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 54 #include "pvrdma.h" 55 56 /** 57 * pvrdma_query_device - query device 58 * @ibdev: the device to query 59 * @props: the device properties 60 * @uhw: user data 61 * 62 * @return: 0 on success, otherwise negative errno 63 */ 64 int pvrdma_query_device(struct ib_device *ibdev, 65 struct ib_device_attr *props, 66 struct ib_udata *uhw) 67 { 68 struct pvrdma_dev *dev = to_vdev(ibdev); 69 70 if (uhw->inlen || uhw->outlen) 71 return -EINVAL; 72 73 memset(props, 0, sizeof(*props)); 74 75 props->fw_ver = dev->dsr->caps.fw_ver; 76 props->sys_image_guid = dev->dsr->caps.sys_image_guid; 77 props->max_mr_size = dev->dsr->caps.max_mr_size; 78 props->page_size_cap = dev->dsr->caps.page_size_cap; 79 props->vendor_id = dev->dsr->caps.vendor_id; 80 props->vendor_part_id = dev->pdev->device; 81 props->hw_ver = dev->dsr->caps.hw_ver; 82 props->max_qp = dev->dsr->caps.max_qp; 83 props->max_qp_wr = dev->dsr->caps.max_qp_wr; 84 props->device_cap_flags = dev->dsr->caps.device_cap_flags; 85 props->max_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 | IB_PORT_IP_BASED_GIDS; 158 props->max_msg_sz = resp->attrs.max_msg_sz; 159 props->bad_pkey_cntr = resp->attrs.bad_pkey_cntr; 160 props->qkey_viol_cntr = resp->attrs.qkey_viol_cntr; 161 props->pkey_tbl_len = resp->attrs.pkey_tbl_len; 162 props->lid = resp->attrs.lid; 163 props->sm_lid = resp->attrs.sm_lid; 164 props->lmc = resp->attrs.lmc; 165 props->max_vl_num = resp->attrs.max_vl_num; 166 props->sm_sl = resp->attrs.sm_sl; 167 props->subnet_timeout = resp->attrs.subnet_timeout; 168 props->init_type_reply = resp->attrs.init_type_reply; 169 props->active_width = pvrdma_port_width_to_ib(resp->attrs.active_width); 170 props->active_speed = pvrdma_port_speed_to_ib(resp->attrs.active_speed); 171 props->phys_state = resp->attrs.phys_state; 172 173 return 0; 174 } 175 176 /** 177 * pvrdma_query_gid - query device gid 178 * @ibdev: the device to query 179 * @port: the port number 180 * @index: the index 181 * @gid: the device gid value 182 * 183 * @return: 0 on success, otherwise negative errno 184 */ 185 int pvrdma_query_gid(struct ib_device *ibdev, u8 port, int index, 186 union ib_gid *gid) 187 { 188 struct pvrdma_dev *dev = to_vdev(ibdev); 189 190 if (index >= dev->dsr->caps.gid_tbl_len) 191 return -EINVAL; 192 193 memcpy(gid, &dev->sgid_tbl[index], sizeof(union ib_gid)); 194 195 return 0; 196 } 197 198 /** 199 * pvrdma_query_pkey - query device port's P_Key table 200 * @ibdev: the device to query 201 * @port: the port number 202 * @index: the index 203 * @pkey: the device P_Key value 204 * 205 * @return: 0 on success, otherwise negative errno 206 */ 207 int pvrdma_query_pkey(struct ib_device *ibdev, u8 port, u16 index, 208 u16 *pkey) 209 { 210 int err = 0; 211 union pvrdma_cmd_req req; 212 union pvrdma_cmd_resp rsp; 213 struct pvrdma_cmd_query_pkey *cmd = &req.query_pkey; 214 215 memset(cmd, 0, sizeof(*cmd)); 216 cmd->hdr.cmd = PVRDMA_CMD_QUERY_PKEY; 217 cmd->port_num = port; 218 cmd->index = index; 219 220 err = pvrdma_cmd_post(to_vdev(ibdev), &req, &rsp, 221 PVRDMA_CMD_QUERY_PKEY_RESP); 222 if (err < 0) { 223 dev_warn(&to_vdev(ibdev)->pdev->dev, 224 "could not query pkey, error: %d\n", err); 225 return err; 226 } 227 228 *pkey = rsp.query_pkey_resp.pkey; 229 230 return 0; 231 } 232 233 enum rdma_link_layer pvrdma_port_link_layer(struct ib_device *ibdev, 234 u8 port) 235 { 236 return IB_LINK_LAYER_ETHERNET; 237 } 238 239 int pvrdma_modify_device(struct ib_device *ibdev, int mask, 240 struct ib_device_modify *props) 241 { 242 unsigned long flags; 243 244 if (mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID | 245 IB_DEVICE_MODIFY_NODE_DESC)) { 246 dev_warn(&to_vdev(ibdev)->pdev->dev, 247 "unsupported device modify mask %#x\n", mask); 248 return -EOPNOTSUPP; 249 } 250 251 if (mask & IB_DEVICE_MODIFY_NODE_DESC) { 252 spin_lock_irqsave(&to_vdev(ibdev)->desc_lock, flags); 253 memcpy(ibdev->node_desc, props->node_desc, 64); 254 spin_unlock_irqrestore(&to_vdev(ibdev)->desc_lock, flags); 255 } 256 257 if (mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID) { 258 mutex_lock(&to_vdev(ibdev)->port_mutex); 259 to_vdev(ibdev)->sys_image_guid = 260 cpu_to_be64(props->sys_image_guid); 261 mutex_unlock(&to_vdev(ibdev)->port_mutex); 262 } 263 264 return 0; 265 } 266 267 /** 268 * pvrdma_modify_port - modify device port attributes 269 * @ibdev: the device to modify 270 * @port: the port number 271 * @mask: attributes to modify 272 * @props: the device properties 273 * 274 * @return: 0 on success, otherwise negative errno 275 */ 276 int pvrdma_modify_port(struct ib_device *ibdev, u8 port, int mask, 277 struct ib_port_modify *props) 278 { 279 struct ib_port_attr attr; 280 struct pvrdma_dev *vdev = to_vdev(ibdev); 281 int ret; 282 283 if (mask & ~IB_PORT_SHUTDOWN) { 284 dev_warn(&vdev->pdev->dev, 285 "unsupported port modify mask %#x\n", mask); 286 return -EOPNOTSUPP; 287 } 288 289 mutex_lock(&vdev->port_mutex); 290 ret = ib_query_port(ibdev, port, &attr); 291 if (ret) 292 goto out; 293 294 vdev->port_cap_mask |= props->set_port_cap_mask; 295 vdev->port_cap_mask &= ~props->clr_port_cap_mask; 296 297 if (mask & IB_PORT_SHUTDOWN) 298 vdev->ib_active = false; 299 300 out: 301 mutex_unlock(&vdev->port_mutex); 302 return ret; 303 } 304 305 /** 306 * pvrdma_alloc_ucontext - allocate ucontext 307 * @ibdev: the IB device 308 * @udata: user data 309 * 310 * @return: the ib_ucontext pointer on success, otherwise errno. 311 */ 312 struct ib_ucontext *pvrdma_alloc_ucontext(struct ib_device *ibdev, 313 struct ib_udata *udata) 314 { 315 struct pvrdma_dev *vdev = to_vdev(ibdev); 316 struct pvrdma_ucontext *context; 317 union pvrdma_cmd_req req; 318 union pvrdma_cmd_resp rsp; 319 struct pvrdma_cmd_create_uc *cmd = &req.create_uc; 320 struct pvrdma_cmd_create_uc_resp *resp = &rsp.create_uc_resp; 321 struct pvrdma_alloc_ucontext_resp uresp = {0}; 322 int ret; 323 void *ptr; 324 325 if (!vdev->ib_active) 326 return ERR_PTR(-EAGAIN); 327 328 context = kmalloc(sizeof(*context), GFP_KERNEL); 329 if (!context) 330 return ERR_PTR(-ENOMEM); 331 332 context->dev = vdev; 333 ret = pvrdma_uar_alloc(vdev, &context->uar); 334 if (ret) { 335 kfree(context); 336 return ERR_PTR(-ENOMEM); 337 } 338 339 /* get ctx_handle from host */ 340 memset(cmd, 0, sizeof(*cmd)); 341 cmd->pfn = context->uar.pfn; 342 cmd->hdr.cmd = PVRDMA_CMD_CREATE_UC; 343 ret = pvrdma_cmd_post(vdev, &req, &rsp, PVRDMA_CMD_CREATE_UC_RESP); 344 if (ret < 0) { 345 dev_warn(&vdev->pdev->dev, 346 "could not create ucontext, error: %d\n", ret); 347 ptr = ERR_PTR(ret); 348 goto err; 349 } 350 351 context->ctx_handle = resp->ctx_handle; 352 353 /* copy back to user */ 354 uresp.qp_tab_size = vdev->dsr->caps.max_qp; 355 ret = ib_copy_to_udata(udata, &uresp, sizeof(uresp)); 356 if (ret) { 357 pvrdma_uar_free(vdev, &context->uar); 358 context->ibucontext.device = ibdev; 359 pvrdma_dealloc_ucontext(&context->ibucontext); 360 return ERR_PTR(-EFAULT); 361 } 362 363 return &context->ibucontext; 364 365 err: 366 pvrdma_uar_free(vdev, &context->uar); 367 kfree(context); 368 return ptr; 369 } 370 371 /** 372 * pvrdma_dealloc_ucontext - deallocate ucontext 373 * @ibcontext: the ucontext 374 * 375 * @return: 0 on success, otherwise errno. 376 */ 377 int pvrdma_dealloc_ucontext(struct ib_ucontext *ibcontext) 378 { 379 struct pvrdma_ucontext *context = to_vucontext(ibcontext); 380 union pvrdma_cmd_req req; 381 struct pvrdma_cmd_destroy_uc *cmd = &req.destroy_uc; 382 int ret; 383 384 memset(cmd, 0, sizeof(*cmd)); 385 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_UC; 386 cmd->ctx_handle = context->ctx_handle; 387 388 ret = pvrdma_cmd_post(context->dev, &req, NULL, 0); 389 if (ret < 0) 390 dev_warn(&context->dev->pdev->dev, 391 "destroy ucontext failed, error: %d\n", ret); 392 393 /* Free the UAR even if the device command failed */ 394 pvrdma_uar_free(to_vdev(ibcontext->device), &context->uar); 395 kfree(context); 396 397 return ret; 398 } 399 400 /** 401 * pvrdma_mmap - create mmap region 402 * @ibcontext: the user context 403 * @vma: the VMA 404 * 405 * @return: 0 on success, otherwise errno. 406 */ 407 int pvrdma_mmap(struct ib_ucontext *ibcontext, struct vm_area_struct *vma) 408 { 409 struct pvrdma_ucontext *context = to_vucontext(ibcontext); 410 unsigned long start = vma->vm_start; 411 unsigned long size = vma->vm_end - vma->vm_start; 412 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; 413 414 dev_dbg(&context->dev->pdev->dev, "create mmap region\n"); 415 416 if ((size != PAGE_SIZE) || (offset & ~PAGE_MASK)) { 417 dev_warn(&context->dev->pdev->dev, 418 "invalid params for mmap region\n"); 419 return -EINVAL; 420 } 421 422 /* Map UAR to kernel space, VM_LOCKED? */ 423 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; 424 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 425 if (io_remap_pfn_range(vma, start, context->uar.pfn, size, 426 vma->vm_page_prot)) 427 return -EAGAIN; 428 429 return 0; 430 } 431 432 /** 433 * pvrdma_alloc_pd - allocate protection domain 434 * @ibdev: the IB device 435 * @context: user context 436 * @udata: user data 437 * 438 * @return: the ib_pd protection domain pointer on success, otherwise errno. 439 */ 440 struct ib_pd *pvrdma_alloc_pd(struct ib_device *ibdev, 441 struct ib_ucontext *context, 442 struct ib_udata *udata) 443 { 444 struct pvrdma_pd *pd; 445 struct pvrdma_dev *dev = to_vdev(ibdev); 446 union pvrdma_cmd_req req; 447 union pvrdma_cmd_resp rsp; 448 struct pvrdma_cmd_create_pd *cmd = &req.create_pd; 449 struct pvrdma_cmd_create_pd_resp *resp = &rsp.create_pd_resp; 450 struct pvrdma_alloc_pd_resp pd_resp = {0}; 451 int ret; 452 void *ptr; 453 454 /* Check allowed max pds */ 455 if (!atomic_add_unless(&dev->num_pds, 1, dev->dsr->caps.max_pd)) 456 return ERR_PTR(-ENOMEM); 457 458 pd = kmalloc(sizeof(*pd), GFP_KERNEL); 459 if (!pd) { 460 ptr = ERR_PTR(-ENOMEM); 461 goto err; 462 } 463 464 memset(cmd, 0, sizeof(*cmd)); 465 cmd->hdr.cmd = PVRDMA_CMD_CREATE_PD; 466 cmd->ctx_handle = (context) ? to_vucontext(context)->ctx_handle : 0; 467 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_PD_RESP); 468 if (ret < 0) { 469 dev_warn(&dev->pdev->dev, 470 "failed to allocate protection domain, error: %d\n", 471 ret); 472 ptr = ERR_PTR(ret); 473 goto freepd; 474 } 475 476 pd->privileged = !context; 477 pd->pd_handle = resp->pd_handle; 478 pd->pdn = resp->pd_handle; 479 pd_resp.pdn = resp->pd_handle; 480 481 if (context) { 482 if (ib_copy_to_udata(udata, &pd_resp, sizeof(pd_resp))) { 483 dev_warn(&dev->pdev->dev, 484 "failed to copy back protection domain\n"); 485 pvrdma_dealloc_pd(&pd->ibpd); 486 return ERR_PTR(-EFAULT); 487 } 488 } 489 490 /* u32 pd handle */ 491 return &pd->ibpd; 492 493 freepd: 494 kfree(pd); 495 err: 496 atomic_dec(&dev->num_pds); 497 return ptr; 498 } 499 500 /** 501 * pvrdma_dealloc_pd - deallocate protection domain 502 * @pd: the protection domain to be released 503 * 504 * @return: 0 on success, otherwise errno. 505 */ 506 int pvrdma_dealloc_pd(struct ib_pd *pd) 507 { 508 struct pvrdma_dev *dev = to_vdev(pd->device); 509 union pvrdma_cmd_req req; 510 struct pvrdma_cmd_destroy_pd *cmd = &req.destroy_pd; 511 int ret; 512 513 memset(cmd, 0, sizeof(*cmd)); 514 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_PD; 515 cmd->pd_handle = to_vpd(pd)->pd_handle; 516 517 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 518 if (ret) 519 dev_warn(&dev->pdev->dev, 520 "could not dealloc protection domain, error: %d\n", 521 ret); 522 523 kfree(to_vpd(pd)); 524 atomic_dec(&dev->num_pds); 525 526 return 0; 527 } 528 529 /** 530 * pvrdma_create_ah - create an address handle 531 * @pd: the protection domain 532 * @ah_attr: the attributes of the AH 533 * @udata: user data blob 534 * 535 * @return: the ib_ah pointer on success, otherwise errno. 536 */ 537 struct ib_ah *pvrdma_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr, 538 struct ib_udata *udata) 539 { 540 struct pvrdma_dev *dev = to_vdev(pd->device); 541 struct pvrdma_ah *ah; 542 const struct ib_global_route *grh; 543 u8 port_num = rdma_ah_get_port_num(ah_attr); 544 545 if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH)) 546 return ERR_PTR(-EINVAL); 547 548 grh = rdma_ah_read_grh(ah_attr); 549 if ((ah_attr->type != RDMA_AH_ATTR_TYPE_ROCE) || 550 rdma_is_multicast_addr((struct in6_addr *)grh->dgid.raw)) 551 return ERR_PTR(-EINVAL); 552 553 if (!atomic_add_unless(&dev->num_ahs, 1, dev->dsr->caps.max_ah)) 554 return ERR_PTR(-ENOMEM); 555 556 ah = kzalloc(sizeof(*ah), GFP_KERNEL); 557 if (!ah) { 558 atomic_dec(&dev->num_ahs); 559 return ERR_PTR(-ENOMEM); 560 } 561 562 ah->av.port_pd = to_vpd(pd)->pd_handle | (port_num << 24); 563 ah->av.src_path_bits = rdma_ah_get_path_bits(ah_attr); 564 ah->av.src_path_bits |= 0x80; 565 ah->av.gid_index = grh->sgid_index; 566 ah->av.hop_limit = grh->hop_limit; 567 ah->av.sl_tclass_flowlabel = (grh->traffic_class << 20) | 568 grh->flow_label; 569 memcpy(ah->av.dgid, grh->dgid.raw, 16); 570 memcpy(ah->av.dmac, ah_attr->roce.dmac, ETH_ALEN); 571 572 ah->ibah.device = pd->device; 573 ah->ibah.pd = pd; 574 ah->ibah.uobject = NULL; 575 576 return &ah->ibah; 577 } 578 579 /** 580 * pvrdma_destroy_ah - destroy an address handle 581 * @ah: the address handle to destroyed 582 * 583 * @return: 0 on success. 584 */ 585 int pvrdma_destroy_ah(struct ib_ah *ah) 586 { 587 struct pvrdma_dev *dev = to_vdev(ah->device); 588 589 kfree(to_vah(ah)); 590 atomic_dec(&dev->num_ahs); 591 592 return 0; 593 } 594