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 46 #include <rdma/ib_pack.h> 47 #include <rdma/ib_cache.h> 48 #include "sa.h" 49 50 MODULE_AUTHOR("Roland Dreier"); 51 MODULE_DESCRIPTION("InfiniBand subnet administration query support"); 52 MODULE_LICENSE("Dual BSD/GPL"); 53 54 struct ib_sa_sm_ah { 55 struct ib_ah *ah; 56 struct kref ref; 57 u16 pkey_index; 58 u8 src_path_mask; 59 }; 60 61 struct ib_sa_port { 62 struct ib_mad_agent *agent; 63 struct ib_sa_sm_ah *sm_ah; 64 struct work_struct update_task; 65 spinlock_t ah_lock; 66 u8 port_num; 67 }; 68 69 struct ib_sa_device { 70 int start_port, end_port; 71 struct ib_event_handler event_handler; 72 struct ib_sa_port port[0]; 73 }; 74 75 struct ib_sa_query { 76 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *); 77 void (*release)(struct ib_sa_query *); 78 struct ib_sa_client *client; 79 struct ib_sa_port *port; 80 struct ib_mad_send_buf *mad_buf; 81 struct ib_sa_sm_ah *sm_ah; 82 int id; 83 }; 84 85 struct ib_sa_service_query { 86 void (*callback)(int, struct ib_sa_service_rec *, void *); 87 void *context; 88 struct ib_sa_query sa_query; 89 }; 90 91 struct ib_sa_path_query { 92 void (*callback)(int, struct ib_sa_path_rec *, void *); 93 void *context; 94 struct ib_sa_query sa_query; 95 }; 96 97 struct ib_sa_guidinfo_query { 98 void (*callback)(int, struct ib_sa_guidinfo_rec *, void *); 99 void *context; 100 struct ib_sa_query sa_query; 101 }; 102 103 struct ib_sa_mcmember_query { 104 void (*callback)(int, struct ib_sa_mcmember_rec *, void *); 105 void *context; 106 struct ib_sa_query sa_query; 107 }; 108 109 static void ib_sa_add_one(struct ib_device *device); 110 static void ib_sa_remove_one(struct ib_device *device); 111 112 static struct ib_client sa_client = { 113 .name = "sa", 114 .add = ib_sa_add_one, 115 .remove = ib_sa_remove_one 116 }; 117 118 static DEFINE_SPINLOCK(idr_lock); 119 static DEFINE_IDR(query_idr); 120 121 static DEFINE_SPINLOCK(tid_lock); 122 static u32 tid; 123 124 #define PATH_REC_FIELD(field) \ 125 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \ 126 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \ 127 .field_name = "sa_path_rec:" #field 128 129 static const struct ib_field path_rec_table[] = { 130 { PATH_REC_FIELD(service_id), 131 .offset_words = 0, 132 .offset_bits = 0, 133 .size_bits = 64 }, 134 { PATH_REC_FIELD(dgid), 135 .offset_words = 2, 136 .offset_bits = 0, 137 .size_bits = 128 }, 138 { PATH_REC_FIELD(sgid), 139 .offset_words = 6, 140 .offset_bits = 0, 141 .size_bits = 128 }, 142 { PATH_REC_FIELD(dlid), 143 .offset_words = 10, 144 .offset_bits = 0, 145 .size_bits = 16 }, 146 { PATH_REC_FIELD(slid), 147 .offset_words = 10, 148 .offset_bits = 16, 149 .size_bits = 16 }, 150 { PATH_REC_FIELD(raw_traffic), 151 .offset_words = 11, 152 .offset_bits = 0, 153 .size_bits = 1 }, 154 { RESERVED, 155 .offset_words = 11, 156 .offset_bits = 1, 157 .size_bits = 3 }, 158 { PATH_REC_FIELD(flow_label), 159 .offset_words = 11, 160 .offset_bits = 4, 161 .size_bits = 20 }, 162 { PATH_REC_FIELD(hop_limit), 163 .offset_words = 11, 164 .offset_bits = 24, 165 .size_bits = 8 }, 166 { PATH_REC_FIELD(traffic_class), 167 .offset_words = 12, 168 .offset_bits = 0, 169 .size_bits = 8 }, 170 { PATH_REC_FIELD(reversible), 171 .offset_words = 12, 172 .offset_bits = 8, 173 .size_bits = 1 }, 174 { PATH_REC_FIELD(numb_path), 175 .offset_words = 12, 176 .offset_bits = 9, 177 .size_bits = 7 }, 178 { PATH_REC_FIELD(pkey), 179 .offset_words = 12, 180 .offset_bits = 16, 181 .size_bits = 16 }, 182 { PATH_REC_FIELD(qos_class), 183 .offset_words = 13, 184 .offset_bits = 0, 185 .size_bits = 12 }, 186 { PATH_REC_FIELD(sl), 187 .offset_words = 13, 188 .offset_bits = 12, 189 .size_bits = 4 }, 190 { PATH_REC_FIELD(mtu_selector), 191 .offset_words = 13, 192 .offset_bits = 16, 193 .size_bits = 2 }, 194 { PATH_REC_FIELD(mtu), 195 .offset_words = 13, 196 .offset_bits = 18, 197 .size_bits = 6 }, 198 { PATH_REC_FIELD(rate_selector), 199 .offset_words = 13, 200 .offset_bits = 24, 201 .size_bits = 2 }, 202 { PATH_REC_FIELD(rate), 203 .offset_words = 13, 204 .offset_bits = 26, 205 .size_bits = 6 }, 206 { PATH_REC_FIELD(packet_life_time_selector), 207 .offset_words = 14, 208 .offset_bits = 0, 209 .size_bits = 2 }, 210 { PATH_REC_FIELD(packet_life_time), 211 .offset_words = 14, 212 .offset_bits = 2, 213 .size_bits = 6 }, 214 { PATH_REC_FIELD(preference), 215 .offset_words = 14, 216 .offset_bits = 8, 217 .size_bits = 8 }, 218 { RESERVED, 219 .offset_words = 14, 220 .offset_bits = 16, 221 .size_bits = 48 }, 222 }; 223 224 #define MCMEMBER_REC_FIELD(field) \ 225 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \ 226 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \ 227 .field_name = "sa_mcmember_rec:" #field 228 229 static const struct ib_field mcmember_rec_table[] = { 230 { MCMEMBER_REC_FIELD(mgid), 231 .offset_words = 0, 232 .offset_bits = 0, 233 .size_bits = 128 }, 234 { MCMEMBER_REC_FIELD(port_gid), 235 .offset_words = 4, 236 .offset_bits = 0, 237 .size_bits = 128 }, 238 { MCMEMBER_REC_FIELD(qkey), 239 .offset_words = 8, 240 .offset_bits = 0, 241 .size_bits = 32 }, 242 { MCMEMBER_REC_FIELD(mlid), 243 .offset_words = 9, 244 .offset_bits = 0, 245 .size_bits = 16 }, 246 { MCMEMBER_REC_FIELD(mtu_selector), 247 .offset_words = 9, 248 .offset_bits = 16, 249 .size_bits = 2 }, 250 { MCMEMBER_REC_FIELD(mtu), 251 .offset_words = 9, 252 .offset_bits = 18, 253 .size_bits = 6 }, 254 { MCMEMBER_REC_FIELD(traffic_class), 255 .offset_words = 9, 256 .offset_bits = 24, 257 .size_bits = 8 }, 258 { MCMEMBER_REC_FIELD(pkey), 259 .offset_words = 10, 260 .offset_bits = 0, 261 .size_bits = 16 }, 262 { MCMEMBER_REC_FIELD(rate_selector), 263 .offset_words = 10, 264 .offset_bits = 16, 265 .size_bits = 2 }, 266 { MCMEMBER_REC_FIELD(rate), 267 .offset_words = 10, 268 .offset_bits = 18, 269 .size_bits = 6 }, 270 { MCMEMBER_REC_FIELD(packet_life_time_selector), 271 .offset_words = 10, 272 .offset_bits = 24, 273 .size_bits = 2 }, 274 { MCMEMBER_REC_FIELD(packet_life_time), 275 .offset_words = 10, 276 .offset_bits = 26, 277 .size_bits = 6 }, 278 { MCMEMBER_REC_FIELD(sl), 279 .offset_words = 11, 280 .offset_bits = 0, 281 .size_bits = 4 }, 282 { MCMEMBER_REC_FIELD(flow_label), 283 .offset_words = 11, 284 .offset_bits = 4, 285 .size_bits = 20 }, 286 { MCMEMBER_REC_FIELD(hop_limit), 287 .offset_words = 11, 288 .offset_bits = 24, 289 .size_bits = 8 }, 290 { MCMEMBER_REC_FIELD(scope), 291 .offset_words = 12, 292 .offset_bits = 0, 293 .size_bits = 4 }, 294 { MCMEMBER_REC_FIELD(join_state), 295 .offset_words = 12, 296 .offset_bits = 4, 297 .size_bits = 4 }, 298 { MCMEMBER_REC_FIELD(proxy_join), 299 .offset_words = 12, 300 .offset_bits = 8, 301 .size_bits = 1 }, 302 { RESERVED, 303 .offset_words = 12, 304 .offset_bits = 9, 305 .size_bits = 23 }, 306 }; 307 308 #define SERVICE_REC_FIELD(field) \ 309 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \ 310 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \ 311 .field_name = "sa_service_rec:" #field 312 313 static const struct ib_field service_rec_table[] = { 314 { SERVICE_REC_FIELD(id), 315 .offset_words = 0, 316 .offset_bits = 0, 317 .size_bits = 64 }, 318 { SERVICE_REC_FIELD(gid), 319 .offset_words = 2, 320 .offset_bits = 0, 321 .size_bits = 128 }, 322 { SERVICE_REC_FIELD(pkey), 323 .offset_words = 6, 324 .offset_bits = 0, 325 .size_bits = 16 }, 326 { SERVICE_REC_FIELD(lease), 327 .offset_words = 7, 328 .offset_bits = 0, 329 .size_bits = 32 }, 330 { SERVICE_REC_FIELD(key), 331 .offset_words = 8, 332 .offset_bits = 0, 333 .size_bits = 128 }, 334 { SERVICE_REC_FIELD(name), 335 .offset_words = 12, 336 .offset_bits = 0, 337 .size_bits = 64*8 }, 338 { SERVICE_REC_FIELD(data8), 339 .offset_words = 28, 340 .offset_bits = 0, 341 .size_bits = 16*8 }, 342 { SERVICE_REC_FIELD(data16), 343 .offset_words = 32, 344 .offset_bits = 0, 345 .size_bits = 8*16 }, 346 { SERVICE_REC_FIELD(data32), 347 .offset_words = 36, 348 .offset_bits = 0, 349 .size_bits = 4*32 }, 350 { SERVICE_REC_FIELD(data64), 351 .offset_words = 40, 352 .offset_bits = 0, 353 .size_bits = 2*64 }, 354 }; 355 356 #define GUIDINFO_REC_FIELD(field) \ 357 .struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field), \ 358 .struct_size_bytes = sizeof((struct ib_sa_guidinfo_rec *) 0)->field, \ 359 .field_name = "sa_guidinfo_rec:" #field 360 361 static const struct ib_field guidinfo_rec_table[] = { 362 { GUIDINFO_REC_FIELD(lid), 363 .offset_words = 0, 364 .offset_bits = 0, 365 .size_bits = 16 }, 366 { GUIDINFO_REC_FIELD(block_num), 367 .offset_words = 0, 368 .offset_bits = 16, 369 .size_bits = 8 }, 370 { GUIDINFO_REC_FIELD(res1), 371 .offset_words = 0, 372 .offset_bits = 24, 373 .size_bits = 8 }, 374 { GUIDINFO_REC_FIELD(res2), 375 .offset_words = 1, 376 .offset_bits = 0, 377 .size_bits = 32 }, 378 { GUIDINFO_REC_FIELD(guid_info_list), 379 .offset_words = 2, 380 .offset_bits = 0, 381 .size_bits = 512 }, 382 }; 383 384 static void free_sm_ah(struct kref *kref) 385 { 386 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref); 387 388 ib_destroy_ah(sm_ah->ah); 389 kfree(sm_ah); 390 } 391 392 static void update_sm_ah(struct work_struct *work) 393 { 394 struct ib_sa_port *port = 395 container_of(work, struct ib_sa_port, update_task); 396 struct ib_sa_sm_ah *new_ah; 397 struct ib_port_attr port_attr; 398 struct ib_ah_attr ah_attr; 399 400 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) { 401 printk(KERN_WARNING "Couldn't query port\n"); 402 return; 403 } 404 405 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL); 406 if (!new_ah) { 407 printk(KERN_WARNING "Couldn't allocate new SM AH\n"); 408 return; 409 } 410 411 kref_init(&new_ah->ref); 412 new_ah->src_path_mask = (1 << port_attr.lmc) - 1; 413 414 new_ah->pkey_index = 0; 415 if (ib_find_pkey(port->agent->device, port->port_num, 416 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index)) 417 printk(KERN_ERR "Couldn't find index for default PKey\n"); 418 419 memset(&ah_attr, 0, sizeof ah_attr); 420 ah_attr.dlid = port_attr.sm_lid; 421 ah_attr.sl = port_attr.sm_sl; 422 ah_attr.port_num = port->port_num; 423 424 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr); 425 if (IS_ERR(new_ah->ah)) { 426 printk(KERN_WARNING "Couldn't create new SM AH\n"); 427 kfree(new_ah); 428 return; 429 } 430 431 spin_lock_irq(&port->ah_lock); 432 if (port->sm_ah) 433 kref_put(&port->sm_ah->ref, free_sm_ah); 434 port->sm_ah = new_ah; 435 spin_unlock_irq(&port->ah_lock); 436 437 } 438 439 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event) 440 { 441 if (event->event == IB_EVENT_PORT_ERR || 442 event->event == IB_EVENT_PORT_ACTIVE || 443 event->event == IB_EVENT_LID_CHANGE || 444 event->event == IB_EVENT_PKEY_CHANGE || 445 event->event == IB_EVENT_SM_CHANGE || 446 event->event == IB_EVENT_CLIENT_REREGISTER) { 447 unsigned long flags; 448 struct ib_sa_device *sa_dev = 449 container_of(handler, typeof(*sa_dev), event_handler); 450 struct ib_sa_port *port = 451 &sa_dev->port[event->element.port_num - sa_dev->start_port]; 452 453 if (rdma_port_get_link_layer(handler->device, port->port_num) != IB_LINK_LAYER_INFINIBAND) 454 return; 455 456 spin_lock_irqsave(&port->ah_lock, flags); 457 if (port->sm_ah) 458 kref_put(&port->sm_ah->ref, free_sm_ah); 459 port->sm_ah = NULL; 460 spin_unlock_irqrestore(&port->ah_lock, flags); 461 462 queue_work(ib_wq, &sa_dev->port[event->element.port_num - 463 sa_dev->start_port].update_task); 464 } 465 } 466 467 void ib_sa_register_client(struct ib_sa_client *client) 468 { 469 atomic_set(&client->users, 1); 470 init_completion(&client->comp); 471 } 472 EXPORT_SYMBOL(ib_sa_register_client); 473 474 void ib_sa_unregister_client(struct ib_sa_client *client) 475 { 476 ib_sa_client_put(client); 477 wait_for_completion(&client->comp); 478 } 479 EXPORT_SYMBOL(ib_sa_unregister_client); 480 481 /** 482 * ib_sa_cancel_query - try to cancel an SA query 483 * @id:ID of query to cancel 484 * @query:query pointer to cancel 485 * 486 * Try to cancel an SA query. If the id and query don't match up or 487 * the query has already completed, nothing is done. Otherwise the 488 * query is canceled and will complete with a status of -EINTR. 489 */ 490 void ib_sa_cancel_query(int id, struct ib_sa_query *query) 491 { 492 unsigned long flags; 493 struct ib_mad_agent *agent; 494 struct ib_mad_send_buf *mad_buf; 495 496 spin_lock_irqsave(&idr_lock, flags); 497 if (idr_find(&query_idr, id) != query) { 498 spin_unlock_irqrestore(&idr_lock, flags); 499 return; 500 } 501 agent = query->port->agent; 502 mad_buf = query->mad_buf; 503 spin_unlock_irqrestore(&idr_lock, flags); 504 505 ib_cancel_mad(agent, mad_buf); 506 } 507 EXPORT_SYMBOL(ib_sa_cancel_query); 508 509 static u8 get_src_path_mask(struct ib_device *device, u8 port_num) 510 { 511 struct ib_sa_device *sa_dev; 512 struct ib_sa_port *port; 513 unsigned long flags; 514 u8 src_path_mask; 515 516 sa_dev = ib_get_client_data(device, &sa_client); 517 if (!sa_dev) 518 return 0x7f; 519 520 port = &sa_dev->port[port_num - sa_dev->start_port]; 521 spin_lock_irqsave(&port->ah_lock, flags); 522 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f; 523 spin_unlock_irqrestore(&port->ah_lock, flags); 524 525 return src_path_mask; 526 } 527 528 int ib_init_ah_from_path(struct ib_device *device, u8 port_num, 529 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr) 530 { 531 int ret; 532 u16 gid_index; 533 int force_grh; 534 535 memset(ah_attr, 0, sizeof *ah_attr); 536 ah_attr->dlid = be16_to_cpu(rec->dlid); 537 ah_attr->sl = rec->sl; 538 ah_attr->src_path_bits = be16_to_cpu(rec->slid) & 539 get_src_path_mask(device, port_num); 540 ah_attr->port_num = port_num; 541 ah_attr->static_rate = rec->rate; 542 543 force_grh = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_ETHERNET; 544 545 if (rec->hop_limit > 1 || force_grh) { 546 ah_attr->ah_flags = IB_AH_GRH; 547 ah_attr->grh.dgid = rec->dgid; 548 549 ret = ib_find_cached_gid(device, &rec->sgid, &port_num, 550 &gid_index); 551 if (ret) 552 return ret; 553 554 ah_attr->grh.sgid_index = gid_index; 555 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label); 556 ah_attr->grh.hop_limit = rec->hop_limit; 557 ah_attr->grh.traffic_class = rec->traffic_class; 558 } 559 return 0; 560 } 561 EXPORT_SYMBOL(ib_init_ah_from_path); 562 563 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask) 564 { 565 unsigned long flags; 566 567 spin_lock_irqsave(&query->port->ah_lock, flags); 568 if (!query->port->sm_ah) { 569 spin_unlock_irqrestore(&query->port->ah_lock, flags); 570 return -EAGAIN; 571 } 572 kref_get(&query->port->sm_ah->ref); 573 query->sm_ah = query->port->sm_ah; 574 spin_unlock_irqrestore(&query->port->ah_lock, flags); 575 576 query->mad_buf = ib_create_send_mad(query->port->agent, 1, 577 query->sm_ah->pkey_index, 578 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA, 579 gfp_mask); 580 if (IS_ERR(query->mad_buf)) { 581 kref_put(&query->sm_ah->ref, free_sm_ah); 582 return -ENOMEM; 583 } 584 585 query->mad_buf->ah = query->sm_ah->ah; 586 587 return 0; 588 } 589 590 static void free_mad(struct ib_sa_query *query) 591 { 592 ib_free_send_mad(query->mad_buf); 593 kref_put(&query->sm_ah->ref, free_sm_ah); 594 } 595 596 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent) 597 { 598 unsigned long flags; 599 600 memset(mad, 0, sizeof *mad); 601 602 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION; 603 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 604 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION; 605 606 spin_lock_irqsave(&tid_lock, flags); 607 mad->mad_hdr.tid = 608 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++); 609 spin_unlock_irqrestore(&tid_lock, flags); 610 } 611 612 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask) 613 { 614 unsigned long flags; 615 int ret, id; 616 617 retry: 618 if (!idr_pre_get(&query_idr, gfp_mask)) 619 return -ENOMEM; 620 spin_lock_irqsave(&idr_lock, flags); 621 ret = idr_get_new(&query_idr, query, &id); 622 spin_unlock_irqrestore(&idr_lock, flags); 623 if (ret == -EAGAIN) 624 goto retry; 625 if (ret) 626 return ret; 627 628 query->mad_buf->timeout_ms = timeout_ms; 629 query->mad_buf->context[0] = query; 630 query->id = id; 631 632 ret = ib_post_send_mad(query->mad_buf, NULL); 633 if (ret) { 634 spin_lock_irqsave(&idr_lock, flags); 635 idr_remove(&query_idr, id); 636 spin_unlock_irqrestore(&idr_lock, flags); 637 } 638 639 /* 640 * It's not safe to dereference query any more, because the 641 * send may already have completed and freed the query in 642 * another context. 643 */ 644 return ret ? ret : id; 645 } 646 647 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec) 648 { 649 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec); 650 } 651 EXPORT_SYMBOL(ib_sa_unpack_path); 652 653 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query, 654 int status, 655 struct ib_sa_mad *mad) 656 { 657 struct ib_sa_path_query *query = 658 container_of(sa_query, struct ib_sa_path_query, sa_query); 659 660 if (mad) { 661 struct ib_sa_path_rec rec; 662 663 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), 664 mad->data, &rec); 665 query->callback(status, &rec, query->context); 666 } else 667 query->callback(status, NULL, query->context); 668 } 669 670 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query) 671 { 672 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query)); 673 } 674 675 /** 676 * ib_sa_path_rec_get - Start a Path get query 677 * @client:SA client 678 * @device:device to send query on 679 * @port_num: port number to send query on 680 * @rec:Path Record to send in query 681 * @comp_mask:component mask to send in query 682 * @timeout_ms:time to wait for response 683 * @gfp_mask:GFP mask to use for internal allocations 684 * @callback:function called when query completes, times out or is 685 * canceled 686 * @context:opaque user context passed to callback 687 * @sa_query:query context, used to cancel query 688 * 689 * Send a Path Record Get query to the SA to look up a path. The 690 * callback function will be called when the query completes (or 691 * fails); status is 0 for a successful response, -EINTR if the query 692 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 693 * occurred sending the query. The resp parameter of the callback is 694 * only valid if status is 0. 695 * 696 * If the return value of ib_sa_path_rec_get() is negative, it is an 697 * error code. Otherwise it is a query ID that can be used to cancel 698 * the query. 699 */ 700 int ib_sa_path_rec_get(struct ib_sa_client *client, 701 struct ib_device *device, u8 port_num, 702 struct ib_sa_path_rec *rec, 703 ib_sa_comp_mask comp_mask, 704 int timeout_ms, gfp_t gfp_mask, 705 void (*callback)(int status, 706 struct ib_sa_path_rec *resp, 707 void *context), 708 void *context, 709 struct ib_sa_query **sa_query) 710 { 711 struct ib_sa_path_query *query; 712 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 713 struct ib_sa_port *port; 714 struct ib_mad_agent *agent; 715 struct ib_sa_mad *mad; 716 int ret; 717 718 if (!sa_dev) 719 return -ENODEV; 720 721 port = &sa_dev->port[port_num - sa_dev->start_port]; 722 agent = port->agent; 723 724 query = kmalloc(sizeof *query, gfp_mask); 725 if (!query) 726 return -ENOMEM; 727 728 query->sa_query.port = port; 729 ret = alloc_mad(&query->sa_query, gfp_mask); 730 if (ret) 731 goto err1; 732 733 ib_sa_client_get(client); 734 query->sa_query.client = client; 735 query->callback = callback; 736 query->context = context; 737 738 mad = query->sa_query.mad_buf->mad; 739 init_mad(mad, agent); 740 741 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL; 742 query->sa_query.release = ib_sa_path_rec_release; 743 mad->mad_hdr.method = IB_MGMT_METHOD_GET; 744 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC); 745 mad->sa_hdr.comp_mask = comp_mask; 746 747 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data); 748 749 *sa_query = &query->sa_query; 750 751 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 752 if (ret < 0) 753 goto err2; 754 755 return ret; 756 757 err2: 758 *sa_query = NULL; 759 ib_sa_client_put(query->sa_query.client); 760 free_mad(&query->sa_query); 761 762 err1: 763 kfree(query); 764 return ret; 765 } 766 EXPORT_SYMBOL(ib_sa_path_rec_get); 767 768 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query, 769 int status, 770 struct ib_sa_mad *mad) 771 { 772 struct ib_sa_service_query *query = 773 container_of(sa_query, struct ib_sa_service_query, sa_query); 774 775 if (mad) { 776 struct ib_sa_service_rec rec; 777 778 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table), 779 mad->data, &rec); 780 query->callback(status, &rec, query->context); 781 } else 782 query->callback(status, NULL, query->context); 783 } 784 785 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query) 786 { 787 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query)); 788 } 789 790 /** 791 * ib_sa_service_rec_query - Start Service Record operation 792 * @client:SA client 793 * @device:device to send request on 794 * @port_num: port number to send request on 795 * @method:SA method - should be get, set, or delete 796 * @rec:Service Record to send in request 797 * @comp_mask:component mask to send in request 798 * @timeout_ms:time to wait for response 799 * @gfp_mask:GFP mask to use for internal allocations 800 * @callback:function called when request completes, times out or is 801 * canceled 802 * @context:opaque user context passed to callback 803 * @sa_query:request context, used to cancel request 804 * 805 * Send a Service Record set/get/delete to the SA to register, 806 * unregister or query a service record. 807 * The callback function will be called when the request completes (or 808 * fails); status is 0 for a successful response, -EINTR if the query 809 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 810 * occurred sending the query. The resp parameter of the callback is 811 * only valid if status is 0. 812 * 813 * If the return value of ib_sa_service_rec_query() is negative, it is an 814 * error code. Otherwise it is a request ID that can be used to cancel 815 * the query. 816 */ 817 int ib_sa_service_rec_query(struct ib_sa_client *client, 818 struct ib_device *device, u8 port_num, u8 method, 819 struct ib_sa_service_rec *rec, 820 ib_sa_comp_mask comp_mask, 821 int timeout_ms, gfp_t gfp_mask, 822 void (*callback)(int status, 823 struct ib_sa_service_rec *resp, 824 void *context), 825 void *context, 826 struct ib_sa_query **sa_query) 827 { 828 struct ib_sa_service_query *query; 829 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 830 struct ib_sa_port *port; 831 struct ib_mad_agent *agent; 832 struct ib_sa_mad *mad; 833 int ret; 834 835 if (!sa_dev) 836 return -ENODEV; 837 838 port = &sa_dev->port[port_num - sa_dev->start_port]; 839 agent = port->agent; 840 841 if (method != IB_MGMT_METHOD_GET && 842 method != IB_MGMT_METHOD_SET && 843 method != IB_SA_METHOD_DELETE) 844 return -EINVAL; 845 846 query = kmalloc(sizeof *query, gfp_mask); 847 if (!query) 848 return -ENOMEM; 849 850 query->sa_query.port = port; 851 ret = alloc_mad(&query->sa_query, gfp_mask); 852 if (ret) 853 goto err1; 854 855 ib_sa_client_get(client); 856 query->sa_query.client = client; 857 query->callback = callback; 858 query->context = context; 859 860 mad = query->sa_query.mad_buf->mad; 861 init_mad(mad, agent); 862 863 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL; 864 query->sa_query.release = ib_sa_service_rec_release; 865 mad->mad_hdr.method = method; 866 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC); 867 mad->sa_hdr.comp_mask = comp_mask; 868 869 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table), 870 rec, mad->data); 871 872 *sa_query = &query->sa_query; 873 874 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 875 if (ret < 0) 876 goto err2; 877 878 return ret; 879 880 err2: 881 *sa_query = NULL; 882 ib_sa_client_put(query->sa_query.client); 883 free_mad(&query->sa_query); 884 885 err1: 886 kfree(query); 887 return ret; 888 } 889 EXPORT_SYMBOL(ib_sa_service_rec_query); 890 891 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query, 892 int status, 893 struct ib_sa_mad *mad) 894 { 895 struct ib_sa_mcmember_query *query = 896 container_of(sa_query, struct ib_sa_mcmember_query, sa_query); 897 898 if (mad) { 899 struct ib_sa_mcmember_rec rec; 900 901 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 902 mad->data, &rec); 903 query->callback(status, &rec, query->context); 904 } else 905 query->callback(status, NULL, query->context); 906 } 907 908 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query) 909 { 910 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query)); 911 } 912 913 int ib_sa_mcmember_rec_query(struct ib_sa_client *client, 914 struct ib_device *device, u8 port_num, 915 u8 method, 916 struct ib_sa_mcmember_rec *rec, 917 ib_sa_comp_mask comp_mask, 918 int timeout_ms, gfp_t gfp_mask, 919 void (*callback)(int status, 920 struct ib_sa_mcmember_rec *resp, 921 void *context), 922 void *context, 923 struct ib_sa_query **sa_query) 924 { 925 struct ib_sa_mcmember_query *query; 926 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 927 struct ib_sa_port *port; 928 struct ib_mad_agent *agent; 929 struct ib_sa_mad *mad; 930 int ret; 931 932 if (!sa_dev) 933 return -ENODEV; 934 935 port = &sa_dev->port[port_num - sa_dev->start_port]; 936 agent = port->agent; 937 938 query = kmalloc(sizeof *query, gfp_mask); 939 if (!query) 940 return -ENOMEM; 941 942 query->sa_query.port = port; 943 ret = alloc_mad(&query->sa_query, gfp_mask); 944 if (ret) 945 goto err1; 946 947 ib_sa_client_get(client); 948 query->sa_query.client = client; 949 query->callback = callback; 950 query->context = context; 951 952 mad = query->sa_query.mad_buf->mad; 953 init_mad(mad, agent); 954 955 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL; 956 query->sa_query.release = ib_sa_mcmember_rec_release; 957 mad->mad_hdr.method = method; 958 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 959 mad->sa_hdr.comp_mask = comp_mask; 960 961 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 962 rec, mad->data); 963 964 *sa_query = &query->sa_query; 965 966 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 967 if (ret < 0) 968 goto err2; 969 970 return ret; 971 972 err2: 973 *sa_query = NULL; 974 ib_sa_client_put(query->sa_query.client); 975 free_mad(&query->sa_query); 976 977 err1: 978 kfree(query); 979 return ret; 980 } 981 982 /* Support GuidInfoRecord */ 983 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query, 984 int status, 985 struct ib_sa_mad *mad) 986 { 987 struct ib_sa_guidinfo_query *query = 988 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query); 989 990 if (mad) { 991 struct ib_sa_guidinfo_rec rec; 992 993 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), 994 mad->data, &rec); 995 query->callback(status, &rec, query->context); 996 } else 997 query->callback(status, NULL, query->context); 998 } 999 1000 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query) 1001 { 1002 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query)); 1003 } 1004 1005 int ib_sa_guid_info_rec_query(struct ib_sa_client *client, 1006 struct ib_device *device, u8 port_num, 1007 struct ib_sa_guidinfo_rec *rec, 1008 ib_sa_comp_mask comp_mask, u8 method, 1009 int timeout_ms, gfp_t gfp_mask, 1010 void (*callback)(int status, 1011 struct ib_sa_guidinfo_rec *resp, 1012 void *context), 1013 void *context, 1014 struct ib_sa_query **sa_query) 1015 { 1016 struct ib_sa_guidinfo_query *query; 1017 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1018 struct ib_sa_port *port; 1019 struct ib_mad_agent *agent; 1020 struct ib_sa_mad *mad; 1021 int ret; 1022 1023 if (!sa_dev) 1024 return -ENODEV; 1025 1026 if (method != IB_MGMT_METHOD_GET && 1027 method != IB_MGMT_METHOD_SET && 1028 method != IB_SA_METHOD_DELETE) { 1029 return -EINVAL; 1030 } 1031 1032 port = &sa_dev->port[port_num - sa_dev->start_port]; 1033 agent = port->agent; 1034 1035 query = kmalloc(sizeof *query, gfp_mask); 1036 if (!query) 1037 return -ENOMEM; 1038 1039 query->sa_query.port = port; 1040 ret = alloc_mad(&query->sa_query, gfp_mask); 1041 if (ret) 1042 goto err1; 1043 1044 ib_sa_client_get(client); 1045 query->sa_query.client = client; 1046 query->callback = callback; 1047 query->context = context; 1048 1049 mad = query->sa_query.mad_buf->mad; 1050 init_mad(mad, agent); 1051 1052 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL; 1053 query->sa_query.release = ib_sa_guidinfo_rec_release; 1054 1055 mad->mad_hdr.method = method; 1056 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC); 1057 mad->sa_hdr.comp_mask = comp_mask; 1058 1059 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec, 1060 mad->data); 1061 1062 *sa_query = &query->sa_query; 1063 1064 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 1065 if (ret < 0) 1066 goto err2; 1067 1068 return ret; 1069 1070 err2: 1071 *sa_query = NULL; 1072 ib_sa_client_put(query->sa_query.client); 1073 free_mad(&query->sa_query); 1074 1075 err1: 1076 kfree(query); 1077 return ret; 1078 } 1079 EXPORT_SYMBOL(ib_sa_guid_info_rec_query); 1080 1081 static void send_handler(struct ib_mad_agent *agent, 1082 struct ib_mad_send_wc *mad_send_wc) 1083 { 1084 struct ib_sa_query *query = mad_send_wc->send_buf->context[0]; 1085 unsigned long flags; 1086 1087 if (query->callback) 1088 switch (mad_send_wc->status) { 1089 case IB_WC_SUCCESS: 1090 /* No callback -- already got recv */ 1091 break; 1092 case IB_WC_RESP_TIMEOUT_ERR: 1093 query->callback(query, -ETIMEDOUT, NULL); 1094 break; 1095 case IB_WC_WR_FLUSH_ERR: 1096 query->callback(query, -EINTR, NULL); 1097 break; 1098 default: 1099 query->callback(query, -EIO, NULL); 1100 break; 1101 } 1102 1103 spin_lock_irqsave(&idr_lock, flags); 1104 idr_remove(&query_idr, query->id); 1105 spin_unlock_irqrestore(&idr_lock, flags); 1106 1107 free_mad(query); 1108 ib_sa_client_put(query->client); 1109 query->release(query); 1110 } 1111 1112 static void recv_handler(struct ib_mad_agent *mad_agent, 1113 struct ib_mad_recv_wc *mad_recv_wc) 1114 { 1115 struct ib_sa_query *query; 1116 struct ib_mad_send_buf *mad_buf; 1117 1118 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id; 1119 query = mad_buf->context[0]; 1120 1121 if (query->callback) { 1122 if (mad_recv_wc->wc->status == IB_WC_SUCCESS) 1123 query->callback(query, 1124 mad_recv_wc->recv_buf.mad->mad_hdr.status ? 1125 -EINVAL : 0, 1126 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad); 1127 else 1128 query->callback(query, -EIO, NULL); 1129 } 1130 1131 ib_free_recv_mad(mad_recv_wc); 1132 } 1133 1134 static void ib_sa_add_one(struct ib_device *device) 1135 { 1136 struct ib_sa_device *sa_dev; 1137 int s, e, i; 1138 1139 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 1140 return; 1141 1142 if (device->node_type == RDMA_NODE_IB_SWITCH) 1143 s = e = 0; 1144 else { 1145 s = 1; 1146 e = device->phys_port_cnt; 1147 } 1148 1149 sa_dev = kzalloc(sizeof *sa_dev + 1150 (e - s + 1) * sizeof (struct ib_sa_port), 1151 GFP_KERNEL); 1152 if (!sa_dev) 1153 return; 1154 1155 sa_dev->start_port = s; 1156 sa_dev->end_port = e; 1157 1158 for (i = 0; i <= e - s; ++i) { 1159 spin_lock_init(&sa_dev->port[i].ah_lock); 1160 if (rdma_port_get_link_layer(device, i + 1) != IB_LINK_LAYER_INFINIBAND) 1161 continue; 1162 1163 sa_dev->port[i].sm_ah = NULL; 1164 sa_dev->port[i].port_num = i + s; 1165 1166 sa_dev->port[i].agent = 1167 ib_register_mad_agent(device, i + s, IB_QPT_GSI, 1168 NULL, 0, send_handler, 1169 recv_handler, sa_dev); 1170 if (IS_ERR(sa_dev->port[i].agent)) 1171 goto err; 1172 1173 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah); 1174 } 1175 1176 ib_set_client_data(device, &sa_client, sa_dev); 1177 1178 /* 1179 * We register our event handler after everything is set up, 1180 * and then update our cached info after the event handler is 1181 * registered to avoid any problems if a port changes state 1182 * during our initialization. 1183 */ 1184 1185 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event); 1186 if (ib_register_event_handler(&sa_dev->event_handler)) 1187 goto err; 1188 1189 for (i = 0; i <= e - s; ++i) 1190 if (rdma_port_get_link_layer(device, i + 1) == IB_LINK_LAYER_INFINIBAND) 1191 update_sm_ah(&sa_dev->port[i].update_task); 1192 1193 return; 1194 1195 err: 1196 while (--i >= 0) 1197 if (rdma_port_get_link_layer(device, i + 1) == IB_LINK_LAYER_INFINIBAND) 1198 ib_unregister_mad_agent(sa_dev->port[i].agent); 1199 1200 kfree(sa_dev); 1201 1202 return; 1203 } 1204 1205 static void ib_sa_remove_one(struct ib_device *device) 1206 { 1207 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1208 int i; 1209 1210 if (!sa_dev) 1211 return; 1212 1213 ib_unregister_event_handler(&sa_dev->event_handler); 1214 1215 flush_workqueue(ib_wq); 1216 1217 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) { 1218 if (rdma_port_get_link_layer(device, i + 1) == IB_LINK_LAYER_INFINIBAND) { 1219 ib_unregister_mad_agent(sa_dev->port[i].agent); 1220 if (sa_dev->port[i].sm_ah) 1221 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah); 1222 } 1223 1224 } 1225 1226 kfree(sa_dev); 1227 } 1228 1229 static int __init ib_sa_init(void) 1230 { 1231 int ret; 1232 1233 get_random_bytes(&tid, sizeof tid); 1234 1235 ret = ib_register_client(&sa_client); 1236 if (ret) { 1237 printk(KERN_ERR "Couldn't register ib_sa client\n"); 1238 goto err1; 1239 } 1240 1241 ret = mcast_init(); 1242 if (ret) { 1243 printk(KERN_ERR "Couldn't initialize multicast handling\n"); 1244 goto err2; 1245 } 1246 1247 return 0; 1248 err2: 1249 ib_unregister_client(&sa_client); 1250 err1: 1251 return ret; 1252 } 1253 1254 static void __exit ib_sa_cleanup(void) 1255 { 1256 mcast_cleanup(); 1257 ib_unregister_client(&sa_client); 1258 idr_destroy(&query_idr); 1259 } 1260 1261 module_init(ib_sa_init); 1262 module_exit(ib_sa_cleanup); 1263