1 /* 2 * Copyright (c) 2004 Mellanox Technologies Ltd. All rights reserved. 3 * Copyright (c) 2004 Infinicon Corporation. All rights reserved. 4 * Copyright (c) 2004 Intel Corporation. All rights reserved. 5 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 6 * Copyright (c) 2004 Voltaire Corporation. All rights reserved. 7 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 8 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. 9 * 10 * This software is available to you under a choice of one of two 11 * licenses. You may choose to be licensed under the terms of the GNU 12 * General Public License (GPL) Version 2, available from the file 13 * COPYING in the main directory of this source tree, or the 14 * OpenIB.org BSD license below: 15 * 16 * Redistribution and use in source and binary forms, with or 17 * without modification, are permitted provided that the following 18 * conditions are met: 19 * 20 * - Redistributions of source code must retain the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer. 23 * 24 * - Redistributions in binary form must reproduce the above 25 * copyright notice, this list of conditions and the following 26 * disclaimer in the documentation and/or other materials 27 * provided with the distribution. 28 * 29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 30 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 32 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 33 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 34 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 35 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 36 * SOFTWARE. 37 */ 38 39 #include <linux/errno.h> 40 #include <linux/err.h> 41 #include <linux/export.h> 42 #include <linux/string.h> 43 #include <linux/slab.h> 44 #include <linux/in.h> 45 #include <linux/in6.h> 46 #include <net/addrconf.h> 47 48 #include <rdma/ib_verbs.h> 49 #include <rdma/ib_cache.h> 50 #include <rdma/ib_addr.h> 51 #include <rdma/rw.h> 52 53 #include "core_priv.h" 54 55 static const char * const ib_events[] = { 56 [IB_EVENT_CQ_ERR] = "CQ error", 57 [IB_EVENT_QP_FATAL] = "QP fatal error", 58 [IB_EVENT_QP_REQ_ERR] = "QP request error", 59 [IB_EVENT_QP_ACCESS_ERR] = "QP access error", 60 [IB_EVENT_COMM_EST] = "communication established", 61 [IB_EVENT_SQ_DRAINED] = "send queue drained", 62 [IB_EVENT_PATH_MIG] = "path migration successful", 63 [IB_EVENT_PATH_MIG_ERR] = "path migration error", 64 [IB_EVENT_DEVICE_FATAL] = "device fatal error", 65 [IB_EVENT_PORT_ACTIVE] = "port active", 66 [IB_EVENT_PORT_ERR] = "port error", 67 [IB_EVENT_LID_CHANGE] = "LID change", 68 [IB_EVENT_PKEY_CHANGE] = "P_key change", 69 [IB_EVENT_SM_CHANGE] = "SM change", 70 [IB_EVENT_SRQ_ERR] = "SRQ error", 71 [IB_EVENT_SRQ_LIMIT_REACHED] = "SRQ limit reached", 72 [IB_EVENT_QP_LAST_WQE_REACHED] = "last WQE reached", 73 [IB_EVENT_CLIENT_REREGISTER] = "client reregister", 74 [IB_EVENT_GID_CHANGE] = "GID changed", 75 }; 76 77 const char *__attribute_const__ ib_event_msg(enum ib_event_type event) 78 { 79 size_t index = event; 80 81 return (index < ARRAY_SIZE(ib_events) && ib_events[index]) ? 82 ib_events[index] : "unrecognized event"; 83 } 84 EXPORT_SYMBOL(ib_event_msg); 85 86 static const char * const wc_statuses[] = { 87 [IB_WC_SUCCESS] = "success", 88 [IB_WC_LOC_LEN_ERR] = "local length error", 89 [IB_WC_LOC_QP_OP_ERR] = "local QP operation error", 90 [IB_WC_LOC_EEC_OP_ERR] = "local EE context operation error", 91 [IB_WC_LOC_PROT_ERR] = "local protection error", 92 [IB_WC_WR_FLUSH_ERR] = "WR flushed", 93 [IB_WC_MW_BIND_ERR] = "memory management operation error", 94 [IB_WC_BAD_RESP_ERR] = "bad response error", 95 [IB_WC_LOC_ACCESS_ERR] = "local access error", 96 [IB_WC_REM_INV_REQ_ERR] = "invalid request error", 97 [IB_WC_REM_ACCESS_ERR] = "remote access error", 98 [IB_WC_REM_OP_ERR] = "remote operation error", 99 [IB_WC_RETRY_EXC_ERR] = "transport retry counter exceeded", 100 [IB_WC_RNR_RETRY_EXC_ERR] = "RNR retry counter exceeded", 101 [IB_WC_LOC_RDD_VIOL_ERR] = "local RDD violation error", 102 [IB_WC_REM_INV_RD_REQ_ERR] = "remote invalid RD request", 103 [IB_WC_REM_ABORT_ERR] = "operation aborted", 104 [IB_WC_INV_EECN_ERR] = "invalid EE context number", 105 [IB_WC_INV_EEC_STATE_ERR] = "invalid EE context state", 106 [IB_WC_FATAL_ERR] = "fatal error", 107 [IB_WC_RESP_TIMEOUT_ERR] = "response timeout error", 108 [IB_WC_GENERAL_ERR] = "general error", 109 }; 110 111 const char *__attribute_const__ ib_wc_status_msg(enum ib_wc_status status) 112 { 113 size_t index = status; 114 115 return (index < ARRAY_SIZE(wc_statuses) && wc_statuses[index]) ? 116 wc_statuses[index] : "unrecognized status"; 117 } 118 EXPORT_SYMBOL(ib_wc_status_msg); 119 120 __attribute_const__ int ib_rate_to_mult(enum ib_rate rate) 121 { 122 switch (rate) { 123 case IB_RATE_2_5_GBPS: return 1; 124 case IB_RATE_5_GBPS: return 2; 125 case IB_RATE_10_GBPS: return 4; 126 case IB_RATE_20_GBPS: return 8; 127 case IB_RATE_30_GBPS: return 12; 128 case IB_RATE_40_GBPS: return 16; 129 case IB_RATE_60_GBPS: return 24; 130 case IB_RATE_80_GBPS: return 32; 131 case IB_RATE_120_GBPS: return 48; 132 default: return -1; 133 } 134 } 135 EXPORT_SYMBOL(ib_rate_to_mult); 136 137 __attribute_const__ enum ib_rate mult_to_ib_rate(int mult) 138 { 139 switch (mult) { 140 case 1: return IB_RATE_2_5_GBPS; 141 case 2: return IB_RATE_5_GBPS; 142 case 4: return IB_RATE_10_GBPS; 143 case 8: return IB_RATE_20_GBPS; 144 case 12: return IB_RATE_30_GBPS; 145 case 16: return IB_RATE_40_GBPS; 146 case 24: return IB_RATE_60_GBPS; 147 case 32: return IB_RATE_80_GBPS; 148 case 48: return IB_RATE_120_GBPS; 149 default: return IB_RATE_PORT_CURRENT; 150 } 151 } 152 EXPORT_SYMBOL(mult_to_ib_rate); 153 154 __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate) 155 { 156 switch (rate) { 157 case IB_RATE_2_5_GBPS: return 2500; 158 case IB_RATE_5_GBPS: return 5000; 159 case IB_RATE_10_GBPS: return 10000; 160 case IB_RATE_20_GBPS: return 20000; 161 case IB_RATE_30_GBPS: return 30000; 162 case IB_RATE_40_GBPS: return 40000; 163 case IB_RATE_60_GBPS: return 60000; 164 case IB_RATE_80_GBPS: return 80000; 165 case IB_RATE_120_GBPS: return 120000; 166 case IB_RATE_14_GBPS: return 14062; 167 case IB_RATE_56_GBPS: return 56250; 168 case IB_RATE_112_GBPS: return 112500; 169 case IB_RATE_168_GBPS: return 168750; 170 case IB_RATE_25_GBPS: return 25781; 171 case IB_RATE_100_GBPS: return 103125; 172 case IB_RATE_200_GBPS: return 206250; 173 case IB_RATE_300_GBPS: return 309375; 174 default: return -1; 175 } 176 } 177 EXPORT_SYMBOL(ib_rate_to_mbps); 178 179 __attribute_const__ enum rdma_transport_type 180 rdma_node_get_transport(enum rdma_node_type node_type) 181 { 182 switch (node_type) { 183 case RDMA_NODE_IB_CA: 184 case RDMA_NODE_IB_SWITCH: 185 case RDMA_NODE_IB_ROUTER: 186 return RDMA_TRANSPORT_IB; 187 case RDMA_NODE_RNIC: 188 return RDMA_TRANSPORT_IWARP; 189 case RDMA_NODE_USNIC: 190 return RDMA_TRANSPORT_USNIC; 191 case RDMA_NODE_USNIC_UDP: 192 return RDMA_TRANSPORT_USNIC_UDP; 193 default: 194 BUG(); 195 return 0; 196 } 197 } 198 EXPORT_SYMBOL(rdma_node_get_transport); 199 200 enum rdma_link_layer rdma_port_get_link_layer(struct ib_device *device, u8 port_num) 201 { 202 if (device->get_link_layer) 203 return device->get_link_layer(device, port_num); 204 205 switch (rdma_node_get_transport(device->node_type)) { 206 case RDMA_TRANSPORT_IB: 207 return IB_LINK_LAYER_INFINIBAND; 208 case RDMA_TRANSPORT_IWARP: 209 case RDMA_TRANSPORT_USNIC: 210 case RDMA_TRANSPORT_USNIC_UDP: 211 return IB_LINK_LAYER_ETHERNET; 212 default: 213 return IB_LINK_LAYER_UNSPECIFIED; 214 } 215 } 216 EXPORT_SYMBOL(rdma_port_get_link_layer); 217 218 /* Protection domains */ 219 220 /** 221 * ib_alloc_pd - Allocates an unused protection domain. 222 * @device: The device on which to allocate the protection domain. 223 * 224 * A protection domain object provides an association between QPs, shared 225 * receive queues, address handles, memory regions, and memory windows. 226 * 227 * Every PD has a local_dma_lkey which can be used as the lkey value for local 228 * memory operations. 229 */ 230 struct ib_pd *__ib_alloc_pd(struct ib_device *device, unsigned int flags, 231 const char *caller) 232 { 233 struct ib_pd *pd; 234 int mr_access_flags = 0; 235 236 pd = device->alloc_pd(device, NULL, NULL); 237 if (IS_ERR(pd)) 238 return pd; 239 240 pd->device = device; 241 pd->uobject = NULL; 242 pd->__internal_mr = NULL; 243 atomic_set(&pd->usecnt, 0); 244 pd->flags = flags; 245 246 if (device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) 247 pd->local_dma_lkey = device->local_dma_lkey; 248 else 249 mr_access_flags |= IB_ACCESS_LOCAL_WRITE; 250 251 if (flags & IB_PD_UNSAFE_GLOBAL_RKEY) { 252 pr_warn("%s: enabling unsafe global rkey\n", caller); 253 mr_access_flags |= IB_ACCESS_REMOTE_READ | IB_ACCESS_REMOTE_WRITE; 254 } 255 256 if (mr_access_flags) { 257 struct ib_mr *mr; 258 259 mr = pd->device->get_dma_mr(pd, mr_access_flags); 260 if (IS_ERR(mr)) { 261 ib_dealloc_pd(pd); 262 return ERR_CAST(mr); 263 } 264 265 mr->device = pd->device; 266 mr->pd = pd; 267 mr->uobject = NULL; 268 mr->need_inval = false; 269 270 pd->__internal_mr = mr; 271 272 if (!(device->attrs.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) 273 pd->local_dma_lkey = pd->__internal_mr->lkey; 274 275 if (flags & IB_PD_UNSAFE_GLOBAL_RKEY) 276 pd->unsafe_global_rkey = pd->__internal_mr->rkey; 277 } 278 279 return pd; 280 } 281 EXPORT_SYMBOL(__ib_alloc_pd); 282 283 /** 284 * ib_dealloc_pd - Deallocates a protection domain. 285 * @pd: The protection domain to deallocate. 286 * 287 * It is an error to call this function while any resources in the pd still 288 * exist. The caller is responsible to synchronously destroy them and 289 * guarantee no new allocations will happen. 290 */ 291 void ib_dealloc_pd(struct ib_pd *pd) 292 { 293 int ret; 294 295 if (pd->__internal_mr) { 296 ret = pd->device->dereg_mr(pd->__internal_mr); 297 WARN_ON(ret); 298 pd->__internal_mr = NULL; 299 } 300 301 /* uverbs manipulates usecnt with proper locking, while the kabi 302 requires the caller to guarantee we can't race here. */ 303 WARN_ON(atomic_read(&pd->usecnt)); 304 305 /* Making delalloc_pd a void return is a WIP, no driver should return 306 an error here. */ 307 ret = pd->device->dealloc_pd(pd); 308 WARN_ONCE(ret, "Infiniband HW driver failed dealloc_pd"); 309 } 310 EXPORT_SYMBOL(ib_dealloc_pd); 311 312 /* Address handles */ 313 314 struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr) 315 { 316 struct ib_ah *ah; 317 318 ah = pd->device->create_ah(pd, ah_attr, NULL); 319 320 if (!IS_ERR(ah)) { 321 ah->device = pd->device; 322 ah->pd = pd; 323 ah->uobject = NULL; 324 atomic_inc(&pd->usecnt); 325 } 326 327 return ah; 328 } 329 EXPORT_SYMBOL(ib_create_ah); 330 331 int ib_get_rdma_header_version(const union rdma_network_hdr *hdr) 332 { 333 const struct iphdr *ip4h = (struct iphdr *)&hdr->roce4grh; 334 struct iphdr ip4h_checked; 335 const struct ipv6hdr *ip6h = (struct ipv6hdr *)&hdr->ibgrh; 336 337 /* If it's IPv6, the version must be 6, otherwise, the first 338 * 20 bytes (before the IPv4 header) are garbled. 339 */ 340 if (ip6h->version != 6) 341 return (ip4h->version == 4) ? 4 : 0; 342 /* version may be 6 or 4 because the first 20 bytes could be garbled */ 343 344 /* RoCE v2 requires no options, thus header length 345 * must be 5 words 346 */ 347 if (ip4h->ihl != 5) 348 return 6; 349 350 /* Verify checksum. 351 * We can't write on scattered buffers so we need to copy to 352 * temp buffer. 353 */ 354 memcpy(&ip4h_checked, ip4h, sizeof(ip4h_checked)); 355 ip4h_checked.check = 0; 356 ip4h_checked.check = ip_fast_csum((u8 *)&ip4h_checked, 5); 357 /* if IPv4 header checksum is OK, believe it */ 358 if (ip4h->check == ip4h_checked.check) 359 return 4; 360 return 6; 361 } 362 EXPORT_SYMBOL(ib_get_rdma_header_version); 363 364 static enum rdma_network_type ib_get_net_type_by_grh(struct ib_device *device, 365 u8 port_num, 366 const struct ib_grh *grh) 367 { 368 int grh_version; 369 370 if (rdma_protocol_ib(device, port_num)) 371 return RDMA_NETWORK_IB; 372 373 grh_version = ib_get_rdma_header_version((union rdma_network_hdr *)grh); 374 375 if (grh_version == 4) 376 return RDMA_NETWORK_IPV4; 377 378 if (grh->next_hdr == IPPROTO_UDP) 379 return RDMA_NETWORK_IPV6; 380 381 return RDMA_NETWORK_ROCE_V1; 382 } 383 384 struct find_gid_index_context { 385 u16 vlan_id; 386 enum ib_gid_type gid_type; 387 }; 388 389 static bool find_gid_index(const union ib_gid *gid, 390 const struct ib_gid_attr *gid_attr, 391 void *context) 392 { 393 struct find_gid_index_context *ctx = 394 (struct find_gid_index_context *)context; 395 396 if (ctx->gid_type != gid_attr->gid_type) 397 return false; 398 399 if ((!!(ctx->vlan_id != 0xffff) == !is_vlan_dev(gid_attr->ndev)) || 400 (is_vlan_dev(gid_attr->ndev) && 401 vlan_dev_vlan_id(gid_attr->ndev) != ctx->vlan_id)) 402 return false; 403 404 return true; 405 } 406 407 static int get_sgid_index_from_eth(struct ib_device *device, u8 port_num, 408 u16 vlan_id, const union ib_gid *sgid, 409 enum ib_gid_type gid_type, 410 u16 *gid_index) 411 { 412 struct find_gid_index_context context = {.vlan_id = vlan_id, 413 .gid_type = gid_type}; 414 415 return ib_find_gid_by_filter(device, sgid, port_num, find_gid_index, 416 &context, gid_index); 417 } 418 419 int ib_get_gids_from_rdma_hdr(const union rdma_network_hdr *hdr, 420 enum rdma_network_type net_type, 421 union ib_gid *sgid, union ib_gid *dgid) 422 { 423 struct sockaddr_in src_in; 424 struct sockaddr_in dst_in; 425 __be32 src_saddr, dst_saddr; 426 427 if (!sgid || !dgid) 428 return -EINVAL; 429 430 if (net_type == RDMA_NETWORK_IPV4) { 431 memcpy(&src_in.sin_addr.s_addr, 432 &hdr->roce4grh.saddr, 4); 433 memcpy(&dst_in.sin_addr.s_addr, 434 &hdr->roce4grh.daddr, 4); 435 src_saddr = src_in.sin_addr.s_addr; 436 dst_saddr = dst_in.sin_addr.s_addr; 437 ipv6_addr_set_v4mapped(src_saddr, 438 (struct in6_addr *)sgid); 439 ipv6_addr_set_v4mapped(dst_saddr, 440 (struct in6_addr *)dgid); 441 return 0; 442 } else if (net_type == RDMA_NETWORK_IPV6 || 443 net_type == RDMA_NETWORK_IB) { 444 *dgid = hdr->ibgrh.dgid; 445 *sgid = hdr->ibgrh.sgid; 446 return 0; 447 } else { 448 return -EINVAL; 449 } 450 } 451 EXPORT_SYMBOL(ib_get_gids_from_rdma_hdr); 452 453 int ib_init_ah_from_wc(struct ib_device *device, u8 port_num, 454 const struct ib_wc *wc, const struct ib_grh *grh, 455 struct ib_ah_attr *ah_attr) 456 { 457 u32 flow_class; 458 u16 gid_index; 459 int ret; 460 enum rdma_network_type net_type = RDMA_NETWORK_IB; 461 enum ib_gid_type gid_type = IB_GID_TYPE_IB; 462 int hoplimit = 0xff; 463 union ib_gid dgid; 464 union ib_gid sgid; 465 466 memset(ah_attr, 0, sizeof *ah_attr); 467 if (rdma_cap_eth_ah(device, port_num)) { 468 if (wc->wc_flags & IB_WC_WITH_NETWORK_HDR_TYPE) 469 net_type = wc->network_hdr_type; 470 else 471 net_type = ib_get_net_type_by_grh(device, port_num, grh); 472 gid_type = ib_network_to_gid_type(net_type); 473 } 474 ret = ib_get_gids_from_rdma_hdr((union rdma_network_hdr *)grh, net_type, 475 &sgid, &dgid); 476 if (ret) 477 return ret; 478 479 if (rdma_protocol_roce(device, port_num)) { 480 int if_index = 0; 481 u16 vlan_id = wc->wc_flags & IB_WC_WITH_VLAN ? 482 wc->vlan_id : 0xffff; 483 struct net_device *idev; 484 struct net_device *resolved_dev; 485 486 if (!(wc->wc_flags & IB_WC_GRH)) 487 return -EPROTOTYPE; 488 489 if (!device->get_netdev) 490 return -EOPNOTSUPP; 491 492 idev = device->get_netdev(device, port_num); 493 if (!idev) 494 return -ENODEV; 495 496 ret = rdma_addr_find_l2_eth_by_grh(&dgid, &sgid, 497 ah_attr->dmac, 498 wc->wc_flags & IB_WC_WITH_VLAN ? 499 NULL : &vlan_id, 500 &if_index, &hoplimit); 501 if (ret) { 502 dev_put(idev); 503 return ret; 504 } 505 506 resolved_dev = dev_get_by_index(&init_net, if_index); 507 if (resolved_dev->flags & IFF_LOOPBACK) { 508 dev_put(resolved_dev); 509 resolved_dev = idev; 510 dev_hold(resolved_dev); 511 } 512 rcu_read_lock(); 513 if (resolved_dev != idev && !rdma_is_upper_dev_rcu(idev, 514 resolved_dev)) 515 ret = -EHOSTUNREACH; 516 rcu_read_unlock(); 517 dev_put(idev); 518 dev_put(resolved_dev); 519 if (ret) 520 return ret; 521 522 ret = get_sgid_index_from_eth(device, port_num, vlan_id, 523 &dgid, gid_type, &gid_index); 524 if (ret) 525 return ret; 526 } 527 528 ah_attr->dlid = wc->slid; 529 ah_attr->sl = wc->sl; 530 ah_attr->src_path_bits = wc->dlid_path_bits; 531 ah_attr->port_num = port_num; 532 533 if (wc->wc_flags & IB_WC_GRH) { 534 ah_attr->ah_flags = IB_AH_GRH; 535 ah_attr->grh.dgid = sgid; 536 537 if (!rdma_cap_eth_ah(device, port_num)) { 538 if (dgid.global.interface_id != cpu_to_be64(IB_SA_WELL_KNOWN_GUID)) { 539 ret = ib_find_cached_gid_by_port(device, &dgid, 540 IB_GID_TYPE_IB, 541 port_num, NULL, 542 &gid_index); 543 if (ret) 544 return ret; 545 } else { 546 gid_index = 0; 547 } 548 } 549 550 ah_attr->grh.sgid_index = (u8) gid_index; 551 flow_class = be32_to_cpu(grh->version_tclass_flow); 552 ah_attr->grh.flow_label = flow_class & 0xFFFFF; 553 ah_attr->grh.hop_limit = hoplimit; 554 ah_attr->grh.traffic_class = (flow_class >> 20) & 0xFF; 555 } 556 return 0; 557 } 558 EXPORT_SYMBOL(ib_init_ah_from_wc); 559 560 struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, const struct ib_wc *wc, 561 const struct ib_grh *grh, u8 port_num) 562 { 563 struct ib_ah_attr ah_attr; 564 int ret; 565 566 ret = ib_init_ah_from_wc(pd->device, port_num, wc, grh, &ah_attr); 567 if (ret) 568 return ERR_PTR(ret); 569 570 return ib_create_ah(pd, &ah_attr); 571 } 572 EXPORT_SYMBOL(ib_create_ah_from_wc); 573 574 int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr) 575 { 576 return ah->device->modify_ah ? 577 ah->device->modify_ah(ah, ah_attr) : 578 -ENOSYS; 579 } 580 EXPORT_SYMBOL(ib_modify_ah); 581 582 int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr) 583 { 584 return ah->device->query_ah ? 585 ah->device->query_ah(ah, ah_attr) : 586 -ENOSYS; 587 } 588 EXPORT_SYMBOL(ib_query_ah); 589 590 int ib_destroy_ah(struct ib_ah *ah) 591 { 592 struct ib_pd *pd; 593 int ret; 594 595 pd = ah->pd; 596 ret = ah->device->destroy_ah(ah); 597 if (!ret) 598 atomic_dec(&pd->usecnt); 599 600 return ret; 601 } 602 EXPORT_SYMBOL(ib_destroy_ah); 603 604 /* Shared receive queues */ 605 606 struct ib_srq *ib_create_srq(struct ib_pd *pd, 607 struct ib_srq_init_attr *srq_init_attr) 608 { 609 struct ib_srq *srq; 610 611 if (!pd->device->create_srq) 612 return ERR_PTR(-ENOSYS); 613 614 srq = pd->device->create_srq(pd, srq_init_attr, NULL); 615 616 if (!IS_ERR(srq)) { 617 srq->device = pd->device; 618 srq->pd = pd; 619 srq->uobject = NULL; 620 srq->event_handler = srq_init_attr->event_handler; 621 srq->srq_context = srq_init_attr->srq_context; 622 srq->srq_type = srq_init_attr->srq_type; 623 if (srq->srq_type == IB_SRQT_XRC) { 624 srq->ext.xrc.xrcd = srq_init_attr->ext.xrc.xrcd; 625 srq->ext.xrc.cq = srq_init_attr->ext.xrc.cq; 626 atomic_inc(&srq->ext.xrc.xrcd->usecnt); 627 atomic_inc(&srq->ext.xrc.cq->usecnt); 628 } 629 atomic_inc(&pd->usecnt); 630 atomic_set(&srq->usecnt, 0); 631 } 632 633 return srq; 634 } 635 EXPORT_SYMBOL(ib_create_srq); 636 637 int ib_modify_srq(struct ib_srq *srq, 638 struct ib_srq_attr *srq_attr, 639 enum ib_srq_attr_mask srq_attr_mask) 640 { 641 return srq->device->modify_srq ? 642 srq->device->modify_srq(srq, srq_attr, srq_attr_mask, NULL) : 643 -ENOSYS; 644 } 645 EXPORT_SYMBOL(ib_modify_srq); 646 647 int ib_query_srq(struct ib_srq *srq, 648 struct ib_srq_attr *srq_attr) 649 { 650 return srq->device->query_srq ? 651 srq->device->query_srq(srq, srq_attr) : -ENOSYS; 652 } 653 EXPORT_SYMBOL(ib_query_srq); 654 655 int ib_destroy_srq(struct ib_srq *srq) 656 { 657 struct ib_pd *pd; 658 enum ib_srq_type srq_type; 659 struct ib_xrcd *uninitialized_var(xrcd); 660 struct ib_cq *uninitialized_var(cq); 661 int ret; 662 663 if (atomic_read(&srq->usecnt)) 664 return -EBUSY; 665 666 pd = srq->pd; 667 srq_type = srq->srq_type; 668 if (srq_type == IB_SRQT_XRC) { 669 xrcd = srq->ext.xrc.xrcd; 670 cq = srq->ext.xrc.cq; 671 } 672 673 ret = srq->device->destroy_srq(srq); 674 if (!ret) { 675 atomic_dec(&pd->usecnt); 676 if (srq_type == IB_SRQT_XRC) { 677 atomic_dec(&xrcd->usecnt); 678 atomic_dec(&cq->usecnt); 679 } 680 } 681 682 return ret; 683 } 684 EXPORT_SYMBOL(ib_destroy_srq); 685 686 /* Queue pairs */ 687 688 static void __ib_shared_qp_event_handler(struct ib_event *event, void *context) 689 { 690 struct ib_qp *qp = context; 691 unsigned long flags; 692 693 spin_lock_irqsave(&qp->device->event_handler_lock, flags); 694 list_for_each_entry(event->element.qp, &qp->open_list, open_list) 695 if (event->element.qp->event_handler) 696 event->element.qp->event_handler(event, event->element.qp->qp_context); 697 spin_unlock_irqrestore(&qp->device->event_handler_lock, flags); 698 } 699 700 static void __ib_insert_xrcd_qp(struct ib_xrcd *xrcd, struct ib_qp *qp) 701 { 702 mutex_lock(&xrcd->tgt_qp_mutex); 703 list_add(&qp->xrcd_list, &xrcd->tgt_qp_list); 704 mutex_unlock(&xrcd->tgt_qp_mutex); 705 } 706 707 static struct ib_qp *__ib_open_qp(struct ib_qp *real_qp, 708 void (*event_handler)(struct ib_event *, void *), 709 void *qp_context) 710 { 711 struct ib_qp *qp; 712 unsigned long flags; 713 714 qp = kzalloc(sizeof *qp, GFP_KERNEL); 715 if (!qp) 716 return ERR_PTR(-ENOMEM); 717 718 qp->real_qp = real_qp; 719 atomic_inc(&real_qp->usecnt); 720 qp->device = real_qp->device; 721 qp->event_handler = event_handler; 722 qp->qp_context = qp_context; 723 qp->qp_num = real_qp->qp_num; 724 qp->qp_type = real_qp->qp_type; 725 726 spin_lock_irqsave(&real_qp->device->event_handler_lock, flags); 727 list_add(&qp->open_list, &real_qp->open_list); 728 spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags); 729 730 return qp; 731 } 732 733 struct ib_qp *ib_open_qp(struct ib_xrcd *xrcd, 734 struct ib_qp_open_attr *qp_open_attr) 735 { 736 struct ib_qp *qp, *real_qp; 737 738 if (qp_open_attr->qp_type != IB_QPT_XRC_TGT) 739 return ERR_PTR(-EINVAL); 740 741 qp = ERR_PTR(-EINVAL); 742 mutex_lock(&xrcd->tgt_qp_mutex); 743 list_for_each_entry(real_qp, &xrcd->tgt_qp_list, xrcd_list) { 744 if (real_qp->qp_num == qp_open_attr->qp_num) { 745 qp = __ib_open_qp(real_qp, qp_open_attr->event_handler, 746 qp_open_attr->qp_context); 747 break; 748 } 749 } 750 mutex_unlock(&xrcd->tgt_qp_mutex); 751 return qp; 752 } 753 EXPORT_SYMBOL(ib_open_qp); 754 755 static struct ib_qp *ib_create_xrc_qp(struct ib_qp *qp, 756 struct ib_qp_init_attr *qp_init_attr) 757 { 758 struct ib_qp *real_qp = qp; 759 760 qp->event_handler = __ib_shared_qp_event_handler; 761 qp->qp_context = qp; 762 qp->pd = NULL; 763 qp->send_cq = qp->recv_cq = NULL; 764 qp->srq = NULL; 765 qp->xrcd = qp_init_attr->xrcd; 766 atomic_inc(&qp_init_attr->xrcd->usecnt); 767 INIT_LIST_HEAD(&qp->open_list); 768 769 qp = __ib_open_qp(real_qp, qp_init_attr->event_handler, 770 qp_init_attr->qp_context); 771 if (!IS_ERR(qp)) 772 __ib_insert_xrcd_qp(qp_init_attr->xrcd, real_qp); 773 else 774 real_qp->device->destroy_qp(real_qp); 775 return qp; 776 } 777 778 struct ib_qp *ib_create_qp(struct ib_pd *pd, 779 struct ib_qp_init_attr *qp_init_attr) 780 { 781 struct ib_device *device = pd ? pd->device : qp_init_attr->xrcd->device; 782 struct ib_qp *qp; 783 int ret; 784 785 if (qp_init_attr->rwq_ind_tbl && 786 (qp_init_attr->recv_cq || 787 qp_init_attr->srq || qp_init_attr->cap.max_recv_wr || 788 qp_init_attr->cap.max_recv_sge)) 789 return ERR_PTR(-EINVAL); 790 791 /* 792 * If the callers is using the RDMA API calculate the resources 793 * needed for the RDMA READ/WRITE operations. 794 * 795 * Note that these callers need to pass in a port number. 796 */ 797 if (qp_init_attr->cap.max_rdma_ctxs) 798 rdma_rw_init_qp(device, qp_init_attr); 799 800 qp = device->create_qp(pd, qp_init_attr, NULL); 801 if (IS_ERR(qp)) 802 return qp; 803 804 qp->device = device; 805 qp->real_qp = qp; 806 qp->uobject = NULL; 807 qp->qp_type = qp_init_attr->qp_type; 808 qp->rwq_ind_tbl = qp_init_attr->rwq_ind_tbl; 809 810 atomic_set(&qp->usecnt, 0); 811 qp->mrs_used = 0; 812 spin_lock_init(&qp->mr_lock); 813 INIT_LIST_HEAD(&qp->rdma_mrs); 814 INIT_LIST_HEAD(&qp->sig_mrs); 815 816 if (qp_init_attr->qp_type == IB_QPT_XRC_TGT) 817 return ib_create_xrc_qp(qp, qp_init_attr); 818 819 qp->event_handler = qp_init_attr->event_handler; 820 qp->qp_context = qp_init_attr->qp_context; 821 if (qp_init_attr->qp_type == IB_QPT_XRC_INI) { 822 qp->recv_cq = NULL; 823 qp->srq = NULL; 824 } else { 825 qp->recv_cq = qp_init_attr->recv_cq; 826 if (qp_init_attr->recv_cq) 827 atomic_inc(&qp_init_attr->recv_cq->usecnt); 828 qp->srq = qp_init_attr->srq; 829 if (qp->srq) 830 atomic_inc(&qp_init_attr->srq->usecnt); 831 } 832 833 qp->pd = pd; 834 qp->send_cq = qp_init_attr->send_cq; 835 qp->xrcd = NULL; 836 837 atomic_inc(&pd->usecnt); 838 if (qp_init_attr->send_cq) 839 atomic_inc(&qp_init_attr->send_cq->usecnt); 840 if (qp_init_attr->rwq_ind_tbl) 841 atomic_inc(&qp->rwq_ind_tbl->usecnt); 842 843 if (qp_init_attr->cap.max_rdma_ctxs) { 844 ret = rdma_rw_init_mrs(qp, qp_init_attr); 845 if (ret) { 846 pr_err("failed to init MR pool ret= %d\n", ret); 847 ib_destroy_qp(qp); 848 return ERR_PTR(ret); 849 } 850 } 851 852 /* 853 * Note: all hw drivers guarantee that max_send_sge is lower than 854 * the device RDMA WRITE SGE limit but not all hw drivers ensure that 855 * max_send_sge <= max_sge_rd. 856 */ 857 qp->max_write_sge = qp_init_attr->cap.max_send_sge; 858 qp->max_read_sge = min_t(u32, qp_init_attr->cap.max_send_sge, 859 device->attrs.max_sge_rd); 860 861 return qp; 862 } 863 EXPORT_SYMBOL(ib_create_qp); 864 865 static const struct { 866 int valid; 867 enum ib_qp_attr_mask req_param[IB_QPT_MAX]; 868 enum ib_qp_attr_mask opt_param[IB_QPT_MAX]; 869 } qp_state_table[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = { 870 [IB_QPS_RESET] = { 871 [IB_QPS_RESET] = { .valid = 1 }, 872 [IB_QPS_INIT] = { 873 .valid = 1, 874 .req_param = { 875 [IB_QPT_UD] = (IB_QP_PKEY_INDEX | 876 IB_QP_PORT | 877 IB_QP_QKEY), 878 [IB_QPT_RAW_PACKET] = IB_QP_PORT, 879 [IB_QPT_UC] = (IB_QP_PKEY_INDEX | 880 IB_QP_PORT | 881 IB_QP_ACCESS_FLAGS), 882 [IB_QPT_RC] = (IB_QP_PKEY_INDEX | 883 IB_QP_PORT | 884 IB_QP_ACCESS_FLAGS), 885 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX | 886 IB_QP_PORT | 887 IB_QP_ACCESS_FLAGS), 888 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX | 889 IB_QP_PORT | 890 IB_QP_ACCESS_FLAGS), 891 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX | 892 IB_QP_QKEY), 893 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX | 894 IB_QP_QKEY), 895 } 896 }, 897 }, 898 [IB_QPS_INIT] = { 899 [IB_QPS_RESET] = { .valid = 1 }, 900 [IB_QPS_ERR] = { .valid = 1 }, 901 [IB_QPS_INIT] = { 902 .valid = 1, 903 .opt_param = { 904 [IB_QPT_UD] = (IB_QP_PKEY_INDEX | 905 IB_QP_PORT | 906 IB_QP_QKEY), 907 [IB_QPT_UC] = (IB_QP_PKEY_INDEX | 908 IB_QP_PORT | 909 IB_QP_ACCESS_FLAGS), 910 [IB_QPT_RC] = (IB_QP_PKEY_INDEX | 911 IB_QP_PORT | 912 IB_QP_ACCESS_FLAGS), 913 [IB_QPT_XRC_INI] = (IB_QP_PKEY_INDEX | 914 IB_QP_PORT | 915 IB_QP_ACCESS_FLAGS), 916 [IB_QPT_XRC_TGT] = (IB_QP_PKEY_INDEX | 917 IB_QP_PORT | 918 IB_QP_ACCESS_FLAGS), 919 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX | 920 IB_QP_QKEY), 921 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX | 922 IB_QP_QKEY), 923 } 924 }, 925 [IB_QPS_RTR] = { 926 .valid = 1, 927 .req_param = { 928 [IB_QPT_UC] = (IB_QP_AV | 929 IB_QP_PATH_MTU | 930 IB_QP_DEST_QPN | 931 IB_QP_RQ_PSN), 932 [IB_QPT_RC] = (IB_QP_AV | 933 IB_QP_PATH_MTU | 934 IB_QP_DEST_QPN | 935 IB_QP_RQ_PSN | 936 IB_QP_MAX_DEST_RD_ATOMIC | 937 IB_QP_MIN_RNR_TIMER), 938 [IB_QPT_XRC_INI] = (IB_QP_AV | 939 IB_QP_PATH_MTU | 940 IB_QP_DEST_QPN | 941 IB_QP_RQ_PSN), 942 [IB_QPT_XRC_TGT] = (IB_QP_AV | 943 IB_QP_PATH_MTU | 944 IB_QP_DEST_QPN | 945 IB_QP_RQ_PSN | 946 IB_QP_MAX_DEST_RD_ATOMIC | 947 IB_QP_MIN_RNR_TIMER), 948 }, 949 .opt_param = { 950 [IB_QPT_UD] = (IB_QP_PKEY_INDEX | 951 IB_QP_QKEY), 952 [IB_QPT_UC] = (IB_QP_ALT_PATH | 953 IB_QP_ACCESS_FLAGS | 954 IB_QP_PKEY_INDEX), 955 [IB_QPT_RC] = (IB_QP_ALT_PATH | 956 IB_QP_ACCESS_FLAGS | 957 IB_QP_PKEY_INDEX), 958 [IB_QPT_XRC_INI] = (IB_QP_ALT_PATH | 959 IB_QP_ACCESS_FLAGS | 960 IB_QP_PKEY_INDEX), 961 [IB_QPT_XRC_TGT] = (IB_QP_ALT_PATH | 962 IB_QP_ACCESS_FLAGS | 963 IB_QP_PKEY_INDEX), 964 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX | 965 IB_QP_QKEY), 966 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX | 967 IB_QP_QKEY), 968 }, 969 }, 970 }, 971 [IB_QPS_RTR] = { 972 [IB_QPS_RESET] = { .valid = 1 }, 973 [IB_QPS_ERR] = { .valid = 1 }, 974 [IB_QPS_RTS] = { 975 .valid = 1, 976 .req_param = { 977 [IB_QPT_UD] = IB_QP_SQ_PSN, 978 [IB_QPT_UC] = IB_QP_SQ_PSN, 979 [IB_QPT_RC] = (IB_QP_TIMEOUT | 980 IB_QP_RETRY_CNT | 981 IB_QP_RNR_RETRY | 982 IB_QP_SQ_PSN | 983 IB_QP_MAX_QP_RD_ATOMIC), 984 [IB_QPT_XRC_INI] = (IB_QP_TIMEOUT | 985 IB_QP_RETRY_CNT | 986 IB_QP_RNR_RETRY | 987 IB_QP_SQ_PSN | 988 IB_QP_MAX_QP_RD_ATOMIC), 989 [IB_QPT_XRC_TGT] = (IB_QP_TIMEOUT | 990 IB_QP_SQ_PSN), 991 [IB_QPT_SMI] = IB_QP_SQ_PSN, 992 [IB_QPT_GSI] = IB_QP_SQ_PSN, 993 }, 994 .opt_param = { 995 [IB_QPT_UD] = (IB_QP_CUR_STATE | 996 IB_QP_QKEY), 997 [IB_QPT_UC] = (IB_QP_CUR_STATE | 998 IB_QP_ALT_PATH | 999 IB_QP_ACCESS_FLAGS | 1000 IB_QP_PATH_MIG_STATE), 1001 [IB_QPT_RC] = (IB_QP_CUR_STATE | 1002 IB_QP_ALT_PATH | 1003 IB_QP_ACCESS_FLAGS | 1004 IB_QP_MIN_RNR_TIMER | 1005 IB_QP_PATH_MIG_STATE), 1006 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE | 1007 IB_QP_ALT_PATH | 1008 IB_QP_ACCESS_FLAGS | 1009 IB_QP_PATH_MIG_STATE), 1010 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE | 1011 IB_QP_ALT_PATH | 1012 IB_QP_ACCESS_FLAGS | 1013 IB_QP_MIN_RNR_TIMER | 1014 IB_QP_PATH_MIG_STATE), 1015 [IB_QPT_SMI] = (IB_QP_CUR_STATE | 1016 IB_QP_QKEY), 1017 [IB_QPT_GSI] = (IB_QP_CUR_STATE | 1018 IB_QP_QKEY), 1019 [IB_QPT_RAW_PACKET] = IB_QP_RATE_LIMIT, 1020 } 1021 } 1022 }, 1023 [IB_QPS_RTS] = { 1024 [IB_QPS_RESET] = { .valid = 1 }, 1025 [IB_QPS_ERR] = { .valid = 1 }, 1026 [IB_QPS_RTS] = { 1027 .valid = 1, 1028 .opt_param = { 1029 [IB_QPT_UD] = (IB_QP_CUR_STATE | 1030 IB_QP_QKEY), 1031 [IB_QPT_UC] = (IB_QP_CUR_STATE | 1032 IB_QP_ACCESS_FLAGS | 1033 IB_QP_ALT_PATH | 1034 IB_QP_PATH_MIG_STATE), 1035 [IB_QPT_RC] = (IB_QP_CUR_STATE | 1036 IB_QP_ACCESS_FLAGS | 1037 IB_QP_ALT_PATH | 1038 IB_QP_PATH_MIG_STATE | 1039 IB_QP_MIN_RNR_TIMER), 1040 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE | 1041 IB_QP_ACCESS_FLAGS | 1042 IB_QP_ALT_PATH | 1043 IB_QP_PATH_MIG_STATE), 1044 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE | 1045 IB_QP_ACCESS_FLAGS | 1046 IB_QP_ALT_PATH | 1047 IB_QP_PATH_MIG_STATE | 1048 IB_QP_MIN_RNR_TIMER), 1049 [IB_QPT_SMI] = (IB_QP_CUR_STATE | 1050 IB_QP_QKEY), 1051 [IB_QPT_GSI] = (IB_QP_CUR_STATE | 1052 IB_QP_QKEY), 1053 [IB_QPT_RAW_PACKET] = IB_QP_RATE_LIMIT, 1054 } 1055 }, 1056 [IB_QPS_SQD] = { 1057 .valid = 1, 1058 .opt_param = { 1059 [IB_QPT_UD] = IB_QP_EN_SQD_ASYNC_NOTIFY, 1060 [IB_QPT_UC] = IB_QP_EN_SQD_ASYNC_NOTIFY, 1061 [IB_QPT_RC] = IB_QP_EN_SQD_ASYNC_NOTIFY, 1062 [IB_QPT_XRC_INI] = IB_QP_EN_SQD_ASYNC_NOTIFY, 1063 [IB_QPT_XRC_TGT] = IB_QP_EN_SQD_ASYNC_NOTIFY, /* ??? */ 1064 [IB_QPT_SMI] = IB_QP_EN_SQD_ASYNC_NOTIFY, 1065 [IB_QPT_GSI] = IB_QP_EN_SQD_ASYNC_NOTIFY 1066 } 1067 }, 1068 }, 1069 [IB_QPS_SQD] = { 1070 [IB_QPS_RESET] = { .valid = 1 }, 1071 [IB_QPS_ERR] = { .valid = 1 }, 1072 [IB_QPS_RTS] = { 1073 .valid = 1, 1074 .opt_param = { 1075 [IB_QPT_UD] = (IB_QP_CUR_STATE | 1076 IB_QP_QKEY), 1077 [IB_QPT_UC] = (IB_QP_CUR_STATE | 1078 IB_QP_ALT_PATH | 1079 IB_QP_ACCESS_FLAGS | 1080 IB_QP_PATH_MIG_STATE), 1081 [IB_QPT_RC] = (IB_QP_CUR_STATE | 1082 IB_QP_ALT_PATH | 1083 IB_QP_ACCESS_FLAGS | 1084 IB_QP_MIN_RNR_TIMER | 1085 IB_QP_PATH_MIG_STATE), 1086 [IB_QPT_XRC_INI] = (IB_QP_CUR_STATE | 1087 IB_QP_ALT_PATH | 1088 IB_QP_ACCESS_FLAGS | 1089 IB_QP_PATH_MIG_STATE), 1090 [IB_QPT_XRC_TGT] = (IB_QP_CUR_STATE | 1091 IB_QP_ALT_PATH | 1092 IB_QP_ACCESS_FLAGS | 1093 IB_QP_MIN_RNR_TIMER | 1094 IB_QP_PATH_MIG_STATE), 1095 [IB_QPT_SMI] = (IB_QP_CUR_STATE | 1096 IB_QP_QKEY), 1097 [IB_QPT_GSI] = (IB_QP_CUR_STATE | 1098 IB_QP_QKEY), 1099 } 1100 }, 1101 [IB_QPS_SQD] = { 1102 .valid = 1, 1103 .opt_param = { 1104 [IB_QPT_UD] = (IB_QP_PKEY_INDEX | 1105 IB_QP_QKEY), 1106 [IB_QPT_UC] = (IB_QP_AV | 1107 IB_QP_ALT_PATH | 1108 IB_QP_ACCESS_FLAGS | 1109 IB_QP_PKEY_INDEX | 1110 IB_QP_PATH_MIG_STATE), 1111 [IB_QPT_RC] = (IB_QP_PORT | 1112 IB_QP_AV | 1113 IB_QP_TIMEOUT | 1114 IB_QP_RETRY_CNT | 1115 IB_QP_RNR_RETRY | 1116 IB_QP_MAX_QP_RD_ATOMIC | 1117 IB_QP_MAX_DEST_RD_ATOMIC | 1118 IB_QP_ALT_PATH | 1119 IB_QP_ACCESS_FLAGS | 1120 IB_QP_PKEY_INDEX | 1121 IB_QP_MIN_RNR_TIMER | 1122 IB_QP_PATH_MIG_STATE), 1123 [IB_QPT_XRC_INI] = (IB_QP_PORT | 1124 IB_QP_AV | 1125 IB_QP_TIMEOUT | 1126 IB_QP_RETRY_CNT | 1127 IB_QP_RNR_RETRY | 1128 IB_QP_MAX_QP_RD_ATOMIC | 1129 IB_QP_ALT_PATH | 1130 IB_QP_ACCESS_FLAGS | 1131 IB_QP_PKEY_INDEX | 1132 IB_QP_PATH_MIG_STATE), 1133 [IB_QPT_XRC_TGT] = (IB_QP_PORT | 1134 IB_QP_AV | 1135 IB_QP_TIMEOUT | 1136 IB_QP_MAX_DEST_RD_ATOMIC | 1137 IB_QP_ALT_PATH | 1138 IB_QP_ACCESS_FLAGS | 1139 IB_QP_PKEY_INDEX | 1140 IB_QP_MIN_RNR_TIMER | 1141 IB_QP_PATH_MIG_STATE), 1142 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX | 1143 IB_QP_QKEY), 1144 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX | 1145 IB_QP_QKEY), 1146 } 1147 } 1148 }, 1149 [IB_QPS_SQE] = { 1150 [IB_QPS_RESET] = { .valid = 1 }, 1151 [IB_QPS_ERR] = { .valid = 1 }, 1152 [IB_QPS_RTS] = { 1153 .valid = 1, 1154 .opt_param = { 1155 [IB_QPT_UD] = (IB_QP_CUR_STATE | 1156 IB_QP_QKEY), 1157 [IB_QPT_UC] = (IB_QP_CUR_STATE | 1158 IB_QP_ACCESS_FLAGS), 1159 [IB_QPT_SMI] = (IB_QP_CUR_STATE | 1160 IB_QP_QKEY), 1161 [IB_QPT_GSI] = (IB_QP_CUR_STATE | 1162 IB_QP_QKEY), 1163 } 1164 } 1165 }, 1166 [IB_QPS_ERR] = { 1167 [IB_QPS_RESET] = { .valid = 1 }, 1168 [IB_QPS_ERR] = { .valid = 1 } 1169 } 1170 }; 1171 1172 int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state, 1173 enum ib_qp_type type, enum ib_qp_attr_mask mask, 1174 enum rdma_link_layer ll) 1175 { 1176 enum ib_qp_attr_mask req_param, opt_param; 1177 1178 if (cur_state < 0 || cur_state > IB_QPS_ERR || 1179 next_state < 0 || next_state > IB_QPS_ERR) 1180 return 0; 1181 1182 if (mask & IB_QP_CUR_STATE && 1183 cur_state != IB_QPS_RTR && cur_state != IB_QPS_RTS && 1184 cur_state != IB_QPS_SQD && cur_state != IB_QPS_SQE) 1185 return 0; 1186 1187 if (!qp_state_table[cur_state][next_state].valid) 1188 return 0; 1189 1190 req_param = qp_state_table[cur_state][next_state].req_param[type]; 1191 opt_param = qp_state_table[cur_state][next_state].opt_param[type]; 1192 1193 if ((mask & req_param) != req_param) 1194 return 0; 1195 1196 if (mask & ~(req_param | opt_param | IB_QP_STATE)) 1197 return 0; 1198 1199 return 1; 1200 } 1201 EXPORT_SYMBOL(ib_modify_qp_is_ok); 1202 1203 int ib_resolve_eth_dmac(struct ib_device *device, 1204 struct ib_ah_attr *ah_attr) 1205 { 1206 int ret = 0; 1207 1208 if (ah_attr->port_num < rdma_start_port(device) || 1209 ah_attr->port_num > rdma_end_port(device)) 1210 return -EINVAL; 1211 1212 if (!rdma_cap_eth_ah(device, ah_attr->port_num)) 1213 return 0; 1214 1215 if (rdma_link_local_addr((struct in6_addr *)ah_attr->grh.dgid.raw)) { 1216 rdma_get_ll_mac((struct in6_addr *)ah_attr->grh.dgid.raw, 1217 ah_attr->dmac); 1218 } else { 1219 union ib_gid sgid; 1220 struct ib_gid_attr sgid_attr; 1221 int ifindex; 1222 int hop_limit; 1223 1224 ret = ib_query_gid(device, 1225 ah_attr->port_num, 1226 ah_attr->grh.sgid_index, 1227 &sgid, &sgid_attr); 1228 1229 if (ret || !sgid_attr.ndev) { 1230 if (!ret) 1231 ret = -ENXIO; 1232 goto out; 1233 } 1234 1235 ifindex = sgid_attr.ndev->ifindex; 1236 1237 ret = rdma_addr_find_l2_eth_by_grh(&sgid, 1238 &ah_attr->grh.dgid, 1239 ah_attr->dmac, 1240 NULL, &ifindex, &hop_limit); 1241 1242 dev_put(sgid_attr.ndev); 1243 1244 ah_attr->grh.hop_limit = hop_limit; 1245 } 1246 out: 1247 return ret; 1248 } 1249 EXPORT_SYMBOL(ib_resolve_eth_dmac); 1250 1251 int ib_modify_qp(struct ib_qp *qp, 1252 struct ib_qp_attr *qp_attr, 1253 int qp_attr_mask) 1254 { 1255 1256 if (qp_attr_mask & IB_QP_AV) { 1257 int ret; 1258 1259 ret = ib_resolve_eth_dmac(qp->device, &qp_attr->ah_attr); 1260 if (ret) 1261 return ret; 1262 } 1263 1264 return qp->device->modify_qp(qp->real_qp, qp_attr, qp_attr_mask, NULL); 1265 } 1266 EXPORT_SYMBOL(ib_modify_qp); 1267 1268 int ib_query_qp(struct ib_qp *qp, 1269 struct ib_qp_attr *qp_attr, 1270 int qp_attr_mask, 1271 struct ib_qp_init_attr *qp_init_attr) 1272 { 1273 return qp->device->query_qp ? 1274 qp->device->query_qp(qp->real_qp, qp_attr, qp_attr_mask, qp_init_attr) : 1275 -ENOSYS; 1276 } 1277 EXPORT_SYMBOL(ib_query_qp); 1278 1279 int ib_close_qp(struct ib_qp *qp) 1280 { 1281 struct ib_qp *real_qp; 1282 unsigned long flags; 1283 1284 real_qp = qp->real_qp; 1285 if (real_qp == qp) 1286 return -EINVAL; 1287 1288 spin_lock_irqsave(&real_qp->device->event_handler_lock, flags); 1289 list_del(&qp->open_list); 1290 spin_unlock_irqrestore(&real_qp->device->event_handler_lock, flags); 1291 1292 atomic_dec(&real_qp->usecnt); 1293 kfree(qp); 1294 1295 return 0; 1296 } 1297 EXPORT_SYMBOL(ib_close_qp); 1298 1299 static int __ib_destroy_shared_qp(struct ib_qp *qp) 1300 { 1301 struct ib_xrcd *xrcd; 1302 struct ib_qp *real_qp; 1303 int ret; 1304 1305 real_qp = qp->real_qp; 1306 xrcd = real_qp->xrcd; 1307 1308 mutex_lock(&xrcd->tgt_qp_mutex); 1309 ib_close_qp(qp); 1310 if (atomic_read(&real_qp->usecnt) == 0) 1311 list_del(&real_qp->xrcd_list); 1312 else 1313 real_qp = NULL; 1314 mutex_unlock(&xrcd->tgt_qp_mutex); 1315 1316 if (real_qp) { 1317 ret = ib_destroy_qp(real_qp); 1318 if (!ret) 1319 atomic_dec(&xrcd->usecnt); 1320 else 1321 __ib_insert_xrcd_qp(xrcd, real_qp); 1322 } 1323 1324 return 0; 1325 } 1326 1327 int ib_destroy_qp(struct ib_qp *qp) 1328 { 1329 struct ib_pd *pd; 1330 struct ib_cq *scq, *rcq; 1331 struct ib_srq *srq; 1332 struct ib_rwq_ind_table *ind_tbl; 1333 int ret; 1334 1335 WARN_ON_ONCE(qp->mrs_used > 0); 1336 1337 if (atomic_read(&qp->usecnt)) 1338 return -EBUSY; 1339 1340 if (qp->real_qp != qp) 1341 return __ib_destroy_shared_qp(qp); 1342 1343 pd = qp->pd; 1344 scq = qp->send_cq; 1345 rcq = qp->recv_cq; 1346 srq = qp->srq; 1347 ind_tbl = qp->rwq_ind_tbl; 1348 1349 if (!qp->uobject) 1350 rdma_rw_cleanup_mrs(qp); 1351 1352 ret = qp->device->destroy_qp(qp); 1353 if (!ret) { 1354 if (pd) 1355 atomic_dec(&pd->usecnt); 1356 if (scq) 1357 atomic_dec(&scq->usecnt); 1358 if (rcq) 1359 atomic_dec(&rcq->usecnt); 1360 if (srq) 1361 atomic_dec(&srq->usecnt); 1362 if (ind_tbl) 1363 atomic_dec(&ind_tbl->usecnt); 1364 } 1365 1366 return ret; 1367 } 1368 EXPORT_SYMBOL(ib_destroy_qp); 1369 1370 /* Completion queues */ 1371 1372 struct ib_cq *ib_create_cq(struct ib_device *device, 1373 ib_comp_handler comp_handler, 1374 void (*event_handler)(struct ib_event *, void *), 1375 void *cq_context, 1376 const struct ib_cq_init_attr *cq_attr) 1377 { 1378 struct ib_cq *cq; 1379 1380 cq = device->create_cq(device, cq_attr, NULL, NULL); 1381 1382 if (!IS_ERR(cq)) { 1383 cq->device = device; 1384 cq->uobject = NULL; 1385 cq->comp_handler = comp_handler; 1386 cq->event_handler = event_handler; 1387 cq->cq_context = cq_context; 1388 atomic_set(&cq->usecnt, 0); 1389 } 1390 1391 return cq; 1392 } 1393 EXPORT_SYMBOL(ib_create_cq); 1394 1395 int ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period) 1396 { 1397 return cq->device->modify_cq ? 1398 cq->device->modify_cq(cq, cq_count, cq_period) : -ENOSYS; 1399 } 1400 EXPORT_SYMBOL(ib_modify_cq); 1401 1402 int ib_destroy_cq(struct ib_cq *cq) 1403 { 1404 if (atomic_read(&cq->usecnt)) 1405 return -EBUSY; 1406 1407 return cq->device->destroy_cq(cq); 1408 } 1409 EXPORT_SYMBOL(ib_destroy_cq); 1410 1411 int ib_resize_cq(struct ib_cq *cq, int cqe) 1412 { 1413 return cq->device->resize_cq ? 1414 cq->device->resize_cq(cq, cqe, NULL) : -ENOSYS; 1415 } 1416 EXPORT_SYMBOL(ib_resize_cq); 1417 1418 /* Memory regions */ 1419 1420 int ib_dereg_mr(struct ib_mr *mr) 1421 { 1422 struct ib_pd *pd = mr->pd; 1423 int ret; 1424 1425 ret = mr->device->dereg_mr(mr); 1426 if (!ret) 1427 atomic_dec(&pd->usecnt); 1428 1429 return ret; 1430 } 1431 EXPORT_SYMBOL(ib_dereg_mr); 1432 1433 /** 1434 * ib_alloc_mr() - Allocates a memory region 1435 * @pd: protection domain associated with the region 1436 * @mr_type: memory region type 1437 * @max_num_sg: maximum sg entries available for registration. 1438 * 1439 * Notes: 1440 * Memory registeration page/sg lists must not exceed max_num_sg. 1441 * For mr_type IB_MR_TYPE_MEM_REG, the total length cannot exceed 1442 * max_num_sg * used_page_size. 1443 * 1444 */ 1445 struct ib_mr *ib_alloc_mr(struct ib_pd *pd, 1446 enum ib_mr_type mr_type, 1447 u32 max_num_sg) 1448 { 1449 struct ib_mr *mr; 1450 1451 if (!pd->device->alloc_mr) 1452 return ERR_PTR(-ENOSYS); 1453 1454 mr = pd->device->alloc_mr(pd, mr_type, max_num_sg); 1455 if (!IS_ERR(mr)) { 1456 mr->device = pd->device; 1457 mr->pd = pd; 1458 mr->uobject = NULL; 1459 atomic_inc(&pd->usecnt); 1460 mr->need_inval = false; 1461 } 1462 1463 return mr; 1464 } 1465 EXPORT_SYMBOL(ib_alloc_mr); 1466 1467 /* "Fast" memory regions */ 1468 1469 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd, 1470 int mr_access_flags, 1471 struct ib_fmr_attr *fmr_attr) 1472 { 1473 struct ib_fmr *fmr; 1474 1475 if (!pd->device->alloc_fmr) 1476 return ERR_PTR(-ENOSYS); 1477 1478 fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr); 1479 if (!IS_ERR(fmr)) { 1480 fmr->device = pd->device; 1481 fmr->pd = pd; 1482 atomic_inc(&pd->usecnt); 1483 } 1484 1485 return fmr; 1486 } 1487 EXPORT_SYMBOL(ib_alloc_fmr); 1488 1489 int ib_unmap_fmr(struct list_head *fmr_list) 1490 { 1491 struct ib_fmr *fmr; 1492 1493 if (list_empty(fmr_list)) 1494 return 0; 1495 1496 fmr = list_entry(fmr_list->next, struct ib_fmr, list); 1497 return fmr->device->unmap_fmr(fmr_list); 1498 } 1499 EXPORT_SYMBOL(ib_unmap_fmr); 1500 1501 int ib_dealloc_fmr(struct ib_fmr *fmr) 1502 { 1503 struct ib_pd *pd; 1504 int ret; 1505 1506 pd = fmr->pd; 1507 ret = fmr->device->dealloc_fmr(fmr); 1508 if (!ret) 1509 atomic_dec(&pd->usecnt); 1510 1511 return ret; 1512 } 1513 EXPORT_SYMBOL(ib_dealloc_fmr); 1514 1515 /* Multicast groups */ 1516 1517 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid) 1518 { 1519 int ret; 1520 1521 if (!qp->device->attach_mcast) 1522 return -ENOSYS; 1523 if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD) 1524 return -EINVAL; 1525 1526 ret = qp->device->attach_mcast(qp, gid, lid); 1527 if (!ret) 1528 atomic_inc(&qp->usecnt); 1529 return ret; 1530 } 1531 EXPORT_SYMBOL(ib_attach_mcast); 1532 1533 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid) 1534 { 1535 int ret; 1536 1537 if (!qp->device->detach_mcast) 1538 return -ENOSYS; 1539 if (gid->raw[0] != 0xff || qp->qp_type != IB_QPT_UD) 1540 return -EINVAL; 1541 1542 ret = qp->device->detach_mcast(qp, gid, lid); 1543 if (!ret) 1544 atomic_dec(&qp->usecnt); 1545 return ret; 1546 } 1547 EXPORT_SYMBOL(ib_detach_mcast); 1548 1549 struct ib_xrcd *ib_alloc_xrcd(struct ib_device *device) 1550 { 1551 struct ib_xrcd *xrcd; 1552 1553 if (!device->alloc_xrcd) 1554 return ERR_PTR(-ENOSYS); 1555 1556 xrcd = device->alloc_xrcd(device, NULL, NULL); 1557 if (!IS_ERR(xrcd)) { 1558 xrcd->device = device; 1559 xrcd->inode = NULL; 1560 atomic_set(&xrcd->usecnt, 0); 1561 mutex_init(&xrcd->tgt_qp_mutex); 1562 INIT_LIST_HEAD(&xrcd->tgt_qp_list); 1563 } 1564 1565 return xrcd; 1566 } 1567 EXPORT_SYMBOL(ib_alloc_xrcd); 1568 1569 int ib_dealloc_xrcd(struct ib_xrcd *xrcd) 1570 { 1571 struct ib_qp *qp; 1572 int ret; 1573 1574 if (atomic_read(&xrcd->usecnt)) 1575 return -EBUSY; 1576 1577 while (!list_empty(&xrcd->tgt_qp_list)) { 1578 qp = list_entry(xrcd->tgt_qp_list.next, struct ib_qp, xrcd_list); 1579 ret = ib_destroy_qp(qp); 1580 if (ret) 1581 return ret; 1582 } 1583 1584 return xrcd->device->dealloc_xrcd(xrcd); 1585 } 1586 EXPORT_SYMBOL(ib_dealloc_xrcd); 1587 1588 /** 1589 * ib_create_wq - Creates a WQ associated with the specified protection 1590 * domain. 1591 * @pd: The protection domain associated with the WQ. 1592 * @wq_init_attr: A list of initial attributes required to create the 1593 * WQ. If WQ creation succeeds, then the attributes are updated to 1594 * the actual capabilities of the created WQ. 1595 * 1596 * wq_init_attr->max_wr and wq_init_attr->max_sge determine 1597 * the requested size of the WQ, and set to the actual values allocated 1598 * on return. 1599 * If ib_create_wq() succeeds, then max_wr and max_sge will always be 1600 * at least as large as the requested values. 1601 */ 1602 struct ib_wq *ib_create_wq(struct ib_pd *pd, 1603 struct ib_wq_init_attr *wq_attr) 1604 { 1605 struct ib_wq *wq; 1606 1607 if (!pd->device->create_wq) 1608 return ERR_PTR(-ENOSYS); 1609 1610 wq = pd->device->create_wq(pd, wq_attr, NULL); 1611 if (!IS_ERR(wq)) { 1612 wq->event_handler = wq_attr->event_handler; 1613 wq->wq_context = wq_attr->wq_context; 1614 wq->wq_type = wq_attr->wq_type; 1615 wq->cq = wq_attr->cq; 1616 wq->device = pd->device; 1617 wq->pd = pd; 1618 wq->uobject = NULL; 1619 atomic_inc(&pd->usecnt); 1620 atomic_inc(&wq_attr->cq->usecnt); 1621 atomic_set(&wq->usecnt, 0); 1622 } 1623 return wq; 1624 } 1625 EXPORT_SYMBOL(ib_create_wq); 1626 1627 /** 1628 * ib_destroy_wq - Destroys the specified WQ. 1629 * @wq: The WQ to destroy. 1630 */ 1631 int ib_destroy_wq(struct ib_wq *wq) 1632 { 1633 int err; 1634 struct ib_cq *cq = wq->cq; 1635 struct ib_pd *pd = wq->pd; 1636 1637 if (atomic_read(&wq->usecnt)) 1638 return -EBUSY; 1639 1640 err = wq->device->destroy_wq(wq); 1641 if (!err) { 1642 atomic_dec(&pd->usecnt); 1643 atomic_dec(&cq->usecnt); 1644 } 1645 return err; 1646 } 1647 EXPORT_SYMBOL(ib_destroy_wq); 1648 1649 /** 1650 * ib_modify_wq - Modifies the specified WQ. 1651 * @wq: The WQ to modify. 1652 * @wq_attr: On input, specifies the WQ attributes to modify. 1653 * @wq_attr_mask: A bit-mask used to specify which attributes of the WQ 1654 * are being modified. 1655 * On output, the current values of selected WQ attributes are returned. 1656 */ 1657 int ib_modify_wq(struct ib_wq *wq, struct ib_wq_attr *wq_attr, 1658 u32 wq_attr_mask) 1659 { 1660 int err; 1661 1662 if (!wq->device->modify_wq) 1663 return -ENOSYS; 1664 1665 err = wq->device->modify_wq(wq, wq_attr, wq_attr_mask, NULL); 1666 return err; 1667 } 1668 EXPORT_SYMBOL(ib_modify_wq); 1669 1670 /* 1671 * ib_create_rwq_ind_table - Creates a RQ Indirection Table. 1672 * @device: The device on which to create the rwq indirection table. 1673 * @ib_rwq_ind_table_init_attr: A list of initial attributes required to 1674 * create the Indirection Table. 1675 * 1676 * Note: The life time of ib_rwq_ind_table_init_attr->ind_tbl is not less 1677 * than the created ib_rwq_ind_table object and the caller is responsible 1678 * for its memory allocation/free. 1679 */ 1680 struct ib_rwq_ind_table *ib_create_rwq_ind_table(struct ib_device *device, 1681 struct ib_rwq_ind_table_init_attr *init_attr) 1682 { 1683 struct ib_rwq_ind_table *rwq_ind_table; 1684 int i; 1685 u32 table_size; 1686 1687 if (!device->create_rwq_ind_table) 1688 return ERR_PTR(-ENOSYS); 1689 1690 table_size = (1 << init_attr->log_ind_tbl_size); 1691 rwq_ind_table = device->create_rwq_ind_table(device, 1692 init_attr, NULL); 1693 if (IS_ERR(rwq_ind_table)) 1694 return rwq_ind_table; 1695 1696 rwq_ind_table->ind_tbl = init_attr->ind_tbl; 1697 rwq_ind_table->log_ind_tbl_size = init_attr->log_ind_tbl_size; 1698 rwq_ind_table->device = device; 1699 rwq_ind_table->uobject = NULL; 1700 atomic_set(&rwq_ind_table->usecnt, 0); 1701 1702 for (i = 0; i < table_size; i++) 1703 atomic_inc(&rwq_ind_table->ind_tbl[i]->usecnt); 1704 1705 return rwq_ind_table; 1706 } 1707 EXPORT_SYMBOL(ib_create_rwq_ind_table); 1708 1709 /* 1710 * ib_destroy_rwq_ind_table - Destroys the specified Indirection Table. 1711 * @wq_ind_table: The Indirection Table to destroy. 1712 */ 1713 int ib_destroy_rwq_ind_table(struct ib_rwq_ind_table *rwq_ind_table) 1714 { 1715 int err, i; 1716 u32 table_size = (1 << rwq_ind_table->log_ind_tbl_size); 1717 struct ib_wq **ind_tbl = rwq_ind_table->ind_tbl; 1718 1719 if (atomic_read(&rwq_ind_table->usecnt)) 1720 return -EBUSY; 1721 1722 err = rwq_ind_table->device->destroy_rwq_ind_table(rwq_ind_table); 1723 if (!err) { 1724 for (i = 0; i < table_size; i++) 1725 atomic_dec(&ind_tbl[i]->usecnt); 1726 } 1727 1728 return err; 1729 } 1730 EXPORT_SYMBOL(ib_destroy_rwq_ind_table); 1731 1732 struct ib_flow *ib_create_flow(struct ib_qp *qp, 1733 struct ib_flow_attr *flow_attr, 1734 int domain) 1735 { 1736 struct ib_flow *flow_id; 1737 if (!qp->device->create_flow) 1738 return ERR_PTR(-ENOSYS); 1739 1740 flow_id = qp->device->create_flow(qp, flow_attr, domain); 1741 if (!IS_ERR(flow_id)) { 1742 atomic_inc(&qp->usecnt); 1743 flow_id->qp = qp; 1744 } 1745 return flow_id; 1746 } 1747 EXPORT_SYMBOL(ib_create_flow); 1748 1749 int ib_destroy_flow(struct ib_flow *flow_id) 1750 { 1751 int err; 1752 struct ib_qp *qp = flow_id->qp; 1753 1754 err = qp->device->destroy_flow(flow_id); 1755 if (!err) 1756 atomic_dec(&qp->usecnt); 1757 return err; 1758 } 1759 EXPORT_SYMBOL(ib_destroy_flow); 1760 1761 int ib_check_mr_status(struct ib_mr *mr, u32 check_mask, 1762 struct ib_mr_status *mr_status) 1763 { 1764 return mr->device->check_mr_status ? 1765 mr->device->check_mr_status(mr, check_mask, mr_status) : -ENOSYS; 1766 } 1767 EXPORT_SYMBOL(ib_check_mr_status); 1768 1769 int ib_set_vf_link_state(struct ib_device *device, int vf, u8 port, 1770 int state) 1771 { 1772 if (!device->set_vf_link_state) 1773 return -ENOSYS; 1774 1775 return device->set_vf_link_state(device, vf, port, state); 1776 } 1777 EXPORT_SYMBOL(ib_set_vf_link_state); 1778 1779 int ib_get_vf_config(struct ib_device *device, int vf, u8 port, 1780 struct ifla_vf_info *info) 1781 { 1782 if (!device->get_vf_config) 1783 return -ENOSYS; 1784 1785 return device->get_vf_config(device, vf, port, info); 1786 } 1787 EXPORT_SYMBOL(ib_get_vf_config); 1788 1789 int ib_get_vf_stats(struct ib_device *device, int vf, u8 port, 1790 struct ifla_vf_stats *stats) 1791 { 1792 if (!device->get_vf_stats) 1793 return -ENOSYS; 1794 1795 return device->get_vf_stats(device, vf, port, stats); 1796 } 1797 EXPORT_SYMBOL(ib_get_vf_stats); 1798 1799 int ib_set_vf_guid(struct ib_device *device, int vf, u8 port, u64 guid, 1800 int type) 1801 { 1802 if (!device->set_vf_guid) 1803 return -ENOSYS; 1804 1805 return device->set_vf_guid(device, vf, port, guid, type); 1806 } 1807 EXPORT_SYMBOL(ib_set_vf_guid); 1808 1809 /** 1810 * ib_map_mr_sg() - Map the largest prefix of a dma mapped SG list 1811 * and set it the memory region. 1812 * @mr: memory region 1813 * @sg: dma mapped scatterlist 1814 * @sg_nents: number of entries in sg 1815 * @sg_offset: offset in bytes into sg 1816 * @page_size: page vector desired page size 1817 * 1818 * Constraints: 1819 * - The first sg element is allowed to have an offset. 1820 * - Each sg element must either be aligned to page_size or virtually 1821 * contiguous to the previous element. In case an sg element has a 1822 * non-contiguous offset, the mapping prefix will not include it. 1823 * - The last sg element is allowed to have length less than page_size. 1824 * - If sg_nents total byte length exceeds the mr max_num_sge * page_size 1825 * then only max_num_sg entries will be mapped. 1826 * - If the MR was allocated with type IB_MR_TYPE_SG_GAPS, none of these 1827 * constraints holds and the page_size argument is ignored. 1828 * 1829 * Returns the number of sg elements that were mapped to the memory region. 1830 * 1831 * After this completes successfully, the memory region 1832 * is ready for registration. 1833 */ 1834 int ib_map_mr_sg(struct ib_mr *mr, struct scatterlist *sg, int sg_nents, 1835 unsigned int *sg_offset, unsigned int page_size) 1836 { 1837 if (unlikely(!mr->device->map_mr_sg)) 1838 return -ENOSYS; 1839 1840 mr->page_size = page_size; 1841 1842 return mr->device->map_mr_sg(mr, sg, sg_nents, sg_offset); 1843 } 1844 EXPORT_SYMBOL(ib_map_mr_sg); 1845 1846 /** 1847 * ib_sg_to_pages() - Convert the largest prefix of a sg list 1848 * to a page vector 1849 * @mr: memory region 1850 * @sgl: dma mapped scatterlist 1851 * @sg_nents: number of entries in sg 1852 * @sg_offset_p: IN: start offset in bytes into sg 1853 * OUT: offset in bytes for element n of the sg of the first 1854 * byte that has not been processed where n is the return 1855 * value of this function. 1856 * @set_page: driver page assignment function pointer 1857 * 1858 * Core service helper for drivers to convert the largest 1859 * prefix of given sg list to a page vector. The sg list 1860 * prefix converted is the prefix that meet the requirements 1861 * of ib_map_mr_sg. 1862 * 1863 * Returns the number of sg elements that were assigned to 1864 * a page vector. 1865 */ 1866 int ib_sg_to_pages(struct ib_mr *mr, struct scatterlist *sgl, int sg_nents, 1867 unsigned int *sg_offset_p, int (*set_page)(struct ib_mr *, u64)) 1868 { 1869 struct scatterlist *sg; 1870 u64 last_end_dma_addr = 0; 1871 unsigned int sg_offset = sg_offset_p ? *sg_offset_p : 0; 1872 unsigned int last_page_off = 0; 1873 u64 page_mask = ~((u64)mr->page_size - 1); 1874 int i, ret; 1875 1876 if (unlikely(sg_nents <= 0 || sg_offset > sg_dma_len(&sgl[0]))) 1877 return -EINVAL; 1878 1879 mr->iova = sg_dma_address(&sgl[0]) + sg_offset; 1880 mr->length = 0; 1881 1882 for_each_sg(sgl, sg, sg_nents, i) { 1883 u64 dma_addr = sg_dma_address(sg) + sg_offset; 1884 u64 prev_addr = dma_addr; 1885 unsigned int dma_len = sg_dma_len(sg) - sg_offset; 1886 u64 end_dma_addr = dma_addr + dma_len; 1887 u64 page_addr = dma_addr & page_mask; 1888 1889 /* 1890 * For the second and later elements, check whether either the 1891 * end of element i-1 or the start of element i is not aligned 1892 * on a page boundary. 1893 */ 1894 if (i && (last_page_off != 0 || page_addr != dma_addr)) { 1895 /* Stop mapping if there is a gap. */ 1896 if (last_end_dma_addr != dma_addr) 1897 break; 1898 1899 /* 1900 * Coalesce this element with the last. If it is small 1901 * enough just update mr->length. Otherwise start 1902 * mapping from the next page. 1903 */ 1904 goto next_page; 1905 } 1906 1907 do { 1908 ret = set_page(mr, page_addr); 1909 if (unlikely(ret < 0)) { 1910 sg_offset = prev_addr - sg_dma_address(sg); 1911 mr->length += prev_addr - dma_addr; 1912 if (sg_offset_p) 1913 *sg_offset_p = sg_offset; 1914 return i || sg_offset ? i : ret; 1915 } 1916 prev_addr = page_addr; 1917 next_page: 1918 page_addr += mr->page_size; 1919 } while (page_addr < end_dma_addr); 1920 1921 mr->length += dma_len; 1922 last_end_dma_addr = end_dma_addr; 1923 last_page_off = end_dma_addr & ~page_mask; 1924 1925 sg_offset = 0; 1926 } 1927 1928 if (sg_offset_p) 1929 *sg_offset_p = 0; 1930 return i; 1931 } 1932 EXPORT_SYMBOL(ib_sg_to_pages); 1933 1934 struct ib_drain_cqe { 1935 struct ib_cqe cqe; 1936 struct completion done; 1937 }; 1938 1939 static void ib_drain_qp_done(struct ib_cq *cq, struct ib_wc *wc) 1940 { 1941 struct ib_drain_cqe *cqe = container_of(wc->wr_cqe, struct ib_drain_cqe, 1942 cqe); 1943 1944 complete(&cqe->done); 1945 } 1946 1947 /* 1948 * Post a WR and block until its completion is reaped for the SQ. 1949 */ 1950 static void __ib_drain_sq(struct ib_qp *qp) 1951 { 1952 struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR }; 1953 struct ib_drain_cqe sdrain; 1954 struct ib_send_wr swr = {}, *bad_swr; 1955 int ret; 1956 1957 if (qp->send_cq->poll_ctx == IB_POLL_DIRECT) { 1958 WARN_ONCE(qp->send_cq->poll_ctx == IB_POLL_DIRECT, 1959 "IB_POLL_DIRECT poll_ctx not supported for drain\n"); 1960 return; 1961 } 1962 1963 swr.wr_cqe = &sdrain.cqe; 1964 sdrain.cqe.done = ib_drain_qp_done; 1965 init_completion(&sdrain.done); 1966 1967 ret = ib_modify_qp(qp, &attr, IB_QP_STATE); 1968 if (ret) { 1969 WARN_ONCE(ret, "failed to drain send queue: %d\n", ret); 1970 return; 1971 } 1972 1973 ret = ib_post_send(qp, &swr, &bad_swr); 1974 if (ret) { 1975 WARN_ONCE(ret, "failed to drain send queue: %d\n", ret); 1976 return; 1977 } 1978 1979 wait_for_completion(&sdrain.done); 1980 } 1981 1982 /* 1983 * Post a WR and block until its completion is reaped for the RQ. 1984 */ 1985 static void __ib_drain_rq(struct ib_qp *qp) 1986 { 1987 struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR }; 1988 struct ib_drain_cqe rdrain; 1989 struct ib_recv_wr rwr = {}, *bad_rwr; 1990 int ret; 1991 1992 if (qp->recv_cq->poll_ctx == IB_POLL_DIRECT) { 1993 WARN_ONCE(qp->recv_cq->poll_ctx == IB_POLL_DIRECT, 1994 "IB_POLL_DIRECT poll_ctx not supported for drain\n"); 1995 return; 1996 } 1997 1998 rwr.wr_cqe = &rdrain.cqe; 1999 rdrain.cqe.done = ib_drain_qp_done; 2000 init_completion(&rdrain.done); 2001 2002 ret = ib_modify_qp(qp, &attr, IB_QP_STATE); 2003 if (ret) { 2004 WARN_ONCE(ret, "failed to drain recv queue: %d\n", ret); 2005 return; 2006 } 2007 2008 ret = ib_post_recv(qp, &rwr, &bad_rwr); 2009 if (ret) { 2010 WARN_ONCE(ret, "failed to drain recv queue: %d\n", ret); 2011 return; 2012 } 2013 2014 wait_for_completion(&rdrain.done); 2015 } 2016 2017 /** 2018 * ib_drain_sq() - Block until all SQ CQEs have been consumed by the 2019 * application. 2020 * @qp: queue pair to drain 2021 * 2022 * If the device has a provider-specific drain function, then 2023 * call that. Otherwise call the generic drain function 2024 * __ib_drain_sq(). 2025 * 2026 * The caller must: 2027 * 2028 * ensure there is room in the CQ and SQ for the drain work request and 2029 * completion. 2030 * 2031 * allocate the CQ using ib_alloc_cq() and the CQ poll context cannot be 2032 * IB_POLL_DIRECT. 2033 * 2034 * ensure that there are no other contexts that are posting WRs concurrently. 2035 * Otherwise the drain is not guaranteed. 2036 */ 2037 void ib_drain_sq(struct ib_qp *qp) 2038 { 2039 if (qp->device->drain_sq) 2040 qp->device->drain_sq(qp); 2041 else 2042 __ib_drain_sq(qp); 2043 } 2044 EXPORT_SYMBOL(ib_drain_sq); 2045 2046 /** 2047 * ib_drain_rq() - Block until all RQ CQEs have been consumed by the 2048 * application. 2049 * @qp: queue pair to drain 2050 * 2051 * If the device has a provider-specific drain function, then 2052 * call that. Otherwise call the generic drain function 2053 * __ib_drain_rq(). 2054 * 2055 * The caller must: 2056 * 2057 * ensure there is room in the CQ and RQ for the drain work request and 2058 * completion. 2059 * 2060 * allocate the CQ using ib_alloc_cq() and the CQ poll context cannot be 2061 * IB_POLL_DIRECT. 2062 * 2063 * ensure that there are no other contexts that are posting WRs concurrently. 2064 * Otherwise the drain is not guaranteed. 2065 */ 2066 void ib_drain_rq(struct ib_qp *qp) 2067 { 2068 if (qp->device->drain_rq) 2069 qp->device->drain_rq(qp); 2070 else 2071 __ib_drain_rq(qp); 2072 } 2073 EXPORT_SYMBOL(ib_drain_rq); 2074 2075 /** 2076 * ib_drain_qp() - Block until all CQEs have been consumed by the 2077 * application on both the RQ and SQ. 2078 * @qp: queue pair to drain 2079 * 2080 * The caller must: 2081 * 2082 * ensure there is room in the CQ(s), SQ, and RQ for drain work requests 2083 * and completions. 2084 * 2085 * allocate the CQs using ib_alloc_cq() and the CQ poll context cannot be 2086 * IB_POLL_DIRECT. 2087 * 2088 * ensure that there are no other contexts that are posting WRs concurrently. 2089 * Otherwise the drain is not guaranteed. 2090 */ 2091 void ib_drain_qp(struct ib_qp *qp) 2092 { 2093 ib_drain_sq(qp); 2094 if (!qp->srq) 2095 ib_drain_rq(qp); 2096 } 2097 EXPORT_SYMBOL(ib_drain_qp); 2098