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_send_sge = dev->dsr->caps.max_sge; 86 props->max_recv_sge = dev->dsr->caps.max_sge; 87 props->max_sge_rd = PVRDMA_GET_CAP(dev, dev->dsr->caps.max_sge, 88 dev->dsr->caps.max_sge_rd); 89 props->max_srq = dev->dsr->caps.max_srq; 90 props->max_srq_wr = dev->dsr->caps.max_srq_wr; 91 props->max_srq_sge = dev->dsr->caps.max_srq_sge; 92 props->max_cq = dev->dsr->caps.max_cq; 93 props->max_cqe = dev->dsr->caps.max_cqe; 94 props->max_mr = dev->dsr->caps.max_mr; 95 props->max_pd = dev->dsr->caps.max_pd; 96 props->max_qp_rd_atom = dev->dsr->caps.max_qp_rd_atom; 97 props->max_qp_init_rd_atom = dev->dsr->caps.max_qp_init_rd_atom; 98 props->atomic_cap = 99 dev->dsr->caps.atomic_ops & 100 (PVRDMA_ATOMIC_OP_COMP_SWAP | PVRDMA_ATOMIC_OP_FETCH_ADD) ? 101 IB_ATOMIC_HCA : IB_ATOMIC_NONE; 102 props->masked_atomic_cap = props->atomic_cap; 103 props->max_ah = dev->dsr->caps.max_ah; 104 props->max_pkeys = dev->dsr->caps.max_pkeys; 105 props->local_ca_ack_delay = dev->dsr->caps.local_ca_ack_delay; 106 if ((dev->dsr->caps.bmme_flags & PVRDMA_BMME_FLAG_LOCAL_INV) && 107 (dev->dsr->caps.bmme_flags & PVRDMA_BMME_FLAG_REMOTE_INV) && 108 (dev->dsr->caps.bmme_flags & PVRDMA_BMME_FLAG_FAST_REG_WR)) { 109 props->device_cap_flags |= IB_DEVICE_MEM_MGT_EXTENSIONS; 110 props->max_fast_reg_page_list_len = PVRDMA_GET_CAP(dev, 111 PVRDMA_MAX_FAST_REG_PAGES, 112 dev->dsr->caps.max_fast_reg_page_list_len); 113 } 114 115 props->device_cap_flags |= IB_DEVICE_PORT_ACTIVE_EVENT | 116 IB_DEVICE_RC_RNR_NAK_GEN; 117 118 return 0; 119 } 120 121 /** 122 * pvrdma_query_port - query device port attributes 123 * @ibdev: the device to query 124 * @port: the port number 125 * @props: the device properties 126 * 127 * @return: 0 on success, otherwise negative errno 128 */ 129 int pvrdma_query_port(struct ib_device *ibdev, u8 port, 130 struct ib_port_attr *props) 131 { 132 struct pvrdma_dev *dev = to_vdev(ibdev); 133 union pvrdma_cmd_req req; 134 union pvrdma_cmd_resp rsp; 135 struct pvrdma_cmd_query_port *cmd = &req.query_port; 136 struct pvrdma_cmd_query_port_resp *resp = &rsp.query_port_resp; 137 int err; 138 139 memset(cmd, 0, sizeof(*cmd)); 140 cmd->hdr.cmd = PVRDMA_CMD_QUERY_PORT; 141 cmd->port_num = port; 142 143 err = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_PORT_RESP); 144 if (err < 0) { 145 dev_warn(&dev->pdev->dev, 146 "could not query port, error: %d\n", err); 147 return err; 148 } 149 150 /* props being zeroed by the caller, avoid zeroing it here */ 151 152 props->state = pvrdma_port_state_to_ib(resp->attrs.state); 153 props->max_mtu = pvrdma_mtu_to_ib(resp->attrs.max_mtu); 154 props->active_mtu = pvrdma_mtu_to_ib(resp->attrs.active_mtu); 155 props->gid_tbl_len = resp->attrs.gid_tbl_len; 156 props->port_cap_flags = 157 pvrdma_port_cap_flags_to_ib(resp->attrs.port_cap_flags); 158 props->port_cap_flags |= IB_PORT_CM_SUP; 159 props->ip_gids = true; 160 props->max_msg_sz = resp->attrs.max_msg_sz; 161 props->bad_pkey_cntr = resp->attrs.bad_pkey_cntr; 162 props->qkey_viol_cntr = resp->attrs.qkey_viol_cntr; 163 props->pkey_tbl_len = resp->attrs.pkey_tbl_len; 164 props->lid = resp->attrs.lid; 165 props->sm_lid = resp->attrs.sm_lid; 166 props->lmc = resp->attrs.lmc; 167 props->max_vl_num = resp->attrs.max_vl_num; 168 props->sm_sl = resp->attrs.sm_sl; 169 props->subnet_timeout = resp->attrs.subnet_timeout; 170 props->init_type_reply = resp->attrs.init_type_reply; 171 props->active_width = pvrdma_port_width_to_ib(resp->attrs.active_width); 172 props->active_speed = pvrdma_port_speed_to_ib(resp->attrs.active_speed); 173 props->phys_state = resp->attrs.phys_state; 174 175 return 0; 176 } 177 178 /** 179 * pvrdma_query_gid - query device gid 180 * @ibdev: the device to query 181 * @port: the port number 182 * @index: the index 183 * @gid: the device gid value 184 * 185 * @return: 0 on success, otherwise negative errno 186 */ 187 int pvrdma_query_gid(struct ib_device *ibdev, u8 port, int index, 188 union ib_gid *gid) 189 { 190 struct pvrdma_dev *dev = to_vdev(ibdev); 191 192 if (index >= dev->dsr->caps.gid_tbl_len) 193 return -EINVAL; 194 195 memcpy(gid, &dev->sgid_tbl[index], sizeof(union ib_gid)); 196 197 return 0; 198 } 199 200 /** 201 * pvrdma_query_pkey - query device port's P_Key table 202 * @ibdev: the device to query 203 * @port: the port number 204 * @index: the index 205 * @pkey: the device P_Key value 206 * 207 * @return: 0 on success, otherwise negative errno 208 */ 209 int pvrdma_query_pkey(struct ib_device *ibdev, u8 port, u16 index, 210 u16 *pkey) 211 { 212 int err = 0; 213 union pvrdma_cmd_req req; 214 union pvrdma_cmd_resp rsp; 215 struct pvrdma_cmd_query_pkey *cmd = &req.query_pkey; 216 217 memset(cmd, 0, sizeof(*cmd)); 218 cmd->hdr.cmd = PVRDMA_CMD_QUERY_PKEY; 219 cmd->port_num = port; 220 cmd->index = index; 221 222 err = pvrdma_cmd_post(to_vdev(ibdev), &req, &rsp, 223 PVRDMA_CMD_QUERY_PKEY_RESP); 224 if (err < 0) { 225 dev_warn(&to_vdev(ibdev)->pdev->dev, 226 "could not query pkey, error: %d\n", err); 227 return err; 228 } 229 230 *pkey = rsp.query_pkey_resp.pkey; 231 232 return 0; 233 } 234 235 enum rdma_link_layer pvrdma_port_link_layer(struct ib_device *ibdev, 236 u8 port) 237 { 238 return IB_LINK_LAYER_ETHERNET; 239 } 240 241 int pvrdma_modify_device(struct ib_device *ibdev, int mask, 242 struct ib_device_modify *props) 243 { 244 unsigned long flags; 245 246 if (mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID | 247 IB_DEVICE_MODIFY_NODE_DESC)) { 248 dev_warn(&to_vdev(ibdev)->pdev->dev, 249 "unsupported device modify mask %#x\n", mask); 250 return -EOPNOTSUPP; 251 } 252 253 if (mask & IB_DEVICE_MODIFY_NODE_DESC) { 254 spin_lock_irqsave(&to_vdev(ibdev)->desc_lock, flags); 255 memcpy(ibdev->node_desc, props->node_desc, 64); 256 spin_unlock_irqrestore(&to_vdev(ibdev)->desc_lock, flags); 257 } 258 259 if (mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID) { 260 mutex_lock(&to_vdev(ibdev)->port_mutex); 261 to_vdev(ibdev)->sys_image_guid = 262 cpu_to_be64(props->sys_image_guid); 263 mutex_unlock(&to_vdev(ibdev)->port_mutex); 264 } 265 266 return 0; 267 } 268 269 /** 270 * pvrdma_modify_port - modify device port attributes 271 * @ibdev: the device to modify 272 * @port: the port number 273 * @mask: attributes to modify 274 * @props: the device properties 275 * 276 * @return: 0 on success, otherwise negative errno 277 */ 278 int pvrdma_modify_port(struct ib_device *ibdev, u8 port, int mask, 279 struct ib_port_modify *props) 280 { 281 struct ib_port_attr attr; 282 struct pvrdma_dev *vdev = to_vdev(ibdev); 283 int ret; 284 285 if (mask & ~IB_PORT_SHUTDOWN) { 286 dev_warn(&vdev->pdev->dev, 287 "unsupported port modify mask %#x\n", mask); 288 return -EOPNOTSUPP; 289 } 290 291 mutex_lock(&vdev->port_mutex); 292 ret = ib_query_port(ibdev, port, &attr); 293 if (ret) 294 goto out; 295 296 vdev->port_cap_mask |= props->set_port_cap_mask; 297 vdev->port_cap_mask &= ~props->clr_port_cap_mask; 298 299 if (mask & IB_PORT_SHUTDOWN) 300 vdev->ib_active = false; 301 302 out: 303 mutex_unlock(&vdev->port_mutex); 304 return ret; 305 } 306 307 /** 308 * pvrdma_alloc_ucontext - allocate ucontext 309 * @ibdev: the IB device 310 * @udata: user data 311 * 312 * @return: the ib_ucontext pointer on success, otherwise errno. 313 */ 314 struct ib_ucontext *pvrdma_alloc_ucontext(struct ib_device *ibdev, 315 struct ib_udata *udata) 316 { 317 struct pvrdma_dev *vdev = to_vdev(ibdev); 318 struct pvrdma_ucontext *context; 319 union pvrdma_cmd_req req; 320 union pvrdma_cmd_resp rsp; 321 struct pvrdma_cmd_create_uc *cmd = &req.create_uc; 322 struct pvrdma_cmd_create_uc_resp *resp = &rsp.create_uc_resp; 323 struct pvrdma_alloc_ucontext_resp uresp = {0}; 324 int ret; 325 void *ptr; 326 327 if (!vdev->ib_active) 328 return ERR_PTR(-EAGAIN); 329 330 context = kmalloc(sizeof(*context), GFP_KERNEL); 331 if (!context) 332 return ERR_PTR(-ENOMEM); 333 334 context->dev = vdev; 335 ret = pvrdma_uar_alloc(vdev, &context->uar); 336 if (ret) { 337 kfree(context); 338 return ERR_PTR(-ENOMEM); 339 } 340 341 /* get ctx_handle from host */ 342 memset(cmd, 0, sizeof(*cmd)); 343 cmd->pfn = context->uar.pfn; 344 cmd->hdr.cmd = PVRDMA_CMD_CREATE_UC; 345 ret = pvrdma_cmd_post(vdev, &req, &rsp, PVRDMA_CMD_CREATE_UC_RESP); 346 if (ret < 0) { 347 dev_warn(&vdev->pdev->dev, 348 "could not create ucontext, error: %d\n", ret); 349 ptr = ERR_PTR(ret); 350 goto err; 351 } 352 353 context->ctx_handle = resp->ctx_handle; 354 355 /* copy back to user */ 356 uresp.qp_tab_size = vdev->dsr->caps.max_qp; 357 ret = ib_copy_to_udata(udata, &uresp, sizeof(uresp)); 358 if (ret) { 359 pvrdma_uar_free(vdev, &context->uar); 360 context->ibucontext.device = ibdev; 361 pvrdma_dealloc_ucontext(&context->ibucontext); 362 return ERR_PTR(-EFAULT); 363 } 364 365 return &context->ibucontext; 366 367 err: 368 pvrdma_uar_free(vdev, &context->uar); 369 kfree(context); 370 return ptr; 371 } 372 373 /** 374 * pvrdma_dealloc_ucontext - deallocate ucontext 375 * @ibcontext: the ucontext 376 * 377 * @return: 0 on success, otherwise errno. 378 */ 379 int pvrdma_dealloc_ucontext(struct ib_ucontext *ibcontext) 380 { 381 struct pvrdma_ucontext *context = to_vucontext(ibcontext); 382 union pvrdma_cmd_req req; 383 struct pvrdma_cmd_destroy_uc *cmd = &req.destroy_uc; 384 int ret; 385 386 memset(cmd, 0, sizeof(*cmd)); 387 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_UC; 388 cmd->ctx_handle = context->ctx_handle; 389 390 ret = pvrdma_cmd_post(context->dev, &req, NULL, 0); 391 if (ret < 0) 392 dev_warn(&context->dev->pdev->dev, 393 "destroy ucontext failed, error: %d\n", ret); 394 395 /* Free the UAR even if the device command failed */ 396 pvrdma_uar_free(to_vdev(ibcontext->device), &context->uar); 397 kfree(context); 398 399 return ret; 400 } 401 402 /** 403 * pvrdma_mmap - create mmap region 404 * @ibcontext: the user context 405 * @vma: the VMA 406 * 407 * @return: 0 on success, otherwise errno. 408 */ 409 int pvrdma_mmap(struct ib_ucontext *ibcontext, struct vm_area_struct *vma) 410 { 411 struct pvrdma_ucontext *context = to_vucontext(ibcontext); 412 unsigned long start = vma->vm_start; 413 unsigned long size = vma->vm_end - vma->vm_start; 414 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; 415 416 dev_dbg(&context->dev->pdev->dev, "create mmap region\n"); 417 418 if ((size != PAGE_SIZE) || (offset & ~PAGE_MASK)) { 419 dev_warn(&context->dev->pdev->dev, 420 "invalid params for mmap region\n"); 421 return -EINVAL; 422 } 423 424 /* Map UAR to kernel space, VM_LOCKED? */ 425 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; 426 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 427 if (io_remap_pfn_range(vma, start, context->uar.pfn, size, 428 vma->vm_page_prot)) 429 return -EAGAIN; 430 431 return 0; 432 } 433 434 /** 435 * pvrdma_alloc_pd - allocate protection domain 436 * @ibdev: the IB device 437 * @context: user context 438 * @udata: user data 439 * 440 * @return: the ib_pd protection domain pointer on success, otherwise errno. 441 */ 442 struct ib_pd *pvrdma_alloc_pd(struct ib_device *ibdev, 443 struct ib_ucontext *context, 444 struct ib_udata *udata) 445 { 446 struct pvrdma_pd *pd; 447 struct pvrdma_dev *dev = to_vdev(ibdev); 448 union pvrdma_cmd_req req; 449 union pvrdma_cmd_resp rsp; 450 struct pvrdma_cmd_create_pd *cmd = &req.create_pd; 451 struct pvrdma_cmd_create_pd_resp *resp = &rsp.create_pd_resp; 452 struct pvrdma_alloc_pd_resp pd_resp = {0}; 453 int ret; 454 void *ptr; 455 456 /* Check allowed max pds */ 457 if (!atomic_add_unless(&dev->num_pds, 1, dev->dsr->caps.max_pd)) 458 return ERR_PTR(-ENOMEM); 459 460 pd = kmalloc(sizeof(*pd), GFP_KERNEL); 461 if (!pd) { 462 ptr = ERR_PTR(-ENOMEM); 463 goto err; 464 } 465 466 memset(cmd, 0, sizeof(*cmd)); 467 cmd->hdr.cmd = PVRDMA_CMD_CREATE_PD; 468 cmd->ctx_handle = (context) ? to_vucontext(context)->ctx_handle : 0; 469 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_PD_RESP); 470 if (ret < 0) { 471 dev_warn(&dev->pdev->dev, 472 "failed to allocate protection domain, error: %d\n", 473 ret); 474 ptr = ERR_PTR(ret); 475 goto freepd; 476 } 477 478 pd->privileged = !context; 479 pd->pd_handle = resp->pd_handle; 480 pd->pdn = resp->pd_handle; 481 pd_resp.pdn = resp->pd_handle; 482 483 if (context) { 484 if (ib_copy_to_udata(udata, &pd_resp, sizeof(pd_resp))) { 485 dev_warn(&dev->pdev->dev, 486 "failed to copy back protection domain\n"); 487 pvrdma_dealloc_pd(&pd->ibpd); 488 return ERR_PTR(-EFAULT); 489 } 490 } 491 492 /* u32 pd handle */ 493 return &pd->ibpd; 494 495 freepd: 496 kfree(pd); 497 err: 498 atomic_dec(&dev->num_pds); 499 return ptr; 500 } 501 502 /** 503 * pvrdma_dealloc_pd - deallocate protection domain 504 * @pd: the protection domain to be released 505 * 506 * @return: 0 on success, otherwise errno. 507 */ 508 int pvrdma_dealloc_pd(struct ib_pd *pd) 509 { 510 struct pvrdma_dev *dev = to_vdev(pd->device); 511 union pvrdma_cmd_req req; 512 struct pvrdma_cmd_destroy_pd *cmd = &req.destroy_pd; 513 int ret; 514 515 memset(cmd, 0, sizeof(*cmd)); 516 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_PD; 517 cmd->pd_handle = to_vpd(pd)->pd_handle; 518 519 ret = pvrdma_cmd_post(dev, &req, NULL, 0); 520 if (ret) 521 dev_warn(&dev->pdev->dev, 522 "could not dealloc protection domain, error: %d\n", 523 ret); 524 525 kfree(to_vpd(pd)); 526 atomic_dec(&dev->num_pds); 527 528 return 0; 529 } 530 531 /** 532 * pvrdma_create_ah - create an address handle 533 * @pd: the protection domain 534 * @ah_attr: the attributes of the AH 535 * @udata: user data blob 536 * 537 * @return: the ib_ah pointer on success, otherwise errno. 538 */ 539 struct ib_ah *pvrdma_create_ah(struct ib_pd *pd, struct rdma_ah_attr *ah_attr, 540 struct ib_udata *udata) 541 { 542 struct pvrdma_dev *dev = to_vdev(pd->device); 543 struct pvrdma_ah *ah; 544 const struct ib_global_route *grh; 545 u8 port_num = rdma_ah_get_port_num(ah_attr); 546 547 if (!(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH)) 548 return ERR_PTR(-EINVAL); 549 550 grh = rdma_ah_read_grh(ah_attr); 551 if ((ah_attr->type != RDMA_AH_ATTR_TYPE_ROCE) || 552 rdma_is_multicast_addr((struct in6_addr *)grh->dgid.raw)) 553 return ERR_PTR(-EINVAL); 554 555 if (!atomic_add_unless(&dev->num_ahs, 1, dev->dsr->caps.max_ah)) 556 return ERR_PTR(-ENOMEM); 557 558 ah = kzalloc(sizeof(*ah), GFP_KERNEL); 559 if (!ah) { 560 atomic_dec(&dev->num_ahs); 561 return ERR_PTR(-ENOMEM); 562 } 563 564 ah->av.port_pd = to_vpd(pd)->pd_handle | (port_num << 24); 565 ah->av.src_path_bits = rdma_ah_get_path_bits(ah_attr); 566 ah->av.src_path_bits |= 0x80; 567 ah->av.gid_index = grh->sgid_index; 568 ah->av.hop_limit = grh->hop_limit; 569 ah->av.sl_tclass_flowlabel = (grh->traffic_class << 20) | 570 grh->flow_label; 571 memcpy(ah->av.dgid, grh->dgid.raw, 16); 572 memcpy(ah->av.dmac, ah_attr->roce.dmac, ETH_ALEN); 573 574 ah->ibah.device = pd->device; 575 ah->ibah.pd = pd; 576 ah->ibah.uobject = NULL; 577 578 return &ah->ibah; 579 } 580 581 /** 582 * pvrdma_destroy_ah - destroy an address handle 583 * @ah: the address handle to destroyed 584 * 585 * @return: 0 on success. 586 */ 587 int pvrdma_destroy_ah(struct ib_ah *ah) 588 { 589 struct pvrdma_dev *dev = to_vdev(ah->device); 590 591 kfree(to_vah(ah)); 592 atomic_dec(&dev->num_ahs); 593 594 return 0; 595 } 596