/drivers/infiniband/core/cm.c
C | 3875 lines | 3297 code | 482 blank | 96 comment | 439 complexity | 9ba594543d5101f200f1c1152ab8cdaf MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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1/* 2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved. 3 * Copyright (c) 2004 Topspin Corporation. All rights reserved. 4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. 5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 */ 35 36#include <linux/completion.h> 37#include <linux/dma-mapping.h> 38#include <linux/device.h> 39#include <linux/err.h> 40#include <linux/idr.h> 41#include <linux/interrupt.h> 42#include <linux/random.h> 43#include <linux/rbtree.h> 44#include <linux/spinlock.h> 45#include <linux/slab.h> 46#include <linux/sysfs.h> 47#include <linux/workqueue.h> 48#include <linux/kdev_t.h> 49 50#include <rdma/ib_cache.h> 51#include <rdma/ib_cm.h> 52#include "cm_msgs.h" 53 54MODULE_AUTHOR("Sean Hefty"); 55MODULE_DESCRIPTION("InfiniBand CM"); 56MODULE_LICENSE("Dual BSD/GPL"); 57 58static void cm_add_one(struct ib_device *device); 59static void cm_remove_one(struct ib_device *device); 60 61static struct ib_client cm_client = { 62 .name = "cm", 63 .add = cm_add_one, 64 .remove = cm_remove_one 65}; 66 67static struct ib_cm { 68 spinlock_t lock; 69 struct list_head device_list; 70 rwlock_t device_lock; 71 struct rb_root listen_service_table; 72 u64 listen_service_id; 73 /* struct rb_root peer_service_table; todo: fix peer to peer */ 74 struct rb_root remote_qp_table; 75 struct rb_root remote_id_table; 76 struct rb_root remote_sidr_table; 77 struct idr local_id_table; 78 __be32 random_id_operand; 79 struct list_head timewait_list; 80 struct workqueue_struct *wq; 81} cm; 82 83/* Counter indexes ordered by attribute ID */ 84enum { 85 CM_REQ_COUNTER, 86 CM_MRA_COUNTER, 87 CM_REJ_COUNTER, 88 CM_REP_COUNTER, 89 CM_RTU_COUNTER, 90 CM_DREQ_COUNTER, 91 CM_DREP_COUNTER, 92 CM_SIDR_REQ_COUNTER, 93 CM_SIDR_REP_COUNTER, 94 CM_LAP_COUNTER, 95 CM_APR_COUNTER, 96 CM_ATTR_COUNT, 97 CM_ATTR_ID_OFFSET = 0x0010, 98}; 99 100enum { 101 CM_XMIT, 102 CM_XMIT_RETRIES, 103 CM_RECV, 104 CM_RECV_DUPLICATES, 105 CM_COUNTER_GROUPS 106}; 107 108static char const counter_group_names[CM_COUNTER_GROUPS] 109 [sizeof("cm_rx_duplicates")] = { 110 "cm_tx_msgs", "cm_tx_retries", 111 "cm_rx_msgs", "cm_rx_duplicates" 112}; 113 114struct cm_counter_group { 115 struct kobject obj; 116 atomic_long_t counter[CM_ATTR_COUNT]; 117}; 118 119struct cm_counter_attribute { 120 struct attribute attr; 121 int index; 122}; 123 124#define CM_COUNTER_ATTR(_name, _index) \ 125struct cm_counter_attribute cm_##_name##_counter_attr = { \ 126 .attr = { .name = __stringify(_name), .mode = 0444 }, \ 127 .index = _index \ 128} 129 130static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 131static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 132static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 133static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 134static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 135static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 136static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 137static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 138static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 139static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 140static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 141 142static struct attribute *cm_counter_default_attrs[] = { 143 &cm_req_counter_attr.attr, 144 &cm_mra_counter_attr.attr, 145 &cm_rej_counter_attr.attr, 146 &cm_rep_counter_attr.attr, 147 &cm_rtu_counter_attr.attr, 148 &cm_dreq_counter_attr.attr, 149 &cm_drep_counter_attr.attr, 150 &cm_sidr_req_counter_attr.attr, 151 &cm_sidr_rep_counter_attr.attr, 152 &cm_lap_counter_attr.attr, 153 &cm_apr_counter_attr.attr, 154 NULL 155}; 156 157struct cm_port { 158 struct cm_device *cm_dev; 159 struct ib_mad_agent *mad_agent; 160 struct kobject port_obj; 161 u8 port_num; 162 struct cm_counter_group counter_group[CM_COUNTER_GROUPS]; 163}; 164 165struct cm_device { 166 struct list_head list; 167 struct ib_device *ib_device; 168 struct device *device; 169 u8 ack_delay; 170 struct cm_port *port[0]; 171}; 172 173struct cm_av { 174 struct cm_port *port; 175 union ib_gid dgid; 176 struct ib_ah_attr ah_attr; 177 u16 pkey_index; 178 u8 timeout; 179}; 180 181struct cm_work { 182 struct delayed_work work; 183 struct list_head list; 184 struct cm_port *port; 185 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */ 186 __be32 local_id; /* Established / timewait */ 187 __be32 remote_id; 188 struct ib_cm_event cm_event; 189 struct ib_sa_path_rec path[0]; 190}; 191 192struct cm_timewait_info { 193 struct cm_work work; /* Must be first. */ 194 struct list_head list; 195 struct rb_node remote_qp_node; 196 struct rb_node remote_id_node; 197 __be64 remote_ca_guid; 198 __be32 remote_qpn; 199 u8 inserted_remote_qp; 200 u8 inserted_remote_id; 201}; 202 203struct cm_id_private { 204 struct ib_cm_id id; 205 206 struct rb_node service_node; 207 struct rb_node sidr_id_node; 208 spinlock_t lock; /* Do not acquire inside cm.lock */ 209 struct completion comp; 210 atomic_t refcount; 211 212 struct ib_mad_send_buf *msg; 213 struct cm_timewait_info *timewait_info; 214 /* todo: use alternate port on send failure */ 215 struct cm_av av; 216 struct cm_av alt_av; 217 struct ib_cm_compare_data *compare_data; 218 219 void *private_data; 220 __be64 tid; 221 __be32 local_qpn; 222 __be32 remote_qpn; 223 enum ib_qp_type qp_type; 224 __be32 sq_psn; 225 __be32 rq_psn; 226 int timeout_ms; 227 enum ib_mtu path_mtu; 228 __be16 pkey; 229 u8 private_data_len; 230 u8 max_cm_retries; 231 u8 peer_to_peer; 232 u8 responder_resources; 233 u8 initiator_depth; 234 u8 retry_count; 235 u8 rnr_retry_count; 236 u8 service_timeout; 237 u8 target_ack_delay; 238 239 struct list_head work_list; 240 atomic_t work_count; 241}; 242 243static void cm_work_handler(struct work_struct *work); 244 245static inline void cm_deref_id(struct cm_id_private *cm_id_priv) 246{ 247 if (atomic_dec_and_test(&cm_id_priv->refcount)) 248 complete(&cm_id_priv->comp); 249} 250 251static int cm_alloc_msg(struct cm_id_private *cm_id_priv, 252 struct ib_mad_send_buf **msg) 253{ 254 struct ib_mad_agent *mad_agent; 255 struct ib_mad_send_buf *m; 256 struct ib_ah *ah; 257 258 mad_agent = cm_id_priv->av.port->mad_agent; 259 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr); 260 if (IS_ERR(ah)) 261 return PTR_ERR(ah); 262 263 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn, 264 cm_id_priv->av.pkey_index, 265 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 266 GFP_ATOMIC); 267 if (IS_ERR(m)) { 268 ib_destroy_ah(ah); 269 return PTR_ERR(m); 270 } 271 272 /* Timeout set by caller if response is expected. */ 273 m->ah = ah; 274 m->retries = cm_id_priv->max_cm_retries; 275 276 atomic_inc(&cm_id_priv->refcount); 277 m->context[0] = cm_id_priv; 278 *msg = m; 279 return 0; 280} 281 282static int cm_alloc_response_msg(struct cm_port *port, 283 struct ib_mad_recv_wc *mad_recv_wc, 284 struct ib_mad_send_buf **msg) 285{ 286 struct ib_mad_send_buf *m; 287 struct ib_ah *ah; 288 289 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc, 290 mad_recv_wc->recv_buf.grh, port->port_num); 291 if (IS_ERR(ah)) 292 return PTR_ERR(ah); 293 294 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index, 295 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA, 296 GFP_ATOMIC); 297 if (IS_ERR(m)) { 298 ib_destroy_ah(ah); 299 return PTR_ERR(m); 300 } 301 m->ah = ah; 302 *msg = m; 303 return 0; 304} 305 306static void cm_free_msg(struct ib_mad_send_buf *msg) 307{ 308 ib_destroy_ah(msg->ah); 309 if (msg->context[0]) 310 cm_deref_id(msg->context[0]); 311 ib_free_send_mad(msg); 312} 313 314static void * cm_copy_private_data(const void *private_data, 315 u8 private_data_len) 316{ 317 void *data; 318 319 if (!private_data || !private_data_len) 320 return NULL; 321 322 data = kmemdup(private_data, private_data_len, GFP_KERNEL); 323 if (!data) 324 return ERR_PTR(-ENOMEM); 325 326 return data; 327} 328 329static void cm_set_private_data(struct cm_id_private *cm_id_priv, 330 void *private_data, u8 private_data_len) 331{ 332 if (cm_id_priv->private_data && cm_id_priv->private_data_len) 333 kfree(cm_id_priv->private_data); 334 335 cm_id_priv->private_data = private_data; 336 cm_id_priv->private_data_len = private_data_len; 337} 338 339static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc, 340 struct ib_grh *grh, struct cm_av *av) 341{ 342 av->port = port; 343 av->pkey_index = wc->pkey_index; 344 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc, 345 grh, &av->ah_attr); 346} 347 348static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av) 349{ 350 struct cm_device *cm_dev; 351 struct cm_port *port = NULL; 352 unsigned long flags; 353 int ret; 354 u8 p; 355 356 read_lock_irqsave(&cm.device_lock, flags); 357 list_for_each_entry(cm_dev, &cm.device_list, list) { 358 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid, 359 &p, NULL)) { 360 port = cm_dev->port[p-1]; 361 break; 362 } 363 } 364 read_unlock_irqrestore(&cm.device_lock, flags); 365 366 if (!port) 367 return -EINVAL; 368 369 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num, 370 be16_to_cpu(path->pkey), &av->pkey_index); 371 if (ret) 372 return ret; 373 374 av->port = port; 375 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path, 376 &av->ah_attr); 377 av->timeout = path->packet_life_time + 1; 378 return 0; 379} 380 381static int cm_alloc_id(struct cm_id_private *cm_id_priv) 382{ 383 unsigned long flags; 384 int ret, id; 385 static int next_id; 386 387 do { 388 spin_lock_irqsave(&cm.lock, flags); 389 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv, 390 next_id, &id); 391 if (!ret) 392 next_id = ((unsigned) id + 1) & MAX_ID_MASK; 393 spin_unlock_irqrestore(&cm.lock, flags); 394 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) ); 395 396 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand; 397 return ret; 398} 399 400static void cm_free_id(__be32 local_id) 401{ 402 spin_lock_irq(&cm.lock); 403 idr_remove(&cm.local_id_table, 404 (__force int) (local_id ^ cm.random_id_operand)); 405 spin_unlock_irq(&cm.lock); 406} 407 408static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id) 409{ 410 struct cm_id_private *cm_id_priv; 411 412 cm_id_priv = idr_find(&cm.local_id_table, 413 (__force int) (local_id ^ cm.random_id_operand)); 414 if (cm_id_priv) { 415 if (cm_id_priv->id.remote_id == remote_id) 416 atomic_inc(&cm_id_priv->refcount); 417 else 418 cm_id_priv = NULL; 419 } 420 421 return cm_id_priv; 422} 423 424static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id) 425{ 426 struct cm_id_private *cm_id_priv; 427 428 spin_lock_irq(&cm.lock); 429 cm_id_priv = cm_get_id(local_id, remote_id); 430 spin_unlock_irq(&cm.lock); 431 432 return cm_id_priv; 433} 434 435static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask) 436{ 437 int i; 438 439 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++) 440 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] & 441 ((unsigned long *) mask)[i]; 442} 443 444static int cm_compare_data(struct ib_cm_compare_data *src_data, 445 struct ib_cm_compare_data *dst_data) 446{ 447 u8 src[IB_CM_COMPARE_SIZE]; 448 u8 dst[IB_CM_COMPARE_SIZE]; 449 450 if (!src_data || !dst_data) 451 return 0; 452 453 cm_mask_copy(src, src_data->data, dst_data->mask); 454 cm_mask_copy(dst, dst_data->data, src_data->mask); 455 return memcmp(src, dst, IB_CM_COMPARE_SIZE); 456} 457 458static int cm_compare_private_data(u8 *private_data, 459 struct ib_cm_compare_data *dst_data) 460{ 461 u8 src[IB_CM_COMPARE_SIZE]; 462 463 if (!dst_data) 464 return 0; 465 466 cm_mask_copy(src, private_data, dst_data->mask); 467 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE); 468} 469 470/* 471 * Trivial helpers to strip endian annotation and compare; the 472 * endianness doesn't actually matter since we just need a stable 473 * order for the RB tree. 474 */ 475static int be32_lt(__be32 a, __be32 b) 476{ 477 return (__force u32) a < (__force u32) b; 478} 479 480static int be32_gt(__be32 a, __be32 b) 481{ 482 return (__force u32) a > (__force u32) b; 483} 484 485static int be64_lt(__be64 a, __be64 b) 486{ 487 return (__force u64) a < (__force u64) b; 488} 489 490static int be64_gt(__be64 a, __be64 b) 491{ 492 return (__force u64) a > (__force u64) b; 493} 494 495static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 496{ 497 struct rb_node **link = &cm.listen_service_table.rb_node; 498 struct rb_node *parent = NULL; 499 struct cm_id_private *cur_cm_id_priv; 500 __be64 service_id = cm_id_priv->id.service_id; 501 __be64 service_mask = cm_id_priv->id.service_mask; 502 int data_cmp; 503 504 while (*link) { 505 parent = *link; 506 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 507 service_node); 508 data_cmp = cm_compare_data(cm_id_priv->compare_data, 509 cur_cm_id_priv->compare_data); 510 if ((cur_cm_id_priv->id.service_mask & service_id) == 511 (service_mask & cur_cm_id_priv->id.service_id) && 512 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 513 !data_cmp) 514 return cur_cm_id_priv; 515 516 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 517 link = &(*link)->rb_left; 518 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 519 link = &(*link)->rb_right; 520 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id)) 521 link = &(*link)->rb_left; 522 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id)) 523 link = &(*link)->rb_right; 524 else if (data_cmp < 0) 525 link = &(*link)->rb_left; 526 else 527 link = &(*link)->rb_right; 528 } 529 rb_link_node(&cm_id_priv->service_node, parent, link); 530 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 531 return NULL; 532} 533 534static struct cm_id_private * cm_find_listen(struct ib_device *device, 535 __be64 service_id, 536 u8 *private_data) 537{ 538 struct rb_node *node = cm.listen_service_table.rb_node; 539 struct cm_id_private *cm_id_priv; 540 int data_cmp; 541 542 while (node) { 543 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 544 data_cmp = cm_compare_private_data(private_data, 545 cm_id_priv->compare_data); 546 if ((cm_id_priv->id.service_mask & service_id) == 547 cm_id_priv->id.service_id && 548 (cm_id_priv->id.device == device) && !data_cmp) 549 return cm_id_priv; 550 551 if (device < cm_id_priv->id.device) 552 node = node->rb_left; 553 else if (device > cm_id_priv->id.device) 554 node = node->rb_right; 555 else if (be64_lt(service_id, cm_id_priv->id.service_id)) 556 node = node->rb_left; 557 else if (be64_gt(service_id, cm_id_priv->id.service_id)) 558 node = node->rb_right; 559 else if (data_cmp < 0) 560 node = node->rb_left; 561 else 562 node = node->rb_right; 563 } 564 return NULL; 565} 566 567static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 568 *timewait_info) 569{ 570 struct rb_node **link = &cm.remote_id_table.rb_node; 571 struct rb_node *parent = NULL; 572 struct cm_timewait_info *cur_timewait_info; 573 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 574 __be32 remote_id = timewait_info->work.remote_id; 575 576 while (*link) { 577 parent = *link; 578 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 579 remote_id_node); 580 if (be32_lt(remote_id, cur_timewait_info->work.remote_id)) 581 link = &(*link)->rb_left; 582 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id)) 583 link = &(*link)->rb_right; 584 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 585 link = &(*link)->rb_left; 586 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 587 link = &(*link)->rb_right; 588 else 589 return cur_timewait_info; 590 } 591 timewait_info->inserted_remote_id = 1; 592 rb_link_node(&timewait_info->remote_id_node, parent, link); 593 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 594 return NULL; 595} 596 597static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 598 __be32 remote_id) 599{ 600 struct rb_node *node = cm.remote_id_table.rb_node; 601 struct cm_timewait_info *timewait_info; 602 603 while (node) { 604 timewait_info = rb_entry(node, struct cm_timewait_info, 605 remote_id_node); 606 if (be32_lt(remote_id, timewait_info->work.remote_id)) 607 node = node->rb_left; 608 else if (be32_gt(remote_id, timewait_info->work.remote_id)) 609 node = node->rb_right; 610 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid)) 611 node = node->rb_left; 612 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid)) 613 node = node->rb_right; 614 else 615 return timewait_info; 616 } 617 return NULL; 618} 619 620static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 621 *timewait_info) 622{ 623 struct rb_node **link = &cm.remote_qp_table.rb_node; 624 struct rb_node *parent = NULL; 625 struct cm_timewait_info *cur_timewait_info; 626 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 627 __be32 remote_qpn = timewait_info->remote_qpn; 628 629 while (*link) { 630 parent = *link; 631 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 632 remote_qp_node); 633 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn)) 634 link = &(*link)->rb_left; 635 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn)) 636 link = &(*link)->rb_right; 637 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 638 link = &(*link)->rb_left; 639 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid)) 640 link = &(*link)->rb_right; 641 else 642 return cur_timewait_info; 643 } 644 timewait_info->inserted_remote_qp = 1; 645 rb_link_node(&timewait_info->remote_qp_node, parent, link); 646 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 647 return NULL; 648} 649 650static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 651 *cm_id_priv) 652{ 653 struct rb_node **link = &cm.remote_sidr_table.rb_node; 654 struct rb_node *parent = NULL; 655 struct cm_id_private *cur_cm_id_priv; 656 union ib_gid *port_gid = &cm_id_priv->av.dgid; 657 __be32 remote_id = cm_id_priv->id.remote_id; 658 659 while (*link) { 660 parent = *link; 661 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 662 sidr_id_node); 663 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id)) 664 link = &(*link)->rb_left; 665 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id)) 666 link = &(*link)->rb_right; 667 else { 668 int cmp; 669 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 670 sizeof *port_gid); 671 if (cmp < 0) 672 link = &(*link)->rb_left; 673 else if (cmp > 0) 674 link = &(*link)->rb_right; 675 else 676 return cur_cm_id_priv; 677 } 678 } 679 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 680 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 681 return NULL; 682} 683 684static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 685 enum ib_cm_sidr_status status) 686{ 687 struct ib_cm_sidr_rep_param param; 688 689 memset(¶m, 0, sizeof param); 690 param.status = status; 691 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 692} 693 694struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 695 ib_cm_handler cm_handler, 696 void *context) 697{ 698 struct cm_id_private *cm_id_priv; 699 int ret; 700 701 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 702 if (!cm_id_priv) 703 return ERR_PTR(-ENOMEM); 704 705 cm_id_priv->id.state = IB_CM_IDLE; 706 cm_id_priv->id.device = device; 707 cm_id_priv->id.cm_handler = cm_handler; 708 cm_id_priv->id.context = context; 709 cm_id_priv->id.remote_cm_qpn = 1; 710 ret = cm_alloc_id(cm_id_priv); 711 if (ret) 712 goto error; 713 714 spin_lock_init(&cm_id_priv->lock); 715 init_completion(&cm_id_priv->comp); 716 INIT_LIST_HEAD(&cm_id_priv->work_list); 717 atomic_set(&cm_id_priv->work_count, -1); 718 atomic_set(&cm_id_priv->refcount, 1); 719 return &cm_id_priv->id; 720 721error: 722 kfree(cm_id_priv); 723 return ERR_PTR(-ENOMEM); 724} 725EXPORT_SYMBOL(ib_create_cm_id); 726 727static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 728{ 729 struct cm_work *work; 730 731 if (list_empty(&cm_id_priv->work_list)) 732 return NULL; 733 734 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 735 list_del(&work->list); 736 return work; 737} 738 739static void cm_free_work(struct cm_work *work) 740{ 741 if (work->mad_recv_wc) 742 ib_free_recv_mad(work->mad_recv_wc); 743 kfree(work); 744} 745 746static inline int cm_convert_to_ms(int iba_time) 747{ 748 /* approximate conversion to ms from 4.096us x 2^iba_time */ 749 return 1 << max(iba_time - 8, 0); 750} 751 752/* 753 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 754 * Because of how ack_timeout is stored, adding one doubles the timeout. 755 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 756 * increment it (round up) only if the other is within 50%. 757 */ 758static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 759{ 760 int ack_timeout = packet_life_time + 1; 761 762 if (ack_timeout >= ca_ack_delay) 763 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 764 else 765 ack_timeout = ca_ack_delay + 766 (ack_timeout >= (ca_ack_delay - 1)); 767 768 return min(31, ack_timeout); 769} 770 771static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 772{ 773 if (timewait_info->inserted_remote_id) { 774 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 775 timewait_info->inserted_remote_id = 0; 776 } 777 778 if (timewait_info->inserted_remote_qp) { 779 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 780 timewait_info->inserted_remote_qp = 0; 781 } 782} 783 784static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 785{ 786 struct cm_timewait_info *timewait_info; 787 788 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 789 if (!timewait_info) 790 return ERR_PTR(-ENOMEM); 791 792 timewait_info->work.local_id = local_id; 793 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 794 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 795 return timewait_info; 796} 797 798static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 799{ 800 int wait_time; 801 unsigned long flags; 802 803 spin_lock_irqsave(&cm.lock, flags); 804 cm_cleanup_timewait(cm_id_priv->timewait_info); 805 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 806 spin_unlock_irqrestore(&cm.lock, flags); 807 808 /* 809 * The cm_id could be destroyed by the user before we exit timewait. 810 * To protect against this, we search for the cm_id after exiting 811 * timewait before notifying the user that we've exited timewait. 812 */ 813 cm_id_priv->id.state = IB_CM_TIMEWAIT; 814 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 815 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 816 msecs_to_jiffies(wait_time)); 817 cm_id_priv->timewait_info = NULL; 818} 819 820static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 821{ 822 unsigned long flags; 823 824 cm_id_priv->id.state = IB_CM_IDLE; 825 if (cm_id_priv->timewait_info) { 826 spin_lock_irqsave(&cm.lock, flags); 827 cm_cleanup_timewait(cm_id_priv->timewait_info); 828 spin_unlock_irqrestore(&cm.lock, flags); 829 kfree(cm_id_priv->timewait_info); 830 cm_id_priv->timewait_info = NULL; 831 } 832} 833 834static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 835{ 836 struct cm_id_private *cm_id_priv; 837 struct cm_work *work; 838 839 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 840retest: 841 spin_lock_irq(&cm_id_priv->lock); 842 switch (cm_id->state) { 843 case IB_CM_LISTEN: 844 cm_id->state = IB_CM_IDLE; 845 spin_unlock_irq(&cm_id_priv->lock); 846 spin_lock_irq(&cm.lock); 847 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 848 spin_unlock_irq(&cm.lock); 849 break; 850 case IB_CM_SIDR_REQ_SENT: 851 cm_id->state = IB_CM_IDLE; 852 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 853 spin_unlock_irq(&cm_id_priv->lock); 854 break; 855 case IB_CM_SIDR_REQ_RCVD: 856 spin_unlock_irq(&cm_id_priv->lock); 857 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 858 break; 859 case IB_CM_REQ_SENT: 860 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 861 spin_unlock_irq(&cm_id_priv->lock); 862 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 863 &cm_id_priv->id.device->node_guid, 864 sizeof cm_id_priv->id.device->node_guid, 865 NULL, 0); 866 break; 867 case IB_CM_REQ_RCVD: 868 if (err == -ENOMEM) { 869 /* Do not reject to allow future retries. */ 870 cm_reset_to_idle(cm_id_priv); 871 spin_unlock_irq(&cm_id_priv->lock); 872 } else { 873 spin_unlock_irq(&cm_id_priv->lock); 874 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 875 NULL, 0, NULL, 0); 876 } 877 break; 878 case IB_CM_MRA_REQ_RCVD: 879 case IB_CM_REP_SENT: 880 case IB_CM_MRA_REP_RCVD: 881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 882 /* Fall through */ 883 case IB_CM_MRA_REQ_SENT: 884 case IB_CM_REP_RCVD: 885 case IB_CM_MRA_REP_SENT: 886 spin_unlock_irq(&cm_id_priv->lock); 887 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 888 NULL, 0, NULL, 0); 889 break; 890 case IB_CM_ESTABLISHED: 891 spin_unlock_irq(&cm_id_priv->lock); 892 ib_send_cm_dreq(cm_id, NULL, 0); 893 goto retest; 894 case IB_CM_DREQ_SENT: 895 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 896 cm_enter_timewait(cm_id_priv); 897 spin_unlock_irq(&cm_id_priv->lock); 898 break; 899 case IB_CM_DREQ_RCVD: 900 spin_unlock_irq(&cm_id_priv->lock); 901 ib_send_cm_drep(cm_id, NULL, 0); 902 break; 903 default: 904 spin_unlock_irq(&cm_id_priv->lock); 905 break; 906 } 907 908 cm_free_id(cm_id->local_id); 909 cm_deref_id(cm_id_priv); 910 wait_for_completion(&cm_id_priv->comp); 911 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 912 cm_free_work(work); 913 kfree(cm_id_priv->compare_data); 914 kfree(cm_id_priv->private_data); 915 kfree(cm_id_priv); 916} 917 918void ib_destroy_cm_id(struct ib_cm_id *cm_id) 919{ 920 cm_destroy_id(cm_id, 0); 921} 922EXPORT_SYMBOL(ib_destroy_cm_id); 923 924int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 925 struct ib_cm_compare_data *compare_data) 926{ 927 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 928 unsigned long flags; 929 int ret = 0; 930 931 service_mask = service_mask ? service_mask : ~cpu_to_be64(0); 932 service_id &= service_mask; 933 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 934 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 935 return -EINVAL; 936 937 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 938 if (cm_id->state != IB_CM_IDLE) 939 return -EINVAL; 940 941 if (compare_data) { 942 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 943 GFP_KERNEL); 944 if (!cm_id_priv->compare_data) 945 return -ENOMEM; 946 cm_mask_copy(cm_id_priv->compare_data->data, 947 compare_data->data, compare_data->mask); 948 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 949 IB_CM_COMPARE_SIZE); 950 } 951 952 cm_id->state = IB_CM_LISTEN; 953 954 spin_lock_irqsave(&cm.lock, flags); 955 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 956 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 957 cm_id->service_mask = ~cpu_to_be64(0); 958 } else { 959 cm_id->service_id = service_id; 960 cm_id->service_mask = service_mask; 961 } 962 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 963 spin_unlock_irqrestore(&cm.lock, flags); 964 965 if (cur_cm_id_priv) { 966 cm_id->state = IB_CM_IDLE; 967 kfree(cm_id_priv->compare_data); 968 cm_id_priv->compare_data = NULL; 969 ret = -EBUSY; 970 } 971 return ret; 972} 973EXPORT_SYMBOL(ib_cm_listen); 974 975static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 976 enum cm_msg_sequence msg_seq) 977{ 978 u64 hi_tid, low_tid; 979 980 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 981 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 982 (msg_seq << 30)); 983 return cpu_to_be64(hi_tid | low_tid); 984} 985 986static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 987 __be16 attr_id, __be64 tid) 988{ 989 hdr->base_version = IB_MGMT_BASE_VERSION; 990 hdr->mgmt_class = IB_MGMT_CLASS_CM; 991 hdr->class_version = IB_CM_CLASS_VERSION; 992 hdr->method = IB_MGMT_METHOD_SEND; 993 hdr->attr_id = attr_id; 994 hdr->tid = tid; 995} 996 997static void cm_format_req(struct cm_req_msg *req_msg, 998 struct cm_id_private *cm_id_priv, 999 struct ib_cm_req_param *param) 1000{ 1001 struct ib_sa_path_rec *pri_path = param->primary_path; 1002 struct ib_sa_path_rec *alt_path = param->alternate_path; 1003 1004 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 1005 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 1006 1007 req_msg->local_comm_id = cm_id_priv->id.local_id; 1008 req_msg->service_id = param->service_id; 1009 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1010 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 1011 cm_req_set_resp_res(req_msg, param->responder_resources); 1012 cm_req_set_init_depth(req_msg, param->initiator_depth); 1013 cm_req_set_remote_resp_timeout(req_msg, 1014 param->remote_cm_response_timeout); 1015 cm_req_set_qp_type(req_msg, param->qp_type); 1016 cm_req_set_flow_ctrl(req_msg, param->flow_control); 1017 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 1018 cm_req_set_local_resp_timeout(req_msg, 1019 param->local_cm_response_timeout); 1020 cm_req_set_retry_count(req_msg, param->retry_count); 1021 req_msg->pkey = param->primary_path->pkey; 1022 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 1023 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 1024 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 1025 cm_req_set_srq(req_msg, param->srq); 1026 1027 if (pri_path->hop_limit <= 1) { 1028 req_msg->primary_local_lid = pri_path->slid; 1029 req_msg->primary_remote_lid = pri_path->dlid; 1030 } else { 1031 /* Work-around until there's a way to obtain remote LID info */ 1032 req_msg->primary_local_lid = IB_LID_PERMISSIVE; 1033 req_msg->primary_remote_lid = IB_LID_PERMISSIVE; 1034 } 1035 req_msg->primary_local_gid = pri_path->sgid; 1036 req_msg->primary_remote_gid = pri_path->dgid; 1037 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label); 1038 cm_req_set_primary_packet_rate(req_msg, pri_path->rate); 1039 req_msg->primary_traffic_class = pri_path->traffic_class; 1040 req_msg->primary_hop_limit = pri_path->hop_limit; 1041 cm_req_set_primary_sl(req_msg, pri_path->sl); 1042 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1)); 1043 cm_req_set_primary_local_ack_timeout(req_msg, 1044 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1045 pri_path->packet_life_time)); 1046 1047 if (alt_path) { 1048 if (alt_path->hop_limit <= 1) { 1049 req_msg->alt_local_lid = alt_path->slid; 1050 req_msg->alt_remote_lid = alt_path->dlid; 1051 } else { 1052 req_msg->alt_local_lid = IB_LID_PERMISSIVE; 1053 req_msg->alt_remote_lid = IB_LID_PERMISSIVE; 1054 } 1055 req_msg->alt_local_gid = alt_path->sgid; 1056 req_msg->alt_remote_gid = alt_path->dgid; 1057 cm_req_set_alt_flow_label(req_msg, 1058 alt_path->flow_label); 1059 cm_req_set_alt_packet_rate(req_msg, alt_path->rate); 1060 req_msg->alt_traffic_class = alt_path->traffic_class; 1061 req_msg->alt_hop_limit = alt_path->hop_limit; 1062 cm_req_set_alt_sl(req_msg, alt_path->sl); 1063 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1)); 1064 cm_req_set_alt_local_ack_timeout(req_msg, 1065 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1066 alt_path->packet_life_time)); 1067 } 1068 1069 if (param->private_data && param->private_data_len) 1070 memcpy(req_msg->private_data, param->private_data, 1071 param->private_data_len); 1072} 1073 1074static int cm_validate_req_param(struct ib_cm_req_param *param) 1075{ 1076 /* peer-to-peer not supported */ 1077 if (param->peer_to_peer) 1078 return -EINVAL; 1079 1080 if (!param->primary_path) 1081 return -EINVAL; 1082 1083 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 1084 return -EINVAL; 1085 1086 if (param->private_data && 1087 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1088 return -EINVAL; 1089 1090 if (param->alternate_path && 1091 (param->alternate_path->pkey != param->primary_path->pkey || 1092 param->alternate_path->mtu != param->primary_path->mtu)) 1093 return -EINVAL; 1094 1095 return 0; 1096} 1097 1098int ib_send_cm_req(struct ib_cm_id *cm_id, 1099 struct ib_cm_req_param *param) 1100{ 1101 struct cm_id_private *cm_id_priv; 1102 struct cm_req_msg *req_msg; 1103 unsigned long flags; 1104 int ret; 1105 1106 ret = cm_validate_req_param(param); 1107 if (ret) 1108 return ret; 1109 1110 /* Verify that we're not in timewait. */ 1111 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1112 spin_lock_irqsave(&cm_id_priv->lock, flags); 1113 if (cm_id->state != IB_CM_IDLE) { 1114 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1115 ret = -EINVAL; 1116 goto out; 1117 } 1118 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1119 1120 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1121 id.local_id); 1122 if (IS_ERR(cm_id_priv->timewait_info)) { 1123 ret = PTR_ERR(cm_id_priv->timewait_info); 1124 goto out; 1125 } 1126 1127 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1128 if (ret) 1129 goto error1; 1130 if (param->alternate_path) { 1131 ret = cm_init_av_by_path(param->alternate_path, 1132 &cm_id_priv->alt_av); 1133 if (ret) 1134 goto error1; 1135 } 1136 cm_id->service_id = param->service_id; 1137 cm_id->service_mask = ~cpu_to_be64(0); 1138 cm_id_priv->timeout_ms = cm_convert_to_ms( 1139 param->primary_path->packet_life_time) * 2 + 1140 cm_convert_to_ms( 1141 param->remote_cm_response_timeout); 1142 cm_id_priv->max_cm_retries = param->max_cm_retries; 1143 cm_id_priv->initiator_depth = param->initiator_depth; 1144 cm_id_priv->responder_resources = param->responder_resources; 1145 cm_id_priv->retry_count = param->retry_count; 1146 cm_id_priv->path_mtu = param->primary_path->mtu; 1147 cm_id_priv->pkey = param->primary_path->pkey; 1148 cm_id_priv->qp_type = param->qp_type; 1149 1150 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1151 if (ret) 1152 goto error1; 1153 1154 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1155 cm_format_req(req_msg, cm_id_priv, param); 1156 cm_id_priv->tid = req_msg->hdr.tid; 1157 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1158 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1159 1160 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1161 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1162 1163 spin_lock_irqsave(&cm_id_priv->lock, flags); 1164 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1165 if (ret) { 1166 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1167 goto error2; 1168 } 1169 BUG_ON(cm_id->state != IB_CM_IDLE); 1170 cm_id->state = IB_CM_REQ_SENT; 1171 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1172 return 0; 1173 1174error2: cm_free_msg(cm_id_priv->msg); 1175error1: kfree(cm_id_priv->timewait_info); 1176out: return ret; 1177} 1178EXPORT_SYMBOL(ib_send_cm_req); 1179 1180static int cm_issue_rej(struct cm_port *port, 1181 struct ib_mad_recv_wc *mad_recv_wc, 1182 enum ib_cm_rej_reason reason, 1183 enum cm_msg_response msg_rejected, 1184 void *ari, u8 ari_length) 1185{ 1186 struct ib_mad_send_buf *msg = NULL; 1187 struct cm_rej_msg *rej_msg, *rcv_msg; 1188 int ret; 1189 1190 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1191 if (ret) 1192 return ret; 1193 1194 /* We just need common CM header information. Cast to any message. */ 1195 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1196 rej_msg = (struct cm_rej_msg *) msg->mad; 1197 1198 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1199 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1200 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1201 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1202 rej_msg->reason = cpu_to_be16(reason); 1203 1204 if (ari && ari_length) { 1205 cm_rej_set_reject_info_len(rej_msg, ari_length); 1206 memcpy(rej_msg->ari, ari, ari_length); 1207 } 1208 1209 ret = ib_post_send_mad(msg, NULL); 1210 if (ret) 1211 cm_free_msg(msg); 1212 1213 return ret; 1214} 1215 1216static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1217 __be32 local_qpn, __be32 remote_qpn) 1218{ 1219 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1220 ((local_ca_guid == remote_ca_guid) && 1221 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1222} 1223 1224static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1225 struct ib_sa_path_rec *primary_path, 1226 struct ib_sa_path_rec *alt_path) 1227{ 1228 memset(primary_path, 0, sizeof *primary_path); 1229 primary_path->dgid = req_msg->primary_local_gid; 1230 primary_path->sgid = req_msg->primary_remote_gid; 1231 primary_path->dlid = req_msg->primary_local_lid; 1232 primary_path->slid = req_msg->primary_remote_lid; 1233 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1234 primary_path->hop_limit = req_msg->primary_hop_limit; 1235 primary_path->traffic_class = req_msg->primary_traffic_class; 1236 primary_path->reversible = 1; 1237 primary_path->pkey = req_msg->pkey; 1238 primary_path->sl = cm_req_get_primary_sl(req_msg); 1239 primary_path->mtu_selector = IB_SA_EQ; 1240 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1241 primary_path->rate_selector = IB_SA_EQ; 1242 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1243 primary_path->packet_life_time_selector = IB_SA_EQ; 1244 primary_path->packet_life_time = 1245 cm_req_get_primary_local_ack_timeout(req_msg); 1246 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1247 1248 if (req_msg->alt_local_lid) { 1249 memset(alt_path, 0, sizeof *alt_path); 1250 alt_path->dgid = req_msg->alt_local_gid; 1251 alt_path->sgid = req_msg->alt_remote_gid; 1252 alt_path->dlid = req_msg->alt_local_lid; 1253 alt_path->slid = req_msg->alt_remote_lid; 1254 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1255 alt_path->hop_limit = req_msg->alt_hop_limit; 1256 alt_path->traffic_class = req_msg->alt_traffic_class; 1257 alt_path->reversible = 1; 1258 alt_path->pkey = req_msg->pkey; 1259 alt_path->sl = cm_req_get_alt_sl(req_msg); 1260 alt_path->mtu_selector = IB_SA_EQ; 1261 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1262 alt_path->rate_selector = IB_SA_EQ; 1263 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1264 alt_path->packet_life_time_selector = IB_SA_EQ; 1265 alt_path->packet_life_time = 1266 cm_req_get_alt_local_ack_timeout(req_msg); 1267 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1268 } 1269} 1270 1271static void cm_format_req_event(struct cm_work *work, 1272 struct cm_id_private *cm_id_priv, 1273 struct ib_cm_id *listen_id) 1274{ 1275 struct cm_req_msg *req_msg; 1276 struct ib_cm_req_event_param *param; 1277 1278 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1279 param = &work->cm_event.param.req_rcvd; 1280 param->listen_id = listen_id; 1281 param->port = cm_id_priv->av.port->port_num; 1282 param->primary_path = &work->path[0]; 1283 if (req_msg->alt_local_lid) 1284 param->alternate_path = &work->path[1]; 1285 else 1286 param->alternate_path = NULL; 1287 param->remote_ca_guid = req_msg->local_ca_guid; 1288 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1289 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1290 param->qp_type = cm_req_get_qp_type(req_msg); 1291 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1292 param->responder_resources = cm_req_get_init_depth(req_msg); 1293 param->initiator_depth = cm_req_get_resp_res(req_msg); 1294 param->local_cm_response_timeout = 1295 cm_req_get_remote_resp_timeout(req_msg); 1296 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1297 param->remote_cm_response_timeout = 1298 cm_req_get_local_resp_timeout(req_msg); 1299 param->retry_count = cm_req_get_retry_count(req_msg); 1300 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1301 param->srq = cm_req_get_srq(req_msg); 1302 work->cm_event.private_data = &req_msg->private_data; 1303} 1304 1305static void cm_process_work(struct cm_id_private *cm_id_priv, 1306 struct cm_work *work) 1307{ 1308 int ret; 1309 1310 /* We will typically only have the current event to report. */ 1311 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1312 cm_free_work(work); 1313 1314 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1315 spin_lock_irq(&cm_id_priv->lock); 1316 work = cm_dequeue_work(cm_id_priv); 1317 spin_unlock_irq(&cm_id_priv->lock); 1318 BUG_ON(!work); 1319 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1320 &work->cm_event); 1321 cm_free_work(work); 1322 } 1323 cm_deref_id(cm_id_priv); 1324 if (ret) 1325 cm_destroy_id(&cm_id_priv->id, ret); 1326} 1327 1328static void cm_format_mra(struct cm_mra_msg *mra_msg, 1329 struct cm_id_private *cm_id_priv, 1330 enum cm_msg_response msg_mraed, u8 service_timeout, 1331 const void *private_data, u8 private_data_len) 1332{ 1333 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1334 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1335 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1336 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1337 cm_mra_set_service_timeout(mra_msg, service_timeout); 1338 1339 if (private_data && private_data_len) 1340 memcpy(mra_msg->private_data, private_data, private_data_len); 1341} 1342 1343static void cm_format_rej(struct cm_rej_msg *rej_msg, 1344 struct cm_id_private *cm_id_priv, 1345 enum ib_cm_rej_reason reason, 1346 void *ari, 1347 u8 ari_length, 1348 const void *private_data, 1349 u8 private_data_len) 1350{ 1351 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1352 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1353 1354 switch(cm_id_priv->id.state) { 1355 case IB_CM_REQ_RCVD: 1356 rej_msg->local_comm_id = 0; 1357 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1358 break; 1359 case IB_CM_MRA_REQ_SENT: 1360 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1361 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1362 break; 1363 case IB_CM_REP_RCVD: 1364 case IB_CM_MRA_REP_SENT: 1365 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1366 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1367 break; 1368 default: 1369 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1370 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1371 break; 1372 } 1373 1374 rej_msg->reason = cpu_to_be16(reason); 1375 if (ari && ari_length) { 1376 cm_rej_set_reject_info_len(rej_msg, ari_length); 1377 memcpy(rej_msg->ari, ari, ari_length); 1378 } 1379 1380 if (private_data && private_data_len) 1381 memcpy(rej_msg->private_data, private_data, private_data_len); 1382} 1383 1384static void cm_dup_req_handler(struct cm_work *work, 1385 struct cm_id_private *cm_id_priv) 1386{ 1387 struct ib_mad_send_buf *msg = NULL; 1388 int ret; 1389 1390 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1391 counter[CM_REQ_COUNTER]); 1392 1393 /* Quick state check to discard duplicate REQs. */ 1394 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1395 return; 1396 1397 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1398 if (ret) 1399 return; 1400 1401 spin_lock_irq(&cm_id_priv->lock); 1402 switch (cm_id_priv->id.state) { 1403 case IB_CM_MRA_REQ_SENT: 1404 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1405 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1406 cm_id_priv->private_data, 1407 cm_id_priv->private_data_len); 1408 break; 1409 case IB_CM_TIMEWAIT: 1410 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1411 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1412 break; 1413 default: 1414 goto unlock; 1415 } 1416 spin_unlock_irq(&cm_id_priv->lock); 1417 1418 ret = ib_post_send_mad(msg, NULL); 1419 if (ret) 1420 goto free; 1421 return; 1422 1423unlock: spin_unlock_irq(&cm_id_priv->lock); 1424free: cm_free_msg(msg); 1425} 1426 1427static struct cm_id_private * cm_match_req(struct cm_work *work, 1428 struct cm_id_private *cm_id_priv) 1429{ 1430 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1431 struct cm_timewait_info *timewait_info; 1432 struct cm_req_msg *req_msg; 1433 1434 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1435 1436 /* Check for possible duplicate REQ. */ 1437 spin_lock_irq(&cm.lock); 1438 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1439 if (timewait_info) { 1440 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1441 timewait_info->work.remote_id); 1442 spin_unlock_irq(&cm.lock); 1443 if (cur_cm_id_priv) { 1444 cm_dup_req_handler(work, cur_cm_id_priv); 1445 cm_deref_id(cur_cm_id_priv); 1446 } 1447 return NULL; 1448 } 1449 1450 /* Check for stale connections. */ 1451 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1452 if (timewait_info) { 1453 cm_cleanup_timewait(cm_id_priv->timewait_info); 1454 spin_unlock_irq(&cm.lock); 1455 cm_issue_rej(work->port, work->mad_recv_wc, 1456 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1457 NULL, 0); 1458 return NULL; 1459 } 1460 1461 /* Find matching listen request. */ 1462 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1463 req_msg->service_id, 1464 req_msg->private_data); 1465 if (!listen_cm_id_priv) { 1466 cm_cleanup_timewait(cm_id_priv->timewait_info); 1467 spin_unlock_irq(&cm.lock); 1468 cm_issue_rej(work->port, work->mad_recv_wc, 1469 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1470 NULL, 0); 1471 goto out; 1472 } 1473 atomic_inc(&listen_cm_id_priv->refcount); 1474 atomic_inc(&cm_id_priv->refcount); 1475 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1476 atomic_inc(&cm_id_priv->work_count); 1477 spin_unlock_irq(&cm.lock); 1478out: 1479 return listen_cm_id_priv; 1480} 1481 1482/* 1483 * Work-around for inter-subnet connections. If the LIDs are permissive, 1484 * we need to override the LID/SL data in the REQ with the LID information 1485 * in the work completion. 1486 */ 1487static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc) 1488{ 1489 if (!cm_req_get_primary_subnet_local(req_msg)) { 1490 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) { 1491 req_msg->primary_local_lid = cpu_to_be16(wc->slid); 1492 cm_req_set_primary_sl(req_msg, wc->sl); 1493 } 1494 1495 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE) 1496 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1497 } 1498 1499 if (!cm_req_get_alt_subnet_local(req_msg)) { 1500 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) { 1501 req_msg->alt_local_lid = cpu_to_be16(wc->slid); 1502 cm_req_set_alt_sl(req_msg, wc->sl); 1503 } 1504 1505 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE) 1506 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits); 1507 } 1508} 1509 1510static int cm_req_handler(struct cm_work *work) 1511{ 1512 struct ib_cm_id *cm_id; 1513 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1514 struct cm_req_msg *req_msg; 1515 int ret; 1516 1517 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1518 1519 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL); 1520 if (IS_ERR(cm_id)) 1521 return PTR_ERR(cm_id); 1522 1523 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1524 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1525 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1526 work->mad_recv_wc->recv_buf.grh, 1527 &cm_id_priv->av); 1528 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1529 id.local_id); 1530 if (IS_ERR(cm_id_priv->timewait_info)) { 1531 ret = PTR_ERR(cm_id_priv->timewait_info); 1532 goto destroy; 1533 } 1534 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1535 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1536 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1537 1538 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1539 if (!listen_cm_id_priv) { 1540 ret = -EINVAL; 1541 kfree(cm_id_priv->timewait_info); 1542 goto destroy; 1543 } 1544 1545 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1546 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1547 cm_id_priv->id.service_id = req_msg->service_id; 1548 cm_id_priv->id.service_mask = ~cpu_to_be64(0); 1549 1550 cm_process_routed_req(req_msg, work->mad_recv_wc->wc); 1551 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1552 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1553 if (ret) { 1554 ib_get_cached_gid(work->port->cm_dev->ib_device, 1555 work->port->port_num, 0, &work->path[0].sgid); 1556 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1557 &work->path[0].sgid, sizeof work->path[0].sgid, 1558 NULL, 0); 1559 goto rejected; 1560 } 1561 if (req_msg->alt_local_lid) { 1562 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1563 if (ret) { 1564 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1565 &work->path[0].sgid, 1566 sizeof work->path[0].sgid, NULL, 0); 1567 goto rejected; 1568 } 1569 } 1570 cm_id_priv->tid = req_msg->hdr.tid; 1571 cm_id_priv->timeout_ms = cm_convert_to_ms( 1572 cm_req_get_local_resp_timeout(req_msg)); 1573 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1574 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1575 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1576 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1577 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1578 cm_id_priv->pkey = req_msg->pkey; 1579 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1580 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1581 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1582 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1583 1584 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1585 cm_process_work(cm_id_priv, work); 1586 cm_deref_id(listen_cm_id_priv); 1587 return 0; 1588 1589rejected: 1590 atomic_dec(&cm_id_priv->refcount); 1591 cm_deref_id(listen_cm_id_priv); 1592destroy: 1593 ib_destroy_cm_id(cm_id); 1594 return ret; 1595} 1596 1597static void cm_format_rep(struct cm_rep_msg *rep_msg, 1598 struct cm_id_private *cm_id_priv, 1599 struct ib_cm_rep_param *param) 1600{ 1601 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1602 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1603 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1604 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1605 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1606 rep_msg->resp_resources = param->responder_resources; 1607 rep_msg->initiator_depth = param->initiator_depth; 1608 cm_rep_set_target_ack_delay(rep_msg, 1609 cm_id_priv->av.port->cm_dev->ack_delay); 1610 cm_rep_set_failover(rep_msg, param->failover_accepted); 1611 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1612 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1613 cm_rep_set_srq(rep_msg, param->srq); 1614 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1615 1616 if (param->private_data && param->private_data_len) 1617 memcpy(rep_msg->private_data, param->private_data, 1618 param->private_data_len); 1619} 1620 1621int ib_send_cm_rep(struct ib_cm_id *cm_id, 1622 struct ib_cm_rep_param *param) 1623{ 1624 struct cm_id_private *cm_id_priv; 1625 struct ib_mad_send_buf *msg; 1626 struct cm_rep_msg *rep_msg; 1627 unsigned long flags; 1628 int ret; 1629 1630 if (param->private_data && 1631 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1632 return -EINVAL; 1633 1634 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1635 spin_lock_irqsave(&cm_id_priv->lock, flags); 1636 if (cm_id->state != IB_CM_REQ_RCVD && 1637 cm_id->state != IB_CM_MRA_REQ_SENT) { 1638 ret = -EINVAL; 1639 goto out; 1640 } 1641 1642 ret = cm_alloc_msg(cm_id_priv, &msg); 1643 if (ret) 1644 goto out; 1645 1646 rep_msg = (struct cm_rep_msg *) msg->mad; 1647 cm_format_rep(rep_msg, cm_id_priv, param); 1648 msg->timeout_ms = cm_id_priv->timeout_ms; 1649 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1650 1651 ret = ib_post_send_mad(msg, NULL); 1652 if (ret) { 1653 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1654 cm_free_msg(msg); 1655 return ret; 1656 } 1657 1658 cm_id->state = IB_CM_REP_SENT; 1659 cm_id_priv->msg = msg; 1660 cm_id_priv->initiator_depth = param->initiator_depth; 1661 cm_id_priv->responder_resources = param->responder_resources; 1662 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1663 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1664 1665out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1666 return ret; 1667} 1668EXPORT_SYMBOL(ib_send_cm_rep); 1669 1670static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1671 struct cm_id_private *cm_id_priv, 1672 const void *private_data, 1673 u8 private_data_len) 1674{ 1675 cm_format_m…
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