kernel/drivers/infiniband/hw/usnic/usnic_ib_main.c

   1 /*
   2  * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * Author: Upinder Malhi <umalhi@cisco.com>
  33  * Author: Anant Deepak <anadeepa@cisco.com>
  34  * Author: Cesare Cantu' <cantuc@cisco.com>
  35  * Author: Jeff Squyres <jsquyres@cisco.com>
  36  * Author: Kiran Thirumalai <kithirum@cisco.com>
  37  * Author: Xuyang Wang <xuywang@cisco.com>
  38  * Author: Reese Faucette <rfaucett@cisco.com>
  39  *
  40  */
  41
  42 #include <linux/module.h>
  43 #include <linux/inetdevice.h>
  44 #include <linux/init.h>
  45 #include <linux/slab.h>
  46 #include <linux/errno.h>
  47 #include <linux/pci.h>
  48 #include <linux/netdevice.h>
  49
  50 #include <rdma/ib_user_verbs.h>
  51 #include <rdma/ib_addr.h>
  52
  53 #include "usnic_abi.h"
  54 #include "usnic_common_util.h"
  55 #include "usnic_ib.h"
  56 #include "usnic_ib_qp_grp.h"
  57 #include "usnic_log.h"
  58 #include "usnic_fwd.h"
  59 #include "usnic_debugfs.h"
  60 #include "usnic_ib_verbs.h"
  61 #include "usnic_transport.h"
  62 #include "usnic_uiom.h"
  63 #include "usnic_ib_sysfs.h"
  64
  65 unsigned int usnic_log_lvl = USNIC_LOG_LVL_ERR;
  66 unsigned int usnic_ib_share_vf = 1;
  67
  68 static const char usnic_version[] =
  69         DRV_NAME ": Cisco VIC (USNIC) Verbs Driver v"
  70         DRV_VERSION " (" DRV_RELDATE ")\n";
  71
  72 static DEFINE_MUTEX(usnic_ib_ibdev_list_lock);
  73 static LIST_HEAD(usnic_ib_ibdev_list);
  74
  75 /* Callback dump funcs */
  76 static int usnic_ib_dump_vf_hdr(void *obj, char *buf, int buf_sz)
  77 {
  78         struct usnic_ib_vf *vf = obj;
  79         return scnprintf(buf, buf_sz, "PF: %s ", vf->pf->ib_dev.name);
  80 }
  81 /* End callback dump funcs */
  82
  83 static void usnic_ib_dump_vf(struct usnic_ib_vf *vf, char *buf, int buf_sz)
  84 {
  85         usnic_vnic_dump(vf->vnic, buf, buf_sz, vf,
  86                         usnic_ib_dump_vf_hdr,
  87                         usnic_ib_qp_grp_dump_hdr, usnic_ib_qp_grp_dump_rows);
  88 }
  89
  90 void usnic_ib_log_vf(struct usnic_ib_vf *vf)
  91 {
  92         char buf[1000];
  93         usnic_ib_dump_vf(vf, buf, sizeof(buf));
  94         usnic_dbg("%s\n", buf);
  95 }
  96
  97 /* Start of netdev section */
  98 static inline const char *usnic_ib_netdev_event_to_string(unsigned long event)
  99 {
 100         const char *event2str[] = {"NETDEV_NONE", "NETDEV_UP", "NETDEV_DOWN",
 101                 "NETDEV_REBOOT", "NETDEV_CHANGE",
 102                 "NETDEV_REGISTER", "NETDEV_UNREGISTER", "NETDEV_CHANGEMTU",
 103                 "NETDEV_CHANGEADDR", "NETDEV_GOING_DOWN", "NETDEV_FEAT_CHANGE",
 104                 "NETDEV_BONDING_FAILOVER", "NETDEV_PRE_UP",
 105                 "NETDEV_PRE_TYPE_CHANGE", "NETDEV_POST_TYPE_CHANGE",
 106                 "NETDEV_POST_INT", "NETDEV_UNREGISTER_FINAL", "NETDEV_RELEASE",
 107                 "NETDEV_NOTIFY_PEERS", "NETDEV_JOIN"
 108         };
 109
 110         if (event >= ARRAY_SIZE(event2str))
 111                 return "UNKNOWN_NETDEV_EVENT";
 112         else
 113                 return event2str[event];
 114 }
 115
 116 static void usnic_ib_qp_grp_modify_active_to_err(struct usnic_ib_dev *us_ibdev)
 117 {
 118         struct usnic_ib_ucontext *ctx;
 119         struct usnic_ib_qp_grp *qp_grp;
 120         enum ib_qp_state cur_state;
 121         int status;
 122
 123         BUG_ON(!mutex_is_locked(&us_ibdev->usdev_lock));
 124
 125         list_for_each_entry(ctx, &us_ibdev->ctx_list, link) {
 126                 list_for_each_entry(qp_grp, &ctx->qp_grp_list, link) {
 127                         cur_state = qp_grp->state;
 128                         if (cur_state == IB_QPS_INIT ||
 129                                 cur_state == IB_QPS_RTR ||
 130                                 cur_state == IB_QPS_RTS) {
 131                                 status = usnic_ib_qp_grp_modify(qp_grp,
 132                                                                 IB_QPS_ERR,
 133                                                                 NULL);
 134                                 if (status) {
 135                                         usnic_err("Failed to transistion qp grp %u from %s to %s\n",
 136                                                 qp_grp->grp_id,
 137                                                 usnic_ib_qp_grp_state_to_string
 138                                                 (cur_state),
 139                                                 usnic_ib_qp_grp_state_to_string
 140                                                 (IB_QPS_ERR));
 141                                 }
 142                         }
 143                 }
 144         }
 145 }
 146
 147 static void usnic_ib_handle_usdev_event(struct usnic_ib_dev *us_ibdev,
 148                                         unsigned long event)
 149 {
 150         struct net_device *netdev;
 151         struct ib_event ib_event;
 152
 153         memset(&ib_event, 0, sizeof(ib_event));
 154
 155         mutex_lock(&us_ibdev->usdev_lock);
 156         netdev = us_ibdev->netdev;
 157         switch (event) {
 158         case NETDEV_REBOOT:
 159                 usnic_info("PF Reset on %s\n", us_ibdev->ib_dev.name);
 160                 usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 161                 ib_event.event = IB_EVENT_PORT_ERR;
 162                 ib_event.device = &us_ibdev->ib_dev;
 163                 ib_event.element.port_num = 1;
 164                 ib_dispatch_event(&ib_event);
 165                 break;
 166         case NETDEV_UP:
 167         case NETDEV_DOWN:
 168         case NETDEV_CHANGE:
 169                 if (!us_ibdev->ufdev->link_up &&
 170                                 netif_carrier_ok(netdev)) {
 171                         usnic_fwd_carrier_up(us_ibdev->ufdev);
 172                         usnic_info("Link UP on %s\n", us_ibdev->ib_dev.name);
 173                         ib_event.event = IB_EVENT_PORT_ACTIVE;
 174                         ib_event.device = &us_ibdev->ib_dev;
 175                         ib_event.element.port_num = 1;
 176                         ib_dispatch_event(&ib_event);
 177                 } else if (us_ibdev->ufdev->link_up &&
 178                                 !netif_carrier_ok(netdev)) {
 179                         usnic_fwd_carrier_down(us_ibdev->ufdev);
 180                         usnic_info("Link DOWN on %s\n", us_ibdev->ib_dev.name);
 181                         usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 182                         ib_event.event = IB_EVENT_PORT_ERR;
 183                         ib_event.device = &us_ibdev->ib_dev;
 184                         ib_event.element.port_num = 1;
 185                         ib_dispatch_event(&ib_event);
 186                 } else {
 187                         usnic_dbg("Ignoring %s on %s\n",
 188                                         usnic_ib_netdev_event_to_string(event),
 189                                         us_ibdev->ib_dev.name);
 190                 }
 191                 break;
 192         case NETDEV_CHANGEADDR:
 193                 if (!memcmp(us_ibdev->ufdev->mac, netdev->dev_addr,
 194                                 sizeof(us_ibdev->ufdev->mac))) {
 195                         usnic_dbg("Ignoring addr change on %s\n",
 196                                         us_ibdev->ib_dev.name);
 197                 } else {
 198                         usnic_info(" %s old mac: %pM new mac: %pM\n",
 199                                         us_ibdev->ib_dev.name,
 200                                         us_ibdev->ufdev->mac,
 201                                         netdev->dev_addr);
 202                         usnic_fwd_set_mac(us_ibdev->ufdev, netdev->dev_addr);
 203                         usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 204                         ib_event.event = IB_EVENT_GID_CHANGE;
 205                         ib_event.device = &us_ibdev->ib_dev;
 206                         ib_event.element.port_num = 1;
 207                         ib_dispatch_event(&ib_event);
 208                 }
 209
 210                 break;
 211         case NETDEV_CHANGEMTU:
 212                 if (us_ibdev->ufdev->mtu != netdev->mtu) {
 213                         usnic_info("MTU Change on %s old: %u new: %u\n",
 214                                         us_ibdev->ib_dev.name,
 215                                         us_ibdev->ufdev->mtu, netdev->mtu);
 216                         usnic_fwd_set_mtu(us_ibdev->ufdev, netdev->mtu);
 217                         usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 218                 } else {
 219                         usnic_dbg("Ignoring MTU change on %s\n",
 220                                         us_ibdev->ib_dev.name);
 221                 }
 222                 break;
 223         default:
 224                 usnic_dbg("Ignoring event %s on %s",
 225                                 usnic_ib_netdev_event_to_string(event),
 226                                 us_ibdev->ib_dev.name);
 227         }
 228         mutex_unlock(&us_ibdev->usdev_lock);
 229 }
 230
 231 static int usnic_ib_netdevice_event(struct notifier_block *notifier,
 232                                         unsigned long event, void *ptr)
 233 {
 234         struct usnic_ib_dev *us_ibdev;
 235
 236         struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
 237
 238         mutex_lock(&usnic_ib_ibdev_list_lock);
 239         list_for_each_entry(us_ibdev, &usnic_ib_ibdev_list, ib_dev_link) {
 240                 if (us_ibdev->netdev == netdev) {
 241                         usnic_ib_handle_usdev_event(us_ibdev, event);
 242                         break;
 243                 }
 244         }
 245         mutex_unlock(&usnic_ib_ibdev_list_lock);
 246
 247         return NOTIFY_DONE;
 248 }
 249
 250 static struct notifier_block usnic_ib_netdevice_notifier = {
 251         .notifier_call = usnic_ib_netdevice_event
 252 };
 253 /* End of netdev section */
 254
 255 /* Start of inet section */
 256 static int usnic_ib_handle_inet_event(struct usnic_ib_dev *us_ibdev,
 257                                         unsigned long event, void *ptr)
 258 {
 259         struct in_ifaddr *ifa = ptr;
 260         struct ib_event ib_event;
 261
 262         mutex_lock(&us_ibdev->usdev_lock);
 263
 264         switch (event) {
 265         case NETDEV_DOWN:
 266                 usnic_info("%s via ip notifiers",
 267                                 usnic_ib_netdev_event_to_string(event));
 268                 usnic_fwd_del_ipaddr(us_ibdev->ufdev);
 269                 usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 270                 ib_event.event = IB_EVENT_GID_CHANGE;
 271                 ib_event.device = &us_ibdev->ib_dev;
 272                 ib_event.element.port_num = 1;
 273                 ib_dispatch_event(&ib_event);
 274                 break;
 275         case NETDEV_UP:
 276                 usnic_fwd_add_ipaddr(us_ibdev->ufdev, ifa->ifa_address);
 277                 usnic_info("%s via ip notifiers: ip %pI4",
 278                                 usnic_ib_netdev_event_to_string(event),
 279                                 &us_ibdev->ufdev->inaddr);
 280                 ib_event.event = IB_EVENT_GID_CHANGE;
 281                 ib_event.device = &us_ibdev->ib_dev;
 282                 ib_event.element.port_num = 1;
 283                 ib_dispatch_event(&ib_event);
 284                 break;
 285         default:
 286                 usnic_info("Ignoring event %s on %s",
 287                                 usnic_ib_netdev_event_to_string(event),
 288                                 us_ibdev->ib_dev.name);
 289         }
 290         mutex_unlock(&us_ibdev->usdev_lock);
 291
 292         return NOTIFY_DONE;
 293 }
 294
 295 static int usnic_ib_inetaddr_event(struct notifier_block *notifier,
 296                                         unsigned long event, void *ptr)
 297 {
 298         struct usnic_ib_dev *us_ibdev;
 299         struct in_ifaddr *ifa = ptr;
 300         struct net_device *netdev = ifa->ifa_dev->dev;
 301
 302         mutex_lock(&usnic_ib_ibdev_list_lock);
 303         list_for_each_entry(us_ibdev, &usnic_ib_ibdev_list, ib_dev_link) {
 304                 if (us_ibdev->netdev == netdev) {
 305                         usnic_ib_handle_inet_event(us_ibdev, event, ptr);
 306                         break;
 307                 }
 308         }
 309         mutex_unlock(&usnic_ib_ibdev_list_lock);
 310
 311         return NOTIFY_DONE;
 312 }
 313 static struct notifier_block usnic_ib_inetaddr_notifier = {
 314         .notifier_call = usnic_ib_inetaddr_event
 315 };
 316 /* End of inet section*/
 317
 318 static int usnic_port_immutable(struct ib_device *ibdev, u8 port_num,
 319                                 struct ib_port_immutable *immutable)
 320 {
 321         struct ib_port_attr attr;
 322         int err;
 323
 324         err = usnic_ib_query_port(ibdev, port_num, &attr);
 325         if (err)
 326                 return err;
 327
 328         immutable->pkey_tbl_len = attr.pkey_tbl_len;
 329         immutable->gid_tbl_len = attr.gid_tbl_len;
 330
 331         return 0;
 332 }
 333
 334 /* Start of PF discovery section */
 335 static void *usnic_ib_device_add(struct pci_dev *dev)
 336 {
 337         struct usnic_ib_dev *us_ibdev;
 338         union ib_gid gid;
 339         struct in_ifaddr *in;
 340         struct net_device *netdev;
 341
 342         usnic_dbg("\n");
 343         netdev = pci_get_drvdata(dev);
 344
 345         us_ibdev = (struct usnic_ib_dev *)ib_alloc_device(sizeof(*us_ibdev));
 346         if (!us_ibdev) {
 347                 usnic_err("Device %s context alloc failed\n",
 348                                 netdev_name(pci_get_drvdata(dev)));
 349                 return ERR_PTR(-EFAULT);
 350         }
 351
 352         us_ibdev->ufdev = usnic_fwd_dev_alloc(dev);
 353         if (!us_ibdev->ufdev) {
 354                 usnic_err("Failed to alloc ufdev for %s\n", pci_name(dev));
 355                 goto err_dealloc;
 356         }
 357
 358         mutex_init(&us_ibdev->usdev_lock);
 359         INIT_LIST_HEAD(&us_ibdev->vf_dev_list);
 360         INIT_LIST_HEAD(&us_ibdev->ctx_list);
 361
 362         us_ibdev->pdev = dev;
 363         us_ibdev->netdev = pci_get_drvdata(dev);
 364         us_ibdev->ib_dev.owner = THIS_MODULE;
 365         us_ibdev->ib_dev.node_type = RDMA_NODE_USNIC_UDP;
 366         us_ibdev->ib_dev.phys_port_cnt = USNIC_IB_PORT_CNT;
 367         us_ibdev->ib_dev.num_comp_vectors = USNIC_IB_NUM_COMP_VECTORS;
 368         us_ibdev->ib_dev.dma_device = &dev->dev;
 369         us_ibdev->ib_dev.uverbs_abi_ver = USNIC_UVERBS_ABI_VERSION;
 370         strlcpy(us_ibdev->ib_dev.name, "usnic_%d", IB_DEVICE_NAME_MAX);
 371
 372         us_ibdev->ib_dev.uverbs_cmd_mask =
 373                 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
 374                 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
 375                 (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
 376                 (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
 377                 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
 378                 (1ull << IB_USER_VERBS_CMD_REG_MR) |
 379                 (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
 380                 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
 381                 (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
 382                 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
 383                 (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
 384                 (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
 385                 (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
 386                 (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
 387                 (1ull << IB_USER_VERBS_CMD_ATTACH_MCAST) |
 388                 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST) |
 389                 (1ull << IB_USER_VERBS_CMD_OPEN_QP);
 390
 391         us_ibdev->ib_dev.query_device = usnic_ib_query_device;
 392         us_ibdev->ib_dev.query_port = usnic_ib_query_port;
 393         us_ibdev->ib_dev.query_pkey = usnic_ib_query_pkey;
 394         us_ibdev->ib_dev.query_gid = usnic_ib_query_gid;
 395         us_ibdev->ib_dev.get_link_layer = usnic_ib_port_link_layer;
 396         us_ibdev->ib_dev.alloc_pd = usnic_ib_alloc_pd;
 397         us_ibdev->ib_dev.dealloc_pd = usnic_ib_dealloc_pd;
 398         us_ibdev->ib_dev.create_qp = usnic_ib_create_qp;
 399         us_ibdev->ib_dev.modify_qp = usnic_ib_modify_qp;
 400         us_ibdev->ib_dev.query_qp = usnic_ib_query_qp;
 401         us_ibdev->ib_dev.destroy_qp = usnic_ib_destroy_qp;
 402         us_ibdev->ib_dev.create_cq = usnic_ib_create_cq;
 403         us_ibdev->ib_dev.destroy_cq = usnic_ib_destroy_cq;
 404         us_ibdev->ib_dev.reg_user_mr = usnic_ib_reg_mr;
 405         us_ibdev->ib_dev.dereg_mr = usnic_ib_dereg_mr;
 406         us_ibdev->ib_dev.alloc_ucontext = usnic_ib_alloc_ucontext;
 407         us_ibdev->ib_dev.dealloc_ucontext = usnic_ib_dealloc_ucontext;
 408         us_ibdev->ib_dev.mmap = usnic_ib_mmap;
 409         us_ibdev->ib_dev.create_ah = usnic_ib_create_ah;
 410         us_ibdev->ib_dev.destroy_ah = usnic_ib_destroy_ah;
 411         us_ibdev->ib_dev.post_send = usnic_ib_post_send;
 412         us_ibdev->ib_dev.post_recv = usnic_ib_post_recv;
 413         us_ibdev->ib_dev.poll_cq = usnic_ib_poll_cq;
 414         us_ibdev->ib_dev.req_notify_cq = usnic_ib_req_notify_cq;
 415         us_ibdev->ib_dev.get_dma_mr = usnic_ib_get_dma_mr;
 416         us_ibdev->ib_dev.get_port_immutable = usnic_port_immutable;
 417
 418
 419         if (ib_register_device(&us_ibdev->ib_dev, NULL))
 420                 goto err_fwd_dealloc;
 421
 422         usnic_fwd_set_mtu(us_ibdev->ufdev, us_ibdev->netdev->mtu);
 423         usnic_fwd_set_mac(us_ibdev->ufdev, us_ibdev->netdev->dev_addr);
 424         if (netif_carrier_ok(us_ibdev->netdev))
 425                 usnic_fwd_carrier_up(us_ibdev->ufdev);
 426
 427         in = ((struct in_device *)(netdev->ip_ptr))->ifa_list;
 428         if (in != NULL)
 429                 usnic_fwd_add_ipaddr(us_ibdev->ufdev, in->ifa_address);
 430
 431         usnic_mac_ip_to_gid(us_ibdev->netdev->perm_addr,
 432                                 us_ibdev->ufdev->inaddr, &gid.raw[0]);
 433         memcpy(&us_ibdev->ib_dev.node_guid, &gid.global.interface_id,
 434                 sizeof(gid.global.interface_id));
 435         kref_init(&us_ibdev->vf_cnt);
 436
 437         usnic_info("Added ibdev: %s netdev: %s with mac %pM Link: %u MTU: %u\n",
 438                         us_ibdev->ib_dev.name, netdev_name(us_ibdev->netdev),
 439                         us_ibdev->ufdev->mac, us_ibdev->ufdev->link_up,
 440                         us_ibdev->ufdev->mtu);
 441         return us_ibdev;
 442
 443 err_fwd_dealloc:
 444         usnic_fwd_dev_free(us_ibdev->ufdev);
 445 err_dealloc:
 446         usnic_err("failed -- deallocing device\n");
 447         ib_dealloc_device(&us_ibdev->ib_dev);
 448         return NULL;
 449 }
 450
 451 static void usnic_ib_device_remove(struct usnic_ib_dev *us_ibdev)
 452 {
 453         usnic_info("Unregistering %s\n", us_ibdev->ib_dev.name);
 454         usnic_ib_sysfs_unregister_usdev(us_ibdev);
 455         usnic_fwd_dev_free(us_ibdev->ufdev);
 456         ib_unregister_device(&us_ibdev->ib_dev);
 457         ib_dealloc_device(&us_ibdev->ib_dev);
 458 }
 459
 460 static void usnic_ib_undiscover_pf(struct kref *kref)
 461 {
 462         struct usnic_ib_dev *us_ibdev, *tmp;
 463         struct pci_dev *dev;
 464         bool found = false;
 465
 466         dev = container_of(kref, struct usnic_ib_dev, vf_cnt)->pdev;
 467         mutex_lock(&usnic_ib_ibdev_list_lock);
 468         list_for_each_entry_safe(us_ibdev, tmp,
 469                                 &usnic_ib_ibdev_list, ib_dev_link) {
 470                 if (us_ibdev->pdev == dev) {
 471                         list_del(&us_ibdev->ib_dev_link);
 472                         usnic_ib_device_remove(us_ibdev);
 473                         found = true;
 474                         break;
 475                 }
 476         }
 477
 478         WARN(!found, "Failed to remove PF %s\n", pci_name(dev));
 479
 480         mutex_unlock(&usnic_ib_ibdev_list_lock);
 481 }
 482
 483 static struct usnic_ib_dev *usnic_ib_discover_pf(struct usnic_vnic *vnic)
 484 {
 485         struct usnic_ib_dev *us_ibdev;
 486         struct pci_dev *parent_pci, *vf_pci;
 487         int err;
 488
 489         vf_pci = usnic_vnic_get_pdev(vnic);
 490         parent_pci = pci_physfn(vf_pci);
 491
 492         BUG_ON(!parent_pci);
 493
 494         mutex_lock(&usnic_ib_ibdev_list_lock);
 495         list_for_each_entry(us_ibdev, &usnic_ib_ibdev_list, ib_dev_link) {
 496                 if (us_ibdev->pdev == parent_pci) {
 497                         kref_get(&us_ibdev->vf_cnt);
 498                         goto out;
 499                 }
 500         }
 501
 502         us_ibdev = usnic_ib_device_add(parent_pci);
 503         if (IS_ERR_OR_NULL(us_ibdev)) {
 504                 us_ibdev = us_ibdev ? us_ibdev : ERR_PTR(-EFAULT);
 505                 goto out;
 506         }
 507
 508         err = usnic_ib_sysfs_register_usdev(us_ibdev);
 509         if (err) {
 510                 usnic_ib_device_remove(us_ibdev);
 511                 us_ibdev = ERR_PTR(err);
 512                 goto out;
 513         }
 514
 515         list_add(&us_ibdev->ib_dev_link, &usnic_ib_ibdev_list);
 516 out:
 517         mutex_unlock(&usnic_ib_ibdev_list_lock);
 518         return us_ibdev;
 519 }
 520 /* End of PF discovery section */
 521
 522 /* Start of PCI section */
 523
 524 static const struct pci_device_id usnic_ib_pci_ids[] = {
 525         {PCI_DEVICE(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_CISCO_VIC_USPACE_NIC)},
 526         {0,}
 527 };
 528
 529 static int usnic_ib_pci_probe(struct pci_dev *pdev,
 530                                 const struct pci_device_id *id)
 531 {
 532         int err;
 533         struct usnic_ib_dev *pf;
 534         struct usnic_ib_vf *vf;
 535         enum usnic_vnic_res_type res_type;
 536
 537         vf = kzalloc(sizeof(*vf), GFP_KERNEL);
 538         if (!vf)
 539                 return -ENOMEM;
 540
 541         err = pci_enable_device(pdev);
 542         if (err) {
 543                 usnic_err("Failed to enable %s with err %d\n",
 544                                 pci_name(pdev), err);
 545                 goto out_clean_vf;
 546         }
 547
 548         err = pci_request_regions(pdev, DRV_NAME);
 549         if (err) {
 550                 usnic_err("Failed to request region for %s with err %d\n",
 551                                 pci_name(pdev), err);
 552                 goto out_disable_device;
 553         }
 554
 555         pci_set_master(pdev);
 556         pci_set_drvdata(pdev, vf);
 557
 558         vf->vnic = usnic_vnic_alloc(pdev);
 559         if (IS_ERR_OR_NULL(vf->vnic)) {
 560                 err = vf->vnic ? PTR_ERR(vf->vnic) : -ENOMEM;
 561                 usnic_err("Failed to alloc vnic for %s with err %d\n",
 562                                 pci_name(pdev), err);
 563                 goto out_release_regions;
 564         }
 565
 566         pf = usnic_ib_discover_pf(vf->vnic);
 567         if (IS_ERR_OR_NULL(pf)) {
 568                 usnic_err("Failed to discover pf of vnic %s with err%ld\n",
 569                                 pci_name(pdev), PTR_ERR(pf));
 570                 err = pf ? PTR_ERR(pf) : -EFAULT;
 571                 goto out_clean_vnic;
 572         }
 573
 574         vf->pf = pf;
 575         spin_lock_init(&vf->lock);
 576         mutex_lock(&pf->usdev_lock);
 577         list_add_tail(&vf->link, &pf->vf_dev_list);
 578         /*
 579          * Save max settings (will be same for each VF, easier to re-write than
 580          * to say "if (!set) { set_values(); set=1; }
 581          */
 582         for (res_type = USNIC_VNIC_RES_TYPE_EOL+1;
 583                         res_type < USNIC_VNIC_RES_TYPE_MAX;
 584                         res_type++) {
 585                 pf->vf_res_cnt[res_type] = usnic_vnic_res_cnt(vf->vnic,
 586                                                                 res_type);
 587         }
 588
 589         mutex_unlock(&pf->usdev_lock);
 590
 591         usnic_info("Registering usnic VF %s into PF %s\n", pci_name(pdev),
 592                         pf->ib_dev.name);
 593         usnic_ib_log_vf(vf);
 594         return 0;
 595
 596 out_clean_vnic:
 597         usnic_vnic_free(vf->vnic);
 598 out_release_regions:
 599         pci_set_drvdata(pdev, NULL);
 600         pci_clear_master(pdev);
 601         pci_release_regions(pdev);
 602 out_disable_device:
 603         pci_disable_device(pdev);
 604 out_clean_vf:
 605         kfree(vf);
 606         return err;
 607 }
 608
 609 static void usnic_ib_pci_remove(struct pci_dev *pdev)
 610 {
 611         struct usnic_ib_vf *vf = pci_get_drvdata(pdev);
 612         struct usnic_ib_dev *pf = vf->pf;
 613
 614         mutex_lock(&pf->usdev_lock);
 615         list_del(&vf->link);
 616         mutex_unlock(&pf->usdev_lock);
 617
 618         kref_put(&pf->vf_cnt, usnic_ib_undiscover_pf);
 619         usnic_vnic_free(vf->vnic);
 620         pci_set_drvdata(pdev, NULL);
 621         pci_clear_master(pdev);
 622         pci_release_regions(pdev);
 623         pci_disable_device(pdev);
 624         kfree(vf);
 625
 626         usnic_info("Removed VF %s\n", pci_name(pdev));
 627 }
 628
 629 /* PCI driver entry points */
 630 static struct pci_driver usnic_ib_pci_driver = {
 631         .name = DRV_NAME,
 632         .id_table = usnic_ib_pci_ids,
 633         .probe = usnic_ib_pci_probe,
 634         .remove = usnic_ib_pci_remove,
 635 };
 636 /* End of PCI section */
 637
 638 /* Start of module section */
 639 static int __init usnic_ib_init(void)
 640 {
 641         int err;
 642
 643         printk_once(KERN_INFO "%s", usnic_version);
 644
 645         err = usnic_uiom_init(DRV_NAME);
 646         if (err) {
 647                 usnic_err("Unable to initalize umem with err %d\n", err);
 648                 return err;
 649         }
 650
 651         if (pci_register_driver(&usnic_ib_pci_driver)) {
 652                 usnic_err("Unable to register with PCI\n");
 653                 goto out_umem_fini;
 654         }
 655
 656         err = register_netdevice_notifier(&usnic_ib_netdevice_notifier);
 657         if (err) {
 658                 usnic_err("Failed to register netdev notifier\n");
 659                 goto out_pci_unreg;
 660         }
 661
 662         err = register_inetaddr_notifier(&usnic_ib_inetaddr_notifier);
 663         if (err) {
 664                 usnic_err("Failed to register inet addr notifier\n");
 665                 goto out_unreg_netdev_notifier;
 666         }
 667
 668         err = usnic_transport_init();
 669         if (err) {
 670                 usnic_err("Failed to initialize transport\n");
 671                 goto out_unreg_inetaddr_notifier;
 672         }
 673
 674         usnic_debugfs_init();
 675
 676         return 0;
 677
 678 out_unreg_inetaddr_notifier:
 679         unregister_inetaddr_notifier(&usnic_ib_inetaddr_notifier);
 680 out_unreg_netdev_notifier:
 681         unregister_netdevice_notifier(&usnic_ib_netdevice_notifier);
 682 out_pci_unreg:
 683         pci_unregister_driver(&usnic_ib_pci_driver);
 684 out_umem_fini:
 685         usnic_uiom_fini();
 686
 687         return err;
 688 }
 689
 690 static void __exit usnic_ib_destroy(void)
 691 {
 692         usnic_dbg("\n");
 693         usnic_debugfs_exit();
 694         usnic_transport_fini();
 695         unregister_inetaddr_notifier(&usnic_ib_inetaddr_notifier);
 696         unregister_netdevice_notifier(&usnic_ib_netdevice_notifier);
 697         pci_unregister_driver(&usnic_ib_pci_driver);
 698         usnic_uiom_fini();
 699 }
 700
 701 MODULE_DESCRIPTION("Cisco VIC (usNIC) Verbs Driver");
 702 MODULE_AUTHOR("Upinder Malhi <umalhi@cisco.com>");
 703 MODULE_LICENSE("Dual BSD/GPL");
 704 MODULE_VERSION(DRV_VERSION);
 705 module_param(usnic_log_lvl, uint, S_IRUGO | S_IWUSR);
 706 module_param(usnic_ib_share_vf, uint, S_IRUGO | S_IWUSR);
 707 MODULE_PARM_DESC(usnic_log_lvl, " Off=0, Err=1, Info=2, Debug=3");
 708 MODULE_PARM_DESC(usnic_ib_share_vf, "Off=0, On=1 VF sharing amongst QPs");
 709 MODULE_DEVICE_TABLE(pci, usnic_ib_pci_ids);
 710
 711 module_init(usnic_ib_init);
 712 module_exit(usnic_ib_destroy);
 713 /* End of module section */