cm.c revision 5a0e3ad6af8660be21ca98a971cd00f331318c05
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 ret = cm_alloc_msg(cm_id_priv, &msg); 1992 if (ret) { 1993 cm_enter_timewait(cm_id_priv); 1994 goto out; 1995 } 1996 1997 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1998 private_data, private_data_len); 1999 msg->timeout_ms = cm_id_priv->timeout_ms; 2000 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2001 2002 ret = ib_post_send_mad(msg, NULL); 2003 if (ret) { 2004 cm_enter_timewait(cm_id_priv); 2005 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2006 cm_free_msg(msg); 2007 return ret; 2008 } 2009 2010 cm_id->state = IB_CM_DREQ_SENT; 2011 cm_id_priv->msg = msg; 2012out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2013 return ret; 2014} 2015EXPORT_SYMBOL(ib_send_cm_dreq); 2016 2017static void cm_format_drep(struct cm_drep_msg *drep_msg, 2018 struct cm_id_private *cm_id_priv, 2019 const void *private_data, 2020 u8 private_data_len) 2021{ 2022 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2023 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2024 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2025 2026 if (private_data && private_data_len) 2027 memcpy(drep_msg->private_data, private_data, private_data_len); 2028} 2029 2030int ib_send_cm_drep(struct ib_cm_id *cm_id, 2031 const void *private_data, 2032 u8 private_data_len) 2033{ 2034 struct cm_id_private *cm_id_priv; 2035 struct ib_mad_send_buf *msg; 2036 unsigned long flags; 2037 void *data; 2038 int ret; 2039 2040 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2041 return -EINVAL; 2042 2043 data = cm_copy_private_data(private_data, private_data_len); 2044 if (IS_ERR(data)) 2045 return PTR_ERR(data); 2046 2047 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2048 spin_lock_irqsave(&cm_id_priv->lock, flags); 2049 if (cm_id->state != IB_CM_DREQ_RCVD) { 2050 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2051 kfree(data); 2052 return -EINVAL; 2053 } 2054 2055 cm_set_private_data(cm_id_priv, data, private_data_len); 2056 cm_enter_timewait(cm_id_priv); 2057 2058 ret = cm_alloc_msg(cm_id_priv, &msg); 2059 if (ret) 2060 goto out; 2061 2062 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2063 private_data, private_data_len); 2064 2065 ret = ib_post_send_mad(msg, NULL); 2066 if (ret) { 2067 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2068 cm_free_msg(msg); 2069 return ret; 2070 } 2071 2072out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2073 return ret; 2074} 2075EXPORT_SYMBOL(ib_send_cm_drep); 2076 2077static int cm_issue_drep(struct cm_port *port, 2078 struct ib_mad_recv_wc *mad_recv_wc) 2079{ 2080 struct ib_mad_send_buf *msg = NULL; 2081 struct cm_dreq_msg *dreq_msg; 2082 struct cm_drep_msg *drep_msg; 2083 int ret; 2084 2085 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2086 if (ret) 2087 return ret; 2088 2089 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2090 drep_msg = (struct cm_drep_msg *) msg->mad; 2091 2092 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2093 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2094 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2095 2096 ret = ib_post_send_mad(msg, NULL); 2097 if (ret) 2098 cm_free_msg(msg); 2099 2100 return ret; 2101} 2102 2103static int cm_dreq_handler(struct cm_work *work) 2104{ 2105 struct cm_id_private *cm_id_priv; 2106 struct cm_dreq_msg *dreq_msg; 2107 struct ib_mad_send_buf *msg = NULL; 2108 int ret; 2109 2110 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2111 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2112 dreq_msg->local_comm_id); 2113 if (!cm_id_priv) { 2114 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2115 counter[CM_DREQ_COUNTER]); 2116 cm_issue_drep(work->port, work->mad_recv_wc); 2117 return -EINVAL; 2118 } 2119 2120 work->cm_event.private_data = &dreq_msg->private_data; 2121 2122 spin_lock_irq(&cm_id_priv->lock); 2123 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2124 goto unlock; 2125 2126 switch (cm_id_priv->id.state) { 2127 case IB_CM_REP_SENT: 2128 case IB_CM_DREQ_SENT: 2129 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2130 break; 2131 case IB_CM_ESTABLISHED: 2132 case IB_CM_MRA_REP_RCVD: 2133 break; 2134 case IB_CM_TIMEWAIT: 2135 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2136 counter[CM_DREQ_COUNTER]); 2137 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2138 goto unlock; 2139 2140 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2141 cm_id_priv->private_data, 2142 cm_id_priv->private_data_len); 2143 spin_unlock_irq(&cm_id_priv->lock); 2144 2145 if (ib_post_send_mad(msg, NULL)) 2146 cm_free_msg(msg); 2147 goto deref; 2148 case IB_CM_DREQ_RCVD: 2149 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2150 counter[CM_DREQ_COUNTER]); 2151 goto unlock; 2152 default: 2153 goto unlock; 2154 } 2155 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2156 cm_id_priv->tid = dreq_msg->hdr.tid; 2157 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2158 if (!ret) 2159 list_add_tail(&work->list, &cm_id_priv->work_list); 2160 spin_unlock_irq(&cm_id_priv->lock); 2161 2162 if (ret) 2163 cm_process_work(cm_id_priv, work); 2164 else 2165 cm_deref_id(cm_id_priv); 2166 return 0; 2167 2168unlock: spin_unlock_irq(&cm_id_priv->lock); 2169deref: cm_deref_id(cm_id_priv); 2170 return -EINVAL; 2171} 2172 2173static int cm_drep_handler(struct cm_work *work) 2174{ 2175 struct cm_id_private *cm_id_priv; 2176 struct cm_drep_msg *drep_msg; 2177 int ret; 2178 2179 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2180 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2181 drep_msg->local_comm_id); 2182 if (!cm_id_priv) 2183 return -EINVAL; 2184 2185 work->cm_event.private_data = &drep_msg->private_data; 2186 2187 spin_lock_irq(&cm_id_priv->lock); 2188 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2189 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2190 spin_unlock_irq(&cm_id_priv->lock); 2191 goto out; 2192 } 2193 cm_enter_timewait(cm_id_priv); 2194 2195 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2196 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2197 if (!ret) 2198 list_add_tail(&work->list, &cm_id_priv->work_list); 2199 spin_unlock_irq(&cm_id_priv->lock); 2200 2201 if (ret) 2202 cm_process_work(cm_id_priv, work); 2203 else 2204 cm_deref_id(cm_id_priv); 2205 return 0; 2206out: 2207 cm_deref_id(cm_id_priv); 2208 return -EINVAL; 2209} 2210 2211int ib_send_cm_rej(struct ib_cm_id *cm_id, 2212 enum ib_cm_rej_reason reason, 2213 void *ari, 2214 u8 ari_length, 2215 const void *private_data, 2216 u8 private_data_len) 2217{ 2218 struct cm_id_private *cm_id_priv; 2219 struct ib_mad_send_buf *msg; 2220 unsigned long flags; 2221 int ret; 2222 2223 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2224 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2225 return -EINVAL; 2226 2227 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2228 2229 spin_lock_irqsave(&cm_id_priv->lock, flags); 2230 switch (cm_id->state) { 2231 case IB_CM_REQ_SENT: 2232 case IB_CM_MRA_REQ_RCVD: 2233 case IB_CM_REQ_RCVD: 2234 case IB_CM_MRA_REQ_SENT: 2235 case IB_CM_REP_RCVD: 2236 case IB_CM_MRA_REP_SENT: 2237 ret = cm_alloc_msg(cm_id_priv, &msg); 2238 if (!ret) 2239 cm_format_rej((struct cm_rej_msg *) msg->mad, 2240 cm_id_priv, reason, ari, ari_length, 2241 private_data, private_data_len); 2242 2243 cm_reset_to_idle(cm_id_priv); 2244 break; 2245 case IB_CM_REP_SENT: 2246 case IB_CM_MRA_REP_RCVD: 2247 ret = cm_alloc_msg(cm_id_priv, &msg); 2248 if (!ret) 2249 cm_format_rej((struct cm_rej_msg *) msg->mad, 2250 cm_id_priv, reason, ari, ari_length, 2251 private_data, private_data_len); 2252 2253 cm_enter_timewait(cm_id_priv); 2254 break; 2255 default: 2256 ret = -EINVAL; 2257 goto out; 2258 } 2259 2260 if (ret) 2261 goto out; 2262 2263 ret = ib_post_send_mad(msg, NULL); 2264 if (ret) 2265 cm_free_msg(msg); 2266 2267out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2268 return ret; 2269} 2270EXPORT_SYMBOL(ib_send_cm_rej); 2271 2272static void cm_format_rej_event(struct cm_work *work) 2273{ 2274 struct cm_rej_msg *rej_msg; 2275 struct ib_cm_rej_event_param *param; 2276 2277 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2278 param = &work->cm_event.param.rej_rcvd; 2279 param->ari = rej_msg->ari; 2280 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2281 param->reason = __be16_to_cpu(rej_msg->reason); 2282 work->cm_event.private_data = &rej_msg->private_data; 2283} 2284 2285static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2286{ 2287 struct cm_timewait_info *timewait_info; 2288 struct cm_id_private *cm_id_priv; 2289 __be32 remote_id; 2290 2291 remote_id = rej_msg->local_comm_id; 2292 2293 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2294 spin_lock_irq(&cm.lock); 2295 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2296 remote_id); 2297 if (!timewait_info) { 2298 spin_unlock_irq(&cm.lock); 2299 return NULL; 2300 } 2301 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2302 (timewait_info->work.local_id ^ 2303 cm.random_id_operand)); 2304 if (cm_id_priv) { 2305 if (cm_id_priv->id.remote_id == remote_id) 2306 atomic_inc(&cm_id_priv->refcount); 2307 else 2308 cm_id_priv = NULL; 2309 } 2310 spin_unlock_irq(&cm.lock); 2311 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2312 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2313 else 2314 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2315 2316 return cm_id_priv; 2317} 2318 2319static int cm_rej_handler(struct cm_work *work) 2320{ 2321 struct cm_id_private *cm_id_priv; 2322 struct cm_rej_msg *rej_msg; 2323 int ret; 2324 2325 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2326 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2327 if (!cm_id_priv) 2328 return -EINVAL; 2329 2330 cm_format_rej_event(work); 2331 2332 spin_lock_irq(&cm_id_priv->lock); 2333 switch (cm_id_priv->id.state) { 2334 case IB_CM_REQ_SENT: 2335 case IB_CM_MRA_REQ_RCVD: 2336 case IB_CM_REP_SENT: 2337 case IB_CM_MRA_REP_RCVD: 2338 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2339 /* fall through */ 2340 case IB_CM_REQ_RCVD: 2341 case IB_CM_MRA_REQ_SENT: 2342 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2343 cm_enter_timewait(cm_id_priv); 2344 else 2345 cm_reset_to_idle(cm_id_priv); 2346 break; 2347 case IB_CM_DREQ_SENT: 2348 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2349 /* fall through */ 2350 case IB_CM_REP_RCVD: 2351 case IB_CM_MRA_REP_SENT: 2352 case IB_CM_ESTABLISHED: 2353 cm_enter_timewait(cm_id_priv); 2354 break; 2355 default: 2356 spin_unlock_irq(&cm_id_priv->lock); 2357 ret = -EINVAL; 2358 goto out; 2359 } 2360 2361 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2362 if (!ret) 2363 list_add_tail(&work->list, &cm_id_priv->work_list); 2364 spin_unlock_irq(&cm_id_priv->lock); 2365 2366 if (ret) 2367 cm_process_work(cm_id_priv, work); 2368 else 2369 cm_deref_id(cm_id_priv); 2370 return 0; 2371out: 2372 cm_deref_id(cm_id_priv); 2373 return -EINVAL; 2374} 2375 2376int ib_send_cm_mra(struct ib_cm_id *cm_id, 2377 u8 service_timeout, 2378 const void *private_data, 2379 u8 private_data_len) 2380{ 2381 struct cm_id_private *cm_id_priv; 2382 struct ib_mad_send_buf *msg; 2383 enum ib_cm_state cm_state; 2384 enum ib_cm_lap_state lap_state; 2385 enum cm_msg_response msg_response; 2386 void *data; 2387 unsigned long flags; 2388 int ret; 2389 2390 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2391 return -EINVAL; 2392 2393 data = cm_copy_private_data(private_data, private_data_len); 2394 if (IS_ERR(data)) 2395 return PTR_ERR(data); 2396 2397 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2398 2399 spin_lock_irqsave(&cm_id_priv->lock, flags); 2400 switch(cm_id_priv->id.state) { 2401 case IB_CM_REQ_RCVD: 2402 cm_state = IB_CM_MRA_REQ_SENT; 2403 lap_state = cm_id->lap_state; 2404 msg_response = CM_MSG_RESPONSE_REQ; 2405 break; 2406 case IB_CM_REP_RCVD: 2407 cm_state = IB_CM_MRA_REP_SENT; 2408 lap_state = cm_id->lap_state; 2409 msg_response = CM_MSG_RESPONSE_REP; 2410 break; 2411 case IB_CM_ESTABLISHED: 2412 cm_state = cm_id->state; 2413 lap_state = IB_CM_MRA_LAP_SENT; 2414 msg_response = CM_MSG_RESPONSE_OTHER; 2415 break; 2416 default: 2417 ret = -EINVAL; 2418 goto error1; 2419 } 2420 2421 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2422 ret = cm_alloc_msg(cm_id_priv, &msg); 2423 if (ret) 2424 goto error1; 2425 2426 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2427 msg_response, service_timeout, 2428 private_data, private_data_len); 2429 ret = ib_post_send_mad(msg, NULL); 2430 if (ret) 2431 goto error2; 2432 } 2433 2434 cm_id->state = cm_state; 2435 cm_id->lap_state = lap_state; 2436 cm_id_priv->service_timeout = service_timeout; 2437 cm_set_private_data(cm_id_priv, data, private_data_len); 2438 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2439 return 0; 2440 2441error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2442 kfree(data); 2443 return ret; 2444 2445error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2446 kfree(data); 2447 cm_free_msg(msg); 2448 return ret; 2449} 2450EXPORT_SYMBOL(ib_send_cm_mra); 2451 2452static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2453{ 2454 switch (cm_mra_get_msg_mraed(mra_msg)) { 2455 case CM_MSG_RESPONSE_REQ: 2456 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2457 case CM_MSG_RESPONSE_REP: 2458 case CM_MSG_RESPONSE_OTHER: 2459 return cm_acquire_id(mra_msg->remote_comm_id, 2460 mra_msg->local_comm_id); 2461 default: 2462 return NULL; 2463 } 2464} 2465 2466static int cm_mra_handler(struct cm_work *work) 2467{ 2468 struct cm_id_private *cm_id_priv; 2469 struct cm_mra_msg *mra_msg; 2470 int timeout, ret; 2471 2472 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2473 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2474 if (!cm_id_priv) 2475 return -EINVAL; 2476 2477 work->cm_event.private_data = &mra_msg->private_data; 2478 work->cm_event.param.mra_rcvd.service_timeout = 2479 cm_mra_get_service_timeout(mra_msg); 2480 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2481 cm_convert_to_ms(cm_id_priv->av.timeout); 2482 2483 spin_lock_irq(&cm_id_priv->lock); 2484 switch (cm_id_priv->id.state) { 2485 case IB_CM_REQ_SENT: 2486 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2487 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2488 cm_id_priv->msg, timeout)) 2489 goto out; 2490 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2491 break; 2492 case IB_CM_REP_SENT: 2493 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2494 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2495 cm_id_priv->msg, timeout)) 2496 goto out; 2497 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2498 break; 2499 case IB_CM_ESTABLISHED: 2500 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2501 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2502 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2503 cm_id_priv->msg, timeout)) { 2504 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2505 atomic_long_inc(&work->port-> 2506 counter_group[CM_RECV_DUPLICATES]. 2507 counter[CM_MRA_COUNTER]); 2508 goto out; 2509 } 2510 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2511 break; 2512 case IB_CM_MRA_REQ_RCVD: 2513 case IB_CM_MRA_REP_RCVD: 2514 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2515 counter[CM_MRA_COUNTER]); 2516 /* fall through */ 2517 default: 2518 goto out; 2519 } 2520 2521 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2522 cm_id_priv->id.state; 2523 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2524 if (!ret) 2525 list_add_tail(&work->list, &cm_id_priv->work_list); 2526 spin_unlock_irq(&cm_id_priv->lock); 2527 2528 if (ret) 2529 cm_process_work(cm_id_priv, work); 2530 else 2531 cm_deref_id(cm_id_priv); 2532 return 0; 2533out: 2534 spin_unlock_irq(&cm_id_priv->lock); 2535 cm_deref_id(cm_id_priv); 2536 return -EINVAL; 2537} 2538 2539static void cm_format_lap(struct cm_lap_msg *lap_msg, 2540 struct cm_id_private *cm_id_priv, 2541 struct ib_sa_path_rec *alternate_path, 2542 const void *private_data, 2543 u8 private_data_len) 2544{ 2545 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2546 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2547 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2548 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2549 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2550 /* todo: need remote CM response timeout */ 2551 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2552 lap_msg->alt_local_lid = alternate_path->slid; 2553 lap_msg->alt_remote_lid = alternate_path->dlid; 2554 lap_msg->alt_local_gid = alternate_path->sgid; 2555 lap_msg->alt_remote_gid = alternate_path->dgid; 2556 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2557 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2558 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2559 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2560 cm_lap_set_sl(lap_msg, alternate_path->sl); 2561 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2562 cm_lap_set_local_ack_timeout(lap_msg, 2563 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2564 alternate_path->packet_life_time)); 2565 2566 if (private_data && private_data_len) 2567 memcpy(lap_msg->private_data, private_data, private_data_len); 2568} 2569 2570int ib_send_cm_lap(struct ib_cm_id *cm_id, 2571 struct ib_sa_path_rec *alternate_path, 2572 const void *private_data, 2573 u8 private_data_len) 2574{ 2575 struct cm_id_private *cm_id_priv; 2576 struct ib_mad_send_buf *msg; 2577 unsigned long flags; 2578 int ret; 2579 2580 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2581 return -EINVAL; 2582 2583 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2584 spin_lock_irqsave(&cm_id_priv->lock, flags); 2585 if (cm_id->state != IB_CM_ESTABLISHED || 2586 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2587 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2588 ret = -EINVAL; 2589 goto out; 2590 } 2591 2592 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2593 if (ret) 2594 goto out; 2595 cm_id_priv->alt_av.timeout = 2596 cm_ack_timeout(cm_id_priv->target_ack_delay, 2597 cm_id_priv->alt_av.timeout - 1); 2598 2599 ret = cm_alloc_msg(cm_id_priv, &msg); 2600 if (ret) 2601 goto out; 2602 2603 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2604 alternate_path, private_data, private_data_len); 2605 msg->timeout_ms = cm_id_priv->timeout_ms; 2606 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2607 2608 ret = ib_post_send_mad(msg, NULL); 2609 if (ret) { 2610 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2611 cm_free_msg(msg); 2612 return ret; 2613 } 2614 2615 cm_id->lap_state = IB_CM_LAP_SENT; 2616 cm_id_priv->msg = msg; 2617 2618out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2619 return ret; 2620} 2621EXPORT_SYMBOL(ib_send_cm_lap); 2622 2623static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2624 struct ib_sa_path_rec *path, 2625 struct cm_lap_msg *lap_msg) 2626{ 2627 memset(path, 0, sizeof *path); 2628 path->dgid = lap_msg->alt_local_gid; 2629 path->sgid = lap_msg->alt_remote_gid; 2630 path->dlid = lap_msg->alt_local_lid; 2631 path->slid = lap_msg->alt_remote_lid; 2632 path->flow_label = cm_lap_get_flow_label(lap_msg); 2633 path->hop_limit = lap_msg->alt_hop_limit; 2634 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2635 path->reversible = 1; 2636 path->pkey = cm_id_priv->pkey; 2637 path->sl = cm_lap_get_sl(lap_msg); 2638 path->mtu_selector = IB_SA_EQ; 2639 path->mtu = cm_id_priv->path_mtu; 2640 path->rate_selector = IB_SA_EQ; 2641 path->rate = cm_lap_get_packet_rate(lap_msg); 2642 path->packet_life_time_selector = IB_SA_EQ; 2643 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2644 path->packet_life_time -= (path->packet_life_time > 0); 2645} 2646 2647static int cm_lap_handler(struct cm_work *work) 2648{ 2649 struct cm_id_private *cm_id_priv; 2650 struct cm_lap_msg *lap_msg; 2651 struct ib_cm_lap_event_param *param; 2652 struct ib_mad_send_buf *msg = NULL; 2653 int ret; 2654 2655 /* todo: verify LAP request and send reject APR if invalid. */ 2656 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2657 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2658 lap_msg->local_comm_id); 2659 if (!cm_id_priv) 2660 return -EINVAL; 2661 2662 param = &work->cm_event.param.lap_rcvd; 2663 param->alternate_path = &work->path[0]; 2664 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2665 work->cm_event.private_data = &lap_msg->private_data; 2666 2667 spin_lock_irq(&cm_id_priv->lock); 2668 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2669 goto unlock; 2670 2671 switch (cm_id_priv->id.lap_state) { 2672 case IB_CM_LAP_UNINIT: 2673 case IB_CM_LAP_IDLE: 2674 break; 2675 case IB_CM_MRA_LAP_SENT: 2676 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2677 counter[CM_LAP_COUNTER]); 2678 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2679 goto unlock; 2680 2681 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2682 CM_MSG_RESPONSE_OTHER, 2683 cm_id_priv->service_timeout, 2684 cm_id_priv->private_data, 2685 cm_id_priv->private_data_len); 2686 spin_unlock_irq(&cm_id_priv->lock); 2687 2688 if (ib_post_send_mad(msg, NULL)) 2689 cm_free_msg(msg); 2690 goto deref; 2691 case IB_CM_LAP_RCVD: 2692 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2693 counter[CM_LAP_COUNTER]); 2694 goto unlock; 2695 default: 2696 goto unlock; 2697 } 2698 2699 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2700 cm_id_priv->tid = lap_msg->hdr.tid; 2701 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2702 work->mad_recv_wc->recv_buf.grh, 2703 &cm_id_priv->av); 2704 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2705 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2706 if (!ret) 2707 list_add_tail(&work->list, &cm_id_priv->work_list); 2708 spin_unlock_irq(&cm_id_priv->lock); 2709 2710 if (ret) 2711 cm_process_work(cm_id_priv, work); 2712 else 2713 cm_deref_id(cm_id_priv); 2714 return 0; 2715 2716unlock: spin_unlock_irq(&cm_id_priv->lock); 2717deref: cm_deref_id(cm_id_priv); 2718 return -EINVAL; 2719} 2720 2721static void cm_format_apr(struct cm_apr_msg *apr_msg, 2722 struct cm_id_private *cm_id_priv, 2723 enum ib_cm_apr_status status, 2724 void *info, 2725 u8 info_length, 2726 const void *private_data, 2727 u8 private_data_len) 2728{ 2729 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2730 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2731 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2732 apr_msg->ap_status = (u8) status; 2733 2734 if (info && info_length) { 2735 apr_msg->info_length = info_length; 2736 memcpy(apr_msg->info, info, info_length); 2737 } 2738 2739 if (private_data && private_data_len) 2740 memcpy(apr_msg->private_data, private_data, private_data_len); 2741} 2742 2743int ib_send_cm_apr(struct ib_cm_id *cm_id, 2744 enum ib_cm_apr_status status, 2745 void *info, 2746 u8 info_length, 2747 const void *private_data, 2748 u8 private_data_len) 2749{ 2750 struct cm_id_private *cm_id_priv; 2751 struct ib_mad_send_buf *msg; 2752 unsigned long flags; 2753 int ret; 2754 2755 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2756 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2757 return -EINVAL; 2758 2759 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2760 spin_lock_irqsave(&cm_id_priv->lock, flags); 2761 if (cm_id->state != IB_CM_ESTABLISHED || 2762 (cm_id->lap_state != IB_CM_LAP_RCVD && 2763 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2764 ret = -EINVAL; 2765 goto out; 2766 } 2767 2768 ret = cm_alloc_msg(cm_id_priv, &msg); 2769 if (ret) 2770 goto out; 2771 2772 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2773 info, info_length, private_data, private_data_len); 2774 ret = ib_post_send_mad(msg, NULL); 2775 if (ret) { 2776 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2777 cm_free_msg(msg); 2778 return ret; 2779 } 2780 2781 cm_id->lap_state = IB_CM_LAP_IDLE; 2782out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2783 return ret; 2784} 2785EXPORT_SYMBOL(ib_send_cm_apr); 2786 2787static int cm_apr_handler(struct cm_work *work) 2788{ 2789 struct cm_id_private *cm_id_priv; 2790 struct cm_apr_msg *apr_msg; 2791 int ret; 2792 2793 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2794 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2795 apr_msg->local_comm_id); 2796 if (!cm_id_priv) 2797 return -EINVAL; /* Unmatched reply. */ 2798 2799 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2800 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2801 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2802 work->cm_event.private_data = &apr_msg->private_data; 2803 2804 spin_lock_irq(&cm_id_priv->lock); 2805 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2806 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2807 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2808 spin_unlock_irq(&cm_id_priv->lock); 2809 goto out; 2810 } 2811 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2812 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2813 cm_id_priv->msg = NULL; 2814 2815 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2816 if (!ret) 2817 list_add_tail(&work->list, &cm_id_priv->work_list); 2818 spin_unlock_irq(&cm_id_priv->lock); 2819 2820 if (ret) 2821 cm_process_work(cm_id_priv, work); 2822 else 2823 cm_deref_id(cm_id_priv); 2824 return 0; 2825out: 2826 cm_deref_id(cm_id_priv); 2827 return -EINVAL; 2828} 2829 2830static int cm_timewait_handler(struct cm_work *work) 2831{ 2832 struct cm_timewait_info *timewait_info; 2833 struct cm_id_private *cm_id_priv; 2834 int ret; 2835 2836 timewait_info = (struct cm_timewait_info *)work; 2837 spin_lock_irq(&cm.lock); 2838 list_del(&timewait_info->list); 2839 spin_unlock_irq(&cm.lock); 2840 2841 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2842 timewait_info->work.remote_id); 2843 if (!cm_id_priv) 2844 return -EINVAL; 2845 2846 spin_lock_irq(&cm_id_priv->lock); 2847 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2848 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2849 spin_unlock_irq(&cm_id_priv->lock); 2850 goto out; 2851 } 2852 cm_id_priv->id.state = IB_CM_IDLE; 2853 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2854 if (!ret) 2855 list_add_tail(&work->list, &cm_id_priv->work_list); 2856 spin_unlock_irq(&cm_id_priv->lock); 2857 2858 if (ret) 2859 cm_process_work(cm_id_priv, work); 2860 else 2861 cm_deref_id(cm_id_priv); 2862 return 0; 2863out: 2864 cm_deref_id(cm_id_priv); 2865 return -EINVAL; 2866} 2867 2868static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2869 struct cm_id_private *cm_id_priv, 2870 struct ib_cm_sidr_req_param *param) 2871{ 2872 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2873 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2874 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2875 sidr_req_msg->pkey = param->path->pkey; 2876 sidr_req_msg->service_id = param->service_id; 2877 2878 if (param->private_data && param->private_data_len) 2879 memcpy(sidr_req_msg->private_data, param->private_data, 2880 param->private_data_len); 2881} 2882 2883int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2884 struct ib_cm_sidr_req_param *param) 2885{ 2886 struct cm_id_private *cm_id_priv; 2887 struct ib_mad_send_buf *msg; 2888 unsigned long flags; 2889 int ret; 2890 2891 if (!param->path || (param->private_data && 2892 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2893 return -EINVAL; 2894 2895 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2896 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2897 if (ret) 2898 goto out; 2899 2900 cm_id->service_id = param->service_id; 2901 cm_id->service_mask = ~cpu_to_be64(0); 2902 cm_id_priv->timeout_ms = param->timeout_ms; 2903 cm_id_priv->max_cm_retries = param->max_cm_retries; 2904 ret = cm_alloc_msg(cm_id_priv, &msg); 2905 if (ret) 2906 goto out; 2907 2908 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2909 param); 2910 msg->timeout_ms = cm_id_priv->timeout_ms; 2911 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2912 2913 spin_lock_irqsave(&cm_id_priv->lock, flags); 2914 if (cm_id->state == IB_CM_IDLE) 2915 ret = ib_post_send_mad(msg, NULL); 2916 else 2917 ret = -EINVAL; 2918 2919 if (ret) { 2920 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2921 cm_free_msg(msg); 2922 goto out; 2923 } 2924 cm_id->state = IB_CM_SIDR_REQ_SENT; 2925 cm_id_priv->msg = msg; 2926 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2927out: 2928 return ret; 2929} 2930EXPORT_SYMBOL(ib_send_cm_sidr_req); 2931 2932static void cm_format_sidr_req_event(struct cm_work *work, 2933 struct ib_cm_id *listen_id) 2934{ 2935 struct cm_sidr_req_msg *sidr_req_msg; 2936 struct ib_cm_sidr_req_event_param *param; 2937 2938 sidr_req_msg = (struct cm_sidr_req_msg *) 2939 work->mad_recv_wc->recv_buf.mad; 2940 param = &work->cm_event.param.sidr_req_rcvd; 2941 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2942 param->listen_id = listen_id; 2943 param->port = work->port->port_num; 2944 work->cm_event.private_data = &sidr_req_msg->private_data; 2945} 2946 2947static int cm_sidr_req_handler(struct cm_work *work) 2948{ 2949 struct ib_cm_id *cm_id; 2950 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2951 struct cm_sidr_req_msg *sidr_req_msg; 2952 struct ib_wc *wc; 2953 2954 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 2955 if (IS_ERR(cm_id)) 2956 return PTR_ERR(cm_id); 2957 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2958 2959 /* Record SGID/SLID and request ID for lookup. */ 2960 sidr_req_msg = (struct cm_sidr_req_msg *) 2961 work->mad_recv_wc->recv_buf.mad; 2962 wc = work->mad_recv_wc->wc; 2963 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2964 cm_id_priv->av.dgid.global.interface_id = 0; 2965 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2966 work->mad_recv_wc->recv_buf.grh, 2967 &cm_id_priv->av); 2968 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2969 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2970 atomic_inc(&cm_id_priv->work_count); 2971 2972 spin_lock_irq(&cm.lock); 2973 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2974 if (cur_cm_id_priv) { 2975 spin_unlock_irq(&cm.lock); 2976 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2977 counter[CM_SIDR_REQ_COUNTER]); 2978 goto out; /* Duplicate message. */ 2979 } 2980 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2981 cur_cm_id_priv = cm_find_listen(cm_id->device, 2982 sidr_req_msg->service_id, 2983 sidr_req_msg->private_data); 2984 if (!cur_cm_id_priv) { 2985 spin_unlock_irq(&cm.lock); 2986 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 2987 goto out; /* No match. */ 2988 } 2989 atomic_inc(&cur_cm_id_priv->refcount); 2990 spin_unlock_irq(&cm.lock); 2991 2992 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2993 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2994 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2995 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 2996 2997 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2998 cm_process_work(cm_id_priv, work); 2999 cm_deref_id(cur_cm_id_priv); 3000 return 0; 3001out: 3002 ib_destroy_cm_id(&cm_id_priv->id); 3003 return -EINVAL; 3004} 3005 3006static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3007 struct cm_id_private *cm_id_priv, 3008 struct ib_cm_sidr_rep_param *param) 3009{ 3010 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3011 cm_id_priv->tid); 3012 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3013 sidr_rep_msg->status = param->status; 3014 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3015 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3016 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3017 3018 if (param->info && param->info_length) 3019 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3020 3021 if (param->private_data && param->private_data_len) 3022 memcpy(sidr_rep_msg->private_data, param->private_data, 3023 param->private_data_len); 3024} 3025 3026int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3027 struct ib_cm_sidr_rep_param *param) 3028{ 3029 struct cm_id_private *cm_id_priv; 3030 struct ib_mad_send_buf *msg; 3031 unsigned long flags; 3032 int ret; 3033 3034 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3035 (param->private_data && 3036 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3037 return -EINVAL; 3038 3039 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3040 spin_lock_irqsave(&cm_id_priv->lock, flags); 3041 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3042 ret = -EINVAL; 3043 goto error; 3044 } 3045 3046 ret = cm_alloc_msg(cm_id_priv, &msg); 3047 if (ret) 3048 goto error; 3049 3050 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3051 param); 3052 ret = ib_post_send_mad(msg, NULL); 3053 if (ret) { 3054 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3055 cm_free_msg(msg); 3056 return ret; 3057 } 3058 cm_id->state = IB_CM_IDLE; 3059 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3060 3061 spin_lock_irqsave(&cm.lock, flags); 3062 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3063 spin_unlock_irqrestore(&cm.lock, flags); 3064 return 0; 3065 3066error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3067 return ret; 3068} 3069EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3070 3071static void cm_format_sidr_rep_event(struct cm_work *work) 3072{ 3073 struct cm_sidr_rep_msg *sidr_rep_msg; 3074 struct ib_cm_sidr_rep_event_param *param; 3075 3076 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3077 work->mad_recv_wc->recv_buf.mad; 3078 param = &work->cm_event.param.sidr_rep_rcvd; 3079 param->status = sidr_rep_msg->status; 3080 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3081 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3082 param->info = &sidr_rep_msg->info; 3083 param->info_len = sidr_rep_msg->info_length; 3084 work->cm_event.private_data = &sidr_rep_msg->private_data; 3085} 3086 3087static int cm_sidr_rep_handler(struct cm_work *work) 3088{ 3089 struct cm_sidr_rep_msg *sidr_rep_msg; 3090 struct cm_id_private *cm_id_priv; 3091 3092 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3093 work->mad_recv_wc->recv_buf.mad; 3094 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3095 if (!cm_id_priv) 3096 return -EINVAL; /* Unmatched reply. */ 3097 3098 spin_lock_irq(&cm_id_priv->lock); 3099 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3100 spin_unlock_irq(&cm_id_priv->lock); 3101 goto out; 3102 } 3103 cm_id_priv->id.state = IB_CM_IDLE; 3104 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3105 spin_unlock_irq(&cm_id_priv->lock); 3106 3107 cm_format_sidr_rep_event(work); 3108 cm_process_work(cm_id_priv, work); 3109 return 0; 3110out: 3111 cm_deref_id(cm_id_priv); 3112 return -EINVAL; 3113} 3114 3115static void cm_process_send_error(struct ib_mad_send_buf *msg, 3116 enum ib_wc_status wc_status) 3117{ 3118 struct cm_id_private *cm_id_priv; 3119 struct ib_cm_event cm_event; 3120 enum ib_cm_state state; 3121 int ret; 3122 3123 memset(&cm_event, 0, sizeof cm_event); 3124 cm_id_priv = msg->context[0]; 3125 3126 /* Discard old sends or ones without a response. */ 3127 spin_lock_irq(&cm_id_priv->lock); 3128 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3129 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3130 goto discard; 3131 3132 switch (state) { 3133 case IB_CM_REQ_SENT: 3134 case IB_CM_MRA_REQ_RCVD: 3135 cm_reset_to_idle(cm_id_priv); 3136 cm_event.event = IB_CM_REQ_ERROR; 3137 break; 3138 case IB_CM_REP_SENT: 3139 case IB_CM_MRA_REP_RCVD: 3140 cm_reset_to_idle(cm_id_priv); 3141 cm_event.event = IB_CM_REP_ERROR; 3142 break; 3143 case IB_CM_DREQ_SENT: 3144 cm_enter_timewait(cm_id_priv); 3145 cm_event.event = IB_CM_DREQ_ERROR; 3146 break; 3147 case IB_CM_SIDR_REQ_SENT: 3148 cm_id_priv->id.state = IB_CM_IDLE; 3149 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3150 break; 3151 default: 3152 goto discard; 3153 } 3154 spin_unlock_irq(&cm_id_priv->lock); 3155 cm_event.param.send_status = wc_status; 3156 3157 /* No other events can occur on the cm_id at this point. */ 3158 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3159 cm_free_msg(msg); 3160 if (ret) 3161 ib_destroy_cm_id(&cm_id_priv->id); 3162 return; 3163discard: 3164 spin_unlock_irq(&cm_id_priv->lock); 3165 cm_free_msg(msg); 3166} 3167 3168static void cm_send_handler(struct ib_mad_agent *mad_agent, 3169 struct ib_mad_send_wc *mad_send_wc) 3170{ 3171 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3172 struct cm_port *port; 3173 u16 attr_index; 3174 3175 port = mad_agent->context; 3176 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3177 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3178 3179 /* 3180 * If the send was in response to a received message (context[0] is not 3181 * set to a cm_id), and is not a REJ, then it is a send that was 3182 * manually retried. 3183 */ 3184 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3185 msg->retries = 1; 3186 3187 atomic_long_add(1 + msg->retries, 3188 &port->counter_group[CM_XMIT].counter[attr_index]); 3189 if (msg->retries) 3190 atomic_long_add(msg->retries, 3191 &port->counter_group[CM_XMIT_RETRIES]. 3192 counter[attr_index]); 3193 3194 switch (mad_send_wc->status) { 3195 case IB_WC_SUCCESS: 3196 case IB_WC_WR_FLUSH_ERR: 3197 cm_free_msg(msg); 3198 break; 3199 default: 3200 if (msg->context[0] && msg->context[1]) 3201 cm_process_send_error(msg, mad_send_wc->status); 3202 else 3203 cm_free_msg(msg); 3204 break; 3205 } 3206} 3207 3208static void cm_work_handler(struct work_struct *_work) 3209{ 3210 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3211 int ret; 3212 3213 switch (work->cm_event.event) { 3214 case IB_CM_REQ_RECEIVED: 3215 ret = cm_req_handler(work); 3216 break; 3217 case IB_CM_MRA_RECEIVED: 3218 ret = cm_mra_handler(work); 3219 break; 3220 case IB_CM_REJ_RECEIVED: 3221 ret = cm_rej_handler(work); 3222 break; 3223 case IB_CM_REP_RECEIVED: 3224 ret = cm_rep_handler(work); 3225 break; 3226 case IB_CM_RTU_RECEIVED: 3227 ret = cm_rtu_handler(work); 3228 break; 3229 case IB_CM_USER_ESTABLISHED: 3230 ret = cm_establish_handler(work); 3231 break; 3232 case IB_CM_DREQ_RECEIVED: 3233 ret = cm_dreq_handler(work); 3234 break; 3235 case IB_CM_DREP_RECEIVED: 3236 ret = cm_drep_handler(work); 3237 break; 3238 case IB_CM_SIDR_REQ_RECEIVED: 3239 ret = cm_sidr_req_handler(work); 3240 break; 3241 case IB_CM_SIDR_REP_RECEIVED: 3242 ret = cm_sidr_rep_handler(work); 3243 break; 3244 case IB_CM_LAP_RECEIVED: 3245 ret = cm_lap_handler(work); 3246 break; 3247 case IB_CM_APR_RECEIVED: 3248 ret = cm_apr_handler(work); 3249 break; 3250 case IB_CM_TIMEWAIT_EXIT: 3251 ret = cm_timewait_handler(work); 3252 break; 3253 default: 3254 ret = -EINVAL; 3255 break; 3256 } 3257 if (ret) 3258 cm_free_work(work); 3259} 3260 3261static int cm_establish(struct ib_cm_id *cm_id) 3262{ 3263 struct cm_id_private *cm_id_priv; 3264 struct cm_work *work; 3265 unsigned long flags; 3266 int ret = 0; 3267 3268 work = kmalloc(sizeof *work, GFP_ATOMIC); 3269 if (!work) 3270 return -ENOMEM; 3271 3272 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3273 spin_lock_irqsave(&cm_id_priv->lock, flags); 3274 switch (cm_id->state) 3275 { 3276 case IB_CM_REP_SENT: 3277 case IB_CM_MRA_REP_RCVD: 3278 cm_id->state = IB_CM_ESTABLISHED; 3279 break; 3280 case IB_CM_ESTABLISHED: 3281 ret = -EISCONN; 3282 break; 3283 default: 3284 ret = -EINVAL; 3285 break; 3286 } 3287 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3288 3289 if (ret) { 3290 kfree(work); 3291 goto out; 3292 } 3293 3294 /* 3295 * The CM worker thread may try to destroy the cm_id before it 3296 * can execute this work item. To prevent potential deadlock, 3297 * we need to find the cm_id once we're in the context of the 3298 * worker thread, rather than holding a reference on it. 3299 */ 3300 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3301 work->local_id = cm_id->local_id; 3302 work->remote_id = cm_id->remote_id; 3303 work->mad_recv_wc = NULL; 3304 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3305 queue_delayed_work(cm.wq, &work->work, 0); 3306out: 3307 return ret; 3308} 3309 3310static int cm_migrate(struct ib_cm_id *cm_id) 3311{ 3312 struct cm_id_private *cm_id_priv; 3313 unsigned long flags; 3314 int ret = 0; 3315 3316 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3317 spin_lock_irqsave(&cm_id_priv->lock, flags); 3318 if (cm_id->state == IB_CM_ESTABLISHED && 3319 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3320 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3321 cm_id->lap_state = IB_CM_LAP_IDLE; 3322 cm_id_priv->av = cm_id_priv->alt_av; 3323 } else 3324 ret = -EINVAL; 3325 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3326 3327 return ret; 3328} 3329 3330int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3331{ 3332 int ret; 3333 3334 switch (event) { 3335 case IB_EVENT_COMM_EST: 3336 ret = cm_establish(cm_id); 3337 break; 3338 case IB_EVENT_PATH_MIG: 3339 ret = cm_migrate(cm_id); 3340 break; 3341 default: 3342 ret = -EINVAL; 3343 } 3344 return ret; 3345} 3346EXPORT_SYMBOL(ib_cm_notify); 3347 3348static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3349 struct ib_mad_recv_wc *mad_recv_wc) 3350{ 3351 struct cm_port *port = mad_agent->context; 3352 struct cm_work *work; 3353 enum ib_cm_event_type event; 3354 u16 attr_id; 3355 int paths = 0; 3356 3357 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3358 case CM_REQ_ATTR_ID: 3359 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3360 alt_local_lid != 0); 3361 event = IB_CM_REQ_RECEIVED; 3362 break; 3363 case CM_MRA_ATTR_ID: 3364 event = IB_CM_MRA_RECEIVED; 3365 break; 3366 case CM_REJ_ATTR_ID: 3367 event = IB_CM_REJ_RECEIVED; 3368 break; 3369 case CM_REP_ATTR_ID: 3370 event = IB_CM_REP_RECEIVED; 3371 break; 3372 case CM_RTU_ATTR_ID: 3373 event = IB_CM_RTU_RECEIVED; 3374 break; 3375 case CM_DREQ_ATTR_ID: 3376 event = IB_CM_DREQ_RECEIVED; 3377 break; 3378 case CM_DREP_ATTR_ID: 3379 event = IB_CM_DREP_RECEIVED; 3380 break; 3381 case CM_SIDR_REQ_ATTR_ID: 3382 event = IB_CM_SIDR_REQ_RECEIVED; 3383 break; 3384 case CM_SIDR_REP_ATTR_ID: 3385 event = IB_CM_SIDR_REP_RECEIVED; 3386 break; 3387 case CM_LAP_ATTR_ID: 3388 paths = 1; 3389 event = IB_CM_LAP_RECEIVED; 3390 break; 3391 case CM_APR_ATTR_ID: 3392 event = IB_CM_APR_RECEIVED; 3393 break; 3394 default: 3395 ib_free_recv_mad(mad_recv_wc); 3396 return; 3397 } 3398 3399 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3400 atomic_long_inc(&port->counter_group[CM_RECV]. 3401 counter[attr_id - CM_ATTR_ID_OFFSET]); 3402 3403 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3404 GFP_KERNEL); 3405 if (!work) { 3406 ib_free_recv_mad(mad_recv_wc); 3407 return; 3408 } 3409 3410 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3411 work->cm_event.event = event; 3412 work->mad_recv_wc = mad_recv_wc; 3413 work->port = port; 3414 queue_delayed_work(cm.wq, &work->work, 0); 3415} 3416 3417static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3418 struct ib_qp_attr *qp_attr, 3419 int *qp_attr_mask) 3420{ 3421 unsigned long flags; 3422 int ret; 3423 3424 spin_lock_irqsave(&cm_id_priv->lock, flags); 3425 switch (cm_id_priv->id.state) { 3426 case IB_CM_REQ_SENT: 3427 case IB_CM_MRA_REQ_RCVD: 3428 case IB_CM_REQ_RCVD: 3429 case IB_CM_MRA_REQ_SENT: 3430 case IB_CM_REP_RCVD: 3431 case IB_CM_MRA_REP_SENT: 3432 case IB_CM_REP_SENT: 3433 case IB_CM_MRA_REP_RCVD: 3434 case IB_CM_ESTABLISHED: 3435 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3436 IB_QP_PKEY_INDEX | IB_QP_PORT; 3437 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3438 if (cm_id_priv->responder_resources) 3439 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3440 IB_ACCESS_REMOTE_ATOMIC; 3441 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3442 qp_attr->port_num = cm_id_priv->av.port->port_num; 3443 ret = 0; 3444 break; 3445 default: 3446 ret = -EINVAL; 3447 break; 3448 } 3449 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3450 return ret; 3451} 3452 3453static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3454 struct ib_qp_attr *qp_attr, 3455 int *qp_attr_mask) 3456{ 3457 unsigned long flags; 3458 int ret; 3459 3460 spin_lock_irqsave(&cm_id_priv->lock, flags); 3461 switch (cm_id_priv->id.state) { 3462 case IB_CM_REQ_RCVD: 3463 case IB_CM_MRA_REQ_SENT: 3464 case IB_CM_REP_RCVD: 3465 case IB_CM_MRA_REP_SENT: 3466 case IB_CM_REP_SENT: 3467 case IB_CM_MRA_REP_RCVD: 3468 case IB_CM_ESTABLISHED: 3469 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3470 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3471 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3472 qp_attr->path_mtu = cm_id_priv->path_mtu; 3473 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3474 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3475 if (cm_id_priv->qp_type == IB_QPT_RC) { 3476 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3477 IB_QP_MIN_RNR_TIMER; 3478 qp_attr->max_dest_rd_atomic = 3479 cm_id_priv->responder_resources; 3480 qp_attr->min_rnr_timer = 0; 3481 } 3482 if (cm_id_priv->alt_av.ah_attr.dlid) { 3483 *qp_attr_mask |= IB_QP_ALT_PATH; 3484 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3485 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3486 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3487 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3488 } 3489 ret = 0; 3490 break; 3491 default: 3492 ret = -EINVAL; 3493 break; 3494 } 3495 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3496 return ret; 3497} 3498 3499static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3500 struct ib_qp_attr *qp_attr, 3501 int *qp_attr_mask) 3502{ 3503 unsigned long flags; 3504 int ret; 3505 3506 spin_lock_irqsave(&cm_id_priv->lock, flags); 3507 switch (cm_id_priv->id.state) { 3508 /* Allow transition to RTS before sending REP */ 3509 case IB_CM_REQ_RCVD: 3510 case IB_CM_MRA_REQ_SENT: 3511 3512 case IB_CM_REP_RCVD: 3513 case IB_CM_MRA_REP_SENT: 3514 case IB_CM_REP_SENT: 3515 case IB_CM_MRA_REP_RCVD: 3516 case IB_CM_ESTABLISHED: 3517 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3518 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3519 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3520 if (cm_id_priv->qp_type == IB_QPT_RC) { 3521 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3522 IB_QP_RNR_RETRY | 3523 IB_QP_MAX_QP_RD_ATOMIC; 3524 qp_attr->timeout = cm_id_priv->av.timeout; 3525 qp_attr->retry_cnt = cm_id_priv->retry_count; 3526 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3527 qp_attr->max_rd_atomic = 3528 cm_id_priv->initiator_depth; 3529 } 3530 if (cm_id_priv->alt_av.ah_attr.dlid) { 3531 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3532 qp_attr->path_mig_state = IB_MIG_REARM; 3533 } 3534 } else { 3535 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3536 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3537 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3538 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3539 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3540 qp_attr->path_mig_state = IB_MIG_REARM; 3541 } 3542 ret = 0; 3543 break; 3544 default: 3545 ret = -EINVAL; 3546 break; 3547 } 3548 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3549 return ret; 3550} 3551 3552int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3553 struct ib_qp_attr *qp_attr, 3554 int *qp_attr_mask) 3555{ 3556 struct cm_id_private *cm_id_priv; 3557 int ret; 3558 3559 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3560 switch (qp_attr->qp_state) { 3561 case IB_QPS_INIT: 3562 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3563 break; 3564 case IB_QPS_RTR: 3565 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3566 break; 3567 case IB_QPS_RTS: 3568 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3569 break; 3570 default: 3571 ret = -EINVAL; 3572 break; 3573 } 3574 return ret; 3575} 3576EXPORT_SYMBOL(ib_cm_init_qp_attr); 3577 3578static void cm_get_ack_delay(struct cm_device *cm_dev) 3579{ 3580 struct ib_device_attr attr; 3581 3582 if (ib_query_device(cm_dev->ib_device, &attr)) 3583 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3584 else 3585 cm_dev->ack_delay = attr.local_ca_ack_delay; 3586} 3587 3588static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3589 char *buf) 3590{ 3591 struct cm_counter_group *group; 3592 struct cm_counter_attribute *cm_attr; 3593 3594 group = container_of(obj, struct cm_counter_group, obj); 3595 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3596 3597 return sprintf(buf, "%ld\n", 3598 atomic_long_read(&group->counter[cm_attr->index])); 3599} 3600 3601static const struct sysfs_ops cm_counter_ops = { 3602 .show = cm_show_counter 3603}; 3604 3605static struct kobj_type cm_counter_obj_type = { 3606 .sysfs_ops = &cm_counter_ops, 3607 .default_attrs = cm_counter_default_attrs 3608}; 3609 3610static void cm_release_port_obj(struct kobject *obj) 3611{ 3612 struct cm_port *cm_port; 3613 3614 cm_port = container_of(obj, struct cm_port, port_obj); 3615 kfree(cm_port); 3616} 3617 3618static struct kobj_type cm_port_obj_type = { 3619 .release = cm_release_port_obj 3620}; 3621 3622struct class cm_class = { 3623 .name = "infiniband_cm", 3624}; 3625EXPORT_SYMBOL(cm_class); 3626 3627static int cm_create_port_fs(struct cm_port *port) 3628{ 3629 int i, ret; 3630 3631 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3632 &port->cm_dev->device->kobj, 3633 "%d", port->port_num); 3634 if (ret) { 3635 kfree(port); 3636 return ret; 3637 } 3638 3639 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3640 ret = kobject_init_and_add(&port->counter_group[i].obj, 3641 &cm_counter_obj_type, 3642 &port->port_obj, 3643 "%s", counter_group_names[i]); 3644 if (ret) 3645 goto error; 3646 } 3647 3648 return 0; 3649 3650error: 3651 while (i--) 3652 kobject_put(&port->counter_group[i].obj); 3653 kobject_put(&port->port_obj); 3654 return ret; 3655 3656} 3657 3658static void cm_remove_port_fs(struct cm_port *port) 3659{ 3660 int i; 3661 3662 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3663 kobject_put(&port->counter_group[i].obj); 3664 3665 kobject_put(&port->port_obj); 3666} 3667 3668static void cm_add_one(struct ib_device *ib_device) 3669{ 3670 struct cm_device *cm_dev; 3671 struct cm_port *port; 3672 struct ib_mad_reg_req reg_req = { 3673 .mgmt_class = IB_MGMT_CLASS_CM, 3674 .mgmt_class_version = IB_CM_CLASS_VERSION 3675 }; 3676 struct ib_port_modify port_modify = { 3677 .set_port_cap_mask = IB_PORT_CM_SUP 3678 }; 3679 unsigned long flags; 3680 int ret; 3681 u8 i; 3682 3683 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3684 return; 3685 3686 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3687 ib_device->phys_port_cnt, GFP_KERNEL); 3688 if (!cm_dev) 3689 return; 3690 3691 cm_dev->ib_device = ib_device; 3692 cm_get_ack_delay(cm_dev); 3693 3694 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3695 MKDEV(0, 0), NULL, 3696 "%s", ib_device->name); 3697 if (!cm_dev->device) { 3698 kfree(cm_dev); 3699 return; 3700 } 3701 3702 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3703 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3704 port = kzalloc(sizeof *port, GFP_KERNEL); 3705 if (!port) 3706 goto error1; 3707 3708 cm_dev->port[i-1] = port; 3709 port->cm_dev = cm_dev; 3710 port->port_num = i; 3711 3712 ret = cm_create_port_fs(port); 3713 if (ret) 3714 goto error1; 3715 3716 port->mad_agent = ib_register_mad_agent(ib_device, i, 3717 IB_QPT_GSI, 3718 ®_req, 3719 0, 3720 cm_send_handler, 3721 cm_recv_handler, 3722 port); 3723 if (IS_ERR(port->mad_agent)) 3724 goto error2; 3725 3726 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3727 if (ret) 3728 goto error3; 3729 } 3730 ib_set_client_data(ib_device, &cm_client, cm_dev); 3731 3732 write_lock_irqsave(&cm.device_lock, flags); 3733 list_add_tail(&cm_dev->list, &cm.device_list); 3734 write_unlock_irqrestore(&cm.device_lock, flags); 3735 return; 3736 3737error3: 3738 ib_unregister_mad_agent(port->mad_agent); 3739error2: 3740 cm_remove_port_fs(port); 3741error1: 3742 port_modify.set_port_cap_mask = 0; 3743 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3744 while (--i) { 3745 port = cm_dev->port[i-1]; 3746 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3747 ib_unregister_mad_agent(port->mad_agent); 3748 cm_remove_port_fs(port); 3749 } 3750 device_unregister(cm_dev->device); 3751 kfree(cm_dev); 3752} 3753 3754static void cm_remove_one(struct ib_device *ib_device) 3755{ 3756 struct cm_device *cm_dev; 3757 struct cm_port *port; 3758 struct ib_port_modify port_modify = { 3759 .clr_port_cap_mask = IB_PORT_CM_SUP 3760 }; 3761 unsigned long flags; 3762 int i; 3763 3764 cm_dev = ib_get_client_data(ib_device, &cm_client); 3765 if (!cm_dev) 3766 return; 3767 3768 write_lock_irqsave(&cm.device_lock, flags); 3769 list_del(&cm_dev->list); 3770 write_unlock_irqrestore(&cm.device_lock, flags); 3771 3772 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3773 port = cm_dev->port[i-1]; 3774 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3775 ib_unregister_mad_agent(port->mad_agent); 3776 flush_workqueue(cm.wq); 3777 cm_remove_port_fs(port); 3778 } 3779 device_unregister(cm_dev->device); 3780 kfree(cm_dev); 3781} 3782 3783static int __init ib_cm_init(void) 3784{ 3785 int ret; 3786 3787 memset(&cm, 0, sizeof cm); 3788 INIT_LIST_HEAD(&cm.device_list); 3789 rwlock_init(&cm.device_lock); 3790 spin_lock_init(&cm.lock); 3791 cm.listen_service_table = RB_ROOT; 3792 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3793 cm.remote_id_table = RB_ROOT; 3794 cm.remote_qp_table = RB_ROOT; 3795 cm.remote_sidr_table = RB_ROOT; 3796 idr_init(&cm.local_id_table); 3797 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3798 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3799 INIT_LIST_HEAD(&cm.timewait_list); 3800 3801 ret = class_register(&cm_class); 3802 if (ret) 3803 return -ENOMEM; 3804 3805 cm.wq = create_workqueue("ib_cm"); 3806 if (!cm.wq) { 3807 ret = -ENOMEM; 3808 goto error1; 3809 } 3810 3811 ret = ib_register_client(&cm_client); 3812 if (ret) 3813 goto error2; 3814 3815 return 0; 3816error2: 3817 destroy_workqueue(cm.wq); 3818error1: 3819 class_unregister(&cm_class); 3820 return ret; 3821} 3822 3823static void __exit ib_cm_cleanup(void) 3824{ 3825 struct cm_timewait_info *timewait_info, *tmp; 3826 3827 spin_lock_irq(&cm.lock); 3828 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3829 cancel_delayed_work(&timewait_info->work.work); 3830 spin_unlock_irq(&cm.lock); 3831 3832 ib_unregister_client(&cm_client); 3833 destroy_workqueue(cm.wq); 3834 3835 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3836 list_del(&timewait_info->list); 3837 kfree(timewait_info); 3838 } 3839 3840 class_unregister(&cm_class); 3841 idr_destroy(&cm.local_id_table); 3842} 3843 3844module_init(ib_cm_init); 3845module_exit(ib_cm_cleanup); 3846 3847