drivers/infiniband/hw/erdma/erdma_main.c

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2
   3 /* Authors: Cheng Xu <[email protected]> */
   4 /*          Kai Shen <[email protected]> */
   5 /* Copyright (c) 2020-2022, Alibaba Group. */
   6
   7 #include <linux/module.h>
   8 #include <net/addrconf.h>
   9 #include <rdma/erdma-abi.h>
  10
  11 #include "erdma.h"
  12 #include "erdma_cm.h"
  13 #include "erdma_verbs.h"
  14
  15 MODULE_AUTHOR("Cheng Xu <[email protected]>");
  16 MODULE_DESCRIPTION("Alibaba elasticRDMA adapter driver");
  17 MODULE_LICENSE("Dual BSD/GPL");
  18
  19 static int erdma_netdev_event(struct notifier_block *nb, unsigned long event,
  20                               void *arg)
  21 {
  22         struct net_device *netdev = netdev_notifier_info_to_dev(arg);
  23         struct erdma_dev *dev = container_of(nb, struct erdma_dev, netdev_nb);
  24
  25         if (dev->netdev == NULL || dev->netdev != netdev)
  26                 goto done;
  27
  28         switch (event) {
  29         case NETDEV_UP:
  30                 dev->state = IB_PORT_ACTIVE;
  31                 erdma_port_event(dev, IB_EVENT_PORT_ACTIVE);
  32                 break;
  33         case NETDEV_DOWN:
  34                 dev->state = IB_PORT_DOWN;
  35                 erdma_port_event(dev, IB_EVENT_PORT_ERR);
  36                 break;
  37         case NETDEV_CHANGEMTU:
  38                 if (dev->mtu != netdev->mtu) {
  39                         erdma_set_mtu(dev, netdev->mtu);
  40                         dev->mtu = netdev->mtu;
  41                 }
  42                 break;
  43         case NETDEV_REGISTER:
  44         case NETDEV_UNREGISTER:
  45         case NETDEV_CHANGEADDR:
  46         case NETDEV_GOING_DOWN:
  47         case NETDEV_CHANGE:
  48         default:
  49                 break;
  50         }
  51
  52 done:
  53         return NOTIFY_OK;
  54 }
  55
  56 static int erdma_enum_and_get_netdev(struct erdma_dev *dev)
  57 {
  58         struct net_device *netdev;
  59         int ret = -EPROBE_DEFER;
  60
  61         /* Already binded to a net_device, so we skip. */
  62         if (dev->netdev)
  63                 return 0;
  64
  65         rtnl_lock();
  66         for_each_netdev(&init_net, netdev) {
  67                 /*
  68                  * In erdma, the paired netdev and ibdev should have the same
  69                  * MAC address. erdma can get the value from its PCIe bar
  70                  * registers. Since erdma can not get the paired netdev
  71                  * reference directly, we do a traverse here to get the paired
  72                  * netdev.
  73                  */
  74                 if (ether_addr_equal_unaligned(netdev->perm_addr,
  75                                                dev->attrs.peer_addr)) {
  76                         ret = ib_device_set_netdev(&dev->ibdev, netdev, 1);
  77                         if (ret) {
  78                                 rtnl_unlock();
  79                                 ibdev_warn(&dev->ibdev,
  80                                            "failed (%d) to link netdev", ret);
  81                                 return ret;
  82                         }
  83
  84                         dev->netdev = netdev;
  85                         break;
  86                 }
  87         }
  88
  89         rtnl_unlock();
  90
  91         return ret;
  92 }
  93
  94 static int erdma_device_register(struct erdma_dev *dev)
  95 {
  96         struct ib_device *ibdev = &dev->ibdev;
  97         int ret;
  98
  99         ret = erdma_enum_and_get_netdev(dev);
 100         if (ret)
 101                 return ret;
 102
 103         dev->mtu = dev->netdev->mtu;
 104         addrconf_addr_eui48((u8 *)&ibdev->node_guid, dev->netdev->dev_addr);
 105
 106         ret = ib_register_device(ibdev, "erdma_%d", &dev->pdev->dev);
 107         if (ret) {
 108                 dev_err(&dev->pdev->dev,
 109                         "ib_register_device failed: ret = %d\n", ret);
 110                 return ret;
 111         }
 112
 113         dev->netdev_nb.notifier_call = erdma_netdev_event;
 114         ret = register_netdevice_notifier(&dev->netdev_nb);
 115         if (ret) {
 116                 ibdev_err(&dev->ibdev, "failed to register notifier.\n");
 117                 ib_unregister_device(ibdev);
 118         }
 119
 120         return ret;
 121 }
 122
 123 static irqreturn_t erdma_comm_irq_handler(int irq, void *data)
 124 {
 125         struct erdma_dev *dev = data;
 126
 127         erdma_cmdq_completion_handler(&dev->cmdq);
 128         erdma_aeq_event_handler(dev);
 129
 130         return IRQ_HANDLED;
 131 }
 132
 133 static int erdma_request_vectors(struct erdma_dev *dev)
 134 {
 135         int expect_irq_num = min(num_possible_cpus() + 1, ERDMA_NUM_MSIX_VEC);
 136         int ret;
 137
 138         ret = pci_alloc_irq_vectors(dev->pdev, 1, expect_irq_num, PCI_IRQ_MSIX);
 139         if (ret < 0) {
 140                 dev_err(&dev->pdev->dev, "request irq vectors failed(%d)\n",
 141                         ret);
 142                 return ret;
 143         }
 144         dev->attrs.irq_num = ret;
 145
 146         return 0;
 147 }
 148
 149 static int erdma_comm_irq_init(struct erdma_dev *dev)
 150 {
 151         snprintf(dev->comm_irq.name, ERDMA_IRQNAME_SIZE, "erdma-common@pci:%s",
 152                  pci_name(dev->pdev));
 153         dev->comm_irq.msix_vector =
 154                 pci_irq_vector(dev->pdev, ERDMA_MSIX_VECTOR_CMDQ);
 155
 156         cpumask_set_cpu(cpumask_first(cpumask_of_pcibus(dev->pdev->bus)),
 157                         &dev->comm_irq.affinity_hint_mask);
 158         irq_set_affinity_hint(dev->comm_irq.msix_vector,
 159                               &dev->comm_irq.affinity_hint_mask);
 160
 161         return request_irq(dev->comm_irq.msix_vector, erdma_comm_irq_handler, 0,
 162                            dev->comm_irq.name, dev);
 163 }
 164
 165 static void erdma_comm_irq_uninit(struct erdma_dev *dev)
 166 {
 167         irq_set_affinity_hint(dev->comm_irq.msix_vector, NULL);
 168         free_irq(dev->comm_irq.msix_vector, dev);
 169 }
 170
 171 static int erdma_device_init(struct erdma_dev *dev, struct pci_dev *pdev)
 172 {
 173         int ret;
 174
 175         ret = dma_set_mask_and_coherent(&pdev->dev,
 176                                         DMA_BIT_MASK(ERDMA_PCI_WIDTH));
 177         if (ret)
 178                 return ret;
 179
 180         dma_set_max_seg_size(&pdev->dev, UINT_MAX);
 181
 182         return 0;
 183 }
 184
 185 static void erdma_hw_reset(struct erdma_dev *dev)
 186 {
 187         u32 ctrl = FIELD_PREP(ERDMA_REG_DEV_CTRL_RESET_MASK, 1);
 188
 189         erdma_reg_write32(dev, ERDMA_REGS_DEV_CTRL_REG, ctrl);
 190 }
 191
 192 static int erdma_wait_hw_init_done(struct erdma_dev *dev)
 193 {
 194         int i;
 195
 196         erdma_reg_write32(dev, ERDMA_REGS_DEV_CTRL_REG,
 197                           FIELD_PREP(ERDMA_REG_DEV_CTRL_INIT_MASK, 1));
 198
 199         for (i = 0; i < ERDMA_WAIT_DEV_DONE_CNT; i++) {
 200                 if (erdma_reg_read32_filed(dev, ERDMA_REGS_DEV_ST_REG,
 201                                            ERDMA_REG_DEV_ST_INIT_DONE_MASK))
 202                         break;
 203
 204                 msleep(ERDMA_REG_ACCESS_WAIT_MS);
 205         }
 206
 207         if (i == ERDMA_WAIT_DEV_DONE_CNT) {
 208                 dev_err(&dev->pdev->dev, "wait init done failed.\n");
 209                 return -ETIMEDOUT;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static const struct pci_device_id erdma_pci_tbl[] = {
 216         { PCI_DEVICE(PCI_VENDOR_ID_ALIBABA, 0x107f) },
 217         {}
 218 };
 219
 220 static int erdma_probe_dev(struct pci_dev *pdev)
 221 {
 222         struct erdma_dev *dev;
 223         int bars, err;
 224         u32 version;
 225
 226         err = pci_enable_device(pdev);
 227         if (err) {
 228                 dev_err(&pdev->dev, "pci_enable_device failed(%d)\n", err);
 229                 return err;
 230         }
 231
 232         pci_set_master(pdev);
 233
 234         dev = ib_alloc_device(erdma_dev, ibdev);
 235         if (!dev) {
 236                 dev_err(&pdev->dev, "ib_alloc_device failed\n");
 237                 err = -ENOMEM;
 238                 goto err_disable_device;
 239         }
 240
 241         pci_set_drvdata(pdev, dev);
 242         dev->pdev = pdev;
 243         dev->attrs.numa_node = dev_to_node(&pdev->dev);
 244
 245         bars = pci_select_bars(pdev, IORESOURCE_MEM);
 246         err = pci_request_selected_regions(pdev, bars, DRV_MODULE_NAME);
 247         if (bars != ERDMA_BAR_MASK || err) {
 248                 err = err ? err : -EINVAL;
 249                 goto err_ib_device_release;
 250         }
 251
 252         dev->func_bar_addr = pci_resource_start(pdev, ERDMA_FUNC_BAR);
 253         dev->func_bar_len = pci_resource_len(pdev, ERDMA_FUNC_BAR);
 254
 255         dev->func_bar =
 256                 devm_ioremap(&pdev->dev, dev->func_bar_addr, dev->func_bar_len);
 257         if (!dev->func_bar) {
 258                 dev_err(&pdev->dev, "devm_ioremap failed.\n");
 259                 err = -EFAULT;
 260                 goto err_release_bars;
 261         }
 262
 263         version = erdma_reg_read32(dev, ERDMA_REGS_VERSION_REG);
 264         if (version == 0) {
 265                 /* we knows that it is a non-functional function. */
 266                 err = -ENODEV;
 267                 goto err_iounmap_func_bar;
 268         }
 269
 270         err = erdma_device_init(dev, pdev);
 271         if (err)
 272                 goto err_iounmap_func_bar;
 273
 274         err = erdma_request_vectors(dev);
 275         if (err)
 276                 goto err_iounmap_func_bar;
 277
 278         err = erdma_comm_irq_init(dev);
 279         if (err)
 280                 goto err_free_vectors;
 281
 282         err = erdma_aeq_init(dev);
 283         if (err)
 284                 goto err_uninit_comm_irq;
 285
 286         err = erdma_cmdq_init(dev);
 287         if (err)
 288                 goto err_uninit_aeq;
 289
 290         err = erdma_wait_hw_init_done(dev);
 291         if (err)
 292                 goto err_uninit_cmdq;
 293
 294         err = erdma_ceqs_init(dev);
 295         if (err)
 296                 goto err_reset_hw;
 297
 298         erdma_finish_cmdq_init(dev);
 299
 300         return 0;
 301
 302 err_reset_hw:
 303         erdma_hw_reset(dev);
 304
 305 err_uninit_cmdq:
 306         erdma_cmdq_destroy(dev);
 307
 308 err_uninit_aeq:
 309         erdma_aeq_destroy(dev);
 310
 311 err_uninit_comm_irq:
 312         erdma_comm_irq_uninit(dev);
 313
 314 err_free_vectors:
 315         pci_free_irq_vectors(dev->pdev);
 316
 317 err_iounmap_func_bar:
 318         devm_iounmap(&pdev->dev, dev->func_bar);
 319
 320 err_release_bars:
 321         pci_release_selected_regions(pdev, bars);
 322
 323 err_ib_device_release:
 324         ib_dealloc_device(&dev->ibdev);
 325
 326 err_disable_device:
 327         pci_disable_device(pdev);
 328
 329         return err;
 330 }
 331
 332 static void erdma_remove_dev(struct pci_dev *pdev)
 333 {
 334         struct erdma_dev *dev = pci_get_drvdata(pdev);
 335
 336         erdma_ceqs_uninit(dev);
 337         erdma_hw_reset(dev);
 338         erdma_cmdq_destroy(dev);
 339         erdma_aeq_destroy(dev);
 340         erdma_comm_irq_uninit(dev);
 341         pci_free_irq_vectors(dev->pdev);
 342
 343         devm_iounmap(&pdev->dev, dev->func_bar);
 344         pci_release_selected_regions(pdev, ERDMA_BAR_MASK);
 345
 346         ib_dealloc_device(&dev->ibdev);
 347
 348         pci_disable_device(pdev);
 349 }
 350
 351 #define ERDMA_GET_CAP(name, cap) FIELD_GET(ERDMA_CMD_DEV_CAP_##name##_MASK, cap)
 352
 353 static int erdma_dev_attrs_init(struct erdma_dev *dev)
 354 {
 355         int err;
 356         u64 req_hdr, cap0, cap1;
 357
 358         erdma_cmdq_build_reqhdr(&req_hdr, CMDQ_SUBMOD_RDMA,
 359                                 CMDQ_OPCODE_QUERY_DEVICE);
 360
 361         err = erdma_post_cmd_wait(&dev->cmdq, &req_hdr, sizeof(req_hdr), &cap0,
 362                                   &cap1);
 363         if (err)
 364                 return err;
 365
 366         dev->attrs.max_cqe = 1 << ERDMA_GET_CAP(MAX_CQE, cap0);
 367         dev->attrs.max_mr_size = 1ULL << ERDMA_GET_CAP(MAX_MR_SIZE, cap0);
 368         dev->attrs.max_mw = 1 << ERDMA_GET_CAP(MAX_MW, cap1);
 369         dev->attrs.max_recv_wr = 1 << ERDMA_GET_CAP(MAX_RECV_WR, cap0);
 370         dev->attrs.local_dma_key = ERDMA_GET_CAP(DMA_LOCAL_KEY, cap1);
 371         dev->attrs.cc = ERDMA_GET_CAP(DEFAULT_CC, cap1);
 372         dev->attrs.max_qp = ERDMA_NQP_PER_QBLOCK * ERDMA_GET_CAP(QBLOCK, cap1);
 373         dev->attrs.max_mr = dev->attrs.max_qp << 1;
 374         dev->attrs.max_cq = dev->attrs.max_qp << 1;
 375         dev->attrs.cap_flags = ERDMA_GET_CAP(FLAGS, cap0);
 376
 377         dev->attrs.max_send_wr = ERDMA_MAX_SEND_WR;
 378         dev->attrs.max_ord = ERDMA_MAX_ORD;
 379         dev->attrs.max_ird = ERDMA_MAX_IRD;
 380         dev->attrs.max_send_sge = ERDMA_MAX_SEND_SGE;
 381         dev->attrs.max_recv_sge = ERDMA_MAX_RECV_SGE;
 382         dev->attrs.max_sge_rd = ERDMA_MAX_SGE_RD;
 383         dev->attrs.max_pd = ERDMA_MAX_PD;
 384
 385         dev->res_cb[ERDMA_RES_TYPE_PD].max_cap = ERDMA_MAX_PD;
 386         dev->res_cb[ERDMA_RES_TYPE_STAG_IDX].max_cap = dev->attrs.max_mr;
 387
 388         erdma_cmdq_build_reqhdr(&req_hdr, CMDQ_SUBMOD_COMMON,
 389                                 CMDQ_OPCODE_QUERY_FW_INFO);
 390
 391         err = erdma_post_cmd_wait(&dev->cmdq, &req_hdr, sizeof(req_hdr), &cap0,
 392                                   &cap1);
 393         if (!err)
 394                 dev->attrs.fw_version =
 395                         FIELD_GET(ERDMA_CMD_INFO0_FW_VER_MASK, cap0);
 396
 397         return err;
 398 }
 399
 400 static int erdma_device_config(struct erdma_dev *dev)
 401 {
 402         struct erdma_cmdq_config_device_req req = {};
 403
 404         if (!(dev->attrs.cap_flags & ERDMA_DEV_CAP_FLAGS_EXTEND_DB))
 405                 return 0;
 406
 407         erdma_cmdq_build_reqhdr(&req.hdr, CMDQ_SUBMOD_COMMON,
 408                                 CMDQ_OPCODE_CONF_DEVICE);
 409
 410         req.cfg = FIELD_PREP(ERDMA_CMD_CONFIG_DEVICE_PGSHIFT_MASK, PAGE_SHIFT) |
 411                   FIELD_PREP(ERDMA_CMD_CONFIG_DEVICE_PS_EN_MASK, 1);
 412
 413         return erdma_post_cmd_wait(&dev->cmdq, &req, sizeof(req), NULL, NULL);
 414 }
 415
 416 static int erdma_res_cb_init(struct erdma_dev *dev)
 417 {
 418         int i, j;
 419
 420         for (i = 0; i < ERDMA_RES_CNT; i++) {
 421                 dev->res_cb[i].next_alloc_idx = 1;
 422                 spin_lock_init(&dev->res_cb[i].lock);
 423                 dev->res_cb[i].bitmap =
 424                         bitmap_zalloc(dev->res_cb[i].max_cap, GFP_KERNEL);
 425                 if (!dev->res_cb[i].bitmap)
 426                         goto err;
 427         }
 428
 429         return 0;
 430
 431 err:
 432         for (j = 0; j < i; j++)
 433                 bitmap_free(dev->res_cb[j].bitmap);
 434
 435         return -ENOMEM;
 436 }
 437
 438 static void erdma_res_cb_free(struct erdma_dev *dev)
 439 {
 440         int i;
 441
 442         for (i = 0; i < ERDMA_RES_CNT; i++)
 443                 bitmap_free(dev->res_cb[i].bitmap);
 444 }
 445
 446 static const struct ib_device_ops erdma_device_ops = {
 447         .owner = THIS_MODULE,
 448         .driver_id = RDMA_DRIVER_ERDMA,
 449         .uverbs_abi_ver = ERDMA_ABI_VERSION,
 450
 451         .alloc_mr = erdma_ib_alloc_mr,
 452         .alloc_pd = erdma_alloc_pd,
 453         .alloc_ucontext = erdma_alloc_ucontext,
 454         .create_cq = erdma_create_cq,
 455         .create_qp = erdma_create_qp,
 456         .dealloc_pd = erdma_dealloc_pd,
 457         .dealloc_ucontext = erdma_dealloc_ucontext,
 458         .dereg_mr = erdma_dereg_mr,
 459         .destroy_cq = erdma_destroy_cq,
 460         .destroy_qp = erdma_destroy_qp,
 461         .get_dma_mr = erdma_get_dma_mr,
 462         .get_port_immutable = erdma_get_port_immutable,
 463         .iw_accept = erdma_accept,
 464         .iw_add_ref = erdma_qp_get_ref,
 465         .iw_connect = erdma_connect,
 466         .iw_create_listen = erdma_create_listen,
 467         .iw_destroy_listen = erdma_destroy_listen,
 468         .iw_get_qp = erdma_get_ibqp,
 469         .iw_reject = erdma_reject,
 470         .iw_rem_ref = erdma_qp_put_ref,
 471         .map_mr_sg = erdma_map_mr_sg,
 472         .mmap = erdma_mmap,
 473         .mmap_free = erdma_mmap_free,
 474         .modify_qp = erdma_modify_qp,
 475         .post_recv = erdma_post_recv,
 476         .post_send = erdma_post_send,
 477         .poll_cq = erdma_poll_cq,
 478         .query_device = erdma_query_device,
 479         .query_gid = erdma_query_gid,
 480         .query_port = erdma_query_port,
 481         .query_qp = erdma_query_qp,
 482         .req_notify_cq = erdma_req_notify_cq,
 483         .reg_user_mr = erdma_reg_user_mr,
 484
 485         INIT_RDMA_OBJ_SIZE(ib_cq, erdma_cq, ibcq),
 486         INIT_RDMA_OBJ_SIZE(ib_pd, erdma_pd, ibpd),
 487         INIT_RDMA_OBJ_SIZE(ib_ucontext, erdma_ucontext, ibucontext),
 488         INIT_RDMA_OBJ_SIZE(ib_qp, erdma_qp, ibqp),
 489 };
 490
 491 static int erdma_ib_device_add(struct pci_dev *pdev)
 492 {
 493         struct erdma_dev *dev = pci_get_drvdata(pdev);
 494         struct ib_device *ibdev = &dev->ibdev;
 495         u64 mac;
 496         int ret;
 497
 498         ret = erdma_dev_attrs_init(dev);
 499         if (ret)
 500                 return ret;
 501
 502         ret = erdma_device_config(dev);
 503         if (ret)
 504                 return ret;
 505
 506         ibdev->node_type = RDMA_NODE_RNIC;
 507         memcpy(ibdev->node_desc, ERDMA_NODE_DESC, sizeof(ERDMA_NODE_DESC));
 508
 509         /*
 510          * Current model (one-to-one device association):
 511          * One ERDMA device per net_device or, equivalently,
 512          * per physical port.
 513          */
 514         ibdev->phys_port_cnt = 1;
 515         ibdev->num_comp_vectors = dev->attrs.irq_num - 1;
 516
 517         ib_set_device_ops(ibdev, &erdma_device_ops);
 518
 519         INIT_LIST_HEAD(&dev->cep_list);
 520
 521         spin_lock_init(&dev->lock);
 522         xa_init_flags(&dev->qp_xa, XA_FLAGS_ALLOC1);
 523         xa_init_flags(&dev->cq_xa, XA_FLAGS_ALLOC1);
 524         dev->next_alloc_cqn = 1;
 525         dev->next_alloc_qpn = 1;
 526
 527         ret = erdma_res_cb_init(dev);
 528         if (ret)
 529                 return ret;
 530
 531         atomic_set(&dev->num_ctx, 0);
 532
 533         mac = erdma_reg_read32(dev, ERDMA_REGS_NETDEV_MAC_L_REG);
 534         mac |= (u64)erdma_reg_read32(dev, ERDMA_REGS_NETDEV_MAC_H_REG) << 32;
 535
 536         u64_to_ether_addr(mac, dev->attrs.peer_addr);
 537
 538         dev->reflush_wq = alloc_workqueue("erdma-reflush-wq", WQ_UNBOUND,
 539                                           WQ_UNBOUND_MAX_ACTIVE);
 540         if (!dev->reflush_wq) {
 541                 ret = -ENOMEM;
 542                 goto err_alloc_workqueue;
 543         }
 544
 545         ret = erdma_device_register(dev);
 546         if (ret)
 547                 goto err_register;
 548
 549         return 0;
 550
 551 err_register:
 552         destroy_workqueue(dev->reflush_wq);
 553 err_alloc_workqueue:
 554         xa_destroy(&dev->qp_xa);
 555         xa_destroy(&dev->cq_xa);
 556
 557         erdma_res_cb_free(dev);
 558
 559         return ret;
 560 }
 561
 562 static void erdma_ib_device_remove(struct pci_dev *pdev)
 563 {
 564         struct erdma_dev *dev = pci_get_drvdata(pdev);
 565
 566         unregister_netdevice_notifier(&dev->netdev_nb);
 567         ib_unregister_device(&dev->ibdev);
 568
 569         destroy_workqueue(dev->reflush_wq);
 570         erdma_res_cb_free(dev);
 571         xa_destroy(&dev->qp_xa);
 572         xa_destroy(&dev->cq_xa);
 573 }
 574
 575 static int erdma_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 576 {
 577         int ret;
 578
 579         ret = erdma_probe_dev(pdev);
 580         if (ret)
 581                 return ret;
 582
 583         ret = erdma_ib_device_add(pdev);
 584         if (ret) {
 585                 erdma_remove_dev(pdev);
 586                 return ret;
 587         }
 588
 589         return 0;
 590 }
 591
 592 static void erdma_remove(struct pci_dev *pdev)
 593 {
 594         erdma_ib_device_remove(pdev);
 595         erdma_remove_dev(pdev);
 596 }
 597
 598 static struct pci_driver erdma_pci_driver = {
 599         .name = DRV_MODULE_NAME,
 600         .id_table = erdma_pci_tbl,
 601         .probe = erdma_probe,
 602         .remove = erdma_remove
 603 };
 604
 605 MODULE_DEVICE_TABLE(pci, erdma_pci_tbl);
 606
 607 static __init int erdma_init_module(void)
 608 {
 609         int ret;
 610
 611         ret = erdma_cm_init();
 612         if (ret)
 613                 return ret;
 614
 615         ret = pci_register_driver(&erdma_pci_driver);
 616         if (ret)
 617                 erdma_cm_exit();
 618
 619         return ret;
 620 }
 621
 622 static void __exit erdma_exit_module(void)
 623 {
 624         pci_unregister_driver(&erdma_pci_driver);
 625
 626         erdma_cm_exit();
 627 }
 628
 629 module_init(erdma_init_module);
 630 module_exit(erdma_exit_module);