kernel/drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010-2015 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <net/ipv6.h>
  28 #include <net/ip6_route.h>
  29 #include <net/addrconf.h>
  30
  31 #include <linux/inetdevice.h>   /* ip_dev_find */
  32 #include <linux/module.h>
  33 #include <net/tcp.h>
  34
  35 static unsigned int dbg_level;
  36
  37 #include "libcxgbi.h"
  38
  39 #define DRV_MODULE_NAME         "libcxgbi"
  40 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  41 #define DRV_MODULE_VERSION      "0.9.1-ko"
  42 #define DRV_MODULE_RELDATE      "Apr. 2015"
  43
  44 static char version[] =
  45         DRV_MODULE_DESC " " DRV_MODULE_NAME
  46         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  47
  48 MODULE_AUTHOR("Chelsio Communications, Inc.");
  49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  50 MODULE_VERSION(DRV_MODULE_VERSION);
  51 MODULE_LICENSE("GPL");
  52
  53 module_param(dbg_level, uint, 0644);
  54 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  55
  56
  57 /*
  58  * cxgbi device management
  59  * maintains a list of the cxgbi devices
  60  */
  61 static LIST_HEAD(cdev_list);
  62 static DEFINE_MUTEX(cdev_mutex);
  63
  64 static LIST_HEAD(cdev_rcu_list);
  65 static DEFINE_SPINLOCK(cdev_rcu_lock);
  66
  67 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  68                                 unsigned int max_conn)
  69 {
  70         struct cxgbi_ports_map *pmap = &cdev->pmap;
  71
  72         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  73                                              sizeof(struct cxgbi_sock *),
  74                                              GFP_KERNEL);
  75         if (!pmap->port_csk) {
  76                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  77                 return -ENOMEM;
  78         }
  79
  80         pmap->max_connect = max_conn;
  81         pmap->sport_base = base;
  82         spin_lock_init(&pmap->lock);
  83         return 0;
  84 }
  85 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  86
  87 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  88 {
  89         struct cxgbi_ports_map *pmap = &cdev->pmap;
  90         struct cxgbi_sock *csk;
  91         int i;
  92
  93         for (i = 0; i < pmap->max_connect; i++) {
  94                 if (pmap->port_csk[i]) {
  95                         csk = pmap->port_csk[i];
  96                         pmap->port_csk[i] = NULL;
  97                         log_debug(1 << CXGBI_DBG_SOCK,
  98                                 "csk 0x%p, cdev 0x%p, offload down.\n",
  99                                 csk, cdev);
 100                         spin_lock_bh(&csk->lock);
 101                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
 102                         cxgbi_sock_closed(csk);
 103                         spin_unlock_bh(&csk->lock);
 104                         cxgbi_sock_put(csk);
 105                 }
 106         }
 107 }
 108 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 109
 110 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 111 {
 112         log_debug(1 << CXGBI_DBG_DEV,
 113                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 114         cxgbi_hbas_remove(cdev);
 115         cxgbi_device_portmap_cleanup(cdev);
 116         if (cdev->dev_ddp_cleanup)
 117                 cdev->dev_ddp_cleanup(cdev);
 118         else
 119                 cxgbi_ddp_cleanup(cdev);
 120         if (cdev->ddp)
 121                 cxgbi_ddp_cleanup(cdev);
 122         if (cdev->pmap.max_connect)
 123                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 124         kfree(cdev);
 125 }
 126
 127 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 128                                            unsigned int nports)
 129 {
 130         struct cxgbi_device *cdev;
 131
 132         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 133                         (sizeof(struct cxgbi_hba *) +
 134                          sizeof(struct net_device *)),
 135                         GFP_KERNEL);
 136         if (!cdev) {
 137                 pr_warn("nport %d, OOM.\n", nports);
 138                 return NULL;
 139         }
 140         cdev->ports = (struct net_device **)(cdev + 1);
 141         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 142                                                 sizeof(struct net_device *));
 143         if (extra)
 144                 cdev->dd_data = ((char *)cdev->hbas) +
 145                                 nports * sizeof(struct cxgbi_hba *);
 146         spin_lock_init(&cdev->pmap.lock);
 147
 148         mutex_lock(&cdev_mutex);
 149         list_add_tail(&cdev->list_head, &cdev_list);
 150         mutex_unlock(&cdev_mutex);
 151
 152         spin_lock(&cdev_rcu_lock);
 153         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 154         spin_unlock(&cdev_rcu_lock);
 155
 156         log_debug(1 << CXGBI_DBG_DEV,
 157                 "cdev 0x%p, p# %u.\n", cdev, nports);
 158         return cdev;
 159 }
 160 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 161
 162 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 163 {
 164         log_debug(1 << CXGBI_DBG_DEV,
 165                 "cdev 0x%p, p# %u,%s.\n",
 166                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 167
 168         mutex_lock(&cdev_mutex);
 169         list_del(&cdev->list_head);
 170         mutex_unlock(&cdev_mutex);
 171
 172         spin_lock(&cdev_rcu_lock);
 173         list_del_rcu(&cdev->rcu_node);
 174         spin_unlock(&cdev_rcu_lock);
 175         synchronize_rcu();
 176
 177         cxgbi_device_destroy(cdev);
 178 }
 179 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 180
 181 void cxgbi_device_unregister_all(unsigned int flag)
 182 {
 183         struct cxgbi_device *cdev, *tmp;
 184
 185         mutex_lock(&cdev_mutex);
 186         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 187                 if ((cdev->flags & flag) == flag) {
 188                         mutex_unlock(&cdev_mutex);
 189                         cxgbi_device_unregister(cdev);
 190                         mutex_lock(&cdev_mutex);
 191                 }
 192         }
 193         mutex_unlock(&cdev_mutex);
 194 }
 195 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 196
 197 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 198 {
 199         struct cxgbi_device *cdev, *tmp;
 200
 201         mutex_lock(&cdev_mutex);
 202         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 203                 if (cdev->lldev == lldev) {
 204                         mutex_unlock(&cdev_mutex);
 205                         return cdev;
 206                 }
 207         }
 208         mutex_unlock(&cdev_mutex);
 209
 210         log_debug(1 << CXGBI_DBG_DEV,
 211                 "lldev 0x%p, NO match found.\n", lldev);
 212         return NULL;
 213 }
 214 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 215
 216 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 217                                                  int *port)
 218 {
 219         struct net_device *vdev = NULL;
 220         struct cxgbi_device *cdev, *tmp;
 221         int i;
 222
 223         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 224                 vdev = ndev;
 225                 ndev = vlan_dev_real_dev(ndev);
 226                 log_debug(1 << CXGBI_DBG_DEV,
 227                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 228         }
 229
 230         mutex_lock(&cdev_mutex);
 231         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 232                 for (i = 0; i < cdev->nports; i++) {
 233                         if (ndev == cdev->ports[i]) {
 234                                 cdev->hbas[i]->vdev = vdev;
 235                                 mutex_unlock(&cdev_mutex);
 236                                 if (port)
 237                                         *port = i;
 238                                 return cdev;
 239                         }
 240                 }
 241         }
 242         mutex_unlock(&cdev_mutex);
 243         log_debug(1 << CXGBI_DBG_DEV,
 244                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 245         return NULL;
 246 }
 247 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 248
 249 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 250                                                      int *port)
 251 {
 252         struct net_device *vdev = NULL;
 253         struct cxgbi_device *cdev;
 254         int i;
 255
 256         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 257                 vdev = ndev;
 258                 ndev = vlan_dev_real_dev(ndev);
 259                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 260         }
 261
 262         rcu_read_lock();
 263         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 264                 for (i = 0; i < cdev->nports; i++) {
 265                         if (ndev == cdev->ports[i]) {
 266                                 cdev->hbas[i]->vdev = vdev;
 267                                 rcu_read_unlock();
 268                                 if (port)
 269                                         *port = i;
 270                                 return cdev;
 271                         }
 272                 }
 273         }
 274         rcu_read_unlock();
 275
 276         log_debug(1 << CXGBI_DBG_DEV,
 277                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 278         return NULL;
 279 }
 280 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 281
 282 #if IS_ENABLED(CONFIG_IPV6)
 283 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 284                                                      int *port)
 285 {
 286         struct net_device *vdev = NULL;
 287         struct cxgbi_device *cdev, *tmp;
 288         int i;
 289
 290         if (ndev->priv_flags & IFF_802_1Q_VLAN) {
 291                 vdev = ndev;
 292                 ndev = vlan_dev_real_dev(ndev);
 293                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 294         }
 295
 296         mutex_lock(&cdev_mutex);
 297         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 298                 for (i = 0; i < cdev->nports; i++) {
 299                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 300                                     MAX_ADDR_LEN)) {
 301                                 cdev->hbas[i]->vdev = vdev;
 302                                 mutex_unlock(&cdev_mutex);
 303                                 if (port)
 304                                         *port = i;
 305                                 return cdev;
 306                         }
 307                 }
 308         }
 309         mutex_unlock(&cdev_mutex);
 310         log_debug(1 << CXGBI_DBG_DEV,
 311                   "ndev 0x%p, %s, NO match mac found.\n",
 312                   ndev, ndev->name);
 313         return NULL;
 314 }
 315 #endif
 316
 317 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 318 {
 319         int i;
 320         struct cxgbi_hba *chba;
 321
 322         log_debug(1 << CXGBI_DBG_DEV,
 323                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 324
 325         for (i = 0; i < cdev->nports; i++) {
 326                 chba = cdev->hbas[i];
 327                 if (chba) {
 328                         cdev->hbas[i] = NULL;
 329                         iscsi_host_remove(chba->shost);
 330                         pci_dev_put(cdev->pdev);
 331                         iscsi_host_free(chba->shost);
 332                 }
 333         }
 334 }
 335 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 336
 337 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 338                 unsigned int max_id, struct scsi_host_template *sht,
 339                 struct scsi_transport_template *stt)
 340 {
 341         struct cxgbi_hba *chba;
 342         struct Scsi_Host *shost;
 343         int i, err;
 344
 345         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 346
 347         for (i = 0; i < cdev->nports; i++) {
 348                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 349                 if (!shost) {
 350                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 351                                 cdev, i, cdev->ports[i]->name);
 352                         err = -ENOMEM;
 353                         goto err_out;
 354                 }
 355
 356                 shost->transportt = stt;
 357                 shost->max_lun = max_lun;
 358                 shost->max_id = max_id;
 359                 shost->max_channel = 0;
 360                 shost->max_cmd_len = 16;
 361
 362                 chba = iscsi_host_priv(shost);
 363                 chba->cdev = cdev;
 364                 chba->ndev = cdev->ports[i];
 365                 chba->shost = shost;
 366
 367                 log_debug(1 << CXGBI_DBG_DEV,
 368                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 369                         cdev, i, cdev->ports[i]->name, chba);
 370
 371                 pci_dev_get(cdev->pdev);
 372                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 373                 if (err) {
 374                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 375                                 cdev, i, cdev->ports[i]->name);
 376                         pci_dev_put(cdev->pdev);
 377                         scsi_host_put(shost);
 378                         goto  err_out;
 379                 }
 380
 381                 cdev->hbas[i] = chba;
 382         }
 383
 384         return 0;
 385
 386 err_out:
 387         cxgbi_hbas_remove(cdev);
 388         return err;
 389 }
 390 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 391
 392 /*
 393  * iSCSI offload
 394  *
 395  * - source port management
 396  *   To find a free source port in the port allocation map we use a very simple
 397  *   rotor scheme to look for the next free port.
 398  *
 399  *   If a source port has been specified make sure that it doesn't collide with
 400  *   our normal source port allocation map.  If it's outside the range of our
 401  *   allocation/deallocation scheme just let them use it.
 402  *
 403  *   If the source port is outside our allocation range, the caller is
 404  *   responsible for keeping track of their port usage.
 405  */
 406
 407 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 408                                             unsigned char port_id)
 409 {
 410         struct cxgbi_ports_map *pmap = &cdev->pmap;
 411         unsigned int i;
 412         unsigned int used;
 413
 414         if (!pmap->max_connect || !pmap->used)
 415                 return NULL;
 416
 417         spin_lock_bh(&pmap->lock);
 418         used = pmap->used;
 419         for (i = 0; used && i < pmap->max_connect; i++) {
 420                 struct cxgbi_sock *csk = pmap->port_csk[i];
 421
 422                 if (csk) {
 423                         if (csk->port_id == port_id) {
 424                                 spin_unlock_bh(&pmap->lock);
 425                                 return csk;
 426                         }
 427                         used--;
 428                 }
 429         }
 430         spin_unlock_bh(&pmap->lock);
 431
 432         return NULL;
 433 }
 434
 435 static int sock_get_port(struct cxgbi_sock *csk)
 436 {
 437         struct cxgbi_device *cdev = csk->cdev;
 438         struct cxgbi_ports_map *pmap = &cdev->pmap;
 439         unsigned int start;
 440         int idx;
 441         __be16 *port;
 442
 443         if (!pmap->max_connect) {
 444                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 445                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 446                 return -EADDRNOTAVAIL;
 447         }
 448
 449         if (csk->csk_family == AF_INET)
 450                 port = &csk->saddr.sin_port;
 451         else /* ipv6 */
 452                 port = &csk->saddr6.sin6_port;
 453
 454         if (*port) {
 455                 pr_err("source port NON-ZERO %u.\n",
 456                         ntohs(*port));
 457                 return -EADDRINUSE;
 458         }
 459
 460         spin_lock_bh(&pmap->lock);
 461         if (pmap->used >= pmap->max_connect) {
 462                 spin_unlock_bh(&pmap->lock);
 463                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 464                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 465                 return -EADDRNOTAVAIL;
 466         }
 467
 468         start = idx = pmap->next;
 469         do {
 470                 if (++idx >= pmap->max_connect)
 471                         idx = 0;
 472                 if (!pmap->port_csk[idx]) {
 473                         pmap->used++;
 474                         *port = htons(pmap->sport_base + idx);
 475                         pmap->next = idx;
 476                         pmap->port_csk[idx] = csk;
 477                         spin_unlock_bh(&pmap->lock);
 478                         cxgbi_sock_get(csk);
 479                         log_debug(1 << CXGBI_DBG_SOCK,
 480                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 481                                 cdev, csk->port_id,
 482                                 cdev->ports[csk->port_id]->name,
 483                                 pmap->sport_base + idx, pmap->next);
 484                         return 0;
 485                 }
 486         } while (idx != start);
 487         spin_unlock_bh(&pmap->lock);
 488
 489         /* should not happen */
 490         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 491                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 492                 pmap->next);
 493         return -EADDRNOTAVAIL;
 494 }
 495
 496 static void sock_put_port(struct cxgbi_sock *csk)
 497 {
 498         struct cxgbi_device *cdev = csk->cdev;
 499         struct cxgbi_ports_map *pmap = &cdev->pmap;
 500         __be16 *port;
 501
 502         if (csk->csk_family == AF_INET)
 503                 port = &csk->saddr.sin_port;
 504         else /* ipv6 */
 505                 port = &csk->saddr6.sin6_port;
 506
 507         if (*port) {
 508                 int idx = ntohs(*port) - pmap->sport_base;
 509
 510                 *port = 0;
 511                 if (idx < 0 || idx >= pmap->max_connect) {
 512                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 513                                 cdev, csk->port_id,
 514                                 cdev->ports[csk->port_id]->name,
 515                                 ntohs(*port));
 516                         return;
 517                 }
 518
 519                 spin_lock_bh(&pmap->lock);
 520                 pmap->port_csk[idx] = NULL;
 521                 pmap->used--;
 522                 spin_unlock_bh(&pmap->lock);
 523
 524                 log_debug(1 << CXGBI_DBG_SOCK,
 525                         "cdev 0x%p, p#%u %s, release %u.\n",
 526                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 527                         pmap->sport_base + idx);
 528
 529                 cxgbi_sock_put(csk);
 530         }
 531 }
 532
 533 /*
 534  * iscsi tcp connection
 535  */
 536 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 537 {
 538         if (csk->cpl_close) {
 539                 kfree_skb(csk->cpl_close);
 540                 csk->cpl_close = NULL;
 541         }
 542         if (csk->cpl_abort_req) {
 543                 kfree_skb(csk->cpl_abort_req);
 544                 csk->cpl_abort_req = NULL;
 545         }
 546         if (csk->cpl_abort_rpl) {
 547                 kfree_skb(csk->cpl_abort_rpl);
 548                 csk->cpl_abort_rpl = NULL;
 549         }
 550 }
 551 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 552
 553 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 554 {
 555         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 556
 557         if (!csk) {
 558                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 559                 return NULL;
 560         }
 561
 562         if (cdev->csk_alloc_cpls(csk) < 0) {
 563                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 564                 kfree(csk);
 565                 return NULL;
 566         }
 567
 568         spin_lock_init(&csk->lock);
 569         kref_init(&csk->refcnt);
 570         skb_queue_head_init(&csk->receive_queue);
 571         skb_queue_head_init(&csk->write_queue);
 572         setup_timer(&csk->retry_timer, NULL, (unsigned long)csk);
 573         rwlock_init(&csk->callback_lock);
 574         csk->cdev = cdev;
 575         csk->flags = 0;
 576         cxgbi_sock_set_state(csk, CTP_CLOSED);
 577
 578         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 579
 580         return csk;
 581 }
 582
 583 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 584                                       __be32 saddr, __be32 daddr,
 585                                       __be16 sport, __be16 dport, u8 tos)
 586 {
 587         struct rtable *rt;
 588
 589         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 590                                    dport, sport, IPPROTO_TCP, tos, 0);
 591         if (IS_ERR(rt))
 592                 return NULL;
 593
 594         return rt;
 595 }
 596
 597 static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
 598 {
 599         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 600         struct dst_entry *dst;
 601         struct net_device *ndev;
 602         struct cxgbi_device *cdev;
 603         struct rtable *rt = NULL;
 604         struct neighbour *n;
 605         struct flowi4 fl4;
 606         struct cxgbi_sock *csk = NULL;
 607         unsigned int mtu = 0;
 608         int port = 0xFFFF;
 609         int err = 0;
 610
 611         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0, daddr->sin_port, 0);
 612         if (!rt) {
 613                 pr_info("no route to ipv4 0x%x, port %u.\n",
 614                         be32_to_cpu(daddr->sin_addr.s_addr),
 615                         be16_to_cpu(daddr->sin_port));
 616                 err = -ENETUNREACH;
 617                 goto err_out;
 618         }
 619         dst = &rt->dst;
 620         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 621         if (!n) {
 622                 err = -ENODEV;
 623                 goto rel_rt;
 624         }
 625         ndev = n->dev;
 626
 627         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 628                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 629                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 630                         ndev->name);
 631                 err = -ENETUNREACH;
 632                 goto rel_neigh;
 633         }
 634
 635         if (ndev->flags & IFF_LOOPBACK) {
 636                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 637                 mtu = ndev->mtu;
 638                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 639                         n->dev->name, ndev->name, mtu);
 640         }
 641
 642         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 643         if (!cdev) {
 644                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 645                         &daddr->sin_addr.s_addr, ndev->name);
 646                 err = -ENETUNREACH;
 647                 goto rel_neigh;
 648         }
 649         log_debug(1 << CXGBI_DBG_SOCK,
 650                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 651                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 652                            port, ndev->name, cdev);
 653
 654         csk = cxgbi_sock_create(cdev);
 655         if (!csk) {
 656                 err = -ENOMEM;
 657                 goto rel_neigh;
 658         }
 659         csk->cdev = cdev;
 660         csk->port_id = port;
 661         csk->mtu = mtu;
 662         csk->dst = dst;
 663
 664         csk->csk_family = AF_INET;
 665         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 666         csk->daddr.sin_port = daddr->sin_port;
 667         csk->daddr.sin_family = daddr->sin_family;
 668         csk->saddr.sin_family = daddr->sin_family;
 669         csk->saddr.sin_addr.s_addr = fl4.saddr;
 670         neigh_release(n);
 671
 672         return csk;
 673
 674 rel_neigh:
 675         neigh_release(n);
 676
 677 rel_rt:
 678         ip_rt_put(rt);
 679         if (csk)
 680                 cxgbi_sock_closed(csk);
 681 err_out:
 682         return ERR_PTR(err);
 683 }
 684
 685 #if IS_ENABLED(CONFIG_IPV6)
 686 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 687                                         const struct in6_addr *daddr)
 688 {
 689         struct flowi6 fl;
 690
 691         if (saddr)
 692                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 693         if (daddr)
 694                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 695         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 696 }
 697
 698 static struct cxgbi_sock *cxgbi_check_route6(struct sockaddr *dst_addr)
 699 {
 700         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 701         struct dst_entry *dst;
 702         struct net_device *ndev;
 703         struct cxgbi_device *cdev;
 704         struct rt6_info *rt = NULL;
 705         struct neighbour *n;
 706         struct in6_addr pref_saddr;
 707         struct cxgbi_sock *csk = NULL;
 708         unsigned int mtu = 0;
 709         int port = 0xFFFF;
 710         int err = 0;
 711
 712         rt = find_route_ipv6(NULL, &daddr6->sin6_addr);
 713
 714         if (!rt) {
 715                 pr_info("no route to ipv6 %pI6 port %u\n",
 716                         daddr6->sin6_addr.s6_addr,
 717                         be16_to_cpu(daddr6->sin6_port));
 718                 err = -ENETUNREACH;
 719                 goto err_out;
 720         }
 721
 722         dst = &rt->dst;
 723
 724         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 725
 726         if (!n) {
 727                 pr_info("%pI6, port %u, dst no neighbour.\n",
 728                         daddr6->sin6_addr.s6_addr,
 729                         be16_to_cpu(daddr6->sin6_port));
 730                 err = -ENETUNREACH;
 731                 goto rel_rt;
 732         }
 733         ndev = n->dev;
 734
 735         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 736                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 737                         daddr6->sin6_addr.s6_addr,
 738                         ntohs(daddr6->sin6_port), ndev->name);
 739                 err = -ENETUNREACH;
 740                 goto rel_rt;
 741         }
 742
 743         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 744         if (!cdev)
 745                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 746         if (!cdev) {
 747                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 748                         daddr6->sin6_addr.s6_addr, ndev->name);
 749                 err = -ENETUNREACH;
 750                 goto rel_rt;
 751         }
 752         log_debug(1 << CXGBI_DBG_SOCK,
 753                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 754                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 755                   ndev->name, cdev);
 756
 757         csk = cxgbi_sock_create(cdev);
 758         if (!csk) {
 759                 err = -ENOMEM;
 760                 goto rel_rt;
 761         }
 762         csk->cdev = cdev;
 763         csk->port_id = port;
 764         csk->mtu = mtu;
 765         csk->dst = dst;
 766
 767         if (ipv6_addr_any(&rt->rt6i_prefsrc.addr)) {
 768                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 769
 770                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 771                                          &daddr6->sin6_addr, 0, &pref_saddr);
 772                 if (err) {
 773                         pr_info("failed to get source address to reach %pI6\n",
 774                                 &daddr6->sin6_addr);
 775                         goto rel_rt;
 776                 }
 777         } else {
 778                 pref_saddr = rt->rt6i_prefsrc.addr;
 779         }
 780
 781         csk->csk_family = AF_INET6;
 782         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 783         csk->daddr6.sin6_port = daddr6->sin6_port;
 784         csk->daddr6.sin6_family = daddr6->sin6_family;
 785         csk->saddr6.sin6_family = daddr6->sin6_family;
 786         csk->saddr6.sin6_addr = pref_saddr;
 787
 788         neigh_release(n);
 789         return csk;
 790
 791 rel_rt:
 792         if (n)
 793                 neigh_release(n);
 794
 795         ip6_rt_put(rt);
 796         if (csk)
 797                 cxgbi_sock_closed(csk);
 798 err_out:
 799         return ERR_PTR(err);
 800 }
 801 #endif /* IS_ENABLED(CONFIG_IPV6) */
 802
 803 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 804                         unsigned int opt)
 805 {
 806         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 807         dst_confirm(csk->dst);
 808         smp_mb();
 809         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 810 }
 811 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 812
 813 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 814 {
 815         log_debug(1 << CXGBI_DBG_SOCK,
 816                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 817                 csk, csk->state, csk->flags, csk->user_data);
 818
 819         if (csk->state != CTP_ESTABLISHED) {
 820                 read_lock_bh(&csk->callback_lock);
 821                 if (csk->user_data)
 822                         iscsi_conn_failure(csk->user_data,
 823                                         ISCSI_ERR_TCP_CONN_CLOSE);
 824                 read_unlock_bh(&csk->callback_lock);
 825         }
 826 }
 827
 828 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 829 {
 830         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 831                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 832         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 833         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 834                 return;
 835         if (csk->saddr.sin_port)
 836                 sock_put_port(csk);
 837         if (csk->dst)
 838                 dst_release(csk->dst);
 839         csk->cdev->csk_release_offload_resources(csk);
 840         cxgbi_sock_set_state(csk, CTP_CLOSED);
 841         cxgbi_inform_iscsi_conn_closing(csk);
 842         cxgbi_sock_put(csk);
 843 }
 844 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 845
 846 static void need_active_close(struct cxgbi_sock *csk)
 847 {
 848         int data_lost;
 849         int close_req = 0;
 850
 851         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 852                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 853         spin_lock_bh(&csk->lock);
 854         dst_confirm(csk->dst);
 855         data_lost = skb_queue_len(&csk->receive_queue);
 856         __skb_queue_purge(&csk->receive_queue);
 857
 858         if (csk->state == CTP_ACTIVE_OPEN)
 859                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 860         else if (csk->state == CTP_ESTABLISHED) {
 861                 close_req = 1;
 862                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 863         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 864                 close_req = 1;
 865                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 866         }
 867
 868         if (close_req) {
 869                 if (data_lost)
 870                         csk->cdev->csk_send_abort_req(csk);
 871                 else
 872                         csk->cdev->csk_send_close_req(csk);
 873         }
 874
 875         spin_unlock_bh(&csk->lock);
 876 }
 877
 878 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 879 {
 880         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 881                         csk, csk->state, csk->flags,
 882                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 883                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 884                         errno);
 885
 886         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 887         csk->err = errno;
 888         cxgbi_sock_closed(csk);
 889 }
 890 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 891
 892 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 893 {
 894         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 895
 896         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 897                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 898         cxgbi_sock_get(csk);
 899         spin_lock_bh(&csk->lock);
 900         if (csk->state == CTP_ACTIVE_OPEN)
 901                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 902         spin_unlock_bh(&csk->lock);
 903         cxgbi_sock_put(csk);
 904         __kfree_skb(skb);
 905 }
 906 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 907
 908 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 909 {
 910         cxgbi_sock_get(csk);
 911         spin_lock_bh(&csk->lock);
 912
 913         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 914         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 915                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 916                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 917                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 918                                csk, csk->state, csk->flags, csk->tid);
 919                 cxgbi_sock_closed(csk);
 920         }
 921
 922         spin_unlock_bh(&csk->lock);
 923         cxgbi_sock_put(csk);
 924 }
 925 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 926
 927 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 928 {
 929         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 930                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 931         cxgbi_sock_get(csk);
 932         spin_lock_bh(&csk->lock);
 933
 934         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 935                 goto done;
 936
 937         switch (csk->state) {
 938         case CTP_ESTABLISHED:
 939                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 940                 break;
 941         case CTP_ACTIVE_CLOSE:
 942                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 943                 break;
 944         case CTP_CLOSE_WAIT_1:
 945                 cxgbi_sock_closed(csk);
 946                 break;
 947         case CTP_ABORTING:
 948                 break;
 949         default:
 950                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 951                         csk, csk->state, csk->flags, csk->tid);
 952         }
 953         cxgbi_inform_iscsi_conn_closing(csk);
 954 done:
 955         spin_unlock_bh(&csk->lock);
 956         cxgbi_sock_put(csk);
 957 }
 958 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 959
 960 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 961 {
 962         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 963                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 964         cxgbi_sock_get(csk);
 965         spin_lock_bh(&csk->lock);
 966
 967         csk->snd_una = snd_nxt - 1;
 968         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 969                 goto done;
 970
 971         switch (csk->state) {
 972         case CTP_ACTIVE_CLOSE:
 973                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
 974                 break;
 975         case CTP_CLOSE_WAIT_1:
 976         case CTP_CLOSE_WAIT_2:
 977                 cxgbi_sock_closed(csk);
 978                 break;
 979         case CTP_ABORTING:
 980                 break;
 981         default:
 982                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 983                         csk, csk->state, csk->flags, csk->tid);
 984         }
 985 done:
 986         spin_unlock_bh(&csk->lock);
 987         cxgbi_sock_put(csk);
 988 }
 989 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
 990
 991 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
 992                            unsigned int snd_una, int seq_chk)
 993 {
 994         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
 995                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
 996                         csk, csk->state, csk->flags, csk->tid, credits,
 997                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
 998
 999         spin_lock_bh(&csk->lock);
1000
1001         csk->wr_cred += credits;
1002         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1003                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1004
1005         while (credits) {
1006                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1007
1008                 if (unlikely(!p)) {
1009                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1010                                 csk, csk->state, csk->flags, csk->tid, credits,
1011                                 csk->wr_cred, csk->wr_una_cred);
1012                         break;
1013                 }
1014
1015                 if (unlikely(credits < p->csum)) {
1016                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1017                                 csk, csk->state, csk->flags, csk->tid,
1018                                 credits, csk->wr_cred, csk->wr_una_cred,
1019                                 p->csum);
1020                         p->csum -= credits;
1021                         break;
1022                 } else {
1023                         cxgbi_sock_dequeue_wr(csk);
1024                         credits -= p->csum;
1025                         kfree_skb(p);
1026                 }
1027         }
1028
1029         cxgbi_sock_check_wr_invariants(csk);
1030
1031         if (seq_chk) {
1032                 if (unlikely(before(snd_una, csk->snd_una))) {
1033                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1034                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1035                                 csk->snd_una);
1036                         goto done;
1037                 }
1038
1039                 if (csk->snd_una != snd_una) {
1040                         csk->snd_una = snd_una;
1041                         dst_confirm(csk->dst);
1042                 }
1043         }
1044
1045         if (skb_queue_len(&csk->write_queue)) {
1046                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1047                         cxgbi_conn_tx_open(csk);
1048         } else
1049                 cxgbi_conn_tx_open(csk);
1050 done:
1051         spin_unlock_bh(&csk->lock);
1052 }
1053 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1054
1055 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1056                                              unsigned short mtu)
1057 {
1058         int i = 0;
1059
1060         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1061                 ++i;
1062
1063         return i;
1064 }
1065
1066 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1067 {
1068         unsigned int idx;
1069         struct dst_entry *dst = csk->dst;
1070
1071         csk->advmss = dst_metric_advmss(dst);
1072
1073         if (csk->advmss > pmtu - 40)
1074                 csk->advmss = pmtu - 40;
1075         if (csk->advmss < csk->cdev->mtus[0] - 40)
1076                 csk->advmss = csk->cdev->mtus[0] - 40;
1077         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1078
1079         return idx;
1080 }
1081 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1082
1083 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1084 {
1085         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1086         __skb_queue_tail(&csk->write_queue, skb);
1087 }
1088 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1089
1090 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1091 {
1092         struct sk_buff *skb;
1093
1094         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1095                 kfree_skb(skb);
1096 }
1097 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1098
1099 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1100 {
1101         int pending = cxgbi_sock_count_pending_wrs(csk);
1102
1103         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1104                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1105                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1106 }
1107 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1108
1109 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1110 {
1111         struct cxgbi_device *cdev = csk->cdev;
1112         struct sk_buff *next;
1113         int err, copied = 0;
1114
1115         spin_lock_bh(&csk->lock);
1116
1117         if (csk->state != CTP_ESTABLISHED) {
1118                 log_debug(1 << CXGBI_DBG_PDU_TX,
1119                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1120                         csk, csk->state, csk->flags, csk->tid);
1121                 err = -EAGAIN;
1122                 goto out_err;
1123         }
1124
1125         if (csk->err) {
1126                 log_debug(1 << CXGBI_DBG_PDU_TX,
1127                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1128                         csk, csk->state, csk->flags, csk->tid, csk->err);
1129                 err = -EPIPE;
1130                 goto out_err;
1131         }
1132
1133         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1134                 log_debug(1 << CXGBI_DBG_PDU_TX,
1135                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1136                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1137                         csk->snd_una, csk->snd_win);
1138                 err = -ENOBUFS;
1139                 goto out_err;
1140         }
1141
1142         while (skb) {
1143                 int frags = skb_shinfo(skb)->nr_frags +
1144                                 (skb->len != skb->data_len);
1145
1146                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1147                         pr_err("csk 0x%p, skb head %u < %u.\n",
1148                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1149                         err = -EINVAL;
1150                         goto out_err;
1151                 }
1152
1153                 if (frags >= SKB_WR_LIST_SIZE) {
1154                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1155                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1156                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1157                         err = -EINVAL;
1158                         goto out_err;
1159                 }
1160
1161                 next = skb->next;
1162                 skb->next = NULL;
1163                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1164                 cxgbi_sock_skb_entail(csk, skb);
1165                 copied += skb->len;
1166                 csk->write_seq += skb->len +
1167                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1168                 skb = next;
1169         }
1170 done:
1171         if (likely(skb_queue_len(&csk->write_queue)))
1172                 cdev->csk_push_tx_frames(csk, 1);
1173         spin_unlock_bh(&csk->lock);
1174         return copied;
1175
1176 out_err:
1177         if (copied == 0 && err == -EPIPE)
1178                 copied = csk->err ? csk->err : -EPIPE;
1179         else
1180                 copied = err;
1181         goto done;
1182 }
1183
1184 /*
1185  * Direct Data Placement -
1186  * Directly place the iSCSI Data-In or Data-Out PDU's payload into pre-posted
1187  * final destination host-memory buffers based on the Initiator Task Tag (ITT)
1188  * in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
1189  * The host memory address is programmed into h/w in the format of pagepod
1190  * entries.
1191  * The location of the pagepod entry is encoded into ddp tag which is used as
1192  * the base for ITT/TTT.
1193  */
1194
1195 static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
1196 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
1197 static unsigned char page_idx = DDP_PGIDX_MAX;
1198
1199 static unsigned char sw_tag_idx_bits;
1200 static unsigned char sw_tag_age_bits;
1201
1202 /*
1203  * Direct-Data Placement page size adjustment
1204  */
1205 static int ddp_adjust_page_table(void)
1206 {
1207         int i;
1208         unsigned int base_order, order;
1209
1210         if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
1211                 pr_info("PAGE_SIZE 0x%lx too small, min 0x%lx\n",
1212                         PAGE_SIZE, 1UL << ddp_page_shift[0]);
1213                 return -EINVAL;
1214         }
1215
1216         base_order = get_order(1UL << ddp_page_shift[0]);
1217         order = get_order(1UL << PAGE_SHIFT);
1218
1219         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1220                 /* first is the kernel page size, then just doubling */
1221                 ddp_page_order[i] = order - base_order + i;
1222                 ddp_page_shift[i] = PAGE_SHIFT + i;
1223         }
1224         return 0;
1225 }
1226
1227 static int ddp_find_page_index(unsigned long pgsz)
1228 {
1229         int i;
1230
1231         for (i = 0; i < DDP_PGIDX_MAX; i++) {
1232                 if (pgsz == (1UL << ddp_page_shift[i]))
1233                         return i;
1234         }
1235         pr_info("ddp page size %lu not supported.\n", pgsz);
1236         return DDP_PGIDX_MAX;
1237 }
1238
1239 static void ddp_setup_host_page_size(void)
1240 {
1241         if (page_idx == DDP_PGIDX_MAX) {
1242                 page_idx = ddp_find_page_index(PAGE_SIZE);
1243
1244                 if (page_idx == DDP_PGIDX_MAX) {
1245                         pr_info("system PAGE %lu, update hw.\n", PAGE_SIZE);
1246                         if (ddp_adjust_page_table() < 0) {
1247                                 pr_info("PAGE %lu, disable ddp.\n", PAGE_SIZE);
1248                                 return;
1249                         }
1250                         page_idx = ddp_find_page_index(PAGE_SIZE);
1251                 }
1252                 pr_info("system PAGE %lu, ddp idx %u.\n", PAGE_SIZE, page_idx);
1253         }
1254 }
1255
1256 void cxgbi_ddp_page_size_factor(int *pgsz_factor)
1257 {
1258         int i;
1259
1260         for (i = 0; i < DDP_PGIDX_MAX; i++)
1261                 pgsz_factor[i] = ddp_page_order[i];
1262 }
1263 EXPORT_SYMBOL_GPL(cxgbi_ddp_page_size_factor);
1264
1265 /*
1266  * DDP setup & teardown
1267  */
1268
1269 void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *ppod,
1270                         struct cxgbi_pagepod_hdr *hdr,
1271                         struct cxgbi_gather_list *gl, unsigned int gidx)
1272 {
1273         int i;
1274
1275         memcpy(ppod, hdr, sizeof(*hdr));
1276         for (i = 0; i < (PPOD_PAGES_MAX + 1); i++, gidx++) {
1277                 ppod->addr[i] = gidx < gl->nelem ?
1278                                 cpu_to_be64(gl->phys_addr[gidx]) : 0ULL;
1279         }
1280 }
1281 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_set);
1282
1283 void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *ppod)
1284 {
1285         memset(ppod, 0, sizeof(*ppod));
1286 }
1287 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppod_clear);
1288
1289 static inline int ddp_find_unused_entries(struct cxgbi_ddp_info *ddp,
1290                                         unsigned int start, unsigned int max,
1291                                         unsigned int count,
1292                                         struct cxgbi_gather_list *gl)
1293 {
1294         unsigned int i, j, k;
1295
1296         /*  not enough entries */
1297         if ((max - start) < count) {
1298                 log_debug(1 << CXGBI_DBG_DDP,
1299                         "NOT enough entries %u+%u < %u.\n", start, count, max);
1300                 return -EBUSY;
1301         }
1302
1303         max -= count;
1304         spin_lock(&ddp->map_lock);
1305         for (i = start; i < max;) {
1306                 for (j = 0, k = i; j < count; j++, k++) {
1307                         if (ddp->gl_map[k])
1308                                 break;
1309                 }
1310                 if (j == count) {
1311                         for (j = 0, k = i; j < count; j++, k++)
1312                                 ddp->gl_map[k] = gl;
1313                         spin_unlock(&ddp->map_lock);
1314                         return i;
1315                 }
1316                 i += j + 1;
1317         }
1318         spin_unlock(&ddp->map_lock);
1319         log_debug(1 << CXGBI_DBG_DDP,
1320                 "NO suitable entries %u available.\n", count);
1321         return -EBUSY;
1322 }
1323
1324 static inline void ddp_unmark_entries(struct cxgbi_ddp_info *ddp,
1325                                                 int start, int count)
1326 {
1327         spin_lock(&ddp->map_lock);
1328         memset(&ddp->gl_map[start], 0,
1329                 count * sizeof(struct cxgbi_gather_list *));
1330         spin_unlock(&ddp->map_lock);
1331 }
1332
1333 static inline void ddp_gl_unmap(struct pci_dev *pdev,
1334                                         struct cxgbi_gather_list *gl)
1335 {
1336         int i;
1337
1338         for (i = 0; i < gl->nelem; i++)
1339                 dma_unmap_page(&pdev->dev, gl->phys_addr[i], PAGE_SIZE,
1340                                 PCI_DMA_FROMDEVICE);
1341 }
1342
1343 static inline int ddp_gl_map(struct pci_dev *pdev,
1344                                     struct cxgbi_gather_list *gl)
1345 {
1346         int i;
1347
1348         for (i = 0; i < gl->nelem; i++) {
1349                 gl->phys_addr[i] = dma_map_page(&pdev->dev, gl->pages[i], 0,
1350                                                 PAGE_SIZE,
1351                                                 PCI_DMA_FROMDEVICE);
1352                 if (unlikely(dma_mapping_error(&pdev->dev, gl->phys_addr[i]))) {
1353                         log_debug(1 << CXGBI_DBG_DDP,
1354                                 "page %d 0x%p, 0x%p dma mapping err.\n",
1355                                 i, gl->pages[i], pdev);
1356                         goto unmap;
1357                 }
1358         }
1359         return i;
1360 unmap:
1361         if (i) {
1362                 unsigned int nelem = gl->nelem;
1363
1364                 gl->nelem = i;
1365                 ddp_gl_unmap(pdev, gl);
1366                 gl->nelem = nelem;
1367         }
1368         return -EINVAL;
1369 }
1370
1371 static void ddp_release_gl(struct cxgbi_gather_list *gl,
1372                                   struct pci_dev *pdev)
1373 {
1374         ddp_gl_unmap(pdev, gl);
1375         kfree(gl);
1376 }
1377
1378 static struct cxgbi_gather_list *ddp_make_gl(unsigned int xferlen,
1379                                                     struct scatterlist *sgl,
1380                                                     unsigned int sgcnt,
1381                                                     struct pci_dev *pdev,
1382                                                     gfp_t gfp)
1383 {
1384         struct cxgbi_gather_list *gl;
1385         struct scatterlist *sg = sgl;
1386         struct page *sgpage = sg_page(sg);
1387         unsigned int sglen = sg->length;
1388         unsigned int sgoffset = sg->offset;
1389         unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
1390                                 PAGE_SHIFT;
1391         int i = 1, j = 0;
1392
1393         if (xferlen < DDP_THRESHOLD) {
1394                 log_debug(1 << CXGBI_DBG_DDP,
1395                         "xfer %u < threshold %u, no ddp.\n",
1396                         xferlen, DDP_THRESHOLD);
1397                 return NULL;
1398         }
1399
1400         gl = kzalloc(sizeof(struct cxgbi_gather_list) +
1401                      npages * (sizeof(dma_addr_t) +
1402                      sizeof(struct page *)), gfp);
1403         if (!gl) {
1404                 log_debug(1 << CXGBI_DBG_DDP,
1405                         "xfer %u, %u pages, OOM.\n", xferlen, npages);
1406                 return NULL;
1407         }
1408
1409          log_debug(1 << CXGBI_DBG_DDP,
1410                 "xfer %u, sgl %u, gl max %u.\n", xferlen, sgcnt, npages);
1411
1412         gl->pages = (struct page **)&gl->phys_addr[npages];
1413         gl->nelem = npages;
1414         gl->length = xferlen;
1415         gl->offset = sgoffset;
1416         gl->pages[0] = sgpage;
1417
1418         for (i = 1, sg = sg_next(sgl), j = 0; i < sgcnt;
1419                 i++, sg = sg_next(sg)) {
1420                 struct page *page = sg_page(sg);
1421
1422                 if (sgpage == page && sg->offset == sgoffset + sglen)
1423                         sglen += sg->length;
1424                 else {
1425                         /*  make sure the sgl is fit for ddp:
1426                          *  each has the same page size, and
1427                          *  all of the middle pages are used completely
1428                          */
1429                         if ((j && sgoffset) || ((i != sgcnt - 1) &&
1430                             ((sglen + sgoffset) & ~PAGE_MASK))) {
1431                                 log_debug(1 << CXGBI_DBG_DDP,
1432                                         "page %d/%u, %u + %u.\n",
1433                                         i, sgcnt, sgoffset, sglen);
1434                                 goto error_out;
1435                         }
1436
1437                         j++;
1438                         if (j == gl->nelem || sg->offset) {
1439                                 log_debug(1 << CXGBI_DBG_DDP,
1440                                         "page %d/%u, offset %u.\n",
1441                                         j, gl->nelem, sg->offset);
1442                                 goto error_out;
1443                         }
1444                         gl->pages[j] = page;
1445                         sglen = sg->length;
1446                         sgoffset = sg->offset;
1447                         sgpage = page;
1448                 }
1449         }
1450         gl->nelem = ++j;
1451
1452         if (ddp_gl_map(pdev, gl) < 0)
1453                 goto error_out;
1454
1455         return gl;
1456
1457 error_out:
1458         kfree(gl);
1459         return NULL;
1460 }
1461
1462 static void ddp_tag_release(struct cxgbi_hba *chba, u32 tag)
1463 {
1464         struct cxgbi_device *cdev = chba->cdev;
1465         struct cxgbi_ddp_info *ddp = cdev->ddp;
1466         u32 idx;
1467
1468         idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
1469         if (idx < ddp->nppods) {
1470                 struct cxgbi_gather_list *gl = ddp->gl_map[idx];
1471                 unsigned int npods;
1472
1473                 if (!gl || !gl->nelem) {
1474                         pr_warn("tag 0x%x, idx %u, gl 0x%p, %u.\n",
1475                                 tag, idx, gl, gl ? gl->nelem : 0);
1476                         return;
1477                 }
1478                 npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1479                 log_debug(1 << CXGBI_DBG_DDP,
1480                         "tag 0x%x, release idx %u, npods %u.\n",
1481                         tag, idx, npods);
1482                 cdev->csk_ddp_clear(chba, tag, idx, npods);
1483                 ddp_unmark_entries(ddp, idx, npods);
1484                 ddp_release_gl(gl, ddp->pdev);
1485         } else
1486                 pr_warn("tag 0x%x, idx %u > max %u.\n", tag, idx, ddp->nppods);
1487 }
1488
1489 static int ddp_tag_reserve(struct cxgbi_sock *csk, unsigned int tid,
1490                            u32 sw_tag, u32 *tagp, struct cxgbi_gather_list *gl,
1491                            gfp_t gfp)
1492 {
1493         struct cxgbi_device *cdev = csk->cdev;
1494         struct cxgbi_ddp_info *ddp = cdev->ddp;
1495         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1496         struct cxgbi_pagepod_hdr hdr;
1497         unsigned int npods;
1498         int idx = -1;
1499         int err = -ENOMEM;
1500         u32 tag;
1501
1502         npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
1503         if (ddp->idx_last == ddp->nppods)
1504                 idx = ddp_find_unused_entries(ddp, 0, ddp->nppods,
1505                                                         npods, gl);
1506         else {
1507                 idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
1508                                                         ddp->nppods, npods,
1509                                                         gl);
1510                 if (idx < 0 && ddp->idx_last >= npods) {
1511                         idx = ddp_find_unused_entries(ddp, 0,
1512                                 min(ddp->idx_last + npods, ddp->nppods),
1513                                                         npods, gl);
1514                 }
1515         }
1516         if (idx < 0) {
1517                 log_debug(1 << CXGBI_DBG_DDP,
1518                         "xferlen %u, gl %u, npods %u NO DDP.\n",
1519                         gl->length, gl->nelem, npods);
1520                 return idx;
1521         }
1522
1523         tag = cxgbi_ddp_tag_base(tformat, sw_tag);
1524         tag |= idx << PPOD_IDX_SHIFT;
1525
1526         hdr.rsvd = 0;
1527         hdr.vld_tid = htonl(PPOD_VALID_FLAG | PPOD_TID(tid));
1528         hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
1529         hdr.max_offset = htonl(gl->length);
1530         hdr.page_offset = htonl(gl->offset);
1531
1532         err = cdev->csk_ddp_set(csk, &hdr, idx, npods, gl);
1533         if (err < 0)
1534                 goto unmark_entries;
1535
1536         ddp->idx_last = idx;
1537         log_debug(1 << CXGBI_DBG_DDP,
1538                 "xfer %u, gl %u,%u, tid 0x%x, tag 0x%x->0x%x(%u,%u).\n",
1539                 gl->length, gl->nelem, gl->offset, tid, sw_tag, tag, idx,
1540                 npods);
1541         *tagp = tag;
1542         return 0;
1543
1544 unmark_entries:
1545         ddp_unmark_entries(ddp, idx, npods);
1546         return err;
1547 }
1548
1549 int cxgbi_ddp_reserve(struct cxgbi_sock *csk, unsigned int *tagp,
1550                         unsigned int sw_tag, unsigned int xferlen,
1551                         struct scatterlist *sgl, unsigned int sgcnt, gfp_t gfp)
1552 {
1553         struct cxgbi_device *cdev = csk->cdev;
1554         struct cxgbi_tag_format *tformat = &cdev->tag_format;
1555         struct cxgbi_gather_list *gl;
1556         int err;
1557
1558         if (page_idx >= DDP_PGIDX_MAX || !cdev->ddp ||
1559             xferlen < DDP_THRESHOLD) {
1560                 log_debug(1 << CXGBI_DBG_DDP,
1561                         "pgidx %u, xfer %u, NO ddp.\n", page_idx, xferlen);
1562                 return -EINVAL;
1563         }
1564
1565         if (!cxgbi_sw_tag_usable(tformat, sw_tag)) {
1566                 log_debug(1 << CXGBI_DBG_DDP,
1567                         "sw_tag 0x%x NOT usable.\n", sw_tag);
1568                 return -EINVAL;
1569         }
1570
1571         gl = ddp_make_gl(xferlen, sgl, sgcnt, cdev->pdev, gfp);
1572         if (!gl)
1573                 return -ENOMEM;
1574
1575         err = ddp_tag_reserve(csk, csk->tid, sw_tag, tagp, gl, gfp);
1576         if (err < 0)
1577                 ddp_release_gl(gl, cdev->pdev);
1578
1579         return err;
1580 }
1581
1582 static void ddp_destroy(struct kref *kref)
1583 {
1584         struct cxgbi_ddp_info *ddp = container_of(kref,
1585                                                 struct cxgbi_ddp_info,
1586                                                 refcnt);
1587         struct cxgbi_device *cdev = ddp->cdev;
1588         int i = 0;
1589
1590         pr_info("kref 0, destroy ddp 0x%p, cdev 0x%p.\n", ddp, cdev);
1591
1592         while (i < ddp->nppods) {
1593                 struct cxgbi_gather_list *gl = ddp->gl_map[i];
1594
1595                 if (gl) {
1596                         int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
1597                                         >> PPOD_PAGES_SHIFT;
1598                         pr_info("cdev 0x%p, ddp %d + %d.\n", cdev, i, npods);
1599                         kfree(gl);
1600                         i += npods;
1601                 } else
1602                         i++;
1603         }
1604         cxgbi_free_big_mem(ddp);
1605 }
1606
1607 int cxgbi_ddp_cleanup(struct cxgbi_device *cdev)
1608 {
1609         struct cxgbi_ddp_info *ddp = cdev->ddp;
1610
1611         log_debug(1 << CXGBI_DBG_DDP,
1612                 "cdev 0x%p, release ddp 0x%p.\n", cdev, ddp);
1613         cdev->ddp = NULL;
1614         if (ddp)
1615                 return kref_put(&ddp->refcnt, ddp_destroy);
1616         return 0;
1617 }
1618 EXPORT_SYMBOL_GPL(cxgbi_ddp_cleanup);
1619
1620 int cxgbi_ddp_init(struct cxgbi_device *cdev,
1621                    unsigned int llimit, unsigned int ulimit,
1622                    unsigned int max_txsz, unsigned int max_rxsz)
1623 {
1624         struct cxgbi_ddp_info *ddp;
1625         unsigned int ppmax, bits;
1626
1627         ppmax = (ulimit - llimit + 1) >> PPOD_SIZE_SHIFT;
1628         bits = __ilog2_u32(ppmax) + 1;
1629         if (bits > PPOD_IDX_MAX_SIZE)
1630                 bits = PPOD_IDX_MAX_SIZE;
1631         ppmax = (1 << (bits - 1)) - 1;
1632
1633         ddp = cxgbi_alloc_big_mem(sizeof(struct cxgbi_ddp_info) +
1634                                 ppmax * (sizeof(struct cxgbi_gather_list *) +
1635                                          sizeof(struct sk_buff *)),
1636                                 GFP_KERNEL);
1637         if (!ddp) {
1638                 pr_warn("cdev 0x%p, ddp ppmax %u OOM.\n", cdev, ppmax);
1639                 return -ENOMEM;
1640         }
1641         ddp->gl_map = (struct cxgbi_gather_list **)(ddp + 1);
1642         cdev->ddp = ddp;
1643
1644         spin_lock_init(&ddp->map_lock);
1645         kref_init(&ddp->refcnt);
1646
1647         ddp->cdev = cdev;
1648         ddp->pdev = cdev->pdev;
1649         ddp->llimit = llimit;
1650         ddp->ulimit = ulimit;
1651         ddp->max_txsz = min_t(unsigned int, max_txsz, ULP2_MAX_PKT_SIZE);
1652         ddp->max_rxsz = min_t(unsigned int, max_rxsz, ULP2_MAX_PKT_SIZE);
1653         ddp->nppods = ppmax;
1654         ddp->idx_last = ppmax;
1655         ddp->idx_bits = bits;
1656         ddp->idx_mask = (1 << bits) - 1;
1657         ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
1658
1659         cdev->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
1660         cdev->tag_format.rsvd_bits = ddp->idx_bits;
1661         cdev->tag_format.rsvd_shift = PPOD_IDX_SHIFT;
1662         cdev->tag_format.rsvd_mask = (1 << cdev->tag_format.rsvd_bits) - 1;
1663
1664         pr_info("%s tag format, sw %u, rsvd %u,%u, mask 0x%x.\n",
1665                 cdev->ports[0]->name, cdev->tag_format.sw_bits,
1666                 cdev->tag_format.rsvd_bits, cdev->tag_format.rsvd_shift,
1667                 cdev->tag_format.rsvd_mask);
1668
1669         cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1670                                 ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
1671         cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
1672                                 ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
1673
1674         log_debug(1 << CXGBI_DBG_DDP,
1675                 "%s max payload size: %u/%u, %u/%u.\n",
1676                 cdev->ports[0]->name, cdev->tx_max_size, ddp->max_txsz,
1677                 cdev->rx_max_size, ddp->max_rxsz);
1678         return 0;
1679 }
1680 EXPORT_SYMBOL_GPL(cxgbi_ddp_init);
1681
1682 /*
1683  * APIs interacting with open-iscsi libraries
1684  */
1685
1686 static unsigned char padding[4];
1687
1688 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1689 {
1690         struct scsi_cmnd *sc = task->sc;
1691         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1692         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1693         struct cxgbi_hba *chba = cconn->chba;
1694         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1695         u32 tag = ntohl((__force u32)hdr_itt);
1696
1697         log_debug(1 << CXGBI_DBG_DDP,
1698                    "cdev 0x%p, release tag 0x%x.\n", chba->cdev, tag);
1699         if (sc &&
1700             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
1701             cxgbi_is_ddp_tag(tformat, tag))
1702                 ddp_tag_release(chba, tag);
1703 }
1704
1705 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1706 {
1707         struct scsi_cmnd *sc = task->sc;
1708         struct iscsi_conn *conn = task->conn;
1709         struct iscsi_session *sess = conn->session;
1710         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1711         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1712         struct cxgbi_hba *chba = cconn->chba;
1713         struct cxgbi_tag_format *tformat = &chba->cdev->tag_format;
1714         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
1715         u32 tag = 0;
1716         int err = -EINVAL;
1717
1718         if (sc &&
1719             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE)) {
1720                 err = cxgbi_ddp_reserve(cconn->cep->csk, &tag, sw_tag,
1721                                         scsi_in(sc)->length,
1722                                         scsi_in(sc)->table.sgl,
1723                                         scsi_in(sc)->table.nents,
1724                                         GFP_ATOMIC);
1725                 if (err < 0)
1726                         log_debug(1 << CXGBI_DBG_DDP,
1727                                 "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1728                                 cconn->cep->csk, task, scsi_in(sc)->length,
1729                                 scsi_in(sc)->table.nents);
1730         }
1731
1732         if (err < 0)
1733                 tag = cxgbi_set_non_ddp_tag(tformat, sw_tag);
1734         /*  the itt need to sent in big-endian order */
1735         *hdr_itt = (__force itt_t)htonl(tag);
1736
1737         log_debug(1 << CXGBI_DBG_DDP,
1738                 "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1739                 chba->cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1740         return 0;
1741 }
1742
1743 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1744 {
1745         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1746         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1747         struct cxgbi_device *cdev = cconn->chba->cdev;
1748         u32 tag = ntohl((__force u32) itt);
1749         u32 sw_bits;
1750
1751         sw_bits = cxgbi_tag_nonrsvd_bits(&cdev->tag_format, tag);
1752         if (idx)
1753                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
1754         if (age)
1755                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
1756
1757         log_debug(1 << CXGBI_DBG_DDP,
1758                 "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1759                 cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1760                 age ? *age : 0xFF);
1761 }
1762 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1763
1764 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1765 {
1766         struct iscsi_conn *conn = csk->user_data;
1767
1768         if (conn) {
1769                 log_debug(1 << CXGBI_DBG_SOCK,
1770                         "csk 0x%p, cid %d.\n", csk, conn->id);
1771                 iscsi_conn_queue_work(conn);
1772         }
1773 }
1774 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1775
1776 /*
1777  * pdu receive, interact with libiscsi_tcp
1778  */
1779 static inline int read_pdu_skb(struct iscsi_conn *conn,
1780                                struct sk_buff *skb,
1781                                unsigned int offset,
1782                                int offloaded)
1783 {
1784         int status = 0;
1785         int bytes_read;
1786
1787         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1788         switch (status) {
1789         case ISCSI_TCP_CONN_ERR:
1790                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1791                           skb, offset, offloaded);
1792                 return -EIO;
1793         case ISCSI_TCP_SUSPENDED:
1794                 log_debug(1 << CXGBI_DBG_PDU_RX,
1795                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1796                         skb, offset, offloaded, bytes_read);
1797                 /* no transfer - just have caller flush queue */
1798                 return bytes_read;
1799         case ISCSI_TCP_SKB_DONE:
1800                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1801                         skb, offset, offloaded);
1802                 /*
1803                  * pdus should always fit in the skb and we should get
1804                  * segment done notifcation.
1805                  */
1806                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1807                 return -EFAULT;
1808         case ISCSI_TCP_SEGMENT_DONE:
1809                 log_debug(1 << CXGBI_DBG_PDU_RX,
1810                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1811                         skb, offset, offloaded, bytes_read);
1812                 return bytes_read;
1813         default:
1814                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1815                         skb, offset, offloaded, status);
1816                 return -EINVAL;
1817         }
1818 }
1819
1820 static int skb_read_pdu_bhs(struct iscsi_conn *conn, struct sk_buff *skb)
1821 {
1822         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1823
1824         log_debug(1 << CXGBI_DBG_PDU_RX,
1825                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1826                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1827
1828         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1829                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1830                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1831                 return -EIO;
1832         }
1833
1834         if (conn->hdrdgst_en &&
1835             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1836                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1837                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1838                 return -EIO;
1839         }
1840
1841         return read_pdu_skb(conn, skb, 0, 0);
1842 }
1843
1844 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1845                              struct sk_buff *skb, unsigned int offset)
1846 {
1847         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1848         bool offloaded = 0;
1849         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1850
1851         log_debug(1 << CXGBI_DBG_PDU_RX,
1852                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1853                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1854
1855         if (conn->datadgst_en &&
1856             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1857                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1858                         conn, lskb, cxgbi_skcb_flags(lskb));
1859                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1860                 return -EIO;
1861         }
1862
1863         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1864                 return 0;
1865
1866         /* coalesced, add header digest length */
1867         if (lskb == skb && conn->hdrdgst_en)
1868                 offset += ISCSI_DIGEST_SIZE;
1869
1870         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1871                 offloaded = 1;
1872
1873         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1874                 log_debug(1 << CXGBI_DBG_PDU_RX,
1875                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1876                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1877                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1878
1879         return read_pdu_skb(conn, skb, offset, offloaded);
1880 }
1881
1882 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1883 {
1884         struct cxgbi_device *cdev = csk->cdev;
1885         int must_send;
1886         u32 credits;
1887
1888         log_debug(1 << CXGBI_DBG_PDU_RX,
1889                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1890                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1891                 csk->rcv_wup, cdev->rx_credit_thres,
1892                 csk->rcv_win);
1893
1894         if (csk->state != CTP_ESTABLISHED)
1895                 return;
1896
1897         credits = csk->copied_seq - csk->rcv_wup;
1898         if (unlikely(!credits))
1899                 return;
1900         if (unlikely(cdev->rx_credit_thres == 0))
1901                 return;
1902
1903         must_send = credits + 16384 >= csk->rcv_win;
1904         if (must_send || credits >= cdev->rx_credit_thres)
1905                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1906 }
1907
1908 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1909 {
1910         struct cxgbi_device *cdev = csk->cdev;
1911         struct iscsi_conn *conn = csk->user_data;
1912         struct sk_buff *skb;
1913         unsigned int read = 0;
1914         int err = 0;
1915
1916         log_debug(1 << CXGBI_DBG_PDU_RX,
1917                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1918
1919         if (unlikely(!conn || conn->suspend_rx)) {
1920                 log_debug(1 << CXGBI_DBG_PDU_RX,
1921                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1922                         csk, conn, conn ? conn->id : 0xFF,
1923                         conn ? conn->suspend_rx : 0xFF);
1924                 return;
1925         }
1926
1927         while (!err) {
1928                 skb = skb_peek(&csk->receive_queue);
1929                 if (!skb ||
1930                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1931                         if (skb)
1932                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1933                                         "skb 0x%p, NOT ready 0x%lx.\n",
1934                                         skb, cxgbi_skcb_flags(skb));
1935                         break;
1936                 }
1937                 __skb_unlink(skb, &csk->receive_queue);
1938
1939                 read += cxgbi_skcb_rx_pdulen(skb);
1940                 log_debug(1 << CXGBI_DBG_PDU_RX,
1941                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1942                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1943                         cxgbi_skcb_rx_pdulen(skb));
1944
1945                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1946                         err = skb_read_pdu_bhs(conn, skb);
1947                         if (err < 0) {
1948                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1949                                         "f 0x%lx, plen %u.\n",
1950                                         csk, skb, skb->len,
1951                                         cxgbi_skcb_flags(skb),
1952                                         cxgbi_skcb_rx_pdulen(skb));
1953                                 goto skb_done;
1954                         }
1955                         err = skb_read_pdu_data(conn, skb, skb,
1956                                                 err + cdev->skb_rx_extra);
1957                         if (err < 0)
1958                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1959                                         "f 0x%lx, plen %u.\n",
1960                                         csk, skb, skb->len,
1961                                         cxgbi_skcb_flags(skb),
1962                                         cxgbi_skcb_rx_pdulen(skb));
1963                 } else {
1964                         err = skb_read_pdu_bhs(conn, skb);
1965                         if (err < 0) {
1966                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1967                                         "f 0x%lx, plen %u.\n",
1968                                         csk, skb, skb->len,
1969                                         cxgbi_skcb_flags(skb),
1970                                         cxgbi_skcb_rx_pdulen(skb));
1971                                 goto skb_done;
1972                         }
1973
1974                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1975                                 struct sk_buff *dskb;
1976
1977                                 dskb = skb_peek(&csk->receive_queue);
1978                                 if (!dskb) {
1979                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1980                                                 " plen %u, NO data.\n",
1981                                                 csk, skb, skb->len,
1982                                                 cxgbi_skcb_flags(skb),
1983                                                 cxgbi_skcb_rx_pdulen(skb));
1984                                         err = -EIO;
1985                                         goto skb_done;
1986                                 }
1987                                 __skb_unlink(dskb, &csk->receive_queue);
1988
1989                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1990                                 if (err < 0)
1991                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1992                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1993                                                 "%u.\n",
1994                                                 csk, skb, skb->len,
1995                                                 cxgbi_skcb_flags(skb),
1996                                                 cxgbi_skcb_rx_pdulen(skb),
1997                                                 dskb, dskb->len);
1998                                 __kfree_skb(dskb);
1999                         } else
2000                                 err = skb_read_pdu_data(conn, skb, skb, 0);
2001                 }
2002 skb_done:
2003                 __kfree_skb(skb);
2004
2005                 if (err < 0)
2006                         break;
2007         }
2008
2009         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
2010         if (read) {
2011                 csk->copied_seq += read;
2012                 csk_return_rx_credits(csk, read);
2013                 conn->rxdata_octets += read;
2014         }
2015
2016         if (err < 0) {
2017                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
2018                         csk, conn, err, read);
2019                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2020         }
2021 }
2022 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
2023
2024 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
2025                                 unsigned int offset, unsigned int *off,
2026                                 struct scatterlist **sgp)
2027 {
2028         int i;
2029         struct scatterlist *sg;
2030
2031         for_each_sg(sgl, sg, sgcnt, i) {
2032                 if (offset < sg->length) {
2033                         *off = offset;
2034                         *sgp = sg;
2035                         return 0;
2036                 }
2037                 offset -= sg->length;
2038         }
2039         return -EFAULT;
2040 }
2041
2042 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
2043                                 unsigned int dlen, struct page_frag *frags,
2044                                 int frag_max)
2045 {
2046         unsigned int datalen = dlen;
2047         unsigned int sglen = sg->length - sgoffset;
2048         struct page *page = sg_page(sg);
2049         int i;
2050
2051         i = 0;
2052         do {
2053                 unsigned int copy;
2054
2055                 if (!sglen) {
2056                         sg = sg_next(sg);
2057                         if (!sg) {
2058                                 pr_warn("sg %d NULL, len %u/%u.\n",
2059                                         i, datalen, dlen);
2060                                 return -EINVAL;
2061                         }
2062                         sgoffset = 0;
2063                         sglen = sg->length;
2064                         page = sg_page(sg);
2065
2066                 }
2067                 copy = min(datalen, sglen);
2068                 if (i && page == frags[i - 1].page &&
2069                     sgoffset + sg->offset ==
2070                         frags[i - 1].offset + frags[i - 1].size) {
2071                         frags[i - 1].size += copy;
2072                 } else {
2073                         if (i >= frag_max) {
2074                                 pr_warn("too many pages %u, dlen %u.\n",
2075                                         frag_max, dlen);
2076                                 return -EINVAL;
2077                         }
2078
2079                         frags[i].page = page;
2080                         frags[i].offset = sg->offset + sgoffset;
2081                         frags[i].size = copy;
2082                         i++;
2083                 }
2084                 datalen -= copy;
2085                 sgoffset += copy;
2086                 sglen -= copy;
2087         } while (datalen);
2088
2089         return i;
2090 }
2091
2092 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
2093 {
2094         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2095         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2096         struct cxgbi_device *cdev = cconn->chba->cdev;
2097         struct iscsi_conn *conn = task->conn;
2098         struct iscsi_tcp_task *tcp_task = task->dd_data;
2099         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2100         struct scsi_cmnd *sc = task->sc;
2101         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
2102
2103         tcp_task->dd_data = tdata;
2104         task->hdr = NULL;
2105
2106         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
2107             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
2108              (opcode == ISCSI_OP_SCSI_CMD &&
2109               (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
2110                 /* data could goes into skb head */
2111                 headroom += min_t(unsigned int,
2112                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
2113                                 conn->max_xmit_dlength);
2114
2115         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
2116         if (!tdata->skb) {
2117                 struct cxgbi_sock *csk = cconn->cep->csk;
2118                 struct net_device *ndev = cdev->ports[csk->port_id];
2119                 ndev->stats.tx_dropped++;
2120                 return -ENOMEM;
2121         }
2122
2123         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
2124         task->hdr = (struct iscsi_hdr *)tdata->skb->data;
2125         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
2126
2127         /* data_out uses scsi_cmd's itt */
2128         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
2129                 task_reserve_itt(task, &task->hdr->itt);
2130
2131         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2132                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
2133                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
2134                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
2135
2136         return 0;
2137 }
2138 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
2139
2140 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
2141 {
2142         if (hcrc || dcrc) {
2143                 u8 submode = 0;
2144
2145                 if (hcrc)
2146                         submode |= 1;
2147                 if (dcrc)
2148                         submode |= 2;
2149                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
2150         } else
2151                 cxgbi_skcb_ulp_mode(skb) = 0;
2152 }
2153
2154 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
2155                               unsigned int count)
2156 {
2157         struct iscsi_conn *conn = task->conn;
2158         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2159         struct sk_buff *skb = tdata->skb;
2160         unsigned int datalen = count;
2161         int i, padlen = iscsi_padding(count);
2162         struct page *pg;
2163
2164         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2165                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
2166                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
2167                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
2168
2169         skb_put(skb, task->hdr_len);
2170         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
2171         if (!count)
2172                 return 0;
2173
2174         if (task->sc) {
2175                 struct scsi_data_buffer *sdb = scsi_out(task->sc);
2176                 struct scatterlist *sg = NULL;
2177                 int err;
2178
2179                 tdata->offset = offset;
2180                 tdata->count = count;
2181                 err = sgl_seek_offset(
2182                                         sdb->table.sgl, sdb->table.nents,
2183                                         tdata->offset, &tdata->sgoffset, &sg);
2184                 if (err < 0) {
2185                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
2186                                 sdb->table.nents, tdata->offset, sdb->length);
2187                         return err;
2188                 }
2189                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
2190                                         tdata->frags, MAX_PDU_FRAGS);
2191                 if (err < 0) {
2192                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
2193                                 sdb->table.nents, tdata->offset, tdata->count);
2194                         return err;
2195                 }
2196                 tdata->nr_frags = err;
2197
2198                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2199                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2200                         char *dst = skb->data + task->hdr_len;
2201                         struct page_frag *frag = tdata->frags;
2202
2203                         /* data fits in the skb's headroom */
2204                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2205                                 char *src = kmap_atomic(frag->page);
2206
2207                                 memcpy(dst, src+frag->offset, frag->size);
2208                                 dst += frag->size;
2209                                 kunmap_atomic(src);
2210                         }
2211                         if (padlen) {
2212                                 memset(dst, 0, padlen);
2213                                 padlen = 0;
2214                         }
2215                         skb_put(skb, count + padlen);
2216                 } else {
2217                         /* data fit into frag_list */
2218                         for (i = 0; i < tdata->nr_frags; i++) {
2219                                 __skb_fill_page_desc(skb, i,
2220                                                 tdata->frags[i].page,
2221                                                 tdata->frags[i].offset,
2222                                                 tdata->frags[i].size);
2223                                 skb_frag_ref(skb, i);
2224                         }
2225                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2226                         skb->len += count;
2227                         skb->data_len += count;
2228                         skb->truesize += count;
2229                 }
2230
2231         } else {
2232                 pg = virt_to_page(task->data);
2233
2234                 get_page(pg);
2235                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2236                                         count);
2237                 skb->len += count;
2238                 skb->data_len += count;
2239                 skb->truesize += count;
2240         }
2241
2242         if (padlen) {
2243                 i = skb_shinfo(skb)->nr_frags;
2244                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2245                                 virt_to_page(padding), offset_in_page(padding),
2246                                 padlen);
2247
2248                 skb->data_len += padlen;
2249                 skb->truesize += padlen;
2250                 skb->len += padlen;
2251         }
2252
2253         return 0;
2254 }
2255 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2256
2257 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2258 {
2259         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2260         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2261         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2262         struct sk_buff *skb = tdata->skb;
2263         unsigned int datalen;
2264         int err;
2265
2266         if (!skb) {
2267                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2268                         "task 0x%p, skb NULL.\n", task);
2269                 return 0;
2270         }
2271
2272         datalen = skb->data_len;
2273         tdata->skb = NULL;
2274         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2275         if (err > 0) {
2276                 int pdulen = err;
2277
2278                 log_debug(1 << CXGBI_DBG_PDU_TX,
2279                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2280                         task, task->sc, skb, skb->len, skb->data_len, err);
2281
2282                 if (task->conn->hdrdgst_en)
2283                         pdulen += ISCSI_DIGEST_SIZE;
2284
2285                 if (datalen && task->conn->datadgst_en)
2286                         pdulen += ISCSI_DIGEST_SIZE;
2287
2288                 task->conn->txdata_octets += pdulen;
2289                 return 0;
2290         }
2291
2292         if (err == -EAGAIN || err == -ENOBUFS) {
2293                 log_debug(1 << CXGBI_DBG_PDU_TX,
2294                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2295                         task, skb, skb->len, skb->data_len, err);
2296                 /* reset skb to send when we are called again */
2297                 tdata->skb = skb;
2298                 return err;
2299         }
2300
2301         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2302                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2303                 task->itt, skb, skb->len, skb->data_len, err);
2304
2305         kfree_skb(skb);
2306
2307         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2308         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2309         return err;
2310 }
2311 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2312
2313 void cxgbi_cleanup_task(struct iscsi_task *task)
2314 {
2315         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2316
2317         log_debug(1 << CXGBI_DBG_ISCSI,
2318                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2319                 task, tdata->skb, task->hdr_itt);
2320
2321         /*  never reached the xmit task callout */
2322         if (tdata->skb)
2323                 __kfree_skb(tdata->skb);
2324         memset(tdata, 0, sizeof(*tdata));
2325
2326         task_release_itt(task, task->hdr_itt);
2327         iscsi_tcp_cleanup_task(task);
2328 }
2329 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2330
2331 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2332                                 struct iscsi_stats *stats)
2333 {
2334         struct iscsi_conn *conn = cls_conn->dd_data;
2335
2336         stats->txdata_octets = conn->txdata_octets;
2337         stats->rxdata_octets = conn->rxdata_octets;
2338         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2339         stats->dataout_pdus = conn->dataout_pdus_cnt;
2340         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2341         stats->datain_pdus = conn->datain_pdus_cnt;
2342         stats->r2t_pdus = conn->r2t_pdus_cnt;
2343         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2344         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2345         stats->digest_err = 0;
2346         stats->timeout_err = 0;
2347         stats->custom_length = 1;
2348         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2349         stats->custom[0].value = conn->eh_abort_cnt;
2350 }
2351 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2352
2353 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2354 {
2355         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2356         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2357         struct cxgbi_device *cdev = cconn->chba->cdev;
2358         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2359         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2360         unsigned int max = max(max_def, headroom);
2361
2362         max = min(cconn->chba->cdev->tx_max_size, max);
2363         if (conn->max_xmit_dlength)
2364                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2365         else
2366                 conn->max_xmit_dlength = max;
2367         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2368
2369         return 0;
2370 }
2371
2372 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2373 {
2374         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2375         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2376         unsigned int max = cconn->chba->cdev->rx_max_size;
2377
2378         cxgbi_align_pdu_size(max);
2379
2380         if (conn->max_recv_dlength) {
2381                 if (conn->max_recv_dlength > max) {
2382                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2383                                 conn->max_recv_dlength, max);
2384                         return -EINVAL;
2385                 }
2386                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2387                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2388         } else
2389                 conn->max_recv_dlength = max;
2390
2391         return 0;
2392 }
2393
2394 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2395                         enum iscsi_param param, char *buf, int buflen)
2396 {
2397         struct iscsi_conn *conn = cls_conn->dd_data;
2398         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2399         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2400         struct cxgbi_sock *csk = cconn->cep->csk;
2401         int err;
2402
2403         log_debug(1 << CXGBI_DBG_ISCSI,
2404                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2405                 cls_conn, param, buflen, buf);
2406
2407         switch (param) {
2408         case ISCSI_PARAM_HDRDGST_EN:
2409                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2410                 if (!err && conn->hdrdgst_en)
2411                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2412                                                         conn->hdrdgst_en,
2413                                                         conn->datadgst_en, 0);
2414                 break;
2415         case ISCSI_PARAM_DATADGST_EN:
2416                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2417                 if (!err && conn->datadgst_en)
2418                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2419                                                         conn->hdrdgst_en,
2420                                                         conn->datadgst_en, 0);
2421                 break;
2422         case ISCSI_PARAM_MAX_R2T:
2423                 return iscsi_tcp_set_max_r2t(conn, buf);
2424         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2425                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2426                 if (!err)
2427                         err = cxgbi_conn_max_recv_dlength(conn);
2428                 break;
2429         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2430                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2431                 if (!err)
2432                         err = cxgbi_conn_max_xmit_dlength(conn);
2433                 break;
2434         default:
2435                 return iscsi_set_param(cls_conn, param, buf, buflen);
2436         }
2437         return err;
2438 }
2439 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2440
2441 static inline int csk_print_port(struct cxgbi_sock *csk, char *buf)
2442 {
2443         int len;
2444
2445         cxgbi_sock_get(csk);
2446         len = sprintf(buf, "%hu\n", ntohs(csk->daddr.sin_port));
2447         cxgbi_sock_put(csk);
2448
2449         return len;
2450 }
2451
2452 static inline int csk_print_ip(struct cxgbi_sock *csk, char *buf)
2453 {
2454         int len;
2455
2456         cxgbi_sock_get(csk);
2457         if (csk->csk_family == AF_INET)
2458                 len = sprintf(buf, "%pI4",
2459                               &csk->daddr.sin_addr.s_addr);
2460         else
2461                 len = sprintf(buf, "%pI6",
2462                               &csk->daddr6.sin6_addr);
2463
2464         cxgbi_sock_put(csk);
2465
2466         return len;
2467 }
2468
2469 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2470                        char *buf)
2471 {
2472         struct cxgbi_endpoint *cep = ep->dd_data;
2473         struct cxgbi_sock *csk;
2474         int len;
2475
2476         log_debug(1 << CXGBI_DBG_ISCSI,
2477                 "cls_conn 0x%p, param %d.\n", ep, param);
2478
2479         switch (param) {
2480         case ISCSI_PARAM_CONN_PORT:
2481         case ISCSI_PARAM_CONN_ADDRESS:
2482                 if (!cep)
2483                         return -ENOTCONN;
2484
2485                 csk = cep->csk;
2486                 if (!csk)
2487                         return -ENOTCONN;
2488
2489                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2490                                                  &csk->daddr, param, buf);
2491         default:
2492                 return -ENOSYS;
2493         }
2494         return len;
2495 }
2496 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2497
2498 struct iscsi_cls_conn *
2499 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2500 {
2501         struct iscsi_cls_conn *cls_conn;
2502         struct iscsi_conn *conn;
2503         struct iscsi_tcp_conn *tcp_conn;
2504         struct cxgbi_conn *cconn;
2505
2506         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2507         if (!cls_conn)
2508                 return NULL;
2509
2510         conn = cls_conn->dd_data;
2511         tcp_conn = conn->dd_data;
2512         cconn = tcp_conn->dd_data;
2513         cconn->iconn = conn;
2514
2515         log_debug(1 << CXGBI_DBG_ISCSI,
2516                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2517                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2518
2519         return cls_conn;
2520 }
2521 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2522
2523 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2524                                 struct iscsi_cls_conn *cls_conn,
2525                                 u64 transport_eph, int is_leading)
2526 {
2527         struct iscsi_conn *conn = cls_conn->dd_data;
2528         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2529         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2530         struct iscsi_endpoint *ep;
2531         struct cxgbi_endpoint *cep;
2532         struct cxgbi_sock *csk;
2533         int err;
2534
2535         ep = iscsi_lookup_endpoint(transport_eph);
2536         if (!ep)
2537                 return -EINVAL;
2538
2539         /*  setup ddp pagesize */
2540         cep = ep->dd_data;
2541         csk = cep->csk;
2542         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid, page_idx, 0);
2543         if (err < 0)
2544                 return err;
2545
2546         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2547         if (err)
2548                 return -EINVAL;
2549
2550         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2551         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2552
2553         write_lock_bh(&csk->callback_lock);
2554         csk->user_data = conn;
2555         cconn->chba = cep->chba;
2556         cconn->cep = cep;
2557         cep->cconn = cconn;
2558         write_unlock_bh(&csk->callback_lock);
2559
2560         cxgbi_conn_max_xmit_dlength(conn);
2561         cxgbi_conn_max_recv_dlength(conn);
2562
2563         log_debug(1 << CXGBI_DBG_ISCSI,
2564                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2565                 cls_session, cls_conn, ep, cconn, csk);
2566         /*  init recv engine */
2567         iscsi_tcp_hdr_recv_prep(tcp_conn);
2568
2569         return 0;
2570 }
2571 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2572
2573 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2574                                                 u16 cmds_max, u16 qdepth,
2575                                                 u32 initial_cmdsn)
2576 {
2577         struct cxgbi_endpoint *cep;
2578         struct cxgbi_hba *chba;
2579         struct Scsi_Host *shost;
2580         struct iscsi_cls_session *cls_session;
2581         struct iscsi_session *session;
2582
2583         if (!ep) {
2584                 pr_err("missing endpoint.\n");
2585                 return NULL;
2586         }
2587
2588         cep = ep->dd_data;
2589         chba = cep->chba;
2590         shost = chba->shost;
2591
2592         BUG_ON(chba != iscsi_host_priv(shost));
2593
2594         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2595                                         cmds_max, 0,
2596                                         sizeof(struct iscsi_tcp_task) +
2597                                         sizeof(struct cxgbi_task_data),
2598                                         initial_cmdsn, ISCSI_MAX_TARGET);
2599         if (!cls_session)
2600                 return NULL;
2601
2602         session = cls_session->dd_data;
2603         if (iscsi_tcp_r2tpool_alloc(session))
2604                 goto remove_session;
2605
2606         log_debug(1 << CXGBI_DBG_ISCSI,
2607                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2608         return cls_session;
2609
2610 remove_session:
2611         iscsi_session_teardown(cls_session);
2612         return NULL;
2613 }
2614 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2615
2616 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2617 {
2618         log_debug(1 << CXGBI_DBG_ISCSI,
2619                 "cls sess 0x%p.\n", cls_session);
2620
2621         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2622         iscsi_session_teardown(cls_session);
2623 }
2624 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2625
2626 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2627                         char *buf, int buflen)
2628 {
2629         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2630
2631         if (!chba->ndev) {
2632                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2633                                 "netdev for host not set.\n");
2634                 return -ENODEV;
2635         }
2636
2637         log_debug(1 << CXGBI_DBG_ISCSI,
2638                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2639                 shost, chba, chba->ndev->name, param, buflen, buf);
2640
2641         switch (param) {
2642         case ISCSI_HOST_PARAM_IPADDRESS:
2643         {
2644                 __be32 addr = in_aton(buf);
2645                 log_debug(1 << CXGBI_DBG_ISCSI,
2646                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2647                 cxgbi_set_iscsi_ipv4(chba, addr);
2648                 return 0;
2649         }
2650         case ISCSI_HOST_PARAM_HWADDRESS:
2651         case ISCSI_HOST_PARAM_NETDEV_NAME:
2652                 return 0;
2653         default:
2654                 return iscsi_host_set_param(shost, param, buf, buflen);
2655         }
2656 }
2657 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2658
2659 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2660                         char *buf)
2661 {
2662         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2663         int len = 0;
2664
2665         if (!chba->ndev) {
2666                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2667                                 "netdev for host not set.\n");
2668                 return -ENODEV;
2669         }
2670
2671         log_debug(1 << CXGBI_DBG_ISCSI,
2672                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2673                 shost, chba, chba->ndev->name, param);
2674
2675         switch (param) {
2676         case ISCSI_HOST_PARAM_HWADDRESS:
2677                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2678                 break;
2679         case ISCSI_HOST_PARAM_NETDEV_NAME:
2680                 len = sprintf(buf, "%s\n", chba->ndev->name);
2681                 break;
2682         case ISCSI_HOST_PARAM_IPADDRESS:
2683         {
2684                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2685                                                            chba->port_id);
2686                 if (csk) {
2687                         len = sprintf(buf, "%pIS",
2688                                       (struct sockaddr *)&csk->saddr);
2689                 }
2690                 log_debug(1 << CXGBI_DBG_ISCSI,
2691                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2692                 break;
2693         }
2694         default:
2695                 return iscsi_host_get_param(shost, param, buf);
2696         }
2697
2698         return len;
2699 }
2700 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2701
2702 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2703                                         struct sockaddr *dst_addr,
2704                                         int non_blocking)
2705 {
2706         struct iscsi_endpoint *ep;
2707         struct cxgbi_endpoint *cep;
2708         struct cxgbi_hba *hba = NULL;
2709         struct cxgbi_sock *csk;
2710         int err = -EINVAL;
2711
2712         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2713                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2714                 shost, non_blocking, dst_addr);
2715
2716         if (shost) {
2717                 hba = iscsi_host_priv(shost);
2718                 if (!hba) {
2719                         pr_info("shost 0x%p, priv NULL.\n", shost);
2720                         goto err_out;
2721                 }
2722         }
2723
2724         if (dst_addr->sa_family == AF_INET) {
2725                 csk = cxgbi_check_route(dst_addr);
2726 #if IS_ENABLED(CONFIG_IPV6)
2727         } else if (dst_addr->sa_family == AF_INET6) {
2728                 csk = cxgbi_check_route6(dst_addr);
2729 #endif
2730         } else {
2731                 pr_info("address family 0x%x NOT supported.\n",
2732                         dst_addr->sa_family);
2733                 err = -EAFNOSUPPORT;
2734                 return (struct iscsi_endpoint *)ERR_PTR(err);
2735         }
2736
2737         if (IS_ERR(csk))
2738                 return (struct iscsi_endpoint *)csk;
2739         cxgbi_sock_get(csk);
2740
2741         if (!hba)
2742                 hba = csk->cdev->hbas[csk->port_id];
2743         else if (hba != csk->cdev->hbas[csk->port_id]) {
2744                 pr_info("Could not connect through requested host %u"
2745                         "hba 0x%p != 0x%p (%u).\n",
2746                         shost->host_no, hba,
2747                         csk->cdev->hbas[csk->port_id], csk->port_id);
2748                 err = -ENOSPC;
2749                 goto release_conn;
2750         }
2751
2752         err = sock_get_port(csk);
2753         if (err)
2754                 goto release_conn;
2755
2756         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2757         err = csk->cdev->csk_init_act_open(csk);
2758         if (err)
2759                 goto release_conn;
2760
2761         if (cxgbi_sock_is_closing(csk)) {
2762                 err = -ENOSPC;
2763                 pr_info("csk 0x%p is closing.\n", csk);
2764                 goto release_conn;
2765         }
2766
2767         ep = iscsi_create_endpoint(sizeof(*cep));
2768         if (!ep) {
2769                 err = -ENOMEM;
2770                 pr_info("iscsi alloc ep, OOM.\n");
2771                 goto release_conn;
2772         }
2773
2774         cep = ep->dd_data;
2775         cep->csk = csk;
2776         cep->chba = hba;
2777
2778         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2779                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2780                 ep, cep, csk, hba, hba->ndev->name);
2781         return ep;
2782
2783 release_conn:
2784         cxgbi_sock_put(csk);
2785         cxgbi_sock_closed(csk);
2786 err_out:
2787         return ERR_PTR(err);
2788 }
2789 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2790
2791 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2792 {
2793         struct cxgbi_endpoint *cep = ep->dd_data;
2794         struct cxgbi_sock *csk = cep->csk;
2795
2796         if (!cxgbi_sock_is_established(csk))
2797                 return 0;
2798         return 1;
2799 }
2800 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2801
2802 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2803 {
2804         struct cxgbi_endpoint *cep = ep->dd_data;
2805         struct cxgbi_conn *cconn = cep->cconn;
2806         struct cxgbi_sock *csk = cep->csk;
2807
2808         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2809                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2810                 ep, cep, cconn, csk, csk->state, csk->flags);
2811
2812         if (cconn && cconn->iconn) {
2813                 iscsi_suspend_tx(cconn->iconn);
2814                 write_lock_bh(&csk->callback_lock);
2815                 cep->csk->user_data = NULL;
2816                 cconn->cep = NULL;
2817                 write_unlock_bh(&csk->callback_lock);
2818         }
2819         iscsi_destroy_endpoint(ep);
2820
2821         if (likely(csk->state >= CTP_ESTABLISHED))
2822                 need_active_close(csk);
2823         else
2824                 cxgbi_sock_closed(csk);
2825
2826         cxgbi_sock_put(csk);
2827 }
2828 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2829
2830 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2831                         struct scsi_transport_template **stt)
2832 {
2833         *stt = iscsi_register_transport(itp);
2834         if (*stt == NULL) {
2835                 pr_err("unable to register %s transport 0x%p.\n",
2836                         itp->name, itp);
2837                 return -ENODEV;
2838         }
2839         log_debug(1 << CXGBI_DBG_ISCSI,
2840                 "%s, registered iscsi transport 0x%p.\n",
2841                 itp->name, stt);
2842         return 0;
2843 }
2844 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2845
2846 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2847                         struct scsi_transport_template **stt)
2848 {
2849         if (*stt) {
2850                 log_debug(1 << CXGBI_DBG_ISCSI,
2851                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2852                         itp, itp->name, *stt);
2853                 *stt = NULL;
2854                 iscsi_unregister_transport(itp);
2855         }
2856 }
2857 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2858
2859 umode_t cxgbi_attr_is_visible(int param_type, int param)
2860 {
2861         switch (param_type) {
2862         case ISCSI_HOST_PARAM:
2863                 switch (param) {
2864                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2865                 case ISCSI_HOST_PARAM_HWADDRESS:
2866                 case ISCSI_HOST_PARAM_IPADDRESS:
2867                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2868                         return S_IRUGO;
2869                 default:
2870                         return 0;
2871                 }
2872         case ISCSI_PARAM:
2873                 switch (param) {
2874                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2875                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2876                 case ISCSI_PARAM_HDRDGST_EN:
2877                 case ISCSI_PARAM_DATADGST_EN:
2878                 case ISCSI_PARAM_CONN_ADDRESS:
2879                 case ISCSI_PARAM_CONN_PORT:
2880                 case ISCSI_PARAM_EXP_STATSN:
2881                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2882                 case ISCSI_PARAM_PERSISTENT_PORT:
2883                 case ISCSI_PARAM_PING_TMO:
2884                 case ISCSI_PARAM_RECV_TMO:
2885                 case ISCSI_PARAM_INITIAL_R2T_EN:
2886                 case ISCSI_PARAM_MAX_R2T:
2887                 case ISCSI_PARAM_IMM_DATA_EN:
2888                 case ISCSI_PARAM_FIRST_BURST:
2889                 case ISCSI_PARAM_MAX_BURST:
2890                 case ISCSI_PARAM_PDU_INORDER_EN:
2891                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2892                 case ISCSI_PARAM_ERL:
2893                 case ISCSI_PARAM_TARGET_NAME:
2894                 case ISCSI_PARAM_TPGT:
2895                 case ISCSI_PARAM_USERNAME:
2896                 case ISCSI_PARAM_PASSWORD:
2897                 case ISCSI_PARAM_USERNAME_IN:
2898                 case ISCSI_PARAM_PASSWORD_IN:
2899                 case ISCSI_PARAM_FAST_ABORT:
2900                 case ISCSI_PARAM_ABORT_TMO:
2901                 case ISCSI_PARAM_LU_RESET_TMO:
2902                 case ISCSI_PARAM_TGT_RESET_TMO:
2903                 case ISCSI_PARAM_IFACE_NAME:
2904                 case ISCSI_PARAM_INITIATOR_NAME:
2905                         return S_IRUGO;
2906                 default:
2907                         return 0;
2908                 }
2909         }
2910
2911         return 0;
2912 }
2913 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2914
2915 static int __init libcxgbi_init_module(void)
2916 {
2917         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
2918         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
2919
2920         pr_info("%s", version);
2921
2922         pr_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
2923                 ISCSI_ITT_MASK, sw_tag_idx_bits,
2924                 ISCSI_AGE_MASK, sw_tag_age_bits);
2925
2926         ddp_setup_host_page_size();
2927         return 0;
2928 }
2929
2930 static void __exit libcxgbi_exit_module(void)
2931 {
2932         cxgbi_device_unregister_all(0xFF);
2933         return;
2934 }
2935
2936 module_init(libcxgbi_init_module);
2937 module_exit(libcxgbi_exit_module);