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 "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_cap_ib_sa(handler->device, port->port_num)) 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_cap_eth_ah(device, port_num); 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 if (force_grh) { 560 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN); 561 ah_attr->vlan_id = rec->vlan_id; 562 } else { 563 ah_attr->vlan_id = 0xffff; 564 } 565 566 return 0; 567 } 568 EXPORT_SYMBOL(ib_init_ah_from_path); 569 570 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask) 571 { 572 unsigned long flags; 573 574 spin_lock_irqsave(&query->port->ah_lock, flags); 575 if (!query->port->sm_ah) { 576 spin_unlock_irqrestore(&query->port->ah_lock, flags); 577 return -EAGAIN; 578 } 579 kref_get(&query->port->sm_ah->ref); 580 query->sm_ah = query->port->sm_ah; 581 spin_unlock_irqrestore(&query->port->ah_lock, flags); 582 583 query->mad_buf = ib_create_send_mad(query->port->agent, 1, 584 query->sm_ah->pkey_index, 585 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA, 586 gfp_mask, 587 IB_MGMT_BASE_VERSION); 588 if (IS_ERR(query->mad_buf)) { 589 kref_put(&query->sm_ah->ref, free_sm_ah); 590 return -ENOMEM; 591 } 592 593 query->mad_buf->ah = query->sm_ah->ah; 594 595 return 0; 596 } 597 598 static void free_mad(struct ib_sa_query *query) 599 { 600 ib_free_send_mad(query->mad_buf); 601 kref_put(&query->sm_ah->ref, free_sm_ah); 602 } 603 604 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent) 605 { 606 unsigned long flags; 607 608 memset(mad, 0, sizeof *mad); 609 610 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION; 611 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM; 612 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION; 613 614 spin_lock_irqsave(&tid_lock, flags); 615 mad->mad_hdr.tid = 616 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++); 617 spin_unlock_irqrestore(&tid_lock, flags); 618 } 619 620 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask) 621 { 622 bool preload = !!(gfp_mask & __GFP_WAIT); 623 unsigned long flags; 624 int ret, id; 625 626 if (preload) 627 idr_preload(gfp_mask); 628 spin_lock_irqsave(&idr_lock, flags); 629 630 id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT); 631 632 spin_unlock_irqrestore(&idr_lock, flags); 633 if (preload) 634 idr_preload_end(); 635 if (id < 0) 636 return id; 637 638 query->mad_buf->timeout_ms = timeout_ms; 639 query->mad_buf->context[0] = query; 640 query->id = id; 641 642 ret = ib_post_send_mad(query->mad_buf, NULL); 643 if (ret) { 644 spin_lock_irqsave(&idr_lock, flags); 645 idr_remove(&query_idr, id); 646 spin_unlock_irqrestore(&idr_lock, flags); 647 } 648 649 /* 650 * It's not safe to dereference query any more, because the 651 * send may already have completed and freed the query in 652 * another context. 653 */ 654 return ret ? ret : id; 655 } 656 657 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec) 658 { 659 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec); 660 } 661 EXPORT_SYMBOL(ib_sa_unpack_path); 662 663 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute) 664 { 665 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute); 666 } 667 EXPORT_SYMBOL(ib_sa_pack_path); 668 669 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query, 670 int status, 671 struct ib_sa_mad *mad) 672 { 673 struct ib_sa_path_query *query = 674 container_of(sa_query, struct ib_sa_path_query, sa_query); 675 676 if (mad) { 677 struct ib_sa_path_rec rec; 678 679 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), 680 mad->data, &rec); 681 rec.vlan_id = 0xffff; 682 memset(rec.dmac, 0, ETH_ALEN); 683 memset(rec.smac, 0, ETH_ALEN); 684 query->callback(status, &rec, query->context); 685 } else 686 query->callback(status, NULL, query->context); 687 } 688 689 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query) 690 { 691 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query)); 692 } 693 694 /** 695 * ib_sa_path_rec_get - Start a Path get query 696 * @client:SA client 697 * @device:device to send query on 698 * @port_num: port number to send query on 699 * @rec:Path Record to send in query 700 * @comp_mask:component mask to send in query 701 * @timeout_ms:time to wait for response 702 * @gfp_mask:GFP mask to use for internal allocations 703 * @callback:function called when query completes, times out or is 704 * canceled 705 * @context:opaque user context passed to callback 706 * @sa_query:query context, used to cancel query 707 * 708 * Send a Path Record Get query to the SA to look up a path. The 709 * callback function will be called when the query completes (or 710 * fails); status is 0 for a successful response, -EINTR if the query 711 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 712 * occurred sending the query. The resp parameter of the callback is 713 * only valid if status is 0. 714 * 715 * If the return value of ib_sa_path_rec_get() is negative, it is an 716 * error code. Otherwise it is a query ID that can be used to cancel 717 * the query. 718 */ 719 int ib_sa_path_rec_get(struct ib_sa_client *client, 720 struct ib_device *device, u8 port_num, 721 struct ib_sa_path_rec *rec, 722 ib_sa_comp_mask comp_mask, 723 int timeout_ms, gfp_t gfp_mask, 724 void (*callback)(int status, 725 struct ib_sa_path_rec *resp, 726 void *context), 727 void *context, 728 struct ib_sa_query **sa_query) 729 { 730 struct ib_sa_path_query *query; 731 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 732 struct ib_sa_port *port; 733 struct ib_mad_agent *agent; 734 struct ib_sa_mad *mad; 735 int ret; 736 737 if (!sa_dev) 738 return -ENODEV; 739 740 port = &sa_dev->port[port_num - sa_dev->start_port]; 741 agent = port->agent; 742 743 query = kmalloc(sizeof *query, gfp_mask); 744 if (!query) 745 return -ENOMEM; 746 747 query->sa_query.port = port; 748 ret = alloc_mad(&query->sa_query, gfp_mask); 749 if (ret) 750 goto err1; 751 752 ib_sa_client_get(client); 753 query->sa_query.client = client; 754 query->callback = callback; 755 query->context = context; 756 757 mad = query->sa_query.mad_buf->mad; 758 init_mad(mad, agent); 759 760 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL; 761 query->sa_query.release = ib_sa_path_rec_release; 762 mad->mad_hdr.method = IB_MGMT_METHOD_GET; 763 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC); 764 mad->sa_hdr.comp_mask = comp_mask; 765 766 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data); 767 768 *sa_query = &query->sa_query; 769 770 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 771 if (ret < 0) 772 goto err2; 773 774 return ret; 775 776 err2: 777 *sa_query = NULL; 778 ib_sa_client_put(query->sa_query.client); 779 free_mad(&query->sa_query); 780 781 err1: 782 kfree(query); 783 return ret; 784 } 785 EXPORT_SYMBOL(ib_sa_path_rec_get); 786 787 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query, 788 int status, 789 struct ib_sa_mad *mad) 790 { 791 struct ib_sa_service_query *query = 792 container_of(sa_query, struct ib_sa_service_query, sa_query); 793 794 if (mad) { 795 struct ib_sa_service_rec rec; 796 797 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table), 798 mad->data, &rec); 799 query->callback(status, &rec, query->context); 800 } else 801 query->callback(status, NULL, query->context); 802 } 803 804 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query) 805 { 806 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query)); 807 } 808 809 /** 810 * ib_sa_service_rec_query - Start Service Record operation 811 * @client:SA client 812 * @device:device to send request on 813 * @port_num: port number to send request on 814 * @method:SA method - should be get, set, or delete 815 * @rec:Service Record to send in request 816 * @comp_mask:component mask to send in request 817 * @timeout_ms:time to wait for response 818 * @gfp_mask:GFP mask to use for internal allocations 819 * @callback:function called when request completes, times out or is 820 * canceled 821 * @context:opaque user context passed to callback 822 * @sa_query:request context, used to cancel request 823 * 824 * Send a Service Record set/get/delete to the SA to register, 825 * unregister or query a service record. 826 * The callback function will be called when the request completes (or 827 * fails); status is 0 for a successful response, -EINTR if the query 828 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error 829 * occurred sending the query. The resp parameter of the callback is 830 * only valid if status is 0. 831 * 832 * If the return value of ib_sa_service_rec_query() is negative, it is an 833 * error code. Otherwise it is a request ID that can be used to cancel 834 * the query. 835 */ 836 int ib_sa_service_rec_query(struct ib_sa_client *client, 837 struct ib_device *device, u8 port_num, u8 method, 838 struct ib_sa_service_rec *rec, 839 ib_sa_comp_mask comp_mask, 840 int timeout_ms, gfp_t gfp_mask, 841 void (*callback)(int status, 842 struct ib_sa_service_rec *resp, 843 void *context), 844 void *context, 845 struct ib_sa_query **sa_query) 846 { 847 struct ib_sa_service_query *query; 848 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 849 struct ib_sa_port *port; 850 struct ib_mad_agent *agent; 851 struct ib_sa_mad *mad; 852 int ret; 853 854 if (!sa_dev) 855 return -ENODEV; 856 857 port = &sa_dev->port[port_num - sa_dev->start_port]; 858 agent = port->agent; 859 860 if (method != IB_MGMT_METHOD_GET && 861 method != IB_MGMT_METHOD_SET && 862 method != IB_SA_METHOD_DELETE) 863 return -EINVAL; 864 865 query = kmalloc(sizeof *query, gfp_mask); 866 if (!query) 867 return -ENOMEM; 868 869 query->sa_query.port = port; 870 ret = alloc_mad(&query->sa_query, gfp_mask); 871 if (ret) 872 goto err1; 873 874 ib_sa_client_get(client); 875 query->sa_query.client = client; 876 query->callback = callback; 877 query->context = context; 878 879 mad = query->sa_query.mad_buf->mad; 880 init_mad(mad, agent); 881 882 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL; 883 query->sa_query.release = ib_sa_service_rec_release; 884 mad->mad_hdr.method = method; 885 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC); 886 mad->sa_hdr.comp_mask = comp_mask; 887 888 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table), 889 rec, mad->data); 890 891 *sa_query = &query->sa_query; 892 893 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 894 if (ret < 0) 895 goto err2; 896 897 return ret; 898 899 err2: 900 *sa_query = NULL; 901 ib_sa_client_put(query->sa_query.client); 902 free_mad(&query->sa_query); 903 904 err1: 905 kfree(query); 906 return ret; 907 } 908 EXPORT_SYMBOL(ib_sa_service_rec_query); 909 910 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query, 911 int status, 912 struct ib_sa_mad *mad) 913 { 914 struct ib_sa_mcmember_query *query = 915 container_of(sa_query, struct ib_sa_mcmember_query, sa_query); 916 917 if (mad) { 918 struct ib_sa_mcmember_rec rec; 919 920 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 921 mad->data, &rec); 922 query->callback(status, &rec, query->context); 923 } else 924 query->callback(status, NULL, query->context); 925 } 926 927 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query) 928 { 929 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query)); 930 } 931 932 int ib_sa_mcmember_rec_query(struct ib_sa_client *client, 933 struct ib_device *device, u8 port_num, 934 u8 method, 935 struct ib_sa_mcmember_rec *rec, 936 ib_sa_comp_mask comp_mask, 937 int timeout_ms, gfp_t gfp_mask, 938 void (*callback)(int status, 939 struct ib_sa_mcmember_rec *resp, 940 void *context), 941 void *context, 942 struct ib_sa_query **sa_query) 943 { 944 struct ib_sa_mcmember_query *query; 945 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 946 struct ib_sa_port *port; 947 struct ib_mad_agent *agent; 948 struct ib_sa_mad *mad; 949 int ret; 950 951 if (!sa_dev) 952 return -ENODEV; 953 954 port = &sa_dev->port[port_num - sa_dev->start_port]; 955 agent = port->agent; 956 957 query = kmalloc(sizeof *query, gfp_mask); 958 if (!query) 959 return -ENOMEM; 960 961 query->sa_query.port = port; 962 ret = alloc_mad(&query->sa_query, gfp_mask); 963 if (ret) 964 goto err1; 965 966 ib_sa_client_get(client); 967 query->sa_query.client = client; 968 query->callback = callback; 969 query->context = context; 970 971 mad = query->sa_query.mad_buf->mad; 972 init_mad(mad, agent); 973 974 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL; 975 query->sa_query.release = ib_sa_mcmember_rec_release; 976 mad->mad_hdr.method = method; 977 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC); 978 mad->sa_hdr.comp_mask = comp_mask; 979 980 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table), 981 rec, mad->data); 982 983 *sa_query = &query->sa_query; 984 985 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 986 if (ret < 0) 987 goto err2; 988 989 return ret; 990 991 err2: 992 *sa_query = NULL; 993 ib_sa_client_put(query->sa_query.client); 994 free_mad(&query->sa_query); 995 996 err1: 997 kfree(query); 998 return ret; 999 } 1000 1001 /* Support GuidInfoRecord */ 1002 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query, 1003 int status, 1004 struct ib_sa_mad *mad) 1005 { 1006 struct ib_sa_guidinfo_query *query = 1007 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query); 1008 1009 if (mad) { 1010 struct ib_sa_guidinfo_rec rec; 1011 1012 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), 1013 mad->data, &rec); 1014 query->callback(status, &rec, query->context); 1015 } else 1016 query->callback(status, NULL, query->context); 1017 } 1018 1019 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query) 1020 { 1021 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query)); 1022 } 1023 1024 int ib_sa_guid_info_rec_query(struct ib_sa_client *client, 1025 struct ib_device *device, u8 port_num, 1026 struct ib_sa_guidinfo_rec *rec, 1027 ib_sa_comp_mask comp_mask, u8 method, 1028 int timeout_ms, gfp_t gfp_mask, 1029 void (*callback)(int status, 1030 struct ib_sa_guidinfo_rec *resp, 1031 void *context), 1032 void *context, 1033 struct ib_sa_query **sa_query) 1034 { 1035 struct ib_sa_guidinfo_query *query; 1036 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1037 struct ib_sa_port *port; 1038 struct ib_mad_agent *agent; 1039 struct ib_sa_mad *mad; 1040 int ret; 1041 1042 if (!sa_dev) 1043 return -ENODEV; 1044 1045 if (method != IB_MGMT_METHOD_GET && 1046 method != IB_MGMT_METHOD_SET && 1047 method != IB_SA_METHOD_DELETE) { 1048 return -EINVAL; 1049 } 1050 1051 port = &sa_dev->port[port_num - sa_dev->start_port]; 1052 agent = port->agent; 1053 1054 query = kmalloc(sizeof *query, gfp_mask); 1055 if (!query) 1056 return -ENOMEM; 1057 1058 query->sa_query.port = port; 1059 ret = alloc_mad(&query->sa_query, gfp_mask); 1060 if (ret) 1061 goto err1; 1062 1063 ib_sa_client_get(client); 1064 query->sa_query.client = client; 1065 query->callback = callback; 1066 query->context = context; 1067 1068 mad = query->sa_query.mad_buf->mad; 1069 init_mad(mad, agent); 1070 1071 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL; 1072 query->sa_query.release = ib_sa_guidinfo_rec_release; 1073 1074 mad->mad_hdr.method = method; 1075 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC); 1076 mad->sa_hdr.comp_mask = comp_mask; 1077 1078 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec, 1079 mad->data); 1080 1081 *sa_query = &query->sa_query; 1082 1083 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); 1084 if (ret < 0) 1085 goto err2; 1086 1087 return ret; 1088 1089 err2: 1090 *sa_query = NULL; 1091 ib_sa_client_put(query->sa_query.client); 1092 free_mad(&query->sa_query); 1093 1094 err1: 1095 kfree(query); 1096 return ret; 1097 } 1098 EXPORT_SYMBOL(ib_sa_guid_info_rec_query); 1099 1100 static void send_handler(struct ib_mad_agent *agent, 1101 struct ib_mad_send_wc *mad_send_wc) 1102 { 1103 struct ib_sa_query *query = mad_send_wc->send_buf->context[0]; 1104 unsigned long flags; 1105 1106 if (query->callback) 1107 switch (mad_send_wc->status) { 1108 case IB_WC_SUCCESS: 1109 /* No callback -- already got recv */ 1110 break; 1111 case IB_WC_RESP_TIMEOUT_ERR: 1112 query->callback(query, -ETIMEDOUT, NULL); 1113 break; 1114 case IB_WC_WR_FLUSH_ERR: 1115 query->callback(query, -EINTR, NULL); 1116 break; 1117 default: 1118 query->callback(query, -EIO, NULL); 1119 break; 1120 } 1121 1122 spin_lock_irqsave(&idr_lock, flags); 1123 idr_remove(&query_idr, query->id); 1124 spin_unlock_irqrestore(&idr_lock, flags); 1125 1126 free_mad(query); 1127 ib_sa_client_put(query->client); 1128 query->release(query); 1129 } 1130 1131 static void recv_handler(struct ib_mad_agent *mad_agent, 1132 struct ib_mad_recv_wc *mad_recv_wc) 1133 { 1134 struct ib_sa_query *query; 1135 struct ib_mad_send_buf *mad_buf; 1136 1137 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id; 1138 query = mad_buf->context[0]; 1139 1140 if (query->callback) { 1141 if (mad_recv_wc->wc->status == IB_WC_SUCCESS) 1142 query->callback(query, 1143 mad_recv_wc->recv_buf.mad->mad_hdr.status ? 1144 -EINVAL : 0, 1145 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad); 1146 else 1147 query->callback(query, -EIO, NULL); 1148 } 1149 1150 ib_free_recv_mad(mad_recv_wc); 1151 } 1152 1153 static void ib_sa_add_one(struct ib_device *device) 1154 { 1155 struct ib_sa_device *sa_dev; 1156 int s, e, i; 1157 int count = 0; 1158 1159 s = rdma_start_port(device); 1160 e = rdma_end_port(device); 1161 1162 sa_dev = kzalloc(sizeof *sa_dev + 1163 (e - s + 1) * sizeof (struct ib_sa_port), 1164 GFP_KERNEL); 1165 if (!sa_dev) 1166 return; 1167 1168 sa_dev->start_port = s; 1169 sa_dev->end_port = e; 1170 1171 for (i = 0; i <= e - s; ++i) { 1172 spin_lock_init(&sa_dev->port[i].ah_lock); 1173 if (!rdma_cap_ib_sa(device, i + 1)) 1174 continue; 1175 1176 sa_dev->port[i].sm_ah = NULL; 1177 sa_dev->port[i].port_num = i + s; 1178 1179 sa_dev->port[i].agent = 1180 ib_register_mad_agent(device, i + s, IB_QPT_GSI, 1181 NULL, 0, send_handler, 1182 recv_handler, sa_dev, 0); 1183 if (IS_ERR(sa_dev->port[i].agent)) 1184 goto err; 1185 1186 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah); 1187 1188 count++; 1189 } 1190 1191 if (!count) 1192 goto free; 1193 1194 ib_set_client_data(device, &sa_client, sa_dev); 1195 1196 /* 1197 * We register our event handler after everything is set up, 1198 * and then update our cached info after the event handler is 1199 * registered to avoid any problems if a port changes state 1200 * during our initialization. 1201 */ 1202 1203 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event); 1204 if (ib_register_event_handler(&sa_dev->event_handler)) 1205 goto err; 1206 1207 for (i = 0; i <= e - s; ++i) { 1208 if (rdma_cap_ib_sa(device, i + 1)) 1209 update_sm_ah(&sa_dev->port[i].update_task); 1210 } 1211 1212 return; 1213 1214 err: 1215 while (--i >= 0) { 1216 if (rdma_cap_ib_sa(device, i + 1)) 1217 ib_unregister_mad_agent(sa_dev->port[i].agent); 1218 } 1219 free: 1220 kfree(sa_dev); 1221 return; 1222 } 1223 1224 static void ib_sa_remove_one(struct ib_device *device) 1225 { 1226 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client); 1227 int i; 1228 1229 if (!sa_dev) 1230 return; 1231 1232 ib_unregister_event_handler(&sa_dev->event_handler); 1233 1234 flush_workqueue(ib_wq); 1235 1236 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) { 1237 if (rdma_cap_ib_sa(device, i + 1)) { 1238 ib_unregister_mad_agent(sa_dev->port[i].agent); 1239 if (sa_dev->port[i].sm_ah) 1240 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah); 1241 } 1242 1243 } 1244 1245 kfree(sa_dev); 1246 } 1247 1248 static int __init ib_sa_init(void) 1249 { 1250 int ret; 1251 1252 get_random_bytes(&tid, sizeof tid); 1253 1254 ret = ib_register_client(&sa_client); 1255 if (ret) { 1256 printk(KERN_ERR "Couldn't register ib_sa client\n"); 1257 goto err1; 1258 } 1259 1260 ret = mcast_init(); 1261 if (ret) { 1262 printk(KERN_ERR "Couldn't initialize multicast handling\n"); 1263 goto err2; 1264 } 1265 1266 return 0; 1267 err2: 1268 ib_unregister_client(&sa_client); 1269 err1: 1270 return ret; 1271 } 1272 1273 static void __exit ib_sa_cleanup(void) 1274 { 1275 mcast_cleanup(); 1276 ib_unregister_client(&sa_client); 1277 idr_destroy(&query_idr); 1278 } 1279 1280 module_init(ib_sa_init); 1281 module_exit(ib_sa_cleanup); 1282