cm.c revision 87d4abda83a125dec65181a6ecce3035db76d46a
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 51#include <rdma/ib_cache.h> 52#include <rdma/ib_cm.h> 53#include "cm_msgs.h" 54 55MODULE_AUTHOR("Sean Hefty"); 56MODULE_DESCRIPTION("InfiniBand CM"); 57MODULE_LICENSE("Dual BSD/GPL"); 58 59static void cm_add_one(struct ib_device *device); 60static void cm_remove_one(struct ib_device *device); 61 62static struct ib_client cm_client = { 63 .name = "cm", 64 .add = cm_add_one, 65 .remove = cm_remove_one 66}; 67 68static struct ib_cm { 69 spinlock_t lock; 70 struct list_head device_list; 71 rwlock_t device_lock; 72 struct rb_root listen_service_table; 73 u64 listen_service_id; 74 /* struct rb_root peer_service_table; todo: fix peer to peer */ 75 struct rb_root remote_qp_table; 76 struct rb_root remote_id_table; 77 struct rb_root remote_sidr_table; 78 struct idr local_id_table; 79 __be32 random_id_operand; 80 struct list_head timewait_list; 81 struct workqueue_struct *wq; 82} cm; 83 84/* Counter indexes ordered by attribute ID */ 85enum { 86 CM_REQ_COUNTER, 87 CM_MRA_COUNTER, 88 CM_REJ_COUNTER, 89 CM_REP_COUNTER, 90 CM_RTU_COUNTER, 91 CM_DREQ_COUNTER, 92 CM_DREP_COUNTER, 93 CM_SIDR_REQ_COUNTER, 94 CM_SIDR_REP_COUNTER, 95 CM_LAP_COUNTER, 96 CM_APR_COUNTER, 97 CM_ATTR_COUNT, 98 CM_ATTR_ID_OFFSET = 0x0010, 99}; 100 101enum { 102 CM_XMIT, 103 CM_XMIT_RETRIES, 104 CM_RECV, 105 CM_RECV_DUPLICATES, 106 CM_COUNTER_GROUPS 107}; 108 109static char const counter_group_names[CM_COUNTER_GROUPS] 110 [sizeof("cm_rx_duplicates")] = { 111 "cm_tx_msgs", "cm_tx_retries", 112 "cm_rx_msgs", "cm_rx_duplicates" 113}; 114 115struct cm_counter_group { 116 struct kobject obj; 117 atomic_long_t counter[CM_ATTR_COUNT]; 118}; 119 120struct cm_counter_attribute { 121 struct attribute attr; 122 int index; 123}; 124 125#define CM_COUNTER_ATTR(_name, _index) \ 126struct cm_counter_attribute cm_##_name##_counter_attr = { \ 127 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 128 .index = _index \ 129} 130 131static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 132static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 133static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 134static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 135static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 136static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 137static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 138static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 139static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 140static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 141static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 142 143static struct attribute *cm_counter_default_attrs[] = { 144 &cm_req_counter_attr.attr, 145 &cm_mra_counter_attr.attr, 146 &cm_rej_counter_attr.attr, 147 &cm_rep_counter_attr.attr, 148 &cm_rtu_counter_attr.attr, 149 &cm_dreq_counter_attr.attr, 150 &cm_drep_counter_attr.attr, 151 &cm_sidr_req_counter_attr.attr, 152 &cm_sidr_rep_counter_attr.attr, 153 &cm_lap_counter_attr.attr, 154 &cm_apr_counter_attr.attr, 155 NULL 156}; 157 158struct cm_port { 159 struct cm_device *cm_dev; 160 struct ib_mad_agent *mad_agent; 161 struct kobject port_obj; 162 u8 port_num; 163 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 164}; 165 166struct cm_device { 167 struct list_head list; 168 struct ib_device *ib_device; 169 struct device *device; 170 u8 ack_delay; 171 struct cm_port *port[0]; 172}; 173 174struct cm_av { 175 struct cm_port *port; 176 union ib_gid dgid; 177 struct ib_ah_attr ah_attr; 178 u16 pkey_index; 179 u8 timeout; 180}; 181 182struct cm_work { 183 struct delayed_work work; 184 struct list_head list; 185 struct cm_port *port; 186 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 187 __be32 local_id; /* Established / timewait */ 188 __be32 remote_id; 189 struct ib_cm_event cm_event; 190 struct ib_sa_path_rec path[0]; 191}; 192 193struct cm_timewait_info { 194 struct cm_work work; /* Must be first. */ 195 struct list_head list; 196 struct rb_node remote_qp_node; 197 struct rb_node remote_id_node; 198 __be64 remote_ca_guid; 199 __be32 remote_qpn; 200 u8 inserted_remote_qp; 201 u8 inserted_remote_id; 202}; 203 204struct cm_id_private { 205 struct ib_cm_id id; 206 207 struct rb_node service_node; 208 struct rb_node sidr_id_node; 209 spinlock_t lock; /* Do not acquire inside cm.lock */ 210 struct completion comp; 211 atomic_t refcount; 212 213 struct ib_mad_send_buf *msg; 214 struct cm_timewait_info *timewait_info; 215 /* todo: use alternate port on send failure */ 216 struct cm_av av; 217 struct cm_av alt_av; 218 struct ib_cm_compare_data *compare_data; 219 220 void *private_data; 221 __be64 tid; 222 __be32 local_qpn; 223 __be32 remote_qpn; 224 enum ib_qp_type qp_type; 225 __be32 sq_psn; 226 __be32 rq_psn; 227 int timeout_ms; 228 enum ib_mtu path_mtu; 229 __be16 pkey; 230 u8 private_data_len; 231 u8 max_cm_retries; 232 u8 peer_to_peer; 233 u8 responder_resources; 234 u8 initiator_depth; 235 u8 retry_count; 236 u8 rnr_retry_count; 237 u8 service_timeout; 238 u8 target_ack_delay; 239 240 struct list_head work_list; 241 atomic_t work_count; 242}; 243 244static void cm_work_handler(struct work_struct *work); 245 246static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 247{ 248 if (atomic_dec_and_test(&cm_id_priv->refcount)) 249 complete(&cm_id_priv->comp); 250} 251 252static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 253 struct ib_mad_send_buf **msg) 254{ 255 struct ib_mad_agent *mad_agent; 256 struct ib_mad_send_buf *m; 257 struct ib_ah *ah; 258 259 mad_agent = cm_id_priv->av.port->mad_agent; 260 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 261 if (IS_ERR(ah)) 262 return PTR_ERR(ah); 263 264 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 265 cm_id_priv->av.pkey_index, 266 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 267 GFP_ATOMIC); 268 if (IS_ERR(m)) { 269 ib_destroy_ah(ah); 270 return PTR_ERR(m); 271 } 272 273 /* Timeout set by caller if response is expected. */ 274 m->ah = ah; 275 m->retries = cm_id_priv->max_cm_retries; 276 277 atomic_inc(&cm_id_priv->refcount); 278 m->context[0] = cm_id_priv; 279 *msg = m; 280 return 0; 281} 282 283static int cm_alloc_response_msg(struct cm_port *port, 284 struct ib_mad_recv_wc *mad_recv_wc, 285 struct ib_mad_send_buf **msg) 286{ 287 struct ib_mad_send_buf *m; 288 struct ib_ah *ah; 289 290 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 291 mad_recv_wc->recv_buf.grh, port->port_num); 292 if (IS_ERR(ah)) 293 return PTR_ERR(ah); 294 295 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 296 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 297 GFP_ATOMIC); 298 if (IS_ERR(m)) { 299 ib_destroy_ah(ah); 300 return PTR_ERR(m); 301 } 302 m->ah = ah; 303 *msg = m; 304 return 0; 305} 306 307static void cm_free_msg(struct ib_mad_send_buf *msg) 308{ 309 ib_destroy_ah(msg->ah); 310 if (msg->context[0]) 311 cm_deref_id(msg->context[0]); 312 ib_free_send_mad(msg); 313} 314 315static void * cm_copy_private_data(const void *private_data, 316 u8 private_data_len) 317{ 318 void *data; 319 320 if (!private_data || !private_data_len) 321 return NULL; 322 323 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 324 if (!data) 325 return ERR_PTR(-ENOMEM); 326 327 return data; 328} 329 330static void cm_set_private_data(struct cm_id_private *cm_id_priv, 331 void *private_data, u8 private_data_len) 332{ 333 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 334 kfree(cm_id_priv->private_data); 335 336 cm_id_priv->private_data = private_data; 337 cm_id_priv->private_data_len = private_data_len; 338} 339 340static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 341 struct ib_grh *grh, struct cm_av *av) 342{ 343 av->port = port; 344 av->pkey_index = wc->pkey_index; 345 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 346 grh, &av->ah_attr); 347} 348 349static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 350{ 351 struct cm_device *cm_dev; 352 struct cm_port *port = NULL; 353 unsigned long flags; 354 int ret; 355 u8 p; 356 357 read_lock_irqsave(&cm.device_lock, flags); 358 list_for_each_entry(cm_dev, &cm.device_list, list) { 359 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 360 &p, NULL)) { 361 port = cm_dev->port[p-1]; 362 break; 363 } 364 } 365 read_unlock_irqrestore(&cm.device_lock, flags); 366 367 if (!port) 368 return -EINVAL; 369 370 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 371 be16_to_cpu(path->pkey), &av->pkey_index); 372 if (ret) 373 return ret; 374 375 av->port = port; 376 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path, 377 &av->ah_attr); 378 av->timeout = path->packet_life_time + 1; 379 return 0; 380} 381 382static int cm_alloc_id(struct cm_id_private *cm_id_priv) 383{ 384 unsigned long flags; 385 int ret, id; 386 static int next_id; 387 388 do { 389 spin_lock_irqsave(&cm.lock, flags); 390 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 391 next_id, &id); 392 if (!ret) 393 next_id = ((unsigned) id + 1) & MAX_ID_MASK; 394 spin_unlock_irqrestore(&cm.lock, flags); 395 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 396 397 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 398 return ret; 399} 400 401static void cm_free_id(__be32 local_id) 402{ 403 spin_lock_irq(&cm.lock); 404 idr_remove(&cm.local_id_table, 405 (__force int) (local_id ^ cm.random_id_operand)); 406 spin_unlock_irq(&cm.lock); 407} 408 409static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 410{ 411 struct cm_id_private *cm_id_priv; 412 413 cm_id_priv = idr_find(&cm.local_id_table, 414 (__force int) (local_id ^ cm.random_id_operand)); 415 if (cm_id_priv) { 416 if (cm_id_priv->id.remote_id == remote_id) 417 atomic_inc(&cm_id_priv->refcount); 418 else 419 cm_id_priv = NULL; 420 } 421 422 return cm_id_priv; 423} 424 425static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 426{ 427 struct cm_id_private *cm_id_priv; 428 429 spin_lock_irq(&cm.lock); 430 cm_id_priv = cm_get_id(local_id, remote_id); 431 spin_unlock_irq(&cm.lock); 432 433 return cm_id_priv; 434} 435 436static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 437{ 438 int i; 439 440 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 441 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 442 ((unsigned long *) mask)[i]; 443} 444 445static int cm_compare_data(struct ib_cm_compare_data *src_data, 446 struct ib_cm_compare_data *dst_data) 447{ 448 u8 src[IB_CM_COMPARE_SIZE]; 449 u8 dst[IB_CM_COMPARE_SIZE]; 450 451 if (!src_data || !dst_data) 452 return 0; 453 454 cm_mask_copy(src, src_data->data, dst_data->mask); 455 cm_mask_copy(dst, dst_data->data, src_data->mask); 456 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 457} 458 459static int cm_compare_private_data(u8 *private_data, 460 struct ib_cm_compare_data *dst_data) 461{ 462 u8 src[IB_CM_COMPARE_SIZE]; 463 464 if (!dst_data) 465 return 0; 466 467 cm_mask_copy(src, private_data, dst_data->mask); 468 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 469} 470 471/* 472 * Trivial helpers to strip endian annotation and compare; the 473 * endianness doesn't actually matter since we just need a stable 474 * order for the RB tree. 475 */ 476static int be32_lt(__be32 a, __be32 b) 477{ 478 return (__force u32) a < (__force u32) b; 479} 480 481static int be32_gt(__be32 a, __be32 b) 482{ 483 return (__force u32) a > (__force u32) b; 484} 485 486static int be64_lt(__be64 a, __be64 b) 487{ 488 return (__force u64) a < (__force u64) b; 489} 490 491static int be64_gt(__be64 a, __be64 b) 492{ 493 return (__force u64) a > (__force u64) b; 494} 495 496static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 497{ 498 struct rb_node **link = &cm.listen_service_table.rb_node; 499 struct rb_node *parent = NULL; 500 struct cm_id_private *cur_cm_id_priv; 501 __be64 service_id = cm_id_priv->id.service_id; 502 __be64 service_mask = cm_id_priv->id.service_mask; 503 int data_cmp; 504 505 while (*link) { 506 parent = *link; 507 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 508 service_node); 509 data_cmp = cm_compare_data(cm_id_priv->compare_data, 510 cur_cm_id_priv->compare_data); 511 if ((cur_cm_id_priv->id.service_mask & service_id) == 512 (service_mask & cur_cm_id_priv->id.service_id) && 513 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 514 !data_cmp) 515 return cur_cm_id_priv; 516 517 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 518 link = &(*link)->rb_left; 519 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 520 link = &(*link)->rb_right; 521 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 522 link = &(*link)->rb_left; 523 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 524 link = &(*link)->rb_right; 525 else if (data_cmp < 0) 526 link = &(*link)->rb_left; 527 else 528 link = &(*link)->rb_right; 529 } 530 rb_link_node(&cm_id_priv->service_node, parent, link); 531 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 532 return NULL; 533} 534 535static struct cm_id_private * cm_find_listen(struct ib_device *device, 536 __be64 service_id, 537 u8 *private_data) 538{ 539 struct rb_node *node = cm.listen_service_table.rb_node; 540 struct cm_id_private *cm_id_priv; 541 int data_cmp; 542 543 while (node) { 544 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 545 data_cmp = cm_compare_private_data(private_data, 546 cm_id_priv->compare_data); 547 if ((cm_id_priv->id.service_mask & service_id) == 548 cm_id_priv->id.service_id && 549 (cm_id_priv->id.device == device) && !data_cmp) 550 return cm_id_priv; 551 552 if (device < cm_id_priv->id.device) 553 node = node->rb_left; 554 else if (device > cm_id_priv->id.device) 555 node = node->rb_right; 556 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 557 node = node->rb_left; 558 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 559 node = node->rb_right; 560 else if (data_cmp < 0) 561 node = node->rb_left; 562 else 563 node = node->rb_right; 564 } 565 return NULL; 566} 567 568static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 569 *timewait_info) 570{ 571 struct rb_node **link = &cm.remote_id_table.rb_node; 572 struct rb_node *parent = NULL; 573 struct cm_timewait_info *cur_timewait_info; 574 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 575 __be32 remote_id = timewait_info->work.remote_id; 576 577 while (*link) { 578 parent = *link; 579 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 580 remote_id_node); 581 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 582 link = &(*link)->rb_left; 583 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 584 link = &(*link)->rb_right; 585 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 586 link = &(*link)->rb_left; 587 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 588 link = &(*link)->rb_right; 589 else 590 return cur_timewait_info; 591 } 592 timewait_info->inserted_remote_id = 1; 593 rb_link_node(&timewait_info->remote_id_node, parent, link); 594 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 595 return NULL; 596} 597 598static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 599 __be32 remote_id) 600{ 601 struct rb_node *node = cm.remote_id_table.rb_node; 602 struct cm_timewait_info *timewait_info; 603 604 while (node) { 605 timewait_info = rb_entry(node, struct cm_timewait_info, 606 remote_id_node); 607 if (be32_lt(remote_id, timewait_info->work.remote_id)) 608 node = node->rb_left; 609 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 610 node = node->rb_right; 611 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 612 node = node->rb_left; 613 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 614 node = node->rb_right; 615 else 616 return timewait_info; 617 } 618 return NULL; 619} 620 621static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 622 *timewait_info) 623{ 624 struct rb_node **link = &cm.remote_qp_table.rb_node; 625 struct rb_node *parent = NULL; 626 struct cm_timewait_info *cur_timewait_info; 627 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 628 __be32 remote_qpn = timewait_info->remote_qpn; 629 630 while (*link) { 631 parent = *link; 632 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 633 remote_qp_node); 634 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 635 link = &(*link)->rb_left; 636 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 637 link = &(*link)->rb_right; 638 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 639 link = &(*link)->rb_left; 640 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 641 link = &(*link)->rb_right; 642 else 643 return cur_timewait_info; 644 } 645 timewait_info->inserted_remote_qp = 1; 646 rb_link_node(&timewait_info->remote_qp_node, parent, link); 647 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 648 return NULL; 649} 650 651static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 652 *cm_id_priv) 653{ 654 struct rb_node **link = &cm.remote_sidr_table.rb_node; 655 struct rb_node *parent = NULL; 656 struct cm_id_private *cur_cm_id_priv; 657 union ib_gid *port_gid = &cm_id_priv->av.dgid; 658 __be32 remote_id = cm_id_priv->id.remote_id; 659 660 while (*link) { 661 parent = *link; 662 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 663 sidr_id_node); 664 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 665 link = &(*link)->rb_left; 666 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 667 link = &(*link)->rb_right; 668 else { 669 int cmp; 670 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 671 sizeof *port_gid); 672 if (cmp < 0) 673 link = &(*link)->rb_left; 674 else if (cmp > 0) 675 link = &(*link)->rb_right; 676 else 677 return cur_cm_id_priv; 678 } 679 } 680 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 681 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 682 return NULL; 683} 684 685static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 686 enum ib_cm_sidr_status status) 687{ 688 struct ib_cm_sidr_rep_param param; 689 690 memset(¶m, 0, sizeof param); 691 param.status = status; 692 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 693} 694 695struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 696 ib_cm_handler cm_handler, 697 void *context) 698{ 699 struct cm_id_private *cm_id_priv; 700 int ret; 701 702 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 703 if (!cm_id_priv) 704 return ERR_PTR(-ENOMEM); 705 706 cm_id_priv->id.state = IB_CM_IDLE; 707 cm_id_priv->id.device = device; 708 cm_id_priv->id.cm_handler = cm_handler; 709 cm_id_priv->id.context = context; 710 cm_id_priv->id.remote_cm_qpn = 1; 711 ret = cm_alloc_id(cm_id_priv); 712 if (ret) 713 goto error; 714 715 spin_lock_init(&cm_id_priv->lock); 716 init_completion(&cm_id_priv->comp); 717 INIT_LIST_HEAD(&cm_id_priv->work_list); 718 atomic_set(&cm_id_priv->work_count, -1); 719 atomic_set(&cm_id_priv->refcount, 1); 720 return &cm_id_priv->id; 721 722error: 723 kfree(cm_id_priv); 724 return ERR_PTR(-ENOMEM); 725} 726EXPORT_SYMBOL(ib_create_cm_id); 727 728static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 729{ 730 struct cm_work *work; 731 732 if (list_empty(&cm_id_priv->work_list)) 733 return NULL; 734 735 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 736 list_del(&work->list); 737 return work; 738} 739 740static void cm_free_work(struct cm_work *work) 741{ 742 if (work->mad_recv_wc) 743 ib_free_recv_mad(work->mad_recv_wc); 744 kfree(work); 745} 746 747static inline int cm_convert_to_ms(int iba_time) 748{ 749 /* approximate conversion to ms from 4.096us x 2^iba_time */ 750 return 1 << max(iba_time - 8, 0); 751} 752 753/* 754 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 755 * Because of how ack_timeout is stored, adding one doubles the timeout. 756 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 757 * increment it (round up) only if the other is within 50%. 758 */ 759static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 760{ 761 int ack_timeout = packet_life_time + 1; 762 763 if (ack_timeout >= ca_ack_delay) 764 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 765 else 766 ack_timeout = ca_ack_delay + 767 (ack_timeout >= (ca_ack_delay - 1)); 768 769 return min(31, ack_timeout); 770} 771 772static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 773{ 774 if (timewait_info->inserted_remote_id) { 775 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 776 timewait_info->inserted_remote_id = 0; 777 } 778 779 if (timewait_info->inserted_remote_qp) { 780 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 781 timewait_info->inserted_remote_qp = 0; 782 } 783} 784 785static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 786{ 787 struct cm_timewait_info *timewait_info; 788 789 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 790 if (!timewait_info) 791 return ERR_PTR(-ENOMEM); 792 793 timewait_info->work.local_id = local_id; 794 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 795 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 796 return timewait_info; 797} 798 799static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 800{ 801 int wait_time; 802 unsigned long flags; 803 804 spin_lock_irqsave(&cm.lock, flags); 805 cm_cleanup_timewait(cm_id_priv->timewait_info); 806 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 807 spin_unlock_irqrestore(&cm.lock, flags); 808 809 /* 810 * The cm_id could be destroyed by the user before we exit timewait. 811 * To protect against this, we search for the cm_id after exiting 812 * timewait before notifying the user that we've exited timewait. 813 */ 814 cm_id_priv->id.state = IB_CM_TIMEWAIT; 815 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 816 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 817 msecs_to_jiffies(wait_time)); 818 cm_id_priv->timewait_info = NULL; 819} 820 821static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 822{ 823 unsigned long flags; 824 825 cm_id_priv->id.state = IB_CM_IDLE; 826 if (cm_id_priv->timewait_info) { 827 spin_lock_irqsave(&cm.lock, flags); 828 cm_cleanup_timewait(cm_id_priv->timewait_info); 829 spin_unlock_irqrestore(&cm.lock, flags); 830 kfree(cm_id_priv->timewait_info); 831 cm_id_priv->timewait_info = NULL; 832 } 833} 834 835static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 836{ 837 struct cm_id_private *cm_id_priv; 838 struct cm_work *work; 839 840 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 841retest: 842 spin_lock_irq(&cm_id_priv->lock); 843 switch (cm_id->state) { 844 case IB_CM_LISTEN: 845 cm_id->state = IB_CM_IDLE; 846 spin_unlock_irq(&cm_id_priv->lock); 847 spin_lock_irq(&cm.lock); 848 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 849 spin_unlock_irq(&cm.lock); 850 break; 851 case IB_CM_SIDR_REQ_SENT: 852 cm_id->state = IB_CM_IDLE; 853 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 854 spin_unlock_irq(&cm_id_priv->lock); 855 break; 856 case IB_CM_SIDR_REQ_RCVD: 857 spin_unlock_irq(&cm_id_priv->lock); 858 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 859 break; 860 case IB_CM_REQ_SENT: 861 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 862 spin_unlock_irq(&cm_id_priv->lock); 863 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 864 &cm_id_priv->id.device->node_guid, 865 sizeof cm_id_priv->id.device->node_guid, 866 NULL, 0); 867 break; 868 case IB_CM_REQ_RCVD: 869 if (err == -ENOMEM) { 870 /* Do not reject to allow future retries. */ 871 cm_reset_to_idle(cm_id_priv); 872 spin_unlock_irq(&cm_id_priv->lock); 873 } else { 874 spin_unlock_irq(&cm_id_priv->lock); 875 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 876 NULL, 0, NULL, 0); 877 } 878 break; 879 case IB_CM_MRA_REQ_RCVD: 880 case IB_CM_REP_SENT: 881 case IB_CM_MRA_REP_RCVD: 882 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 883 /* Fall through */ 884 case IB_CM_MRA_REQ_SENT: 885 case IB_CM_REP_RCVD: 886 case IB_CM_MRA_REP_SENT: 887 spin_unlock_irq(&cm_id_priv->lock); 888 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 889 NULL, 0, NULL, 0); 890 break; 891 case IB_CM_ESTABLISHED: 892 spin_unlock_irq(&cm_id_priv->lock); 893 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT) 894 break; 895 ib_send_cm_dreq(cm_id, NULL, 0); 896 goto retest; 897 case IB_CM_DREQ_SENT: 898 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 899 cm_enter_timewait(cm_id_priv); 900 spin_unlock_irq(&cm_id_priv->lock); 901 break; 902 case IB_CM_DREQ_RCVD: 903 spin_unlock_irq(&cm_id_priv->lock); 904 ib_send_cm_drep(cm_id, NULL, 0); 905 break; 906 default: 907 spin_unlock_irq(&cm_id_priv->lock); 908 break; 909 } 910 911 cm_free_id(cm_id->local_id); 912 cm_deref_id(cm_id_priv); 913 wait_for_completion(&cm_id_priv->comp); 914 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 915 cm_free_work(work); 916 kfree(cm_id_priv->compare_data); 917 kfree(cm_id_priv->private_data); 918 kfree(cm_id_priv); 919} 920 921void ib_destroy_cm_id(struct ib_cm_id *cm_id) 922{ 923 cm_destroy_id(cm_id, 0); 924} 925EXPORT_SYMBOL(ib_destroy_cm_id); 926 927int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 928 struct ib_cm_compare_data *compare_data) 929{ 930 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 931 unsigned long flags; 932 int ret = 0; 933 934 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 935 service_id &= service_mask; 936 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 937 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 938 return -EINVAL; 939 940 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 941 if (cm_id->state != IB_CM_IDLE) 942 return -EINVAL; 943 944 if (compare_data) { 945 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 946 GFP_KERNEL); 947 if (!cm_id_priv->compare_data) 948 return -ENOMEM; 949 cm_mask_copy(cm_id_priv->compare_data->data, 950 compare_data->data, compare_data->mask); 951 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 952 IB_CM_COMPARE_SIZE); 953 } 954 955 cm_id->state = IB_CM_LISTEN; 956 957 spin_lock_irqsave(&cm.lock, flags); 958 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 959 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 960 cm_id->service_mask = ~cpu_to_be64(0); 961 } else { 962 cm_id->service_id = service_id; 963 cm_id->service_mask = service_mask; 964 } 965 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 966 spin_unlock_irqrestore(&cm.lock, flags); 967 968 if (cur_cm_id_priv) { 969 cm_id->state = IB_CM_IDLE; 970 kfree(cm_id_priv->compare_data); 971 cm_id_priv->compare_data = NULL; 972 ret = -EBUSY; 973 } 974 return ret; 975} 976EXPORT_SYMBOL(ib_cm_listen); 977 978static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 979 enum cm_msg_sequence msg_seq) 980{ 981 u64 hi_tid, low_tid; 982 983 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 984 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 985 (msg_seq << 30)); 986 return cpu_to_be64(hi_tid | low_tid); 987} 988 989static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 990 __be16 attr_id, __be64 tid) 991{ 992 hdr->base_version = IB_MGMT_BASE_VERSION; 993 hdr->mgmt_class = IB_MGMT_CLASS_CM; 994 hdr->class_version = IB_CM_CLASS_VERSION; 995 hdr->method = IB_MGMT_METHOD_SEND; 996 hdr->attr_id = attr_id; 997 hdr->tid = tid; 998} 999 1000static void cm_format_req(struct cm_req_msg *req_msg, 1001 struct cm_id_private *cm_id_priv, 1002 struct ib_cm_req_param *param) 1003{ 1004 struct ib_sa_path_rec *pri_path = param->primary_path; 1005 struct ib_sa_path_rec *alt_path = param->alternate_path; 1006 1007 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1008 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1009 1010 req_msg->local_comm_id = cm_id_priv->id.local_id; 1011 req_msg->service_id = param->service_id; 1012 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1013 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1014 cm_req_set_init_depth(req_msg, param->initiator_depth); 1015 cm_req_set_remote_resp_timeout(req_msg, 1016 param->remote_cm_response_timeout); 1017 cm_req_set_qp_type(req_msg, param->qp_type); 1018 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1019 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1020 cm_req_set_local_resp_timeout(req_msg, 1021 param->local_cm_response_timeout); 1022 req_msg->pkey = param->primary_path->pkey; 1023 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1024 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1025 1026 if (param->qp_type != IB_QPT_XRC_INI) { 1027 cm_req_set_resp_res(req_msg, param->responder_resources); 1028 cm_req_set_retry_count(req_msg, param->retry_count); 1029 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1030 cm_req_set_srq(req_msg, param->srq); 1031 } 1032 1033 if (pri_path->hop_limit <= 1) { 1034 req_msg->primary_local_lid = pri_path->slid; 1035 req_msg->primary_remote_lid = pri_path->dlid; 1036 } else { 1037 /* Work-around until there's a way to obtain remote LID info */ 1038 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1039 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1040 } 1041 req_msg->primary_local_gid = pri_path->sgid; 1042 req_msg->primary_remote_gid = pri_path->dgid; 1043 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1044 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1045 req_msg->primary_traffic_class = pri_path->traffic_class; 1046 req_msg->primary_hop_limit = pri_path->hop_limit; 1047 cm_req_set_primary_sl(req_msg, pri_path->sl); 1048 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1049 cm_req_set_primary_local_ack_timeout(req_msg, 1050 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1051 pri_path->packet_life_time)); 1052 1053 if (alt_path) { 1054 if (alt_path->hop_limit <= 1) { 1055 req_msg->alt_local_lid = alt_path->slid; 1056 req_msg->alt_remote_lid = alt_path->dlid; 1057 } else { 1058 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1059 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1060 } 1061 req_msg->alt_local_gid = alt_path->sgid; 1062 req_msg->alt_remote_gid = alt_path->dgid; 1063 cm_req_set_alt_flow_label(req_msg, 1064 alt_path->flow_label); 1065 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1066 req_msg->alt_traffic_class = alt_path->traffic_class; 1067 req_msg->alt_hop_limit = alt_path->hop_limit; 1068 cm_req_set_alt_sl(req_msg, alt_path->sl); 1069 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1070 cm_req_set_alt_local_ack_timeout(req_msg, 1071 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1072 alt_path->packet_life_time)); 1073 } 1074 1075 if (param->private_data && param->private_data_len) 1076 memcpy(req_msg->private_data, param->private_data, 1077 param->private_data_len); 1078} 1079 1080static int cm_validate_req_param(struct ib_cm_req_param *param) 1081{ 1082 /* peer-to-peer not supported */ 1083 if (param->peer_to_peer) 1084 return -EINVAL; 1085 1086 if (!param->primary_path) 1087 return -EINVAL; 1088 1089 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC && 1090 param->qp_type != IB_QPT_XRC_INI) 1091 return -EINVAL; 1092 1093 if (param->private_data && 1094 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1095 return -EINVAL; 1096 1097 if (param->alternate_path && 1098 (param->alternate_path->pkey != param->primary_path->pkey || 1099 param->alternate_path->mtu != param->primary_path->mtu)) 1100 return -EINVAL; 1101 1102 return 0; 1103} 1104 1105int ib_send_cm_req(struct ib_cm_id *cm_id, 1106 struct ib_cm_req_param *param) 1107{ 1108 struct cm_id_private *cm_id_priv; 1109 struct cm_req_msg *req_msg; 1110 unsigned long flags; 1111 int ret; 1112 1113 ret = cm_validate_req_param(param); 1114 if (ret) 1115 return ret; 1116 1117 /* Verify that we're not in timewait. */ 1118 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1119 spin_lock_irqsave(&cm_id_priv->lock, flags); 1120 if (cm_id->state != IB_CM_IDLE) { 1121 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1122 ret = -EINVAL; 1123 goto out; 1124 } 1125 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1126 1127 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1128 id.local_id); 1129 if (IS_ERR(cm_id_priv->timewait_info)) { 1130 ret = PTR_ERR(cm_id_priv->timewait_info); 1131 goto out; 1132 } 1133 1134 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1135 if (ret) 1136 goto error1; 1137 if (param->alternate_path) { 1138 ret = cm_init_av_by_path(param->alternate_path, 1139 &cm_id_priv->alt_av); 1140 if (ret) 1141 goto error1; 1142 } 1143 cm_id->service_id = param->service_id; 1144 cm_id->service_mask = ~cpu_to_be64(0); 1145 cm_id_priv->timeout_ms = cm_convert_to_ms( 1146 param->primary_path->packet_life_time) * 2 + 1147 cm_convert_to_ms( 1148 param->remote_cm_response_timeout); 1149 cm_id_priv->max_cm_retries = param->max_cm_retries; 1150 cm_id_priv->initiator_depth = param->initiator_depth; 1151 cm_id_priv->responder_resources = param->responder_resources; 1152 cm_id_priv->retry_count = param->retry_count; 1153 cm_id_priv->path_mtu = param->primary_path->mtu; 1154 cm_id_priv->pkey = param->primary_path->pkey; 1155 cm_id_priv->qp_type = param->qp_type; 1156 1157 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1158 if (ret) 1159 goto error1; 1160 1161 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1162 cm_format_req(req_msg, cm_id_priv, param); 1163 cm_id_priv->tid = req_msg->hdr.tid; 1164 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1165 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1166 1167 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1168 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1169 1170 spin_lock_irqsave(&cm_id_priv->lock, flags); 1171 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1172 if (ret) { 1173 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1174 goto error2; 1175 } 1176 BUG_ON(cm_id->state != IB_CM_IDLE); 1177 cm_id->state = IB_CM_REQ_SENT; 1178 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1179 return 0; 1180 1181error2: cm_free_msg(cm_id_priv->msg); 1182error1: kfree(cm_id_priv->timewait_info); 1183out: return ret; 1184} 1185EXPORT_SYMBOL(ib_send_cm_req); 1186 1187static int cm_issue_rej(struct cm_port *port, 1188 struct ib_mad_recv_wc *mad_recv_wc, 1189 enum ib_cm_rej_reason reason, 1190 enum cm_msg_response msg_rejected, 1191 void *ari, u8 ari_length) 1192{ 1193 struct ib_mad_send_buf *msg = NULL; 1194 struct cm_rej_msg *rej_msg, *rcv_msg; 1195 int ret; 1196 1197 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1198 if (ret) 1199 return ret; 1200 1201 /* We just need common CM header information. Cast to any message. */ 1202 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1203 rej_msg = (struct cm_rej_msg *) msg->mad; 1204 1205 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1206 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1207 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1208 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1209 rej_msg->reason = cpu_to_be16(reason); 1210 1211 if (ari && ari_length) { 1212 cm_rej_set_reject_info_len(rej_msg, ari_length); 1213 memcpy(rej_msg->ari, ari, ari_length); 1214 } 1215 1216 ret = ib_post_send_mad(msg, NULL); 1217 if (ret) 1218 cm_free_msg(msg); 1219 1220 return ret; 1221} 1222 1223static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1224 __be32 local_qpn, __be32 remote_qpn) 1225{ 1226 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1227 ((local_ca_guid == remote_ca_guid) && 1228 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1229} 1230 1231static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1232 struct ib_sa_path_rec *primary_path, 1233 struct ib_sa_path_rec *alt_path) 1234{ 1235 memset(primary_path, 0, sizeof *primary_path); 1236 primary_path->dgid = req_msg->primary_local_gid; 1237 primary_path->sgid = req_msg->primary_remote_gid; 1238 primary_path->dlid = req_msg->primary_local_lid; 1239 primary_path->slid = req_msg->primary_remote_lid; 1240 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1241 primary_path->hop_limit = req_msg->primary_hop_limit; 1242 primary_path->traffic_class = req_msg->primary_traffic_class; 1243 primary_path->reversible = 1; 1244 primary_path->pkey = req_msg->pkey; 1245 primary_path->sl = cm_req_get_primary_sl(req_msg); 1246 primary_path->mtu_selector = IB_SA_EQ; 1247 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1248 primary_path->rate_selector = IB_SA_EQ; 1249 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1250 primary_path->packet_life_time_selector = IB_SA_EQ; 1251 primary_path->packet_life_time = 1252 cm_req_get_primary_local_ack_timeout(req_msg); 1253 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1254 1255 if (req_msg->alt_local_lid) { 1256 memset(alt_path, 0, sizeof *alt_path); 1257 alt_path->dgid = req_msg->alt_local_gid; 1258 alt_path->sgid = req_msg->alt_remote_gid; 1259 alt_path->dlid = req_msg->alt_local_lid; 1260 alt_path->slid = req_msg->alt_remote_lid; 1261 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1262 alt_path->hop_limit = req_msg->alt_hop_limit; 1263 alt_path->traffic_class = req_msg->alt_traffic_class; 1264 alt_path->reversible = 1; 1265 alt_path->pkey = req_msg->pkey; 1266 alt_path->sl = cm_req_get_alt_sl(req_msg); 1267 alt_path->mtu_selector = IB_SA_EQ; 1268 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1269 alt_path->rate_selector = IB_SA_EQ; 1270 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1271 alt_path->packet_life_time_selector = IB_SA_EQ; 1272 alt_path->packet_life_time = 1273 cm_req_get_alt_local_ack_timeout(req_msg); 1274 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1275 } 1276} 1277 1278static void cm_format_req_event(struct cm_work *work, 1279 struct cm_id_private *cm_id_priv, 1280 struct ib_cm_id *listen_id) 1281{ 1282 struct cm_req_msg *req_msg; 1283 struct ib_cm_req_event_param *param; 1284 1285 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1286 param = &work->cm_event.param.req_rcvd; 1287 param->listen_id = listen_id; 1288 param->port = cm_id_priv->av.port->port_num; 1289 param->primary_path = &work->path[0]; 1290 if (req_msg->alt_local_lid) 1291 param->alternate_path = &work->path[1]; 1292 else 1293 param->alternate_path = NULL; 1294 param->remote_ca_guid = req_msg->local_ca_guid; 1295 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1296 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1297 param->qp_type = cm_req_get_qp_type(req_msg); 1298 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1299 param->responder_resources = cm_req_get_init_depth(req_msg); 1300 param->initiator_depth = cm_req_get_resp_res(req_msg); 1301 param->local_cm_response_timeout = 1302 cm_req_get_remote_resp_timeout(req_msg); 1303 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1304 param->remote_cm_response_timeout = 1305 cm_req_get_local_resp_timeout(req_msg); 1306 param->retry_count = cm_req_get_retry_count(req_msg); 1307 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1308 param->srq = cm_req_get_srq(req_msg); 1309 work->cm_event.private_data = &req_msg->private_data; 1310} 1311 1312static void cm_process_work(struct cm_id_private *cm_id_priv, 1313 struct cm_work *work) 1314{ 1315 int ret; 1316 1317 /* We will typically only have the current event to report. */ 1318 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1319 cm_free_work(work); 1320 1321 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1322 spin_lock_irq(&cm_id_priv->lock); 1323 work = cm_dequeue_work(cm_id_priv); 1324 spin_unlock_irq(&cm_id_priv->lock); 1325 BUG_ON(!work); 1326 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1327 &work->cm_event); 1328 cm_free_work(work); 1329 } 1330 cm_deref_id(cm_id_priv); 1331 if (ret) 1332 cm_destroy_id(&cm_id_priv->id, ret); 1333} 1334 1335static void cm_format_mra(struct cm_mra_msg *mra_msg, 1336 struct cm_id_private *cm_id_priv, 1337 enum cm_msg_response msg_mraed, u8 service_timeout, 1338 const void *private_data, u8 private_data_len) 1339{ 1340 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1341 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1342 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1343 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1344 cm_mra_set_service_timeout(mra_msg, service_timeout); 1345 1346 if (private_data && private_data_len) 1347 memcpy(mra_msg->private_data, private_data, private_data_len); 1348} 1349 1350static void cm_format_rej(struct cm_rej_msg *rej_msg, 1351 struct cm_id_private *cm_id_priv, 1352 enum ib_cm_rej_reason reason, 1353 void *ari, 1354 u8 ari_length, 1355 const void *private_data, 1356 u8 private_data_len) 1357{ 1358 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1359 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1360 1361 switch(cm_id_priv->id.state) { 1362 case IB_CM_REQ_RCVD: 1363 rej_msg->local_comm_id = 0; 1364 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1365 break; 1366 case IB_CM_MRA_REQ_SENT: 1367 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1368 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1369 break; 1370 case IB_CM_REP_RCVD: 1371 case IB_CM_MRA_REP_SENT: 1372 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1373 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1374 break; 1375 default: 1376 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1377 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1378 break; 1379 } 1380 1381 rej_msg->reason = cpu_to_be16(reason); 1382 if (ari && ari_length) { 1383 cm_rej_set_reject_info_len(rej_msg, ari_length); 1384 memcpy(rej_msg->ari, ari, ari_length); 1385 } 1386 1387 if (private_data && private_data_len) 1388 memcpy(rej_msg->private_data, private_data, private_data_len); 1389} 1390 1391static void cm_dup_req_handler(struct cm_work *work, 1392 struct cm_id_private *cm_id_priv) 1393{ 1394 struct ib_mad_send_buf *msg = NULL; 1395 int ret; 1396 1397 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1398 counter[CM_REQ_COUNTER]); 1399 1400 /* Quick state check to discard duplicate REQs. */ 1401 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1402 return; 1403 1404 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1405 if (ret) 1406 return; 1407 1408 spin_lock_irq(&cm_id_priv->lock); 1409 switch (cm_id_priv->id.state) { 1410 case IB_CM_MRA_REQ_SENT: 1411 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1412 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1413 cm_id_priv->private_data, 1414 cm_id_priv->private_data_len); 1415 break; 1416 case IB_CM_TIMEWAIT: 1417 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1418 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1419 break; 1420 default: 1421 goto unlock; 1422 } 1423 spin_unlock_irq(&cm_id_priv->lock); 1424 1425 ret = ib_post_send_mad(msg, NULL); 1426 if (ret) 1427 goto free; 1428 return; 1429 1430unlock: spin_unlock_irq(&cm_id_priv->lock); 1431free: cm_free_msg(msg); 1432} 1433 1434static struct cm_id_private * cm_match_req(struct cm_work *work, 1435 struct cm_id_private *cm_id_priv) 1436{ 1437 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1438 struct cm_timewait_info *timewait_info; 1439 struct cm_req_msg *req_msg; 1440 1441 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1442 1443 /* Check for possible duplicate REQ. */ 1444 spin_lock_irq(&cm.lock); 1445 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1446 if (timewait_info) { 1447 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1448 timewait_info->work.remote_id); 1449 spin_unlock_irq(&cm.lock); 1450 if (cur_cm_id_priv) { 1451 cm_dup_req_handler(work, cur_cm_id_priv); 1452 cm_deref_id(cur_cm_id_priv); 1453 } 1454 return NULL; 1455 } 1456 1457 /* Check for stale connections. */ 1458 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1459 if (timewait_info) { 1460 cm_cleanup_timewait(cm_id_priv->timewait_info); 1461 spin_unlock_irq(&cm.lock); 1462 cm_issue_rej(work->port, work->mad_recv_wc, 1463 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1464 NULL, 0); 1465 return NULL; 1466 } 1467 1468 /* Find matching listen request. */ 1469 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1470 req_msg->service_id, 1471 req_msg->private_data); 1472 if (!listen_cm_id_priv) { 1473 cm_cleanup_timewait(cm_id_priv->timewait_info); 1474 spin_unlock_irq(&cm.lock); 1475 cm_issue_rej(work->port, work->mad_recv_wc, 1476 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1477 NULL, 0); 1478 goto out; 1479 } 1480 atomic_inc(&listen_cm_id_priv->refcount); 1481 atomic_inc(&cm_id_priv->refcount); 1482 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1483 atomic_inc(&cm_id_priv->work_count); 1484 spin_unlock_irq(&cm.lock); 1485out: 1486 return listen_cm_id_priv; 1487} 1488 1489/* 1490 * Work-around for inter-subnet connections. If the LIDs are permissive, 1491 * we need to override the LID/SL data in the REQ with the LID information 1492 * in the work completion. 1493 */ 1494static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1495{ 1496 if (!cm_req_get_primary_subnet_local(req_msg)) { 1497 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1498 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1499 cm_req_set_primary_sl(req_msg, wc->sl); 1500 } 1501 1502 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1503 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1504 } 1505 1506 if (!cm_req_get_alt_subnet_local(req_msg)) { 1507 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1508 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1509 cm_req_set_alt_sl(req_msg, wc->sl); 1510 } 1511 1512 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1513 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1514 } 1515} 1516 1517static int cm_req_handler(struct cm_work *work) 1518{ 1519 struct ib_cm_id *cm_id; 1520 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1521 struct cm_req_msg *req_msg; 1522 int ret; 1523 1524 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1525 1526 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1527 if (IS_ERR(cm_id)) 1528 return PTR_ERR(cm_id); 1529 1530 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1531 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1532 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1533 work->mad_recv_wc->recv_buf.grh, 1534 &cm_id_priv->av); 1535 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1536 id.local_id); 1537 if (IS_ERR(cm_id_priv->timewait_info)) { 1538 ret = PTR_ERR(cm_id_priv->timewait_info); 1539 goto destroy; 1540 } 1541 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1542 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1543 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1544 1545 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1546 if (!listen_cm_id_priv) { 1547 ret = -EINVAL; 1548 kfree(cm_id_priv->timewait_info); 1549 goto destroy; 1550 } 1551 1552 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1553 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1554 cm_id_priv->id.service_id = req_msg->service_id; 1555 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1556 1557 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1558 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1559 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1560 if (ret) { 1561 ib_get_cached_gid(work->port->cm_dev->ib_device, 1562 work->port->port_num, 0, &work->path[0].sgid); 1563 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1564 &work->path[0].sgid, sizeof work->path[0].sgid, 1565 NULL, 0); 1566 goto rejected; 1567 } 1568 if (req_msg->alt_local_lid) { 1569 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1570 if (ret) { 1571 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1572 &work->path[0].sgid, 1573 sizeof work->path[0].sgid, NULL, 0); 1574 goto rejected; 1575 } 1576 } 1577 cm_id_priv->tid = req_msg->hdr.tid; 1578 cm_id_priv->timeout_ms = cm_convert_to_ms( 1579 cm_req_get_local_resp_timeout(req_msg)); 1580 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1581 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1582 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1583 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1584 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1585 cm_id_priv->pkey = req_msg->pkey; 1586 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1587 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1588 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1589 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1590 1591 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1592 cm_process_work(cm_id_priv, work); 1593 cm_deref_id(listen_cm_id_priv); 1594 return 0; 1595 1596rejected: 1597 atomic_dec(&cm_id_priv->refcount); 1598 cm_deref_id(listen_cm_id_priv); 1599destroy: 1600 ib_destroy_cm_id(cm_id); 1601 return ret; 1602} 1603 1604static void cm_format_rep(struct cm_rep_msg *rep_msg, 1605 struct cm_id_private *cm_id_priv, 1606 struct ib_cm_rep_param *param) 1607{ 1608 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1609 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1610 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1611 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1612 rep_msg->resp_resources = param->responder_resources; 1613 cm_rep_set_target_ack_delay(rep_msg, 1614 cm_id_priv->av.port->cm_dev->ack_delay); 1615 cm_rep_set_failover(rep_msg, param->failover_accepted); 1616 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1617 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1618 1619 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) { 1620 rep_msg->initiator_depth = param->initiator_depth; 1621 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1622 cm_rep_set_srq(rep_msg, param->srq); 1623 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1624 } else { 1625 cm_rep_set_srq(rep_msg, 1); 1626 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num)); 1627 } 1628 1629 if (param->private_data && param->private_data_len) 1630 memcpy(rep_msg->private_data, param->private_data, 1631 param->private_data_len); 1632} 1633 1634int ib_send_cm_rep(struct ib_cm_id *cm_id, 1635 struct ib_cm_rep_param *param) 1636{ 1637 struct cm_id_private *cm_id_priv; 1638 struct ib_mad_send_buf *msg; 1639 struct cm_rep_msg *rep_msg; 1640 unsigned long flags; 1641 int ret; 1642 1643 if (param->private_data && 1644 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1645 return -EINVAL; 1646 1647 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1648 spin_lock_irqsave(&cm_id_priv->lock, flags); 1649 if (cm_id->state != IB_CM_REQ_RCVD && 1650 cm_id->state != IB_CM_MRA_REQ_SENT) { 1651 ret = -EINVAL; 1652 goto out; 1653 } 1654 1655 ret = cm_alloc_msg(cm_id_priv, &msg); 1656 if (ret) 1657 goto out; 1658 1659 rep_msg = (struct cm_rep_msg *) msg->mad; 1660 cm_format_rep(rep_msg, cm_id_priv, param); 1661 msg->timeout_ms = cm_id_priv->timeout_ms; 1662 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1663 1664 ret = ib_post_send_mad(msg, NULL); 1665 if (ret) { 1666 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1667 cm_free_msg(msg); 1668 return ret; 1669 } 1670 1671 cm_id->state = IB_CM_REP_SENT; 1672 cm_id_priv->msg = msg; 1673 cm_id_priv->initiator_depth = param->initiator_depth; 1674 cm_id_priv->responder_resources = param->responder_resources; 1675 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1676 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF); 1677 1678out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1679 return ret; 1680} 1681EXPORT_SYMBOL(ib_send_cm_rep); 1682 1683static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1684 struct cm_id_private *cm_id_priv, 1685 const void *private_data, 1686 u8 private_data_len) 1687{ 1688 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1689 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1690 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1691 1692 if (private_data && private_data_len) 1693 memcpy(rtu_msg->private_data, private_data, private_data_len); 1694} 1695 1696int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1697 const void *private_data, 1698 u8 private_data_len) 1699{ 1700 struct cm_id_private *cm_id_priv; 1701 struct ib_mad_send_buf *msg; 1702 unsigned long flags; 1703 void *data; 1704 int ret; 1705 1706 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1707 return -EINVAL; 1708 1709 data = cm_copy_private_data(private_data, private_data_len); 1710 if (IS_ERR(data)) 1711 return PTR_ERR(data); 1712 1713 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1714 spin_lock_irqsave(&cm_id_priv->lock, flags); 1715 if (cm_id->state != IB_CM_REP_RCVD && 1716 cm_id->state != IB_CM_MRA_REP_SENT) { 1717 ret = -EINVAL; 1718 goto error; 1719 } 1720 1721 ret = cm_alloc_msg(cm_id_priv, &msg); 1722 if (ret) 1723 goto error; 1724 1725 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1726 private_data, private_data_len); 1727 1728 ret = ib_post_send_mad(msg, NULL); 1729 if (ret) { 1730 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1731 cm_free_msg(msg); 1732 kfree(data); 1733 return ret; 1734 } 1735 1736 cm_id->state = IB_CM_ESTABLISHED; 1737 cm_set_private_data(cm_id_priv, data, private_data_len); 1738 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1739 return 0; 1740 1741error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1742 kfree(data); 1743 return ret; 1744} 1745EXPORT_SYMBOL(ib_send_cm_rtu); 1746 1747static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type) 1748{ 1749 struct cm_rep_msg *rep_msg; 1750 struct ib_cm_rep_event_param *param; 1751 1752 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1753 param = &work->cm_event.param.rep_rcvd; 1754 param->remote_ca_guid = rep_msg->local_ca_guid; 1755 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1756 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type)); 1757 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1758 param->responder_resources = rep_msg->initiator_depth; 1759 param->initiator_depth = rep_msg->resp_resources; 1760 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1761 param->failover_accepted = cm_rep_get_failover(rep_msg); 1762 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1763 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1764 param->srq = cm_rep_get_srq(rep_msg); 1765 work->cm_event.private_data = &rep_msg->private_data; 1766} 1767 1768static void cm_dup_rep_handler(struct cm_work *work) 1769{ 1770 struct cm_id_private *cm_id_priv; 1771 struct cm_rep_msg *rep_msg; 1772 struct ib_mad_send_buf *msg = NULL; 1773 int ret; 1774 1775 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1776 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1777 rep_msg->local_comm_id); 1778 if (!cm_id_priv) 1779 return; 1780 1781 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1782 counter[CM_REP_COUNTER]); 1783 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1784 if (ret) 1785 goto deref; 1786 1787 spin_lock_irq(&cm_id_priv->lock); 1788 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1789 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1790 cm_id_priv->private_data, 1791 cm_id_priv->private_data_len); 1792 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1793 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1794 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1795 cm_id_priv->private_data, 1796 cm_id_priv->private_data_len); 1797 else 1798 goto unlock; 1799 spin_unlock_irq(&cm_id_priv->lock); 1800 1801 ret = ib_post_send_mad(msg, NULL); 1802 if (ret) 1803 goto free; 1804 goto deref; 1805 1806unlock: spin_unlock_irq(&cm_id_priv->lock); 1807free: cm_free_msg(msg); 1808deref: cm_deref_id(cm_id_priv); 1809} 1810 1811static int cm_rep_handler(struct cm_work *work) 1812{ 1813 struct cm_id_private *cm_id_priv; 1814 struct cm_rep_msg *rep_msg; 1815 int ret; 1816 1817 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1818 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1819 if (!cm_id_priv) { 1820 cm_dup_rep_handler(work); 1821 return -EINVAL; 1822 } 1823 1824 cm_format_rep_event(work, cm_id_priv->qp_type); 1825 1826 spin_lock_irq(&cm_id_priv->lock); 1827 switch (cm_id_priv->id.state) { 1828 case IB_CM_REQ_SENT: 1829 case IB_CM_MRA_REQ_RCVD: 1830 break; 1831 default: 1832 spin_unlock_irq(&cm_id_priv->lock); 1833 ret = -EINVAL; 1834 goto error; 1835 } 1836 1837 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1838 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1839 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1840 1841 spin_lock(&cm.lock); 1842 /* Check for duplicate REP. */ 1843 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1844 spin_unlock(&cm.lock); 1845 spin_unlock_irq(&cm_id_priv->lock); 1846 ret = -EINVAL; 1847 goto error; 1848 } 1849 /* Check for a stale connection. */ 1850 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1851 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1852 &cm.remote_id_table); 1853 cm_id_priv->timewait_info->inserted_remote_id = 0; 1854 spin_unlock(&cm.lock); 1855 spin_unlock_irq(&cm_id_priv->lock); 1856 cm_issue_rej(work->port, work->mad_recv_wc, 1857 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1858 NULL, 0); 1859 ret = -EINVAL; 1860 goto error; 1861 } 1862 spin_unlock(&cm.lock); 1863 1864 cm_id_priv->id.state = IB_CM_REP_RCVD; 1865 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1866 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type); 1867 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1868 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1869 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1870 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1871 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1872 cm_id_priv->av.timeout = 1873 cm_ack_timeout(cm_id_priv->target_ack_delay, 1874 cm_id_priv->av.timeout - 1); 1875 cm_id_priv->alt_av.timeout = 1876 cm_ack_timeout(cm_id_priv->target_ack_delay, 1877 cm_id_priv->alt_av.timeout - 1); 1878 1879 /* todo: handle peer_to_peer */ 1880 1881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1882 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1883 if (!ret) 1884 list_add_tail(&work->list, &cm_id_priv->work_list); 1885 spin_unlock_irq(&cm_id_priv->lock); 1886 1887 if (ret) 1888 cm_process_work(cm_id_priv, work); 1889 else 1890 cm_deref_id(cm_id_priv); 1891 return 0; 1892 1893error: 1894 cm_deref_id(cm_id_priv); 1895 return ret; 1896} 1897 1898static int cm_establish_handler(struct cm_work *work) 1899{ 1900 struct cm_id_private *cm_id_priv; 1901 int ret; 1902 1903 /* See comment in cm_establish about lookup. */ 1904 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1905 if (!cm_id_priv) 1906 return -EINVAL; 1907 1908 spin_lock_irq(&cm_id_priv->lock); 1909 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1910 spin_unlock_irq(&cm_id_priv->lock); 1911 goto out; 1912 } 1913 1914 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1915 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1916 if (!ret) 1917 list_add_tail(&work->list, &cm_id_priv->work_list); 1918 spin_unlock_irq(&cm_id_priv->lock); 1919 1920 if (ret) 1921 cm_process_work(cm_id_priv, work); 1922 else 1923 cm_deref_id(cm_id_priv); 1924 return 0; 1925out: 1926 cm_deref_id(cm_id_priv); 1927 return -EINVAL; 1928} 1929 1930static int cm_rtu_handler(struct cm_work *work) 1931{ 1932 struct cm_id_private *cm_id_priv; 1933 struct cm_rtu_msg *rtu_msg; 1934 int ret; 1935 1936 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1937 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1938 rtu_msg->local_comm_id); 1939 if (!cm_id_priv) 1940 return -EINVAL; 1941 1942 work->cm_event.private_data = &rtu_msg->private_data; 1943 1944 spin_lock_irq(&cm_id_priv->lock); 1945 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1946 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1947 spin_unlock_irq(&cm_id_priv->lock); 1948 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1949 counter[CM_RTU_COUNTER]); 1950 goto out; 1951 } 1952 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1953 1954 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1955 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1956 if (!ret) 1957 list_add_tail(&work->list, &cm_id_priv->work_list); 1958 spin_unlock_irq(&cm_id_priv->lock); 1959 1960 if (ret) 1961 cm_process_work(cm_id_priv, work); 1962 else 1963 cm_deref_id(cm_id_priv); 1964 return 0; 1965out: 1966 cm_deref_id(cm_id_priv); 1967 return -EINVAL; 1968} 1969 1970static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1971 struct cm_id_private *cm_id_priv, 1972 const void *private_data, 1973 u8 private_data_len) 1974{ 1975 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1976 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1977 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1978 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1979 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1980 1981 if (private_data && private_data_len) 1982 memcpy(dreq_msg->private_data, private_data, private_data_len); 1983} 1984 1985int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1986 const void *private_data, 1987 u8 private_data_len) 1988{ 1989 struct cm_id_private *cm_id_priv; 1990 struct ib_mad_send_buf *msg; 1991 unsigned long flags; 1992 int ret; 1993 1994 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1995 return -EINVAL; 1996 1997 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1998 spin_lock_irqsave(&cm_id_priv->lock, flags); 1999 if (cm_id->state != IB_CM_ESTABLISHED) { 2000 ret = -EINVAL; 2001 goto out; 2002 } 2003 2004 if (cm_id->lap_state == IB_CM_LAP_SENT || 2005 cm_id->lap_state == IB_CM_MRA_LAP_RCVD) 2006 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2007 2008 ret = cm_alloc_msg(cm_id_priv, &msg); 2009 if (ret) { 2010 cm_enter_timewait(cm_id_priv); 2011 goto out; 2012 } 2013 2014 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 2015 private_data, private_data_len); 2016 msg->timeout_ms = cm_id_priv->timeout_ms; 2017 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 2018 2019 ret = ib_post_send_mad(msg, NULL); 2020 if (ret) { 2021 cm_enter_timewait(cm_id_priv); 2022 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2023 cm_free_msg(msg); 2024 return ret; 2025 } 2026 2027 cm_id->state = IB_CM_DREQ_SENT; 2028 cm_id_priv->msg = msg; 2029out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2030 return ret; 2031} 2032EXPORT_SYMBOL(ib_send_cm_dreq); 2033 2034static void cm_format_drep(struct cm_drep_msg *drep_msg, 2035 struct cm_id_private *cm_id_priv, 2036 const void *private_data, 2037 u8 private_data_len) 2038{ 2039 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 2040 drep_msg->local_comm_id = cm_id_priv->id.local_id; 2041 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 2042 2043 if (private_data && private_data_len) 2044 memcpy(drep_msg->private_data, private_data, private_data_len); 2045} 2046 2047int ib_send_cm_drep(struct ib_cm_id *cm_id, 2048 const void *private_data, 2049 u8 private_data_len) 2050{ 2051 struct cm_id_private *cm_id_priv; 2052 struct ib_mad_send_buf *msg; 2053 unsigned long flags; 2054 void *data; 2055 int ret; 2056 2057 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 2058 return -EINVAL; 2059 2060 data = cm_copy_private_data(private_data, private_data_len); 2061 if (IS_ERR(data)) 2062 return PTR_ERR(data); 2063 2064 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2065 spin_lock_irqsave(&cm_id_priv->lock, flags); 2066 if (cm_id->state != IB_CM_DREQ_RCVD) { 2067 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2068 kfree(data); 2069 return -EINVAL; 2070 } 2071 2072 cm_set_private_data(cm_id_priv, data, private_data_len); 2073 cm_enter_timewait(cm_id_priv); 2074 2075 ret = cm_alloc_msg(cm_id_priv, &msg); 2076 if (ret) 2077 goto out; 2078 2079 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2080 private_data, private_data_len); 2081 2082 ret = ib_post_send_mad(msg, NULL); 2083 if (ret) { 2084 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2085 cm_free_msg(msg); 2086 return ret; 2087 } 2088 2089out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2090 return ret; 2091} 2092EXPORT_SYMBOL(ib_send_cm_drep); 2093 2094static int cm_issue_drep(struct cm_port *port, 2095 struct ib_mad_recv_wc *mad_recv_wc) 2096{ 2097 struct ib_mad_send_buf *msg = NULL; 2098 struct cm_dreq_msg *dreq_msg; 2099 struct cm_drep_msg *drep_msg; 2100 int ret; 2101 2102 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2103 if (ret) 2104 return ret; 2105 2106 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2107 drep_msg = (struct cm_drep_msg *) msg->mad; 2108 2109 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2110 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2111 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2112 2113 ret = ib_post_send_mad(msg, NULL); 2114 if (ret) 2115 cm_free_msg(msg); 2116 2117 return ret; 2118} 2119 2120static int cm_dreq_handler(struct cm_work *work) 2121{ 2122 struct cm_id_private *cm_id_priv; 2123 struct cm_dreq_msg *dreq_msg; 2124 struct ib_mad_send_buf *msg = NULL; 2125 int ret; 2126 2127 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2128 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2129 dreq_msg->local_comm_id); 2130 if (!cm_id_priv) { 2131 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2132 counter[CM_DREQ_COUNTER]); 2133 cm_issue_drep(work->port, work->mad_recv_wc); 2134 return -EINVAL; 2135 } 2136 2137 work->cm_event.private_data = &dreq_msg->private_data; 2138 2139 spin_lock_irq(&cm_id_priv->lock); 2140 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2141 goto unlock; 2142 2143 switch (cm_id_priv->id.state) { 2144 case IB_CM_REP_SENT: 2145 case IB_CM_DREQ_SENT: 2146 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2147 break; 2148 case IB_CM_ESTABLISHED: 2149 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT || 2150 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2151 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2152 break; 2153 case IB_CM_MRA_REP_RCVD: 2154 break; 2155 case IB_CM_TIMEWAIT: 2156 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2157 counter[CM_DREQ_COUNTER]); 2158 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2159 goto unlock; 2160 2161 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2162 cm_id_priv->private_data, 2163 cm_id_priv->private_data_len); 2164 spin_unlock_irq(&cm_id_priv->lock); 2165 2166 if (ib_post_send_mad(msg, NULL)) 2167 cm_free_msg(msg); 2168 goto deref; 2169 case IB_CM_DREQ_RCVD: 2170 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2171 counter[CM_DREQ_COUNTER]); 2172 goto unlock; 2173 default: 2174 goto unlock; 2175 } 2176 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2177 cm_id_priv->tid = dreq_msg->hdr.tid; 2178 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2179 if (!ret) 2180 list_add_tail(&work->list, &cm_id_priv->work_list); 2181 spin_unlock_irq(&cm_id_priv->lock); 2182 2183 if (ret) 2184 cm_process_work(cm_id_priv, work); 2185 else 2186 cm_deref_id(cm_id_priv); 2187 return 0; 2188 2189unlock: spin_unlock_irq(&cm_id_priv->lock); 2190deref: cm_deref_id(cm_id_priv); 2191 return -EINVAL; 2192} 2193 2194static int cm_drep_handler(struct cm_work *work) 2195{ 2196 struct cm_id_private *cm_id_priv; 2197 struct cm_drep_msg *drep_msg; 2198 int ret; 2199 2200 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2201 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2202 drep_msg->local_comm_id); 2203 if (!cm_id_priv) 2204 return -EINVAL; 2205 2206 work->cm_event.private_data = &drep_msg->private_data; 2207 2208 spin_lock_irq(&cm_id_priv->lock); 2209 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2210 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2211 spin_unlock_irq(&cm_id_priv->lock); 2212 goto out; 2213 } 2214 cm_enter_timewait(cm_id_priv); 2215 2216 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2217 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2218 if (!ret) 2219 list_add_tail(&work->list, &cm_id_priv->work_list); 2220 spin_unlock_irq(&cm_id_priv->lock); 2221 2222 if (ret) 2223 cm_process_work(cm_id_priv, work); 2224 else 2225 cm_deref_id(cm_id_priv); 2226 return 0; 2227out: 2228 cm_deref_id(cm_id_priv); 2229 return -EINVAL; 2230} 2231 2232int ib_send_cm_rej(struct ib_cm_id *cm_id, 2233 enum ib_cm_rej_reason reason, 2234 void *ari, 2235 u8 ari_length, 2236 const void *private_data, 2237 u8 private_data_len) 2238{ 2239 struct cm_id_private *cm_id_priv; 2240 struct ib_mad_send_buf *msg; 2241 unsigned long flags; 2242 int ret; 2243 2244 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2245 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2246 return -EINVAL; 2247 2248 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2249 2250 spin_lock_irqsave(&cm_id_priv->lock, flags); 2251 switch (cm_id->state) { 2252 case IB_CM_REQ_SENT: 2253 case IB_CM_MRA_REQ_RCVD: 2254 case IB_CM_REQ_RCVD: 2255 case IB_CM_MRA_REQ_SENT: 2256 case IB_CM_REP_RCVD: 2257 case IB_CM_MRA_REP_SENT: 2258 ret = cm_alloc_msg(cm_id_priv, &msg); 2259 if (!ret) 2260 cm_format_rej((struct cm_rej_msg *) msg->mad, 2261 cm_id_priv, reason, ari, ari_length, 2262 private_data, private_data_len); 2263 2264 cm_reset_to_idle(cm_id_priv); 2265 break; 2266 case IB_CM_REP_SENT: 2267 case IB_CM_MRA_REP_RCVD: 2268 ret = cm_alloc_msg(cm_id_priv, &msg); 2269 if (!ret) 2270 cm_format_rej((struct cm_rej_msg *) msg->mad, 2271 cm_id_priv, reason, ari, ari_length, 2272 private_data, private_data_len); 2273 2274 cm_enter_timewait(cm_id_priv); 2275 break; 2276 default: 2277 ret = -EINVAL; 2278 goto out; 2279 } 2280 2281 if (ret) 2282 goto out; 2283 2284 ret = ib_post_send_mad(msg, NULL); 2285 if (ret) 2286 cm_free_msg(msg); 2287 2288out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2289 return ret; 2290} 2291EXPORT_SYMBOL(ib_send_cm_rej); 2292 2293static void cm_format_rej_event(struct cm_work *work) 2294{ 2295 struct cm_rej_msg *rej_msg; 2296 struct ib_cm_rej_event_param *param; 2297 2298 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2299 param = &work->cm_event.param.rej_rcvd; 2300 param->ari = rej_msg->ari; 2301 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2302 param->reason = __be16_to_cpu(rej_msg->reason); 2303 work->cm_event.private_data = &rej_msg->private_data; 2304} 2305 2306static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2307{ 2308 struct cm_timewait_info *timewait_info; 2309 struct cm_id_private *cm_id_priv; 2310 __be32 remote_id; 2311 2312 remote_id = rej_msg->local_comm_id; 2313 2314 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2315 spin_lock_irq(&cm.lock); 2316 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2317 remote_id); 2318 if (!timewait_info) { 2319 spin_unlock_irq(&cm.lock); 2320 return NULL; 2321 } 2322 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2323 (timewait_info->work.local_id ^ 2324 cm.random_id_operand)); 2325 if (cm_id_priv) { 2326 if (cm_id_priv->id.remote_id == remote_id) 2327 atomic_inc(&cm_id_priv->refcount); 2328 else 2329 cm_id_priv = NULL; 2330 } 2331 spin_unlock_irq(&cm.lock); 2332 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2333 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2334 else 2335 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2336 2337 return cm_id_priv; 2338} 2339 2340static int cm_rej_handler(struct cm_work *work) 2341{ 2342 struct cm_id_private *cm_id_priv; 2343 struct cm_rej_msg *rej_msg; 2344 int ret; 2345 2346 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2347 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2348 if (!cm_id_priv) 2349 return -EINVAL; 2350 2351 cm_format_rej_event(work); 2352 2353 spin_lock_irq(&cm_id_priv->lock); 2354 switch (cm_id_priv->id.state) { 2355 case IB_CM_REQ_SENT: 2356 case IB_CM_MRA_REQ_RCVD: 2357 case IB_CM_REP_SENT: 2358 case IB_CM_MRA_REP_RCVD: 2359 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2360 /* fall through */ 2361 case IB_CM_REQ_RCVD: 2362 case IB_CM_MRA_REQ_SENT: 2363 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2364 cm_enter_timewait(cm_id_priv); 2365 else 2366 cm_reset_to_idle(cm_id_priv); 2367 break; 2368 case IB_CM_DREQ_SENT: 2369 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2370 /* fall through */ 2371 case IB_CM_REP_RCVD: 2372 case IB_CM_MRA_REP_SENT: 2373 cm_enter_timewait(cm_id_priv); 2374 break; 2375 case IB_CM_ESTABLISHED: 2376 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT || 2377 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) { 2378 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT) 2379 ib_cancel_mad(cm_id_priv->av.port->mad_agent, 2380 cm_id_priv->msg); 2381 cm_enter_timewait(cm_id_priv); 2382 break; 2383 } 2384 /* fall through */ 2385 default: 2386 spin_unlock_irq(&cm_id_priv->lock); 2387 ret = -EINVAL; 2388 goto out; 2389 } 2390 2391 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2392 if (!ret) 2393 list_add_tail(&work->list, &cm_id_priv->work_list); 2394 spin_unlock_irq(&cm_id_priv->lock); 2395 2396 if (ret) 2397 cm_process_work(cm_id_priv, work); 2398 else 2399 cm_deref_id(cm_id_priv); 2400 return 0; 2401out: 2402 cm_deref_id(cm_id_priv); 2403 return -EINVAL; 2404} 2405 2406int ib_send_cm_mra(struct ib_cm_id *cm_id, 2407 u8 service_timeout, 2408 const void *private_data, 2409 u8 private_data_len) 2410{ 2411 struct cm_id_private *cm_id_priv; 2412 struct ib_mad_send_buf *msg; 2413 enum ib_cm_state cm_state; 2414 enum ib_cm_lap_state lap_state; 2415 enum cm_msg_response msg_response; 2416 void *data; 2417 unsigned long flags; 2418 int ret; 2419 2420 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2421 return -EINVAL; 2422 2423 data = cm_copy_private_data(private_data, private_data_len); 2424 if (IS_ERR(data)) 2425 return PTR_ERR(data); 2426 2427 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2428 2429 spin_lock_irqsave(&cm_id_priv->lock, flags); 2430 switch(cm_id_priv->id.state) { 2431 case IB_CM_REQ_RCVD: 2432 cm_state = IB_CM_MRA_REQ_SENT; 2433 lap_state = cm_id->lap_state; 2434 msg_response = CM_MSG_RESPONSE_REQ; 2435 break; 2436 case IB_CM_REP_RCVD: 2437 cm_state = IB_CM_MRA_REP_SENT; 2438 lap_state = cm_id->lap_state; 2439 msg_response = CM_MSG_RESPONSE_REP; 2440 break; 2441 case IB_CM_ESTABLISHED: 2442 if (cm_id->lap_state == IB_CM_LAP_RCVD) { 2443 cm_state = cm_id->state; 2444 lap_state = IB_CM_MRA_LAP_SENT; 2445 msg_response = CM_MSG_RESPONSE_OTHER; 2446 break; 2447 } 2448 default: 2449 ret = -EINVAL; 2450 goto error1; 2451 } 2452 2453 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2454 ret = cm_alloc_msg(cm_id_priv, &msg); 2455 if (ret) 2456 goto error1; 2457 2458 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2459 msg_response, service_timeout, 2460 private_data, private_data_len); 2461 ret = ib_post_send_mad(msg, NULL); 2462 if (ret) 2463 goto error2; 2464 } 2465 2466 cm_id->state = cm_state; 2467 cm_id->lap_state = lap_state; 2468 cm_id_priv->service_timeout = service_timeout; 2469 cm_set_private_data(cm_id_priv, data, private_data_len); 2470 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2471 return 0; 2472 2473error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2474 kfree(data); 2475 return ret; 2476 2477error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2478 kfree(data); 2479 cm_free_msg(msg); 2480 return ret; 2481} 2482EXPORT_SYMBOL(ib_send_cm_mra); 2483 2484static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2485{ 2486 switch (cm_mra_get_msg_mraed(mra_msg)) { 2487 case CM_MSG_RESPONSE_REQ: 2488 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2489 case CM_MSG_RESPONSE_REP: 2490 case CM_MSG_RESPONSE_OTHER: 2491 return cm_acquire_id(mra_msg->remote_comm_id, 2492 mra_msg->local_comm_id); 2493 default: 2494 return NULL; 2495 } 2496} 2497 2498static int cm_mra_handler(struct cm_work *work) 2499{ 2500 struct cm_id_private *cm_id_priv; 2501 struct cm_mra_msg *mra_msg; 2502 int timeout, ret; 2503 2504 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2505 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2506 if (!cm_id_priv) 2507 return -EINVAL; 2508 2509 work->cm_event.private_data = &mra_msg->private_data; 2510 work->cm_event.param.mra_rcvd.service_timeout = 2511 cm_mra_get_service_timeout(mra_msg); 2512 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2513 cm_convert_to_ms(cm_id_priv->av.timeout); 2514 2515 spin_lock_irq(&cm_id_priv->lock); 2516 switch (cm_id_priv->id.state) { 2517 case IB_CM_REQ_SENT: 2518 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2519 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2520 cm_id_priv->msg, timeout)) 2521 goto out; 2522 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2523 break; 2524 case IB_CM_REP_SENT: 2525 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2526 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2527 cm_id_priv->msg, timeout)) 2528 goto out; 2529 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2530 break; 2531 case IB_CM_ESTABLISHED: 2532 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2533 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2534 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2535 cm_id_priv->msg, timeout)) { 2536 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2537 atomic_long_inc(&work->port-> 2538 counter_group[CM_RECV_DUPLICATES]. 2539 counter[CM_MRA_COUNTER]); 2540 goto out; 2541 } 2542 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2543 break; 2544 case IB_CM_MRA_REQ_RCVD: 2545 case IB_CM_MRA_REP_RCVD: 2546 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2547 counter[CM_MRA_COUNTER]); 2548 /* fall through */ 2549 default: 2550 goto out; 2551 } 2552 2553 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2554 cm_id_priv->id.state; 2555 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2556 if (!ret) 2557 list_add_tail(&work->list, &cm_id_priv->work_list); 2558 spin_unlock_irq(&cm_id_priv->lock); 2559 2560 if (ret) 2561 cm_process_work(cm_id_priv, work); 2562 else 2563 cm_deref_id(cm_id_priv); 2564 return 0; 2565out: 2566 spin_unlock_irq(&cm_id_priv->lock); 2567 cm_deref_id(cm_id_priv); 2568 return -EINVAL; 2569} 2570 2571static void cm_format_lap(struct cm_lap_msg *lap_msg, 2572 struct cm_id_private *cm_id_priv, 2573 struct ib_sa_path_rec *alternate_path, 2574 const void *private_data, 2575 u8 private_data_len) 2576{ 2577 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2578 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2579 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2580 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2581 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2582 /* todo: need remote CM response timeout */ 2583 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2584 lap_msg->alt_local_lid = alternate_path->slid; 2585 lap_msg->alt_remote_lid = alternate_path->dlid; 2586 lap_msg->alt_local_gid = alternate_path->sgid; 2587 lap_msg->alt_remote_gid = alternate_path->dgid; 2588 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2589 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2590 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2591 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2592 cm_lap_set_sl(lap_msg, alternate_path->sl); 2593 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2594 cm_lap_set_local_ack_timeout(lap_msg, 2595 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2596 alternate_path->packet_life_time)); 2597 2598 if (private_data && private_data_len) 2599 memcpy(lap_msg->private_data, private_data, private_data_len); 2600} 2601 2602int ib_send_cm_lap(struct ib_cm_id *cm_id, 2603 struct ib_sa_path_rec *alternate_path, 2604 const void *private_data, 2605 u8 private_data_len) 2606{ 2607 struct cm_id_private *cm_id_priv; 2608 struct ib_mad_send_buf *msg; 2609 unsigned long flags; 2610 int ret; 2611 2612 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2613 return -EINVAL; 2614 2615 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2616 spin_lock_irqsave(&cm_id_priv->lock, flags); 2617 if (cm_id->state != IB_CM_ESTABLISHED || 2618 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2619 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2620 ret = -EINVAL; 2621 goto out; 2622 } 2623 2624 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2625 if (ret) 2626 goto out; 2627 cm_id_priv->alt_av.timeout = 2628 cm_ack_timeout(cm_id_priv->target_ack_delay, 2629 cm_id_priv->alt_av.timeout - 1); 2630 2631 ret = cm_alloc_msg(cm_id_priv, &msg); 2632 if (ret) 2633 goto out; 2634 2635 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2636 alternate_path, private_data, private_data_len); 2637 msg->timeout_ms = cm_id_priv->timeout_ms; 2638 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2639 2640 ret = ib_post_send_mad(msg, NULL); 2641 if (ret) { 2642 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2643 cm_free_msg(msg); 2644 return ret; 2645 } 2646 2647 cm_id->lap_state = IB_CM_LAP_SENT; 2648 cm_id_priv->msg = msg; 2649 2650out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2651 return ret; 2652} 2653EXPORT_SYMBOL(ib_send_cm_lap); 2654 2655static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2656 struct ib_sa_path_rec *path, 2657 struct cm_lap_msg *lap_msg) 2658{ 2659 memset(path, 0, sizeof *path); 2660 path->dgid = lap_msg->alt_local_gid; 2661 path->sgid = lap_msg->alt_remote_gid; 2662 path->dlid = lap_msg->alt_local_lid; 2663 path->slid = lap_msg->alt_remote_lid; 2664 path->flow_label = cm_lap_get_flow_label(lap_msg); 2665 path->hop_limit = lap_msg->alt_hop_limit; 2666 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2667 path->reversible = 1; 2668 path->pkey = cm_id_priv->pkey; 2669 path->sl = cm_lap_get_sl(lap_msg); 2670 path->mtu_selector = IB_SA_EQ; 2671 path->mtu = cm_id_priv->path_mtu; 2672 path->rate_selector = IB_SA_EQ; 2673 path->rate = cm_lap_get_packet_rate(lap_msg); 2674 path->packet_life_time_selector = IB_SA_EQ; 2675 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2676 path->packet_life_time -= (path->packet_life_time > 0); 2677} 2678 2679static int cm_lap_handler(struct cm_work *work) 2680{ 2681 struct cm_id_private *cm_id_priv; 2682 struct cm_lap_msg *lap_msg; 2683 struct ib_cm_lap_event_param *param; 2684 struct ib_mad_send_buf *msg = NULL; 2685 int ret; 2686 2687 /* todo: verify LAP request and send reject APR if invalid. */ 2688 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2689 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2690 lap_msg->local_comm_id); 2691 if (!cm_id_priv) 2692 return -EINVAL; 2693 2694 param = &work->cm_event.param.lap_rcvd; 2695 param->alternate_path = &work->path[0]; 2696 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2697 work->cm_event.private_data = &lap_msg->private_data; 2698 2699 spin_lock_irq(&cm_id_priv->lock); 2700 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2701 goto unlock; 2702 2703 switch (cm_id_priv->id.lap_state) { 2704 case IB_CM_LAP_UNINIT: 2705 case IB_CM_LAP_IDLE: 2706 break; 2707 case IB_CM_MRA_LAP_SENT: 2708 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2709 counter[CM_LAP_COUNTER]); 2710 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2711 goto unlock; 2712 2713 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2714 CM_MSG_RESPONSE_OTHER, 2715 cm_id_priv->service_timeout, 2716 cm_id_priv->private_data, 2717 cm_id_priv->private_data_len); 2718 spin_unlock_irq(&cm_id_priv->lock); 2719 2720 if (ib_post_send_mad(msg, NULL)) 2721 cm_free_msg(msg); 2722 goto deref; 2723 case IB_CM_LAP_RCVD: 2724 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2725 counter[CM_LAP_COUNTER]); 2726 goto unlock; 2727 default: 2728 goto unlock; 2729 } 2730 2731 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2732 cm_id_priv->tid = lap_msg->hdr.tid; 2733 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2734 work->mad_recv_wc->recv_buf.grh, 2735 &cm_id_priv->av); 2736 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2737 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2738 if (!ret) 2739 list_add_tail(&work->list, &cm_id_priv->work_list); 2740 spin_unlock_irq(&cm_id_priv->lock); 2741 2742 if (ret) 2743 cm_process_work(cm_id_priv, work); 2744 else 2745 cm_deref_id(cm_id_priv); 2746 return 0; 2747 2748unlock: spin_unlock_irq(&cm_id_priv->lock); 2749deref: cm_deref_id(cm_id_priv); 2750 return -EINVAL; 2751} 2752 2753static void cm_format_apr(struct cm_apr_msg *apr_msg, 2754 struct cm_id_private *cm_id_priv, 2755 enum ib_cm_apr_status status, 2756 void *info, 2757 u8 info_length, 2758 const void *private_data, 2759 u8 private_data_len) 2760{ 2761 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2762 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2763 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2764 apr_msg->ap_status = (u8) status; 2765 2766 if (info && info_length) { 2767 apr_msg->info_length = info_length; 2768 memcpy(apr_msg->info, info, info_length); 2769 } 2770 2771 if (private_data && private_data_len) 2772 memcpy(apr_msg->private_data, private_data, private_data_len); 2773} 2774 2775int ib_send_cm_apr(struct ib_cm_id *cm_id, 2776 enum ib_cm_apr_status status, 2777 void *info, 2778 u8 info_length, 2779 const void *private_data, 2780 u8 private_data_len) 2781{ 2782 struct cm_id_private *cm_id_priv; 2783 struct ib_mad_send_buf *msg; 2784 unsigned long flags; 2785 int ret; 2786 2787 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2788 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2789 return -EINVAL; 2790 2791 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2792 spin_lock_irqsave(&cm_id_priv->lock, flags); 2793 if (cm_id->state != IB_CM_ESTABLISHED || 2794 (cm_id->lap_state != IB_CM_LAP_RCVD && 2795 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2796 ret = -EINVAL; 2797 goto out; 2798 } 2799 2800 ret = cm_alloc_msg(cm_id_priv, &msg); 2801 if (ret) 2802 goto out; 2803 2804 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2805 info, info_length, private_data, private_data_len); 2806 ret = ib_post_send_mad(msg, NULL); 2807 if (ret) { 2808 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2809 cm_free_msg(msg); 2810 return ret; 2811 } 2812 2813 cm_id->lap_state = IB_CM_LAP_IDLE; 2814out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2815 return ret; 2816} 2817EXPORT_SYMBOL(ib_send_cm_apr); 2818 2819static int cm_apr_handler(struct cm_work *work) 2820{ 2821 struct cm_id_private *cm_id_priv; 2822 struct cm_apr_msg *apr_msg; 2823 int ret; 2824 2825 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2826 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2827 apr_msg->local_comm_id); 2828 if (!cm_id_priv) 2829 return -EINVAL; /* Unmatched reply. */ 2830 2831 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2832 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2833 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2834 work->cm_event.private_data = &apr_msg->private_data; 2835 2836 spin_lock_irq(&cm_id_priv->lock); 2837 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2838 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2839 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2840 spin_unlock_irq(&cm_id_priv->lock); 2841 goto out; 2842 } 2843 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2844 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2845 cm_id_priv->msg = NULL; 2846 2847 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2848 if (!ret) 2849 list_add_tail(&work->list, &cm_id_priv->work_list); 2850 spin_unlock_irq(&cm_id_priv->lock); 2851 2852 if (ret) 2853 cm_process_work(cm_id_priv, work); 2854 else 2855 cm_deref_id(cm_id_priv); 2856 return 0; 2857out: 2858 cm_deref_id(cm_id_priv); 2859 return -EINVAL; 2860} 2861 2862static int cm_timewait_handler(struct cm_work *work) 2863{ 2864 struct cm_timewait_info *timewait_info; 2865 struct cm_id_private *cm_id_priv; 2866 int ret; 2867 2868 timewait_info = (struct cm_timewait_info *)work; 2869 spin_lock_irq(&cm.lock); 2870 list_del(&timewait_info->list); 2871 spin_unlock_irq(&cm.lock); 2872 2873 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2874 timewait_info->work.remote_id); 2875 if (!cm_id_priv) 2876 return -EINVAL; 2877 2878 spin_lock_irq(&cm_id_priv->lock); 2879 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2880 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2881 spin_unlock_irq(&cm_id_priv->lock); 2882 goto out; 2883 } 2884 cm_id_priv->id.state = IB_CM_IDLE; 2885 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2886 if (!ret) 2887 list_add_tail(&work->list, &cm_id_priv->work_list); 2888 spin_unlock_irq(&cm_id_priv->lock); 2889 2890 if (ret) 2891 cm_process_work(cm_id_priv, work); 2892 else 2893 cm_deref_id(cm_id_priv); 2894 return 0; 2895out: 2896 cm_deref_id(cm_id_priv); 2897 return -EINVAL; 2898} 2899 2900static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2901 struct cm_id_private *cm_id_priv, 2902 struct ib_cm_sidr_req_param *param) 2903{ 2904 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2905 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2906 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2907 sidr_req_msg->pkey = param->path->pkey; 2908 sidr_req_msg->service_id = param->service_id; 2909 2910 if (param->private_data && param->private_data_len) 2911 memcpy(sidr_req_msg->private_data, param->private_data, 2912 param->private_data_len); 2913} 2914 2915int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2916 struct ib_cm_sidr_req_param *param) 2917{ 2918 struct cm_id_private *cm_id_priv; 2919 struct ib_mad_send_buf *msg; 2920 unsigned long flags; 2921 int ret; 2922 2923 if (!param->path || (param->private_data && 2924 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2925 return -EINVAL; 2926 2927 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2928 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2929 if (ret) 2930 goto out; 2931 2932 cm_id->service_id = param->service_id; 2933 cm_id->service_mask = ~cpu_to_be64(0); 2934 cm_id_priv->timeout_ms = param->timeout_ms; 2935 cm_id_priv->max_cm_retries = param->max_cm_retries; 2936 ret = cm_alloc_msg(cm_id_priv, &msg); 2937 if (ret) 2938 goto out; 2939 2940 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2941 param); 2942 msg->timeout_ms = cm_id_priv->timeout_ms; 2943 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2944 2945 spin_lock_irqsave(&cm_id_priv->lock, flags); 2946 if (cm_id->state == IB_CM_IDLE) 2947 ret = ib_post_send_mad(msg, NULL); 2948 else 2949 ret = -EINVAL; 2950 2951 if (ret) { 2952 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2953 cm_free_msg(msg); 2954 goto out; 2955 } 2956 cm_id->state = IB_CM_SIDR_REQ_SENT; 2957 cm_id_priv->msg = msg; 2958 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2959out: 2960 return ret; 2961} 2962EXPORT_SYMBOL(ib_send_cm_sidr_req); 2963 2964static void cm_format_sidr_req_event(struct cm_work *work, 2965 struct ib_cm_id *listen_id) 2966{ 2967 struct cm_sidr_req_msg *sidr_req_msg; 2968 struct ib_cm_sidr_req_event_param *param; 2969 2970 sidr_req_msg = (struct cm_sidr_req_msg *) 2971 work->mad_recv_wc->recv_buf.mad; 2972 param = &work->cm_event.param.sidr_req_rcvd; 2973 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2974 param->listen_id = listen_id; 2975 param->port = work->port->port_num; 2976 work->cm_event.private_data = &sidr_req_msg->private_data; 2977} 2978 2979static int cm_sidr_req_handler(struct cm_work *work) 2980{ 2981 struct ib_cm_id *cm_id; 2982 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2983 struct cm_sidr_req_msg *sidr_req_msg; 2984 struct ib_wc *wc; 2985 2986 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 2987 if (IS_ERR(cm_id)) 2988 return PTR_ERR(cm_id); 2989 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2990 2991 /* Record SGID/SLID and request ID for lookup. */ 2992 sidr_req_msg = (struct cm_sidr_req_msg *) 2993 work->mad_recv_wc->recv_buf.mad; 2994 wc = work->mad_recv_wc->wc; 2995 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2996 cm_id_priv->av.dgid.global.interface_id = 0; 2997 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2998 work->mad_recv_wc->recv_buf.grh, 2999 &cm_id_priv->av); 3000 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 3001 cm_id_priv->tid = sidr_req_msg->hdr.tid; 3002 atomic_inc(&cm_id_priv->work_count); 3003 3004 spin_lock_irq(&cm.lock); 3005 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 3006 if (cur_cm_id_priv) { 3007 spin_unlock_irq(&cm.lock); 3008 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 3009 counter[CM_SIDR_REQ_COUNTER]); 3010 goto out; /* Duplicate message. */ 3011 } 3012 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 3013 cur_cm_id_priv = cm_find_listen(cm_id->device, 3014 sidr_req_msg->service_id, 3015 sidr_req_msg->private_data); 3016 if (!cur_cm_id_priv) { 3017 spin_unlock_irq(&cm.lock); 3018 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 3019 goto out; /* No match. */ 3020 } 3021 atomic_inc(&cur_cm_id_priv->refcount); 3022 atomic_inc(&cm_id_priv->refcount); 3023 spin_unlock_irq(&cm.lock); 3024 3025 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 3026 cm_id_priv->id.context = cur_cm_id_priv->id.context; 3027 cm_id_priv->id.service_id = sidr_req_msg->service_id; 3028 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 3029 3030 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 3031 cm_process_work(cm_id_priv, work); 3032 cm_deref_id(cur_cm_id_priv); 3033 return 0; 3034out: 3035 ib_destroy_cm_id(&cm_id_priv->id); 3036 return -EINVAL; 3037} 3038 3039static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 3040 struct cm_id_private *cm_id_priv, 3041 struct ib_cm_sidr_rep_param *param) 3042{ 3043 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 3044 cm_id_priv->tid); 3045 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 3046 sidr_rep_msg->status = param->status; 3047 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 3048 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 3049 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 3050 3051 if (param->info && param->info_length) 3052 memcpy(sidr_rep_msg->info, param->info, param->info_length); 3053 3054 if (param->private_data && param->private_data_len) 3055 memcpy(sidr_rep_msg->private_data, param->private_data, 3056 param->private_data_len); 3057} 3058 3059int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 3060 struct ib_cm_sidr_rep_param *param) 3061{ 3062 struct cm_id_private *cm_id_priv; 3063 struct ib_mad_send_buf *msg; 3064 unsigned long flags; 3065 int ret; 3066 3067 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 3068 (param->private_data && 3069 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 3070 return -EINVAL; 3071 3072 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3073 spin_lock_irqsave(&cm_id_priv->lock, flags); 3074 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 3075 ret = -EINVAL; 3076 goto error; 3077 } 3078 3079 ret = cm_alloc_msg(cm_id_priv, &msg); 3080 if (ret) 3081 goto error; 3082 3083 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 3084 param); 3085 ret = ib_post_send_mad(msg, NULL); 3086 if (ret) { 3087 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3088 cm_free_msg(msg); 3089 return ret; 3090 } 3091 cm_id->state = IB_CM_IDLE; 3092 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3093 3094 spin_lock_irqsave(&cm.lock, flags); 3095 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 3096 spin_unlock_irqrestore(&cm.lock, flags); 3097 return 0; 3098 3099error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3100 return ret; 3101} 3102EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3103 3104static void cm_format_sidr_rep_event(struct cm_work *work) 3105{ 3106 struct cm_sidr_rep_msg *sidr_rep_msg; 3107 struct ib_cm_sidr_rep_event_param *param; 3108 3109 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3110 work->mad_recv_wc->recv_buf.mad; 3111 param = &work->cm_event.param.sidr_rep_rcvd; 3112 param->status = sidr_rep_msg->status; 3113 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3114 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3115 param->info = &sidr_rep_msg->info; 3116 param->info_len = sidr_rep_msg->info_length; 3117 work->cm_event.private_data = &sidr_rep_msg->private_data; 3118} 3119 3120static int cm_sidr_rep_handler(struct cm_work *work) 3121{ 3122 struct cm_sidr_rep_msg *sidr_rep_msg; 3123 struct cm_id_private *cm_id_priv; 3124 3125 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3126 work->mad_recv_wc->recv_buf.mad; 3127 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3128 if (!cm_id_priv) 3129 return -EINVAL; /* Unmatched reply. */ 3130 3131 spin_lock_irq(&cm_id_priv->lock); 3132 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3133 spin_unlock_irq(&cm_id_priv->lock); 3134 goto out; 3135 } 3136 cm_id_priv->id.state = IB_CM_IDLE; 3137 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3138 spin_unlock_irq(&cm_id_priv->lock); 3139 3140 cm_format_sidr_rep_event(work); 3141 cm_process_work(cm_id_priv, work); 3142 return 0; 3143out: 3144 cm_deref_id(cm_id_priv); 3145 return -EINVAL; 3146} 3147 3148static void cm_process_send_error(struct ib_mad_send_buf *msg, 3149 enum ib_wc_status wc_status) 3150{ 3151 struct cm_id_private *cm_id_priv; 3152 struct ib_cm_event cm_event; 3153 enum ib_cm_state state; 3154 int ret; 3155 3156 memset(&cm_event, 0, sizeof cm_event); 3157 cm_id_priv = msg->context[0]; 3158 3159 /* Discard old sends or ones without a response. */ 3160 spin_lock_irq(&cm_id_priv->lock); 3161 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3162 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3163 goto discard; 3164 3165 switch (state) { 3166 case IB_CM_REQ_SENT: 3167 case IB_CM_MRA_REQ_RCVD: 3168 cm_reset_to_idle(cm_id_priv); 3169 cm_event.event = IB_CM_REQ_ERROR; 3170 break; 3171 case IB_CM_REP_SENT: 3172 case IB_CM_MRA_REP_RCVD: 3173 cm_reset_to_idle(cm_id_priv); 3174 cm_event.event = IB_CM_REP_ERROR; 3175 break; 3176 case IB_CM_DREQ_SENT: 3177 cm_enter_timewait(cm_id_priv); 3178 cm_event.event = IB_CM_DREQ_ERROR; 3179 break; 3180 case IB_CM_SIDR_REQ_SENT: 3181 cm_id_priv->id.state = IB_CM_IDLE; 3182 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3183 break; 3184 default: 3185 goto discard; 3186 } 3187 spin_unlock_irq(&cm_id_priv->lock); 3188 cm_event.param.send_status = wc_status; 3189 3190 /* No other events can occur on the cm_id at this point. */ 3191 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3192 cm_free_msg(msg); 3193 if (ret) 3194 ib_destroy_cm_id(&cm_id_priv->id); 3195 return; 3196discard: 3197 spin_unlock_irq(&cm_id_priv->lock); 3198 cm_free_msg(msg); 3199} 3200 3201static void cm_send_handler(struct ib_mad_agent *mad_agent, 3202 struct ib_mad_send_wc *mad_send_wc) 3203{ 3204 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3205 struct cm_port *port; 3206 u16 attr_index; 3207 3208 port = mad_agent->context; 3209 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3210 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3211 3212 /* 3213 * If the send was in response to a received message (context[0] is not 3214 * set to a cm_id), and is not a REJ, then it is a send that was 3215 * manually retried. 3216 */ 3217 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3218 msg->retries = 1; 3219 3220 atomic_long_add(1 + msg->retries, 3221 &port->counter_group[CM_XMIT].counter[attr_index]); 3222 if (msg->retries) 3223 atomic_long_add(msg->retries, 3224 &port->counter_group[CM_XMIT_RETRIES]. 3225 counter[attr_index]); 3226 3227 switch (mad_send_wc->status) { 3228 case IB_WC_SUCCESS: 3229 case IB_WC_WR_FLUSH_ERR: 3230 cm_free_msg(msg); 3231 break; 3232 default: 3233 if (msg->context[0] && msg->context[1]) 3234 cm_process_send_error(msg, mad_send_wc->status); 3235 else 3236 cm_free_msg(msg); 3237 break; 3238 } 3239} 3240 3241static void cm_work_handler(struct work_struct *_work) 3242{ 3243 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3244 int ret; 3245 3246 switch (work->cm_event.event) { 3247 case IB_CM_REQ_RECEIVED: 3248 ret = cm_req_handler(work); 3249 break; 3250 case IB_CM_MRA_RECEIVED: 3251 ret = cm_mra_handler(work); 3252 break; 3253 case IB_CM_REJ_RECEIVED: 3254 ret = cm_rej_handler(work); 3255 break; 3256 case IB_CM_REP_RECEIVED: 3257 ret = cm_rep_handler(work); 3258 break; 3259 case IB_CM_RTU_RECEIVED: 3260 ret = cm_rtu_handler(work); 3261 break; 3262 case IB_CM_USER_ESTABLISHED: 3263 ret = cm_establish_handler(work); 3264 break; 3265 case IB_CM_DREQ_RECEIVED: 3266 ret = cm_dreq_handler(work); 3267 break; 3268 case IB_CM_DREP_RECEIVED: 3269 ret = cm_drep_handler(work); 3270 break; 3271 case IB_CM_SIDR_REQ_RECEIVED: 3272 ret = cm_sidr_req_handler(work); 3273 break; 3274 case IB_CM_SIDR_REP_RECEIVED: 3275 ret = cm_sidr_rep_handler(work); 3276 break; 3277 case IB_CM_LAP_RECEIVED: 3278 ret = cm_lap_handler(work); 3279 break; 3280 case IB_CM_APR_RECEIVED: 3281 ret = cm_apr_handler(work); 3282 break; 3283 case IB_CM_TIMEWAIT_EXIT: 3284 ret = cm_timewait_handler(work); 3285 break; 3286 default: 3287 ret = -EINVAL; 3288 break; 3289 } 3290 if (ret) 3291 cm_free_work(work); 3292} 3293 3294static int cm_establish(struct ib_cm_id *cm_id) 3295{ 3296 struct cm_id_private *cm_id_priv; 3297 struct cm_work *work; 3298 unsigned long flags; 3299 int ret = 0; 3300 3301 work = kmalloc(sizeof *work, GFP_ATOMIC); 3302 if (!work) 3303 return -ENOMEM; 3304 3305 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3306 spin_lock_irqsave(&cm_id_priv->lock, flags); 3307 switch (cm_id->state) 3308 { 3309 case IB_CM_REP_SENT: 3310 case IB_CM_MRA_REP_RCVD: 3311 cm_id->state = IB_CM_ESTABLISHED; 3312 break; 3313 case IB_CM_ESTABLISHED: 3314 ret = -EISCONN; 3315 break; 3316 default: 3317 ret = -EINVAL; 3318 break; 3319 } 3320 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3321 3322 if (ret) { 3323 kfree(work); 3324 goto out; 3325 } 3326 3327 /* 3328 * The CM worker thread may try to destroy the cm_id before it 3329 * can execute this work item. To prevent potential deadlock, 3330 * we need to find the cm_id once we're in the context of the 3331 * worker thread, rather than holding a reference on it. 3332 */ 3333 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3334 work->local_id = cm_id->local_id; 3335 work->remote_id = cm_id->remote_id; 3336 work->mad_recv_wc = NULL; 3337 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3338 queue_delayed_work(cm.wq, &work->work, 0); 3339out: 3340 return ret; 3341} 3342 3343static int cm_migrate(struct ib_cm_id *cm_id) 3344{ 3345 struct cm_id_private *cm_id_priv; 3346 unsigned long flags; 3347 int ret = 0; 3348 3349 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3350 spin_lock_irqsave(&cm_id_priv->lock, flags); 3351 if (cm_id->state == IB_CM_ESTABLISHED && 3352 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3353 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3354 cm_id->lap_state = IB_CM_LAP_IDLE; 3355 cm_id_priv->av = cm_id_priv->alt_av; 3356 } else 3357 ret = -EINVAL; 3358 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3359 3360 return ret; 3361} 3362 3363int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3364{ 3365 int ret; 3366 3367 switch (event) { 3368 case IB_EVENT_COMM_EST: 3369 ret = cm_establish(cm_id); 3370 break; 3371 case IB_EVENT_PATH_MIG: 3372 ret = cm_migrate(cm_id); 3373 break; 3374 default: 3375 ret = -EINVAL; 3376 } 3377 return ret; 3378} 3379EXPORT_SYMBOL(ib_cm_notify); 3380 3381static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3382 struct ib_mad_recv_wc *mad_recv_wc) 3383{ 3384 struct cm_port *port = mad_agent->context; 3385 struct cm_work *work; 3386 enum ib_cm_event_type event; 3387 u16 attr_id; 3388 int paths = 0; 3389 3390 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3391 case CM_REQ_ATTR_ID: 3392 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3393 alt_local_lid != 0); 3394 event = IB_CM_REQ_RECEIVED; 3395 break; 3396 case CM_MRA_ATTR_ID: 3397 event = IB_CM_MRA_RECEIVED; 3398 break; 3399 case CM_REJ_ATTR_ID: 3400 event = IB_CM_REJ_RECEIVED; 3401 break; 3402 case CM_REP_ATTR_ID: 3403 event = IB_CM_REP_RECEIVED; 3404 break; 3405 case CM_RTU_ATTR_ID: 3406 event = IB_CM_RTU_RECEIVED; 3407 break; 3408 case CM_DREQ_ATTR_ID: 3409 event = IB_CM_DREQ_RECEIVED; 3410 break; 3411 case CM_DREP_ATTR_ID: 3412 event = IB_CM_DREP_RECEIVED; 3413 break; 3414 case CM_SIDR_REQ_ATTR_ID: 3415 event = IB_CM_SIDR_REQ_RECEIVED; 3416 break; 3417 case CM_SIDR_REP_ATTR_ID: 3418 event = IB_CM_SIDR_REP_RECEIVED; 3419 break; 3420 case CM_LAP_ATTR_ID: 3421 paths = 1; 3422 event = IB_CM_LAP_RECEIVED; 3423 break; 3424 case CM_APR_ATTR_ID: 3425 event = IB_CM_APR_RECEIVED; 3426 break; 3427 default: 3428 ib_free_recv_mad(mad_recv_wc); 3429 return; 3430 } 3431 3432 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3433 atomic_long_inc(&port->counter_group[CM_RECV]. 3434 counter[attr_id - CM_ATTR_ID_OFFSET]); 3435 3436 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3437 GFP_KERNEL); 3438 if (!work) { 3439 ib_free_recv_mad(mad_recv_wc); 3440 return; 3441 } 3442 3443 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3444 work->cm_event.event = event; 3445 work->mad_recv_wc = mad_recv_wc; 3446 work->port = port; 3447 queue_delayed_work(cm.wq, &work->work, 0); 3448} 3449 3450static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3451 struct ib_qp_attr *qp_attr, 3452 int *qp_attr_mask) 3453{ 3454 unsigned long flags; 3455 int ret; 3456 3457 spin_lock_irqsave(&cm_id_priv->lock, flags); 3458 switch (cm_id_priv->id.state) { 3459 case IB_CM_REQ_SENT: 3460 case IB_CM_MRA_REQ_RCVD: 3461 case IB_CM_REQ_RCVD: 3462 case IB_CM_MRA_REQ_SENT: 3463 case IB_CM_REP_RCVD: 3464 case IB_CM_MRA_REP_SENT: 3465 case IB_CM_REP_SENT: 3466 case IB_CM_MRA_REP_RCVD: 3467 case IB_CM_ESTABLISHED: 3468 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3469 IB_QP_PKEY_INDEX | IB_QP_PORT; 3470 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3471 if (cm_id_priv->responder_resources) 3472 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3473 IB_ACCESS_REMOTE_ATOMIC; 3474 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3475 qp_attr->port_num = cm_id_priv->av.port->port_num; 3476 ret = 0; 3477 break; 3478 default: 3479 ret = -EINVAL; 3480 break; 3481 } 3482 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3483 return ret; 3484} 3485 3486static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3487 struct ib_qp_attr *qp_attr, 3488 int *qp_attr_mask) 3489{ 3490 unsigned long flags; 3491 int ret; 3492 3493 spin_lock_irqsave(&cm_id_priv->lock, flags); 3494 switch (cm_id_priv->id.state) { 3495 case IB_CM_REQ_RCVD: 3496 case IB_CM_MRA_REQ_SENT: 3497 case IB_CM_REP_RCVD: 3498 case IB_CM_MRA_REP_SENT: 3499 case IB_CM_REP_SENT: 3500 case IB_CM_MRA_REP_RCVD: 3501 case IB_CM_ESTABLISHED: 3502 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3503 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3504 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3505 qp_attr->path_mtu = cm_id_priv->path_mtu; 3506 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3507 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3508 if (cm_id_priv->qp_type == IB_QPT_RC || 3509 cm_id_priv->qp_type == IB_QPT_XRC_TGT) { 3510 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3511 IB_QP_MIN_RNR_TIMER; 3512 qp_attr->max_dest_rd_atomic = 3513 cm_id_priv->responder_resources; 3514 qp_attr->min_rnr_timer = 0; 3515 } 3516 if (cm_id_priv->alt_av.ah_attr.dlid) { 3517 *qp_attr_mask |= IB_QP_ALT_PATH; 3518 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3519 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3520 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3521 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3522 } 3523 ret = 0; 3524 break; 3525 default: 3526 ret = -EINVAL; 3527 break; 3528 } 3529 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3530 return ret; 3531} 3532 3533static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3534 struct ib_qp_attr *qp_attr, 3535 int *qp_attr_mask) 3536{ 3537 unsigned long flags; 3538 int ret; 3539 3540 spin_lock_irqsave(&cm_id_priv->lock, flags); 3541 switch (cm_id_priv->id.state) { 3542 /* Allow transition to RTS before sending REP */ 3543 case IB_CM_REQ_RCVD: 3544 case IB_CM_MRA_REQ_SENT: 3545 3546 case IB_CM_REP_RCVD: 3547 case IB_CM_MRA_REP_SENT: 3548 case IB_CM_REP_SENT: 3549 case IB_CM_MRA_REP_RCVD: 3550 case IB_CM_ESTABLISHED: 3551 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3552 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3553 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3554 switch (cm_id_priv->qp_type) { 3555 case IB_QPT_RC: 3556 case IB_QPT_XRC_INI: 3557 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY | 3558 IB_QP_MAX_QP_RD_ATOMIC; 3559 qp_attr->retry_cnt = cm_id_priv->retry_count; 3560 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3561 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth; 3562 /* fall through */ 3563 case IB_QPT_XRC_TGT: 3564 *qp_attr_mask |= IB_QP_TIMEOUT; 3565 qp_attr->timeout = cm_id_priv->av.timeout; 3566 break; 3567 default: 3568 break; 3569 } 3570 if (cm_id_priv->alt_av.ah_attr.dlid) { 3571 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3572 qp_attr->path_mig_state = IB_MIG_REARM; 3573 } 3574 } else { 3575 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3576 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3577 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3578 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3579 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3580 qp_attr->path_mig_state = IB_MIG_REARM; 3581 } 3582 ret = 0; 3583 break; 3584 default: 3585 ret = -EINVAL; 3586 break; 3587 } 3588 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3589 return ret; 3590} 3591 3592int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3593 struct ib_qp_attr *qp_attr, 3594 int *qp_attr_mask) 3595{ 3596 struct cm_id_private *cm_id_priv; 3597 int ret; 3598 3599 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3600 switch (qp_attr->qp_state) { 3601 case IB_QPS_INIT: 3602 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3603 break; 3604 case IB_QPS_RTR: 3605 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3606 break; 3607 case IB_QPS_RTS: 3608 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3609 break; 3610 default: 3611 ret = -EINVAL; 3612 break; 3613 } 3614 return ret; 3615} 3616EXPORT_SYMBOL(ib_cm_init_qp_attr); 3617 3618static void cm_get_ack_delay(struct cm_device *cm_dev) 3619{ 3620 struct ib_device_attr attr; 3621 3622 if (ib_query_device(cm_dev->ib_device, &attr)) 3623 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3624 else 3625 cm_dev->ack_delay = attr.local_ca_ack_delay; 3626} 3627 3628static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3629 char *buf) 3630{ 3631 struct cm_counter_group *group; 3632 struct cm_counter_attribute *cm_attr; 3633 3634 group = container_of(obj, struct cm_counter_group, obj); 3635 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3636 3637 return sprintf(buf, "%ld\n", 3638 atomic_long_read(&group->counter[cm_attr->index])); 3639} 3640 3641static const struct sysfs_ops cm_counter_ops = { 3642 .show = cm_show_counter 3643}; 3644 3645static struct kobj_type cm_counter_obj_type = { 3646 .sysfs_ops = &cm_counter_ops, 3647 .default_attrs = cm_counter_default_attrs 3648}; 3649 3650static void cm_release_port_obj(struct kobject *obj) 3651{ 3652 struct cm_port *cm_port; 3653 3654 cm_port = container_of(obj, struct cm_port, port_obj); 3655 kfree(cm_port); 3656} 3657 3658static struct kobj_type cm_port_obj_type = { 3659 .release = cm_release_port_obj 3660}; 3661 3662static char *cm_devnode(struct device *dev, umode_t *mode) 3663{ 3664 if (mode) 3665 *mode = 0666; 3666 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 3667} 3668 3669struct class cm_class = { 3670 .owner = THIS_MODULE, 3671 .name = "infiniband_cm", 3672 .devnode = cm_devnode, 3673}; 3674EXPORT_SYMBOL(cm_class); 3675 3676static int cm_create_port_fs(struct cm_port *port) 3677{ 3678 int i, ret; 3679 3680 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3681 &port->cm_dev->device->kobj, 3682 "%d", port->port_num); 3683 if (ret) { 3684 kfree(port); 3685 return ret; 3686 } 3687 3688 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3689 ret = kobject_init_and_add(&port->counter_group[i].obj, 3690 &cm_counter_obj_type, 3691 &port->port_obj, 3692 "%s", counter_group_names[i]); 3693 if (ret) 3694 goto error; 3695 } 3696 3697 return 0; 3698 3699error: 3700 while (i--) 3701 kobject_put(&port->counter_group[i].obj); 3702 kobject_put(&port->port_obj); 3703 return ret; 3704 3705} 3706 3707static void cm_remove_port_fs(struct cm_port *port) 3708{ 3709 int i; 3710 3711 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3712 kobject_put(&port->counter_group[i].obj); 3713 3714 kobject_put(&port->port_obj); 3715} 3716 3717static void cm_add_one(struct ib_device *ib_device) 3718{ 3719 struct cm_device *cm_dev; 3720 struct cm_port *port; 3721 struct ib_mad_reg_req reg_req = { 3722 .mgmt_class = IB_MGMT_CLASS_CM, 3723 .mgmt_class_version = IB_CM_CLASS_VERSION 3724 }; 3725 struct ib_port_modify port_modify = { 3726 .set_port_cap_mask = IB_PORT_CM_SUP 3727 }; 3728 unsigned long flags; 3729 int ret; 3730 u8 i; 3731 3732 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB) 3733 return; 3734 3735 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3736 ib_device->phys_port_cnt, GFP_KERNEL); 3737 if (!cm_dev) 3738 return; 3739 3740 cm_dev->ib_device = ib_device; 3741 cm_get_ack_delay(cm_dev); 3742 3743 cm_dev->device = device_create(&cm_class, &ib_device->dev, 3744 MKDEV(0, 0), NULL, 3745 "%s", ib_device->name); 3746 if (IS_ERR(cm_dev->device)) { 3747 kfree(cm_dev); 3748 return; 3749 } 3750 3751 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3752 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3753 port = kzalloc(sizeof *port, GFP_KERNEL); 3754 if (!port) 3755 goto error1; 3756 3757 cm_dev->port[i-1] = port; 3758 port->cm_dev = cm_dev; 3759 port->port_num = i; 3760 3761 ret = cm_create_port_fs(port); 3762 if (ret) 3763 goto error1; 3764 3765 port->mad_agent = ib_register_mad_agent(ib_device, i, 3766 IB_QPT_GSI, 3767 ®_req, 3768 0, 3769 cm_send_handler, 3770 cm_recv_handler, 3771 port); 3772 if (IS_ERR(port->mad_agent)) 3773 goto error2; 3774 3775 ret = ib_modify_port(ib_device, i, 0, &port_modify); 3776 if (ret) 3777 goto error3; 3778 } 3779 ib_set_client_data(ib_device, &cm_client, cm_dev); 3780 3781 write_lock_irqsave(&cm.device_lock, flags); 3782 list_add_tail(&cm_dev->list, &cm.device_list); 3783 write_unlock_irqrestore(&cm.device_lock, flags); 3784 return; 3785 3786error3: 3787 ib_unregister_mad_agent(port->mad_agent); 3788error2: 3789 cm_remove_port_fs(port); 3790error1: 3791 port_modify.set_port_cap_mask = 0; 3792 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3793 while (--i) { 3794 port = cm_dev->port[i-1]; 3795 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3796 ib_unregister_mad_agent(port->mad_agent); 3797 cm_remove_port_fs(port); 3798 } 3799 device_unregister(cm_dev->device); 3800 kfree(cm_dev); 3801} 3802 3803static void cm_remove_one(struct ib_device *ib_device) 3804{ 3805 struct cm_device *cm_dev; 3806 struct cm_port *port; 3807 struct ib_port_modify port_modify = { 3808 .clr_port_cap_mask = IB_PORT_CM_SUP 3809 }; 3810 unsigned long flags; 3811 int i; 3812 3813 cm_dev = ib_get_client_data(ib_device, &cm_client); 3814 if (!cm_dev) 3815 return; 3816 3817 write_lock_irqsave(&cm.device_lock, flags); 3818 list_del(&cm_dev->list); 3819 write_unlock_irqrestore(&cm.device_lock, flags); 3820 3821 for (i = 1; i <= ib_device->phys_port_cnt; i++) { 3822 port = cm_dev->port[i-1]; 3823 ib_modify_port(ib_device, port->port_num, 0, &port_modify); 3824 ib_unregister_mad_agent(port->mad_agent); 3825 flush_workqueue(cm.wq); 3826 cm_remove_port_fs(port); 3827 } 3828 device_unregister(cm_dev->device); 3829 kfree(cm_dev); 3830} 3831 3832static int __init ib_cm_init(void) 3833{ 3834 int ret; 3835 3836 memset(&cm, 0, sizeof cm); 3837 INIT_LIST_HEAD(&cm.device_list); 3838 rwlock_init(&cm.device_lock); 3839 spin_lock_init(&cm.lock); 3840 cm.listen_service_table = RB_ROOT; 3841 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3842 cm.remote_id_table = RB_ROOT; 3843 cm.remote_qp_table = RB_ROOT; 3844 cm.remote_sidr_table = RB_ROOT; 3845 idr_init(&cm.local_id_table); 3846 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3847 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3848 INIT_LIST_HEAD(&cm.timewait_list); 3849 3850 ret = class_register(&cm_class); 3851 if (ret) { 3852 ret = -ENOMEM; 3853 goto error1; 3854 } 3855 3856 cm.wq = create_workqueue("ib_cm"); 3857 if (!cm.wq) { 3858 ret = -ENOMEM; 3859 goto error2; 3860 } 3861 3862 ret = ib_register_client(&cm_client); 3863 if (ret) 3864 goto error3; 3865 3866 return 0; 3867error3: 3868 destroy_workqueue(cm.wq); 3869error2: 3870 class_unregister(&cm_class); 3871error1: 3872 idr_destroy(&cm.local_id_table); 3873 return ret; 3874} 3875 3876static void __exit ib_cm_cleanup(void) 3877{ 3878 struct cm_timewait_info *timewait_info, *tmp; 3879 3880 spin_lock_irq(&cm.lock); 3881 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3882 cancel_delayed_work(&timewait_info->work.work); 3883 spin_unlock_irq(&cm.lock); 3884 3885 ib_unregister_client(&cm_client); 3886 destroy_workqueue(cm.wq); 3887 3888 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3889 list_del(&timewait_info->list); 3890 kfree(timewait_info); 3891 } 3892 3893 class_unregister(&cm_class); 3894 idr_destroy(&cm.local_id_table); 3895} 3896 3897module_init(ib_cm_init); 3898module_exit(ib_cm_cleanup); 3899 3900