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sys/ofed/drivers/infiniband/core/ib_mad_rmpp.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0 3 * 4 * Copyright (c) 2005 Intel Inc. All rights reserved. 5 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved. 6 * Copyright (c) 2014 Intel Corporation. All rights reserved. 7 * 8 * This software is available to you under a choice of one of two 9 * licenses. You may choose to be licensed under the terms of the GNU 10 * General Public License (GPL) Version 2, available from the file 11 * COPYING in the main directory of this source tree, or the 12 * OpenIB.org BSD license below: 13 * 14 * Redistribution and use in source and binary forms, with or 15 * without modification, are permitted provided that the following 16 * conditions are met: 17 * 18 * - Redistributions of source code must retain the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer. 21 * 22 * - Redistributions in binary form must reproduce the above 23 * copyright notice, this list of conditions and the following 24 * disclaimer in the documentation and/or other materials 25 * provided with the distribution. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 34 * SOFTWARE. 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <linux/slab.h> 41 42 #include "mad_priv.h" 43 #include "mad_rmpp.h" 44 45 enum rmpp_state { 46 RMPP_STATE_ACTIVE, 47 RMPP_STATE_TIMEOUT, 48 RMPP_STATE_COMPLETE, 49 RMPP_STATE_CANCELING 50 }; 51 52 struct mad_rmpp_recv { 53 struct ib_mad_agent_private *agent; 54 struct list_head list; 55 struct delayed_work timeout_work; 56 struct delayed_work cleanup_work; 57 struct completion comp; 58 enum rmpp_state state; 59 spinlock_t lock; 60 atomic_t refcount; 61 62 struct ib_ah *ah; 63 struct ib_mad_recv_wc *rmpp_wc; 64 struct ib_mad_recv_buf *cur_seg_buf; 65 int last_ack; 66 int seg_num; 67 int newwin; 68 int repwin; 69 70 __be64 tid; 71 u32 src_qp; 72 u16 slid; 73 u8 mgmt_class; 74 u8 class_version; 75 u8 method; 76 u8 base_version; 77 }; 78 79 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 80 { 81 if (atomic_dec_and_test(&rmpp_recv->refcount)) 82 complete(&rmpp_recv->comp); 83 } 84 85 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv) 86 { 87 deref_rmpp_recv(rmpp_recv); 88 wait_for_completion(&rmpp_recv->comp); 89 ib_destroy_ah(rmpp_recv->ah, RDMA_DESTROY_AH_SLEEPABLE); 90 kfree(rmpp_recv); 91 } 92 93 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent) 94 { 95 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv; 96 unsigned long flags; 97 98 spin_lock_irqsave(&agent->lock, flags); 99 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 100 if (rmpp_recv->state != RMPP_STATE_COMPLETE) 101 ib_free_recv_mad(rmpp_recv->rmpp_wc); 102 rmpp_recv->state = RMPP_STATE_CANCELING; 103 } 104 spin_unlock_irqrestore(&agent->lock, flags); 105 106 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 107 cancel_delayed_work_sync(&rmpp_recv->timeout_work); 108 cancel_delayed_work_sync(&rmpp_recv->cleanup_work); 109 } 110 111 flush_workqueue(agent->qp_info->port_priv->wq); 112 113 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv, 114 &agent->rmpp_list, list) { 115 list_del(&rmpp_recv->list); 116 destroy_rmpp_recv(rmpp_recv); 117 } 118 } 119 120 static void format_ack(struct ib_mad_send_buf *msg, 121 struct ib_rmpp_mad *data, 122 struct mad_rmpp_recv *rmpp_recv) 123 { 124 struct ib_rmpp_mad *ack = msg->mad; 125 unsigned long flags; 126 127 memcpy(ack, &data->mad_hdr, msg->hdr_len); 128 129 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 130 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK; 131 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 132 133 spin_lock_irqsave(&rmpp_recv->lock, flags); 134 rmpp_recv->last_ack = rmpp_recv->seg_num; 135 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num); 136 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin); 137 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 138 } 139 140 static void ack_recv(struct mad_rmpp_recv *rmpp_recv, 141 struct ib_mad_recv_wc *recv_wc) 142 { 143 struct ib_mad_send_buf *msg; 144 int ret, hdr_len; 145 146 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); 147 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp, 148 recv_wc->wc->pkey_index, 1, hdr_len, 149 0, GFP_KERNEL, 150 IB_MGMT_BASE_VERSION); 151 if (IS_ERR(msg)) 152 return; 153 154 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv); 155 msg->ah = rmpp_recv->ah; 156 ret = ib_post_send_mad(msg, NULL); 157 if (ret) 158 ib_free_send_mad(msg); 159 } 160 161 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent, 162 struct ib_mad_recv_wc *recv_wc) 163 { 164 struct ib_mad_send_buf *msg; 165 struct ib_ah *ah; 166 int hdr_len; 167 168 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc, 169 recv_wc->recv_buf.grh, agent->port_num); 170 if (IS_ERR(ah)) 171 return (void *) ah; 172 173 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class); 174 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp, 175 recv_wc->wc->pkey_index, 1, 176 hdr_len, 0, GFP_KERNEL, 177 IB_MGMT_BASE_VERSION); 178 if (IS_ERR(msg)) 179 ib_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE); 180 else { 181 msg->ah = ah; 182 msg->context[0] = ah; 183 } 184 185 return msg; 186 } 187 188 static void ack_ds_ack(struct ib_mad_agent_private *agent, 189 struct ib_mad_recv_wc *recv_wc) 190 { 191 struct ib_mad_send_buf *msg; 192 struct ib_rmpp_mad *rmpp_mad; 193 int ret; 194 195 msg = alloc_response_msg(&agent->agent, recv_wc); 196 if (IS_ERR(msg)) 197 return; 198 199 rmpp_mad = msg->mad; 200 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); 201 202 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 203 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 204 rmpp_mad->rmpp_hdr.seg_num = 0; 205 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1); 206 207 ret = ib_post_send_mad(msg, NULL); 208 if (ret) { 209 ib_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE); 210 ib_free_send_mad(msg); 211 } 212 } 213 214 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc) 215 { 216 if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah) 217 ib_destroy_ah(mad_send_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE); 218 ib_free_send_mad(mad_send_wc->send_buf); 219 } 220 221 static void nack_recv(struct ib_mad_agent_private *agent, 222 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status) 223 { 224 struct ib_mad_send_buf *msg; 225 struct ib_rmpp_mad *rmpp_mad; 226 int ret; 227 228 msg = alloc_response_msg(&agent->agent, recv_wc); 229 if (IS_ERR(msg)) 230 return; 231 232 rmpp_mad = msg->mad; 233 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len); 234 235 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP; 236 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION; 237 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT; 238 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 239 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status; 240 rmpp_mad->rmpp_hdr.seg_num = 0; 241 rmpp_mad->rmpp_hdr.paylen_newwin = 0; 242 243 ret = ib_post_send_mad(msg, NULL); 244 if (ret) { 245 ib_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE); 246 ib_free_send_mad(msg); 247 } 248 } 249 250 static void recv_timeout_handler(struct work_struct *work) 251 { 252 struct mad_rmpp_recv *rmpp_recv = 253 container_of(work, struct mad_rmpp_recv, timeout_work.work); 254 struct ib_mad_recv_wc *rmpp_wc; 255 unsigned long flags; 256 257 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 258 if (rmpp_recv->state != RMPP_STATE_ACTIVE) { 259 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 260 return; 261 } 262 rmpp_recv->state = RMPP_STATE_TIMEOUT; 263 list_del(&rmpp_recv->list); 264 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 265 266 rmpp_wc = rmpp_recv->rmpp_wc; 267 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L); 268 destroy_rmpp_recv(rmpp_recv); 269 ib_free_recv_mad(rmpp_wc); 270 } 271 272 static void recv_cleanup_handler(struct work_struct *work) 273 { 274 struct mad_rmpp_recv *rmpp_recv = 275 container_of(work, struct mad_rmpp_recv, cleanup_work.work); 276 unsigned long flags; 277 278 spin_lock_irqsave(&rmpp_recv->agent->lock, flags); 279 if (rmpp_recv->state == RMPP_STATE_CANCELING) { 280 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 281 return; 282 } 283 list_del(&rmpp_recv->list); 284 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags); 285 destroy_rmpp_recv(rmpp_recv); 286 } 287 288 static struct mad_rmpp_recv * 289 create_rmpp_recv(struct ib_mad_agent_private *agent, 290 struct ib_mad_recv_wc *mad_recv_wc) 291 { 292 struct mad_rmpp_recv *rmpp_recv; 293 struct ib_mad_hdr *mad_hdr; 294 295 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL); 296 if (!rmpp_recv) 297 return NULL; 298 299 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd, 300 mad_recv_wc->wc, 301 mad_recv_wc->recv_buf.grh, 302 agent->agent.port_num); 303 if (IS_ERR(rmpp_recv->ah)) 304 goto error; 305 306 rmpp_recv->agent = agent; 307 init_completion(&rmpp_recv->comp); 308 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler); 309 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler); 310 spin_lock_init(&rmpp_recv->lock); 311 rmpp_recv->state = RMPP_STATE_ACTIVE; 312 atomic_set(&rmpp_recv->refcount, 1); 313 314 rmpp_recv->rmpp_wc = mad_recv_wc; 315 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf; 316 rmpp_recv->newwin = 1; 317 rmpp_recv->seg_num = 1; 318 rmpp_recv->last_ack = 0; 319 rmpp_recv->repwin = 1; 320 321 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 322 rmpp_recv->tid = mad_hdr->tid; 323 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp; 324 rmpp_recv->slid = mad_recv_wc->wc->slid; 325 rmpp_recv->mgmt_class = mad_hdr->mgmt_class; 326 rmpp_recv->class_version = mad_hdr->class_version; 327 rmpp_recv->method = mad_hdr->method; 328 rmpp_recv->base_version = mad_hdr->base_version; 329 return rmpp_recv; 330 331 error: kfree(rmpp_recv); 332 return NULL; 333 } 334 335 static struct mad_rmpp_recv * 336 find_rmpp_recv(struct ib_mad_agent_private *agent, 337 struct ib_mad_recv_wc *mad_recv_wc) 338 { 339 struct mad_rmpp_recv *rmpp_recv; 340 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr; 341 342 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 343 if (rmpp_recv->tid == mad_hdr->tid && 344 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp && 345 rmpp_recv->slid == mad_recv_wc->wc->slid && 346 rmpp_recv->mgmt_class == mad_hdr->mgmt_class && 347 rmpp_recv->class_version == mad_hdr->class_version && 348 rmpp_recv->method == mad_hdr->method) 349 return rmpp_recv; 350 } 351 return NULL; 352 } 353 354 static struct mad_rmpp_recv * 355 acquire_rmpp_recv(struct ib_mad_agent_private *agent, 356 struct ib_mad_recv_wc *mad_recv_wc) 357 { 358 struct mad_rmpp_recv *rmpp_recv; 359 unsigned long flags; 360 361 spin_lock_irqsave(&agent->lock, flags); 362 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); 363 if (rmpp_recv) 364 atomic_inc(&rmpp_recv->refcount); 365 spin_unlock_irqrestore(&agent->lock, flags); 366 return rmpp_recv; 367 } 368 369 static struct mad_rmpp_recv * 370 insert_rmpp_recv(struct ib_mad_agent_private *agent, 371 struct mad_rmpp_recv *rmpp_recv) 372 { 373 struct mad_rmpp_recv *cur_rmpp_recv; 374 375 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc); 376 if (!cur_rmpp_recv) 377 list_add_tail(&rmpp_recv->list, &agent->rmpp_list); 378 379 return cur_rmpp_recv; 380 } 381 382 static inline int get_last_flag(struct ib_mad_recv_buf *seg) 383 { 384 struct ib_rmpp_mad *rmpp_mad; 385 386 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 387 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST; 388 } 389 390 static inline int get_seg_num(struct ib_mad_recv_buf *seg) 391 { 392 struct ib_rmpp_mad *rmpp_mad; 393 394 rmpp_mad = (struct ib_rmpp_mad *) seg->mad; 395 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 396 } 397 398 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list, 399 struct ib_mad_recv_buf *seg) 400 { 401 if (seg->list.next == rmpp_list) 402 return NULL; 403 404 return container_of(seg->list.next, struct ib_mad_recv_buf, list); 405 } 406 407 static inline int window_size(struct ib_mad_agent_private *agent) 408 { 409 return max(agent->qp_info->recv_queue.max_active >> 3, 1); 410 } 411 412 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list, 413 int seg_num) 414 { 415 struct ib_mad_recv_buf *seg_buf; 416 int cur_seg_num; 417 418 list_for_each_entry_reverse(seg_buf, rmpp_list, list) { 419 cur_seg_num = get_seg_num(seg_buf); 420 if (seg_num > cur_seg_num) 421 return seg_buf; 422 if (seg_num == cur_seg_num) 423 break; 424 } 425 return NULL; 426 } 427 428 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv, 429 struct ib_mad_recv_buf *new_buf) 430 { 431 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list; 432 433 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) { 434 rmpp_recv->cur_seg_buf = new_buf; 435 rmpp_recv->seg_num++; 436 new_buf = get_next_seg(rmpp_list, new_buf); 437 } 438 } 439 440 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv) 441 { 442 struct ib_rmpp_mad *rmpp_mad; 443 int hdr_size, data_size, pad; 444 bool opa = rdma_cap_opa_mad(rmpp_recv->agent->qp_info->port_priv->device, 445 rmpp_recv->agent->qp_info->port_priv->port_num); 446 447 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad; 448 449 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class); 450 if (opa && rmpp_recv->base_version == OPA_MGMT_BASE_VERSION) { 451 data_size = sizeof(struct opa_rmpp_mad) - hdr_size; 452 pad = OPA_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 453 if (pad > OPA_MGMT_RMPP_DATA || pad < 0) 454 pad = 0; 455 } else { 456 data_size = sizeof(struct ib_rmpp_mad) - hdr_size; 457 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 458 if (pad > IB_MGMT_RMPP_DATA || pad < 0) 459 pad = 0; 460 } 461 462 return hdr_size + rmpp_recv->seg_num * data_size - pad; 463 } 464 465 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv) 466 { 467 struct ib_mad_recv_wc *rmpp_wc; 468 469 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc); 470 if (rmpp_recv->seg_num > 1) 471 cancel_delayed_work(&rmpp_recv->timeout_work); 472 473 rmpp_wc = rmpp_recv->rmpp_wc; 474 rmpp_wc->mad_len = get_mad_len(rmpp_recv); 475 /* 10 seconds until we can find the packet lifetime */ 476 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq, 477 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000)); 478 return rmpp_wc; 479 } 480 481 static struct ib_mad_recv_wc * 482 continue_rmpp(struct ib_mad_agent_private *agent, 483 struct ib_mad_recv_wc *mad_recv_wc) 484 { 485 struct mad_rmpp_recv *rmpp_recv; 486 struct ib_mad_recv_buf *prev_buf; 487 struct ib_mad_recv_wc *done_wc; 488 int seg_num; 489 unsigned long flags; 490 491 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc); 492 if (!rmpp_recv) 493 goto drop1; 494 495 seg_num = get_seg_num(&mad_recv_wc->recv_buf); 496 497 spin_lock_irqsave(&rmpp_recv->lock, flags); 498 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) || 499 (seg_num > rmpp_recv->newwin)) 500 goto drop3; 501 502 if ((seg_num <= rmpp_recv->last_ack) || 503 (rmpp_recv->state == RMPP_STATE_COMPLETE)) { 504 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 505 ack_recv(rmpp_recv, mad_recv_wc); 506 goto drop2; 507 } 508 509 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num); 510 if (!prev_buf) 511 goto drop3; 512 513 done_wc = NULL; 514 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list); 515 if (rmpp_recv->cur_seg_buf == prev_buf) { 516 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf); 517 if (get_last_flag(rmpp_recv->cur_seg_buf)) { 518 rmpp_recv->state = RMPP_STATE_COMPLETE; 519 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 520 done_wc = complete_rmpp(rmpp_recv); 521 goto out; 522 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) { 523 rmpp_recv->newwin += window_size(agent); 524 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 525 ack_recv(rmpp_recv, mad_recv_wc); 526 goto out; 527 } 528 } 529 spin_unlock_irqrestore(&rmpp_recv->lock, flags); 530 out: 531 deref_rmpp_recv(rmpp_recv); 532 return done_wc; 533 534 drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags); 535 drop2: deref_rmpp_recv(rmpp_recv); 536 drop1: ib_free_recv_mad(mad_recv_wc); 537 return NULL; 538 } 539 540 static struct ib_mad_recv_wc * 541 start_rmpp(struct ib_mad_agent_private *agent, 542 struct ib_mad_recv_wc *mad_recv_wc) 543 { 544 struct mad_rmpp_recv *rmpp_recv; 545 unsigned long flags; 546 547 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc); 548 if (!rmpp_recv) { 549 ib_free_recv_mad(mad_recv_wc); 550 return NULL; 551 } 552 553 spin_lock_irqsave(&agent->lock, flags); 554 if (insert_rmpp_recv(agent, rmpp_recv)) { 555 spin_unlock_irqrestore(&agent->lock, flags); 556 /* duplicate first MAD */ 557 destroy_rmpp_recv(rmpp_recv); 558 return continue_rmpp(agent, mad_recv_wc); 559 } 560 atomic_inc(&rmpp_recv->refcount); 561 562 if (get_last_flag(&mad_recv_wc->recv_buf)) { 563 rmpp_recv->state = RMPP_STATE_COMPLETE; 564 spin_unlock_irqrestore(&agent->lock, flags); 565 complete_rmpp(rmpp_recv); 566 } else { 567 spin_unlock_irqrestore(&agent->lock, flags); 568 /* 40 seconds until we can find the packet lifetimes */ 569 queue_delayed_work(agent->qp_info->port_priv->wq, 570 &rmpp_recv->timeout_work, 571 msecs_to_jiffies(40000)); 572 rmpp_recv->newwin += window_size(agent); 573 ack_recv(rmpp_recv, mad_recv_wc); 574 mad_recv_wc = NULL; 575 } 576 deref_rmpp_recv(rmpp_recv); 577 return mad_recv_wc; 578 } 579 580 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr) 581 { 582 struct ib_rmpp_mad *rmpp_mad; 583 int timeout; 584 u32 paylen = 0; 585 586 rmpp_mad = mad_send_wr->send_buf.mad; 587 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE); 588 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num); 589 590 if (mad_send_wr->seg_num == 1) { 591 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST; 592 paylen = (mad_send_wr->send_buf.seg_count * 593 mad_send_wr->send_buf.seg_rmpp_size) - 594 mad_send_wr->pad; 595 } 596 597 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) { 598 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST; 599 paylen = mad_send_wr->send_buf.seg_rmpp_size - mad_send_wr->pad; 600 } 601 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen); 602 603 /* 2 seconds for an ACK until we can find the packet lifetime */ 604 timeout = mad_send_wr->send_buf.timeout_ms; 605 if (!timeout || timeout > 2000) 606 mad_send_wr->timeout = msecs_to_jiffies(2000); 607 608 return ib_send_mad(mad_send_wr); 609 } 610 611 static void abort_send(struct ib_mad_agent_private *agent, 612 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status) 613 { 614 struct ib_mad_send_wr_private *mad_send_wr; 615 struct ib_mad_send_wc wc; 616 unsigned long flags; 617 618 spin_lock_irqsave(&agent->lock, flags); 619 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); 620 if (!mad_send_wr) 621 goto out; /* Unmatched send */ 622 623 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || 624 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 625 goto out; /* Send is already done */ 626 627 ib_mark_mad_done(mad_send_wr); 628 spin_unlock_irqrestore(&agent->lock, flags); 629 630 wc.status = IB_WC_REM_ABORT_ERR; 631 wc.vendor_err = rmpp_status; 632 wc.send_buf = &mad_send_wr->send_buf; 633 ib_mad_complete_send_wr(mad_send_wr, &wc); 634 return; 635 out: 636 spin_unlock_irqrestore(&agent->lock, flags); 637 } 638 639 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr, 640 int seg_num) 641 { 642 struct list_head *list; 643 644 wr->last_ack = seg_num; 645 list = &wr->last_ack_seg->list; 646 list_for_each_entry(wr->last_ack_seg, list, list) 647 if (wr->last_ack_seg->num == seg_num) 648 break; 649 } 650 651 static void process_ds_ack(struct ib_mad_agent_private *agent, 652 struct ib_mad_recv_wc *mad_recv_wc, int newwin) 653 { 654 struct mad_rmpp_recv *rmpp_recv; 655 656 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc); 657 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE) 658 rmpp_recv->repwin = newwin; 659 } 660 661 static void process_rmpp_ack(struct ib_mad_agent_private *agent, 662 struct ib_mad_recv_wc *mad_recv_wc) 663 { 664 struct ib_mad_send_wr_private *mad_send_wr; 665 struct ib_rmpp_mad *rmpp_mad; 666 unsigned long flags; 667 int seg_num, newwin, ret; 668 669 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 670 if (rmpp_mad->rmpp_hdr.rmpp_status) { 671 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 672 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 673 return; 674 } 675 676 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num); 677 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin); 678 if (newwin < seg_num) { 679 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); 680 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S); 681 return; 682 } 683 684 spin_lock_irqsave(&agent->lock, flags); 685 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc); 686 if (!mad_send_wr) { 687 if (!seg_num) 688 process_ds_ack(agent, mad_recv_wc, newwin); 689 goto out; /* Unmatched or DS RMPP ACK */ 690 } 691 692 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) && 693 (mad_send_wr->timeout)) { 694 spin_unlock_irqrestore(&agent->lock, flags); 695 ack_ds_ack(agent, mad_recv_wc); 696 return; /* Repeated ACK for DS RMPP transaction */ 697 } 698 699 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) || 700 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS)) 701 goto out; /* Send is already done */ 702 703 if (seg_num > mad_send_wr->send_buf.seg_count || 704 seg_num > mad_send_wr->newwin) { 705 spin_unlock_irqrestore(&agent->lock, flags); 706 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); 707 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B); 708 return; 709 } 710 711 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack) 712 goto out; /* Old ACK */ 713 714 if (seg_num > mad_send_wr->last_ack) { 715 adjust_last_ack(mad_send_wr, seg_num); 716 mad_send_wr->retries_left = mad_send_wr->max_retries; 717 } 718 mad_send_wr->newwin = newwin; 719 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { 720 /* If no response is expected, the ACK completes the send */ 721 if (!mad_send_wr->send_buf.timeout_ms) { 722 struct ib_mad_send_wc wc; 723 724 ib_mark_mad_done(mad_send_wr); 725 spin_unlock_irqrestore(&agent->lock, flags); 726 727 wc.status = IB_WC_SUCCESS; 728 wc.vendor_err = 0; 729 wc.send_buf = &mad_send_wr->send_buf; 730 ib_mad_complete_send_wr(mad_send_wr, &wc); 731 return; 732 } 733 if (mad_send_wr->refcount == 1) 734 ib_reset_mad_timeout(mad_send_wr, 735 mad_send_wr->send_buf.timeout_ms); 736 spin_unlock_irqrestore(&agent->lock, flags); 737 ack_ds_ack(agent, mad_recv_wc); 738 return; 739 } else if (mad_send_wr->refcount == 1 && 740 mad_send_wr->seg_num < mad_send_wr->newwin && 741 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) { 742 /* Send failure will just result in a timeout/retry */ 743 ret = send_next_seg(mad_send_wr); 744 if (ret) 745 goto out; 746 747 mad_send_wr->refcount++; 748 list_move_tail(&mad_send_wr->agent_list, 749 &mad_send_wr->mad_agent_priv->send_list); 750 } 751 out: 752 spin_unlock_irqrestore(&agent->lock, flags); 753 } 754 755 static struct ib_mad_recv_wc * 756 process_rmpp_data(struct ib_mad_agent_private *agent, 757 struct ib_mad_recv_wc *mad_recv_wc) 758 { 759 struct ib_rmpp_hdr *rmpp_hdr; 760 u8 rmpp_status; 761 762 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr; 763 764 if (rmpp_hdr->rmpp_status) { 765 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS; 766 goto bad; 767 } 768 769 if (rmpp_hdr->seg_num == cpu_to_be32(1)) { 770 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) { 771 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 772 goto bad; 773 } 774 return start_rmpp(agent, mad_recv_wc); 775 } else { 776 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) { 777 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG; 778 goto bad; 779 } 780 return continue_rmpp(agent, mad_recv_wc); 781 } 782 bad: 783 nack_recv(agent, mad_recv_wc, rmpp_status); 784 ib_free_recv_mad(mad_recv_wc); 785 return NULL; 786 } 787 788 static void process_rmpp_stop(struct ib_mad_agent_private *agent, 789 struct ib_mad_recv_wc *mad_recv_wc) 790 { 791 struct ib_rmpp_mad *rmpp_mad; 792 793 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 794 795 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) { 796 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 797 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 798 } else 799 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); 800 } 801 802 static void process_rmpp_abort(struct ib_mad_agent_private *agent, 803 struct ib_mad_recv_wc *mad_recv_wc) 804 { 805 struct ib_rmpp_mad *rmpp_mad; 806 807 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 808 809 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN || 810 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) { 811 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 812 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS); 813 } else 814 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status); 815 } 816 817 struct ib_mad_recv_wc * 818 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent, 819 struct ib_mad_recv_wc *mad_recv_wc) 820 { 821 struct ib_rmpp_mad *rmpp_mad; 822 823 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad; 824 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE)) 825 return mad_recv_wc; 826 827 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) { 828 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); 829 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV); 830 goto out; 831 } 832 833 switch (rmpp_mad->rmpp_hdr.rmpp_type) { 834 case IB_MGMT_RMPP_TYPE_DATA: 835 return process_rmpp_data(agent, mad_recv_wc); 836 case IB_MGMT_RMPP_TYPE_ACK: 837 process_rmpp_ack(agent, mad_recv_wc); 838 break; 839 case IB_MGMT_RMPP_TYPE_STOP: 840 process_rmpp_stop(agent, mad_recv_wc); 841 break; 842 case IB_MGMT_RMPP_TYPE_ABORT: 843 process_rmpp_abort(agent, mad_recv_wc); 844 break; 845 default: 846 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); 847 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT); 848 break; 849 } 850 out: 851 ib_free_recv_mad(mad_recv_wc); 852 return NULL; 853 } 854 855 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr) 856 { 857 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv; 858 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad; 859 struct mad_rmpp_recv *rmpp_recv; 860 struct ib_ah_attr ah_attr; 861 unsigned long flags; 862 int newwin = 1; 863 864 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP)) 865 goto out; 866 867 spin_lock_irqsave(&agent->lock, flags); 868 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) { 869 if (rmpp_recv->tid != mad_hdr->tid || 870 rmpp_recv->mgmt_class != mad_hdr->mgmt_class || 871 rmpp_recv->class_version != mad_hdr->class_version || 872 (rmpp_recv->method & IB_MGMT_METHOD_RESP)) 873 continue; 874 875 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr)) 876 continue; 877 878 if (rmpp_recv->slid == ah_attr.dlid) { 879 newwin = rmpp_recv->repwin; 880 break; 881 } 882 } 883 spin_unlock_irqrestore(&agent->lock, flags); 884 out: 885 return newwin; 886 } 887 888 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr) 889 { 890 struct ib_rmpp_mad *rmpp_mad; 891 int ret; 892 893 rmpp_mad = mad_send_wr->send_buf.mad; 894 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 895 IB_MGMT_RMPP_FLAG_ACTIVE)) 896 return IB_RMPP_RESULT_UNHANDLED; 897 898 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) { 899 mad_send_wr->seg_num = 1; 900 return IB_RMPP_RESULT_INTERNAL; 901 } 902 903 mad_send_wr->newwin = init_newwin(mad_send_wr); 904 905 /* We need to wait for the final ACK even if there isn't a response */ 906 mad_send_wr->refcount += (mad_send_wr->timeout == 0); 907 ret = send_next_seg(mad_send_wr); 908 if (!ret) 909 return IB_RMPP_RESULT_CONSUMED; 910 return ret; 911 } 912 913 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr, 914 struct ib_mad_send_wc *mad_send_wc) 915 { 916 struct ib_rmpp_mad *rmpp_mad; 917 int ret; 918 919 rmpp_mad = mad_send_wr->send_buf.mad; 920 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 921 IB_MGMT_RMPP_FLAG_ACTIVE)) 922 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 923 924 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) 925 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */ 926 927 if (mad_send_wc->status != IB_WC_SUCCESS || 928 mad_send_wr->status != IB_WC_SUCCESS) 929 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */ 930 931 if (!mad_send_wr->timeout) 932 return IB_RMPP_RESULT_PROCESSED; /* Response received */ 933 934 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) { 935 mad_send_wr->timeout = 936 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms); 937 return IB_RMPP_RESULT_PROCESSED; /* Send done */ 938 } 939 940 if (mad_send_wr->seg_num == mad_send_wr->newwin || 941 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) 942 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */ 943 944 ret = send_next_seg(mad_send_wr); 945 if (ret) { 946 mad_send_wc->status = IB_WC_GENERAL_ERR; 947 return IB_RMPP_RESULT_PROCESSED; 948 } 949 return IB_RMPP_RESULT_CONSUMED; 950 } 951 952 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr) 953 { 954 struct ib_rmpp_mad *rmpp_mad; 955 int ret; 956 957 rmpp_mad = mad_send_wr->send_buf.mad; 958 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & 959 IB_MGMT_RMPP_FLAG_ACTIVE)) 960 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */ 961 962 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) 963 return IB_RMPP_RESULT_PROCESSED; 964 965 mad_send_wr->seg_num = mad_send_wr->last_ack; 966 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg; 967 968 ret = send_next_seg(mad_send_wr); 969 if (ret) 970 return IB_RMPP_RESULT_PROCESSED; 971 972 return IB_RMPP_RESULT_CONSUMED; 973 }
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