drivers/infiniband/hw/ocrdma/ocrdma_main.c

   1 /*******************************************************************
   2  * This file is part of the Emulex RoCE Device Driver for          *
   3  * RoCE (RDMA over Converged Ethernet) adapters.                   *
   4  * Copyright (C) 2008-2012 Emulex. All rights reserved.            *
   5  * EMULEX and SLI are trademarks of Emulex.                        *
   6  * www.emulex.com                                                  *
   7  *                                                                 *
   8  * This program is free software; you can redistribute it and/or   *
   9  * modify it under the terms of version 2 of the GNU General       *
  10  * Public License as published by the Free Software Foundation.    *
  11  * This program is distributed in the hope that it will be useful. *
  12  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  13  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  14  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  15  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  16  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  17  * more details, a copy of which can be found in the file COPYING  *
  18  * included with this package.                                     *
  19  *
  20  * Contact Information:
  21  * linux-drivers@emulex.com
  22  *
  23  * Emulex
  24  * 3333 Susan Street
  25  * Costa Mesa, CA 92626
  26  *******************************************************************/
  27
  28 #include <linux/module.h>
  29 #include <linux/idr.h>
  30 #include <rdma/ib_verbs.h>
  31 #include <rdma/ib_user_verbs.h>
  32 #include <rdma/ib_addr.h>
  33
  34 #include <linux/netdevice.h>
  35 #include <net/addrconf.h>
  36
  37 #include "ocrdma.h"
  38 #include "ocrdma_verbs.h"
  39 #include "ocrdma_ah.h"
  40 #include "be_roce.h"
  41 #include "ocrdma_hw.h"
  42
  43 MODULE_VERSION(OCRDMA_ROCE_DEV_VERSION);
  44 MODULE_DESCRIPTION("Emulex RoCE HCA Driver");
  45 MODULE_AUTHOR("Emulex Corporation");
  46 MODULE_LICENSE("GPL");
  47
  48 static LIST_HEAD(ocrdma_dev_list);
  49 static DEFINE_SPINLOCK(ocrdma_devlist_lock);
  50 static DEFINE_IDR(ocrdma_dev_id);
  51
  52 static union ib_gid ocrdma_zero_sgid;
  53
  54 void ocrdma_get_guid(struct ocrdma_dev *dev, u8 *guid)
  55 {
  56         u8 mac_addr[6];
  57
  58         memcpy(&mac_addr[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
  59         guid[0] = mac_addr[0] ^ 2;
  60         guid[1] = mac_addr[1];
  61         guid[2] = mac_addr[2];
  62         guid[3] = 0xff;
  63         guid[4] = 0xfe;
  64         guid[5] = mac_addr[3];
  65         guid[6] = mac_addr[4];
  66         guid[7] = mac_addr[5];
  67 }
  68
  69 static void ocrdma_build_sgid_mac(union ib_gid *sgid, unsigned char *mac_addr,
  70                                   bool is_vlan, u16 vlan_id)
  71 {
  72         sgid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
  73         sgid->raw[8] = mac_addr[0] ^ 2;
  74         sgid->raw[9] = mac_addr[1];
  75         sgid->raw[10] = mac_addr[2];
  76         if (is_vlan) {
  77                 sgid->raw[11] = vlan_id >> 8;
  78                 sgid->raw[12] = vlan_id & 0xff;
  79         } else {
  80                 sgid->raw[11] = 0xff;
  81                 sgid->raw[12] = 0xfe;
  82         }
  83         sgid->raw[13] = mac_addr[3];
  84         sgid->raw[14] = mac_addr[4];
  85         sgid->raw[15] = mac_addr[5];
  86 }
  87
  88 static bool ocrdma_add_sgid(struct ocrdma_dev *dev, unsigned char *mac_addr,
  89                             bool is_vlan, u16 vlan_id)
  90 {
  91         int i;
  92         union ib_gid new_sgid;
  93         unsigned long flags;
  94
  95         memset(&ocrdma_zero_sgid, 0, sizeof(union ib_gid));
  96
  97         ocrdma_build_sgid_mac(&new_sgid, mac_addr, is_vlan, vlan_id);
  98
  99         spin_lock_irqsave(&dev->sgid_lock, flags);
 100         for (i = 0; i < OCRDMA_MAX_SGID; i++) {
 101                 if (!memcmp(&dev->sgid_tbl[i], &ocrdma_zero_sgid,
 102                             sizeof(union ib_gid))) {
 103                         /* found free entry */
 104                         memcpy(&dev->sgid_tbl[i], &new_sgid,
 105                                sizeof(union ib_gid));
 106                         spin_unlock_irqrestore(&dev->sgid_lock, flags);
 107                         return true;
 108                 } else if (!memcmp(&dev->sgid_tbl[i], &new_sgid,
 109                                    sizeof(union ib_gid))) {
 110                         /* entry already present, no addition is required. */
 111                         spin_unlock_irqrestore(&dev->sgid_lock, flags);
 112                         return false;
 113                 }
 114         }
 115         spin_unlock_irqrestore(&dev->sgid_lock, flags);
 116         return false;
 117 }
 118
 119 static bool ocrdma_del_sgid(struct ocrdma_dev *dev, unsigned char *mac_addr,
 120                             bool is_vlan, u16 vlan_id)
 121 {
 122         int found = false;
 123         int i;
 124         union ib_gid sgid;
 125         unsigned long flags;
 126
 127         ocrdma_build_sgid_mac(&sgid, mac_addr, is_vlan, vlan_id);
 128
 129         spin_lock_irqsave(&dev->sgid_lock, flags);
 130         /* first is default sgid, which cannot be deleted. */
 131         for (i = 1; i < OCRDMA_MAX_SGID; i++) {
 132                 if (!memcmp(&dev->sgid_tbl[i], &sgid, sizeof(union ib_gid))) {
 133                         /* found matching entry */
 134                         memset(&dev->sgid_tbl[i], 0, sizeof(union ib_gid));
 135                         found = true;
 136                         break;
 137                 }
 138         }
 139         spin_unlock_irqrestore(&dev->sgid_lock, flags);
 140         return found;
 141 }
 142
 143 static void ocrdma_add_default_sgid(struct ocrdma_dev *dev)
 144 {
 145         /* GID Index 0 - Invariant manufacturer-assigned EUI-64 */
 146         union ib_gid *sgid = &dev->sgid_tbl[0];
 147
 148         sgid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
 149         ocrdma_get_guid(dev, &sgid->raw[8]);
 150 }
 151
 152 #if IS_ENABLED(CONFIG_VLAN_8021Q)
 153 static void ocrdma_add_vlan_sgids(struct ocrdma_dev *dev)
 154 {
 155         struct net_device *netdev, *tmp;
 156         u16 vlan_id;
 157         bool is_vlan;
 158
 159         netdev = dev->nic_info.netdev;
 160
 161         rcu_read_lock();
 162         for_each_netdev_rcu(&init_net, tmp) {
 163                 if (netdev == tmp || vlan_dev_real_dev(tmp) == netdev) {
 164                         if (!netif_running(tmp) || !netif_oper_up(tmp))
 165                                 continue;
 166                         if (netdev != tmp) {
 167                                 vlan_id = vlan_dev_vlan_id(tmp);
 168                                 is_vlan = true;
 169                         } else {
 170                                 is_vlan = false;
 171                                 vlan_id = 0;
 172                                 tmp = netdev;
 173                         }
 174                         ocrdma_add_sgid(dev, tmp->dev_addr, is_vlan, vlan_id);
 175                 }
 176         }
 177         rcu_read_unlock();
 178 }
 179 #else
 180 static void ocrdma_add_vlan_sgids(struct ocrdma_dev *dev)
 181 {
 182
 183 }
 184 #endif /* VLAN */
 185
 186 static int ocrdma_build_sgid_tbl(struct ocrdma_dev *dev)
 187 {
 188         ocrdma_add_default_sgid(dev);
 189         ocrdma_add_vlan_sgids(dev);
 190         return 0;
 191 }
 192
 193 #if IS_ENABLED(CONFIG_IPV6)
 194
 195 static int ocrdma_inet6addr_event(struct notifier_block *notifier,
 196                                   unsigned long event, void *ptr)
 197 {
 198         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
 199         struct net_device *netdev = ifa->idev->dev;
 200         struct ib_event gid_event;
 201         struct ocrdma_dev *dev;
 202         bool found = false;
 203         bool updated = false;
 204         bool is_vlan = false;
 205         u16 vid = 0;
 206
 207         is_vlan = netdev->priv_flags & IFF_802_1Q_VLAN;
 208         if (is_vlan) {
 209                 vid = vlan_dev_vlan_id(netdev);
 210                 netdev = vlan_dev_real_dev(netdev);
 211         }
 212
 213         rcu_read_lock();
 214         list_for_each_entry_rcu(dev, &ocrdma_dev_list, entry) {
 215                 if (dev->nic_info.netdev == netdev) {
 216                         found = true;
 217                         break;
 218                 }
 219         }
 220         rcu_read_unlock();
 221
 222         if (!found)
 223                 return NOTIFY_DONE;
 224         if (!rdma_link_local_addr((struct in6_addr *)&ifa->addr))
 225                 return NOTIFY_DONE;
 226
 227         mutex_lock(&dev->dev_lock);
 228         switch (event) {
 229         case NETDEV_UP:
 230                 updated = ocrdma_add_sgid(dev, netdev->dev_addr, is_vlan, vid);
 231                 break;
 232         case NETDEV_DOWN:
 233                 updated = ocrdma_del_sgid(dev, netdev->dev_addr, is_vlan, vid);
 234                 break;
 235         default:
 236                 break;
 237         }
 238         if (updated) {
 239                 /* GID table updated, notify the consumers about it */
 240                 gid_event.device = &dev->ibdev;
 241                 gid_event.element.port_num = 1;
 242                 gid_event.event = IB_EVENT_GID_CHANGE;
 243                 ib_dispatch_event(&gid_event);
 244         }
 245         mutex_unlock(&dev->dev_lock);
 246         return NOTIFY_OK;
 247 }
 248
 249 static struct notifier_block ocrdma_inet6addr_notifier = {
 250         .notifier_call = ocrdma_inet6addr_event
 251 };
 252
 253 #endif /* IPV6 and VLAN */
 254
 255 static enum rdma_link_layer ocrdma_link_layer(struct ib_device *device,
 256                                               u8 port_num)
 257 {
 258         return IB_LINK_LAYER_ETHERNET;
 259 }
 260
 261 static int ocrdma_register_device(struct ocrdma_dev *dev)
 262 {
 263         strlcpy(dev->ibdev.name, "ocrdma%d", IB_DEVICE_NAME_MAX);
 264         ocrdma_get_guid(dev, (u8 *)&dev->ibdev.node_guid);
 265         memcpy(dev->ibdev.node_desc, OCRDMA_NODE_DESC,
 266                sizeof(OCRDMA_NODE_DESC));
 267         dev->ibdev.owner = THIS_MODULE;
 268         dev->ibdev.uverbs_cmd_mask =
 269             OCRDMA_UVERBS(GET_CONTEXT) |
 270             OCRDMA_UVERBS(QUERY_DEVICE) |
 271             OCRDMA_UVERBS(QUERY_PORT) |
 272             OCRDMA_UVERBS(ALLOC_PD) |
 273             OCRDMA_UVERBS(DEALLOC_PD) |
 274             OCRDMA_UVERBS(REG_MR) |
 275             OCRDMA_UVERBS(DEREG_MR) |
 276             OCRDMA_UVERBS(CREATE_COMP_CHANNEL) |
 277             OCRDMA_UVERBS(CREATE_CQ) |
 278             OCRDMA_UVERBS(RESIZE_CQ) |
 279             OCRDMA_UVERBS(DESTROY_CQ) |
 280             OCRDMA_UVERBS(REQ_NOTIFY_CQ) |
 281             OCRDMA_UVERBS(CREATE_QP) |
 282             OCRDMA_UVERBS(MODIFY_QP) |
 283             OCRDMA_UVERBS(QUERY_QP) |
 284             OCRDMA_UVERBS(DESTROY_QP) |
 285             OCRDMA_UVERBS(POLL_CQ) |
 286             OCRDMA_UVERBS(POST_SEND) |
 287             OCRDMA_UVERBS(POST_RECV);
 288
 289         dev->ibdev.uverbs_cmd_mask |=
 290             OCRDMA_UVERBS(CREATE_AH) |
 291              OCRDMA_UVERBS(MODIFY_AH) |
 292              OCRDMA_UVERBS(QUERY_AH) |
 293              OCRDMA_UVERBS(DESTROY_AH);
 294
 295         dev->ibdev.node_type = RDMA_NODE_IB_CA;
 296         dev->ibdev.phys_port_cnt = 1;
 297         dev->ibdev.num_comp_vectors = 1;
 298
 299         /* mandatory verbs. */
 300         dev->ibdev.query_device = ocrdma_query_device;
 301         dev->ibdev.query_port = ocrdma_query_port;
 302         dev->ibdev.modify_port = ocrdma_modify_port;
 303         dev->ibdev.query_gid = ocrdma_query_gid;
 304         dev->ibdev.get_link_layer = ocrdma_link_layer;
 305         dev->ibdev.alloc_pd = ocrdma_alloc_pd;
 306         dev->ibdev.dealloc_pd = ocrdma_dealloc_pd;
 307
 308         dev->ibdev.create_cq = ocrdma_create_cq;
 309         dev->ibdev.destroy_cq = ocrdma_destroy_cq;
 310         dev->ibdev.resize_cq = ocrdma_resize_cq;
 311
 312         dev->ibdev.create_qp = ocrdma_create_qp;
 313         dev->ibdev.modify_qp = ocrdma_modify_qp;
 314         dev->ibdev.query_qp = ocrdma_query_qp;
 315         dev->ibdev.destroy_qp = ocrdma_destroy_qp;
 316
 317         dev->ibdev.query_pkey = ocrdma_query_pkey;
 318         dev->ibdev.create_ah = ocrdma_create_ah;
 319         dev->ibdev.destroy_ah = ocrdma_destroy_ah;
 320         dev->ibdev.query_ah = ocrdma_query_ah;
 321         dev->ibdev.modify_ah = ocrdma_modify_ah;
 322
 323         dev->ibdev.poll_cq = ocrdma_poll_cq;
 324         dev->ibdev.post_send = ocrdma_post_send;
 325         dev->ibdev.post_recv = ocrdma_post_recv;
 326         dev->ibdev.req_notify_cq = ocrdma_arm_cq;
 327
 328         dev->ibdev.get_dma_mr = ocrdma_get_dma_mr;
 329         dev->ibdev.dereg_mr = ocrdma_dereg_mr;
 330         dev->ibdev.reg_user_mr = ocrdma_reg_user_mr;
 331
 332         /* mandatory to support user space verbs consumer. */
 333         dev->ibdev.alloc_ucontext = ocrdma_alloc_ucontext;
 334         dev->ibdev.dealloc_ucontext = ocrdma_dealloc_ucontext;
 335         dev->ibdev.mmap = ocrdma_mmap;
 336         dev->ibdev.dma_device = &dev->nic_info.pdev->dev;
 337
 338         dev->ibdev.process_mad = ocrdma_process_mad;
 339
 340         if (dev->nic_info.dev_family == OCRDMA_GEN2_FAMILY) {
 341                 dev->ibdev.uverbs_cmd_mask |=
 342                      OCRDMA_UVERBS(CREATE_SRQ) |
 343                      OCRDMA_UVERBS(MODIFY_SRQ) |
 344                      OCRDMA_UVERBS(QUERY_SRQ) |
 345                      OCRDMA_UVERBS(DESTROY_SRQ) |
 346                      OCRDMA_UVERBS(POST_SRQ_RECV);
 347
 348                 dev->ibdev.create_srq = ocrdma_create_srq;
 349                 dev->ibdev.modify_srq = ocrdma_modify_srq;
 350                 dev->ibdev.query_srq = ocrdma_query_srq;
 351                 dev->ibdev.destroy_srq = ocrdma_destroy_srq;
 352                 dev->ibdev.post_srq_recv = ocrdma_post_srq_recv;
 353         }
 354         return ib_register_device(&dev->ibdev, NULL);
 355 }
 356
 357 static int ocrdma_alloc_resources(struct ocrdma_dev *dev)
 358 {
 359         mutex_init(&dev->dev_lock);
 360         dev->sgid_tbl = kzalloc(sizeof(union ib_gid) *
 361                                 OCRDMA_MAX_SGID, GFP_KERNEL);
 362         if (!dev->sgid_tbl)
 363                 goto alloc_err;
 364         spin_lock_init(&dev->sgid_lock);
 365
 366         dev->cq_tbl = kzalloc(sizeof(struct ocrdma_cq *) *
 367                               OCRDMA_MAX_CQ, GFP_KERNEL);
 368         if (!dev->cq_tbl)
 369                 goto alloc_err;
 370
 371         if (dev->attr.max_qp) {
 372                 dev->qp_tbl = kzalloc(sizeof(struct ocrdma_qp *) *
 373                                       OCRDMA_MAX_QP, GFP_KERNEL);
 374                 if (!dev->qp_tbl)
 375                         goto alloc_err;
 376         }
 377         spin_lock_init(&dev->av_tbl.lock);
 378         spin_lock_init(&dev->flush_q_lock);
 379         return 0;
 380 alloc_err:
 381         ocrdma_err("%s(%d) error.\n", __func__, dev->id);
 382         return -ENOMEM;
 383 }
 384
 385 static void ocrdma_free_resources(struct ocrdma_dev *dev)
 386 {
 387         kfree(dev->qp_tbl);
 388         kfree(dev->cq_tbl);
 389         kfree(dev->sgid_tbl);
 390 }
 391
 392 static struct ocrdma_dev *ocrdma_add(struct be_dev_info *dev_info)
 393 {
 394         int status = 0;
 395         struct ocrdma_dev *dev;
 396
 397         dev = (struct ocrdma_dev *)ib_alloc_device(sizeof(struct ocrdma_dev));
 398         if (!dev) {
 399                 ocrdma_err("Unable to allocate ib device\n");
 400                 return NULL;
 401         }
 402         dev->mbx_cmd = kzalloc(sizeof(struct ocrdma_mqe_emb_cmd), GFP_KERNEL);
 403         if (!dev->mbx_cmd)
 404                 goto idr_err;
 405
 406         memcpy(&dev->nic_info, dev_info, sizeof(*dev_info));
 407         dev->id = idr_alloc(&ocrdma_dev_id, NULL, 0, 0, GFP_KERNEL);
 408         if (dev->id < 0)
 409                 goto idr_err;
 410
 411         status = ocrdma_init_hw(dev);
 412         if (status)
 413                 goto init_err;
 414
 415         status = ocrdma_alloc_resources(dev);
 416         if (status)
 417                 goto alloc_err;
 418
 419         status = ocrdma_build_sgid_tbl(dev);
 420         if (status)
 421                 goto alloc_err;
 422
 423         status = ocrdma_register_device(dev);
 424         if (status)
 425                 goto alloc_err;
 426
 427         spin_lock(&ocrdma_devlist_lock);
 428         list_add_tail_rcu(&dev->entry, &ocrdma_dev_list);
 429         spin_unlock(&ocrdma_devlist_lock);
 430         return dev;
 431
 432 alloc_err:
 433         ocrdma_free_resources(dev);
 434         ocrdma_cleanup_hw(dev);
 435 init_err:
 436         idr_remove(&ocrdma_dev_id, dev->id);
 437 idr_err:
 438         kfree(dev->mbx_cmd);
 439         ib_dealloc_device(&dev->ibdev);
 440         ocrdma_err("%s() leaving. ret=%d\n", __func__, status);
 441         return NULL;
 442 }
 443
 444 static void ocrdma_remove_free(struct rcu_head *rcu)
 445 {
 446         struct ocrdma_dev *dev = container_of(rcu, struct ocrdma_dev, rcu);
 447
 448         ocrdma_free_resources(dev);
 449         ocrdma_cleanup_hw(dev);
 450
 451         idr_remove(&ocrdma_dev_id, dev->id);
 452         kfree(dev->mbx_cmd);
 453         ib_dealloc_device(&dev->ibdev);
 454 }
 455
 456 static void ocrdma_remove(struct ocrdma_dev *dev)
 457 {
 458         /* first unregister with stack to stop all the active traffic
 459          * of the registered clients.
 460          */
 461         ib_unregister_device(&dev->ibdev);
 462
 463         spin_lock(&ocrdma_devlist_lock);
 464         list_del_rcu(&dev->entry);
 465         spin_unlock(&ocrdma_devlist_lock);
 466         call_rcu(&dev->rcu, ocrdma_remove_free);
 467 }
 468
 469 static int ocrdma_open(struct ocrdma_dev *dev)
 470 {
 471         struct ib_event port_event;
 472
 473         port_event.event = IB_EVENT_PORT_ACTIVE;
 474         port_event.element.port_num = 1;
 475         port_event.device = &dev->ibdev;
 476         ib_dispatch_event(&port_event);
 477         return 0;
 478 }
 479
 480 static int ocrdma_close(struct ocrdma_dev *dev)
 481 {
 482         int i;
 483         struct ocrdma_qp *qp, **cur_qp;
 484         struct ib_event err_event;
 485         struct ib_qp_attr attrs;
 486         int attr_mask = IB_QP_STATE;
 487
 488         attrs.qp_state = IB_QPS_ERR;
 489         mutex_lock(&dev->dev_lock);
 490         if (dev->qp_tbl) {
 491                 cur_qp = dev->qp_tbl;
 492                 for (i = 0; i < OCRDMA_MAX_QP; i++) {
 493                         qp = cur_qp[i];
 494                         if (qp) {
 495                                 /* change the QP state to ERROR */
 496                                 _ocrdma_modify_qp(&qp->ibqp, &attrs, attr_mask);
 497
 498                                 err_event.event = IB_EVENT_QP_FATAL;
 499                                 err_event.element.qp = &qp->ibqp;
 500                                 err_event.device = &dev->ibdev;
 501                                 ib_dispatch_event(&err_event);
 502                         }
 503                 }
 504         }
 505         mutex_unlock(&dev->dev_lock);
 506
 507         err_event.event = IB_EVENT_PORT_ERR;
 508         err_event.element.port_num = 1;
 509         err_event.device = &dev->ibdev;
 510         ib_dispatch_event(&err_event);
 511         return 0;
 512 }
 513
 514 /* event handling via NIC driver ensures that all the NIC specific
 515  * initialization done before RoCE driver notifies
 516  * event to stack.
 517  */
 518 static void ocrdma_event_handler(struct ocrdma_dev *dev, u32 event)
 519 {
 520         switch (event) {
 521         case BE_DEV_UP:
 522                 ocrdma_open(dev);
 523                 break;
 524         case BE_DEV_DOWN:
 525                 ocrdma_close(dev);
 526                 break;
 527         };
 528 }
 529
 530 static struct ocrdma_driver ocrdma_drv = {
 531         .name                   = "ocrdma_driver",
 532         .add                    = ocrdma_add,
 533         .remove                 = ocrdma_remove,
 534         .state_change_handler   = ocrdma_event_handler,
 535 };
 536
 537 static void ocrdma_unregister_inet6addr_notifier(void)
 538 {
 539 #if IS_ENABLED(CONFIG_IPV6)
 540         unregister_inet6addr_notifier(&ocrdma_inet6addr_notifier);
 541 #endif
 542 }
 543
 544 static int __init ocrdma_init_module(void)
 545 {
 546         int status;
 547
 548 #if IS_ENABLED(CONFIG_IPV6)
 549         status = register_inet6addr_notifier(&ocrdma_inet6addr_notifier);
 550         if (status)
 551                 return status;
 552 #endif
 553
 554         status = be_roce_register_driver(&ocrdma_drv);
 555         if (status)
 556                 ocrdma_unregister_inet6addr_notifier();
 557
 558         return status;
 559 }
 560
 561 static void __exit ocrdma_exit_module(void)
 562 {
 563         be_roce_unregister_driver(&ocrdma_drv);
 564         ocrdma_unregister_inet6addr_notifier();
 565 }
 566
 567 module_init(ocrdma_init_module);
 568 module_exit(ocrdma_exit_module);