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