ib_cm.c revision 331769
1/* 2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. 3 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36#include <linux/completion.h> 37#include <linux/dma-mapping.h> 38#include <linux/device.h> 39#include <linux/module.h> 40#include <linux/err.h> 41#include <linux/idr.h> 42#include <linux/interrupt.h> 43#include <linux/random.h> 44#include <linux/rbtree.h> 45#include <linux/spinlock.h> 46#include <linux/slab.h> 47#include <linux/sysfs.h> 48#include <linux/workqueue.h> 49#include <linux/kdev_t.h> 50#include <linux/etherdevice.h> 51 52#include <asm/atomic-long.h> 53 54#include <rdma/ib_cache.h> 55#include <rdma/ib_cm.h> 56#include "cm_msgs.h" 57 58MODULE_AUTHOR("Sean Hefty"); 59MODULE_DESCRIPTION("InfiniBand CM"); 60MODULE_LICENSE("Dual BSD/GPL"); 61 62static void cm_add_one(struct ib_device *device); 63static void cm_remove_one(struct ib_device *device, void *client_data); 64 65static struct ib_client cm_client = { 66 .name = "cm", 67 .add = cm_add_one, 68 .remove = cm_remove_one 69}; 70 71static struct ib_cm { 72 spinlock_t lock; 73 struct list_head device_list; 74 rwlock_t device_lock; 75 struct rb_root listen_service_table; 76 u64 listen_service_id; 77 /* struct rb_root peer_service_table; todo: fix peer to peer */ 78 struct rb_root remote_qp_table; 79 struct rb_root remote_id_table; 80 struct rb_root remote_sidr_table; 81 struct idr local_id_table; 82 __be32 random_id_operand; 83 struct list_head timewait_list; 84 struct workqueue_struct *wq; 85 /* Sync on cm change port state */ 86 spinlock_t state_lock; 87} cm; 88 89/* Counter indexes ordered by attribute ID */ 90enum { 91 CM_REQ_COUNTER, 92 CM_MRA_COUNTER, 93 CM_REJ_COUNTER, 94 CM_REP_COUNTER, 95 CM_RTU_COUNTER, 96 CM_DREQ_COUNTER, 97 CM_DREP_COUNTER, 98 CM_SIDR_REQ_COUNTER, 99 CM_SIDR_REP_COUNTER, 100 CM_LAP_COUNTER, 101 CM_APR_COUNTER, 102 CM_ATTR_COUNT, 103 CM_ATTR_ID_OFFSET = 0x0010, 104}; 105 106enum { 107 CM_XMIT, 108 CM_XMIT_RETRIES, 109 CM_RECV, 110 CM_RECV_DUPLICATES, 111 CM_COUNTER_GROUPS 112}; 113 114static char const counter_group_names[CM_COUNTER_GROUPS] 115 [sizeof("cm_rx_duplicates")] = { 116 "cm_tx_msgs", "cm_tx_retries", 117 "cm_rx_msgs", "cm_rx_duplicates" 118}; 119 120struct cm_counter_group { 121 struct kobject obj; 122 atomic_long_t counter[CM_ATTR_COUNT]; 123}; 124 125struct cm_counter_attribute { 126 struct attribute attr; 127 int index; 128}; 129 130#define CM_COUNTER_ATTR(_name, _index) \ 131struct cm_counter_attribute cm_##_name##_counter_attr = { \ 132 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 133 .index = _index \ 134} 135 136static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 137static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 138static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 139static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 140static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 141static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 142static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 143static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 144static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 145static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 146static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 147 148static struct attribute *cm_counter_default_attrs[] = { 149 &cm_req_counter_attr.attr, 150 &cm_mra_counter_attr.attr, 151 &cm_rej_counter_attr.attr, 152 &cm_rep_counter_attr.attr, 153 &cm_rtu_counter_attr.attr, 154 &cm_dreq_counter_attr.attr, 155 &cm_drep_counter_attr.attr, 156 &cm_sidr_req_counter_attr.attr, 157 &cm_sidr_rep_counter_attr.attr, 158 &cm_lap_counter_attr.attr, 159 &cm_apr_counter_attr.attr, 160 NULL 161}; 162 163struct cm_port { 164 struct cm_device *cm_dev; 165 struct ib_mad_agent *mad_agent; 166 struct kobject port_obj; 167 u8 port_num; 168 struct list_head cm_priv_prim_list; 169 struct list_head cm_priv_altr_list; 170 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 171}; 172 173struct cm_device { 174 struct list_head list; 175 struct ib_device *ib_device; 176 struct device *device; 177 u8 ack_delay; 178 int going_down; 179 struct cm_port *port[0]; 180}; 181 182struct cm_av { 183 struct cm_port *port; 184 union ib_gid dgid; 185 struct ib_ah_attr ah_attr; 186 u16 pkey_index; 187 u8 timeout; 188}; 189 190struct cm_work { 191 struct delayed_work work; 192 struct list_head list; 193 struct cm_port *port; 194 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 195 __be32 local_id; /* Established / timewait */ 196 __be32 remote_id; 197 struct ib_cm_event cm_event; 198 struct ib_sa_path_rec path[0]; 199}; 200 201struct cm_timewait_info { 202 struct cm_work work; /* Must be first. */ 203 struct list_head list; 204 struct rb_node remote_qp_node; 205 struct rb_node remote_id_node; 206 __be64 remote_ca_guid; 207 __be32 remote_qpn; 208 u8 inserted_remote_qp; 209 u8 inserted_remote_id; 210}; 211 212struct cm_id_private { 213 struct ib_cm_id id; 214 215 struct rb_node service_node; 216 struct rb_node sidr_id_node; 217 spinlock_t lock; /* Do not acquire inside cm.lock */ 218 struct completion comp; 219 atomic_t refcount; 220 /* Number of clients sharing this ib_cm_id. Only valid for listeners. 221 * Protected by the cm.lock spinlock. */ 222 int listen_sharecount; 223 224 struct ib_mad_send_buf *msg; 225 struct cm_timewait_info *timewait_info; 226 /* todo: use alternate port on send failure */ 227 struct cm_av av; 228 struct cm_av alt_av; 229 230 void *private_data; 231 __be64 tid; 232 __be32 local_qpn; 233 __be32 remote_qpn; 234 enum ib_qp_type qp_type; 235 __be32 sq_psn; 236 __be32 rq_psn; 237 int timeout_ms; 238 enum ib_mtu path_mtu; 239 __be16 pkey; 240 u8 private_data_len; 241 u8 max_cm_retries; 242 u8 peer_to_peer; 243 u8 responder_resources; 244 u8 initiator_depth; 245 u8 retry_count; 246 u8 rnr_retry_count; 247 u8 service_timeout; 248 u8 target_ack_delay; 249 250 struct list_head prim_list; 251 struct list_head altr_list; 252 /* Indicates that the send port mad is registered and av is set */ 253 int prim_send_port_not_ready; 254 int altr_send_port_not_ready; 255 256 struct list_head work_list; 257 atomic_t work_count; 258}; 259 260static void cm_work_handler(struct work_struct *work); 261 262static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 263{ 264 if (atomic_dec_and_test(&cm_id_priv->refcount)) 265 complete(&cm_id_priv->comp); 266} 267 268static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 269 struct ib_mad_send_buf **msg) 270{ 271 struct ib_mad_agent *mad_agent; 272 struct ib_mad_send_buf *m; 273 struct ib_ah *ah; 274 struct cm_av *av; 275 unsigned long flags, flags2; 276 int ret = 0; 277 278 /* don't let the port to be released till the agent is down */ 279 spin_lock_irqsave(&cm.state_lock, flags2); 280 spin_lock_irqsave(&cm.lock, flags); 281 if (!cm_id_priv->prim_send_port_not_ready) 282 av = &cm_id_priv->av; 283 else if (!cm_id_priv->altr_send_port_not_ready && 284 (cm_id_priv->alt_av.port)) 285 av = &cm_id_priv->alt_av; 286 else { 287 pr_info("%s: not valid CM id\n", __func__); 288 ret = -ENODEV; 289 spin_unlock_irqrestore(&cm.lock, flags); 290 goto out; 291 } 292 spin_unlock_irqrestore(&cm.lock, flags); 293 /* Make sure the port haven't released the mad yet */ 294 mad_agent = cm_id_priv->av.port->mad_agent; 295 if (!mad_agent) { 296 pr_info("%s: not a valid MAD agent\n", __func__); 297 ret = -ENODEV; 298 goto out; 299 } 300 ah = ib_create_ah(mad_agent->qp->pd, &av->ah_attr); 301 if (IS_ERR(ah)) { 302 ret = PTR_ERR(ah); 303 goto out; 304 } 305 306 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 307 av->pkey_index, 308 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 309 GFP_ATOMIC, 310 IB_MGMT_BASE_VERSION); 311 if (IS_ERR(m)) { 312 ib_destroy_ah(ah); 313 ret = PTR_ERR(m); 314 goto out; 315 } 316 317 /* Timeout set by caller if response is expected. */ 318 m->ah = ah; 319 m->retries = cm_id_priv->max_cm_retries; 320 321 atomic_inc(&cm_id_priv->refcount); 322 m->context[0] = cm_id_priv; 323 *msg = m; 324 325out: 326 spin_unlock_irqrestore(&cm.state_lock, flags2); 327 return ret; 328} 329 330static int cm_alloc_response_msg(struct cm_port *port, 331 struct ib_mad_recv_wc *mad_recv_wc, 332 struct ib_mad_send_buf **msg) 333{ 334 struct ib_mad_send_buf *m; 335 struct ib_ah *ah; 336 337 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 338 mad_recv_wc->recv_buf.grh, port->port_num); 339 if (IS_ERR(ah)) 340 return PTR_ERR(ah); 341 342 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 343 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 344 GFP_ATOMIC, 345 IB_MGMT_BASE_VERSION); 346 if (IS_ERR(m)) { 347 ib_destroy_ah(ah); 348 return PTR_ERR(m); 349 } 350 m->ah = ah; 351 *msg = m; 352 return 0; 353} 354 355static void cm_free_msg(struct ib_mad_send_buf *msg) 356{ 357 ib_destroy_ah(msg->ah); 358 if (msg->context[0]) 359 cm_deref_id(msg->context[0]); 360 ib_free_send_mad(msg); 361} 362 363static void * cm_copy_private_data(const void *private_data, 364 u8 private_data_len) 365{ 366 void *data; 367 368 if (!private_data || !private_data_len) 369 return NULL; 370 371 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 372 if (!data) 373 return ERR_PTR(-ENOMEM); 374 375 return data; 376} 377 378static void cm_set_private_data(struct cm_id_private *cm_id_priv, 379 void *private_data, u8 private_data_len) 380{ 381 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 382 kfree(cm_id_priv->private_data); 383 384 cm_id_priv->private_data = private_data; 385 cm_id_priv->private_data_len = private_data_len; 386} 387 388static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 389 struct ib_grh *grh, struct cm_av *av) 390{ 391 av->port = port; 392 av->pkey_index = wc->pkey_index; 393 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 394 grh, &av->ah_attr); 395} 396 397static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av, 398 struct cm_id_private *cm_id_priv) 399{ 400 struct cm_device *cm_dev; 401 struct cm_port *port = NULL; 402 unsigned long flags; 403 int ret; 404 u8 p; 405 struct net_device *ndev = ib_get_ndev_from_path(path); 406 407 read_lock_irqsave(&cm.device_lock, flags); 408 list_for_each_entry(cm_dev, &cm.device_list, list) { 409 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 410 path->gid_type, ndev, &p, NULL)) { 411 port = cm_dev->port[p-1]; 412 break; 413 } 414 } 415 read_unlock_irqrestore(&cm.device_lock, flags); 416 417 if (ndev) 418 dev_put(ndev); 419 420 if (!port) 421 return -EINVAL; 422 423 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 424 be16_to_cpu(path->pkey), &av->pkey_index); 425 if (ret) 426 return ret; 427 428 av->port = port; 429 ret = ib_init_ah_from_path(cm_dev->ib_device, port->port_num, 430 path, &av->ah_attr); 431 if (ret) 432 return ret; 433 434 av->timeout = path->packet_life_time + 1; 435 436 spin_lock_irqsave(&cm.lock, flags); 437 if (&cm_id_priv->av == av) 438 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list); 439 else if (&cm_id_priv->alt_av == av) 440 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list); 441 else 442 ret = -EINVAL; 443 444 spin_unlock_irqrestore(&cm.lock, flags); 445 446 return ret; 447} 448 449static int cm_alloc_id(struct cm_id_private *cm_id_priv) 450{ 451 unsigned long flags; 452 int id; 453 454 idr_preload(GFP_KERNEL); 455 spin_lock_irqsave(&cm.lock, flags); 456 457 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT); 458 459 spin_unlock_irqrestore(&cm.lock, flags); 460 idr_preload_end(); 461 462 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 463 return id < 0 ? id : 0; 464} 465 466static void cm_free_id(__be32 local_id) 467{ 468 spin_lock_irq(&cm.lock); 469 idr_remove(&cm.local_id_table, 470 (__force int) (local_id ^ cm.random_id_operand)); 471 spin_unlock_irq(&cm.lock); 472} 473 474static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 475{ 476 struct cm_id_private *cm_id_priv; 477 478 cm_id_priv = idr_find(&cm.local_id_table, 479 (__force int) (local_id ^ cm.random_id_operand)); 480 if (cm_id_priv) { 481 if (cm_id_priv->id.remote_id == remote_id) 482 atomic_inc(&cm_id_priv->refcount); 483 else 484 cm_id_priv = NULL; 485 } 486 487 return cm_id_priv; 488} 489 490static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 491{ 492 struct cm_id_private *cm_id_priv; 493 494 spin_lock_irq(&cm.lock); 495 cm_id_priv = cm_get_id(local_id, remote_id); 496 spin_unlock_irq(&cm.lock); 497 498 return cm_id_priv; 499} 500 501/* 502 * Trivial helpers to strip endian annotation and compare; the 503 * endianness doesn't actually matter since we just need a stable 504 * order for the RB tree. 505 */ 506static int be32_lt(__be32 a, __be32 b) 507{ 508 return (__force u32) a < (__force u32) b; 509} 510 511static int be32_gt(__be32 a, __be32 b) 512{ 513 return (__force u32) a > (__force u32) b; 514} 515 516static int be64_lt(__be64 a, __be64 b) 517{ 518 return (__force u64) a < (__force u64) b; 519} 520 521static int be64_gt(__be64 a, __be64 b) 522{ 523 return (__force u64) a > (__force u64) b; 524} 525 526static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 527{ 528 struct rb_node **link = &cm.listen_service_table.rb_node; 529 struct rb_node *parent = NULL; 530 struct cm_id_private *cur_cm_id_priv; 531 __be64 service_id = cm_id_priv->id.service_id; 532 __be64 service_mask = cm_id_priv->id.service_mask; 533 534 while (*link) { 535 parent = *link; 536 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 537 service_node); 538 if ((cur_cm_id_priv->id.service_mask & service_id) == 539 (service_mask & cur_cm_id_priv->id.service_id) && 540 (cm_id_priv->id.device == cur_cm_id_priv->id.device)) 541 return cur_cm_id_priv; 542 543 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 544 link = &(*link)->rb_left; 545 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 546 link = &(*link)->rb_right; 547 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 548 link = &(*link)->rb_left; 549 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 550 link = &(*link)->rb_right; 551 else 552 link = &(*link)->rb_right; 553 } 554 rb_link_node(&cm_id_priv->service_node, parent, link); 555 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 556 return NULL; 557} 558 559static struct cm_id_private * cm_find_listen(struct ib_device *device, 560 __be64 service_id) 561{ 562 struct rb_node *node = cm.listen_service_table.rb_node; 563 struct cm_id_private *cm_id_priv; 564 565 while (node) { 566 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 567 if ((cm_id_priv->id.service_mask & service_id) == 568 cm_id_priv->id.service_id && 569 (cm_id_priv->id.device == device)) 570 return cm_id_priv; 571 572 if (device < cm_id_priv->id.device) 573 node = node->rb_left; 574 else if (device > cm_id_priv->id.device) 575 node = node->rb_right; 576 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 577 node = node->rb_left; 578 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 579 node = node->rb_right; 580 else 581 node = node->rb_right; 582 } 583 return NULL; 584} 585 586static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 587 *timewait_info) 588{ 589 struct rb_node **link = &cm.remote_id_table.rb_node; 590 struct rb_node *parent = NULL; 591 struct cm_timewait_info *cur_timewait_info; 592 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 593 __be32 remote_id = timewait_info->work.remote_id; 594 595 while (*link) { 596 parent = *link; 597 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 598 remote_id_node); 599 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 600 link = &(*link)->rb_left; 601 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 602 link = &(*link)->rb_right; 603 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 604 link = &(*link)->rb_left; 605 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 606 link = &(*link)->rb_right; 607 else 608 return cur_timewait_info; 609 } 610 timewait_info->inserted_remote_id = 1; 611 rb_link_node(&timewait_info->remote_id_node, parent, link); 612 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 613 return NULL; 614} 615 616static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 617 __be32 remote_id) 618{ 619 struct rb_node *node = cm.remote_id_table.rb_node; 620 struct cm_timewait_info *timewait_info; 621 622 while (node) { 623 timewait_info = rb_entry(node, struct cm_timewait_info, 624 remote_id_node); 625 if (be32_lt(remote_id, timewait_info->work.remote_id)) 626 node = node->rb_left; 627 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 628 node = node->rb_right; 629 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 630 node = node->rb_left; 631 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 632 node = node->rb_right; 633 else 634 return timewait_info; 635 } 636 return NULL; 637} 638 639static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 640 *timewait_info) 641{ 642 struct rb_node **link = &cm.remote_qp_table.rb_node; 643 struct rb_node *parent = NULL; 644 struct cm_timewait_info *cur_timewait_info; 645 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 646 __be32 remote_qpn = timewait_info->remote_qpn; 647 648 while (*link) { 649 parent = *link; 650 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 651 remote_qp_node); 652 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 653 link = &(*link)->rb_left; 654 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 655 link = &(*link)->rb_right; 656 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 657 link = &(*link)->rb_left; 658 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 659 link = &(*link)->rb_right; 660 else 661 return cur_timewait_info; 662 } 663 timewait_info->inserted_remote_qp = 1; 664 rb_link_node(&timewait_info->remote_qp_node, parent, link); 665 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 666 return NULL; 667} 668 669static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 670 *cm_id_priv) 671{ 672 struct rb_node **link = &cm.remote_sidr_table.rb_node; 673 struct rb_node *parent = NULL; 674 struct cm_id_private *cur_cm_id_priv; 675 union ib_gid *port_gid = &cm_id_priv->av.dgid; 676 __be32 remote_id = cm_id_priv->id.remote_id; 677 678 while (*link) { 679 parent = *link; 680 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 681 sidr_id_node); 682 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 683 link = &(*link)->rb_left; 684 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 685 link = &(*link)->rb_right; 686 else { 687 int cmp; 688 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 689 sizeof *port_gid); 690 if (cmp < 0) 691 link = &(*link)->rb_left; 692 else if (cmp > 0) 693 link = &(*link)->rb_right; 694 else 695 return cur_cm_id_priv; 696 } 697 } 698 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 699 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 700 return NULL; 701} 702 703static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 704 enum ib_cm_sidr_status status) 705{ 706 struct ib_cm_sidr_rep_param param; 707 708 memset(¶m, 0, sizeof param); 709 param.status = status; 710 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 711} 712 713struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 714 ib_cm_handler cm_handler, 715 void *context) 716{ 717 struct cm_id_private *cm_id_priv; 718 int ret; 719 720 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 721 if (!cm_id_priv) 722 return ERR_PTR(-ENOMEM); 723 724 cm_id_priv->id.state = IB_CM_IDLE; 725 cm_id_priv->id.device = device; 726 cm_id_priv->id.cm_handler = cm_handler; 727 cm_id_priv->id.context = context; 728 cm_id_priv->id.remote_cm_qpn = 1; 729 ret = cm_alloc_id(cm_id_priv); 730 if (ret) 731 goto error; 732 733 spin_lock_init(&cm_id_priv->lock); 734 init_completion(&cm_id_priv->comp); 735 INIT_LIST_HEAD(&cm_id_priv->work_list); 736 INIT_LIST_HEAD(&cm_id_priv->prim_list); 737 INIT_LIST_HEAD(&cm_id_priv->altr_list); 738 atomic_set(&cm_id_priv->work_count, -1); 739 atomic_set(&cm_id_priv->refcount, 1); 740 return &cm_id_priv->id; 741 742error: 743 kfree(cm_id_priv); 744 return ERR_PTR(-ENOMEM); 745} 746EXPORT_SYMBOL(ib_create_cm_id); 747 748static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 749{ 750 struct cm_work *work; 751 752 if (list_empty(&cm_id_priv->work_list)) 753 return NULL; 754 755 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 756 list_del(&work->list); 757 return work; 758} 759 760static void cm_free_work(struct cm_work *work) 761{ 762 if (work->mad_recv_wc) 763 ib_free_recv_mad(work->mad_recv_wc); 764 kfree(work); 765} 766 767static inline int cm_convert_to_ms(int iba_time) 768{ 769 /* approximate conversion to ms from 4.096us x 2^iba_time */ 770 return 1 << max(iba_time - 8, 0); 771} 772 773/* 774 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 775 * Because of how ack_timeout is stored, adding one doubles the timeout. 776 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 777 * increment it (round up) only if the other is within 50%. 778 */ 779static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 780{ 781 int ack_timeout = packet_life_time + 1; 782 783 if (ack_timeout >= ca_ack_delay) 784 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 785 else 786 ack_timeout = ca_ack_delay + 787 (ack_timeout >= (ca_ack_delay - 1)); 788 789 return min(31, ack_timeout); 790} 791 792static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 793{ 794 if (timewait_info->inserted_remote_id) { 795 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 796 timewait_info->inserted_remote_id = 0; 797 } 798 799 if (timewait_info->inserted_remote_qp) { 800 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 801 timewait_info->inserted_remote_qp = 0; 802 } 803} 804 805static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 806{ 807 struct cm_timewait_info *timewait_info; 808 809 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 810 if (!timewait_info) 811 return ERR_PTR(-ENOMEM); 812 813 timewait_info->work.local_id = local_id; 814 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 815 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 816 return timewait_info; 817} 818 819static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 820{ 821 int wait_time; 822 unsigned long flags; 823 struct cm_device *cm_dev; 824 825 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client); 826 if (!cm_dev) 827 return; 828 829 spin_lock_irqsave(&cm.lock, flags); 830 cm_cleanup_timewait(cm_id_priv->timewait_info); 831 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 832 spin_unlock_irqrestore(&cm.lock, flags); 833 834 /* 835 * The cm_id could be destroyed by the user before we exit timewait. 836 * To protect against this, we search for the cm_id after exiting 837 * timewait before notifying the user that we've exited timewait. 838 */ 839 cm_id_priv->id.state = IB_CM_TIMEWAIT; 840 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 841 842 /* Check if the device started its remove_one */ 843 spin_lock_irqsave(&cm.lock, flags); 844 if (!cm_dev->going_down) 845 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 846 msecs_to_jiffies(wait_time)); 847 spin_unlock_irqrestore(&cm.lock, flags); 848 849 cm_id_priv->timewait_info = NULL; 850} 851 852static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 853{ 854 unsigned long flags; 855 856 cm_id_priv->id.state = IB_CM_IDLE; 857 if (cm_id_priv->timewait_info) { 858 spin_lock_irqsave(&cm.lock, flags); 859 cm_cleanup_timewait(cm_id_priv->timewait_info); 860 spin_unlock_irqrestore(&cm.lock, flags); 861 kfree(cm_id_priv->timewait_info); 862 cm_id_priv->timewait_info = NULL; 863 } 864} 865 866static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 867{ 868 struct cm_id_private *cm_id_priv; 869 struct cm_work *work; 870 871 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 872retest: 873 spin_lock_irq(&cm_id_priv->lock); 874 switch (cm_id->state) { 875 case IB_CM_LISTEN: 876 spin_unlock_irq(&cm_id_priv->lock); 877 878 spin_lock_irq(&cm.lock); 879 if (--cm_id_priv->listen_sharecount > 0) { 880 /* The id is still shared. */ 881 cm_deref_id(cm_id_priv); 882 spin_unlock_irq(&cm.lock); 883 return; 884 } 885 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 886 spin_unlock_irq(&cm.lock); 887 break; 888 case IB_CM_SIDR_REQ_SENT: 889 cm_id->state = IB_CM_IDLE; 890 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 891 spin_unlock_irq(&cm_id_priv->lock); 892 break; 893 case IB_CM_SIDR_REQ_RCVD: 894 spin_unlock_irq(&cm_id_priv->lock); 895 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 896 spin_lock_irq(&cm.lock); 897 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) 898 rb_erase(&cm_id_priv->sidr_id_node, 899 &cm.remote_sidr_table); 900 spin_unlock_irq(&cm.lock); 901 break; 902 case IB_CM_REQ_SENT: 903 case IB_CM_MRA_REQ_RCVD: 904 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 905 spin_unlock_irq(&cm_id_priv->lock); 906 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 907 &cm_id_priv->id.device->node_guid, 908 sizeof cm_id_priv->id.device->node_guid, 909 NULL, 0); 910 break; 911 case IB_CM_REQ_RCVD: 912 if (err == -ENOMEM) { 913 /* Do not reject to allow future retries. */ 914 cm_reset_to_idle(cm_id_priv); 915 spin_unlock_irq(&cm_id_priv->lock); 916 } else { 917 spin_unlock_irq(&cm_id_priv->lock); 918 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 919 NULL, 0, NULL, 0); 920 } 921 break; 922 case IB_CM_REP_SENT: 923 case IB_CM_MRA_REP_RCVD: 924 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 925 /* Fall through */ 926 case IB_CM_MRA_REQ_SENT: 927 case IB_CM_REP_RCVD: 928 case IB_CM_MRA_REP_SENT: 929 spin_unlock_irq(&cm_id_priv->lock); 930 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 931 NULL, 0, NULL, 0); 932 break; 933 case IB_CM_ESTABLISHED: 934 spin_unlock_irq(&cm_id_priv->lock); 935 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 936 break; 937 ib_send_cm_dreq(cm_id, NULL, 0); 938 goto retest; 939 case IB_CM_DREQ_SENT: 940 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 941 cm_enter_timewait(cm_id_priv); 942 spin_unlock_irq(&cm_id_priv->lock); 943 break; 944 case IB_CM_DREQ_RCVD: 945 spin_unlock_irq(&cm_id_priv->lock); 946 ib_send_cm_drep(cm_id, NULL, 0); 947 break; 948 default: 949 spin_unlock_irq(&cm_id_priv->lock); 950 break; 951 } 952 953 spin_lock_irq(&cm.lock); 954 if (!list_empty(&cm_id_priv->altr_list) && 955 (!cm_id_priv->altr_send_port_not_ready)) 956 list_del(&cm_id_priv->altr_list); 957 if (!list_empty(&cm_id_priv->prim_list) && 958 (!cm_id_priv->prim_send_port_not_ready)) 959 list_del(&cm_id_priv->prim_list); 960 spin_unlock_irq(&cm.lock); 961 962 cm_free_id(cm_id->local_id); 963 cm_deref_id(cm_id_priv); 964 wait_for_completion(&cm_id_priv->comp); 965 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 966 cm_free_work(work); 967 kfree(cm_id_priv->private_data); 968 kfree(cm_id_priv); 969} 970 971void ib_destroy_cm_id(struct ib_cm_id *cm_id) 972{ 973 cm_destroy_id(cm_id, 0); 974} 975EXPORT_SYMBOL(ib_destroy_cm_id); 976 977/** 978 * __ib_cm_listen - Initiates listening on the specified service ID for 979 * connection and service ID resolution requests. 980 * @cm_id: Connection identifier associated with the listen request. 981 * @service_id: Service identifier matched against incoming connection 982 * and service ID resolution requests. The service ID should be specified 983 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 984 * assign a service ID to the caller. 985 * @service_mask: Mask applied to service ID used to listen across a 986 * range of service IDs. If set to 0, the service ID is matched 987 * exactly. This parameter is ignored if %service_id is set to 988 * IB_CM_ASSIGN_SERVICE_ID. 989 */ 990static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, 991 __be64 service_mask) 992{ 993 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 994 int ret = 0; 995 996 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 997 service_id &= service_mask; 998 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 999 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 1000 return -EINVAL; 1001 1002 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1003 if (cm_id->state != IB_CM_IDLE) 1004 return -EINVAL; 1005 1006 cm_id->state = IB_CM_LISTEN; 1007 ++cm_id_priv->listen_sharecount; 1008 1009 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 1010 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 1011 cm_id->service_mask = ~cpu_to_be64(0); 1012 } else { 1013 cm_id->service_id = service_id; 1014 cm_id->service_mask = service_mask; 1015 } 1016 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 1017 1018 if (cur_cm_id_priv) { 1019 cm_id->state = IB_CM_IDLE; 1020 --cm_id_priv->listen_sharecount; 1021 ret = -EBUSY; 1022 } 1023 return ret; 1024} 1025 1026int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask) 1027{ 1028 unsigned long flags; 1029 int ret; 1030 1031 spin_lock_irqsave(&cm.lock, flags); 1032 ret = __ib_cm_listen(cm_id, service_id, service_mask); 1033 spin_unlock_irqrestore(&cm.lock, flags); 1034 1035 return ret; 1036} 1037EXPORT_SYMBOL(ib_cm_listen); 1038 1039/** 1040 * Create a new listening ib_cm_id and listen on the given service ID. 1041 * 1042 * If there's an existing ID listening on that same device and service ID, 1043 * return it. 1044 * 1045 * @device: Device associated with the cm_id. All related communication will 1046 * be associated with the specified device. 1047 * @cm_handler: Callback invoked to notify the user of CM events. 1048 * @service_id: Service identifier matched against incoming connection 1049 * and service ID resolution requests. The service ID should be specified 1050 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will 1051 * assign a service ID to the caller. 1052 * 1053 * Callers should call ib_destroy_cm_id when done with the listener ID. 1054 */ 1055struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device, 1056 ib_cm_handler cm_handler, 1057 __be64 service_id) 1058{ 1059 struct cm_id_private *cm_id_priv; 1060 struct ib_cm_id *cm_id; 1061 unsigned long flags; 1062 int err = 0; 1063 1064 /* Create an ID in advance, since the creation may sleep */ 1065 cm_id = ib_create_cm_id(device, cm_handler, NULL); 1066 if (IS_ERR(cm_id)) 1067 return cm_id; 1068 1069 spin_lock_irqsave(&cm.lock, flags); 1070 1071 if (service_id == IB_CM_ASSIGN_SERVICE_ID) 1072 goto new_id; 1073 1074 /* Find an existing ID */ 1075 cm_id_priv = cm_find_listen(device, service_id); 1076 if (cm_id_priv) { 1077 if (cm_id->cm_handler != cm_handler || cm_id->context) { 1078 /* Sharing an ib_cm_id with different handlers is not 1079 * supported */ 1080 spin_unlock_irqrestore(&cm.lock, flags); 1081 return ERR_PTR(-EINVAL); 1082 } 1083 atomic_inc(&cm_id_priv->refcount); 1084 ++cm_id_priv->listen_sharecount; 1085 spin_unlock_irqrestore(&cm.lock, flags); 1086 1087 ib_destroy_cm_id(cm_id); 1088 cm_id = &cm_id_priv->id; 1089 return cm_id; 1090 } 1091 1092new_id: 1093 /* Use newly created ID */ 1094 err = __ib_cm_listen(cm_id, service_id, 0); 1095 1096 spin_unlock_irqrestore(&cm.lock, flags); 1097 1098 if (err) { 1099 ib_destroy_cm_id(cm_id); 1100 return ERR_PTR(err); 1101 } 1102 return cm_id; 1103} 1104EXPORT_SYMBOL(ib_cm_insert_listen); 1105 1106static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 1107 enum cm_msg_sequence msg_seq) 1108{ 1109 u64 hi_tid, low_tid; 1110 1111 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 1112 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 1113 (msg_seq << 30)); 1114 return cpu_to_be64(hi_tid | low_tid); 1115} 1116 1117static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1118 __be16 attr_id, __be64 tid) 1119{ 1120 hdr->base_version = IB_MGMT_BASE_VERSION; 1121 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1122 hdr->class_version = IB_CM_CLASS_VERSION; 1123 hdr->method = IB_MGMT_METHOD_SEND; 1124 hdr->attr_id = attr_id; 1125 hdr->tid = tid; 1126} 1127 1128static void cm_format_req(struct cm_req_msg *req_msg, 1129 struct cm_id_private *cm_id_priv, 1130 struct ib_cm_req_param *param) 1131{ 1132 struct ib_sa_path_rec *pri_path = param->primary_path; 1133 struct ib_sa_path_rec *alt_path = param->alternate_path; 1134 1135 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1136 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1137 1138 req_msg->local_comm_id = cm_id_priv->id.local_id; 1139 req_msg->service_id = param->service_id; 1140 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1141 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1142 cm_req_set_init_depth(req_msg, param->initiator_depth); 1143 cm_req_set_remote_resp_timeout(req_msg, 1144 param->remote_cm_response_timeout); 1145 cm_req_set_qp_type(req_msg, param->qp_type); 1146 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1147 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1148 cm_req_set_local_resp_timeout(req_msg, 1149 param->local_cm_response_timeout); 1150 req_msg->pkey = param->primary_path->pkey; 1151 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1152 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1153 1154 if (param->qp_type != IB_QPT_XRC_INI) { 1155 cm_req_set_resp_res(req_msg, param->responder_resources); 1156 cm_req_set_retry_count(req_msg, param->retry_count); 1157 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1158 cm_req_set_srq(req_msg, param->srq); 1159 } 1160 1161 if (pri_path->hop_limit <= 1) { 1162 req_msg->primary_local_lid = pri_path->slid; 1163 req_msg->primary_remote_lid = pri_path->dlid; 1164 } else { 1165 /* Work-around until there's a way to obtain remote LID info */ 1166 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1167 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1168 } 1169 req_msg->primary_local_gid = pri_path->sgid; 1170 req_msg->primary_remote_gid = pri_path->dgid; 1171 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1172 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1173 req_msg->primary_traffic_class = pri_path->traffic_class; 1174 req_msg->primary_hop_limit = pri_path->hop_limit; 1175 cm_req_set_primary_sl(req_msg, pri_path->sl); 1176 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1177 cm_req_set_primary_local_ack_timeout(req_msg, 1178 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1179 pri_path->packet_life_time)); 1180 1181 if (alt_path) { 1182 if (alt_path->hop_limit <= 1) { 1183 req_msg->alt_local_lid = alt_path->slid; 1184 req_msg->alt_remote_lid = alt_path->dlid; 1185 } else { 1186 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1187 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1188 } 1189 req_msg->alt_local_gid = alt_path->sgid; 1190 req_msg->alt_remote_gid = alt_path->dgid; 1191 cm_req_set_alt_flow_label(req_msg, 1192 alt_path->flow_label); 1193 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1194 req_msg->alt_traffic_class = alt_path->traffic_class; 1195 req_msg->alt_hop_limit = alt_path->hop_limit; 1196 cm_req_set_alt_sl(req_msg, alt_path->sl); 1197 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1198 cm_req_set_alt_local_ack_timeout(req_msg, 1199 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1200 alt_path->packet_life_time)); 1201 } 1202 1203 if (param->private_data && param->private_data_len) 1204 memcpy(req_msg->private_data, param->private_data, 1205 param->private_data_len); 1206} 1207 1208static int cm_validate_req_param(struct ib_cm_req_param *param) 1209{ 1210 /* peer-to-peer not supported */ 1211 if (param->peer_to_peer) 1212 return -EINVAL; 1213 1214 if (!param->primary_path) 1215 return -EINVAL; 1216 1217 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1218 param->qp_type != IB_QPT_XRC_INI) 1219 return -EINVAL; 1220 1221 if (param->private_data && 1222 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1223 return -EINVAL; 1224 1225 if (param->alternate_path && 1226 (param->alternate_path->pkey != param->primary_path->pkey || 1227 param->alternate_path->mtu != param->primary_path->mtu)) 1228 return -EINVAL; 1229 1230 return 0; 1231} 1232 1233int ib_send_cm_req(struct ib_cm_id *cm_id, 1234 struct ib_cm_req_param *param) 1235{ 1236 struct cm_id_private *cm_id_priv; 1237 struct cm_req_msg *req_msg; 1238 unsigned long flags; 1239 int ret; 1240 1241 ret = cm_validate_req_param(param); 1242 if (ret) 1243 return ret; 1244 1245 /* Verify that we're not in timewait. */ 1246 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1247 spin_lock_irqsave(&cm_id_priv->lock, flags); 1248 if (cm_id->state != IB_CM_IDLE) { 1249 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1250 ret = -EINVAL; 1251 goto out; 1252 } 1253 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1254 1255 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1256 id.local_id); 1257 if (IS_ERR(cm_id_priv->timewait_info)) { 1258 ret = PTR_ERR(cm_id_priv->timewait_info); 1259 goto out; 1260 } 1261 1262 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av, 1263 cm_id_priv); 1264 if (ret) 1265 goto error1; 1266 if (param->alternate_path) { 1267 ret = cm_init_av_by_path(param->alternate_path, 1268 &cm_id_priv->alt_av, cm_id_priv); 1269 if (ret) 1270 goto error1; 1271 } 1272 cm_id->service_id = param->service_id; 1273 cm_id->service_mask = ~cpu_to_be64(0); 1274 cm_id_priv->timeout_ms = cm_convert_to_ms( 1275 param->primary_path->packet_life_time) * 2 + 1276 cm_convert_to_ms( 1277 param->remote_cm_response_timeout); 1278 cm_id_priv->max_cm_retries = param->max_cm_retries; 1279 cm_id_priv->initiator_depth = param->initiator_depth; 1280 cm_id_priv->responder_resources = param->responder_resources; 1281 cm_id_priv->retry_count = param->retry_count; 1282 cm_id_priv->path_mtu = param->primary_path->mtu; 1283 cm_id_priv->pkey = param->primary_path->pkey; 1284 cm_id_priv->qp_type = param->qp_type; 1285 1286 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1287 if (ret) 1288 goto error1; 1289 1290 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1291 cm_format_req(req_msg, cm_id_priv, param); 1292 cm_id_priv->tid = req_msg->hdr.tid; 1293 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1294 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1295 1296 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1297 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1298 1299 spin_lock_irqsave(&cm_id_priv->lock, flags); 1300 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1301 if (ret) { 1302 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1303 goto error2; 1304 } 1305 BUG_ON(cm_id->state != IB_CM_IDLE); 1306 cm_id->state = IB_CM_REQ_SENT; 1307 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1308 return 0; 1309 1310error2: cm_free_msg(cm_id_priv->msg); 1311error1: kfree(cm_id_priv->timewait_info); 1312out: return ret; 1313} 1314EXPORT_SYMBOL(ib_send_cm_req); 1315 1316static int cm_issue_rej(struct cm_port *port, 1317 struct ib_mad_recv_wc *mad_recv_wc, 1318 enum ib_cm_rej_reason reason, 1319 enum cm_msg_response msg_rejected, 1320 void *ari, u8 ari_length) 1321{ 1322 struct ib_mad_send_buf *msg = NULL; 1323 struct cm_rej_msg *rej_msg, *rcv_msg; 1324 int ret; 1325 1326 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1327 if (ret) 1328 return ret; 1329 1330 /* We just need common CM header information. Cast to any message. */ 1331 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1332 rej_msg = (struct cm_rej_msg *) msg->mad; 1333 1334 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1335 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1336 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1337 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1338 rej_msg->reason = cpu_to_be16(reason); 1339 1340 if (ari && ari_length) { 1341 cm_rej_set_reject_info_len(rej_msg, ari_length); 1342 memcpy(rej_msg->ari, ari, ari_length); 1343 } 1344 1345 ret = ib_post_send_mad(msg, NULL); 1346 if (ret) 1347 cm_free_msg(msg); 1348 1349 return ret; 1350} 1351 1352static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1353 struct ib_sa_path_rec *primary_path, 1354 struct ib_sa_path_rec *alt_path) 1355{ 1356 memset(primary_path, 0, sizeof *primary_path); 1357 primary_path->dgid = req_msg->primary_local_gid; 1358 primary_path->sgid = req_msg->primary_remote_gid; 1359 primary_path->dlid = req_msg->primary_local_lid; 1360 primary_path->slid = req_msg->primary_remote_lid; 1361 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1362 primary_path->hop_limit = req_msg->primary_hop_limit; 1363 primary_path->traffic_class = req_msg->primary_traffic_class; 1364 primary_path->reversible = 1; 1365 primary_path->pkey = req_msg->pkey; 1366 primary_path->sl = cm_req_get_primary_sl(req_msg); 1367 primary_path->mtu_selector = IB_SA_EQ; 1368 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1369 primary_path->rate_selector = IB_SA_EQ; 1370 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1371 primary_path->packet_life_time_selector = IB_SA_EQ; 1372 primary_path->packet_life_time = 1373 cm_req_get_primary_local_ack_timeout(req_msg); 1374 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1375 primary_path->service_id = req_msg->service_id; 1376 1377 if (req_msg->alt_local_lid) { 1378 memset(alt_path, 0, sizeof *alt_path); 1379 alt_path->dgid = req_msg->alt_local_gid; 1380 alt_path->sgid = req_msg->alt_remote_gid; 1381 alt_path->dlid = req_msg->alt_local_lid; 1382 alt_path->slid = req_msg->alt_remote_lid; 1383 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1384 alt_path->hop_limit = req_msg->alt_hop_limit; 1385 alt_path->traffic_class = req_msg->alt_traffic_class; 1386 alt_path->reversible = 1; 1387 alt_path->pkey = req_msg->pkey; 1388 alt_path->sl = cm_req_get_alt_sl(req_msg); 1389 alt_path->mtu_selector = IB_SA_EQ; 1390 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1391 alt_path->rate_selector = IB_SA_EQ; 1392 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1393 alt_path->packet_life_time_selector = IB_SA_EQ; 1394 alt_path->packet_life_time = 1395 cm_req_get_alt_local_ack_timeout(req_msg); 1396 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1397 alt_path->service_id = req_msg->service_id; 1398 } 1399} 1400 1401static u16 cm_get_bth_pkey(struct cm_work *work) 1402{ 1403 struct ib_device *ib_dev = work->port->cm_dev->ib_device; 1404 u8 port_num = work->port->port_num; 1405 u16 pkey_index = work->mad_recv_wc->wc->pkey_index; 1406 u16 pkey; 1407 int ret; 1408 1409 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey); 1410 if (ret) { 1411 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n", 1412 port_num, pkey_index, ret); 1413 return 0; 1414 } 1415 1416 return pkey; 1417} 1418 1419static void cm_format_req_event(struct cm_work *work, 1420 struct cm_id_private *cm_id_priv, 1421 struct ib_cm_id *listen_id) 1422{ 1423 struct cm_req_msg *req_msg; 1424 struct ib_cm_req_event_param *param; 1425 1426 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1427 param = &work->cm_event.param.req_rcvd; 1428 param->listen_id = listen_id; 1429 param->bth_pkey = cm_get_bth_pkey(work); 1430 param->port = cm_id_priv->av.port->port_num; 1431 param->primary_path = &work->path[0]; 1432 if (req_msg->alt_local_lid) 1433 param->alternate_path = &work->path[1]; 1434 else 1435 param->alternate_path = NULL; 1436 param->remote_ca_guid = req_msg->local_ca_guid; 1437 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1438 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1439 param->qp_type = cm_req_get_qp_type(req_msg); 1440 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1441 param->responder_resources = cm_req_get_init_depth(req_msg); 1442 param->initiator_depth = cm_req_get_resp_res(req_msg); 1443 param->local_cm_response_timeout = 1444 cm_req_get_remote_resp_timeout(req_msg); 1445 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1446 param->remote_cm_response_timeout = 1447 cm_req_get_local_resp_timeout(req_msg); 1448 param->retry_count = cm_req_get_retry_count(req_msg); 1449 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1450 param->srq = cm_req_get_srq(req_msg); 1451 work->cm_event.private_data = &req_msg->private_data; 1452} 1453 1454static void cm_process_work(struct cm_id_private *cm_id_priv, 1455 struct cm_work *work) 1456{ 1457 int ret; 1458 1459 /* We will typically only have the current event to report. */ 1460 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1461 cm_free_work(work); 1462 1463 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1464 spin_lock_irq(&cm_id_priv->lock); 1465 work = cm_dequeue_work(cm_id_priv); 1466 spin_unlock_irq(&cm_id_priv->lock); 1467 BUG_ON(!work); 1468 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1469 &work->cm_event); 1470 cm_free_work(work); 1471 } 1472 cm_deref_id(cm_id_priv); 1473 if (ret) 1474 cm_destroy_id(&cm_id_priv->id, ret); 1475} 1476 1477static void cm_format_mra(struct cm_mra_msg *mra_msg, 1478 struct cm_id_private *cm_id_priv, 1479 enum cm_msg_response msg_mraed, u8 service_timeout, 1480 const void *private_data, u8 private_data_len) 1481{ 1482 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1483 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1484 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1485 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1486 cm_mra_set_service_timeout(mra_msg, service_timeout); 1487 1488 if (private_data && private_data_len) 1489 memcpy(mra_msg->private_data, private_data, private_data_len); 1490} 1491 1492static void cm_format_rej(struct cm_rej_msg *rej_msg, 1493 struct cm_id_private *cm_id_priv, 1494 enum ib_cm_rej_reason reason, 1495 void *ari, 1496 u8 ari_length, 1497 const void *private_data, 1498 u8 private_data_len) 1499{ 1500 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1501 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1502 1503 switch(cm_id_priv->id.state) { 1504 case IB_CM_REQ_RCVD: 1505 rej_msg->local_comm_id = 0; 1506 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1507 break; 1508 case IB_CM_MRA_REQ_SENT: 1509 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1510 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1511 break; 1512 case IB_CM_REP_RCVD: 1513 case IB_CM_MRA_REP_SENT: 1514 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1515 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1516 break; 1517 default: 1518 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1519 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1520 break; 1521 } 1522 1523 rej_msg->reason = cpu_to_be16(reason); 1524 if (ari && ari_length) { 1525 cm_rej_set_reject_info_len(rej_msg, ari_length); 1526 memcpy(rej_msg->ari, ari, ari_length); 1527 } 1528 1529 if (private_data && private_data_len) 1530 memcpy(rej_msg->private_data, private_data, private_data_len); 1531} 1532 1533static void cm_dup_req_handler(struct cm_work *work, 1534 struct cm_id_private *cm_id_priv) 1535{ 1536 struct ib_mad_send_buf *msg = NULL; 1537 int ret; 1538 1539 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1540 counter[CM_REQ_COUNTER]); 1541 1542 /* Quick state check to discard duplicate REQs. */ 1543 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1544 return; 1545 1546 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1547 if (ret) 1548 return; 1549 1550 spin_lock_irq(&cm_id_priv->lock); 1551 switch (cm_id_priv->id.state) { 1552 case IB_CM_MRA_REQ_SENT: 1553 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1554 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1555 cm_id_priv->private_data, 1556 cm_id_priv->private_data_len); 1557 break; 1558 case IB_CM_TIMEWAIT: 1559 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1560 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1561 break; 1562 default: 1563 goto unlock; 1564 } 1565 spin_unlock_irq(&cm_id_priv->lock); 1566 1567 ret = ib_post_send_mad(msg, NULL); 1568 if (ret) 1569 goto free; 1570 return; 1571 1572unlock: spin_unlock_irq(&cm_id_priv->lock); 1573free: cm_free_msg(msg); 1574} 1575 1576static struct cm_id_private * cm_match_req(struct cm_work *work, 1577 struct cm_id_private *cm_id_priv) 1578{ 1579 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1580 struct cm_timewait_info *timewait_info; 1581 struct cm_req_msg *req_msg; 1582 1583 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1584 1585 /* Check for possible duplicate REQ. */ 1586 spin_lock_irq(&cm.lock); 1587 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1588 if (timewait_info) { 1589 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1590 timewait_info->work.remote_id); 1591 spin_unlock_irq(&cm.lock); 1592 if (cur_cm_id_priv) { 1593 cm_dup_req_handler(work, cur_cm_id_priv); 1594 cm_deref_id(cur_cm_id_priv); 1595 } 1596 return NULL; 1597 } 1598 1599 /* Check for stale connections. */ 1600 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1601 if (timewait_info) { 1602 cm_cleanup_timewait(cm_id_priv->timewait_info); 1603 spin_unlock_irq(&cm.lock); 1604 cm_issue_rej(work->port, work->mad_recv_wc, 1605 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1606 NULL, 0); 1607 return NULL; 1608 } 1609 1610 /* Find matching listen request. */ 1611 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1612 req_msg->service_id); 1613 if (!listen_cm_id_priv) { 1614 cm_cleanup_timewait(cm_id_priv->timewait_info); 1615 spin_unlock_irq(&cm.lock); 1616 cm_issue_rej(work->port, work->mad_recv_wc, 1617 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1618 NULL, 0); 1619 goto out; 1620 } 1621 atomic_inc(&listen_cm_id_priv->refcount); 1622 atomic_inc(&cm_id_priv->refcount); 1623 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1624 atomic_inc(&cm_id_priv->work_count); 1625 spin_unlock_irq(&cm.lock); 1626out: 1627 return listen_cm_id_priv; 1628} 1629 1630/* 1631 * Work-around for inter-subnet connections. If the LIDs are permissive, 1632 * we need to override the LID/SL data in the REQ with the LID information 1633 * in the work completion. 1634 */ 1635static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1636{ 1637 if (!cm_req_get_primary_subnet_local(req_msg)) { 1638 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1639 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1640 cm_req_set_primary_sl(req_msg, wc->sl); 1641 } 1642 1643 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1644 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1645 } 1646 1647 if (!cm_req_get_alt_subnet_local(req_msg)) { 1648 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1649 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1650 cm_req_set_alt_sl(req_msg, wc->sl); 1651 } 1652 1653 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1654 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1655 } 1656} 1657 1658static int cm_req_handler(struct cm_work *work) 1659{ 1660 struct ib_cm_id *cm_id; 1661 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1662 struct cm_req_msg *req_msg; 1663 union ib_gid gid; 1664 struct ib_gid_attr gid_attr; 1665 int ret; 1666 1667 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1668 1669 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1670 if (IS_ERR(cm_id)) 1671 return PTR_ERR(cm_id); 1672 1673 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1674 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1675 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1676 work->mad_recv_wc->recv_buf.grh, 1677 &cm_id_priv->av); 1678 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1679 id.local_id); 1680 if (IS_ERR(cm_id_priv->timewait_info)) { 1681 ret = PTR_ERR(cm_id_priv->timewait_info); 1682 goto destroy; 1683 } 1684 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1685 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1686 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1687 1688 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1689 if (!listen_cm_id_priv) { 1690 ret = -EINVAL; 1691 kfree(cm_id_priv->timewait_info); 1692 goto destroy; 1693 } 1694 1695 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1696 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1697 cm_id_priv->id.service_id = req_msg->service_id; 1698 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1699 1700 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1701 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1702 1703 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN); 1704 work->path[0].hop_limit = cm_id_priv->av.ah_attr.grh.hop_limit; 1705 ret = ib_get_cached_gid(work->port->cm_dev->ib_device, 1706 work->port->port_num, 1707 cm_id_priv->av.ah_attr.grh.sgid_index, 1708 &gid, &gid_attr); 1709 if (!ret) { 1710 if (gid_attr.ndev) { 1711 work->path[0].ifindex = gid_attr.ndev->if_index; 1712 work->path[0].net = dev_net(gid_attr.ndev); 1713 dev_put(gid_attr.ndev); 1714 } 1715 work->path[0].gid_type = gid_attr.gid_type; 1716 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av, 1717 cm_id_priv); 1718 } 1719 if (ret) { 1720 int err = ib_get_cached_gid(work->port->cm_dev->ib_device, 1721 work->port->port_num, 0, 1722 &work->path[0].sgid, 1723 &gid_attr); 1724 if (!err && gid_attr.ndev) { 1725 work->path[0].ifindex = gid_attr.ndev->if_index; 1726 work->path[0].net = dev_net(gid_attr.ndev); 1727 dev_put(gid_attr.ndev); 1728 } 1729 work->path[0].gid_type = gid_attr.gid_type; 1730 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1731 &work->path[0].sgid, sizeof work->path[0].sgid, 1732 NULL, 0); 1733 goto rejected; 1734 } 1735 if (req_msg->alt_local_lid) { 1736 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av, 1737 cm_id_priv); 1738 if (ret) { 1739 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1740 &work->path[0].sgid, 1741 sizeof work->path[0].sgid, NULL, 0); 1742 goto rejected; 1743 } 1744 } 1745 cm_id_priv->tid = req_msg->hdr.tid; 1746 cm_id_priv->timeout_ms = cm_convert_to_ms( 1747 cm_req_get_local_resp_timeout(req_msg)); 1748 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1749 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1750 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1751 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1752 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1753 cm_id_priv->pkey = req_msg->pkey; 1754 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1755 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1756 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1757 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1758 1759 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1760 cm_process_work(cm_id_priv, work); 1761 cm_deref_id(listen_cm_id_priv); 1762 return 0; 1763 1764rejected: 1765 atomic_dec(&cm_id_priv->refcount); 1766 cm_deref_id(listen_cm_id_priv); 1767destroy: 1768 ib_destroy_cm_id(cm_id); 1769 return ret; 1770} 1771 1772static void cm_format_rep(struct cm_rep_msg *rep_msg, 1773 struct cm_id_private *cm_id_priv, 1774 struct ib_cm_rep_param *param) 1775{ 1776 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1777 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1778 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1779 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1780 rep_msg->resp_resources = param->responder_resources; 1781 cm_rep_set_target_ack_delay(rep_msg, 1782 cm_id_priv->av.port->cm_dev->ack_delay); 1783 cm_rep_set_failover(rep_msg, param->failover_accepted); 1784 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1785 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1786 1787 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1788 rep_msg->initiator_depth = param->initiator_depth; 1789 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1790 cm_rep_set_srq(rep_msg, param->srq); 1791 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1792 } else { 1793 cm_rep_set_srq(rep_msg, 1); 1794 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1795 } 1796 1797 if (param->private_data && param->private_data_len) 1798 memcpy(rep_msg->private_data, param->private_data, 1799 param->private_data_len); 1800} 1801 1802int ib_send_cm_rep(struct ib_cm_id *cm_id, 1803 struct ib_cm_rep_param *param) 1804{ 1805 struct cm_id_private *cm_id_priv; 1806 struct ib_mad_send_buf *msg; 1807 struct cm_rep_msg *rep_msg; 1808 unsigned long flags; 1809 int ret; 1810 1811 if (param->private_data && 1812 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1813 return -EINVAL; 1814 1815 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1816 spin_lock_irqsave(&cm_id_priv->lock, flags); 1817 if (cm_id->state != IB_CM_REQ_RCVD && 1818 cm_id->state != IB_CM_MRA_REQ_SENT) { 1819 ret = -EINVAL; 1820 goto out; 1821 } 1822 1823 ret = cm_alloc_msg(cm_id_priv, &msg); 1824 if (ret) 1825 goto out; 1826 1827 rep_msg = (struct cm_rep_msg *) msg->mad; 1828 cm_format_rep(rep_msg, cm_id_priv, param); 1829 msg->timeout_ms = cm_id_priv->timeout_ms; 1830 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1831 1832 ret = ib_post_send_mad(msg, NULL); 1833 if (ret) { 1834 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1835 cm_free_msg(msg); 1836 return ret; 1837 } 1838 1839 cm_id->state = IB_CM_REP_SENT; 1840 cm_id_priv->msg = msg; 1841 cm_id_priv->initiator_depth = param->initiator_depth; 1842 cm_id_priv->responder_resources = param->responder_resources; 1843 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1844 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1845 1846out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1847 return ret; 1848} 1849EXPORT_SYMBOL(ib_send_cm_rep); 1850 1851static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1852 struct cm_id_private *cm_id_priv, 1853 const void *private_data, 1854 u8 private_data_len) 1855{ 1856 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1857 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1858 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1859 1860 if (private_data && private_data_len) 1861 memcpy(rtu_msg->private_data, private_data, private_data_len); 1862} 1863 1864int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1865 const void *private_data, 1866 u8 private_data_len) 1867{ 1868 struct cm_id_private *cm_id_priv; 1869 struct ib_mad_send_buf *msg; 1870 unsigned long flags; 1871 void *data; 1872 int ret; 1873 1874 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1875 return -EINVAL; 1876 1877 data = cm_copy_private_data(private_data, private_data_len); 1878 if (IS_ERR(data)) 1879 return PTR_ERR(data); 1880 1881 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1882 spin_lock_irqsave(&cm_id_priv->lock, flags); 1883 if (cm_id->state != IB_CM_REP_RCVD && 1884 cm_id->state != IB_CM_MRA_REP_SENT) { 1885 ret = -EINVAL; 1886 goto error; 1887 } 1888 1889 ret = cm_alloc_msg(cm_id_priv, &msg); 1890 if (ret) 1891 goto error; 1892 1893 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1894 private_data, private_data_len); 1895 1896 ret = ib_post_send_mad(msg, NULL); 1897 if (ret) { 1898 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1899 cm_free_msg(msg); 1900 kfree(data); 1901 return ret; 1902 } 1903 1904 cm_id->state = IB_CM_ESTABLISHED; 1905 cm_set_private_data(cm_id_priv, data, private_data_len); 1906 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1907 return 0; 1908 1909error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1910 kfree(data); 1911 return ret; 1912} 1913EXPORT_SYMBOL(ib_send_cm_rtu); 1914 1915static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1916{ 1917 struct cm_rep_msg *rep_msg; 1918 struct ib_cm_rep_event_param *param; 1919 1920 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1921 param = &work->cm_event.param.rep_rcvd; 1922 param->remote_ca_guid = rep_msg->local_ca_guid; 1923 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1924 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1925 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1926 param->responder_resources = rep_msg->initiator_depth; 1927 param->initiator_depth = rep_msg->resp_resources; 1928 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1929 param->failover_accepted = cm_rep_get_failover(rep_msg); 1930 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1931 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1932 param->srq = cm_rep_get_srq(rep_msg); 1933 work->cm_event.private_data = &rep_msg->private_data; 1934} 1935 1936static void cm_dup_rep_handler(struct cm_work *work) 1937{ 1938 struct cm_id_private *cm_id_priv; 1939 struct cm_rep_msg *rep_msg; 1940 struct ib_mad_send_buf *msg = NULL; 1941 int ret; 1942 1943 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1944 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1945 rep_msg->local_comm_id); 1946 if (!cm_id_priv) 1947 return; 1948 1949 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1950 counter[CM_REP_COUNTER]); 1951 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1952 if (ret) 1953 goto deref; 1954 1955 spin_lock_irq(&cm_id_priv->lock); 1956 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1957 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1958 cm_id_priv->private_data, 1959 cm_id_priv->private_data_len); 1960 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1961 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1962 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1963 cm_id_priv->private_data, 1964 cm_id_priv->private_data_len); 1965 else 1966 goto unlock; 1967 spin_unlock_irq(&cm_id_priv->lock); 1968 1969 ret = ib_post_send_mad(msg, NULL); 1970 if (ret) 1971 goto free; 1972 goto deref; 1973 1974unlock: spin_unlock_irq(&cm_id_priv->lock); 1975free: cm_free_msg(msg); 1976deref: cm_deref_id(cm_id_priv); 1977} 1978 1979static int cm_rep_handler(struct cm_work *work) 1980{ 1981 struct cm_id_private *cm_id_priv; 1982 struct cm_rep_msg *rep_msg; 1983 int ret; 1984 1985 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1986 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1987 if (!cm_id_priv) { 1988 cm_dup_rep_handler(work); 1989 return -EINVAL; 1990 } 1991 1992 cm_format_rep_event(work, cm_id_priv->qp_type); 1993 1994 spin_lock_irq(&cm_id_priv->lock); 1995 switch (cm_id_priv->id.state) { 1996 case IB_CM_REQ_SENT: 1997 case IB_CM_MRA_REQ_RCVD: 1998 break; 1999 default: 2000 spin_unlock_irq(&cm_id_priv->lock); 2001 ret = -EINVAL; 2002 goto error; 2003 } 2004 2005 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 2006 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 2007 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2008 2009 spin_lock(&cm.lock); 2010 /* Check for duplicate REP. */ 2011 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 2012 spin_unlock(&cm.lock); 2013 spin_unlock_irq(&cm_id_priv->lock); 2014 ret = -EINVAL; 2015 goto error; 2016 } 2017 /* Check for a stale connection. */ 2018 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 2019 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 2020 &cm.remote_id_table); 2021 cm_id_priv->timewait_info->inserted_remote_id = 0; 2022 spin_unlock(&cm.lock); 2023 spin_unlock_irq(&cm_id_priv->lock); 2024 cm_issue_rej(work->port, work->mad_recv_wc, 2025 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 2026 NULL, 0); 2027 ret = -EINVAL; 2028 goto error; 2029 } 2030 spin_unlock(&cm.lock); 2031 2032 cm_id_priv->id.state = IB_CM_REP_RCVD; 2033 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 2034 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 2035 cm_id_priv->initiator_depth = rep_msg->resp_resources; 2036 cm_id_priv->responder_resources = rep_msg->initiator_depth; 2037 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 2038 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 2039 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 2040 cm_id_priv->av.timeout = 2041 cm_ack_timeout(cm_id_priv->target_ack_delay, 2042 cm_id_priv->av.timeout - 1); 2043 cm_id_priv->alt_av.timeout = 2044 cm_ack_timeout(cm_id_priv->target_ack_delay, 2045 cm_id_priv->alt_av.timeout - 1); 2046 2047 /* todo: handle peer_to_peer */ 2048 2049 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2050 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2051 if (!ret) 2052 list_add_tail(&work->list, &cm_id_priv->work_list); 2053 spin_unlock_irq(&cm_id_priv->lock); 2054 2055 if (ret) 2056 cm_process_work(cm_id_priv, work); 2057 else 2058 cm_deref_id(cm_id_priv); 2059 return 0; 2060 2061error: 2062 cm_deref_id(cm_id_priv); 2063 return ret; 2064} 2065 2066static int cm_establish_handler(struct cm_work *work) 2067{ 2068 struct cm_id_private *cm_id_priv; 2069 int ret; 2070 2071 /* See comment in cm_establish about lookup. */ 2072 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 2073 if (!cm_id_priv) 2074 return -EINVAL; 2075 2076 spin_lock_irq(&cm_id_priv->lock); 2077 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 2078 spin_unlock_irq(&cm_id_priv->lock); 2079 goto out; 2080 } 2081 2082 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2083 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2084 if (!ret) 2085 list_add_tail(&work->list, &cm_id_priv->work_list); 2086 spin_unlock_irq(&cm_id_priv->lock); 2087 2088 if (ret) 2089 cm_process_work(cm_id_priv, work); 2090 else 2091 cm_deref_id(cm_id_priv); 2092 return 0; 2093out: 2094 cm_deref_id(cm_id_priv); 2095 return -EINVAL; 2096} 2097 2098static int cm_rtu_handler(struct cm_work *work) 2099{ 2100 struct cm_id_private *cm_id_priv; 2101 struct cm_rtu_msg *rtu_msg; 2102 int ret; 2103 2104 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 2105 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 2106 rtu_msg->local_comm_id); 2107 if (!cm_id_priv) 2108 return -EINVAL; 2109 2110 work->cm_event.private_data = &rtu_msg->private_data; 2111 2112 spin_lock_irq(&cm_id_priv->lock); 2113 if (cm_id_priv->id.state != IB_CM_REP_SENT && 2114 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 2115 spin_unlock_irq(&cm_id_priv->lock); 2116 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2117 counter[CM_RTU_COUNTER]); 2118 goto out; 2119 } 2120 cm_id_priv->id.state = IB_CM_ESTABLISHED; 2121 2122 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2123 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2124 if (!ret) 2125 list_add_tail(&work->list, &cm_id_priv->work_list); 2126 spin_unlock_irq(&cm_id_priv->lock); 2127 2128 if (ret) 2129 cm_process_work(cm_id_priv, work); 2130 else 2131 cm_deref_id(cm_id_priv); 2132 return 0; 2133out: 2134 cm_deref_id(cm_id_priv); 2135 return -EINVAL; 2136} 2137 2138static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 2139 struct cm_id_private *cm_id_priv, 2140 const void *private_data, 2141 u8 private_data_len) 2142{ 2143 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2144 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 2145 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2146 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2147 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2148 2149 if (private_data && private_data_len) 2150 memcpy(dreq_msg->private_data, private_data, private_data_len); 2151} 2152 2153int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2154 const void *private_data, 2155 u8 private_data_len) 2156{ 2157 struct cm_id_private *cm_id_priv; 2158 struct ib_mad_send_buf *msg; 2159 unsigned long flags; 2160 int ret; 2161 2162 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2163 return -EINVAL; 2164 2165 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2166 spin_lock_irqsave(&cm_id_priv->lock, flags); 2167 if (cm_id->state != IB_CM_ESTABLISHED) { 2168 ret = -EINVAL; 2169 goto out; 2170 } 2171 2172 if (cm_id->lap_state == IB_CM_LAP_SENT || 2173 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2174 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2175 2176 ret = cm_alloc_msg(cm_id_priv, &msg); 2177 if (ret) { 2178 cm_enter_timewait(cm_id_priv); 2179 goto out; 2180 } 2181 2182 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2183 private_data, private_data_len); 2184 msg->timeout_ms = cm_id_priv->timeout_ms; 2185 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2186 2187 ret = ib_post_send_mad(msg, NULL); 2188 if (ret) { 2189 cm_enter_timewait(cm_id_priv); 2190 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2191 cm_free_msg(msg); 2192 return ret; 2193 } 2194 2195 cm_id->state = IB_CM_DREQ_SENT; 2196 cm_id_priv->msg = msg; 2197out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2198 return ret; 2199} 2200EXPORT_SYMBOL(ib_send_cm_dreq); 2201 2202static void cm_format_drep(struct cm_drep_msg *drep_msg, 2203 struct cm_id_private *cm_id_priv, 2204 const void *private_data, 2205 u8 private_data_len) 2206{ 2207 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2208 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2209 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2210 2211 if (private_data && private_data_len) 2212 memcpy(drep_msg->private_data, private_data, private_data_len); 2213} 2214 2215int ib_send_cm_drep(struct ib_cm_id *cm_id, 2216 const void *private_data, 2217 u8 private_data_len) 2218{ 2219 struct cm_id_private *cm_id_priv; 2220 struct ib_mad_send_buf *msg; 2221 unsigned long flags; 2222 void *data; 2223 int ret; 2224 2225 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2226 return -EINVAL; 2227 2228 data = cm_copy_private_data(private_data, private_data_len); 2229 if (IS_ERR(data)) 2230 return PTR_ERR(data); 2231 2232 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2233 spin_lock_irqsave(&cm_id_priv->lock, flags); 2234 if (cm_id->state != IB_CM_DREQ_RCVD) { 2235 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2236 kfree(data); 2237 return -EINVAL; 2238 } 2239 2240 cm_set_private_data(cm_id_priv, data, private_data_len); 2241 cm_enter_timewait(cm_id_priv); 2242 2243 ret = cm_alloc_msg(cm_id_priv, &msg); 2244 if (ret) 2245 goto out; 2246 2247 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2248 private_data, private_data_len); 2249 2250 ret = ib_post_send_mad(msg, NULL); 2251 if (ret) { 2252 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2253 cm_free_msg(msg); 2254 return ret; 2255 } 2256 2257out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2258 return ret; 2259} 2260EXPORT_SYMBOL(ib_send_cm_drep); 2261 2262static int cm_issue_drep(struct cm_port *port, 2263 struct ib_mad_recv_wc *mad_recv_wc) 2264{ 2265 struct ib_mad_send_buf *msg = NULL; 2266 struct cm_dreq_msg *dreq_msg; 2267 struct cm_drep_msg *drep_msg; 2268 int ret; 2269 2270 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2271 if (ret) 2272 return ret; 2273 2274 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2275 drep_msg = (struct cm_drep_msg *) msg->mad; 2276 2277 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2278 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2279 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2280 2281 ret = ib_post_send_mad(msg, NULL); 2282 if (ret) 2283 cm_free_msg(msg); 2284 2285 return ret; 2286} 2287 2288static int cm_dreq_handler(struct cm_work *work) 2289{ 2290 struct cm_id_private *cm_id_priv; 2291 struct cm_dreq_msg *dreq_msg; 2292 struct ib_mad_send_buf *msg = NULL; 2293 int ret; 2294 2295 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2296 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2297 dreq_msg->local_comm_id); 2298 if (!cm_id_priv) { 2299 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2300 counter[CM_DREQ_COUNTER]); 2301 cm_issue_drep(work->port, work->mad_recv_wc); 2302 return -EINVAL; 2303 } 2304 2305 work->cm_event.private_data = &dreq_msg->private_data; 2306 2307 spin_lock_irq(&cm_id_priv->lock); 2308 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2309 goto unlock; 2310 2311 switch (cm_id_priv->id.state) { 2312 case IB_CM_REP_SENT: 2313 case IB_CM_DREQ_SENT: 2314 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2315 break; 2316 case IB_CM_ESTABLISHED: 2317 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2318 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2319 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2320 break; 2321 case IB_CM_MRA_REP_RCVD: 2322 break; 2323 case IB_CM_TIMEWAIT: 2324 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2325 counter[CM_DREQ_COUNTER]); 2326 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2327 goto unlock; 2328 2329 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2330 cm_id_priv->private_data, 2331 cm_id_priv->private_data_len); 2332 spin_unlock_irq(&cm_id_priv->lock); 2333 2334 if (ib_post_send_mad(msg, NULL)) 2335 cm_free_msg(msg); 2336 goto deref; 2337 case IB_CM_DREQ_RCVD: 2338 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2339 counter[CM_DREQ_COUNTER]); 2340 goto unlock; 2341 default: 2342 goto unlock; 2343 } 2344 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2345 cm_id_priv->tid = dreq_msg->hdr.tid; 2346 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2347 if (!ret) 2348 list_add_tail(&work->list, &cm_id_priv->work_list); 2349 spin_unlock_irq(&cm_id_priv->lock); 2350 2351 if (ret) 2352 cm_process_work(cm_id_priv, work); 2353 else 2354 cm_deref_id(cm_id_priv); 2355 return 0; 2356 2357unlock: spin_unlock_irq(&cm_id_priv->lock); 2358deref: cm_deref_id(cm_id_priv); 2359 return -EINVAL; 2360} 2361 2362static int cm_drep_handler(struct cm_work *work) 2363{ 2364 struct cm_id_private *cm_id_priv; 2365 struct cm_drep_msg *drep_msg; 2366 int ret; 2367 2368 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2369 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2370 drep_msg->local_comm_id); 2371 if (!cm_id_priv) 2372 return -EINVAL; 2373 2374 work->cm_event.private_data = &drep_msg->private_data; 2375 2376 spin_lock_irq(&cm_id_priv->lock); 2377 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2378 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2379 spin_unlock_irq(&cm_id_priv->lock); 2380 goto out; 2381 } 2382 cm_enter_timewait(cm_id_priv); 2383 2384 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2385 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2386 if (!ret) 2387 list_add_tail(&work->list, &cm_id_priv->work_list); 2388 spin_unlock_irq(&cm_id_priv->lock); 2389 2390 if (ret) 2391 cm_process_work(cm_id_priv, work); 2392 else 2393 cm_deref_id(cm_id_priv); 2394 return 0; 2395out: 2396 cm_deref_id(cm_id_priv); 2397 return -EINVAL; 2398} 2399 2400int ib_send_cm_rej(struct ib_cm_id *cm_id, 2401 enum ib_cm_rej_reason reason, 2402 void *ari, 2403 u8 ari_length, 2404 const void *private_data, 2405 u8 private_data_len) 2406{ 2407 struct cm_id_private *cm_id_priv; 2408 struct ib_mad_send_buf *msg; 2409 unsigned long flags; 2410 int ret; 2411 2412 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2413 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2414 return -EINVAL; 2415 2416 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2417 2418 spin_lock_irqsave(&cm_id_priv->lock, flags); 2419 switch (cm_id->state) { 2420 case IB_CM_REQ_SENT: 2421 case IB_CM_MRA_REQ_RCVD: 2422 case IB_CM_REQ_RCVD: 2423 case IB_CM_MRA_REQ_SENT: 2424 case IB_CM_REP_RCVD: 2425 case IB_CM_MRA_REP_SENT: 2426 ret = cm_alloc_msg(cm_id_priv, &msg); 2427 if (!ret) 2428 cm_format_rej((struct cm_rej_msg *) msg->mad, 2429 cm_id_priv, reason, ari, ari_length, 2430 private_data, private_data_len); 2431 2432 cm_reset_to_idle(cm_id_priv); 2433 break; 2434 case IB_CM_REP_SENT: 2435 case IB_CM_MRA_REP_RCVD: 2436 ret = cm_alloc_msg(cm_id_priv, &msg); 2437 if (!ret) 2438 cm_format_rej((struct cm_rej_msg *) msg->mad, 2439 cm_id_priv, reason, ari, ari_length, 2440 private_data, private_data_len); 2441 2442 cm_enter_timewait(cm_id_priv); 2443 break; 2444 default: 2445 ret = -EINVAL; 2446 goto out; 2447 } 2448 2449 if (ret) 2450 goto out; 2451 2452 ret = ib_post_send_mad(msg, NULL); 2453 if (ret) 2454 cm_free_msg(msg); 2455 2456out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2457 return ret; 2458} 2459EXPORT_SYMBOL(ib_send_cm_rej); 2460 2461static void cm_format_rej_event(struct cm_work *work) 2462{ 2463 struct cm_rej_msg *rej_msg; 2464 struct ib_cm_rej_event_param *param; 2465 2466 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2467 param = &work->cm_event.param.rej_rcvd; 2468 param->ari = rej_msg->ari; 2469 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2470 param->reason = __be16_to_cpu(rej_msg->reason); 2471 work->cm_event.private_data = &rej_msg->private_data; 2472} 2473 2474static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2475{ 2476 struct cm_timewait_info *timewait_info; 2477 struct cm_id_private *cm_id_priv; 2478 __be32 remote_id; 2479 2480 remote_id = rej_msg->local_comm_id; 2481 2482 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2483 spin_lock_irq(&cm.lock); 2484 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2485 remote_id); 2486 if (!timewait_info) { 2487 spin_unlock_irq(&cm.lock); 2488 return NULL; 2489 } 2490 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2491 (timewait_info->work.local_id ^ 2492 cm.random_id_operand)); 2493 if (cm_id_priv) { 2494 if (cm_id_priv->id.remote_id == remote_id) 2495 atomic_inc(&cm_id_priv->refcount); 2496 else 2497 cm_id_priv = NULL; 2498 } 2499 spin_unlock_irq(&cm.lock); 2500 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2501 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2502 else 2503 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2504 2505 return cm_id_priv; 2506} 2507 2508static int cm_rej_handler(struct cm_work *work) 2509{ 2510 struct cm_id_private *cm_id_priv; 2511 struct cm_rej_msg *rej_msg; 2512 int ret; 2513 2514 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2515 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2516 if (!cm_id_priv) 2517 return -EINVAL; 2518 2519 cm_format_rej_event(work); 2520 2521 spin_lock_irq(&cm_id_priv->lock); 2522 switch (cm_id_priv->id.state) { 2523 case IB_CM_REQ_SENT: 2524 case IB_CM_MRA_REQ_RCVD: 2525 case IB_CM_REP_SENT: 2526 case IB_CM_MRA_REP_RCVD: 2527 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2528 /* fall through */ 2529 case IB_CM_REQ_RCVD: 2530 case IB_CM_MRA_REQ_SENT: 2531 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2532 cm_enter_timewait(cm_id_priv); 2533 else 2534 cm_reset_to_idle(cm_id_priv); 2535 break; 2536 case IB_CM_DREQ_SENT: 2537 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2538 /* fall through */ 2539 case IB_CM_REP_RCVD: 2540 case IB_CM_MRA_REP_SENT: 2541 cm_enter_timewait(cm_id_priv); 2542 break; 2543 case IB_CM_ESTABLISHED: 2544 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2545 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2546 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2547 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2548 cm_id_priv->msg); 2549 cm_enter_timewait(cm_id_priv); 2550 break; 2551 } 2552 /* fall through */ 2553 default: 2554 spin_unlock_irq(&cm_id_priv->lock); 2555 ret = -EINVAL; 2556 goto out; 2557 } 2558 2559 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2560 if (!ret) 2561 list_add_tail(&work->list, &cm_id_priv->work_list); 2562 spin_unlock_irq(&cm_id_priv->lock); 2563 2564 if (ret) 2565 cm_process_work(cm_id_priv, work); 2566 else 2567 cm_deref_id(cm_id_priv); 2568 return 0; 2569out: 2570 cm_deref_id(cm_id_priv); 2571 return -EINVAL; 2572} 2573 2574int ib_send_cm_mra(struct ib_cm_id *cm_id, 2575 u8 service_timeout, 2576 const void *private_data, 2577 u8 private_data_len) 2578{ 2579 struct cm_id_private *cm_id_priv; 2580 struct ib_mad_send_buf *msg; 2581 enum ib_cm_state cm_state; 2582 enum ib_cm_lap_state lap_state; 2583 enum cm_msg_response msg_response; 2584 void *data; 2585 unsigned long flags; 2586 int ret; 2587 2588 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2589 return -EINVAL; 2590 2591 data = cm_copy_private_data(private_data, private_data_len); 2592 if (IS_ERR(data)) 2593 return PTR_ERR(data); 2594 2595 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2596 2597 spin_lock_irqsave(&cm_id_priv->lock, flags); 2598 switch(cm_id_priv->id.state) { 2599 case IB_CM_REQ_RCVD: 2600 cm_state = IB_CM_MRA_REQ_SENT; 2601 lap_state = cm_id->lap_state; 2602 msg_response = CM_MSG_RESPONSE_REQ; 2603 break; 2604 case IB_CM_REP_RCVD: 2605 cm_state = IB_CM_MRA_REP_SENT; 2606 lap_state = cm_id->lap_state; 2607 msg_response = CM_MSG_RESPONSE_REP; 2608 break; 2609 case IB_CM_ESTABLISHED: 2610 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2611 cm_state = cm_id->state; 2612 lap_state = IB_CM_MRA_LAP_SENT; 2613 msg_response = CM_MSG_RESPONSE_OTHER; 2614 break; 2615 } 2616 default: 2617 ret = -EINVAL; 2618 goto error1; 2619 } 2620 2621 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2622 ret = cm_alloc_msg(cm_id_priv, &msg); 2623 if (ret) 2624 goto error1; 2625 2626 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2627 msg_response, service_timeout, 2628 private_data, private_data_len); 2629 ret = ib_post_send_mad(msg, NULL); 2630 if (ret) 2631 goto error2; 2632 } 2633 2634 cm_id->state = cm_state; 2635 cm_id->lap_state = lap_state; 2636 cm_id_priv->service_timeout = service_timeout; 2637 cm_set_private_data(cm_id_priv, data, private_data_len); 2638 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2639 return 0; 2640 2641error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2642 kfree(data); 2643 return ret; 2644 2645error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2646 kfree(data); 2647 cm_free_msg(msg); 2648 return ret; 2649} 2650EXPORT_SYMBOL(ib_send_cm_mra); 2651 2652static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2653{ 2654 switch (cm_mra_get_msg_mraed(mra_msg)) { 2655 case CM_MSG_RESPONSE_REQ: 2656 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2657 case CM_MSG_RESPONSE_REP: 2658 case CM_MSG_RESPONSE_OTHER: 2659 return cm_acquire_id(mra_msg->remote_comm_id, 2660 mra_msg->local_comm_id); 2661 default: 2662 return NULL; 2663 } 2664} 2665 2666static int cm_mra_handler(struct cm_work *work) 2667{ 2668 struct cm_id_private *cm_id_priv; 2669 struct cm_mra_msg *mra_msg; 2670 int timeout, ret; 2671 2672 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2673 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2674 if (!cm_id_priv) 2675 return -EINVAL; 2676 2677 work->cm_event.private_data = &mra_msg->private_data; 2678 work->cm_event.param.mra_rcvd.service_timeout = 2679 cm_mra_get_service_timeout(mra_msg); 2680 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2681 cm_convert_to_ms(cm_id_priv->av.timeout); 2682 2683 spin_lock_irq(&cm_id_priv->lock); 2684 switch (cm_id_priv->id.state) { 2685 case IB_CM_REQ_SENT: 2686 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2687 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2688 cm_id_priv->msg, timeout)) 2689 goto out; 2690 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2691 break; 2692 case IB_CM_REP_SENT: 2693 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2694 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2695 cm_id_priv->msg, timeout)) 2696 goto out; 2697 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2698 break; 2699 case IB_CM_ESTABLISHED: 2700 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2701 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2702 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2703 cm_id_priv->msg, timeout)) { 2704 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2705 atomic_long_inc(&work->port-> 2706 counter_group[CM_RECV_DUPLICATES]. 2707 counter[CM_MRA_COUNTER]); 2708 goto out; 2709 } 2710 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2711 break; 2712 case IB_CM_MRA_REQ_RCVD: 2713 case IB_CM_MRA_REP_RCVD: 2714 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2715 counter[CM_MRA_COUNTER]); 2716 /* fall through */ 2717 default: 2718 goto out; 2719 } 2720 2721 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2722 cm_id_priv->id.state; 2723 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2724 if (!ret) 2725 list_add_tail(&work->list, &cm_id_priv->work_list); 2726 spin_unlock_irq(&cm_id_priv->lock); 2727 2728 if (ret) 2729 cm_process_work(cm_id_priv, work); 2730 else 2731 cm_deref_id(cm_id_priv); 2732 return 0; 2733out: 2734 spin_unlock_irq(&cm_id_priv->lock); 2735 cm_deref_id(cm_id_priv); 2736 return -EINVAL; 2737} 2738 2739static void cm_format_lap(struct cm_lap_msg *lap_msg, 2740 struct cm_id_private *cm_id_priv, 2741 struct ib_sa_path_rec *alternate_path, 2742 const void *private_data, 2743 u8 private_data_len) 2744{ 2745 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2746 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2747 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2748 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2749 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2750 /* todo: need remote CM response timeout */ 2751 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2752 lap_msg->alt_local_lid = alternate_path->slid; 2753 lap_msg->alt_remote_lid = alternate_path->dlid; 2754 lap_msg->alt_local_gid = alternate_path->sgid; 2755 lap_msg->alt_remote_gid = alternate_path->dgid; 2756 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2757 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2758 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2759 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2760 cm_lap_set_sl(lap_msg, alternate_path->sl); 2761 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2762 cm_lap_set_local_ack_timeout(lap_msg, 2763 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2764 alternate_path->packet_life_time)); 2765 2766 if (private_data && private_data_len) 2767 memcpy(lap_msg->private_data, private_data, private_data_len); 2768} 2769 2770int ib_send_cm_lap(struct ib_cm_id *cm_id, 2771 struct ib_sa_path_rec *alternate_path, 2772 const void *private_data, 2773 u8 private_data_len) 2774{ 2775 struct cm_id_private *cm_id_priv; 2776 struct ib_mad_send_buf *msg; 2777 unsigned long flags; 2778 int ret; 2779 2780 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2781 return -EINVAL; 2782 2783 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2784 spin_lock_irqsave(&cm_id_priv->lock, flags); 2785 if (cm_id->state != IB_CM_ESTABLISHED || 2786 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2787 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2788 ret = -EINVAL; 2789 goto out; 2790 } 2791 2792 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av, 2793 cm_id_priv); 2794 if (ret) 2795 goto out; 2796 cm_id_priv->alt_av.timeout = 2797 cm_ack_timeout(cm_id_priv->target_ack_delay, 2798 cm_id_priv->alt_av.timeout - 1); 2799 2800 ret = cm_alloc_msg(cm_id_priv, &msg); 2801 if (ret) 2802 goto out; 2803 2804 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2805 alternate_path, private_data, private_data_len); 2806 msg->timeout_ms = cm_id_priv->timeout_ms; 2807 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2808 2809 ret = ib_post_send_mad(msg, NULL); 2810 if (ret) { 2811 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2812 cm_free_msg(msg); 2813 return ret; 2814 } 2815 2816 cm_id->lap_state = IB_CM_LAP_SENT; 2817 cm_id_priv->msg = msg; 2818 2819out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2820 return ret; 2821} 2822EXPORT_SYMBOL(ib_send_cm_lap); 2823 2824static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2825 struct ib_sa_path_rec *path, 2826 struct cm_lap_msg *lap_msg) 2827{ 2828 memset(path, 0, sizeof *path); 2829 path->dgid = lap_msg->alt_local_gid; 2830 path->sgid = lap_msg->alt_remote_gid; 2831 path->dlid = lap_msg->alt_local_lid; 2832 path->slid = lap_msg->alt_remote_lid; 2833 path->flow_label = cm_lap_get_flow_label(lap_msg); 2834 path->hop_limit = lap_msg->alt_hop_limit; 2835 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2836 path->reversible = 1; 2837 path->pkey = cm_id_priv->pkey; 2838 path->sl = cm_lap_get_sl(lap_msg); 2839 path->mtu_selector = IB_SA_EQ; 2840 path->mtu = cm_id_priv->path_mtu; 2841 path->rate_selector = IB_SA_EQ; 2842 path->rate = cm_lap_get_packet_rate(lap_msg); 2843 path->packet_life_time_selector = IB_SA_EQ; 2844 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2845 path->packet_life_time -= (path->packet_life_time > 0); 2846} 2847 2848static int cm_lap_handler(struct cm_work *work) 2849{ 2850 struct cm_id_private *cm_id_priv; 2851 struct cm_lap_msg *lap_msg; 2852 struct ib_cm_lap_event_param *param; 2853 struct ib_mad_send_buf *msg = NULL; 2854 int ret; 2855 2856 /* todo: verify LAP request and send reject APR if invalid. */ 2857 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2858 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2859 lap_msg->local_comm_id); 2860 if (!cm_id_priv) 2861 return -EINVAL; 2862 2863 param = &work->cm_event.param.lap_rcvd; 2864 param->alternate_path = &work->path[0]; 2865 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2866 work->cm_event.private_data = &lap_msg->private_data; 2867 2868 spin_lock_irq(&cm_id_priv->lock); 2869 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2870 goto unlock; 2871 2872 switch (cm_id_priv->id.lap_state) { 2873 case IB_CM_LAP_UNINIT: 2874 case IB_CM_LAP_IDLE: 2875 break; 2876 case IB_CM_MRA_LAP_SENT: 2877 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2878 counter[CM_LAP_COUNTER]); 2879 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2880 goto unlock; 2881 2882 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2883 CM_MSG_RESPONSE_OTHER, 2884 cm_id_priv->service_timeout, 2885 cm_id_priv->private_data, 2886 cm_id_priv->private_data_len); 2887 spin_unlock_irq(&cm_id_priv->lock); 2888 2889 if (ib_post_send_mad(msg, NULL)) 2890 cm_free_msg(msg); 2891 goto deref; 2892 case IB_CM_LAP_RCVD: 2893 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2894 counter[CM_LAP_COUNTER]); 2895 goto unlock; 2896 default: 2897 goto unlock; 2898 } 2899 2900 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2901 cm_id_priv->tid = lap_msg->hdr.tid; 2902 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2903 work->mad_recv_wc->recv_buf.grh, 2904 &cm_id_priv->av); 2905 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av, 2906 cm_id_priv); 2907 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2908 if (!ret) 2909 list_add_tail(&work->list, &cm_id_priv->work_list); 2910 spin_unlock_irq(&cm_id_priv->lock); 2911 2912 if (ret) 2913 cm_process_work(cm_id_priv, work); 2914 else 2915 cm_deref_id(cm_id_priv); 2916 return 0; 2917 2918unlock: spin_unlock_irq(&cm_id_priv->lock); 2919deref: cm_deref_id(cm_id_priv); 2920 return -EINVAL; 2921} 2922 2923static void cm_format_apr(struct cm_apr_msg *apr_msg, 2924 struct cm_id_private *cm_id_priv, 2925 enum ib_cm_apr_status status, 2926 void *info, 2927 u8 info_length, 2928 const void *private_data, 2929 u8 private_data_len) 2930{ 2931 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2932 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2933 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2934 apr_msg->ap_status = (u8) status; 2935 2936 if (info && info_length) { 2937 apr_msg->info_length = info_length; 2938 memcpy(apr_msg->info, info, info_length); 2939 } 2940 2941 if (private_data && private_data_len) 2942 memcpy(apr_msg->private_data, private_data, private_data_len); 2943} 2944 2945int ib_send_cm_apr(struct ib_cm_id *cm_id, 2946 enum ib_cm_apr_status status, 2947 void *info, 2948 u8 info_length, 2949 const void *private_data, 2950 u8 private_data_len) 2951{ 2952 struct cm_id_private *cm_id_priv; 2953 struct ib_mad_send_buf *msg; 2954 unsigned long flags; 2955 int ret; 2956 2957 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2958 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2959 return -EINVAL; 2960 2961 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2962 spin_lock_irqsave(&cm_id_priv->lock, flags); 2963 if (cm_id->state != IB_CM_ESTABLISHED || 2964 (cm_id->lap_state != IB_CM_LAP_RCVD && 2965 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2966 ret = -EINVAL; 2967 goto out; 2968 } 2969 2970 ret = cm_alloc_msg(cm_id_priv, &msg); 2971 if (ret) 2972 goto out; 2973 2974 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2975 info, info_length, private_data, private_data_len); 2976 ret = ib_post_send_mad(msg, NULL); 2977 if (ret) { 2978 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2979 cm_free_msg(msg); 2980 return ret; 2981 } 2982 2983 cm_id->lap_state = IB_CM_LAP_IDLE; 2984out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2985 return ret; 2986} 2987EXPORT_SYMBOL(ib_send_cm_apr); 2988 2989static int cm_apr_handler(struct cm_work *work) 2990{ 2991 struct cm_id_private *cm_id_priv; 2992 struct cm_apr_msg *apr_msg; 2993 int ret; 2994 2995 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2996 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2997 apr_msg->local_comm_id); 2998 if (!cm_id_priv) 2999 return -EINVAL; /* Unmatched reply. */ 3000 3001 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 3002 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 3003 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 3004 work->cm_event.private_data = &apr_msg->private_data; 3005 3006 spin_lock_irq(&cm_id_priv->lock); 3007 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 3008 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 3009 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 3010 spin_unlock_irq(&cm_id_priv->lock); 3011 goto out; 3012 } 3013 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 3014 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3015 cm_id_priv->msg = NULL; 3016 3017 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3018 if (!ret) 3019 list_add_tail(&work->list, &cm_id_priv->work_list); 3020 spin_unlock_irq(&cm_id_priv->lock); 3021 3022 if (ret) 3023 cm_process_work(cm_id_priv, work); 3024 else 3025 cm_deref_id(cm_id_priv); 3026 return 0; 3027out: 3028 cm_deref_id(cm_id_priv); 3029 return -EINVAL; 3030} 3031 3032static int cm_timewait_handler(struct cm_work *work) 3033{ 3034 struct cm_timewait_info *timewait_info; 3035 struct cm_id_private *cm_id_priv; 3036 int ret; 3037 3038 timewait_info = (struct cm_timewait_info *)work; 3039 spin_lock_irq(&cm.lock); 3040 list_del(&timewait_info->list); 3041 spin_unlock_irq(&cm.lock); 3042 3043 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 3044 timewait_info->work.remote_id); 3045 if (!cm_id_priv) 3046 return -EINVAL; 3047 3048 spin_lock_irq(&cm_id_priv->lock); 3049 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 3050 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 3051 spin_unlock_irq(&cm_id_priv->lock); 3052 goto out; 3053 } 3054 cm_id_priv->id.state = IB_CM_IDLE; 3055 ret = atomic_inc_and_test(&cm_id_priv->work_count); 3056 if (!ret) 3057 list_add_tail(&work->list, &cm_id_priv->work_list); 3058 spin_unlock_irq(&cm_id_priv->lock); 3059 3060 if (ret) 3061 cm_process_work(cm_id_priv, work); 3062 else 3063 cm_deref_id(cm_id_priv); 3064 return 0; 3065out: 3066 cm_deref_id(cm_id_priv); 3067 return -EINVAL; 3068} 3069 3070static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 3071 struct cm_id_private *cm_id_priv, 3072 struct ib_cm_sidr_req_param *param) 3073{ 3074 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 3075 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 3076 sidr_req_msg->request_id = cm_id_priv->id.local_id; 3077 sidr_req_msg->pkey = param->path->pkey; 3078 sidr_req_msg->service_id = param->service_id; 3079 3080 if (param->private_data && param->private_data_len) 3081 memcpy(sidr_req_msg->private_data, param->private_data, 3082 param->private_data_len); 3083} 3084 3085int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 3086 struct ib_cm_sidr_req_param *param) 3087{ 3088 struct cm_id_private *cm_id_priv; 3089 struct ib_mad_send_buf *msg; 3090 unsigned long flags; 3091 int ret; 3092 3093 if (!param->path || (param->private_data && 3094 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 3095 return -EINVAL; 3096 3097 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3098 ret = cm_init_av_by_path(param->path, &cm_id_priv->av, cm_id_priv); 3099 if (ret) 3100 goto out; 3101 3102 cm_id->service_id = param->service_id; 3103 cm_id->service_mask = ~cpu_to_be64(0); 3104 cm_id_priv->timeout_ms = param->timeout_ms; 3105 cm_id_priv->max_cm_retries = param->max_cm_retries; 3106 ret = cm_alloc_msg(cm_id_priv, &msg); 3107 if (ret) 3108 goto out; 3109 3110 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 3111 param); 3112 msg->timeout_ms = cm_id_priv->timeout_ms; 3113 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 3114 3115 spin_lock_irqsave(&cm_id_priv->lock, flags); 3116 if (cm_id->state == IB_CM_IDLE) 3117 ret = ib_post_send_mad(msg, NULL); 3118 else 3119 ret = -EINVAL; 3120 3121 if (ret) { 3122 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3123 cm_free_msg(msg); 3124 goto out; 3125 } 3126 cm_id->state = IB_CM_SIDR_REQ_SENT; 3127 cm_id_priv->msg = msg; 3128 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3129out: 3130 return ret; 3131} 3132EXPORT_SYMBOL(ib_send_cm_sidr_req); 3133 3134static void cm_format_sidr_req_event(struct cm_work *work, 3135 struct ib_cm_id *listen_id) 3136{ 3137 struct cm_sidr_req_msg *sidr_req_msg; 3138 struct ib_cm_sidr_req_event_param *param; 3139 3140 sidr_req_msg = (struct cm_sidr_req_msg *) 3141 work->mad_recv_wc->recv_buf.mad; 3142 param = &work->cm_event.param.sidr_req_rcvd; 3143 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 3144 param->listen_id = listen_id; 3145 param->service_id = sidr_req_msg->service_id; 3146 param->bth_pkey = cm_get_bth_pkey(work); 3147 param->port = work->port->port_num; 3148 work->cm_event.private_data = &sidr_req_msg->private_data; 3149} 3150 3151static int cm_sidr_req_handler(struct cm_work *work) 3152{ 3153 struct ib_cm_id *cm_id; 3154 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3155 struct cm_sidr_req_msg *sidr_req_msg; 3156 struct ib_wc *wc; 3157 3158 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3159 if (IS_ERR(cm_id)) 3160 return PTR_ERR(cm_id); 3161 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3162 3163 /* Record SGID/SLID and request ID for lookup. */ 3164 sidr_req_msg = (struct cm_sidr_req_msg *) 3165 work->mad_recv_wc->recv_buf.mad; 3166 wc = work->mad_recv_wc->wc; 3167 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3168 cm_id_priv->av.dgid.global.interface_id = 0; 3169 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3170 work->mad_recv_wc->recv_buf.grh, 3171 &cm_id_priv->av); 3172 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3173 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3174 atomic_inc(&cm_id_priv->work_count); 3175 3176 spin_lock_irq(&cm.lock); 3177 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3178 if (cur_cm_id_priv) { 3179 spin_unlock_irq(&cm.lock); 3180 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3181 counter[CM_SIDR_REQ_COUNTER]); 3182 goto out; /* Duplicate message. */ 3183 } 3184 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3185 cur_cm_id_priv = cm_find_listen(cm_id->device, 3186 sidr_req_msg->service_id); 3187 if (!cur_cm_id_priv) { 3188 spin_unlock_irq(&cm.lock); 3189 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3190 goto out; /* No match. */ 3191 } 3192 atomic_inc(&cur_cm_id_priv->refcount); 3193 atomic_inc(&cm_id_priv->refcount); 3194 spin_unlock_irq(&cm.lock); 3195 3196 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3197 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3198 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3199 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3200 3201 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3202 cm_process_work(cm_id_priv, work); 3203 cm_deref_id(cur_cm_id_priv); 3204 return 0; 3205out: 3206 ib_destroy_cm_id(&cm_id_priv->id); 3207 return -EINVAL; 3208} 3209 3210static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3211 struct cm_id_private *cm_id_priv, 3212 struct ib_cm_sidr_rep_param *param) 3213{ 3214 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3215 cm_id_priv->tid); 3216 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3217 sidr_rep_msg->status = param->status; 3218 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3219 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3220 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3221 3222 if (param->info && param->info_length) 3223 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3224 3225 if (param->private_data && param->private_data_len) 3226 memcpy(sidr_rep_msg->private_data, param->private_data, 3227 param->private_data_len); 3228} 3229 3230int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3231 struct ib_cm_sidr_rep_param *param) 3232{ 3233 struct cm_id_private *cm_id_priv; 3234 struct ib_mad_send_buf *msg; 3235 unsigned long flags; 3236 int ret; 3237 3238 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3239 (param->private_data && 3240 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3241 return -EINVAL; 3242 3243 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3244 spin_lock_irqsave(&cm_id_priv->lock, flags); 3245 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3246 ret = -EINVAL; 3247 goto error; 3248 } 3249 3250 ret = cm_alloc_msg(cm_id_priv, &msg); 3251 if (ret) 3252 goto error; 3253 3254 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3255 param); 3256 ret = ib_post_send_mad(msg, NULL); 3257 if (ret) { 3258 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3259 cm_free_msg(msg); 3260 return ret; 3261 } 3262 cm_id->state = IB_CM_IDLE; 3263 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3264 3265 spin_lock_irqsave(&cm.lock, flags); 3266 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) { 3267 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3268 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node); 3269 } 3270 spin_unlock_irqrestore(&cm.lock, flags); 3271 return 0; 3272 3273error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3274 return ret; 3275} 3276EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3277 3278static void cm_format_sidr_rep_event(struct cm_work *work) 3279{ 3280 struct cm_sidr_rep_msg *sidr_rep_msg; 3281 struct ib_cm_sidr_rep_event_param *param; 3282 3283 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3284 work->mad_recv_wc->recv_buf.mad; 3285 param = &work->cm_event.param.sidr_rep_rcvd; 3286 param->status = sidr_rep_msg->status; 3287 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3288 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3289 param->info = &sidr_rep_msg->info; 3290 param->info_len = sidr_rep_msg->info_length; 3291 work->cm_event.private_data = &sidr_rep_msg->private_data; 3292} 3293 3294static int cm_sidr_rep_handler(struct cm_work *work) 3295{ 3296 struct cm_sidr_rep_msg *sidr_rep_msg; 3297 struct cm_id_private *cm_id_priv; 3298 3299 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3300 work->mad_recv_wc->recv_buf.mad; 3301 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3302 if (!cm_id_priv) 3303 return -EINVAL; /* Unmatched reply. */ 3304 3305 spin_lock_irq(&cm_id_priv->lock); 3306 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3307 spin_unlock_irq(&cm_id_priv->lock); 3308 goto out; 3309 } 3310 cm_id_priv->id.state = IB_CM_IDLE; 3311 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3312 spin_unlock_irq(&cm_id_priv->lock); 3313 3314 cm_format_sidr_rep_event(work); 3315 cm_process_work(cm_id_priv, work); 3316 return 0; 3317out: 3318 cm_deref_id(cm_id_priv); 3319 return -EINVAL; 3320} 3321 3322static void cm_process_send_error(struct ib_mad_send_buf *msg, 3323 enum ib_wc_status wc_status) 3324{ 3325 struct cm_id_private *cm_id_priv; 3326 struct ib_cm_event cm_event; 3327 enum ib_cm_state state; 3328 int ret; 3329 3330 memset(&cm_event, 0, sizeof cm_event); 3331 cm_id_priv = msg->context[0]; 3332 3333 /* Discard old sends or ones without a response. */ 3334 spin_lock_irq(&cm_id_priv->lock); 3335 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3336 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3337 goto discard; 3338 3339 switch (state) { 3340 case IB_CM_REQ_SENT: 3341 case IB_CM_MRA_REQ_RCVD: 3342 cm_reset_to_idle(cm_id_priv); 3343 cm_event.event = IB_CM_REQ_ERROR; 3344 break; 3345 case IB_CM_REP_SENT: 3346 case IB_CM_MRA_REP_RCVD: 3347 cm_reset_to_idle(cm_id_priv); 3348 cm_event.event = IB_CM_REP_ERROR; 3349 break; 3350 case IB_CM_DREQ_SENT: 3351 cm_enter_timewait(cm_id_priv); 3352 cm_event.event = IB_CM_DREQ_ERROR; 3353 break; 3354 case IB_CM_SIDR_REQ_SENT: 3355 cm_id_priv->id.state = IB_CM_IDLE; 3356 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3357 break; 3358 default: 3359 goto discard; 3360 } 3361 spin_unlock_irq(&cm_id_priv->lock); 3362 cm_event.param.send_status = wc_status; 3363 3364 /* No other events can occur on the cm_id at this point. */ 3365 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3366 cm_free_msg(msg); 3367 if (ret) 3368 ib_destroy_cm_id(&cm_id_priv->id); 3369 return; 3370discard: 3371 spin_unlock_irq(&cm_id_priv->lock); 3372 cm_free_msg(msg); 3373} 3374 3375static void cm_send_handler(struct ib_mad_agent *mad_agent, 3376 struct ib_mad_send_wc *mad_send_wc) 3377{ 3378 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3379 struct cm_port *port; 3380 u16 attr_index; 3381 3382 port = mad_agent->context; 3383 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3384 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3385 3386 /* 3387 * If the send was in response to a received message (context[0] is not 3388 * set to a cm_id), and is not a REJ, then it is a send that was 3389 * manually retried. 3390 */ 3391 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3392 msg->retries = 1; 3393 3394 atomic_long_add(1 + msg->retries, 3395 &port->counter_group[CM_XMIT].counter[attr_index]); 3396 if (msg->retries) 3397 atomic_long_add(msg->retries, 3398 &port->counter_group[CM_XMIT_RETRIES]. 3399 counter[attr_index]); 3400 3401 switch (mad_send_wc->status) { 3402 case IB_WC_SUCCESS: 3403 case IB_WC_WR_FLUSH_ERR: 3404 cm_free_msg(msg); 3405 break; 3406 default: 3407 if (msg->context[0] && msg->context[1]) 3408 cm_process_send_error(msg, mad_send_wc->status); 3409 else 3410 cm_free_msg(msg); 3411 break; 3412 } 3413} 3414 3415static void cm_work_handler(struct work_struct *_work) 3416{ 3417 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3418 int ret; 3419 3420 switch (work->cm_event.event) { 3421 case IB_CM_REQ_RECEIVED: 3422 ret = cm_req_handler(work); 3423 break; 3424 case IB_CM_MRA_RECEIVED: 3425 ret = cm_mra_handler(work); 3426 break; 3427 case IB_CM_REJ_RECEIVED: 3428 ret = cm_rej_handler(work); 3429 break; 3430 case IB_CM_REP_RECEIVED: 3431 ret = cm_rep_handler(work); 3432 break; 3433 case IB_CM_RTU_RECEIVED: 3434 ret = cm_rtu_handler(work); 3435 break; 3436 case IB_CM_USER_ESTABLISHED: 3437 ret = cm_establish_handler(work); 3438 break; 3439 case IB_CM_DREQ_RECEIVED: 3440 ret = cm_dreq_handler(work); 3441 break; 3442 case IB_CM_DREP_RECEIVED: 3443 ret = cm_drep_handler(work); 3444 break; 3445 case IB_CM_SIDR_REQ_RECEIVED: 3446 ret = cm_sidr_req_handler(work); 3447 break; 3448 case IB_CM_SIDR_REP_RECEIVED: 3449 ret = cm_sidr_rep_handler(work); 3450 break; 3451 case IB_CM_LAP_RECEIVED: 3452 ret = cm_lap_handler(work); 3453 break; 3454 case IB_CM_APR_RECEIVED: 3455 ret = cm_apr_handler(work); 3456 break; 3457 case IB_CM_TIMEWAIT_EXIT: 3458 ret = cm_timewait_handler(work); 3459 break; 3460 default: 3461 ret = -EINVAL; 3462 break; 3463 } 3464 if (ret) 3465 cm_free_work(work); 3466} 3467 3468static int cm_establish(struct ib_cm_id *cm_id) 3469{ 3470 struct cm_id_private *cm_id_priv; 3471 struct cm_work *work; 3472 unsigned long flags; 3473 int ret = 0; 3474 struct cm_device *cm_dev; 3475 3476 cm_dev = ib_get_client_data(cm_id->device, &cm_client); 3477 if (!cm_dev) 3478 return -ENODEV; 3479 3480 work = kmalloc(sizeof *work, GFP_ATOMIC); 3481 if (!work) 3482 return -ENOMEM; 3483 3484 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3485 spin_lock_irqsave(&cm_id_priv->lock, flags); 3486 switch (cm_id->state) 3487 { 3488 case IB_CM_REP_SENT: 3489 case IB_CM_MRA_REP_RCVD: 3490 cm_id->state = IB_CM_ESTABLISHED; 3491 break; 3492 case IB_CM_ESTABLISHED: 3493 ret = -EISCONN; 3494 break; 3495 default: 3496 ret = -EINVAL; 3497 break; 3498 } 3499 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3500 3501 if (ret) { 3502 kfree(work); 3503 goto out; 3504 } 3505 3506 /* 3507 * The CM worker thread may try to destroy the cm_id before it 3508 * can execute this work item. To prevent potential deadlock, 3509 * we need to find the cm_id once we're in the context of the 3510 * worker thread, rather than holding a reference on it. 3511 */ 3512 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3513 work->local_id = cm_id->local_id; 3514 work->remote_id = cm_id->remote_id; 3515 work->mad_recv_wc = NULL; 3516 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3517 3518 /* Check if the device started its remove_one */ 3519 spin_lock_irqsave(&cm.lock, flags); 3520 if (!cm_dev->going_down) { 3521 queue_delayed_work(cm.wq, &work->work, 0); 3522 } else { 3523 kfree(work); 3524 ret = -ENODEV; 3525 } 3526 spin_unlock_irqrestore(&cm.lock, flags); 3527 3528out: 3529 return ret; 3530} 3531 3532static int cm_migrate(struct ib_cm_id *cm_id) 3533{ 3534 struct cm_id_private *cm_id_priv; 3535 struct cm_av tmp_av; 3536 unsigned long flags; 3537 int tmp_send_port_not_ready; 3538 int ret = 0; 3539 3540 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3541 spin_lock_irqsave(&cm_id_priv->lock, flags); 3542 if (cm_id->state == IB_CM_ESTABLISHED && 3543 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3544 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3545 cm_id->lap_state = IB_CM_LAP_IDLE; 3546 /* Swap address vector */ 3547 tmp_av = cm_id_priv->av; 3548 cm_id_priv->av = cm_id_priv->alt_av; 3549 cm_id_priv->alt_av = tmp_av; 3550 /* Swap port send ready state */ 3551 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready; 3552 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready; 3553 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready; 3554 } else 3555 ret = -EINVAL; 3556 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3557 3558 return ret; 3559} 3560 3561int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3562{ 3563 int ret; 3564 3565 switch (event) { 3566 case IB_EVENT_COMM_EST: 3567 ret = cm_establish(cm_id); 3568 break; 3569 case IB_EVENT_PATH_MIG: 3570 ret = cm_migrate(cm_id); 3571 break; 3572 default: 3573 ret = -EINVAL; 3574 } 3575 return ret; 3576} 3577EXPORT_SYMBOL(ib_cm_notify); 3578 3579static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3580 struct ib_mad_send_buf *send_buf, 3581 struct ib_mad_recv_wc *mad_recv_wc) 3582{ 3583 struct cm_port *port = mad_agent->context; 3584 struct cm_work *work; 3585 enum ib_cm_event_type event; 3586 u16 attr_id; 3587 int paths = 0; 3588 int going_down = 0; 3589 3590 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3591 case CM_REQ_ATTR_ID: 3592 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3593 alt_local_lid != 0); 3594 event = IB_CM_REQ_RECEIVED; 3595 break; 3596 case CM_MRA_ATTR_ID: 3597 event = IB_CM_MRA_RECEIVED; 3598 break; 3599 case CM_REJ_ATTR_ID: 3600 event = IB_CM_REJ_RECEIVED; 3601 break; 3602 case CM_REP_ATTR_ID: 3603 event = IB_CM_REP_RECEIVED; 3604 break; 3605 case CM_RTU_ATTR_ID: 3606 event = IB_CM_RTU_RECEIVED; 3607 break; 3608 case CM_DREQ_ATTR_ID: 3609 event = IB_CM_DREQ_RECEIVED; 3610 break; 3611 case CM_DREP_ATTR_ID: 3612 event = IB_CM_DREP_RECEIVED; 3613 break; 3614 case CM_SIDR_REQ_ATTR_ID: 3615 event = IB_CM_SIDR_REQ_RECEIVED; 3616 break; 3617 case CM_SIDR_REP_ATTR_ID: 3618 event = IB_CM_SIDR_REP_RECEIVED; 3619 break; 3620 case CM_LAP_ATTR_ID: 3621 paths = 1; 3622 event = IB_CM_LAP_RECEIVED; 3623 break; 3624 case CM_APR_ATTR_ID: 3625 event = IB_CM_APR_RECEIVED; 3626 break; 3627 default: 3628 ib_free_recv_mad(mad_recv_wc); 3629 return; 3630 } 3631 3632 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3633 atomic_long_inc(&port->counter_group[CM_RECV]. 3634 counter[attr_id - CM_ATTR_ID_OFFSET]); 3635 3636 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3637 GFP_KERNEL); 3638 if (!work) { 3639 ib_free_recv_mad(mad_recv_wc); 3640 return; 3641 } 3642 3643 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3644 work->cm_event.event = event; 3645 work->mad_recv_wc = mad_recv_wc; 3646 work->port = port; 3647 3648 /* Check if the device started its remove_one */ 3649 spin_lock_irq(&cm.lock); 3650 if (!port->cm_dev->going_down) 3651 queue_delayed_work(cm.wq, &work->work, 0); 3652 else 3653 going_down = 1; 3654 spin_unlock_irq(&cm.lock); 3655 3656 if (going_down) { 3657 kfree(work); 3658 ib_free_recv_mad(mad_recv_wc); 3659 } 3660} 3661 3662static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3663 struct ib_qp_attr *qp_attr, 3664 int *qp_attr_mask) 3665{ 3666 unsigned long flags; 3667 int ret; 3668 3669 spin_lock_irqsave(&cm_id_priv->lock, flags); 3670 switch (cm_id_priv->id.state) { 3671 case IB_CM_REQ_SENT: 3672 case IB_CM_MRA_REQ_RCVD: 3673 case IB_CM_REQ_RCVD: 3674 case IB_CM_MRA_REQ_SENT: 3675 case IB_CM_REP_RCVD: 3676 case IB_CM_MRA_REP_SENT: 3677 case IB_CM_REP_SENT: 3678 case IB_CM_MRA_REP_RCVD: 3679 case IB_CM_ESTABLISHED: 3680 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3681 IB_QP_PKEY_INDEX | IB_QP_PORT; 3682 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3683 if (cm_id_priv->responder_resources) 3684 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3685 IB_ACCESS_REMOTE_ATOMIC; 3686 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3687 qp_attr->port_num = cm_id_priv->av.port->port_num; 3688 ret = 0; 3689 break; 3690 default: 3691 ret = -EINVAL; 3692 break; 3693 } 3694 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3695 return ret; 3696} 3697 3698static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3699 struct ib_qp_attr *qp_attr, 3700 int *qp_attr_mask) 3701{ 3702 unsigned long flags; 3703 int ret; 3704 3705 spin_lock_irqsave(&cm_id_priv->lock, flags); 3706 switch (cm_id_priv->id.state) { 3707 case IB_CM_REQ_RCVD: 3708 case IB_CM_MRA_REQ_SENT: 3709 case IB_CM_REP_RCVD: 3710 case IB_CM_MRA_REP_SENT: 3711 case IB_CM_REP_SENT: 3712 case IB_CM_MRA_REP_RCVD: 3713 case IB_CM_ESTABLISHED: 3714 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3715 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3716 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3717 qp_attr->path_mtu = cm_id_priv->path_mtu; 3718 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3719 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3720 if (cm_id_priv->qp_type == IB_QPT_RC || 3721 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3722 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3723 IB_QP_MIN_RNR_TIMER; 3724 qp_attr->max_dest_rd_atomic = 3725 cm_id_priv->responder_resources; 3726 qp_attr->min_rnr_timer = 0; 3727 } 3728 if (cm_id_priv->alt_av.ah_attr.dlid) { 3729 *qp_attr_mask |= IB_QP_ALT_PATH; 3730 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3731 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3732 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3733 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3734 } 3735 ret = 0; 3736 break; 3737 default: 3738 ret = -EINVAL; 3739 break; 3740 } 3741 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3742 return ret; 3743} 3744 3745static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3746 struct ib_qp_attr *qp_attr, 3747 int *qp_attr_mask) 3748{ 3749 unsigned long flags; 3750 int ret; 3751 3752 spin_lock_irqsave(&cm_id_priv->lock, flags); 3753 switch (cm_id_priv->id.state) { 3754 /* Allow transition to RTS before sending REP */ 3755 case IB_CM_REQ_RCVD: 3756 case IB_CM_MRA_REQ_SENT: 3757 3758 case IB_CM_REP_RCVD: 3759 case IB_CM_MRA_REP_SENT: 3760 case IB_CM_REP_SENT: 3761 case IB_CM_MRA_REP_RCVD: 3762 case IB_CM_ESTABLISHED: 3763 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3764 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3765 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3766 switch (cm_id_priv->qp_type) { 3767 case IB_QPT_RC: 3768 case IB_QPT_XRC_INI: 3769 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3770 IB_QP_MAX_QP_RD_ATOMIC; 3771 qp_attr->retry_cnt = cm_id_priv->retry_count; 3772 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3773 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3774 /* fall through */ 3775 case IB_QPT_XRC_TGT: 3776 *qp_attr_mask |= IB_QP_TIMEOUT; 3777 qp_attr->timeout = cm_id_priv->av.timeout; 3778 break; 3779 default: 3780 break; 3781 } 3782 if (cm_id_priv->alt_av.ah_attr.dlid) { 3783 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3784 qp_attr->path_mig_state = IB_MIG_REARM; 3785 } 3786 } else { 3787 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3788 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3789 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3790 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3791 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3792 qp_attr->path_mig_state = IB_MIG_REARM; 3793 } 3794 ret = 0; 3795 break; 3796 default: 3797 ret = -EINVAL; 3798 break; 3799 } 3800 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3801 return ret; 3802} 3803 3804int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3805 struct ib_qp_attr *qp_attr, 3806 int *qp_attr_mask) 3807{ 3808 struct cm_id_private *cm_id_priv; 3809 int ret; 3810 3811 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3812 switch (qp_attr->qp_state) { 3813 case IB_QPS_INIT: 3814 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3815 break; 3816 case IB_QPS_RTR: 3817 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3818 break; 3819 case IB_QPS_RTS: 3820 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3821 break; 3822 default: 3823 ret = -EINVAL; 3824 break; 3825 } 3826 return ret; 3827} 3828EXPORT_SYMBOL(ib_cm_init_qp_attr); 3829 3830static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3831 char *buf) 3832{ 3833 struct cm_counter_group *group; 3834 struct cm_counter_attribute *cm_attr; 3835 3836 group = container_of(obj, struct cm_counter_group, obj); 3837 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3838 3839 return sprintf(buf, "%ld\n", 3840 atomic_long_read(&group->counter[cm_attr->index])); 3841} 3842 3843static const struct sysfs_ops cm_counter_ops = { 3844 .show = cm_show_counter 3845}; 3846 3847static struct kobj_type cm_counter_obj_type = { 3848 .sysfs_ops = &cm_counter_ops, 3849 .default_attrs = cm_counter_default_attrs 3850}; 3851 3852static void cm_release_port_obj(struct kobject *obj) 3853{ 3854 struct cm_port *cm_port; 3855 3856 cm_port = container_of(obj, struct cm_port, port_obj); 3857 kfree(cm_port); 3858} 3859 3860static struct kobj_type cm_port_obj_type = { 3861 .release = cm_release_port_obj 3862}; 3863 3864static char *cm_devnode(struct device *dev, umode_t *mode) 3865{ 3866 if (mode) 3867 *mode = 0666; 3868 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3869} 3870 3871struct class cm_class = { 3872 .owner = THIS_MODULE, 3873 .name = "infiniband_cm", 3874 .devnode = cm_devnode, 3875}; 3876EXPORT_SYMBOL(cm_class); 3877 3878static int cm_create_port_fs(struct cm_port *port) 3879{ 3880 int i, ret; 3881 3882 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3883 &port->cm_dev->device->kobj, 3884 "%d", port->port_num); 3885 if (ret) { 3886 kfree(port); 3887 return ret; 3888 } 3889 3890 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3891 ret = kobject_init_and_add(&port->counter_group[i].obj, 3892 &cm_counter_obj_type, 3893 &port->port_obj, 3894 "%s", counter_group_names[i]); 3895 if (ret) 3896 goto error; 3897 } 3898 3899 return 0; 3900 3901error: 3902 while (i--) 3903 kobject_put(&port->counter_group[i].obj); 3904 kobject_put(&port->port_obj); 3905 return ret; 3906 3907} 3908 3909static void cm_remove_port_fs(struct cm_port *port) 3910{ 3911 int i; 3912 3913 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3914 kobject_put(&port->counter_group[i].obj); 3915 3916 kobject_put(&port->port_obj); 3917} 3918 3919static void cm_add_one(struct ib_device *ib_device) 3920{ 3921 struct cm_device *cm_dev; 3922 struct cm_port *port; 3923 struct ib_mad_reg_req reg_req = { 3924 .mgmt_class = IB_MGMT_CLASS_CM, 3925 .mgmt_class_version = IB_CM_CLASS_VERSION, 3926 }; 3927 struct ib_port_modify port_modify = { 3928 .set_port_cap_mask = IB_PORT_CM_SUP 3929 }; 3930 unsigned long flags; 3931 int ret; 3932 int count = 0; 3933 u8 i; 3934 3935 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3936 ib_device->phys_port_cnt, GFP_KERNEL); 3937 if (!cm_dev) 3938 return; 3939 3940 cm_dev->ib_device = ib_device; 3941 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay; 3942 cm_dev->going_down = 0; 3943 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3944 MKDEV(0, 0), NULL, 3945 "%s", ib_device->name); 3946 if (IS_ERR(cm_dev->device)) { 3947 kfree(cm_dev); 3948 return; 3949 } 3950 3951 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3952 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3953 if (!rdma_cap_ib_cm(ib_device, i)) 3954 continue; 3955 3956 port = kzalloc(sizeof *port, GFP_KERNEL); 3957 if (!port) 3958 goto error1; 3959 3960 cm_dev->port[i-1] = port; 3961 port->cm_dev = cm_dev; 3962 port->port_num = i; 3963 3964 INIT_LIST_HEAD(&port->cm_priv_prim_list); 3965 INIT_LIST_HEAD(&port->cm_priv_altr_list); 3966 3967 ret = cm_create_port_fs(port); 3968 if (ret) 3969 goto error1; 3970 3971 port->mad_agent = ib_register_mad_agent(ib_device, i, 3972 IB_QPT_GSI, 3973 ®_req, 3974 0, 3975 cm_send_handler, 3976 cm_recv_handler, 3977 port, 3978 0); 3979 if (IS_ERR(port->mad_agent)) 3980 goto error2; 3981 3982 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3983 if (ret) 3984 goto error3; 3985 3986 count++; 3987 } 3988 3989 if (!count) 3990 goto free; 3991 3992 ib_set_client_data(ib_device, &cm_client, cm_dev); 3993 3994 write_lock_irqsave(&cm.device_lock, flags); 3995 list_add_tail(&cm_dev->list, &cm.device_list); 3996 write_unlock_irqrestore(&cm.device_lock, flags); 3997 return; 3998 3999error3: 4000 ib_unregister_mad_agent(port->mad_agent); 4001error2: 4002 cm_remove_port_fs(port); 4003error1: 4004 port_modify.set_port_cap_mask = 0; 4005 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 4006 while (--i) { 4007 if (!rdma_cap_ib_cm(ib_device, i)) 4008 continue; 4009 4010 port = cm_dev->port[i-1]; 4011 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4012 ib_unregister_mad_agent(port->mad_agent); 4013 cm_remove_port_fs(port); 4014 } 4015free: 4016 device_unregister(cm_dev->device); 4017 kfree(cm_dev); 4018} 4019 4020static void cm_remove_one(struct ib_device *ib_device, void *client_data) 4021{ 4022 struct cm_device *cm_dev = client_data; 4023 struct cm_port *port; 4024 struct cm_id_private *cm_id_priv; 4025 struct ib_mad_agent *cur_mad_agent; 4026 struct ib_port_modify port_modify = { 4027 .clr_port_cap_mask = IB_PORT_CM_SUP 4028 }; 4029 unsigned long flags; 4030 int i; 4031 4032 if (!cm_dev) 4033 return; 4034 4035 write_lock_irqsave(&cm.device_lock, flags); 4036 list_del(&cm_dev->list); 4037 write_unlock_irqrestore(&cm.device_lock, flags); 4038 4039 spin_lock_irq(&cm.lock); 4040 cm_dev->going_down = 1; 4041 spin_unlock_irq(&cm.lock); 4042 4043 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 4044 if (!rdma_cap_ib_cm(ib_device, i)) 4045 continue; 4046 4047 port = cm_dev->port[i-1]; 4048 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 4049 /* Mark all the cm_id's as not valid */ 4050 spin_lock_irq(&cm.lock); 4051 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list) 4052 cm_id_priv->altr_send_port_not_ready = 1; 4053 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list) 4054 cm_id_priv->prim_send_port_not_ready = 1; 4055 spin_unlock_irq(&cm.lock); 4056 /* 4057 * We flush the queue here after the going_down set, this 4058 * verify that no new works will be queued in the recv handler, 4059 * after that we can call the unregister_mad_agent 4060 */ 4061 flush_workqueue(cm.wq); 4062 spin_lock_irq(&cm.state_lock); 4063 cur_mad_agent = port->mad_agent; 4064 port->mad_agent = NULL; 4065 spin_unlock_irq(&cm.state_lock); 4066 ib_unregister_mad_agent(cur_mad_agent); 4067 cm_remove_port_fs(port); 4068 } 4069 4070 device_unregister(cm_dev->device); 4071 kfree(cm_dev); 4072} 4073 4074static int __init ib_cm_init(void) 4075{ 4076 int ret; 4077 4078 memset(&cm, 0, sizeof cm); 4079 INIT_LIST_HEAD(&cm.device_list); 4080 rwlock_init(&cm.device_lock); 4081 spin_lock_init(&cm.lock); 4082 spin_lock_init(&cm.state_lock); 4083 cm.listen_service_table = RB_ROOT; 4084 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 4085 cm.remote_id_table = RB_ROOT; 4086 cm.remote_qp_table = RB_ROOT; 4087 cm.remote_sidr_table = RB_ROOT; 4088 idr_init(&cm.local_id_table); 4089 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 4090 INIT_LIST_HEAD(&cm.timewait_list); 4091 4092 ret = class_register(&cm_class); 4093 if (ret) { 4094 ret = -ENOMEM; 4095 goto error1; 4096 } 4097 4098 cm.wq = create_workqueue("ib_cm"); 4099 if (!cm.wq) { 4100 ret = -ENOMEM; 4101 goto error2; 4102 } 4103 4104 ret = ib_register_client(&cm_client); 4105 if (ret) 4106 goto error3; 4107 4108 return 0; 4109error3: 4110 destroy_workqueue(cm.wq); 4111error2: 4112 class_unregister(&cm_class); 4113error1: 4114 idr_destroy(&cm.local_id_table); 4115 return ret; 4116} 4117 4118static void __exit ib_cm_cleanup(void) 4119{ 4120 struct cm_timewait_info *timewait_info, *tmp; 4121 4122 spin_lock_irq(&cm.lock); 4123 list_for_each_entry(timewait_info, &cm.timewait_list, list) 4124 cancel_delayed_work(&timewait_info->work.work); 4125 spin_unlock_irq(&cm.lock); 4126 4127 ib_unregister_client(&cm_client); 4128 destroy_workqueue(cm.wq); 4129 4130 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 4131 list_del(&timewait_info->list); 4132 kfree(timewait_info); 4133 } 4134 4135 class_unregister(&cm_class); 4136 idr_destroy(&cm.local_id_table); 4137} 4138 4139module_init_order(ib_cm_init, SI_ORDER_SECOND); 4140module_exit_order(ib_cm_cleanup, SI_ORDER_FIRST); 4141 4142