sys/ofed/drivers/infiniband/core/mad_rmpp.c

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