866                 param = ISCSI_PARAM_HDRDGST_EN;
3867         else if (attr == &dev_attr_conn_data_digest.attr)
3868                 param = ISCSI_PARAM_DATADGST_EN;
3869         else if (attr == &dev_attr_conn_ifmarker.attr)
3870                 param = ISCSI_PARAM_IFMARKER_EN;
3871         else if (attr == &dev_attr_conn_ofmarker.attr)
3872                 param = ISCSI_PARAM_OFMARKER_EN;
3873         else if (attr == &dev_attr_conn_address.attr)
3874                 param = ISCSI_PARAM_CONN_ADDRESS;
3875         else if (attr == &dev_attr_conn_port.attr)
3876                 param = ISCSI_PARAM_CONN_PORT;
3877         else if (attr == &dev_attr_conn_exp_statsn.attr)
3878                 param = ISCSI_PARAM_EXP_STATSN;
3879         else if (attr == &dev_attr_conn_persistent_address.attr)
3880                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3881         else if (attr == &dev_attr_conn_persistent_port.attr)
3882                 param = ISCSI_PARAM_PERSISTENT_PORT;
3883         else if (attr == &dev_attr_conn_ping_tmo.attr)
3884                 param = ISCSI_PARAM_PING_TMO;
3885         else if (attr == &dev_attr_conn_recv_tmo.attr)
3886                 param = ISCSI_PARAM_RECV_TMO;
3887         else if (attr == &dev_attr_conn_local_port.attr)
3888                 param = ISCSI_PARAM_LOCAL_PORT;
3889         else if (attr == &dev_attr_conn_statsn.attr)
3890                 param = ISCSI_PARAM_STATSN;
3891         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
3892                 param = ISCSI_PARAM_KEEPALIVE_TMO;
3893         else if (attr == &dev_attr_conn_max_segment_size.attr)
3894                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
3895         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
3896                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
3897         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
3898                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
3899         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
3900                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
3901         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
3902                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
3903         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
3904                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
3905         else if (attr == &dev_attr_conn_fragment_disable.attr)
3906                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
3907         else if (attr == &dev_attr_conn_ipv4_tos.attr)
3908                 param = ISCSI_PARAM_IPV4_TOS;
3909         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
3910                 param = ISCSI_PARAM_IPV6_TC;
3911         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
3912                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
3913         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
3914                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
3915         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
3916                 param = ISCSI_PARAM_TCP_XMIT_WSF;
3917         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
3918                 param = ISCSI_PARAM_TCP_RECV_WSF;
3919         else if (attr == &dev_attr_conn_local_ipaddr.attr)
3920                 param = ISCSI_PARAM_LOCAL_IPADDR;
3921         else {
3922                 WARN_ONCE(1, "Invalid conn attr");
3923                 return 0;
3924         }
3925
3926         return t->attr_is_visible(ISCSI_PARAM, param);
3927 }
3928
3929 static struct attribute_group iscsi_conn_group = {
3930         .attrs = iscsi_conn_attrs,
3931         .is_visible = iscsi_conn_attr_is_visible,
3932 };
3933
3934 /*
3935  * iSCSI session attrs
3936  */
3937 #define iscsi_session_attr_show(param, perm)                            \
3938 static ssize_t                                                          \
3939 show_session_param_##param(struct device *dev,                          \
3940                            struct device_attribute *attr, char *buf)    \
3941 {                                                                       \
3942         struct iscsi_cls_session *session =                             \
3943                 iscsi_dev_to_session(dev->parent);                      \
3944         struct iscsi_transport *t = session->transport;                 \
3945                                                                         \
3946         if (perm && !capable(CAP_SYS_ADMIN))                            \
3947                 return -EACCES;                                         \
3948         return t->get_session_param(session, param, buf);               \
3949 }
3950
3951 #define iscsi_session_attr(field, param, perm)                          \
3952         iscsi_session_attr_show(param, perm)                            \
3953 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3954                         NULL);
3955 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3956 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3957 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3958 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3959 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3960 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3961 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3962 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3963 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3964 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3965 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3966 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3967 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
3968 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
3969 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
3970 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
3971 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
3972 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
3973 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3974 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
3975 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3976 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
3977 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
3978 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
3979 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
3980 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
3981 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
3982 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
3983 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
3984 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
3985 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
3986 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
3987 iscsi_session_attr(discovery_auth_optional,
3988                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
3989 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
3990 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
3991 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
3992 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
3993 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
3994 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
3995 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
3996
3997 static ssize_t
3998 show_priv_session_state(struct device *dev, struct device_attribute *attr,
3999                         char *buf)
4000 {
4001         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4002         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
4003 }
4004 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4005                         NULL);
4006 static ssize_t
4007 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4008                         char *buf)
4009 {
4010         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4011         return sprintf(buf, "%d\n", session->creator);
4012 }
4013 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4014                         NULL);
4015 static ssize_t
4016 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4017                             char *buf)
4018 {
4019         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4020         return sprintf(buf, "%d\n", session->target_id);
4021 }
4022 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4023                         show_priv_session_target_id, NULL);
4024
4025 #define iscsi_priv_session_attr_show(field, format)                     \
4026 static ssize_t                                                          \
4027 show_priv_session_##field(struct device *dev,                           \
4028                           struct device_attribute *attr, char *buf)     \
4029 {                                                                       \
4030         struct iscsi_cls_session *session =                             \
4031                         iscsi_dev_to_session(dev->parent);              \
4032         if (session->field == -1)                                       \
4033                 return sprintf(buf, "off\n");                           \
4034         return sprintf(buf, format"\n", session->field);                \
4035 }
4036
4037 #define iscsi_priv_session_attr_store(field)                            \
4038 static ssize_t                                                          \
4039 store_priv_session_##field(struct device *dev,                          \
4040                            struct device_attribute *attr,               \
4041                            const char *buf, size_t count)               \
4042 {                                                                       \
4043         int val;                                                        \
4044         char *cp;                                                       \
4045         struct iscsi_cls_session *session =                             \
4046                 iscsi_dev_to_session(dev->parent);                      \
4047         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4048             (session->state == ISCSI_SESSION_FAILED))                   \
4049                 return -EBUSY;                                          \
4050         if (strncmp(buf, "off", 3) == 0)                                \
4051                 session->field = -1;                                    \
4052         else {                                                          \
4053                 val = simple_strtoul(buf, &cp, 0);                      \
4054                 if (*cp != '\0' && *cp != '\n')                         \
4055                         return -EINVAL;                                 \
4056                 session->field = val;                                   \
4057         }                                                               \
4058         return count;                                                   \
4059 }
4060
4061 #define iscsi_priv_session_rw_attr(field, format)                       \
4062         iscsi_priv_session_attr_show(field, format)                     \
4063         iscsi_priv_session_attr_store(field)                            \
4064 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4065                         show_priv_session_##field,                      \
4066                         store_priv_session_##field)
4067 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4068
4069 static struct attribute *iscsi_session_attrs[] = {
4070         &dev_attr_sess_initial_r2t.attr,
4071         &dev_attr_sess_max_outstanding_r2t.attr,
4072         &dev_attr_sess_immediate_data.attr,
4073         &dev_attr_sess_first_burst_len.attr,
4074         &dev_attr_sess_max_burst_len.attr,
4075         &dev_attr_sess_data_pdu_in_order.attr,
4076         &dev_attr_sess_data_seq_in_order.attr,
4077         &dev_attr_sess_erl.attr,
4078         &dev_attr_sess_targetname.attr,
4079         &dev_attr_sess_tpgt.attr,
4080         &dev_attr_sess_password.attr,
4081         &dev_attr_sess_password_in.attr,
4082         &dev_attr_sess_username.attr,
4083         &dev_attr_sess_username_in.attr,
4084         &dev_attr_sess_fast_abort.attr,
4085         &dev_attr_sess_abort_tmo.attr,
4086         &dev_attr_sess_lu_reset_tmo.attr,
4087         &dev_attr_sess_tgt_reset_tmo.attr,
4088         &dev_attr_sess_ifacename.attr,
4089         &dev_attr_sess_initiatorname.attr,
4090         &dev_attr_sess_targetalias.attr,
4091         &dev_attr_sess_boot_root.attr,
4092         &dev_attr_sess_boot_nic.attr,
4093         &dev_attr_sess_boot_target.attr,
4094         &dev_attr_priv_sess_recovery_tmo.attr,
4095         &dev_attr_priv_sess_state.attr,
4096         &dev_attr_priv_sess_creator.attr,
4097         &dev_attr_sess_chap_out_idx.attr,
4098         &dev_attr_sess_chap_in_idx.attr,
4099         &dev_attr_priv_sess_target_id.attr,
4100         &dev_attr_sess_auto_snd_tgt_disable.attr,
4101         &dev_attr_sess_discovery_session.attr,
4102         &dev_attr_sess_portal_type.attr,
4103         &dev_attr_sess_chap_auth.attr,
4104         &dev_attr_sess_discovery_logout.attr,
4105         &dev_attr_sess_bidi_chap.attr,
4106         &dev_attr_sess_discovery_auth_optional.attr,
4107         &dev_attr_sess_def_time2wait.attr,
4108         &dev_attr_sess_def_time2retain.attr,
4109         &dev_attr_sess_isid.attr,
4110         &dev_attr_sess_tsid.attr,
4111         &dev_attr_sess_def_taskmgmt_tmo.attr,
4112         &dev_attr_sess_discovery_parent_idx.attr,
4113         &dev_attr_sess_discovery_parent_type.attr,
4114         NULL,
4115 };
4116
4117 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4118                                             struct attribute *attr, int i)
4119 {
4120         struct device *cdev = container_of(kobj, struct device, kobj);
4121         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4122         struct iscsi_transport *t = session->transport;
4123         int param;
4124
4125         if (attr == &dev_attr_sess_initial_r2t.attr)
4126                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4127         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4128                 param = ISCSI_PARAM_MAX_R2T;
4129         else if (attr == &dev_attr_sess_immediate_data.attr)
4130                 param = ISCSI_PARAM_IMM_DATA_EN;
4131         else if (attr == &dev_attr_sess_first_burst_len.attr)
4132                 param = ISCSI_PARAM_FIRST_BURST;
4133         else if (attr == &dev_attr_sess_max_burst_len.attr)
4134                 param = ISCSI_PARAM_MAX_BURST;
4135         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4136                 param = ISCSI_PARAM_PDU_INORDER_EN;
4137         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4138                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4139         else if (attr == &dev_attr_sess_erl.attr)
4140                 param = ISCSI_PARAM_ERL;
4141         else if (attr == &dev_attr_sess_targetname.attr)
4142                 param = ISCSI_PARAM_TARGET_NAME;
4143         else if (attr == &dev_attr_sess_tpgt.attr)
4144                 param = ISCSI_PARAM_TPGT;
4145         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4146                 param = ISCSI_PARAM_CHAP_IN_IDX;
4147         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4148                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4149         else if (attr == &dev_attr_sess_password.attr)
4150                 param = ISCSI_PARAM_USERNAME;
4151         else if (attr == &dev_attr_sess_password_in.attr)
4152                 param = ISCSI_PARAM_USERNAME_IN;
4153         else if (attr == &dev_attr_sess_username.attr)
4154                 param = ISCSI_PARAM_PASSWORD;
4155         else if (attr == &dev_attr_sess_username_in.attr)
4156                 param = ISCSI_PARAM_PASSWORD_IN;
4157         else if (attr == &dev_attr_sess_fast_abort.attr)
4158                 param = ISCSI_PARAM_FAST_ABORT;
4159         else if (attr == &dev_attr_sess_abort_tmo.attr)
4160                 param = ISCSI_PARAM_ABORT_TMO;
4161         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4162                 param = ISCSI_PARAM_LU_RESET_TMO;
4163         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4164                 param = ISCSI_PARAM_TGT_RESET_TMO;
4165         else if (attr == &dev_attr_sess_ifacename.attr)
4166                 param = ISCSI_PARAM_IFACE_NAME;
4167         else if (attr == &dev_attr_sess_initiatorname.attr)
4168                 param = ISCSI_PARAM_INITIATOR_NAME;
4169         else if (attr == &dev_attr_sess_targetalias.attr)
4170                 param = ISCSI_PARAM_TARGET_ALIAS;
4171         else if (attr == &dev_attr_sess_boot_root.attr)
4172                 param = ISCSI_PARAM_BOOT_ROOT;
4173         else if (attr == &dev_attr_sess_boot_nic.attr)
4174                 param = ISCSI_PARAM_BOOT_NIC;
4175         else if (attr == &dev_attr_sess_boot_target.attr)
4176                 param = ISCSI_PARAM_BOOT_TARGET;
4177         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4178                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4179         else if (attr == &dev_attr_sess_discovery_session.attr)
4180                 param = ISCSI_PARAM_DISCOVERY_SESS;
4181         else if (attr == &dev_attr_sess_portal_type.attr)
4182                 param = ISCSI_PARAM_PORTAL_TYPE;
4183         else if (attr == &dev_attr_sess_chap_auth.attr)
4184                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4185         else if (attr == &dev_attr_sess_discovery_logout.attr)
4186                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4187         else if (attr == &dev_attr_sess_bidi_chap.attr)
4188                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4189         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4190                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4191         else if (attr == &dev_attr_sess_def_time2wait.attr)
4192                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4193         else if (attr == &dev_attr_sess_def_time2retain.attr)
4194                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4195         else if (attr == &dev_attr_sess_isid.attr)
4196                 param = ISCSI_PARAM_ISID;
4197         else if (attr == &dev_attr_sess_tsid.attr)
4198                 param = ISCSI_PARAM_TSID;
4199         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4200                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4201         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4202                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4203         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4204                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4205         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4206                 return S_IRUGO | S_IWUSR;
4207         else if (attr == &dev_attr_priv_sess_state.attr)
4208                 return S_IRUGO;
4209         else if (attr == &dev_attr_priv_sess_creator.attr)
4210                 return S_IRUGO;
4211         else if (attr == &dev_attr_priv_sess_target_id.attr)
4212                 return S_IRUGO;
4213         else {
4214                 WARN_ONCE(1, "Invalid session attr");
4215                 return 0;
4216         }
4217
4218         return t->attr_is_visible(ISCSI_PARAM, param);
4219 }
4220
4221 static struct attribute_group iscsi_session_group = {
4222         .attrs = iscsi_session_attrs,
4223         .is_visible = iscsi_session_attr_is_visible,
4224 };
4225
4226 /*
4227  * iSCSI host attrs
4228  */
4229 #define iscsi_host_attr_show(param)                                     \
4230 static ssize_t                                                          \
4231 show_host_param_##param(struct device *dev,                             \
4232                         struct device_attribute *attr, char *buf)       \
4233 {                                                                       \
4234         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4235         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4236         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4237 }
4238
4239 #define iscsi_host_attr(field, param)                                   \
4240         iscsi_host_attr_show(param)                                     \
4241 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4242                         NULL);
4243
4244 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4245 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4246 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4247 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4248 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4249 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4250
4251 static struct attribute *iscsi_host_attrs[] = {
4252         &dev_attr_host_netdev.attr,
4253         &dev_attr_host_hwaddress.attr,
4254         &dev_attr_host_ipaddress.attr,
4255         &dev_attr_host_initiatorname.attr,
4256         &dev_attr_host_port_state.attr,
4257         &dev_attr_host_port_speed.attr,
4258         NULL,
4259 };
4260
4261 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4262                                          struct attribute *attr, int i)
4263 {
4264         struct device *cdev = container_of(kobj, struct device, kobj);
4265         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4266         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4267         int param;
4268
4269         if (attr == &dev_attr_host_netdev.attr)
4270                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4271         else if (attr == &dev_attr_host_hwaddress.attr)
4272                 param = ISCSI_HOST_PARAM_HWADDRESS;
4273         else if (attr == &dev_attr_host_ipaddress.attr)
4274                 param = ISCSI_HOST_PARAM_IPADDRESS;
4275         else if (attr == &dev_attr_host_initiatorname.attr)
4276                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4277         else if (attr == &dev_attr_host_port_state.attr)
4278                 param = ISCSI_HOST_PARAM_PORT_STATE;
4279         else if (attr == &dev_attr_host_port_speed.attr)
4280                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4281         else {
4282                 WARN_ONCE(1, "Invalid host attr");
4283                 return 0;
4284         }
4285
4286         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4287 }
4288
4289 static struct attribute_group iscsi_host_group = {
4290         .attrs = iscsi_host_attrs,
4291         .is_visible = iscsi_host_attr_is_visible,
4292 };
4293
4294 /* convert iscsi_port_speed values to ascii string name */
4295 static const struct {
4296         enum iscsi_port_speed   value;
4297         char                    *name;
4298 } iscsi_port_speed_names[] = {
4299         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4300         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4301         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4302         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4303         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4304 };
4305
4306 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4307 {
4308         int i;
4309         char *speed = "Unknown!";
4310         struct iscsi_cls_host *ihost = shost->shost_data;
4311         uint32_t port_speed = ihost->port_speed;
4312
4313         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4314                 if (iscsi_port_speed_names[i].value & port_speed) {
4315                         speed = iscsi_port_speed_names[i].name;
4316                         break;
4317                 }
4318         }
4319         return speed;
4320 }
4321 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4322
4323 /* convert iscsi_port_state values to ascii string name */
4324 static const struct {
4325         enum iscsi_port_state   value;
4326         char                    *name;
4327 } iscsi_port_state_names[] = {
4328         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4329         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4330 };
4331
4332 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4333 {
4334         int i;
4335         char *state = "Unknown!";
4336         struct iscsi_cls_host *ihost = shost->shost_data;
4337         uint32_t port_state = ihost->port_state;
4338
4339         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4340                 if (iscsi_port_state_names[i].value & port_state) {
4341                         state = iscsi_port_state_names[i].name;
4342                         break;
4343                 }
4344         }
4345         return state;
4346 }
4347 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4348
4349 static int iscsi_session_match(struct attribute_container *cont,
4350                            struct device *dev)
4351 {
4352         struct iscsi_cls_session *session;
4353         struct Scsi_Host *shost;
4354         struct iscsi_internal *priv;
4355
4356         if (!iscsi_is_session_dev(dev))
4357                 return 0;
4358
4359         session = iscsi_dev_to_session(dev);
4360         shost = iscsi_session_to_shost(session);
4361         if (!shost->transportt)
4362                 return 0;
4363
4364         priv = to_iscsi_internal(shost->transportt);
4365         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4366                 return 0;
4367
4368         return &priv->session_cont.ac == cont;
4369 }
4370
4371 static int iscsi_conn_match(struct attribute_container *cont,
4372                            struct device *dev)
4373 {
4374         struct iscsi_cls_session *session;
4375         struct iscsi_cls_conn *conn;
4376         struct Scsi_Host *shost;
4377         struct iscsi_internal *priv;
4378
4379         if (!iscsi_is_conn_dev(dev))
4380                 return 0;
4381
4382         conn = iscsi_dev_to_conn(dev);
4383         session = iscsi_dev_to_session(conn->dev.parent);
4384         shost = iscsi_session_to_shost(session);
4385
4386         if (!shost->transportt)
4387                 return 0;
4388
4389         priv = to_iscsi_internal(shost->transportt);
4390         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4391                 return 0;
4392
4393         return &priv->conn_cont.ac == cont;
4394 }
4395
4396 static int iscsi_host_match(struct attribute_container *cont,
4397                             struct device *dev)
4398 {
4399         struct Scsi_Host *shost;
4400         struct iscsi_internal *priv;
4401
4402         if (!scsi_is_host_device(dev))
4403                 return 0;
4404
4405         shost = dev_to_shost(dev);
4406         if (!shost->transportt  ||
4407             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4408                 return 0;
4409
4410         priv = to_iscsi_internal(shost->transportt);
4411         return &priv->t.host_attrs.ac == cont;
4412 }
4413
4414 struct scsi_transport_template *
4415 iscsi_register_transport(struct iscsi_transport *tt)
4416 {
4417         struct iscsi_internal *priv;
4418         unsigned long flags;
4419         int err;
4420
4421         BUG_ON(!tt);
4422
4423         priv = iscsi_if_transport_lookup(tt);
4424         if (priv)
4425                 return NULL;
4426
4427         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4428         if (!priv)
4429                 return NULL;
4430         INIT_LIST_HEAD(&priv->list);
4431         priv->iscsi_transport = tt;
4432         priv->t.user_scan = iscsi_user_scan;
4433         priv->t.create_work_queue = 1;
4434
4435         priv->dev.class = &iscsi_transport_class;
4436         dev_set_name(&priv->dev, "%s", tt->name);
4437         err = device_register(&priv->dev);
4438         if (err)
4439                 goto free_priv;
4440
4441         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4442         if (err)
4443                 goto unregister_dev;
4444
4445         /* host parameters */
4446         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4447         priv->t.host_attrs.ac.match = iscsi_host_match;
4448         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4449         priv->t.host_size = sizeof(struct iscsi_cls_host);
4450         transport_container_register(&priv->t.host_attrs);
4451
4452         /* connection parameters */
4453         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4454         priv->conn_cont.ac.match = iscsi_conn_match;
4455         priv->conn_cont.ac.grp = &iscsi_conn_group;
4456         transport_container_register(&priv->conn_cont);
4457
4458         /* session parameters */
4459         priv->session_cont.ac.class = &iscsi_session_class.class;
4460         priv->session_cont.ac.match = iscsi_session_match;
4461         priv->session_cont.ac.grp = &iscsi_session_group;
4462         transport_container_register(&priv->session_cont);
4463
4464         spin_lock_irqsave(&iscsi_transport_lock, flags);
4465         list_add(&priv->list, &iscsi_transports);
4466         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4467
4468         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4469         return &priv->t;
4470
4471 unregister_dev:
4472         device_unregister(&priv->dev);
4473         return NULL;
4474 free_priv:
4475         kfree(priv);
4476         return NULL;
4477 }
4478 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4479
4480 int iscsi_unregister_transport(struct iscsi_transport *tt)
4481 {
4482         struct iscsi_internal *priv;
4483         unsigned long flags;
4484
4485         BUG_ON(!tt);
4486
4487         mutex_lock(&rx_queue_mutex);
4488
4489         priv = iscsi_if_transport_lookup(tt);
4490         BUG_ON (!priv);
4491
4492         spin_lock_irqsave(&iscsi_transport_lock, flags);
4493         list_del(&priv->list);
4494         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4495
4496         transport_container_unregister(&priv->conn_cont);
4497         transport_container_unregister(&priv->session_cont);
4498         transport_container_unregister(&priv->t.host_attrs);
4499
4500         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4501         device_unregister(&priv->dev);
4502         mutex_unlock(&rx_queue_mutex);
4503
4504         return 0;
4505 }
4506 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4507
4508 static __init int iscsi_transport_init(void)
4509 {
4510         int err;
4511         struct netlink_kernel_cfg cfg = {
4512                 .groups = 1,
4513                 .input  = iscsi_if_rx,
4514         };
4515         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4516                 ISCSI_TRANSPORT_VERSION);
4517
4518         atomic_set(&iscsi_session_nr, 0);
4519
4520         err = class_register(&iscsi_transport_class);
4521         if (err)
4522                 return err;
4523
4524         err = class_register(&iscsi_endpoint_class);
4525         if (err)
4526                 goto unregister_transport_class;
4527
4528         err = class_register(&iscsi_iface_class);
4529         if (err)
4530                 goto unregister_endpoint_class;
4531
4532         err = transport_class_register(&iscsi_host_class);
4533         if (err)
4534                 goto unregister_iface_class;
4535
4536         err = transport_class_register(&iscsi_connection_class);
4537         if (err)
4538                 goto unregister_host_class;
4539
4540         err = transport_class_register(&iscsi_session_class);
4541         if (err)
4542                 goto unregister_conn_class;
4543
4544         err = bus_register(&iscsi_flashnode_bus);
4545         if (err)
4546                 goto unregister_session_class;
4547
4548         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4549         if (!nls) {
4550                 err = -ENOBUFS;
4551                 goto unregister_flashnode_bus;
4552         }
4553
4554         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4555         if (!iscsi_eh_timer_workq) {
4556                 err = -ENOMEM;
4557                 goto release_nls;
4558         }
4559
4560         return 0;
4561
4562 release_nls:
4563         netlink_kernel_release(nls);
4564 unregister_flashnode_bus:
4565         bus_unregister(&iscsi_flashnode_bus);
4566 unregister_session_class:
4567         transport_class_unregister(&iscsi_session_class);
4568 unregister_conn_class:
4569         transport_class_unregister(&iscsi_connection_class);
4570 unregister_host_class:
4571         transport_class_unregister(&iscsi_host_class);
4572 unregister_iface_class:
4573         class_unregister(&iscsi_iface_class);
4574 unregister_endpoint_class:
4575         class_unregister(&iscsi_endpoint_class);
4576 unregister_transport_class:
4577         class_unregister(&iscsi_transport_class);
4578         return err;
4579 }
4580
4581 static void __exit iscsi_transport_exit(void)
4582 {
4583         destroy_workqueue(iscsi_eh_timer_workq);
4584         netlink_kernel_release(nls);
4585         bus_unregister(&iscsi_flashnode_bus);
4586         transport_class_unregister(&iscsi_connection_class);
4587         transport_class_unregister(&iscsi_session_class);
4588         transport_class_unregister(&iscsi_host_class);
4589         class_unregister(&iscsi_endpoint_class);
4590         class_unregister(&iscsi_iface_class);
4591         class_unregister(&iscsi_transport_class);
4592 }
4593
4594 module_init(iscsi_transport_init);
4595 module_exit(iscsi_transport_exit);
4596
4597 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4598               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4599               "Alex Aizman <itn780@yahoo.com>");
4600 MODULE_DESCRIPTION("iSCSI Transport Interface");
4601 MODULE_LICENSE("GPL");
4602 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4603 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);