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 * $Id: cm.c 4311 2005-12-05 18:42:01Z sean.hefty $ 36 */ 37 38 #include <linux/completion.h> 39 #include <linux/dma-mapping.h> 40 #include <linux/device.h> 41 #include <linux/err.h> 42 #include <linux/idr.h> 43 #include <linux/interrupt.h> 44 #include <linux/random.h> 45 #include <linux/rbtree.h> 46 #include <linux/spinlock.h> 47 #include <linux/sysfs.h> 48 #include <linux/workqueue.h> 49 50 #include <rdma/ib_cache.h> 51 #include <rdma/ib_cm.h> 52 #include "cm_msgs.h" 53 54 MODULE_AUTHOR("Sean Hefty"); 55 MODULE_DESCRIPTION("InfiniBand CM"); 56 MODULE_LICENSE("Dual BSD/GPL"); 57 58 static void cm_add_one(struct ib_device *device); 59 static void cm_remove_one(struct ib_device *device); 60 61 static struct ib_client cm_client = { 62 .name = "cm", 63 .add = cm_add_one, 64 .remove = cm_remove_one 65 }; 66 67 static 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 */ 84 enum { 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 }; 99 100 enum { 101 CM_XMIT, 102 CM_XMIT_RETRIES, 103 CM_RECV, 104 CM_RECV_DUPLICATES, 105 CM_COUNTER_GROUPS 106 }; 107 108 static 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 }; 113 114 struct cm_counter_group { 115 struct kobject obj; 116 atomic_long_t counter[CM_ATTR_COUNT]; 117 }; 118 119 struct cm_counter_attribute { 120 struct attribute attr; 121 int index; 122 }; 123 124 #define CM_COUNTER_ATTR(_name, _index) \ 125 struct cm_counter_attribute cm_##_name##_counter_attr = { \ 126 .attr = { .name = __stringify(_name), .mode = 0444, .owner = THIS_MODULE }, \ 127 .index = _index \ 128 } 129 130 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER); 131 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER); 132 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER); 133 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER); 134 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER); 135 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER); 136 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER); 137 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER); 138 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER); 139 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER); 140 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER); 141 142 static 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 }; 156 157 struct 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 }; 164 165 struct cm_device { 166 struct list_head list; 167 struct ib_device *device; 168 struct kobject dev_obj; 169 u8 ack_delay; 170 struct cm_port *port[0]; 171 }; 172 173 struct 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 }; 180 181 struct 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 }; 191 192 struct 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 }; 202 203 struct 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 }; 242 243 static void cm_work_handler(struct work_struct *work); 244 245 static 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 } 250 251 static 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 } 281 282 static 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 } 305 306 static 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 } 313 314 static 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 } 328 329 static 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 } 338 339 static 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->device, port->port_num, wc, 345 grh, &av->ah_attr); 346 } 347 348 static 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->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->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->device, port->port_num, path, 376 &av->ah_attr); 377 av->timeout = path->packet_life_time + 1; 378 return 0; 379 } 380 381 static 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 } 399 400 static 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 } 407 408 static 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 } 423 424 static 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 } 434 435 static 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 } 443 444 static 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 } 457 458 static 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 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv) 471 { 472 struct rb_node **link = &cm.listen_service_table.rb_node; 473 struct rb_node *parent = NULL; 474 struct cm_id_private *cur_cm_id_priv; 475 __be64 service_id = cm_id_priv->id.service_id; 476 __be64 service_mask = cm_id_priv->id.service_mask; 477 int data_cmp; 478 479 while (*link) { 480 parent = *link; 481 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 482 service_node); 483 data_cmp = cm_compare_data(cm_id_priv->compare_data, 484 cur_cm_id_priv->compare_data); 485 if ((cur_cm_id_priv->id.service_mask & service_id) == 486 (service_mask & cur_cm_id_priv->id.service_id) && 487 (cm_id_priv->id.device == cur_cm_id_priv->id.device) && 488 !data_cmp) 489 return cur_cm_id_priv; 490 491 if (cm_id_priv->id.device < cur_cm_id_priv->id.device) 492 link = &(*link)->rb_left; 493 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device) 494 link = &(*link)->rb_right; 495 else if (service_id < cur_cm_id_priv->id.service_id) 496 link = &(*link)->rb_left; 497 else if (service_id > cur_cm_id_priv->id.service_id) 498 link = &(*link)->rb_right; 499 else if (data_cmp < 0) 500 link = &(*link)->rb_left; 501 else 502 link = &(*link)->rb_right; 503 } 504 rb_link_node(&cm_id_priv->service_node, parent, link); 505 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table); 506 return NULL; 507 } 508 509 static struct cm_id_private * cm_find_listen(struct ib_device *device, 510 __be64 service_id, 511 u8 *private_data) 512 { 513 struct rb_node *node = cm.listen_service_table.rb_node; 514 struct cm_id_private *cm_id_priv; 515 int data_cmp; 516 517 while (node) { 518 cm_id_priv = rb_entry(node, struct cm_id_private, service_node); 519 data_cmp = cm_compare_private_data(private_data, 520 cm_id_priv->compare_data); 521 if ((cm_id_priv->id.service_mask & service_id) == 522 cm_id_priv->id.service_id && 523 (cm_id_priv->id.device == device) && !data_cmp) 524 return cm_id_priv; 525 526 if (device < cm_id_priv->id.device) 527 node = node->rb_left; 528 else if (device > cm_id_priv->id.device) 529 node = node->rb_right; 530 else if (service_id < cm_id_priv->id.service_id) 531 node = node->rb_left; 532 else if (service_id > cm_id_priv->id.service_id) 533 node = node->rb_right; 534 else if (data_cmp < 0) 535 node = node->rb_left; 536 else 537 node = node->rb_right; 538 } 539 return NULL; 540 } 541 542 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info 543 *timewait_info) 544 { 545 struct rb_node **link = &cm.remote_id_table.rb_node; 546 struct rb_node *parent = NULL; 547 struct cm_timewait_info *cur_timewait_info; 548 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 549 __be32 remote_id = timewait_info->work.remote_id; 550 551 while (*link) { 552 parent = *link; 553 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 554 remote_id_node); 555 if (remote_id < cur_timewait_info->work.remote_id) 556 link = &(*link)->rb_left; 557 else if (remote_id > cur_timewait_info->work.remote_id) 558 link = &(*link)->rb_right; 559 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 560 link = &(*link)->rb_left; 561 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 562 link = &(*link)->rb_right; 563 else 564 return cur_timewait_info; 565 } 566 timewait_info->inserted_remote_id = 1; 567 rb_link_node(&timewait_info->remote_id_node, parent, link); 568 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table); 569 return NULL; 570 } 571 572 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid, 573 __be32 remote_id) 574 { 575 struct rb_node *node = cm.remote_id_table.rb_node; 576 struct cm_timewait_info *timewait_info; 577 578 while (node) { 579 timewait_info = rb_entry(node, struct cm_timewait_info, 580 remote_id_node); 581 if (remote_id < timewait_info->work.remote_id) 582 node = node->rb_left; 583 else if (remote_id > timewait_info->work.remote_id) 584 node = node->rb_right; 585 else if (remote_ca_guid < timewait_info->remote_ca_guid) 586 node = node->rb_left; 587 else if (remote_ca_guid > timewait_info->remote_ca_guid) 588 node = node->rb_right; 589 else 590 return timewait_info; 591 } 592 return NULL; 593 } 594 595 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info 596 *timewait_info) 597 { 598 struct rb_node **link = &cm.remote_qp_table.rb_node; 599 struct rb_node *parent = NULL; 600 struct cm_timewait_info *cur_timewait_info; 601 __be64 remote_ca_guid = timewait_info->remote_ca_guid; 602 __be32 remote_qpn = timewait_info->remote_qpn; 603 604 while (*link) { 605 parent = *link; 606 cur_timewait_info = rb_entry(parent, struct cm_timewait_info, 607 remote_qp_node); 608 if (remote_qpn < cur_timewait_info->remote_qpn) 609 link = &(*link)->rb_left; 610 else if (remote_qpn > cur_timewait_info->remote_qpn) 611 link = &(*link)->rb_right; 612 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid) 613 link = &(*link)->rb_left; 614 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid) 615 link = &(*link)->rb_right; 616 else 617 return cur_timewait_info; 618 } 619 timewait_info->inserted_remote_qp = 1; 620 rb_link_node(&timewait_info->remote_qp_node, parent, link); 621 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table); 622 return NULL; 623 } 624 625 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private 626 *cm_id_priv) 627 { 628 struct rb_node **link = &cm.remote_sidr_table.rb_node; 629 struct rb_node *parent = NULL; 630 struct cm_id_private *cur_cm_id_priv; 631 union ib_gid *port_gid = &cm_id_priv->av.dgid; 632 __be32 remote_id = cm_id_priv->id.remote_id; 633 634 while (*link) { 635 parent = *link; 636 cur_cm_id_priv = rb_entry(parent, struct cm_id_private, 637 sidr_id_node); 638 if (remote_id < cur_cm_id_priv->id.remote_id) 639 link = &(*link)->rb_left; 640 else if (remote_id > cur_cm_id_priv->id.remote_id) 641 link = &(*link)->rb_right; 642 else { 643 int cmp; 644 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid, 645 sizeof *port_gid); 646 if (cmp < 0) 647 link = &(*link)->rb_left; 648 else if (cmp > 0) 649 link = &(*link)->rb_right; 650 else 651 return cur_cm_id_priv; 652 } 653 } 654 rb_link_node(&cm_id_priv->sidr_id_node, parent, link); 655 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 656 return NULL; 657 } 658 659 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv, 660 enum ib_cm_sidr_status status) 661 { 662 struct ib_cm_sidr_rep_param param; 663 664 memset(¶m, 0, sizeof param); 665 param.status = status; 666 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m); 667 } 668 669 struct ib_cm_id *ib_create_cm_id(struct ib_device *device, 670 ib_cm_handler cm_handler, 671 void *context) 672 { 673 struct cm_id_private *cm_id_priv; 674 int ret; 675 676 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL); 677 if (!cm_id_priv) 678 return ERR_PTR(-ENOMEM); 679 680 cm_id_priv->id.state = IB_CM_IDLE; 681 cm_id_priv->id.device = device; 682 cm_id_priv->id.cm_handler = cm_handler; 683 cm_id_priv->id.context = context; 684 cm_id_priv->id.remote_cm_qpn = 1; 685 ret = cm_alloc_id(cm_id_priv); 686 if (ret) 687 goto error; 688 689 spin_lock_init(&cm_id_priv->lock); 690 init_completion(&cm_id_priv->comp); 691 INIT_LIST_HEAD(&cm_id_priv->work_list); 692 atomic_set(&cm_id_priv->work_count, -1); 693 atomic_set(&cm_id_priv->refcount, 1); 694 return &cm_id_priv->id; 695 696 error: 697 kfree(cm_id_priv); 698 return ERR_PTR(-ENOMEM); 699 } 700 EXPORT_SYMBOL(ib_create_cm_id); 701 702 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv) 703 { 704 struct cm_work *work; 705 706 if (list_empty(&cm_id_priv->work_list)) 707 return NULL; 708 709 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list); 710 list_del(&work->list); 711 return work; 712 } 713 714 static void cm_free_work(struct cm_work *work) 715 { 716 if (work->mad_recv_wc) 717 ib_free_recv_mad(work->mad_recv_wc); 718 kfree(work); 719 } 720 721 static inline int cm_convert_to_ms(int iba_time) 722 { 723 /* approximate conversion to ms from 4.096us x 2^iba_time */ 724 return 1 << max(iba_time - 8, 0); 725 } 726 727 /* 728 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time 729 * Because of how ack_timeout is stored, adding one doubles the timeout. 730 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and 731 * increment it (round up) only if the other is within 50%. 732 */ 733 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time) 734 { 735 int ack_timeout = packet_life_time + 1; 736 737 if (ack_timeout >= ca_ack_delay) 738 ack_timeout += (ca_ack_delay >= (ack_timeout - 1)); 739 else 740 ack_timeout = ca_ack_delay + 741 (ack_timeout >= (ca_ack_delay - 1)); 742 743 return min(31, ack_timeout); 744 } 745 746 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info) 747 { 748 if (timewait_info->inserted_remote_id) { 749 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table); 750 timewait_info->inserted_remote_id = 0; 751 } 752 753 if (timewait_info->inserted_remote_qp) { 754 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table); 755 timewait_info->inserted_remote_qp = 0; 756 } 757 } 758 759 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id) 760 { 761 struct cm_timewait_info *timewait_info; 762 763 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL); 764 if (!timewait_info) 765 return ERR_PTR(-ENOMEM); 766 767 timewait_info->work.local_id = local_id; 768 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler); 769 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT; 770 return timewait_info; 771 } 772 773 static void cm_enter_timewait(struct cm_id_private *cm_id_priv) 774 { 775 int wait_time; 776 unsigned long flags; 777 778 spin_lock_irqsave(&cm.lock, flags); 779 cm_cleanup_timewait(cm_id_priv->timewait_info); 780 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list); 781 spin_unlock_irqrestore(&cm.lock, flags); 782 783 /* 784 * The cm_id could be destroyed by the user before we exit timewait. 785 * To protect against this, we search for the cm_id after exiting 786 * timewait before notifying the user that we've exited timewait. 787 */ 788 cm_id_priv->id.state = IB_CM_TIMEWAIT; 789 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout); 790 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work, 791 msecs_to_jiffies(wait_time)); 792 cm_id_priv->timewait_info = NULL; 793 } 794 795 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv) 796 { 797 unsigned long flags; 798 799 cm_id_priv->id.state = IB_CM_IDLE; 800 if (cm_id_priv->timewait_info) { 801 spin_lock_irqsave(&cm.lock, flags); 802 cm_cleanup_timewait(cm_id_priv->timewait_info); 803 spin_unlock_irqrestore(&cm.lock, flags); 804 kfree(cm_id_priv->timewait_info); 805 cm_id_priv->timewait_info = NULL; 806 } 807 } 808 809 static void cm_destroy_id(struct ib_cm_id *cm_id, int err) 810 { 811 struct cm_id_private *cm_id_priv; 812 struct cm_work *work; 813 814 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 815 retest: 816 spin_lock_irq(&cm_id_priv->lock); 817 switch (cm_id->state) { 818 case IB_CM_LISTEN: 819 cm_id->state = IB_CM_IDLE; 820 spin_unlock_irq(&cm_id_priv->lock); 821 spin_lock_irq(&cm.lock); 822 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table); 823 spin_unlock_irq(&cm.lock); 824 break; 825 case IB_CM_SIDR_REQ_SENT: 826 cm_id->state = IB_CM_IDLE; 827 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 828 spin_unlock_irq(&cm_id_priv->lock); 829 break; 830 case IB_CM_SIDR_REQ_RCVD: 831 spin_unlock_irq(&cm_id_priv->lock); 832 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT); 833 break; 834 case IB_CM_REQ_SENT: 835 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 836 spin_unlock_irq(&cm_id_priv->lock); 837 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT, 838 &cm_id_priv->id.device->node_guid, 839 sizeof cm_id_priv->id.device->node_guid, 840 NULL, 0); 841 break; 842 case IB_CM_REQ_RCVD: 843 if (err == -ENOMEM) { 844 /* Do not reject to allow future retries. */ 845 cm_reset_to_idle(cm_id_priv); 846 spin_unlock_irq(&cm_id_priv->lock); 847 } else { 848 spin_unlock_irq(&cm_id_priv->lock); 849 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 850 NULL, 0, NULL, 0); 851 } 852 break; 853 case IB_CM_MRA_REQ_RCVD: 854 case IB_CM_REP_SENT: 855 case IB_CM_MRA_REP_RCVD: 856 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 857 /* Fall through */ 858 case IB_CM_MRA_REQ_SENT: 859 case IB_CM_REP_RCVD: 860 case IB_CM_MRA_REP_SENT: 861 spin_unlock_irq(&cm_id_priv->lock); 862 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, 863 NULL, 0, NULL, 0); 864 break; 865 case IB_CM_ESTABLISHED: 866 spin_unlock_irq(&cm_id_priv->lock); 867 ib_send_cm_dreq(cm_id, NULL, 0); 868 goto retest; 869 case IB_CM_DREQ_SENT: 870 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 871 cm_enter_timewait(cm_id_priv); 872 spin_unlock_irq(&cm_id_priv->lock); 873 break; 874 case IB_CM_DREQ_RCVD: 875 spin_unlock_irq(&cm_id_priv->lock); 876 ib_send_cm_drep(cm_id, NULL, 0); 877 break; 878 default: 879 spin_unlock_irq(&cm_id_priv->lock); 880 break; 881 } 882 883 cm_free_id(cm_id->local_id); 884 cm_deref_id(cm_id_priv); 885 wait_for_completion(&cm_id_priv->comp); 886 while ((work = cm_dequeue_work(cm_id_priv)) != NULL) 887 cm_free_work(work); 888 kfree(cm_id_priv->compare_data); 889 kfree(cm_id_priv->private_data); 890 kfree(cm_id_priv); 891 } 892 893 void ib_destroy_cm_id(struct ib_cm_id *cm_id) 894 { 895 cm_destroy_id(cm_id, 0); 896 } 897 EXPORT_SYMBOL(ib_destroy_cm_id); 898 899 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask, 900 struct ib_cm_compare_data *compare_data) 901 { 902 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 903 unsigned long flags; 904 int ret = 0; 905 906 service_mask = service_mask ? service_mask : 907 __constant_cpu_to_be64(~0ULL); 908 service_id &= service_mask; 909 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID && 910 (service_id != IB_CM_ASSIGN_SERVICE_ID)) 911 return -EINVAL; 912 913 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 914 if (cm_id->state != IB_CM_IDLE) 915 return -EINVAL; 916 917 if (compare_data) { 918 cm_id_priv->compare_data = kzalloc(sizeof *compare_data, 919 GFP_KERNEL); 920 if (!cm_id_priv->compare_data) 921 return -ENOMEM; 922 cm_mask_copy(cm_id_priv->compare_data->data, 923 compare_data->data, compare_data->mask); 924 memcpy(cm_id_priv->compare_data->mask, compare_data->mask, 925 IB_CM_COMPARE_SIZE); 926 } 927 928 cm_id->state = IB_CM_LISTEN; 929 930 spin_lock_irqsave(&cm.lock, flags); 931 if (service_id == IB_CM_ASSIGN_SERVICE_ID) { 932 cm_id->service_id = cpu_to_be64(cm.listen_service_id++); 933 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 934 } else { 935 cm_id->service_id = service_id; 936 cm_id->service_mask = service_mask; 937 } 938 cur_cm_id_priv = cm_insert_listen(cm_id_priv); 939 spin_unlock_irqrestore(&cm.lock, flags); 940 941 if (cur_cm_id_priv) { 942 cm_id->state = IB_CM_IDLE; 943 kfree(cm_id_priv->compare_data); 944 cm_id_priv->compare_data = NULL; 945 ret = -EBUSY; 946 } 947 return ret; 948 } 949 EXPORT_SYMBOL(ib_cm_listen); 950 951 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv, 952 enum cm_msg_sequence msg_seq) 953 { 954 u64 hi_tid, low_tid; 955 956 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32; 957 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id | 958 (msg_seq << 30)); 959 return cpu_to_be64(hi_tid | low_tid); 960 } 961 962 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr, 963 __be16 attr_id, __be64 tid) 964 { 965 hdr->base_version = IB_MGMT_BASE_VERSION; 966 hdr->mgmt_class = IB_MGMT_CLASS_CM; 967 hdr->class_version = IB_CM_CLASS_VERSION; 968 hdr->method = IB_MGMT_METHOD_SEND; 969 hdr->attr_id = attr_id; 970 hdr->tid = tid; 971 } 972 973 static void cm_format_req(struct cm_req_msg *req_msg, 974 struct cm_id_private *cm_id_priv, 975 struct ib_cm_req_param *param) 976 { 977 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID, 978 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ)); 979 980 req_msg->local_comm_id = cm_id_priv->id.local_id; 981 req_msg->service_id = param->service_id; 982 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 983 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num)); 984 cm_req_set_resp_res(req_msg, param->responder_resources); 985 cm_req_set_init_depth(req_msg, param->initiator_depth); 986 cm_req_set_remote_resp_timeout(req_msg, 987 param->remote_cm_response_timeout); 988 cm_req_set_qp_type(req_msg, param->qp_type); 989 cm_req_set_flow_ctrl(req_msg, param->flow_control); 990 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn)); 991 cm_req_set_local_resp_timeout(req_msg, 992 param->local_cm_response_timeout); 993 cm_req_set_retry_count(req_msg, param->retry_count); 994 req_msg->pkey = param->primary_path->pkey; 995 cm_req_set_path_mtu(req_msg, param->primary_path->mtu); 996 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count); 997 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries); 998 cm_req_set_srq(req_msg, param->srq); 999 1000 req_msg->primary_local_lid = param->primary_path->slid; 1001 req_msg->primary_remote_lid = param->primary_path->dlid; 1002 req_msg->primary_local_gid = param->primary_path->sgid; 1003 req_msg->primary_remote_gid = param->primary_path->dgid; 1004 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label); 1005 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate); 1006 req_msg->primary_traffic_class = param->primary_path->traffic_class; 1007 req_msg->primary_hop_limit = param->primary_path->hop_limit; 1008 cm_req_set_primary_sl(req_msg, param->primary_path->sl); 1009 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */ 1010 cm_req_set_primary_local_ack_timeout(req_msg, 1011 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1012 param->primary_path->packet_life_time)); 1013 1014 if (param->alternate_path) { 1015 req_msg->alt_local_lid = param->alternate_path->slid; 1016 req_msg->alt_remote_lid = param->alternate_path->dlid; 1017 req_msg->alt_local_gid = param->alternate_path->sgid; 1018 req_msg->alt_remote_gid = param->alternate_path->dgid; 1019 cm_req_set_alt_flow_label(req_msg, 1020 param->alternate_path->flow_label); 1021 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate); 1022 req_msg->alt_traffic_class = param->alternate_path->traffic_class; 1023 req_msg->alt_hop_limit = param->alternate_path->hop_limit; 1024 cm_req_set_alt_sl(req_msg, param->alternate_path->sl); 1025 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */ 1026 cm_req_set_alt_local_ack_timeout(req_msg, 1027 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 1028 param->alternate_path->packet_life_time)); 1029 } 1030 1031 if (param->private_data && param->private_data_len) 1032 memcpy(req_msg->private_data, param->private_data, 1033 param->private_data_len); 1034 } 1035 1036 static int cm_validate_req_param(struct ib_cm_req_param *param) 1037 { 1038 /* peer-to-peer not supported */ 1039 if (param->peer_to_peer) 1040 return -EINVAL; 1041 1042 if (!param->primary_path) 1043 return -EINVAL; 1044 1045 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC) 1046 return -EINVAL; 1047 1048 if (param->private_data && 1049 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE) 1050 return -EINVAL; 1051 1052 if (param->alternate_path && 1053 (param->alternate_path->pkey != param->primary_path->pkey || 1054 param->alternate_path->mtu != param->primary_path->mtu)) 1055 return -EINVAL; 1056 1057 return 0; 1058 } 1059 1060 int ib_send_cm_req(struct ib_cm_id *cm_id, 1061 struct ib_cm_req_param *param) 1062 { 1063 struct cm_id_private *cm_id_priv; 1064 struct cm_req_msg *req_msg; 1065 unsigned long flags; 1066 int ret; 1067 1068 ret = cm_validate_req_param(param); 1069 if (ret) 1070 return ret; 1071 1072 /* Verify that we're not in timewait. */ 1073 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1074 spin_lock_irqsave(&cm_id_priv->lock, flags); 1075 if (cm_id->state != IB_CM_IDLE) { 1076 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1077 ret = -EINVAL; 1078 goto out; 1079 } 1080 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1081 1082 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1083 id.local_id); 1084 if (IS_ERR(cm_id_priv->timewait_info)) { 1085 ret = PTR_ERR(cm_id_priv->timewait_info); 1086 goto out; 1087 } 1088 1089 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av); 1090 if (ret) 1091 goto error1; 1092 if (param->alternate_path) { 1093 ret = cm_init_av_by_path(param->alternate_path, 1094 &cm_id_priv->alt_av); 1095 if (ret) 1096 goto error1; 1097 } 1098 cm_id->service_id = param->service_id; 1099 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 1100 cm_id_priv->timeout_ms = cm_convert_to_ms( 1101 param->primary_path->packet_life_time) * 2 + 1102 cm_convert_to_ms( 1103 param->remote_cm_response_timeout); 1104 cm_id_priv->max_cm_retries = param->max_cm_retries; 1105 cm_id_priv->initiator_depth = param->initiator_depth; 1106 cm_id_priv->responder_resources = param->responder_resources; 1107 cm_id_priv->retry_count = param->retry_count; 1108 cm_id_priv->path_mtu = param->primary_path->mtu; 1109 cm_id_priv->pkey = param->primary_path->pkey; 1110 cm_id_priv->qp_type = param->qp_type; 1111 1112 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg); 1113 if (ret) 1114 goto error1; 1115 1116 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad; 1117 cm_format_req(req_msg, cm_id_priv, param); 1118 cm_id_priv->tid = req_msg->hdr.tid; 1119 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms; 1120 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT; 1121 1122 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg); 1123 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg); 1124 1125 spin_lock_irqsave(&cm_id_priv->lock, flags); 1126 ret = ib_post_send_mad(cm_id_priv->msg, NULL); 1127 if (ret) { 1128 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1129 goto error2; 1130 } 1131 BUG_ON(cm_id->state != IB_CM_IDLE); 1132 cm_id->state = IB_CM_REQ_SENT; 1133 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1134 return 0; 1135 1136 error2: cm_free_msg(cm_id_priv->msg); 1137 error1: kfree(cm_id_priv->timewait_info); 1138 out: return ret; 1139 } 1140 EXPORT_SYMBOL(ib_send_cm_req); 1141 1142 static int cm_issue_rej(struct cm_port *port, 1143 struct ib_mad_recv_wc *mad_recv_wc, 1144 enum ib_cm_rej_reason reason, 1145 enum cm_msg_response msg_rejected, 1146 void *ari, u8 ari_length) 1147 { 1148 struct ib_mad_send_buf *msg = NULL; 1149 struct cm_rej_msg *rej_msg, *rcv_msg; 1150 int ret; 1151 1152 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 1153 if (ret) 1154 return ret; 1155 1156 /* We just need common CM header information. Cast to any message. */ 1157 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad; 1158 rej_msg = (struct cm_rej_msg *) msg->mad; 1159 1160 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid); 1161 rej_msg->remote_comm_id = rcv_msg->local_comm_id; 1162 rej_msg->local_comm_id = rcv_msg->remote_comm_id; 1163 cm_rej_set_msg_rejected(rej_msg, msg_rejected); 1164 rej_msg->reason = cpu_to_be16(reason); 1165 1166 if (ari && ari_length) { 1167 cm_rej_set_reject_info_len(rej_msg, ari_length); 1168 memcpy(rej_msg->ari, ari, ari_length); 1169 } 1170 1171 ret = ib_post_send_mad(msg, NULL); 1172 if (ret) 1173 cm_free_msg(msg); 1174 1175 return ret; 1176 } 1177 1178 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid, 1179 __be32 local_qpn, __be32 remote_qpn) 1180 { 1181 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) || 1182 ((local_ca_guid == remote_ca_guid) && 1183 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn)))); 1184 } 1185 1186 static void cm_format_paths_from_req(struct cm_req_msg *req_msg, 1187 struct ib_sa_path_rec *primary_path, 1188 struct ib_sa_path_rec *alt_path) 1189 { 1190 memset(primary_path, 0, sizeof *primary_path); 1191 primary_path->dgid = req_msg->primary_local_gid; 1192 primary_path->sgid = req_msg->primary_remote_gid; 1193 primary_path->dlid = req_msg->primary_local_lid; 1194 primary_path->slid = req_msg->primary_remote_lid; 1195 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg); 1196 primary_path->hop_limit = req_msg->primary_hop_limit; 1197 primary_path->traffic_class = req_msg->primary_traffic_class; 1198 primary_path->reversible = 1; 1199 primary_path->pkey = req_msg->pkey; 1200 primary_path->sl = cm_req_get_primary_sl(req_msg); 1201 primary_path->mtu_selector = IB_SA_EQ; 1202 primary_path->mtu = cm_req_get_path_mtu(req_msg); 1203 primary_path->rate_selector = IB_SA_EQ; 1204 primary_path->rate = cm_req_get_primary_packet_rate(req_msg); 1205 primary_path->packet_life_time_selector = IB_SA_EQ; 1206 primary_path->packet_life_time = 1207 cm_req_get_primary_local_ack_timeout(req_msg); 1208 primary_path->packet_life_time -= (primary_path->packet_life_time > 0); 1209 1210 if (req_msg->alt_local_lid) { 1211 memset(alt_path, 0, sizeof *alt_path); 1212 alt_path->dgid = req_msg->alt_local_gid; 1213 alt_path->sgid = req_msg->alt_remote_gid; 1214 alt_path->dlid = req_msg->alt_local_lid; 1215 alt_path->slid = req_msg->alt_remote_lid; 1216 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg); 1217 alt_path->hop_limit = req_msg->alt_hop_limit; 1218 alt_path->traffic_class = req_msg->alt_traffic_class; 1219 alt_path->reversible = 1; 1220 alt_path->pkey = req_msg->pkey; 1221 alt_path->sl = cm_req_get_alt_sl(req_msg); 1222 alt_path->mtu_selector = IB_SA_EQ; 1223 alt_path->mtu = cm_req_get_path_mtu(req_msg); 1224 alt_path->rate_selector = IB_SA_EQ; 1225 alt_path->rate = cm_req_get_alt_packet_rate(req_msg); 1226 alt_path->packet_life_time_selector = IB_SA_EQ; 1227 alt_path->packet_life_time = 1228 cm_req_get_alt_local_ack_timeout(req_msg); 1229 alt_path->packet_life_time -= (alt_path->packet_life_time > 0); 1230 } 1231 } 1232 1233 static void cm_format_req_event(struct cm_work *work, 1234 struct cm_id_private *cm_id_priv, 1235 struct ib_cm_id *listen_id) 1236 { 1237 struct cm_req_msg *req_msg; 1238 struct ib_cm_req_event_param *param; 1239 1240 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1241 param = &work->cm_event.param.req_rcvd; 1242 param->listen_id = listen_id; 1243 param->port = cm_id_priv->av.port->port_num; 1244 param->primary_path = &work->path[0]; 1245 if (req_msg->alt_local_lid) 1246 param->alternate_path = &work->path[1]; 1247 else 1248 param->alternate_path = NULL; 1249 param->remote_ca_guid = req_msg->local_ca_guid; 1250 param->remote_qkey = be32_to_cpu(req_msg->local_qkey); 1251 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg)); 1252 param->qp_type = cm_req_get_qp_type(req_msg); 1253 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg)); 1254 param->responder_resources = cm_req_get_init_depth(req_msg); 1255 param->initiator_depth = cm_req_get_resp_res(req_msg); 1256 param->local_cm_response_timeout = 1257 cm_req_get_remote_resp_timeout(req_msg); 1258 param->flow_control = cm_req_get_flow_ctrl(req_msg); 1259 param->remote_cm_response_timeout = 1260 cm_req_get_local_resp_timeout(req_msg); 1261 param->retry_count = cm_req_get_retry_count(req_msg); 1262 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1263 param->srq = cm_req_get_srq(req_msg); 1264 work->cm_event.private_data = &req_msg->private_data; 1265 } 1266 1267 static void cm_process_work(struct cm_id_private *cm_id_priv, 1268 struct cm_work *work) 1269 { 1270 int ret; 1271 1272 /* We will typically only have the current event to report. */ 1273 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event); 1274 cm_free_work(work); 1275 1276 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) { 1277 spin_lock_irq(&cm_id_priv->lock); 1278 work = cm_dequeue_work(cm_id_priv); 1279 spin_unlock_irq(&cm_id_priv->lock); 1280 BUG_ON(!work); 1281 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, 1282 &work->cm_event); 1283 cm_free_work(work); 1284 } 1285 cm_deref_id(cm_id_priv); 1286 if (ret) 1287 cm_destroy_id(&cm_id_priv->id, ret); 1288 } 1289 1290 static void cm_format_mra(struct cm_mra_msg *mra_msg, 1291 struct cm_id_private *cm_id_priv, 1292 enum cm_msg_response msg_mraed, u8 service_timeout, 1293 const void *private_data, u8 private_data_len) 1294 { 1295 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid); 1296 cm_mra_set_msg_mraed(mra_msg, msg_mraed); 1297 mra_msg->local_comm_id = cm_id_priv->id.local_id; 1298 mra_msg->remote_comm_id = cm_id_priv->id.remote_id; 1299 cm_mra_set_service_timeout(mra_msg, service_timeout); 1300 1301 if (private_data && private_data_len) 1302 memcpy(mra_msg->private_data, private_data, private_data_len); 1303 } 1304 1305 static void cm_format_rej(struct cm_rej_msg *rej_msg, 1306 struct cm_id_private *cm_id_priv, 1307 enum ib_cm_rej_reason reason, 1308 void *ari, 1309 u8 ari_length, 1310 const void *private_data, 1311 u8 private_data_len) 1312 { 1313 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid); 1314 rej_msg->remote_comm_id = cm_id_priv->id.remote_id; 1315 1316 switch(cm_id_priv->id.state) { 1317 case IB_CM_REQ_RCVD: 1318 rej_msg->local_comm_id = 0; 1319 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1320 break; 1321 case IB_CM_MRA_REQ_SENT: 1322 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1323 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ); 1324 break; 1325 case IB_CM_REP_RCVD: 1326 case IB_CM_MRA_REP_SENT: 1327 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1328 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP); 1329 break; 1330 default: 1331 rej_msg->local_comm_id = cm_id_priv->id.local_id; 1332 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER); 1333 break; 1334 } 1335 1336 rej_msg->reason = cpu_to_be16(reason); 1337 if (ari && ari_length) { 1338 cm_rej_set_reject_info_len(rej_msg, ari_length); 1339 memcpy(rej_msg->ari, ari, ari_length); 1340 } 1341 1342 if (private_data && private_data_len) 1343 memcpy(rej_msg->private_data, private_data, private_data_len); 1344 } 1345 1346 static void cm_dup_req_handler(struct cm_work *work, 1347 struct cm_id_private *cm_id_priv) 1348 { 1349 struct ib_mad_send_buf *msg = NULL; 1350 int ret; 1351 1352 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1353 counter[CM_REQ_COUNTER]); 1354 1355 /* Quick state check to discard duplicate REQs. */ 1356 if (cm_id_priv->id.state == IB_CM_REQ_RCVD) 1357 return; 1358 1359 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1360 if (ret) 1361 return; 1362 1363 spin_lock_irq(&cm_id_priv->lock); 1364 switch (cm_id_priv->id.state) { 1365 case IB_CM_MRA_REQ_SENT: 1366 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1367 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout, 1368 cm_id_priv->private_data, 1369 cm_id_priv->private_data_len); 1370 break; 1371 case IB_CM_TIMEWAIT: 1372 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv, 1373 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0); 1374 break; 1375 default: 1376 goto unlock; 1377 } 1378 spin_unlock_irq(&cm_id_priv->lock); 1379 1380 ret = ib_post_send_mad(msg, NULL); 1381 if (ret) 1382 goto free; 1383 return; 1384 1385 unlock: spin_unlock_irq(&cm_id_priv->lock); 1386 free: cm_free_msg(msg); 1387 } 1388 1389 static struct cm_id_private * cm_match_req(struct cm_work *work, 1390 struct cm_id_private *cm_id_priv) 1391 { 1392 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv; 1393 struct cm_timewait_info *timewait_info; 1394 struct cm_req_msg *req_msg; 1395 1396 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1397 1398 /* Check for possible duplicate REQ. */ 1399 spin_lock_irq(&cm.lock); 1400 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info); 1401 if (timewait_info) { 1402 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id, 1403 timewait_info->work.remote_id); 1404 spin_unlock_irq(&cm.lock); 1405 if (cur_cm_id_priv) { 1406 cm_dup_req_handler(work, cur_cm_id_priv); 1407 cm_deref_id(cur_cm_id_priv); 1408 } 1409 return NULL; 1410 } 1411 1412 /* Check for stale connections. */ 1413 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info); 1414 if (timewait_info) { 1415 cm_cleanup_timewait(cm_id_priv->timewait_info); 1416 spin_unlock_irq(&cm.lock); 1417 cm_issue_rej(work->port, work->mad_recv_wc, 1418 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ, 1419 NULL, 0); 1420 return NULL; 1421 } 1422 1423 /* Find matching listen request. */ 1424 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device, 1425 req_msg->service_id, 1426 req_msg->private_data); 1427 if (!listen_cm_id_priv) { 1428 cm_cleanup_timewait(cm_id_priv->timewait_info); 1429 spin_unlock_irq(&cm.lock); 1430 cm_issue_rej(work->port, work->mad_recv_wc, 1431 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ, 1432 NULL, 0); 1433 goto out; 1434 } 1435 atomic_inc(&listen_cm_id_priv->refcount); 1436 atomic_inc(&cm_id_priv->refcount); 1437 cm_id_priv->id.state = IB_CM_REQ_RCVD; 1438 atomic_inc(&cm_id_priv->work_count); 1439 spin_unlock_irq(&cm.lock); 1440 out: 1441 return listen_cm_id_priv; 1442 } 1443 1444 static int cm_req_handler(struct cm_work *work) 1445 { 1446 struct ib_cm_id *cm_id; 1447 struct cm_id_private *cm_id_priv, *listen_cm_id_priv; 1448 struct cm_req_msg *req_msg; 1449 int ret; 1450 1451 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad; 1452 1453 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 1454 if (IS_ERR(cm_id)) 1455 return PTR_ERR(cm_id); 1456 1457 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1458 cm_id_priv->id.remote_id = req_msg->local_comm_id; 1459 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 1460 work->mad_recv_wc->recv_buf.grh, 1461 &cm_id_priv->av); 1462 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv-> 1463 id.local_id); 1464 if (IS_ERR(cm_id_priv->timewait_info)) { 1465 ret = PTR_ERR(cm_id_priv->timewait_info); 1466 goto destroy; 1467 } 1468 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id; 1469 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid; 1470 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg); 1471 1472 listen_cm_id_priv = cm_match_req(work, cm_id_priv); 1473 if (!listen_cm_id_priv) { 1474 ret = -EINVAL; 1475 kfree(cm_id_priv->timewait_info); 1476 goto destroy; 1477 } 1478 1479 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler; 1480 cm_id_priv->id.context = listen_cm_id_priv->id.context; 1481 cm_id_priv->id.service_id = req_msg->service_id; 1482 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 1483 1484 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]); 1485 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av); 1486 if (ret) { 1487 ib_get_cached_gid(work->port->cm_dev->device, 1488 work->port->port_num, 0, &work->path[0].sgid); 1489 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID, 1490 &work->path[0].sgid, sizeof work->path[0].sgid, 1491 NULL, 0); 1492 goto rejected; 1493 } 1494 if (req_msg->alt_local_lid) { 1495 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av); 1496 if (ret) { 1497 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID, 1498 &work->path[0].sgid, 1499 sizeof work->path[0].sgid, NULL, 0); 1500 goto rejected; 1501 } 1502 } 1503 cm_id_priv->tid = req_msg->hdr.tid; 1504 cm_id_priv->timeout_ms = cm_convert_to_ms( 1505 cm_req_get_local_resp_timeout(req_msg)); 1506 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg); 1507 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg); 1508 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg); 1509 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg); 1510 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg); 1511 cm_id_priv->pkey = req_msg->pkey; 1512 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg); 1513 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg); 1514 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg); 1515 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg); 1516 1517 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id); 1518 cm_process_work(cm_id_priv, work); 1519 cm_deref_id(listen_cm_id_priv); 1520 return 0; 1521 1522 rejected: 1523 atomic_dec(&cm_id_priv->refcount); 1524 cm_deref_id(listen_cm_id_priv); 1525 destroy: 1526 ib_destroy_cm_id(cm_id); 1527 return ret; 1528 } 1529 1530 static void cm_format_rep(struct cm_rep_msg *rep_msg, 1531 struct cm_id_private *cm_id_priv, 1532 struct ib_cm_rep_param *param) 1533 { 1534 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid); 1535 rep_msg->local_comm_id = cm_id_priv->id.local_id; 1536 rep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1537 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num)); 1538 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn)); 1539 rep_msg->resp_resources = param->responder_resources; 1540 rep_msg->initiator_depth = param->initiator_depth; 1541 cm_rep_set_target_ack_delay(rep_msg, 1542 cm_id_priv->av.port->cm_dev->ack_delay); 1543 cm_rep_set_failover(rep_msg, param->failover_accepted); 1544 cm_rep_set_flow_ctrl(rep_msg, param->flow_control); 1545 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count); 1546 cm_rep_set_srq(rep_msg, param->srq); 1547 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid; 1548 1549 if (param->private_data && param->private_data_len) 1550 memcpy(rep_msg->private_data, param->private_data, 1551 param->private_data_len); 1552 } 1553 1554 int ib_send_cm_rep(struct ib_cm_id *cm_id, 1555 struct ib_cm_rep_param *param) 1556 { 1557 struct cm_id_private *cm_id_priv; 1558 struct ib_mad_send_buf *msg; 1559 struct cm_rep_msg *rep_msg; 1560 unsigned long flags; 1561 int ret; 1562 1563 if (param->private_data && 1564 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE) 1565 return -EINVAL; 1566 1567 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1568 spin_lock_irqsave(&cm_id_priv->lock, flags); 1569 if (cm_id->state != IB_CM_REQ_RCVD && 1570 cm_id->state != IB_CM_MRA_REQ_SENT) { 1571 ret = -EINVAL; 1572 goto out; 1573 } 1574 1575 ret = cm_alloc_msg(cm_id_priv, &msg); 1576 if (ret) 1577 goto out; 1578 1579 rep_msg = (struct cm_rep_msg *) msg->mad; 1580 cm_format_rep(rep_msg, cm_id_priv, param); 1581 msg->timeout_ms = cm_id_priv->timeout_ms; 1582 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT; 1583 1584 ret = ib_post_send_mad(msg, NULL); 1585 if (ret) { 1586 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1587 cm_free_msg(msg); 1588 return ret; 1589 } 1590 1591 cm_id->state = IB_CM_REP_SENT; 1592 cm_id_priv->msg = msg; 1593 cm_id_priv->initiator_depth = param->initiator_depth; 1594 cm_id_priv->responder_resources = param->responder_resources; 1595 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg); 1596 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg); 1597 1598 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1599 return ret; 1600 } 1601 EXPORT_SYMBOL(ib_send_cm_rep); 1602 1603 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg, 1604 struct cm_id_private *cm_id_priv, 1605 const void *private_data, 1606 u8 private_data_len) 1607 { 1608 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid); 1609 rtu_msg->local_comm_id = cm_id_priv->id.local_id; 1610 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id; 1611 1612 if (private_data && private_data_len) 1613 memcpy(rtu_msg->private_data, private_data, private_data_len); 1614 } 1615 1616 int ib_send_cm_rtu(struct ib_cm_id *cm_id, 1617 const void *private_data, 1618 u8 private_data_len) 1619 { 1620 struct cm_id_private *cm_id_priv; 1621 struct ib_mad_send_buf *msg; 1622 unsigned long flags; 1623 void *data; 1624 int ret; 1625 1626 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE) 1627 return -EINVAL; 1628 1629 data = cm_copy_private_data(private_data, private_data_len); 1630 if (IS_ERR(data)) 1631 return PTR_ERR(data); 1632 1633 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1634 spin_lock_irqsave(&cm_id_priv->lock, flags); 1635 if (cm_id->state != IB_CM_REP_RCVD && 1636 cm_id->state != IB_CM_MRA_REP_SENT) { 1637 ret = -EINVAL; 1638 goto error; 1639 } 1640 1641 ret = cm_alloc_msg(cm_id_priv, &msg); 1642 if (ret) 1643 goto error; 1644 1645 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1646 private_data, private_data_len); 1647 1648 ret = ib_post_send_mad(msg, NULL); 1649 if (ret) { 1650 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1651 cm_free_msg(msg); 1652 kfree(data); 1653 return ret; 1654 } 1655 1656 cm_id->state = IB_CM_ESTABLISHED; 1657 cm_set_private_data(cm_id_priv, data, private_data_len); 1658 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1659 return 0; 1660 1661 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1662 kfree(data); 1663 return ret; 1664 } 1665 EXPORT_SYMBOL(ib_send_cm_rtu); 1666 1667 static void cm_format_rep_event(struct cm_work *work) 1668 { 1669 struct cm_rep_msg *rep_msg; 1670 struct ib_cm_rep_event_param *param; 1671 1672 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1673 param = &work->cm_event.param.rep_rcvd; 1674 param->remote_ca_guid = rep_msg->local_ca_guid; 1675 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey); 1676 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg)); 1677 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg)); 1678 param->responder_resources = rep_msg->initiator_depth; 1679 param->initiator_depth = rep_msg->resp_resources; 1680 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1681 param->failover_accepted = cm_rep_get_failover(rep_msg); 1682 param->flow_control = cm_rep_get_flow_ctrl(rep_msg); 1683 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1684 param->srq = cm_rep_get_srq(rep_msg); 1685 work->cm_event.private_data = &rep_msg->private_data; 1686 } 1687 1688 static void cm_dup_rep_handler(struct cm_work *work) 1689 { 1690 struct cm_id_private *cm_id_priv; 1691 struct cm_rep_msg *rep_msg; 1692 struct ib_mad_send_buf *msg = NULL; 1693 int ret; 1694 1695 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad; 1696 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 1697 rep_msg->local_comm_id); 1698 if (!cm_id_priv) 1699 return; 1700 1701 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1702 counter[CM_REP_COUNTER]); 1703 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg); 1704 if (ret) 1705 goto deref; 1706 1707 spin_lock_irq(&cm_id_priv->lock); 1708 if (cm_id_priv->id.state == IB_CM_ESTABLISHED) 1709 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv, 1710 cm_id_priv->private_data, 1711 cm_id_priv->private_data_len); 1712 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT) 1713 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 1714 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout, 1715 cm_id_priv->private_data, 1716 cm_id_priv->private_data_len); 1717 else 1718 goto unlock; 1719 spin_unlock_irq(&cm_id_priv->lock); 1720 1721 ret = ib_post_send_mad(msg, NULL); 1722 if (ret) 1723 goto free; 1724 goto deref; 1725 1726 unlock: spin_unlock_irq(&cm_id_priv->lock); 1727 free: cm_free_msg(msg); 1728 deref: cm_deref_id(cm_id_priv); 1729 } 1730 1731 static int cm_rep_handler(struct cm_work *work) 1732 { 1733 struct cm_id_private *cm_id_priv; 1734 struct cm_rep_msg *rep_msg; 1735 int ret; 1736 1737 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad; 1738 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0); 1739 if (!cm_id_priv) { 1740 cm_dup_rep_handler(work); 1741 return -EINVAL; 1742 } 1743 1744 cm_format_rep_event(work); 1745 1746 spin_lock_irq(&cm_id_priv->lock); 1747 switch (cm_id_priv->id.state) { 1748 case IB_CM_REQ_SENT: 1749 case IB_CM_MRA_REQ_RCVD: 1750 break; 1751 default: 1752 spin_unlock_irq(&cm_id_priv->lock); 1753 ret = -EINVAL; 1754 goto error; 1755 } 1756 1757 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id; 1758 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid; 1759 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1760 1761 spin_lock(&cm.lock); 1762 /* Check for duplicate REP. */ 1763 if (cm_insert_remote_id(cm_id_priv->timewait_info)) { 1764 spin_unlock(&cm.lock); 1765 spin_unlock_irq(&cm_id_priv->lock); 1766 ret = -EINVAL; 1767 goto error; 1768 } 1769 /* Check for a stale connection. */ 1770 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) { 1771 rb_erase(&cm_id_priv->timewait_info->remote_id_node, 1772 &cm.remote_id_table); 1773 cm_id_priv->timewait_info->inserted_remote_id = 0; 1774 spin_unlock(&cm.lock); 1775 spin_unlock_irq(&cm_id_priv->lock); 1776 cm_issue_rej(work->port, work->mad_recv_wc, 1777 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP, 1778 NULL, 0); 1779 ret = -EINVAL; 1780 goto error; 1781 } 1782 spin_unlock(&cm.lock); 1783 1784 cm_id_priv->id.state = IB_CM_REP_RCVD; 1785 cm_id_priv->id.remote_id = rep_msg->local_comm_id; 1786 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg); 1787 cm_id_priv->initiator_depth = rep_msg->resp_resources; 1788 cm_id_priv->responder_resources = rep_msg->initiator_depth; 1789 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg); 1790 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg); 1791 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg); 1792 cm_id_priv->av.timeout = 1793 cm_ack_timeout(cm_id_priv->target_ack_delay, 1794 cm_id_priv->av.timeout - 1); 1795 cm_id_priv->alt_av.timeout = 1796 cm_ack_timeout(cm_id_priv->target_ack_delay, 1797 cm_id_priv->alt_av.timeout - 1); 1798 1799 /* todo: handle peer_to_peer */ 1800 1801 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1802 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1803 if (!ret) 1804 list_add_tail(&work->list, &cm_id_priv->work_list); 1805 spin_unlock_irq(&cm_id_priv->lock); 1806 1807 if (ret) 1808 cm_process_work(cm_id_priv, work); 1809 else 1810 cm_deref_id(cm_id_priv); 1811 return 0; 1812 1813 error: 1814 cm_deref_id(cm_id_priv); 1815 return ret; 1816 } 1817 1818 static int cm_establish_handler(struct cm_work *work) 1819 { 1820 struct cm_id_private *cm_id_priv; 1821 int ret; 1822 1823 /* See comment in cm_establish about lookup. */ 1824 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id); 1825 if (!cm_id_priv) 1826 return -EINVAL; 1827 1828 spin_lock_irq(&cm_id_priv->lock); 1829 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) { 1830 spin_unlock_irq(&cm_id_priv->lock); 1831 goto out; 1832 } 1833 1834 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1835 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1836 if (!ret) 1837 list_add_tail(&work->list, &cm_id_priv->work_list); 1838 spin_unlock_irq(&cm_id_priv->lock); 1839 1840 if (ret) 1841 cm_process_work(cm_id_priv, work); 1842 else 1843 cm_deref_id(cm_id_priv); 1844 return 0; 1845 out: 1846 cm_deref_id(cm_id_priv); 1847 return -EINVAL; 1848 } 1849 1850 static int cm_rtu_handler(struct cm_work *work) 1851 { 1852 struct cm_id_private *cm_id_priv; 1853 struct cm_rtu_msg *rtu_msg; 1854 int ret; 1855 1856 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad; 1857 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id, 1858 rtu_msg->local_comm_id); 1859 if (!cm_id_priv) 1860 return -EINVAL; 1861 1862 work->cm_event.private_data = &rtu_msg->private_data; 1863 1864 spin_lock_irq(&cm_id_priv->lock); 1865 if (cm_id_priv->id.state != IB_CM_REP_SENT && 1866 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) { 1867 spin_unlock_irq(&cm_id_priv->lock); 1868 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 1869 counter[CM_RTU_COUNTER]); 1870 goto out; 1871 } 1872 cm_id_priv->id.state = IB_CM_ESTABLISHED; 1873 1874 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 1875 ret = atomic_inc_and_test(&cm_id_priv->work_count); 1876 if (!ret) 1877 list_add_tail(&work->list, &cm_id_priv->work_list); 1878 spin_unlock_irq(&cm_id_priv->lock); 1879 1880 if (ret) 1881 cm_process_work(cm_id_priv, work); 1882 else 1883 cm_deref_id(cm_id_priv); 1884 return 0; 1885 out: 1886 cm_deref_id(cm_id_priv); 1887 return -EINVAL; 1888 } 1889 1890 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg, 1891 struct cm_id_private *cm_id_priv, 1892 const void *private_data, 1893 u8 private_data_len) 1894 { 1895 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID, 1896 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ)); 1897 dreq_msg->local_comm_id = cm_id_priv->id.local_id; 1898 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id; 1899 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn); 1900 1901 if (private_data && private_data_len) 1902 memcpy(dreq_msg->private_data, private_data, private_data_len); 1903 } 1904 1905 int ib_send_cm_dreq(struct ib_cm_id *cm_id, 1906 const void *private_data, 1907 u8 private_data_len) 1908 { 1909 struct cm_id_private *cm_id_priv; 1910 struct ib_mad_send_buf *msg; 1911 unsigned long flags; 1912 int ret; 1913 1914 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE) 1915 return -EINVAL; 1916 1917 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1918 spin_lock_irqsave(&cm_id_priv->lock, flags); 1919 if (cm_id->state != IB_CM_ESTABLISHED) { 1920 ret = -EINVAL; 1921 goto out; 1922 } 1923 1924 ret = cm_alloc_msg(cm_id_priv, &msg); 1925 if (ret) { 1926 cm_enter_timewait(cm_id_priv); 1927 goto out; 1928 } 1929 1930 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv, 1931 private_data, private_data_len); 1932 msg->timeout_ms = cm_id_priv->timeout_ms; 1933 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT; 1934 1935 ret = ib_post_send_mad(msg, NULL); 1936 if (ret) { 1937 cm_enter_timewait(cm_id_priv); 1938 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1939 cm_free_msg(msg); 1940 return ret; 1941 } 1942 1943 cm_id->state = IB_CM_DREQ_SENT; 1944 cm_id_priv->msg = msg; 1945 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1946 return ret; 1947 } 1948 EXPORT_SYMBOL(ib_send_cm_dreq); 1949 1950 static void cm_format_drep(struct cm_drep_msg *drep_msg, 1951 struct cm_id_private *cm_id_priv, 1952 const void *private_data, 1953 u8 private_data_len) 1954 { 1955 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid); 1956 drep_msg->local_comm_id = cm_id_priv->id.local_id; 1957 drep_msg->remote_comm_id = cm_id_priv->id.remote_id; 1958 1959 if (private_data && private_data_len) 1960 memcpy(drep_msg->private_data, private_data, private_data_len); 1961 } 1962 1963 int ib_send_cm_drep(struct ib_cm_id *cm_id, 1964 const void *private_data, 1965 u8 private_data_len) 1966 { 1967 struct cm_id_private *cm_id_priv; 1968 struct ib_mad_send_buf *msg; 1969 unsigned long flags; 1970 void *data; 1971 int ret; 1972 1973 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE) 1974 return -EINVAL; 1975 1976 data = cm_copy_private_data(private_data, private_data_len); 1977 if (IS_ERR(data)) 1978 return PTR_ERR(data); 1979 1980 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 1981 spin_lock_irqsave(&cm_id_priv->lock, flags); 1982 if (cm_id->state != IB_CM_DREQ_RCVD) { 1983 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 1984 kfree(data); 1985 return -EINVAL; 1986 } 1987 1988 cm_set_private_data(cm_id_priv, data, private_data_len); 1989 cm_enter_timewait(cm_id_priv); 1990 1991 ret = cm_alloc_msg(cm_id_priv, &msg); 1992 if (ret) 1993 goto out; 1994 1995 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 1996 private_data, private_data_len); 1997 1998 ret = ib_post_send_mad(msg, NULL); 1999 if (ret) { 2000 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2001 cm_free_msg(msg); 2002 return ret; 2003 } 2004 2005 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2006 return ret; 2007 } 2008 EXPORT_SYMBOL(ib_send_cm_drep); 2009 2010 static int cm_issue_drep(struct cm_port *port, 2011 struct ib_mad_recv_wc *mad_recv_wc) 2012 { 2013 struct ib_mad_send_buf *msg = NULL; 2014 struct cm_dreq_msg *dreq_msg; 2015 struct cm_drep_msg *drep_msg; 2016 int ret; 2017 2018 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg); 2019 if (ret) 2020 return ret; 2021 2022 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad; 2023 drep_msg = (struct cm_drep_msg *) msg->mad; 2024 2025 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid); 2026 drep_msg->remote_comm_id = dreq_msg->local_comm_id; 2027 drep_msg->local_comm_id = dreq_msg->remote_comm_id; 2028 2029 ret = ib_post_send_mad(msg, NULL); 2030 if (ret) 2031 cm_free_msg(msg); 2032 2033 return ret; 2034 } 2035 2036 static int cm_dreq_handler(struct cm_work *work) 2037 { 2038 struct cm_id_private *cm_id_priv; 2039 struct cm_dreq_msg *dreq_msg; 2040 struct ib_mad_send_buf *msg = NULL; 2041 int ret; 2042 2043 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad; 2044 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id, 2045 dreq_msg->local_comm_id); 2046 if (!cm_id_priv) { 2047 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2048 counter[CM_DREQ_COUNTER]); 2049 cm_issue_drep(work->port, work->mad_recv_wc); 2050 return -EINVAL; 2051 } 2052 2053 work->cm_event.private_data = &dreq_msg->private_data; 2054 2055 spin_lock_irq(&cm_id_priv->lock); 2056 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg)) 2057 goto unlock; 2058 2059 switch (cm_id_priv->id.state) { 2060 case IB_CM_REP_SENT: 2061 case IB_CM_DREQ_SENT: 2062 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2063 break; 2064 case IB_CM_ESTABLISHED: 2065 case IB_CM_MRA_REP_RCVD: 2066 break; 2067 case IB_CM_TIMEWAIT: 2068 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2069 counter[CM_DREQ_COUNTER]); 2070 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2071 goto unlock; 2072 2073 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv, 2074 cm_id_priv->private_data, 2075 cm_id_priv->private_data_len); 2076 spin_unlock_irq(&cm_id_priv->lock); 2077 2078 if (ib_post_send_mad(msg, NULL)) 2079 cm_free_msg(msg); 2080 goto deref; 2081 case IB_CM_DREQ_RCVD: 2082 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2083 counter[CM_DREQ_COUNTER]); 2084 goto unlock; 2085 default: 2086 goto unlock; 2087 } 2088 cm_id_priv->id.state = IB_CM_DREQ_RCVD; 2089 cm_id_priv->tid = dreq_msg->hdr.tid; 2090 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2091 if (!ret) 2092 list_add_tail(&work->list, &cm_id_priv->work_list); 2093 spin_unlock_irq(&cm_id_priv->lock); 2094 2095 if (ret) 2096 cm_process_work(cm_id_priv, work); 2097 else 2098 cm_deref_id(cm_id_priv); 2099 return 0; 2100 2101 unlock: spin_unlock_irq(&cm_id_priv->lock); 2102 deref: cm_deref_id(cm_id_priv); 2103 return -EINVAL; 2104 } 2105 2106 static int cm_drep_handler(struct cm_work *work) 2107 { 2108 struct cm_id_private *cm_id_priv; 2109 struct cm_drep_msg *drep_msg; 2110 int ret; 2111 2112 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad; 2113 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id, 2114 drep_msg->local_comm_id); 2115 if (!cm_id_priv) 2116 return -EINVAL; 2117 2118 work->cm_event.private_data = &drep_msg->private_data; 2119 2120 spin_lock_irq(&cm_id_priv->lock); 2121 if (cm_id_priv->id.state != IB_CM_DREQ_SENT && 2122 cm_id_priv->id.state != IB_CM_DREQ_RCVD) { 2123 spin_unlock_irq(&cm_id_priv->lock); 2124 goto out; 2125 } 2126 cm_enter_timewait(cm_id_priv); 2127 2128 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2129 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2130 if (!ret) 2131 list_add_tail(&work->list, &cm_id_priv->work_list); 2132 spin_unlock_irq(&cm_id_priv->lock); 2133 2134 if (ret) 2135 cm_process_work(cm_id_priv, work); 2136 else 2137 cm_deref_id(cm_id_priv); 2138 return 0; 2139 out: 2140 cm_deref_id(cm_id_priv); 2141 return -EINVAL; 2142 } 2143 2144 int ib_send_cm_rej(struct ib_cm_id *cm_id, 2145 enum ib_cm_rej_reason reason, 2146 void *ari, 2147 u8 ari_length, 2148 const void *private_data, 2149 u8 private_data_len) 2150 { 2151 struct cm_id_private *cm_id_priv; 2152 struct ib_mad_send_buf *msg; 2153 unsigned long flags; 2154 int ret; 2155 2156 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) || 2157 (ari && ari_length > IB_CM_REJ_ARI_LENGTH)) 2158 return -EINVAL; 2159 2160 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2161 2162 spin_lock_irqsave(&cm_id_priv->lock, flags); 2163 switch (cm_id->state) { 2164 case IB_CM_REQ_SENT: 2165 case IB_CM_MRA_REQ_RCVD: 2166 case IB_CM_REQ_RCVD: 2167 case IB_CM_MRA_REQ_SENT: 2168 case IB_CM_REP_RCVD: 2169 case IB_CM_MRA_REP_SENT: 2170 ret = cm_alloc_msg(cm_id_priv, &msg); 2171 if (!ret) 2172 cm_format_rej((struct cm_rej_msg *) msg->mad, 2173 cm_id_priv, reason, ari, ari_length, 2174 private_data, private_data_len); 2175 2176 cm_reset_to_idle(cm_id_priv); 2177 break; 2178 case IB_CM_REP_SENT: 2179 case IB_CM_MRA_REP_RCVD: 2180 ret = cm_alloc_msg(cm_id_priv, &msg); 2181 if (!ret) 2182 cm_format_rej((struct cm_rej_msg *) msg->mad, 2183 cm_id_priv, reason, ari, ari_length, 2184 private_data, private_data_len); 2185 2186 cm_enter_timewait(cm_id_priv); 2187 break; 2188 default: 2189 ret = -EINVAL; 2190 goto out; 2191 } 2192 2193 if (ret) 2194 goto out; 2195 2196 ret = ib_post_send_mad(msg, NULL); 2197 if (ret) 2198 cm_free_msg(msg); 2199 2200 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2201 return ret; 2202 } 2203 EXPORT_SYMBOL(ib_send_cm_rej); 2204 2205 static void cm_format_rej_event(struct cm_work *work) 2206 { 2207 struct cm_rej_msg *rej_msg; 2208 struct ib_cm_rej_event_param *param; 2209 2210 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2211 param = &work->cm_event.param.rej_rcvd; 2212 param->ari = rej_msg->ari; 2213 param->ari_length = cm_rej_get_reject_info_len(rej_msg); 2214 param->reason = __be16_to_cpu(rej_msg->reason); 2215 work->cm_event.private_data = &rej_msg->private_data; 2216 } 2217 2218 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 2219 { 2220 struct cm_timewait_info *timewait_info; 2221 struct cm_id_private *cm_id_priv; 2222 __be32 remote_id; 2223 2224 remote_id = rej_msg->local_comm_id; 2225 2226 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) { 2227 spin_lock_irq(&cm.lock); 2228 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari), 2229 remote_id); 2230 if (!timewait_info) { 2231 spin_unlock_irq(&cm.lock); 2232 return NULL; 2233 } 2234 cm_id_priv = idr_find(&cm.local_id_table, (__force int) 2235 (timewait_info->work.local_id ^ 2236 cm.random_id_operand)); 2237 if (cm_id_priv) { 2238 if (cm_id_priv->id.remote_id == remote_id) 2239 atomic_inc(&cm_id_priv->refcount); 2240 else 2241 cm_id_priv = NULL; 2242 } 2243 spin_unlock_irq(&cm.lock); 2244 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ) 2245 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0); 2246 else 2247 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id); 2248 2249 return cm_id_priv; 2250 } 2251 2252 static int cm_rej_handler(struct cm_work *work) 2253 { 2254 struct cm_id_private *cm_id_priv; 2255 struct cm_rej_msg *rej_msg; 2256 int ret; 2257 2258 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad; 2259 cm_id_priv = cm_acquire_rejected_id(rej_msg); 2260 if (!cm_id_priv) 2261 return -EINVAL; 2262 2263 cm_format_rej_event(work); 2264 2265 spin_lock_irq(&cm_id_priv->lock); 2266 switch (cm_id_priv->id.state) { 2267 case IB_CM_REQ_SENT: 2268 case IB_CM_MRA_REQ_RCVD: 2269 case IB_CM_REP_SENT: 2270 case IB_CM_MRA_REP_RCVD: 2271 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2272 /* fall through */ 2273 case IB_CM_REQ_RCVD: 2274 case IB_CM_MRA_REQ_SENT: 2275 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN) 2276 cm_enter_timewait(cm_id_priv); 2277 else 2278 cm_reset_to_idle(cm_id_priv); 2279 break; 2280 case IB_CM_DREQ_SENT: 2281 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2282 /* fall through */ 2283 case IB_CM_REP_RCVD: 2284 case IB_CM_MRA_REP_SENT: 2285 case IB_CM_ESTABLISHED: 2286 cm_enter_timewait(cm_id_priv); 2287 break; 2288 default: 2289 spin_unlock_irq(&cm_id_priv->lock); 2290 ret = -EINVAL; 2291 goto out; 2292 } 2293 2294 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2295 if (!ret) 2296 list_add_tail(&work->list, &cm_id_priv->work_list); 2297 spin_unlock_irq(&cm_id_priv->lock); 2298 2299 if (ret) 2300 cm_process_work(cm_id_priv, work); 2301 else 2302 cm_deref_id(cm_id_priv); 2303 return 0; 2304 out: 2305 cm_deref_id(cm_id_priv); 2306 return -EINVAL; 2307 } 2308 2309 int ib_send_cm_mra(struct ib_cm_id *cm_id, 2310 u8 service_timeout, 2311 const void *private_data, 2312 u8 private_data_len) 2313 { 2314 struct cm_id_private *cm_id_priv; 2315 struct ib_mad_send_buf *msg; 2316 enum ib_cm_state cm_state; 2317 enum ib_cm_lap_state lap_state; 2318 enum cm_msg_response msg_response; 2319 void *data; 2320 unsigned long flags; 2321 int ret; 2322 2323 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE) 2324 return -EINVAL; 2325 2326 data = cm_copy_private_data(private_data, private_data_len); 2327 if (IS_ERR(data)) 2328 return PTR_ERR(data); 2329 2330 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2331 2332 spin_lock_irqsave(&cm_id_priv->lock, flags); 2333 switch(cm_id_priv->id.state) { 2334 case IB_CM_REQ_RCVD: 2335 cm_state = IB_CM_MRA_REQ_SENT; 2336 lap_state = cm_id->lap_state; 2337 msg_response = CM_MSG_RESPONSE_REQ; 2338 break; 2339 case IB_CM_REP_RCVD: 2340 cm_state = IB_CM_MRA_REP_SENT; 2341 lap_state = cm_id->lap_state; 2342 msg_response = CM_MSG_RESPONSE_REP; 2343 break; 2344 case IB_CM_ESTABLISHED: 2345 cm_state = cm_id->state; 2346 lap_state = IB_CM_MRA_LAP_SENT; 2347 msg_response = CM_MSG_RESPONSE_OTHER; 2348 break; 2349 default: 2350 ret = -EINVAL; 2351 goto error1; 2352 } 2353 2354 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) { 2355 ret = cm_alloc_msg(cm_id_priv, &msg); 2356 if (ret) 2357 goto error1; 2358 2359 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2360 msg_response, service_timeout, 2361 private_data, private_data_len); 2362 ret = ib_post_send_mad(msg, NULL); 2363 if (ret) 2364 goto error2; 2365 } 2366 2367 cm_id->state = cm_state; 2368 cm_id->lap_state = lap_state; 2369 cm_id_priv->service_timeout = service_timeout; 2370 cm_set_private_data(cm_id_priv, data, private_data_len); 2371 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2372 return 0; 2373 2374 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2375 kfree(data); 2376 return ret; 2377 2378 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2379 kfree(data); 2380 cm_free_msg(msg); 2381 return ret; 2382 } 2383 EXPORT_SYMBOL(ib_send_cm_mra); 2384 2385 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg) 2386 { 2387 switch (cm_mra_get_msg_mraed(mra_msg)) { 2388 case CM_MSG_RESPONSE_REQ: 2389 return cm_acquire_id(mra_msg->remote_comm_id, 0); 2390 case CM_MSG_RESPONSE_REP: 2391 case CM_MSG_RESPONSE_OTHER: 2392 return cm_acquire_id(mra_msg->remote_comm_id, 2393 mra_msg->local_comm_id); 2394 default: 2395 return NULL; 2396 } 2397 } 2398 2399 static int cm_mra_handler(struct cm_work *work) 2400 { 2401 struct cm_id_private *cm_id_priv; 2402 struct cm_mra_msg *mra_msg; 2403 int timeout, ret; 2404 2405 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad; 2406 cm_id_priv = cm_acquire_mraed_id(mra_msg); 2407 if (!cm_id_priv) 2408 return -EINVAL; 2409 2410 work->cm_event.private_data = &mra_msg->private_data; 2411 work->cm_event.param.mra_rcvd.service_timeout = 2412 cm_mra_get_service_timeout(mra_msg); 2413 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) + 2414 cm_convert_to_ms(cm_id_priv->av.timeout); 2415 2416 spin_lock_irq(&cm_id_priv->lock); 2417 switch (cm_id_priv->id.state) { 2418 case IB_CM_REQ_SENT: 2419 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ || 2420 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2421 cm_id_priv->msg, timeout)) 2422 goto out; 2423 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD; 2424 break; 2425 case IB_CM_REP_SENT: 2426 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP || 2427 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2428 cm_id_priv->msg, timeout)) 2429 goto out; 2430 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD; 2431 break; 2432 case IB_CM_ESTABLISHED: 2433 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER || 2434 cm_id_priv->id.lap_state != IB_CM_LAP_SENT || 2435 ib_modify_mad(cm_id_priv->av.port->mad_agent, 2436 cm_id_priv->msg, timeout)) { 2437 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD) 2438 atomic_long_inc(&work->port-> 2439 counter_group[CM_RECV_DUPLICATES]. 2440 counter[CM_MRA_COUNTER]); 2441 goto out; 2442 } 2443 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD; 2444 break; 2445 case IB_CM_MRA_REQ_RCVD: 2446 case IB_CM_MRA_REP_RCVD: 2447 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2448 counter[CM_MRA_COUNTER]); 2449 /* fall through */ 2450 default: 2451 goto out; 2452 } 2453 2454 cm_id_priv->msg->context[1] = (void *) (unsigned long) 2455 cm_id_priv->id.state; 2456 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2457 if (!ret) 2458 list_add_tail(&work->list, &cm_id_priv->work_list); 2459 spin_unlock_irq(&cm_id_priv->lock); 2460 2461 if (ret) 2462 cm_process_work(cm_id_priv, work); 2463 else 2464 cm_deref_id(cm_id_priv); 2465 return 0; 2466 out: 2467 spin_unlock_irq(&cm_id_priv->lock); 2468 cm_deref_id(cm_id_priv); 2469 return -EINVAL; 2470 } 2471 2472 static void cm_format_lap(struct cm_lap_msg *lap_msg, 2473 struct cm_id_private *cm_id_priv, 2474 struct ib_sa_path_rec *alternate_path, 2475 const void *private_data, 2476 u8 private_data_len) 2477 { 2478 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID, 2479 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP)); 2480 lap_msg->local_comm_id = cm_id_priv->id.local_id; 2481 lap_msg->remote_comm_id = cm_id_priv->id.remote_id; 2482 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn); 2483 /* todo: need remote CM response timeout */ 2484 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F); 2485 lap_msg->alt_local_lid = alternate_path->slid; 2486 lap_msg->alt_remote_lid = alternate_path->dlid; 2487 lap_msg->alt_local_gid = alternate_path->sgid; 2488 lap_msg->alt_remote_gid = alternate_path->dgid; 2489 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label); 2490 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class); 2491 lap_msg->alt_hop_limit = alternate_path->hop_limit; 2492 cm_lap_set_packet_rate(lap_msg, alternate_path->rate); 2493 cm_lap_set_sl(lap_msg, alternate_path->sl); 2494 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */ 2495 cm_lap_set_local_ack_timeout(lap_msg, 2496 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay, 2497 alternate_path->packet_life_time)); 2498 2499 if (private_data && private_data_len) 2500 memcpy(lap_msg->private_data, private_data, private_data_len); 2501 } 2502 2503 int ib_send_cm_lap(struct ib_cm_id *cm_id, 2504 struct ib_sa_path_rec *alternate_path, 2505 const void *private_data, 2506 u8 private_data_len) 2507 { 2508 struct cm_id_private *cm_id_priv; 2509 struct ib_mad_send_buf *msg; 2510 unsigned long flags; 2511 int ret; 2512 2513 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE) 2514 return -EINVAL; 2515 2516 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2517 spin_lock_irqsave(&cm_id_priv->lock, flags); 2518 if (cm_id->state != IB_CM_ESTABLISHED || 2519 (cm_id->lap_state != IB_CM_LAP_UNINIT && 2520 cm_id->lap_state != IB_CM_LAP_IDLE)) { 2521 ret = -EINVAL; 2522 goto out; 2523 } 2524 2525 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av); 2526 if (ret) 2527 goto out; 2528 cm_id_priv->alt_av.timeout = 2529 cm_ack_timeout(cm_id_priv->target_ack_delay, 2530 cm_id_priv->alt_av.timeout - 1); 2531 2532 ret = cm_alloc_msg(cm_id_priv, &msg); 2533 if (ret) 2534 goto out; 2535 2536 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv, 2537 alternate_path, private_data, private_data_len); 2538 msg->timeout_ms = cm_id_priv->timeout_ms; 2539 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED; 2540 2541 ret = ib_post_send_mad(msg, NULL); 2542 if (ret) { 2543 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2544 cm_free_msg(msg); 2545 return ret; 2546 } 2547 2548 cm_id->lap_state = IB_CM_LAP_SENT; 2549 cm_id_priv->msg = msg; 2550 2551 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2552 return ret; 2553 } 2554 EXPORT_SYMBOL(ib_send_cm_lap); 2555 2556 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv, 2557 struct ib_sa_path_rec *path, 2558 struct cm_lap_msg *lap_msg) 2559 { 2560 memset(path, 0, sizeof *path); 2561 path->dgid = lap_msg->alt_local_gid; 2562 path->sgid = lap_msg->alt_remote_gid; 2563 path->dlid = lap_msg->alt_local_lid; 2564 path->slid = lap_msg->alt_remote_lid; 2565 path->flow_label = cm_lap_get_flow_label(lap_msg); 2566 path->hop_limit = lap_msg->alt_hop_limit; 2567 path->traffic_class = cm_lap_get_traffic_class(lap_msg); 2568 path->reversible = 1; 2569 path->pkey = cm_id_priv->pkey; 2570 path->sl = cm_lap_get_sl(lap_msg); 2571 path->mtu_selector = IB_SA_EQ; 2572 path->mtu = cm_id_priv->path_mtu; 2573 path->rate_selector = IB_SA_EQ; 2574 path->rate = cm_lap_get_packet_rate(lap_msg); 2575 path->packet_life_time_selector = IB_SA_EQ; 2576 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg); 2577 path->packet_life_time -= (path->packet_life_time > 0); 2578 } 2579 2580 static int cm_lap_handler(struct cm_work *work) 2581 { 2582 struct cm_id_private *cm_id_priv; 2583 struct cm_lap_msg *lap_msg; 2584 struct ib_cm_lap_event_param *param; 2585 struct ib_mad_send_buf *msg = NULL; 2586 int ret; 2587 2588 /* todo: verify LAP request and send reject APR if invalid. */ 2589 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad; 2590 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id, 2591 lap_msg->local_comm_id); 2592 if (!cm_id_priv) 2593 return -EINVAL; 2594 2595 param = &work->cm_event.param.lap_rcvd; 2596 param->alternate_path = &work->path[0]; 2597 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg); 2598 work->cm_event.private_data = &lap_msg->private_data; 2599 2600 spin_lock_irq(&cm_id_priv->lock); 2601 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) 2602 goto unlock; 2603 2604 switch (cm_id_priv->id.lap_state) { 2605 case IB_CM_LAP_UNINIT: 2606 case IB_CM_LAP_IDLE: 2607 break; 2608 case IB_CM_MRA_LAP_SENT: 2609 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2610 counter[CM_LAP_COUNTER]); 2611 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg)) 2612 goto unlock; 2613 2614 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv, 2615 CM_MSG_RESPONSE_OTHER, 2616 cm_id_priv->service_timeout, 2617 cm_id_priv->private_data, 2618 cm_id_priv->private_data_len); 2619 spin_unlock_irq(&cm_id_priv->lock); 2620 2621 if (ib_post_send_mad(msg, NULL)) 2622 cm_free_msg(msg); 2623 goto deref; 2624 case IB_CM_LAP_RCVD: 2625 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2626 counter[CM_LAP_COUNTER]); 2627 goto unlock; 2628 default: 2629 goto unlock; 2630 } 2631 2632 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD; 2633 cm_id_priv->tid = lap_msg->hdr.tid; 2634 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2635 work->mad_recv_wc->recv_buf.grh, 2636 &cm_id_priv->av); 2637 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av); 2638 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2639 if (!ret) 2640 list_add_tail(&work->list, &cm_id_priv->work_list); 2641 spin_unlock_irq(&cm_id_priv->lock); 2642 2643 if (ret) 2644 cm_process_work(cm_id_priv, work); 2645 else 2646 cm_deref_id(cm_id_priv); 2647 return 0; 2648 2649 unlock: spin_unlock_irq(&cm_id_priv->lock); 2650 deref: cm_deref_id(cm_id_priv); 2651 return -EINVAL; 2652 } 2653 2654 static void cm_format_apr(struct cm_apr_msg *apr_msg, 2655 struct cm_id_private *cm_id_priv, 2656 enum ib_cm_apr_status status, 2657 void *info, 2658 u8 info_length, 2659 const void *private_data, 2660 u8 private_data_len) 2661 { 2662 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid); 2663 apr_msg->local_comm_id = cm_id_priv->id.local_id; 2664 apr_msg->remote_comm_id = cm_id_priv->id.remote_id; 2665 apr_msg->ap_status = (u8) status; 2666 2667 if (info && info_length) { 2668 apr_msg->info_length = info_length; 2669 memcpy(apr_msg->info, info, info_length); 2670 } 2671 2672 if (private_data && private_data_len) 2673 memcpy(apr_msg->private_data, private_data, private_data_len); 2674 } 2675 2676 int ib_send_cm_apr(struct ib_cm_id *cm_id, 2677 enum ib_cm_apr_status status, 2678 void *info, 2679 u8 info_length, 2680 const void *private_data, 2681 u8 private_data_len) 2682 { 2683 struct cm_id_private *cm_id_priv; 2684 struct ib_mad_send_buf *msg; 2685 unsigned long flags; 2686 int ret; 2687 2688 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) || 2689 (info && info_length > IB_CM_APR_INFO_LENGTH)) 2690 return -EINVAL; 2691 2692 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2693 spin_lock_irqsave(&cm_id_priv->lock, flags); 2694 if (cm_id->state != IB_CM_ESTABLISHED || 2695 (cm_id->lap_state != IB_CM_LAP_RCVD && 2696 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) { 2697 ret = -EINVAL; 2698 goto out; 2699 } 2700 2701 ret = cm_alloc_msg(cm_id_priv, &msg); 2702 if (ret) 2703 goto out; 2704 2705 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status, 2706 info, info_length, private_data, private_data_len); 2707 ret = ib_post_send_mad(msg, NULL); 2708 if (ret) { 2709 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2710 cm_free_msg(msg); 2711 return ret; 2712 } 2713 2714 cm_id->lap_state = IB_CM_LAP_IDLE; 2715 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2716 return ret; 2717 } 2718 EXPORT_SYMBOL(ib_send_cm_apr); 2719 2720 static int cm_apr_handler(struct cm_work *work) 2721 { 2722 struct cm_id_private *cm_id_priv; 2723 struct cm_apr_msg *apr_msg; 2724 int ret; 2725 2726 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad; 2727 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id, 2728 apr_msg->local_comm_id); 2729 if (!cm_id_priv) 2730 return -EINVAL; /* Unmatched reply. */ 2731 2732 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status; 2733 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info; 2734 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length; 2735 work->cm_event.private_data = &apr_msg->private_data; 2736 2737 spin_lock_irq(&cm_id_priv->lock); 2738 if (cm_id_priv->id.state != IB_CM_ESTABLISHED || 2739 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT && 2740 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) { 2741 spin_unlock_irq(&cm_id_priv->lock); 2742 goto out; 2743 } 2744 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE; 2745 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 2746 cm_id_priv->msg = NULL; 2747 2748 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2749 if (!ret) 2750 list_add_tail(&work->list, &cm_id_priv->work_list); 2751 spin_unlock_irq(&cm_id_priv->lock); 2752 2753 if (ret) 2754 cm_process_work(cm_id_priv, work); 2755 else 2756 cm_deref_id(cm_id_priv); 2757 return 0; 2758 out: 2759 cm_deref_id(cm_id_priv); 2760 return -EINVAL; 2761 } 2762 2763 static int cm_timewait_handler(struct cm_work *work) 2764 { 2765 struct cm_timewait_info *timewait_info; 2766 struct cm_id_private *cm_id_priv; 2767 int ret; 2768 2769 timewait_info = (struct cm_timewait_info *)work; 2770 spin_lock_irq(&cm.lock); 2771 list_del(&timewait_info->list); 2772 spin_unlock_irq(&cm.lock); 2773 2774 cm_id_priv = cm_acquire_id(timewait_info->work.local_id, 2775 timewait_info->work.remote_id); 2776 if (!cm_id_priv) 2777 return -EINVAL; 2778 2779 spin_lock_irq(&cm_id_priv->lock); 2780 if (cm_id_priv->id.state != IB_CM_TIMEWAIT || 2781 cm_id_priv->remote_qpn != timewait_info->remote_qpn) { 2782 spin_unlock_irq(&cm_id_priv->lock); 2783 goto out; 2784 } 2785 cm_id_priv->id.state = IB_CM_IDLE; 2786 ret = atomic_inc_and_test(&cm_id_priv->work_count); 2787 if (!ret) 2788 list_add_tail(&work->list, &cm_id_priv->work_list); 2789 spin_unlock_irq(&cm_id_priv->lock); 2790 2791 if (ret) 2792 cm_process_work(cm_id_priv, work); 2793 else 2794 cm_deref_id(cm_id_priv); 2795 return 0; 2796 out: 2797 cm_deref_id(cm_id_priv); 2798 return -EINVAL; 2799 } 2800 2801 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg, 2802 struct cm_id_private *cm_id_priv, 2803 struct ib_cm_sidr_req_param *param) 2804 { 2805 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID, 2806 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR)); 2807 sidr_req_msg->request_id = cm_id_priv->id.local_id; 2808 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey); 2809 sidr_req_msg->service_id = param->service_id; 2810 2811 if (param->private_data && param->private_data_len) 2812 memcpy(sidr_req_msg->private_data, param->private_data, 2813 param->private_data_len); 2814 } 2815 2816 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id, 2817 struct ib_cm_sidr_req_param *param) 2818 { 2819 struct cm_id_private *cm_id_priv; 2820 struct ib_mad_send_buf *msg; 2821 unsigned long flags; 2822 int ret; 2823 2824 if (!param->path || (param->private_data && 2825 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE)) 2826 return -EINVAL; 2827 2828 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2829 ret = cm_init_av_by_path(param->path, &cm_id_priv->av); 2830 if (ret) 2831 goto out; 2832 2833 cm_id->service_id = param->service_id; 2834 cm_id->service_mask = __constant_cpu_to_be64(~0ULL); 2835 cm_id_priv->timeout_ms = param->timeout_ms; 2836 cm_id_priv->max_cm_retries = param->max_cm_retries; 2837 ret = cm_alloc_msg(cm_id_priv, &msg); 2838 if (ret) 2839 goto out; 2840 2841 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv, 2842 param); 2843 msg->timeout_ms = cm_id_priv->timeout_ms; 2844 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT; 2845 2846 spin_lock_irqsave(&cm_id_priv->lock, flags); 2847 if (cm_id->state == IB_CM_IDLE) 2848 ret = ib_post_send_mad(msg, NULL); 2849 else 2850 ret = -EINVAL; 2851 2852 if (ret) { 2853 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2854 cm_free_msg(msg); 2855 goto out; 2856 } 2857 cm_id->state = IB_CM_SIDR_REQ_SENT; 2858 cm_id_priv->msg = msg; 2859 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2860 out: 2861 return ret; 2862 } 2863 EXPORT_SYMBOL(ib_send_cm_sidr_req); 2864 2865 static void cm_format_sidr_req_event(struct cm_work *work, 2866 struct ib_cm_id *listen_id) 2867 { 2868 struct cm_sidr_req_msg *sidr_req_msg; 2869 struct ib_cm_sidr_req_event_param *param; 2870 2871 sidr_req_msg = (struct cm_sidr_req_msg *) 2872 work->mad_recv_wc->recv_buf.mad; 2873 param = &work->cm_event.param.sidr_req_rcvd; 2874 param->pkey = __be16_to_cpu(sidr_req_msg->pkey); 2875 param->listen_id = listen_id; 2876 param->port = work->port->port_num; 2877 work->cm_event.private_data = &sidr_req_msg->private_data; 2878 } 2879 2880 static int cm_sidr_req_handler(struct cm_work *work) 2881 { 2882 struct ib_cm_id *cm_id; 2883 struct cm_id_private *cm_id_priv, *cur_cm_id_priv; 2884 struct cm_sidr_req_msg *sidr_req_msg; 2885 struct ib_wc *wc; 2886 2887 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL); 2888 if (IS_ERR(cm_id)) 2889 return PTR_ERR(cm_id); 2890 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2891 2892 /* Record SGID/SLID and request ID for lookup. */ 2893 sidr_req_msg = (struct cm_sidr_req_msg *) 2894 work->mad_recv_wc->recv_buf.mad; 2895 wc = work->mad_recv_wc->wc; 2896 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid); 2897 cm_id_priv->av.dgid.global.interface_id = 0; 2898 cm_init_av_for_response(work->port, work->mad_recv_wc->wc, 2899 work->mad_recv_wc->recv_buf.grh, 2900 &cm_id_priv->av); 2901 cm_id_priv->id.remote_id = sidr_req_msg->request_id; 2902 cm_id_priv->tid = sidr_req_msg->hdr.tid; 2903 atomic_inc(&cm_id_priv->work_count); 2904 2905 spin_lock_irq(&cm.lock); 2906 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv); 2907 if (cur_cm_id_priv) { 2908 spin_unlock_irq(&cm.lock); 2909 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES]. 2910 counter[CM_SIDR_REQ_COUNTER]); 2911 goto out; /* Duplicate message. */ 2912 } 2913 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD; 2914 cur_cm_id_priv = cm_find_listen(cm_id->device, 2915 sidr_req_msg->service_id, 2916 sidr_req_msg->private_data); 2917 if (!cur_cm_id_priv) { 2918 spin_unlock_irq(&cm.lock); 2919 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED); 2920 goto out; /* No match. */ 2921 } 2922 atomic_inc(&cur_cm_id_priv->refcount); 2923 spin_unlock_irq(&cm.lock); 2924 2925 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler; 2926 cm_id_priv->id.context = cur_cm_id_priv->id.context; 2927 cm_id_priv->id.service_id = sidr_req_msg->service_id; 2928 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL); 2929 2930 cm_format_sidr_req_event(work, &cur_cm_id_priv->id); 2931 cm_process_work(cm_id_priv, work); 2932 cm_deref_id(cur_cm_id_priv); 2933 return 0; 2934 out: 2935 ib_destroy_cm_id(&cm_id_priv->id); 2936 return -EINVAL; 2937 } 2938 2939 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg, 2940 struct cm_id_private *cm_id_priv, 2941 struct ib_cm_sidr_rep_param *param) 2942 { 2943 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID, 2944 cm_id_priv->tid); 2945 sidr_rep_msg->request_id = cm_id_priv->id.remote_id; 2946 sidr_rep_msg->status = param->status; 2947 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num)); 2948 sidr_rep_msg->service_id = cm_id_priv->id.service_id; 2949 sidr_rep_msg->qkey = cpu_to_be32(param->qkey); 2950 2951 if (param->info && param->info_length) 2952 memcpy(sidr_rep_msg->info, param->info, param->info_length); 2953 2954 if (param->private_data && param->private_data_len) 2955 memcpy(sidr_rep_msg->private_data, param->private_data, 2956 param->private_data_len); 2957 } 2958 2959 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id, 2960 struct ib_cm_sidr_rep_param *param) 2961 { 2962 struct cm_id_private *cm_id_priv; 2963 struct ib_mad_send_buf *msg; 2964 unsigned long flags; 2965 int ret; 2966 2967 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) || 2968 (param->private_data && 2969 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE)) 2970 return -EINVAL; 2971 2972 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 2973 spin_lock_irqsave(&cm_id_priv->lock, flags); 2974 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) { 2975 ret = -EINVAL; 2976 goto error; 2977 } 2978 2979 ret = cm_alloc_msg(cm_id_priv, &msg); 2980 if (ret) 2981 goto error; 2982 2983 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv, 2984 param); 2985 ret = ib_post_send_mad(msg, NULL); 2986 if (ret) { 2987 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2988 cm_free_msg(msg); 2989 return ret; 2990 } 2991 cm_id->state = IB_CM_IDLE; 2992 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 2993 2994 spin_lock_irqsave(&cm.lock, flags); 2995 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table); 2996 spin_unlock_irqrestore(&cm.lock, flags); 2997 return 0; 2998 2999 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3000 return ret; 3001 } 3002 EXPORT_SYMBOL(ib_send_cm_sidr_rep); 3003 3004 static void cm_format_sidr_rep_event(struct cm_work *work) 3005 { 3006 struct cm_sidr_rep_msg *sidr_rep_msg; 3007 struct ib_cm_sidr_rep_event_param *param; 3008 3009 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3010 work->mad_recv_wc->recv_buf.mad; 3011 param = &work->cm_event.param.sidr_rep_rcvd; 3012 param->status = sidr_rep_msg->status; 3013 param->qkey = be32_to_cpu(sidr_rep_msg->qkey); 3014 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg)); 3015 param->info = &sidr_rep_msg->info; 3016 param->info_len = sidr_rep_msg->info_length; 3017 work->cm_event.private_data = &sidr_rep_msg->private_data; 3018 } 3019 3020 static int cm_sidr_rep_handler(struct cm_work *work) 3021 { 3022 struct cm_sidr_rep_msg *sidr_rep_msg; 3023 struct cm_id_private *cm_id_priv; 3024 3025 sidr_rep_msg = (struct cm_sidr_rep_msg *) 3026 work->mad_recv_wc->recv_buf.mad; 3027 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0); 3028 if (!cm_id_priv) 3029 return -EINVAL; /* Unmatched reply. */ 3030 3031 spin_lock_irq(&cm_id_priv->lock); 3032 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) { 3033 spin_unlock_irq(&cm_id_priv->lock); 3034 goto out; 3035 } 3036 cm_id_priv->id.state = IB_CM_IDLE; 3037 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg); 3038 spin_unlock_irq(&cm_id_priv->lock); 3039 3040 cm_format_sidr_rep_event(work); 3041 cm_process_work(cm_id_priv, work); 3042 return 0; 3043 out: 3044 cm_deref_id(cm_id_priv); 3045 return -EINVAL; 3046 } 3047 3048 static void cm_process_send_error(struct ib_mad_send_buf *msg, 3049 enum ib_wc_status wc_status) 3050 { 3051 struct cm_id_private *cm_id_priv; 3052 struct ib_cm_event cm_event; 3053 enum ib_cm_state state; 3054 int ret; 3055 3056 memset(&cm_event, 0, sizeof cm_event); 3057 cm_id_priv = msg->context[0]; 3058 3059 /* Discard old sends or ones without a response. */ 3060 spin_lock_irq(&cm_id_priv->lock); 3061 state = (enum ib_cm_state) (unsigned long) msg->context[1]; 3062 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state) 3063 goto discard; 3064 3065 switch (state) { 3066 case IB_CM_REQ_SENT: 3067 case IB_CM_MRA_REQ_RCVD: 3068 cm_reset_to_idle(cm_id_priv); 3069 cm_event.event = IB_CM_REQ_ERROR; 3070 break; 3071 case IB_CM_REP_SENT: 3072 case IB_CM_MRA_REP_RCVD: 3073 cm_reset_to_idle(cm_id_priv); 3074 cm_event.event = IB_CM_REP_ERROR; 3075 break; 3076 case IB_CM_DREQ_SENT: 3077 cm_enter_timewait(cm_id_priv); 3078 cm_event.event = IB_CM_DREQ_ERROR; 3079 break; 3080 case IB_CM_SIDR_REQ_SENT: 3081 cm_id_priv->id.state = IB_CM_IDLE; 3082 cm_event.event = IB_CM_SIDR_REQ_ERROR; 3083 break; 3084 default: 3085 goto discard; 3086 } 3087 spin_unlock_irq(&cm_id_priv->lock); 3088 cm_event.param.send_status = wc_status; 3089 3090 /* No other events can occur on the cm_id at this point. */ 3091 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event); 3092 cm_free_msg(msg); 3093 if (ret) 3094 ib_destroy_cm_id(&cm_id_priv->id); 3095 return; 3096 discard: 3097 spin_unlock_irq(&cm_id_priv->lock); 3098 cm_free_msg(msg); 3099 } 3100 3101 static void cm_send_handler(struct ib_mad_agent *mad_agent, 3102 struct ib_mad_send_wc *mad_send_wc) 3103 { 3104 struct ib_mad_send_buf *msg = mad_send_wc->send_buf; 3105 struct cm_port *port; 3106 u16 attr_index; 3107 3108 port = mad_agent->context; 3109 attr_index = be16_to_cpu(((struct ib_mad_hdr *) 3110 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET; 3111 3112 /* 3113 * If the send was in response to a received message (context[0] is not 3114 * set to a cm_id), and is not a REJ, then it is a send that was 3115 * manually retried. 3116 */ 3117 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER)) 3118 msg->retries = 1; 3119 3120 atomic_long_add(1 + msg->retries, 3121 &port->counter_group[CM_XMIT].counter[attr_index]); 3122 if (msg->retries) 3123 atomic_long_add(msg->retries, 3124 &port->counter_group[CM_XMIT_RETRIES]. 3125 counter[attr_index]); 3126 3127 switch (mad_send_wc->status) { 3128 case IB_WC_SUCCESS: 3129 case IB_WC_WR_FLUSH_ERR: 3130 cm_free_msg(msg); 3131 break; 3132 default: 3133 if (msg->context[0] && msg->context[1]) 3134 cm_process_send_error(msg, mad_send_wc->status); 3135 else 3136 cm_free_msg(msg); 3137 break; 3138 } 3139 } 3140 3141 static void cm_work_handler(struct work_struct *_work) 3142 { 3143 struct cm_work *work = container_of(_work, struct cm_work, work.work); 3144 int ret; 3145 3146 switch (work->cm_event.event) { 3147 case IB_CM_REQ_RECEIVED: 3148 ret = cm_req_handler(work); 3149 break; 3150 case IB_CM_MRA_RECEIVED: 3151 ret = cm_mra_handler(work); 3152 break; 3153 case IB_CM_REJ_RECEIVED: 3154 ret = cm_rej_handler(work); 3155 break; 3156 case IB_CM_REP_RECEIVED: 3157 ret = cm_rep_handler(work); 3158 break; 3159 case IB_CM_RTU_RECEIVED: 3160 ret = cm_rtu_handler(work); 3161 break; 3162 case IB_CM_USER_ESTABLISHED: 3163 ret = cm_establish_handler(work); 3164 break; 3165 case IB_CM_DREQ_RECEIVED: 3166 ret = cm_dreq_handler(work); 3167 break; 3168 case IB_CM_DREP_RECEIVED: 3169 ret = cm_drep_handler(work); 3170 break; 3171 case IB_CM_SIDR_REQ_RECEIVED: 3172 ret = cm_sidr_req_handler(work); 3173 break; 3174 case IB_CM_SIDR_REP_RECEIVED: 3175 ret = cm_sidr_rep_handler(work); 3176 break; 3177 case IB_CM_LAP_RECEIVED: 3178 ret = cm_lap_handler(work); 3179 break; 3180 case IB_CM_APR_RECEIVED: 3181 ret = cm_apr_handler(work); 3182 break; 3183 case IB_CM_TIMEWAIT_EXIT: 3184 ret = cm_timewait_handler(work); 3185 break; 3186 default: 3187 ret = -EINVAL; 3188 break; 3189 } 3190 if (ret) 3191 cm_free_work(work); 3192 } 3193 3194 static int cm_establish(struct ib_cm_id *cm_id) 3195 { 3196 struct cm_id_private *cm_id_priv; 3197 struct cm_work *work; 3198 unsigned long flags; 3199 int ret = 0; 3200 3201 work = kmalloc(sizeof *work, GFP_ATOMIC); 3202 if (!work) 3203 return -ENOMEM; 3204 3205 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3206 spin_lock_irqsave(&cm_id_priv->lock, flags); 3207 switch (cm_id->state) 3208 { 3209 case IB_CM_REP_SENT: 3210 case IB_CM_MRA_REP_RCVD: 3211 cm_id->state = IB_CM_ESTABLISHED; 3212 break; 3213 case IB_CM_ESTABLISHED: 3214 ret = -EISCONN; 3215 break; 3216 default: 3217 ret = -EINVAL; 3218 break; 3219 } 3220 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3221 3222 if (ret) { 3223 kfree(work); 3224 goto out; 3225 } 3226 3227 /* 3228 * The CM worker thread may try to destroy the cm_id before it 3229 * can execute this work item. To prevent potential deadlock, 3230 * we need to find the cm_id once we're in the context of the 3231 * worker thread, rather than holding a reference on it. 3232 */ 3233 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3234 work->local_id = cm_id->local_id; 3235 work->remote_id = cm_id->remote_id; 3236 work->mad_recv_wc = NULL; 3237 work->cm_event.event = IB_CM_USER_ESTABLISHED; 3238 queue_delayed_work(cm.wq, &work->work, 0); 3239 out: 3240 return ret; 3241 } 3242 3243 static int cm_migrate(struct ib_cm_id *cm_id) 3244 { 3245 struct cm_id_private *cm_id_priv; 3246 unsigned long flags; 3247 int ret = 0; 3248 3249 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3250 spin_lock_irqsave(&cm_id_priv->lock, flags); 3251 if (cm_id->state == IB_CM_ESTABLISHED && 3252 (cm_id->lap_state == IB_CM_LAP_UNINIT || 3253 cm_id->lap_state == IB_CM_LAP_IDLE)) { 3254 cm_id->lap_state = IB_CM_LAP_IDLE; 3255 cm_id_priv->av = cm_id_priv->alt_av; 3256 } else 3257 ret = -EINVAL; 3258 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3259 3260 return ret; 3261 } 3262 3263 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event) 3264 { 3265 int ret; 3266 3267 switch (event) { 3268 case IB_EVENT_COMM_EST: 3269 ret = cm_establish(cm_id); 3270 break; 3271 case IB_EVENT_PATH_MIG: 3272 ret = cm_migrate(cm_id); 3273 break; 3274 default: 3275 ret = -EINVAL; 3276 } 3277 return ret; 3278 } 3279 EXPORT_SYMBOL(ib_cm_notify); 3280 3281 static void cm_recv_handler(struct ib_mad_agent *mad_agent, 3282 struct ib_mad_recv_wc *mad_recv_wc) 3283 { 3284 struct cm_port *port = mad_agent->context; 3285 struct cm_work *work; 3286 enum ib_cm_event_type event; 3287 u16 attr_id; 3288 int paths = 0; 3289 3290 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) { 3291 case CM_REQ_ATTR_ID: 3292 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)-> 3293 alt_local_lid != 0); 3294 event = IB_CM_REQ_RECEIVED; 3295 break; 3296 case CM_MRA_ATTR_ID: 3297 event = IB_CM_MRA_RECEIVED; 3298 break; 3299 case CM_REJ_ATTR_ID: 3300 event = IB_CM_REJ_RECEIVED; 3301 break; 3302 case CM_REP_ATTR_ID: 3303 event = IB_CM_REP_RECEIVED; 3304 break; 3305 case CM_RTU_ATTR_ID: 3306 event = IB_CM_RTU_RECEIVED; 3307 break; 3308 case CM_DREQ_ATTR_ID: 3309 event = IB_CM_DREQ_RECEIVED; 3310 break; 3311 case CM_DREP_ATTR_ID: 3312 event = IB_CM_DREP_RECEIVED; 3313 break; 3314 case CM_SIDR_REQ_ATTR_ID: 3315 event = IB_CM_SIDR_REQ_RECEIVED; 3316 break; 3317 case CM_SIDR_REP_ATTR_ID: 3318 event = IB_CM_SIDR_REP_RECEIVED; 3319 break; 3320 case CM_LAP_ATTR_ID: 3321 paths = 1; 3322 event = IB_CM_LAP_RECEIVED; 3323 break; 3324 case CM_APR_ATTR_ID: 3325 event = IB_CM_APR_RECEIVED; 3326 break; 3327 default: 3328 ib_free_recv_mad(mad_recv_wc); 3329 return; 3330 } 3331 3332 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id); 3333 atomic_long_inc(&port->counter_group[CM_RECV]. 3334 counter[attr_id - CM_ATTR_ID_OFFSET]); 3335 3336 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths, 3337 GFP_KERNEL); 3338 if (!work) { 3339 ib_free_recv_mad(mad_recv_wc); 3340 return; 3341 } 3342 3343 INIT_DELAYED_WORK(&work->work, cm_work_handler); 3344 work->cm_event.event = event; 3345 work->mad_recv_wc = mad_recv_wc; 3346 work->port = port; 3347 queue_delayed_work(cm.wq, &work->work, 0); 3348 } 3349 3350 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv, 3351 struct ib_qp_attr *qp_attr, 3352 int *qp_attr_mask) 3353 { 3354 unsigned long flags; 3355 int ret; 3356 3357 spin_lock_irqsave(&cm_id_priv->lock, flags); 3358 switch (cm_id_priv->id.state) { 3359 case IB_CM_REQ_SENT: 3360 case IB_CM_MRA_REQ_RCVD: 3361 case IB_CM_REQ_RCVD: 3362 case IB_CM_MRA_REQ_SENT: 3363 case IB_CM_REP_RCVD: 3364 case IB_CM_MRA_REP_SENT: 3365 case IB_CM_REP_SENT: 3366 case IB_CM_MRA_REP_RCVD: 3367 case IB_CM_ESTABLISHED: 3368 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | 3369 IB_QP_PKEY_INDEX | IB_QP_PORT; 3370 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE; 3371 if (cm_id_priv->responder_resources) 3372 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ | 3373 IB_ACCESS_REMOTE_ATOMIC; 3374 qp_attr->pkey_index = cm_id_priv->av.pkey_index; 3375 qp_attr->port_num = cm_id_priv->av.port->port_num; 3376 ret = 0; 3377 break; 3378 default: 3379 ret = -EINVAL; 3380 break; 3381 } 3382 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3383 return ret; 3384 } 3385 3386 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv, 3387 struct ib_qp_attr *qp_attr, 3388 int *qp_attr_mask) 3389 { 3390 unsigned long flags; 3391 int ret; 3392 3393 spin_lock_irqsave(&cm_id_priv->lock, flags); 3394 switch (cm_id_priv->id.state) { 3395 case IB_CM_REQ_RCVD: 3396 case IB_CM_MRA_REQ_SENT: 3397 case IB_CM_REP_RCVD: 3398 case IB_CM_MRA_REP_SENT: 3399 case IB_CM_REP_SENT: 3400 case IB_CM_MRA_REP_RCVD: 3401 case IB_CM_ESTABLISHED: 3402 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | 3403 IB_QP_DEST_QPN | IB_QP_RQ_PSN; 3404 qp_attr->ah_attr = cm_id_priv->av.ah_attr; 3405 qp_attr->path_mtu = cm_id_priv->path_mtu; 3406 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn); 3407 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn); 3408 if (cm_id_priv->qp_type == IB_QPT_RC) { 3409 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC | 3410 IB_QP_MIN_RNR_TIMER; 3411 qp_attr->max_dest_rd_atomic = 3412 cm_id_priv->responder_resources; 3413 qp_attr->min_rnr_timer = 0; 3414 } 3415 if (cm_id_priv->alt_av.ah_attr.dlid) { 3416 *qp_attr_mask |= IB_QP_ALT_PATH; 3417 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3418 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3419 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3420 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3421 } 3422 ret = 0; 3423 break; 3424 default: 3425 ret = -EINVAL; 3426 break; 3427 } 3428 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3429 return ret; 3430 } 3431 3432 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv, 3433 struct ib_qp_attr *qp_attr, 3434 int *qp_attr_mask) 3435 { 3436 unsigned long flags; 3437 int ret; 3438 3439 spin_lock_irqsave(&cm_id_priv->lock, flags); 3440 switch (cm_id_priv->id.state) { 3441 /* Allow transition to RTS before sending REP */ 3442 case IB_CM_REQ_RCVD: 3443 case IB_CM_MRA_REQ_SENT: 3444 3445 case IB_CM_REP_RCVD: 3446 case IB_CM_MRA_REP_SENT: 3447 case IB_CM_REP_SENT: 3448 case IB_CM_MRA_REP_RCVD: 3449 case IB_CM_ESTABLISHED: 3450 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) { 3451 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN; 3452 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn); 3453 if (cm_id_priv->qp_type == IB_QPT_RC) { 3454 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 3455 IB_QP_RNR_RETRY | 3456 IB_QP_MAX_QP_RD_ATOMIC; 3457 qp_attr->timeout = cm_id_priv->av.timeout; 3458 qp_attr->retry_cnt = cm_id_priv->retry_count; 3459 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count; 3460 qp_attr->max_rd_atomic = 3461 cm_id_priv->initiator_depth; 3462 } 3463 if (cm_id_priv->alt_av.ah_attr.dlid) { 3464 *qp_attr_mask |= IB_QP_PATH_MIG_STATE; 3465 qp_attr->path_mig_state = IB_MIG_REARM; 3466 } 3467 } else { 3468 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE; 3469 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num; 3470 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index; 3471 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout; 3472 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr; 3473 qp_attr->path_mig_state = IB_MIG_REARM; 3474 } 3475 ret = 0; 3476 break; 3477 default: 3478 ret = -EINVAL; 3479 break; 3480 } 3481 spin_unlock_irqrestore(&cm_id_priv->lock, flags); 3482 return ret; 3483 } 3484 3485 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id, 3486 struct ib_qp_attr *qp_attr, 3487 int *qp_attr_mask) 3488 { 3489 struct cm_id_private *cm_id_priv; 3490 int ret; 3491 3492 cm_id_priv = container_of(cm_id, struct cm_id_private, id); 3493 switch (qp_attr->qp_state) { 3494 case IB_QPS_INIT: 3495 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask); 3496 break; 3497 case IB_QPS_RTR: 3498 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask); 3499 break; 3500 case IB_QPS_RTS: 3501 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask); 3502 break; 3503 default: 3504 ret = -EINVAL; 3505 break; 3506 } 3507 return ret; 3508 } 3509 EXPORT_SYMBOL(ib_cm_init_qp_attr); 3510 3511 static void cm_get_ack_delay(struct cm_device *cm_dev) 3512 { 3513 struct ib_device_attr attr; 3514 3515 if (ib_query_device(cm_dev->device, &attr)) 3516 cm_dev->ack_delay = 0; /* acks will rely on packet life time */ 3517 else 3518 cm_dev->ack_delay = attr.local_ca_ack_delay; 3519 } 3520 3521 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr, 3522 char *buf) 3523 { 3524 struct cm_counter_group *group; 3525 struct cm_counter_attribute *cm_attr; 3526 3527 group = container_of(obj, struct cm_counter_group, obj); 3528 cm_attr = container_of(attr, struct cm_counter_attribute, attr); 3529 3530 return sprintf(buf, "%ld\n", 3531 atomic_long_read(&group->counter[cm_attr->index])); 3532 } 3533 3534 static struct sysfs_ops cm_counter_ops = { 3535 .show = cm_show_counter 3536 }; 3537 3538 static struct kobj_type cm_counter_obj_type = { 3539 .sysfs_ops = &cm_counter_ops, 3540 .default_attrs = cm_counter_default_attrs 3541 }; 3542 3543 static void cm_release_port_obj(struct kobject *obj) 3544 { 3545 struct cm_port *cm_port; 3546 3547 printk(KERN_ERR "free cm port\n"); 3548 3549 cm_port = container_of(obj, struct cm_port, port_obj); 3550 kfree(cm_port); 3551 } 3552 3553 static struct kobj_type cm_port_obj_type = { 3554 .release = cm_release_port_obj 3555 }; 3556 3557 static void cm_release_dev_obj(struct kobject *obj) 3558 { 3559 struct cm_device *cm_dev; 3560 3561 printk(KERN_ERR "free cm dev\n"); 3562 3563 cm_dev = container_of(obj, struct cm_device, dev_obj); 3564 kfree(cm_dev); 3565 } 3566 3567 static struct kobj_type cm_dev_obj_type = { 3568 .release = cm_release_dev_obj 3569 }; 3570 3571 struct class cm_class = { 3572 .name = "infiniband_cm", 3573 }; 3574 EXPORT_SYMBOL(cm_class); 3575 3576 static void cm_remove_fs_obj(struct kobject *obj) 3577 { 3578 kobject_put(obj->parent); 3579 kobject_put(obj); 3580 } 3581 3582 static int cm_create_port_fs(struct cm_port *port) 3583 { 3584 int i, ret; 3585 3586 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type, 3587 kobject_get(&port->cm_dev->dev_obj), 3588 "%d", port->port_num); 3589 if (ret) { 3590 kfree(port); 3591 return ret; 3592 } 3593 3594 for (i = 0; i < CM_COUNTER_GROUPS; i++) { 3595 ret = kobject_init_and_add(&port->counter_group[i].obj, 3596 &cm_counter_obj_type, 3597 kobject_get(&port->port_obj), 3598 "%s", counter_group_names[i]); 3599 if (ret) 3600 goto error; 3601 } 3602 3603 return 0; 3604 3605 error: 3606 while (i--) 3607 cm_remove_fs_obj(&port->counter_group[i].obj); 3608 cm_remove_fs_obj(&port->port_obj); 3609 return ret; 3610 3611 } 3612 3613 static void cm_remove_port_fs(struct cm_port *port) 3614 { 3615 int i; 3616 3617 for (i = 0; i < CM_COUNTER_GROUPS; i++) 3618 cm_remove_fs_obj(&port->counter_group[i].obj); 3619 3620 cm_remove_fs_obj(&port->port_obj); 3621 } 3622 3623 static void cm_add_one(struct ib_device *device) 3624 { 3625 struct cm_device *cm_dev; 3626 struct cm_port *port; 3627 struct ib_mad_reg_req reg_req = { 3628 .mgmt_class = IB_MGMT_CLASS_CM, 3629 .mgmt_class_version = IB_CM_CLASS_VERSION 3630 }; 3631 struct ib_port_modify port_modify = { 3632 .set_port_cap_mask = IB_PORT_CM_SUP 3633 }; 3634 unsigned long flags; 3635 int ret; 3636 u8 i; 3637 3638 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB) 3639 return; 3640 3641 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) * 3642 device->phys_port_cnt, GFP_KERNEL); 3643 if (!cm_dev) 3644 return; 3645 3646 cm_dev->device = device; 3647 cm_get_ack_delay(cm_dev); 3648 3649 ret = kobject_init_and_add(&cm_dev->dev_obj, &cm_dev_obj_type, 3650 &cm_class.subsys.kobj, "%s", device->name); 3651 if (ret) { 3652 kfree(cm_dev); 3653 return; 3654 } 3655 3656 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask); 3657 for (i = 1; i <= device->phys_port_cnt; i++) { 3658 port = kzalloc(sizeof *port, GFP_KERNEL); 3659 if (!port) 3660 goto error1; 3661 3662 cm_dev->port[i-1] = port; 3663 port->cm_dev = cm_dev; 3664 port->port_num = i; 3665 3666 ret = cm_create_port_fs(port); 3667 if (ret) 3668 goto error1; 3669 3670 port->mad_agent = ib_register_mad_agent(device, i, 3671 IB_QPT_GSI, 3672 ®_req, 3673 0, 3674 cm_send_handler, 3675 cm_recv_handler, 3676 port); 3677 if (IS_ERR(port->mad_agent)) 3678 goto error2; 3679 3680 ret = ib_modify_port(device, i, 0, &port_modify); 3681 if (ret) 3682 goto error3; 3683 } 3684 ib_set_client_data(device, &cm_client, cm_dev); 3685 3686 write_lock_irqsave(&cm.device_lock, flags); 3687 list_add_tail(&cm_dev->list, &cm.device_list); 3688 write_unlock_irqrestore(&cm.device_lock, flags); 3689 return; 3690 3691 error3: 3692 ib_unregister_mad_agent(port->mad_agent); 3693 error2: 3694 cm_remove_port_fs(port); 3695 error1: 3696 port_modify.set_port_cap_mask = 0; 3697 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP; 3698 while (--i) { 3699 port = cm_dev->port[i-1]; 3700 ib_modify_port(device, port->port_num, 0, &port_modify); 3701 ib_unregister_mad_agent(port->mad_agent); 3702 cm_remove_port_fs(port); 3703 } 3704 cm_remove_fs_obj(&cm_dev->dev_obj); 3705 } 3706 3707 static void cm_remove_one(struct ib_device *device) 3708 { 3709 struct cm_device *cm_dev; 3710 struct cm_port *port; 3711 struct ib_port_modify port_modify = { 3712 .clr_port_cap_mask = IB_PORT_CM_SUP 3713 }; 3714 unsigned long flags; 3715 int i; 3716 3717 cm_dev = ib_get_client_data(device, &cm_client); 3718 if (!cm_dev) 3719 return; 3720 3721 write_lock_irqsave(&cm.device_lock, flags); 3722 list_del(&cm_dev->list); 3723 write_unlock_irqrestore(&cm.device_lock, flags); 3724 3725 for (i = 1; i <= device->phys_port_cnt; i++) { 3726 port = cm_dev->port[i-1]; 3727 ib_modify_port(device, port->port_num, 0, &port_modify); 3728 ib_unregister_mad_agent(port->mad_agent); 3729 cm_remove_port_fs(port); 3730 } 3731 cm_remove_fs_obj(&cm_dev->dev_obj); 3732 } 3733 3734 static int __init ib_cm_init(void) 3735 { 3736 int ret; 3737 3738 memset(&cm, 0, sizeof cm); 3739 INIT_LIST_HEAD(&cm.device_list); 3740 rwlock_init(&cm.device_lock); 3741 spin_lock_init(&cm.lock); 3742 cm.listen_service_table = RB_ROOT; 3743 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID); 3744 cm.remote_id_table = RB_ROOT; 3745 cm.remote_qp_table = RB_ROOT; 3746 cm.remote_sidr_table = RB_ROOT; 3747 idr_init(&cm.local_id_table); 3748 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand); 3749 idr_pre_get(&cm.local_id_table, GFP_KERNEL); 3750 INIT_LIST_HEAD(&cm.timewait_list); 3751 3752 ret = class_register(&cm_class); 3753 if (ret) 3754 return -ENOMEM; 3755 3756 cm.wq = create_workqueue("ib_cm"); 3757 if (!cm.wq) { 3758 ret = -ENOMEM; 3759 goto error1; 3760 } 3761 3762 ret = ib_register_client(&cm_client); 3763 if (ret) 3764 goto error2; 3765 3766 return 0; 3767 error2: 3768 destroy_workqueue(cm.wq); 3769 error1: 3770 class_unregister(&cm_class); 3771 return ret; 3772 } 3773 3774 static void __exit ib_cm_cleanup(void) 3775 { 3776 struct cm_timewait_info *timewait_info, *tmp; 3777 3778 spin_lock_irq(&cm.lock); 3779 list_for_each_entry(timewait_info, &cm.timewait_list, list) 3780 cancel_delayed_work(&timewait_info->work.work); 3781 spin_unlock_irq(&cm.lock); 3782 3783 destroy_workqueue(cm.wq); 3784 3785 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) { 3786 list_del(&timewait_info->list); 3787 kfree(timewait_info); 3788 } 3789 3790 ib_unregister_client(&cm_client); 3791 class_unregister(&cm_class); 3792 idr_destroy(&cm.local_id_table); 3793 } 3794 3795 module_init(ib_cm_init); 3796 module_exit(ib_cm_cleanup); 3797 3798