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 ", dev_name(&vf->pf->ib_dev.dev));
  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 void usnic_ib_qp_grp_modify_active_to_err(struct usnic_ib_dev *us_ibdev)
  99 {
 100         struct usnic_ib_ucontext *ctx;
 101         struct usnic_ib_qp_grp *qp_grp;
 102         enum ib_qp_state cur_state;
 103         int status;
 104
 105         BUG_ON(!mutex_is_locked(&us_ibdev->usdev_lock));
 106
 107         list_for_each_entry(ctx, &us_ibdev->ctx_list, link) {
 108                 list_for_each_entry(qp_grp, &ctx->qp_grp_list, link) {
 109                         cur_state = qp_grp->state;
 110                         if (cur_state == IB_QPS_INIT ||
 111                                 cur_state == IB_QPS_RTR ||
 112                                 cur_state == IB_QPS_RTS) {
 113                                 status = usnic_ib_qp_grp_modify(qp_grp,
 114                                                                 IB_QPS_ERR,
 115                                                                 NULL);
 116                                 if (status) {
 117                                         usnic_err("Failed to transistion qp grp %u from %s to %s\n",
 118                                                 qp_grp->grp_id,
 119                                                 usnic_ib_qp_grp_state_to_string
 120                                                 (cur_state),
 121                                                 usnic_ib_qp_grp_state_to_string
 122                                                 (IB_QPS_ERR));
 123                                 }
 124                         }
 125                 }
 126         }
 127 }
 128
 129 static void usnic_ib_handle_usdev_event(struct usnic_ib_dev *us_ibdev,
 130                                         unsigned long event)
 131 {
 132         struct net_device *netdev;
 133         struct ib_event ib_event;
 134
 135         memset(&ib_event, 0, sizeof(ib_event));
 136
 137         mutex_lock(&us_ibdev->usdev_lock);
 138         netdev = us_ibdev->netdev;
 139         switch (event) {
 140         case NETDEV_REBOOT:
 141                 usnic_info("PF Reset on %s\n", dev_name(&us_ibdev->ib_dev.dev));
 142                 usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 143                 ib_event.event = IB_EVENT_PORT_ERR;
 144                 ib_event.device = &us_ibdev->ib_dev;
 145                 ib_event.element.port_num = 1;
 146                 ib_dispatch_event(&ib_event);
 147                 break;
 148         case NETDEV_UP:
 149         case NETDEV_DOWN:
 150         case NETDEV_CHANGE:
 151                 if (!us_ibdev->ufdev->link_up &&
 152                                 netif_carrier_ok(netdev)) {
 153                         usnic_fwd_carrier_up(us_ibdev->ufdev);
 154                         usnic_info("Link UP on %s\n",
 155                                    dev_name(&us_ibdev->ib_dev.dev));
 156                         ib_event.event = IB_EVENT_PORT_ACTIVE;
 157                         ib_event.device = &us_ibdev->ib_dev;
 158                         ib_event.element.port_num = 1;
 159                         ib_dispatch_event(&ib_event);
 160                 } else if (us_ibdev->ufdev->link_up &&
 161                                 !netif_carrier_ok(netdev)) {
 162                         usnic_fwd_carrier_down(us_ibdev->ufdev);
 163                         usnic_info("Link DOWN on %s\n",
 164                                    dev_name(&us_ibdev->ib_dev.dev));
 165                         usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 166                         ib_event.event = IB_EVENT_PORT_ERR;
 167                         ib_event.device = &us_ibdev->ib_dev;
 168                         ib_event.element.port_num = 1;
 169                         ib_dispatch_event(&ib_event);
 170                 } else {
 171                         usnic_dbg("Ignoring %s on %s\n",
 172                                         netdev_cmd_to_name(event),
 173                                         dev_name(&us_ibdev->ib_dev.dev));
 174                 }
 175                 break;
 176         case NETDEV_CHANGEADDR:
 177                 if (!memcmp(us_ibdev->ufdev->mac, netdev->dev_addr,
 178                                 sizeof(us_ibdev->ufdev->mac))) {
 179                         usnic_dbg("Ignoring addr change on %s\n",
 180                                   dev_name(&us_ibdev->ib_dev.dev));
 181                 } else {
 182                         usnic_info(" %s old mac: %pM new mac: %pM\n",
 183                                         dev_name(&us_ibdev->ib_dev.dev),
 184                                         us_ibdev->ufdev->mac,
 185                                         netdev->dev_addr);
 186                         usnic_fwd_set_mac(us_ibdev->ufdev, netdev->dev_addr);
 187                         usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 188                         ib_event.event = IB_EVENT_GID_CHANGE;
 189                         ib_event.device = &us_ibdev->ib_dev;
 190                         ib_event.element.port_num = 1;
 191                         ib_dispatch_event(&ib_event);
 192                 }
 193
 194                 break;
 195         case NETDEV_CHANGEMTU:
 196                 if (us_ibdev->ufdev->mtu != netdev->mtu) {
 197                         usnic_info("MTU Change on %s old: %u new: %u\n",
 198                                         dev_name(&us_ibdev->ib_dev.dev),
 199                                         us_ibdev->ufdev->mtu, netdev->mtu);
 200                         usnic_fwd_set_mtu(us_ibdev->ufdev, netdev->mtu);
 201                         usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 202                 } else {
 203                         usnic_dbg("Ignoring MTU change on %s\n",
 204                                   dev_name(&us_ibdev->ib_dev.dev));
 205                 }
 206                 break;
 207         default:
 208                 usnic_dbg("Ignoring event %s on %s",
 209                                 netdev_cmd_to_name(event),
 210                                 dev_name(&us_ibdev->ib_dev.dev));
 211         }
 212         mutex_unlock(&us_ibdev->usdev_lock);
 213 }
 214
 215 static int usnic_ib_netdevice_event(struct notifier_block *notifier,
 216                                         unsigned long event, void *ptr)
 217 {
 218         struct usnic_ib_dev *us_ibdev;
 219         struct ib_device *ibdev;
 220
 221         struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
 222
 223         ibdev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_USNIC);
 224         if (!ibdev)
 225                 return NOTIFY_DONE;
 226
 227         us_ibdev = container_of(ibdev, struct usnic_ib_dev, ib_dev);
 228         usnic_ib_handle_usdev_event(us_ibdev, event);
 229         ib_device_put(ibdev);
 230         return NOTIFY_DONE;
 231 }
 232
 233 static struct notifier_block usnic_ib_netdevice_notifier = {
 234         .notifier_call = usnic_ib_netdevice_event
 235 };
 236 /* End of netdev section */
 237
 238 /* Start of inet section */
 239 static int usnic_ib_handle_inet_event(struct usnic_ib_dev *us_ibdev,
 240                                         unsigned long event, void *ptr)
 241 {
 242         struct in_ifaddr *ifa = ptr;
 243         struct ib_event ib_event;
 244
 245         mutex_lock(&us_ibdev->usdev_lock);
 246
 247         switch (event) {
 248         case NETDEV_DOWN:
 249                 usnic_info("%s via ip notifiers",
 250                                 netdev_cmd_to_name(event));
 251                 usnic_fwd_del_ipaddr(us_ibdev->ufdev);
 252                 usnic_ib_qp_grp_modify_active_to_err(us_ibdev);
 253                 ib_event.event = IB_EVENT_GID_CHANGE;
 254                 ib_event.device = &us_ibdev->ib_dev;
 255                 ib_event.element.port_num = 1;
 256                 ib_dispatch_event(&ib_event);
 257                 break;
 258         case NETDEV_UP:
 259                 usnic_fwd_add_ipaddr(us_ibdev->ufdev, ifa->ifa_address);
 260                 usnic_info("%s via ip notifiers: ip %pI4",
 261                                 netdev_cmd_to_name(event),
 262                                 &us_ibdev->ufdev->inaddr);
 263                 ib_event.event = IB_EVENT_GID_CHANGE;
 264                 ib_event.device = &us_ibdev->ib_dev;
 265                 ib_event.element.port_num = 1;
 266                 ib_dispatch_event(&ib_event);
 267                 break;
 268         default:
 269                 usnic_info("Ignoring event %s on %s",
 270                                 netdev_cmd_to_name(event),
 271                                 dev_name(&us_ibdev->ib_dev.dev));
 272         }
 273         mutex_unlock(&us_ibdev->usdev_lock);
 274
 275         return NOTIFY_DONE;
 276 }
 277
 278 static int usnic_ib_inetaddr_event(struct notifier_block *notifier,
 279                                         unsigned long event, void *ptr)
 280 {
 281         struct usnic_ib_dev *us_ibdev;
 282         struct in_ifaddr *ifa = ptr;
 283         struct net_device *netdev = ifa->ifa_dev->dev;
 284         struct ib_device *ibdev;
 285
 286         ibdev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_USNIC);
 287         if (!ibdev)
 288                 return NOTIFY_DONE;
 289
 290         us_ibdev = container_of(ibdev, struct usnic_ib_dev, ib_dev);
 291         usnic_ib_handle_inet_event(us_ibdev, event, ptr);
 292         ib_device_put(ibdev);
 293         return NOTIFY_DONE;
 294 }
 295 static struct notifier_block usnic_ib_inetaddr_notifier = {
 296         .notifier_call = usnic_ib_inetaddr_event
 297 };
 298 /* End of inet section*/
 299
 300 static int usnic_port_immutable(struct ib_device *ibdev, u8 port_num,
 301                                 struct ib_port_immutable *immutable)
 302 {
 303         struct ib_port_attr attr;
 304         int err;
 305
 306         immutable->core_cap_flags = RDMA_CORE_PORT_USNIC;
 307
 308         err = ib_query_port(ibdev, port_num, &attr);
 309         if (err)
 310                 return err;
 311
 312         immutable->pkey_tbl_len = attr.pkey_tbl_len;
 313         immutable->gid_tbl_len = attr.gid_tbl_len;
 314
 315         return 0;
 316 }
 317
 318 static void usnic_get_dev_fw_str(struct ib_device *device, char *str)
 319 {
 320         struct usnic_ib_dev *us_ibdev =
 321                 container_of(device, struct usnic_ib_dev, ib_dev);
 322         struct ethtool_drvinfo info;
 323
 324         mutex_lock(&us_ibdev->usdev_lock);
 325         us_ibdev->netdev->ethtool_ops->get_drvinfo(us_ibdev->netdev, &info);
 326         mutex_unlock(&us_ibdev->usdev_lock);
 327
 328         snprintf(str, IB_FW_VERSION_NAME_MAX, "%s", info.fw_version);
 329 }
 330
 331 static const struct ib_device_ops usnic_dev_ops = {
 332         .alloc_pd = usnic_ib_alloc_pd,
 333         .alloc_ucontext = usnic_ib_alloc_ucontext,
 334         .create_cq = usnic_ib_create_cq,
 335         .create_qp = usnic_ib_create_qp,
 336         .dealloc_pd = usnic_ib_dealloc_pd,
 337         .dealloc_ucontext = usnic_ib_dealloc_ucontext,
 338         .dereg_mr = usnic_ib_dereg_mr,
 339         .destroy_cq = usnic_ib_destroy_cq,
 340         .destroy_qp = usnic_ib_destroy_qp,
 341         .get_dev_fw_str = usnic_get_dev_fw_str,
 342         .get_link_layer = usnic_ib_port_link_layer,
 343         .get_port_immutable = usnic_port_immutable,
 344         .mmap = usnic_ib_mmap,
 345         .modify_qp = usnic_ib_modify_qp,
 346         .query_device = usnic_ib_query_device,
 347         .query_gid = usnic_ib_query_gid,
 348         .query_pkey = usnic_ib_query_pkey,
 349         .query_port = usnic_ib_query_port,
 350         .query_qp = usnic_ib_query_qp,
 351         .reg_user_mr = usnic_ib_reg_mr,
 352         INIT_RDMA_OBJ_SIZE(ib_pd, usnic_ib_pd, ibpd),
 353         INIT_RDMA_OBJ_SIZE(ib_ucontext, usnic_ib_ucontext, ibucontext),
 354 };
 355
 356 /* Start of PF discovery section */
 357 static void *usnic_ib_device_add(struct pci_dev *dev)
 358 {
 359         struct usnic_ib_dev *us_ibdev;
 360         union ib_gid gid;
 361         struct in_device *ind;
 362         struct net_device *netdev;
 363         int ret;
 364
 365         usnic_dbg("\n");
 366         netdev = pci_get_drvdata(dev);
 367
 368         us_ibdev = ib_alloc_device(usnic_ib_dev, ib_dev);
 369         if (!us_ibdev) {
 370                 usnic_err("Device %s context alloc failed\n",
 371                                 netdev_name(pci_get_drvdata(dev)));
 372                 return ERR_PTR(-EFAULT);
 373         }
 374
 375         us_ibdev->ufdev = usnic_fwd_dev_alloc(dev);
 376         if (!us_ibdev->ufdev) {
 377                 usnic_err("Failed to alloc ufdev for %s\n", pci_name(dev));
 378                 goto err_dealloc;
 379         }
 380
 381         mutex_init(&us_ibdev->usdev_lock);
 382         INIT_LIST_HEAD(&us_ibdev->vf_dev_list);
 383         INIT_LIST_HEAD(&us_ibdev->ctx_list);
 384
 385         us_ibdev->pdev = dev;
 386         us_ibdev->netdev = pci_get_drvdata(dev);
 387         us_ibdev->ib_dev.owner = THIS_MODULE;
 388         us_ibdev->ib_dev.node_type = RDMA_NODE_USNIC_UDP;
 389         us_ibdev->ib_dev.phys_port_cnt = USNIC_IB_PORT_CNT;
 390         us_ibdev->ib_dev.num_comp_vectors = USNIC_IB_NUM_COMP_VECTORS;
 391         us_ibdev->ib_dev.dev.parent = &dev->dev;
 392         us_ibdev->ib_dev.uverbs_abi_ver = USNIC_UVERBS_ABI_VERSION;
 393
 394         us_ibdev->ib_dev.uverbs_cmd_mask =
 395                 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
 396                 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
 397                 (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
 398                 (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
 399                 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
 400                 (1ull << IB_USER_VERBS_CMD_REG_MR) |
 401                 (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
 402                 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
 403                 (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
 404                 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
 405                 (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
 406                 (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
 407                 (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
 408                 (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
 409                 (1ull << IB_USER_VERBS_CMD_ATTACH_MCAST) |
 410                 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST) |
 411                 (1ull << IB_USER_VERBS_CMD_OPEN_QP);
 412
 413         ib_set_device_ops(&us_ibdev->ib_dev, &usnic_dev_ops);
 414
 415         us_ibdev->ib_dev.driver_id = RDMA_DRIVER_USNIC;
 416         rdma_set_device_sysfs_group(&us_ibdev->ib_dev, &usnic_attr_group);
 417
 418         ret = ib_device_set_netdev(&us_ibdev->ib_dev, us_ibdev->netdev, 1);
 419         if (ret)
 420                 goto err_fwd_dealloc;
 421
 422         if (ib_register_device(&us_ibdev->ib_dev, "usnic_%d"))
 423                 goto err_fwd_dealloc;
 424
 425         usnic_fwd_set_mtu(us_ibdev->ufdev, us_ibdev->netdev->mtu);
 426         usnic_fwd_set_mac(us_ibdev->ufdev, us_ibdev->netdev->dev_addr);
 427         if (netif_carrier_ok(us_ibdev->netdev))
 428                 usnic_fwd_carrier_up(us_ibdev->ufdev);
 429
 430         rcu_read_lock();
 431         ind = __in_dev_get_rcu(netdev);
 432         if (ind) {
 433                 const struct in_ifaddr *ifa;
 434
 435                 ifa = rcu_dereference(ind->ifa_list);
 436                 if (ifa)
 437                         usnic_fwd_add_ipaddr(us_ibdev->ufdev, ifa->ifa_address);
 438         }
 439         rcu_read_unlock();
 440
 441         usnic_mac_ip_to_gid(us_ibdev->netdev->perm_addr,
 442                                 us_ibdev->ufdev->inaddr, &gid.raw[0]);
 443         memcpy(&us_ibdev->ib_dev.node_guid, &gid.global.interface_id,
 444                 sizeof(gid.global.interface_id));
 445         kref_init(&us_ibdev->vf_cnt);
 446
 447         usnic_info("Added ibdev: %s netdev: %s with mac %pM Link: %u MTU: %u\n",
 448                    dev_name(&us_ibdev->ib_dev.dev),
 449                    netdev_name(us_ibdev->netdev), us_ibdev->ufdev->mac,
 450                    us_ibdev->ufdev->link_up, us_ibdev->ufdev->mtu);
 451         return us_ibdev;
 452
 453 err_fwd_dealloc:
 454         usnic_fwd_dev_free(us_ibdev->ufdev);
 455 err_dealloc:
 456         usnic_err("failed -- deallocing device\n");
 457         ib_dealloc_device(&us_ibdev->ib_dev);
 458         return NULL;
 459 }
 460
 461 static void usnic_ib_device_remove(struct usnic_ib_dev *us_ibdev)
 462 {
 463         usnic_info("Unregistering %s\n", dev_name(&us_ibdev->ib_dev.dev));
 464         usnic_ib_sysfs_unregister_usdev(us_ibdev);
 465         usnic_fwd_dev_free(us_ibdev->ufdev);
 466         ib_unregister_device(&us_ibdev->ib_dev);
 467         ib_dealloc_device(&us_ibdev->ib_dev);
 468 }
 469
 470 static void usnic_ib_undiscover_pf(struct kref *kref)
 471 {
 472         struct usnic_ib_dev *us_ibdev, *tmp;
 473         struct pci_dev *dev;
 474         bool found = false;
 475
 476         dev = container_of(kref, struct usnic_ib_dev, vf_cnt)->pdev;
 477         mutex_lock(&usnic_ib_ibdev_list_lock);
 478         list_for_each_entry_safe(us_ibdev, tmp,
 479                                 &usnic_ib_ibdev_list, ib_dev_link) {
 480                 if (us_ibdev->pdev == dev) {
 481                         list_del(&us_ibdev->ib_dev_link);
 482                         found = true;
 483                         break;
 484                 }
 485         }
 486
 487
 488         mutex_unlock(&usnic_ib_ibdev_list_lock);
 489         if (found)
 490                 usnic_ib_device_remove(us_ibdev);
 491         else
 492                 WARN(1, "Failed to remove PF %s\n", pci_name(dev));
 493 }
 494
 495 static struct usnic_ib_dev *usnic_ib_discover_pf(struct usnic_vnic *vnic)
 496 {
 497         struct usnic_ib_dev *us_ibdev;
 498         struct pci_dev *parent_pci, *vf_pci;
 499         int err;
 500
 501         vf_pci = usnic_vnic_get_pdev(vnic);
 502         parent_pci = pci_physfn(vf_pci);
 503
 504         BUG_ON(!parent_pci);
 505
 506         mutex_lock(&usnic_ib_ibdev_list_lock);
 507         list_for_each_entry(us_ibdev, &usnic_ib_ibdev_list, ib_dev_link) {
 508                 if (us_ibdev->pdev == parent_pci) {
 509                         kref_get(&us_ibdev->vf_cnt);
 510                         goto out;
 511                 }
 512         }
 513
 514         us_ibdev = usnic_ib_device_add(parent_pci);
 515         if (IS_ERR_OR_NULL(us_ibdev)) {
 516                 us_ibdev = us_ibdev ? us_ibdev : ERR_PTR(-EFAULT);
 517                 goto out;
 518         }
 519
 520         err = usnic_ib_sysfs_register_usdev(us_ibdev);
 521         if (err) {
 522                 usnic_ib_device_remove(us_ibdev);
 523                 us_ibdev = ERR_PTR(err);
 524                 goto out;
 525         }
 526
 527         list_add(&us_ibdev->ib_dev_link, &usnic_ib_ibdev_list);
 528 out:
 529         mutex_unlock(&usnic_ib_ibdev_list_lock);
 530         return us_ibdev;
 531 }
 532 /* End of PF discovery section */
 533
 534 /* Start of PCI section */
 535
 536 static const struct pci_device_id usnic_ib_pci_ids[] = {
 537         {PCI_DEVICE(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_CISCO_VIC_USPACE_NIC)},
 538         {0,}
 539 };
 540
 541 static int usnic_ib_pci_probe(struct pci_dev *pdev,
 542                                 const struct pci_device_id *id)
 543 {
 544         int err;
 545         struct usnic_ib_dev *pf;
 546         struct usnic_ib_vf *vf;
 547         enum usnic_vnic_res_type res_type;
 548
 549         vf = kzalloc(sizeof(*vf), GFP_KERNEL);
 550         if (!vf)
 551                 return -ENOMEM;
 552
 553         err = pci_enable_device(pdev);
 554         if (err) {
 555                 usnic_err("Failed to enable %s with err %d\n",
 556                                 pci_name(pdev), err);
 557                 goto out_clean_vf;
 558         }
 559
 560         err = pci_request_regions(pdev, DRV_NAME);
 561         if (err) {
 562                 usnic_err("Failed to request region for %s with err %d\n",
 563                                 pci_name(pdev), err);
 564                 goto out_disable_device;
 565         }
 566
 567         pci_set_master(pdev);
 568         pci_set_drvdata(pdev, vf);
 569
 570         vf->vnic = usnic_vnic_alloc(pdev);
 571         if (IS_ERR_OR_NULL(vf->vnic)) {
 572                 err = vf->vnic ? PTR_ERR(vf->vnic) : -ENOMEM;
 573                 usnic_err("Failed to alloc vnic for %s with err %d\n",
 574                                 pci_name(pdev), err);
 575                 goto out_release_regions;
 576         }
 577
 578         pf = usnic_ib_discover_pf(vf->vnic);
 579         if (IS_ERR_OR_NULL(pf)) {
 580                 usnic_err("Failed to discover pf of vnic %s with err%ld\n",
 581                                 pci_name(pdev), PTR_ERR(pf));
 582                 err = pf ? PTR_ERR(pf) : -EFAULT;
 583                 goto out_clean_vnic;
 584         }
 585
 586         vf->pf = pf;
 587         spin_lock_init(&vf->lock);
 588         mutex_lock(&pf->usdev_lock);
 589         list_add_tail(&vf->link, &pf->vf_dev_list);
 590         /*
 591          * Save max settings (will be same for each VF, easier to re-write than
 592          * to say "if (!set) { set_values(); set=1; }
 593          */
 594         for (res_type = USNIC_VNIC_RES_TYPE_EOL+1;
 595                         res_type < USNIC_VNIC_RES_TYPE_MAX;
 596                         res_type++) {
 597                 pf->vf_res_cnt[res_type] = usnic_vnic_res_cnt(vf->vnic,
 598                                                                 res_type);
 599         }
 600
 601         mutex_unlock(&pf->usdev_lock);
 602
 603         usnic_info("Registering usnic VF %s into PF %s\n", pci_name(pdev),
 604                    dev_name(&pf->ib_dev.dev));
 605         usnic_ib_log_vf(vf);
 606         return 0;
 607
 608 out_clean_vnic:
 609         usnic_vnic_free(vf->vnic);
 610 out_release_regions:
 611         pci_set_drvdata(pdev, NULL);
 612         pci_clear_master(pdev);
 613         pci_release_regions(pdev);
 614 out_disable_device:
 615         pci_disable_device(pdev);
 616 out_clean_vf:
 617         kfree(vf);
 618         return err;
 619 }
 620
 621 static void usnic_ib_pci_remove(struct pci_dev *pdev)
 622 {
 623         struct usnic_ib_vf *vf = pci_get_drvdata(pdev);
 624         struct usnic_ib_dev *pf = vf->pf;
 625
 626         mutex_lock(&pf->usdev_lock);
 627         list_del(&vf->link);
 628         mutex_unlock(&pf->usdev_lock);
 629
 630         kref_put(&pf->vf_cnt, usnic_ib_undiscover_pf);
 631         usnic_vnic_free(vf->vnic);
 632         pci_set_drvdata(pdev, NULL);
 633         pci_clear_master(pdev);
 634         pci_release_regions(pdev);
 635         pci_disable_device(pdev);
 636         kfree(vf);
 637
 638         usnic_info("Removed VF %s\n", pci_name(pdev));
 639 }
 640
 641 /* PCI driver entry points */
 642 static struct pci_driver usnic_ib_pci_driver = {
 643         .name = DRV_NAME,
 644         .id_table = usnic_ib_pci_ids,
 645         .probe = usnic_ib_pci_probe,
 646         .remove = usnic_ib_pci_remove,
 647 };
 648 /* End of PCI section */
 649
 650 /* Start of module section */
 651 static int __init usnic_ib_init(void)
 652 {
 653         int err;
 654
 655         printk_once(KERN_INFO "%s", usnic_version);
 656
 657         err = usnic_uiom_init(DRV_NAME);
 658         if (err) {
 659                 usnic_err("Unable to initialize umem with err %d\n", err);
 660                 return err;
 661         }
 662
 663         err = pci_register_driver(&usnic_ib_pci_driver);
 664         if (err) {
 665                 usnic_err("Unable to register with PCI\n");
 666                 goto out_umem_fini;
 667         }
 668
 669         err = register_netdevice_notifier(&usnic_ib_netdevice_notifier);
 670         if (err) {
 671                 usnic_err("Failed to register netdev notifier\n");
 672                 goto out_pci_unreg;
 673         }
 674
 675         err = register_inetaddr_notifier(&usnic_ib_inetaddr_notifier);
 676         if (err) {
 677                 usnic_err("Failed to register inet addr notifier\n");
 678                 goto out_unreg_netdev_notifier;
 679         }
 680
 681         err = usnic_transport_init();
 682         if (err) {
 683                 usnic_err("Failed to initialize transport\n");
 684                 goto out_unreg_inetaddr_notifier;
 685         }
 686
 687         usnic_debugfs_init();
 688
 689         return 0;
 690
 691 out_unreg_inetaddr_notifier:
 692         unregister_inetaddr_notifier(&usnic_ib_inetaddr_notifier);
 693 out_unreg_netdev_notifier:
 694         unregister_netdevice_notifier(&usnic_ib_netdevice_notifier);
 695 out_pci_unreg:
 696         pci_unregister_driver(&usnic_ib_pci_driver);
 697 out_umem_fini:
 698
 699         return err;
 700 }
 701
 702 static void __exit usnic_ib_destroy(void)
 703 {
 704         usnic_dbg("\n");
 705         usnic_debugfs_exit();
 706         usnic_transport_fini();
 707         unregister_inetaddr_notifier(&usnic_ib_inetaddr_notifier);
 708         unregister_netdevice_notifier(&usnic_ib_netdevice_notifier);
 709         pci_unregister_driver(&usnic_ib_pci_driver);
 710 }
 711
 712 MODULE_DESCRIPTION("Cisco VIC (usNIC) Verbs Driver");
 713 MODULE_AUTHOR("Upinder Malhi <umalhi@cisco.com>");
 714 MODULE_LICENSE("Dual BSD/GPL");
 715 module_param(usnic_log_lvl, uint, S_IRUGO | S_IWUSR);
 716 module_param(usnic_ib_share_vf, uint, S_IRUGO | S_IWUSR);
 717 MODULE_PARM_DESC(usnic_log_lvl, " Off=0, Err=1, Info=2, Debug=3");
 718 MODULE_PARM_DESC(usnic_ib_share_vf, "Off=0, On=1 VF sharing amongst QPs");
 719 MODULE_DEVICE_TABLE(pci, usnic_ib_pci_ids);
 720
 721 module_init(usnic_ib_init);
 722 module_exit(usnic_ib_destroy);
 723 /* End of module section */