cm.c revision 271127
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/err.h> 40#include <linux/idr.h> 41#include <linux/interrupt.h> 42#include <linux/random.h> 43#include <linux/rbtree.h> 44#include <linux/spinlock.h> 45#include <linux/sysfs.h> 46#include <linux/workqueue.h> 47#include <linux/kdev_t.h> 48#include <linux/string.h> 49 50#include <asm/atomic-long.h> 51 52#include <rdma/ib_cache.h> 53#include <rdma/ib_cm.h> 54#include "cm_msgs.h" 55 56MODULE_AUTHOR("Sean Hefty"); 57MODULE_DESCRIPTION("InfiniBand CM"); 58MODULE_LICENSE("Dual BSD/GPL"); 59 60#define PFX "ib_cm: " 61 62/* 63 * Limit CM message timeouts to something reasonable: 64 * 8 seconds per message, with up to 15 retries 65 */ 66static int max_timeout = 21; 67module_param(max_timeout, int, 0644); 68MODULE_PARM_DESC(max_timeout, "Maximum IB CM per message timeout " 69 "(default=21, or ~8 seconds)"); 70 71static void cm_add_one(struct ib_device *device); 72static void cm_remove_one(struct ib_device *device); 73 74static struct ib_client cm_client = { 75 .name = "cm", 76 .add = cm_add_one, 77 .remove = cm_remove_one 78}; 79 80static struct ib_cm { 81 spinlock_t lock; 82 struct list_head device_list; 83 rwlock_t device_lock; 84 struct rb_root listen_service_table; 85 u64 listen_service_id; 86 /* struct rb_root peer_service_table; todo: fix peer to peer */ 87 struct rb_root remote_qp_table; 88 struct rb_root remote_id_table; 89 struct rb_root remote_sidr_table; 90 struct idr local_id_table; 91 __be32 random_id_operand; 92 struct list_head timewait_list; 93 struct workqueue_struct *wq; 94} cm; 95 96/* Counter indexes ordered by attribute ID */ 97enum { 98 CM_REQ_COUNTER, 99 CM_MRA_COUNTER, 100 CM_REJ_COUNTER, 101 CM_REP_COUNTER, 102 CM_RTU_COUNTER, 103 CM_DREQ_COUNTER, 104 CM_DREP_COUNTER, 105 CM_SIDR_REQ_COUNTER, 106 CM_SIDR_REP_COUNTER, 107 CM_LAP_COUNTER, 108 CM_APR_COUNTER, 109 CM_ATTR_COUNT, 110 CM_ATTR_ID_OFFSET = 0x0010, 111}; 112 113enum { 114 CM_XMIT, 115 CM_XMIT_RETRIES, 116 CM_RECV, 117 CM_RECV_DUPLICATES, 118 CM_COUNTER_GROUPS 119}; 120 121static char const counter_group_names[CM_COUNTER_GROUPS] 122 [sizeof("cm_rx_duplicates")] = { 123 "cm_tx_msgs", "cm_tx_retries", 124 "cm_rx_msgs", "cm_rx_duplicates" 125}; 126 127struct cm_counter_group { 128 struct kobject obj; 129 atomic_long_t counter[CM_ATTR_COUNT]; 130}; 131 132struct cm_counter_attribute { 133 struct attribute attr; 134 int index; 135}; 136 137#define CM_COUNTER_ATTR(_name, _index) \ 138struct cm_counter_attribute cm_##_name##_counter_attr = { \ 139 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 140 .index = _index \ 141} 142 143static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 144static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 145static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 146static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 147static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 148static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 149static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 150static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 151static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 152static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 153static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 154 155static struct attribute *cm_counter_default_attrs[] = { 156 &cm_req_counter_attr.attr, 157 &cm_mra_counter_attr.attr, 158 &cm_rej_counter_attr.attr, 159 &cm_rep_counter_attr.attr, 160 &cm_rtu_counter_attr.attr, 161 &cm_dreq_counter_attr.attr, 162 &cm_drep_counter_attr.attr, 163 &cm_sidr_req_counter_attr.attr, 164 &cm_sidr_rep_counter_attr.attr, 165 &cm_lap_counter_attr.attr, 166 &cm_apr_counter_attr.attr, 167 NULL 168}; 169 170struct cm_port { 171 struct cm_device *cm_dev; 172 struct ib_mad_agent *mad_agent; 173 struct kobject port_obj; 174 u8 port_num; 175 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 176}; 177 178struct cm_device { 179 struct list_head list; 180 struct ib_device *ib_device; 181 struct device *device; 182 u8 ack_delay; 183 struct cm_port *port[0]; 184}; 185 186struct cm_av { 187 struct cm_port *port; 188 union ib_gid dgid; 189 struct ib_ah_attr ah_attr; 190 u16 pkey_index; 191 u8 timeout; 192}; 193 194struct cm_work { 195 struct delayed_work work; 196 struct list_head list; 197 struct cm_port *port; 198 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 199 __be32 local_id; /* Established / timewait */ 200 __be32 remote_id; 201 struct ib_cm_event cm_event; 202 struct ib_sa_path_rec path[0]; 203}; 204 205struct cm_timewait_info { 206 struct cm_work work; /* Must be first. */ 207 struct list_head list; 208 struct rb_node remote_qp_node; 209 struct rb_node remote_id_node; 210 __be64 remote_ca_guid; 211 __be32 remote_qpn; 212 u8 inserted_remote_qp; 213 u8 inserted_remote_id; 214}; 215 216struct cm_id_private { 217 struct ib_cm_id id; 218 219 struct rb_node service_node; 220 struct rb_node sidr_id_node; 221 spinlock_t lock; /* Do not acquire inside cm.lock */ 222 struct completion comp; 223 atomic_t refcount; 224 225 struct ib_mad_send_buf *msg; 226 struct cm_timewait_info *timewait_info; 227 /* todo: use alternate port on send failure */ 228 struct cm_av av; 229 struct cm_av alt_av; 230 struct ib_cm_compare_data *compare_data; 231 232 void *private_data; 233 __be64 tid; 234 __be32 local_qpn; 235 __be32 remote_qpn; 236 enum ib_qp_type qp_type; 237 __be32 sq_psn; 238 __be32 rq_psn; 239 int timeout_ms; 240 enum ib_mtu path_mtu; 241 __be16 pkey; 242 u8 private_data_len; 243 u8 max_cm_retries; 244 u8 peer_to_peer; 245 u8 responder_resources; 246 u8 initiator_depth; 247 u8 retry_count; 248 u8 rnr_retry_count; 249 u8 service_timeout; 250 u8 target_ack_delay; 251 252 struct list_head work_list; 253 atomic_t work_count; 254}; 255 256static void cm_work_handler(struct work_struct *work); 257 258static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 259{ 260 if (atomic_dec_and_test(&cm_id_priv->refcount)) 261 complete(&cm_id_priv->comp); 262} 263 264static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 265 struct ib_mad_send_buf **msg) 266{ 267 struct ib_mad_agent *mad_agent; 268 struct ib_mad_send_buf *m; 269 struct ib_ah *ah; 270 271 mad_agent = cm_id_priv->av.port->mad_agent; 272 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 273 if (IS_ERR(ah)) 274 return PTR_ERR(ah); 275 276 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 277 cm_id_priv->av.pkey_index, 278 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 279 GFP_ATOMIC); 280 if (IS_ERR(m)) { 281 ib_destroy_ah(ah); 282 return PTR_ERR(m); 283 } 284 285 /* Timeout set by caller if response is expected. */ 286 m->ah = ah; 287 m->retries = cm_id_priv->max_cm_retries; 288 289 atomic_inc(&cm_id_priv->refcount); 290 m->context[0] = cm_id_priv; 291 *msg = m; 292 return 0; 293} 294 295static int cm_alloc_response_msg(struct cm_port *port, 296 struct ib_mad_recv_wc *mad_recv_wc, 297 struct ib_mad_send_buf **msg) 298{ 299 struct ib_mad_send_buf *m; 300 struct ib_ah *ah; 301 302 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 303 mad_recv_wc->recv_buf.grh, port->port_num); 304 if (IS_ERR(ah)) 305 return PTR_ERR(ah); 306 307 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 308 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 309 GFP_ATOMIC); 310 if (IS_ERR(m)) { 311 ib_destroy_ah(ah); 312 return PTR_ERR(m); 313 } 314 m->ah = ah; 315 *msg = m; 316 return 0; 317} 318 319static void cm_free_msg(struct ib_mad_send_buf *msg) 320{ 321 ib_destroy_ah(msg->ah); 322 if (msg->context[0]) 323 cm_deref_id(msg->context[0]); 324 ib_free_send_mad(msg); 325} 326 327static void * cm_copy_private_data(const void *private_data, 328 u8 private_data_len) 329{ 330 void *data; 331 332 if (!private_data || !private_data_len) 333 return NULL; 334 335 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 336 if (!data) 337 return ERR_PTR(-ENOMEM); 338 339 return data; 340} 341 342static void cm_set_private_data(struct cm_id_private *cm_id_priv, 343 void *private_data, u8 private_data_len) 344{ 345 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 346 kfree(cm_id_priv->private_data); 347 348 cm_id_priv->private_data = private_data; 349 cm_id_priv->private_data_len = private_data_len; 350} 351 352static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 353 struct ib_grh *grh, struct cm_av *av) 354{ 355 av->port = port; 356 av->pkey_index = wc->pkey_index; 357 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 358 grh, &av->ah_attr); 359} 360 361static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 362{ 363 struct cm_device *cm_dev; 364 struct cm_port *port = NULL; 365 unsigned long flags; 366 int ret; 367 u8 p; 368 369 read_lock_irqsave(&cm.device_lock, flags); 370 list_for_each_entry(cm_dev, &cm.device_list, list) { 371 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 372 &p, NULL)) { 373 port = cm_dev->port[p-1]; 374 break; 375 } 376 } 377 read_unlock_irqrestore(&cm.device_lock, flags); 378 379 if (!port) 380 return -EINVAL; 381 382 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 383 be16_to_cpu(path->pkey), &av->pkey_index); 384 if (ret) 385 return ret; 386 387 av->port = port; 388 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path, 389 &av->ah_attr); 390 av->timeout = path->packet_life_time + 1; 391 return 0; 392} 393 394static int cm_alloc_id(struct cm_id_private *cm_id_priv) 395{ 396 unsigned long flags; 397 int ret, id; 398 static int next_id; 399 400 do { 401 spin_lock_irqsave(&cm.lock, flags); 402 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 403 next_id, &id); 404 if (!ret) 405 next_id = ((unsigned) id + 1) & MAX_ID_MASK; 406 spin_unlock_irqrestore(&cm.lock, flags); 407 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 408 409 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 410 return ret; 411} 412 413static void cm_free_id(__be32 local_id) 414{ 415 spin_lock_irq(&cm.lock); 416 idr_remove(&cm.local_id_table, 417 (__force int) (local_id ^ cm.random_id_operand)); 418 spin_unlock_irq(&cm.lock); 419} 420 421static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 422{ 423 struct cm_id_private *cm_id_priv; 424 425 cm_id_priv = idr_find(&cm.local_id_table, 426 (__force int) (local_id ^ cm.random_id_operand)); 427 if (cm_id_priv) { 428 if (cm_id_priv->id.remote_id == remote_id) 429 atomic_inc(&cm_id_priv->refcount); 430 else 431 cm_id_priv = NULL; 432 } 433 434 return cm_id_priv; 435} 436 437static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 438{ 439 struct cm_id_private *cm_id_priv; 440 441 spin_lock_irq(&cm.lock); 442 cm_id_priv = cm_get_id(local_id, remote_id); 443 spin_unlock_irq(&cm.lock); 444 445 return cm_id_priv; 446} 447 448static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 449{ 450 int i; 451 452 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 453 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 454 ((unsigned long *) mask)[i]; 455} 456 457static int cm_compare_data(struct ib_cm_compare_data *src_data, 458 struct ib_cm_compare_data *dst_data) 459{ 460 u8 src[IB_CM_COMPARE_SIZE]; 461 u8 dst[IB_CM_COMPARE_SIZE]; 462 463 if (!src_data || !dst_data) 464 return 0; 465 466 cm_mask_copy(src, src_data->data, dst_data->mask); 467 cm_mask_copy(dst, dst_data->data, src_data->mask); 468 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 469} 470 471static int cm_compare_private_data(u8 *private_data, 472 struct ib_cm_compare_data *dst_data) 473{ 474 u8 src[IB_CM_COMPARE_SIZE]; 475 476 if (!dst_data) 477 return 0; 478 479 cm_mask_copy(src, private_data, dst_data->mask); 480 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 481} 482 483/* 484 * Trivial helpers to strip endian annotation and compare; the 485 * endianness doesn't actually matter since we just need a stable 486 * order for the RB tree. 487 */ 488static int be32_lt(__be32 a, __be32 b) 489{ 490 return (__force u32) a < (__force u32) b; 491} 492 493static int be32_gt(__be32 a, __be32 b) 494{ 495 return (__force u32) a > (__force u32) b; 496} 497 498static int be64_lt(__be64 a, __be64 b) 499{ 500 return (__force u64) a < (__force u64) b; 501} 502 503static int be64_gt(__be64 a, __be64 b) 504{ 505 return (__force u64) a > (__force u64) b; 506} 507 508static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 509{ 510 struct rb_node **link = &cm.listen_service_table.rb_node; 511 struct rb_node *parent = NULL; 512 struct cm_id_private *cur_cm_id_priv; 513 __be64 service_id = cm_id_priv->id.service_id; 514 __be64 service_mask = cm_id_priv->id.service_mask; 515 int data_cmp; 516 517 while (*link) { 518 parent = *link; 519 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 520 service_node); 521 data_cmp = cm_compare_data(cm_id_priv->compare_data, 522 cur_cm_id_priv->compare_data); 523 if ((cur_cm_id_priv->id.service_mask & service_id) == 524 (service_mask & cur_cm_id_priv->id.service_id) && 525 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 526 !data_cmp) 527 return cur_cm_id_priv; 528 529 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 530 link = &(*link)->rb_left; 531 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 532 link = &(*link)->rb_right; 533 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 534 link = &(*link)->rb_left; 535 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 536 link = &(*link)->rb_right; 537 else if (data_cmp < 0) 538 link = &(*link)->rb_left; 539 else 540 link = &(*link)->rb_right; 541 } 542 rb_link_node(&cm_id_priv->service_node, parent, link); 543 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 544 return NULL; 545} 546 547static struct cm_id_private * cm_find_listen(struct ib_device *device, 548 __be64 service_id, 549 u8 *private_data) 550{ 551 struct rb_node *node = cm.listen_service_table.rb_node; 552 struct cm_id_private *cm_id_priv; 553 int data_cmp; 554 555 while (node) { 556 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 557 data_cmp = cm_compare_private_data(private_data, 558 cm_id_priv->compare_data); 559 if ((cm_id_priv->id.service_mask & service_id) == 560 cm_id_priv->id.service_id && 561 (cm_id_priv->id.device == device) && !data_cmp) 562 return cm_id_priv; 563 564 if (device < cm_id_priv->id.device) 565 node = node->rb_left; 566 else if (device > cm_id_priv->id.device) 567 node = node->rb_right; 568 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 569 node = node->rb_left; 570 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 571 node = node->rb_right; 572 else if (data_cmp < 0) 573 node = node->rb_left; 574 else 575 node = node->rb_right; 576 } 577 return NULL; 578} 579 580static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 581 *timewait_info) 582{ 583 struct rb_node **link = &cm.remote_id_table.rb_node; 584 struct rb_node *parent = NULL; 585 struct cm_timewait_info *cur_timewait_info; 586 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 587 __be32 remote_id = timewait_info->work.remote_id; 588 589 while (*link) { 590 parent = *link; 591 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 592 remote_id_node); 593 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 594 link = &(*link)->rb_left; 595 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 596 link = &(*link)->rb_right; 597 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 598 link = &(*link)->rb_left; 599 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 600 link = &(*link)->rb_right; 601 else 602 return cur_timewait_info; 603 } 604 timewait_info->inserted_remote_id = 1; 605 rb_link_node(&timewait_info->remote_id_node, parent, link); 606 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 607 return NULL; 608} 609 610static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 611 __be32 remote_id) 612{ 613 struct rb_node *node = cm.remote_id_table.rb_node; 614 struct cm_timewait_info *timewait_info; 615 616 while (node) { 617 timewait_info = rb_entry(node, struct cm_timewait_info, 618 remote_id_node); 619 if (be32_lt(remote_id, timewait_info->work.remote_id)) 620 node = node->rb_left; 621 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 622 node = node->rb_right; 623 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 624 node = node->rb_left; 625 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 626 node = node->rb_right; 627 else 628 return timewait_info; 629 } 630 return NULL; 631} 632 633static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 634 *timewait_info) 635{ 636 struct rb_node **link = &cm.remote_qp_table.rb_node; 637 struct rb_node *parent = NULL; 638 struct cm_timewait_info *cur_timewait_info; 639 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 640 __be32 remote_qpn = timewait_info->remote_qpn; 641 642 while (*link) { 643 parent = *link; 644 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 645 remote_qp_node); 646 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 647 link = &(*link)->rb_left; 648 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 649 link = &(*link)->rb_right; 650 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 651 link = &(*link)->rb_left; 652 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 653 link = &(*link)->rb_right; 654 else 655 return cur_timewait_info; 656 } 657 timewait_info->inserted_remote_qp = 1; 658 rb_link_node(&timewait_info->remote_qp_node, parent, link); 659 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 660 return NULL; 661} 662 663static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 664 *cm_id_priv) 665{ 666 struct rb_node **link = &cm.remote_sidr_table.rb_node; 667 struct rb_node *parent = NULL; 668 struct cm_id_private *cur_cm_id_priv; 669 union ib_gid *port_gid = &cm_id_priv->av.dgid; 670 __be32 remote_id = cm_id_priv->id.remote_id; 671 672 while (*link) { 673 parent = *link; 674 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 675 sidr_id_node); 676 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 677 link = &(*link)->rb_left; 678 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 679 link = &(*link)->rb_right; 680 else { 681 int cmp; 682 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 683 sizeof *port_gid); 684 if (cmp < 0) 685 link = &(*link)->rb_left; 686 else if (cmp > 0) 687 link = &(*link)->rb_right; 688 else 689 return cur_cm_id_priv; 690 } 691 } 692 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 693 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 694 return NULL; 695} 696 697static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 698 enum ib_cm_sidr_status status) 699{ 700 struct ib_cm_sidr_rep_param param; 701 702 memset(¶m, 0, sizeof param); 703 param.status = status; 704 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 705} 706 707struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 708 ib_cm_handler cm_handler, 709 void *context) 710{ 711 struct cm_id_private *cm_id_priv; 712 int ret; 713 714 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 715 if (!cm_id_priv) 716 return ERR_PTR(-ENOMEM); 717 718 cm_id_priv->id.state = IB_CM_IDLE; 719 cm_id_priv->id.device = device; 720 cm_id_priv->id.cm_handler = cm_handler; 721 cm_id_priv->id.context = context; 722 cm_id_priv->id.remote_cm_qpn = 1; 723 ret = cm_alloc_id(cm_id_priv); 724 if (ret) 725 goto error; 726 727 spin_lock_init(&cm_id_priv->lock); 728 init_completion(&cm_id_priv->comp); 729 INIT_LIST_HEAD(&cm_id_priv->work_list); 730 atomic_set(&cm_id_priv->work_count, -1); 731 atomic_set(&cm_id_priv->refcount, 1); 732 return &cm_id_priv->id; 733 734error: 735 kfree(cm_id_priv); 736 return ERR_PTR(-ENOMEM); 737} 738EXPORT_SYMBOL(ib_create_cm_id); 739 740static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 741{ 742 struct cm_work *work; 743 744 if (list_empty(&cm_id_priv->work_list)) 745 return NULL; 746 747 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 748 list_del(&work->list); 749 return work; 750} 751 752static void cm_free_work(struct cm_work *work) 753{ 754 if (work->mad_recv_wc) 755 ib_free_recv_mad(work->mad_recv_wc); 756 kfree(work); 757} 758 759static inline int cm_convert_to_ms(int iba_time) 760{ 761 /* approximate conversion to ms from 4.096us x 2^iba_time */ 762 return 1 << max(iba_time - 8, 0); 763} 764 765/* 766 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 767 * Because of how ack_timeout is stored, adding one doubles the timeout. 768 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 769 * increment it (round up) only if the other is within 50%. 770 */ 771static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 772{ 773 int ack_timeout = packet_life_time + 1; 774 775 if (ack_timeout >= ca_ack_delay) 776 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 777 else 778 ack_timeout = ca_ack_delay + 779 (ack_timeout >= (ca_ack_delay - 1)); 780 781 return min(31, ack_timeout); 782} 783 784static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 785{ 786 if (timewait_info->inserted_remote_id) { 787 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 788 timewait_info->inserted_remote_id = 0; 789 } 790 791 if (timewait_info->inserted_remote_qp) { 792 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 793 timewait_info->inserted_remote_qp = 0; 794 } 795} 796 797static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 798{ 799 struct cm_timewait_info *timewait_info; 800 801 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 802 if (!timewait_info) 803 return ERR_PTR(-ENOMEM); 804 805 timewait_info->work.local_id = local_id; 806 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 807 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 808 return timewait_info; 809} 810 811static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 812{ 813 int wait_time; 814 unsigned long flags; 815 816 spin_lock_irqsave(&cm.lock, flags); 817 cm_cleanup_timewait(cm_id_priv->timewait_info); 818 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 819 spin_unlock_irqrestore(&cm.lock, flags); 820 821 /* 822 * The cm_id could be destroyed by the user before we exit timewait. 823 * To protect against this, we search for the cm_id after exiting 824 * timewait before notifying the user that we've exited timewait. 825 */ 826 cm_id_priv->id.state = IB_CM_TIMEWAIT; 827 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 828 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 829 msecs_to_jiffies(wait_time)); 830 cm_id_priv->timewait_info = NULL; 831} 832 833static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 834{ 835 unsigned long flags; 836 837 cm_id_priv->id.state = IB_CM_IDLE; 838 if (cm_id_priv->timewait_info) { 839 spin_lock_irqsave(&cm.lock, flags); 840 cm_cleanup_timewait(cm_id_priv->timewait_info); 841 spin_unlock_irqrestore(&cm.lock, flags); 842 kfree(cm_id_priv->timewait_info); 843 cm_id_priv->timewait_info = NULL; 844 } 845} 846 847static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 848{ 849 struct cm_id_private *cm_id_priv; 850 struct cm_work *work; 851 852 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 853retest: 854 spin_lock_irq(&cm_id_priv->lock); 855 switch (cm_id->state) { 856 case IB_CM_LISTEN: 857 cm_id->state = IB_CM_IDLE; 858 spin_unlock_irq(&cm_id_priv->lock); 859 spin_lock_irq(&cm.lock); 860 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 861 spin_unlock_irq(&cm.lock); 862 break; 863 case IB_CM_SIDR_REQ_SENT: 864 cm_id->state = IB_CM_IDLE; 865 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 866 spin_unlock_irq(&cm_id_priv->lock); 867 break; 868 case IB_CM_SIDR_REQ_RCVD: 869 spin_unlock_irq(&cm_id_priv->lock); 870 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 871 break; 872 case IB_CM_REQ_SENT: 873 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 874 spin_unlock_irq(&cm_id_priv->lock); 875 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 876 &cm_id_priv->id.device->node_guid, 877 sizeof cm_id_priv->id.device->node_guid, 878 NULL, 0); 879 break; 880 case IB_CM_REQ_RCVD: 881 if (err == -ENOMEM) { 882 /* Do not reject to allow future retries. */ 883 cm_reset_to_idle(cm_id_priv); 884 spin_unlock_irq(&cm_id_priv->lock); 885 } else { 886 spin_unlock_irq(&cm_id_priv->lock); 887 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 888 NULL, 0, NULL, 0); 889 } 890 break; 891 case IB_CM_MRA_REQ_RCVD: 892 case IB_CM_REP_SENT: 893 case IB_CM_MRA_REP_RCVD: 894 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 895 /* Fall through */ 896 case IB_CM_MRA_REQ_SENT: 897 case IB_CM_REP_RCVD: 898 case IB_CM_MRA_REP_SENT: 899 spin_unlock_irq(&cm_id_priv->lock); 900 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 901 NULL, 0, NULL, 0); 902 break; 903 case IB_CM_ESTABLISHED: 904 spin_unlock_irq(&cm_id_priv->lock); 905 ib_send_cm_dreq(cm_id, NULL, 0); 906 goto retest; 907 case IB_CM_DREQ_SENT: 908 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 909 cm_enter_timewait(cm_id_priv); 910 spin_unlock_irq(&cm_id_priv->lock); 911 break; 912 case IB_CM_DREQ_RCVD: 913 spin_unlock_irq(&cm_id_priv->lock); 914 ib_send_cm_drep(cm_id, NULL, 0); 915 break; 916 default: 917 spin_unlock_irq(&cm_id_priv->lock); 918 break; 919 } 920 921 cm_free_id(cm_id->local_id); 922 cm_deref_id(cm_id_priv); 923 wait_for_completion(&cm_id_priv->comp); 924 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 925 cm_free_work(work); 926 kfree(cm_id_priv->compare_data); 927 kfree(cm_id_priv->private_data); 928 kfree(cm_id_priv); 929} 930 931void ib_destroy_cm_id(struct ib_cm_id *cm_id) 932{ 933 cm_destroy_id(cm_id, 0); 934} 935EXPORT_SYMBOL(ib_destroy_cm_id); 936 937int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 938 struct ib_cm_compare_data *compare_data) 939{ 940 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 941 unsigned long flags; 942 int ret = 0; 943 944 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 945 service_id &= service_mask; 946 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 947 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 948 return -EINVAL; 949 950 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 951 if (cm_id->state != IB_CM_IDLE) 952 return -EINVAL; 953 954 if (compare_data) { 955 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 956 GFP_KERNEL); 957 if (!cm_id_priv->compare_data) 958 return -ENOMEM; 959 cm_mask_copy(cm_id_priv->compare_data->data, 960 compare_data->data, compare_data->mask); 961 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 962 IB_CM_COMPARE_SIZE); 963 } 964 965 cm_id->state = IB_CM_LISTEN; 966 967 spin_lock_irqsave(&cm.lock, flags); 968 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 969 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 970 cm_id->service_mask = ~cpu_to_be64(0); 971 } else { 972 cm_id->service_id = service_id; 973 cm_id->service_mask = service_mask; 974 } 975 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 976 spin_unlock_irqrestore(&cm.lock, flags); 977 978 if (cur_cm_id_priv) { 979 cm_id->state = IB_CM_IDLE; 980 kfree(cm_id_priv->compare_data); 981 cm_id_priv->compare_data = NULL; 982 ret = -EBUSY; 983 } 984 return ret; 985} 986EXPORT_SYMBOL(ib_cm_listen); 987 988static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 989 enum cm_msg_sequence msg_seq) 990{ 991 u64 hi_tid, low_tid; 992 993 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 994 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 995 (msg_seq << 30)); 996 return cpu_to_be64(hi_tid | low_tid); 997} 998 999static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 1000 __be16 attr_id, __be64 tid) 1001{ 1002 hdr->base_version = IB_MGMT_BASE_VERSION; 1003 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1004 hdr->class_version = IB_CM_CLASS_VERSION; 1005 hdr->method = IB_MGMT_METHOD_SEND; 1006 hdr->attr_id = attr_id; 1007 hdr->tid = tid; 1008} 1009 1010static void cm_format_req(struct cm_req_msg *req_msg, 1011 struct cm_id_private *cm_id_priv, 1012 struct ib_cm_req_param *param) 1013{ 1014 struct ib_sa_path_rec *pri_path = param->primary_path; 1015 struct ib_sa_path_rec *alt_path = param->alternate_path; 1016 1017 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1018 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1019 1020 req_msg->local_comm_id = cm_id_priv->id.local_id; 1021 req_msg->service_id = param->service_id; 1022 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1023 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1024 cm_req_set_resp_res(req_msg, param->responder_resources); 1025 cm_req_set_init_depth(req_msg, param->initiator_depth); 1026 cm_req_set_remote_resp_timeout(req_msg, 1027 param->remote_cm_response_timeout); 1028 if (param->remote_cm_response_timeout > (u8) max_timeout) { 1029 printk(KERN_WARNING PFX "req remote_cm_response_timeout %d > " 1030 "%d, decreasing\n", param->remote_cm_response_timeout, 1031 max_timeout); 1032 cm_req_set_remote_resp_timeout(req_msg, (u8) max_timeout); 1033 } 1034 cm_req_set_qp_type(req_msg, param->qp_type); 1035 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1036 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1037 cm_req_set_local_resp_timeout(req_msg, 1038 param->local_cm_response_timeout); 1039 if (param->local_cm_response_timeout > (u8) max_timeout) { 1040 printk(KERN_WARNING PFX "req local_cm_response_timeout %d > " 1041 "%d, decreasing\n", param->local_cm_response_timeout, 1042 max_timeout); 1043 cm_req_set_local_resp_timeout(req_msg, (u8) max_timeout); 1044 } 1045 cm_req_set_retry_count(req_msg, param->retry_count); 1046 req_msg->pkey = param->primary_path->pkey; 1047 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1048 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1049 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1050 cm_req_set_srq(req_msg, param->srq); 1051 1052 if (pri_path->hop_limit <= 1) { 1053 req_msg->primary_local_lid = pri_path->slid; 1054 req_msg->primary_remote_lid = pri_path->dlid; 1055 } else { 1056 /* Work-around until there's a way to obtain remote LID info */ 1057 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1058 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1059 } 1060 req_msg->primary_local_gid = pri_path->sgid; 1061 req_msg->primary_remote_gid = pri_path->dgid; 1062 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1063 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1064 req_msg->primary_traffic_class = pri_path->traffic_class; 1065 req_msg->primary_hop_limit = pri_path->hop_limit; 1066 cm_req_set_primary_sl(req_msg, pri_path->sl); 1067 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1068 cm_req_set_primary_local_ack_timeout(req_msg, 1069 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1070 pri_path->packet_life_time)); 1071 1072 if (alt_path) { 1073 if (alt_path->hop_limit <= 1) { 1074 req_msg->alt_local_lid = alt_path->slid; 1075 req_msg->alt_remote_lid = alt_path->dlid; 1076 } else { 1077 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1078 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1079 } 1080 req_msg->alt_local_gid = alt_path->sgid; 1081 req_msg->alt_remote_gid = alt_path->dgid; 1082 cm_req_set_alt_flow_label(req_msg, 1083 alt_path->flow_label); 1084 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1085 req_msg->alt_traffic_class = alt_path->traffic_class; 1086 req_msg->alt_hop_limit = alt_path->hop_limit; 1087 cm_req_set_alt_sl(req_msg, alt_path->sl); 1088 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1089 cm_req_set_alt_local_ack_timeout(req_msg, 1090 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1091 alt_path->packet_life_time)); 1092 } 1093 1094 if (param->private_data && param->private_data_len) 1095 memcpy(req_msg->private_data, param->private_data, 1096 param->private_data_len); 1097} 1098 1099static int cm_validate_req_param(struct ib_cm_req_param *param) 1100{ 1101 /* peer-to-peer not supported */ 1102 if (param->peer_to_peer) 1103 return -EINVAL; 1104 1105 if (!param->primary_path) 1106 return -EINVAL; 1107 1108 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 1109 return -EINVAL; 1110 1111 if (param->private_data && 1112 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1113 return -EINVAL; 1114 1115 if (param->alternate_path && 1116 (param->alternate_path->pkey != param->primary_path->pkey || 1117 param->alternate_path->mtu != param->primary_path->mtu)) 1118 return -EINVAL; 1119 1120 return 0; 1121} 1122 1123int ib_send_cm_req(struct ib_cm_id *cm_id, 1124 struct ib_cm_req_param *param) 1125{ 1126 struct cm_id_private *cm_id_priv; 1127 struct cm_req_msg *req_msg; 1128 unsigned long flags; 1129 int ret; 1130 1131 ret = cm_validate_req_param(param); 1132 if (ret) 1133 return ret; 1134 1135 /* Verify that we're not in timewait. */ 1136 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1137 spin_lock_irqsave(&cm_id_priv->lock, flags); 1138 if (cm_id->state != IB_CM_IDLE) { 1139 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1140 ret = -EINVAL; 1141 goto out; 1142 } 1143 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1144 1145 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1146 id.local_id); 1147 if (IS_ERR(cm_id_priv->timewait_info)) { 1148 ret = PTR_ERR(cm_id_priv->timewait_info); 1149 goto out; 1150 } 1151 1152 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1153 if (ret) 1154 goto error1; 1155 if (param->alternate_path) { 1156 ret = cm_init_av_by_path(param->alternate_path, 1157 &cm_id_priv->alt_av); 1158 if (ret) 1159 goto error1; 1160 } 1161 cm_id->service_id = param->service_id; 1162 cm_id->service_mask = ~cpu_to_be64(0); 1163 cm_id_priv->timeout_ms = cm_convert_to_ms( 1164 param->primary_path->packet_life_time) * 2 + 1165 cm_convert_to_ms( 1166 param->remote_cm_response_timeout); 1167 if (cm_id_priv->timeout_ms > cm_convert_to_ms(max_timeout)) { 1168 printk(KERN_WARNING PFX "req timeout_ms %d > %d, decreasing\n", 1169 cm_id_priv->timeout_ms, cm_convert_to_ms(max_timeout)); 1170 cm_id_priv->timeout_ms = cm_convert_to_ms(max_timeout); 1171 } 1172 cm_id_priv->max_cm_retries = param->max_cm_retries; 1173 cm_id_priv->initiator_depth = param->initiator_depth; 1174 cm_id_priv->responder_resources = param->responder_resources; 1175 cm_id_priv->retry_count = param->retry_count; 1176 cm_id_priv->path_mtu = param->primary_path->mtu; 1177 cm_id_priv->pkey = param->primary_path->pkey; 1178 cm_id_priv->qp_type = param->qp_type; 1179 1180 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1181 if (ret) 1182 goto error1; 1183 1184 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1185 cm_format_req(req_msg, cm_id_priv, param); 1186 cm_id_priv->tid = req_msg->hdr.tid; 1187 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1188 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1189 1190 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1191 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1192 1193 spin_lock_irqsave(&cm_id_priv->lock, flags); 1194 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1195 if (ret) { 1196 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1197 goto error2; 1198 } 1199 BUG_ON(cm_id->state != IB_CM_IDLE); 1200 cm_id->state = IB_CM_REQ_SENT; 1201 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1202 return 0; 1203 1204error2: cm_free_msg(cm_id_priv->msg); 1205error1: kfree(cm_id_priv->timewait_info); 1206out: return ret; 1207} 1208EXPORT_SYMBOL(ib_send_cm_req); 1209 1210static int cm_issue_rej(struct cm_port *port, 1211 struct ib_mad_recv_wc *mad_recv_wc, 1212 enum ib_cm_rej_reason reason, 1213 enum cm_msg_response msg_rejected, 1214 void *ari, u8 ari_length) 1215{ 1216 struct ib_mad_send_buf *msg = NULL; 1217 struct cm_rej_msg *rej_msg, *rcv_msg; 1218 int ret; 1219 1220 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1221 if (ret) 1222 return ret; 1223 1224 /* We just need common CM header information. Cast to any message. */ 1225 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1226 rej_msg = (struct cm_rej_msg *) msg->mad; 1227 1228 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1229 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1230 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1231 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1232 rej_msg->reason = cpu_to_be16(reason); 1233 1234 if (ari && ari_length) { 1235 cm_rej_set_reject_info_len(rej_msg, ari_length); 1236 memcpy(rej_msg->ari, ari, ari_length); 1237 } 1238 1239 ret = ib_post_send_mad(msg, NULL); 1240 if (ret) 1241 cm_free_msg(msg); 1242 1243 return ret; 1244} 1245 1246static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1247 __be32 local_qpn, __be32 remote_qpn) 1248{ 1249 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1250 ((local_ca_guid == remote_ca_guid) && 1251 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1252} 1253 1254static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1255 struct ib_sa_path_rec *primary_path, 1256 struct ib_sa_path_rec *alt_path) 1257{ 1258 memset(primary_path, 0, sizeof *primary_path); 1259 primary_path->dgid = req_msg->primary_local_gid; 1260 primary_path->sgid = req_msg->primary_remote_gid; 1261 primary_path->dlid = req_msg->primary_local_lid; 1262 primary_path->slid = req_msg->primary_remote_lid; 1263 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1264 primary_path->hop_limit = req_msg->primary_hop_limit; 1265 primary_path->traffic_class = req_msg->primary_traffic_class; 1266 primary_path->reversible = 1; 1267 primary_path->pkey = req_msg->pkey; 1268 primary_path->sl = cm_req_get_primary_sl(req_msg); 1269 primary_path->mtu_selector = IB_SA_EQ; 1270 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1271 primary_path->rate_selector = IB_SA_EQ; 1272 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1273 primary_path->packet_life_time_selector = IB_SA_EQ; 1274 primary_path->packet_life_time = 1275 cm_req_get_primary_local_ack_timeout(req_msg); 1276 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1277 1278 if (req_msg->alt_local_lid) { 1279 memset(alt_path, 0, sizeof *alt_path); 1280 alt_path->dgid = req_msg->alt_local_gid; 1281 alt_path->sgid = req_msg->alt_remote_gid; 1282 alt_path->dlid = req_msg->alt_local_lid; 1283 alt_path->slid = req_msg->alt_remote_lid; 1284 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1285 alt_path->hop_limit = req_msg->alt_hop_limit; 1286 alt_path->traffic_class = req_msg->alt_traffic_class; 1287 alt_path->reversible = 1; 1288 alt_path->pkey = req_msg->pkey; 1289 alt_path->sl = cm_req_get_alt_sl(req_msg); 1290 alt_path->mtu_selector = IB_SA_EQ; 1291 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1292 alt_path->rate_selector = IB_SA_EQ; 1293 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1294 alt_path->packet_life_time_selector = IB_SA_EQ; 1295 alt_path->packet_life_time = 1296 cm_req_get_alt_local_ack_timeout(req_msg); 1297 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1298 } 1299} 1300 1301static void cm_format_req_event(struct cm_work *work, 1302 struct cm_id_private *cm_id_priv, 1303 struct ib_cm_id *listen_id) 1304{ 1305 struct cm_req_msg *req_msg; 1306 struct ib_cm_req_event_param *param; 1307 1308 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1309 param = &work->cm_event.param.req_rcvd; 1310 param->listen_id = listen_id; 1311 param->port = cm_id_priv->av.port->port_num; 1312 param->primary_path = &work->path[0]; 1313 if (req_msg->alt_local_lid) 1314 param->alternate_path = &work->path[1]; 1315 else 1316 param->alternate_path = NULL; 1317 param->remote_ca_guid = req_msg->local_ca_guid; 1318 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1319 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1320 param->qp_type = cm_req_get_qp_type(req_msg); 1321 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1322 param->responder_resources = cm_req_get_init_depth(req_msg); 1323 param->initiator_depth = cm_req_get_resp_res(req_msg); 1324 param->local_cm_response_timeout = 1325 cm_req_get_remote_resp_timeout(req_msg); 1326 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1327 param->remote_cm_response_timeout = 1328 cm_req_get_local_resp_timeout(req_msg); 1329 param->retry_count = cm_req_get_retry_count(req_msg); 1330 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1331 param->srq = cm_req_get_srq(req_msg); 1332 work->cm_event.private_data = &req_msg->private_data; 1333} 1334 1335static void cm_process_work(struct cm_id_private *cm_id_priv, 1336 struct cm_work *work) 1337{ 1338 int ret; 1339 1340 /* We will typically only have the current event to report. */ 1341 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1342 cm_free_work(work); 1343 1344 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1345 spin_lock_irq(&cm_id_priv->lock); 1346 work = cm_dequeue_work(cm_id_priv); 1347 spin_unlock_irq(&cm_id_priv->lock); 1348 BUG_ON(!work); 1349 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1350 &work->cm_event); 1351 cm_free_work(work); 1352 } 1353 cm_deref_id(cm_id_priv); 1354 if (ret) 1355 cm_destroy_id(&cm_id_priv->id, ret); 1356} 1357 1358static void cm_format_mra(struct cm_mra_msg *mra_msg, 1359 struct cm_id_private *cm_id_priv, 1360 enum cm_msg_response msg_mraed, u8 service_timeout, 1361 const void *private_data, u8 private_data_len) 1362{ 1363 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1364 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1365 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1366 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1367 cm_mra_set_service_timeout(mra_msg, service_timeout); 1368 1369 if (private_data && private_data_len) 1370 memcpy(mra_msg->private_data, private_data, private_data_len); 1371} 1372 1373static void cm_format_rej(struct cm_rej_msg *rej_msg, 1374 struct cm_id_private *cm_id_priv, 1375 enum ib_cm_rej_reason reason, 1376 void *ari, 1377 u8 ari_length, 1378 const void *private_data, 1379 u8 private_data_len) 1380{ 1381 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1382 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1383 1384 switch(cm_id_priv->id.state) { 1385 case IB_CM_REQ_RCVD: 1386 rej_msg->local_comm_id = 0; 1387 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1388 break; 1389 case IB_CM_MRA_REQ_SENT: 1390 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1391 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1392 break; 1393 case IB_CM_REP_RCVD: 1394 case IB_CM_MRA_REP_SENT: 1395 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1396 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1397 break; 1398 default: 1399 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1400 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1401 break; 1402 } 1403 1404 rej_msg->reason = cpu_to_be16(reason); 1405 if (ari && ari_length) { 1406 cm_rej_set_reject_info_len(rej_msg, ari_length); 1407 memcpy(rej_msg->ari, ari, ari_length); 1408 } 1409 1410 if (private_data && private_data_len) 1411 memcpy(rej_msg->private_data, private_data, private_data_len); 1412} 1413 1414static void cm_dup_req_handler(struct cm_work *work, 1415 struct cm_id_private *cm_id_priv) 1416{ 1417 struct ib_mad_send_buf *msg = NULL; 1418 int ret; 1419 1420 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1421 counter[CM_REQ_COUNTER]); 1422 1423 /* Quick state check to discard duplicate REQs. */ 1424 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1425 return; 1426 1427 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1428 if (ret) 1429 return; 1430 1431 spin_lock_irq(&cm_id_priv->lock); 1432 switch (cm_id_priv->id.state) { 1433 case IB_CM_MRA_REQ_SENT: 1434 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1435 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1436 cm_id_priv->private_data, 1437 cm_id_priv->private_data_len); 1438 break; 1439 case IB_CM_TIMEWAIT: 1440 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1441 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1442 break; 1443 default: 1444 goto unlock; 1445 } 1446 spin_unlock_irq(&cm_id_priv->lock); 1447 1448 ret = ib_post_send_mad(msg, NULL); 1449 if (ret) 1450 goto free; 1451 return; 1452 1453unlock: spin_unlock_irq(&cm_id_priv->lock); 1454free: cm_free_msg(msg); 1455} 1456 1457static struct cm_id_private * cm_match_req(struct cm_work *work, 1458 struct cm_id_private *cm_id_priv) 1459{ 1460 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1461 struct cm_timewait_info *timewait_info; 1462 struct cm_req_msg *req_msg; 1463 1464 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1465 1466 /* Check for possible duplicate REQ. */ 1467 spin_lock_irq(&cm.lock); 1468 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1469 if (timewait_info) { 1470 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1471 timewait_info->work.remote_id); 1472 spin_unlock_irq(&cm.lock); 1473 if (cur_cm_id_priv) { 1474 cm_dup_req_handler(work, cur_cm_id_priv); 1475 cm_deref_id(cur_cm_id_priv); 1476 } 1477 return NULL; 1478 } 1479 1480 /* Check for stale connections. */ 1481 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1482 if (timewait_info) { 1483 cm_cleanup_timewait(cm_id_priv->timewait_info); 1484 spin_unlock_irq(&cm.lock); 1485 cm_issue_rej(work->port, work->mad_recv_wc, 1486 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1487 NULL, 0); 1488 return NULL; 1489 } 1490 1491 /* Find matching listen request. */ 1492 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1493 req_msg->service_id, 1494 req_msg->private_data); 1495 if (!listen_cm_id_priv) { 1496 cm_cleanup_timewait(cm_id_priv->timewait_info); 1497 spin_unlock_irq(&cm.lock); 1498 cm_issue_rej(work->port, work->mad_recv_wc, 1499 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1500 NULL, 0); 1501 goto out; 1502 } 1503 atomic_inc(&listen_cm_id_priv->refcount); 1504 atomic_inc(&cm_id_priv->refcount); 1505 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1506 atomic_inc(&cm_id_priv->work_count); 1507 spin_unlock_irq(&cm.lock); 1508out: 1509 return listen_cm_id_priv; 1510} 1511 1512/* 1513 * Work-around for inter-subnet connections. If the LIDs are permissive, 1514 * we need to override the LID/SL data in the REQ with the LID information 1515 * in the work completion. 1516 */ 1517static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1518{ 1519 if (!cm_req_get_primary_subnet_local(req_msg)) { 1520 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1521 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1522 cm_req_set_primary_sl(req_msg, wc->sl); 1523 } 1524 1525 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1526 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1527 } 1528 1529 if (!cm_req_get_alt_subnet_local(req_msg)) { 1530 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1531 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1532 cm_req_set_alt_sl(req_msg, wc->sl); 1533 } 1534 1535 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1536 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1537 } 1538} 1539 1540static int cm_req_handler(struct cm_work *work) 1541{ 1542 struct ib_cm_id *cm_id; 1543 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1544 struct cm_req_msg *req_msg; 1545 int ret; 1546 1547 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1548 1549 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1550 if (IS_ERR(cm_id)) 1551 return PTR_ERR(cm_id); 1552 1553 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1554 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1555 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1556 work->mad_recv_wc->recv_buf.grh, 1557 &cm_id_priv->av); 1558 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1559 id.local_id); 1560 if (IS_ERR(cm_id_priv->timewait_info)) { 1561 ret = PTR_ERR(cm_id_priv->timewait_info); 1562 goto destroy; 1563 } 1564 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1565 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1566 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1567 1568 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1569 if (!listen_cm_id_priv) { 1570 ret = -EINVAL; 1571 kfree(cm_id_priv->timewait_info); 1572 goto destroy; 1573 } 1574 1575 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1576 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1577 cm_id_priv->id.service_id = req_msg->service_id; 1578 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1579 1580 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1581 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1582 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1583 if (ret) { 1584 ib_get_cached_gid(work->port->cm_dev->ib_device, 1585 work->port->port_num, 0, &work->path[0].sgid); 1586 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1587 &work->path[0].sgid, sizeof work->path[0].sgid, 1588 NULL, 0); 1589 goto rejected; 1590 } 1591 if (req_msg->alt_local_lid) { 1592 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1593 if (ret) { 1594 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1595 &work->path[0].sgid, 1596 sizeof work->path[0].sgid, NULL, 0); 1597 goto rejected; 1598 } 1599 } 1600 cm_id_priv->tid = req_msg->hdr.tid; 1601 cm_id_priv->timeout_ms = cm_convert_to_ms( 1602 cm_req_get_local_resp_timeout(req_msg)); 1603 if (cm_req_get_local_resp_timeout(req_msg) > (u8) max_timeout) { 1604 printk(KERN_WARNING PFX "rcvd cm_local_resp_timeout %d > %d, " 1605 "decreasing used timeout_ms\n", 1606 cm_req_get_local_resp_timeout(req_msg), max_timeout); 1607 cm_id_priv->timeout_ms = cm_convert_to_ms(max_timeout); 1608 } 1609 1610 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1611 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1612 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1613 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1614 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1615 cm_id_priv->pkey = req_msg->pkey; 1616 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1617 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1618 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1619 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1620 1621 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1622 cm_process_work(cm_id_priv, work); 1623 cm_deref_id(listen_cm_id_priv); 1624 return 0; 1625 1626rejected: 1627 atomic_dec(&cm_id_priv->refcount); 1628 cm_deref_id(listen_cm_id_priv); 1629destroy: 1630 ib_destroy_cm_id(cm_id); 1631 return ret; 1632} 1633 1634static void cm_format_rep(struct cm_rep_msg *rep_msg, 1635 struct cm_id_private *cm_id_priv, 1636 struct ib_cm_rep_param *param) 1637{ 1638 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1639 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1640 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1641 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1642 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1643 rep_msg->resp_resources = param->responder_resources; 1644 rep_msg->initiator_depth = param->initiator_depth; 1645 cm_rep_set_target_ack_delay(rep_msg, 1646 cm_id_priv->av.port->cm_dev->ack_delay); 1647 cm_rep_set_failover(rep_msg, param->failover_accepted); 1648 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1649 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1650 cm_rep_set_srq(rep_msg, param->srq); 1651 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1652 1653 if (param->private_data && param->private_data_len) 1654 memcpy(rep_msg->private_data, param->private_data, 1655 param->private_data_len); 1656} 1657 1658int ib_send_cm_rep(struct ib_cm_id *cm_id, 1659 struct ib_cm_rep_param *param) 1660{ 1661 struct cm_id_private *cm_id_priv; 1662 struct ib_mad_send_buf *msg; 1663 struct cm_rep_msg *rep_msg; 1664 unsigned long flags; 1665 int ret; 1666 1667 if (param->private_data && 1668 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1669 return -EINVAL; 1670 1671 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1672 spin_lock_irqsave(&cm_id_priv->lock, flags); 1673 if (cm_id->state != IB_CM_REQ_RCVD && 1674 cm_id->state != IB_CM_MRA_REQ_SENT) { 1675 ret = -EINVAL; 1676 goto out; 1677 } 1678 1679 ret = cm_alloc_msg(cm_id_priv, &msg); 1680 if (ret) 1681 goto out; 1682 1683 rep_msg = (struct cm_rep_msg *) msg->mad; 1684 cm_format_rep(rep_msg, cm_id_priv, param); 1685 msg->timeout_ms = cm_id_priv->timeout_ms; 1686 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1687 1688 ret = ib_post_send_mad(msg, NULL); 1689 if (ret) { 1690 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1691 cm_free_msg(msg); 1692 return ret; 1693 } 1694 1695 cm_id->state = IB_CM_REP_SENT; 1696 cm_id_priv->msg = msg; 1697 cm_id_priv->initiator_depth = param->initiator_depth; 1698 cm_id_priv->responder_resources = param->responder_resources; 1699 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1700 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1701 1702out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1703 return ret; 1704} 1705EXPORT_SYMBOL(ib_send_cm_rep); 1706 1707static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1708 struct cm_id_private *cm_id_priv, 1709 const void *private_data, 1710 u8 private_data_len) 1711{ 1712 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1713 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1714 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1715 1716 if (private_data && private_data_len) 1717 memcpy(rtu_msg->private_data, private_data, private_data_len); 1718} 1719 1720int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1721 const void *private_data, 1722 u8 private_data_len) 1723{ 1724 struct cm_id_private *cm_id_priv; 1725 struct ib_mad_send_buf *msg; 1726 unsigned long flags; 1727 void *data; 1728 int ret; 1729 1730 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1731 return -EINVAL; 1732 1733 data = cm_copy_private_data(private_data, private_data_len); 1734 if (IS_ERR(data)) 1735 return PTR_ERR(data); 1736 1737 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1738 spin_lock_irqsave(&cm_id_priv->lock, flags); 1739 if (cm_id->state != IB_CM_REP_RCVD && 1740 cm_id->state != IB_CM_MRA_REP_SENT) { 1741 ret = -EINVAL; 1742 goto error; 1743 } 1744 1745 ret = cm_alloc_msg(cm_id_priv, &msg); 1746 if (ret) 1747 goto error; 1748 1749 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1750 private_data, private_data_len); 1751 1752 ret = ib_post_send_mad(msg, NULL); 1753 if (ret) { 1754 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1755 cm_free_msg(msg); 1756 kfree(data); 1757 return ret; 1758 } 1759 1760 cm_id->state = IB_CM_ESTABLISHED; 1761 cm_set_private_data(cm_id_priv, data, private_data_len); 1762 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1763 return 0; 1764 1765error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1766 kfree(data); 1767 return ret; 1768} 1769EXPORT_SYMBOL(ib_send_cm_rtu); 1770 1771static void cm_format_rep_event(struct cm_work *work) 1772{ 1773 struct cm_rep_msg *rep_msg; 1774 struct ib_cm_rep_event_param *param; 1775 1776 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1777 param = &work->cm_event.param.rep_rcvd; 1778 param->remote_ca_guid = rep_msg->local_ca_guid; 1779 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1780 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1781 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1782 param->responder_resources = rep_msg->initiator_depth; 1783 param->initiator_depth = rep_msg->resp_resources; 1784 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1785 param->failover_accepted = cm_rep_get_failover(rep_msg); 1786 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1787 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1788 param->srq = cm_rep_get_srq(rep_msg); 1789 work->cm_event.private_data = &rep_msg->private_data; 1790} 1791 1792static void cm_dup_rep_handler(struct cm_work *work) 1793{ 1794 struct cm_id_private *cm_id_priv; 1795 struct cm_rep_msg *rep_msg; 1796 struct ib_mad_send_buf *msg = NULL; 1797 int ret; 1798 1799 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1800 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1801 rep_msg->local_comm_id); 1802 if (!cm_id_priv) 1803 return; 1804 1805 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1806 counter[CM_REP_COUNTER]); 1807 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1808 if (ret) 1809 goto deref; 1810 1811 spin_lock_irq(&cm_id_priv->lock); 1812 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1813 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1814 cm_id_priv->private_data, 1815 cm_id_priv->private_data_len); 1816 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1817 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1818 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1819 cm_id_priv->private_data, 1820 cm_id_priv->private_data_len); 1821 else 1822 goto unlock; 1823 spin_unlock_irq(&cm_id_priv->lock); 1824 1825 ret = ib_post_send_mad(msg, NULL); 1826 if (ret) 1827 goto free; 1828 goto deref; 1829 1830unlock: spin_unlock_irq(&cm_id_priv->lock); 1831free: cm_free_msg(msg); 1832deref: cm_deref_id(cm_id_priv); 1833} 1834 1835static int cm_rep_handler(struct cm_work *work) 1836{ 1837 struct cm_id_private *cm_id_priv; 1838 struct cm_rep_msg *rep_msg; 1839 int ret; 1840 1841 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1842 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1843 if (!cm_id_priv) { 1844 cm_dup_rep_handler(work); 1845 return -EINVAL; 1846 } 1847 1848 cm_format_rep_event(work); 1849 1850 spin_lock_irq(&cm_id_priv->lock); 1851 switch (cm_id_priv->id.state) { 1852 case IB_CM_REQ_SENT: 1853 case IB_CM_MRA_REQ_RCVD: 1854 break; 1855 default: 1856 spin_unlock_irq(&cm_id_priv->lock); 1857 ret = -EINVAL; 1858 goto error; 1859 } 1860 1861 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1862 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1863 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1864 1865 spin_lock(&cm.lock); 1866 /* Check for duplicate REP. */ 1867 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1868 spin_unlock(&cm.lock); 1869 spin_unlock_irq(&cm_id_priv->lock); 1870 ret = -EINVAL; 1871 goto error; 1872 } 1873 /* Check for a stale connection. */ 1874 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1875 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1876 &cm.remote_id_table); 1877 cm_id_priv->timewait_info->inserted_remote_id = 0; 1878 spin_unlock(&cm.lock); 1879 spin_unlock_irq(&cm_id_priv->lock); 1880 cm_issue_rej(work->port, work->mad_recv_wc, 1881 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1882 NULL, 0); 1883 ret = -EINVAL; 1884 goto error; 1885 } 1886 spin_unlock(&cm.lock); 1887 1888 cm_id_priv->id.state = IB_CM_REP_RCVD; 1889 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1890 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1891 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1892 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1893 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1894 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1895 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1896 cm_id_priv->av.timeout = 1897 cm_ack_timeout(cm_id_priv->target_ack_delay, 1898 cm_id_priv->av.timeout - 1); 1899 cm_id_priv->alt_av.timeout = 1900 cm_ack_timeout(cm_id_priv->target_ack_delay, 1901 cm_id_priv->alt_av.timeout - 1); 1902 1903 /* todo: handle peer_to_peer */ 1904 1905 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1906 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1907 if (!ret) 1908 list_add_tail(&work->list, &cm_id_priv->work_list); 1909 spin_unlock_irq(&cm_id_priv->lock); 1910 1911 if (ret) 1912 cm_process_work(cm_id_priv, work); 1913 else 1914 cm_deref_id(cm_id_priv); 1915 return 0; 1916 1917error: 1918 cm_deref_id(cm_id_priv); 1919 return ret; 1920} 1921 1922static int cm_establish_handler(struct cm_work *work) 1923{ 1924 struct cm_id_private *cm_id_priv; 1925 int ret; 1926 1927 /* See comment in cm_establish about lookup. */ 1928 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1929 if (!cm_id_priv) 1930 return -EINVAL; 1931 1932 spin_lock_irq(&cm_id_priv->lock); 1933 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1934 spin_unlock_irq(&cm_id_priv->lock); 1935 goto out; 1936 } 1937 1938 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1939 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1940 if (!ret) 1941 list_add_tail(&work->list, &cm_id_priv->work_list); 1942 spin_unlock_irq(&cm_id_priv->lock); 1943 1944 if (ret) 1945 cm_process_work(cm_id_priv, work); 1946 else 1947 cm_deref_id(cm_id_priv); 1948 return 0; 1949out: 1950 cm_deref_id(cm_id_priv); 1951 return -EINVAL; 1952} 1953 1954static int cm_rtu_handler(struct cm_work *work) 1955{ 1956 struct cm_id_private *cm_id_priv; 1957 struct cm_rtu_msg *rtu_msg; 1958 int ret; 1959 1960 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1961 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1962 rtu_msg->local_comm_id); 1963 if (!cm_id_priv) 1964 return -EINVAL; 1965 1966 work->cm_event.private_data = &rtu_msg->private_data; 1967 1968 spin_lock_irq(&cm_id_priv->lock); 1969 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1970 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1971 spin_unlock_irq(&cm_id_priv->lock); 1972 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1973 counter[CM_RTU_COUNTER]); 1974 goto out; 1975 } 1976 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1977 1978 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1979 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1980 if (!ret) 1981 list_add_tail(&work->list, &cm_id_priv->work_list); 1982 spin_unlock_irq(&cm_id_priv->lock); 1983 1984 if (ret) 1985 cm_process_work(cm_id_priv, work); 1986 else 1987 cm_deref_id(cm_id_priv); 1988 return 0; 1989out: 1990 cm_deref_id(cm_id_priv); 1991 return -EINVAL; 1992} 1993 1994static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1995 struct cm_id_private *cm_id_priv, 1996 const void *private_data, 1997 u8 private_data_len) 1998{ 1999 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 2000 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 2001 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 2002 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2003 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2004 2005 if (private_data && private_data_len) 2006 memcpy(dreq_msg->private_data, private_data, private_data_len); 2007} 2008 2009int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2010 const void *private_data, 2011 u8 private_data_len) 2012{ 2013 struct cm_id_private *cm_id_priv; 2014 struct ib_mad_send_buf *msg; 2015 unsigned long flags; 2016 int ret; 2017 2018 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2019 return -EINVAL; 2020 2021 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2022 spin_lock_irqsave(&cm_id_priv->lock, flags); 2023 if (cm_id->state != IB_CM_ESTABLISHED) { 2024 ret = -EINVAL; 2025 goto out; 2026 } 2027 2028 ret = cm_alloc_msg(cm_id_priv, &msg); 2029 if (ret) { 2030 cm_enter_timewait(cm_id_priv); 2031 goto out; 2032 } 2033 2034 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2035 private_data, private_data_len); 2036 msg->timeout_ms = cm_id_priv->timeout_ms; 2037 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2038 2039 ret = ib_post_send_mad(msg, NULL); 2040 if (ret) { 2041 cm_enter_timewait(cm_id_priv); 2042 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2043 cm_free_msg(msg); 2044 return ret; 2045 } 2046 2047 cm_id->state = IB_CM_DREQ_SENT; 2048 cm_id_priv->msg = msg; 2049out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2050 return ret; 2051} 2052EXPORT_SYMBOL(ib_send_cm_dreq); 2053 2054static void cm_format_drep(struct cm_drep_msg *drep_msg, 2055 struct cm_id_private *cm_id_priv, 2056 const void *private_data, 2057 u8 private_data_len) 2058{ 2059 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2060 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2061 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2062 2063 if (private_data && private_data_len) 2064 memcpy(drep_msg->private_data, private_data, private_data_len); 2065} 2066 2067int ib_send_cm_drep(struct ib_cm_id *cm_id, 2068 const void *private_data, 2069 u8 private_data_len) 2070{ 2071 struct cm_id_private *cm_id_priv; 2072 struct ib_mad_send_buf *msg; 2073 unsigned long flags; 2074 void *data; 2075 int ret; 2076 2077 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2078 return -EINVAL; 2079 2080 data = cm_copy_private_data(private_data, private_data_len); 2081 if (IS_ERR(data)) 2082 return PTR_ERR(data); 2083 2084 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2085 spin_lock_irqsave(&cm_id_priv->lock, flags); 2086 if (cm_id->state != IB_CM_DREQ_RCVD) { 2087 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2088 kfree(data); 2089 return -EINVAL; 2090 } 2091 2092 cm_set_private_data(cm_id_priv, data, private_data_len); 2093 cm_enter_timewait(cm_id_priv); 2094 2095 ret = cm_alloc_msg(cm_id_priv, &msg); 2096 if (ret) 2097 goto out; 2098 2099 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2100 private_data, private_data_len); 2101 2102 ret = ib_post_send_mad(msg, NULL); 2103 if (ret) { 2104 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2105 cm_free_msg(msg); 2106 return ret; 2107 } 2108 2109out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2110 return ret; 2111} 2112EXPORT_SYMBOL(ib_send_cm_drep); 2113 2114static int cm_issue_drep(struct cm_port *port, 2115 struct ib_mad_recv_wc *mad_recv_wc) 2116{ 2117 struct ib_mad_send_buf *msg = NULL; 2118 struct cm_dreq_msg *dreq_msg; 2119 struct cm_drep_msg *drep_msg; 2120 int ret; 2121 2122 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2123 if (ret) 2124 return ret; 2125 2126 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2127 drep_msg = (struct cm_drep_msg *) msg->mad; 2128 2129 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2130 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2131 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2132 2133 ret = ib_post_send_mad(msg, NULL); 2134 if (ret) 2135 cm_free_msg(msg); 2136 2137 return ret; 2138} 2139 2140static int cm_dreq_handler(struct cm_work *work) 2141{ 2142 struct cm_id_private *cm_id_priv; 2143 struct cm_dreq_msg *dreq_msg; 2144 struct ib_mad_send_buf *msg = NULL; 2145 int ret; 2146 2147 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2148 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2149 dreq_msg->local_comm_id); 2150 if (!cm_id_priv) { 2151 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2152 counter[CM_DREQ_COUNTER]); 2153 cm_issue_drep(work->port, work->mad_recv_wc); 2154 return -EINVAL; 2155 } 2156 2157 work->cm_event.private_data = &dreq_msg->private_data; 2158 2159 spin_lock_irq(&cm_id_priv->lock); 2160 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2161 goto unlock; 2162 2163 switch (cm_id_priv->id.state) { 2164 case IB_CM_REP_SENT: 2165 case IB_CM_DREQ_SENT: 2166 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2167 break; 2168 case IB_CM_ESTABLISHED: 2169 case IB_CM_MRA_REP_RCVD: 2170 break; 2171 case IB_CM_TIMEWAIT: 2172 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2173 counter[CM_DREQ_COUNTER]); 2174 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2175 goto unlock; 2176 2177 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2178 cm_id_priv->private_data, 2179 cm_id_priv->private_data_len); 2180 spin_unlock_irq(&cm_id_priv->lock); 2181 2182 if (ib_post_send_mad(msg, NULL)) 2183 cm_free_msg(msg); 2184 goto deref; 2185 case IB_CM_DREQ_RCVD: 2186 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2187 counter[CM_DREQ_COUNTER]); 2188 goto unlock; 2189 default: 2190 goto unlock; 2191 } 2192 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2193 cm_id_priv->tid = dreq_msg->hdr.tid; 2194 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2195 if (!ret) 2196 list_add_tail(&work->list, &cm_id_priv->work_list); 2197 spin_unlock_irq(&cm_id_priv->lock); 2198 2199 if (ret) 2200 cm_process_work(cm_id_priv, work); 2201 else 2202 cm_deref_id(cm_id_priv); 2203 return 0; 2204 2205unlock: spin_unlock_irq(&cm_id_priv->lock); 2206deref: cm_deref_id(cm_id_priv); 2207 return -EINVAL; 2208} 2209 2210static int cm_drep_handler(struct cm_work *work) 2211{ 2212 struct cm_id_private *cm_id_priv; 2213 struct cm_drep_msg *drep_msg; 2214 int ret; 2215 2216 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2217 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2218 drep_msg->local_comm_id); 2219 if (!cm_id_priv) 2220 return -EINVAL; 2221 2222 work->cm_event.private_data = &drep_msg->private_data; 2223 2224 spin_lock_irq(&cm_id_priv->lock); 2225 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2226 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2227 spin_unlock_irq(&cm_id_priv->lock); 2228 goto out; 2229 } 2230 cm_enter_timewait(cm_id_priv); 2231 2232 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2233 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2234 if (!ret) 2235 list_add_tail(&work->list, &cm_id_priv->work_list); 2236 spin_unlock_irq(&cm_id_priv->lock); 2237 2238 if (ret) 2239 cm_process_work(cm_id_priv, work); 2240 else 2241 cm_deref_id(cm_id_priv); 2242 return 0; 2243out: 2244 cm_deref_id(cm_id_priv); 2245 return -EINVAL; 2246} 2247 2248int ib_send_cm_rej(struct ib_cm_id *cm_id, 2249 enum ib_cm_rej_reason reason, 2250 void *ari, 2251 u8 ari_length, 2252 const void *private_data, 2253 u8 private_data_len) 2254{ 2255 struct cm_id_private *cm_id_priv; 2256 struct ib_mad_send_buf *msg; 2257 unsigned long flags; 2258 int ret; 2259 2260 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2261 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2262 return -EINVAL; 2263 2264 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2265 2266 spin_lock_irqsave(&cm_id_priv->lock, flags); 2267 switch (cm_id->state) { 2268 case IB_CM_REQ_SENT: 2269 case IB_CM_MRA_REQ_RCVD: 2270 case IB_CM_REQ_RCVD: 2271 case IB_CM_MRA_REQ_SENT: 2272 case IB_CM_REP_RCVD: 2273 case IB_CM_MRA_REP_SENT: 2274 ret = cm_alloc_msg(cm_id_priv, &msg); 2275 if (!ret) 2276 cm_format_rej((struct cm_rej_msg *) msg->mad, 2277 cm_id_priv, reason, ari, ari_length, 2278 private_data, private_data_len); 2279 2280 cm_reset_to_idle(cm_id_priv); 2281 break; 2282 case IB_CM_REP_SENT: 2283 case IB_CM_MRA_REP_RCVD: 2284 ret = cm_alloc_msg(cm_id_priv, &msg); 2285 if (!ret) 2286 cm_format_rej((struct cm_rej_msg *) msg->mad, 2287 cm_id_priv, reason, ari, ari_length, 2288 private_data, private_data_len); 2289 2290 cm_enter_timewait(cm_id_priv); 2291 break; 2292 default: 2293 ret = -EINVAL; 2294 goto out; 2295 } 2296 2297 if (ret) 2298 goto out; 2299 2300 ret = ib_post_send_mad(msg, NULL); 2301 if (ret) 2302 cm_free_msg(msg); 2303 2304out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2305 return ret; 2306} 2307EXPORT_SYMBOL(ib_send_cm_rej); 2308 2309static void cm_format_rej_event(struct cm_work *work) 2310{ 2311 struct cm_rej_msg *rej_msg; 2312 struct ib_cm_rej_event_param *param; 2313 2314 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2315 param = &work->cm_event.param.rej_rcvd; 2316 param->ari = rej_msg->ari; 2317 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2318 param->reason = __be16_to_cpu(rej_msg->reason); 2319 work->cm_event.private_data = &rej_msg->private_data; 2320} 2321 2322static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2323{ 2324 struct cm_timewait_info *timewait_info; 2325 struct cm_id_private *cm_id_priv; 2326 __be32 remote_id; 2327 2328 remote_id = rej_msg->local_comm_id; 2329 2330 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2331 spin_lock_irq(&cm.lock); 2332 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2333 remote_id); 2334 if (!timewait_info) { 2335 spin_unlock_irq(&cm.lock); 2336 return NULL; 2337 } 2338 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2339 (timewait_info->work.local_id ^ 2340 cm.random_id_operand)); 2341 if (cm_id_priv) { 2342 if (cm_id_priv->id.remote_id == remote_id) 2343 atomic_inc(&cm_id_priv->refcount); 2344 else 2345 cm_id_priv = NULL; 2346 } 2347 spin_unlock_irq(&cm.lock); 2348 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2349 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2350 else 2351 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2352 2353 return cm_id_priv; 2354} 2355 2356static int cm_rej_handler(struct cm_work *work) 2357{ 2358 struct cm_id_private *cm_id_priv; 2359 struct cm_rej_msg *rej_msg; 2360 int ret; 2361 2362 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2363 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2364 if (!cm_id_priv) 2365 return -EINVAL; 2366 2367 cm_format_rej_event(work); 2368 2369 spin_lock_irq(&cm_id_priv->lock); 2370 switch (cm_id_priv->id.state) { 2371 case IB_CM_REQ_SENT: 2372 case IB_CM_MRA_REQ_RCVD: 2373 case IB_CM_REP_SENT: 2374 case IB_CM_MRA_REP_RCVD: 2375 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2376 /* fall through */ 2377 case IB_CM_REQ_RCVD: 2378 case IB_CM_MRA_REQ_SENT: 2379 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2380 cm_enter_timewait(cm_id_priv); 2381 else 2382 cm_reset_to_idle(cm_id_priv); 2383 break; 2384 case IB_CM_DREQ_SENT: 2385 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2386 /* fall through */ 2387 case IB_CM_REP_RCVD: 2388 case IB_CM_MRA_REP_SENT: 2389 case IB_CM_ESTABLISHED: 2390 cm_enter_timewait(cm_id_priv); 2391 break; 2392 default: 2393 spin_unlock_irq(&cm_id_priv->lock); 2394 ret = -EINVAL; 2395 goto out; 2396 } 2397 2398 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2399 if (!ret) 2400 list_add_tail(&work->list, &cm_id_priv->work_list); 2401 spin_unlock_irq(&cm_id_priv->lock); 2402 2403 if (ret) 2404 cm_process_work(cm_id_priv, work); 2405 else 2406 cm_deref_id(cm_id_priv); 2407 return 0; 2408out: 2409 cm_deref_id(cm_id_priv); 2410 return -EINVAL; 2411} 2412 2413int ib_send_cm_mra(struct ib_cm_id *cm_id, 2414 u8 service_timeout, 2415 const void *private_data, 2416 u8 private_data_len) 2417{ 2418 struct cm_id_private *cm_id_priv; 2419 struct ib_mad_send_buf *msg; 2420 enum ib_cm_state cm_state; 2421 enum ib_cm_lap_state lap_state; 2422 enum cm_msg_response msg_response; 2423 void *data; 2424 unsigned long flags; 2425 int ret; 2426 2427 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2428 return -EINVAL; 2429 2430 data = cm_copy_private_data(private_data, private_data_len); 2431 if (IS_ERR(data)) 2432 return PTR_ERR(data); 2433 2434 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2435 2436 spin_lock_irqsave(&cm_id_priv->lock, flags); 2437 switch(cm_id_priv->id.state) { 2438 case IB_CM_REQ_RCVD: 2439 cm_state = IB_CM_MRA_REQ_SENT; 2440 lap_state = cm_id->lap_state; 2441 msg_response = CM_MSG_RESPONSE_REQ; 2442 break; 2443 case IB_CM_REP_RCVD: 2444 cm_state = IB_CM_MRA_REP_SENT; 2445 lap_state = cm_id->lap_state; 2446 msg_response = CM_MSG_RESPONSE_REP; 2447 break; 2448 case IB_CM_ESTABLISHED: 2449 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2450 cm_state = cm_id->state; 2451 lap_state = IB_CM_MRA_LAP_SENT; 2452 msg_response = CM_MSG_RESPONSE_OTHER; 2453 break; 2454 } 2455 default: 2456 ret = -EINVAL; 2457 goto error1; 2458 } 2459 2460 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2461 ret = cm_alloc_msg(cm_id_priv, &msg); 2462 if (ret) 2463 goto error1; 2464 2465 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2466 msg_response, service_timeout, 2467 private_data, private_data_len); 2468 ret = ib_post_send_mad(msg, NULL); 2469 if (ret) 2470 goto error2; 2471 } 2472 2473 cm_id->state = cm_state; 2474 cm_id->lap_state = lap_state; 2475 cm_id_priv->service_timeout = service_timeout; 2476 cm_set_private_data(cm_id_priv, data, private_data_len); 2477 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2478 return 0; 2479 2480error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2481 kfree(data); 2482 return ret; 2483 2484error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2485 kfree(data); 2486 cm_free_msg(msg); 2487 return ret; 2488} 2489EXPORT_SYMBOL(ib_send_cm_mra); 2490 2491static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2492{ 2493 switch (cm_mra_get_msg_mraed(mra_msg)) { 2494 case CM_MSG_RESPONSE_REQ: 2495 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2496 case CM_MSG_RESPONSE_REP: 2497 case CM_MSG_RESPONSE_OTHER: 2498 return cm_acquire_id(mra_msg->remote_comm_id, 2499 mra_msg->local_comm_id); 2500 default: 2501 return NULL; 2502 } 2503} 2504 2505static int cm_mra_handler(struct cm_work *work) 2506{ 2507 struct cm_id_private *cm_id_priv; 2508 struct cm_mra_msg *mra_msg; 2509 int timeout, ret; 2510 2511 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2512 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2513 if (!cm_id_priv) 2514 return -EINVAL; 2515 2516 work->cm_event.private_data = &mra_msg->private_data; 2517 work->cm_event.param.mra_rcvd.service_timeout = 2518 cm_mra_get_service_timeout(mra_msg); 2519 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2520 cm_convert_to_ms(cm_id_priv->av.timeout); 2521 if (timeout > cm_convert_to_ms(max_timeout)) { 2522 printk(KERN_WARNING PFX "calculated mra timeout %d > %d, " 2523 "decreasing used timeout_ms\n", timeout, 2524 cm_convert_to_ms(max_timeout)); 2525 timeout = cm_convert_to_ms(max_timeout); 2526 } 2527 2528 spin_lock_irq(&cm_id_priv->lock); 2529 switch (cm_id_priv->id.state) { 2530 case IB_CM_REQ_SENT: 2531 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2532 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2533 cm_id_priv->msg, timeout)) 2534 goto out; 2535 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2536 break; 2537 case IB_CM_REP_SENT: 2538 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2539 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2540 cm_id_priv->msg, timeout)) 2541 goto out; 2542 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2543 break; 2544 case IB_CM_ESTABLISHED: 2545 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2546 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2547 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2548 cm_id_priv->msg, timeout)) { 2549 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2550 atomic_long_inc(&work->port-> 2551 counter_group[CM_RECV_DUPLICATES]. 2552 counter[CM_MRA_COUNTER]); 2553 goto out; 2554 } 2555 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2556 break; 2557 case IB_CM_MRA_REQ_RCVD: 2558 case IB_CM_MRA_REP_RCVD: 2559 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2560 counter[CM_MRA_COUNTER]); 2561 /* fall through */ 2562 default: 2563 goto out; 2564 } 2565 2566 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2567 cm_id_priv->id.state; 2568 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2569 if (!ret) 2570 list_add_tail(&work->list, &cm_id_priv->work_list); 2571 spin_unlock_irq(&cm_id_priv->lock); 2572 2573 if (ret) 2574 cm_process_work(cm_id_priv, work); 2575 else 2576 cm_deref_id(cm_id_priv); 2577 return 0; 2578out: 2579 spin_unlock_irq(&cm_id_priv->lock); 2580 cm_deref_id(cm_id_priv); 2581 return -EINVAL; 2582} 2583 2584static void cm_format_lap(struct cm_lap_msg *lap_msg, 2585 struct cm_id_private *cm_id_priv, 2586 struct ib_sa_path_rec *alternate_path, 2587 const void *private_data, 2588 u8 private_data_len) 2589{ 2590 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2591 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2592 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2593 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2594 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2595 /* todo: need remote CM response timeout */ 2596 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2597 lap_msg->alt_local_lid = alternate_path->slid; 2598 lap_msg->alt_remote_lid = alternate_path->dlid; 2599 lap_msg->alt_local_gid = alternate_path->sgid; 2600 lap_msg->alt_remote_gid = alternate_path->dgid; 2601 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2602 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2603 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2604 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2605 cm_lap_set_sl(lap_msg, alternate_path->sl); 2606 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2607 cm_lap_set_local_ack_timeout(lap_msg, 2608 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2609 alternate_path->packet_life_time)); 2610 2611 if (private_data && private_data_len) 2612 memcpy(lap_msg->private_data, private_data, private_data_len); 2613} 2614 2615int ib_send_cm_lap(struct ib_cm_id *cm_id, 2616 struct ib_sa_path_rec *alternate_path, 2617 const void *private_data, 2618 u8 private_data_len) 2619{ 2620 struct cm_id_private *cm_id_priv; 2621 struct ib_mad_send_buf *msg; 2622 unsigned long flags; 2623 int ret; 2624 2625 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2626 return -EINVAL; 2627 2628 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2629 spin_lock_irqsave(&cm_id_priv->lock, flags); 2630 if (cm_id->state != IB_CM_ESTABLISHED || 2631 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2632 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2633 ret = -EINVAL; 2634 goto out; 2635 } 2636 2637 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2638 if (ret) 2639 goto out; 2640 cm_id_priv->alt_av.timeout = 2641 cm_ack_timeout(cm_id_priv->target_ack_delay, 2642 cm_id_priv->alt_av.timeout - 1); 2643 2644 ret = cm_alloc_msg(cm_id_priv, &msg); 2645 if (ret) 2646 goto out; 2647 2648 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2649 alternate_path, private_data, private_data_len); 2650 msg->timeout_ms = cm_id_priv->timeout_ms; 2651 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2652 2653 ret = ib_post_send_mad(msg, NULL); 2654 if (ret) { 2655 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2656 cm_free_msg(msg); 2657 return ret; 2658 } 2659 2660 cm_id->lap_state = IB_CM_LAP_SENT; 2661 cm_id_priv->msg = msg; 2662 2663out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2664 return ret; 2665} 2666EXPORT_SYMBOL(ib_send_cm_lap); 2667 2668static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2669 struct ib_sa_path_rec *path, 2670 struct cm_lap_msg *lap_msg) 2671{ 2672 memset(path, 0, sizeof *path); 2673 path->dgid = lap_msg->alt_local_gid; 2674 path->sgid = lap_msg->alt_remote_gid; 2675 path->dlid = lap_msg->alt_local_lid; 2676 path->slid = lap_msg->alt_remote_lid; 2677 path->flow_label = cm_lap_get_flow_label(lap_msg); 2678 path->hop_limit = lap_msg->alt_hop_limit; 2679 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2680 path->reversible = 1; 2681 path->pkey = cm_id_priv->pkey; 2682 path->sl = cm_lap_get_sl(lap_msg); 2683 path->mtu_selector = IB_SA_EQ; 2684 path->mtu = cm_id_priv->path_mtu; 2685 path->rate_selector = IB_SA_EQ; 2686 path->rate = cm_lap_get_packet_rate(lap_msg); 2687 path->packet_life_time_selector = IB_SA_EQ; 2688 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2689 path->packet_life_time -= (path->packet_life_time > 0); 2690} 2691 2692static int cm_lap_handler(struct cm_work *work) 2693{ 2694 struct cm_id_private *cm_id_priv; 2695 struct cm_lap_msg *lap_msg; 2696 struct ib_cm_lap_event_param *param; 2697 struct ib_mad_send_buf *msg = NULL; 2698 int ret; 2699 2700 /* todo: verify LAP request and send reject APR if invalid. */ 2701 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2702 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2703 lap_msg->local_comm_id); 2704 if (!cm_id_priv) 2705 return -EINVAL; 2706 2707 param = &work->cm_event.param.lap_rcvd; 2708 param->alternate_path = &work->path[0]; 2709 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2710 work->cm_event.private_data = &lap_msg->private_data; 2711 2712 spin_lock_irq(&cm_id_priv->lock); 2713 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2714 goto unlock; 2715 2716 switch (cm_id_priv->id.lap_state) { 2717 case IB_CM_LAP_UNINIT: 2718 case IB_CM_LAP_IDLE: 2719 break; 2720 case IB_CM_MRA_LAP_SENT: 2721 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2722 counter[CM_LAP_COUNTER]); 2723 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2724 goto unlock; 2725 2726 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2727 CM_MSG_RESPONSE_OTHER, 2728 cm_id_priv->service_timeout, 2729 cm_id_priv->private_data, 2730 cm_id_priv->private_data_len); 2731 spin_unlock_irq(&cm_id_priv->lock); 2732 2733 if (ib_post_send_mad(msg, NULL)) 2734 cm_free_msg(msg); 2735 goto deref; 2736 case IB_CM_LAP_RCVD: 2737 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2738 counter[CM_LAP_COUNTER]); 2739 goto unlock; 2740 default: 2741 goto unlock; 2742 } 2743 2744 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2745 cm_id_priv->tid = lap_msg->hdr.tid; 2746 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2747 work->mad_recv_wc->recv_buf.grh, 2748 &cm_id_priv->av); 2749 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2750 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2751 if (!ret) 2752 list_add_tail(&work->list, &cm_id_priv->work_list); 2753 spin_unlock_irq(&cm_id_priv->lock); 2754 2755 if (ret) 2756 cm_process_work(cm_id_priv, work); 2757 else 2758 cm_deref_id(cm_id_priv); 2759 return 0; 2760 2761unlock: spin_unlock_irq(&cm_id_priv->lock); 2762deref: cm_deref_id(cm_id_priv); 2763 return -EINVAL; 2764} 2765 2766static void cm_format_apr(struct cm_apr_msg *apr_msg, 2767 struct cm_id_private *cm_id_priv, 2768 enum ib_cm_apr_status status, 2769 void *info, 2770 u8 info_length, 2771 const void *private_data, 2772 u8 private_data_len) 2773{ 2774 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2775 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2776 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2777 apr_msg->ap_status = (u8) status; 2778 2779 if (info && info_length) { 2780 apr_msg->info_length = info_length; 2781 memcpy(apr_msg->info, info, info_length); 2782 } 2783 2784 if (private_data && private_data_len) 2785 memcpy(apr_msg->private_data, private_data, private_data_len); 2786} 2787 2788int ib_send_cm_apr(struct ib_cm_id *cm_id, 2789 enum ib_cm_apr_status status, 2790 void *info, 2791 u8 info_length, 2792 const void *private_data, 2793 u8 private_data_len) 2794{ 2795 struct cm_id_private *cm_id_priv; 2796 struct ib_mad_send_buf *msg; 2797 unsigned long flags; 2798 int ret; 2799 2800 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2801 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2802 return -EINVAL; 2803 2804 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2805 spin_lock_irqsave(&cm_id_priv->lock, flags); 2806 if (cm_id->state != IB_CM_ESTABLISHED || 2807 (cm_id->lap_state != IB_CM_LAP_RCVD && 2808 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2809 ret = -EINVAL; 2810 goto out; 2811 } 2812 2813 ret = cm_alloc_msg(cm_id_priv, &msg); 2814 if (ret) 2815 goto out; 2816 2817 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2818 info, info_length, private_data, private_data_len); 2819 ret = ib_post_send_mad(msg, NULL); 2820 if (ret) { 2821 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2822 cm_free_msg(msg); 2823 return ret; 2824 } 2825 2826 cm_id->lap_state = IB_CM_LAP_IDLE; 2827out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2828 return ret; 2829} 2830EXPORT_SYMBOL(ib_send_cm_apr); 2831 2832static int cm_apr_handler(struct cm_work *work) 2833{ 2834 struct cm_id_private *cm_id_priv; 2835 struct cm_apr_msg *apr_msg; 2836 int ret; 2837 2838 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2839 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2840 apr_msg->local_comm_id); 2841 if (!cm_id_priv) 2842 return -EINVAL; /* Unmatched reply. */ 2843 2844 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2845 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2846 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2847 work->cm_event.private_data = &apr_msg->private_data; 2848 2849 spin_lock_irq(&cm_id_priv->lock); 2850 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2851 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2852 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2853 spin_unlock_irq(&cm_id_priv->lock); 2854 goto out; 2855 } 2856 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2857 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2858 cm_id_priv->msg = NULL; 2859 2860 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2861 if (!ret) 2862 list_add_tail(&work->list, &cm_id_priv->work_list); 2863 spin_unlock_irq(&cm_id_priv->lock); 2864 2865 if (ret) 2866 cm_process_work(cm_id_priv, work); 2867 else 2868 cm_deref_id(cm_id_priv); 2869 return 0; 2870out: 2871 cm_deref_id(cm_id_priv); 2872 return -EINVAL; 2873} 2874 2875static int cm_timewait_handler(struct cm_work *work) 2876{ 2877 struct cm_timewait_info *timewait_info; 2878 struct cm_id_private *cm_id_priv; 2879 int ret; 2880 2881 timewait_info = (struct cm_timewait_info *)work; 2882 spin_lock_irq(&cm.lock); 2883 list_del(&timewait_info->list); 2884 spin_unlock_irq(&cm.lock); 2885 2886 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2887 timewait_info->work.remote_id); 2888 if (!cm_id_priv) 2889 return -EINVAL; 2890 2891 spin_lock_irq(&cm_id_priv->lock); 2892 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2893 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2894 spin_unlock_irq(&cm_id_priv->lock); 2895 goto out; 2896 } 2897 cm_id_priv->id.state = IB_CM_IDLE; 2898 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2899 if (!ret) 2900 list_add_tail(&work->list, &cm_id_priv->work_list); 2901 spin_unlock_irq(&cm_id_priv->lock); 2902 2903 if (ret) 2904 cm_process_work(cm_id_priv, work); 2905 else 2906 cm_deref_id(cm_id_priv); 2907 return 0; 2908out: 2909 cm_deref_id(cm_id_priv); 2910 return -EINVAL; 2911} 2912 2913static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2914 struct cm_id_private *cm_id_priv, 2915 struct ib_cm_sidr_req_param *param) 2916{ 2917 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2918 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2919 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2920 sidr_req_msg->pkey = param->path->pkey; 2921 sidr_req_msg->service_id = param->service_id; 2922 2923 if (param->private_data && param->private_data_len) 2924 memcpy(sidr_req_msg->private_data, param->private_data, 2925 param->private_data_len); 2926} 2927 2928int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2929 struct ib_cm_sidr_req_param *param) 2930{ 2931 struct cm_id_private *cm_id_priv; 2932 struct ib_mad_send_buf *msg; 2933 unsigned long flags; 2934 int ret; 2935 2936 if (!param->path || (param->private_data && 2937 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2938 return -EINVAL; 2939 2940 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2941 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2942 if (ret) 2943 goto out; 2944 2945 cm_id->service_id = param->service_id; 2946 cm_id->service_mask = ~cpu_to_be64(0); 2947 cm_id_priv->timeout_ms = param->timeout_ms; 2948 if (cm_id_priv->timeout_ms > cm_convert_to_ms(max_timeout)) { 2949 printk(KERN_WARNING PFX "sidr req timeout_ms %d > %d, " 2950 "decreasing used timeout_ms\n", param->timeout_ms, 2951 cm_convert_to_ms(max_timeout)); 2952 cm_id_priv->timeout_ms = cm_convert_to_ms(max_timeout); 2953 } 2954 cm_id_priv->max_cm_retries = param->max_cm_retries; 2955 ret = cm_alloc_msg(cm_id_priv, &msg); 2956 if (ret) 2957 goto out; 2958 2959 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2960 param); 2961 msg->timeout_ms = cm_id_priv->timeout_ms; 2962 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2963 2964 spin_lock_irqsave(&cm_id_priv->lock, flags); 2965 if (cm_id->state == IB_CM_IDLE) 2966 ret = ib_post_send_mad(msg, NULL); 2967 else 2968 ret = -EINVAL; 2969 2970 if (ret) { 2971 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2972 cm_free_msg(msg); 2973 goto out; 2974 } 2975 cm_id->state = IB_CM_SIDR_REQ_SENT; 2976 cm_id_priv->msg = msg; 2977 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2978out: 2979 return ret; 2980} 2981EXPORT_SYMBOL(ib_send_cm_sidr_req); 2982 2983static void cm_format_sidr_req_event(struct cm_work *work, 2984 struct ib_cm_id *listen_id) 2985{ 2986 struct cm_sidr_req_msg *sidr_req_msg; 2987 struct ib_cm_sidr_req_event_param *param; 2988 2989 sidr_req_msg = (struct cm_sidr_req_msg *) 2990 work->mad_recv_wc->recv_buf.mad; 2991 param = &work->cm_event.param.sidr_req_rcvd; 2992 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2993 param->listen_id = listen_id; 2994 param->port = work->port->port_num; 2995 work->cm_event.private_data = &sidr_req_msg->private_data; 2996} 2997 2998static int cm_sidr_req_handler(struct cm_work *work) 2999{ 3000 struct ib_cm_id *cm_id; 3001 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 3002 struct cm_sidr_req_msg *sidr_req_msg; 3003 struct ib_wc *wc; 3004 3005 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3006 if (IS_ERR(cm_id)) 3007 return PTR_ERR(cm_id); 3008 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3009 3010 /* Record SGID/SLID and request ID for lookup. */ 3011 sidr_req_msg = (struct cm_sidr_req_msg *) 3012 work->mad_recv_wc->recv_buf.mad; 3013 wc = work->mad_recv_wc->wc; 3014 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3015 cm_id_priv->av.dgid.global.interface_id = 0; 3016 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3017 work->mad_recv_wc->recv_buf.grh, 3018 &cm_id_priv->av); 3019 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3020 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3021 atomic_inc(&cm_id_priv->work_count); 3022 3023 spin_lock_irq(&cm.lock); 3024 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3025 if (cur_cm_id_priv) { 3026 spin_unlock_irq(&cm.lock); 3027 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3028 counter[CM_SIDR_REQ_COUNTER]); 3029 goto out; /* Duplicate message. */ 3030 } 3031 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3032 cur_cm_id_priv = cm_find_listen(cm_id->device, 3033 sidr_req_msg->service_id, 3034 sidr_req_msg->private_data); 3035 if (!cur_cm_id_priv) { 3036 spin_unlock_irq(&cm.lock); 3037 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3038 goto out; /* No match. */ 3039 } 3040 atomic_inc(&cur_cm_id_priv->refcount); 3041 spin_unlock_irq(&cm.lock); 3042 3043 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3044 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3045 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3046 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3047 3048 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3049 cm_process_work(cm_id_priv, work); 3050 cm_deref_id(cur_cm_id_priv); 3051 return 0; 3052out: 3053 ib_destroy_cm_id(&cm_id_priv->id); 3054 return -EINVAL; 3055} 3056 3057static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3058 struct cm_id_private *cm_id_priv, 3059 struct ib_cm_sidr_rep_param *param) 3060{ 3061 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3062 cm_id_priv->tid); 3063 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3064 sidr_rep_msg->status = param->status; 3065 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3066 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3067 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3068 3069 if (param->info && param->info_length) 3070 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3071 3072 if (param->private_data && param->private_data_len) 3073 memcpy(sidr_rep_msg->private_data, param->private_data, 3074 param->private_data_len); 3075} 3076 3077int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3078 struct ib_cm_sidr_rep_param *param) 3079{ 3080 struct cm_id_private *cm_id_priv; 3081 struct ib_mad_send_buf *msg; 3082 unsigned long flags; 3083 int ret; 3084 3085 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3086 (param->private_data && 3087 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3088 return -EINVAL; 3089 3090 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3091 spin_lock_irqsave(&cm_id_priv->lock, flags); 3092 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3093 ret = -EINVAL; 3094 goto error; 3095 } 3096 3097 ret = cm_alloc_msg(cm_id_priv, &msg); 3098 if (ret) 3099 goto error; 3100 3101 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3102 param); 3103 ret = ib_post_send_mad(msg, NULL); 3104 if (ret) { 3105 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3106 cm_free_msg(msg); 3107 return ret; 3108 } 3109 cm_id->state = IB_CM_IDLE; 3110 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3111 3112 spin_lock_irqsave(&cm.lock, flags); 3113 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3114 spin_unlock_irqrestore(&cm.lock, flags); 3115 return 0; 3116 3117error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3118 return ret; 3119} 3120EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3121 3122static void cm_format_sidr_rep_event(struct cm_work *work) 3123{ 3124 struct cm_sidr_rep_msg *sidr_rep_msg; 3125 struct ib_cm_sidr_rep_event_param *param; 3126 3127 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3128 work->mad_recv_wc->recv_buf.mad; 3129 param = &work->cm_event.param.sidr_rep_rcvd; 3130 param->status = sidr_rep_msg->status; 3131 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3132 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3133 param->info = &sidr_rep_msg->info; 3134 param->info_len = sidr_rep_msg->info_length; 3135 work->cm_event.private_data = &sidr_rep_msg->private_data; 3136} 3137 3138static int cm_sidr_rep_handler(struct cm_work *work) 3139{ 3140 struct cm_sidr_rep_msg *sidr_rep_msg; 3141 struct cm_id_private *cm_id_priv; 3142 3143 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3144 work->mad_recv_wc->recv_buf.mad; 3145 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3146 if (!cm_id_priv) 3147 return -EINVAL; /* Unmatched reply. */ 3148 3149 spin_lock_irq(&cm_id_priv->lock); 3150 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3151 spin_unlock_irq(&cm_id_priv->lock); 3152 goto out; 3153 } 3154 cm_id_priv->id.state = IB_CM_IDLE; 3155 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3156 spin_unlock_irq(&cm_id_priv->lock); 3157 3158 cm_format_sidr_rep_event(work); 3159 cm_process_work(cm_id_priv, work); 3160 return 0; 3161out: 3162 cm_deref_id(cm_id_priv); 3163 return -EINVAL; 3164} 3165 3166static void cm_process_send_error(struct ib_mad_send_buf *msg, 3167 enum ib_wc_status wc_status) 3168{ 3169 struct cm_id_private *cm_id_priv; 3170 struct ib_cm_event cm_event; 3171 enum ib_cm_state state; 3172 int ret; 3173 3174 memset(&cm_event, 0, sizeof cm_event); 3175 cm_id_priv = msg->context[0]; 3176 3177 /* Discard old sends or ones without a response. */ 3178 spin_lock_irq(&cm_id_priv->lock); 3179 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3180 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3181 goto discard; 3182 3183 switch (state) { 3184 case IB_CM_REQ_SENT: 3185 case IB_CM_MRA_REQ_RCVD: 3186 cm_reset_to_idle(cm_id_priv); 3187 cm_event.event = IB_CM_REQ_ERROR; 3188 break; 3189 case IB_CM_REP_SENT: 3190 case IB_CM_MRA_REP_RCVD: 3191 cm_reset_to_idle(cm_id_priv); 3192 cm_event.event = IB_CM_REP_ERROR; 3193 break; 3194 case IB_CM_DREQ_SENT: 3195 cm_enter_timewait(cm_id_priv); 3196 cm_event.event = IB_CM_DREQ_ERROR; 3197 break; 3198 case IB_CM_SIDR_REQ_SENT: 3199 cm_id_priv->id.state = IB_CM_IDLE; 3200 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3201 break; 3202 default: 3203 goto discard; 3204 } 3205 spin_unlock_irq(&cm_id_priv->lock); 3206 cm_event.param.send_status = wc_status; 3207 3208 /* No other events can occur on the cm_id at this point. */ 3209 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3210 cm_free_msg(msg); 3211 if (ret) 3212 ib_destroy_cm_id(&cm_id_priv->id); 3213 return; 3214discard: 3215 spin_unlock_irq(&cm_id_priv->lock); 3216 cm_free_msg(msg); 3217} 3218 3219static void cm_send_handler(struct ib_mad_agent *mad_agent, 3220 struct ib_mad_send_wc *mad_send_wc) 3221{ 3222 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3223 struct cm_port *port; 3224 u16 attr_index; 3225 3226 port = mad_agent->context; 3227 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3228 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3229 3230 /* 3231 * If the send was in response to a received message (context[0] is not 3232 * set to a cm_id), and is not a REJ, then it is a send that was 3233 * manually retried. 3234 */ 3235 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3236 msg->retries = 1; 3237 3238 atomic_long_add(1 + msg->retries, 3239 &port->counter_group[CM_XMIT].counter[attr_index]); 3240 if (msg->retries) 3241 atomic_long_add(msg->retries, 3242 &port->counter_group[CM_XMIT_RETRIES]. 3243 counter[attr_index]); 3244 3245 switch (mad_send_wc->status) { 3246 case IB_WC_SUCCESS: 3247 case IB_WC_WR_FLUSH_ERR: 3248 cm_free_msg(msg); 3249 break; 3250 default: 3251 if (msg->context[0] && msg->context[1]) 3252 cm_process_send_error(msg, mad_send_wc->status); 3253 else 3254 cm_free_msg(msg); 3255 break; 3256 } 3257} 3258 3259static void cm_work_handler(struct work_struct *_work) 3260{ 3261 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3262 int ret; 3263 3264 switch (work->cm_event.event) { 3265 case IB_CM_REQ_RECEIVED: 3266 ret = cm_req_handler(work); 3267 break; 3268 case IB_CM_MRA_RECEIVED: 3269 ret = cm_mra_handler(work); 3270 break; 3271 case IB_CM_REJ_RECEIVED: 3272 ret = cm_rej_handler(work); 3273 break; 3274 case IB_CM_REP_RECEIVED: 3275 ret = cm_rep_handler(work); 3276 break; 3277 case IB_CM_RTU_RECEIVED: 3278 ret = cm_rtu_handler(work); 3279 break; 3280 case IB_CM_USER_ESTABLISHED: 3281 ret = cm_establish_handler(work); 3282 break; 3283 case IB_CM_DREQ_RECEIVED: 3284 ret = cm_dreq_handler(work); 3285 break; 3286 case IB_CM_DREP_RECEIVED: 3287 ret = cm_drep_handler(work); 3288 break; 3289 case IB_CM_SIDR_REQ_RECEIVED: 3290 ret = cm_sidr_req_handler(work); 3291 break; 3292 case IB_CM_SIDR_REP_RECEIVED: 3293 ret = cm_sidr_rep_handler(work); 3294 break; 3295 case IB_CM_LAP_RECEIVED: 3296 ret = cm_lap_handler(work); 3297 break; 3298 case IB_CM_APR_RECEIVED: 3299 ret = cm_apr_handler(work); 3300 break; 3301 case IB_CM_TIMEWAIT_EXIT: 3302 ret = cm_timewait_handler(work); 3303 break; 3304 default: 3305 ret = -EINVAL; 3306 break; 3307 } 3308 if (ret) 3309 cm_free_work(work); 3310} 3311 3312static int cm_establish(struct ib_cm_id *cm_id) 3313{ 3314 struct cm_id_private *cm_id_priv; 3315 struct cm_work *work; 3316 unsigned long flags; 3317 int ret = 0; 3318 3319 work = kmalloc(sizeof *work, GFP_ATOMIC); 3320 if (!work) 3321 return -ENOMEM; 3322 3323 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3324 spin_lock_irqsave(&cm_id_priv->lock, flags); 3325 switch (cm_id->state) 3326 { 3327 case IB_CM_REP_SENT: 3328 case IB_CM_MRA_REP_RCVD: 3329 cm_id->state = IB_CM_ESTABLISHED; 3330 break; 3331 case IB_CM_ESTABLISHED: 3332 ret = -EISCONN; 3333 break; 3334 default: 3335 ret = -EINVAL; 3336 break; 3337 } 3338 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3339 3340 if (ret) { 3341 kfree(work); 3342 goto out; 3343 } 3344 3345 /* 3346 * The CM worker thread may try to destroy the cm_id before it 3347 * can execute this work item. To prevent potential deadlock, 3348 * we need to find the cm_id once we're in the context of the 3349 * worker thread, rather than holding a reference on it. 3350 */ 3351 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3352 work->local_id = cm_id->local_id; 3353 work->remote_id = cm_id->remote_id; 3354 work->mad_recv_wc = NULL; 3355 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3356 queue_delayed_work(cm.wq, &work->work, 0); 3357out: 3358 return ret; 3359} 3360 3361static int cm_migrate(struct ib_cm_id *cm_id) 3362{ 3363 struct cm_id_private *cm_id_priv; 3364 unsigned long flags; 3365 int ret = 0; 3366 3367 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3368 spin_lock_irqsave(&cm_id_priv->lock, flags); 3369 if (cm_id->state == IB_CM_ESTABLISHED && 3370 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3371 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3372 cm_id->lap_state = IB_CM_LAP_IDLE; 3373 cm_id_priv->av = cm_id_priv->alt_av; 3374 } else 3375 ret = -EINVAL; 3376 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3377 3378 return ret; 3379} 3380 3381int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3382{ 3383 int ret; 3384 3385 switch (event) { 3386 case IB_EVENT_COMM_EST: 3387 ret = cm_establish(cm_id); 3388 break; 3389 case IB_EVENT_PATH_MIG: 3390 ret = cm_migrate(cm_id); 3391 break; 3392 default: 3393 ret = -EINVAL; 3394 } 3395 return ret; 3396} 3397EXPORT_SYMBOL(ib_cm_notify); 3398 3399static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3400 struct ib_mad_recv_wc *mad_recv_wc) 3401{ 3402 struct cm_port *port = mad_agent->context; 3403 struct cm_work *work; 3404 enum ib_cm_event_type event; 3405 u16 attr_id; 3406 int paths = 0; 3407 3408 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3409 case CM_REQ_ATTR_ID: 3410 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3411 alt_local_lid != 0); 3412 event = IB_CM_REQ_RECEIVED; 3413 break; 3414 case CM_MRA_ATTR_ID: 3415 event = IB_CM_MRA_RECEIVED; 3416 break; 3417 case CM_REJ_ATTR_ID: 3418 event = IB_CM_REJ_RECEIVED; 3419 break; 3420 case CM_REP_ATTR_ID: 3421 event = IB_CM_REP_RECEIVED; 3422 break; 3423 case CM_RTU_ATTR_ID: 3424 event = IB_CM_RTU_RECEIVED; 3425 break; 3426 case CM_DREQ_ATTR_ID: 3427 event = IB_CM_DREQ_RECEIVED; 3428 break; 3429 case CM_DREP_ATTR_ID: 3430 event = IB_CM_DREP_RECEIVED; 3431 break; 3432 case CM_SIDR_REQ_ATTR_ID: 3433 event = IB_CM_SIDR_REQ_RECEIVED; 3434 break; 3435 case CM_SIDR_REP_ATTR_ID: 3436 event = IB_CM_SIDR_REP_RECEIVED; 3437 break; 3438 case CM_LAP_ATTR_ID: 3439 paths = 1; 3440 event = IB_CM_LAP_RECEIVED; 3441 break; 3442 case CM_APR_ATTR_ID: 3443 event = IB_CM_APR_RECEIVED; 3444 break; 3445 default: 3446 ib_free_recv_mad(mad_recv_wc); 3447 return; 3448 } 3449 3450 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3451 atomic_long_inc(&port->counter_group[CM_RECV]. 3452 counter[attr_id - CM_ATTR_ID_OFFSET]); 3453 3454 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3455 GFP_KERNEL); 3456 if (!work) { 3457 ib_free_recv_mad(mad_recv_wc); 3458 return; 3459 } 3460 3461 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3462 work->cm_event.event = event; 3463 work->mad_recv_wc = mad_recv_wc; 3464 work->port = port; 3465 queue_delayed_work(cm.wq, &work->work, 0); 3466} 3467 3468static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3469 struct ib_qp_attr *qp_attr, 3470 int *qp_attr_mask) 3471{ 3472 unsigned long flags; 3473 int ret; 3474 3475 spin_lock_irqsave(&cm_id_priv->lock, flags); 3476 switch (cm_id_priv->id.state) { 3477 case IB_CM_REQ_SENT: 3478 case IB_CM_MRA_REQ_RCVD: 3479 case IB_CM_REQ_RCVD: 3480 case IB_CM_MRA_REQ_SENT: 3481 case IB_CM_REP_RCVD: 3482 case IB_CM_MRA_REP_SENT: 3483 case IB_CM_REP_SENT: 3484 case IB_CM_MRA_REP_RCVD: 3485 case IB_CM_ESTABLISHED: 3486 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3487 IB_QP_PKEY_INDEX | IB_QP_PORT; 3488 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3489 if (cm_id_priv->responder_resources) 3490 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3491 IB_ACCESS_REMOTE_ATOMIC; 3492 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3493 qp_attr->port_num = cm_id_priv->av.port->port_num; 3494 ret = 0; 3495 break; 3496 default: 3497 ret = -EINVAL; 3498 break; 3499 } 3500 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3501 return ret; 3502} 3503 3504static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3505 struct ib_qp_attr *qp_attr, 3506 int *qp_attr_mask) 3507{ 3508 unsigned long flags; 3509 int ret; 3510 3511 spin_lock_irqsave(&cm_id_priv->lock, flags); 3512 switch (cm_id_priv->id.state) { 3513 case IB_CM_REQ_RCVD: 3514 case IB_CM_MRA_REQ_SENT: 3515 case IB_CM_REP_RCVD: 3516 case IB_CM_MRA_REP_SENT: 3517 case IB_CM_REP_SENT: 3518 case IB_CM_MRA_REP_RCVD: 3519 case IB_CM_ESTABLISHED: 3520 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3521 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3522 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3523 qp_attr->path_mtu = cm_id_priv->path_mtu; 3524 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3525 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3526 if (cm_id_priv->qp_type == IB_QPT_RC) { 3527 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3528 IB_QP_MIN_RNR_TIMER; 3529 qp_attr->max_dest_rd_atomic = 3530 cm_id_priv->responder_resources; 3531 qp_attr->min_rnr_timer = 0; 3532 } 3533 if (cm_id_priv->alt_av.ah_attr.dlid) { 3534 *qp_attr_mask |= IB_QP_ALT_PATH; 3535 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3536 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3537 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3538 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3539 } 3540 ret = 0; 3541 break; 3542 default: 3543 ret = -EINVAL; 3544 break; 3545 } 3546 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3547 return ret; 3548} 3549 3550static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3551 struct ib_qp_attr *qp_attr, 3552 int *qp_attr_mask) 3553{ 3554 unsigned long flags; 3555 int ret; 3556 3557 spin_lock_irqsave(&cm_id_priv->lock, flags); 3558 switch (cm_id_priv->id.state) { 3559 /* Allow transition to RTS before sending REP */ 3560 case IB_CM_REQ_RCVD: 3561 case IB_CM_MRA_REQ_SENT: 3562 3563 case IB_CM_REP_RCVD: 3564 case IB_CM_MRA_REP_SENT: 3565 case IB_CM_REP_SENT: 3566 case IB_CM_MRA_REP_RCVD: 3567 case IB_CM_ESTABLISHED: 3568 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3569 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3570 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3571 if (cm_id_priv->qp_type == IB_QPT_RC) { 3572 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3573 IB_QP_RNR_RETRY | 3574 IB_QP_MAX_QP_RD_ATOMIC; 3575 qp_attr->timeout = cm_id_priv->av.timeout; 3576 qp_attr->retry_cnt = cm_id_priv->retry_count; 3577 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3578 qp_attr->max_rd_atomic = 3579 cm_id_priv->initiator_depth; 3580 } 3581 if (cm_id_priv->alt_av.ah_attr.dlid) { 3582 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3583 qp_attr->path_mig_state = IB_MIG_REARM; 3584 } 3585 } else { 3586 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3587 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3588 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3589 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3590 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3591 qp_attr->path_mig_state = IB_MIG_REARM; 3592 } 3593 ret = 0; 3594 break; 3595 default: 3596 ret = -EINVAL; 3597 break; 3598 } 3599 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3600 return ret; 3601} 3602 3603int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3604 struct ib_qp_attr *qp_attr, 3605 int *qp_attr_mask) 3606{ 3607 struct cm_id_private *cm_id_priv; 3608 int ret; 3609 3610 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3611 switch (qp_attr->qp_state) { 3612 case IB_QPS_INIT: 3613 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3614 break; 3615 case IB_QPS_RTR: 3616 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3617 break; 3618 case IB_QPS_RTS: 3619 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3620 break; 3621 default: 3622 ret = -EINVAL; 3623 break; 3624 } 3625 return ret; 3626} 3627EXPORT_SYMBOL(ib_cm_init_qp_attr); 3628 3629static void cm_get_ack_delay(struct cm_device *cm_dev) 3630{ 3631 struct ib_device_attr attr; 3632 3633 if (ib_query_device(cm_dev->ib_device, &attr)) 3634 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3635 else 3636 cm_dev->ack_delay = attr.local_ca_ack_delay; 3637} 3638 3639static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3640 char *buf) 3641{ 3642 struct cm_counter_group *group; 3643 struct cm_counter_attribute *cm_attr; 3644 3645 group = container_of(obj, struct cm_counter_group, obj); 3646 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3647 3648 return sprintf(buf, "%ld\n", 3649 atomic_long_read(&group->counter[cm_attr->index])); 3650} 3651 3652static struct sysfs_ops cm_counter_ops = { 3653 .show = cm_show_counter 3654}; 3655 3656static struct kobj_type cm_counter_obj_type = { 3657 .sysfs_ops = &cm_counter_ops, 3658 .default_attrs = cm_counter_default_attrs 3659}; 3660 3661static void cm_release_port_obj(struct kobject *obj) 3662{ 3663 struct cm_port *cm_port; 3664 3665 cm_port = container_of(obj, struct cm_port, port_obj); 3666 kfree(cm_port); 3667} 3668 3669static struct kobj_type cm_port_obj_type = { 3670 .release = cm_release_port_obj 3671}; 3672 3673struct class cm_class = { 3674 .name = "infiniband_cm", 3675}; 3676EXPORT_SYMBOL(cm_class); 3677 3678static int cm_create_port_fs(struct cm_port *port) 3679{ 3680 int i, ret; 3681 3682 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3683 &port->cm_dev->device->kobj, 3684 "%d", port->port_num); 3685 if (ret) { 3686 kfree(port); 3687 return ret; 3688 } 3689 3690 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3691 ret = kobject_init_and_add(&port->counter_group[i].obj, 3692 &cm_counter_obj_type, 3693 &port->port_obj, 3694 "%s", counter_group_names[i]); 3695 if (ret) 3696 goto error; 3697 } 3698 3699 return 0; 3700 3701error: 3702 while (i--) 3703 kobject_put(&port->counter_group[i].obj); 3704 kobject_put(&port->port_obj); 3705 return ret; 3706 3707} 3708 3709static void cm_remove_port_fs(struct cm_port *port) 3710{ 3711 int i; 3712 3713 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3714 kobject_put(&port->counter_group[i].obj); 3715 3716 kobject_put(&port->port_obj); 3717} 3718 3719static void cm_add_one(struct ib_device *ib_device) 3720{ 3721 struct cm_device *cm_dev; 3722 struct cm_port *port; 3723 struct ib_mad_reg_req reg_req = { 3724 .mgmt_class = IB_MGMT_CLASS_CM, 3725 .mgmt_class_version = IB_CM_CLASS_VERSION 3726 }; 3727 struct ib_port_modify port_modify = { 3728 .set_port_cap_mask = IB_PORT_CM_SUP 3729 }; 3730 unsigned long flags; 3731 int ret; 3732 u8 i; 3733 3734 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3735 return; 3736 3737 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3738 ib_device->phys_port_cnt, GFP_KERNEL); 3739 if (!cm_dev) 3740 return; 3741 3742 cm_dev->ib_device = ib_device; 3743 cm_get_ack_delay(cm_dev); 3744 3745 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3746 MKDEV(0, 0), NULL, 3747 "%s", ib_device->name); 3748 if (!cm_dev->device) { 3749 kfree(cm_dev); 3750 return; 3751 } 3752 3753 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3754 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3755 port = kzalloc(sizeof *port, GFP_KERNEL); 3756 if (!port) 3757 goto error1; 3758 3759 cm_dev->port[i-1] = port; 3760 port->cm_dev = cm_dev; 3761 port->port_num = i; 3762 3763 ret = cm_create_port_fs(port); 3764 if (ret) 3765 goto error1; 3766 3767 port->mad_agent = ib_register_mad_agent(ib_device, i, 3768 IB_QPT_GSI, 3769 ®_req, 3770 0, 3771 cm_send_handler, 3772 cm_recv_handler, 3773 port); 3774 if (IS_ERR(port->mad_agent)) 3775 goto error2; 3776 3777 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3778 if (ret) 3779 goto error3; 3780 } 3781 ib_set_client_data(ib_device, &cm_client, cm_dev); 3782 3783 write_lock_irqsave(&cm.device_lock, flags); 3784 list_add_tail(&cm_dev->list, &cm.device_list); 3785 write_unlock_irqrestore(&cm.device_lock, flags); 3786 return; 3787 3788error3: 3789 ib_unregister_mad_agent(port->mad_agent); 3790error2: 3791 cm_remove_port_fs(port); 3792error1: 3793 port_modify.set_port_cap_mask = 0; 3794 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3795 while (--i) { 3796 port = cm_dev->port[i-1]; 3797 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3798 ib_unregister_mad_agent(port->mad_agent); 3799 cm_remove_port_fs(port); 3800 } 3801 device_unregister(cm_dev->device); 3802 kfree(cm_dev); 3803} 3804 3805static void cm_remove_one(struct ib_device *ib_device) 3806{ 3807 struct cm_device *cm_dev; 3808 struct cm_port *port; 3809 struct ib_port_modify port_modify = { 3810 .clr_port_cap_mask = IB_PORT_CM_SUP 3811 }; 3812 unsigned long flags; 3813 int i; 3814 3815 cm_dev = ib_get_client_data(ib_device, &cm_client); 3816 if (!cm_dev) 3817 return; 3818 3819 write_lock_irqsave(&cm.device_lock, flags); 3820 list_del(&cm_dev->list); 3821 write_unlock_irqrestore(&cm.device_lock, flags); 3822 3823 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3824 port = cm_dev->port[i-1]; 3825 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3826 ib_unregister_mad_agent(port->mad_agent); 3827 flush_workqueue(cm.wq); 3828 cm_remove_port_fs(port); 3829 } 3830 device_unregister(cm_dev->device); 3831 kfree(cm_dev); 3832} 3833 3834static int __init ib_cm_init(void) 3835{ 3836 int ret; 3837 3838 memset(&cm, 0, sizeof cm); 3839 INIT_LIST_HEAD(&cm.device_list); 3840 rwlock_init(&cm.device_lock); 3841 spin_lock_init(&cm.lock); 3842 cm.listen_service_table = RB_ROOT; 3843 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3844 cm.remote_id_table = RB_ROOT; 3845 cm.remote_qp_table = RB_ROOT; 3846 cm.remote_sidr_table = RB_ROOT; 3847 idr_init(&cm.local_id_table); 3848 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3849 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3850 INIT_LIST_HEAD(&cm.timewait_list); 3851 3852 ret = class_register(&cm_class); 3853 if (ret) 3854 return -ENOMEM; 3855 3856 cm.wq = create_workqueue("ib_cm"); 3857 if (!cm.wq) { 3858 ret = -ENOMEM; 3859 goto error1; 3860 } 3861 3862 ret = ib_register_client(&cm_client); 3863 if (ret) 3864 goto error2; 3865 3866 return 0; 3867error2: 3868 destroy_workqueue(cm.wq); 3869error1: 3870 class_unregister(&cm_class); 3871 return ret; 3872} 3873 3874static void __exit ib_cm_cleanup(void) 3875{ 3876 struct cm_timewait_info *timewait_info, *tmp; 3877 3878 spin_lock_irq(&cm.lock); 3879 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3880 cancel_delayed_work(&timewait_info->work.work); 3881 spin_unlock_irq(&cm.lock); 3882 3883 ib_unregister_client(&cm_client); 3884 destroy_workqueue(cm.wq); 3885 3886 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3887 list_del(&timewait_info->list); 3888 kfree(timewait_info); 3889 } 3890 3891 class_unregister(&cm_class); 3892 idr_destroy(&cm.local_id_table); 3893} 3894 3895module_init_order(ib_cm_init, SI_ORDER_SECOND); 3896module_exit_order(ib_cm_cleanup, SI_ORDER_FIRST); 3897 3898