root/drivers/infiniband/hw/vmw_pvrdma/pvrdma_verbs.c

DEFINITIONS

1. pvrdma_query_device
2. pvrdma_query_port
3. pvrdma_query_gid
4. pvrdma_query_pkey
5. pvrdma_port_link_layer
6. pvrdma_modify_device
7. pvrdma_modify_port
8. pvrdma_alloc_ucontext
9. pvrdma_dealloc_ucontext
10. pvrdma_mmap
11. pvrdma_alloc_pd
12. pvrdma_dealloc_pd
13. pvrdma_create_ah
14. pvrdma_destroy_ah

   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  */
  65 int 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  */
 128 int 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  */
 186 int 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  */
 208 int 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 
 234 enum rdma_link_layer pvrdma_port_link_layer(struct ib_device *ibdev,
 235                                             u8 port)
 236 {
 237         return IB_LINK_LAYER_ETHERNET;
 238 }
 239 
 240 int 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  */
 277 int 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 
 301 out:
 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  */
 313 int 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 
 360 err:
 361         pvrdma_uar_free(vdev, &context->uar);
 362         return ret;
 363 }
 364 
 365 /**
 366  * pvrdma_dealloc_ucontext - deallocate ucontext
 367  * @ibcontext: the ucontext
 368  */
 369 void 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  */
 395 int 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  */
 427 int 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 
 472 err:
 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  */
 484 void 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  */
 512 int 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  */
 550 void 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 }