1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 3 * 4 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. 5 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 6 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 7 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 8 * 9 * This software is available to you under a choice of one of two 10 * licenses. You may choose to be licensed under the terms of the GNU 11 * General Public License (GPL) Version 2, available from the file 12 * COPYING in the main directory of this source tree, or the 13 * OpenIB.org BSD license below: 14 * 15 * Redistribution and use in source and binary forms, with or 16 * without modification, are permitted provided that the following 17 * conditions are met: 18 * 19 * - Redistributions of source code must retain the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer. 22 * 23 * - Redistributions in binary form must reproduce the above 24 * copyright notice, this list of conditions and the following 25 * disclaimer in the documentation and/or other materials 26 * provided with the distribution. 27 * 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 35 * SOFTWARE. 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <linux/completion.h> 42 #include <linux/dma-mapping.h> 43 #include <linux/device.h> 44 #include <linux/module.h> 45 #include <linux/err.h> 46 #include <linux/idr.h> 47 #include <linux/interrupt.h> 48 #include <linux/random.h> 49 #include <linux/rbtree.h> 50 #include <linux/spinlock.h> 51 #include <linux/slab.h> 52 #include <linux/sysfs.h> 53 #include <linux/workqueue.h> 54 #include <linux/kdev_t.h> 55 #include <linux/etherdevice.h> 56 57 #include <asm/atomic-long.h> 58 59 #include <rdma/ib_cache.h> 60 #include <rdma/ib_cm.h> 61 #include "cm_msgs.h" 62 63 MODULE_AUTHOR("Sean Hefty"); 64 MODULE_DESCRIPTION("InfiniBand CM"); 65 MODULE_LICENSE("Dual BSD/GPL"); 66 67 static void cm_add_one(struct ib_device *device); 68 static void cm_remove_one(struct ib_device *device, void *client_data); 69 70 static struct ib_client cm_client = { 71 .name = "cm", 72 .add = cm_add_one, 73 .remove = cm_remove_one 74 }; 75 76 static struct ib_cm { 77 spinlock_t lock; 78 struct list_head device_list; 79 rwlock_t device_lock; 80 struct rb_root listen_service_table; 81 u64 listen_service_id; 82 /* struct rb_root peer_service_table; todo: fix peer to peer */ 83 struct rb_root remote_qp_table; 84 struct rb_root remote_id_table; 85 struct rb_root remote_sidr_table; 86 struct idr local_id_table; 87 __be32 random_id_operand; 88 struct list_head timewait_list; 89 struct workqueue_struct *wq; 90 /* Sync on cm change port state */ 91 spinlock_t state_lock; 92 } cm; 93 94 /* Counter indexes ordered by attribute ID */ 95 enum { 96 CM_REQ_COUNTER, 97 CM_MRA_COUNTER, 98 CM_REJ_COUNTER, 99 CM_REP_COUNTER, 100 CM_RTU_COUNTER, 101 CM_DREQ_COUNTER, 102 CM_DREP_COUNTER, 103 CM_SIDR_REQ_COUNTER, 104 CM_SIDR_REP_COUNTER, 105 CM_LAP_COUNTER, 106 CM_APR_COUNTER, 107 CM_ATTR_COUNT, 108 CM_ATTR_ID_OFFSET = 0x0010, 109 }; 110 111 enum { 112 CM_XMIT, 113 CM_XMIT_RETRIES, 114 CM_RECV, 115 CM_RECV_DUPLICATES, 116 CM_COUNTER_GROUPS 117 }; 118 119 static char const counter_group_names[CM_COUNTER_GROUPS] 120 [sizeof("cm_rx_duplicates")] = { 121 "cm_tx_msgs", "cm_tx_retries", 122 "cm_rx_msgs", "cm_rx_duplicates" 123 }; 124 125 struct cm_counter_group { 126 struct kobject obj; 127 atomic_long_t counter[CM_ATTR_COUNT]; 128 }; 129 130 struct cm_counter_attribute { 131 struct attribute attr; 132 int index; 133 }; 134 135 #define CM_COUNTER_ATTR(_name, _index) \ 136 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 137 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 138 .index = _index \ 139 } 140 141 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 142 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 143 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 144 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 145 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 146 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 147 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 148 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 149 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 150 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 151 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 152 153 static struct attribute *cm_counter_default_attrs[] = { 154 &cm_req_counter_attr.attr, 155 &cm_mra_counter_attr.attr, 156 &cm_rej_counter_attr.attr, 157 &cm_rep_counter_attr.attr, 158 &cm_rtu_counter_attr.attr, 159 &cm_dreq_counter_attr.attr, 160 &cm_drep_counter_attr.attr, 161 &cm_sidr_req_counter_attr.attr, 162 &cm_sidr_rep_counter_attr.attr, 163 &cm_lap_counter_attr.attr, 164 &cm_apr_counter_attr.attr, 165 NULL 166 }; 167 168 struct cm_port { 169 struct cm_device *cm_dev; 170 struct ib_mad_agent *mad_agent; 171 struct kobject port_obj; 172 u8 port_num; 173 struct list_head cm_priv_prim_list; 174 struct list_head cm_priv_altr_list; 175 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 176 }; 177 178 struct cm_device { 179 struct list_head list; 180 struct ib_device *ib_device; 181 struct device *device; 182 u8 ack_delay; 183 int going_down; 184 struct cm_port *port[0]; 185 }; 186 187 struct cm_av { 188 struct cm_port *port; 189 union ib_gid dgid; 190 struct ib_ah_attr ah_attr; 191 u16 pkey_index; 192 u8 timeout; 193 }; 194 195 struct cm_work { 196 struct delayed_work work; 197 struct list_head list; 198 struct cm_port *port; 199 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 200 __be32 local_id; /* Established / timewait */ 201 __be32 remote_id; 202 struct ib_cm_event cm_event; 203 struct ib_sa_path_rec path[0]; 204 }; 205 206 struct cm_timewait_info { 207 struct cm_work work; /* Must be first. */ 208 struct list_head list; 209 struct rb_node remote_qp_node; 210 struct rb_node remote_id_node; 211 __be64 remote_ca_guid; 212 __be32 remote_qpn; 213 u8 inserted_remote_qp; 214 u8 inserted_remote_id; 215 }; 216 217 struct cm_id_private { 218 struct ib_cm_id id; 219 220 struct rb_node service_node; 221 struct rb_node sidr_id_node; 222 spinlock_t lock; /* Do not acquire inside cm.lock */ 223 struct completion comp; 224 atomic_t refcount; 225 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 226 * Protected by the cm.lock spinlock. */ 227 int listen_sharecount; 228 229 struct ib_mad_send_buf *msg; 230 struct cm_timewait_info *timewait_info; 231 /* todo: use alternate port on send failure */ 232 struct cm_av av; 233 struct cm_av alt_av; 234 235 void *private_data; 236 __be64 tid; 237 __be32 local_qpn; 238 __be32 remote_qpn; 239 enum ib_qp_type qp_type; 240 __be32 sq_psn; 241 __be32 rq_psn; 242 int timeout_ms; 243 enum ib_mtu path_mtu; 244 __be16 pkey; 245 u8 private_data_len; 246 u8 max_cm_retries; 247 u8 peer_to_peer; 248 u8 responder_resources; 249 u8 initiator_depth; 250 u8 retry_count; 251 u8 rnr_retry_count; 252 u8 service_timeout; 253 u8 target_ack_delay; 254 255 struct list_head prim_list; 256 struct list_head altr_list; 257 /* Indicates that the send port mad is registered and av is set */ 258 int prim_send_port_not_ready; 259 int altr_send_port_not_ready; 260 261 struct list_head work_list; 262 atomic_t work_count; 263 }; 264 265 static void cm_work_handler(struct work_struct *work); 266 267 static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 268 { 269 if (atomic_dec_and_test(&cm_id_priv->refcount)) 270 complete(&cm_id_priv->comp); 271 } 272 273 static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 274 struct ib_mad_send_buf **msg) 275 { 276 struct ib_mad_agent *mad_agent; 277 struct ib_mad_send_buf *m; 278 struct ib_ah *ah; 279 struct cm_av *av; 280 unsigned long flags, flags2; 281 int ret = 0; 282 283 /* don't let the port to be released till the agent is down */ 284 spin_lock_irqsave(&cm.state_lock, flags2); 285 spin_lock_irqsave(&cm.lock, flags); 286 if (!cm_id_priv->prim_send_port_not_ready) 287 av = &cm_id_priv->av; 288 else if (!cm_id_priv->altr_send_port_not_ready && 289 (cm_id_priv->alt_av.port)) 290 av = &cm_id_priv->alt_av; 291 else { 292 pr_info("%s: not valid CM id\n", __func__); 293 ret = -ENODEV; 294 spin_unlock_irqrestore(&cm.lock, flags); 295 goto out; 296 } 297 spin_unlock_irqrestore(&cm.lock, flags); 298 /* Make sure the port haven't released the mad yet */ 299 mad_agent = cm_id_priv->av.port->mad_agent; 300 if (!mad_agent) { 301 pr_info("%s: not a valid MAD agent\n", __func__); 302 ret = -ENODEV; 303 goto out; 304 } 305 ah = ib_create_ah(mad_agent->qp->pd, &av->ah_attr); 306 if (IS_ERR(ah)) { 307 ret = PTR_ERR(ah); 308 goto out; 309 } 310 311 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 312 av->pkey_index, 313 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 314 GFP_ATOMIC, 315 IB_MGMT_BASE_VERSION); 316 if (IS_ERR(m)) { 317 ib_destroy_ah(ah); 318 ret = PTR_ERR(m); 319 goto out; 320 } 321 322 /* Timeout set by caller if response is expected. */ 323 m->ah = ah; 324 m->retries = cm_id_priv->max_cm_retries; 325 326 atomic_inc(&cm_id_priv->refcount); 327 m->context[0] = cm_id_priv; 328 *msg = m; 329 330 out: 331 spin_unlock_irqrestore(&cm.state_lock, flags2); 332 return ret; 333 } 334 335 static int cm_alloc_response_msg(struct cm_port *port, 336 struct ib_mad_recv_wc *mad_recv_wc, 337 struct ib_mad_send_buf **msg) 338 { 339 struct ib_mad_send_buf *m; 340 struct ib_ah *ah; 341 342 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 343 mad_recv_wc->recv_buf.grh, port->port_num); 344 if (IS_ERR(ah)) 345 return PTR_ERR(ah); 346 347 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 348 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 349 GFP_ATOMIC, 350 IB_MGMT_BASE_VERSION); 351 if (IS_ERR(m)) { 352 ib_destroy_ah(ah); 353 return PTR_ERR(m); 354 } 355 m->ah = ah; 356 *msg = m; 357 return 0; 358 } 359 360 static void cm_free_msg(struct ib_mad_send_buf *msg) 361 { 362 ib_destroy_ah(msg->ah); 363 if (msg->context[0]) 364 cm_deref_id(msg->context[0]); 365 ib_free_send_mad(msg); 366 } 367 368 static void * cm_copy_private_data(const void *private_data, 369 u8 private_data_len) 370 { 371 void *data; 372 373 if (!private_data || !private_data_len) 374 return NULL; 375 376 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 377 if (!data) 378 return ERR_PTR(-ENOMEM); 379 380 return data; 381 } 382 383 static void cm_set_private_data(struct cm_id_private *cm_id_priv, 384 void *private_data, u8 private_data_len) 385 { 386 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 387 kfree(cm_id_priv->private_data); 388 389 cm_id_priv->private_data = private_data; 390 cm_id_priv->private_data_len = private_data_len; 391 } 392 393 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 394 struct ib_grh *grh, struct cm_av *av) 395 { 396 av->port = port; 397 av->pkey_index = wc->pkey_index; 398 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 399 grh, &av->ah_attr); 400 } 401 402 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av, 403 struct cm_id_private *cm_id_priv) 404 { 405 struct cm_device *cm_dev; 406 struct cm_port *port = NULL; 407 unsigned long flags; 408 int ret; 409 u8 p; 410 struct net_device *ndev = ib_get_ndev_from_path(path); 411 412 read_lock_irqsave(&cm.device_lock, flags); 413 list_for_each_entry(cm_dev, &cm.device_list, list) { 414 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 415 path->gid_type, ndev, &p, NULL)) { 416 port = cm_dev->port[p-1]; 417 break; 418 } 419 } 420 read_unlock_irqrestore(&cm.device_lock, flags); 421 422 if (ndev) 423 dev_put(ndev); 424 425 if (!port) 426 return -EINVAL; 427 428 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 429 be16_to_cpu(path->pkey), &av->pkey_index); 430 if (ret) 431 return ret; 432 433 av->port = port; 434 ret = ib_init_ah_from_path(cm_dev->ib_device, port->port_num, 435 path, &av->ah_attr); 436 if (ret) 437 return ret; 438 439 av->timeout = path->packet_life_time + 1; 440 441 spin_lock_irqsave(&cm.lock, flags); 442 if (&cm_id_priv->av == av) 443 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list); 444 else if (&cm_id_priv->alt_av == av) 445 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list); 446 else 447 ret = -EINVAL; 448 449 spin_unlock_irqrestore(&cm.lock, flags); 450 451 return ret; 452 } 453 454 static int cm_alloc_id(struct cm_id_private *cm_id_priv) 455 { 456 unsigned long flags; 457 int id; 458 459 idr_preload(GFP_KERNEL); 460 spin_lock_irqsave(&cm.lock, flags); 461 462 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT); 463 464 spin_unlock_irqrestore(&cm.lock, flags); 465 idr_preload_end(); 466 467 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 468 return id < 0 ? id : 0; 469 } 470 471 static void cm_free_id(__be32 local_id) 472 { 473 spin_lock_irq(&cm.lock); 474 idr_remove(&cm.local_id_table, 475 (__force int) (local_id ^ cm.random_id_operand)); 476 spin_unlock_irq(&cm.lock); 477 } 478 479 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 480 { 481 struct cm_id_private *cm_id_priv; 482 483 cm_id_priv = idr_find(&cm.local_id_table, 484 (__force int) (local_id ^ cm.random_id_operand)); 485 if (cm_id_priv) { 486 if (cm_id_priv->id.remote_id == remote_id) 487 atomic_inc(&cm_id_priv->refcount); 488 else 489 cm_id_priv = NULL; 490 } 491 492 return cm_id_priv; 493 } 494 495 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 496 { 497 struct cm_id_private *cm_id_priv; 498 499 spin_lock_irq(&cm.lock); 500 cm_id_priv = cm_get_id(local_id, remote_id); 501 spin_unlock_irq(&cm.lock); 502 503 return cm_id_priv; 504 } 505 506 /* 507 * Trivial helpers to strip endian annotation and compare; the 508 * endianness doesn't actually matter since we just need a stable 509 * order for the RB tree. 510 */ 511 static int be32_lt(__be32 a, __be32 b) 512 { 513 return (__force u32) a < (__force u32) b; 514 } 515 516 static int be32_gt(__be32 a, __be32 b) 517 { 518 return (__force u32) a > (__force u32) b; 519 } 520 521 static int be64_lt(__be64 a, __be64 b) 522 { 523 return (__force u64) a < (__force u64) b; 524 } 525 526 static int be64_gt(__be64 a, __be64 b) 527 { 528 return (__force u64) a > (__force u64) b; 529 } 530 531 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 532 { 533 struct rb_node **link = &cm.listen_service_table.rb_node; 534 struct rb_node *parent = NULL; 535 struct cm_id_private *cur_cm_id_priv; 536 __be64 service_id = cm_id_priv->id.service_id; 537 __be64 service_mask = cm_id_priv->id.service_mask; 538 539 while (*link) { 540 parent = *link; 541 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 542 service_node); 543 if ((cur_cm_id_priv->id.service_mask & service_id) == 544 (service_mask & cur_cm_id_priv->id.service_id) && 545 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) 546 return cur_cm_id_priv; 547 548 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 549 link = &(*link)->rb_left; 550 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 551 link = &(*link)->rb_right; 552 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 553 link = &(*link)->rb_left; 554 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 555 link = &(*link)->rb_right; 556 else 557 link = &(*link)->rb_right; 558 } 559 rb_link_node(&cm_id_priv->service_node, parent, link); 560 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 561 return NULL; 562 } 563 564 static struct cm_id_private * cm_find_listen(struct ib_device *device, 565 __be64 service_id) 566 { 567 struct rb_node *node = cm.listen_service_table.rb_node; 568 struct cm_id_private *cm_id_priv; 569 570 while (node) { 571 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 572 if ((cm_id_priv->id.service_mask & service_id) == 573 cm_id_priv->id.service_id && 574 (cm_id_priv->id.device == device)) 575 return cm_id_priv; 576 577 if (device < cm_id_priv->id.device) 578 node = node->rb_left; 579 else if (device > cm_id_priv->id.device) 580 node = node->rb_right; 581 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 582 node = node->rb_left; 583 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 584 node = node->rb_right; 585 else 586 node = node->rb_right; 587 } 588 return NULL; 589 } 590 591 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 592 *timewait_info) 593 { 594 struct rb_node **link = &cm.remote_id_table.rb_node; 595 struct rb_node *parent = NULL; 596 struct cm_timewait_info *cur_timewait_info; 597 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 598 __be32 remote_id = timewait_info->work.remote_id; 599 600 while (*link) { 601 parent = *link; 602 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 603 remote_id_node); 604 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 605 link = &(*link)->rb_left; 606 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 607 link = &(*link)->rb_right; 608 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 609 link = &(*link)->rb_left; 610 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 611 link = &(*link)->rb_right; 612 else 613 return cur_timewait_info; 614 } 615 timewait_info->inserted_remote_id = 1; 616 rb_link_node(&timewait_info->remote_id_node, parent, link); 617 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 618 return NULL; 619 } 620 621 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 622 __be32 remote_id) 623 { 624 struct rb_node *node = cm.remote_id_table.rb_node; 625 struct cm_timewait_info *timewait_info; 626 627 while (node) { 628 timewait_info = rb_entry(node, struct cm_timewait_info, 629 remote_id_node); 630 if (be32_lt(remote_id, timewait_info->work.remote_id)) 631 node = node->rb_left; 632 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 633 node = node->rb_right; 634 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 635 node = node->rb_left; 636 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 637 node = node->rb_right; 638 else 639 return timewait_info; 640 } 641 return NULL; 642 } 643 644 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 645 *timewait_info) 646 { 647 struct rb_node **link = &cm.remote_qp_table.rb_node; 648 struct rb_node *parent = NULL; 649 struct cm_timewait_info *cur_timewait_info; 650 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 651 __be32 remote_qpn = timewait_info->remote_qpn; 652 653 while (*link) { 654 parent = *link; 655 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 656 remote_qp_node); 657 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 658 link = &(*link)->rb_left; 659 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 660 link = &(*link)->rb_right; 661 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 662 link = &(*link)->rb_left; 663 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 664 link = &(*link)->rb_right; 665 else 666 return cur_timewait_info; 667 } 668 timewait_info->inserted_remote_qp = 1; 669 rb_link_node(&timewait_info->remote_qp_node, parent, link); 670 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 671 return NULL; 672 } 673 674 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 675 *cm_id_priv) 676 { 677 struct rb_node **link = &cm.remote_sidr_table.rb_node; 678 struct rb_node *parent = NULL; 679 struct cm_id_private *cur_cm_id_priv; 680 union ib_gid *port_gid = &cm_id_priv->av.dgid; 681 __be32 remote_id = cm_id_priv->id.remote_id; 682 683 while (*link) { 684 parent = *link; 685 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 686 sidr_id_node); 687 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 688 link = &(*link)->rb_left; 689 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 690 link = &(*link)->rb_right; 691 else { 692 int cmp; 693 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 694 sizeof *port_gid); 695 if (cmp < 0) 696 link = &(*link)->rb_left; 697 else if (cmp > 0) 698 link = &(*link)->rb_right; 699 else 700 return cur_cm_id_priv; 701 } 702 } 703 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 704 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 705 return NULL; 706 } 707 708 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 709 enum ib_cm_sidr_status status) 710 { 711 struct ib_cm_sidr_rep_param param; 712 713 memset(¶m, 0, sizeof param); 714 param.status = status; 715 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 716 } 717 718 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 719 ib_cm_handler cm_handler, 720 void *context) 721 { 722 struct cm_id_private *cm_id_priv; 723 int ret; 724 725 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 726 if (!cm_id_priv) 727 return ERR_PTR(-ENOMEM); 728 729 cm_id_priv->id.state = IB_CM_IDLE; 730 cm_id_priv->id.device = device; 731 cm_id_priv->id.cm_handler = cm_handler; 732 cm_id_priv->id.context = context; 733 cm_id_priv->id.remote_cm_qpn = 1; 734 ret = cm_alloc_id(cm_id_priv); 735 if (ret) 736 goto error; 737 738 spin_lock_init(&cm_id_priv->lock); 739 init_completion(&cm_id_priv->comp); 740 INIT_LIST_HEAD(&cm_id_priv->work_list); 741 INIT_LIST_HEAD(&cm_id_priv->prim_list); 742 INIT_LIST_HEAD(&cm_id_priv->altr_list); 743 atomic_set(&cm_id_priv->work_count, -1); 744 atomic_set(&cm_id_priv->refcount, 1); 745 return &cm_id_priv->id; 746 747 error: 748 kfree(cm_id_priv); 749 return ERR_PTR(-ENOMEM); 750 } 751 EXPORT_SYMBOL(ib_create_cm_id); 752 753 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 754 { 755 struct cm_work *work; 756 757 if (list_empty(&cm_id_priv->work_list)) 758 return NULL; 759 760 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 761 list_del(&work->list); 762 return work; 763 } 764 765 static void cm_free_work(struct cm_work *work) 766 { 767 if (work->mad_recv_wc) 768 ib_free_recv_mad(work->mad_recv_wc); 769 kfree(work); 770 } 771 772 static inline int cm_convert_to_ms(int iba_time) 773 { 774 /* approximate conversion to ms from 4.096us x 2^iba_time */ 775 return 1 << max(iba_time - 8, 0); 776 } 777 778 /* 779 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 780 * Because of how ack_timeout is stored, adding one doubles the timeout. 781 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 782 * increment it (round up) only if the other is within 50%. 783 */ 784 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 785 { 786 int ack_timeout = packet_life_time + 1; 787 788 if (ack_timeout >= ca_ack_delay) 789 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 790 else 791 ack_timeout = ca_ack_delay + 792 (ack_timeout >= (ca_ack_delay - 1)); 793 794 return min(31, ack_timeout); 795 } 796 797 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 798 { 799 if (timewait_info->inserted_remote_id) { 800 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 801 timewait_info->inserted_remote_id = 0; 802 } 803 804 if (timewait_info->inserted_remote_qp) { 805 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 806 timewait_info->inserted_remote_qp = 0; 807 } 808 } 809 810 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 811 { 812 struct cm_timewait_info *timewait_info; 813 814 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 815 if (!timewait_info) 816 return ERR_PTR(-ENOMEM); 817 818 timewait_info->work.local_id = local_id; 819 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 820 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 821 return timewait_info; 822 } 823 824 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 825 { 826 int wait_time; 827 unsigned long flags; 828 struct cm_device *cm_dev; 829 830 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 831 if (!cm_dev) 832 return; 833 834 spin_lock_irqsave(&cm.lock, flags); 835 cm_cleanup_timewait(cm_id_priv->timewait_info); 836 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 837 spin_unlock_irqrestore(&cm.lock, flags); 838 839 /* 840 * The cm_id could be destroyed by the user before we exit timewait. 841 * To protect against this, we search for the cm_id after exiting 842 * timewait before notifying the user that we've exited timewait. 843 */ 844 cm_id_priv->id.state = IB_CM_TIMEWAIT; 845 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 846 847 /* Check if the device started its remove_one */ 848 spin_lock_irqsave(&cm.lock, flags); 849 if (!cm_dev->going_down) 850 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 851 msecs_to_jiffies(wait_time)); 852 spin_unlock_irqrestore(&cm.lock, flags); 853 854 cm_id_priv->timewait_info = NULL; 855 } 856 857 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 858 { 859 unsigned long flags; 860 861 cm_id_priv->id.state = IB_CM_IDLE; 862 if (cm_id_priv->timewait_info) { 863 spin_lock_irqsave(&cm.lock, flags); 864 cm_cleanup_timewait(cm_id_priv->timewait_info); 865 spin_unlock_irqrestore(&cm.lock, flags); 866 kfree(cm_id_priv->timewait_info); 867 cm_id_priv->timewait_info = NULL; 868 } 869 } 870 871 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 872 { 873 struct cm_id_private *cm_id_priv; 874 struct cm_work *work; 875 876 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 877 retest: 878 spin_lock_irq(&cm_id_priv->lock); 879 switch (cm_id->state) { 880 case IB_CM_LISTEN: 881 spin_unlock_irq(&cm_id_priv->lock); 882 883 spin_lock_irq(&cm.lock); 884 if (--cm_id_priv->listen_sharecount > 0) { 885 /* The id is still shared. */ 886 cm_deref_id(cm_id_priv); 887 spin_unlock_irq(&cm.lock); 888 return; 889 } 890 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 891 spin_unlock_irq(&cm.lock); 892 break; 893 case IB_CM_SIDR_REQ_SENT: 894 cm_id->state = IB_CM_IDLE; 895 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 896 spin_unlock_irq(&cm_id_priv->lock); 897 break; 898 case IB_CM_SIDR_REQ_RCVD: 899 spin_unlock_irq(&cm_id_priv->lock); 900 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 901 spin_lock_irq(&cm.lock); 902 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 903 rb_erase(&cm_id_priv->sidr_id_node, 904 &cm.remote_sidr_table); 905 spin_unlock_irq(&cm.lock); 906 break; 907 case IB_CM_REQ_SENT: 908 case IB_CM_MRA_REQ_RCVD: 909 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 910 spin_unlock_irq(&cm_id_priv->lock); 911 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 912 &cm_id_priv->id.device->node_guid, 913 sizeof cm_id_priv->id.device->node_guid, 914 NULL, 0); 915 break; 916 case IB_CM_REQ_RCVD: 917 if (err == -ENOMEM) { 918 /* Do not reject to allow future retries. */ 919 cm_reset_to_idle(cm_id_priv); 920 spin_unlock_irq(&cm_id_priv->lock); 921 } else { 922 spin_unlock_irq(&cm_id_priv->lock); 923 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 924 NULL, 0, NULL, 0); 925 } 926 break; 927 case IB_CM_REP_SENT: 928 case IB_CM_MRA_REP_RCVD: 929 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 930 /* Fall through */ 931 case IB_CM_MRA_REQ_SENT: 932 case IB_CM_REP_RCVD: 933 case IB_CM_MRA_REP_SENT: 934 spin_unlock_irq(&cm_id_priv->lock); 935 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 936 NULL, 0, NULL, 0); 937 break; 938 case IB_CM_ESTABLISHED: 939 spin_unlock_irq(&cm_id_priv->lock); 940 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 941 break; 942 ib_send_cm_dreq(cm_id, NULL, 0); 943 goto retest; 944 case IB_CM_DREQ_SENT: 945 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 946 cm_enter_timewait(cm_id_priv); 947 spin_unlock_irq(&cm_id_priv->lock); 948 break; 949 case IB_CM_DREQ_RCVD: 950 spin_unlock_irq(&cm_id_priv->lock); 951 ib_send_cm_drep(cm_id, NULL, 0); 952 break; 953 default: 954 spin_unlock_irq(&cm_id_priv->lock); 955 break; 956 } 957 958 spin_lock_irq(&cm.lock); 959 if (!list_empty(&cm_id_priv->altr_list) && 960 (!cm_id_priv->altr_send_port_not_ready)) 961 list_del(&cm_id_priv->altr_list); 962 if (!list_empty(&cm_id_priv->prim_list) && 963 (!cm_id_priv->prim_send_port_not_ready)) 964 list_del(&cm_id_priv->prim_list); 965 spin_unlock_irq(&cm.lock); 966 967 cm_free_id(cm_id->local_id); 968 cm_deref_id(cm_id_priv); 969 wait_for_completion(&cm_id_priv->comp); 970 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 971 cm_free_work(work); 972 kfree(cm_id_priv->private_data); 973 kfree(cm_id_priv); 974 } 975 976 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 977 { 978 cm_destroy_id(cm_id, 0); 979 } 980 EXPORT_SYMBOL(ib_destroy_cm_id); 981 982 /** 983 * __ib_cm_listen - Initiates listening on the specified service ID for 984 * connection and service ID resolution requests. 985 * @cm_id: Connection identifier associated with the listen request. 986 * @service_id: Service identifier matched against incoming connection 987 * and service ID resolution requests. The service ID should be specified 988 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 989 * assign a service ID to the caller. 990 * @service_mask: Mask applied to service ID used to listen across a 991 * range of service IDs. If set to 0, the service ID is matched 992 * exactly. This parameter is ignored if %service_id is set to 993 * IB_CM_ASSIGN_SERVICE_ID. 994 */ 995 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, 996 __be64 service_mask) 997 { 998 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 999 int ret = 0; 1000 1001 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 1002 service_id &= service_mask; 1003 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 1004 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1005 return -EINVAL; 1006 1007 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1008 if (cm_id->state != IB_CM_IDLE) 1009 return -EINVAL; 1010 1011 cm_id->state = IB_CM_LISTEN; 1012 ++cm_id_priv->listen_sharecount; 1013 1014 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 1015 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 1016 cm_id->service_mask = ~cpu_to_be64(0); 1017 } else { 1018 cm_id->service_id = service_id; 1019 cm_id->service_mask = service_mask; 1020 } 1021 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 1022 1023 if (cur_cm_id_priv) { 1024 cm_id->state = IB_CM_IDLE; 1025 --cm_id_priv->listen_sharecount; 1026 ret = -EBUSY; 1027 } 1028 return ret; 1029 } 1030 1031 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 1032 { 1033 unsigned long flags; 1034 int ret; 1035 1036 spin_lock_irqsave(&cm.lock, flags); 1037 ret = __ib_cm_listen(cm_id, service_id, service_mask); 1038 spin_unlock_irqrestore(&cm.lock, flags); 1039 1040 return ret; 1041 } 1042 EXPORT_SYMBOL(ib_cm_listen); 1043 1044 /** 1045 * Create a new listening ib_cm_id and listen on the given service ID. 1046 * 1047 * If there's an existing ID listening on that same device and service ID, 1048 * return it. 1049 * 1050 * @device: Device associated with the cm_id. All related communication will 1051 * be associated with the specified device. 1052 * @cm_handler: Callback invoked to notify the user of CM events. 1053 * @service_id: Service identifier matched against incoming connection 1054 * and service ID resolution requests. The service ID should be specified 1055 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1056 * assign a service ID to the caller. 1057 * 1058 * Callers should call ib_destroy_cm_id when done with the listener ID. 1059 */ 1060 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1061 ib_cm_handler cm_handler, 1062 __be64 service_id) 1063 { 1064 struct cm_id_private *cm_id_priv; 1065 struct ib_cm_id *cm_id; 1066 unsigned long flags; 1067 int err = 0; 1068 1069 /* Create an ID in advance, since the creation may sleep */ 1070 cm_id = ib_create_cm_id(device, cm_handler, NULL); 1071 if (IS_ERR(cm_id)) 1072 return cm_id; 1073 1074 spin_lock_irqsave(&cm.lock, flags); 1075 1076 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1077 goto new_id; 1078 1079 /* Find an existing ID */ 1080 cm_id_priv = cm_find_listen(device, service_id); 1081 if (cm_id_priv) { 1082 if (cm_id->cm_handler != cm_handler || cm_id->context) { 1083 /* Sharing an ib_cm_id with different handlers is not 1084 * supported */ 1085 spin_unlock_irqrestore(&cm.lock, flags); 1086 return ERR_PTR(-EINVAL); 1087 } 1088 atomic_inc(&cm_id_priv->refcount); 1089 ++cm_id_priv->listen_sharecount; 1090 spin_unlock_irqrestore(&cm.lock, flags); 1091 1092 ib_destroy_cm_id(cm_id); 1093 cm_id = &cm_id_priv->id; 1094 return cm_id; 1095 } 1096 1097 new_id: 1098 /* Use newly created ID */ 1099 err = __ib_cm_listen(cm_id, service_id, 0); 1100 1101 spin_unlock_irqrestore(&cm.lock, flags); 1102 1103 if (err) { 1104 ib_destroy_cm_id(cm_id); 1105 return ERR_PTR(err); 1106 } 1107 return cm_id; 1108 } 1109 EXPORT_SYMBOL(ib_cm_insert_listen); 1110 1111 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 1112 enum cm_msg_sequence msg_seq) 1113 { 1114 u64 hi_tid, low_tid; 1115 1116 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1117 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 1118 (msg_seq << 30)); 1119 return cpu_to_be64(hi_tid | low_tid); 1120 } 1121 1122 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1123 __be16 attr_id, __be64 tid) 1124 { 1125 hdr->base_version = IB_MGMT_BASE_VERSION; 1126 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1127 hdr->class_version = IB_CM_CLASS_VERSION; 1128 hdr->method = IB_MGMT_METHOD_SEND; 1129 hdr->attr_id = attr_id; 1130 hdr->tid = tid; 1131 } 1132 1133 static void cm_format_req(struct cm_req_msg *req_msg, 1134 struct cm_id_private *cm_id_priv, 1135 struct ib_cm_req_param *param) 1136 { 1137 struct ib_sa_path_rec *pri_path = param->primary_path; 1138 struct ib_sa_path_rec *alt_path = param->alternate_path; 1139 1140 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1141 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1142 1143 req_msg->local_comm_id = cm_id_priv->id.local_id; 1144 req_msg->service_id = param->service_id; 1145 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1146 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1147 cm_req_set_init_depth(req_msg, param->initiator_depth); 1148 cm_req_set_remote_resp_timeout(req_msg, 1149 param->remote_cm_response_timeout); 1150 cm_req_set_qp_type(req_msg, param->qp_type); 1151 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1152 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1153 cm_req_set_local_resp_timeout(req_msg, 1154 param->local_cm_response_timeout); 1155 req_msg->pkey = param->primary_path->pkey; 1156 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1157 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1158 1159 if (param->qp_type != IB_QPT_XRC_INI) { 1160 cm_req_set_resp_res(req_msg, param->responder_resources); 1161 cm_req_set_retry_count(req_msg, param->retry_count); 1162 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1163 cm_req_set_srq(req_msg, param->srq); 1164 } 1165 1166 if (pri_path->hop_limit <= 1) { 1167 req_msg->primary_local_lid = pri_path->slid; 1168 req_msg->primary_remote_lid = pri_path->dlid; 1169 } else { 1170 /* Work-around until there's a way to obtain remote LID info */ 1171 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1172 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1173 } 1174 req_msg->primary_local_gid = pri_path->sgid; 1175 req_msg->primary_remote_gid = pri_path->dgid; 1176 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1177 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1178 req_msg->primary_traffic_class = pri_path->traffic_class; 1179 req_msg->primary_hop_limit = pri_path->hop_limit; 1180 cm_req_set_primary_sl(req_msg, pri_path->sl); 1181 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1182 cm_req_set_primary_local_ack_timeout(req_msg, 1183 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1184 pri_path->packet_life_time)); 1185 1186 if (alt_path) { 1187 if (alt_path->hop_limit <= 1) { 1188 req_msg->alt_local_lid = alt_path->slid; 1189 req_msg->alt_remote_lid = alt_path->dlid; 1190 } else { 1191 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1192 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1193 } 1194 req_msg->alt_local_gid = alt_path->sgid; 1195 req_msg->alt_remote_gid = alt_path->dgid; 1196 cm_req_set_alt_flow_label(req_msg, 1197 alt_path->flow_label); 1198 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1199 req_msg->alt_traffic_class = alt_path->traffic_class; 1200 req_msg->alt_hop_limit = alt_path->hop_limit; 1201 cm_req_set_alt_sl(req_msg, alt_path->sl); 1202 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1203 cm_req_set_alt_local_ack_timeout(req_msg, 1204 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1205 alt_path->packet_life_time)); 1206 } 1207 1208 if (param->private_data && param->private_data_len) 1209 memcpy(req_msg->private_data, param->private_data, 1210 param->private_data_len); 1211 } 1212 1213 static int cm_validate_req_param(struct ib_cm_req_param *param) 1214 { 1215 /* peer-to-peer not supported */ 1216 if (param->peer_to_peer) 1217 return -EINVAL; 1218 1219 if (!param->primary_path) 1220 return -EINVAL; 1221 1222 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1223 param->qp_type != IB_QPT_XRC_INI) 1224 return -EINVAL; 1225 1226 if (param->private_data && 1227 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1228 return -EINVAL; 1229 1230 if (param->alternate_path && 1231 (param->alternate_path->pkey != param->primary_path->pkey || 1232 param->alternate_path->mtu != param->primary_path->mtu)) 1233 return -EINVAL; 1234 1235 return 0; 1236 } 1237 1238 int ib_send_cm_req(struct ib_cm_id *cm_id, 1239 struct ib_cm_req_param *param) 1240 { 1241 struct cm_id_private *cm_id_priv; 1242 struct cm_req_msg *req_msg; 1243 unsigned long flags; 1244 int ret; 1245 1246 ret = cm_validate_req_param(param); 1247 if (ret) 1248 return ret; 1249 1250 /* Verify that we're not in timewait. */ 1251 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1252 spin_lock_irqsave(&cm_id_priv->lock, flags); 1253 if (cm_id->state != IB_CM_IDLE) { 1254 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1255 ret = -EINVAL; 1256 goto out; 1257 } 1258 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1259 1260 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1261 id.local_id); 1262 if (IS_ERR(cm_id_priv->timewait_info)) { 1263 ret = PTR_ERR(cm_id_priv->timewait_info); 1264 goto out; 1265 } 1266 1267 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av, 1268 cm_id_priv); 1269 if (ret) 1270 goto error1; 1271 if (param->alternate_path) { 1272 ret = cm_init_av_by_path(param->alternate_path, 1273 &cm_id_priv->alt_av, cm_id_priv); 1274 if (ret) 1275 goto error1; 1276 } 1277 cm_id->service_id = param->service_id; 1278 cm_id->service_mask = ~cpu_to_be64(0); 1279 cm_id_priv->timeout_ms = cm_convert_to_ms( 1280 param->primary_path->packet_life_time) * 2 + 1281 cm_convert_to_ms( 1282 param->remote_cm_response_timeout); 1283 cm_id_priv->max_cm_retries = param->max_cm_retries; 1284 cm_id_priv->initiator_depth = param->initiator_depth; 1285 cm_id_priv->responder_resources = param->responder_resources; 1286 cm_id_priv->retry_count = param->retry_count; 1287 cm_id_priv->path_mtu = param->primary_path->mtu; 1288 cm_id_priv->pkey = param->primary_path->pkey; 1289 cm_id_priv->qp_type = param->qp_type; 1290 1291 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1292 if (ret) 1293 goto error1; 1294 1295 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1296 cm_format_req(req_msg, cm_id_priv, param); 1297 cm_id_priv->tid = req_msg->hdr.tid; 1298 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1299 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1300 1301 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1302 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1303 1304 spin_lock_irqsave(&cm_id_priv->lock, flags); 1305 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1306 if (ret) { 1307 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1308 goto error2; 1309 } 1310 BUG_ON(cm_id->state != IB_CM_IDLE); 1311 cm_id->state = IB_CM_REQ_SENT; 1312 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1313 return 0; 1314 1315 error2: cm_free_msg(cm_id_priv->msg); 1316 error1: kfree(cm_id_priv->timewait_info); 1317 out: return ret; 1318 } 1319 EXPORT_SYMBOL(ib_send_cm_req); 1320 1321 static int cm_issue_rej(struct cm_port *port, 1322 struct ib_mad_recv_wc *mad_recv_wc, 1323 enum ib_cm_rej_reason reason, 1324 enum cm_msg_response msg_rejected, 1325 void *ari, u8 ari_length) 1326 { 1327 struct ib_mad_send_buf *msg = NULL; 1328 struct cm_rej_msg *rej_msg, *rcv_msg; 1329 int ret; 1330 1331 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1332 if (ret) 1333 return ret; 1334 1335 /* We just need common CM header information. Cast to any message. */ 1336 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1337 rej_msg = (struct cm_rej_msg *) msg->mad; 1338 1339 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1340 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1341 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1342 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1343 rej_msg->reason = cpu_to_be16(reason); 1344 1345 if (ari && ari_length) { 1346 cm_rej_set_reject_info_len(rej_msg, ari_length); 1347 memcpy(rej_msg->ari, ari, ari_length); 1348 } 1349 1350 ret = ib_post_send_mad(msg, NULL); 1351 if (ret) 1352 cm_free_msg(msg); 1353 1354 return ret; 1355 } 1356 1357 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1358 struct ib_sa_path_rec *primary_path, 1359 struct ib_sa_path_rec *alt_path) 1360 { 1361 memset(primary_path, 0, sizeof *primary_path); 1362 primary_path->dgid = req_msg->primary_local_gid; 1363 primary_path->sgid = req_msg->primary_remote_gid; 1364 primary_path->dlid = req_msg->primary_local_lid; 1365 primary_path->slid = req_msg->primary_remote_lid; 1366 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1367 primary_path->hop_limit = req_msg->primary_hop_limit; 1368 primary_path->traffic_class = req_msg->primary_traffic_class; 1369 primary_path->reversible = 1; 1370 primary_path->pkey = req_msg->pkey; 1371 primary_path->sl = cm_req_get_primary_sl(req_msg); 1372 primary_path->mtu_selector = IB_SA_EQ; 1373 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1374 primary_path->rate_selector = IB_SA_EQ; 1375 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1376 primary_path->packet_life_time_selector = IB_SA_EQ; 1377 primary_path->packet_life_time = 1378 cm_req_get_primary_local_ack_timeout(req_msg); 1379 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1380 primary_path->service_id = req_msg->service_id; 1381 1382 if (req_msg->alt_local_lid) { 1383 memset(alt_path, 0, sizeof *alt_path); 1384 alt_path->dgid = req_msg->alt_local_gid; 1385 alt_path->sgid = req_msg->alt_remote_gid; 1386 alt_path->dlid = req_msg->alt_local_lid; 1387 alt_path->slid = req_msg->alt_remote_lid; 1388 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1389 alt_path->hop_limit = req_msg->alt_hop_limit; 1390 alt_path->traffic_class = req_msg->alt_traffic_class; 1391 alt_path->reversible = 1; 1392 alt_path->pkey = req_msg->pkey; 1393 alt_path->sl = cm_req_get_alt_sl(req_msg); 1394 alt_path->mtu_selector = IB_SA_EQ; 1395 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1396 alt_path->rate_selector = IB_SA_EQ; 1397 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1398 alt_path->packet_life_time_selector = IB_SA_EQ; 1399 alt_path->packet_life_time = 1400 cm_req_get_alt_local_ack_timeout(req_msg); 1401 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1402 alt_path->service_id = req_msg->service_id; 1403 } 1404 } 1405 1406 static u16 cm_get_bth_pkey(struct cm_work *work) 1407 { 1408 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1409 u8 port_num = work->port->port_num; 1410 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1411 u16 pkey; 1412 int ret; 1413 1414 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1415 if (ret) { 1416 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1417 port_num, pkey_index, ret); 1418 return 0; 1419 } 1420 1421 return pkey; 1422 } 1423 1424 static void cm_format_req_event(struct cm_work *work, 1425 struct cm_id_private *cm_id_priv, 1426 struct ib_cm_id *listen_id) 1427 { 1428 struct cm_req_msg *req_msg; 1429 struct ib_cm_req_event_param *param; 1430 1431 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1432 param = &work->cm_event.param.req_rcvd; 1433 param->listen_id = listen_id; 1434 param->bth_pkey = cm_get_bth_pkey(work); 1435 param->port = cm_id_priv->av.port->port_num; 1436 param->primary_path = &work->path[0]; 1437 if (req_msg->alt_local_lid) 1438 param->alternate_path = &work->path[1]; 1439 else 1440 param->alternate_path = NULL; 1441 param->remote_ca_guid = req_msg->local_ca_guid; 1442 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1443 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1444 param->qp_type = cm_req_get_qp_type(req_msg); 1445 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1446 param->responder_resources = cm_req_get_init_depth(req_msg); 1447 param->initiator_depth = cm_req_get_resp_res(req_msg); 1448 param->local_cm_response_timeout = 1449 cm_req_get_remote_resp_timeout(req_msg); 1450 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1451 param->remote_cm_response_timeout = 1452 cm_req_get_local_resp_timeout(req_msg); 1453 param->retry_count = cm_req_get_retry_count(req_msg); 1454 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1455 param->srq = cm_req_get_srq(req_msg); 1456 param->ppath_sgid_index = cm_id_priv->av.ah_attr.grh.sgid_index; 1457 work->cm_event.private_data = &req_msg->private_data; 1458 } 1459 1460 static void cm_process_work(struct cm_id_private *cm_id_priv, 1461 struct cm_work *work) 1462 { 1463 int ret; 1464 1465 /* We will typically only have the current event to report. */ 1466 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1467 cm_free_work(work); 1468 1469 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1470 spin_lock_irq(&cm_id_priv->lock); 1471 work = cm_dequeue_work(cm_id_priv); 1472 spin_unlock_irq(&cm_id_priv->lock); 1473 BUG_ON(!work); 1474 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1475 &work->cm_event); 1476 cm_free_work(work); 1477 } 1478 cm_deref_id(cm_id_priv); 1479 if (ret) 1480 cm_destroy_id(&cm_id_priv->id, ret); 1481 } 1482 1483 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1484 struct cm_id_private *cm_id_priv, 1485 enum cm_msg_response msg_mraed, u8 service_timeout, 1486 const void *private_data, u8 private_data_len) 1487 { 1488 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1489 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1490 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1491 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1492 cm_mra_set_service_timeout(mra_msg, service_timeout); 1493 1494 if (private_data && private_data_len) 1495 memcpy(mra_msg->private_data, private_data, private_data_len); 1496 } 1497 1498 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1499 struct cm_id_private *cm_id_priv, 1500 enum ib_cm_rej_reason reason, 1501 void *ari, 1502 u8 ari_length, 1503 const void *private_data, 1504 u8 private_data_len) 1505 { 1506 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1507 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1508 1509 switch(cm_id_priv->id.state) { 1510 case IB_CM_REQ_RCVD: 1511 rej_msg->local_comm_id = 0; 1512 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1513 break; 1514 case IB_CM_MRA_REQ_SENT: 1515 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1516 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1517 break; 1518 case IB_CM_REP_RCVD: 1519 case IB_CM_MRA_REP_SENT: 1520 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1521 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1522 break; 1523 default: 1524 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1525 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1526 break; 1527 } 1528 1529 rej_msg->reason = cpu_to_be16(reason); 1530 if (ari && ari_length) { 1531 cm_rej_set_reject_info_len(rej_msg, ari_length); 1532 memcpy(rej_msg->ari, ari, ari_length); 1533 } 1534 1535 if (private_data && private_data_len) 1536 memcpy(rej_msg->private_data, private_data, private_data_len); 1537 } 1538 1539 static void cm_dup_req_handler(struct cm_work *work, 1540 struct cm_id_private *cm_id_priv) 1541 { 1542 struct ib_mad_send_buf *msg = NULL; 1543 int ret; 1544 1545 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1546 counter[CM_REQ_COUNTER]); 1547 1548 /* Quick state check to discard duplicate REQs. */ 1549 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1550 return; 1551 1552 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1553 if (ret) 1554 return; 1555 1556 spin_lock_irq(&cm_id_priv->lock); 1557 switch (cm_id_priv->id.state) { 1558 case IB_CM_MRA_REQ_SENT: 1559 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1560 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1561 cm_id_priv->private_data, 1562 cm_id_priv->private_data_len); 1563 break; 1564 case IB_CM_TIMEWAIT: 1565 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1566 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1567 break; 1568 default: 1569 goto unlock; 1570 } 1571 spin_unlock_irq(&cm_id_priv->lock); 1572 1573 ret = ib_post_send_mad(msg, NULL); 1574 if (ret) 1575 goto free; 1576 return; 1577 1578 unlock: spin_unlock_irq(&cm_id_priv->lock); 1579 free: cm_free_msg(msg); 1580 } 1581 1582 static struct cm_id_private * cm_match_req(struct cm_work *work, 1583 struct cm_id_private *cm_id_priv) 1584 { 1585 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1586 struct cm_timewait_info *timewait_info; 1587 struct cm_req_msg *req_msg; 1588 1589 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1590 1591 /* Check for possible duplicate REQ. */ 1592 spin_lock_irq(&cm.lock); 1593 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1594 if (timewait_info) { 1595 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1596 timewait_info->work.remote_id); 1597 spin_unlock_irq(&cm.lock); 1598 if (cur_cm_id_priv) { 1599 cm_dup_req_handler(work, cur_cm_id_priv); 1600 cm_deref_id(cur_cm_id_priv); 1601 } 1602 return NULL; 1603 } 1604 1605 /* Check for stale connections. */ 1606 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1607 if (timewait_info) { 1608 cm_cleanup_timewait(cm_id_priv->timewait_info); 1609 spin_unlock_irq(&cm.lock); 1610 cm_issue_rej(work->port, work->mad_recv_wc, 1611 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1612 NULL, 0); 1613 return NULL; 1614 } 1615 1616 /* Find matching listen request. */ 1617 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1618 req_msg->service_id); 1619 if (!listen_cm_id_priv) { 1620 cm_cleanup_timewait(cm_id_priv->timewait_info); 1621 spin_unlock_irq(&cm.lock); 1622 cm_issue_rej(work->port, work->mad_recv_wc, 1623 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1624 NULL, 0); 1625 goto out; 1626 } 1627 atomic_inc(&listen_cm_id_priv->refcount); 1628 atomic_inc(&cm_id_priv->refcount); 1629 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1630 atomic_inc(&cm_id_priv->work_count); 1631 spin_unlock_irq(&cm.lock); 1632 out: 1633 return listen_cm_id_priv; 1634 } 1635 1636 /* 1637 * Work-around for inter-subnet connections. If the LIDs are permissive, 1638 * we need to override the LID/SL data in the REQ with the LID information 1639 * in the work completion. 1640 */ 1641 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1642 { 1643 if (!cm_req_get_primary_subnet_local(req_msg)) { 1644 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1645 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1646 cm_req_set_primary_sl(req_msg, wc->sl); 1647 } 1648 1649 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1650 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1651 } 1652 1653 if (!cm_req_get_alt_subnet_local(req_msg)) { 1654 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1655 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1656 cm_req_set_alt_sl(req_msg, wc->sl); 1657 } 1658 1659 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1660 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1661 } 1662 } 1663 1664 static int cm_req_handler(struct cm_work *work) 1665 { 1666 struct ib_cm_id *cm_id; 1667 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1668 struct cm_req_msg *req_msg; 1669 union ib_gid gid; 1670 struct ib_gid_attr gid_attr; 1671 int ret; 1672 1673 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1674 1675 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1676 if (IS_ERR(cm_id)) 1677 return PTR_ERR(cm_id); 1678 1679 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1680 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1681 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1682 work->mad_recv_wc->recv_buf.grh, 1683 &cm_id_priv->av); 1684 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1685 id.local_id); 1686 if (IS_ERR(cm_id_priv->timewait_info)) { 1687 ret = PTR_ERR(cm_id_priv->timewait_info); 1688 goto destroy; 1689 } 1690 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1691 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1692 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1693 1694 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1695 if (!listen_cm_id_priv) { 1696 ret = -EINVAL; 1697 kfree(cm_id_priv->timewait_info); 1698 goto destroy; 1699 } 1700 1701 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1702 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1703 cm_id_priv->id.service_id = req_msg->service_id; 1704 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1705 1706 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1707 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1708 1709 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN); 1710 work->path[0].hop_limit = cm_id_priv->av.ah_attr.grh.hop_limit; 1711 ret = ib_get_cached_gid(work->port->cm_dev->ib_device, 1712 work->port->port_num, 1713 cm_id_priv->av.ah_attr.grh.sgid_index, 1714 &gid, &gid_attr); 1715 if (!ret) { 1716 if (gid_attr.ndev) { 1717 work->path[0].ifindex = gid_attr.ndev->if_index; 1718 work->path[0].net = dev_net(gid_attr.ndev); 1719 dev_put(gid_attr.ndev); 1720 } 1721 work->path[0].gid_type = gid_attr.gid_type; 1722 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av, 1723 cm_id_priv); 1724 } 1725 if (ret) { 1726 int err = ib_get_cached_gid(work->port->cm_dev->ib_device, 1727 work->port->port_num, 0, 1728 &work->path[0].sgid, 1729 &gid_attr); 1730 if (!err && gid_attr.ndev) { 1731 work->path[0].ifindex = gid_attr.ndev->if_index; 1732 work->path[0].net = dev_net(gid_attr.ndev); 1733 dev_put(gid_attr.ndev); 1734 } 1735 work->path[0].gid_type = gid_attr.gid_type; 1736 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1737 &work->path[0].sgid, sizeof work->path[0].sgid, 1738 NULL, 0); 1739 goto rejected; 1740 } 1741 if (req_msg->alt_local_lid) { 1742 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av, 1743 cm_id_priv); 1744 if (ret) { 1745 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1746 &work->path[0].sgid, 1747 sizeof work->path[0].sgid, NULL, 0); 1748 goto rejected; 1749 } 1750 } 1751 cm_id_priv->tid = req_msg->hdr.tid; 1752 cm_id_priv->timeout_ms = cm_convert_to_ms( 1753 cm_req_get_local_resp_timeout(req_msg)); 1754 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1755 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1756 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1757 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1758 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1759 cm_id_priv->pkey = req_msg->pkey; 1760 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1761 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1762 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1763 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1764 1765 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1766 cm_process_work(cm_id_priv, work); 1767 cm_deref_id(listen_cm_id_priv); 1768 return 0; 1769 1770 rejected: 1771 atomic_dec(&cm_id_priv->refcount); 1772 cm_deref_id(listen_cm_id_priv); 1773 destroy: 1774 ib_destroy_cm_id(cm_id); 1775 return ret; 1776 } 1777 1778 static void cm_format_rep(struct cm_rep_msg *rep_msg, 1779 struct cm_id_private *cm_id_priv, 1780 struct ib_cm_rep_param *param) 1781 { 1782 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1783 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1784 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1785 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1786 rep_msg->resp_resources = param->responder_resources; 1787 cm_rep_set_target_ack_delay(rep_msg, 1788 cm_id_priv->av.port->cm_dev->ack_delay); 1789 cm_rep_set_failover(rep_msg, param->failover_accepted); 1790 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1791 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1792 1793 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1794 rep_msg->initiator_depth = param->initiator_depth; 1795 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1796 cm_rep_set_srq(rep_msg, param->srq); 1797 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1798 } else { 1799 cm_rep_set_srq(rep_msg, 1); 1800 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1801 } 1802 1803 if (param->private_data && param->private_data_len) 1804 memcpy(rep_msg->private_data, param->private_data, 1805 param->private_data_len); 1806 } 1807 1808 int ib_send_cm_rep(struct ib_cm_id *cm_id, 1809 struct ib_cm_rep_param *param) 1810 { 1811 struct cm_id_private *cm_id_priv; 1812 struct ib_mad_send_buf *msg; 1813 struct cm_rep_msg *rep_msg; 1814 unsigned long flags; 1815 int ret; 1816 1817 if (param->private_data && 1818 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1819 return -EINVAL; 1820 1821 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1822 spin_lock_irqsave(&cm_id_priv->lock, flags); 1823 if (cm_id->state != IB_CM_REQ_RCVD && 1824 cm_id->state != IB_CM_MRA_REQ_SENT) { 1825 ret = -EINVAL; 1826 goto out; 1827 } 1828 1829 ret = cm_alloc_msg(cm_id_priv, &msg); 1830 if (ret) 1831 goto out; 1832 1833 rep_msg = (struct cm_rep_msg *) msg->mad; 1834 cm_format_rep(rep_msg, cm_id_priv, param); 1835 msg->timeout_ms = cm_id_priv->timeout_ms; 1836 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1837 1838 ret = ib_post_send_mad(msg, NULL); 1839 if (ret) { 1840 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1841 cm_free_msg(msg); 1842 return ret; 1843 } 1844 1845 cm_id->state = IB_CM_REP_SENT; 1846 cm_id_priv->msg = msg; 1847 cm_id_priv->initiator_depth = param->initiator_depth; 1848 cm_id_priv->responder_resources = param->responder_resources; 1849 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1850 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1851 1852 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1853 return ret; 1854 } 1855 EXPORT_SYMBOL(ib_send_cm_rep); 1856 1857 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1858 struct cm_id_private *cm_id_priv, 1859 const void *private_data, 1860 u8 private_data_len) 1861 { 1862 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1863 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1864 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1865 1866 if (private_data && private_data_len) 1867 memcpy(rtu_msg->private_data, private_data, private_data_len); 1868 } 1869 1870 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1871 const void *private_data, 1872 u8 private_data_len) 1873 { 1874 struct cm_id_private *cm_id_priv; 1875 struct ib_mad_send_buf *msg; 1876 unsigned long flags; 1877 void *data; 1878 int ret; 1879 1880 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1881 return -EINVAL; 1882 1883 data = cm_copy_private_data(private_data, private_data_len); 1884 if (IS_ERR(data)) 1885 return PTR_ERR(data); 1886 1887 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1888 spin_lock_irqsave(&cm_id_priv->lock, flags); 1889 if (cm_id->state != IB_CM_REP_RCVD && 1890 cm_id->state != IB_CM_MRA_REP_SENT) { 1891 ret = -EINVAL; 1892 goto error; 1893 } 1894 1895 ret = cm_alloc_msg(cm_id_priv, &msg); 1896 if (ret) 1897 goto error; 1898 1899 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1900 private_data, private_data_len); 1901 1902 ret = ib_post_send_mad(msg, NULL); 1903 if (ret) { 1904 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1905 cm_free_msg(msg); 1906 kfree(data); 1907 return ret; 1908 } 1909 1910 cm_id->state = IB_CM_ESTABLISHED; 1911 cm_set_private_data(cm_id_priv, data, private_data_len); 1912 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1913 return 0; 1914 1915 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1916 kfree(data); 1917 return ret; 1918 } 1919 EXPORT_SYMBOL(ib_send_cm_rtu); 1920 1921 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1922 { 1923 struct cm_rep_msg *rep_msg; 1924 struct ib_cm_rep_event_param *param; 1925 1926 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1927 param = &work->cm_event.param.rep_rcvd; 1928 param->remote_ca_guid = rep_msg->local_ca_guid; 1929 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1930 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1931 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1932 param->responder_resources = rep_msg->initiator_depth; 1933 param->initiator_depth = rep_msg->resp_resources; 1934 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1935 param->failover_accepted = cm_rep_get_failover(rep_msg); 1936 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1937 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1938 param->srq = cm_rep_get_srq(rep_msg); 1939 work->cm_event.private_data = &rep_msg->private_data; 1940 } 1941 1942 static void cm_dup_rep_handler(struct cm_work *work) 1943 { 1944 struct cm_id_private *cm_id_priv; 1945 struct cm_rep_msg *rep_msg; 1946 struct ib_mad_send_buf *msg = NULL; 1947 int ret; 1948 1949 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1950 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1951 rep_msg->local_comm_id); 1952 if (!cm_id_priv) 1953 return; 1954 1955 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1956 counter[CM_REP_COUNTER]); 1957 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1958 if (ret) 1959 goto deref; 1960 1961 spin_lock_irq(&cm_id_priv->lock); 1962 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1963 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1964 cm_id_priv->private_data, 1965 cm_id_priv->private_data_len); 1966 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1967 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1968 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1969 cm_id_priv->private_data, 1970 cm_id_priv->private_data_len); 1971 else 1972 goto unlock; 1973 spin_unlock_irq(&cm_id_priv->lock); 1974 1975 ret = ib_post_send_mad(msg, NULL); 1976 if (ret) 1977 goto free; 1978 goto deref; 1979 1980 unlock: spin_unlock_irq(&cm_id_priv->lock); 1981 free: cm_free_msg(msg); 1982 deref: cm_deref_id(cm_id_priv); 1983 } 1984 1985 static int cm_rep_handler(struct cm_work *work) 1986 { 1987 struct cm_id_private *cm_id_priv; 1988 struct cm_rep_msg *rep_msg; 1989 int ret; 1990 1991 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1992 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1993 if (!cm_id_priv) { 1994 cm_dup_rep_handler(work); 1995 return -EINVAL; 1996 } 1997 1998 cm_format_rep_event(work, cm_id_priv->qp_type); 1999 2000 spin_lock_irq(&cm_id_priv->lock); 2001 switch (cm_id_priv->id.state) { 2002 case IB_CM_REQ_SENT: 2003 case IB_CM_MRA_REQ_RCVD: 2004 break; 2005 default: 2006 spin_unlock_irq(&cm_id_priv->lock); 2007 ret = -EINVAL; 2008 goto error; 2009 } 2010 2011 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 2012 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 2013 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2014 2015 spin_lock(&cm.lock); 2016 /* Check for duplicate REP. */ 2017 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2018 spin_unlock(&cm.lock); 2019 spin_unlock_irq(&cm_id_priv->lock); 2020 ret = -EINVAL; 2021 goto error; 2022 } 2023 /* Check for a stale connection. */ 2024 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 2025 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 2026 &cm.remote_id_table); 2027 cm_id_priv->timewait_info->inserted_remote_id = 0; 2028 spin_unlock(&cm.lock); 2029 spin_unlock_irq(&cm_id_priv->lock); 2030 cm_issue_rej(work->port, work->mad_recv_wc, 2031 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2032 NULL, 0); 2033 ret = -EINVAL; 2034 goto error; 2035 } 2036 spin_unlock(&cm.lock); 2037 2038 cm_id_priv->id.state = IB_CM_REP_RCVD; 2039 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 2040 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2041 cm_id_priv->initiator_depth = rep_msg->resp_resources; 2042 cm_id_priv->responder_resources = rep_msg->initiator_depth; 2043 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 2044 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 2045 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 2046 cm_id_priv->av.timeout = 2047 cm_ack_timeout(cm_id_priv->target_ack_delay, 2048 cm_id_priv->av.timeout - 1); 2049 cm_id_priv->alt_av.timeout = 2050 cm_ack_timeout(cm_id_priv->target_ack_delay, 2051 cm_id_priv->alt_av.timeout - 1); 2052 2053 /* todo: handle peer_to_peer */ 2054 2055 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2056 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2057 if (!ret) 2058 list_add_tail(&work->list, &cm_id_priv->work_list); 2059 spin_unlock_irq(&cm_id_priv->lock); 2060 2061 if (ret) 2062 cm_process_work(cm_id_priv, work); 2063 else 2064 cm_deref_id(cm_id_priv); 2065 return 0; 2066 2067 error: 2068 cm_deref_id(cm_id_priv); 2069 return ret; 2070 } 2071 2072 static int cm_establish_handler(struct cm_work *work) 2073 { 2074 struct cm_id_private *cm_id_priv; 2075 int ret; 2076 2077 /* See comment in cm_establish about lookup. */ 2078 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2079 if (!cm_id_priv) 2080 return -EINVAL; 2081 2082 spin_lock_irq(&cm_id_priv->lock); 2083 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2084 spin_unlock_irq(&cm_id_priv->lock); 2085 goto out; 2086 } 2087 2088 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2089 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2090 if (!ret) 2091 list_add_tail(&work->list, &cm_id_priv->work_list); 2092 spin_unlock_irq(&cm_id_priv->lock); 2093 2094 if (ret) 2095 cm_process_work(cm_id_priv, work); 2096 else 2097 cm_deref_id(cm_id_priv); 2098 return 0; 2099 out: 2100 cm_deref_id(cm_id_priv); 2101 return -EINVAL; 2102 } 2103 2104 static int cm_rtu_handler(struct cm_work *work) 2105 { 2106 struct cm_id_private *cm_id_priv; 2107 struct cm_rtu_msg *rtu_msg; 2108 int ret; 2109 2110 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2111 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 2112 rtu_msg->local_comm_id); 2113 if (!cm_id_priv) 2114 return -EINVAL; 2115 2116 work->cm_event.private_data = &rtu_msg->private_data; 2117 2118 spin_lock_irq(&cm_id_priv->lock); 2119 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2120 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2121 spin_unlock_irq(&cm_id_priv->lock); 2122 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2123 counter[CM_RTU_COUNTER]); 2124 goto out; 2125 } 2126 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2127 2128 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2129 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2130 if (!ret) 2131 list_add_tail(&work->list, &cm_id_priv->work_list); 2132 spin_unlock_irq(&cm_id_priv->lock); 2133 2134 if (ret) 2135 cm_process_work(cm_id_priv, work); 2136 else 2137 cm_deref_id(cm_id_priv); 2138 return 0; 2139 out: 2140 cm_deref_id(cm_id_priv); 2141 return -EINVAL; 2142 } 2143 2144 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2145 struct cm_id_private *cm_id_priv, 2146 const void *private_data, 2147 u8 private_data_len) 2148 { 2149 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2150 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 2151 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2152 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2153 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2154 2155 if (private_data && private_data_len) 2156 memcpy(dreq_msg->private_data, private_data, private_data_len); 2157 } 2158 2159 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2160 const void *private_data, 2161 u8 private_data_len) 2162 { 2163 struct cm_id_private *cm_id_priv; 2164 struct ib_mad_send_buf *msg; 2165 unsigned long flags; 2166 int ret; 2167 2168 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2169 return -EINVAL; 2170 2171 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2172 spin_lock_irqsave(&cm_id_priv->lock, flags); 2173 if (cm_id->state != IB_CM_ESTABLISHED) { 2174 ret = -EINVAL; 2175 goto out; 2176 } 2177 2178 if (cm_id->lap_state == IB_CM_LAP_SENT || 2179 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2180 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2181 2182 ret = cm_alloc_msg(cm_id_priv, &msg); 2183 if (ret) { 2184 cm_enter_timewait(cm_id_priv); 2185 goto out; 2186 } 2187 2188 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2189 private_data, private_data_len); 2190 msg->timeout_ms = cm_id_priv->timeout_ms; 2191 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2192 2193 ret = ib_post_send_mad(msg, NULL); 2194 if (ret) { 2195 cm_enter_timewait(cm_id_priv); 2196 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2197 cm_free_msg(msg); 2198 return ret; 2199 } 2200 2201 cm_id->state = IB_CM_DREQ_SENT; 2202 cm_id_priv->msg = msg; 2203 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2204 return ret; 2205 } 2206 EXPORT_SYMBOL(ib_send_cm_dreq); 2207 2208 static void cm_format_drep(struct cm_drep_msg *drep_msg, 2209 struct cm_id_private *cm_id_priv, 2210 const void *private_data, 2211 u8 private_data_len) 2212 { 2213 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2214 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2215 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2216 2217 if (private_data && private_data_len) 2218 memcpy(drep_msg->private_data, private_data, private_data_len); 2219 } 2220 2221 int ib_send_cm_drep(struct ib_cm_id *cm_id, 2222 const void *private_data, 2223 u8 private_data_len) 2224 { 2225 struct cm_id_private *cm_id_priv; 2226 struct ib_mad_send_buf *msg; 2227 unsigned long flags; 2228 void *data; 2229 int ret; 2230 2231 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2232 return -EINVAL; 2233 2234 data = cm_copy_private_data(private_data, private_data_len); 2235 if (IS_ERR(data)) 2236 return PTR_ERR(data); 2237 2238 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2239 spin_lock_irqsave(&cm_id_priv->lock, flags); 2240 if (cm_id->state != IB_CM_DREQ_RCVD) { 2241 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2242 kfree(data); 2243 return -EINVAL; 2244 } 2245 2246 cm_set_private_data(cm_id_priv, data, private_data_len); 2247 cm_enter_timewait(cm_id_priv); 2248 2249 ret = cm_alloc_msg(cm_id_priv, &msg); 2250 if (ret) 2251 goto out; 2252 2253 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2254 private_data, private_data_len); 2255 2256 ret = ib_post_send_mad(msg, NULL); 2257 if (ret) { 2258 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2259 cm_free_msg(msg); 2260 return ret; 2261 } 2262 2263 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2264 return ret; 2265 } 2266 EXPORT_SYMBOL(ib_send_cm_drep); 2267 2268 static int cm_issue_drep(struct cm_port *port, 2269 struct ib_mad_recv_wc *mad_recv_wc) 2270 { 2271 struct ib_mad_send_buf *msg = NULL; 2272 struct cm_dreq_msg *dreq_msg; 2273 struct cm_drep_msg *drep_msg; 2274 int ret; 2275 2276 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2277 if (ret) 2278 return ret; 2279 2280 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2281 drep_msg = (struct cm_drep_msg *) msg->mad; 2282 2283 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2284 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2285 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2286 2287 ret = ib_post_send_mad(msg, NULL); 2288 if (ret) 2289 cm_free_msg(msg); 2290 2291 return ret; 2292 } 2293 2294 static int cm_dreq_handler(struct cm_work *work) 2295 { 2296 struct cm_id_private *cm_id_priv; 2297 struct cm_dreq_msg *dreq_msg; 2298 struct ib_mad_send_buf *msg = NULL; 2299 int ret; 2300 2301 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2302 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2303 dreq_msg->local_comm_id); 2304 if (!cm_id_priv) { 2305 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2306 counter[CM_DREQ_COUNTER]); 2307 cm_issue_drep(work->port, work->mad_recv_wc); 2308 return -EINVAL; 2309 } 2310 2311 work->cm_event.private_data = &dreq_msg->private_data; 2312 2313 spin_lock_irq(&cm_id_priv->lock); 2314 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2315 goto unlock; 2316 2317 switch (cm_id_priv->id.state) { 2318 case IB_CM_REP_SENT: 2319 case IB_CM_DREQ_SENT: 2320 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2321 break; 2322 case IB_CM_ESTABLISHED: 2323 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2324 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2325 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2326 break; 2327 case IB_CM_MRA_REP_RCVD: 2328 break; 2329 case IB_CM_TIMEWAIT: 2330 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2331 counter[CM_DREQ_COUNTER]); 2332 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2333 goto unlock; 2334 2335 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2336 cm_id_priv->private_data, 2337 cm_id_priv->private_data_len); 2338 spin_unlock_irq(&cm_id_priv->lock); 2339 2340 if (ib_post_send_mad(msg, NULL)) 2341 cm_free_msg(msg); 2342 goto deref; 2343 case IB_CM_DREQ_RCVD: 2344 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2345 counter[CM_DREQ_COUNTER]); 2346 goto unlock; 2347 default: 2348 goto unlock; 2349 } 2350 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2351 cm_id_priv->tid = dreq_msg->hdr.tid; 2352 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2353 if (!ret) 2354 list_add_tail(&work->list, &cm_id_priv->work_list); 2355 spin_unlock_irq(&cm_id_priv->lock); 2356 2357 if (ret) 2358 cm_process_work(cm_id_priv, work); 2359 else 2360 cm_deref_id(cm_id_priv); 2361 return 0; 2362 2363 unlock: spin_unlock_irq(&cm_id_priv->lock); 2364 deref: cm_deref_id(cm_id_priv); 2365 return -EINVAL; 2366 } 2367 2368 static int cm_drep_handler(struct cm_work *work) 2369 { 2370 struct cm_id_private *cm_id_priv; 2371 struct cm_drep_msg *drep_msg; 2372 int ret; 2373 2374 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2375 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2376 drep_msg->local_comm_id); 2377 if (!cm_id_priv) 2378 return -EINVAL; 2379 2380 work->cm_event.private_data = &drep_msg->private_data; 2381 2382 spin_lock_irq(&cm_id_priv->lock); 2383 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2384 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2385 spin_unlock_irq(&cm_id_priv->lock); 2386 goto out; 2387 } 2388 cm_enter_timewait(cm_id_priv); 2389 2390 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2391 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2392 if (!ret) 2393 list_add_tail(&work->list, &cm_id_priv->work_list); 2394 spin_unlock_irq(&cm_id_priv->lock); 2395 2396 if (ret) 2397 cm_process_work(cm_id_priv, work); 2398 else 2399 cm_deref_id(cm_id_priv); 2400 return 0; 2401 out: 2402 cm_deref_id(cm_id_priv); 2403 return -EINVAL; 2404 } 2405 2406 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2407 enum ib_cm_rej_reason reason, 2408 void *ari, 2409 u8 ari_length, 2410 const void *private_data, 2411 u8 private_data_len) 2412 { 2413 struct cm_id_private *cm_id_priv; 2414 struct ib_mad_send_buf *msg; 2415 unsigned long flags; 2416 int ret; 2417 2418 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2419 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2420 return -EINVAL; 2421 2422 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2423 2424 spin_lock_irqsave(&cm_id_priv->lock, flags); 2425 switch (cm_id->state) { 2426 case IB_CM_REQ_SENT: 2427 case IB_CM_MRA_REQ_RCVD: 2428 case IB_CM_REQ_RCVD: 2429 case IB_CM_MRA_REQ_SENT: 2430 case IB_CM_REP_RCVD: 2431 case IB_CM_MRA_REP_SENT: 2432 ret = cm_alloc_msg(cm_id_priv, &msg); 2433 if (!ret) 2434 cm_format_rej((struct cm_rej_msg *) msg->mad, 2435 cm_id_priv, reason, ari, ari_length, 2436 private_data, private_data_len); 2437 2438 cm_reset_to_idle(cm_id_priv); 2439 break; 2440 case IB_CM_REP_SENT: 2441 case IB_CM_MRA_REP_RCVD: 2442 ret = cm_alloc_msg(cm_id_priv, &msg); 2443 if (!ret) 2444 cm_format_rej((struct cm_rej_msg *) msg->mad, 2445 cm_id_priv, reason, ari, ari_length, 2446 private_data, private_data_len); 2447 2448 cm_enter_timewait(cm_id_priv); 2449 break; 2450 default: 2451 ret = -EINVAL; 2452 goto out; 2453 } 2454 2455 if (ret) 2456 goto out; 2457 2458 ret = ib_post_send_mad(msg, NULL); 2459 if (ret) 2460 cm_free_msg(msg); 2461 2462 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2463 return ret; 2464 } 2465 EXPORT_SYMBOL(ib_send_cm_rej); 2466 2467 static void cm_format_rej_event(struct cm_work *work) 2468 { 2469 struct cm_rej_msg *rej_msg; 2470 struct ib_cm_rej_event_param *param; 2471 2472 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2473 param = &work->cm_event.param.rej_rcvd; 2474 param->ari = rej_msg->ari; 2475 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2476 param->reason = __be16_to_cpu(rej_msg->reason); 2477 work->cm_event.private_data = &rej_msg->private_data; 2478 } 2479 2480 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2481 { 2482 struct cm_timewait_info *timewait_info; 2483 struct cm_id_private *cm_id_priv; 2484 __be32 remote_id; 2485 2486 remote_id = rej_msg->local_comm_id; 2487 2488 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2489 spin_lock_irq(&cm.lock); 2490 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2491 remote_id); 2492 if (!timewait_info) { 2493 spin_unlock_irq(&cm.lock); 2494 return NULL; 2495 } 2496 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2497 (timewait_info->work.local_id ^ 2498 cm.random_id_operand)); 2499 if (cm_id_priv) { 2500 if (cm_id_priv->id.remote_id == remote_id) 2501 atomic_inc(&cm_id_priv->refcount); 2502 else 2503 cm_id_priv = NULL; 2504 } 2505 spin_unlock_irq(&cm.lock); 2506 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2507 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2508 else 2509 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2510 2511 return cm_id_priv; 2512 } 2513 2514 static int cm_rej_handler(struct cm_work *work) 2515 { 2516 struct cm_id_private *cm_id_priv; 2517 struct cm_rej_msg *rej_msg; 2518 int ret; 2519 2520 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2521 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2522 if (!cm_id_priv) 2523 return -EINVAL; 2524 2525 cm_format_rej_event(work); 2526 2527 spin_lock_irq(&cm_id_priv->lock); 2528 switch (cm_id_priv->id.state) { 2529 case IB_CM_REQ_SENT: 2530 case IB_CM_MRA_REQ_RCVD: 2531 case IB_CM_REP_SENT: 2532 case IB_CM_MRA_REP_RCVD: 2533 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2534 /* fall through */ 2535 case IB_CM_REQ_RCVD: 2536 case IB_CM_MRA_REQ_SENT: 2537 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2538 cm_enter_timewait(cm_id_priv); 2539 else 2540 cm_reset_to_idle(cm_id_priv); 2541 break; 2542 case IB_CM_DREQ_SENT: 2543 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2544 /* fall through */ 2545 case IB_CM_REP_RCVD: 2546 case IB_CM_MRA_REP_SENT: 2547 cm_enter_timewait(cm_id_priv); 2548 break; 2549 case IB_CM_ESTABLISHED: 2550 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2551 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2552 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2553 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2554 cm_id_priv->msg); 2555 cm_enter_timewait(cm_id_priv); 2556 break; 2557 } 2558 /* fall through */ 2559 default: 2560 spin_unlock_irq(&cm_id_priv->lock); 2561 ret = -EINVAL; 2562 goto out; 2563 } 2564 2565 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2566 if (!ret) 2567 list_add_tail(&work->list, &cm_id_priv->work_list); 2568 spin_unlock_irq(&cm_id_priv->lock); 2569 2570 if (ret) 2571 cm_process_work(cm_id_priv, work); 2572 else 2573 cm_deref_id(cm_id_priv); 2574 return 0; 2575 out: 2576 cm_deref_id(cm_id_priv); 2577 return -EINVAL; 2578 } 2579 2580 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2581 u8 service_timeout, 2582 const void *private_data, 2583 u8 private_data_len) 2584 { 2585 struct cm_id_private *cm_id_priv; 2586 struct ib_mad_send_buf *msg; 2587 enum ib_cm_state cm_state; 2588 enum ib_cm_lap_state lap_state; 2589 enum cm_msg_response msg_response; 2590 void *data; 2591 unsigned long flags; 2592 int ret; 2593 2594 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2595 return -EINVAL; 2596 2597 data = cm_copy_private_data(private_data, private_data_len); 2598 if (IS_ERR(data)) 2599 return PTR_ERR(data); 2600 2601 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2602 2603 spin_lock_irqsave(&cm_id_priv->lock, flags); 2604 switch(cm_id_priv->id.state) { 2605 case IB_CM_REQ_RCVD: 2606 cm_state = IB_CM_MRA_REQ_SENT; 2607 lap_state = cm_id->lap_state; 2608 msg_response = CM_MSG_RESPONSE_REQ; 2609 break; 2610 case IB_CM_REP_RCVD: 2611 cm_state = IB_CM_MRA_REP_SENT; 2612 lap_state = cm_id->lap_state; 2613 msg_response = CM_MSG_RESPONSE_REP; 2614 break; 2615 case IB_CM_ESTABLISHED: 2616 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2617 cm_state = cm_id->state; 2618 lap_state = IB_CM_MRA_LAP_SENT; 2619 msg_response = CM_MSG_RESPONSE_OTHER; 2620 break; 2621 } 2622 default: 2623 ret = -EINVAL; 2624 goto error1; 2625 } 2626 2627 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2628 ret = cm_alloc_msg(cm_id_priv, &msg); 2629 if (ret) 2630 goto error1; 2631 2632 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2633 msg_response, service_timeout, 2634 private_data, private_data_len); 2635 ret = ib_post_send_mad(msg, NULL); 2636 if (ret) 2637 goto error2; 2638 } 2639 2640 cm_id->state = cm_state; 2641 cm_id->lap_state = lap_state; 2642 cm_id_priv->service_timeout = service_timeout; 2643 cm_set_private_data(cm_id_priv, data, private_data_len); 2644 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2645 return 0; 2646 2647 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2648 kfree(data); 2649 return ret; 2650 2651 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2652 kfree(data); 2653 cm_free_msg(msg); 2654 return ret; 2655 } 2656 EXPORT_SYMBOL(ib_send_cm_mra); 2657 2658 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2659 { 2660 switch (cm_mra_get_msg_mraed(mra_msg)) { 2661 case CM_MSG_RESPONSE_REQ: 2662 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2663 case CM_MSG_RESPONSE_REP: 2664 case CM_MSG_RESPONSE_OTHER: 2665 return cm_acquire_id(mra_msg->remote_comm_id, 2666 mra_msg->local_comm_id); 2667 default: 2668 return NULL; 2669 } 2670 } 2671 2672 static int cm_mra_handler(struct cm_work *work) 2673 { 2674 struct cm_id_private *cm_id_priv; 2675 struct cm_mra_msg *mra_msg; 2676 int timeout, ret; 2677 2678 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2679 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2680 if (!cm_id_priv) 2681 return -EINVAL; 2682 2683 work->cm_event.private_data = &mra_msg->private_data; 2684 work->cm_event.param.mra_rcvd.service_timeout = 2685 cm_mra_get_service_timeout(mra_msg); 2686 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2687 cm_convert_to_ms(cm_id_priv->av.timeout); 2688 2689 spin_lock_irq(&cm_id_priv->lock); 2690 switch (cm_id_priv->id.state) { 2691 case IB_CM_REQ_SENT: 2692 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2693 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2694 cm_id_priv->msg, timeout)) 2695 goto out; 2696 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2697 break; 2698 case IB_CM_REP_SENT: 2699 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2700 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2701 cm_id_priv->msg, timeout)) 2702 goto out; 2703 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2704 break; 2705 case IB_CM_ESTABLISHED: 2706 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2707 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2708 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2709 cm_id_priv->msg, timeout)) { 2710 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2711 atomic_long_inc(&work->port-> 2712 counter_group[CM_RECV_DUPLICATES]. 2713 counter[CM_MRA_COUNTER]); 2714 goto out; 2715 } 2716 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2717 break; 2718 case IB_CM_MRA_REQ_RCVD: 2719 case IB_CM_MRA_REP_RCVD: 2720 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2721 counter[CM_MRA_COUNTER]); 2722 /* fall through */ 2723 default: 2724 goto out; 2725 } 2726 2727 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2728 cm_id_priv->id.state; 2729 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2730 if (!ret) 2731 list_add_tail(&work->list, &cm_id_priv->work_list); 2732 spin_unlock_irq(&cm_id_priv->lock); 2733 2734 if (ret) 2735 cm_process_work(cm_id_priv, work); 2736 else 2737 cm_deref_id(cm_id_priv); 2738 return 0; 2739 out: 2740 spin_unlock_irq(&cm_id_priv->lock); 2741 cm_deref_id(cm_id_priv); 2742 return -EINVAL; 2743 } 2744 2745 static void cm_format_lap(struct cm_lap_msg *lap_msg, 2746 struct cm_id_private *cm_id_priv, 2747 struct ib_sa_path_rec *alternate_path, 2748 const void *private_data, 2749 u8 private_data_len) 2750 { 2751 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2752 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2753 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2754 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2755 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2756 /* todo: need remote CM response timeout */ 2757 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2758 lap_msg->alt_local_lid = alternate_path->slid; 2759 lap_msg->alt_remote_lid = alternate_path->dlid; 2760 lap_msg->alt_local_gid = alternate_path->sgid; 2761 lap_msg->alt_remote_gid = alternate_path->dgid; 2762 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2763 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2764 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2765 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2766 cm_lap_set_sl(lap_msg, alternate_path->sl); 2767 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2768 cm_lap_set_local_ack_timeout(lap_msg, 2769 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2770 alternate_path->packet_life_time)); 2771 2772 if (private_data && private_data_len) 2773 memcpy(lap_msg->private_data, private_data, private_data_len); 2774 } 2775 2776 int ib_send_cm_lap(struct ib_cm_id *cm_id, 2777 struct ib_sa_path_rec *alternate_path, 2778 const void *private_data, 2779 u8 private_data_len) 2780 { 2781 struct cm_id_private *cm_id_priv; 2782 struct ib_mad_send_buf *msg; 2783 unsigned long flags; 2784 int ret; 2785 2786 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2787 return -EINVAL; 2788 2789 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2790 spin_lock_irqsave(&cm_id_priv->lock, flags); 2791 if (cm_id->state != IB_CM_ESTABLISHED || 2792 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2793 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2794 ret = -EINVAL; 2795 goto out; 2796 } 2797 2798 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av, 2799 cm_id_priv); 2800 if (ret) 2801 goto out; 2802 cm_id_priv->alt_av.timeout = 2803 cm_ack_timeout(cm_id_priv->target_ack_delay, 2804 cm_id_priv->alt_av.timeout - 1); 2805 2806 ret = cm_alloc_msg(cm_id_priv, &msg); 2807 if (ret) 2808 goto out; 2809 2810 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2811 alternate_path, private_data, private_data_len); 2812 msg->timeout_ms = cm_id_priv->timeout_ms; 2813 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2814 2815 ret = ib_post_send_mad(msg, NULL); 2816 if (ret) { 2817 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2818 cm_free_msg(msg); 2819 return ret; 2820 } 2821 2822 cm_id->lap_state = IB_CM_LAP_SENT; 2823 cm_id_priv->msg = msg; 2824 2825 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2826 return ret; 2827 } 2828 EXPORT_SYMBOL(ib_send_cm_lap); 2829 2830 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2831 struct ib_sa_path_rec *path, 2832 struct cm_lap_msg *lap_msg) 2833 { 2834 memset(path, 0, sizeof *path); 2835 path->dgid = lap_msg->alt_local_gid; 2836 path->sgid = lap_msg->alt_remote_gid; 2837 path->dlid = lap_msg->alt_local_lid; 2838 path->slid = lap_msg->alt_remote_lid; 2839 path->flow_label = cm_lap_get_flow_label(lap_msg); 2840 path->hop_limit = lap_msg->alt_hop_limit; 2841 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2842 path->reversible = 1; 2843 path->pkey = cm_id_priv->pkey; 2844 path->sl = cm_lap_get_sl(lap_msg); 2845 path->mtu_selector = IB_SA_EQ; 2846 path->mtu = cm_id_priv->path_mtu; 2847 path->rate_selector = IB_SA_EQ; 2848 path->rate = cm_lap_get_packet_rate(lap_msg); 2849 path->packet_life_time_selector = IB_SA_EQ; 2850 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2851 path->packet_life_time -= (path->packet_life_time > 0); 2852 } 2853 2854 static int cm_lap_handler(struct cm_work *work) 2855 { 2856 struct cm_id_private *cm_id_priv; 2857 struct cm_lap_msg *lap_msg; 2858 struct ib_cm_lap_event_param *param; 2859 struct ib_mad_send_buf *msg = NULL; 2860 int ret; 2861 2862 /* todo: verify LAP request and send reject APR if invalid. */ 2863 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2864 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2865 lap_msg->local_comm_id); 2866 if (!cm_id_priv) 2867 return -EINVAL; 2868 2869 param = &work->cm_event.param.lap_rcvd; 2870 param->alternate_path = &work->path[0]; 2871 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2872 work->cm_event.private_data = &lap_msg->private_data; 2873 2874 spin_lock_irq(&cm_id_priv->lock); 2875 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2876 goto unlock; 2877 2878 switch (cm_id_priv->id.lap_state) { 2879 case IB_CM_LAP_UNINIT: 2880 case IB_CM_LAP_IDLE: 2881 break; 2882 case IB_CM_MRA_LAP_SENT: 2883 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2884 counter[CM_LAP_COUNTER]); 2885 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2886 goto unlock; 2887 2888 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2889 CM_MSG_RESPONSE_OTHER, 2890 cm_id_priv->service_timeout, 2891 cm_id_priv->private_data, 2892 cm_id_priv->private_data_len); 2893 spin_unlock_irq(&cm_id_priv->lock); 2894 2895 if (ib_post_send_mad(msg, NULL)) 2896 cm_free_msg(msg); 2897 goto deref; 2898 case IB_CM_LAP_RCVD: 2899 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2900 counter[CM_LAP_COUNTER]); 2901 goto unlock; 2902 default: 2903 goto unlock; 2904 } 2905 2906 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2907 cm_id_priv->tid = lap_msg->hdr.tid; 2908 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2909 work->mad_recv_wc->recv_buf.grh, 2910 &cm_id_priv->av); 2911 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av, 2912 cm_id_priv); 2913 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2914 if (!ret) 2915 list_add_tail(&work->list, &cm_id_priv->work_list); 2916 spin_unlock_irq(&cm_id_priv->lock); 2917 2918 if (ret) 2919 cm_process_work(cm_id_priv, work); 2920 else 2921 cm_deref_id(cm_id_priv); 2922 return 0; 2923 2924 unlock: spin_unlock_irq(&cm_id_priv->lock); 2925 deref: cm_deref_id(cm_id_priv); 2926 return -EINVAL; 2927 } 2928 2929 static void cm_format_apr(struct cm_apr_msg *apr_msg, 2930 struct cm_id_private *cm_id_priv, 2931 enum ib_cm_apr_status status, 2932 void *info, 2933 u8 info_length, 2934 const void *private_data, 2935 u8 private_data_len) 2936 { 2937 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2938 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2939 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2940 apr_msg->ap_status = (u8) status; 2941 2942 if (info && info_length) { 2943 apr_msg->info_length = info_length; 2944 memcpy(apr_msg->info, info, info_length); 2945 } 2946 2947 if (private_data && private_data_len) 2948 memcpy(apr_msg->private_data, private_data, private_data_len); 2949 } 2950 2951 int ib_send_cm_apr(struct ib_cm_id *cm_id, 2952 enum ib_cm_apr_status status, 2953 void *info, 2954 u8 info_length, 2955 const void *private_data, 2956 u8 private_data_len) 2957 { 2958 struct cm_id_private *cm_id_priv; 2959 struct ib_mad_send_buf *msg; 2960 unsigned long flags; 2961 int ret; 2962 2963 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2964 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2965 return -EINVAL; 2966 2967 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2968 spin_lock_irqsave(&cm_id_priv->lock, flags); 2969 if (cm_id->state != IB_CM_ESTABLISHED || 2970 (cm_id->lap_state != IB_CM_LAP_RCVD && 2971 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2972 ret = -EINVAL; 2973 goto out; 2974 } 2975 2976 ret = cm_alloc_msg(cm_id_priv, &msg); 2977 if (ret) 2978 goto out; 2979 2980 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2981 info, info_length, private_data, private_data_len); 2982 ret = ib_post_send_mad(msg, NULL); 2983 if (ret) { 2984 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2985 cm_free_msg(msg); 2986 return ret; 2987 } 2988 2989 cm_id->lap_state = IB_CM_LAP_IDLE; 2990 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2991 return ret; 2992 } 2993 EXPORT_SYMBOL(ib_send_cm_apr); 2994 2995 static int cm_apr_handler(struct cm_work *work) 2996 { 2997 struct cm_id_private *cm_id_priv; 2998 struct cm_apr_msg *apr_msg; 2999 int ret; 3000 3001 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 3002 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 3003 apr_msg->local_comm_id); 3004 if (!cm_id_priv) 3005 return -EINVAL; /* Unmatched reply. */ 3006 3007 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 3008 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 3009 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 3010 work->cm_event.private_data = &apr_msg->private_data; 3011 3012 spin_lock_irq(&cm_id_priv->lock); 3013 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3014 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3015 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3016 spin_unlock_irq(&cm_id_priv->lock); 3017 goto out; 3018 } 3019 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3020 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3021 cm_id_priv->msg = NULL; 3022 3023 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3024 if (!ret) 3025 list_add_tail(&work->list, &cm_id_priv->work_list); 3026 spin_unlock_irq(&cm_id_priv->lock); 3027 3028 if (ret) 3029 cm_process_work(cm_id_priv, work); 3030 else 3031 cm_deref_id(cm_id_priv); 3032 return 0; 3033 out: 3034 cm_deref_id(cm_id_priv); 3035 return -EINVAL; 3036 } 3037 3038 static int cm_timewait_handler(struct cm_work *work) 3039 { 3040 struct cm_timewait_info *timewait_info; 3041 struct cm_id_private *cm_id_priv; 3042 int ret; 3043 3044 timewait_info = (struct cm_timewait_info *)work; 3045 spin_lock_irq(&cm.lock); 3046 list_del(&timewait_info->list); 3047 spin_unlock_irq(&cm.lock); 3048 3049 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3050 timewait_info->work.remote_id); 3051 if (!cm_id_priv) 3052 return -EINVAL; 3053 3054 spin_lock_irq(&cm_id_priv->lock); 3055 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3056 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3057 spin_unlock_irq(&cm_id_priv->lock); 3058 goto out; 3059 } 3060 cm_id_priv->id.state = IB_CM_IDLE; 3061 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3062 if (!ret) 3063 list_add_tail(&work->list, &cm_id_priv->work_list); 3064 spin_unlock_irq(&cm_id_priv->lock); 3065 3066 if (ret) 3067 cm_process_work(cm_id_priv, work); 3068 else 3069 cm_deref_id(cm_id_priv); 3070 return 0; 3071 out: 3072 cm_deref_id(cm_id_priv); 3073 return -EINVAL; 3074 } 3075 3076 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3077 struct cm_id_private *cm_id_priv, 3078 struct ib_cm_sidr_req_param *param) 3079 { 3080 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3081 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 3082 sidr_req_msg->request_id = cm_id_priv->id.local_id; 3083 sidr_req_msg->pkey = param->path->pkey; 3084 sidr_req_msg->service_id = param->service_id; 3085 3086 if (param->private_data && param->private_data_len) 3087 memcpy(sidr_req_msg->private_data, param->private_data, 3088 param->private_data_len); 3089 } 3090 3091 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3092 struct ib_cm_sidr_req_param *param) 3093 { 3094 struct cm_id_private *cm_id_priv; 3095 struct ib_mad_send_buf *msg; 3096 unsigned long flags; 3097 int ret; 3098 3099 if (!param->path || (param->private_data && 3100 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3101 return -EINVAL; 3102 3103 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3104 ret = cm_init_av_by_path(param->path, &cm_id_priv->av, cm_id_priv); 3105 if (ret) 3106 goto out; 3107 3108 cm_id->service_id = param->service_id; 3109 cm_id->service_mask = ~cpu_to_be64(0); 3110 cm_id_priv->timeout_ms = param->timeout_ms; 3111 cm_id_priv->max_cm_retries = param->max_cm_retries; 3112 ret = cm_alloc_msg(cm_id_priv, &msg); 3113 if (ret) 3114 goto out; 3115 3116 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3117 param); 3118 msg->timeout_ms = cm_id_priv->timeout_ms; 3119 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3120 3121 spin_lock_irqsave(&cm_id_priv->lock, flags); 3122 if (cm_id->state == IB_CM_IDLE) 3123 ret = ib_post_send_mad(msg, NULL); 3124 else 3125 ret = -EINVAL; 3126 3127 if (ret) { 3128 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3129 cm_free_msg(msg); 3130 goto out; 3131 } 3132 cm_id->state = IB_CM_SIDR_REQ_SENT; 3133 cm_id_priv->msg = msg; 3134 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3135 out: 3136 return ret; 3137 } 3138 EXPORT_SYMBOL(ib_send_cm_sidr_req); 3139 3140 static void cm_format_sidr_req_event(struct cm_work *work, 3141 const struct cm_id_private *rx_cm_id, 3142 struct ib_cm_id *listen_id) 3143 { 3144 struct cm_sidr_req_msg *sidr_req_msg; 3145 struct ib_cm_sidr_req_event_param *param; 3146 3147 sidr_req_msg = (struct cm_sidr_req_msg *) 3148 work->mad_recv_wc->recv_buf.mad; 3149 param = &work->cm_event.param.sidr_req_rcvd; 3150 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 3151 param->listen_id = listen_id; 3152 param->service_id = sidr_req_msg->service_id; 3153 param->bth_pkey = cm_get_bth_pkey(work); 3154 param->port = work->port->port_num; 3155 param->sgid_index = rx_cm_id->av.ah_attr.grh.sgid_index; 3156 work->cm_event.private_data = &sidr_req_msg->private_data; 3157 } 3158 3159 static int cm_sidr_req_handler(struct cm_work *work) 3160 { 3161 struct ib_cm_id *cm_id; 3162 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3163 struct cm_sidr_req_msg *sidr_req_msg; 3164 struct ib_wc *wc; 3165 3166 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3167 if (IS_ERR(cm_id)) 3168 return PTR_ERR(cm_id); 3169 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3170 3171 /* Record SGID/SLID and request ID for lookup. */ 3172 sidr_req_msg = (struct cm_sidr_req_msg *) 3173 work->mad_recv_wc->recv_buf.mad; 3174 wc = work->mad_recv_wc->wc; 3175 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3176 cm_id_priv->av.dgid.global.interface_id = 0; 3177 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3178 work->mad_recv_wc->recv_buf.grh, 3179 &cm_id_priv->av); 3180 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3181 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3182 atomic_inc(&cm_id_priv->work_count); 3183 3184 spin_lock_irq(&cm.lock); 3185 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3186 if (cur_cm_id_priv) { 3187 spin_unlock_irq(&cm.lock); 3188 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3189 counter[CM_SIDR_REQ_COUNTER]); 3190 goto out; /* Duplicate message. */ 3191 } 3192 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3193 cur_cm_id_priv = cm_find_listen(cm_id->device, 3194 sidr_req_msg->service_id); 3195 if (!cur_cm_id_priv) { 3196 spin_unlock_irq(&cm.lock); 3197 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3198 goto out; /* No match. */ 3199 } 3200 atomic_inc(&cur_cm_id_priv->refcount); 3201 atomic_inc(&cm_id_priv->refcount); 3202 spin_unlock_irq(&cm.lock); 3203 3204 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3205 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3206 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3207 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3208 3209 cm_format_sidr_req_event(work, cm_id_priv, &cur_cm_id_priv->id); 3210 cm_process_work(cm_id_priv, work); 3211 cm_deref_id(cur_cm_id_priv); 3212 return 0; 3213 out: 3214 ib_destroy_cm_id(&cm_id_priv->id); 3215 return -EINVAL; 3216 } 3217 3218 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3219 struct cm_id_private *cm_id_priv, 3220 struct ib_cm_sidr_rep_param *param) 3221 { 3222 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3223 cm_id_priv->tid); 3224 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3225 sidr_rep_msg->status = param->status; 3226 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3227 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3228 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3229 3230 if (param->info && param->info_length) 3231 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3232 3233 if (param->private_data && param->private_data_len) 3234 memcpy(sidr_rep_msg->private_data, param->private_data, 3235 param->private_data_len); 3236 } 3237 3238 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3239 struct ib_cm_sidr_rep_param *param) 3240 { 3241 struct cm_id_private *cm_id_priv; 3242 struct ib_mad_send_buf *msg; 3243 unsigned long flags; 3244 int ret; 3245 3246 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3247 (param->private_data && 3248 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3249 return -EINVAL; 3250 3251 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3252 spin_lock_irqsave(&cm_id_priv->lock, flags); 3253 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3254 ret = -EINVAL; 3255 goto error; 3256 } 3257 3258 ret = cm_alloc_msg(cm_id_priv, &msg); 3259 if (ret) 3260 goto error; 3261 3262 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3263 param); 3264 ret = ib_post_send_mad(msg, NULL); 3265 if (ret) { 3266 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3267 cm_free_msg(msg); 3268 return ret; 3269 } 3270 cm_id->state = IB_CM_IDLE; 3271 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3272 3273 spin_lock_irqsave(&cm.lock, flags); 3274 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3275 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3276 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3277 } 3278 spin_unlock_irqrestore(&cm.lock, flags); 3279 return 0; 3280 3281 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3282 return ret; 3283 } 3284 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3285 3286 static void cm_format_sidr_rep_event(struct cm_work *work) 3287 { 3288 struct cm_sidr_rep_msg *sidr_rep_msg; 3289 struct ib_cm_sidr_rep_event_param *param; 3290 3291 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3292 work->mad_recv_wc->recv_buf.mad; 3293 param = &work->cm_event.param.sidr_rep_rcvd; 3294 param->status = sidr_rep_msg->status; 3295 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3296 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3297 param->info = &sidr_rep_msg->info; 3298 param->info_len = sidr_rep_msg->info_length; 3299 work->cm_event.private_data = &sidr_rep_msg->private_data; 3300 } 3301 3302 static int cm_sidr_rep_handler(struct cm_work *work) 3303 { 3304 struct cm_sidr_rep_msg *sidr_rep_msg; 3305 struct cm_id_private *cm_id_priv; 3306 3307 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3308 work->mad_recv_wc->recv_buf.mad; 3309 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3310 if (!cm_id_priv) 3311 return -EINVAL; /* Unmatched reply. */ 3312 3313 spin_lock_irq(&cm_id_priv->lock); 3314 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3315 spin_unlock_irq(&cm_id_priv->lock); 3316 goto out; 3317 } 3318 cm_id_priv->id.state = IB_CM_IDLE; 3319 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3320 spin_unlock_irq(&cm_id_priv->lock); 3321 3322 cm_format_sidr_rep_event(work); 3323 cm_process_work(cm_id_priv, work); 3324 return 0; 3325 out: 3326 cm_deref_id(cm_id_priv); 3327 return -EINVAL; 3328 } 3329 3330 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3331 enum ib_wc_status wc_status) 3332 { 3333 struct cm_id_private *cm_id_priv; 3334 struct ib_cm_event cm_event; 3335 enum ib_cm_state state; 3336 int ret; 3337 3338 memset(&cm_event, 0, sizeof cm_event); 3339 cm_id_priv = msg->context[0]; 3340 3341 /* Discard old sends or ones without a response. */ 3342 spin_lock_irq(&cm_id_priv->lock); 3343 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3344 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3345 goto discard; 3346 3347 switch (state) { 3348 case IB_CM_REQ_SENT: 3349 case IB_CM_MRA_REQ_RCVD: 3350 cm_reset_to_idle(cm_id_priv); 3351 cm_event.event = IB_CM_REQ_ERROR; 3352 break; 3353 case IB_CM_REP_SENT: 3354 case IB_CM_MRA_REP_RCVD: 3355 cm_reset_to_idle(cm_id_priv); 3356 cm_event.event = IB_CM_REP_ERROR; 3357 break; 3358 case IB_CM_DREQ_SENT: 3359 cm_enter_timewait(cm_id_priv); 3360 cm_event.event = IB_CM_DREQ_ERROR; 3361 break; 3362 case IB_CM_SIDR_REQ_SENT: 3363 cm_id_priv->id.state = IB_CM_IDLE; 3364 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3365 break; 3366 default: 3367 goto discard; 3368 } 3369 spin_unlock_irq(&cm_id_priv->lock); 3370 cm_event.param.send_status = wc_status; 3371 3372 /* No other events can occur on the cm_id at this point. */ 3373 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3374 cm_free_msg(msg); 3375 if (ret) 3376 ib_destroy_cm_id(&cm_id_priv->id); 3377 return; 3378 discard: 3379 spin_unlock_irq(&cm_id_priv->lock); 3380 cm_free_msg(msg); 3381 } 3382 3383 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3384 struct ib_mad_send_wc *mad_send_wc) 3385 { 3386 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3387 struct cm_port *port; 3388 u16 attr_index; 3389 3390 port = mad_agent->context; 3391 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3392 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3393 3394 /* 3395 * If the send was in response to a received message (context[0] is not 3396 * set to a cm_id), and is not a REJ, then it is a send that was 3397 * manually retried. 3398 */ 3399 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3400 msg->retries = 1; 3401 3402 atomic_long_add(1 + msg->retries, 3403 &port->counter_group[CM_XMIT].counter[attr_index]); 3404 if (msg->retries) 3405 atomic_long_add(msg->retries, 3406 &port->counter_group[CM_XMIT_RETRIES]. 3407 counter[attr_index]); 3408 3409 switch (mad_send_wc->status) { 3410 case IB_WC_SUCCESS: 3411 case IB_WC_WR_FLUSH_ERR: 3412 cm_free_msg(msg); 3413 break; 3414 default: 3415 if (msg->context[0] && msg->context[1]) 3416 cm_process_send_error(msg, mad_send_wc->status); 3417 else 3418 cm_free_msg(msg); 3419 break; 3420 } 3421 } 3422 3423 static void cm_work_handler(struct work_struct *_work) 3424 { 3425 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3426 int ret; 3427 3428 switch (work->cm_event.event) { 3429 case IB_CM_REQ_RECEIVED: 3430 ret = cm_req_handler(work); 3431 break; 3432 case IB_CM_MRA_RECEIVED: 3433 ret = cm_mra_handler(work); 3434 break; 3435 case IB_CM_REJ_RECEIVED: 3436 ret = cm_rej_handler(work); 3437 break; 3438 case IB_CM_REP_RECEIVED: 3439 ret = cm_rep_handler(work); 3440 break; 3441 case IB_CM_RTU_RECEIVED: 3442 ret = cm_rtu_handler(work); 3443 break; 3444 case IB_CM_USER_ESTABLISHED: 3445 ret = cm_establish_handler(work); 3446 break; 3447 case IB_CM_DREQ_RECEIVED: 3448 ret = cm_dreq_handler(work); 3449 break; 3450 case IB_CM_DREP_RECEIVED: 3451 ret = cm_drep_handler(work); 3452 break; 3453 case IB_CM_SIDR_REQ_RECEIVED: 3454 ret = cm_sidr_req_handler(work); 3455 break; 3456 case IB_CM_SIDR_REP_RECEIVED: 3457 ret = cm_sidr_rep_handler(work); 3458 break; 3459 case IB_CM_LAP_RECEIVED: 3460 ret = cm_lap_handler(work); 3461 break; 3462 case IB_CM_APR_RECEIVED: 3463 ret = cm_apr_handler(work); 3464 break; 3465 case IB_CM_TIMEWAIT_EXIT: 3466 ret = cm_timewait_handler(work); 3467 break; 3468 default: 3469 ret = -EINVAL; 3470 break; 3471 } 3472 if (ret) 3473 cm_free_work(work); 3474 } 3475 3476 static int cm_establish(struct ib_cm_id *cm_id) 3477 { 3478 struct cm_id_private *cm_id_priv; 3479 struct cm_work *work; 3480 unsigned long flags; 3481 int ret = 0; 3482 struct cm_device *cm_dev; 3483 3484 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3485 if (!cm_dev) 3486 return -ENODEV; 3487 3488 work = kmalloc(sizeof *work, GFP_ATOMIC); 3489 if (!work) 3490 return -ENOMEM; 3491 3492 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3493 spin_lock_irqsave(&cm_id_priv->lock, flags); 3494 switch (cm_id->state) 3495 { 3496 case IB_CM_REP_SENT: 3497 case IB_CM_MRA_REP_RCVD: 3498 cm_id->state = IB_CM_ESTABLISHED; 3499 break; 3500 case IB_CM_ESTABLISHED: 3501 ret = -EISCONN; 3502 break; 3503 default: 3504 ret = -EINVAL; 3505 break; 3506 } 3507 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3508 3509 if (ret) { 3510 kfree(work); 3511 goto out; 3512 } 3513 3514 /* 3515 * The CM worker thread may try to destroy the cm_id before it 3516 * can execute this work item. To prevent potential deadlock, 3517 * we need to find the cm_id once we're in the context of the 3518 * worker thread, rather than holding a reference on it. 3519 */ 3520 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3521 work->local_id = cm_id->local_id; 3522 work->remote_id = cm_id->remote_id; 3523 work->mad_recv_wc = NULL; 3524 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3525 3526 /* Check if the device started its remove_one */ 3527 spin_lock_irqsave(&cm.lock, flags); 3528 if (!cm_dev->going_down) { 3529 queue_delayed_work(cm.wq, &work->work, 0); 3530 } else { 3531 kfree(work); 3532 ret = -ENODEV; 3533 } 3534 spin_unlock_irqrestore(&cm.lock, flags); 3535 3536 out: 3537 return ret; 3538 } 3539 3540 static int cm_migrate(struct ib_cm_id *cm_id) 3541 { 3542 struct cm_id_private *cm_id_priv; 3543 struct cm_av tmp_av; 3544 unsigned long flags; 3545 int tmp_send_port_not_ready; 3546 int ret = 0; 3547 3548 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3549 spin_lock_irqsave(&cm_id_priv->lock, flags); 3550 if (cm_id->state == IB_CM_ESTABLISHED && 3551 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3552 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3553 cm_id->lap_state = IB_CM_LAP_IDLE; 3554 /* Swap address vector */ 3555 tmp_av = cm_id_priv->av; 3556 cm_id_priv->av = cm_id_priv->alt_av; 3557 cm_id_priv->alt_av = tmp_av; 3558 /* Swap port send ready state */ 3559 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; 3560 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; 3561 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; 3562 } else 3563 ret = -EINVAL; 3564 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3565 3566 return ret; 3567 } 3568 3569 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3570 { 3571 int ret; 3572 3573 switch (event) { 3574 case IB_EVENT_COMM_EST: 3575 ret = cm_establish(cm_id); 3576 break; 3577 case IB_EVENT_PATH_MIG: 3578 ret = cm_migrate(cm_id); 3579 break; 3580 default: 3581 ret = -EINVAL; 3582 } 3583 return ret; 3584 } 3585 EXPORT_SYMBOL(ib_cm_notify); 3586 3587 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3588 struct ib_mad_send_buf *send_buf, 3589 struct ib_mad_recv_wc *mad_recv_wc) 3590 { 3591 struct cm_port *port = mad_agent->context; 3592 struct cm_work *work; 3593 enum ib_cm_event_type event; 3594 u16 attr_id; 3595 int paths = 0; 3596 int going_down = 0; 3597 3598 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3599 case CM_REQ_ATTR_ID: 3600 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3601 alt_local_lid != 0); 3602 event = IB_CM_REQ_RECEIVED; 3603 break; 3604 case CM_MRA_ATTR_ID: 3605 event = IB_CM_MRA_RECEIVED; 3606 break; 3607 case CM_REJ_ATTR_ID: 3608 event = IB_CM_REJ_RECEIVED; 3609 break; 3610 case CM_REP_ATTR_ID: 3611 event = IB_CM_REP_RECEIVED; 3612 break; 3613 case CM_RTU_ATTR_ID: 3614 event = IB_CM_RTU_RECEIVED; 3615 break; 3616 case CM_DREQ_ATTR_ID: 3617 event = IB_CM_DREQ_RECEIVED; 3618 break; 3619 case CM_DREP_ATTR_ID: 3620 event = IB_CM_DREP_RECEIVED; 3621 break; 3622 case CM_SIDR_REQ_ATTR_ID: 3623 event = IB_CM_SIDR_REQ_RECEIVED; 3624 break; 3625 case CM_SIDR_REP_ATTR_ID: 3626 event = IB_CM_SIDR_REP_RECEIVED; 3627 break; 3628 case CM_LAP_ATTR_ID: 3629 paths = 1; 3630 event = IB_CM_LAP_RECEIVED; 3631 break; 3632 case CM_APR_ATTR_ID: 3633 event = IB_CM_APR_RECEIVED; 3634 break; 3635 default: 3636 ib_free_recv_mad(mad_recv_wc); 3637 return; 3638 } 3639 3640 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3641 atomic_long_inc(&port->counter_group[CM_RECV]. 3642 counter[attr_id - CM_ATTR_ID_OFFSET]); 3643 3644 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3645 GFP_KERNEL); 3646 if (!work) { 3647 ib_free_recv_mad(mad_recv_wc); 3648 return; 3649 } 3650 3651 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3652 work->cm_event.event = event; 3653 work->mad_recv_wc = mad_recv_wc; 3654 work->port = port; 3655 3656 /* Check if the device started its remove_one */ 3657 spin_lock_irq(&cm.lock); 3658 if (!port->cm_dev->going_down) 3659 queue_delayed_work(cm.wq, &work->work, 0); 3660 else 3661 going_down = 1; 3662 spin_unlock_irq(&cm.lock); 3663 3664 if (going_down) { 3665 kfree(work); 3666 ib_free_recv_mad(mad_recv_wc); 3667 } 3668 } 3669 3670 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3671 struct ib_qp_attr *qp_attr, 3672 int *qp_attr_mask) 3673 { 3674 unsigned long flags; 3675 int ret; 3676 3677 spin_lock_irqsave(&cm_id_priv->lock, flags); 3678 switch (cm_id_priv->id.state) { 3679 case IB_CM_REQ_SENT: 3680 case IB_CM_MRA_REQ_RCVD: 3681 case IB_CM_REQ_RCVD: 3682 case IB_CM_MRA_REQ_SENT: 3683 case IB_CM_REP_RCVD: 3684 case IB_CM_MRA_REP_SENT: 3685 case IB_CM_REP_SENT: 3686 case IB_CM_MRA_REP_RCVD: 3687 case IB_CM_ESTABLISHED: 3688 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3689 IB_QP_PKEY_INDEX | IB_QP_PORT; 3690 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3691 if (cm_id_priv->responder_resources) 3692 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3693 IB_ACCESS_REMOTE_ATOMIC; 3694 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3695 qp_attr->port_num = cm_id_priv->av.port->port_num; 3696 ret = 0; 3697 break; 3698 default: 3699 ret = -EINVAL; 3700 break; 3701 } 3702 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3703 return ret; 3704 } 3705 3706 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3707 struct ib_qp_attr *qp_attr, 3708 int *qp_attr_mask) 3709 { 3710 unsigned long flags; 3711 int ret; 3712 3713 spin_lock_irqsave(&cm_id_priv->lock, flags); 3714 switch (cm_id_priv->id.state) { 3715 case IB_CM_REQ_RCVD: 3716 case IB_CM_MRA_REQ_SENT: 3717 case IB_CM_REP_RCVD: 3718 case IB_CM_MRA_REP_SENT: 3719 case IB_CM_REP_SENT: 3720 case IB_CM_MRA_REP_RCVD: 3721 case IB_CM_ESTABLISHED: 3722 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3723 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3724 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3725 qp_attr->path_mtu = cm_id_priv->path_mtu; 3726 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3727 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3728 if (cm_id_priv->qp_type == IB_QPT_RC || 3729 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3730 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3731 IB_QP_MIN_RNR_TIMER; 3732 qp_attr->max_dest_rd_atomic = 3733 cm_id_priv->responder_resources; 3734 qp_attr->min_rnr_timer = 0; 3735 } 3736 if (cm_id_priv->alt_av.ah_attr.dlid) { 3737 *qp_attr_mask |= IB_QP_ALT_PATH; 3738 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3739 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3740 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3741 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3742 } 3743 ret = 0; 3744 break; 3745 default: 3746 ret = -EINVAL; 3747 break; 3748 } 3749 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3750 return ret; 3751 } 3752 3753 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3754 struct ib_qp_attr *qp_attr, 3755 int *qp_attr_mask) 3756 { 3757 unsigned long flags; 3758 int ret; 3759 3760 spin_lock_irqsave(&cm_id_priv->lock, flags); 3761 switch (cm_id_priv->id.state) { 3762 /* Allow transition to RTS before sending REP */ 3763 case IB_CM_REQ_RCVD: 3764 case IB_CM_MRA_REQ_SENT: 3765 3766 case IB_CM_REP_RCVD: 3767 case IB_CM_MRA_REP_SENT: 3768 case IB_CM_REP_SENT: 3769 case IB_CM_MRA_REP_RCVD: 3770 case IB_CM_ESTABLISHED: 3771 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3772 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3773 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3774 switch (cm_id_priv->qp_type) { 3775 case IB_QPT_RC: 3776 case IB_QPT_XRC_INI: 3777 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3778 IB_QP_MAX_QP_RD_ATOMIC; 3779 qp_attr->retry_cnt = cm_id_priv->retry_count; 3780 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3781 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3782 /* fall through */ 3783 case IB_QPT_XRC_TGT: 3784 *qp_attr_mask |= IB_QP_TIMEOUT; 3785 qp_attr->timeout = cm_id_priv->av.timeout; 3786 break; 3787 default: 3788 break; 3789 } 3790 if (cm_id_priv->alt_av.ah_attr.dlid) { 3791 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3792 qp_attr->path_mig_state = IB_MIG_REARM; 3793 } 3794 } else { 3795 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3796 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3797 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3798 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3799 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3800 qp_attr->path_mig_state = IB_MIG_REARM; 3801 } 3802 ret = 0; 3803 break; 3804 default: 3805 ret = -EINVAL; 3806 break; 3807 } 3808 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3809 return ret; 3810 } 3811 3812 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3813 struct ib_qp_attr *qp_attr, 3814 int *qp_attr_mask) 3815 { 3816 struct cm_id_private *cm_id_priv; 3817 int ret; 3818 3819 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3820 switch (qp_attr->qp_state) { 3821 case IB_QPS_INIT: 3822 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3823 break; 3824 case IB_QPS_RTR: 3825 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3826 break; 3827 case IB_QPS_RTS: 3828 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3829 break; 3830 default: 3831 ret = -EINVAL; 3832 break; 3833 } 3834 return ret; 3835 } 3836 EXPORT_SYMBOL(ib_cm_init_qp_attr); 3837 3838 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3839 char *buf) 3840 { 3841 struct cm_counter_group *group; 3842 struct cm_counter_attribute *cm_attr; 3843 3844 group = container_of(obj, struct cm_counter_group, obj); 3845 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3846 3847 return sprintf(buf, "%ld\n", 3848 atomic_long_read(&group->counter[cm_attr->index])); 3849 } 3850 3851 static const struct sysfs_ops cm_counter_ops = { 3852 .show = cm_show_counter 3853 }; 3854 3855 static struct kobj_type cm_counter_obj_type = { 3856 .sysfs_ops = &cm_counter_ops, 3857 .default_attrs = cm_counter_default_attrs 3858 }; 3859 3860 static void cm_release_port_obj(struct kobject *obj) 3861 { 3862 struct cm_port *cm_port; 3863 3864 cm_port = container_of(obj, struct cm_port, port_obj); 3865 kfree(cm_port); 3866 } 3867 3868 static struct kobj_type cm_port_obj_type = { 3869 .release = cm_release_port_obj 3870 }; 3871 3872 static char *cm_devnode(struct device *dev, umode_t *mode) 3873 { 3874 if (mode) 3875 *mode = 0666; 3876 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3877 } 3878 3879 struct class cm_class = { 3880 .owner = THIS_MODULE, 3881 .name = "infiniband_cm", 3882 .devnode = cm_devnode, 3883 }; 3884 EXPORT_SYMBOL(cm_class); 3885 3886 static int cm_create_port_fs(struct cm_port *port) 3887 { 3888 int i, ret; 3889 3890 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3891 &port->cm_dev->device->kobj, 3892 "%d", port->port_num); 3893 if (ret) { 3894 kfree(port); 3895 return ret; 3896 } 3897 3898 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3899 ret = kobject_init_and_add(&port->counter_group[i].obj, 3900 &cm_counter_obj_type, 3901 &port->port_obj, 3902 "%s", counter_group_names[i]); 3903 if (ret) 3904 goto error; 3905 } 3906 3907 return 0; 3908 3909 error: 3910 while (i--) 3911 kobject_put(&port->counter_group[i].obj); 3912 kobject_put(&port->port_obj); 3913 return ret; 3914 3915 } 3916 3917 static void cm_remove_port_fs(struct cm_port *port) 3918 { 3919 int i; 3920 3921 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3922 kobject_put(&port->counter_group[i].obj); 3923 3924 kobject_put(&port->port_obj); 3925 } 3926 3927 static void cm_add_one(struct ib_device *ib_device) 3928 { 3929 struct cm_device *cm_dev; 3930 struct cm_port *port; 3931 struct ib_mad_reg_req reg_req = { 3932 .mgmt_class = IB_MGMT_CLASS_CM, 3933 .mgmt_class_version = IB_CM_CLASS_VERSION, 3934 }; 3935 struct ib_port_modify port_modify = { 3936 .set_port_cap_mask = IB_PORT_CM_SUP 3937 }; 3938 unsigned long flags; 3939 int ret; 3940 int count = 0; 3941 u8 i; 3942 3943 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3944 ib_device->phys_port_cnt, GFP_KERNEL); 3945 if (!cm_dev) 3946 return; 3947 3948 cm_dev->ib_device = ib_device; 3949 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 3950 cm_dev->going_down = 0; 3951 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3952 MKDEV(0, 0), NULL, 3953 "%s", ib_device->name); 3954 if (IS_ERR(cm_dev->device)) { 3955 kfree(cm_dev); 3956 return; 3957 } 3958 3959 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3960 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3961 if (!rdma_cap_ib_cm(ib_device, i)) 3962 continue; 3963 3964 port = kzalloc(sizeof *port, GFP_KERNEL); 3965 if (!port) 3966 goto error1; 3967 3968 cm_dev->port[i-1] = port; 3969 port->cm_dev = cm_dev; 3970 port->port_num = i; 3971 3972 INIT_LIST_HEAD(&port->cm_priv_prim_list); 3973 INIT_LIST_HEAD(&port->cm_priv_altr_list); 3974 3975 ret = cm_create_port_fs(port); 3976 if (ret) 3977 goto error1; 3978 3979 port->mad_agent = ib_register_mad_agent(ib_device, i, 3980 IB_QPT_GSI, 3981 ®_req, 3982 0, 3983 cm_send_handler, 3984 cm_recv_handler, 3985 port, 3986 0); 3987 if (IS_ERR(port->mad_agent)) 3988 goto error2; 3989 3990 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3991 if (ret) 3992 goto error3; 3993 3994 count++; 3995 } 3996 3997 if (!count) 3998 goto free; 3999 4000 ib_set_client_data(ib_device, &cm_client, cm_dev); 4001 4002 write_lock_irqsave(&cm.device_lock, flags); 4003 list_add_tail(&cm_dev->list, &cm.device_list); 4004 write_unlock_irqrestore(&cm.device_lock, flags); 4005 return; 4006 4007 error3: 4008 ib_unregister_mad_agent(port->mad_agent); 4009 error2: 4010 cm_remove_port_fs(port); 4011 error1: 4012 port_modify.set_port_cap_mask = 0; 4013 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4014 while (--i) { 4015 if (!rdma_cap_ib_cm(ib_device, i)) 4016 continue; 4017 4018 port = cm_dev->port[i-1]; 4019 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4020 ib_unregister_mad_agent(port->mad_agent); 4021 cm_remove_port_fs(port); 4022 } 4023 free: 4024 device_unregister(cm_dev->device); 4025 kfree(cm_dev); 4026 } 4027 4028 static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4029 { 4030 struct cm_device *cm_dev = client_data; 4031 struct cm_port *port; 4032 struct cm_id_private *cm_id_priv; 4033 struct ib_mad_agent *cur_mad_agent; 4034 struct ib_port_modify port_modify = { 4035 .clr_port_cap_mask = IB_PORT_CM_SUP 4036 }; 4037 unsigned long flags; 4038 int i; 4039 4040 if (!cm_dev) 4041 return; 4042 4043 write_lock_irqsave(&cm.device_lock, flags); 4044 list_del(&cm_dev->list); 4045 write_unlock_irqrestore(&cm.device_lock, flags); 4046 4047 spin_lock_irq(&cm.lock); 4048 cm_dev->going_down = 1; 4049 spin_unlock_irq(&cm.lock); 4050 4051 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4052 if (!rdma_cap_ib_cm(ib_device, i)) 4053 continue; 4054 4055 port = cm_dev->port[i-1]; 4056 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4057 /* Mark all the cm_id's as not valid */ 4058 spin_lock_irq(&cm.lock); 4059 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) 4060 cm_id_priv->altr_send_port_not_ready = 1; 4061 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) 4062 cm_id_priv->prim_send_port_not_ready = 1; 4063 spin_unlock_irq(&cm.lock); 4064 /* 4065 * We flush the queue here after the going_down set, this 4066 * verify that no new works will be queued in the recv handler, 4067 * after that we can call the unregister_mad_agent 4068 */ 4069 flush_workqueue(cm.wq); 4070 spin_lock_irq(&cm.state_lock); 4071 cur_mad_agent = port->mad_agent; 4072 port->mad_agent = NULL; 4073 spin_unlock_irq(&cm.state_lock); 4074 ib_unregister_mad_agent(cur_mad_agent); 4075 cm_remove_port_fs(port); 4076 } 4077 4078 device_unregister(cm_dev->device); 4079 kfree(cm_dev); 4080 } 4081 4082 static int __init ib_cm_init(void) 4083 { 4084 int ret; 4085 4086 memset(&cm, 0, sizeof cm); 4087 INIT_LIST_HEAD(&cm.device_list); 4088 rwlock_init(&cm.device_lock); 4089 spin_lock_init(&cm.lock); 4090 spin_lock_init(&cm.state_lock); 4091 cm.listen_service_table = RB_ROOT; 4092 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4093 cm.remote_id_table = RB_ROOT; 4094 cm.remote_qp_table = RB_ROOT; 4095 cm.remote_sidr_table = RB_ROOT; 4096 idr_init(&cm.local_id_table); 4097 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4098 INIT_LIST_HEAD(&cm.timewait_list); 4099 4100 ret = class_register(&cm_class); 4101 if (ret) { 4102 ret = -ENOMEM; 4103 goto error1; 4104 } 4105 4106 cm.wq = create_workqueue("ib_cm"); 4107 if (!cm.wq) { 4108 ret = -ENOMEM; 4109 goto error2; 4110 } 4111 4112 ret = ib_register_client(&cm_client); 4113 if (ret) 4114 goto error3; 4115 4116 return 0; 4117 error3: 4118 destroy_workqueue(cm.wq); 4119 error2: 4120 class_unregister(&cm_class); 4121 error1: 4122 idr_destroy(&cm.local_id_table); 4123 return ret; 4124 } 4125 4126 static void __exit ib_cm_cleanup(void) 4127 { 4128 struct cm_timewait_info *timewait_info, *tmp; 4129 4130 spin_lock_irq(&cm.lock); 4131 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4132 cancel_delayed_work(&timewait_info->work.work); 4133 spin_unlock_irq(&cm.lock); 4134 4135 ib_unregister_client(&cm_client); 4136 destroy_workqueue(cm.wq); 4137 4138 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4139 cancel_delayed_work_sync(&timewait_info->work.work); 4140 list_del(&timewait_info->list); 4141 kfree(timewait_info); 4142 } 4143 4144 class_unregister(&cm_class); 4145 idr_destroy(&cm.local_id_table); 4146 } 4147 4148 module_init_order(ib_cm_init, SI_ORDER_SECOND); 4149 module_exit_order(ib_cm_cleanup, SI_ORDER_FIRST); 4150 4151