drivers/infiniband/hw/vmw_pvrdma/pvrdma_main.c

   1 /*
   2  * Copyright (c) 2012-2016 VMware, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of EITHER the GNU General Public License
   6  * version 2 as published by the Free Software Foundation or the BSD
   7  * 2-Clause License. This program is distributed in the hope that it
   8  * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
   9  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  10  * See the GNU General Public License version 2 for more details at
  11  * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program available in the file COPYING in the main
  15  * directory of this source tree.
  16  *
  17  * The BSD 2-Clause License
  18  *
  19  *     Redistribution and use in source and binary forms, with or
  20  *     without modification, are permitted provided that the following
  21  *     conditions are met:
  22  *
  23  *      - Redistributions of source code must retain the above
  24  *        copyright notice, this list of conditions and the following
  25  *        disclaimer.
  26  *
  27  *      - Redistributions in binary form must reproduce the above
  28  *        copyright notice, this list of conditions and the following
  29  *        disclaimer in the documentation and/or other materials
  30  *        provided with the distribution.
  31  *
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  35  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  36  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  37  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  38  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  39  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  41  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  42  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  43  * OF THE POSSIBILITY OF SUCH DAMAGE.
  44  */
  45
  46 #include <linux/errno.h>
  47 #include <linux/inetdevice.h>
  48 #include <linux/init.h>
  49 #include <linux/module.h>
  50 #include <linux/slab.h>
  51 #include <rdma/ib_addr.h>
  52 #include <rdma/ib_smi.h>
  53 #include <rdma/ib_user_verbs.h>
  54 #include <net/addrconf.h>
  55
  56 #include "pvrdma.h"
  57
  58 #define DRV_NAME        "vmw_pvrdma"
  59 #define DRV_VERSION     "1.0.1.0-k"
  60
  61 static DEFINE_MUTEX(pvrdma_device_list_lock);
  62 static LIST_HEAD(pvrdma_device_list);
  63 static struct workqueue_struct *event_wq;
  64
  65 static int pvrdma_add_gid(struct ib_device *ibdev,
  66                           u8 port_num,
  67                           unsigned int index,
  68                           const union ib_gid *gid,
  69                           const struct ib_gid_attr *attr,
  70                           void **context);
  71 static int pvrdma_del_gid(struct ib_device *ibdev,
  72                           u8 port_num,
  73                           unsigned int index,
  74                           void **context);
  75
  76
  77 static ssize_t show_hca(struct device *device, struct device_attribute *attr,
  78                         char *buf)
  79 {
  80         return sprintf(buf, "VMW_PVRDMA-%s\n", DRV_VERSION);
  81 }
  82
  83 static ssize_t show_rev(struct device *device, struct device_attribute *attr,
  84                         char *buf)
  85 {
  86         return sprintf(buf, "%d\n", PVRDMA_REV_ID);
  87 }
  88
  89 static ssize_t show_board(struct device *device, struct device_attribute *attr,
  90                           char *buf)
  91 {
  92         return sprintf(buf, "%d\n", PVRDMA_BOARD_ID);
  93 }
  94
  95 static DEVICE_ATTR(hw_rev,   S_IRUGO, show_rev,    NULL);
  96 static DEVICE_ATTR(hca_type, S_IRUGO, show_hca,    NULL);
  97 static DEVICE_ATTR(board_id, S_IRUGO, show_board,  NULL);
  98
  99 static struct device_attribute *pvrdma_class_attributes[] = {
 100         &dev_attr_hw_rev,
 101         &dev_attr_hca_type,
 102         &dev_attr_board_id
 103 };
 104
 105 static void pvrdma_get_fw_ver_str(struct ib_device *device, char *str)
 106 {
 107         struct pvrdma_dev *dev =
 108                 container_of(device, struct pvrdma_dev, ib_dev);
 109         snprintf(str, IB_FW_VERSION_NAME_MAX, "%d.%d.%d\n",
 110                  (int) (dev->dsr->caps.fw_ver >> 32),
 111                  (int) (dev->dsr->caps.fw_ver >> 16) & 0xffff,
 112                  (int) dev->dsr->caps.fw_ver & 0xffff);
 113 }
 114
 115 static int pvrdma_init_device(struct pvrdma_dev *dev)
 116 {
 117         /*  Initialize some device related stuff */
 118         spin_lock_init(&dev->cmd_lock);
 119         sema_init(&dev->cmd_sema, 1);
 120         atomic_set(&dev->num_qps, 0);
 121         atomic_set(&dev->num_cqs, 0);
 122         atomic_set(&dev->num_pds, 0);
 123         atomic_set(&dev->num_ahs, 0);
 124
 125         return 0;
 126 }
 127
 128 static int pvrdma_port_immutable(struct ib_device *ibdev, u8 port_num,
 129                                  struct ib_port_immutable *immutable)
 130 {
 131         struct pvrdma_dev *dev = to_vdev(ibdev);
 132         struct ib_port_attr attr;
 133         int err;
 134
 135         if (dev->dsr->caps.gid_types == PVRDMA_GID_TYPE_FLAG_ROCE_V1)
 136                 immutable->core_cap_flags |= RDMA_CORE_PORT_IBA_ROCE;
 137         else if (dev->dsr->caps.gid_types == PVRDMA_GID_TYPE_FLAG_ROCE_V2)
 138                 immutable->core_cap_flags |= RDMA_CORE_PORT_IBA_ROCE_UDP_ENCAP;
 139
 140         err = ib_query_port(ibdev, port_num, &attr);
 141         if (err)
 142                 return err;
 143
 144         immutable->pkey_tbl_len = attr.pkey_tbl_len;
 145         immutable->gid_tbl_len = attr.gid_tbl_len;
 146         immutable->max_mad_size = IB_MGMT_MAD_SIZE;
 147         return 0;
 148 }
 149
 150 static struct net_device *pvrdma_get_netdev(struct ib_device *ibdev,
 151                                             u8 port_num)
 152 {
 153         struct net_device *netdev;
 154         struct pvrdma_dev *dev = to_vdev(ibdev);
 155
 156         if (port_num != 1)
 157                 return NULL;
 158
 159         rcu_read_lock();
 160         netdev = dev->netdev;
 161         if (netdev)
 162                 dev_hold(netdev);
 163         rcu_read_unlock();
 164
 165         return netdev;
 166 }
 167
 168 static int pvrdma_register_device(struct pvrdma_dev *dev)
 169 {
 170         int ret = -1;
 171         int i = 0;
 172
 173         strlcpy(dev->ib_dev.name, "vmw_pvrdma%d", IB_DEVICE_NAME_MAX);
 174         dev->ib_dev.node_guid = dev->dsr->caps.node_guid;
 175         dev->sys_image_guid = dev->dsr->caps.sys_image_guid;
 176         dev->flags = 0;
 177         dev->ib_dev.owner = THIS_MODULE;
 178         dev->ib_dev.num_comp_vectors = 1;
 179         dev->ib_dev.dev.parent = &dev->pdev->dev;
 180         dev->ib_dev.uverbs_abi_ver = PVRDMA_UVERBS_ABI_VERSION;
 181         dev->ib_dev.uverbs_cmd_mask =
 182                 (1ull << IB_USER_VERBS_CMD_GET_CONTEXT)         |
 183                 (1ull << IB_USER_VERBS_CMD_QUERY_DEVICE)        |
 184                 (1ull << IB_USER_VERBS_CMD_QUERY_PORT)          |
 185                 (1ull << IB_USER_VERBS_CMD_ALLOC_PD)            |
 186                 (1ull << IB_USER_VERBS_CMD_DEALLOC_PD)          |
 187                 (1ull << IB_USER_VERBS_CMD_REG_MR)              |
 188                 (1ull << IB_USER_VERBS_CMD_DEREG_MR)            |
 189                 (1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
 190                 (1ull << IB_USER_VERBS_CMD_CREATE_CQ)           |
 191                 (1ull << IB_USER_VERBS_CMD_POLL_CQ)             |
 192                 (1ull << IB_USER_VERBS_CMD_REQ_NOTIFY_CQ)       |
 193                 (1ull << IB_USER_VERBS_CMD_DESTROY_CQ)          |
 194                 (1ull << IB_USER_VERBS_CMD_CREATE_QP)           |
 195                 (1ull << IB_USER_VERBS_CMD_MODIFY_QP)           |
 196                 (1ull << IB_USER_VERBS_CMD_QUERY_QP)            |
 197                 (1ull << IB_USER_VERBS_CMD_DESTROY_QP)          |
 198                 (1ull << IB_USER_VERBS_CMD_POST_SEND)           |
 199                 (1ull << IB_USER_VERBS_CMD_POST_RECV)           |
 200                 (1ull << IB_USER_VERBS_CMD_CREATE_AH)           |
 201                 (1ull << IB_USER_VERBS_CMD_DESTROY_AH);
 202
 203         dev->ib_dev.node_type = RDMA_NODE_IB_CA;
 204         dev->ib_dev.phys_port_cnt = dev->dsr->caps.phys_port_cnt;
 205
 206         dev->ib_dev.query_device = pvrdma_query_device;
 207         dev->ib_dev.query_port = pvrdma_query_port;
 208         dev->ib_dev.query_gid = pvrdma_query_gid;
 209         dev->ib_dev.query_pkey = pvrdma_query_pkey;
 210         dev->ib_dev.modify_port = pvrdma_modify_port;
 211         dev->ib_dev.alloc_ucontext = pvrdma_alloc_ucontext;
 212         dev->ib_dev.dealloc_ucontext = pvrdma_dealloc_ucontext;
 213         dev->ib_dev.mmap = pvrdma_mmap;
 214         dev->ib_dev.alloc_pd = pvrdma_alloc_pd;
 215         dev->ib_dev.dealloc_pd = pvrdma_dealloc_pd;
 216         dev->ib_dev.create_ah = pvrdma_create_ah;
 217         dev->ib_dev.destroy_ah = pvrdma_destroy_ah;
 218         dev->ib_dev.create_qp = pvrdma_create_qp;
 219         dev->ib_dev.modify_qp = pvrdma_modify_qp;
 220         dev->ib_dev.query_qp = pvrdma_query_qp;
 221         dev->ib_dev.destroy_qp = pvrdma_destroy_qp;
 222         dev->ib_dev.post_send = pvrdma_post_send;
 223         dev->ib_dev.post_recv = pvrdma_post_recv;
 224         dev->ib_dev.create_cq = pvrdma_create_cq;
 225         dev->ib_dev.modify_cq = pvrdma_modify_cq;
 226         dev->ib_dev.resize_cq = pvrdma_resize_cq;
 227         dev->ib_dev.destroy_cq = pvrdma_destroy_cq;
 228         dev->ib_dev.poll_cq = pvrdma_poll_cq;
 229         dev->ib_dev.req_notify_cq = pvrdma_req_notify_cq;
 230         dev->ib_dev.get_dma_mr = pvrdma_get_dma_mr;
 231         dev->ib_dev.reg_user_mr = pvrdma_reg_user_mr;
 232         dev->ib_dev.dereg_mr = pvrdma_dereg_mr;
 233         dev->ib_dev.alloc_mr = pvrdma_alloc_mr;
 234         dev->ib_dev.map_mr_sg = pvrdma_map_mr_sg;
 235         dev->ib_dev.add_gid = pvrdma_add_gid;
 236         dev->ib_dev.del_gid = pvrdma_del_gid;
 237         dev->ib_dev.get_netdev = pvrdma_get_netdev;
 238         dev->ib_dev.get_port_immutable = pvrdma_port_immutable;
 239         dev->ib_dev.get_link_layer = pvrdma_port_link_layer;
 240         dev->ib_dev.get_dev_fw_str = pvrdma_get_fw_ver_str;
 241
 242         mutex_init(&dev->port_mutex);
 243         spin_lock_init(&dev->desc_lock);
 244
 245         dev->cq_tbl = kcalloc(dev->dsr->caps.max_cq, sizeof(void *),
 246                               GFP_KERNEL);
 247         if (!dev->cq_tbl)
 248                 return ret;
 249         spin_lock_init(&dev->cq_tbl_lock);
 250
 251         dev->qp_tbl = kcalloc(dev->dsr->caps.max_qp, sizeof(void *),
 252                               GFP_KERNEL);
 253         if (!dev->qp_tbl)
 254                 goto err_cq_free;
 255         spin_lock_init(&dev->qp_tbl_lock);
 256
 257         ret = ib_register_device(&dev->ib_dev, NULL);
 258         if (ret)
 259                 goto err_qp_free;
 260
 261         for (i = 0; i < ARRAY_SIZE(pvrdma_class_attributes); ++i) {
 262                 ret = device_create_file(&dev->ib_dev.dev,
 263                                          pvrdma_class_attributes[i]);
 264                 if (ret)
 265                         goto err_class;
 266         }
 267
 268         dev->ib_active = true;
 269
 270         return 0;
 271
 272 err_class:
 273         ib_unregister_device(&dev->ib_dev);
 274 err_qp_free:
 275         kfree(dev->qp_tbl);
 276 err_cq_free:
 277         kfree(dev->cq_tbl);
 278
 279         return ret;
 280 }
 281
 282 static irqreturn_t pvrdma_intr0_handler(int irq, void *dev_id)
 283 {
 284         u32 icr = PVRDMA_INTR_CAUSE_RESPONSE;
 285         struct pvrdma_dev *dev = dev_id;
 286
 287         dev_dbg(&dev->pdev->dev, "interrupt 0 (response) handler\n");
 288
 289         if (!dev->pdev->msix_enabled) {
 290                 /* Legacy intr */
 291                 icr = pvrdma_read_reg(dev, PVRDMA_REG_ICR);
 292                 if (icr == 0)
 293                         return IRQ_NONE;
 294         }
 295
 296         if (icr == PVRDMA_INTR_CAUSE_RESPONSE)
 297                 complete(&dev->cmd_done);
 298
 299         return IRQ_HANDLED;
 300 }
 301
 302 static void pvrdma_qp_event(struct pvrdma_dev *dev, u32 qpn, int type)
 303 {
 304         struct pvrdma_qp *qp;
 305         unsigned long flags;
 306
 307         spin_lock_irqsave(&dev->qp_tbl_lock, flags);
 308         qp = dev->qp_tbl[qpn % dev->dsr->caps.max_qp];
 309         if (qp)
 310                 atomic_inc(&qp->refcnt);
 311         spin_unlock_irqrestore(&dev->qp_tbl_lock, flags);
 312
 313         if (qp && qp->ibqp.event_handler) {
 314                 struct ib_qp *ibqp = &qp->ibqp;
 315                 struct ib_event e;
 316
 317                 e.device = ibqp->device;
 318                 e.element.qp = ibqp;
 319                 e.event = type; /* 1:1 mapping for now. */
 320                 ibqp->event_handler(&e, ibqp->qp_context);
 321         }
 322         if (qp) {
 323                 atomic_dec(&qp->refcnt);
 324                 if (atomic_read(&qp->refcnt) == 0)
 325                         wake_up(&qp->wait);
 326         }
 327 }
 328
 329 static void pvrdma_cq_event(struct pvrdma_dev *dev, u32 cqn, int type)
 330 {
 331         struct pvrdma_cq *cq;
 332         unsigned long flags;
 333
 334         spin_lock_irqsave(&dev->cq_tbl_lock, flags);
 335         cq = dev->cq_tbl[cqn % dev->dsr->caps.max_cq];
 336         if (cq)
 337                 atomic_inc(&cq->refcnt);
 338         spin_unlock_irqrestore(&dev->cq_tbl_lock, flags);
 339
 340         if (cq && cq->ibcq.event_handler) {
 341                 struct ib_cq *ibcq = &cq->ibcq;
 342                 struct ib_event e;
 343
 344                 e.device = ibcq->device;
 345                 e.element.cq = ibcq;
 346                 e.event = type; /* 1:1 mapping for now. */
 347                 ibcq->event_handler(&e, ibcq->cq_context);
 348         }
 349         if (cq) {
 350                 atomic_dec(&cq->refcnt);
 351                 if (atomic_read(&cq->refcnt) == 0)
 352                         wake_up(&cq->wait);
 353         }
 354 }
 355
 356 static void pvrdma_dispatch_event(struct pvrdma_dev *dev, int port,
 357                                   enum ib_event_type event)
 358 {
 359         struct ib_event ib_event;
 360
 361         memset(&ib_event, 0, sizeof(ib_event));
 362         ib_event.device = &dev->ib_dev;
 363         ib_event.element.port_num = port;
 364         ib_event.event = event;
 365         ib_dispatch_event(&ib_event);
 366 }
 367
 368 static void pvrdma_dev_event(struct pvrdma_dev *dev, u8 port, int type)
 369 {
 370         if (port < 1 || port > dev->dsr->caps.phys_port_cnt) {
 371                 dev_warn(&dev->pdev->dev, "event on port %d\n", port);
 372                 return;
 373         }
 374
 375         pvrdma_dispatch_event(dev, port, type);
 376 }
 377
 378 static inline struct pvrdma_eqe *get_eqe(struct pvrdma_dev *dev, unsigned int i)
 379 {
 380         return (struct pvrdma_eqe *)pvrdma_page_dir_get_ptr(
 381                                         &dev->async_pdir,
 382                                         PAGE_SIZE +
 383                                         sizeof(struct pvrdma_eqe) * i);
 384 }
 385
 386 static irqreturn_t pvrdma_intr1_handler(int irq, void *dev_id)
 387 {
 388         struct pvrdma_dev *dev = dev_id;
 389         struct pvrdma_ring *ring = &dev->async_ring_state->rx;
 390         int ring_slots = (dev->dsr->async_ring_pages.num_pages - 1) *
 391                          PAGE_SIZE / sizeof(struct pvrdma_eqe);
 392         unsigned int head;
 393
 394         dev_dbg(&dev->pdev->dev, "interrupt 1 (async event) handler\n");
 395
 396         /*
 397          * Don't process events until the IB device is registered. Otherwise
 398          * we'll try to ib_dispatch_event() on an invalid device.
 399          */
 400         if (!dev->ib_active)
 401                 return IRQ_HANDLED;
 402
 403         while (pvrdma_idx_ring_has_data(ring, ring_slots, &head) > 0) {
 404                 struct pvrdma_eqe *eqe;
 405
 406                 eqe = get_eqe(dev, head);
 407
 408                 switch (eqe->type) {
 409                 case PVRDMA_EVENT_QP_FATAL:
 410                 case PVRDMA_EVENT_QP_REQ_ERR:
 411                 case PVRDMA_EVENT_QP_ACCESS_ERR:
 412                 case PVRDMA_EVENT_COMM_EST:
 413                 case PVRDMA_EVENT_SQ_DRAINED:
 414                 case PVRDMA_EVENT_PATH_MIG:
 415                 case PVRDMA_EVENT_PATH_MIG_ERR:
 416                 case PVRDMA_EVENT_QP_LAST_WQE_REACHED:
 417                         pvrdma_qp_event(dev, eqe->info, eqe->type);
 418                         break;
 419
 420                 case PVRDMA_EVENT_CQ_ERR:
 421                         pvrdma_cq_event(dev, eqe->info, eqe->type);
 422                         break;
 423
 424                 case PVRDMA_EVENT_SRQ_ERR:
 425                 case PVRDMA_EVENT_SRQ_LIMIT_REACHED:
 426                         break;
 427
 428                 case PVRDMA_EVENT_PORT_ACTIVE:
 429                 case PVRDMA_EVENT_PORT_ERR:
 430                 case PVRDMA_EVENT_LID_CHANGE:
 431                 case PVRDMA_EVENT_PKEY_CHANGE:
 432                 case PVRDMA_EVENT_SM_CHANGE:
 433                 case PVRDMA_EVENT_CLIENT_REREGISTER:
 434                 case PVRDMA_EVENT_GID_CHANGE:
 435                         pvrdma_dev_event(dev, eqe->info, eqe->type);
 436                         break;
 437
 438                 case PVRDMA_EVENT_DEVICE_FATAL:
 439                         pvrdma_dev_event(dev, 1, eqe->type);
 440                         break;
 441
 442                 default:
 443                         break;
 444                 }
 445
 446                 pvrdma_idx_ring_inc(&ring->cons_head, ring_slots);
 447         }
 448
 449         return IRQ_HANDLED;
 450 }
 451
 452 static inline struct pvrdma_cqne *get_cqne(struct pvrdma_dev *dev,
 453                                            unsigned int i)
 454 {
 455         return (struct pvrdma_cqne *)pvrdma_page_dir_get_ptr(
 456                                         &dev->cq_pdir,
 457                                         PAGE_SIZE +
 458                                         sizeof(struct pvrdma_cqne) * i);
 459 }
 460
 461 static irqreturn_t pvrdma_intrx_handler(int irq, void *dev_id)
 462 {
 463         struct pvrdma_dev *dev = dev_id;
 464         struct pvrdma_ring *ring = &dev->cq_ring_state->rx;
 465         int ring_slots = (dev->dsr->cq_ring_pages.num_pages - 1) * PAGE_SIZE /
 466                          sizeof(struct pvrdma_cqne);
 467         unsigned int head;
 468         unsigned long flags;
 469
 470         dev_dbg(&dev->pdev->dev, "interrupt x (completion) handler\n");
 471
 472         while (pvrdma_idx_ring_has_data(ring, ring_slots, &head) > 0) {
 473                 struct pvrdma_cqne *cqne;
 474                 struct pvrdma_cq *cq;
 475
 476                 cqne = get_cqne(dev, head);
 477                 spin_lock_irqsave(&dev->cq_tbl_lock, flags);
 478                 cq = dev->cq_tbl[cqne->info % dev->dsr->caps.max_cq];
 479                 if (cq)
 480                         atomic_inc(&cq->refcnt);
 481                 spin_unlock_irqrestore(&dev->cq_tbl_lock, flags);
 482
 483                 if (cq && cq->ibcq.comp_handler)
 484                         cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
 485                 if (cq) {
 486                         atomic_dec(&cq->refcnt);
 487                         if (atomic_read(&cq->refcnt))
 488                                 wake_up(&cq->wait);
 489                 }
 490                 pvrdma_idx_ring_inc(&ring->cons_head, ring_slots);
 491         }
 492
 493         return IRQ_HANDLED;
 494 }
 495
 496 static void pvrdma_free_irq(struct pvrdma_dev *dev)
 497 {
 498         int i;
 499
 500         dev_dbg(&dev->pdev->dev, "freeing interrupts\n");
 501         for (i = 0; i < dev->nr_vectors; i++)
 502                 free_irq(pci_irq_vector(dev->pdev, i), dev);
 503 }
 504
 505 static void pvrdma_enable_intrs(struct pvrdma_dev *dev)
 506 {
 507         dev_dbg(&dev->pdev->dev, "enable interrupts\n");
 508         pvrdma_write_reg(dev, PVRDMA_REG_IMR, 0);
 509 }
 510
 511 static void pvrdma_disable_intrs(struct pvrdma_dev *dev)
 512 {
 513         dev_dbg(&dev->pdev->dev, "disable interrupts\n");
 514         pvrdma_write_reg(dev, PVRDMA_REG_IMR, ~0);
 515 }
 516
 517 static int pvrdma_alloc_intrs(struct pvrdma_dev *dev)
 518 {
 519         struct pci_dev *pdev = dev->pdev;
 520         int ret = 0, i;
 521
 522         ret = pci_alloc_irq_vectors(pdev, 1, PVRDMA_MAX_INTERRUPTS,
 523                         PCI_IRQ_MSIX);
 524         if (ret < 0) {
 525                 ret = pci_alloc_irq_vectors(pdev, 1, 1,
 526                                 PCI_IRQ_MSI | PCI_IRQ_LEGACY);
 527                 if (ret < 0)
 528                         return ret;
 529         }
 530         dev->nr_vectors = ret;
 531
 532         ret = request_irq(pci_irq_vector(dev->pdev, 0), pvrdma_intr0_handler,
 533                         pdev->msix_enabled ? 0 : IRQF_SHARED, DRV_NAME, dev);
 534         if (ret) {
 535                 dev_err(&dev->pdev->dev,
 536                         "failed to request interrupt 0\n");
 537                 goto out_free_vectors;
 538         }
 539
 540         for (i = 1; i < dev->nr_vectors; i++) {
 541                 ret = request_irq(pci_irq_vector(dev->pdev, i),
 542                                 i == 1 ? pvrdma_intr1_handler :
 543                                          pvrdma_intrx_handler,
 544                                 0, DRV_NAME, dev);
 545                 if (ret) {
 546                         dev_err(&dev->pdev->dev,
 547                                 "failed to request interrupt %d\n", i);
 548                         goto free_irqs;
 549                 }
 550         }
 551
 552         return 0;
 553
 554 free_irqs:
 555         while (--i >= 0)
 556                 free_irq(pci_irq_vector(dev->pdev, i), dev);
 557 out_free_vectors:
 558         pci_free_irq_vectors(pdev);
 559         return ret;
 560 }
 561
 562 static void pvrdma_free_slots(struct pvrdma_dev *dev)
 563 {
 564         struct pci_dev *pdev = dev->pdev;
 565
 566         if (dev->resp_slot)
 567                 dma_free_coherent(&pdev->dev, PAGE_SIZE, dev->resp_slot,
 568                                   dev->dsr->resp_slot_dma);
 569         if (dev->cmd_slot)
 570                 dma_free_coherent(&pdev->dev, PAGE_SIZE, dev->cmd_slot,
 571                                   dev->dsr->cmd_slot_dma);
 572 }
 573
 574 static int pvrdma_add_gid_at_index(struct pvrdma_dev *dev,
 575                                    const union ib_gid *gid,
 576                                    u8 gid_type,
 577                                    int index)
 578 {
 579         int ret;
 580         union pvrdma_cmd_req req;
 581         struct pvrdma_cmd_create_bind *cmd_bind = &req.create_bind;
 582
 583         if (!dev->sgid_tbl) {
 584                 dev_warn(&dev->pdev->dev, "sgid table not initialized\n");
 585                 return -EINVAL;
 586         }
 587
 588         memset(cmd_bind, 0, sizeof(*cmd_bind));
 589         cmd_bind->hdr.cmd = PVRDMA_CMD_CREATE_BIND;
 590         memcpy(cmd_bind->new_gid, gid->raw, 16);
 591         cmd_bind->mtu = ib_mtu_enum_to_int(IB_MTU_1024);
 592         cmd_bind->vlan = 0xfff;
 593         cmd_bind->index = index;
 594         cmd_bind->gid_type = gid_type;
 595
 596         ret = pvrdma_cmd_post(dev, &req, NULL, 0);
 597         if (ret < 0) {
 598                 dev_warn(&dev->pdev->dev,
 599                          "could not create binding, error: %d\n", ret);
 600                 return -EFAULT;
 601         }
 602         memcpy(&dev->sgid_tbl[index], gid, sizeof(*gid));
 603         return 0;
 604 }
 605
 606 static int pvrdma_add_gid(struct ib_device *ibdev,
 607                           u8 port_num,
 608                           unsigned int index,
 609                           const union ib_gid *gid,
 610                           const struct ib_gid_attr *attr,
 611                           void **context)
 612 {
 613         struct pvrdma_dev *dev = to_vdev(ibdev);
 614
 615         return pvrdma_add_gid_at_index(dev, gid,
 616                                        ib_gid_type_to_pvrdma(attr->gid_type),
 617                                        index);
 618 }
 619
 620 static int pvrdma_del_gid_at_index(struct pvrdma_dev *dev, int index)
 621 {
 622         int ret;
 623         union pvrdma_cmd_req req;
 624         struct pvrdma_cmd_destroy_bind *cmd_dest = &req.destroy_bind;
 625
 626         /* Update sgid table. */
 627         if (!dev->sgid_tbl) {
 628                 dev_warn(&dev->pdev->dev, "sgid table not initialized\n");
 629                 return -EINVAL;
 630         }
 631
 632         memset(cmd_dest, 0, sizeof(*cmd_dest));
 633         cmd_dest->hdr.cmd = PVRDMA_CMD_DESTROY_BIND;
 634         memcpy(cmd_dest->dest_gid, &dev->sgid_tbl[index], 16);
 635         cmd_dest->index = index;
 636
 637         ret = pvrdma_cmd_post(dev, &req, NULL, 0);
 638         if (ret < 0) {
 639                 dev_warn(&dev->pdev->dev,
 640                          "could not destroy binding, error: %d\n", ret);
 641                 return ret;
 642         }
 643         memset(&dev->sgid_tbl[index], 0, 16);
 644         return 0;
 645 }
 646
 647 static int pvrdma_del_gid(struct ib_device *ibdev,
 648                           u8 port_num,
 649                           unsigned int index,
 650                           void **context)
 651 {
 652         struct pvrdma_dev *dev = to_vdev(ibdev);
 653
 654         dev_dbg(&dev->pdev->dev, "removing gid at index %u from %s",
 655                 index, dev->netdev->name);
 656
 657         return pvrdma_del_gid_at_index(dev, index);
 658 }
 659
 660 static void pvrdma_netdevice_event_handle(struct pvrdma_dev *dev,
 661                                           unsigned long event)
 662 {
 663         switch (event) {
 664         case NETDEV_REBOOT:
 665         case NETDEV_DOWN:
 666                 pvrdma_dispatch_event(dev, 1, IB_EVENT_PORT_ERR);
 667                 break;
 668         case NETDEV_UP:
 669                 pvrdma_write_reg(dev, PVRDMA_REG_CTL,
 670                                  PVRDMA_DEVICE_CTL_UNQUIESCE);
 671
 672                 mb();
 673
 674                 if (pvrdma_read_reg(dev, PVRDMA_REG_ERR))
 675                         dev_err(&dev->pdev->dev,
 676                                 "failed to activate device during link up\n");
 677                 else
 678                         pvrdma_dispatch_event(dev, 1, IB_EVENT_PORT_ACTIVE);
 679                 break;
 680         default:
 681                 dev_dbg(&dev->pdev->dev, "ignore netdevice event %ld on %s\n",
 682                         event, dev->ib_dev.name);
 683                 break;
 684         }
 685 }
 686
 687 static void pvrdma_netdevice_event_work(struct work_struct *work)
 688 {
 689         struct pvrdma_netdevice_work *netdev_work;
 690         struct pvrdma_dev *dev;
 691
 692         netdev_work = container_of(work, struct pvrdma_netdevice_work, work);
 693
 694         mutex_lock(&pvrdma_device_list_lock);
 695         list_for_each_entry(dev, &pvrdma_device_list, device_link) {
 696                 if (dev->netdev == netdev_work->event_netdev) {
 697                         pvrdma_netdevice_event_handle(dev, netdev_work->event);
 698                         break;
 699                 }
 700         }
 701         mutex_unlock(&pvrdma_device_list_lock);
 702
 703         kfree(netdev_work);
 704 }
 705
 706 static int pvrdma_netdevice_event(struct notifier_block *this,
 707                                   unsigned long event, void *ptr)
 708 {
 709         struct net_device *event_netdev = netdev_notifier_info_to_dev(ptr);
 710         struct pvrdma_netdevice_work *netdev_work;
 711
 712         netdev_work = kmalloc(sizeof(*netdev_work), GFP_ATOMIC);
 713         if (!netdev_work)
 714                 return NOTIFY_BAD;
 715
 716         INIT_WORK(&netdev_work->work, pvrdma_netdevice_event_work);
 717         netdev_work->event_netdev = event_netdev;
 718         netdev_work->event = event;
 719         queue_work(event_wq, &netdev_work->work);
 720
 721         return NOTIFY_DONE;
 722 }
 723
 724 static int pvrdma_pci_probe(struct pci_dev *pdev,
 725                             const struct pci_device_id *id)
 726 {
 727         struct pci_dev *pdev_net;
 728         struct pvrdma_dev *dev;
 729         int ret;
 730         unsigned long start;
 731         unsigned long len;
 732         dma_addr_t slot_dma = 0;
 733
 734         dev_dbg(&pdev->dev, "initializing driver %s\n", pci_name(pdev));
 735
 736         /* Allocate zero-out device */
 737         dev = (struct pvrdma_dev *)ib_alloc_device(sizeof(*dev));
 738         if (!dev) {
 739                 dev_err(&pdev->dev, "failed to allocate IB device\n");
 740                 return -ENOMEM;
 741         }
 742
 743         mutex_lock(&pvrdma_device_list_lock);
 744         list_add(&dev->device_link, &pvrdma_device_list);
 745         mutex_unlock(&pvrdma_device_list_lock);
 746
 747         ret = pvrdma_init_device(dev);
 748         if (ret)
 749                 goto err_free_device;
 750
 751         dev->pdev = pdev;
 752         pci_set_drvdata(pdev, dev);
 753
 754         ret = pci_enable_device(pdev);
 755         if (ret) {
 756                 dev_err(&pdev->dev, "cannot enable PCI device\n");
 757                 goto err_free_device;
 758         }
 759
 760         dev_dbg(&pdev->dev, "PCI resource flags BAR0 %#lx\n",
 761                 pci_resource_flags(pdev, 0));
 762         dev_dbg(&pdev->dev, "PCI resource len %#llx\n",
 763                 (unsigned long long)pci_resource_len(pdev, 0));
 764         dev_dbg(&pdev->dev, "PCI resource start %#llx\n",
 765                 (unsigned long long)pci_resource_start(pdev, 0));
 766         dev_dbg(&pdev->dev, "PCI resource flags BAR1 %#lx\n",
 767                 pci_resource_flags(pdev, 1));
 768         dev_dbg(&pdev->dev, "PCI resource len %#llx\n",
 769                 (unsigned long long)pci_resource_len(pdev, 1));
 770         dev_dbg(&pdev->dev, "PCI resource start %#llx\n",
 771                 (unsigned long long)pci_resource_start(pdev, 1));
 772
 773         if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
 774             !(pci_resource_flags(pdev, 1) & IORESOURCE_MEM)) {
 775                 dev_err(&pdev->dev, "PCI BAR region not MMIO\n");
 776                 ret = -ENOMEM;
 777                 goto err_free_device;
 778         }
 779
 780         ret = pci_request_regions(pdev, DRV_NAME);
 781         if (ret) {
 782                 dev_err(&pdev->dev, "cannot request PCI resources\n");
 783                 goto err_disable_pdev;
 784         }
 785
 786         /* Enable 64-Bit DMA */
 787         if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) == 0) {
 788                 ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 789                 if (ret != 0) {
 790                         dev_err(&pdev->dev,
 791                                 "pci_set_consistent_dma_mask failed\n");
 792                         goto err_free_resource;
 793                 }
 794         } else {
 795                 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 796                 if (ret != 0) {
 797                         dev_err(&pdev->dev,
 798                                 "pci_set_dma_mask failed\n");
 799                         goto err_free_resource;
 800                 }
 801         }
 802
 803         pci_set_master(pdev);
 804
 805         /* Map register space */
 806         start = pci_resource_start(dev->pdev, PVRDMA_PCI_RESOURCE_REG);
 807         len = pci_resource_len(dev->pdev, PVRDMA_PCI_RESOURCE_REG);
 808         dev->regs = ioremap(start, len);
 809         if (!dev->regs) {
 810                 dev_err(&pdev->dev, "register mapping failed\n");
 811                 ret = -ENOMEM;
 812                 goto err_free_resource;
 813         }
 814
 815         /* Setup per-device UAR. */
 816         dev->driver_uar.index = 0;
 817         dev->driver_uar.pfn =
 818                 pci_resource_start(dev->pdev, PVRDMA_PCI_RESOURCE_UAR) >>
 819                 PAGE_SHIFT;
 820         dev->driver_uar.map =
 821                 ioremap(dev->driver_uar.pfn << PAGE_SHIFT, PAGE_SIZE);
 822         if (!dev->driver_uar.map) {
 823                 dev_err(&pdev->dev, "failed to remap UAR pages\n");
 824                 ret = -ENOMEM;
 825                 goto err_unmap_regs;
 826         }
 827
 828         dev->dsr_version = pvrdma_read_reg(dev, PVRDMA_REG_VERSION);
 829         dev_info(&pdev->dev, "device version %d, driver version %d\n",
 830                  dev->dsr_version, PVRDMA_VERSION);
 831
 832         dev->dsr = dma_alloc_coherent(&pdev->dev, sizeof(*dev->dsr),
 833                                       &dev->dsrbase, GFP_KERNEL);
 834         if (!dev->dsr) {
 835                 dev_err(&pdev->dev, "failed to allocate shared region\n");
 836                 ret = -ENOMEM;
 837                 goto err_uar_unmap;
 838         }
 839
 840         /* Setup the shared region */
 841         memset(dev->dsr, 0, sizeof(*dev->dsr));
 842         dev->dsr->driver_version = PVRDMA_VERSION;
 843         dev->dsr->gos_info.gos_bits = sizeof(void *) == 4 ?
 844                 PVRDMA_GOS_BITS_32 :
 845                 PVRDMA_GOS_BITS_64;
 846         dev->dsr->gos_info.gos_type = PVRDMA_GOS_TYPE_LINUX;
 847         dev->dsr->gos_info.gos_ver = 1;
 848         dev->dsr->uar_pfn = dev->driver_uar.pfn;
 849
 850         /* Command slot. */
 851         dev->cmd_slot = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
 852                                            &slot_dma, GFP_KERNEL);
 853         if (!dev->cmd_slot) {
 854                 ret = -ENOMEM;
 855                 goto err_free_dsr;
 856         }
 857
 858         dev->dsr->cmd_slot_dma = (u64)slot_dma;
 859
 860         /* Response slot. */
 861         dev->resp_slot = dma_alloc_coherent(&pdev->dev, PAGE_SIZE,
 862                                             &slot_dma, GFP_KERNEL);
 863         if (!dev->resp_slot) {
 864                 ret = -ENOMEM;
 865                 goto err_free_slots;
 866         }
 867
 868         dev->dsr->resp_slot_dma = (u64)slot_dma;
 869
 870         /* Async event ring */
 871         dev->dsr->async_ring_pages.num_pages = PVRDMA_NUM_RING_PAGES;
 872         ret = pvrdma_page_dir_init(dev, &dev->async_pdir,
 873                                    dev->dsr->async_ring_pages.num_pages, true);
 874         if (ret)
 875                 goto err_free_slots;
 876         dev->async_ring_state = dev->async_pdir.pages[0];
 877         dev->dsr->async_ring_pages.pdir_dma = dev->async_pdir.dir_dma;
 878
 879         /* CQ notification ring */
 880         dev->dsr->cq_ring_pages.num_pages = PVRDMA_NUM_RING_PAGES;
 881         ret = pvrdma_page_dir_init(dev, &dev->cq_pdir,
 882                                    dev->dsr->cq_ring_pages.num_pages, true);
 883         if (ret)
 884                 goto err_free_async_ring;
 885         dev->cq_ring_state = dev->cq_pdir.pages[0];
 886         dev->dsr->cq_ring_pages.pdir_dma = dev->cq_pdir.dir_dma;
 887
 888         /*
 889          * Write the PA of the shared region to the device. The writes must be
 890          * ordered such that the high bits are written last. When the writes
 891          * complete, the device will have filled out the capabilities.
 892          */
 893
 894         pvrdma_write_reg(dev, PVRDMA_REG_DSRLOW, (u32)dev->dsrbase);
 895         pvrdma_write_reg(dev, PVRDMA_REG_DSRHIGH,
 896                          (u32)((u64)(dev->dsrbase) >> 32));
 897
 898         /* Make sure the write is complete before reading status. */
 899         mb();
 900
 901         /* The driver supports RoCE V1 and V2. */
 902         if (!PVRDMA_SUPPORTED(dev)) {
 903                 dev_err(&pdev->dev, "driver needs RoCE v1 or v2 support\n");
 904                 ret = -EFAULT;
 905                 goto err_free_cq_ring;
 906         }
 907
 908         /* Paired vmxnet3 will have same bus, slot. But func will be 0 */
 909         pdev_net = pci_get_slot(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
 910         if (!pdev_net) {
 911                 dev_err(&pdev->dev, "failed to find paired net device\n");
 912                 ret = -ENODEV;
 913                 goto err_free_cq_ring;
 914         }
 915
 916         if (pdev_net->vendor != PCI_VENDOR_ID_VMWARE ||
 917             pdev_net->device != PCI_DEVICE_ID_VMWARE_VMXNET3) {
 918                 dev_err(&pdev->dev, "failed to find paired vmxnet3 device\n");
 919                 pci_dev_put(pdev_net);
 920                 ret = -ENODEV;
 921                 goto err_free_cq_ring;
 922         }
 923
 924         dev->netdev = pci_get_drvdata(pdev_net);
 925         pci_dev_put(pdev_net);
 926         if (!dev->netdev) {
 927                 dev_err(&pdev->dev, "failed to get vmxnet3 device\n");
 928                 ret = -ENODEV;
 929                 goto err_free_cq_ring;
 930         }
 931
 932         dev_info(&pdev->dev, "paired device to %s\n", dev->netdev->name);
 933
 934         /* Interrupt setup */
 935         ret = pvrdma_alloc_intrs(dev);
 936         if (ret) {
 937                 dev_err(&pdev->dev, "failed to allocate interrupts\n");
 938                 ret = -ENOMEM;
 939                 goto err_free_cq_ring;
 940         }
 941
 942         /* Allocate UAR table. */
 943         ret = pvrdma_uar_table_init(dev);
 944         if (ret) {
 945                 dev_err(&pdev->dev, "failed to allocate UAR table\n");
 946                 ret = -ENOMEM;
 947                 goto err_free_intrs;
 948         }
 949
 950         /* Allocate GID table */
 951         dev->sgid_tbl = kcalloc(dev->dsr->caps.gid_tbl_len,
 952                                 sizeof(union ib_gid), GFP_KERNEL);
 953         if (!dev->sgid_tbl) {
 954                 ret = -ENOMEM;
 955                 goto err_free_uar_table;
 956         }
 957         dev_dbg(&pdev->dev, "gid table len %d\n", dev->dsr->caps.gid_tbl_len);
 958
 959         pvrdma_enable_intrs(dev);
 960
 961         /* Activate pvrdma device */
 962         pvrdma_write_reg(dev, PVRDMA_REG_CTL, PVRDMA_DEVICE_CTL_ACTIVATE);
 963
 964         /* Make sure the write is complete before reading status. */
 965         mb();
 966
 967         /* Check if device was successfully activated */
 968         ret = pvrdma_read_reg(dev, PVRDMA_REG_ERR);
 969         if (ret != 0) {
 970                 dev_err(&pdev->dev, "failed to activate device\n");
 971                 ret = -EFAULT;
 972                 goto err_disable_intr;
 973         }
 974
 975         /* Register IB device */
 976         ret = pvrdma_register_device(dev);
 977         if (ret) {
 978                 dev_err(&pdev->dev, "failed to register IB device\n");
 979                 goto err_disable_intr;
 980         }
 981
 982         dev->nb_netdev.notifier_call = pvrdma_netdevice_event;
 983         ret = register_netdevice_notifier(&dev->nb_netdev);
 984         if (ret) {
 985                 dev_err(&pdev->dev, "failed to register netdevice events\n");
 986                 goto err_unreg_ibdev;
 987         }
 988
 989         dev_info(&pdev->dev, "attached to device\n");
 990         return 0;
 991
 992 err_unreg_ibdev:
 993         ib_unregister_device(&dev->ib_dev);
 994 err_disable_intr:
 995         pvrdma_disable_intrs(dev);
 996         kfree(dev->sgid_tbl);
 997 err_free_uar_table:
 998         pvrdma_uar_table_cleanup(dev);
 999 err_free_intrs:
1000         pvrdma_free_irq(dev);
1001         pci_free_irq_vectors(pdev);
1002 err_free_cq_ring:
1003         pvrdma_page_dir_cleanup(dev, &dev->cq_pdir);
1004 err_free_async_ring:
1005         pvrdma_page_dir_cleanup(dev, &dev->async_pdir);
1006 err_free_slots:
1007         pvrdma_free_slots(dev);
1008 err_free_dsr:
1009         dma_free_coherent(&pdev->dev, sizeof(*dev->dsr), dev->dsr,
1010                           dev->dsrbase);
1011 err_uar_unmap:
1012         iounmap(dev->driver_uar.map);
1013 err_unmap_regs:
1014         iounmap(dev->regs);
1015 err_free_resource:
1016         pci_release_regions(pdev);
1017 err_disable_pdev:
1018         pci_disable_device(pdev);
1019         pci_set_drvdata(pdev, NULL);
1020 err_free_device:
1021         mutex_lock(&pvrdma_device_list_lock);
1022         list_del(&dev->device_link);
1023         mutex_unlock(&pvrdma_device_list_lock);
1024         ib_dealloc_device(&dev->ib_dev);
1025         return ret;
1026 }
1027
1028 static void pvrdma_pci_remove(struct pci_dev *pdev)
1029 {
1030         struct pvrdma_dev *dev = pci_get_drvdata(pdev);
1031
1032         if (!dev)
1033                 return;
1034
1035         dev_info(&pdev->dev, "detaching from device\n");
1036
1037         unregister_netdevice_notifier(&dev->nb_netdev);
1038         dev->nb_netdev.notifier_call = NULL;
1039
1040         flush_workqueue(event_wq);
1041
1042         /* Unregister ib device */
1043         ib_unregister_device(&dev->ib_dev);
1044
1045         mutex_lock(&pvrdma_device_list_lock);
1046         list_del(&dev->device_link);
1047         mutex_unlock(&pvrdma_device_list_lock);
1048
1049         pvrdma_disable_intrs(dev);
1050         pvrdma_free_irq(dev);
1051         pci_free_irq_vectors(pdev);
1052
1053         /* Deactivate pvrdma device */
1054         pvrdma_write_reg(dev, PVRDMA_REG_CTL, PVRDMA_DEVICE_CTL_RESET);
1055         pvrdma_page_dir_cleanup(dev, &dev->cq_pdir);
1056         pvrdma_page_dir_cleanup(dev, &dev->async_pdir);
1057         pvrdma_free_slots(dev);
1058
1059         iounmap(dev->regs);
1060         kfree(dev->sgid_tbl);
1061         kfree(dev->cq_tbl);
1062         kfree(dev->qp_tbl);
1063         pvrdma_uar_table_cleanup(dev);
1064         iounmap(dev->driver_uar.map);
1065
1066         ib_dealloc_device(&dev->ib_dev);
1067
1068         /* Free pci resources */
1069         pci_release_regions(pdev);
1070         pci_disable_device(pdev);
1071         pci_set_drvdata(pdev, NULL);
1072 }
1073
1074 static const struct pci_device_id pvrdma_pci_table[] = {
1075         { PCI_DEVICE(PCI_VENDOR_ID_VMWARE, PCI_DEVICE_ID_VMWARE_PVRDMA), },
1076         { 0 },
1077 };
1078
1079 MODULE_DEVICE_TABLE(pci, pvrdma_pci_table);
1080
1081 static struct pci_driver pvrdma_driver = {
1082         .name           = DRV_NAME,
1083         .id_table       = pvrdma_pci_table,
1084         .probe          = pvrdma_pci_probe,
1085         .remove         = pvrdma_pci_remove,
1086 };
1087
1088 static int __init pvrdma_init(void)
1089 {
1090         int err;
1091
1092         event_wq = alloc_ordered_workqueue("pvrdma_event_wq", WQ_MEM_RECLAIM);
1093         if (!event_wq)
1094                 return -ENOMEM;
1095
1096         err = pci_register_driver(&pvrdma_driver);
1097         if (err)
1098                 destroy_workqueue(event_wq);
1099
1100         return err;
1101 }
1102
1103 static void __exit pvrdma_cleanup(void)
1104 {
1105         pci_unregister_driver(&pvrdma_driver);
1106
1107         destroy_workqueue(event_wq);
1108 }
1109
1110 module_init(pvrdma_init);
1111 module_exit(pvrdma_cleanup);
1112
1113 MODULE_AUTHOR("VMware, Inc");
1114 MODULE_DESCRIPTION("VMware Paravirtual RDMA driver");
1115 MODULE_LICENSE("Dual BSD/GPL");