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