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         immutable->core_cap_flags = RDMA_CORE_PORT_USNIC;
 325
 326         err = ib_query_port(ibdev, port_num, &attr);
 327         if (err)
 328                 return err;
 329
 330         immutable->pkey_tbl_len = attr.pkey_tbl_len;
 331         immutable->gid_tbl_len = attr.gid_tbl_len;
 332
 333         return 0;
 334 }
 335
 336 static void usnic_get_dev_fw_str(struct ib_device *device, char *str)
 337 {
 338         struct usnic_ib_dev *us_ibdev =
 339                 container_of(device, struct usnic_ib_dev, ib_dev);
 340         struct ethtool_drvinfo info;
 341
 342         mutex_lock(&us_ibdev->usdev_lock);
 343         us_ibdev->netdev->ethtool_ops->get_drvinfo(us_ibdev->netdev, &info);
 344         mutex_unlock(&us_ibdev->usdev_lock);
 345
 346         snprintf(str, IB_FW_VERSION_NAME_MAX, "%s", info.fw_version);
 347 }
 348
 349 /* Start of PF discovery section */
 350 static void *usnic_ib_device_add(struct pci_dev *dev)
 351 {
 352         struct usnic_ib_dev *us_ibdev;
 353         union ib_gid gid;
 354         struct in_device *ind;
 355         struct net_device *netdev;
 356
 357         usnic_dbg("\n");
 358         netdev = pci_get_drvdata(dev);
 359
 360         us_ibdev = (struct usnic_ib_dev *)ib_alloc_device(sizeof(*us_ibdev));
 361         if (!us_ibdev) {
 362                 usnic_err("Device %s context alloc failed\n",
 363                                 netdev_name(pci_get_drvdata(dev)));
 364                 return ERR_PTR(-EFAULT);
 365         }
 366
 367         us_ibdev->ufdev = usnic_fwd_dev_alloc(dev);
 368         if (!us_ibdev->ufdev) {
 369                 usnic_err("Failed to alloc ufdev for %s\n", pci_name(dev));
 370                 goto err_dealloc;
 371         }
 372
 373         mutex_init(&us_ibdev->usdev_lock);
 374         INIT_LIST_HEAD(&us_ibdev->vf_dev_list);
 375         INIT_LIST_HEAD(&us_ibdev->ctx_list);
 376
 377         us_ibdev->pdev = dev;
 378         us_ibdev->netdev = pci_get_drvdata(dev);
 379         us_ibdev->ib_dev.owner = THIS_MODULE;
 380         us_ibdev->ib_dev.node_type = RDMA_NODE_USNIC_UDP;
 381         us_ibdev->ib_dev.phys_port_cnt = USNIC_IB_PORT_CNT;
 382         us_ibdev->ib_dev.num_comp_vectors = USNIC_IB_NUM_COMP_VECTORS;
 383         us_ibdev->ib_dev.dev.parent = &dev->dev;
 384         us_ibdev->ib_dev.uverbs_abi_ver = USNIC_UVERBS_ABI_VERSION;
 385         strlcpy(us_ibdev->ib_dev.name, "usnic_%d", IB_DEVICE_NAME_MAX);
 386
 387         us_ibdev->ib_dev.uverbs_cmd_mask =
 388                 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
 389                 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
 390                 (1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
 391                 (1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
 392                 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
 393                 (1ull << IB_USER_VERBS_CMD_REG_MR) |
 394                 (1ull << IB_USER_VERBS_CMD_DEREG_MR) |
 395                 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
 396                 (1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
 397                 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
 398                 (1ull << IB_USER_VERBS_CMD_CREATE_QP) |
 399                 (1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
 400                 (1ull << IB_USER_VERBS_CMD_QUERY_QP) |
 401                 (1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
 402                 (1ull << IB_USER_VERBS_CMD_ATTACH_MCAST) |
 403                 (1ull << IB_USER_VERBS_CMD_DETACH_MCAST) |
 404                 (1ull << IB_USER_VERBS_CMD_OPEN_QP);
 405
 406         us_ibdev->ib_dev.query_device = usnic_ib_query_device;
 407         us_ibdev->ib_dev.query_port = usnic_ib_query_port;
 408         us_ibdev->ib_dev.query_pkey = usnic_ib_query_pkey;
 409         us_ibdev->ib_dev.query_gid = usnic_ib_query_gid;
 410         us_ibdev->ib_dev.get_netdev = usnic_get_netdev;
 411         us_ibdev->ib_dev.get_link_layer = usnic_ib_port_link_layer;
 412         us_ibdev->ib_dev.alloc_pd = usnic_ib_alloc_pd;
 413         us_ibdev->ib_dev.dealloc_pd = usnic_ib_dealloc_pd;
 414         us_ibdev->ib_dev.create_qp = usnic_ib_create_qp;
 415         us_ibdev->ib_dev.modify_qp = usnic_ib_modify_qp;
 416         us_ibdev->ib_dev.query_qp = usnic_ib_query_qp;
 417         us_ibdev->ib_dev.destroy_qp = usnic_ib_destroy_qp;
 418         us_ibdev->ib_dev.create_cq = usnic_ib_create_cq;
 419         us_ibdev->ib_dev.destroy_cq = usnic_ib_destroy_cq;
 420         us_ibdev->ib_dev.reg_user_mr = usnic_ib_reg_mr;
 421         us_ibdev->ib_dev.dereg_mr = usnic_ib_dereg_mr;
 422         us_ibdev->ib_dev.alloc_ucontext = usnic_ib_alloc_ucontext;
 423         us_ibdev->ib_dev.dealloc_ucontext = usnic_ib_dealloc_ucontext;
 424         us_ibdev->ib_dev.mmap = usnic_ib_mmap;
 425         us_ibdev->ib_dev.create_ah = usnic_ib_create_ah;
 426         us_ibdev->ib_dev.destroy_ah = usnic_ib_destroy_ah;
 427         us_ibdev->ib_dev.post_send = usnic_ib_post_send;
 428         us_ibdev->ib_dev.post_recv = usnic_ib_post_recv;
 429         us_ibdev->ib_dev.poll_cq = usnic_ib_poll_cq;
 430         us_ibdev->ib_dev.req_notify_cq = usnic_ib_req_notify_cq;
 431         us_ibdev->ib_dev.get_dma_mr = usnic_ib_get_dma_mr;
 432         us_ibdev->ib_dev.get_port_immutable = usnic_port_immutable;
 433         us_ibdev->ib_dev.get_dev_fw_str     = usnic_get_dev_fw_str;
 434
 435
 436         if (ib_register_device(&us_ibdev->ib_dev, NULL))
 437                 goto err_fwd_dealloc;
 438
 439         usnic_fwd_set_mtu(us_ibdev->ufdev, us_ibdev->netdev->mtu);
 440         usnic_fwd_set_mac(us_ibdev->ufdev, us_ibdev->netdev->dev_addr);
 441         if (netif_carrier_ok(us_ibdev->netdev))
 442                 usnic_fwd_carrier_up(us_ibdev->ufdev);
 443
 444         ind = in_dev_get(netdev);
 445         if (ind->ifa_list)
 446                 usnic_fwd_add_ipaddr(us_ibdev->ufdev,
 447                                      ind->ifa_list->ifa_address);
 448         in_dev_put(ind);
 449
 450         usnic_mac_ip_to_gid(us_ibdev->netdev->perm_addr,
 451                                 us_ibdev->ufdev->inaddr, &gid.raw[0]);
 452         memcpy(&us_ibdev->ib_dev.node_guid, &gid.global.interface_id,
 453                 sizeof(gid.global.interface_id));
 454         kref_init(&us_ibdev->vf_cnt);
 455
 456         usnic_info("Added ibdev: %s netdev: %s with mac %pM Link: %u MTU: %u\n",
 457                         us_ibdev->ib_dev.name, netdev_name(us_ibdev->netdev),
 458                         us_ibdev->ufdev->mac, us_ibdev->ufdev->link_up,
 459                         us_ibdev->ufdev->mtu);
 460         return us_ibdev;
 461
 462 err_fwd_dealloc:
 463         usnic_fwd_dev_free(us_ibdev->ufdev);
 464 err_dealloc:
 465         usnic_err("failed -- deallocing device\n");
 466         ib_dealloc_device(&us_ibdev->ib_dev);
 467         return NULL;
 468 }
 469
 470 static void usnic_ib_device_remove(struct usnic_ib_dev *us_ibdev)
 471 {
 472         usnic_info("Unregistering %s\n", us_ibdev->ib_dev.name);
 473         usnic_ib_sysfs_unregister_usdev(us_ibdev);
 474         usnic_fwd_dev_free(us_ibdev->ufdev);
 475         ib_unregister_device(&us_ibdev->ib_dev);
 476         ib_dealloc_device(&us_ibdev->ib_dev);
 477 }
 478
 479 static void usnic_ib_undiscover_pf(struct kref *kref)
 480 {
 481         struct usnic_ib_dev *us_ibdev, *tmp;
 482         struct pci_dev *dev;
 483         bool found = false;
 484
 485         dev = container_of(kref, struct usnic_ib_dev, vf_cnt)->pdev;
 486         mutex_lock(&usnic_ib_ibdev_list_lock);
 487         list_for_each_entry_safe(us_ibdev, tmp,
 488                                 &usnic_ib_ibdev_list, ib_dev_link) {
 489                 if (us_ibdev->pdev == dev) {
 490                         list_del(&us_ibdev->ib_dev_link);
 491                         usnic_ib_device_remove(us_ibdev);
 492                         found = true;
 493                         break;
 494                 }
 495         }
 496
 497         WARN(!found, "Failed to remove PF %s\n", pci_name(dev));
 498
 499         mutex_unlock(&usnic_ib_ibdev_list_lock);
 500 }
 501
 502 static struct usnic_ib_dev *usnic_ib_discover_pf(struct usnic_vnic *vnic)
 503 {
 504         struct usnic_ib_dev *us_ibdev;
 505         struct pci_dev *parent_pci, *vf_pci;
 506         int err;
 507
 508         vf_pci = usnic_vnic_get_pdev(vnic);
 509         parent_pci = pci_physfn(vf_pci);
 510
 511         BUG_ON(!parent_pci);
 512
 513         mutex_lock(&usnic_ib_ibdev_list_lock);
 514         list_for_each_entry(us_ibdev, &usnic_ib_ibdev_list, ib_dev_link) {
 515                 if (us_ibdev->pdev == parent_pci) {
 516                         kref_get(&us_ibdev->vf_cnt);
 517                         goto out;
 518                 }
 519         }
 520
 521         us_ibdev = usnic_ib_device_add(parent_pci);
 522         if (IS_ERR_OR_NULL(us_ibdev)) {
 523                 us_ibdev = us_ibdev ? us_ibdev : ERR_PTR(-EFAULT);
 524                 goto out;
 525         }
 526
 527         err = usnic_ib_sysfs_register_usdev(us_ibdev);
 528         if (err) {
 529                 usnic_ib_device_remove(us_ibdev);
 530                 us_ibdev = ERR_PTR(err);
 531                 goto out;
 532         }
 533
 534         list_add(&us_ibdev->ib_dev_link, &usnic_ib_ibdev_list);
 535 out:
 536         mutex_unlock(&usnic_ib_ibdev_list_lock);
 537         return us_ibdev;
 538 }
 539 /* End of PF discovery section */
 540
 541 /* Start of PCI section */
 542
 543 static const struct pci_device_id usnic_ib_pci_ids[] = {
 544         {PCI_DEVICE(PCI_VENDOR_ID_CISCO, PCI_DEVICE_ID_CISCO_VIC_USPACE_NIC)},
 545         {0,}
 546 };
 547
 548 static int usnic_ib_pci_probe(struct pci_dev *pdev,
 549                                 const struct pci_device_id *id)
 550 {
 551         int err;
 552         struct usnic_ib_dev *pf;
 553         struct usnic_ib_vf *vf;
 554         enum usnic_vnic_res_type res_type;
 555
 556         vf = kzalloc(sizeof(*vf), GFP_KERNEL);
 557         if (!vf)
 558                 return -ENOMEM;
 559
 560         err = pci_enable_device(pdev);
 561         if (err) {
 562                 usnic_err("Failed to enable %s with err %d\n",
 563                                 pci_name(pdev), err);
 564                 goto out_clean_vf;
 565         }
 566
 567         err = pci_request_regions(pdev, DRV_NAME);
 568         if (err) {
 569                 usnic_err("Failed to request region for %s with err %d\n",
 570                                 pci_name(pdev), err);
 571                 goto out_disable_device;
 572         }
 573
 574         pci_set_master(pdev);
 575         pci_set_drvdata(pdev, vf);
 576
 577         vf->vnic = usnic_vnic_alloc(pdev);
 578         if (IS_ERR_OR_NULL(vf->vnic)) {
 579                 err = vf->vnic ? PTR_ERR(vf->vnic) : -ENOMEM;
 580                 usnic_err("Failed to alloc vnic for %s with err %d\n",
 581                                 pci_name(pdev), err);
 582                 goto out_release_regions;
 583         }
 584
 585         pf = usnic_ib_discover_pf(vf->vnic);
 586         if (IS_ERR_OR_NULL(pf)) {
 587                 usnic_err("Failed to discover pf of vnic %s with err%ld\n",
 588                                 pci_name(pdev), PTR_ERR(pf));
 589                 err = pf ? PTR_ERR(pf) : -EFAULT;
 590                 goto out_clean_vnic;
 591         }
 592
 593         vf->pf = pf;
 594         spin_lock_init(&vf->lock);
 595         mutex_lock(&pf->usdev_lock);
 596         list_add_tail(&vf->link, &pf->vf_dev_list);
 597         /*
 598          * Save max settings (will be same for each VF, easier to re-write than
 599          * to say "if (!set) { set_values(); set=1; }
 600          */
 601         for (res_type = USNIC_VNIC_RES_TYPE_EOL+1;
 602                         res_type < USNIC_VNIC_RES_TYPE_MAX;
 603                         res_type++) {
 604                 pf->vf_res_cnt[res_type] = usnic_vnic_res_cnt(vf->vnic,
 605                                                                 res_type);
 606         }
 607
 608         mutex_unlock(&pf->usdev_lock);
 609
 610         usnic_info("Registering usnic VF %s into PF %s\n", pci_name(pdev),
 611                         pf->ib_dev.name);
 612         usnic_ib_log_vf(vf);
 613         return 0;
 614
 615 out_clean_vnic:
 616         usnic_vnic_free(vf->vnic);
 617 out_release_regions:
 618         pci_set_drvdata(pdev, NULL);
 619         pci_clear_master(pdev);
 620         pci_release_regions(pdev);
 621 out_disable_device:
 622         pci_disable_device(pdev);
 623 out_clean_vf:
 624         kfree(vf);
 625         return err;
 626 }
 627
 628 static void usnic_ib_pci_remove(struct pci_dev *pdev)
 629 {
 630         struct usnic_ib_vf *vf = pci_get_drvdata(pdev);
 631         struct usnic_ib_dev *pf = vf->pf;
 632
 633         mutex_lock(&pf->usdev_lock);
 634         list_del(&vf->link);
 635         mutex_unlock(&pf->usdev_lock);
 636
 637         kref_put(&pf->vf_cnt, usnic_ib_undiscover_pf);
 638         usnic_vnic_free(vf->vnic);
 639         pci_set_drvdata(pdev, NULL);
 640         pci_clear_master(pdev);
 641         pci_release_regions(pdev);
 642         pci_disable_device(pdev);
 643         kfree(vf);
 644
 645         usnic_info("Removed VF %s\n", pci_name(pdev));
 646 }
 647
 648 /* PCI driver entry points */
 649 static struct pci_driver usnic_ib_pci_driver = {
 650         .name = DRV_NAME,
 651         .id_table = usnic_ib_pci_ids,
 652         .probe = usnic_ib_pci_probe,
 653         .remove = usnic_ib_pci_remove,
 654 };
 655 /* End of PCI section */
 656
 657 /* Start of module section */
 658 static int __init usnic_ib_init(void)
 659 {
 660         int err;
 661
 662         printk_once(KERN_INFO "%s", usnic_version);
 663
 664         err = usnic_uiom_init(DRV_NAME);
 665         if (err) {
 666                 usnic_err("Unable to initalize umem with err %d\n", err);
 667                 return err;
 668         }
 669
 670         err = pci_register_driver(&usnic_ib_pci_driver);
 671         if (err) {
 672                 usnic_err("Unable to register with PCI\n");
 673                 goto out_umem_fini;
 674         }
 675
 676         err = register_netdevice_notifier(&usnic_ib_netdevice_notifier);
 677         if (err) {
 678                 usnic_err("Failed to register netdev notifier\n");
 679                 goto out_pci_unreg;
 680         }
 681
 682         err = register_inetaddr_notifier(&usnic_ib_inetaddr_notifier);
 683         if (err) {
 684                 usnic_err("Failed to register inet addr notifier\n");
 685                 goto out_unreg_netdev_notifier;
 686         }
 687
 688         err = usnic_transport_init();
 689         if (err) {
 690                 usnic_err("Failed to initialize transport\n");
 691                 goto out_unreg_inetaddr_notifier;
 692         }
 693
 694         usnic_debugfs_init();
 695
 696         return 0;
 697
 698 out_unreg_inetaddr_notifier:
 699         unregister_inetaddr_notifier(&usnic_ib_inetaddr_notifier);
 700 out_unreg_netdev_notifier:
 701         unregister_netdevice_notifier(&usnic_ib_netdevice_notifier);
 702 out_pci_unreg:
 703         pci_unregister_driver(&usnic_ib_pci_driver);
 704 out_umem_fini:
 705         usnic_uiom_fini();
 706
 707         return err;
 708 }
 709
 710 static void __exit usnic_ib_destroy(void)
 711 {
 712         usnic_dbg("\n");
 713         usnic_debugfs_exit();
 714         usnic_transport_fini();
 715         unregister_inetaddr_notifier(&usnic_ib_inetaddr_notifier);
 716         unregister_netdevice_notifier(&usnic_ib_netdevice_notifier);
 717         pci_unregister_driver(&usnic_ib_pci_driver);
 718         usnic_uiom_fini();
 719 }
 720
 721 MODULE_DESCRIPTION("Cisco VIC (usNIC) Verbs Driver");
 722 MODULE_AUTHOR("Upinder Malhi <umalhi@cisco.com>");
 723 MODULE_LICENSE("Dual BSD/GPL");
 724 module_param(usnic_log_lvl, uint, S_IRUGO | S_IWUSR);
 725 module_param(usnic_ib_share_vf, uint, S_IRUGO | S_IWUSR);
 726 MODULE_PARM_DESC(usnic_log_lvl, " Off=0, Err=1, Info=2, Debug=3");
 727 MODULE_PARM_DESC(usnic_ib_share_vf, "Off=0, On=1 VF sharing amongst QPs");
 728 MODULE_DEVICE_TABLE(pci, usnic_ib_pci_ids);
 729
 730 module_init(usnic_ib_init);
 731 module_exit(usnic_ib_destroy);
 732 /* End of module section */