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