linux/drivers/infiniband/hw/vmw_pvrdma/pvrdma_verbs.c
<<
>>
Prefs
   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 <asm/page.h>
  47#include <linux/inet.h>
  48#include <linux/io.h>
  49#include <rdma/ib_addr.h>
  50#include <rdma/ib_smi.h>
  51#include <rdma/ib_user_verbs.h>
  52#include <rdma/vmw_pvrdma-abi.h>
  53#include <rdma/uverbs_ioctl.h>
  54
  55#include "pvrdma.h"
  56
  57/**
  58 * pvrdma_query_device - query device
  59 * @ibdev: the device to query
  60 * @props: the device properties
  61 * @uhw: user data
  62 *
  63 * @return: 0 on success, otherwise negative errno
  64 */
  65int pvrdma_query_device(struct ib_device *ibdev,
  66                        struct ib_device_attr *props,
  67                        struct ib_udata *uhw)
  68{
  69        struct pvrdma_dev *dev = to_vdev(ibdev);
  70
  71        if (uhw->inlen || uhw->outlen)
  72                return -EINVAL;
  73
  74        props->fw_ver = dev->dsr->caps.fw_ver;
  75        props->sys_image_guid = dev->dsr->caps.sys_image_guid;
  76        props->max_mr_size = dev->dsr->caps.max_mr_size;
  77        props->page_size_cap = dev->dsr->caps.page_size_cap;
  78        props->vendor_id = dev->dsr->caps.vendor_id;
  79        props->vendor_part_id = dev->pdev->device;
  80        props->hw_ver = dev->dsr->caps.hw_ver;
  81        props->max_qp = dev->dsr->caps.max_qp;
  82        props->max_qp_wr = dev->dsr->caps.max_qp_wr;
  83        props->device_cap_flags = dev->dsr->caps.device_cap_flags;
  84        props->max_send_sge = dev->dsr->caps.max_sge;
  85        props->max_recv_sge = dev->dsr->caps.max_sge;
  86        props->max_sge_rd = PVRDMA_GET_CAP(dev, dev->dsr->caps.max_sge,
  87                                           dev->dsr->caps.max_sge_rd);
  88        props->max_srq = dev->dsr->caps.max_srq;
  89        props->max_srq_wr = dev->dsr->caps.max_srq_wr;
  90        props->max_srq_sge = dev->dsr->caps.max_srq_sge;
  91        props->max_cq = dev->dsr->caps.max_cq;
  92        props->max_cqe = dev->dsr->caps.max_cqe;
  93        props->max_mr = dev->dsr->caps.max_mr;
  94        props->max_pd = dev->dsr->caps.max_pd;
  95        props->max_qp_rd_atom = dev->dsr->caps.max_qp_rd_atom;
  96        props->max_qp_init_rd_atom = dev->dsr->caps.max_qp_init_rd_atom;
  97        props->atomic_cap =
  98                dev->dsr->caps.atomic_ops &
  99                (PVRDMA_ATOMIC_OP_COMP_SWAP | PVRDMA_ATOMIC_OP_FETCH_ADD) ?
 100                IB_ATOMIC_HCA : IB_ATOMIC_NONE;
 101        props->masked_atomic_cap = props->atomic_cap;
 102        props->max_ah = dev->dsr->caps.max_ah;
 103        props->max_pkeys = dev->dsr->caps.max_pkeys;
 104        props->local_ca_ack_delay = dev->dsr->caps.local_ca_ack_delay;
 105        if ((dev->dsr->caps.bmme_flags & PVRDMA_BMME_FLAG_LOCAL_INV) &&
 106            (dev->dsr->caps.bmme_flags & PVRDMA_BMME_FLAG_REMOTE_INV) &&
 107            (dev->dsr->caps.bmme_flags & PVRDMA_BMME_FLAG_FAST_REG_WR)) {
 108                props->device_cap_flags |= IB_DEVICE_MEM_MGT_EXTENSIONS;
 109                props->max_fast_reg_page_list_len = PVRDMA_GET_CAP(dev,
 110                                PVRDMA_MAX_FAST_REG_PAGES,
 111                                dev->dsr->caps.max_fast_reg_page_list_len);
 112        }
 113
 114        props->device_cap_flags |= IB_DEVICE_PORT_ACTIVE_EVENT |
 115                                   IB_DEVICE_RC_RNR_NAK_GEN;
 116
 117        return 0;
 118}
 119
 120/**
 121 * pvrdma_query_port - query device port attributes
 122 * @ibdev: the device to query
 123 * @port: the port number
 124 * @props: the device properties
 125 *
 126 * @return: 0 on success, otherwise negative errno
 127 */
 128int pvrdma_query_port(struct ib_device *ibdev, u8 port,
 129                      struct ib_port_attr *props)
 130{
 131        struct pvrdma_dev *dev = to_vdev(ibdev);
 132        union pvrdma_cmd_req req;
 133        union pvrdma_cmd_resp rsp;
 134        struct pvrdma_cmd_query_port *cmd = &req.query_port;
 135        struct pvrdma_cmd_query_port_resp *resp = &rsp.query_port_resp;
 136        int err;
 137
 138        memset(cmd, 0, sizeof(*cmd));
 139        cmd->hdr.cmd = PVRDMA_CMD_QUERY_PORT;
 140        cmd->port_num = port;
 141
 142        err = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_PORT_RESP);
 143        if (err < 0) {
 144                dev_warn(&dev->pdev->dev,
 145                         "could not query port, error: %d\n", err);
 146                return err;
 147        }
 148
 149        /* props being zeroed by the caller, avoid zeroing it here */
 150
 151        props->state = pvrdma_port_state_to_ib(resp->attrs.state);
 152        props->max_mtu = pvrdma_mtu_to_ib(resp->attrs.max_mtu);
 153        props->active_mtu = pvrdma_mtu_to_ib(resp->attrs.active_mtu);
 154        props->gid_tbl_len = resp->attrs.gid_tbl_len;
 155        props->port_cap_flags =
 156                pvrdma_port_cap_flags_to_ib(resp->attrs.port_cap_flags);
 157        props->port_cap_flags |= IB_PORT_CM_SUP;
 158        props->ip_gids = true;
 159        props->max_msg_sz = resp->attrs.max_msg_sz;
 160        props->bad_pkey_cntr = resp->attrs.bad_pkey_cntr;
 161        props->qkey_viol_cntr = resp->attrs.qkey_viol_cntr;
 162        props->pkey_tbl_len = resp->attrs.pkey_tbl_len;
 163        props->lid = resp->attrs.lid;
 164        props->sm_lid = resp->attrs.sm_lid;
 165        props->lmc = resp->attrs.lmc;
 166        props->max_vl_num = resp->attrs.max_vl_num;
 167        props->sm_sl = resp->attrs.sm_sl;
 168        props->subnet_timeout = resp->attrs.subnet_timeout;
 169        props->init_type_reply = resp->attrs.init_type_reply;
 170        props->active_width = pvrdma_port_width_to_ib(resp->attrs.active_width);
 171        props->active_speed = pvrdma_port_speed_to_ib(resp->attrs.active_speed);
 172        props->phys_state = resp->attrs.phys_state;
 173
 174        return 0;
 175}
 176
 177/**
 178 * pvrdma_query_gid - query device gid
 179 * @ibdev: the device to query
 180 * @port: the port number
 181 * @index: the index
 182 * @gid: the device gid value
 183 *
 184 * @return: 0 on success, otherwise negative errno
 185 */
 186int pvrdma_query_gid(struct ib_device *ibdev, u8 port, int index,
 187                     union ib_gid *gid)
 188{
 189        struct pvrdma_dev *dev = to_vdev(ibdev);
 190
 191        if (index >= dev->dsr->caps.gid_tbl_len)
 192                return -EINVAL;
 193
 194        memcpy(gid, &dev->sgid_tbl[index], sizeof(union ib_gid));
 195
 196        return 0;
 197}
 198
 199/**
 200 * pvrdma_query_pkey - query device port's P_Key table
 201 * @ibdev: the device to query
 202 * @port: the port number
 203 * @index: the index
 204 * @pkey: the device P_Key value
 205 *
 206 * @return: 0 on success, otherwise negative errno
 207 */
 208int pvrdma_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
 209                      u16 *pkey)
 210{
 211        int err = 0;
 212        union pvrdma_cmd_req req;
 213        union pvrdma_cmd_resp rsp;
 214        struct pvrdma_cmd_query_pkey *cmd = &req.query_pkey;
 215
 216        memset(cmd, 0, sizeof(*cmd));
 217        cmd->hdr.cmd = PVRDMA_CMD_QUERY_PKEY;
 218        cmd->port_num = port;
 219        cmd->index = index;
 220
 221        err = pvrdma_cmd_post(to_vdev(ibdev), &req, &rsp,
 222                              PVRDMA_CMD_QUERY_PKEY_RESP);
 223        if (err < 0) {
 224                dev_warn(&to_vdev(ibdev)->pdev->dev,
 225                         "could not query pkey, error: %d\n", err);
 226                return err;
 227        }
 228
 229        *pkey = rsp.query_pkey_resp.pkey;
 230
 231        return 0;
 232}
 233
 234enum rdma_link_layer pvrdma_port_link_layer(struct ib_device *ibdev,
 235                                            u8 port)
 236{
 237        return IB_LINK_LAYER_ETHERNET;
 238}
 239
 240int pvrdma_modify_device(struct ib_device *ibdev, int mask,
 241                         struct ib_device_modify *props)
 242{
 243        unsigned long flags;
 244
 245        if (mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
 246                     IB_DEVICE_MODIFY_NODE_DESC)) {
 247                dev_warn(&to_vdev(ibdev)->pdev->dev,
 248                         "unsupported device modify mask %#x\n", mask);
 249                return -EOPNOTSUPP;
 250        }
 251
 252        if (mask & IB_DEVICE_MODIFY_NODE_DESC) {
 253                spin_lock_irqsave(&to_vdev(ibdev)->desc_lock, flags);
 254                memcpy(ibdev->node_desc, props->node_desc, 64);
 255                spin_unlock_irqrestore(&to_vdev(ibdev)->desc_lock, flags);
 256        }
 257
 258        if (mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID) {
 259                mutex_lock(&to_vdev(ibdev)->port_mutex);
 260                to_vdev(ibdev)->sys_image_guid =
 261                        cpu_to_be64(props->sys_image_guid);
 262                mutex_unlock(&to_vdev(ibdev)->port_mutex);
 263        }
 264
 265        return 0;
 266}
 267
 268/**
 269 * pvrdma_modify_port - modify device port attributes
 270 * @ibdev: the device to modify
 271 * @port: the port number
 272 * @mask: attributes to modify
 273 * @props: the device properties
 274 *
 275 * @return: 0 on success, otherwise negative errno
 276 */
 277int pvrdma_modify_port(struct ib_device *ibdev, u8 port, int mask,
 278                       struct ib_port_modify *props)
 279{
 280        struct ib_port_attr attr;
 281        struct pvrdma_dev *vdev = to_vdev(ibdev);
 282        int ret;
 283
 284        if (mask & ~IB_PORT_SHUTDOWN) {
 285                dev_warn(&vdev->pdev->dev,
 286                         "unsupported port modify mask %#x\n", mask);
 287                return -EOPNOTSUPP;
 288        }
 289
 290        mutex_lock(&vdev->port_mutex);
 291        ret = ib_query_port(ibdev, port, &attr);
 292        if (ret)
 293                goto out;
 294
 295        vdev->port_cap_mask |= props->set_port_cap_mask;
 296        vdev->port_cap_mask &= ~props->clr_port_cap_mask;
 297
 298        if (mask & IB_PORT_SHUTDOWN)
 299                vdev->ib_active = false;
 300
 301out:
 302        mutex_unlock(&vdev->port_mutex);
 303        return ret;
 304}
 305
 306/**
 307 * pvrdma_alloc_ucontext - allocate ucontext
 308 * @uctx: the uverbs countext
 309 * @udata: user data
 310 *
 311 * @return:  zero on success, otherwise errno.
 312 */
 313int pvrdma_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
 314{
 315        struct ib_device *ibdev = uctx->device;
 316        struct pvrdma_dev *vdev = to_vdev(ibdev);
 317        struct pvrdma_ucontext *context = to_vucontext(uctx);
 318        union pvrdma_cmd_req req = {};
 319        union pvrdma_cmd_resp rsp = {};
 320        struct pvrdma_cmd_create_uc *cmd = &req.create_uc;
 321        struct pvrdma_cmd_create_uc_resp *resp = &rsp.create_uc_resp;
 322        struct pvrdma_alloc_ucontext_resp uresp = {};
 323        int ret;
 324
 325        if (!vdev->ib_active)
 326                return -EAGAIN;
 327
 328        context->dev = vdev;
 329        ret = pvrdma_uar_alloc(vdev, &context->uar);
 330        if (ret)
 331                return -ENOMEM;
 332
 333        /* get ctx_handle from host */
 334        if (vdev->dsr_version < PVRDMA_PPN64_VERSION)
 335                cmd->pfn = context->uar.pfn;
 336        else
 337                cmd->pfn64 = context->uar.pfn;
 338
 339        cmd->hdr.cmd = PVRDMA_CMD_CREATE_UC;
 340        ret = pvrdma_cmd_post(vdev, &req, &rsp, PVRDMA_CMD_CREATE_UC_RESP);
 341        if (ret < 0) {
 342                dev_warn(&vdev->pdev->dev,
 343                         "could not create ucontext, error: %d\n", ret);
 344                goto err;
 345        }
 346
 347        context->ctx_handle = resp->ctx_handle;
 348
 349        /* copy back to user */
 350        uresp.qp_tab_size = vdev->dsr->caps.max_qp;
 351        ret = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
 352        if (ret) {
 353                pvrdma_uar_free(vdev, &context->uar);
 354                pvrdma_dealloc_ucontext(&context->ibucontext);
 355                return -EFAULT;
 356        }
 357
 358        return 0;
 359
 360err:
 361        pvrdma_uar_free(vdev, &context->uar);
 362        return ret;
 363}
 364
 365/**
 366 * pvrdma_dealloc_ucontext - deallocate ucontext
 367 * @ibcontext: the ucontext
 368 */
 369void pvrdma_dealloc_ucontext(struct ib_ucontext *ibcontext)
 370{
 371        struct pvrdma_ucontext *context = to_vucontext(ibcontext);
 372        union pvrdma_cmd_req req = {};
 373        struct pvrdma_cmd_destroy_uc *cmd = &req.destroy_uc;
 374        int ret;
 375
 376        cmd->hdr.cmd = PVRDMA_CMD_DESTROY_UC;
 377        cmd->ctx_handle = context->ctx_handle;
 378
 379        ret = pvrdma_cmd_post(context->dev, &req, NULL, 0);
 380        if (ret < 0)
 381                dev_warn(&context->dev->pdev->dev,
 382                         "destroy ucontext failed, error: %d\n", ret);
 383
 384        /* Free the UAR even if the device command failed */
 385        pvrdma_uar_free(to_vdev(ibcontext->device), &context->uar);
 386}
 387
 388/**
 389 * pvrdma_mmap - create mmap region
 390 * @ibcontext: the user context
 391 * @vma: the VMA
 392 *
 393 * @return: 0 on success, otherwise errno.
 394 */
 395int pvrdma_mmap(struct ib_ucontext *ibcontext, struct vm_area_struct *vma)
 396{
 397        struct pvrdma_ucontext *context = to_vucontext(ibcontext);
 398        unsigned long start = vma->vm_start;
 399        unsigned long size = vma->vm_end - vma->vm_start;
 400        unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
 401
 402        dev_dbg(&context->dev->pdev->dev, "create mmap region\n");
 403
 404        if ((size != PAGE_SIZE) || (offset & ~PAGE_MASK)) {
 405                dev_warn(&context->dev->pdev->dev,
 406                         "invalid params for mmap region\n");
 407                return -EINVAL;
 408        }
 409
 410        /* Map UAR to kernel space, VM_LOCKED? */
 411        vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
 412        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 413        if (io_remap_pfn_range(vma, start, context->uar.pfn, size,
 414                               vma->vm_page_prot))
 415                return -EAGAIN;
 416
 417        return 0;
 418}
 419
 420/**
 421 * pvrdma_alloc_pd - allocate protection domain
 422 * @ibpd: PD pointer
 423 * @udata: user data
 424 *
 425 * @return: the ib_pd protection domain pointer on success, otherwise errno.
 426 */
 427int pvrdma_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
 428{
 429        struct ib_device *ibdev = ibpd->device;
 430        struct pvrdma_pd *pd = to_vpd(ibpd);
 431        struct pvrdma_dev *dev = to_vdev(ibdev);
 432        union pvrdma_cmd_req req = {};
 433        union pvrdma_cmd_resp rsp = {};
 434        struct pvrdma_cmd_create_pd *cmd = &req.create_pd;
 435        struct pvrdma_cmd_create_pd_resp *resp = &rsp.create_pd_resp;
 436        struct pvrdma_alloc_pd_resp pd_resp = {0};
 437        int ret;
 438        struct pvrdma_ucontext *context = rdma_udata_to_drv_context(
 439                udata, struct pvrdma_ucontext, ibucontext);
 440
 441        /* Check allowed max pds */
 442        if (!atomic_add_unless(&dev->num_pds, 1, dev->dsr->caps.max_pd))
 443                return -ENOMEM;
 444
 445        cmd->hdr.cmd = PVRDMA_CMD_CREATE_PD;
 446        cmd->ctx_handle = context ? context->ctx_handle : 0;
 447        ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_PD_RESP);
 448        if (ret < 0) {
 449                dev_warn(&dev->pdev->dev,
 450                         "failed to allocate protection domain, error: %d\n",
 451                         ret);
 452                goto err;
 453        }
 454
 455        pd->privileged = !udata;
 456        pd->pd_handle = resp->pd_handle;
 457        pd->pdn = resp->pd_handle;
 458        pd_resp.pdn = resp->pd_handle;
 459
 460        if (udata) {
 461                if (ib_copy_to_udata(udata, &pd_resp, sizeof(pd_resp))) {
 462                        dev_warn(&dev->pdev->dev,
 463                                 "failed to copy back protection domain\n");
 464                        pvrdma_dealloc_pd(&pd->ibpd, udata);
 465                        return -EFAULT;
 466                }
 467        }
 468
 469        /* u32 pd handle */
 470        return 0;
 471
 472err:
 473        atomic_dec(&dev->num_pds);
 474        return ret;
 475}
 476
 477/**
 478 * pvrdma_dealloc_pd - deallocate protection domain
 479 * @pd: the protection domain to be released
 480 * @udata: user data or null for kernel object
 481 *
 482 * @return: 0 on success, otherwise errno.
 483 */
 484void pvrdma_dealloc_pd(struct ib_pd *pd, struct ib_udata *udata)
 485{
 486        struct pvrdma_dev *dev = to_vdev(pd->device);
 487        union pvrdma_cmd_req req = {};
 488        struct pvrdma_cmd_destroy_pd *cmd = &req.destroy_pd;
 489        int ret;
 490
 491        cmd->hdr.cmd = PVRDMA_CMD_DESTROY_PD;
 492        cmd->pd_handle = to_vpd(pd)->pd_handle;
 493
 494        ret = pvrdma_cmd_post(dev, &req, NULL, 0);
 495        if (ret)
 496                dev_warn(&dev->pdev->dev,
 497                         "could not dealloc protection domain, error: %d\n",
 498                         ret);
 499
 500        atomic_dec(&dev->num_pds);
 501}
 502
 503/**
 504 * pvrdma_create_ah - create an address handle
 505 * @pd: the protection domain
 506 * @ah_attr: the attributes of the AH
 507 * @udata: user data blob
 508 * @flags: create address handle flags (see enum rdma_create_ah_flags)
 509 *
 510 * @return: 0 on success, otherwise errno.
 511 */
 512int pvrdma_create_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr,
 513                     u32 flags, struct ib_udata *udata)
 514{
 515        struct pvrdma_dev *dev = to_vdev(ibah->device);
 516        struct pvrdma_ah *ah = to_vah(ibah);
 517        const struct ib_global_route *grh;
 518        u8 port_num = rdma_ah_get_port_num(ah_attr);
 519
 520        if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
 521                return -EINVAL;
 522
 523        grh = rdma_ah_read_grh(ah_attr);
 524        if ((ah_attr->type != RDMA_AH_ATTR_TYPE_ROCE)  ||
 525            rdma_is_multicast_addr((struct in6_addr *)grh->dgid.raw))
 526                return -EINVAL;
 527
 528        if (!atomic_add_unless(&dev->num_ahs, 1, dev->dsr->caps.max_ah))
 529                return -ENOMEM;
 530
 531        ah->av.port_pd = to_vpd(ibah->pd)->pd_handle | (port_num << 24);
 532        ah->av.src_path_bits = rdma_ah_get_path_bits(ah_attr);
 533        ah->av.src_path_bits |= 0x80;
 534        ah->av.gid_index = grh->sgid_index;
 535        ah->av.hop_limit = grh->hop_limit;
 536        ah->av.sl_tclass_flowlabel = (grh->traffic_class << 20) |
 537                                      grh->flow_label;
 538        memcpy(ah->av.dgid, grh->dgid.raw, 16);
 539        memcpy(ah->av.dmac, ah_attr->roce.dmac, ETH_ALEN);
 540
 541        return 0;
 542}
 543
 544/**
 545 * pvrdma_destroy_ah - destroy an address handle
 546 * @ah: the address handle to destroyed
 547 * @flags: destroy address handle flags (see enum rdma_destroy_ah_flags)
 548 *
 549 */
 550void pvrdma_destroy_ah(struct ib_ah *ah, u32 flags)
 551{
 552        struct pvrdma_dev *dev = to_vdev(ah->device);
 553
 554        atomic_dec(&dev->num_ahs);
 555}
 556