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 static int ocrdma_get_instance(void)
  55 {
  56         int instance = 0;
  57
  58         /* Assign an unused number */
  59         if (!idr_pre_get(&ocrdma_dev_id, GFP_KERNEL))
  60                 return -1;
  61         if (idr_get_new(&ocrdma_dev_id, NULL, &instance))
  62                 return -1;
  63         return instance;
  64 }
  65
  66 void ocrdma_get_guid(struct ocrdma_dev *dev, u8 *guid)
  67 {
  68         u8 mac_addr[6];
  69
  70         memcpy(&mac_addr[0], &dev->nic_info.mac_addr[0], ETH_ALEN);
  71         guid[0] = mac_addr[0] ^ 2;
  72         guid[1] = mac_addr[1];
  73         guid[2] = mac_addr[2];
  74         guid[3] = 0xff;
  75         guid[4] = 0xfe;
  76         guid[5] = mac_addr[3];
  77         guid[6] = mac_addr[4];
  78         guid[7] = mac_addr[5];
  79 }
  80
  81 static void ocrdma_build_sgid_mac(union ib_gid *sgid, unsigned char *mac_addr,
  82                                   bool is_vlan, u16 vlan_id)
  83 {
  84         sgid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
  85         sgid->raw[8] = mac_addr[0] ^ 2;
  86         sgid->raw[9] = mac_addr[1];
  87         sgid->raw[10] = mac_addr[2];
  88         if (is_vlan) {
  89                 sgid->raw[11] = vlan_id >> 8;
  90                 sgid->raw[12] = vlan_id & 0xff;
  91         } else {
  92                 sgid->raw[11] = 0xff;
  93                 sgid->raw[12] = 0xfe;
  94         }
  95         sgid->raw[13] = mac_addr[3];
  96         sgid->raw[14] = mac_addr[4];
  97         sgid->raw[15] = mac_addr[5];
  98 }
  99
 100 static void ocrdma_add_sgid(struct ocrdma_dev *dev, unsigned char *mac_addr,
 101                             bool is_vlan, u16 vlan_id)
 102 {
 103         int i;
 104         bool found = false;
 105         union ib_gid new_sgid;
 106         int free_idx = OCRDMA_MAX_SGID;
 107         unsigned long flags;
 108
 109         memset(&ocrdma_zero_sgid, 0, sizeof(union ib_gid));
 110
 111         ocrdma_build_sgid_mac(&new_sgid, mac_addr, is_vlan, vlan_id);
 112
 113         spin_lock_irqsave(&dev->sgid_lock, flags);
 114         for (i = 0; i < OCRDMA_MAX_SGID; i++) {
 115                 if (!memcmp(&dev->sgid_tbl[i], &ocrdma_zero_sgid,
 116                             sizeof(union ib_gid))) {
 117                         /* found free entry */
 118                         if (!found) {
 119                                 free_idx = i;
 120                                 found = true;
 121                                 break;
 122                         }
 123                 } else if (!memcmp(&dev->sgid_tbl[i], &new_sgid,
 124                                    sizeof(union ib_gid))) {
 125                         /* entry already present, no addition is required. */
 126                         spin_unlock_irqrestore(&dev->sgid_lock, flags);
 127                         return;
 128                 }
 129         }
 130         /* if entry doesn't exist and if table has some space, add entry */
 131         if (found)
 132                 memcpy(&dev->sgid_tbl[free_idx], &new_sgid,
 133                        sizeof(union ib_gid));
 134         spin_unlock_irqrestore(&dev->sgid_lock, flags);
 135 }
 136
 137 static bool ocrdma_del_sgid(struct ocrdma_dev *dev, unsigned char *mac_addr,
 138                             bool is_vlan, u16 vlan_id)
 139 {
 140         int found = false;
 141         int i;
 142         union ib_gid sgid;
 143         unsigned long flags;
 144
 145         ocrdma_build_sgid_mac(&sgid, mac_addr, is_vlan, vlan_id);
 146
 147         spin_lock_irqsave(&dev->sgid_lock, flags);
 148         /* first is default sgid, which cannot be deleted. */
 149         for (i = 1; i < OCRDMA_MAX_SGID; i++) {
 150                 if (!memcmp(&dev->sgid_tbl[i], &sgid, sizeof(union ib_gid))) {
 151                         /* found matching entry */
 152                         memset(&dev->sgid_tbl[i], 0, sizeof(union ib_gid));
 153                         found = true;
 154                         break;
 155                 }
 156         }
 157         spin_unlock_irqrestore(&dev->sgid_lock, flags);
 158         return found;
 159 }
 160
 161 static void ocrdma_add_default_sgid(struct ocrdma_dev *dev)
 162 {
 163         /* GID Index 0 - Invariant manufacturer-assigned EUI-64 */
 164         union ib_gid *sgid = &dev->sgid_tbl[0];
 165
 166         sgid->global.subnet_prefix = cpu_to_be64(0xfe80000000000000LL);
 167         ocrdma_get_guid(dev, &sgid->raw[8]);
 168 }
 169
 170 static int ocrdma_build_sgid_tbl(struct ocrdma_dev *dev)
 171 {
 172         struct net_device *netdev, *tmp;
 173         u16 vlan_id;
 174         bool is_vlan;
 175
 176         netdev = dev->nic_info.netdev;
 177
 178         ocrdma_add_default_sgid(dev);
 179
 180         rcu_read_lock();
 181         for_each_netdev_rcu(&init_net, tmp) {
 182                 if (netdev == tmp || vlan_dev_real_dev(tmp) == netdev) {
 183                         if (!netif_running(tmp) || !netif_oper_up(tmp))
 184                                 continue;
 185                         if (netdev != tmp) {
 186                                 vlan_id = vlan_dev_vlan_id(tmp);
 187                                 is_vlan = true;
 188                         } else {
 189                                 is_vlan = false;
 190                                 vlan_id = 0;
 191                                 tmp = netdev;
 192                         }
 193                         ocrdma_add_sgid(dev, tmp->dev_addr, is_vlan, vlan_id);
 194                 }
 195         }
 196         rcu_read_unlock();
 197         return 0;
 198 }
 199
 200 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 201
 202 static int ocrdma_inet6addr_event(struct notifier_block *notifier,
 203                                   unsigned long event, void *ptr)
 204 {
 205         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
 206         struct net_device *event_netdev = ifa->idev->dev;
 207         struct net_device *netdev = NULL;
 208         struct ib_event gid_event;
 209         struct ocrdma_dev *dev;
 210         bool found = false;
 211         bool is_vlan = false;
 212         u16 vid = 0;
 213
 214         netdev = vlan_dev_real_dev(event_netdev);
 215         if (netdev != event_netdev) {
 216                 is_vlan = true;
 217                 vid = vlan_dev_vlan_id(event_netdev);
 218         }
 219         rcu_read_lock();
 220         list_for_each_entry_rcu(dev, &ocrdma_dev_list, entry) {
 221                 if (dev->nic_info.netdev == netdev) {
 222                         found = true;
 223                         break;
 224                 }
 225         }
 226         rcu_read_unlock();
 227
 228         if (!found)
 229                 return NOTIFY_DONE;
 230         if (!rdma_link_local_addr((struct in6_addr *)&ifa->addr))
 231                 return NOTIFY_DONE;
 232
 233         mutex_lock(&dev->dev_lock);
 234         switch (event) {
 235         case NETDEV_UP:
 236                 ocrdma_add_sgid(dev, netdev->dev_addr, is_vlan, vid);
 237                 break;
 238         case NETDEV_DOWN:
 239                 found = ocrdma_del_sgid(dev, netdev->dev_addr, is_vlan, vid);
 240                 if (found) {
 241                         /* found the matching entry, notify
 242                          * the consumers about it
 243                          */
 244                         gid_event.device = &dev->ibdev;
 245                         gid_event.element.port_num = 1;
 246                         gid_event.event = IB_EVENT_GID_CHANGE;
 247                         ib_dispatch_event(&gid_event);
 248                 }
 249                 break;
 250         default:
 251                 break;
 252         }
 253         mutex_unlock(&dev->dev_lock);
 254         return NOTIFY_OK;
 255 }
 256
 257 static struct notifier_block ocrdma_inet6addr_notifier = {
 258         .notifier_call = ocrdma_inet6addr_event
 259 };
 260
 261 #endif /* IPV6 */
 262
 263 static enum rdma_link_layer ocrdma_link_layer(struct ib_device *device,
 264                                               u8 port_num)
 265 {
 266         return IB_LINK_LAYER_ETHERNET;
 267 }
 268
 269 static int ocrdma_register_device(struct ocrdma_dev *dev)
 270 {
 271         strlcpy(dev->ibdev.name, "ocrdma%d", IB_DEVICE_NAME_MAX);
 272         ocrdma_get_guid(dev, (u8 *)&dev->ibdev.node_guid);
 273         memcpy(dev->ibdev.node_desc, OCRDMA_NODE_DESC,
 274                sizeof(OCRDMA_NODE_DESC));
 275         dev->ibdev.owner = THIS_MODULE;
 276         dev->ibdev.uverbs_cmd_mask =
 277             OCRDMA_UVERBS(GET_CONTEXT) |
 278             OCRDMA_UVERBS(QUERY_DEVICE) |
 279             OCRDMA_UVERBS(QUERY_PORT) |
 280             OCRDMA_UVERBS(ALLOC_PD) |
 281             OCRDMA_UVERBS(DEALLOC_PD) |
 282             OCRDMA_UVERBS(REG_MR) |
 283             OCRDMA_UVERBS(DEREG_MR) |
 284             OCRDMA_UVERBS(CREATE_COMP_CHANNEL) |
 285             OCRDMA_UVERBS(CREATE_CQ) |
 286             OCRDMA_UVERBS(RESIZE_CQ) |
 287             OCRDMA_UVERBS(DESTROY_CQ) |
 288             OCRDMA_UVERBS(REQ_NOTIFY_CQ) |
 289             OCRDMA_UVERBS(CREATE_QP) |
 290             OCRDMA_UVERBS(MODIFY_QP) |
 291             OCRDMA_UVERBS(QUERY_QP) |
 292             OCRDMA_UVERBS(DESTROY_QP) |
 293             OCRDMA_UVERBS(POLL_CQ) |
 294             OCRDMA_UVERBS(POST_SEND) |
 295             OCRDMA_UVERBS(POST_RECV);
 296
 297         dev->ibdev.uverbs_cmd_mask |=
 298             OCRDMA_UVERBS(CREATE_AH) |
 299              OCRDMA_UVERBS(MODIFY_AH) |
 300              OCRDMA_UVERBS(QUERY_AH) |
 301              OCRDMA_UVERBS(DESTROY_AH);
 302
 303         dev->ibdev.node_type = RDMA_NODE_IB_CA;
 304         dev->ibdev.phys_port_cnt = 1;
 305         dev->ibdev.num_comp_vectors = 1;
 306
 307         /* mandatory verbs. */
 308         dev->ibdev.query_device = ocrdma_query_device;
 309         dev->ibdev.query_port = ocrdma_query_port;
 310         dev->ibdev.modify_port = ocrdma_modify_port;
 311         dev->ibdev.query_gid = ocrdma_query_gid;
 312         dev->ibdev.get_link_layer = ocrdma_link_layer;
 313         dev->ibdev.alloc_pd = ocrdma_alloc_pd;
 314         dev->ibdev.dealloc_pd = ocrdma_dealloc_pd;
 315
 316         dev->ibdev.create_cq = ocrdma_create_cq;
 317         dev->ibdev.destroy_cq = ocrdma_destroy_cq;
 318         dev->ibdev.resize_cq = ocrdma_resize_cq;
 319
 320         dev->ibdev.create_qp = ocrdma_create_qp;
 321         dev->ibdev.modify_qp = ocrdma_modify_qp;
 322         dev->ibdev.query_qp = ocrdma_query_qp;
 323         dev->ibdev.destroy_qp = ocrdma_destroy_qp;
 324
 325         dev->ibdev.query_pkey = ocrdma_query_pkey;
 326         dev->ibdev.create_ah = ocrdma_create_ah;
 327         dev->ibdev.destroy_ah = ocrdma_destroy_ah;
 328         dev->ibdev.query_ah = ocrdma_query_ah;
 329         dev->ibdev.modify_ah = ocrdma_modify_ah;
 330
 331         dev->ibdev.poll_cq = ocrdma_poll_cq;
 332         dev->ibdev.post_send = ocrdma_post_send;
 333         dev->ibdev.post_recv = ocrdma_post_recv;
 334         dev->ibdev.req_notify_cq = ocrdma_arm_cq;
 335
 336         dev->ibdev.get_dma_mr = ocrdma_get_dma_mr;
 337         dev->ibdev.dereg_mr = ocrdma_dereg_mr;
 338         dev->ibdev.reg_user_mr = ocrdma_reg_user_mr;
 339
 340         /* mandatory to support user space verbs consumer. */
 341         dev->ibdev.alloc_ucontext = ocrdma_alloc_ucontext;
 342         dev->ibdev.dealloc_ucontext = ocrdma_dealloc_ucontext;
 343         dev->ibdev.mmap = ocrdma_mmap;
 344         dev->ibdev.dma_device = &dev->nic_info.pdev->dev;
 345
 346         dev->ibdev.process_mad = ocrdma_process_mad;
 347
 348         if (dev->nic_info.dev_family == OCRDMA_GEN2_FAMILY) {
 349                 dev->ibdev.uverbs_cmd_mask |=
 350                      OCRDMA_UVERBS(CREATE_SRQ) |
 351                      OCRDMA_UVERBS(MODIFY_SRQ) |
 352                      OCRDMA_UVERBS(QUERY_SRQ) |
 353                      OCRDMA_UVERBS(DESTROY_SRQ) |
 354                      OCRDMA_UVERBS(POST_SRQ_RECV);
 355
 356                 dev->ibdev.create_srq = ocrdma_create_srq;
 357                 dev->ibdev.modify_srq = ocrdma_modify_srq;
 358                 dev->ibdev.query_srq = ocrdma_query_srq;
 359                 dev->ibdev.destroy_srq = ocrdma_destroy_srq;
 360                 dev->ibdev.post_srq_recv = ocrdma_post_srq_recv;
 361         }
 362         return ib_register_device(&dev->ibdev, NULL);
 363 }
 364
 365 static int ocrdma_alloc_resources(struct ocrdma_dev *dev)
 366 {
 367         mutex_init(&dev->dev_lock);
 368         dev->sgid_tbl = kzalloc(sizeof(union ib_gid) *
 369                                 OCRDMA_MAX_SGID, GFP_KERNEL);
 370         if (!dev->sgid_tbl)
 371                 goto alloc_err;
 372         spin_lock_init(&dev->sgid_lock);
 373
 374         dev->cq_tbl = kzalloc(sizeof(struct ocrdma_cq *) *
 375                               OCRDMA_MAX_CQ, GFP_KERNEL);
 376         if (!dev->cq_tbl)
 377                 goto alloc_err;
 378
 379         if (dev->attr.max_qp) {
 380                 dev->qp_tbl = kzalloc(sizeof(struct ocrdma_qp *) *
 381                                       OCRDMA_MAX_QP, GFP_KERNEL);
 382                 if (!dev->qp_tbl)
 383                         goto alloc_err;
 384         }
 385         spin_lock_init(&dev->av_tbl.lock);
 386         spin_lock_init(&dev->flush_q_lock);
 387         return 0;
 388 alloc_err:
 389         ocrdma_err("%s(%d) error.\n", __func__, dev->id);
 390         return -ENOMEM;
 391 }
 392
 393 static void ocrdma_free_resources(struct ocrdma_dev *dev)
 394 {
 395         kfree(dev->qp_tbl);
 396         kfree(dev->cq_tbl);
 397         kfree(dev->sgid_tbl);
 398 }
 399
 400 static struct ocrdma_dev *ocrdma_add(struct be_dev_info *dev_info)
 401 {
 402         int status = 0;
 403         struct ocrdma_dev *dev;
 404
 405         dev = (struct ocrdma_dev *)ib_alloc_device(sizeof(struct ocrdma_dev));
 406         if (!dev) {
 407                 ocrdma_err("Unable to allocate ib device\n");
 408                 return NULL;
 409         }
 410         dev->mbx_cmd = kzalloc(sizeof(struct ocrdma_mqe_emb_cmd), GFP_KERNEL);
 411         if (!dev->mbx_cmd)
 412                 goto idr_err;
 413
 414         memcpy(&dev->nic_info, dev_info, sizeof(*dev_info));
 415         dev->id = ocrdma_get_instance();
 416         if (dev->id < 0)
 417                 goto idr_err;
 418
 419         status = ocrdma_init_hw(dev);
 420         if (status)
 421                 goto init_err;
 422
 423         status = ocrdma_alloc_resources(dev);
 424         if (status)
 425                 goto alloc_err;
 426
 427         status = ocrdma_build_sgid_tbl(dev);
 428         if (status)
 429                 goto alloc_err;
 430
 431         status = ocrdma_register_device(dev);
 432         if (status)
 433                 goto alloc_err;
 434
 435         spin_lock(&ocrdma_devlist_lock);
 436         list_add_tail_rcu(&dev->entry, &ocrdma_dev_list);
 437         spin_unlock(&ocrdma_devlist_lock);
 438         return dev;
 439
 440 alloc_err:
 441         ocrdma_free_resources(dev);
 442         ocrdma_cleanup_hw(dev);
 443 init_err:
 444         idr_remove(&ocrdma_dev_id, dev->id);
 445 idr_err:
 446         kfree(dev->mbx_cmd);
 447         ib_dealloc_device(&dev->ibdev);
 448         ocrdma_err("%s() leaving. ret=%d\n", __func__, status);
 449         return NULL;
 450 }
 451
 452 static void ocrdma_remove_free(struct rcu_head *rcu)
 453 {
 454         struct ocrdma_dev *dev = container_of(rcu, struct ocrdma_dev, rcu);
 455
 456         ocrdma_free_resources(dev);
 457         ocrdma_cleanup_hw(dev);
 458
 459         idr_remove(&ocrdma_dev_id, dev->id);
 460         kfree(dev->mbx_cmd);
 461         ib_dealloc_device(&dev->ibdev);
 462 }
 463
 464 static void ocrdma_remove(struct ocrdma_dev *dev)
 465 {
 466         /* first unregister with stack to stop all the active traffic
 467          * of the registered clients.
 468          */
 469         ib_unregister_device(&dev->ibdev);
 470
 471         spin_lock(&ocrdma_devlist_lock);
 472         list_del_rcu(&dev->entry);
 473         spin_unlock(&ocrdma_devlist_lock);
 474         call_rcu(&dev->rcu, ocrdma_remove_free);
 475 }
 476
 477 static int ocrdma_open(struct ocrdma_dev *dev)
 478 {
 479         struct ib_event port_event;
 480
 481         port_event.event = IB_EVENT_PORT_ACTIVE;
 482         port_event.element.port_num = 1;
 483         port_event.device = &dev->ibdev;
 484         ib_dispatch_event(&port_event);
 485         return 0;
 486 }
 487
 488 static int ocrdma_close(struct ocrdma_dev *dev)
 489 {
 490         int i;
 491         struct ocrdma_qp *qp, **cur_qp;
 492         struct ib_event err_event;
 493         struct ib_qp_attr attrs;
 494         int attr_mask = IB_QP_STATE;
 495
 496         attrs.qp_state = IB_QPS_ERR;
 497         mutex_lock(&dev->dev_lock);
 498         if (dev->qp_tbl) {
 499                 cur_qp = dev->qp_tbl;
 500                 for (i = 0; i < OCRDMA_MAX_QP; i++) {
 501                         qp = cur_qp[i];
 502                         if (qp) {
 503                                 /* change the QP state to ERROR */
 504                                 _ocrdma_modify_qp(&qp->ibqp, &attrs, attr_mask);
 505
 506                                 err_event.event = IB_EVENT_QP_FATAL;
 507                                 err_event.element.qp = &qp->ibqp;
 508                                 err_event.device = &dev->ibdev;
 509                                 ib_dispatch_event(&err_event);
 510                         }
 511                 }
 512         }
 513         mutex_unlock(&dev->dev_lock);
 514
 515         err_event.event = IB_EVENT_PORT_ERR;
 516         err_event.element.port_num = 1;
 517         err_event.device = &dev->ibdev;
 518         ib_dispatch_event(&err_event);
 519         return 0;
 520 }
 521
 522 /* event handling via NIC driver ensures that all the NIC specific
 523  * initialization done before RoCE driver notifies
 524  * event to stack.
 525  */
 526 static void ocrdma_event_handler(struct ocrdma_dev *dev, u32 event)
 527 {
 528         switch (event) {
 529         case BE_DEV_UP:
 530                 ocrdma_open(dev);
 531                 break;
 532         case BE_DEV_DOWN:
 533                 ocrdma_close(dev);
 534                 break;
 535         };
 536 }
 537
 538 static struct ocrdma_driver ocrdma_drv = {
 539         .name                   = "ocrdma_driver",
 540         .add                    = ocrdma_add,
 541         .remove                 = ocrdma_remove,
 542         .state_change_handler   = ocrdma_event_handler,
 543 };
 544
 545 static void ocrdma_unregister_inet6addr_notifier(void)
 546 {
 547 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 548         unregister_inet6addr_notifier(&ocrdma_inet6addr_notifier);
 549 #endif
 550 }
 551
 552 static int __init ocrdma_init_module(void)
 553 {
 554         int status;
 555
 556 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 557         status = register_inet6addr_notifier(&ocrdma_inet6addr_notifier);
 558         if (status)
 559                 return status;
 560 #endif
 561
 562         status = be_roce_register_driver(&ocrdma_drv);
 563         if (status)
 564                 ocrdma_unregister_inet6addr_notifier();
 565
 566         return status;
 567 }
 568
 569 static void __exit ocrdma_exit_module(void)
 570 {
 571         be_roce_unregister_driver(&ocrdma_drv);
 572         ocrdma_unregister_inet6addr_notifier();
 573 }
 574
 575 module_init(ocrdma_init_module);
 576 module_exit(ocrdma_exit_module);