1 /* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved. 4 * Copyright (c) 2006 Intel Corporation. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 */ 34 35 #include <linux/module.h> 36 #include <linux/init.h> 37 #include <linux/err.h> 38 #include <linux/random.h> 39 #include <linux/spinlock.h> 40 #include <linux/slab.h> 41 #include <linux/dma-mapping.h> 42 #include <linux/kref.h> 43 #include <linux/idr.h> 44 #include <linux/workqueue.h> 45 #include <uapi/linux/if_ether.h> 46 #include <rdma/ib_pack.h> 47 #include <rdma/ib_cache.h> 48 #include <rdma/rdma_netlink.h> 49 #include <net/netlink.h> 50 #include <uapi/rdma/ib_user_sa.h> 51 #include <rdma/ib_marshall.h> 52 #include <rdma/ib_addr.h> 53 #include "sa.h" 54 #include "core_priv.h" 55 56 MODULE_AUTHOR("Roland Dreier"); 57 MODULE_DESCRIPTION("InfiniBand subnet administration query support"); 58 MODULE_LICENSE("Dual BSD/GPL"); 59 60 #define IB_SA_LOCAL_SVC_TIMEOUT_MIN 100 61 #define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT 2000 62 #define IB_SA_LOCAL_SVC_TIMEOUT_MAX 200000 63 static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT; 64 65 struct ib_sa_sm_ah { 66 struct ib_ah *ah; 67 struct kref ref; 68 u16 pkey_index; 69 u8 src_path_mask; 70 }; 71 72 struct ib_sa_port { 73 struct ib_mad_agent *agent; 74 struct ib_sa_sm_ah *sm_ah; 75 struct work_struct update_task; 76 spinlock_t ah_lock; 77 u8 port_num; 78 }; 79 80 struct ib_sa_device { 81 int start_port, end_port; 82 struct ib_event_handler event_handler; 83 struct ib_sa_port port[0]; 84 }; 85 86 struct ib_sa_query { 87 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *); 88 void (*release)(struct ib_sa_query *); 89 struct ib_sa_client *client; 90 struct ib_sa_port *port; 91 struct ib_mad_send_buf *mad_buf; 92 struct ib_sa_sm_ah *sm_ah; 93 int id; 94 u32 flags; 95 struct list_head list; /* Local svc request list */ 96 u32 seq; /* Local svc request sequence number */ 97 unsigned long timeout; /* Local svc timeout */ 98 u8 path_use; /* How will the pathrecord be used */ 99 }; 100 101 #define IB_SA_ENABLE_LOCAL_SERVICE 0x00000001 102 #define IB_SA_CANCEL 0x00000002 103 104 struct ib_sa_service_query { 105 void (*callback)(int, struct ib_sa_service_rec *, void *); 106 void *context; 107 struct ib_sa_query sa_query; 108 }; 109 110 struct ib_sa_path_query { 111 void (*callback)(int, struct ib_sa_path_rec *, void *); 112 void *context; 113 struct ib_sa_query sa_query; 114 }; 115 116 struct ib_sa_guidinfo_query { 117 void (*callback)(int, struct ib_sa_guidinfo_rec *, void *); 118 void *context; 119 struct ib_sa_query sa_query; 120 }; 121 122 struct ib_sa_mcmember_query { 123 void (*callback)(int, struct ib_sa_mcmember_rec *, void *); 124 void *context; 125 struct ib_sa_query sa_query; 126 }; 127 128 static LIST_HEAD(ib_nl_request_list); 129 static DEFINE_SPINLOCK(ib_nl_request_lock); 130 static atomic_t ib_nl_sa_request_seq; 131 static struct workqueue_struct *ib_nl_wq; 132 static struct delayed_work ib_nl_timed_work; 133 static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = { 134 [LS_NLA_TYPE_PATH_RECORD] = {.type = NLA_BINARY, 135 .len = sizeof(struct ib_path_rec_data)}, 136 [LS_NLA_TYPE_TIMEOUT] = {.type = NLA_U32}, 137 [LS_NLA_TYPE_SERVICE_ID] = {.type = NLA_U64}, 138 [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY, 139 .len = sizeof(struct rdma_nla_ls_gid)}, 140 [LS_NLA_TYPE_SGID] = {.type = NLA_BINARY, 141 .len = sizeof(struct rdma_nla_ls_gid)}, 142 [LS_NLA_TYPE_TCLASS] = {.type = NLA_U8}, 143 [LS_NLA_TYPE_PKEY] = {.type = NLA_U16}, 144 [LS_NLA_TYPE_QOS_CLASS] = {.type = NLA_U16}, 145 }; 146 147 148 static void ib_sa_add_one(struct ib_device *device); 149 static void ib_sa_remove_one(struct ib_device *device, void *client_data); 150 151 static struct ib_client sa_client = { 152 .name = "sa", 153 .add = ib_sa_add_one, 154 .remove = ib_sa_remove_one 155 }; 156 157 static DEFINE_SPINLOCK(idr_lock); 158 static DEFINE_IDR(query_idr); 159 160 static DEFINE_SPINLOCK(tid_lock); 161 static u32 tid; 162 163 #define PATH_REC_FIELD(field) \ 164 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \ 165 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \ 166 .field_name = "sa_path_rec:" #field 167 168 static const struct ib_field path_rec_table[] = { 169 { PATH_REC_FIELD(service_id), 170 .offset_words = 0, 171 .offset_bits = 0, 172 .size_bits = 64 }, 173 { PATH_REC_FIELD(dgid), 174 .offset_words = 2, 175 .offset_bits = 0, 176 .size_bits = 128 }, 177 { PATH_REC_FIELD(sgid), 178 .offset_words = 6, 179 .offset_bits = 0, 180 .size_bits = 128 }, 181 { PATH_REC_FIELD(dlid), 182 .offset_words = 10, 183 .offset_bits = 0, 184 .size_bits = 16 }, 185 { PATH_REC_FIELD(slid), 186 .offset_words = 10, 187 .offset_bits = 16, 188 .size_bits = 16 }, 189 { PATH_REC_FIELD(raw_traffic), 190 .offset_words = 11, 191 .offset_bits = 0, 192 .size_bits = 1 }, 193 { RESERVED, 194 .offset_words = 11, 195 .offset_bits = 1, 196 .size_bits = 3 }, 197 { PATH_REC_FIELD(flow_label), 198 .offset_words = 11, 199 .offset_bits = 4, 200 .size_bits = 20 }, 201 { PATH_REC_FIELD(hop_limit), 202 .offset_words = 11, 203 .offset_bits = 24, 204 .size_bits = 8 }, 205 { PATH_REC_FIELD(traffic_class), 206 .offset_words = 12, 207 .offset_bits = 0, 208 .size_bits = 8 }, 209 { PATH_REC_FIELD(reversible), 210 .offset_words = 12, 211 .offset_bits = 8, 212 .size_bits = 1 }, 213 { PATH_REC_FIELD(numb_path), 214 .offset_words = 12, 215 .offset_bits = 9, 216 .size_bits = 7 }, 217 { PATH_REC_FIELD(pkey), 218 .offset_words = 12, 219 .offset_bits = 16, 220 .size_bits = 16 }, 221 { PATH_REC_FIELD(qos_class), 222 .offset_words = 13, 223 .offset_bits = 0, 224 .size_bits = 12 }, 225 { PATH_REC_FIELD(sl), 226 .offset_words = 13, 227 .offset_bits = 12, 228 .size_bits = 4 }, 229 { PATH_REC_FIELD(mtu_selector), 230 .offset_words = 13, 231 .offset_bits = 16, 232 .size_bits = 2 }, 233 { PATH_REC_FIELD(mtu), 234 .offset_words = 13, 235 .offset_bits = 18, 236 .size_bits = 6 }, 237 { PATH_REC_FIELD(rate_selector), 238 .offset_words = 13, 239 .offset_bits = 24, 240 .size_bits = 2 }, 241 { PATH_REC_FIELD(rate), 242 .offset_words = 13, 243 .offset_bits = 26, 244 .size_bits = 6 }, 245 { PATH_REC_FIELD(packet_life_time_selector), 246 .offset_words = 14, 247 .offset_bits = 0, 248 .size_bits = 2 }, 249 { PATH_REC_FIELD(packet_life_time), 250 .offset_words = 14, 251 .offset_bits = 2, 252 .size_bits = 6 }, 253 { PATH_REC_FIELD(preference), 254 .offset_words = 14, 255 .offset_bits = 8, 256 .size_bits = 8 }, 257 { RESERVED, 258 .offset_words = 14, 259 .offset_bits = 16, 260 .size_bits = 48 }, 261 }; 262 263 #define MCMEMBER_REC_FIELD(field) \ 264 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \ 265 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \ 266 .field_name = "sa_mcmember_rec:" #field 267 268 static const struct ib_field mcmember_rec_table[] = { 269 { MCMEMBER_REC_FIELD(mgid), 270 .offset_words = 0, 271 .offset_bits = 0, 272 .size_bits = 128 }, 273 { MCMEMBER_REC_FIELD(port_gid), 274 .offset_words = 4, 275 .offset_bits = 0, 276 .size_bits = 128 }, 277 { MCMEMBER_REC_FIELD(qkey), 278 .offset_words = 8, 279 .offset_bits = 0, 280 .size_bits = 32 }, 281 { MCMEMBER_REC_FIELD(mlid), 282 .offset_words = 9, 283 .offset_bits = 0, 284 .size_bits = 16 }, 285 { MCMEMBER_REC_FIELD(mtu_selector), 286 .offset_words = 9, 287 .offset_bits = 16, 288 .size_bits = 2 }, 289 { MCMEMBER_REC_FIELD(mtu), 290 .offset_words = 9, 291 .offset_bits = 18, 292 .size_bits = 6 }, 293 { MCMEMBER_REC_FIELD(traffic_class), 294 .offset_words = 9, 295 .offset_bits = 24, 296 .size_bits = 8 }, 297 { MCMEMBER_REC_FIELD(pkey), 298 .offset_words = 10, 299 .offset_bits = 0, 300 .size_bits = 16 }, 301 { MCMEMBER_REC_FIELD(rate_selector), 302 .offset_words = 10, 303 .offset_bits = 16, 304 .size_bits = 2 }, 305 { MCMEMBER_REC_FIELD(rate), 306 .offset_words = 10, 307 .offset_bits = 18, 308 .size_bits = 6 }, 309 { MCMEMBER_REC_FIELD(packet_life_time_selector), 310 .offset_words = 10, 311 .offset_bits = 24, 312 .size_bits = 2 }, 313 { MCMEMBER_REC_FIELD(packet_life_time), 314 .offset_words = 10, 315 .offset_bits = 26, 316 .size_bits = 6 }, 317 { MCMEMBER_REC_FIELD(sl), 318 .offset_words = 11, 319 .offset_bits = 0, 320 .size_bits = 4 }, 321 { MCMEMBER_REC_FIELD(flow_label), 322 .offset_words = 11, 323 .offset_bits = 4, 324 .size_bits = 20 }, 325 { MCMEMBER_REC_FIELD(hop_limit), 326 .offset_words = 11, 327 .offset_bits = 24, 328 .size_bits = 8 }, 329 { MCMEMBER_REC_FIELD(scope), 330 .offset_words = 12, 331 .offset_bits = 0, 332 .size_bits = 4 }, 333 { MCMEMBER_REC_FIELD(join_state), 334 .offset_words = 12, 335 .offset_bits = 4, 336 .size_bits = 4 }, 337 { MCMEMBER_REC_FIELD(proxy_join), 338 .offset_words = 12, 339 .offset_bits = 8, 340 .size_bits = 1 }, 341 { RESERVED, 342 .offset_words = 12, 343 .offset_bits = 9, 344 .size_bits = 23 }, 345 }; 346 347 #define SERVICE_REC_FIELD(field) \ 348 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \ 349 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \ 350 .field_name = "sa_service_rec:" #field 351 352 static const struct ib_field service_rec_table[] = { 353 { SERVICE_REC_FIELD(id), 354 .offset_words = 0, 355 .offset_bits = 0, 356 .size_bits = 64 }, 357 { SERVICE_REC_FIELD(gid), 358 .offset_words = 2, 359 .offset_bits = 0, 360 .size_bits = 128 }, 361 { SERVICE_REC_FIELD(pkey), 362 .offset_words = 6, 363 .offset_bits = 0, 364 .size_bits = 16 }, 365 { SERVICE_REC_FIELD(lease), 366 .offset_words = 7, 367 .offset_bits = 0, 368 .size_bits = 32 }, 369 { SERVICE_REC_FIELD(key), 370 .offset_words = 8, 371 .offset_bits = 0, 372 .size_bits = 128 }, 373 { SERVICE_REC_FIELD(name), 374 .offset_words = 12, 375 .offset_bits = 0, 376 .size_bits = 64*8 }, 377 { SERVICE_REC_FIELD(data8), 378 .offset_words = 28, 379 .offset_bits = 0, 380 .size_bits = 16*8 }, 381 { SERVICE_REC_FIELD(data16), 382 .offset_words = 32, 383 .offset_bits = 0, 384 .size_bits = 8*16 }, 385 { SERVICE_REC_FIELD(data32), 386 .offset_words = 36, 387 .offset_bits = 0, 388 .size_bits = 4*32 }, 389 { SERVICE_REC_FIELD(data64), 390 .offset_words = 40, 391 .offset_bits = 0, 392 .size_bits = 2*64 }, 393 }; 394 395 #define GUIDINFO_REC_FIELD(field) \ 396 .struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field), \ 397 .struct_size_bytes = sizeof((struct ib_sa_guidinfo_rec *) 0)->field, \ 398 .field_name = "sa_guidinfo_rec:" #field 399 400 static const struct ib_field guidinfo_rec_table[] = { 401 { GUIDINFO_REC_FIELD(lid), 402 .offset_words = 0, 403 .offset_bits = 0, 404 .size_bits = 16 }, 405 { GUIDINFO_REC_FIELD(block_num), 406 .offset_words = 0, 407 .offset_bits = 16, 408 .size_bits = 8 }, 409 { GUIDINFO_REC_FIELD(res1), 410 .offset_words = 0, 411 .offset_bits = 24, 412 .size_bits = 8 }, 413 { GUIDINFO_REC_FIELD(res2), 414 .offset_words = 1, 415 .offset_bits = 0, 416 .size_bits = 32 }, 417 { GUIDINFO_REC_FIELD(guid_info_list), 418 .offset_words = 2, 419 .offset_bits = 0, 420 .size_bits = 512 }, 421 }; 422 423 static inline void ib_sa_disable_local_svc(struct ib_sa_query *query) 424 { 425 query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE; 426 } 427 428 static inline int ib_sa_query_cancelled(struct ib_sa_query *query) 429 { 430 return (query->flags & IB_SA_CANCEL); 431 } 432 433 static void ib_nl_set_path_rec_attrs(struct sk_buff *skb, 434 struct ib_sa_query *query) 435 { 436 struct ib_sa_path_rec *sa_rec = query->mad_buf->context[1]; 437 struct ib_sa_mad *mad = query->mad_buf->mad; 438 ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask; 439 u16 val16; 440 u64 val64; 441 struct rdma_ls_resolve_header *header; 442 443 query->mad_buf->context[1] = NULL; 444 445 /* Construct the family header first */ 446 header = (struct rdma_ls_resolve_header *) 447 skb_put(skb, NLMSG_ALIGN(sizeof(*header))); 448 memcpy(header->device_name, query->port->agent->device->name, 449 LS_DEVICE_NAME_MAX); 450 header->port_num = query->port->port_num; 451 452 if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) && 453 sa_rec->reversible != 0) 454 query->path_use = LS_RESOLVE_PATH_USE_GMP; 455 else 456 query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL; 457 header->path_use = query->path_use; 458 459 /* Now build the attributes */ 460 if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) { 461 val64 = be64_to_cpu(sa_rec->service_id); 462 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID, 463 sizeof(val64), &val64); 464 } 465 if (comp_mask & IB_SA_PATH_REC_DGID) 466 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID, 467 sizeof(sa_rec->dgid), &sa_rec->dgid); 468 if (comp_mask & IB_SA_PATH_REC_SGID) 469 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID, 470 sizeof(sa_rec->sgid), &sa_rec->sgid); 471 if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS) 472 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS, 473 sizeof(sa_rec->traffic_class), &sa_rec->traffic_class); 474 475 if (comp_mask & IB_SA_PATH_REC_PKEY) { 476 val16 = be16_to_cpu(sa_rec->pkey); 477 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY, 478 sizeof(val16), &val16); 479 } 480 if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) { 481 val16 = be16_to_cpu(sa_rec->qos_class); 482 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS, 483 sizeof(val16), &val16); 484 } 485 } 486 487 static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask) 488 { 489 int len = 0; 490 491 if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) 492 len += nla_total_size(sizeof(u64)); 493 if (comp_mask & IB_SA_PATH_REC_DGID) 494 len += nla_total_size(sizeof(struct rdma_nla_ls_gid)); 495 if (comp_mask & IB_SA_PATH_REC_SGID) 496 len += nla_total_size(sizeof(struct rdma_nla_ls_gid)); 497 if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS) 498 len += nla_total_size(sizeof(u8)); 499 if (comp_mask & IB_SA_PATH_REC_PKEY) 500 len += nla_total_size(sizeof(u16)); 501 if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) 502 len += nla_total_size(sizeof(u16)); 503 504 /* 505 * Make sure that at least some of the required comp_mask bits are 506 * set. 507 */ 508 if (WARN_ON(len == 0)) 509 return len; 510 511 /* Add the family header */ 512 len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header)); 513 514 return len; 515 } 516 517 static int ib_nl_send_msg(struct ib_sa_query *query, gfp_t gfp_mask) 518 { 519 struct sk_buff *skb = NULL; 520 struct nlmsghdr *nlh; 521 void *data; 522 int ret = 0; 523 struct ib_sa_mad *mad; 524 int len; 525 526 mad = query->mad_buf->mad; 527 len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask); 528 if (len <= 0) 529 return -EMSGSIZE; 530 531 skb = nlmsg_new(len, gfp_mask); 532 if (!skb) 533 return -ENOMEM; 534 535 /* Put nlmsg header only for now */ 536 data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS, 537 RDMA_NL_LS_OP_RESOLVE, NLM_F_REQUEST); 538 if (!data) { 539 kfree_skb(skb); 540 return -EMSGSIZE; 541 } 542 543 /* Add attributes */ 544 ib_nl_set_path_rec_attrs(skb, query); 545 546 /* Repair the nlmsg header length */ 547 nlmsg_end(skb, nlh); 548 549 ret = ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, gfp_mask); 550 if (!ret) 551 ret = len; 552 else 553 ret = 0; 554 555 return ret; 556 } 557 558 static int ib_nl_make_request(struct ib_sa_query *query, gfp_t gfp_mask) 559 { 560 unsigned long flags; 561 unsigned long delay; 562 int ret; 563 564 INIT_LIST_HEAD(&query->list); 565 query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq); 566 567 /* Put the request on the list first.*/ 568 spin_lock_irqsave(&ib_nl_request_lock, flags); 569 delay = msecs_to_jiffies(sa_local_svc_timeout_ms); 570 query->timeout = delay + jiffies; 571 list_add_tail(&query->list, &ib_nl_request_list); 572 /* Start the timeout if this is the only request */ 573 if (ib_nl_request_list.next == &query->list) 574 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay); 575 spin_unlock_irqrestore(&ib_nl_request_lock, flags); 576 577 ret = ib_nl_send_msg(query, gfp_mask); 578 if (ret <= 0) { 579 ret = -EIO; 580 /* Remove the request */ 581 spin_lock_irqsave(&ib_nl_request_lock, flags); 582 list_del(&query->list); 583 spin_unlock_irqrestore(&ib_nl_request_lock, flags); 584 } else { 585 ret = 0; 586 } 587 588 return ret; 589 } 590 591 static int ib_nl_cancel_request(struct ib_sa_query *query) 592 { 593 unsigned long flags; 594 struct ib_sa_query *wait_query; 595 int found = 0; 596 597 spin_lock_irqsave(&ib_nl_request_lock, flags); 598 list_for_each_entry(wait_query, &ib_nl_request_list, list) { 599 /* Let the timeout to take care of the callback */ 600 if (query == wait_query) { 601 query->flags |= IB_SA_CANCEL; 602 query->timeout = jiffies; 603 list_move(&query->list, &ib_nl_request_list); 604 found = 1; 605 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1); 606 break; 607 } 608 } 609 spin_unlock_irqrestore(&ib_nl_request_lock, flags); 610 611 return found; 612 } 613 614 static void send_handler(struct ib_mad_agent *agent, 615 struct ib_mad_send_wc *mad_send_wc); 616 617 static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query, 618 const struct nlmsghdr *nlh) 619 { 620 struct ib_mad_send_wc mad_send_wc; 621 struct ib_sa_mad *mad = NULL; 622 const struct nlattr *head, *curr; 623 struct ib_path_rec_data *rec; 624 int len, rem; 625 u32 mask = 0; 626 int status = -EIO; 627 628 if (query->callback) { 629 head = (const struct nlattr *) nlmsg_data(nlh); 630 len = nlmsg_len(nlh); 631 switch (query->path_use) { 632 case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL: 633 mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND; 634 break; 635 636 case LS_RESOLVE_PATH_USE_ALL: 637 case LS_RESOLVE_PATH_USE_GMP: 638 default: 639 mask = IB_PATH_PRIMARY | IB_PATH_GMP | 640 IB_PATH_BIDIRECTIONAL; 641 break; 642 } 643 nla_for_each_attr(curr, head, len, rem) { 644 if (curr->nla_type == LS_NLA_TYPE_PATH_RECORD) { 645 rec = nla_data(curr); 646 /* 647 * Get the first one. In the future, we may 648 * need to get up to 6 pathrecords. 649 */ 650 if ((rec->flags & mask) == mask) { 651 mad = query->mad_buf->mad; 652 mad->mad_hdr.method |= 653 IB_MGMT_METHOD_RESP; 654 memcpy(mad->data, rec->path_rec, 655 sizeof(rec->path_rec)); 656 status = 0; 657 break; 658 } 659 } 660 } 661 query->callback(query, status, mad); 662 } 663 664 mad_send_wc.send_buf = query->mad_buf; 665 mad_send_wc.status = IB_WC_SUCCESS; 666 send_handler(query->mad_buf->mad_agent, &mad_send_wc); 667 } 668 669 static void ib_nl_request_timeout(struct work_struct *work) 670 { 671 unsigned long flags; 672 struct ib_sa_query *query; 673 unsigned long delay; 674 struct ib_mad_send_wc mad_send_wc; 675 int ret; 676 677 spin_lock_irqsave(&ib_nl_request_lock, flags); 678 while (!list_empty(&ib_nl_request_list)) { 679 query = list_entry(ib_nl_request_list.next, 680 struct ib_sa_query, list); 681 682 if (time_after(query->timeout, jiffies)) { 683 delay = query->timeout - jiffies; 684 if ((long)delay <= 0) 685 delay = 1; 686 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay); 687 break; 688 } 689 690 list_del(&query->list); 691 ib_sa_disable_local_svc(query); 692 /* Hold the lock to protect against query cancellation */ 693 if (ib_sa_query_cancelled(query)) 694 ret = -1; 695 else 696 ret = ib_post_send_mad(query->mad_buf, NULL); 697 if (ret) { 698 mad_send_wc.send_buf = query->mad_buf; 699 mad_send_wc.status = IB_WC_WR_FLUSH_ERR; 700 spin_unlock_irqrestore(&ib_nl_request_lock, flags); 701 send_handler(query->port->agent, &mad_send_wc); 702 spin_lock_irqsave(&ib_nl_request_lock, flags); 703 } 704 } 705 spin_unlock_irqrestore(&ib_nl_request_lock, flags); 706 } 707 708 static int ib_nl_handle_set_timeout(struct sk_buff *skb, 709 struct netlink_callback *cb) 710 { 711 const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh; 712 int timeout, delta, abs_delta; 713 const struct nlattr *attr; 714 unsigned long flags; 715 struct ib_sa_query *query; 716 long delay = 0; 717 struct nlattr *tb[LS_NLA_TYPE_MAX]; 718 int ret; 719 720 if (!netlink_capable(skb, CAP_NET_ADMIN)) 721 return -EPERM; 722 723 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh), 724 nlmsg_len(nlh), ib_nl_policy); 725 attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT]; 726 if (ret || !attr) 727 goto settimeout_out; 728 729 timeout = *(int *) nla_data(attr); 730 if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN) 731 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN; 732 if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX) 733 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX; 734 735 delta = timeout - sa_local_svc_timeout_ms; 736 if (delta < 0) 737 abs_delta = -delta; 738 else 739 abs_delta = delta; 740 741 if (delta != 0) { 742 spin_lock_irqsave(&ib_nl_request_lock, flags); 743 sa_local_svc_timeout_ms = timeout; 744 list_for_each_entry(query, &ib_nl_request_list, list) { 745 if (delta < 0 && abs_delta > query->timeout) 746 query->timeout = 0; 747 else 748 query->timeout += delta; 749 750 /* Get the new delay from the first entry */ 751 if (!delay) { 752 delay = query->timeout - jiffies; 753 if (delay <= 0) 754 delay = 1; 755 } 756 } 757 if (delay) 758 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 759 (unsigned long)delay); 760 spin_unlock_irqrestore(&ib_nl_request_lock, flags); 761 } 762 763 settimeout_out: 764 return skb->len; 765 } 766 767 static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh) 768 { 769 struct nlattr *tb[LS_NLA_TYPE_MAX]; 770 int ret; 771 772 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR) 773 return 0; 774 775 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh), 776 nlmsg_len(nlh), ib_nl_policy); 777 if (ret) 778 return 0; 779 780 return 1; 781 } 782 783 static int ib_nl_handle_resolve_resp(struct sk_buff *skb, 784 struct netlink_callback *cb) 785 { 786 const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh; 787 unsigned long flags; 788 struct ib_sa_query *query; 789 struct ib_mad_send_buf *send_buf; 790 struct ib_mad_send_wc mad_send_wc; 791 int found = 0; 792 int ret; 793 794 if (!netlink_capable(skb, CAP_NET_ADMIN)) 795 return -EPERM; 796 797 spin_lock_irqsave(&ib_nl_request_lock, flags); 798 list_for_each_entry(query, &ib_nl_request_list, list) { 799 /* 800 * If the query is cancelled, let the timeout routine 801 * take care of it. 802 */ 803 if (nlh->nlmsg_seq == query->seq) { 804 found = !ib_sa_query_cancelled(query); 805 if (found) 806 list_del(&query->list); 807 break; 808 } 809 } 810 811 if (!found) { 812 spin_unlock_irqrestore(&ib_nl_request_lock, flags); 813 goto resp_out; 814 } 815 816 send_buf = query->mad_buf; 817 818 if (!ib_nl_is_good_resolve_resp(nlh)) { 819 /* if the result is a failure, send out the packet via IB */ 820 ib_sa_disable_local_svc(query); 821 ret = ib_post_send_mad(query->mad_buf, NULL); 822 spin_unlock_irqrestore(&ib_nl_request_lock, flags); 823 if (ret) { 824 mad_send_wc.send_buf = send_buf; 825 mad_send_wc.status = IB_WC_GENERAL_ERR; 826 send_handler(query->port->agent, &mad_send_wc); 827 } 828 } else { 829 spin_unlock_irqrestore(&ib_nl_request_lock, flags); 830 ib_nl_process_good_resolve_rsp(query, nlh); 831 } 832 833 resp_out: 834 return skb->len; 835 } 836 837 static struct ibnl_client_cbs ib_sa_cb_table[] = { 838 [RDMA_NL_LS_OP_RESOLVE] = { 839 .dump = ib_nl_handle_resolve_resp, 840 .module = THIS_MODULE }, 841 [RDMA_NL_LS_OP_SET_TIMEOUT] = { 842 .dump = ib_nl_handle_set_timeout, 843 .module = THIS_MODULE }, 844 }; 845 846 static void free_sm_ah(struct kref *kref) 847 { 848 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref); 849 850 ib_destroy_ah(sm_ah->ah); 851 kfree(sm_ah); 852 } 853 854 static void update_sm_ah(struct work_struct *work) 855 { 856 struct ib_sa_port *port = 857 container_of(work, struct ib_sa_port, update_task); 858 struct ib_sa_sm_ah *new_ah; 859 struct ib_port_attr port_attr; 860 struct ib_ah_attr ah_attr; 861 862 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) { 863 printk(KERN_WARNING "Couldn't query port\n"); 864 return; 865 } 866 867 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL); 868 if (!new_ah) { 869 printk(KERN_WARNING "Couldn't allocate new SM AH\n"); 870 return; 871 } 872 873 kref_init(&new_ah->ref); 874 new_ah->src_path_mask = (1 << port_attr.lmc) - 1; 875 876 new_ah->pkey_index = 0; 877 if (ib_find_pkey(port->agent->device, port->port_num, 878 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index)) 879 printk(KERN_ERR "Couldn't find index for default PKey\n"); 880 881 memset(&ah_attr, 0, sizeof ah_attr); 882 ah_attr.dlid = port_attr.sm_lid; 883 ah_attr.sl = port_attr.sm_sl; 884 ah_attr.port_num = port->port_num; 885 886 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr); 887 if (IS_ERR(new_ah->ah)) { 888 printk(KERN_WARNING "Couldn't create new SM AH\n"); 889 kfree(new_ah); 890 return; 891 } 892 893 spin_lock_irq(&port->ah_lock); 894 if (port->sm_ah) 895 kref_put(&port->sm_ah->ref, free_sm_ah); 896 port->sm_ah = new_ah; 897 spin_unlock_irq(&port->ah_lock); 898 899 } 900 901 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event) 902 { 903 if (event->event == IB_EVENT_PORT_ERR || 904 event->event == IB_EVENT_PORT_ACTIVE || 905 event->event == IB_EVENT_LID_CHANGE || 906 event->event == IB_EVENT_PKEY_CHANGE || 907 event->event == IB_EVENT_SM_CHANGE || 908 event->event == IB_EVENT_CLIENT_REREGISTER) { 909 unsigned long flags; 910 struct ib_sa_device *sa_dev = 911 container_of(handler, typeof(*sa_dev), event_handler); 912 struct ib_sa_port *port = 913 &sa_dev->port[event->element.port_num - sa_dev->start_port]; 914 915 if (!rdma_cap_ib_sa(handler->device, port->port_num)) 916 return; 917 918 spin_lock_irqsave(&port->ah_lock, flags); 919 if (port->sm_ah) 920 kref_put(&port->sm_ah->ref, free_sm_ah); 921 port->sm_ah = NULL; 922 spin_unlock_irqrestore(&port->ah_lock, flags); 923 924 queue_work(ib_wq, &sa_dev->port[event->element.port_num - 925 sa_dev->start_port].update_task); 926 } 927 } 928 929 void ib_sa_register_client(struct ib_sa_client *client) 930 { 931 atomic_set(&client->users, 1); 932 init_completion(&client->comp); 933 } 934 EXPORT_SYMBOL(ib_sa_register_client); 935 936 void ib_sa_unregister_client(struct ib_sa_client *client) 937 { 938 ib_sa_client_put(client); 939 wait_for_completion(&client->comp); 940 } 941 EXPORT_SYMBOL(ib_sa_unregister_client); 942 943 /** 944 * ib_sa_cancel_query - try to cancel an SA query 945 * @id:ID of query to cancel 946 * @query:query pointer to cancel 947 * 948 * Try to cancel an SA query. If the id and query don't match up or 949 * the query has already completed, nothing is done. Otherwise the 950 * query is canceled and will complete with a status of -EINTR. 951 */ 952 void ib_sa_cancel_query(int id, struct ib_sa_query *query) 953 { 954 unsigned long flags; 955 struct ib_mad_agent *agent; 956 struct ib_mad_send_buf *mad_buf; 957 958 spin_lock_irqsave(&idr_lock, flags); 959 if (idr_find(&query_idr, id) != query) { 960 spin_unlock_irqrestore(&idr_lock, flags); 961 return; 962 } 963 agent = query->port->agent; 964 mad_buf = query->mad_buf; 965 spin_unlock_irqrestore(&idr_lock, flags); 966 967 /* 968 * If the query is still on the netlink request list, schedule 969 * it to be cancelled by the timeout routine. Otherwise, it has been 970 * sent to the MAD layer and has to be cancelled from there. 971 */ 972 if (!ib_nl_cancel_request(query)) 973 ib_cancel_mad(agent, mad_buf); 974 } 975 EXPORT_SYMBOL(ib_sa_cancel_query); 976 977 static u8 get_src_path_mask(struct ib_device *device, u8 port_num) 978 { 979 struct ib_sa_device *sa_dev; 980 struct ib_sa_port *port; 981 unsigned long flags; 982 u8 src_path_mask; 983 984 sa_dev = ib_get_client_data(device, &sa_client); 985 if (!sa_dev) 986 return 0x7f; 987 988 port = &sa_dev->port[port_num - sa_dev->start_port]; 989 spin_lock_irqsave(&port->ah_lock, flags); 990 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f; 991 spin_unlock_irqrestore(&port->ah_lock, flags); 992 993 return src_path_mask; 994 } 995 996 int ib_init_ah_from_path(struct ib_device *device, u8 port_num, 997 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr) 998 { 999 int ret; 1000 u16 gid_index; 1001 int use_roce; 1002 struct net_device *ndev = NULL; 1003 1004 memset(ah_attr, 0, sizeof *ah_attr); 1005 ah_attr->dlid = be16_to_cpu(rec->dlid); 1006 ah_attr->sl = rec->sl; 1007 ah_attr->src_path_bits = be16_to_cpu(rec->slid) & 1008 get_src_path_mask(device, port_num); 1009 ah_attr->port_num = port_num; 1010 ah_attr->static_rate = rec->rate; 1011 1012 use_roce = rdma_cap_eth_ah(device, port_num); 1013 1014 if (use_roce) { 1015 struct net_device *idev; 1016 struct net_device *resolved_dev; 1017 struct rdma_dev_addr dev_addr = {.bound_dev_if = rec->ifindex, 1018 .net = rec->net ? rec->net : 1019 &init_net}; 1020 union { 1021 struct sockaddr _sockaddr; 1022 struct sockaddr_in _sockaddr_in; 1023 struct sockaddr_in6 _sockaddr_in6; 1024 } sgid_addr, dgid_addr; 1025 1026 if (!device->get_netdev) 1027 return -EOPNOTSUPP; 1028 1029 rdma_gid2ip(&sgid_addr._sockaddr, &rec->sgid); 1030 rdma_gid2ip(&dgid_addr._sockaddr, &rec->dgid); 1031 1032 /* validate the route */ 1033 ret = rdma_resolve_ip_route(&sgid_addr._sockaddr, 1034 &dgid_addr._sockaddr, &dev_addr); 1035 if (ret) 1036 return ret; 1037 1038 if ((dev_addr.network == RDMA_NETWORK_IPV4 || 1039 dev_addr.network == RDMA_NETWORK_IPV6) && 1040 rec->gid_type != IB_GID_TYPE_ROCE_UDP_ENCAP) 1041 return -EINVAL; 1042 1043 idev = device->get_netdev(device, port_num); 1044 if (!idev) 1045 return -ENODEV; 1046 1047 resolved_dev = dev_get_by_index(dev_addr.net, 1048 dev_addr.bound_dev_if); 1049 if (resolved_dev->flags & IFF_LOOPBACK) { 1050 dev_put(resolved_dev); 1051 resolved_dev = idev; 1052 dev_hold(resolved_dev); 1053 } 1054 ndev = ib_get_ndev_from_path(rec); 1055 rcu_read_lock(); 1056 if ((ndev && ndev != resolved_dev) || 1057 (resolved_dev != idev && 1058 !rdma_is_upper_dev_rcu(idev, resolved_dev))) 1059 ret = -EHOSTUNREACH; 1060 rcu_read_unlock(); 1061 dev_put(idev); 1062 dev_put(resolved_dev); 1063 if (ret) { 1064 if (ndev) 1065 dev_put(ndev); 1066 return ret; 1067 } 1068 } 1069 1070 if (rec->hop_limit > 1 || use_roce) { 1071 ah_attr->ah_flags = IB_AH_GRH; 1072 ah_attr->grh.dgid = rec->dgid; 1073 1074 ret = ib_find_cached_gid_by_port(device, &rec->sgid, 1075 rec->gid_type, port_num, ndev, 1076 &gid_index); 1077 if (ret) { 1078 if (ndev) 1079 dev_put(ndev); 1080 return ret; 1081 } 1082 1083 ah_attr->grh.sgid_index = gid_index; 1084 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label); 1085 ah_attr->grh.hop_limit = rec->hop_limit; 1086 ah_attr->grh.traffic_class = rec->traffic_class; 1087 if (ndev) 1088 dev_put(ndev); 1089 } 1090 1091 if (use_roce) 1092 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN); 1093 1094 return 0; 1095 } 1096 EXPORT_SYMBOL(ib_init_ah_from_path); 1097 1098 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask) 1099 { 1100 unsigned long flags; 1101 1102 spin_lock_irqsave(&query->port->ah_lock, flags); 1103 if (!query->port->sm_ah) { 1104 spin_unlock_irqrestore(&query->port->ah_lock, flags); 1105 return -EAGAIN; 1106 } 1107 kref_get(&query->port->sm_ah->ref); 1108 query->sm_ah = query->port->sm_ah; 1109 spin_unlock_irqrestore(&query->port->ah_lock, flags); 1110 1111 query->mad_buf = ib_create_send_mad(query->port->agent, 1, 1112 query->sm_ah->pkey_index, 1113 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA, 1114 gfp_mask, 1115 IB_MGMT_BASE_VERSION); 1116 if (IS_ERR(query->mad_buf)) { 1117 kref_put(&query->sm_ah->ref, free_sm_ah); 1118 return -ENOMEM; 1119 } 1120 1121 query->mad_buf->ah = query->sm_ah->ah; 1122 1123 return 0; 1124 } 1125 1126 static void free_mad(struct ib_sa_query *query) 1127 { 1128 ib_free_send_mad(query->mad_buf); 1129 kref_put(&query->sm_ah->ref, free_sm_ah); 1130 } 1131 1132 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent) 1133 { 1134 unsigned long flags; 1135 1136 memset(mad, 0, sizeof *mad); 1137 1138 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION; 1139 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 1140 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION; 1141 1142 spin_lock_irqsave(&tid_lock, flags); 1143 mad->mad_hdr.tid = 1144 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++); 1145 spin_unlock_irqrestore(&tid_lock, flags); 1146 } 1147 1148 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask) 1149 { 1150 bool preload = gfpflags_allow_blocking(gfp_mask); 1151 unsigned long flags; 1152 int ret, id; 1153 1154 if (preload) 1155 idr_preload(gfp_mask); 1156 spin_lock_irqsave(&idr_lock, flags); 1157 1158 id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT); 1159 1160 spin_unlock_irqrestore(&idr_lock, flags); 1161 if (preload) 1162 idr_preload_end(); 1163 if (id < 0) 1164 return id; 1165 1166 query->mad_buf->timeout_ms = timeout_ms; 1167 query->mad_buf->context[0] = query; 1168 query->id = id; 1169 1170 if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) { 1171 if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) { 1172 if (!ib_nl_make_request(query, gfp_mask)) 1173 return id; 1174 } 1175 ib_sa_disable_local_svc(query); 1176 } 1177 1178 ret = ib_post_send_mad(query->mad_buf, NULL); 1179 if (ret) { 1180 spin_lock_irqsave(&idr_lock, flags); 1181 idr_remove(&query_idr, id); 1182 spin_unlock_irqrestore(&idr_lock, flags); 1183 } 1184 1185 /* 1186 * It's not safe to dereference query any more, because the 1187 * send may already have completed and freed the query in 1188 * another context. 1189 */ 1190 return ret ? ret : id; 1191 } 1192 1193 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec) 1194 { 1195 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec); 1196 } 1197 EXPORT_SYMBOL(ib_sa_unpack_path); 1198 1199 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute) 1200 { 1201 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute); 1202 } 1203 EXPORT_SYMBOL(ib_sa_pack_path); 1204 1205 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query, 1206 int status, 1207 struct ib_sa_mad *mad) 1208 { 1209 struct ib_sa_path_query *query = 1210 container_of(sa_query, struct ib_sa_path_query, sa_query); 1211 1212 if (mad) { 1213 struct ib_sa_path_rec rec; 1214 1215 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), 1216 mad->data, &rec); 1217 rec.net = NULL; 1218 rec.ifindex = 0; 1219 rec.gid_type = IB_GID_TYPE_IB; 1220 memset(rec.dmac, 0, ETH_ALEN); 1221 query->callback(status, &rec, query->context); 1222 } else 1223 query->callback(status, NULL, query->context); 1224 } 1225 1226 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query) 1227 { 1228 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query)); 1229 } 1230 1231 /** 1232 * ib_sa_path_rec_get - Start a Path get query 1233 * @client:SA client 1234 * @device:device to send query on 1235 * @port_num: port number to send query on 1236 * @rec:Path Record to send in query 1237 * @comp_mask:component mask to send in query 1238 * @timeout_ms:time to wait for response 1239 * @gfp_mask:GFP mask to use for internal allocations 1240 * @callback:function called when query completes, times out or is 1241 * canceled 1242 * @context:opaque user context passed to callback 1243 * @sa_query:query context, used to cancel query 1244 * 1245 * Send a Path Record Get query to the SA to look up a path. The 1246 * callback function will be called when the query completes (or 1247 * fails); status is 0 for a successful response, -EINTR if the query 1248 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 1249 * occurred sending the query. The resp parameter of the callback is 1250 * only valid if status is 0. 1251 * 1252 * If the return value of ib_sa_path_rec_get() is negative, it is an 1253 * error code. Otherwise it is a query ID that can be used to cancel 1254 * the query. 1255 */ 1256 int ib_sa_path_rec_get(struct ib_sa_client *client, 1257 struct ib_device *device, u8 port_num, 1258 struct ib_sa_path_rec *rec, 1259 ib_sa_comp_mask comp_mask, 1260 int timeout_ms, gfp_t gfp_mask, 1261 void (*callback)(int status, 1262 struct ib_sa_path_rec *resp, 1263 void *context), 1264 void *context, 1265 struct ib_sa_query **sa_query) 1266 { 1267 struct ib_sa_path_query *query; 1268 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1269 struct ib_sa_port *port; 1270 struct ib_mad_agent *agent; 1271 struct ib_sa_mad *mad; 1272 int ret; 1273 1274 if (!sa_dev) 1275 return -ENODEV; 1276 1277 port = &sa_dev->port[port_num - sa_dev->start_port]; 1278 agent = port->agent; 1279 1280 query = kzalloc(sizeof(*query), gfp_mask); 1281 if (!query) 1282 return -ENOMEM; 1283 1284 query->sa_query.port = port; 1285 ret = alloc_mad(&query->sa_query, gfp_mask); 1286 if (ret) 1287 goto err1; 1288 1289 ib_sa_client_get(client); 1290 query->sa_query.client = client; 1291 query->callback = callback; 1292 query->context = context; 1293 1294 mad = query->sa_query.mad_buf->mad; 1295 init_mad(mad, agent); 1296 1297 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL; 1298 query->sa_query.release = ib_sa_path_rec_release; 1299 mad->mad_hdr.method = IB_MGMT_METHOD_GET; 1300 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC); 1301 mad->sa_hdr.comp_mask = comp_mask; 1302 1303 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data); 1304 1305 *sa_query = &query->sa_query; 1306 1307 query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE; 1308 query->sa_query.mad_buf->context[1] = rec; 1309 1310 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 1311 if (ret < 0) 1312 goto err2; 1313 1314 return ret; 1315 1316 err2: 1317 *sa_query = NULL; 1318 ib_sa_client_put(query->sa_query.client); 1319 free_mad(&query->sa_query); 1320 1321 err1: 1322 kfree(query); 1323 return ret; 1324 } 1325 EXPORT_SYMBOL(ib_sa_path_rec_get); 1326 1327 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query, 1328 int status, 1329 struct ib_sa_mad *mad) 1330 { 1331 struct ib_sa_service_query *query = 1332 container_of(sa_query, struct ib_sa_service_query, sa_query); 1333 1334 if (mad) { 1335 struct ib_sa_service_rec rec; 1336 1337 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table), 1338 mad->data, &rec); 1339 query->callback(status, &rec, query->context); 1340 } else 1341 query->callback(status, NULL, query->context); 1342 } 1343 1344 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query) 1345 { 1346 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query)); 1347 } 1348 1349 /** 1350 * ib_sa_service_rec_query - Start Service Record operation 1351 * @client:SA client 1352 * @device:device to send request on 1353 * @port_num: port number to send request on 1354 * @method:SA method - should be get, set, or delete 1355 * @rec:Service Record to send in request 1356 * @comp_mask:component mask to send in request 1357 * @timeout_ms:time to wait for response 1358 * @gfp_mask:GFP mask to use for internal allocations 1359 * @callback:function called when request completes, times out or is 1360 * canceled 1361 * @context:opaque user context passed to callback 1362 * @sa_query:request context, used to cancel request 1363 * 1364 * Send a Service Record set/get/delete to the SA to register, 1365 * unregister or query a service record. 1366 * The callback function will be called when the request completes (or 1367 * fails); status is 0 for a successful response, -EINTR if the query 1368 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 1369 * occurred sending the query. The resp parameter of the callback is 1370 * only valid if status is 0. 1371 * 1372 * If the return value of ib_sa_service_rec_query() is negative, it is an 1373 * error code. Otherwise it is a request ID that can be used to cancel 1374 * the query. 1375 */ 1376 int ib_sa_service_rec_query(struct ib_sa_client *client, 1377 struct ib_device *device, u8 port_num, u8 method, 1378 struct ib_sa_service_rec *rec, 1379 ib_sa_comp_mask comp_mask, 1380 int timeout_ms, gfp_t gfp_mask, 1381 void (*callback)(int status, 1382 struct ib_sa_service_rec *resp, 1383 void *context), 1384 void *context, 1385 struct ib_sa_query **sa_query) 1386 { 1387 struct ib_sa_service_query *query; 1388 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1389 struct ib_sa_port *port; 1390 struct ib_mad_agent *agent; 1391 struct ib_sa_mad *mad; 1392 int ret; 1393 1394 if (!sa_dev) 1395 return -ENODEV; 1396 1397 port = &sa_dev->port[port_num - sa_dev->start_port]; 1398 agent = port->agent; 1399 1400 if (method != IB_MGMT_METHOD_GET && 1401 method != IB_MGMT_METHOD_SET && 1402 method != IB_SA_METHOD_DELETE) 1403 return -EINVAL; 1404 1405 query = kzalloc(sizeof(*query), gfp_mask); 1406 if (!query) 1407 return -ENOMEM; 1408 1409 query->sa_query.port = port; 1410 ret = alloc_mad(&query->sa_query, gfp_mask); 1411 if (ret) 1412 goto err1; 1413 1414 ib_sa_client_get(client); 1415 query->sa_query.client = client; 1416 query->callback = callback; 1417 query->context = context; 1418 1419 mad = query->sa_query.mad_buf->mad; 1420 init_mad(mad, agent); 1421 1422 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL; 1423 query->sa_query.release = ib_sa_service_rec_release; 1424 mad->mad_hdr.method = method; 1425 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC); 1426 mad->sa_hdr.comp_mask = comp_mask; 1427 1428 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table), 1429 rec, mad->data); 1430 1431 *sa_query = &query->sa_query; 1432 1433 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 1434 if (ret < 0) 1435 goto err2; 1436 1437 return ret; 1438 1439 err2: 1440 *sa_query = NULL; 1441 ib_sa_client_put(query->sa_query.client); 1442 free_mad(&query->sa_query); 1443 1444 err1: 1445 kfree(query); 1446 return ret; 1447 } 1448 EXPORT_SYMBOL(ib_sa_service_rec_query); 1449 1450 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query, 1451 int status, 1452 struct ib_sa_mad *mad) 1453 { 1454 struct ib_sa_mcmember_query *query = 1455 container_of(sa_query, struct ib_sa_mcmember_query, sa_query); 1456 1457 if (mad) { 1458 struct ib_sa_mcmember_rec rec; 1459 1460 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 1461 mad->data, &rec); 1462 query->callback(status, &rec, query->context); 1463 } else 1464 query->callback(status, NULL, query->context); 1465 } 1466 1467 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query) 1468 { 1469 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query)); 1470 } 1471 1472 int ib_sa_mcmember_rec_query(struct ib_sa_client *client, 1473 struct ib_device *device, u8 port_num, 1474 u8 method, 1475 struct ib_sa_mcmember_rec *rec, 1476 ib_sa_comp_mask comp_mask, 1477 int timeout_ms, gfp_t gfp_mask, 1478 void (*callback)(int status, 1479 struct ib_sa_mcmember_rec *resp, 1480 void *context), 1481 void *context, 1482 struct ib_sa_query **sa_query) 1483 { 1484 struct ib_sa_mcmember_query *query; 1485 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1486 struct ib_sa_port *port; 1487 struct ib_mad_agent *agent; 1488 struct ib_sa_mad *mad; 1489 int ret; 1490 1491 if (!sa_dev) 1492 return -ENODEV; 1493 1494 port = &sa_dev->port[port_num - sa_dev->start_port]; 1495 agent = port->agent; 1496 1497 query = kzalloc(sizeof(*query), gfp_mask); 1498 if (!query) 1499 return -ENOMEM; 1500 1501 query->sa_query.port = port; 1502 ret = alloc_mad(&query->sa_query, gfp_mask); 1503 if (ret) 1504 goto err1; 1505 1506 ib_sa_client_get(client); 1507 query->sa_query.client = client; 1508 query->callback = callback; 1509 query->context = context; 1510 1511 mad = query->sa_query.mad_buf->mad; 1512 init_mad(mad, agent); 1513 1514 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL; 1515 query->sa_query.release = ib_sa_mcmember_rec_release; 1516 mad->mad_hdr.method = method; 1517 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 1518 mad->sa_hdr.comp_mask = comp_mask; 1519 1520 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 1521 rec, mad->data); 1522 1523 *sa_query = &query->sa_query; 1524 1525 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 1526 if (ret < 0) 1527 goto err2; 1528 1529 return ret; 1530 1531 err2: 1532 *sa_query = NULL; 1533 ib_sa_client_put(query->sa_query.client); 1534 free_mad(&query->sa_query); 1535 1536 err1: 1537 kfree(query); 1538 return ret; 1539 } 1540 1541 /* Support GuidInfoRecord */ 1542 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query, 1543 int status, 1544 struct ib_sa_mad *mad) 1545 { 1546 struct ib_sa_guidinfo_query *query = 1547 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query); 1548 1549 if (mad) { 1550 struct ib_sa_guidinfo_rec rec; 1551 1552 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), 1553 mad->data, &rec); 1554 query->callback(status, &rec, query->context); 1555 } else 1556 query->callback(status, NULL, query->context); 1557 } 1558 1559 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query) 1560 { 1561 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query)); 1562 } 1563 1564 int ib_sa_guid_info_rec_query(struct ib_sa_client *client, 1565 struct ib_device *device, u8 port_num, 1566 struct ib_sa_guidinfo_rec *rec, 1567 ib_sa_comp_mask comp_mask, u8 method, 1568 int timeout_ms, gfp_t gfp_mask, 1569 void (*callback)(int status, 1570 struct ib_sa_guidinfo_rec *resp, 1571 void *context), 1572 void *context, 1573 struct ib_sa_query **sa_query) 1574 { 1575 struct ib_sa_guidinfo_query *query; 1576 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1577 struct ib_sa_port *port; 1578 struct ib_mad_agent *agent; 1579 struct ib_sa_mad *mad; 1580 int ret; 1581 1582 if (!sa_dev) 1583 return -ENODEV; 1584 1585 if (method != IB_MGMT_METHOD_GET && 1586 method != IB_MGMT_METHOD_SET && 1587 method != IB_SA_METHOD_DELETE) { 1588 return -EINVAL; 1589 } 1590 1591 port = &sa_dev->port[port_num - sa_dev->start_port]; 1592 agent = port->agent; 1593 1594 query = kzalloc(sizeof(*query), gfp_mask); 1595 if (!query) 1596 return -ENOMEM; 1597 1598 query->sa_query.port = port; 1599 ret = alloc_mad(&query->sa_query, gfp_mask); 1600 if (ret) 1601 goto err1; 1602 1603 ib_sa_client_get(client); 1604 query->sa_query.client = client; 1605 query->callback = callback; 1606 query->context = context; 1607 1608 mad = query->sa_query.mad_buf->mad; 1609 init_mad(mad, agent); 1610 1611 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL; 1612 query->sa_query.release = ib_sa_guidinfo_rec_release; 1613 1614 mad->mad_hdr.method = method; 1615 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC); 1616 mad->sa_hdr.comp_mask = comp_mask; 1617 1618 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec, 1619 mad->data); 1620 1621 *sa_query = &query->sa_query; 1622 1623 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 1624 if (ret < 0) 1625 goto err2; 1626 1627 return ret; 1628 1629 err2: 1630 *sa_query = NULL; 1631 ib_sa_client_put(query->sa_query.client); 1632 free_mad(&query->sa_query); 1633 1634 err1: 1635 kfree(query); 1636 return ret; 1637 } 1638 EXPORT_SYMBOL(ib_sa_guid_info_rec_query); 1639 1640 static void send_handler(struct ib_mad_agent *agent, 1641 struct ib_mad_send_wc *mad_send_wc) 1642 { 1643 struct ib_sa_query *query = mad_send_wc->send_buf->context[0]; 1644 unsigned long flags; 1645 1646 if (query->callback) 1647 switch (mad_send_wc->status) { 1648 case IB_WC_SUCCESS: 1649 /* No callback -- already got recv */ 1650 break; 1651 case IB_WC_RESP_TIMEOUT_ERR: 1652 query->callback(query, -ETIMEDOUT, NULL); 1653 break; 1654 case IB_WC_WR_FLUSH_ERR: 1655 query->callback(query, -EINTR, NULL); 1656 break; 1657 default: 1658 query->callback(query, -EIO, NULL); 1659 break; 1660 } 1661 1662 spin_lock_irqsave(&idr_lock, flags); 1663 idr_remove(&query_idr, query->id); 1664 spin_unlock_irqrestore(&idr_lock, flags); 1665 1666 free_mad(query); 1667 ib_sa_client_put(query->client); 1668 query->release(query); 1669 } 1670 1671 static void recv_handler(struct ib_mad_agent *mad_agent, 1672 struct ib_mad_recv_wc *mad_recv_wc) 1673 { 1674 struct ib_sa_query *query; 1675 struct ib_mad_send_buf *mad_buf; 1676 1677 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id; 1678 query = mad_buf->context[0]; 1679 1680 if (query->callback) { 1681 if (mad_recv_wc->wc->status == IB_WC_SUCCESS) 1682 query->callback(query, 1683 mad_recv_wc->recv_buf.mad->mad_hdr.status ? 1684 -EINVAL : 0, 1685 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad); 1686 else 1687 query->callback(query, -EIO, NULL); 1688 } 1689 1690 ib_free_recv_mad(mad_recv_wc); 1691 } 1692 1693 static void ib_sa_add_one(struct ib_device *device) 1694 { 1695 struct ib_sa_device *sa_dev; 1696 int s, e, i; 1697 int count = 0; 1698 1699 s = rdma_start_port(device); 1700 e = rdma_end_port(device); 1701 1702 sa_dev = kzalloc(sizeof *sa_dev + 1703 (e - s + 1) * sizeof (struct ib_sa_port), 1704 GFP_KERNEL); 1705 if (!sa_dev) 1706 return; 1707 1708 sa_dev->start_port = s; 1709 sa_dev->end_port = e; 1710 1711 for (i = 0; i <= e - s; ++i) { 1712 spin_lock_init(&sa_dev->port[i].ah_lock); 1713 if (!rdma_cap_ib_sa(device, i + 1)) 1714 continue; 1715 1716 sa_dev->port[i].sm_ah = NULL; 1717 sa_dev->port[i].port_num = i + s; 1718 1719 sa_dev->port[i].agent = 1720 ib_register_mad_agent(device, i + s, IB_QPT_GSI, 1721 NULL, 0, send_handler, 1722 recv_handler, sa_dev, 0); 1723 if (IS_ERR(sa_dev->port[i].agent)) 1724 goto err; 1725 1726 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah); 1727 1728 count++; 1729 } 1730 1731 if (!count) 1732 goto free; 1733 1734 ib_set_client_data(device, &sa_client, sa_dev); 1735 1736 /* 1737 * We register our event handler after everything is set up, 1738 * and then update our cached info after the event handler is 1739 * registered to avoid any problems if a port changes state 1740 * during our initialization. 1741 */ 1742 1743 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event); 1744 if (ib_register_event_handler(&sa_dev->event_handler)) 1745 goto err; 1746 1747 for (i = 0; i <= e - s; ++i) { 1748 if (rdma_cap_ib_sa(device, i + 1)) 1749 update_sm_ah(&sa_dev->port[i].update_task); 1750 } 1751 1752 return; 1753 1754 err: 1755 while (--i >= 0) { 1756 if (rdma_cap_ib_sa(device, i + 1)) 1757 ib_unregister_mad_agent(sa_dev->port[i].agent); 1758 } 1759 free: 1760 kfree(sa_dev); 1761 return; 1762 } 1763 1764 static void ib_sa_remove_one(struct ib_device *device, void *client_data) 1765 { 1766 struct ib_sa_device *sa_dev = client_data; 1767 int i; 1768 1769 if (!sa_dev) 1770 return; 1771 1772 ib_unregister_event_handler(&sa_dev->event_handler); 1773 1774 flush_workqueue(ib_wq); 1775 1776 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) { 1777 if (rdma_cap_ib_sa(device, i + 1)) { 1778 ib_unregister_mad_agent(sa_dev->port[i].agent); 1779 if (sa_dev->port[i].sm_ah) 1780 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah); 1781 } 1782 1783 } 1784 1785 kfree(sa_dev); 1786 } 1787 1788 static int __init ib_sa_init(void) 1789 { 1790 int ret; 1791 1792 get_random_bytes(&tid, sizeof tid); 1793 1794 atomic_set(&ib_nl_sa_request_seq, 0); 1795 1796 ret = ib_register_client(&sa_client); 1797 if (ret) { 1798 printk(KERN_ERR "Couldn't register ib_sa client\n"); 1799 goto err1; 1800 } 1801 1802 ret = mcast_init(); 1803 if (ret) { 1804 printk(KERN_ERR "Couldn't initialize multicast handling\n"); 1805 goto err2; 1806 } 1807 1808 ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq"); 1809 if (!ib_nl_wq) { 1810 ret = -ENOMEM; 1811 goto err3; 1812 } 1813 1814 if (ibnl_add_client(RDMA_NL_LS, RDMA_NL_LS_NUM_OPS, 1815 ib_sa_cb_table)) { 1816 pr_err("Failed to add netlink callback\n"); 1817 ret = -EINVAL; 1818 goto err4; 1819 } 1820 INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout); 1821 1822 return 0; 1823 err4: 1824 destroy_workqueue(ib_nl_wq); 1825 err3: 1826 mcast_cleanup(); 1827 err2: 1828 ib_unregister_client(&sa_client); 1829 err1: 1830 return ret; 1831 } 1832 1833 static void __exit ib_sa_cleanup(void) 1834 { 1835 ibnl_remove_client(RDMA_NL_LS); 1836 cancel_delayed_work(&ib_nl_timed_work); 1837 flush_workqueue(ib_nl_wq); 1838 destroy_workqueue(ib_nl_wq); 1839 mcast_cleanup(); 1840 ib_unregister_client(&sa_client); 1841 idr_destroy(&query_idr); 1842 } 1843 1844 module_init(ib_sa_init); 1845 module_exit(ib_sa_cleanup); 1846