1/* 2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. 3 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36#include <linux/completion.h> 37#include <linux/dma-mapping.h> 38#include <linux/device.h> 39#include <linux/err.h> 40#include <linux/idr.h> 41#include <linux/interrupt.h> 42#include <linux/random.h> 43#include <linux/rbtree.h> 44#include <linux/spinlock.h> 45#include <linux/sysfs.h> 46#include <linux/workqueue.h> 47#include <linux/kdev_t.h> 48 49#include <rdma/ib_cache.h> 50#include <rdma/ib_cm.h> 51#include "cm_msgs.h" 52 53MODULE_AUTHOR("Sean Hefty"); 54MODULE_DESCRIPTION("InfiniBand CM"); 55MODULE_LICENSE("Dual BSD/GPL"); 56 57#define PFX "ib_cm: " 58 59/* 60 * Limit CM message timeouts to something reasonable: 61 * 8 seconds per message, with up to 15 retries 62 */ 63static int max_timeout = 21; 64module_param(max_timeout, int, 0644); 65MODULE_PARM_DESC(max_timeout, "Maximum IB CM per message timeout " 66 "(default=21, or ~8 seconds)"); 67 68static void cm_add_one(struct ib_device *device); 69static void cm_remove_one(struct ib_device *device); 70 71static struct ib_client cm_client = { 72 .name = "cm", 73 .add = cm_add_one, 74 .remove = cm_remove_one 75}; 76 77static struct ib_cm { 78 spinlock_t lock; 79 struct list_head device_list; 80 rwlock_t device_lock; 81 struct rb_root listen_service_table; 82 u64 listen_service_id; 83 /* struct rb_root peer_service_table; todo: fix peer to peer */ 84 struct rb_root remote_qp_table; 85 struct rb_root remote_id_table; 86 struct rb_root remote_sidr_table; 87 struct idr local_id_table; 88 __be32 random_id_operand; 89 struct list_head timewait_list; 90 struct workqueue_struct *wq; 91} cm; 92 93/* Counter indexes ordered by attribute ID */ 94enum { 95 CM_REQ_COUNTER, 96 CM_MRA_COUNTER, 97 CM_REJ_COUNTER, 98 CM_REP_COUNTER, 99 CM_RTU_COUNTER, 100 CM_DREQ_COUNTER, 101 CM_DREP_COUNTER, 102 CM_SIDR_REQ_COUNTER, 103 CM_SIDR_REP_COUNTER, 104 CM_LAP_COUNTER, 105 CM_APR_COUNTER, 106 CM_ATTR_COUNT, 107 CM_ATTR_ID_OFFSET = 0x0010, 108}; 109 110enum { 111 CM_XMIT, 112 CM_XMIT_RETRIES, 113 CM_RECV, 114 CM_RECV_DUPLICATES, 115 CM_COUNTER_GROUPS 116}; 117 118static char const counter_group_names[CM_COUNTER_GROUPS] 119 [sizeof("cm_rx_duplicates")] = { 120 "cm_tx_msgs", "cm_tx_retries", 121 "cm_rx_msgs", "cm_rx_duplicates" 122}; 123 124struct cm_counter_group { 125 struct kobject obj; 126 atomic_long_t counter[CM_ATTR_COUNT]; 127}; 128 129struct cm_counter_attribute { 130 struct attribute attr; 131 int index; 132}; 133 134#define CM_COUNTER_ATTR(_name, _index) \ 135struct cm_counter_attribute cm_##_name##_counter_attr = { \ 136 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 137 .index = _index \ 138} 139 140static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 141static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 142static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 143static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 144static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 145static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 146static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 147static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 148static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 149static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 150static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 151 152static struct attribute *cm_counter_default_attrs[] = { 153 &cm_req_counter_attr.attr, 154 &cm_mra_counter_attr.attr, 155 &cm_rej_counter_attr.attr, 156 &cm_rep_counter_attr.attr, 157 &cm_rtu_counter_attr.attr, 158 &cm_dreq_counter_attr.attr, 159 &cm_drep_counter_attr.attr, 160 &cm_sidr_req_counter_attr.attr, 161 &cm_sidr_rep_counter_attr.attr, 162 &cm_lap_counter_attr.attr, 163 &cm_apr_counter_attr.attr, 164 NULL 165}; 166 167struct cm_port { 168 struct cm_device *cm_dev; 169 struct ib_mad_agent *mad_agent; 170 struct kobject port_obj; 171 u8 port_num; 172 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 173}; 174 175struct cm_device { 176 struct list_head list; 177 struct ib_device *ib_device; 178 struct device *device; 179 u8 ack_delay; 180 struct cm_port *port[0]; 181}; 182 183struct cm_av { 184 struct cm_port *port; 185 union ib_gid dgid; 186 struct ib_ah_attr ah_attr; 187 u16 pkey_index; 188 u8 timeout; 189}; 190 191struct cm_work { 192 struct delayed_work work; 193 struct list_head list; 194 struct cm_port *port; 195 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 196 __be32 local_id; /* Established / timewait */ 197 __be32 remote_id; 198 struct ib_cm_event cm_event; 199 struct ib_sa_path_rec path[0]; 200}; 201 202struct cm_timewait_info { 203 struct cm_work work; /* Must be first. */ 204 struct list_head list; 205 struct rb_node remote_qp_node; 206 struct rb_node remote_id_node; 207 __be64 remote_ca_guid; 208 __be32 remote_qpn; 209 u8 inserted_remote_qp; 210 u8 inserted_remote_id; 211}; 212 213struct cm_id_private { 214 struct ib_cm_id id; 215 216 struct rb_node service_node; 217 struct rb_node sidr_id_node; 218 spinlock_t lock; /* Do not acquire inside cm.lock */ 219 struct completion comp; 220 atomic_t refcount; 221 222 struct ib_mad_send_buf *msg; 223 struct cm_timewait_info *timewait_info; 224 /* todo: use alternate port on send failure */ 225 struct cm_av av; 226 struct cm_av alt_av; 227 struct ib_cm_compare_data *compare_data; 228 229 void *private_data; 230 __be64 tid; 231 __be32 local_qpn; 232 __be32 remote_qpn; 233 enum ib_qp_type qp_type; 234 __be32 sq_psn; 235 __be32 rq_psn; 236 int timeout_ms; 237 enum ib_mtu path_mtu; 238 __be16 pkey; 239 u8 private_data_len; 240 u8 max_cm_retries; 241 u8 peer_to_peer; 242 u8 responder_resources; 243 u8 initiator_depth; 244 u8 retry_count; 245 u8 rnr_retry_count; 246 u8 service_timeout; 247 u8 target_ack_delay; 248 249 struct list_head work_list; 250 atomic_t work_count; 251}; 252 253static void cm_work_handler(struct work_struct *work); 254 255static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 256{ 257 if (atomic_dec_and_test(&cm_id_priv->refcount)) 258 complete(&cm_id_priv->comp); 259} 260 261static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 262 struct ib_mad_send_buf **msg) 263{ 264 struct ib_mad_agent *mad_agent; 265 struct ib_mad_send_buf *m; 266 struct ib_ah *ah; 267 268 mad_agent = cm_id_priv->av.port->mad_agent; 269 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 270 if (IS_ERR(ah)) 271 return PTR_ERR(ah); 272 273 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 274 cm_id_priv->av.pkey_index, 275 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 276 GFP_ATOMIC); 277 if (IS_ERR(m)) { 278 ib_destroy_ah(ah); 279 return PTR_ERR(m); 280 } 281 282 /* Timeout set by caller if response is expected. */ 283 m->ah = ah; 284 m->retries = cm_id_priv->max_cm_retries; 285 286 atomic_inc(&cm_id_priv->refcount); 287 m->context[0] = cm_id_priv; 288 *msg = m; 289 return 0; 290} 291 292static int cm_alloc_response_msg(struct cm_port *port, 293 struct ib_mad_recv_wc *mad_recv_wc, 294 struct ib_mad_send_buf **msg) 295{ 296 struct ib_mad_send_buf *m; 297 struct ib_ah *ah; 298 299 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 300 mad_recv_wc->recv_buf.grh, port->port_num); 301 if (IS_ERR(ah)) 302 return PTR_ERR(ah); 303 304 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 305 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 306 GFP_ATOMIC); 307 if (IS_ERR(m)) { 308 ib_destroy_ah(ah); 309 return PTR_ERR(m); 310 } 311 m->ah = ah; 312 *msg = m; 313 return 0; 314} 315 316static void cm_free_msg(struct ib_mad_send_buf *msg) 317{ 318 ib_destroy_ah(msg->ah); 319 if (msg->context[0]) 320 cm_deref_id(msg->context[0]); 321 ib_free_send_mad(msg); 322} 323 324static void * cm_copy_private_data(const void *private_data, 325 u8 private_data_len) 326{ 327 void *data; 328 329 if (!private_data || !private_data_len) 330 return NULL; 331 332 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 333 if (!data) 334 return ERR_PTR(-ENOMEM); 335 336 return data; 337} 338 339static void cm_set_private_data(struct cm_id_private *cm_id_priv, 340 void *private_data, u8 private_data_len) 341{ 342 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 343 kfree(cm_id_priv->private_data); 344 345 cm_id_priv->private_data = private_data; 346 cm_id_priv->private_data_len = private_data_len; 347} 348 349static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 350 struct ib_grh *grh, struct cm_av *av) 351{ 352 av->port = port; 353 av->pkey_index = wc->pkey_index; 354 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 355 grh, &av->ah_attr); 356} 357 358static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 359{ 360 struct cm_device *cm_dev; 361 struct cm_port *port = NULL; 362 unsigned long flags; 363 int ret; 364 u8 p; 365 366 read_lock_irqsave(&cm.device_lock, flags); 367 list_for_each_entry(cm_dev, &cm.device_list, list) { 368 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 369 &p, NULL)) { 370 port = cm_dev->port[p-1]; 371 break; 372 } 373 } 374 read_unlock_irqrestore(&cm.device_lock, flags); 375 376 if (!port) 377 return -EINVAL; 378 379 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 380 be16_to_cpu(path->pkey), &av->pkey_index); 381 if (ret) 382 return ret; 383 384 av->port = port; 385 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path, 386 &av->ah_attr); 387 av->timeout = path->packet_life_time + 1; 388 return 0; 389} 390 391static int cm_alloc_id(struct cm_id_private *cm_id_priv) 392{ 393 unsigned long flags; 394 int ret, id; 395 static int next_id; 396 397 do { 398 spin_lock_irqsave(&cm.lock, flags); 399 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 400 next_id, &id); 401 if (!ret) 402 next_id = ((unsigned) id + 1) & MAX_ID_MASK; 403 spin_unlock_irqrestore(&cm.lock, flags); 404 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 405 406 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 407 return ret; 408} 409 410static void cm_free_id(__be32 local_id) 411{ 412 spin_lock_irq(&cm.lock); 413 idr_remove(&cm.local_id_table, 414 (__force int) (local_id ^ cm.random_id_operand)); 415 spin_unlock_irq(&cm.lock); 416} 417 418static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 419{ 420 struct cm_id_private *cm_id_priv; 421 422 cm_id_priv = idr_find(&cm.local_id_table, 423 (__force int) (local_id ^ cm.random_id_operand)); 424 if (cm_id_priv) { 425 if (cm_id_priv->id.remote_id == remote_id) 426 atomic_inc(&cm_id_priv->refcount); 427 else 428 cm_id_priv = NULL; 429 } 430 431 return cm_id_priv; 432} 433 434static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 435{ 436 struct cm_id_private *cm_id_priv; 437 438 spin_lock_irq(&cm.lock); 439 cm_id_priv = cm_get_id(local_id, remote_id); 440 spin_unlock_irq(&cm.lock); 441 442 return cm_id_priv; 443} 444 445static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 446{ 447 int i; 448 449 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 450 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 451 ((unsigned long *) mask)[i]; 452} 453 454static int cm_compare_data(struct ib_cm_compare_data *src_data, 455 struct ib_cm_compare_data *dst_data) 456{ 457 u8 src[IB_CM_COMPARE_SIZE]; 458 u8 dst[IB_CM_COMPARE_SIZE]; 459 460 if (!src_data || !dst_data) 461 return 0; 462 463 cm_mask_copy(src, src_data->data, dst_data->mask); 464 cm_mask_copy(dst, dst_data->data, src_data->mask); 465 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 466} 467 468static int cm_compare_private_data(u8 *private_data, 469 struct ib_cm_compare_data *dst_data) 470{ 471 u8 src[IB_CM_COMPARE_SIZE]; 472 473 if (!dst_data) 474 return 0; 475 476 cm_mask_copy(src, private_data, dst_data->mask); 477 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 478} 479 480/* 481 * Trivial helpers to strip endian annotation and compare; the 482 * endianness doesn't actually matter since we just need a stable 483 * order for the RB tree. 484 */ 485static int be32_lt(__be32 a, __be32 b) 486{ 487 return (__force u32) a < (__force u32) b; 488} 489 490static int be32_gt(__be32 a, __be32 b) 491{ 492 return (__force u32) a > (__force u32) b; 493} 494 495static int be64_lt(__be64 a, __be64 b) 496{ 497 return (__force u64) a < (__force u64) b; 498} 499 500static int be64_gt(__be64 a, __be64 b) 501{ 502 return (__force u64) a > (__force u64) b; 503} 504 505static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 506{ 507 struct rb_node **link = &cm.listen_service_table.rb_node; 508 struct rb_node *parent = NULL; 509 struct cm_id_private *cur_cm_id_priv; 510 __be64 service_id = cm_id_priv->id.service_id; 511 __be64 service_mask = cm_id_priv->id.service_mask; 512 int data_cmp; 513 514 while (*link) { 515 parent = *link; 516 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 517 service_node); 518 data_cmp = cm_compare_data(cm_id_priv->compare_data, 519 cur_cm_id_priv->compare_data); 520 if ((cur_cm_id_priv->id.service_mask & service_id) == 521 (service_mask & cur_cm_id_priv->id.service_id) && 522 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 523 !data_cmp) 524 return cur_cm_id_priv; 525 526 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 527 link = &(*link)->rb_left; 528 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 529 link = &(*link)->rb_right; 530 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 531 link = &(*link)->rb_left; 532 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 533 link = &(*link)->rb_right; 534 else if (data_cmp < 0) 535 link = &(*link)->rb_left; 536 else 537 link = &(*link)->rb_right; 538 } 539 rb_link_node(&cm_id_priv->service_node, parent, link); 540 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 541 return NULL; 542} 543 544static struct cm_id_private * cm_find_listen(struct ib_device *device, 545 __be64 service_id, 546 u8 *private_data) 547{ 548 struct rb_node *node = cm.listen_service_table.rb_node; 549 struct cm_id_private *cm_id_priv; 550 int data_cmp; 551 552 while (node) { 553 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 554 data_cmp = cm_compare_private_data(private_data, 555 cm_id_priv->compare_data); 556 if ((cm_id_priv->id.service_mask & service_id) == 557 cm_id_priv->id.service_id && 558 (cm_id_priv->id.device == device) && !data_cmp) 559 return cm_id_priv; 560 561 if (device < cm_id_priv->id.device) 562 node = node->rb_left; 563 else if (device > cm_id_priv->id.device) 564 node = node->rb_right; 565 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 566 node = node->rb_left; 567 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 568 node = node->rb_right; 569 else if (data_cmp < 0) 570 node = node->rb_left; 571 else 572 node = node->rb_right; 573 } 574 return NULL; 575} 576 577static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 578 *timewait_info) 579{ 580 struct rb_node **link = &cm.remote_id_table.rb_node; 581 struct rb_node *parent = NULL; 582 struct cm_timewait_info *cur_timewait_info; 583 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 584 __be32 remote_id = timewait_info->work.remote_id; 585 586 while (*link) { 587 parent = *link; 588 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 589 remote_id_node); 590 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 591 link = &(*link)->rb_left; 592 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 593 link = &(*link)->rb_right; 594 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 595 link = &(*link)->rb_left; 596 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 597 link = &(*link)->rb_right; 598 else 599 return cur_timewait_info; 600 } 601 timewait_info->inserted_remote_id = 1; 602 rb_link_node(&timewait_info->remote_id_node, parent, link); 603 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 604 return NULL; 605} 606 607static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 608 __be32 remote_id) 609{ 610 struct rb_node *node = cm.remote_id_table.rb_node; 611 struct cm_timewait_info *timewait_info; 612 613 while (node) { 614 timewait_info = rb_entry(node, struct cm_timewait_info, 615 remote_id_node); 616 if (be32_lt(remote_id, timewait_info->work.remote_id)) 617 node = node->rb_left; 618 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 619 node = node->rb_right; 620 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 621 node = node->rb_left; 622 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 623 node = node->rb_right; 624 else 625 return timewait_info; 626 } 627 return NULL; 628} 629 630static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 631 *timewait_info) 632{ 633 struct rb_node **link = &cm.remote_qp_table.rb_node; 634 struct rb_node *parent = NULL; 635 struct cm_timewait_info *cur_timewait_info; 636 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 637 __be32 remote_qpn = timewait_info->remote_qpn; 638 639 while (*link) { 640 parent = *link; 641 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 642 remote_qp_node); 643 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 644 link = &(*link)->rb_left; 645 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 646 link = &(*link)->rb_right; 647 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 648 link = &(*link)->rb_left; 649 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 650 link = &(*link)->rb_right; 651 else 652 return cur_timewait_info; 653 } 654 timewait_info->inserted_remote_qp = 1; 655 rb_link_node(&timewait_info->remote_qp_node, parent, link); 656 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 657 return NULL; 658} 659 660static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 661 *cm_id_priv) 662{ 663 struct rb_node **link = &cm.remote_sidr_table.rb_node; 664 struct rb_node *parent = NULL; 665 struct cm_id_private *cur_cm_id_priv; 666 union ib_gid *port_gid = &cm_id_priv->av.dgid; 667 __be32 remote_id = cm_id_priv->id.remote_id; 668 669 while (*link) { 670 parent = *link; 671 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 672 sidr_id_node); 673 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 674 link = &(*link)->rb_left; 675 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 676 link = &(*link)->rb_right; 677 else { 678 int cmp; 679 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 680 sizeof *port_gid); 681 if (cmp < 0) 682 link = &(*link)->rb_left; 683 else if (cmp > 0) 684 link = &(*link)->rb_right; 685 else 686 return cur_cm_id_priv; 687 } 688 } 689 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 690 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 691 return NULL; 692} 693 694static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 695 enum ib_cm_sidr_status status) 696{ 697 struct ib_cm_sidr_rep_param param; 698 699 memset(¶m, 0, sizeof param); 700 param.status = status; 701 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 702} 703 704struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 705 ib_cm_handler cm_handler, 706 void *context) 707{ 708 struct cm_id_private *cm_id_priv; 709 int ret; 710 711 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 712 if (!cm_id_priv) 713 return ERR_PTR(-ENOMEM); 714 715 cm_id_priv->id.state = IB_CM_IDLE; 716 cm_id_priv->id.device = device; 717 cm_id_priv->id.cm_handler = cm_handler; 718 cm_id_priv->id.context = context; 719 cm_id_priv->id.remote_cm_qpn = 1; 720 ret = cm_alloc_id(cm_id_priv); 721 if (ret) 722 goto error; 723 724 spin_lock_init(&cm_id_priv->lock); 725 init_completion(&cm_id_priv->comp); 726 INIT_LIST_HEAD(&cm_id_priv->work_list); 727 atomic_set(&cm_id_priv->work_count, -1); 728 atomic_set(&cm_id_priv->refcount, 1); 729 return &cm_id_priv->id; 730 731error: 732 kfree(cm_id_priv); 733 return ERR_PTR(-ENOMEM); 734} 735EXPORT_SYMBOL(ib_create_cm_id); 736 737static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 738{ 739 struct cm_work *work; 740 741 if (list_empty(&cm_id_priv->work_list)) 742 return NULL; 743 744 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 745 list_del(&work->list); 746 return work; 747} 748 749static void cm_free_work(struct cm_work *work) 750{ 751 if (work->mad_recv_wc) 752 ib_free_recv_mad(work->mad_recv_wc); 753 kfree(work); 754} 755 756static inline int cm_convert_to_ms(int iba_time) 757{ 758 /* approximate conversion to ms from 4.096us x 2^iba_time */ 759 return 1 << max(iba_time - 8, 0); 760} 761 762/* 763 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 764 * Because of how ack_timeout is stored, adding one doubles the timeout. 765 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 766 * increment it (round up) only if the other is within 50%. 767 */ 768static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 769{ 770 int ack_timeout = packet_life_time + 1; 771 772 if (ack_timeout >= ca_ack_delay) 773 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 774 else 775 ack_timeout = ca_ack_delay + 776 (ack_timeout >= (ca_ack_delay - 1)); 777 778 return min(31, ack_timeout); 779} 780 781static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 782{ 783 if (timewait_info->inserted_remote_id) { 784 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 785 timewait_info->inserted_remote_id = 0; 786 } 787 788 if (timewait_info->inserted_remote_qp) { 789 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 790 timewait_info->inserted_remote_qp = 0; 791 } 792} 793 794static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 795{ 796 struct cm_timewait_info *timewait_info; 797 798 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 799 if (!timewait_info) 800 return ERR_PTR(-ENOMEM); 801 802 timewait_info->work.local_id = local_id; 803 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 804 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 805 return timewait_info; 806} 807 808static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 809{ 810 int wait_time; 811 unsigned long flags; 812 813 spin_lock_irqsave(&cm.lock, flags); 814 cm_cleanup_timewait(cm_id_priv->timewait_info); 815 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 816 spin_unlock_irqrestore(&cm.lock, flags); 817 818 /* 819 * The cm_id could be destroyed by the user before we exit timewait. 820 * To protect against this, we search for the cm_id after exiting 821 * timewait before notifying the user that we've exited timewait. 822 */ 823 cm_id_priv->id.state = IB_CM_TIMEWAIT; 824 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 825 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 826 msecs_to_jiffies(wait_time)); 827 cm_id_priv->timewait_info = NULL; 828} 829 830static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 831{ 832 unsigned long flags; 833 834 cm_id_priv->id.state = IB_CM_IDLE; 835 if (cm_id_priv->timewait_info) { 836 spin_lock_irqsave(&cm.lock, flags); 837 cm_cleanup_timewait(cm_id_priv->timewait_info); 838 spin_unlock_irqrestore(&cm.lock, flags); 839 kfree(cm_id_priv->timewait_info); 840 cm_id_priv->timewait_info = NULL; 841 } 842} 843 844static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 845{ 846 struct cm_id_private *cm_id_priv; 847 struct cm_work *work; 848 849 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 850retest: 851 spin_lock_irq(&cm_id_priv->lock); 852 switch (cm_id->state) { 853 case IB_CM_LISTEN: 854 cm_id->state = IB_CM_IDLE; 855 spin_unlock_irq(&cm_id_priv->lock); 856 spin_lock_irq(&cm.lock); 857 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 858 spin_unlock_irq(&cm.lock); 859 break; 860 case IB_CM_SIDR_REQ_SENT: 861 cm_id->state = IB_CM_IDLE; 862 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 863 spin_unlock_irq(&cm_id_priv->lock); 864 break; 865 case IB_CM_SIDR_REQ_RCVD: 866 spin_unlock_irq(&cm_id_priv->lock); 867 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 868 break; 869 case IB_CM_REQ_SENT: 870 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 871 spin_unlock_irq(&cm_id_priv->lock); 872 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 873 &cm_id_priv->id.device->node_guid, 874 sizeof cm_id_priv->id.device->node_guid, 875 NULL, 0); 876 break; 877 case IB_CM_REQ_RCVD: 878 if (err == -ENOMEM) { 879 /* Do not reject to allow future retries. */ 880 cm_reset_to_idle(cm_id_priv); 881 spin_unlock_irq(&cm_id_priv->lock); 882 } else { 883 spin_unlock_irq(&cm_id_priv->lock); 884 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 885 NULL, 0, NULL, 0); 886 } 887 break; 888 case IB_CM_MRA_REQ_RCVD: 889 case IB_CM_REP_SENT: 890 case IB_CM_MRA_REP_RCVD: 891 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 892 /* Fall through */ 893 case IB_CM_MRA_REQ_SENT: 894 case IB_CM_REP_RCVD: 895 case IB_CM_MRA_REP_SENT: 896 spin_unlock_irq(&cm_id_priv->lock); 897 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 898 NULL, 0, NULL, 0); 899 break; 900 case IB_CM_ESTABLISHED: 901 spin_unlock_irq(&cm_id_priv->lock); 902 ib_send_cm_dreq(cm_id, NULL, 0); 903 goto retest; 904 case IB_CM_DREQ_SENT: 905 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 906 cm_enter_timewait(cm_id_priv); 907 spin_unlock_irq(&cm_id_priv->lock); 908 break; 909 case IB_CM_DREQ_RCVD: 910 spin_unlock_irq(&cm_id_priv->lock); 911 ib_send_cm_drep(cm_id, NULL, 0); 912 break; 913 default: 914 spin_unlock_irq(&cm_id_priv->lock); 915 break; 916 } 917 918 cm_free_id(cm_id->local_id); 919 cm_deref_id(cm_id_priv); 920 wait_for_completion(&cm_id_priv->comp); 921 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 922 cm_free_work(work); 923 kfree(cm_id_priv->compare_data); 924 kfree(cm_id_priv->private_data); 925 kfree(cm_id_priv); 926} 927 928void ib_destroy_cm_id(struct ib_cm_id *cm_id) 929{ 930 cm_destroy_id(cm_id, 0); 931} 932EXPORT_SYMBOL(ib_destroy_cm_id); 933 934int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 935 struct ib_cm_compare_data *compare_data) 936{ 937 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 938 unsigned long flags; 939 int ret = 0; 940 941 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 942 service_id &= service_mask; 943 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 944 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 945 return -EINVAL; 946 947 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 948 if (cm_id->state != IB_CM_IDLE) 949 return -EINVAL; 950 951 if (compare_data) { 952 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 953 GFP_KERNEL); 954 if (!cm_id_priv->compare_data) 955 return -ENOMEM; 956 cm_mask_copy(cm_id_priv->compare_data->data, 957 compare_data->data, compare_data->mask); 958 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 959 IB_CM_COMPARE_SIZE); 960 } 961 962 cm_id->state = IB_CM_LISTEN; 963 964 spin_lock_irqsave(&cm.lock, flags); 965 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 966 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 967 cm_id->service_mask = ~cpu_to_be64(0); 968 } else { 969 cm_id->service_id = service_id; 970 cm_id->service_mask = service_mask; 971 } 972 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 973 spin_unlock_irqrestore(&cm.lock, flags); 974 975 if (cur_cm_id_priv) { 976 cm_id->state = IB_CM_IDLE; 977 kfree(cm_id_priv->compare_data); 978 cm_id_priv->compare_data = NULL; 979 ret = -EBUSY; 980 } 981 return ret; 982} 983EXPORT_SYMBOL(ib_cm_listen); 984 985static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 986 enum cm_msg_sequence msg_seq) 987{ 988 u64 hi_tid, low_tid; 989 990 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 991 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 992 (msg_seq << 30)); 993 return cpu_to_be64(hi_tid | low_tid); 994} 995 996static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 997 __be16 attr_id, __be64 tid) 998{ 999 hdr->base_version = IB_MGMT_BASE_VERSION; 1000 hdr->mgmt_class = IB_MGMT_CLASS_CM; 1001 hdr->class_version = IB_CM_CLASS_VERSION; 1002 hdr->method = IB_MGMT_METHOD_SEND; 1003 hdr->attr_id = attr_id; 1004 hdr->tid = tid; 1005} 1006 1007static void cm_format_req(struct cm_req_msg *req_msg, 1008 struct cm_id_private *cm_id_priv, 1009 struct ib_cm_req_param *param) 1010{ 1011 struct ib_sa_path_rec *pri_path = param->primary_path; 1012 struct ib_sa_path_rec *alt_path = param->alternate_path; 1013 1014 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1015 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1016 1017 req_msg->local_comm_id = cm_id_priv->id.local_id; 1018 req_msg->service_id = param->service_id; 1019 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1020 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1021 cm_req_set_resp_res(req_msg, param->responder_resources); 1022 cm_req_set_init_depth(req_msg, param->initiator_depth); 1023 cm_req_set_remote_resp_timeout(req_msg, 1024 param->remote_cm_response_timeout); 1025 if (param->remote_cm_response_timeout > (u8) max_timeout) { 1026 printk(KERN_WARNING PFX "req remote_cm_response_timeout %d > " 1027 "%d, decreasing\n", param->remote_cm_response_timeout, 1028 max_timeout); 1029 cm_req_set_remote_resp_timeout(req_msg, (u8) max_timeout); 1030 } 1031 cm_req_set_qp_type(req_msg, param->qp_type); 1032 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1033 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1034 cm_req_set_local_resp_timeout(req_msg, 1035 param->local_cm_response_timeout); 1036 if (param->local_cm_response_timeout > (u8) max_timeout) { 1037 printk(KERN_WARNING PFX "req local_cm_response_timeout %d > " 1038 "%d, decreasing\n", param->local_cm_response_timeout, 1039 max_timeout); 1040 cm_req_set_local_resp_timeout(req_msg, (u8) max_timeout); 1041 } 1042 cm_req_set_retry_count(req_msg, param->retry_count); 1043 req_msg->pkey = param->primary_path->pkey; 1044 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1045 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1046 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1047 cm_req_set_srq(req_msg, param->srq); 1048 1049 if (pri_path->hop_limit <= 1) { 1050 req_msg->primary_local_lid = pri_path->slid; 1051 req_msg->primary_remote_lid = pri_path->dlid; 1052 } else { 1053 /* Work-around until there's a way to obtain remote LID info */ 1054 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1055 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1056 } 1057 req_msg->primary_local_gid = pri_path->sgid; 1058 req_msg->primary_remote_gid = pri_path->dgid; 1059 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1060 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1061 req_msg->primary_traffic_class = pri_path->traffic_class; 1062 req_msg->primary_hop_limit = pri_path->hop_limit; 1063 cm_req_set_primary_sl(req_msg, pri_path->sl); 1064 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1065 cm_req_set_primary_local_ack_timeout(req_msg, 1066 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1067 pri_path->packet_life_time)); 1068 1069 if (alt_path) { 1070 if (alt_path->hop_limit <= 1) { 1071 req_msg->alt_local_lid = alt_path->slid; 1072 req_msg->alt_remote_lid = alt_path->dlid; 1073 } else { 1074 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1075 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1076 } 1077 req_msg->alt_local_gid = alt_path->sgid; 1078 req_msg->alt_remote_gid = alt_path->dgid; 1079 cm_req_set_alt_flow_label(req_msg, 1080 alt_path->flow_label); 1081 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1082 req_msg->alt_traffic_class = alt_path->traffic_class; 1083 req_msg->alt_hop_limit = alt_path->hop_limit; 1084 cm_req_set_alt_sl(req_msg, alt_path->sl); 1085 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1086 cm_req_set_alt_local_ack_timeout(req_msg, 1087 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1088 alt_path->packet_life_time)); 1089 } 1090 1091 if (param->private_data && param->private_data_len) 1092 memcpy(req_msg->private_data, param->private_data, 1093 param->private_data_len); 1094} 1095 1096static int cm_validate_req_param(struct ib_cm_req_param *param) 1097{ 1098 /* peer-to-peer not supported */ 1099 if (param->peer_to_peer) 1100 return -EINVAL; 1101 1102 if (!param->primary_path) 1103 return -EINVAL; 1104 1105 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 1106 return -EINVAL; 1107 1108 if (param->private_data && 1109 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1110 return -EINVAL; 1111 1112 if (param->alternate_path && 1113 (param->alternate_path->pkey != param->primary_path->pkey || 1114 param->alternate_path->mtu != param->primary_path->mtu)) 1115 return -EINVAL; 1116 1117 return 0; 1118} 1119 1120int ib_send_cm_req(struct ib_cm_id *cm_id, 1121 struct ib_cm_req_param *param) 1122{ 1123 struct cm_id_private *cm_id_priv; 1124 struct cm_req_msg *req_msg; 1125 unsigned long flags; 1126 int ret; 1127 1128 ret = cm_validate_req_param(param); 1129 if (ret) 1130 return ret; 1131 1132 /* Verify that we're not in timewait. */ 1133 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1134 spin_lock_irqsave(&cm_id_priv->lock, flags); 1135 if (cm_id->state != IB_CM_IDLE) { 1136 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1137 ret = -EINVAL; 1138 goto out; 1139 } 1140 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1141 1142 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1143 id.local_id); 1144 if (IS_ERR(cm_id_priv->timewait_info)) { 1145 ret = PTR_ERR(cm_id_priv->timewait_info); 1146 goto out; 1147 } 1148 1149 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1150 if (ret) 1151 goto error1; 1152 if (param->alternate_path) { 1153 ret = cm_init_av_by_path(param->alternate_path, 1154 &cm_id_priv->alt_av); 1155 if (ret) 1156 goto error1; 1157 } 1158 cm_id->service_id = param->service_id; 1159 cm_id->service_mask = ~cpu_to_be64(0); 1160 cm_id_priv->timeout_ms = cm_convert_to_ms( 1161 param->primary_path->packet_life_time) * 2 + 1162 cm_convert_to_ms( 1163 param->remote_cm_response_timeout); 1164 if (cm_id_priv->timeout_ms > cm_convert_to_ms(max_timeout)) { 1165 printk(KERN_WARNING PFX "req timeout_ms %d > %d, decreasing\n", 1166 cm_id_priv->timeout_ms, cm_convert_to_ms(max_timeout)); 1167 cm_id_priv->timeout_ms = cm_convert_to_ms(max_timeout); 1168 } 1169 cm_id_priv->max_cm_retries = param->max_cm_retries; 1170 cm_id_priv->initiator_depth = param->initiator_depth; 1171 cm_id_priv->responder_resources = param->responder_resources; 1172 cm_id_priv->retry_count = param->retry_count; 1173 cm_id_priv->path_mtu = param->primary_path->mtu; 1174 cm_id_priv->pkey = param->primary_path->pkey; 1175 cm_id_priv->qp_type = param->qp_type; 1176 1177 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1178 if (ret) 1179 goto error1; 1180 1181 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1182 cm_format_req(req_msg, cm_id_priv, param); 1183 cm_id_priv->tid = req_msg->hdr.tid; 1184 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1185 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1186 1187 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1188 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1189 1190 spin_lock_irqsave(&cm_id_priv->lock, flags); 1191 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1192 if (ret) { 1193 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1194 goto error2; 1195 } 1196 BUG_ON(cm_id->state != IB_CM_IDLE); 1197 cm_id->state = IB_CM_REQ_SENT; 1198 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1199 return 0; 1200 1201error2: cm_free_msg(cm_id_priv->msg); 1202error1: kfree(cm_id_priv->timewait_info); 1203out: return ret; 1204} 1205EXPORT_SYMBOL(ib_send_cm_req); 1206 1207static int cm_issue_rej(struct cm_port *port, 1208 struct ib_mad_recv_wc *mad_recv_wc, 1209 enum ib_cm_rej_reason reason, 1210 enum cm_msg_response msg_rejected, 1211 void *ari, u8 ari_length) 1212{ 1213 struct ib_mad_send_buf *msg = NULL; 1214 struct cm_rej_msg *rej_msg, *rcv_msg; 1215 int ret; 1216 1217 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1218 if (ret) 1219 return ret; 1220 1221 /* We just need common CM header information. Cast to any message. */ 1222 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1223 rej_msg = (struct cm_rej_msg *) msg->mad; 1224 1225 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1226 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1227 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1228 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1229 rej_msg->reason = cpu_to_be16(reason); 1230 1231 if (ari && ari_length) { 1232 cm_rej_set_reject_info_len(rej_msg, ari_length); 1233 memcpy(rej_msg->ari, ari, ari_length); 1234 } 1235 1236 ret = ib_post_send_mad(msg, NULL); 1237 if (ret) 1238 cm_free_msg(msg); 1239 1240 return ret; 1241} 1242 1243static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1244 __be32 local_qpn, __be32 remote_qpn) 1245{ 1246 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1247 ((local_ca_guid == remote_ca_guid) && 1248 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1249} 1250 1251static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1252 struct ib_sa_path_rec *primary_path, 1253 struct ib_sa_path_rec *alt_path) 1254{ 1255 memset(primary_path, 0, sizeof *primary_path); 1256 primary_path->dgid = req_msg->primary_local_gid; 1257 primary_path->sgid = req_msg->primary_remote_gid; 1258 primary_path->dlid = req_msg->primary_local_lid; 1259 primary_path->slid = req_msg->primary_remote_lid; 1260 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1261 primary_path->hop_limit = req_msg->primary_hop_limit; 1262 primary_path->traffic_class = req_msg->primary_traffic_class; 1263 primary_path->reversible = 1; 1264 primary_path->pkey = req_msg->pkey; 1265 primary_path->sl = cm_req_get_primary_sl(req_msg); 1266 primary_path->mtu_selector = IB_SA_EQ; 1267 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1268 primary_path->rate_selector = IB_SA_EQ; 1269 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1270 primary_path->packet_life_time_selector = IB_SA_EQ; 1271 primary_path->packet_life_time = 1272 cm_req_get_primary_local_ack_timeout(req_msg); 1273 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1274 1275 if (req_msg->alt_local_lid) { 1276 memset(alt_path, 0, sizeof *alt_path); 1277 alt_path->dgid = req_msg->alt_local_gid; 1278 alt_path->sgid = req_msg->alt_remote_gid; 1279 alt_path->dlid = req_msg->alt_local_lid; 1280 alt_path->slid = req_msg->alt_remote_lid; 1281 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1282 alt_path->hop_limit = req_msg->alt_hop_limit; 1283 alt_path->traffic_class = req_msg->alt_traffic_class; 1284 alt_path->reversible = 1; 1285 alt_path->pkey = req_msg->pkey; 1286 alt_path->sl = cm_req_get_alt_sl(req_msg); 1287 alt_path->mtu_selector = IB_SA_EQ; 1288 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1289 alt_path->rate_selector = IB_SA_EQ; 1290 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1291 alt_path->packet_life_time_selector = IB_SA_EQ; 1292 alt_path->packet_life_time = 1293 cm_req_get_alt_local_ack_timeout(req_msg); 1294 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1295 } 1296} 1297 1298static void cm_format_req_event(struct cm_work *work, 1299 struct cm_id_private *cm_id_priv, 1300 struct ib_cm_id *listen_id) 1301{ 1302 struct cm_req_msg *req_msg; 1303 struct ib_cm_req_event_param *param; 1304 1305 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1306 param = &work->cm_event.param.req_rcvd; 1307 param->listen_id = listen_id; 1308 param->port = cm_id_priv->av.port->port_num; 1309 param->primary_path = &work->path[0]; 1310 if (req_msg->alt_local_lid) 1311 param->alternate_path = &work->path[1]; 1312 else 1313 param->alternate_path = NULL; 1314 param->remote_ca_guid = req_msg->local_ca_guid; 1315 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1316 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1317 param->qp_type = cm_req_get_qp_type(req_msg); 1318 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1319 param->responder_resources = cm_req_get_init_depth(req_msg); 1320 param->initiator_depth = cm_req_get_resp_res(req_msg); 1321 param->local_cm_response_timeout = 1322 cm_req_get_remote_resp_timeout(req_msg); 1323 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1324 param->remote_cm_response_timeout = 1325 cm_req_get_local_resp_timeout(req_msg); 1326 param->retry_count = cm_req_get_retry_count(req_msg); 1327 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1328 param->srq = cm_req_get_srq(req_msg); 1329 work->cm_event.private_data = &req_msg->private_data; 1330} 1331 1332static void cm_process_work(struct cm_id_private *cm_id_priv, 1333 struct cm_work *work) 1334{ 1335 int ret; 1336 1337 /* We will typically only have the current event to report. */ 1338 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1339 cm_free_work(work); 1340 1341 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1342 spin_lock_irq(&cm_id_priv->lock); 1343 work = cm_dequeue_work(cm_id_priv); 1344 spin_unlock_irq(&cm_id_priv->lock); 1345 BUG_ON(!work); 1346 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1347 &work->cm_event); 1348 cm_free_work(work); 1349 } 1350 cm_deref_id(cm_id_priv); 1351 if (ret) 1352 cm_destroy_id(&cm_id_priv->id, ret); 1353} 1354 1355static void cm_format_mra(struct cm_mra_msg *mra_msg, 1356 struct cm_id_private *cm_id_priv, 1357 enum cm_msg_response msg_mraed, u8 service_timeout, 1358 const void *private_data, u8 private_data_len) 1359{ 1360 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1361 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1362 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1363 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1364 cm_mra_set_service_timeout(mra_msg, service_timeout); 1365 1366 if (private_data && private_data_len) 1367 memcpy(mra_msg->private_data, private_data, private_data_len); 1368} 1369 1370static void cm_format_rej(struct cm_rej_msg *rej_msg, 1371 struct cm_id_private *cm_id_priv, 1372 enum ib_cm_rej_reason reason, 1373 void *ari, 1374 u8 ari_length, 1375 const void *private_data, 1376 u8 private_data_len) 1377{ 1378 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1379 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1380 1381 switch(cm_id_priv->id.state) { 1382 case IB_CM_REQ_RCVD: 1383 rej_msg->local_comm_id = 0; 1384 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1385 break; 1386 case IB_CM_MRA_REQ_SENT: 1387 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1388 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1389 break; 1390 case IB_CM_REP_RCVD: 1391 case IB_CM_MRA_REP_SENT: 1392 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1393 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1394 break; 1395 default: 1396 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1397 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1398 break; 1399 } 1400 1401 rej_msg->reason = cpu_to_be16(reason); 1402 if (ari && ari_length) { 1403 cm_rej_set_reject_info_len(rej_msg, ari_length); 1404 memcpy(rej_msg->ari, ari, ari_length); 1405 } 1406 1407 if (private_data && private_data_len) 1408 memcpy(rej_msg->private_data, private_data, private_data_len); 1409} 1410 1411static void cm_dup_req_handler(struct cm_work *work, 1412 struct cm_id_private *cm_id_priv) 1413{ 1414 struct ib_mad_send_buf *msg = NULL; 1415 int ret; 1416 1417 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1418 counter[CM_REQ_COUNTER]); 1419 1420 /* Quick state check to discard duplicate REQs. */ 1421 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1422 return; 1423 1424 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1425 if (ret) 1426 return; 1427 1428 spin_lock_irq(&cm_id_priv->lock); 1429 switch (cm_id_priv->id.state) { 1430 case IB_CM_MRA_REQ_SENT: 1431 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1432 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1433 cm_id_priv->private_data, 1434 cm_id_priv->private_data_len); 1435 break; 1436 case IB_CM_TIMEWAIT: 1437 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1438 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1439 break; 1440 default: 1441 goto unlock; 1442 } 1443 spin_unlock_irq(&cm_id_priv->lock); 1444 1445 ret = ib_post_send_mad(msg, NULL); 1446 if (ret) 1447 goto free; 1448 return; 1449 1450unlock: spin_unlock_irq(&cm_id_priv->lock); 1451free: cm_free_msg(msg); 1452} 1453 1454static struct cm_id_private * cm_match_req(struct cm_work *work, 1455 struct cm_id_private *cm_id_priv) 1456{ 1457 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1458 struct cm_timewait_info *timewait_info; 1459 struct cm_req_msg *req_msg; 1460 1461 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1462 1463 /* Check for possible duplicate REQ. */ 1464 spin_lock_irq(&cm.lock); 1465 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1466 if (timewait_info) { 1467 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1468 timewait_info->work.remote_id); 1469 spin_unlock_irq(&cm.lock); 1470 if (cur_cm_id_priv) { 1471 cm_dup_req_handler(work, cur_cm_id_priv); 1472 cm_deref_id(cur_cm_id_priv); 1473 } 1474 return NULL; 1475 } 1476 1477 /* Check for stale connections. */ 1478 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1479 if (timewait_info) { 1480 cm_cleanup_timewait(cm_id_priv->timewait_info); 1481 spin_unlock_irq(&cm.lock); 1482 cm_issue_rej(work->port, work->mad_recv_wc, 1483 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1484 NULL, 0); 1485 return NULL; 1486 } 1487 1488 /* Find matching listen request. */ 1489 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1490 req_msg->service_id, 1491 req_msg->private_data); 1492 if (!listen_cm_id_priv) { 1493 cm_cleanup_timewait(cm_id_priv->timewait_info); 1494 spin_unlock_irq(&cm.lock); 1495 cm_issue_rej(work->port, work->mad_recv_wc, 1496 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1497 NULL, 0); 1498 goto out; 1499 } 1500 atomic_inc(&listen_cm_id_priv->refcount); 1501 atomic_inc(&cm_id_priv->refcount); 1502 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1503 atomic_inc(&cm_id_priv->work_count); 1504 spin_unlock_irq(&cm.lock); 1505out: 1506 return listen_cm_id_priv; 1507} 1508 1509/* 1510 * Work-around for inter-subnet connections. If the LIDs are permissive, 1511 * we need to override the LID/SL data in the REQ with the LID information 1512 * in the work completion. 1513 */ 1514static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1515{ 1516 if (!cm_req_get_primary_subnet_local(req_msg)) { 1517 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1518 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1519 cm_req_set_primary_sl(req_msg, wc->sl); 1520 } 1521 1522 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1523 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1524 } 1525 1526 if (!cm_req_get_alt_subnet_local(req_msg)) { 1527 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1528 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1529 cm_req_set_alt_sl(req_msg, wc->sl); 1530 } 1531 1532 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1533 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1534 } 1535} 1536 1537static int cm_req_handler(struct cm_work *work) 1538{ 1539 struct ib_cm_id *cm_id; 1540 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1541 struct cm_req_msg *req_msg; 1542 int ret; 1543 1544 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1545 1546 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1547 if (IS_ERR(cm_id)) 1548 return PTR_ERR(cm_id); 1549 1550 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1551 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1552 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1553 work->mad_recv_wc->recv_buf.grh, 1554 &cm_id_priv->av); 1555 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1556 id.local_id); 1557 if (IS_ERR(cm_id_priv->timewait_info)) { 1558 ret = PTR_ERR(cm_id_priv->timewait_info); 1559 goto destroy; 1560 } 1561 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1562 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1563 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1564 1565 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1566 if (!listen_cm_id_priv) { 1567 ret = -EINVAL; 1568 kfree(cm_id_priv->timewait_info); 1569 goto destroy; 1570 } 1571 1572 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1573 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1574 cm_id_priv->id.service_id = req_msg->service_id; 1575 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1576 1577 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1578 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1579 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1580 if (ret) { 1581 ib_get_cached_gid(work->port->cm_dev->ib_device, 1582 work->port->port_num, 0, &work->path[0].sgid); 1583 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1584 &work->path[0].sgid, sizeof work->path[0].sgid, 1585 NULL, 0); 1586 goto rejected; 1587 } 1588 if (req_msg->alt_local_lid) { 1589 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1590 if (ret) { 1591 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1592 &work->path[0].sgid, 1593 sizeof work->path[0].sgid, NULL, 0); 1594 goto rejected; 1595 } 1596 } 1597 cm_id_priv->tid = req_msg->hdr.tid; 1598 cm_id_priv->timeout_ms = cm_convert_to_ms( 1599 cm_req_get_local_resp_timeout(req_msg)); 1600 if (cm_req_get_local_resp_timeout(req_msg) > (u8) max_timeout) { 1601 printk(KERN_WARNING PFX "rcvd cm_local_resp_timeout %d > %d, " 1602 "decreasing used timeout_ms\n", 1603 cm_req_get_local_resp_timeout(req_msg), max_timeout); 1604 cm_id_priv->timeout_ms = cm_convert_to_ms(max_timeout); 1605 } 1606 1607 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1608 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1609 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1610 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1611 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1612 cm_id_priv->pkey = req_msg->pkey; 1613 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1614 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1615 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1616 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1617 1618 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1619 cm_process_work(cm_id_priv, work); 1620 cm_deref_id(listen_cm_id_priv); 1621 return 0; 1622 1623rejected: 1624 atomic_dec(&cm_id_priv->refcount); 1625 cm_deref_id(listen_cm_id_priv); 1626destroy: 1627 ib_destroy_cm_id(cm_id); 1628 return ret; 1629} 1630 1631static void cm_format_rep(struct cm_rep_msg *rep_msg, 1632 struct cm_id_private *cm_id_priv, 1633 struct ib_cm_rep_param *param) 1634{ 1635 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1636 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1637 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1638 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1639 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1640 rep_msg->resp_resources = param->responder_resources; 1641 rep_msg->initiator_depth = param->initiator_depth; 1642 cm_rep_set_target_ack_delay(rep_msg, 1643 cm_id_priv->av.port->cm_dev->ack_delay); 1644 cm_rep_set_failover(rep_msg, param->failover_accepted); 1645 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1646 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1647 cm_rep_set_srq(rep_msg, param->srq); 1648 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1649 1650 if (param->private_data && param->private_data_len) 1651 memcpy(rep_msg->private_data, param->private_data, 1652 param->private_data_len); 1653} 1654 1655int ib_send_cm_rep(struct ib_cm_id *cm_id, 1656 struct ib_cm_rep_param *param) 1657{ 1658 struct cm_id_private *cm_id_priv; 1659 struct ib_mad_send_buf *msg; 1660 struct cm_rep_msg *rep_msg; 1661 unsigned long flags; 1662 int ret; 1663 1664 if (param->private_data && 1665 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1666 return -EINVAL; 1667 1668 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1669 spin_lock_irqsave(&cm_id_priv->lock, flags); 1670 if (cm_id->state != IB_CM_REQ_RCVD && 1671 cm_id->state != IB_CM_MRA_REQ_SENT) { 1672 ret = -EINVAL; 1673 goto out; 1674 } 1675 1676 ret = cm_alloc_msg(cm_id_priv, &msg); 1677 if (ret) 1678 goto out; 1679 1680 rep_msg = (struct cm_rep_msg *) msg->mad; 1681 cm_format_rep(rep_msg, cm_id_priv, param); 1682 msg->timeout_ms = cm_id_priv->timeout_ms; 1683 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1684 1685 ret = ib_post_send_mad(msg, NULL); 1686 if (ret) { 1687 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1688 cm_free_msg(msg); 1689 return ret; 1690 } 1691 1692 cm_id->state = IB_CM_REP_SENT; 1693 cm_id_priv->msg = msg; 1694 cm_id_priv->initiator_depth = param->initiator_depth; 1695 cm_id_priv->responder_resources = param->responder_resources; 1696 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1697 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1698 1699out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1700 return ret; 1701} 1702EXPORT_SYMBOL(ib_send_cm_rep); 1703 1704static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1705 struct cm_id_private *cm_id_priv, 1706 const void *private_data, 1707 u8 private_data_len) 1708{ 1709 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1710 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1711 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1712 1713 if (private_data && private_data_len) 1714 memcpy(rtu_msg->private_data, private_data, private_data_len); 1715} 1716 1717int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1718 const void *private_data, 1719 u8 private_data_len) 1720{ 1721 struct cm_id_private *cm_id_priv; 1722 struct ib_mad_send_buf *msg; 1723 unsigned long flags; 1724 void *data; 1725 int ret; 1726 1727 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1728 return -EINVAL; 1729 1730 data = cm_copy_private_data(private_data, private_data_len); 1731 if (IS_ERR(data)) 1732 return PTR_ERR(data); 1733 1734 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1735 spin_lock_irqsave(&cm_id_priv->lock, flags); 1736 if (cm_id->state != IB_CM_REP_RCVD && 1737 cm_id->state != IB_CM_MRA_REP_SENT) { 1738 ret = -EINVAL; 1739 goto error; 1740 } 1741 1742 ret = cm_alloc_msg(cm_id_priv, &msg); 1743 if (ret) 1744 goto error; 1745 1746 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1747 private_data, private_data_len); 1748 1749 ret = ib_post_send_mad(msg, NULL); 1750 if (ret) { 1751 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1752 cm_free_msg(msg); 1753 kfree(data); 1754 return ret; 1755 } 1756 1757 cm_id->state = IB_CM_ESTABLISHED; 1758 cm_set_private_data(cm_id_priv, data, private_data_len); 1759 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1760 return 0; 1761 1762error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1763 kfree(data); 1764 return ret; 1765} 1766EXPORT_SYMBOL(ib_send_cm_rtu); 1767 1768static void cm_format_rep_event(struct cm_work *work) 1769{ 1770 struct cm_rep_msg *rep_msg; 1771 struct ib_cm_rep_event_param *param; 1772 1773 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1774 param = &work->cm_event.param.rep_rcvd; 1775 param->remote_ca_guid = rep_msg->local_ca_guid; 1776 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1777 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1778 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1779 param->responder_resources = rep_msg->initiator_depth; 1780 param->initiator_depth = rep_msg->resp_resources; 1781 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1782 param->failover_accepted = cm_rep_get_failover(rep_msg); 1783 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1784 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1785 param->srq = cm_rep_get_srq(rep_msg); 1786 work->cm_event.private_data = &rep_msg->private_data; 1787} 1788 1789static void cm_dup_rep_handler(struct cm_work *work) 1790{ 1791 struct cm_id_private *cm_id_priv; 1792 struct cm_rep_msg *rep_msg; 1793 struct ib_mad_send_buf *msg = NULL; 1794 int ret; 1795 1796 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1797 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1798 rep_msg->local_comm_id); 1799 if (!cm_id_priv) 1800 return; 1801 1802 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1803 counter[CM_REP_COUNTER]); 1804 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1805 if (ret) 1806 goto deref; 1807 1808 spin_lock_irq(&cm_id_priv->lock); 1809 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1810 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1811 cm_id_priv->private_data, 1812 cm_id_priv->private_data_len); 1813 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1814 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1815 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1816 cm_id_priv->private_data, 1817 cm_id_priv->private_data_len); 1818 else 1819 goto unlock; 1820 spin_unlock_irq(&cm_id_priv->lock); 1821 1822 ret = ib_post_send_mad(msg, NULL); 1823 if (ret) 1824 goto free; 1825 goto deref; 1826 1827unlock: spin_unlock_irq(&cm_id_priv->lock); 1828free: cm_free_msg(msg); 1829deref: cm_deref_id(cm_id_priv); 1830} 1831 1832static int cm_rep_handler(struct cm_work *work) 1833{ 1834 struct cm_id_private *cm_id_priv; 1835 struct cm_rep_msg *rep_msg; 1836 int ret; 1837 1838 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1839 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1840 if (!cm_id_priv) { 1841 cm_dup_rep_handler(work); 1842 return -EINVAL; 1843 } 1844 1845 cm_format_rep_event(work); 1846 1847 spin_lock_irq(&cm_id_priv->lock); 1848 switch (cm_id_priv->id.state) { 1849 case IB_CM_REQ_SENT: 1850 case IB_CM_MRA_REQ_RCVD: 1851 break; 1852 default: 1853 spin_unlock_irq(&cm_id_priv->lock); 1854 ret = -EINVAL; 1855 goto error; 1856 } 1857 1858 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1859 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1860 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1861 1862 spin_lock(&cm.lock); 1863 /* Check for duplicate REP. */ 1864 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1865 spin_unlock(&cm.lock); 1866 spin_unlock_irq(&cm_id_priv->lock); 1867 ret = -EINVAL; 1868 goto error; 1869 } 1870 /* Check for a stale connection. */ 1871 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1872 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1873 &cm.remote_id_table); 1874 cm_id_priv->timewait_info->inserted_remote_id = 0; 1875 spin_unlock(&cm.lock); 1876 spin_unlock_irq(&cm_id_priv->lock); 1877 cm_issue_rej(work->port, work->mad_recv_wc, 1878 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1879 NULL, 0); 1880 ret = -EINVAL; 1881 goto error; 1882 } 1883 spin_unlock(&cm.lock); 1884 1885 cm_id_priv->id.state = IB_CM_REP_RCVD; 1886 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1887 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1888 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1889 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1890 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1891 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1892 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1893 cm_id_priv->av.timeout = 1894 cm_ack_timeout(cm_id_priv->target_ack_delay, 1895 cm_id_priv->av.timeout - 1); 1896 cm_id_priv->alt_av.timeout = 1897 cm_ack_timeout(cm_id_priv->target_ack_delay, 1898 cm_id_priv->alt_av.timeout - 1); 1899 1900 /* todo: handle peer_to_peer */ 1901 1902 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1903 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1904 if (!ret) 1905 list_add_tail(&work->list, &cm_id_priv->work_list); 1906 spin_unlock_irq(&cm_id_priv->lock); 1907 1908 if (ret) 1909 cm_process_work(cm_id_priv, work); 1910 else 1911 cm_deref_id(cm_id_priv); 1912 return 0; 1913 1914error: 1915 cm_deref_id(cm_id_priv); 1916 return ret; 1917} 1918 1919static int cm_establish_handler(struct cm_work *work) 1920{ 1921 struct cm_id_private *cm_id_priv; 1922 int ret; 1923 1924 /* See comment in cm_establish about lookup. */ 1925 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1926 if (!cm_id_priv) 1927 return -EINVAL; 1928 1929 spin_lock_irq(&cm_id_priv->lock); 1930 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1931 spin_unlock_irq(&cm_id_priv->lock); 1932 goto out; 1933 } 1934 1935 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1936 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1937 if (!ret) 1938 list_add_tail(&work->list, &cm_id_priv->work_list); 1939 spin_unlock_irq(&cm_id_priv->lock); 1940 1941 if (ret) 1942 cm_process_work(cm_id_priv, work); 1943 else 1944 cm_deref_id(cm_id_priv); 1945 return 0; 1946out: 1947 cm_deref_id(cm_id_priv); 1948 return -EINVAL; 1949} 1950 1951static int cm_rtu_handler(struct cm_work *work) 1952{ 1953 struct cm_id_private *cm_id_priv; 1954 struct cm_rtu_msg *rtu_msg; 1955 int ret; 1956 1957 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1958 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1959 rtu_msg->local_comm_id); 1960 if (!cm_id_priv) 1961 return -EINVAL; 1962 1963 work->cm_event.private_data = &rtu_msg->private_data; 1964 1965 spin_lock_irq(&cm_id_priv->lock); 1966 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1967 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1968 spin_unlock_irq(&cm_id_priv->lock); 1969 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1970 counter[CM_RTU_COUNTER]); 1971 goto out; 1972 } 1973 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1974 1975 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1976 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1977 if (!ret) 1978 list_add_tail(&work->list, &cm_id_priv->work_list); 1979 spin_unlock_irq(&cm_id_priv->lock); 1980 1981 if (ret) 1982 cm_process_work(cm_id_priv, work); 1983 else 1984 cm_deref_id(cm_id_priv); 1985 return 0; 1986out: 1987 cm_deref_id(cm_id_priv); 1988 return -EINVAL; 1989} 1990 1991static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1992 struct cm_id_private *cm_id_priv, 1993 const void *private_data, 1994 u8 private_data_len) 1995{ 1996 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1997 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1998 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1999 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 2000 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 2001 2002 if (private_data && private_data_len) 2003 memcpy(dreq_msg->private_data, private_data, private_data_len); 2004} 2005 2006int ib_send_cm_dreq(struct ib_cm_id *cm_id, 2007 const void *private_data, 2008 u8 private_data_len) 2009{ 2010 struct cm_id_private *cm_id_priv; 2011 struct ib_mad_send_buf *msg; 2012 unsigned long flags; 2013 int ret; 2014 2015 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 2016 return -EINVAL; 2017 2018 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2019 spin_lock_irqsave(&cm_id_priv->lock, flags); 2020 if (cm_id->state != IB_CM_ESTABLISHED) { 2021 ret = -EINVAL; 2022 goto out; 2023 } 2024 2025 ret = cm_alloc_msg(cm_id_priv, &msg); 2026 if (ret) { 2027 cm_enter_timewait(cm_id_priv); 2028 goto out; 2029 } 2030 2031 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2032 private_data, private_data_len); 2033 msg->timeout_ms = cm_id_priv->timeout_ms; 2034 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2035 2036 ret = ib_post_send_mad(msg, NULL); 2037 if (ret) { 2038 cm_enter_timewait(cm_id_priv); 2039 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2040 cm_free_msg(msg); 2041 return ret; 2042 } 2043 2044 cm_id->state = IB_CM_DREQ_SENT; 2045 cm_id_priv->msg = msg; 2046out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2047 return ret; 2048} 2049EXPORT_SYMBOL(ib_send_cm_dreq); 2050 2051static void cm_format_drep(struct cm_drep_msg *drep_msg, 2052 struct cm_id_private *cm_id_priv, 2053 const void *private_data, 2054 u8 private_data_len) 2055{ 2056 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2057 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2058 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2059 2060 if (private_data && private_data_len) 2061 memcpy(drep_msg->private_data, private_data, private_data_len); 2062} 2063 2064int ib_send_cm_drep(struct ib_cm_id *cm_id, 2065 const void *private_data, 2066 u8 private_data_len) 2067{ 2068 struct cm_id_private *cm_id_priv; 2069 struct ib_mad_send_buf *msg; 2070 unsigned long flags; 2071 void *data; 2072 int ret; 2073 2074 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2075 return -EINVAL; 2076 2077 data = cm_copy_private_data(private_data, private_data_len); 2078 if (IS_ERR(data)) 2079 return PTR_ERR(data); 2080 2081 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2082 spin_lock_irqsave(&cm_id_priv->lock, flags); 2083 if (cm_id->state != IB_CM_DREQ_RCVD) { 2084 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2085 kfree(data); 2086 return -EINVAL; 2087 } 2088 2089 cm_set_private_data(cm_id_priv, data, private_data_len); 2090 cm_enter_timewait(cm_id_priv); 2091 2092 ret = cm_alloc_msg(cm_id_priv, &msg); 2093 if (ret) 2094 goto out; 2095 2096 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2097 private_data, private_data_len); 2098 2099 ret = ib_post_send_mad(msg, NULL); 2100 if (ret) { 2101 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2102 cm_free_msg(msg); 2103 return ret; 2104 } 2105 2106out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2107 return ret; 2108} 2109EXPORT_SYMBOL(ib_send_cm_drep); 2110 2111static int cm_issue_drep(struct cm_port *port, 2112 struct ib_mad_recv_wc *mad_recv_wc) 2113{ 2114 struct ib_mad_send_buf *msg = NULL; 2115 struct cm_dreq_msg *dreq_msg; 2116 struct cm_drep_msg *drep_msg; 2117 int ret; 2118 2119 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2120 if (ret) 2121 return ret; 2122 2123 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2124 drep_msg = (struct cm_drep_msg *) msg->mad; 2125 2126 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2127 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2128 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2129 2130 ret = ib_post_send_mad(msg, NULL); 2131 if (ret) 2132 cm_free_msg(msg); 2133 2134 return ret; 2135} 2136 2137static int cm_dreq_handler(struct cm_work *work) 2138{ 2139 struct cm_id_private *cm_id_priv; 2140 struct cm_dreq_msg *dreq_msg; 2141 struct ib_mad_send_buf *msg = NULL; 2142 int ret; 2143 2144 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2145 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2146 dreq_msg->local_comm_id); 2147 if (!cm_id_priv) { 2148 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2149 counter[CM_DREQ_COUNTER]); 2150 cm_issue_drep(work->port, work->mad_recv_wc); 2151 return -EINVAL; 2152 } 2153 2154 work->cm_event.private_data = &dreq_msg->private_data; 2155 2156 spin_lock_irq(&cm_id_priv->lock); 2157 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2158 goto unlock; 2159 2160 switch (cm_id_priv->id.state) { 2161 case IB_CM_REP_SENT: 2162 case IB_CM_DREQ_SENT: 2163 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2164 break; 2165 case IB_CM_ESTABLISHED: 2166 case IB_CM_MRA_REP_RCVD: 2167 break; 2168 case IB_CM_TIMEWAIT: 2169 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2170 counter[CM_DREQ_COUNTER]); 2171 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2172 goto unlock; 2173 2174 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2175 cm_id_priv->private_data, 2176 cm_id_priv->private_data_len); 2177 spin_unlock_irq(&cm_id_priv->lock); 2178 2179 if (ib_post_send_mad(msg, NULL)) 2180 cm_free_msg(msg); 2181 goto deref; 2182 case IB_CM_DREQ_RCVD: 2183 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2184 counter[CM_DREQ_COUNTER]); 2185 goto unlock; 2186 default: 2187 goto unlock; 2188 } 2189 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2190 cm_id_priv->tid = dreq_msg->hdr.tid; 2191 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2192 if (!ret) 2193 list_add_tail(&work->list, &cm_id_priv->work_list); 2194 spin_unlock_irq(&cm_id_priv->lock); 2195 2196 if (ret) 2197 cm_process_work(cm_id_priv, work); 2198 else 2199 cm_deref_id(cm_id_priv); 2200 return 0; 2201 2202unlock: spin_unlock_irq(&cm_id_priv->lock); 2203deref: cm_deref_id(cm_id_priv); 2204 return -EINVAL; 2205} 2206 2207static int cm_drep_handler(struct cm_work *work) 2208{ 2209 struct cm_id_private *cm_id_priv; 2210 struct cm_drep_msg *drep_msg; 2211 int ret; 2212 2213 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2214 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2215 drep_msg->local_comm_id); 2216 if (!cm_id_priv) 2217 return -EINVAL; 2218 2219 work->cm_event.private_data = &drep_msg->private_data; 2220 2221 spin_lock_irq(&cm_id_priv->lock); 2222 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2223 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2224 spin_unlock_irq(&cm_id_priv->lock); 2225 goto out; 2226 } 2227 cm_enter_timewait(cm_id_priv); 2228 2229 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2230 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2231 if (!ret) 2232 list_add_tail(&work->list, &cm_id_priv->work_list); 2233 spin_unlock_irq(&cm_id_priv->lock); 2234 2235 if (ret) 2236 cm_process_work(cm_id_priv, work); 2237 else 2238 cm_deref_id(cm_id_priv); 2239 return 0; 2240out: 2241 cm_deref_id(cm_id_priv); 2242 return -EINVAL; 2243} 2244 2245int ib_send_cm_rej(struct ib_cm_id *cm_id, 2246 enum ib_cm_rej_reason reason, 2247 void *ari, 2248 u8 ari_length, 2249 const void *private_data, 2250 u8 private_data_len) 2251{ 2252 struct cm_id_private *cm_id_priv; 2253 struct ib_mad_send_buf *msg; 2254 unsigned long flags; 2255 int ret; 2256 2257 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2258 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2259 return -EINVAL; 2260 2261 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2262 2263 spin_lock_irqsave(&cm_id_priv->lock, flags); 2264 switch (cm_id->state) { 2265 case IB_CM_REQ_SENT: 2266 case IB_CM_MRA_REQ_RCVD: 2267 case IB_CM_REQ_RCVD: 2268 case IB_CM_MRA_REQ_SENT: 2269 case IB_CM_REP_RCVD: 2270 case IB_CM_MRA_REP_SENT: 2271 ret = cm_alloc_msg(cm_id_priv, &msg); 2272 if (!ret) 2273 cm_format_rej((struct cm_rej_msg *) msg->mad, 2274 cm_id_priv, reason, ari, ari_length, 2275 private_data, private_data_len); 2276 2277 cm_reset_to_idle(cm_id_priv); 2278 break; 2279 case IB_CM_REP_SENT: 2280 case IB_CM_MRA_REP_RCVD: 2281 ret = cm_alloc_msg(cm_id_priv, &msg); 2282 if (!ret) 2283 cm_format_rej((struct cm_rej_msg *) msg->mad, 2284 cm_id_priv, reason, ari, ari_length, 2285 private_data, private_data_len); 2286 2287 cm_enter_timewait(cm_id_priv); 2288 break; 2289 default: 2290 ret = -EINVAL; 2291 goto out; 2292 } 2293 2294 if (ret) 2295 goto out; 2296 2297 ret = ib_post_send_mad(msg, NULL); 2298 if (ret) 2299 cm_free_msg(msg); 2300 2301out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2302 return ret; 2303} 2304EXPORT_SYMBOL(ib_send_cm_rej); 2305 2306static void cm_format_rej_event(struct cm_work *work) 2307{ 2308 struct cm_rej_msg *rej_msg; 2309 struct ib_cm_rej_event_param *param; 2310 2311 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2312 param = &work->cm_event.param.rej_rcvd; 2313 param->ari = rej_msg->ari; 2314 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2315 param->reason = __be16_to_cpu(rej_msg->reason); 2316 work->cm_event.private_data = &rej_msg->private_data; 2317} 2318 2319static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2320{ 2321 struct cm_timewait_info *timewait_info; 2322 struct cm_id_private *cm_id_priv; 2323 __be32 remote_id; 2324 2325 remote_id = rej_msg->local_comm_id; 2326 2327 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2328 spin_lock_irq(&cm.lock); 2329 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2330 remote_id); 2331 if (!timewait_info) { 2332 spin_unlock_irq(&cm.lock); 2333 return NULL; 2334 } 2335 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2336 (timewait_info->work.local_id ^ 2337 cm.random_id_operand)); 2338 if (cm_id_priv) { 2339 if (cm_id_priv->id.remote_id == remote_id) 2340 atomic_inc(&cm_id_priv->refcount); 2341 else 2342 cm_id_priv = NULL; 2343 } 2344 spin_unlock_irq(&cm.lock); 2345 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2346 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2347 else 2348 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2349 2350 return cm_id_priv; 2351} 2352 2353static int cm_rej_handler(struct cm_work *work) 2354{ 2355 struct cm_id_private *cm_id_priv; 2356 struct cm_rej_msg *rej_msg; 2357 int ret; 2358 2359 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2360 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2361 if (!cm_id_priv) 2362 return -EINVAL; 2363 2364 cm_format_rej_event(work); 2365 2366 spin_lock_irq(&cm_id_priv->lock); 2367 switch (cm_id_priv->id.state) { 2368 case IB_CM_REQ_SENT: 2369 case IB_CM_MRA_REQ_RCVD: 2370 case IB_CM_REP_SENT: 2371 case IB_CM_MRA_REP_RCVD: 2372 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2373 /* fall through */ 2374 case IB_CM_REQ_RCVD: 2375 case IB_CM_MRA_REQ_SENT: 2376 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2377 cm_enter_timewait(cm_id_priv); 2378 else 2379 cm_reset_to_idle(cm_id_priv); 2380 break; 2381 case IB_CM_DREQ_SENT: 2382 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2383 /* fall through */ 2384 case IB_CM_REP_RCVD: 2385 case IB_CM_MRA_REP_SENT: 2386 case IB_CM_ESTABLISHED: 2387 cm_enter_timewait(cm_id_priv); 2388 break; 2389 default: 2390 spin_unlock_irq(&cm_id_priv->lock); 2391 ret = -EINVAL; 2392 goto out; 2393 } 2394 2395 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2396 if (!ret) 2397 list_add_tail(&work->list, &cm_id_priv->work_list); 2398 spin_unlock_irq(&cm_id_priv->lock); 2399 2400 if (ret) 2401 cm_process_work(cm_id_priv, work); 2402 else 2403 cm_deref_id(cm_id_priv); 2404 return 0; 2405out: 2406 cm_deref_id(cm_id_priv); 2407 return -EINVAL; 2408} 2409 2410int ib_send_cm_mra(struct ib_cm_id *cm_id, 2411 u8 service_timeout, 2412 const void *private_data, 2413 u8 private_data_len) 2414{ 2415 struct cm_id_private *cm_id_priv; 2416 struct ib_mad_send_buf *msg; 2417 enum ib_cm_state cm_state; 2418 enum ib_cm_lap_state lap_state; 2419 enum cm_msg_response msg_response; 2420 void *data; 2421 unsigned long flags; 2422 int ret; 2423 2424 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2425 return -EINVAL; 2426 2427 data = cm_copy_private_data(private_data, private_data_len); 2428 if (IS_ERR(data)) 2429 return PTR_ERR(data); 2430 2431 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2432 2433 spin_lock_irqsave(&cm_id_priv->lock, flags); 2434 switch(cm_id_priv->id.state) { 2435 case IB_CM_REQ_RCVD: 2436 cm_state = IB_CM_MRA_REQ_SENT; 2437 lap_state = cm_id->lap_state; 2438 msg_response = CM_MSG_RESPONSE_REQ; 2439 break; 2440 case IB_CM_REP_RCVD: 2441 cm_state = IB_CM_MRA_REP_SENT; 2442 lap_state = cm_id->lap_state; 2443 msg_response = CM_MSG_RESPONSE_REP; 2444 break; 2445 case IB_CM_ESTABLISHED: 2446 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2447 cm_state = cm_id->state; 2448 lap_state = IB_CM_MRA_LAP_SENT; 2449 msg_response = CM_MSG_RESPONSE_OTHER; 2450 break; 2451 } 2452 default: 2453 ret = -EINVAL; 2454 goto error1; 2455 } 2456 2457 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2458 ret = cm_alloc_msg(cm_id_priv, &msg); 2459 if (ret) 2460 goto error1; 2461 2462 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2463 msg_response, service_timeout, 2464 private_data, private_data_len); 2465 ret = ib_post_send_mad(msg, NULL); 2466 if (ret) 2467 goto error2; 2468 } 2469 2470 cm_id->state = cm_state; 2471 cm_id->lap_state = lap_state; 2472 cm_id_priv->service_timeout = service_timeout; 2473 cm_set_private_data(cm_id_priv, data, private_data_len); 2474 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2475 return 0; 2476 2477error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2478 kfree(data); 2479 return ret; 2480 2481error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2482 kfree(data); 2483 cm_free_msg(msg); 2484 return ret; 2485} 2486EXPORT_SYMBOL(ib_send_cm_mra); 2487 2488static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2489{ 2490 switch (cm_mra_get_msg_mraed(mra_msg)) { 2491 case CM_MSG_RESPONSE_REQ: 2492 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2493 case CM_MSG_RESPONSE_REP: 2494 case CM_MSG_RESPONSE_OTHER: 2495 return cm_acquire_id(mra_msg->remote_comm_id, 2496 mra_msg->local_comm_id); 2497 default: 2498 return NULL; 2499 } 2500} 2501 2502static int cm_mra_handler(struct cm_work *work) 2503{ 2504 struct cm_id_private *cm_id_priv; 2505 struct cm_mra_msg *mra_msg; 2506 int timeout, ret; 2507 2508 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2509 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2510 if (!cm_id_priv) 2511 return -EINVAL; 2512 2513 work->cm_event.private_data = &mra_msg->private_data; 2514 work->cm_event.param.mra_rcvd.service_timeout = 2515 cm_mra_get_service_timeout(mra_msg); 2516 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2517 cm_convert_to_ms(cm_id_priv->av.timeout); 2518 if (timeout > cm_convert_to_ms(max_timeout)) { 2519 printk(KERN_WARNING PFX "calculated mra timeout %d > %d, " 2520 "decreasing used timeout_ms\n", timeout, 2521 cm_convert_to_ms(max_timeout)); 2522 timeout = cm_convert_to_ms(max_timeout); 2523 } 2524 2525 spin_lock_irq(&cm_id_priv->lock); 2526 switch (cm_id_priv->id.state) { 2527 case IB_CM_REQ_SENT: 2528 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2529 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2530 cm_id_priv->msg, timeout)) 2531 goto out; 2532 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2533 break; 2534 case IB_CM_REP_SENT: 2535 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2536 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2537 cm_id_priv->msg, timeout)) 2538 goto out; 2539 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2540 break; 2541 case IB_CM_ESTABLISHED: 2542 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2543 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2544 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2545 cm_id_priv->msg, timeout)) { 2546 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2547 atomic_long_inc(&work->port-> 2548 counter_group[CM_RECV_DUPLICATES]. 2549 counter[CM_MRA_COUNTER]); 2550 goto out; 2551 } 2552 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2553 break; 2554 case IB_CM_MRA_REQ_RCVD: 2555 case IB_CM_MRA_REP_RCVD: 2556 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2557 counter[CM_MRA_COUNTER]); 2558 /* fall through */ 2559 default: 2560 goto out; 2561 } 2562 2563 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2564 cm_id_priv->id.state; 2565 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2566 if (!ret) 2567 list_add_tail(&work->list, &cm_id_priv->work_list); 2568 spin_unlock_irq(&cm_id_priv->lock); 2569 2570 if (ret) 2571 cm_process_work(cm_id_priv, work); 2572 else 2573 cm_deref_id(cm_id_priv); 2574 return 0; 2575out: 2576 spin_unlock_irq(&cm_id_priv->lock); 2577 cm_deref_id(cm_id_priv); 2578 return -EINVAL; 2579} 2580 2581static void cm_format_lap(struct cm_lap_msg *lap_msg, 2582 struct cm_id_private *cm_id_priv, 2583 struct ib_sa_path_rec *alternate_path, 2584 const void *private_data, 2585 u8 private_data_len) 2586{ 2587 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2588 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2589 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2590 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2591 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2592 /* todo: need remote CM response timeout */ 2593 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2594 lap_msg->alt_local_lid = alternate_path->slid; 2595 lap_msg->alt_remote_lid = alternate_path->dlid; 2596 lap_msg->alt_local_gid = alternate_path->sgid; 2597 lap_msg->alt_remote_gid = alternate_path->dgid; 2598 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2599 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2600 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2601 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2602 cm_lap_set_sl(lap_msg, alternate_path->sl); 2603 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2604 cm_lap_set_local_ack_timeout(lap_msg, 2605 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2606 alternate_path->packet_life_time)); 2607 2608 if (private_data && private_data_len) 2609 memcpy(lap_msg->private_data, private_data, private_data_len); 2610} 2611 2612int ib_send_cm_lap(struct ib_cm_id *cm_id, 2613 struct ib_sa_path_rec *alternate_path, 2614 const void *private_data, 2615 u8 private_data_len) 2616{ 2617 struct cm_id_private *cm_id_priv; 2618 struct ib_mad_send_buf *msg; 2619 unsigned long flags; 2620 int ret; 2621 2622 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2623 return -EINVAL; 2624 2625 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2626 spin_lock_irqsave(&cm_id_priv->lock, flags); 2627 if (cm_id->state != IB_CM_ESTABLISHED || 2628 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2629 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2630 ret = -EINVAL; 2631 goto out; 2632 } 2633 2634 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2635 if (ret) 2636 goto out; 2637 cm_id_priv->alt_av.timeout = 2638 cm_ack_timeout(cm_id_priv->target_ack_delay, 2639 cm_id_priv->alt_av.timeout - 1); 2640 2641 ret = cm_alloc_msg(cm_id_priv, &msg); 2642 if (ret) 2643 goto out; 2644 2645 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2646 alternate_path, private_data, private_data_len); 2647 msg->timeout_ms = cm_id_priv->timeout_ms; 2648 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2649 2650 ret = ib_post_send_mad(msg, NULL); 2651 if (ret) { 2652 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2653 cm_free_msg(msg); 2654 return ret; 2655 } 2656 2657 cm_id->lap_state = IB_CM_LAP_SENT; 2658 cm_id_priv->msg = msg; 2659 2660out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2661 return ret; 2662} 2663EXPORT_SYMBOL(ib_send_cm_lap); 2664 2665static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2666 struct ib_sa_path_rec *path, 2667 struct cm_lap_msg *lap_msg) 2668{ 2669 memset(path, 0, sizeof *path); 2670 path->dgid = lap_msg->alt_local_gid; 2671 path->sgid = lap_msg->alt_remote_gid; 2672 path->dlid = lap_msg->alt_local_lid; 2673 path->slid = lap_msg->alt_remote_lid; 2674 path->flow_label = cm_lap_get_flow_label(lap_msg); 2675 path->hop_limit = lap_msg->alt_hop_limit; 2676 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2677 path->reversible = 1; 2678 path->pkey = cm_id_priv->pkey; 2679 path->sl = cm_lap_get_sl(lap_msg); 2680 path->mtu_selector = IB_SA_EQ; 2681 path->mtu = cm_id_priv->path_mtu; 2682 path->rate_selector = IB_SA_EQ; 2683 path->rate = cm_lap_get_packet_rate(lap_msg); 2684 path->packet_life_time_selector = IB_SA_EQ; 2685 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2686 path->packet_life_time -= (path->packet_life_time > 0); 2687} 2688 2689static int cm_lap_handler(struct cm_work *work) 2690{ 2691 struct cm_id_private *cm_id_priv; 2692 struct cm_lap_msg *lap_msg; 2693 struct ib_cm_lap_event_param *param; 2694 struct ib_mad_send_buf *msg = NULL; 2695 int ret; 2696 2697 /* todo: verify LAP request and send reject APR if invalid. */ 2698 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2699 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2700 lap_msg->local_comm_id); 2701 if (!cm_id_priv) 2702 return -EINVAL; 2703 2704 param = &work->cm_event.param.lap_rcvd; 2705 param->alternate_path = &work->path[0]; 2706 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2707 work->cm_event.private_data = &lap_msg->private_data; 2708 2709 spin_lock_irq(&cm_id_priv->lock); 2710 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2711 goto unlock; 2712 2713 switch (cm_id_priv->id.lap_state) { 2714 case IB_CM_LAP_UNINIT: 2715 case IB_CM_LAP_IDLE: 2716 break; 2717 case IB_CM_MRA_LAP_SENT: 2718 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2719 counter[CM_LAP_COUNTER]); 2720 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2721 goto unlock; 2722 2723 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2724 CM_MSG_RESPONSE_OTHER, 2725 cm_id_priv->service_timeout, 2726 cm_id_priv->private_data, 2727 cm_id_priv->private_data_len); 2728 spin_unlock_irq(&cm_id_priv->lock); 2729 2730 if (ib_post_send_mad(msg, NULL)) 2731 cm_free_msg(msg); 2732 goto deref; 2733 case IB_CM_LAP_RCVD: 2734 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2735 counter[CM_LAP_COUNTER]); 2736 goto unlock; 2737 default: 2738 goto unlock; 2739 } 2740 2741 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2742 cm_id_priv->tid = lap_msg->hdr.tid; 2743 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2744 work->mad_recv_wc->recv_buf.grh, 2745 &cm_id_priv->av); 2746 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2747 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2748 if (!ret) 2749 list_add_tail(&work->list, &cm_id_priv->work_list); 2750 spin_unlock_irq(&cm_id_priv->lock); 2751 2752 if (ret) 2753 cm_process_work(cm_id_priv, work); 2754 else 2755 cm_deref_id(cm_id_priv); 2756 return 0; 2757 2758unlock: spin_unlock_irq(&cm_id_priv->lock); 2759deref: cm_deref_id(cm_id_priv); 2760 return -EINVAL; 2761} 2762 2763static void cm_format_apr(struct cm_apr_msg *apr_msg, 2764 struct cm_id_private *cm_id_priv, 2765 enum ib_cm_apr_status status, 2766 void *info, 2767 u8 info_length, 2768 const void *private_data, 2769 u8 private_data_len) 2770{ 2771 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2772 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2773 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2774 apr_msg->ap_status = (u8) status; 2775 2776 if (info && info_length) { 2777 apr_msg->info_length = info_length; 2778 memcpy(apr_msg->info, info, info_length); 2779 } 2780 2781 if (private_data && private_data_len) 2782 memcpy(apr_msg->private_data, private_data, private_data_len); 2783} 2784 2785int ib_send_cm_apr(struct ib_cm_id *cm_id, 2786 enum ib_cm_apr_status status, 2787 void *info, 2788 u8 info_length, 2789 const void *private_data, 2790 u8 private_data_len) 2791{ 2792 struct cm_id_private *cm_id_priv; 2793 struct ib_mad_send_buf *msg; 2794 unsigned long flags; 2795 int ret; 2796 2797 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2798 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2799 return -EINVAL; 2800 2801 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2802 spin_lock_irqsave(&cm_id_priv->lock, flags); 2803 if (cm_id->state != IB_CM_ESTABLISHED || 2804 (cm_id->lap_state != IB_CM_LAP_RCVD && 2805 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2806 ret = -EINVAL; 2807 goto out; 2808 } 2809 2810 ret = cm_alloc_msg(cm_id_priv, &msg); 2811 if (ret) 2812 goto out; 2813 2814 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2815 info, info_length, private_data, private_data_len); 2816 ret = ib_post_send_mad(msg, NULL); 2817 if (ret) { 2818 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2819 cm_free_msg(msg); 2820 return ret; 2821 } 2822 2823 cm_id->lap_state = IB_CM_LAP_IDLE; 2824out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2825 return ret; 2826} 2827EXPORT_SYMBOL(ib_send_cm_apr); 2828 2829static int cm_apr_handler(struct cm_work *work) 2830{ 2831 struct cm_id_private *cm_id_priv; 2832 struct cm_apr_msg *apr_msg; 2833 int ret; 2834 2835 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2836 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2837 apr_msg->local_comm_id); 2838 if (!cm_id_priv) 2839 return -EINVAL; /* Unmatched reply. */ 2840 2841 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2842 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2843 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2844 work->cm_event.private_data = &apr_msg->private_data; 2845 2846 spin_lock_irq(&cm_id_priv->lock); 2847 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2848 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2849 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2850 spin_unlock_irq(&cm_id_priv->lock); 2851 goto out; 2852 } 2853 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2854 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2855 cm_id_priv->msg = NULL; 2856 2857 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2858 if (!ret) 2859 list_add_tail(&work->list, &cm_id_priv->work_list); 2860 spin_unlock_irq(&cm_id_priv->lock); 2861 2862 if (ret) 2863 cm_process_work(cm_id_priv, work); 2864 else 2865 cm_deref_id(cm_id_priv); 2866 return 0; 2867out: 2868 cm_deref_id(cm_id_priv); 2869 return -EINVAL; 2870} 2871 2872static int cm_timewait_handler(struct cm_work *work) 2873{ 2874 struct cm_timewait_info *timewait_info; 2875 struct cm_id_private *cm_id_priv; 2876 int ret; 2877 2878 timewait_info = (struct cm_timewait_info *)work; 2879 spin_lock_irq(&cm.lock); 2880 list_del(&timewait_info->list); 2881 spin_unlock_irq(&cm.lock); 2882 2883 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2884 timewait_info->work.remote_id); 2885 if (!cm_id_priv) 2886 return -EINVAL; 2887 2888 spin_lock_irq(&cm_id_priv->lock); 2889 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2890 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2891 spin_unlock_irq(&cm_id_priv->lock); 2892 goto out; 2893 } 2894 cm_id_priv->id.state = IB_CM_IDLE; 2895 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2896 if (!ret) 2897 list_add_tail(&work->list, &cm_id_priv->work_list); 2898 spin_unlock_irq(&cm_id_priv->lock); 2899 2900 if (ret) 2901 cm_process_work(cm_id_priv, work); 2902 else 2903 cm_deref_id(cm_id_priv); 2904 return 0; 2905out: 2906 cm_deref_id(cm_id_priv); 2907 return -EINVAL; 2908} 2909 2910static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2911 struct cm_id_private *cm_id_priv, 2912 struct ib_cm_sidr_req_param *param) 2913{ 2914 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2915 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2916 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2917 sidr_req_msg->pkey = param->path->pkey; 2918 sidr_req_msg->service_id = param->service_id; 2919 2920 if (param->private_data && param->private_data_len) 2921 memcpy(sidr_req_msg->private_data, param->private_data, 2922 param->private_data_len); 2923} 2924 2925int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2926 struct ib_cm_sidr_req_param *param) 2927{ 2928 struct cm_id_private *cm_id_priv; 2929 struct ib_mad_send_buf *msg; 2930 unsigned long flags; 2931 int ret; 2932 2933 if (!param->path || (param->private_data && 2934 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2935 return -EINVAL; 2936 2937 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2938 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2939 if (ret) 2940 goto out; 2941 2942 cm_id->service_id = param->service_id; 2943 cm_id->service_mask = ~cpu_to_be64(0); 2944 cm_id_priv->timeout_ms = param->timeout_ms; 2945 if (cm_id_priv->timeout_ms > cm_convert_to_ms(max_timeout)) { 2946 printk(KERN_WARNING PFX "sidr req timeout_ms %d > %d, " 2947 "decreasing used timeout_ms\n", param->timeout_ms, 2948 cm_convert_to_ms(max_timeout)); 2949 cm_id_priv->timeout_ms = cm_convert_to_ms(max_timeout); 2950 } 2951 cm_id_priv->max_cm_retries = param->max_cm_retries; 2952 ret = cm_alloc_msg(cm_id_priv, &msg); 2953 if (ret) 2954 goto out; 2955 2956 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2957 param); 2958 msg->timeout_ms = cm_id_priv->timeout_ms; 2959 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2960 2961 spin_lock_irqsave(&cm_id_priv->lock, flags); 2962 if (cm_id->state == IB_CM_IDLE) 2963 ret = ib_post_send_mad(msg, NULL); 2964 else 2965 ret = -EINVAL; 2966 2967 if (ret) { 2968 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2969 cm_free_msg(msg); 2970 goto out; 2971 } 2972 cm_id->state = IB_CM_SIDR_REQ_SENT; 2973 cm_id_priv->msg = msg; 2974 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2975out: 2976 return ret; 2977} 2978EXPORT_SYMBOL(ib_send_cm_sidr_req); 2979 2980static void cm_format_sidr_req_event(struct cm_work *work, 2981 struct ib_cm_id *listen_id) 2982{ 2983 struct cm_sidr_req_msg *sidr_req_msg; 2984 struct ib_cm_sidr_req_event_param *param; 2985 2986 sidr_req_msg = (struct cm_sidr_req_msg *) 2987 work->mad_recv_wc->recv_buf.mad; 2988 param = &work->cm_event.param.sidr_req_rcvd; 2989 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2990 param->listen_id = listen_id; 2991 param->port = work->port->port_num; 2992 work->cm_event.private_data = &sidr_req_msg->private_data; 2993} 2994 2995static int cm_sidr_req_handler(struct cm_work *work) 2996{ 2997 struct ib_cm_id *cm_id; 2998 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2999 struct cm_sidr_req_msg *sidr_req_msg; 3000 struct ib_wc *wc; 3001 3002 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 3003 if (IS_ERR(cm_id)) 3004 return PTR_ERR(cm_id); 3005 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3006 3007 /* Record SGID/SLID and request ID for lookup. */ 3008 sidr_req_msg = (struct cm_sidr_req_msg *) 3009 work->mad_recv_wc->recv_buf.mad; 3010 wc = work->mad_recv_wc->wc; 3011 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 3012 cm_id_priv->av.dgid.global.interface_id = 0; 3013 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 3014 work->mad_recv_wc->recv_buf.grh, 3015 &cm_id_priv->av); 3016 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3017 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3018 atomic_inc(&cm_id_priv->work_count); 3019 3020 spin_lock_irq(&cm.lock); 3021 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3022 if (cur_cm_id_priv) { 3023 spin_unlock_irq(&cm.lock); 3024 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3025 counter[CM_SIDR_REQ_COUNTER]); 3026 goto out; /* Duplicate message. */ 3027 } 3028 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3029 cur_cm_id_priv = cm_find_listen(cm_id->device, 3030 sidr_req_msg->service_id, 3031 sidr_req_msg->private_data); 3032 if (!cur_cm_id_priv) { 3033 spin_unlock_irq(&cm.lock); 3034 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3035 goto out; /* No match. */ 3036 } 3037 atomic_inc(&cur_cm_id_priv->refcount); 3038 spin_unlock_irq(&cm.lock); 3039 3040 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3041 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3042 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3043 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3044 3045 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3046 cm_process_work(cm_id_priv, work); 3047 cm_deref_id(cur_cm_id_priv); 3048 return 0; 3049out: 3050 ib_destroy_cm_id(&cm_id_priv->id); 3051 return -EINVAL; 3052} 3053 3054static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3055 struct cm_id_private *cm_id_priv, 3056 struct ib_cm_sidr_rep_param *param) 3057{ 3058 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3059 cm_id_priv->tid); 3060 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3061 sidr_rep_msg->status = param->status; 3062 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3063 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3064 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3065 3066 if (param->info && param->info_length) 3067 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3068 3069 if (param->private_data && param->private_data_len) 3070 memcpy(sidr_rep_msg->private_data, param->private_data, 3071 param->private_data_len); 3072} 3073 3074int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3075 struct ib_cm_sidr_rep_param *param) 3076{ 3077 struct cm_id_private *cm_id_priv; 3078 struct ib_mad_send_buf *msg; 3079 unsigned long flags; 3080 int ret; 3081 3082 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3083 (param->private_data && 3084 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3085 return -EINVAL; 3086 3087 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3088 spin_lock_irqsave(&cm_id_priv->lock, flags); 3089 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3090 ret = -EINVAL; 3091 goto error; 3092 } 3093 3094 ret = cm_alloc_msg(cm_id_priv, &msg); 3095 if (ret) 3096 goto error; 3097 3098 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3099 param); 3100 ret = ib_post_send_mad(msg, NULL); 3101 if (ret) { 3102 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3103 cm_free_msg(msg); 3104 return ret; 3105 } 3106 cm_id->state = IB_CM_IDLE; 3107 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3108 3109 spin_lock_irqsave(&cm.lock, flags); 3110 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3111 spin_unlock_irqrestore(&cm.lock, flags); 3112 return 0; 3113 3114error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3115 return ret; 3116} 3117EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3118 3119static void cm_format_sidr_rep_event(struct cm_work *work) 3120{ 3121 struct cm_sidr_rep_msg *sidr_rep_msg; 3122 struct ib_cm_sidr_rep_event_param *param; 3123 3124 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3125 work->mad_recv_wc->recv_buf.mad; 3126 param = &work->cm_event.param.sidr_rep_rcvd; 3127 param->status = sidr_rep_msg->status; 3128 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3129 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3130 param->info = &sidr_rep_msg->info; 3131 param->info_len = sidr_rep_msg->info_length; 3132 work->cm_event.private_data = &sidr_rep_msg->private_data; 3133} 3134 3135static int cm_sidr_rep_handler(struct cm_work *work) 3136{ 3137 struct cm_sidr_rep_msg *sidr_rep_msg; 3138 struct cm_id_private *cm_id_priv; 3139 3140 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3141 work->mad_recv_wc->recv_buf.mad; 3142 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3143 if (!cm_id_priv) 3144 return -EINVAL; /* Unmatched reply. */ 3145 3146 spin_lock_irq(&cm_id_priv->lock); 3147 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3148 spin_unlock_irq(&cm_id_priv->lock); 3149 goto out; 3150 } 3151 cm_id_priv->id.state = IB_CM_IDLE; 3152 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3153 spin_unlock_irq(&cm_id_priv->lock); 3154 3155 cm_format_sidr_rep_event(work); 3156 cm_process_work(cm_id_priv, work); 3157 return 0; 3158out: 3159 cm_deref_id(cm_id_priv); 3160 return -EINVAL; 3161} 3162 3163static void cm_process_send_error(struct ib_mad_send_buf *msg, 3164 enum ib_wc_status wc_status) 3165{ 3166 struct cm_id_private *cm_id_priv; 3167 struct ib_cm_event cm_event; 3168 enum ib_cm_state state; 3169 int ret; 3170 3171 memset(&cm_event, 0, sizeof cm_event); 3172 cm_id_priv = msg->context[0]; 3173 3174 /* Discard old sends or ones without a response. */ 3175 spin_lock_irq(&cm_id_priv->lock); 3176 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3177 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3178 goto discard; 3179 3180 switch (state) { 3181 case IB_CM_REQ_SENT: 3182 case IB_CM_MRA_REQ_RCVD: 3183 cm_reset_to_idle(cm_id_priv); 3184 cm_event.event = IB_CM_REQ_ERROR; 3185 break; 3186 case IB_CM_REP_SENT: 3187 case IB_CM_MRA_REP_RCVD: 3188 cm_reset_to_idle(cm_id_priv); 3189 cm_event.event = IB_CM_REP_ERROR; 3190 break; 3191 case IB_CM_DREQ_SENT: 3192 cm_enter_timewait(cm_id_priv); 3193 cm_event.event = IB_CM_DREQ_ERROR; 3194 break; 3195 case IB_CM_SIDR_REQ_SENT: 3196 cm_id_priv->id.state = IB_CM_IDLE; 3197 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3198 break; 3199 default: 3200 goto discard; 3201 } 3202 spin_unlock_irq(&cm_id_priv->lock); 3203 cm_event.param.send_status = wc_status; 3204 3205 /* No other events can occur on the cm_id at this point. */ 3206 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3207 cm_free_msg(msg); 3208 if (ret) 3209 ib_destroy_cm_id(&cm_id_priv->id); 3210 return; 3211discard: 3212 spin_unlock_irq(&cm_id_priv->lock); 3213 cm_free_msg(msg); 3214} 3215 3216static void cm_send_handler(struct ib_mad_agent *mad_agent, 3217 struct ib_mad_send_wc *mad_send_wc) 3218{ 3219 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3220 struct cm_port *port; 3221 u16 attr_index; 3222 3223 port = mad_agent->context; 3224 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3225 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3226 3227 /* 3228 * If the send was in response to a received message (context[0] is not 3229 * set to a cm_id), and is not a REJ, then it is a send that was 3230 * manually retried. 3231 */ 3232 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3233 msg->retries = 1; 3234 3235 atomic_long_add(1 + msg->retries, 3236 &port->counter_group[CM_XMIT].counter[attr_index]); 3237 if (msg->retries) 3238 atomic_long_add(msg->retries, 3239 &port->counter_group[CM_XMIT_RETRIES]. 3240 counter[attr_index]); 3241 3242 switch (mad_send_wc->status) { 3243 case IB_WC_SUCCESS: 3244 case IB_WC_WR_FLUSH_ERR: 3245 cm_free_msg(msg); 3246 break; 3247 default: 3248 if (msg->context[0] && msg->context[1]) 3249 cm_process_send_error(msg, mad_send_wc->status); 3250 else 3251 cm_free_msg(msg); 3252 break; 3253 } 3254} 3255 3256static void cm_work_handler(struct work_struct *_work) 3257{ 3258 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3259 int ret; 3260 3261 switch (work->cm_event.event) { 3262 case IB_CM_REQ_RECEIVED: 3263 ret = cm_req_handler(work); 3264 break; 3265 case IB_CM_MRA_RECEIVED: 3266 ret = cm_mra_handler(work); 3267 break; 3268 case IB_CM_REJ_RECEIVED: 3269 ret = cm_rej_handler(work); 3270 break; 3271 case IB_CM_REP_RECEIVED: 3272 ret = cm_rep_handler(work); 3273 break; 3274 case IB_CM_RTU_RECEIVED: 3275 ret = cm_rtu_handler(work); 3276 break; 3277 case IB_CM_USER_ESTABLISHED: 3278 ret = cm_establish_handler(work); 3279 break; 3280 case IB_CM_DREQ_RECEIVED: 3281 ret = cm_dreq_handler(work); 3282 break; 3283 case IB_CM_DREP_RECEIVED: 3284 ret = cm_drep_handler(work); 3285 break; 3286 case IB_CM_SIDR_REQ_RECEIVED: 3287 ret = cm_sidr_req_handler(work); 3288 break; 3289 case IB_CM_SIDR_REP_RECEIVED: 3290 ret = cm_sidr_rep_handler(work); 3291 break; 3292 case IB_CM_LAP_RECEIVED: 3293 ret = cm_lap_handler(work); 3294 break; 3295 case IB_CM_APR_RECEIVED: 3296 ret = cm_apr_handler(work); 3297 break; 3298 case IB_CM_TIMEWAIT_EXIT: 3299 ret = cm_timewait_handler(work); 3300 break; 3301 default: 3302 ret = -EINVAL; 3303 break; 3304 } 3305 if (ret) 3306 cm_free_work(work); 3307} 3308 3309static int cm_establish(struct ib_cm_id *cm_id) 3310{ 3311 struct cm_id_private *cm_id_priv; 3312 struct cm_work *work; 3313 unsigned long flags; 3314 int ret = 0; 3315 3316 work = kmalloc(sizeof *work, GFP_ATOMIC); 3317 if (!work) 3318 return -ENOMEM; 3319 3320 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3321 spin_lock_irqsave(&cm_id_priv->lock, flags); 3322 switch (cm_id->state) 3323 { 3324 case IB_CM_REP_SENT: 3325 case IB_CM_MRA_REP_RCVD: 3326 cm_id->state = IB_CM_ESTABLISHED; 3327 break; 3328 case IB_CM_ESTABLISHED: 3329 ret = -EISCONN; 3330 break; 3331 default: 3332 ret = -EINVAL; 3333 break; 3334 } 3335 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3336 3337 if (ret) { 3338 kfree(work); 3339 goto out; 3340 } 3341 3342 /* 3343 * The CM worker thread may try to destroy the cm_id before it 3344 * can execute this work item. To prevent potential deadlock, 3345 * we need to find the cm_id once we're in the context of the 3346 * worker thread, rather than holding a reference on it. 3347 */ 3348 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3349 work->local_id = cm_id->local_id; 3350 work->remote_id = cm_id->remote_id; 3351 work->mad_recv_wc = NULL; 3352 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3353 queue_delayed_work(cm.wq, &work->work, 0); 3354out: 3355 return ret; 3356} 3357 3358static int cm_migrate(struct ib_cm_id *cm_id) 3359{ 3360 struct cm_id_private *cm_id_priv; 3361 unsigned long flags; 3362 int ret = 0; 3363 3364 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3365 spin_lock_irqsave(&cm_id_priv->lock, flags); 3366 if (cm_id->state == IB_CM_ESTABLISHED && 3367 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3368 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3369 cm_id->lap_state = IB_CM_LAP_IDLE; 3370 cm_id_priv->av = cm_id_priv->alt_av; 3371 } else 3372 ret = -EINVAL; 3373 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3374 3375 return ret; 3376} 3377 3378int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3379{ 3380 int ret; 3381 3382 switch (event) { 3383 case IB_EVENT_COMM_EST: 3384 ret = cm_establish(cm_id); 3385 break; 3386 case IB_EVENT_PATH_MIG: 3387 ret = cm_migrate(cm_id); 3388 break; 3389 default: 3390 ret = -EINVAL; 3391 } 3392 return ret; 3393} 3394EXPORT_SYMBOL(ib_cm_notify); 3395 3396static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3397 struct ib_mad_recv_wc *mad_recv_wc) 3398{ 3399 struct cm_port *port = mad_agent->context; 3400 struct cm_work *work; 3401 enum ib_cm_event_type event; 3402 u16 attr_id; 3403 int paths = 0; 3404 3405 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3406 case CM_REQ_ATTR_ID: 3407 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3408 alt_local_lid != 0); 3409 event = IB_CM_REQ_RECEIVED; 3410 break; 3411 case CM_MRA_ATTR_ID: 3412 event = IB_CM_MRA_RECEIVED; 3413 break; 3414 case CM_REJ_ATTR_ID: 3415 event = IB_CM_REJ_RECEIVED; 3416 break; 3417 case CM_REP_ATTR_ID: 3418 event = IB_CM_REP_RECEIVED; 3419 break; 3420 case CM_RTU_ATTR_ID: 3421 event = IB_CM_RTU_RECEIVED; 3422 break; 3423 case CM_DREQ_ATTR_ID: 3424 event = IB_CM_DREQ_RECEIVED; 3425 break; 3426 case CM_DREP_ATTR_ID: 3427 event = IB_CM_DREP_RECEIVED; 3428 break; 3429 case CM_SIDR_REQ_ATTR_ID: 3430 event = IB_CM_SIDR_REQ_RECEIVED; 3431 break; 3432 case CM_SIDR_REP_ATTR_ID: 3433 event = IB_CM_SIDR_REP_RECEIVED; 3434 break; 3435 case CM_LAP_ATTR_ID: 3436 paths = 1; 3437 event = IB_CM_LAP_RECEIVED; 3438 break; 3439 case CM_APR_ATTR_ID: 3440 event = IB_CM_APR_RECEIVED; 3441 break; 3442 default: 3443 ib_free_recv_mad(mad_recv_wc); 3444 return; 3445 } 3446 3447 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3448 atomic_long_inc(&port->counter_group[CM_RECV]. 3449 counter[attr_id - CM_ATTR_ID_OFFSET]); 3450 3451 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3452 GFP_KERNEL); 3453 if (!work) { 3454 ib_free_recv_mad(mad_recv_wc); 3455 return; 3456 } 3457 3458 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3459 work->cm_event.event = event; 3460 work->mad_recv_wc = mad_recv_wc; 3461 work->port = port; 3462 queue_delayed_work(cm.wq, &work->work, 0); 3463} 3464 3465static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3466 struct ib_qp_attr *qp_attr, 3467 int *qp_attr_mask) 3468{ 3469 unsigned long flags; 3470 int ret; 3471 3472 spin_lock_irqsave(&cm_id_priv->lock, flags); 3473 switch (cm_id_priv->id.state) { 3474 case IB_CM_REQ_SENT: 3475 case IB_CM_MRA_REQ_RCVD: 3476 case IB_CM_REQ_RCVD: 3477 case IB_CM_MRA_REQ_SENT: 3478 case IB_CM_REP_RCVD: 3479 case IB_CM_MRA_REP_SENT: 3480 case IB_CM_REP_SENT: 3481 case IB_CM_MRA_REP_RCVD: 3482 case IB_CM_ESTABLISHED: 3483 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3484 IB_QP_PKEY_INDEX | IB_QP_PORT; 3485 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3486 if (cm_id_priv->responder_resources) 3487 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3488 IB_ACCESS_REMOTE_ATOMIC; 3489 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3490 qp_attr->port_num = cm_id_priv->av.port->port_num; 3491 ret = 0; 3492 break; 3493 default: 3494 ret = -EINVAL; 3495 break; 3496 } 3497 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3498 return ret; 3499} 3500 3501static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3502 struct ib_qp_attr *qp_attr, 3503 int *qp_attr_mask) 3504{ 3505 unsigned long flags; 3506 int ret; 3507 3508 spin_lock_irqsave(&cm_id_priv->lock, flags); 3509 switch (cm_id_priv->id.state) { 3510 case IB_CM_REQ_RCVD: 3511 case IB_CM_MRA_REQ_SENT: 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 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3518 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3519 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3520 qp_attr->path_mtu = cm_id_priv->path_mtu; 3521 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3522 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3523 if (cm_id_priv->qp_type == IB_QPT_RC) { 3524 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3525 IB_QP_MIN_RNR_TIMER; 3526 qp_attr->max_dest_rd_atomic = 3527 cm_id_priv->responder_resources; 3528 qp_attr->min_rnr_timer = 0; 3529 } 3530 if (cm_id_priv->alt_av.ah_attr.dlid) { 3531 *qp_attr_mask |= IB_QP_ALT_PATH; 3532 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3533 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3534 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3535 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3536 } 3537 ret = 0; 3538 break; 3539 default: 3540 ret = -EINVAL; 3541 break; 3542 } 3543 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3544 return ret; 3545} 3546 3547static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3548 struct ib_qp_attr *qp_attr, 3549 int *qp_attr_mask) 3550{ 3551 unsigned long flags; 3552 int ret; 3553 3554 spin_lock_irqsave(&cm_id_priv->lock, flags); 3555 switch (cm_id_priv->id.state) { 3556 /* Allow transition to RTS before sending REP */ 3557 case IB_CM_REQ_RCVD: 3558 case IB_CM_MRA_REQ_SENT: 3559 3560 case IB_CM_REP_RCVD: 3561 case IB_CM_MRA_REP_SENT: 3562 case IB_CM_REP_SENT: 3563 case IB_CM_MRA_REP_RCVD: 3564 case IB_CM_ESTABLISHED: 3565 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3566 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3567 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3568 if (cm_id_priv->qp_type == IB_QPT_RC) { 3569 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3570 IB_QP_RNR_RETRY | 3571 IB_QP_MAX_QP_RD_ATOMIC; 3572 qp_attr->timeout = cm_id_priv->av.timeout; 3573 qp_attr->retry_cnt = cm_id_priv->retry_count; 3574 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3575 qp_attr->max_rd_atomic = 3576 cm_id_priv->initiator_depth; 3577 } 3578 if (cm_id_priv->alt_av.ah_attr.dlid) { 3579 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3580 qp_attr->path_mig_state = IB_MIG_REARM; 3581 } 3582 } else { 3583 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3584 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3585 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3586 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3587 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3588 qp_attr->path_mig_state = IB_MIG_REARM; 3589 } 3590 ret = 0; 3591 break; 3592 default: 3593 ret = -EINVAL; 3594 break; 3595 } 3596 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3597 return ret; 3598} 3599 3600int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3601 struct ib_qp_attr *qp_attr, 3602 int *qp_attr_mask) 3603{ 3604 struct cm_id_private *cm_id_priv; 3605 int ret; 3606 3607 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3608 switch (qp_attr->qp_state) { 3609 case IB_QPS_INIT: 3610 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3611 break; 3612 case IB_QPS_RTR: 3613 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3614 break; 3615 case IB_QPS_RTS: 3616 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3617 break; 3618 default: 3619 ret = -EINVAL; 3620 break; 3621 } 3622 return ret; 3623} 3624EXPORT_SYMBOL(ib_cm_init_qp_attr); 3625 3626static void cm_get_ack_delay(struct cm_device *cm_dev) 3627{ 3628 struct ib_device_attr attr; 3629 3630 if (ib_query_device(cm_dev->ib_device, &attr)) 3631 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3632 else 3633 cm_dev->ack_delay = attr.local_ca_ack_delay; 3634} 3635 3636static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3637 char *buf) 3638{ 3639 struct cm_counter_group *group; 3640 struct cm_counter_attribute *cm_attr; 3641 3642 group = container_of(obj, struct cm_counter_group, obj); 3643 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3644 3645 return sprintf(buf, "%ld\n", 3646 atomic_long_read(&group->counter[cm_attr->index])); 3647} 3648 3649static struct sysfs_ops cm_counter_ops = { 3650 .show = cm_show_counter 3651}; 3652 3653static struct kobj_type cm_counter_obj_type = { 3654 .sysfs_ops = &cm_counter_ops, 3655 .default_attrs = cm_counter_default_attrs 3656}; 3657 3658static void cm_release_port_obj(struct kobject *obj) 3659{ 3660 struct cm_port *cm_port; 3661 3662 cm_port = container_of(obj, struct cm_port, port_obj); 3663 kfree(cm_port); 3664} 3665 3666static struct kobj_type cm_port_obj_type = { 3667 .release = cm_release_port_obj 3668}; 3669 3670struct class cm_class = { 3671 .name = "infiniband_cm", 3672}; 3673EXPORT_SYMBOL(cm_class); 3674 3675static int cm_create_port_fs(struct cm_port *port) 3676{ 3677 int i, ret; 3678 3679 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3680 &port->cm_dev->device->kobj, 3681 "%d", port->port_num); 3682 if (ret) { 3683 kfree(port); 3684 return ret; 3685 } 3686 3687 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3688 ret = kobject_init_and_add(&port->counter_group[i].obj, 3689 &cm_counter_obj_type, 3690 &port->port_obj, 3691 "%s", counter_group_names[i]); 3692 if (ret) 3693 goto error; 3694 } 3695 3696 return 0; 3697 3698error: 3699 while (i--) 3700 kobject_put(&port->counter_group[i].obj); 3701 kobject_put(&port->port_obj); 3702 return ret; 3703 3704} 3705 3706static void cm_remove_port_fs(struct cm_port *port) 3707{ 3708 int i; 3709 3710 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3711 kobject_put(&port->counter_group[i].obj); 3712 3713 kobject_put(&port->port_obj); 3714} 3715 3716static void cm_add_one(struct ib_device *ib_device) 3717{ 3718 struct cm_device *cm_dev; 3719 struct cm_port *port; 3720 struct ib_mad_reg_req reg_req = { 3721 .mgmt_class = IB_MGMT_CLASS_CM, 3722 .mgmt_class_version = IB_CM_CLASS_VERSION 3723 }; 3724 struct ib_port_modify port_modify = { 3725 .set_port_cap_mask = IB_PORT_CM_SUP 3726 }; 3727 unsigned long flags; 3728 int ret; 3729 u8 i; 3730 3731 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3732 return; 3733 3734 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3735 ib_device->phys_port_cnt, GFP_KERNEL); 3736 if (!cm_dev) 3737 return; 3738 3739 cm_dev->ib_device = ib_device; 3740 cm_get_ack_delay(cm_dev); 3741 3742 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3743 MKDEV(0, 0), NULL, 3744 "%s", ib_device->name); 3745 if (!cm_dev->device) { 3746 kfree(cm_dev); 3747 return; 3748 } 3749 3750 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3751 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3752 port = kzalloc(sizeof *port, GFP_KERNEL); 3753 if (!port) 3754 goto error1; 3755 3756 cm_dev->port[i-1] = port; 3757 port->cm_dev = cm_dev; 3758 port->port_num = i; 3759 3760 ret = cm_create_port_fs(port); 3761 if (ret) 3762 goto error1; 3763 3764 port->mad_agent = ib_register_mad_agent(ib_device, i, 3765 IB_QPT_GSI, 3766 ®_req, 3767 0, 3768 cm_send_handler, 3769 cm_recv_handler, 3770 port); 3771 if (IS_ERR(port->mad_agent)) 3772 goto error2; 3773 3774 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3775 if (ret) 3776 goto error3; 3777 } 3778 ib_set_client_data(ib_device, &cm_client, cm_dev); 3779 3780 write_lock_irqsave(&cm.device_lock, flags); 3781 list_add_tail(&cm_dev->list, &cm.device_list); 3782 write_unlock_irqrestore(&cm.device_lock, flags); 3783 return; 3784 3785error3: 3786 ib_unregister_mad_agent(port->mad_agent); 3787error2: 3788 cm_remove_port_fs(port); 3789error1: 3790 port_modify.set_port_cap_mask = 0; 3791 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3792 while (--i) { 3793 port = cm_dev->port[i-1]; 3794 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3795 ib_unregister_mad_agent(port->mad_agent); 3796 cm_remove_port_fs(port); 3797 } 3798 device_unregister(cm_dev->device); 3799 kfree(cm_dev); 3800} 3801 3802static void cm_remove_one(struct ib_device *ib_device) 3803{ 3804 struct cm_device *cm_dev; 3805 struct cm_port *port; 3806 struct ib_port_modify port_modify = { 3807 .clr_port_cap_mask = IB_PORT_CM_SUP 3808 }; 3809 unsigned long flags; 3810 int i; 3811 3812 cm_dev = ib_get_client_data(ib_device, &cm_client); 3813 if (!cm_dev) 3814 return; 3815 3816 write_lock_irqsave(&cm.device_lock, flags); 3817 list_del(&cm_dev->list); 3818 write_unlock_irqrestore(&cm.device_lock, flags); 3819 3820 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3821 port = cm_dev->port[i-1]; 3822 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3823 ib_unregister_mad_agent(port->mad_agent); 3824 flush_workqueue(cm.wq); 3825 cm_remove_port_fs(port); 3826 } 3827 device_unregister(cm_dev->device); 3828 kfree(cm_dev); 3829} 3830 3831static int __init ib_cm_init(void) 3832{ 3833 int ret; 3834 3835 memset(&cm, 0, sizeof cm); 3836 INIT_LIST_HEAD(&cm.device_list); 3837 rwlock_init(&cm.device_lock); 3838 spin_lock_init(&cm.lock); 3839 cm.listen_service_table = RB_ROOT; 3840 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3841 cm.remote_id_table = RB_ROOT; 3842 cm.remote_qp_table = RB_ROOT; 3843 cm.remote_sidr_table = RB_ROOT; 3844 idr_init(&cm.local_id_table); 3845 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3846 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3847 INIT_LIST_HEAD(&cm.timewait_list); 3848 3849 ret = class_register(&cm_class); 3850 if (ret) 3851 return -ENOMEM; 3852 3853 cm.wq = create_workqueue("ib_cm"); 3854 if (!cm.wq) { 3855 ret = -ENOMEM; 3856 goto error1; 3857 } 3858 3859 ret = ib_register_client(&cm_client); 3860 if (ret) 3861 goto error2; 3862 3863 return 0; 3864error2: 3865 destroy_workqueue(cm.wq); 3866error1: 3867 class_unregister(&cm_class); 3868 return ret; 3869} 3870 3871static void __exit ib_cm_cleanup(void) 3872{ 3873 struct cm_timewait_info *timewait_info, *tmp; 3874 3875 spin_lock_irq(&cm.lock); 3876 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3877 cancel_delayed_work(&timewait_info->work.work); 3878 spin_unlock_irq(&cm.lock); 3879 3880 ib_unregister_client(&cm_client); 3881 destroy_workqueue(cm.wq); 3882 3883 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3884 list_del(&timewait_info->list); 3885 kfree(timewait_info); 3886 } 3887 3888 class_unregister(&cm_class); 3889 idr_destroy(&cm.local_id_table); 3890} 3891 3892module_init_order(ib_cm_init, SI_ORDER_SECOND); 3893module_exit(ib_cm_cleanup); 3894 3895