hw/vmw_pvrdma/pvrdma_verbs.c

0001 /*
0002  * Copyright (c) 2012-2016 VMware, Inc.  All rights reserved.
0003  *
0004  * This program is free software; you can redistribute it and/or
0005  * modify it under the terms of EITHER the GNU General Public License
0006  * version 2 as published by the Free Software Foundation or the BSD
0007  * 2-Clause License. This program is distributed in the hope that it
0008  * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
0009  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
0010  * See the GNU General Public License version 2 for more details at
0011  * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
0012  *
0013  * You should have received a copy of the GNU General Public License
0014  * along with this program available in the file COPYING in the main
0015  * directory of this source tree.
0016  *
0017  * The BSD 2-Clause License
0018  *
0019  *     Redistribution and use in source and binary forms, with or
0020  *     without modification, are permitted provided that the following
0021  *     conditions are met:
0022  *
0023  *      - Redistributions of source code must retain the above
0024  *        copyright notice, this list of conditions and the following
0025  *        disclaimer.
0026  *
0027  *      - Redistributions in binary form must reproduce the above
0028  *        copyright notice, this list of conditions and the following
0029  *        disclaimer in the documentation and/or other materials
0030  *        provided with the distribution.
0031  *
0032  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
0033  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
0034  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
0035  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
0036  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
0037  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
0038  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
0039  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
0040  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
0041  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0042  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
0043  * OF THE POSSIBILITY OF SUCH DAMAGE.
0044  */
0045
0046 #include <asm/page.h>
0047 #include <linux/inet.h>
0048 #include <linux/io.h>
0049 #include <rdma/ib_addr.h>
0050 #include <rdma/ib_smi.h>
0051 #include <rdma/ib_user_verbs.h>
0052 #include <rdma/vmw_pvrdma-abi.h>
0053 #include <rdma/uverbs_ioctl.h>
0054
0055 #include "pvrdma.h"
0056
0057 /**
0058  * pvrdma_query_device - query device
0059  * @ibdev: the device to query
0060  * @props: the device properties
0061  * @uhw: user data
0062  *
0063  * @return: 0 on success, otherwise negative errno
0064  */
0065 int pvrdma_query_device(struct ib_device *ibdev,
0066             struct ib_device_attr *props,
0067             struct ib_udata *uhw)
0068 {
0069     struct pvrdma_dev *dev = to_vdev(ibdev);
0070
0071     if (uhw->inlen || uhw->outlen)
0072         return -EINVAL;
0073
0074     props->fw_ver = dev->dsr->caps.fw_ver;
0075     props->sys_image_guid = dev->dsr->caps.sys_image_guid;
0076     props->max_mr_size = dev->dsr->caps.max_mr_size;
0077     props->page_size_cap = dev->dsr->caps.page_size_cap;
0078     props->vendor_id = dev->dsr->caps.vendor_id;
0079     props->vendor_part_id = dev->pdev->device;
0080     props->hw_ver = dev->dsr->caps.hw_ver;
0081     props->max_qp = dev->dsr->caps.max_qp;
0082     props->max_qp_wr = dev->dsr->caps.max_qp_wr;
0083     props->device_cap_flags = dev->dsr->caps.device_cap_flags;
0084     props->max_send_sge = dev->dsr->caps.max_sge;
0085     props->max_recv_sge = dev->dsr->caps.max_sge;
0086     props->max_sge_rd = PVRDMA_GET_CAP(dev, dev->dsr->caps.max_sge,
0087                        dev->dsr->caps.max_sge_rd);
0088     props->max_srq = dev->dsr->caps.max_srq;
0089     props->max_srq_wr = dev->dsr->caps.max_srq_wr;
0090     props->max_srq_sge = dev->dsr->caps.max_srq_sge;
0091     props->max_cq = dev->dsr->caps.max_cq;
0092     props->max_cqe = dev->dsr->caps.max_cqe;
0093     props->max_mr = dev->dsr->caps.max_mr;
0094     props->max_pd = dev->dsr->caps.max_pd;
0095     props->max_qp_rd_atom = dev->dsr->caps.max_qp_rd_atom;
0096     props->max_qp_init_rd_atom = dev->dsr->caps.max_qp_init_rd_atom;
0097     props->atomic_cap =
0098         dev->dsr->caps.atomic_ops &
0099         (PVRDMA_ATOMIC_OP_COMP_SWAP | PVRDMA_ATOMIC_OP_FETCH_ADD) ?
0100         IB_ATOMIC_HCA : IB_ATOMIC_NONE;
0101     props->masked_atomic_cap = props->atomic_cap;
0102     props->max_ah = dev->dsr->caps.max_ah;
0103     props->max_pkeys = dev->dsr->caps.max_pkeys;
0104     props->local_ca_ack_delay = dev->dsr->caps.local_ca_ack_delay;
0105     if ((dev->dsr->caps.bmme_flags & PVRDMA_BMME_FLAG_LOCAL_INV) &&
0106         (dev->dsr->caps.bmme_flags & PVRDMA_BMME_FLAG_REMOTE_INV) &&
0107         (dev->dsr->caps.bmme_flags & PVRDMA_BMME_FLAG_FAST_REG_WR)) {
0108         props->device_cap_flags |= IB_DEVICE_MEM_MGT_EXTENSIONS;
0109         props->max_fast_reg_page_list_len = PVRDMA_GET_CAP(dev,
0110                 PVRDMA_MAX_FAST_REG_PAGES,
0111                 dev->dsr->caps.max_fast_reg_page_list_len);
0112     }
0113
0114     props->device_cap_flags |= IB_DEVICE_PORT_ACTIVE_EVENT |
0115                    IB_DEVICE_RC_RNR_NAK_GEN;
0116
0117     return 0;
0118 }
0119
0120 /**
0121  * pvrdma_query_port - query device port attributes
0122  * @ibdev: the device to query
0123  * @port: the port number
0124  * @props: the device properties
0125  *
0126  * @return: 0 on success, otherwise negative errno
0127  */
0128 int pvrdma_query_port(struct ib_device *ibdev, u32 port,
0129               struct ib_port_attr *props)
0130 {
0131     struct pvrdma_dev *dev = to_vdev(ibdev);
0132     union pvrdma_cmd_req req;
0133     union pvrdma_cmd_resp rsp;
0134     struct pvrdma_cmd_query_port *cmd = &req.query_port;
0135     struct pvrdma_cmd_query_port_resp *resp = &rsp.query_port_resp;
0136     int err;
0137
0138     memset(cmd, 0, sizeof(*cmd));
0139     cmd->hdr.cmd = PVRDMA_CMD_QUERY_PORT;
0140     cmd->port_num = port;
0141
0142     err = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_PORT_RESP);
0143     if (err < 0) {
0144         dev_warn(&dev->pdev->dev,
0145              "could not query port, error: %d\n", err);
0146         return err;
0147     }
0148
0149     /* props being zeroed by the caller, avoid zeroing it here */
0150
0151     props->state = pvrdma_port_state_to_ib(resp->attrs.state);
0152     props->max_mtu = pvrdma_mtu_to_ib(resp->attrs.max_mtu);
0153     props->active_mtu = pvrdma_mtu_to_ib(resp->attrs.active_mtu);
0154     props->gid_tbl_len = resp->attrs.gid_tbl_len;
0155     props->port_cap_flags =
0156         pvrdma_port_cap_flags_to_ib(resp->attrs.port_cap_flags);
0157     props->port_cap_flags |= IB_PORT_CM_SUP;
0158     props->ip_gids = true;
0159     props->max_msg_sz = resp->attrs.max_msg_sz;
0160     props->bad_pkey_cntr = resp->attrs.bad_pkey_cntr;
0161     props->qkey_viol_cntr = resp->attrs.qkey_viol_cntr;
0162     props->pkey_tbl_len = resp->attrs.pkey_tbl_len;
0163     props->lid = resp->attrs.lid;
0164     props->sm_lid = resp->attrs.sm_lid;
0165     props->lmc = resp->attrs.lmc;
0166     props->max_vl_num = resp->attrs.max_vl_num;
0167     props->sm_sl = resp->attrs.sm_sl;
0168     props->subnet_timeout = resp->attrs.subnet_timeout;
0169     props->init_type_reply = resp->attrs.init_type_reply;
0170     props->active_width = pvrdma_port_width_to_ib(resp->attrs.active_width);
0171     props->active_speed = pvrdma_port_speed_to_ib(resp->attrs.active_speed);
0172     props->phys_state = resp->attrs.phys_state;
0173
0174     return 0;
0175 }
0176
0177 /**
0178  * pvrdma_query_gid - query device gid
0179  * @ibdev: the device to query
0180  * @port: the port number
0181  * @index: the index
0182  * @gid: the device gid value
0183  *
0184  * @return: 0 on success, otherwise negative errno
0185  */
0186 int pvrdma_query_gid(struct ib_device *ibdev, u32 port, int index,
0187              union ib_gid *gid)
0188 {
0189     struct pvrdma_dev *dev = to_vdev(ibdev);
0190
0191     if (index >= dev->dsr->caps.gid_tbl_len)
0192         return -EINVAL;
0193
0194     memcpy(gid, &dev->sgid_tbl[index], sizeof(union ib_gid));
0195
0196     return 0;
0197 }
0198
0199 /**
0200  * pvrdma_query_pkey - query device port's P_Key table
0201  * @ibdev: the device to query
0202  * @port: the port number
0203  * @index: the index
0204  * @pkey: the device P_Key value
0205  *
0206  * @return: 0 on success, otherwise negative errno
0207  */
0208 int pvrdma_query_pkey(struct ib_device *ibdev, u32 port, u16 index,
0209               u16 *pkey)
0210 {
0211     int err = 0;
0212     union pvrdma_cmd_req req;
0213     union pvrdma_cmd_resp rsp;
0214     struct pvrdma_cmd_query_pkey *cmd = &req.query_pkey;
0215
0216     memset(cmd, 0, sizeof(*cmd));
0217     cmd->hdr.cmd = PVRDMA_CMD_QUERY_PKEY;
0218     cmd->port_num = port;
0219     cmd->index = index;
0220
0221     err = pvrdma_cmd_post(to_vdev(ibdev), &req, &rsp,
0222                   PVRDMA_CMD_QUERY_PKEY_RESP);
0223     if (err < 0) {
0224         dev_warn(&to_vdev(ibdev)->pdev->dev,
0225              "could not query pkey, error: %d\n", err);
0226         return err;
0227     }
0228
0229     *pkey = rsp.query_pkey_resp.pkey;
0230
0231     return 0;
0232 }
0233
0234 enum rdma_link_layer pvrdma_port_link_layer(struct ib_device *ibdev,
0235                         u32 port)
0236 {
0237     return IB_LINK_LAYER_ETHERNET;
0238 }
0239
0240 int pvrdma_modify_device(struct ib_device *ibdev, int mask,
0241              struct ib_device_modify *props)
0242 {
0243     unsigned long flags;
0244
0245     if (mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
0246              IB_DEVICE_MODIFY_NODE_DESC)) {
0247         dev_warn(&to_vdev(ibdev)->pdev->dev,
0248              "unsupported device modify mask %#x\n", mask);
0249         return -EOPNOTSUPP;
0250     }
0251
0252     if (mask & IB_DEVICE_MODIFY_NODE_DESC) {
0253         spin_lock_irqsave(&to_vdev(ibdev)->desc_lock, flags);
0254         memcpy(ibdev->node_desc, props->node_desc, 64);
0255         spin_unlock_irqrestore(&to_vdev(ibdev)->desc_lock, flags);
0256     }
0257
0258     if (mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID) {
0259         mutex_lock(&to_vdev(ibdev)->port_mutex);
0260         to_vdev(ibdev)->sys_image_guid =
0261             cpu_to_be64(props->sys_image_guid);
0262         mutex_unlock(&to_vdev(ibdev)->port_mutex);
0263     }
0264
0265     return 0;
0266 }
0267
0268 /**
0269  * pvrdma_modify_port - modify device port attributes
0270  * @ibdev: the device to modify
0271  * @port: the port number
0272  * @mask: attributes to modify
0273  * @props: the device properties
0274  *
0275  * @return: 0 on success, otherwise negative errno
0276  */
0277 int pvrdma_modify_port(struct ib_device *ibdev, u32 port, int mask,
0278                struct ib_port_modify *props)
0279 {
0280     struct ib_port_attr attr;
0281     struct pvrdma_dev *vdev = to_vdev(ibdev);
0282     int ret;
0283
0284     if (mask & ~IB_PORT_SHUTDOWN) {
0285         dev_warn(&vdev->pdev->dev,
0286              "unsupported port modify mask %#x\n", mask);
0287         return -EOPNOTSUPP;
0288     }
0289
0290     mutex_lock(&vdev->port_mutex);
0291     ret = ib_query_port(ibdev, port, &attr);
0292     if (ret)
0293         goto out;
0294
0295     vdev->port_cap_mask |= props->set_port_cap_mask;
0296     vdev->port_cap_mask &= ~props->clr_port_cap_mask;
0297
0298     if (mask & IB_PORT_SHUTDOWN)
0299         vdev->ib_active = false;
0300
0301 out:
0302     mutex_unlock(&vdev->port_mutex);
0303     return ret;
0304 }
0305
0306 /**
0307  * pvrdma_alloc_ucontext - allocate ucontext
0308  * @uctx: the uverbs countext
0309  * @udata: user data
0310  *
0311  * @return:  zero on success, otherwise errno.
0312  */
0313 int pvrdma_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
0314 {
0315     struct ib_device *ibdev = uctx->device;
0316     struct pvrdma_dev *vdev = to_vdev(ibdev);
0317     struct pvrdma_ucontext *context = to_vucontext(uctx);
0318     union pvrdma_cmd_req req = {};
0319     union pvrdma_cmd_resp rsp = {};
0320     struct pvrdma_cmd_create_uc *cmd = &req.create_uc;
0321     struct pvrdma_cmd_create_uc_resp *resp = &rsp.create_uc_resp;
0322     struct pvrdma_alloc_ucontext_resp uresp = {};
0323     int ret;
0324
0325     if (!vdev->ib_active)
0326         return -EAGAIN;
0327
0328     context->dev = vdev;
0329     ret = pvrdma_uar_alloc(vdev, &context->uar);
0330     if (ret)
0331         return -ENOMEM;
0332
0333     /* get ctx_handle from host */
0334     if (vdev->dsr_version < PVRDMA_PPN64_VERSION)
0335         cmd->pfn = context->uar.pfn;
0336     else
0337         cmd->pfn64 = context->uar.pfn;
0338
0339     cmd->hdr.cmd = PVRDMA_CMD_CREATE_UC;
0340     ret = pvrdma_cmd_post(vdev, &req, &rsp, PVRDMA_CMD_CREATE_UC_RESP);
0341     if (ret < 0) {
0342         dev_warn(&vdev->pdev->dev,
0343              "could not create ucontext, error: %d\n", ret);
0344         goto err;
0345     }
0346
0347     context->ctx_handle = resp->ctx_handle;
0348
0349     /* copy back to user */
0350     uresp.qp_tab_size = vdev->dsr->caps.max_qp;
0351     ret = ib_copy_to_udata(udata, &uresp, sizeof(uresp));
0352     if (ret) {
0353         pvrdma_uar_free(vdev, &context->uar);
0354         pvrdma_dealloc_ucontext(&context->ibucontext);
0355         return -EFAULT;
0356     }
0357
0358     return 0;
0359
0360 err:
0361     pvrdma_uar_free(vdev, &context->uar);
0362     return ret;
0363 }
0364
0365 /**
0366  * pvrdma_dealloc_ucontext - deallocate ucontext
0367  * @ibcontext: the ucontext
0368  */
0369 void pvrdma_dealloc_ucontext(struct ib_ucontext *ibcontext)
0370 {
0371     struct pvrdma_ucontext *context = to_vucontext(ibcontext);
0372     union pvrdma_cmd_req req = {};
0373     struct pvrdma_cmd_destroy_uc *cmd = &req.destroy_uc;
0374     int ret;
0375
0376     cmd->hdr.cmd = PVRDMA_CMD_DESTROY_UC;
0377     cmd->ctx_handle = context->ctx_handle;
0378
0379     ret = pvrdma_cmd_post(context->dev, &req, NULL, 0);
0380     if (ret < 0)
0381         dev_warn(&context->dev->pdev->dev,
0382              "destroy ucontext failed, error: %d\n", ret);
0383
0384     /* Free the UAR even if the device command failed */
0385     pvrdma_uar_free(to_vdev(ibcontext->device), &context->uar);
0386 }
0387
0388 /**
0389  * pvrdma_mmap - create mmap region
0390  * @ibcontext: the user context
0391  * @vma: the VMA
0392  *
0393  * @return: 0 on success, otherwise errno.
0394  */
0395 int pvrdma_mmap(struct ib_ucontext *ibcontext, struct vm_area_struct *vma)
0396 {
0397     struct pvrdma_ucontext *context = to_vucontext(ibcontext);
0398     unsigned long start = vma->vm_start;
0399     unsigned long size = vma->vm_end - vma->vm_start;
0400     unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
0401
0402     dev_dbg(&context->dev->pdev->dev, "create mmap region\n");
0403
0404     if ((size != PAGE_SIZE) || (offset & ~PAGE_MASK)) {
0405         dev_warn(&context->dev->pdev->dev,
0406              "invalid params for mmap region\n");
0407         return -EINVAL;
0408     }
0409
0410     /* Map UAR to kernel space, VM_LOCKED? */
0411     vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
0412     vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
0413     if (io_remap_pfn_range(vma, start, context->uar.pfn, size,
0414                    vma->vm_page_prot))
0415         return -EAGAIN;
0416
0417     return 0;
0418 }
0419
0420 /**
0421  * pvrdma_alloc_pd - allocate protection domain
0422  * @ibpd: PD pointer
0423  * @udata: user data
0424  *
0425  * @return: the ib_pd protection domain pointer on success, otherwise errno.
0426  */
0427 int pvrdma_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
0428 {
0429     struct ib_device *ibdev = ibpd->device;
0430     struct pvrdma_pd *pd = to_vpd(ibpd);
0431     struct pvrdma_dev *dev = to_vdev(ibdev);
0432     union pvrdma_cmd_req req = {};
0433     union pvrdma_cmd_resp rsp = {};
0434     struct pvrdma_cmd_create_pd *cmd = &req.create_pd;
0435     struct pvrdma_cmd_create_pd_resp *resp = &rsp.create_pd_resp;
0436     struct pvrdma_alloc_pd_resp pd_resp = {0};
0437     int ret;
0438     struct pvrdma_ucontext *context = rdma_udata_to_drv_context(
0439         udata, struct pvrdma_ucontext, ibucontext);
0440
0441     /* Check allowed max pds */
0442     if (!atomic_add_unless(&dev->num_pds, 1, dev->dsr->caps.max_pd))
0443         return -ENOMEM;
0444
0445     cmd->hdr.cmd = PVRDMA_CMD_CREATE_PD;
0446     cmd->ctx_handle = context ? context->ctx_handle : 0;
0447     ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_PD_RESP);
0448     if (ret < 0) {
0449         dev_warn(&dev->pdev->dev,
0450              "failed to allocate protection domain, error: %d\n",
0451              ret);
0452         goto err;
0453     }
0454
0455     pd->privileged = !udata;
0456     pd->pd_handle = resp->pd_handle;
0457     pd->pdn = resp->pd_handle;
0458     pd_resp.pdn = resp->pd_handle;
0459
0460     if (udata) {
0461         if (ib_copy_to_udata(udata, &pd_resp, sizeof(pd_resp))) {
0462             dev_warn(&dev->pdev->dev,
0463                  "failed to copy back protection domain\n");
0464             pvrdma_dealloc_pd(&pd->ibpd, udata);
0465             return -EFAULT;
0466         }
0467     }
0468
0469     /* u32 pd handle */
0470     return 0;
0471
0472 err:
0473     atomic_dec(&dev->num_pds);
0474     return ret;
0475 }
0476
0477 /**
0478  * pvrdma_dealloc_pd - deallocate protection domain
0479  * @pd: the protection domain to be released
0480  * @udata: user data or null for kernel object
0481  *
0482  * @return: Always 0
0483  */
0484 int pvrdma_dealloc_pd(struct ib_pd *pd, struct ib_udata *udata)
0485 {
0486     struct pvrdma_dev *dev = to_vdev(pd->device);
0487     union pvrdma_cmd_req req = {};
0488     struct pvrdma_cmd_destroy_pd *cmd = &req.destroy_pd;
0489     int ret;
0490
0491     cmd->hdr.cmd = PVRDMA_CMD_DESTROY_PD;
0492     cmd->pd_handle = to_vpd(pd)->pd_handle;
0493
0494     ret = pvrdma_cmd_post(dev, &req, NULL, 0);
0495     if (ret)
0496         dev_warn(&dev->pdev->dev,
0497              "could not dealloc protection domain, error: %d\n",
0498              ret);
0499
0500     atomic_dec(&dev->num_pds);
0501     return 0;
0502 }
0503
0504 /**
0505  * pvrdma_create_ah - create an address handle
0506  * @ibah: the IB address handle
0507  * @init_attr: the attributes of the AH
0508  * @udata: pointer to user data
0509  *
0510  * @return: 0 on success, otherwise errno.
0511  */
0512 int pvrdma_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
0513              struct ib_udata *udata)
0514 {
0515     struct rdma_ah_attr *ah_attr = init_attr->ah_attr;
0516     struct pvrdma_dev *dev = to_vdev(ibah->device);
0517     struct pvrdma_ah *ah = to_vah(ibah);
0518     const struct ib_global_route *grh;
0519     u32 port_num = rdma_ah_get_port_num(ah_attr);
0520
0521     if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
0522         return -EINVAL;
0523
0524     grh = rdma_ah_read_grh(ah_attr);
0525     if ((ah_attr->type != RDMA_AH_ATTR_TYPE_ROCE)  ||
0526         rdma_is_multicast_addr((struct in6_addr *)grh->dgid.raw))
0527         return -EINVAL;
0528
0529     if (!atomic_add_unless(&dev->num_ahs, 1, dev->dsr->caps.max_ah))
0530         return -ENOMEM;
0531
0532     ah->av.port_pd = to_vpd(ibah->pd)->pd_handle | (port_num << 24);
0533     ah->av.src_path_bits = rdma_ah_get_path_bits(ah_attr);
0534     ah->av.src_path_bits |= 0x80;
0535     ah->av.gid_index = grh->sgid_index;
0536     ah->av.hop_limit = grh->hop_limit;
0537     ah->av.sl_tclass_flowlabel = (grh->traffic_class << 20) |
0538                       grh->flow_label;
0539     memcpy(ah->av.dgid, grh->dgid.raw, 16);
0540     memcpy(ah->av.dmac, ah_attr->roce.dmac, ETH_ALEN);
0541
0542     return 0;
0543 }
0544
0545 /**
0546  * pvrdma_destroy_ah - destroy an address handle
0547  * @ah: the address handle to destroyed
0548  * @flags: destroy address handle flags (see enum rdma_destroy_ah_flags)
0549  *
0550  */
0551 int pvrdma_destroy_ah(struct ib_ah *ah, u32 flags)
0552 {
0553     struct pvrdma_dev *dev = to_vdev(ah->device);
0554
0555     atomic_dec(&dev->num_ahs);
0556     return 0;
0557 }