cm.c revision b2bc4782191cb574924a1d09f48083ea8b33a93b
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/slab.h> 46#include <linux/sysfs.h> 47#include <linux/workqueue.h> 48#include <linux/kdev_t.h> 49 50#include <rdma/ib_cache.h> 51#include <rdma/ib_cm.h> 52#include "cm_msgs.h" 53 54MODULE_AUTHOR("Sean Hefty"); 55MODULE_DESCRIPTION("InfiniBand CM"); 56MODULE_LICENSE("Dual BSD/GPL"); 57 58static void cm_add_one(struct ib_device *device); 59static void cm_remove_one(struct ib_device *device); 60 61static struct ib_client cm_client = { 62 .name = "cm", 63 .add = cm_add_one, 64 .remove = cm_remove_one 65}; 66 67static struct ib_cm { 68 spinlock_t lock; 69 struct list_head device_list; 70 rwlock_t device_lock; 71 struct rb_root listen_service_table; 72 u64 listen_service_id; 73 /* struct rb_root peer_service_table; todo: fix peer to peer */ 74 struct rb_root remote_qp_table; 75 struct rb_root remote_id_table; 76 struct rb_root remote_sidr_table; 77 struct idr local_id_table; 78 __be32 random_id_operand; 79 struct list_head timewait_list; 80 struct workqueue_struct *wq; 81} cm; 82 83/* Counter indexes ordered by attribute ID */ 84enum { 85 CM_REQ_COUNTER, 86 CM_MRA_COUNTER, 87 CM_REJ_COUNTER, 88 CM_REP_COUNTER, 89 CM_RTU_COUNTER, 90 CM_DREQ_COUNTER, 91 CM_DREP_COUNTER, 92 CM_SIDR_REQ_COUNTER, 93 CM_SIDR_REP_COUNTER, 94 CM_LAP_COUNTER, 95 CM_APR_COUNTER, 96 CM_ATTR_COUNT, 97 CM_ATTR_ID_OFFSET = 0x0010, 98}; 99 100enum { 101 CM_XMIT, 102 CM_XMIT_RETRIES, 103 CM_RECV, 104 CM_RECV_DUPLICATES, 105 CM_COUNTER_GROUPS 106}; 107 108static char const counter_group_names[CM_COUNTER_GROUPS] 109 [sizeof("cm_rx_duplicates")] = { 110 "cm_tx_msgs", "cm_tx_retries", 111 "cm_rx_msgs", "cm_rx_duplicates" 112}; 113 114struct cm_counter_group { 115 struct kobject obj; 116 atomic_long_t counter[CM_ATTR_COUNT]; 117}; 118 119struct cm_counter_attribute { 120 struct attribute attr; 121 int index; 122}; 123 124#define CM_COUNTER_ATTR(_name, _index) \ 125struct cm_counter_attribute cm_##_name##_counter_attr = { \ 126 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 127 .index = _index \ 128} 129 130static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 131static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 132static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 133static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 134static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 135static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 136static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 137static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 138static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 139static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 140static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 141 142static struct attribute *cm_counter_default_attrs[] = { 143 &cm_req_counter_attr.attr, 144 &cm_mra_counter_attr.attr, 145 &cm_rej_counter_attr.attr, 146 &cm_rep_counter_attr.attr, 147 &cm_rtu_counter_attr.attr, 148 &cm_dreq_counter_attr.attr, 149 &cm_drep_counter_attr.attr, 150 &cm_sidr_req_counter_attr.attr, 151 &cm_sidr_rep_counter_attr.attr, 152 &cm_lap_counter_attr.attr, 153 &cm_apr_counter_attr.attr, 154 NULL 155}; 156 157struct cm_port { 158 struct cm_device *cm_dev; 159 struct ib_mad_agent *mad_agent; 160 struct kobject port_obj; 161 u8 port_num; 162 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 163}; 164 165struct cm_device { 166 struct list_head list; 167 struct ib_device *ib_device; 168 struct device *device; 169 u8 ack_delay; 170 struct cm_port *port[0]; 171}; 172 173struct cm_av { 174 struct cm_port *port; 175 union ib_gid dgid; 176 struct ib_ah_attr ah_attr; 177 u16 pkey_index; 178 u8 timeout; 179}; 180 181struct cm_work { 182 struct delayed_work work; 183 struct list_head list; 184 struct cm_port *port; 185 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 186 __be32 local_id; /* Established / timewait */ 187 __be32 remote_id; 188 struct ib_cm_event cm_event; 189 struct ib_sa_path_rec path[0]; 190}; 191 192struct cm_timewait_info { 193 struct cm_work work; /* Must be first. */ 194 struct list_head list; 195 struct rb_node remote_qp_node; 196 struct rb_node remote_id_node; 197 __be64 remote_ca_guid; 198 __be32 remote_qpn; 199 u8 inserted_remote_qp; 200 u8 inserted_remote_id; 201}; 202 203struct cm_id_private { 204 struct ib_cm_id id; 205 206 struct rb_node service_node; 207 struct rb_node sidr_id_node; 208 spinlock_t lock; /* Do not acquire inside cm.lock */ 209 struct completion comp; 210 atomic_t refcount; 211 212 struct ib_mad_send_buf *msg; 213 struct cm_timewait_info *timewait_info; 214 /* todo: use alternate port on send failure */ 215 struct cm_av av; 216 struct cm_av alt_av; 217 struct ib_cm_compare_data *compare_data; 218 219 void *private_data; 220 __be64 tid; 221 __be32 local_qpn; 222 __be32 remote_qpn; 223 enum ib_qp_type qp_type; 224 __be32 sq_psn; 225 __be32 rq_psn; 226 int timeout_ms; 227 enum ib_mtu path_mtu; 228 __be16 pkey; 229 u8 private_data_len; 230 u8 max_cm_retries; 231 u8 peer_to_peer; 232 u8 responder_resources; 233 u8 initiator_depth; 234 u8 retry_count; 235 u8 rnr_retry_count; 236 u8 service_timeout; 237 u8 target_ack_delay; 238 239 struct list_head work_list; 240 atomic_t work_count; 241}; 242 243static void cm_work_handler(struct work_struct *work); 244 245static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 246{ 247 if (atomic_dec_and_test(&cm_id_priv->refcount)) 248 complete(&cm_id_priv->comp); 249} 250 251static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 252 struct ib_mad_send_buf **msg) 253{ 254 struct ib_mad_agent *mad_agent; 255 struct ib_mad_send_buf *m; 256 struct ib_ah *ah; 257 258 mad_agent = cm_id_priv->av.port->mad_agent; 259 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 260 if (IS_ERR(ah)) 261 return PTR_ERR(ah); 262 263 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 264 cm_id_priv->av.pkey_index, 265 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 266 GFP_ATOMIC); 267 if (IS_ERR(m)) { 268 ib_destroy_ah(ah); 269 return PTR_ERR(m); 270 } 271 272 /* Timeout set by caller if response is expected. */ 273 m->ah = ah; 274 m->retries = cm_id_priv->max_cm_retries; 275 276 atomic_inc(&cm_id_priv->refcount); 277 m->context[0] = cm_id_priv; 278 *msg = m; 279 return 0; 280} 281 282static int cm_alloc_response_msg(struct cm_port *port, 283 struct ib_mad_recv_wc *mad_recv_wc, 284 struct ib_mad_send_buf **msg) 285{ 286 struct ib_mad_send_buf *m; 287 struct ib_ah *ah; 288 289 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 290 mad_recv_wc->recv_buf.grh, port->port_num); 291 if (IS_ERR(ah)) 292 return PTR_ERR(ah); 293 294 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 295 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 296 GFP_ATOMIC); 297 if (IS_ERR(m)) { 298 ib_destroy_ah(ah); 299 return PTR_ERR(m); 300 } 301 m->ah = ah; 302 *msg = m; 303 return 0; 304} 305 306static void cm_free_msg(struct ib_mad_send_buf *msg) 307{ 308 ib_destroy_ah(msg->ah); 309 if (msg->context[0]) 310 cm_deref_id(msg->context[0]); 311 ib_free_send_mad(msg); 312} 313 314static void * cm_copy_private_data(const void *private_data, 315 u8 private_data_len) 316{ 317 void *data; 318 319 if (!private_data || !private_data_len) 320 return NULL; 321 322 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 323 if (!data) 324 return ERR_PTR(-ENOMEM); 325 326 return data; 327} 328 329static void cm_set_private_data(struct cm_id_private *cm_id_priv, 330 void *private_data, u8 private_data_len) 331{ 332 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 333 kfree(cm_id_priv->private_data); 334 335 cm_id_priv->private_data = private_data; 336 cm_id_priv->private_data_len = private_data_len; 337} 338 339static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 340 struct ib_grh *grh, struct cm_av *av) 341{ 342 av->port = port; 343 av->pkey_index = wc->pkey_index; 344 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 345 grh, &av->ah_attr); 346} 347 348static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 349{ 350 struct cm_device *cm_dev; 351 struct cm_port *port = NULL; 352 unsigned long flags; 353 int ret; 354 u8 p; 355 356 read_lock_irqsave(&cm.device_lock, flags); 357 list_for_each_entry(cm_dev, &cm.device_list, list) { 358 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 359 &p, NULL)) { 360 port = cm_dev->port[p-1]; 361 break; 362 } 363 } 364 read_unlock_irqrestore(&cm.device_lock, flags); 365 366 if (!port) 367 return -EINVAL; 368 369 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 370 be16_to_cpu(path->pkey), &av->pkey_index); 371 if (ret) 372 return ret; 373 374 av->port = port; 375 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path, 376 &av->ah_attr); 377 av->timeout = path->packet_life_time + 1; 378 return 0; 379} 380 381static int cm_alloc_id(struct cm_id_private *cm_id_priv) 382{ 383 unsigned long flags; 384 int ret, id; 385 static int next_id; 386 387 do { 388 spin_lock_irqsave(&cm.lock, flags); 389 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 390 next_id, &id); 391 if (!ret) 392 next_id = ((unsigned) id + 1) & MAX_ID_MASK; 393 spin_unlock_irqrestore(&cm.lock, flags); 394 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 395 396 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 397 return ret; 398} 399 400static void cm_free_id(__be32 local_id) 401{ 402 spin_lock_irq(&cm.lock); 403 idr_remove(&cm.local_id_table, 404 (__force int) (local_id ^ cm.random_id_operand)); 405 spin_unlock_irq(&cm.lock); 406} 407 408static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 409{ 410 struct cm_id_private *cm_id_priv; 411 412 cm_id_priv = idr_find(&cm.local_id_table, 413 (__force int) (local_id ^ cm.random_id_operand)); 414 if (cm_id_priv) { 415 if (cm_id_priv->id.remote_id == remote_id) 416 atomic_inc(&cm_id_priv->refcount); 417 else 418 cm_id_priv = NULL; 419 } 420 421 return cm_id_priv; 422} 423 424static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 425{ 426 struct cm_id_private *cm_id_priv; 427 428 spin_lock_irq(&cm.lock); 429 cm_id_priv = cm_get_id(local_id, remote_id); 430 spin_unlock_irq(&cm.lock); 431 432 return cm_id_priv; 433} 434 435static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 436{ 437 int i; 438 439 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 440 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 441 ((unsigned long *) mask)[i]; 442} 443 444static int cm_compare_data(struct ib_cm_compare_data *src_data, 445 struct ib_cm_compare_data *dst_data) 446{ 447 u8 src[IB_CM_COMPARE_SIZE]; 448 u8 dst[IB_CM_COMPARE_SIZE]; 449 450 if (!src_data || !dst_data) 451 return 0; 452 453 cm_mask_copy(src, src_data->data, dst_data->mask); 454 cm_mask_copy(dst, dst_data->data, src_data->mask); 455 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 456} 457 458static int cm_compare_private_data(u8 *private_data, 459 struct ib_cm_compare_data *dst_data) 460{ 461 u8 src[IB_CM_COMPARE_SIZE]; 462 463 if (!dst_data) 464 return 0; 465 466 cm_mask_copy(src, private_data, dst_data->mask); 467 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 468} 469 470/* 471 * Trivial helpers to strip endian annotation and compare; the 472 * endianness doesn't actually matter since we just need a stable 473 * order for the RB tree. 474 */ 475static int be32_lt(__be32 a, __be32 b) 476{ 477 return (__force u32) a < (__force u32) b; 478} 479 480static int be32_gt(__be32 a, __be32 b) 481{ 482 return (__force u32) a > (__force u32) b; 483} 484 485static int be64_lt(__be64 a, __be64 b) 486{ 487 return (__force u64) a < (__force u64) b; 488} 489 490static int be64_gt(__be64 a, __be64 b) 491{ 492 return (__force u64) a > (__force u64) b; 493} 494 495static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 496{ 497 struct rb_node **link = &cm.listen_service_table.rb_node; 498 struct rb_node *parent = NULL; 499 struct cm_id_private *cur_cm_id_priv; 500 __be64 service_id = cm_id_priv->id.service_id; 501 __be64 service_mask = cm_id_priv->id.service_mask; 502 int data_cmp; 503 504 while (*link) { 505 parent = *link; 506 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 507 service_node); 508 data_cmp = cm_compare_data(cm_id_priv->compare_data, 509 cur_cm_id_priv->compare_data); 510 if ((cur_cm_id_priv->id.service_mask & service_id) == 511 (service_mask & cur_cm_id_priv->id.service_id) && 512 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 513 !data_cmp) 514 return cur_cm_id_priv; 515 516 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 517 link = &(*link)->rb_left; 518 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 519 link = &(*link)->rb_right; 520 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 521 link = &(*link)->rb_left; 522 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 523 link = &(*link)->rb_right; 524 else if (data_cmp < 0) 525 link = &(*link)->rb_left; 526 else 527 link = &(*link)->rb_right; 528 } 529 rb_link_node(&cm_id_priv->service_node, parent, link); 530 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 531 return NULL; 532} 533 534static struct cm_id_private * cm_find_listen(struct ib_device *device, 535 __be64 service_id, 536 u8 *private_data) 537{ 538 struct rb_node *node = cm.listen_service_table.rb_node; 539 struct cm_id_private *cm_id_priv; 540 int data_cmp; 541 542 while (node) { 543 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 544 data_cmp = cm_compare_private_data(private_data, 545 cm_id_priv->compare_data); 546 if ((cm_id_priv->id.service_mask & service_id) == 547 cm_id_priv->id.service_id && 548 (cm_id_priv->id.device == device) && !data_cmp) 549 return cm_id_priv; 550 551 if (device < cm_id_priv->id.device) 552 node = node->rb_left; 553 else if (device > cm_id_priv->id.device) 554 node = node->rb_right; 555 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 556 node = node->rb_left; 557 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 558 node = node->rb_right; 559 else if (data_cmp < 0) 560 node = node->rb_left; 561 else 562 node = node->rb_right; 563 } 564 return NULL; 565} 566 567static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 568 *timewait_info) 569{ 570 struct rb_node **link = &cm.remote_id_table.rb_node; 571 struct rb_node *parent = NULL; 572 struct cm_timewait_info *cur_timewait_info; 573 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 574 __be32 remote_id = timewait_info->work.remote_id; 575 576 while (*link) { 577 parent = *link; 578 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 579 remote_id_node); 580 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 581 link = &(*link)->rb_left; 582 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 583 link = &(*link)->rb_right; 584 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 585 link = &(*link)->rb_left; 586 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 587 link = &(*link)->rb_right; 588 else 589 return cur_timewait_info; 590 } 591 timewait_info->inserted_remote_id = 1; 592 rb_link_node(&timewait_info->remote_id_node, parent, link); 593 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 594 return NULL; 595} 596 597static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 598 __be32 remote_id) 599{ 600 struct rb_node *node = cm.remote_id_table.rb_node; 601 struct cm_timewait_info *timewait_info; 602 603 while (node) { 604 timewait_info = rb_entry(node, struct cm_timewait_info, 605 remote_id_node); 606 if (be32_lt(remote_id, timewait_info->work.remote_id)) 607 node = node->rb_left; 608 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 609 node = node->rb_right; 610 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 611 node = node->rb_left; 612 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 613 node = node->rb_right; 614 else 615 return timewait_info; 616 } 617 return NULL; 618} 619 620static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 621 *timewait_info) 622{ 623 struct rb_node **link = &cm.remote_qp_table.rb_node; 624 struct rb_node *parent = NULL; 625 struct cm_timewait_info *cur_timewait_info; 626 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 627 __be32 remote_qpn = timewait_info->remote_qpn; 628 629 while (*link) { 630 parent = *link; 631 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 632 remote_qp_node); 633 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 634 link = &(*link)->rb_left; 635 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 636 link = &(*link)->rb_right; 637 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 638 link = &(*link)->rb_left; 639 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 640 link = &(*link)->rb_right; 641 else 642 return cur_timewait_info; 643 } 644 timewait_info->inserted_remote_qp = 1; 645 rb_link_node(&timewait_info->remote_qp_node, parent, link); 646 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 647 return NULL; 648} 649 650static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 651 *cm_id_priv) 652{ 653 struct rb_node **link = &cm.remote_sidr_table.rb_node; 654 struct rb_node *parent = NULL; 655 struct cm_id_private *cur_cm_id_priv; 656 union ib_gid *port_gid = &cm_id_priv->av.dgid; 657 __be32 remote_id = cm_id_priv->id.remote_id; 658 659 while (*link) { 660 parent = *link; 661 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 662 sidr_id_node); 663 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 664 link = &(*link)->rb_left; 665 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 666 link = &(*link)->rb_right; 667 else { 668 int cmp; 669 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 670 sizeof *port_gid); 671 if (cmp < 0) 672 link = &(*link)->rb_left; 673 else if (cmp > 0) 674 link = &(*link)->rb_right; 675 else 676 return cur_cm_id_priv; 677 } 678 } 679 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 680 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 681 return NULL; 682} 683 684static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 685 enum ib_cm_sidr_status status) 686{ 687 struct ib_cm_sidr_rep_param param; 688 689 memset(¶m, 0, sizeof param); 690 param.status = status; 691 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 692} 693 694struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 695 ib_cm_handler cm_handler, 696 void *context) 697{ 698 struct cm_id_private *cm_id_priv; 699 int ret; 700 701 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 702 if (!cm_id_priv) 703 return ERR_PTR(-ENOMEM); 704 705 cm_id_priv->id.state = IB_CM_IDLE; 706 cm_id_priv->id.device = device; 707 cm_id_priv->id.cm_handler = cm_handler; 708 cm_id_priv->id.context = context; 709 cm_id_priv->id.remote_cm_qpn = 1; 710 ret = cm_alloc_id(cm_id_priv); 711 if (ret) 712 goto error; 713 714 spin_lock_init(&cm_id_priv->lock); 715 init_completion(&cm_id_priv->comp); 716 INIT_LIST_HEAD(&cm_id_priv->work_list); 717 atomic_set(&cm_id_priv->work_count, -1); 718 atomic_set(&cm_id_priv->refcount, 1); 719 return &cm_id_priv->id; 720 721error: 722 kfree(cm_id_priv); 723 return ERR_PTR(-ENOMEM); 724} 725EXPORT_SYMBOL(ib_create_cm_id); 726 727static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 728{ 729 struct cm_work *work; 730 731 if (list_empty(&cm_id_priv->work_list)) 732 return NULL; 733 734 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 735 list_del(&work->list); 736 return work; 737} 738 739static void cm_free_work(struct cm_work *work) 740{ 741 if (work->mad_recv_wc) 742 ib_free_recv_mad(work->mad_recv_wc); 743 kfree(work); 744} 745 746static inline int cm_convert_to_ms(int iba_time) 747{ 748 /* approximate conversion to ms from 4.096us x 2^iba_time */ 749 return 1 << max(iba_time - 8, 0); 750} 751 752/* 753 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 754 * Because of how ack_timeout is stored, adding one doubles the timeout. 755 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 756 * increment it (round up) only if the other is within 50%. 757 */ 758static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 759{ 760 int ack_timeout = packet_life_time + 1; 761 762 if (ack_timeout >= ca_ack_delay) 763 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 764 else 765 ack_timeout = ca_ack_delay + 766 (ack_timeout >= (ca_ack_delay - 1)); 767 768 return min(31, ack_timeout); 769} 770 771static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 772{ 773 if (timewait_info->inserted_remote_id) { 774 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 775 timewait_info->inserted_remote_id = 0; 776 } 777 778 if (timewait_info->inserted_remote_qp) { 779 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 780 timewait_info->inserted_remote_qp = 0; 781 } 782} 783 784static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 785{ 786 struct cm_timewait_info *timewait_info; 787 788 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 789 if (!timewait_info) 790 return ERR_PTR(-ENOMEM); 791 792 timewait_info->work.local_id = local_id; 793 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 794 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 795 return timewait_info; 796} 797 798static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 799{ 800 int wait_time; 801 unsigned long flags; 802 803 spin_lock_irqsave(&cm.lock, flags); 804 cm_cleanup_timewait(cm_id_priv->timewait_info); 805 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 806 spin_unlock_irqrestore(&cm.lock, flags); 807 808 /* 809 * The cm_id could be destroyed by the user before we exit timewait. 810 * To protect against this, we search for the cm_id after exiting 811 * timewait before notifying the user that we've exited timewait. 812 */ 813 cm_id_priv->id.state = IB_CM_TIMEWAIT; 814 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 815 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 816 msecs_to_jiffies(wait_time)); 817 cm_id_priv->timewait_info = NULL; 818} 819 820static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 821{ 822 unsigned long flags; 823 824 cm_id_priv->id.state = IB_CM_IDLE; 825 if (cm_id_priv->timewait_info) { 826 spin_lock_irqsave(&cm.lock, flags); 827 cm_cleanup_timewait(cm_id_priv->timewait_info); 828 spin_unlock_irqrestore(&cm.lock, flags); 829 kfree(cm_id_priv->timewait_info); 830 cm_id_priv->timewait_info = NULL; 831 } 832} 833 834static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 835{ 836 struct cm_id_private *cm_id_priv; 837 struct cm_work *work; 838 839 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 840retest: 841 spin_lock_irq(&cm_id_priv->lock); 842 switch (cm_id->state) { 843 case IB_CM_LISTEN: 844 cm_id->state = IB_CM_IDLE; 845 spin_unlock_irq(&cm_id_priv->lock); 846 spin_lock_irq(&cm.lock); 847 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 848 spin_unlock_irq(&cm.lock); 849 break; 850 case IB_CM_SIDR_REQ_SENT: 851 cm_id->state = IB_CM_IDLE; 852 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 853 spin_unlock_irq(&cm_id_priv->lock); 854 break; 855 case IB_CM_SIDR_REQ_RCVD: 856 spin_unlock_irq(&cm_id_priv->lock); 857 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 858 break; 859 case IB_CM_REQ_SENT: 860 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 861 spin_unlock_irq(&cm_id_priv->lock); 862 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 863 &cm_id_priv->id.device->node_guid, 864 sizeof cm_id_priv->id.device->node_guid, 865 NULL, 0); 866 break; 867 case IB_CM_REQ_RCVD: 868 if (err == -ENOMEM) { 869 /* Do not reject to allow future retries. */ 870 cm_reset_to_idle(cm_id_priv); 871 spin_unlock_irq(&cm_id_priv->lock); 872 } else { 873 spin_unlock_irq(&cm_id_priv->lock); 874 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 875 NULL, 0, NULL, 0); 876 } 877 break; 878 case IB_CM_MRA_REQ_RCVD: 879 case IB_CM_REP_SENT: 880 case IB_CM_MRA_REP_RCVD: 881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 882 /* Fall through */ 883 case IB_CM_MRA_REQ_SENT: 884 case IB_CM_REP_RCVD: 885 case IB_CM_MRA_REP_SENT: 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 break; 890 case IB_CM_ESTABLISHED: 891 spin_unlock_irq(&cm_id_priv->lock); 892 ib_send_cm_dreq(cm_id, NULL, 0); 893 goto retest; 894 case IB_CM_DREQ_SENT: 895 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 896 cm_enter_timewait(cm_id_priv); 897 spin_unlock_irq(&cm_id_priv->lock); 898 break; 899 case IB_CM_DREQ_RCVD: 900 spin_unlock_irq(&cm_id_priv->lock); 901 ib_send_cm_drep(cm_id, NULL, 0); 902 break; 903 default: 904 spin_unlock_irq(&cm_id_priv->lock); 905 break; 906 } 907 908 cm_free_id(cm_id->local_id); 909 cm_deref_id(cm_id_priv); 910 wait_for_completion(&cm_id_priv->comp); 911 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 912 cm_free_work(work); 913 kfree(cm_id_priv->compare_data); 914 kfree(cm_id_priv->private_data); 915 kfree(cm_id_priv); 916} 917 918void ib_destroy_cm_id(struct ib_cm_id *cm_id) 919{ 920 cm_destroy_id(cm_id, 0); 921} 922EXPORT_SYMBOL(ib_destroy_cm_id); 923 924int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 925 struct ib_cm_compare_data *compare_data) 926{ 927 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 928 unsigned long flags; 929 int ret = 0; 930 931 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 932 service_id &= service_mask; 933 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 934 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 935 return -EINVAL; 936 937 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 938 if (cm_id->state != IB_CM_IDLE) 939 return -EINVAL; 940 941 if (compare_data) { 942 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 943 GFP_KERNEL); 944 if (!cm_id_priv->compare_data) 945 return -ENOMEM; 946 cm_mask_copy(cm_id_priv->compare_data->data, 947 compare_data->data, compare_data->mask); 948 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 949 IB_CM_COMPARE_SIZE); 950 } 951 952 cm_id->state = IB_CM_LISTEN; 953 954 spin_lock_irqsave(&cm.lock, flags); 955 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 956 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 957 cm_id->service_mask = ~cpu_to_be64(0); 958 } else { 959 cm_id->service_id = service_id; 960 cm_id->service_mask = service_mask; 961 } 962 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 963 spin_unlock_irqrestore(&cm.lock, flags); 964 965 if (cur_cm_id_priv) { 966 cm_id->state = IB_CM_IDLE; 967 kfree(cm_id_priv->compare_data); 968 cm_id_priv->compare_data = NULL; 969 ret = -EBUSY; 970 } 971 return ret; 972} 973EXPORT_SYMBOL(ib_cm_listen); 974 975static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 976 enum cm_msg_sequence msg_seq) 977{ 978 u64 hi_tid, low_tid; 979 980 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 981 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 982 (msg_seq << 30)); 983 return cpu_to_be64(hi_tid | low_tid); 984} 985 986static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 987 __be16 attr_id, __be64 tid) 988{ 989 hdr->base_version = IB_MGMT_BASE_VERSION; 990 hdr->mgmt_class = IB_MGMT_CLASS_CM; 991 hdr->class_version = IB_CM_CLASS_VERSION; 992 hdr->method = IB_MGMT_METHOD_SEND; 993 hdr->attr_id = attr_id; 994 hdr->tid = tid; 995} 996 997static void cm_format_req(struct cm_req_msg *req_msg, 998 struct cm_id_private *cm_id_priv, 999 struct ib_cm_req_param *param) 1000{ 1001 struct ib_sa_path_rec *pri_path = param->primary_path; 1002 struct ib_sa_path_rec *alt_path = param->alternate_path; 1003 1004 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1005 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1006 1007 req_msg->local_comm_id = cm_id_priv->id.local_id; 1008 req_msg->service_id = param->service_id; 1009 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1010 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1011 cm_req_set_resp_res(req_msg, param->responder_resources); 1012 cm_req_set_init_depth(req_msg, param->initiator_depth); 1013 cm_req_set_remote_resp_timeout(req_msg, 1014 param->remote_cm_response_timeout); 1015 cm_req_set_qp_type(req_msg, param->qp_type); 1016 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1017 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1018 cm_req_set_local_resp_timeout(req_msg, 1019 param->local_cm_response_timeout); 1020 cm_req_set_retry_count(req_msg, param->retry_count); 1021 req_msg->pkey = param->primary_path->pkey; 1022 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1023 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1024 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1025 cm_req_set_srq(req_msg, param->srq); 1026 1027 if (pri_path->hop_limit <= 1) { 1028 req_msg->primary_local_lid = pri_path->slid; 1029 req_msg->primary_remote_lid = pri_path->dlid; 1030 } else { 1031 /* Work-around until there's a way to obtain remote LID info */ 1032 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1033 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1034 } 1035 req_msg->primary_local_gid = pri_path->sgid; 1036 req_msg->primary_remote_gid = pri_path->dgid; 1037 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1038 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1039 req_msg->primary_traffic_class = pri_path->traffic_class; 1040 req_msg->primary_hop_limit = pri_path->hop_limit; 1041 cm_req_set_primary_sl(req_msg, pri_path->sl); 1042 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1043 cm_req_set_primary_local_ack_timeout(req_msg, 1044 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1045 pri_path->packet_life_time)); 1046 1047 if (alt_path) { 1048 if (alt_path->hop_limit <= 1) { 1049 req_msg->alt_local_lid = alt_path->slid; 1050 req_msg->alt_remote_lid = alt_path->dlid; 1051 } else { 1052 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1053 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1054 } 1055 req_msg->alt_local_gid = alt_path->sgid; 1056 req_msg->alt_remote_gid = alt_path->dgid; 1057 cm_req_set_alt_flow_label(req_msg, 1058 alt_path->flow_label); 1059 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1060 req_msg->alt_traffic_class = alt_path->traffic_class; 1061 req_msg->alt_hop_limit = alt_path->hop_limit; 1062 cm_req_set_alt_sl(req_msg, alt_path->sl); 1063 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1064 cm_req_set_alt_local_ack_timeout(req_msg, 1065 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1066 alt_path->packet_life_time)); 1067 } 1068 1069 if (param->private_data && param->private_data_len) 1070 memcpy(req_msg->private_data, param->private_data, 1071 param->private_data_len); 1072} 1073 1074static int cm_validate_req_param(struct ib_cm_req_param *param) 1075{ 1076 /* peer-to-peer not supported */ 1077 if (param->peer_to_peer) 1078 return -EINVAL; 1079 1080 if (!param->primary_path) 1081 return -EINVAL; 1082 1083 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 1084 return -EINVAL; 1085 1086 if (param->private_data && 1087 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1088 return -EINVAL; 1089 1090 if (param->alternate_path && 1091 (param->alternate_path->pkey != param->primary_path->pkey || 1092 param->alternate_path->mtu != param->primary_path->mtu)) 1093 return -EINVAL; 1094 1095 return 0; 1096} 1097 1098int ib_send_cm_req(struct ib_cm_id *cm_id, 1099 struct ib_cm_req_param *param) 1100{ 1101 struct cm_id_private *cm_id_priv; 1102 struct cm_req_msg *req_msg; 1103 unsigned long flags; 1104 int ret; 1105 1106 ret = cm_validate_req_param(param); 1107 if (ret) 1108 return ret; 1109 1110 /* Verify that we're not in timewait. */ 1111 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1112 spin_lock_irqsave(&cm_id_priv->lock, flags); 1113 if (cm_id->state != IB_CM_IDLE) { 1114 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1115 ret = -EINVAL; 1116 goto out; 1117 } 1118 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1119 1120 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1121 id.local_id); 1122 if (IS_ERR(cm_id_priv->timewait_info)) { 1123 ret = PTR_ERR(cm_id_priv->timewait_info); 1124 goto out; 1125 } 1126 1127 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1128 if (ret) 1129 goto error1; 1130 if (param->alternate_path) { 1131 ret = cm_init_av_by_path(param->alternate_path, 1132 &cm_id_priv->alt_av); 1133 if (ret) 1134 goto error1; 1135 } 1136 cm_id->service_id = param->service_id; 1137 cm_id->service_mask = ~cpu_to_be64(0); 1138 cm_id_priv->timeout_ms = cm_convert_to_ms( 1139 param->primary_path->packet_life_time) * 2 + 1140 cm_convert_to_ms( 1141 param->remote_cm_response_timeout); 1142 cm_id_priv->max_cm_retries = param->max_cm_retries; 1143 cm_id_priv->initiator_depth = param->initiator_depth; 1144 cm_id_priv->responder_resources = param->responder_resources; 1145 cm_id_priv->retry_count = param->retry_count; 1146 cm_id_priv->path_mtu = param->primary_path->mtu; 1147 cm_id_priv->pkey = param->primary_path->pkey; 1148 cm_id_priv->qp_type = param->qp_type; 1149 1150 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1151 if (ret) 1152 goto error1; 1153 1154 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1155 cm_format_req(req_msg, cm_id_priv, param); 1156 cm_id_priv->tid = req_msg->hdr.tid; 1157 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1158 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1159 1160 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1161 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1162 1163 spin_lock_irqsave(&cm_id_priv->lock, flags); 1164 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1165 if (ret) { 1166 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1167 goto error2; 1168 } 1169 BUG_ON(cm_id->state != IB_CM_IDLE); 1170 cm_id->state = IB_CM_REQ_SENT; 1171 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1172 return 0; 1173 1174error2: cm_free_msg(cm_id_priv->msg); 1175error1: kfree(cm_id_priv->timewait_info); 1176out: return ret; 1177} 1178EXPORT_SYMBOL(ib_send_cm_req); 1179 1180static int cm_issue_rej(struct cm_port *port, 1181 struct ib_mad_recv_wc *mad_recv_wc, 1182 enum ib_cm_rej_reason reason, 1183 enum cm_msg_response msg_rejected, 1184 void *ari, u8 ari_length) 1185{ 1186 struct ib_mad_send_buf *msg = NULL; 1187 struct cm_rej_msg *rej_msg, *rcv_msg; 1188 int ret; 1189 1190 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1191 if (ret) 1192 return ret; 1193 1194 /* We just need common CM header information. Cast to any message. */ 1195 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1196 rej_msg = (struct cm_rej_msg *) msg->mad; 1197 1198 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1199 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1200 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1201 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1202 rej_msg->reason = cpu_to_be16(reason); 1203 1204 if (ari && ari_length) { 1205 cm_rej_set_reject_info_len(rej_msg, ari_length); 1206 memcpy(rej_msg->ari, ari, ari_length); 1207 } 1208 1209 ret = ib_post_send_mad(msg, NULL); 1210 if (ret) 1211 cm_free_msg(msg); 1212 1213 return ret; 1214} 1215 1216static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1217 __be32 local_qpn, __be32 remote_qpn) 1218{ 1219 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1220 ((local_ca_guid == remote_ca_guid) && 1221 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1222} 1223 1224static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1225 struct ib_sa_path_rec *primary_path, 1226 struct ib_sa_path_rec *alt_path) 1227{ 1228 memset(primary_path, 0, sizeof *primary_path); 1229 primary_path->dgid = req_msg->primary_local_gid; 1230 primary_path->sgid = req_msg->primary_remote_gid; 1231 primary_path->dlid = req_msg->primary_local_lid; 1232 primary_path->slid = req_msg->primary_remote_lid; 1233 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1234 primary_path->hop_limit = req_msg->primary_hop_limit; 1235 primary_path->traffic_class = req_msg->primary_traffic_class; 1236 primary_path->reversible = 1; 1237 primary_path->pkey = req_msg->pkey; 1238 primary_path->sl = cm_req_get_primary_sl(req_msg); 1239 primary_path->mtu_selector = IB_SA_EQ; 1240 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1241 primary_path->rate_selector = IB_SA_EQ; 1242 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1243 primary_path->packet_life_time_selector = IB_SA_EQ; 1244 primary_path->packet_life_time = 1245 cm_req_get_primary_local_ack_timeout(req_msg); 1246 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1247 1248 if (req_msg->alt_local_lid) { 1249 memset(alt_path, 0, sizeof *alt_path); 1250 alt_path->dgid = req_msg->alt_local_gid; 1251 alt_path->sgid = req_msg->alt_remote_gid; 1252 alt_path->dlid = req_msg->alt_local_lid; 1253 alt_path->slid = req_msg->alt_remote_lid; 1254 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1255 alt_path->hop_limit = req_msg->alt_hop_limit; 1256 alt_path->traffic_class = req_msg->alt_traffic_class; 1257 alt_path->reversible = 1; 1258 alt_path->pkey = req_msg->pkey; 1259 alt_path->sl = cm_req_get_alt_sl(req_msg); 1260 alt_path->mtu_selector = IB_SA_EQ; 1261 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1262 alt_path->rate_selector = IB_SA_EQ; 1263 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1264 alt_path->packet_life_time_selector = IB_SA_EQ; 1265 alt_path->packet_life_time = 1266 cm_req_get_alt_local_ack_timeout(req_msg); 1267 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1268 } 1269} 1270 1271static void cm_format_req_event(struct cm_work *work, 1272 struct cm_id_private *cm_id_priv, 1273 struct ib_cm_id *listen_id) 1274{ 1275 struct cm_req_msg *req_msg; 1276 struct ib_cm_req_event_param *param; 1277 1278 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1279 param = &work->cm_event.param.req_rcvd; 1280 param->listen_id = listen_id; 1281 param->port = cm_id_priv->av.port->port_num; 1282 param->primary_path = &work->path[0]; 1283 if (req_msg->alt_local_lid) 1284 param->alternate_path = &work->path[1]; 1285 else 1286 param->alternate_path = NULL; 1287 param->remote_ca_guid = req_msg->local_ca_guid; 1288 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1289 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1290 param->qp_type = cm_req_get_qp_type(req_msg); 1291 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1292 param->responder_resources = cm_req_get_init_depth(req_msg); 1293 param->initiator_depth = cm_req_get_resp_res(req_msg); 1294 param->local_cm_response_timeout = 1295 cm_req_get_remote_resp_timeout(req_msg); 1296 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1297 param->remote_cm_response_timeout = 1298 cm_req_get_local_resp_timeout(req_msg); 1299 param->retry_count = cm_req_get_retry_count(req_msg); 1300 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1301 param->srq = cm_req_get_srq(req_msg); 1302 work->cm_event.private_data = &req_msg->private_data; 1303} 1304 1305static void cm_process_work(struct cm_id_private *cm_id_priv, 1306 struct cm_work *work) 1307{ 1308 int ret; 1309 1310 /* We will typically only have the current event to report. */ 1311 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1312 cm_free_work(work); 1313 1314 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1315 spin_lock_irq(&cm_id_priv->lock); 1316 work = cm_dequeue_work(cm_id_priv); 1317 spin_unlock_irq(&cm_id_priv->lock); 1318 BUG_ON(!work); 1319 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1320 &work->cm_event); 1321 cm_free_work(work); 1322 } 1323 cm_deref_id(cm_id_priv); 1324 if (ret) 1325 cm_destroy_id(&cm_id_priv->id, ret); 1326} 1327 1328static void cm_format_mra(struct cm_mra_msg *mra_msg, 1329 struct cm_id_private *cm_id_priv, 1330 enum cm_msg_response msg_mraed, u8 service_timeout, 1331 const void *private_data, u8 private_data_len) 1332{ 1333 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1334 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1335 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1336 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1337 cm_mra_set_service_timeout(mra_msg, service_timeout); 1338 1339 if (private_data && private_data_len) 1340 memcpy(mra_msg->private_data, private_data, private_data_len); 1341} 1342 1343static void cm_format_rej(struct cm_rej_msg *rej_msg, 1344 struct cm_id_private *cm_id_priv, 1345 enum ib_cm_rej_reason reason, 1346 void *ari, 1347 u8 ari_length, 1348 const void *private_data, 1349 u8 private_data_len) 1350{ 1351 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1352 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1353 1354 switch(cm_id_priv->id.state) { 1355 case IB_CM_REQ_RCVD: 1356 rej_msg->local_comm_id = 0; 1357 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1358 break; 1359 case IB_CM_MRA_REQ_SENT: 1360 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1361 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1362 break; 1363 case IB_CM_REP_RCVD: 1364 case IB_CM_MRA_REP_SENT: 1365 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1366 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1367 break; 1368 default: 1369 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1370 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1371 break; 1372 } 1373 1374 rej_msg->reason = cpu_to_be16(reason); 1375 if (ari && ari_length) { 1376 cm_rej_set_reject_info_len(rej_msg, ari_length); 1377 memcpy(rej_msg->ari, ari, ari_length); 1378 } 1379 1380 if (private_data && private_data_len) 1381 memcpy(rej_msg->private_data, private_data, private_data_len); 1382} 1383 1384static void cm_dup_req_handler(struct cm_work *work, 1385 struct cm_id_private *cm_id_priv) 1386{ 1387 struct ib_mad_send_buf *msg = NULL; 1388 int ret; 1389 1390 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1391 counter[CM_REQ_COUNTER]); 1392 1393 /* Quick state check to discard duplicate REQs. */ 1394 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1395 return; 1396 1397 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1398 if (ret) 1399 return; 1400 1401 spin_lock_irq(&cm_id_priv->lock); 1402 switch (cm_id_priv->id.state) { 1403 case IB_CM_MRA_REQ_SENT: 1404 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1405 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1406 cm_id_priv->private_data, 1407 cm_id_priv->private_data_len); 1408 break; 1409 case IB_CM_TIMEWAIT: 1410 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1411 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1412 break; 1413 default: 1414 goto unlock; 1415 } 1416 spin_unlock_irq(&cm_id_priv->lock); 1417 1418 ret = ib_post_send_mad(msg, NULL); 1419 if (ret) 1420 goto free; 1421 return; 1422 1423unlock: spin_unlock_irq(&cm_id_priv->lock); 1424free: cm_free_msg(msg); 1425} 1426 1427static struct cm_id_private * cm_match_req(struct cm_work *work, 1428 struct cm_id_private *cm_id_priv) 1429{ 1430 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1431 struct cm_timewait_info *timewait_info; 1432 struct cm_req_msg *req_msg; 1433 1434 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1435 1436 /* Check for possible duplicate REQ. */ 1437 spin_lock_irq(&cm.lock); 1438 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1439 if (timewait_info) { 1440 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1441 timewait_info->work.remote_id); 1442 spin_unlock_irq(&cm.lock); 1443 if (cur_cm_id_priv) { 1444 cm_dup_req_handler(work, cur_cm_id_priv); 1445 cm_deref_id(cur_cm_id_priv); 1446 } 1447 return NULL; 1448 } 1449 1450 /* Check for stale connections. */ 1451 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1452 if (timewait_info) { 1453 cm_cleanup_timewait(cm_id_priv->timewait_info); 1454 spin_unlock_irq(&cm.lock); 1455 cm_issue_rej(work->port, work->mad_recv_wc, 1456 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1457 NULL, 0); 1458 return NULL; 1459 } 1460 1461 /* Find matching listen request. */ 1462 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1463 req_msg->service_id, 1464 req_msg->private_data); 1465 if (!listen_cm_id_priv) { 1466 cm_cleanup_timewait(cm_id_priv->timewait_info); 1467 spin_unlock_irq(&cm.lock); 1468 cm_issue_rej(work->port, work->mad_recv_wc, 1469 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1470 NULL, 0); 1471 goto out; 1472 } 1473 atomic_inc(&listen_cm_id_priv->refcount); 1474 atomic_inc(&cm_id_priv->refcount); 1475 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1476 atomic_inc(&cm_id_priv->work_count); 1477 spin_unlock_irq(&cm.lock); 1478out: 1479 return listen_cm_id_priv; 1480} 1481 1482/* 1483 * Work-around for inter-subnet connections. If the LIDs are permissive, 1484 * we need to override the LID/SL data in the REQ with the LID information 1485 * in the work completion. 1486 */ 1487static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1488{ 1489 if (!cm_req_get_primary_subnet_local(req_msg)) { 1490 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1491 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1492 cm_req_set_primary_sl(req_msg, wc->sl); 1493 } 1494 1495 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1496 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1497 } 1498 1499 if (!cm_req_get_alt_subnet_local(req_msg)) { 1500 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1501 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1502 cm_req_set_alt_sl(req_msg, wc->sl); 1503 } 1504 1505 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1506 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1507 } 1508} 1509 1510static int cm_req_handler(struct cm_work *work) 1511{ 1512 struct ib_cm_id *cm_id; 1513 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1514 struct cm_req_msg *req_msg; 1515 int ret; 1516 1517 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1518 1519 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1520 if (IS_ERR(cm_id)) 1521 return PTR_ERR(cm_id); 1522 1523 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1524 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1525 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1526 work->mad_recv_wc->recv_buf.grh, 1527 &cm_id_priv->av); 1528 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1529 id.local_id); 1530 if (IS_ERR(cm_id_priv->timewait_info)) { 1531 ret = PTR_ERR(cm_id_priv->timewait_info); 1532 goto destroy; 1533 } 1534 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1535 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1536 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1537 1538 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1539 if (!listen_cm_id_priv) { 1540 ret = -EINVAL; 1541 kfree(cm_id_priv->timewait_info); 1542 goto destroy; 1543 } 1544 1545 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1546 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1547 cm_id_priv->id.service_id = req_msg->service_id; 1548 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1549 1550 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1551 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1552 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1553 if (ret) { 1554 ib_get_cached_gid(work->port->cm_dev->ib_device, 1555 work->port->port_num, 0, &work->path[0].sgid); 1556 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1557 &work->path[0].sgid, sizeof work->path[0].sgid, 1558 NULL, 0); 1559 goto rejected; 1560 } 1561 if (req_msg->alt_local_lid) { 1562 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1563 if (ret) { 1564 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1565 &work->path[0].sgid, 1566 sizeof work->path[0].sgid, NULL, 0); 1567 goto rejected; 1568 } 1569 } 1570 cm_id_priv->tid = req_msg->hdr.tid; 1571 cm_id_priv->timeout_ms = cm_convert_to_ms( 1572 cm_req_get_local_resp_timeout(req_msg)); 1573 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1574 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1575 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1576 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1577 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1578 cm_id_priv->pkey = req_msg->pkey; 1579 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1580 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1581 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1582 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1583 1584 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1585 cm_process_work(cm_id_priv, work); 1586 cm_deref_id(listen_cm_id_priv); 1587 return 0; 1588 1589rejected: 1590 atomic_dec(&cm_id_priv->refcount); 1591 cm_deref_id(listen_cm_id_priv); 1592destroy: 1593 ib_destroy_cm_id(cm_id); 1594 return ret; 1595} 1596 1597static void cm_format_rep(struct cm_rep_msg *rep_msg, 1598 struct cm_id_private *cm_id_priv, 1599 struct ib_cm_rep_param *param) 1600{ 1601 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1602 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1603 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1604 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1605 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1606 rep_msg->resp_resources = param->responder_resources; 1607 rep_msg->initiator_depth = param->initiator_depth; 1608 cm_rep_set_target_ack_delay(rep_msg, 1609 cm_id_priv->av.port->cm_dev->ack_delay); 1610 cm_rep_set_failover(rep_msg, param->failover_accepted); 1611 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1612 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1613 cm_rep_set_srq(rep_msg, param->srq); 1614 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1615 1616 if (param->private_data && param->private_data_len) 1617 memcpy(rep_msg->private_data, param->private_data, 1618 param->private_data_len); 1619} 1620 1621int ib_send_cm_rep(struct ib_cm_id *cm_id, 1622 struct ib_cm_rep_param *param) 1623{ 1624 struct cm_id_private *cm_id_priv; 1625 struct ib_mad_send_buf *msg; 1626 struct cm_rep_msg *rep_msg; 1627 unsigned long flags; 1628 int ret; 1629 1630 if (param->private_data && 1631 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1632 return -EINVAL; 1633 1634 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1635 spin_lock_irqsave(&cm_id_priv->lock, flags); 1636 if (cm_id->state != IB_CM_REQ_RCVD && 1637 cm_id->state != IB_CM_MRA_REQ_SENT) { 1638 ret = -EINVAL; 1639 goto out; 1640 } 1641 1642 ret = cm_alloc_msg(cm_id_priv, &msg); 1643 if (ret) 1644 goto out; 1645 1646 rep_msg = (struct cm_rep_msg *) msg->mad; 1647 cm_format_rep(rep_msg, cm_id_priv, param); 1648 msg->timeout_ms = cm_id_priv->timeout_ms; 1649 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1650 1651 ret = ib_post_send_mad(msg, NULL); 1652 if (ret) { 1653 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1654 cm_free_msg(msg); 1655 return ret; 1656 } 1657 1658 cm_id->state = IB_CM_REP_SENT; 1659 cm_id_priv->msg = msg; 1660 cm_id_priv->initiator_depth = param->initiator_depth; 1661 cm_id_priv->responder_resources = param->responder_resources; 1662 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1663 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1664 1665out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1666 return ret; 1667} 1668EXPORT_SYMBOL(ib_send_cm_rep); 1669 1670static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1671 struct cm_id_private *cm_id_priv, 1672 const void *private_data, 1673 u8 private_data_len) 1674{ 1675 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1676 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1677 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1678 1679 if (private_data && private_data_len) 1680 memcpy(rtu_msg->private_data, private_data, private_data_len); 1681} 1682 1683int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1684 const void *private_data, 1685 u8 private_data_len) 1686{ 1687 struct cm_id_private *cm_id_priv; 1688 struct ib_mad_send_buf *msg; 1689 unsigned long flags; 1690 void *data; 1691 int ret; 1692 1693 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1694 return -EINVAL; 1695 1696 data = cm_copy_private_data(private_data, private_data_len); 1697 if (IS_ERR(data)) 1698 return PTR_ERR(data); 1699 1700 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1701 spin_lock_irqsave(&cm_id_priv->lock, flags); 1702 if (cm_id->state != IB_CM_REP_RCVD && 1703 cm_id->state != IB_CM_MRA_REP_SENT) { 1704 ret = -EINVAL; 1705 goto error; 1706 } 1707 1708 ret = cm_alloc_msg(cm_id_priv, &msg); 1709 if (ret) 1710 goto error; 1711 1712 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1713 private_data, private_data_len); 1714 1715 ret = ib_post_send_mad(msg, NULL); 1716 if (ret) { 1717 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1718 cm_free_msg(msg); 1719 kfree(data); 1720 return ret; 1721 } 1722 1723 cm_id->state = IB_CM_ESTABLISHED; 1724 cm_set_private_data(cm_id_priv, data, private_data_len); 1725 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1726 return 0; 1727 1728error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1729 kfree(data); 1730 return ret; 1731} 1732EXPORT_SYMBOL(ib_send_cm_rtu); 1733 1734static void cm_format_rep_event(struct cm_work *work) 1735{ 1736 struct cm_rep_msg *rep_msg; 1737 struct ib_cm_rep_event_param *param; 1738 1739 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1740 param = &work->cm_event.param.rep_rcvd; 1741 param->remote_ca_guid = rep_msg->local_ca_guid; 1742 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1743 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1744 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1745 param->responder_resources = rep_msg->initiator_depth; 1746 param->initiator_depth = rep_msg->resp_resources; 1747 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1748 param->failover_accepted = cm_rep_get_failover(rep_msg); 1749 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1750 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1751 param->srq = cm_rep_get_srq(rep_msg); 1752 work->cm_event.private_data = &rep_msg->private_data; 1753} 1754 1755static void cm_dup_rep_handler(struct cm_work *work) 1756{ 1757 struct cm_id_private *cm_id_priv; 1758 struct cm_rep_msg *rep_msg; 1759 struct ib_mad_send_buf *msg = NULL; 1760 int ret; 1761 1762 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1763 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1764 rep_msg->local_comm_id); 1765 if (!cm_id_priv) 1766 return; 1767 1768 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1769 counter[CM_REP_COUNTER]); 1770 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1771 if (ret) 1772 goto deref; 1773 1774 spin_lock_irq(&cm_id_priv->lock); 1775 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1776 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1777 cm_id_priv->private_data, 1778 cm_id_priv->private_data_len); 1779 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1780 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1781 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1782 cm_id_priv->private_data, 1783 cm_id_priv->private_data_len); 1784 else 1785 goto unlock; 1786 spin_unlock_irq(&cm_id_priv->lock); 1787 1788 ret = ib_post_send_mad(msg, NULL); 1789 if (ret) 1790 goto free; 1791 goto deref; 1792 1793unlock: spin_unlock_irq(&cm_id_priv->lock); 1794free: cm_free_msg(msg); 1795deref: cm_deref_id(cm_id_priv); 1796} 1797 1798static int cm_rep_handler(struct cm_work *work) 1799{ 1800 struct cm_id_private *cm_id_priv; 1801 struct cm_rep_msg *rep_msg; 1802 int ret; 1803 1804 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1805 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1806 if (!cm_id_priv) { 1807 cm_dup_rep_handler(work); 1808 return -EINVAL; 1809 } 1810 1811 cm_format_rep_event(work); 1812 1813 spin_lock_irq(&cm_id_priv->lock); 1814 switch (cm_id_priv->id.state) { 1815 case IB_CM_REQ_SENT: 1816 case IB_CM_MRA_REQ_RCVD: 1817 break; 1818 default: 1819 spin_unlock_irq(&cm_id_priv->lock); 1820 ret = -EINVAL; 1821 goto error; 1822 } 1823 1824 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1825 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1826 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1827 1828 spin_lock(&cm.lock); 1829 /* Check for duplicate REP. */ 1830 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1831 spin_unlock(&cm.lock); 1832 spin_unlock_irq(&cm_id_priv->lock); 1833 ret = -EINVAL; 1834 goto error; 1835 } 1836 /* Check for a stale connection. */ 1837 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1838 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1839 &cm.remote_id_table); 1840 cm_id_priv->timewait_info->inserted_remote_id = 0; 1841 spin_unlock(&cm.lock); 1842 spin_unlock_irq(&cm_id_priv->lock); 1843 cm_issue_rej(work->port, work->mad_recv_wc, 1844 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1845 NULL, 0); 1846 ret = -EINVAL; 1847 goto error; 1848 } 1849 spin_unlock(&cm.lock); 1850 1851 cm_id_priv->id.state = IB_CM_REP_RCVD; 1852 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1853 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1854 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1855 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1856 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1857 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1858 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1859 cm_id_priv->av.timeout = 1860 cm_ack_timeout(cm_id_priv->target_ack_delay, 1861 cm_id_priv->av.timeout - 1); 1862 cm_id_priv->alt_av.timeout = 1863 cm_ack_timeout(cm_id_priv->target_ack_delay, 1864 cm_id_priv->alt_av.timeout - 1); 1865 1866 /* todo: handle peer_to_peer */ 1867 1868 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1869 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1870 if (!ret) 1871 list_add_tail(&work->list, &cm_id_priv->work_list); 1872 spin_unlock_irq(&cm_id_priv->lock); 1873 1874 if (ret) 1875 cm_process_work(cm_id_priv, work); 1876 else 1877 cm_deref_id(cm_id_priv); 1878 return 0; 1879 1880error: 1881 cm_deref_id(cm_id_priv); 1882 return ret; 1883} 1884 1885static int cm_establish_handler(struct cm_work *work) 1886{ 1887 struct cm_id_private *cm_id_priv; 1888 int ret; 1889 1890 /* See comment in cm_establish about lookup. */ 1891 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1892 if (!cm_id_priv) 1893 return -EINVAL; 1894 1895 spin_lock_irq(&cm_id_priv->lock); 1896 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1897 spin_unlock_irq(&cm_id_priv->lock); 1898 goto out; 1899 } 1900 1901 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1902 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1903 if (!ret) 1904 list_add_tail(&work->list, &cm_id_priv->work_list); 1905 spin_unlock_irq(&cm_id_priv->lock); 1906 1907 if (ret) 1908 cm_process_work(cm_id_priv, work); 1909 else 1910 cm_deref_id(cm_id_priv); 1911 return 0; 1912out: 1913 cm_deref_id(cm_id_priv); 1914 return -EINVAL; 1915} 1916 1917static int cm_rtu_handler(struct cm_work *work) 1918{ 1919 struct cm_id_private *cm_id_priv; 1920 struct cm_rtu_msg *rtu_msg; 1921 int ret; 1922 1923 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1924 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1925 rtu_msg->local_comm_id); 1926 if (!cm_id_priv) 1927 return -EINVAL; 1928 1929 work->cm_event.private_data = &rtu_msg->private_data; 1930 1931 spin_lock_irq(&cm_id_priv->lock); 1932 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1933 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1934 spin_unlock_irq(&cm_id_priv->lock); 1935 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1936 counter[CM_RTU_COUNTER]); 1937 goto out; 1938 } 1939 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1940 1941 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1942 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1943 if (!ret) 1944 list_add_tail(&work->list, &cm_id_priv->work_list); 1945 spin_unlock_irq(&cm_id_priv->lock); 1946 1947 if (ret) 1948 cm_process_work(cm_id_priv, work); 1949 else 1950 cm_deref_id(cm_id_priv); 1951 return 0; 1952out: 1953 cm_deref_id(cm_id_priv); 1954 return -EINVAL; 1955} 1956 1957static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1958 struct cm_id_private *cm_id_priv, 1959 const void *private_data, 1960 u8 private_data_len) 1961{ 1962 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1963 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1964 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1965 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1966 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1967 1968 if (private_data && private_data_len) 1969 memcpy(dreq_msg->private_data, private_data, private_data_len); 1970} 1971 1972int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1973 const void *private_data, 1974 u8 private_data_len) 1975{ 1976 struct cm_id_private *cm_id_priv; 1977 struct ib_mad_send_buf *msg; 1978 unsigned long flags; 1979 int ret; 1980 1981 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1982 return -EINVAL; 1983 1984 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1985 spin_lock_irqsave(&cm_id_priv->lock, flags); 1986 if (cm_id->state != IB_CM_ESTABLISHED) { 1987 ret = -EINVAL; 1988 goto out; 1989 } 1990 1991 if (cm_id->lap_state == IB_CM_LAP_SENT || 1992 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 1993 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1994 1995 ret = cm_alloc_msg(cm_id_priv, &msg); 1996 if (ret) { 1997 cm_enter_timewait(cm_id_priv); 1998 goto out; 1999 } 2000 2001 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2002 private_data, private_data_len); 2003 msg->timeout_ms = cm_id_priv->timeout_ms; 2004 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2005 2006 ret = ib_post_send_mad(msg, NULL); 2007 if (ret) { 2008 cm_enter_timewait(cm_id_priv); 2009 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2010 cm_free_msg(msg); 2011 return ret; 2012 } 2013 2014 cm_id->state = IB_CM_DREQ_SENT; 2015 cm_id_priv->msg = msg; 2016out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2017 return ret; 2018} 2019EXPORT_SYMBOL(ib_send_cm_dreq); 2020 2021static void cm_format_drep(struct cm_drep_msg *drep_msg, 2022 struct cm_id_private *cm_id_priv, 2023 const void *private_data, 2024 u8 private_data_len) 2025{ 2026 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2027 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2028 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2029 2030 if (private_data && private_data_len) 2031 memcpy(drep_msg->private_data, private_data, private_data_len); 2032} 2033 2034int ib_send_cm_drep(struct ib_cm_id *cm_id, 2035 const void *private_data, 2036 u8 private_data_len) 2037{ 2038 struct cm_id_private *cm_id_priv; 2039 struct ib_mad_send_buf *msg; 2040 unsigned long flags; 2041 void *data; 2042 int ret; 2043 2044 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2045 return -EINVAL; 2046 2047 data = cm_copy_private_data(private_data, private_data_len); 2048 if (IS_ERR(data)) 2049 return PTR_ERR(data); 2050 2051 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2052 spin_lock_irqsave(&cm_id_priv->lock, flags); 2053 if (cm_id->state != IB_CM_DREQ_RCVD) { 2054 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2055 kfree(data); 2056 return -EINVAL; 2057 } 2058 2059 cm_set_private_data(cm_id_priv, data, private_data_len); 2060 cm_enter_timewait(cm_id_priv); 2061 2062 ret = cm_alloc_msg(cm_id_priv, &msg); 2063 if (ret) 2064 goto out; 2065 2066 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2067 private_data, private_data_len); 2068 2069 ret = ib_post_send_mad(msg, NULL); 2070 if (ret) { 2071 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2072 cm_free_msg(msg); 2073 return ret; 2074 } 2075 2076out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2077 return ret; 2078} 2079EXPORT_SYMBOL(ib_send_cm_drep); 2080 2081static int cm_issue_drep(struct cm_port *port, 2082 struct ib_mad_recv_wc *mad_recv_wc) 2083{ 2084 struct ib_mad_send_buf *msg = NULL; 2085 struct cm_dreq_msg *dreq_msg; 2086 struct cm_drep_msg *drep_msg; 2087 int ret; 2088 2089 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2090 if (ret) 2091 return ret; 2092 2093 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2094 drep_msg = (struct cm_drep_msg *) msg->mad; 2095 2096 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2097 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2098 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2099 2100 ret = ib_post_send_mad(msg, NULL); 2101 if (ret) 2102 cm_free_msg(msg); 2103 2104 return ret; 2105} 2106 2107static int cm_dreq_handler(struct cm_work *work) 2108{ 2109 struct cm_id_private *cm_id_priv; 2110 struct cm_dreq_msg *dreq_msg; 2111 struct ib_mad_send_buf *msg = NULL; 2112 int ret; 2113 2114 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2115 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2116 dreq_msg->local_comm_id); 2117 if (!cm_id_priv) { 2118 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2119 counter[CM_DREQ_COUNTER]); 2120 cm_issue_drep(work->port, work->mad_recv_wc); 2121 return -EINVAL; 2122 } 2123 2124 work->cm_event.private_data = &dreq_msg->private_data; 2125 2126 spin_lock_irq(&cm_id_priv->lock); 2127 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2128 goto unlock; 2129 2130 switch (cm_id_priv->id.state) { 2131 case IB_CM_REP_SENT: 2132 case IB_CM_DREQ_SENT: 2133 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2134 break; 2135 case IB_CM_ESTABLISHED: 2136 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2137 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2138 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2139 break; 2140 case IB_CM_MRA_REP_RCVD: 2141 break; 2142 case IB_CM_TIMEWAIT: 2143 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2144 counter[CM_DREQ_COUNTER]); 2145 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2146 goto unlock; 2147 2148 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2149 cm_id_priv->private_data, 2150 cm_id_priv->private_data_len); 2151 spin_unlock_irq(&cm_id_priv->lock); 2152 2153 if (ib_post_send_mad(msg, NULL)) 2154 cm_free_msg(msg); 2155 goto deref; 2156 case IB_CM_DREQ_RCVD: 2157 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2158 counter[CM_DREQ_COUNTER]); 2159 goto unlock; 2160 default: 2161 goto unlock; 2162 } 2163 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2164 cm_id_priv->tid = dreq_msg->hdr.tid; 2165 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2166 if (!ret) 2167 list_add_tail(&work->list, &cm_id_priv->work_list); 2168 spin_unlock_irq(&cm_id_priv->lock); 2169 2170 if (ret) 2171 cm_process_work(cm_id_priv, work); 2172 else 2173 cm_deref_id(cm_id_priv); 2174 return 0; 2175 2176unlock: spin_unlock_irq(&cm_id_priv->lock); 2177deref: cm_deref_id(cm_id_priv); 2178 return -EINVAL; 2179} 2180 2181static int cm_drep_handler(struct cm_work *work) 2182{ 2183 struct cm_id_private *cm_id_priv; 2184 struct cm_drep_msg *drep_msg; 2185 int ret; 2186 2187 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2188 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2189 drep_msg->local_comm_id); 2190 if (!cm_id_priv) 2191 return -EINVAL; 2192 2193 work->cm_event.private_data = &drep_msg->private_data; 2194 2195 spin_lock_irq(&cm_id_priv->lock); 2196 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2197 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2198 spin_unlock_irq(&cm_id_priv->lock); 2199 goto out; 2200 } 2201 cm_enter_timewait(cm_id_priv); 2202 2203 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2204 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2205 if (!ret) 2206 list_add_tail(&work->list, &cm_id_priv->work_list); 2207 spin_unlock_irq(&cm_id_priv->lock); 2208 2209 if (ret) 2210 cm_process_work(cm_id_priv, work); 2211 else 2212 cm_deref_id(cm_id_priv); 2213 return 0; 2214out: 2215 cm_deref_id(cm_id_priv); 2216 return -EINVAL; 2217} 2218 2219int ib_send_cm_rej(struct ib_cm_id *cm_id, 2220 enum ib_cm_rej_reason reason, 2221 void *ari, 2222 u8 ari_length, 2223 const void *private_data, 2224 u8 private_data_len) 2225{ 2226 struct cm_id_private *cm_id_priv; 2227 struct ib_mad_send_buf *msg; 2228 unsigned long flags; 2229 int ret; 2230 2231 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2232 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2233 return -EINVAL; 2234 2235 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2236 2237 spin_lock_irqsave(&cm_id_priv->lock, flags); 2238 switch (cm_id->state) { 2239 case IB_CM_REQ_SENT: 2240 case IB_CM_MRA_REQ_RCVD: 2241 case IB_CM_REQ_RCVD: 2242 case IB_CM_MRA_REQ_SENT: 2243 case IB_CM_REP_RCVD: 2244 case IB_CM_MRA_REP_SENT: 2245 ret = cm_alloc_msg(cm_id_priv, &msg); 2246 if (!ret) 2247 cm_format_rej((struct cm_rej_msg *) msg->mad, 2248 cm_id_priv, reason, ari, ari_length, 2249 private_data, private_data_len); 2250 2251 cm_reset_to_idle(cm_id_priv); 2252 break; 2253 case IB_CM_REP_SENT: 2254 case IB_CM_MRA_REP_RCVD: 2255 ret = cm_alloc_msg(cm_id_priv, &msg); 2256 if (!ret) 2257 cm_format_rej((struct cm_rej_msg *) msg->mad, 2258 cm_id_priv, reason, ari, ari_length, 2259 private_data, private_data_len); 2260 2261 cm_enter_timewait(cm_id_priv); 2262 break; 2263 default: 2264 ret = -EINVAL; 2265 goto out; 2266 } 2267 2268 if (ret) 2269 goto out; 2270 2271 ret = ib_post_send_mad(msg, NULL); 2272 if (ret) 2273 cm_free_msg(msg); 2274 2275out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2276 return ret; 2277} 2278EXPORT_SYMBOL(ib_send_cm_rej); 2279 2280static void cm_format_rej_event(struct cm_work *work) 2281{ 2282 struct cm_rej_msg *rej_msg; 2283 struct ib_cm_rej_event_param *param; 2284 2285 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2286 param = &work->cm_event.param.rej_rcvd; 2287 param->ari = rej_msg->ari; 2288 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2289 param->reason = __be16_to_cpu(rej_msg->reason); 2290 work->cm_event.private_data = &rej_msg->private_data; 2291} 2292 2293static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2294{ 2295 struct cm_timewait_info *timewait_info; 2296 struct cm_id_private *cm_id_priv; 2297 __be32 remote_id; 2298 2299 remote_id = rej_msg->local_comm_id; 2300 2301 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2302 spin_lock_irq(&cm.lock); 2303 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2304 remote_id); 2305 if (!timewait_info) { 2306 spin_unlock_irq(&cm.lock); 2307 return NULL; 2308 } 2309 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2310 (timewait_info->work.local_id ^ 2311 cm.random_id_operand)); 2312 if (cm_id_priv) { 2313 if (cm_id_priv->id.remote_id == remote_id) 2314 atomic_inc(&cm_id_priv->refcount); 2315 else 2316 cm_id_priv = NULL; 2317 } 2318 spin_unlock_irq(&cm.lock); 2319 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2320 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2321 else 2322 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2323 2324 return cm_id_priv; 2325} 2326 2327static int cm_rej_handler(struct cm_work *work) 2328{ 2329 struct cm_id_private *cm_id_priv; 2330 struct cm_rej_msg *rej_msg; 2331 int ret; 2332 2333 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2334 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2335 if (!cm_id_priv) 2336 return -EINVAL; 2337 2338 cm_format_rej_event(work); 2339 2340 spin_lock_irq(&cm_id_priv->lock); 2341 switch (cm_id_priv->id.state) { 2342 case IB_CM_REQ_SENT: 2343 case IB_CM_MRA_REQ_RCVD: 2344 case IB_CM_REP_SENT: 2345 case IB_CM_MRA_REP_RCVD: 2346 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2347 /* fall through */ 2348 case IB_CM_REQ_RCVD: 2349 case IB_CM_MRA_REQ_SENT: 2350 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2351 cm_enter_timewait(cm_id_priv); 2352 else 2353 cm_reset_to_idle(cm_id_priv); 2354 break; 2355 case IB_CM_DREQ_SENT: 2356 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2357 /* fall through */ 2358 case IB_CM_REP_RCVD: 2359 case IB_CM_MRA_REP_SENT: 2360 cm_enter_timewait(cm_id_priv); 2361 break; 2362 case IB_CM_ESTABLISHED: 2363 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2364 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2365 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2366 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2367 cm_id_priv->msg); 2368 cm_enter_timewait(cm_id_priv); 2369 break; 2370 } 2371 /* fall through */ 2372 default: 2373 spin_unlock_irq(&cm_id_priv->lock); 2374 ret = -EINVAL; 2375 goto out; 2376 } 2377 2378 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2379 if (!ret) 2380 list_add_tail(&work->list, &cm_id_priv->work_list); 2381 spin_unlock_irq(&cm_id_priv->lock); 2382 2383 if (ret) 2384 cm_process_work(cm_id_priv, work); 2385 else 2386 cm_deref_id(cm_id_priv); 2387 return 0; 2388out: 2389 cm_deref_id(cm_id_priv); 2390 return -EINVAL; 2391} 2392 2393int ib_send_cm_mra(struct ib_cm_id *cm_id, 2394 u8 service_timeout, 2395 const void *private_data, 2396 u8 private_data_len) 2397{ 2398 struct cm_id_private *cm_id_priv; 2399 struct ib_mad_send_buf *msg; 2400 enum ib_cm_state cm_state; 2401 enum ib_cm_lap_state lap_state; 2402 enum cm_msg_response msg_response; 2403 void *data; 2404 unsigned long flags; 2405 int ret; 2406 2407 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2408 return -EINVAL; 2409 2410 data = cm_copy_private_data(private_data, private_data_len); 2411 if (IS_ERR(data)) 2412 return PTR_ERR(data); 2413 2414 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2415 2416 spin_lock_irqsave(&cm_id_priv->lock, flags); 2417 switch(cm_id_priv->id.state) { 2418 case IB_CM_REQ_RCVD: 2419 cm_state = IB_CM_MRA_REQ_SENT; 2420 lap_state = cm_id->lap_state; 2421 msg_response = CM_MSG_RESPONSE_REQ; 2422 break; 2423 case IB_CM_REP_RCVD: 2424 cm_state = IB_CM_MRA_REP_SENT; 2425 lap_state = cm_id->lap_state; 2426 msg_response = CM_MSG_RESPONSE_REP; 2427 break; 2428 case IB_CM_ESTABLISHED: 2429 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2430 cm_state = cm_id->state; 2431 lap_state = IB_CM_MRA_LAP_SENT; 2432 msg_response = CM_MSG_RESPONSE_OTHER; 2433 break; 2434 } 2435 default: 2436 ret = -EINVAL; 2437 goto error1; 2438 } 2439 2440 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2441 ret = cm_alloc_msg(cm_id_priv, &msg); 2442 if (ret) 2443 goto error1; 2444 2445 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2446 msg_response, service_timeout, 2447 private_data, private_data_len); 2448 ret = ib_post_send_mad(msg, NULL); 2449 if (ret) 2450 goto error2; 2451 } 2452 2453 cm_id->state = cm_state; 2454 cm_id->lap_state = lap_state; 2455 cm_id_priv->service_timeout = service_timeout; 2456 cm_set_private_data(cm_id_priv, data, private_data_len); 2457 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2458 return 0; 2459 2460error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2461 kfree(data); 2462 return ret; 2463 2464error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2465 kfree(data); 2466 cm_free_msg(msg); 2467 return ret; 2468} 2469EXPORT_SYMBOL(ib_send_cm_mra); 2470 2471static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2472{ 2473 switch (cm_mra_get_msg_mraed(mra_msg)) { 2474 case CM_MSG_RESPONSE_REQ: 2475 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2476 case CM_MSG_RESPONSE_REP: 2477 case CM_MSG_RESPONSE_OTHER: 2478 return cm_acquire_id(mra_msg->remote_comm_id, 2479 mra_msg->local_comm_id); 2480 default: 2481 return NULL; 2482 } 2483} 2484 2485static int cm_mra_handler(struct cm_work *work) 2486{ 2487 struct cm_id_private *cm_id_priv; 2488 struct cm_mra_msg *mra_msg; 2489 int timeout, ret; 2490 2491 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2492 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2493 if (!cm_id_priv) 2494 return -EINVAL; 2495 2496 work->cm_event.private_data = &mra_msg->private_data; 2497 work->cm_event.param.mra_rcvd.service_timeout = 2498 cm_mra_get_service_timeout(mra_msg); 2499 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2500 cm_convert_to_ms(cm_id_priv->av.timeout); 2501 2502 spin_lock_irq(&cm_id_priv->lock); 2503 switch (cm_id_priv->id.state) { 2504 case IB_CM_REQ_SENT: 2505 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2506 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2507 cm_id_priv->msg, timeout)) 2508 goto out; 2509 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2510 break; 2511 case IB_CM_REP_SENT: 2512 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2513 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2514 cm_id_priv->msg, timeout)) 2515 goto out; 2516 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2517 break; 2518 case IB_CM_ESTABLISHED: 2519 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2520 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2521 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2522 cm_id_priv->msg, timeout)) { 2523 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2524 atomic_long_inc(&work->port-> 2525 counter_group[CM_RECV_DUPLICATES]. 2526 counter[CM_MRA_COUNTER]); 2527 goto out; 2528 } 2529 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2530 break; 2531 case IB_CM_MRA_REQ_RCVD: 2532 case IB_CM_MRA_REP_RCVD: 2533 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2534 counter[CM_MRA_COUNTER]); 2535 /* fall through */ 2536 default: 2537 goto out; 2538 } 2539 2540 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2541 cm_id_priv->id.state; 2542 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2543 if (!ret) 2544 list_add_tail(&work->list, &cm_id_priv->work_list); 2545 spin_unlock_irq(&cm_id_priv->lock); 2546 2547 if (ret) 2548 cm_process_work(cm_id_priv, work); 2549 else 2550 cm_deref_id(cm_id_priv); 2551 return 0; 2552out: 2553 spin_unlock_irq(&cm_id_priv->lock); 2554 cm_deref_id(cm_id_priv); 2555 return -EINVAL; 2556} 2557 2558static void cm_format_lap(struct cm_lap_msg *lap_msg, 2559 struct cm_id_private *cm_id_priv, 2560 struct ib_sa_path_rec *alternate_path, 2561 const void *private_data, 2562 u8 private_data_len) 2563{ 2564 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2565 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2566 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2567 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2568 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2569 /* todo: need remote CM response timeout */ 2570 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2571 lap_msg->alt_local_lid = alternate_path->slid; 2572 lap_msg->alt_remote_lid = alternate_path->dlid; 2573 lap_msg->alt_local_gid = alternate_path->sgid; 2574 lap_msg->alt_remote_gid = alternate_path->dgid; 2575 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2576 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2577 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2578 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2579 cm_lap_set_sl(lap_msg, alternate_path->sl); 2580 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2581 cm_lap_set_local_ack_timeout(lap_msg, 2582 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2583 alternate_path->packet_life_time)); 2584 2585 if (private_data && private_data_len) 2586 memcpy(lap_msg->private_data, private_data, private_data_len); 2587} 2588 2589int ib_send_cm_lap(struct ib_cm_id *cm_id, 2590 struct ib_sa_path_rec *alternate_path, 2591 const void *private_data, 2592 u8 private_data_len) 2593{ 2594 struct cm_id_private *cm_id_priv; 2595 struct ib_mad_send_buf *msg; 2596 unsigned long flags; 2597 int ret; 2598 2599 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2600 return -EINVAL; 2601 2602 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2603 spin_lock_irqsave(&cm_id_priv->lock, flags); 2604 if (cm_id->state != IB_CM_ESTABLISHED || 2605 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2606 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2607 ret = -EINVAL; 2608 goto out; 2609 } 2610 2611 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2612 if (ret) 2613 goto out; 2614 cm_id_priv->alt_av.timeout = 2615 cm_ack_timeout(cm_id_priv->target_ack_delay, 2616 cm_id_priv->alt_av.timeout - 1); 2617 2618 ret = cm_alloc_msg(cm_id_priv, &msg); 2619 if (ret) 2620 goto out; 2621 2622 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2623 alternate_path, private_data, private_data_len); 2624 msg->timeout_ms = cm_id_priv->timeout_ms; 2625 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2626 2627 ret = ib_post_send_mad(msg, NULL); 2628 if (ret) { 2629 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2630 cm_free_msg(msg); 2631 return ret; 2632 } 2633 2634 cm_id->lap_state = IB_CM_LAP_SENT; 2635 cm_id_priv->msg = msg; 2636 2637out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2638 return ret; 2639} 2640EXPORT_SYMBOL(ib_send_cm_lap); 2641 2642static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2643 struct ib_sa_path_rec *path, 2644 struct cm_lap_msg *lap_msg) 2645{ 2646 memset(path, 0, sizeof *path); 2647 path->dgid = lap_msg->alt_local_gid; 2648 path->sgid = lap_msg->alt_remote_gid; 2649 path->dlid = lap_msg->alt_local_lid; 2650 path->slid = lap_msg->alt_remote_lid; 2651 path->flow_label = cm_lap_get_flow_label(lap_msg); 2652 path->hop_limit = lap_msg->alt_hop_limit; 2653 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2654 path->reversible = 1; 2655 path->pkey = cm_id_priv->pkey; 2656 path->sl = cm_lap_get_sl(lap_msg); 2657 path->mtu_selector = IB_SA_EQ; 2658 path->mtu = cm_id_priv->path_mtu; 2659 path->rate_selector = IB_SA_EQ; 2660 path->rate = cm_lap_get_packet_rate(lap_msg); 2661 path->packet_life_time_selector = IB_SA_EQ; 2662 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2663 path->packet_life_time -= (path->packet_life_time > 0); 2664} 2665 2666static int cm_lap_handler(struct cm_work *work) 2667{ 2668 struct cm_id_private *cm_id_priv; 2669 struct cm_lap_msg *lap_msg; 2670 struct ib_cm_lap_event_param *param; 2671 struct ib_mad_send_buf *msg = NULL; 2672 int ret; 2673 2674 /* todo: verify LAP request and send reject APR if invalid. */ 2675 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2676 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2677 lap_msg->local_comm_id); 2678 if (!cm_id_priv) 2679 return -EINVAL; 2680 2681 param = &work->cm_event.param.lap_rcvd; 2682 param->alternate_path = &work->path[0]; 2683 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2684 work->cm_event.private_data = &lap_msg->private_data; 2685 2686 spin_lock_irq(&cm_id_priv->lock); 2687 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2688 goto unlock; 2689 2690 switch (cm_id_priv->id.lap_state) { 2691 case IB_CM_LAP_UNINIT: 2692 case IB_CM_LAP_IDLE: 2693 break; 2694 case IB_CM_MRA_LAP_SENT: 2695 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2696 counter[CM_LAP_COUNTER]); 2697 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2698 goto unlock; 2699 2700 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2701 CM_MSG_RESPONSE_OTHER, 2702 cm_id_priv->service_timeout, 2703 cm_id_priv->private_data, 2704 cm_id_priv->private_data_len); 2705 spin_unlock_irq(&cm_id_priv->lock); 2706 2707 if (ib_post_send_mad(msg, NULL)) 2708 cm_free_msg(msg); 2709 goto deref; 2710 case IB_CM_LAP_RCVD: 2711 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2712 counter[CM_LAP_COUNTER]); 2713 goto unlock; 2714 default: 2715 goto unlock; 2716 } 2717 2718 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2719 cm_id_priv->tid = lap_msg->hdr.tid; 2720 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2721 work->mad_recv_wc->recv_buf.grh, 2722 &cm_id_priv->av); 2723 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2724 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2725 if (!ret) 2726 list_add_tail(&work->list, &cm_id_priv->work_list); 2727 spin_unlock_irq(&cm_id_priv->lock); 2728 2729 if (ret) 2730 cm_process_work(cm_id_priv, work); 2731 else 2732 cm_deref_id(cm_id_priv); 2733 return 0; 2734 2735unlock: spin_unlock_irq(&cm_id_priv->lock); 2736deref: cm_deref_id(cm_id_priv); 2737 return -EINVAL; 2738} 2739 2740static void cm_format_apr(struct cm_apr_msg *apr_msg, 2741 struct cm_id_private *cm_id_priv, 2742 enum ib_cm_apr_status status, 2743 void *info, 2744 u8 info_length, 2745 const void *private_data, 2746 u8 private_data_len) 2747{ 2748 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2749 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2750 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2751 apr_msg->ap_status = (u8) status; 2752 2753 if (info && info_length) { 2754 apr_msg->info_length = info_length; 2755 memcpy(apr_msg->info, info, info_length); 2756 } 2757 2758 if (private_data && private_data_len) 2759 memcpy(apr_msg->private_data, private_data, private_data_len); 2760} 2761 2762int ib_send_cm_apr(struct ib_cm_id *cm_id, 2763 enum ib_cm_apr_status status, 2764 void *info, 2765 u8 info_length, 2766 const void *private_data, 2767 u8 private_data_len) 2768{ 2769 struct cm_id_private *cm_id_priv; 2770 struct ib_mad_send_buf *msg; 2771 unsigned long flags; 2772 int ret; 2773 2774 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2775 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2776 return -EINVAL; 2777 2778 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2779 spin_lock_irqsave(&cm_id_priv->lock, flags); 2780 if (cm_id->state != IB_CM_ESTABLISHED || 2781 (cm_id->lap_state != IB_CM_LAP_RCVD && 2782 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2783 ret = -EINVAL; 2784 goto out; 2785 } 2786 2787 ret = cm_alloc_msg(cm_id_priv, &msg); 2788 if (ret) 2789 goto out; 2790 2791 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2792 info, info_length, private_data, private_data_len); 2793 ret = ib_post_send_mad(msg, NULL); 2794 if (ret) { 2795 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2796 cm_free_msg(msg); 2797 return ret; 2798 } 2799 2800 cm_id->lap_state = IB_CM_LAP_IDLE; 2801out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2802 return ret; 2803} 2804EXPORT_SYMBOL(ib_send_cm_apr); 2805 2806static int cm_apr_handler(struct cm_work *work) 2807{ 2808 struct cm_id_private *cm_id_priv; 2809 struct cm_apr_msg *apr_msg; 2810 int ret; 2811 2812 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2813 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2814 apr_msg->local_comm_id); 2815 if (!cm_id_priv) 2816 return -EINVAL; /* Unmatched reply. */ 2817 2818 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2819 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2820 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2821 work->cm_event.private_data = &apr_msg->private_data; 2822 2823 spin_lock_irq(&cm_id_priv->lock); 2824 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2825 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2826 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2827 spin_unlock_irq(&cm_id_priv->lock); 2828 goto out; 2829 } 2830 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2831 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2832 cm_id_priv->msg = NULL; 2833 2834 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2835 if (!ret) 2836 list_add_tail(&work->list, &cm_id_priv->work_list); 2837 spin_unlock_irq(&cm_id_priv->lock); 2838 2839 if (ret) 2840 cm_process_work(cm_id_priv, work); 2841 else 2842 cm_deref_id(cm_id_priv); 2843 return 0; 2844out: 2845 cm_deref_id(cm_id_priv); 2846 return -EINVAL; 2847} 2848 2849static int cm_timewait_handler(struct cm_work *work) 2850{ 2851 struct cm_timewait_info *timewait_info; 2852 struct cm_id_private *cm_id_priv; 2853 int ret; 2854 2855 timewait_info = (struct cm_timewait_info *)work; 2856 spin_lock_irq(&cm.lock); 2857 list_del(&timewait_info->list); 2858 spin_unlock_irq(&cm.lock); 2859 2860 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2861 timewait_info->work.remote_id); 2862 if (!cm_id_priv) 2863 return -EINVAL; 2864 2865 spin_lock_irq(&cm_id_priv->lock); 2866 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2867 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2868 spin_unlock_irq(&cm_id_priv->lock); 2869 goto out; 2870 } 2871 cm_id_priv->id.state = IB_CM_IDLE; 2872 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2873 if (!ret) 2874 list_add_tail(&work->list, &cm_id_priv->work_list); 2875 spin_unlock_irq(&cm_id_priv->lock); 2876 2877 if (ret) 2878 cm_process_work(cm_id_priv, work); 2879 else 2880 cm_deref_id(cm_id_priv); 2881 return 0; 2882out: 2883 cm_deref_id(cm_id_priv); 2884 return -EINVAL; 2885} 2886 2887static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2888 struct cm_id_private *cm_id_priv, 2889 struct ib_cm_sidr_req_param *param) 2890{ 2891 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2892 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2893 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2894 sidr_req_msg->pkey = param->path->pkey; 2895 sidr_req_msg->service_id = param->service_id; 2896 2897 if (param->private_data && param->private_data_len) 2898 memcpy(sidr_req_msg->private_data, param->private_data, 2899 param->private_data_len); 2900} 2901 2902int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2903 struct ib_cm_sidr_req_param *param) 2904{ 2905 struct cm_id_private *cm_id_priv; 2906 struct ib_mad_send_buf *msg; 2907 unsigned long flags; 2908 int ret; 2909 2910 if (!param->path || (param->private_data && 2911 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2912 return -EINVAL; 2913 2914 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2915 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2916 if (ret) 2917 goto out; 2918 2919 cm_id->service_id = param->service_id; 2920 cm_id->service_mask = ~cpu_to_be64(0); 2921 cm_id_priv->timeout_ms = param->timeout_ms; 2922 cm_id_priv->max_cm_retries = param->max_cm_retries; 2923 ret = cm_alloc_msg(cm_id_priv, &msg); 2924 if (ret) 2925 goto out; 2926 2927 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2928 param); 2929 msg->timeout_ms = cm_id_priv->timeout_ms; 2930 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2931 2932 spin_lock_irqsave(&cm_id_priv->lock, flags); 2933 if (cm_id->state == IB_CM_IDLE) 2934 ret = ib_post_send_mad(msg, NULL); 2935 else 2936 ret = -EINVAL; 2937 2938 if (ret) { 2939 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2940 cm_free_msg(msg); 2941 goto out; 2942 } 2943 cm_id->state = IB_CM_SIDR_REQ_SENT; 2944 cm_id_priv->msg = msg; 2945 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2946out: 2947 return ret; 2948} 2949EXPORT_SYMBOL(ib_send_cm_sidr_req); 2950 2951static void cm_format_sidr_req_event(struct cm_work *work, 2952 struct ib_cm_id *listen_id) 2953{ 2954 struct cm_sidr_req_msg *sidr_req_msg; 2955 struct ib_cm_sidr_req_event_param *param; 2956 2957 sidr_req_msg = (struct cm_sidr_req_msg *) 2958 work->mad_recv_wc->recv_buf.mad; 2959 param = &work->cm_event.param.sidr_req_rcvd; 2960 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2961 param->listen_id = listen_id; 2962 param->port = work->port->port_num; 2963 work->cm_event.private_data = &sidr_req_msg->private_data; 2964} 2965 2966static int cm_sidr_req_handler(struct cm_work *work) 2967{ 2968 struct ib_cm_id *cm_id; 2969 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2970 struct cm_sidr_req_msg *sidr_req_msg; 2971 struct ib_wc *wc; 2972 2973 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 2974 if (IS_ERR(cm_id)) 2975 return PTR_ERR(cm_id); 2976 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2977 2978 /* Record SGID/SLID and request ID for lookup. */ 2979 sidr_req_msg = (struct cm_sidr_req_msg *) 2980 work->mad_recv_wc->recv_buf.mad; 2981 wc = work->mad_recv_wc->wc; 2982 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2983 cm_id_priv->av.dgid.global.interface_id = 0; 2984 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2985 work->mad_recv_wc->recv_buf.grh, 2986 &cm_id_priv->av); 2987 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2988 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2989 atomic_inc(&cm_id_priv->work_count); 2990 2991 spin_lock_irq(&cm.lock); 2992 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2993 if (cur_cm_id_priv) { 2994 spin_unlock_irq(&cm.lock); 2995 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2996 counter[CM_SIDR_REQ_COUNTER]); 2997 goto out; /* Duplicate message. */ 2998 } 2999 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3000 cur_cm_id_priv = cm_find_listen(cm_id->device, 3001 sidr_req_msg->service_id, 3002 sidr_req_msg->private_data); 3003 if (!cur_cm_id_priv) { 3004 spin_unlock_irq(&cm.lock); 3005 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3006 goto out; /* No match. */ 3007 } 3008 atomic_inc(&cur_cm_id_priv->refcount); 3009 atomic_inc(&cm_id_priv->refcount); 3010 spin_unlock_irq(&cm.lock); 3011 3012 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3013 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3014 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3015 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3016 3017 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3018 cm_process_work(cm_id_priv, work); 3019 cm_deref_id(cur_cm_id_priv); 3020 return 0; 3021out: 3022 ib_destroy_cm_id(&cm_id_priv->id); 3023 return -EINVAL; 3024} 3025 3026static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3027 struct cm_id_private *cm_id_priv, 3028 struct ib_cm_sidr_rep_param *param) 3029{ 3030 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3031 cm_id_priv->tid); 3032 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3033 sidr_rep_msg->status = param->status; 3034 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3035 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3036 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3037 3038 if (param->info && param->info_length) 3039 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3040 3041 if (param->private_data && param->private_data_len) 3042 memcpy(sidr_rep_msg->private_data, param->private_data, 3043 param->private_data_len); 3044} 3045 3046int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3047 struct ib_cm_sidr_rep_param *param) 3048{ 3049 struct cm_id_private *cm_id_priv; 3050 struct ib_mad_send_buf *msg; 3051 unsigned long flags; 3052 int ret; 3053 3054 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3055 (param->private_data && 3056 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3057 return -EINVAL; 3058 3059 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3060 spin_lock_irqsave(&cm_id_priv->lock, flags); 3061 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3062 ret = -EINVAL; 3063 goto error; 3064 } 3065 3066 ret = cm_alloc_msg(cm_id_priv, &msg); 3067 if (ret) 3068 goto error; 3069 3070 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3071 param); 3072 ret = ib_post_send_mad(msg, NULL); 3073 if (ret) { 3074 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3075 cm_free_msg(msg); 3076 return ret; 3077 } 3078 cm_id->state = IB_CM_IDLE; 3079 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3080 3081 spin_lock_irqsave(&cm.lock, flags); 3082 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3083 spin_unlock_irqrestore(&cm.lock, flags); 3084 return 0; 3085 3086error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3087 return ret; 3088} 3089EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3090 3091static void cm_format_sidr_rep_event(struct cm_work *work) 3092{ 3093 struct cm_sidr_rep_msg *sidr_rep_msg; 3094 struct ib_cm_sidr_rep_event_param *param; 3095 3096 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3097 work->mad_recv_wc->recv_buf.mad; 3098 param = &work->cm_event.param.sidr_rep_rcvd; 3099 param->status = sidr_rep_msg->status; 3100 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3101 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3102 param->info = &sidr_rep_msg->info; 3103 param->info_len = sidr_rep_msg->info_length; 3104 work->cm_event.private_data = &sidr_rep_msg->private_data; 3105} 3106 3107static int cm_sidr_rep_handler(struct cm_work *work) 3108{ 3109 struct cm_sidr_rep_msg *sidr_rep_msg; 3110 struct cm_id_private *cm_id_priv; 3111 3112 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3113 work->mad_recv_wc->recv_buf.mad; 3114 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3115 if (!cm_id_priv) 3116 return -EINVAL; /* Unmatched reply. */ 3117 3118 spin_lock_irq(&cm_id_priv->lock); 3119 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3120 spin_unlock_irq(&cm_id_priv->lock); 3121 goto out; 3122 } 3123 cm_id_priv->id.state = IB_CM_IDLE; 3124 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3125 spin_unlock_irq(&cm_id_priv->lock); 3126 3127 cm_format_sidr_rep_event(work); 3128 cm_process_work(cm_id_priv, work); 3129 return 0; 3130out: 3131 cm_deref_id(cm_id_priv); 3132 return -EINVAL; 3133} 3134 3135static void cm_process_send_error(struct ib_mad_send_buf *msg, 3136 enum ib_wc_status wc_status) 3137{ 3138 struct cm_id_private *cm_id_priv; 3139 struct ib_cm_event cm_event; 3140 enum ib_cm_state state; 3141 int ret; 3142 3143 memset(&cm_event, 0, sizeof cm_event); 3144 cm_id_priv = msg->context[0]; 3145 3146 /* Discard old sends or ones without a response. */ 3147 spin_lock_irq(&cm_id_priv->lock); 3148 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3149 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3150 goto discard; 3151 3152 switch (state) { 3153 case IB_CM_REQ_SENT: 3154 case IB_CM_MRA_REQ_RCVD: 3155 cm_reset_to_idle(cm_id_priv); 3156 cm_event.event = IB_CM_REQ_ERROR; 3157 break; 3158 case IB_CM_REP_SENT: 3159 case IB_CM_MRA_REP_RCVD: 3160 cm_reset_to_idle(cm_id_priv); 3161 cm_event.event = IB_CM_REP_ERROR; 3162 break; 3163 case IB_CM_DREQ_SENT: 3164 cm_enter_timewait(cm_id_priv); 3165 cm_event.event = IB_CM_DREQ_ERROR; 3166 break; 3167 case IB_CM_SIDR_REQ_SENT: 3168 cm_id_priv->id.state = IB_CM_IDLE; 3169 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3170 break; 3171 default: 3172 goto discard; 3173 } 3174 spin_unlock_irq(&cm_id_priv->lock); 3175 cm_event.param.send_status = wc_status; 3176 3177 /* No other events can occur on the cm_id at this point. */ 3178 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3179 cm_free_msg(msg); 3180 if (ret) 3181 ib_destroy_cm_id(&cm_id_priv->id); 3182 return; 3183discard: 3184 spin_unlock_irq(&cm_id_priv->lock); 3185 cm_free_msg(msg); 3186} 3187 3188static void cm_send_handler(struct ib_mad_agent *mad_agent, 3189 struct ib_mad_send_wc *mad_send_wc) 3190{ 3191 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3192 struct cm_port *port; 3193 u16 attr_index; 3194 3195 port = mad_agent->context; 3196 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3197 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3198 3199 /* 3200 * If the send was in response to a received message (context[0] is not 3201 * set to a cm_id), and is not a REJ, then it is a send that was 3202 * manually retried. 3203 */ 3204 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3205 msg->retries = 1; 3206 3207 atomic_long_add(1 + msg->retries, 3208 &port->counter_group[CM_XMIT].counter[attr_index]); 3209 if (msg->retries) 3210 atomic_long_add(msg->retries, 3211 &port->counter_group[CM_XMIT_RETRIES]. 3212 counter[attr_index]); 3213 3214 switch (mad_send_wc->status) { 3215 case IB_WC_SUCCESS: 3216 case IB_WC_WR_FLUSH_ERR: 3217 cm_free_msg(msg); 3218 break; 3219 default: 3220 if (msg->context[0] && msg->context[1]) 3221 cm_process_send_error(msg, mad_send_wc->status); 3222 else 3223 cm_free_msg(msg); 3224 break; 3225 } 3226} 3227 3228static void cm_work_handler(struct work_struct *_work) 3229{ 3230 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3231 int ret; 3232 3233 switch (work->cm_event.event) { 3234 case IB_CM_REQ_RECEIVED: 3235 ret = cm_req_handler(work); 3236 break; 3237 case IB_CM_MRA_RECEIVED: 3238 ret = cm_mra_handler(work); 3239 break; 3240 case IB_CM_REJ_RECEIVED: 3241 ret = cm_rej_handler(work); 3242 break; 3243 case IB_CM_REP_RECEIVED: 3244 ret = cm_rep_handler(work); 3245 break; 3246 case IB_CM_RTU_RECEIVED: 3247 ret = cm_rtu_handler(work); 3248 break; 3249 case IB_CM_USER_ESTABLISHED: 3250 ret = cm_establish_handler(work); 3251 break; 3252 case IB_CM_DREQ_RECEIVED: 3253 ret = cm_dreq_handler(work); 3254 break; 3255 case IB_CM_DREP_RECEIVED: 3256 ret = cm_drep_handler(work); 3257 break; 3258 case IB_CM_SIDR_REQ_RECEIVED: 3259 ret = cm_sidr_req_handler(work); 3260 break; 3261 case IB_CM_SIDR_REP_RECEIVED: 3262 ret = cm_sidr_rep_handler(work); 3263 break; 3264 case IB_CM_LAP_RECEIVED: 3265 ret = cm_lap_handler(work); 3266 break; 3267 case IB_CM_APR_RECEIVED: 3268 ret = cm_apr_handler(work); 3269 break; 3270 case IB_CM_TIMEWAIT_EXIT: 3271 ret = cm_timewait_handler(work); 3272 break; 3273 default: 3274 ret = -EINVAL; 3275 break; 3276 } 3277 if (ret) 3278 cm_free_work(work); 3279} 3280 3281static int cm_establish(struct ib_cm_id *cm_id) 3282{ 3283 struct cm_id_private *cm_id_priv; 3284 struct cm_work *work; 3285 unsigned long flags; 3286 int ret = 0; 3287 3288 work = kmalloc(sizeof *work, GFP_ATOMIC); 3289 if (!work) 3290 return -ENOMEM; 3291 3292 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3293 spin_lock_irqsave(&cm_id_priv->lock, flags); 3294 switch (cm_id->state) 3295 { 3296 case IB_CM_REP_SENT: 3297 case IB_CM_MRA_REP_RCVD: 3298 cm_id->state = IB_CM_ESTABLISHED; 3299 break; 3300 case IB_CM_ESTABLISHED: 3301 ret = -EISCONN; 3302 break; 3303 default: 3304 ret = -EINVAL; 3305 break; 3306 } 3307 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3308 3309 if (ret) { 3310 kfree(work); 3311 goto out; 3312 } 3313 3314 /* 3315 * The CM worker thread may try to destroy the cm_id before it 3316 * can execute this work item. To prevent potential deadlock, 3317 * we need to find the cm_id once we're in the context of the 3318 * worker thread, rather than holding a reference on it. 3319 */ 3320 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3321 work->local_id = cm_id->local_id; 3322 work->remote_id = cm_id->remote_id; 3323 work->mad_recv_wc = NULL; 3324 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3325 queue_delayed_work(cm.wq, &work->work, 0); 3326out: 3327 return ret; 3328} 3329 3330static int cm_migrate(struct ib_cm_id *cm_id) 3331{ 3332 struct cm_id_private *cm_id_priv; 3333 unsigned long flags; 3334 int ret = 0; 3335 3336 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3337 spin_lock_irqsave(&cm_id_priv->lock, flags); 3338 if (cm_id->state == IB_CM_ESTABLISHED && 3339 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3340 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3341 cm_id->lap_state = IB_CM_LAP_IDLE; 3342 cm_id_priv->av = cm_id_priv->alt_av; 3343 } else 3344 ret = -EINVAL; 3345 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3346 3347 return ret; 3348} 3349 3350int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3351{ 3352 int ret; 3353 3354 switch (event) { 3355 case IB_EVENT_COMM_EST: 3356 ret = cm_establish(cm_id); 3357 break; 3358 case IB_EVENT_PATH_MIG: 3359 ret = cm_migrate(cm_id); 3360 break; 3361 default: 3362 ret = -EINVAL; 3363 } 3364 return ret; 3365} 3366EXPORT_SYMBOL(ib_cm_notify); 3367 3368static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3369 struct ib_mad_recv_wc *mad_recv_wc) 3370{ 3371 struct cm_port *port = mad_agent->context; 3372 struct cm_work *work; 3373 enum ib_cm_event_type event; 3374 u16 attr_id; 3375 int paths = 0; 3376 3377 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3378 case CM_REQ_ATTR_ID: 3379 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3380 alt_local_lid != 0); 3381 event = IB_CM_REQ_RECEIVED; 3382 break; 3383 case CM_MRA_ATTR_ID: 3384 event = IB_CM_MRA_RECEIVED; 3385 break; 3386 case CM_REJ_ATTR_ID: 3387 event = IB_CM_REJ_RECEIVED; 3388 break; 3389 case CM_REP_ATTR_ID: 3390 event = IB_CM_REP_RECEIVED; 3391 break; 3392 case CM_RTU_ATTR_ID: 3393 event = IB_CM_RTU_RECEIVED; 3394 break; 3395 case CM_DREQ_ATTR_ID: 3396 event = IB_CM_DREQ_RECEIVED; 3397 break; 3398 case CM_DREP_ATTR_ID: 3399 event = IB_CM_DREP_RECEIVED; 3400 break; 3401 case CM_SIDR_REQ_ATTR_ID: 3402 event = IB_CM_SIDR_REQ_RECEIVED; 3403 break; 3404 case CM_SIDR_REP_ATTR_ID: 3405 event = IB_CM_SIDR_REP_RECEIVED; 3406 break; 3407 case CM_LAP_ATTR_ID: 3408 paths = 1; 3409 event = IB_CM_LAP_RECEIVED; 3410 break; 3411 case CM_APR_ATTR_ID: 3412 event = IB_CM_APR_RECEIVED; 3413 break; 3414 default: 3415 ib_free_recv_mad(mad_recv_wc); 3416 return; 3417 } 3418 3419 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3420 atomic_long_inc(&port->counter_group[CM_RECV]. 3421 counter[attr_id - CM_ATTR_ID_OFFSET]); 3422 3423 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3424 GFP_KERNEL); 3425 if (!work) { 3426 ib_free_recv_mad(mad_recv_wc); 3427 return; 3428 } 3429 3430 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3431 work->cm_event.event = event; 3432 work->mad_recv_wc = mad_recv_wc; 3433 work->port = port; 3434 queue_delayed_work(cm.wq, &work->work, 0); 3435} 3436 3437static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3438 struct ib_qp_attr *qp_attr, 3439 int *qp_attr_mask) 3440{ 3441 unsigned long flags; 3442 int ret; 3443 3444 spin_lock_irqsave(&cm_id_priv->lock, flags); 3445 switch (cm_id_priv->id.state) { 3446 case IB_CM_REQ_SENT: 3447 case IB_CM_MRA_REQ_RCVD: 3448 case IB_CM_REQ_RCVD: 3449 case IB_CM_MRA_REQ_SENT: 3450 case IB_CM_REP_RCVD: 3451 case IB_CM_MRA_REP_SENT: 3452 case IB_CM_REP_SENT: 3453 case IB_CM_MRA_REP_RCVD: 3454 case IB_CM_ESTABLISHED: 3455 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3456 IB_QP_PKEY_INDEX | IB_QP_PORT; 3457 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3458 if (cm_id_priv->responder_resources) 3459 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3460 IB_ACCESS_REMOTE_ATOMIC; 3461 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3462 qp_attr->port_num = cm_id_priv->av.port->port_num; 3463 ret = 0; 3464 break; 3465 default: 3466 ret = -EINVAL; 3467 break; 3468 } 3469 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3470 return ret; 3471} 3472 3473static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3474 struct ib_qp_attr *qp_attr, 3475 int *qp_attr_mask) 3476{ 3477 unsigned long flags; 3478 int ret; 3479 3480 spin_lock_irqsave(&cm_id_priv->lock, flags); 3481 switch (cm_id_priv->id.state) { 3482 case IB_CM_REQ_RCVD: 3483 case IB_CM_MRA_REQ_SENT: 3484 case IB_CM_REP_RCVD: 3485 case IB_CM_MRA_REP_SENT: 3486 case IB_CM_REP_SENT: 3487 case IB_CM_MRA_REP_RCVD: 3488 case IB_CM_ESTABLISHED: 3489 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3490 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3491 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3492 qp_attr->path_mtu = cm_id_priv->path_mtu; 3493 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3494 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3495 if (cm_id_priv->qp_type == IB_QPT_RC) { 3496 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3497 IB_QP_MIN_RNR_TIMER; 3498 qp_attr->max_dest_rd_atomic = 3499 cm_id_priv->responder_resources; 3500 qp_attr->min_rnr_timer = 0; 3501 } 3502 if (cm_id_priv->alt_av.ah_attr.dlid) { 3503 *qp_attr_mask |= IB_QP_ALT_PATH; 3504 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3505 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3506 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3507 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3508 } 3509 ret = 0; 3510 break; 3511 default: 3512 ret = -EINVAL; 3513 break; 3514 } 3515 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3516 return ret; 3517} 3518 3519static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3520 struct ib_qp_attr *qp_attr, 3521 int *qp_attr_mask) 3522{ 3523 unsigned long flags; 3524 int ret; 3525 3526 spin_lock_irqsave(&cm_id_priv->lock, flags); 3527 switch (cm_id_priv->id.state) { 3528 /* Allow transition to RTS before sending REP */ 3529 case IB_CM_REQ_RCVD: 3530 case IB_CM_MRA_REQ_SENT: 3531 3532 case IB_CM_REP_RCVD: 3533 case IB_CM_MRA_REP_SENT: 3534 case IB_CM_REP_SENT: 3535 case IB_CM_MRA_REP_RCVD: 3536 case IB_CM_ESTABLISHED: 3537 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3538 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3539 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3540 if (cm_id_priv->qp_type == IB_QPT_RC) { 3541 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3542 IB_QP_RNR_RETRY | 3543 IB_QP_MAX_QP_RD_ATOMIC; 3544 qp_attr->timeout = cm_id_priv->av.timeout; 3545 qp_attr->retry_cnt = cm_id_priv->retry_count; 3546 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3547 qp_attr->max_rd_atomic = 3548 cm_id_priv->initiator_depth; 3549 } 3550 if (cm_id_priv->alt_av.ah_attr.dlid) { 3551 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3552 qp_attr->path_mig_state = IB_MIG_REARM; 3553 } 3554 } else { 3555 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3556 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3557 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3558 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3559 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3560 qp_attr->path_mig_state = IB_MIG_REARM; 3561 } 3562 ret = 0; 3563 break; 3564 default: 3565 ret = -EINVAL; 3566 break; 3567 } 3568 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3569 return ret; 3570} 3571 3572int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3573 struct ib_qp_attr *qp_attr, 3574 int *qp_attr_mask) 3575{ 3576 struct cm_id_private *cm_id_priv; 3577 int ret; 3578 3579 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3580 switch (qp_attr->qp_state) { 3581 case IB_QPS_INIT: 3582 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3583 break; 3584 case IB_QPS_RTR: 3585 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3586 break; 3587 case IB_QPS_RTS: 3588 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3589 break; 3590 default: 3591 ret = -EINVAL; 3592 break; 3593 } 3594 return ret; 3595} 3596EXPORT_SYMBOL(ib_cm_init_qp_attr); 3597 3598static void cm_get_ack_delay(struct cm_device *cm_dev) 3599{ 3600 struct ib_device_attr attr; 3601 3602 if (ib_query_device(cm_dev->ib_device, &attr)) 3603 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3604 else 3605 cm_dev->ack_delay = attr.local_ca_ack_delay; 3606} 3607 3608static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3609 char *buf) 3610{ 3611 struct cm_counter_group *group; 3612 struct cm_counter_attribute *cm_attr; 3613 3614 group = container_of(obj, struct cm_counter_group, obj); 3615 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3616 3617 return sprintf(buf, "%ld\n", 3618 atomic_long_read(&group->counter[cm_attr->index])); 3619} 3620 3621static const struct sysfs_ops cm_counter_ops = { 3622 .show = cm_show_counter 3623}; 3624 3625static struct kobj_type cm_counter_obj_type = { 3626 .sysfs_ops = &cm_counter_ops, 3627 .default_attrs = cm_counter_default_attrs 3628}; 3629 3630static void cm_release_port_obj(struct kobject *obj) 3631{ 3632 struct cm_port *cm_port; 3633 3634 cm_port = container_of(obj, struct cm_port, port_obj); 3635 kfree(cm_port); 3636} 3637 3638static struct kobj_type cm_port_obj_type = { 3639 .release = cm_release_port_obj 3640}; 3641 3642static char *cm_devnode(struct device *dev, mode_t *mode) 3643{ 3644 if (mode) 3645 *mode = 0666; 3646 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3647} 3648 3649struct class cm_class = { 3650 .owner = THIS_MODULE, 3651 .name = "infiniband_cm", 3652 .devnode = cm_devnode, 3653}; 3654EXPORT_SYMBOL(cm_class); 3655 3656static int cm_create_port_fs(struct cm_port *port) 3657{ 3658 int i, ret; 3659 3660 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3661 &port->cm_dev->device->kobj, 3662 "%d", port->port_num); 3663 if (ret) { 3664 kfree(port); 3665 return ret; 3666 } 3667 3668 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3669 ret = kobject_init_and_add(&port->counter_group[i].obj, 3670 &cm_counter_obj_type, 3671 &port->port_obj, 3672 "%s", counter_group_names[i]); 3673 if (ret) 3674 goto error; 3675 } 3676 3677 return 0; 3678 3679error: 3680 while (i--) 3681 kobject_put(&port->counter_group[i].obj); 3682 kobject_put(&port->port_obj); 3683 return ret; 3684 3685} 3686 3687static void cm_remove_port_fs(struct cm_port *port) 3688{ 3689 int i; 3690 3691 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3692 kobject_put(&port->counter_group[i].obj); 3693 3694 kobject_put(&port->port_obj); 3695} 3696 3697static void cm_add_one(struct ib_device *ib_device) 3698{ 3699 struct cm_device *cm_dev; 3700 struct cm_port *port; 3701 struct ib_mad_reg_req reg_req = { 3702 .mgmt_class = IB_MGMT_CLASS_CM, 3703 .mgmt_class_version = IB_CM_CLASS_VERSION 3704 }; 3705 struct ib_port_modify port_modify = { 3706 .set_port_cap_mask = IB_PORT_CM_SUP 3707 }; 3708 unsigned long flags; 3709 int ret; 3710 u8 i; 3711 3712 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3713 return; 3714 3715 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3716 ib_device->phys_port_cnt, GFP_KERNEL); 3717 if (!cm_dev) 3718 return; 3719 3720 cm_dev->ib_device = ib_device; 3721 cm_get_ack_delay(cm_dev); 3722 3723 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3724 MKDEV(0, 0), NULL, 3725 "%s", ib_device->name); 3726 if (IS_ERR(cm_dev->device)) { 3727 kfree(cm_dev); 3728 return; 3729 } 3730 3731 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3732 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3733 port = kzalloc(sizeof *port, GFP_KERNEL); 3734 if (!port) 3735 goto error1; 3736 3737 cm_dev->port[i-1] = port; 3738 port->cm_dev = cm_dev; 3739 port->port_num = i; 3740 3741 ret = cm_create_port_fs(port); 3742 if (ret) 3743 goto error1; 3744 3745 port->mad_agent = ib_register_mad_agent(ib_device, i, 3746 IB_QPT_GSI, 3747 ®_req, 3748 0, 3749 cm_send_handler, 3750 cm_recv_handler, 3751 port); 3752 if (IS_ERR(port->mad_agent)) 3753 goto error2; 3754 3755 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3756 if (ret) 3757 goto error3; 3758 } 3759 ib_set_client_data(ib_device, &cm_client, cm_dev); 3760 3761 write_lock_irqsave(&cm.device_lock, flags); 3762 list_add_tail(&cm_dev->list, &cm.device_list); 3763 write_unlock_irqrestore(&cm.device_lock, flags); 3764 return; 3765 3766error3: 3767 ib_unregister_mad_agent(port->mad_agent); 3768error2: 3769 cm_remove_port_fs(port); 3770error1: 3771 port_modify.set_port_cap_mask = 0; 3772 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3773 while (--i) { 3774 port = cm_dev->port[i-1]; 3775 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3776 ib_unregister_mad_agent(port->mad_agent); 3777 cm_remove_port_fs(port); 3778 } 3779 device_unregister(cm_dev->device); 3780 kfree(cm_dev); 3781} 3782 3783static void cm_remove_one(struct ib_device *ib_device) 3784{ 3785 struct cm_device *cm_dev; 3786 struct cm_port *port; 3787 struct ib_port_modify port_modify = { 3788 .clr_port_cap_mask = IB_PORT_CM_SUP 3789 }; 3790 unsigned long flags; 3791 int i; 3792 3793 cm_dev = ib_get_client_data(ib_device, &cm_client); 3794 if (!cm_dev) 3795 return; 3796 3797 write_lock_irqsave(&cm.device_lock, flags); 3798 list_del(&cm_dev->list); 3799 write_unlock_irqrestore(&cm.device_lock, flags); 3800 3801 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3802 port = cm_dev->port[i-1]; 3803 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3804 ib_unregister_mad_agent(port->mad_agent); 3805 flush_workqueue(cm.wq); 3806 cm_remove_port_fs(port); 3807 } 3808 device_unregister(cm_dev->device); 3809 kfree(cm_dev); 3810} 3811 3812static int __init ib_cm_init(void) 3813{ 3814 int ret; 3815 3816 memset(&cm, 0, sizeof cm); 3817 INIT_LIST_HEAD(&cm.device_list); 3818 rwlock_init(&cm.device_lock); 3819 spin_lock_init(&cm.lock); 3820 cm.listen_service_table = RB_ROOT; 3821 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3822 cm.remote_id_table = RB_ROOT; 3823 cm.remote_qp_table = RB_ROOT; 3824 cm.remote_sidr_table = RB_ROOT; 3825 idr_init(&cm.local_id_table); 3826 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3827 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3828 INIT_LIST_HEAD(&cm.timewait_list); 3829 3830 ret = class_register(&cm_class); 3831 if (ret) 3832 return -ENOMEM; 3833 3834 cm.wq = create_workqueue("ib_cm"); 3835 if (!cm.wq) { 3836 ret = -ENOMEM; 3837 goto error1; 3838 } 3839 3840 ret = ib_register_client(&cm_client); 3841 if (ret) 3842 goto error2; 3843 3844 return 0; 3845error2: 3846 destroy_workqueue(cm.wq); 3847error1: 3848 class_unregister(&cm_class); 3849 return ret; 3850} 3851 3852static void __exit ib_cm_cleanup(void) 3853{ 3854 struct cm_timewait_info *timewait_info, *tmp; 3855 3856 spin_lock_irq(&cm.lock); 3857 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3858 cancel_delayed_work(&timewait_info->work.work); 3859 spin_unlock_irq(&cm.lock); 3860 3861 ib_unregister_client(&cm_client); 3862 destroy_workqueue(cm.wq); 3863 3864 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3865 list_del(&timewait_info->list); 3866 kfree(timewait_info); 3867 } 3868 3869 class_unregister(&cm_class); 3870 idr_destroy(&cm.local_id_table); 3871} 3872 3873module_init(ib_cm_init); 3874module_exit(ib_cm_cleanup); 3875 3876