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  * $Id: mad_rmpp.c 1921 2005-03-02 22:58:44Z sean.hefty $
  34  */
  35
  36 #include "mad_priv.h"
  37 #include "mad_rmpp.h"
  38
  39 enum rmpp_state {
  40         RMPP_STATE_ACTIVE,
  41         RMPP_STATE_TIMEOUT,
  42         RMPP_STATE_COMPLETE
  43 };
  44
  45 struct mad_rmpp_recv {
  46         struct ib_mad_agent_private *agent;
  47         struct list_head list;
  48         struct work_struct timeout_work;
  49         struct work_struct cleanup_work;
  50         struct completion comp;
  51         enum rmpp_state state;
  52         spinlock_t lock;
  53         atomic_t refcount;
  54
  55         struct ib_ah *ah;
  56         struct ib_mad_recv_wc *rmpp_wc;
  57         struct ib_mad_recv_buf *cur_seg_buf;
  58         int last_ack;
  59         int seg_num;
  60         int newwin;
  61         int repwin;
  62
  63         __be64 tid;
  64         u32 src_qp;
  65         u16 slid;
  66         u8 mgmt_class;
  67         u8 class_version;
  68         u8 method;
  69 };
  70
  71 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
  72 {
  73         if (atomic_dec_and_test(&rmpp_recv->refcount))
  74                 complete(&rmpp_recv->comp);
  75 }
  76
  77 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
  78 {
  79         deref_rmpp_recv(rmpp_recv);
  80         wait_for_completion(&rmpp_recv->comp);
  81         ib_destroy_ah(rmpp_recv->ah);
  82         kfree(rmpp_recv);
  83 }
  84
  85 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
  86 {
  87         struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
  88         unsigned long flags;
  89
  90         spin_lock_irqsave(&agent->lock, flags);
  91         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
  92                 cancel_delayed_work(&rmpp_recv->timeout_work);
  93                 cancel_delayed_work(&rmpp_recv->cleanup_work);
  94         }
  95         spin_unlock_irqrestore(&agent->lock, flags);
  96
  97         flush_workqueue(agent->qp_info->port_priv->wq);
  98
  99         list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
 100                                  &agent->rmpp_list, list) {
 101                 list_del(&rmpp_recv->list);
 102                 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
 103                         ib_free_recv_mad(rmpp_recv->rmpp_wc);
 104                 destroy_rmpp_recv(rmpp_recv);
 105         }
 106 }
 107
 108 static void format_ack(struct ib_mad_send_buf *msg,
 109                        struct ib_rmpp_mad *data,
 110                        struct mad_rmpp_recv *rmpp_recv)
 111 {
 112         struct ib_rmpp_mad *ack = msg->mad;
 113         unsigned long flags;
 114
 115         memcpy(ack, &data->mad_hdr, msg->hdr_len);
 116
 117         ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 118         ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
 119         ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 120
 121         spin_lock_irqsave(&rmpp_recv->lock, flags);
 122         rmpp_recv->last_ack = rmpp_recv->seg_num;
 123         ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
 124         ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
 125         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 126 }
 127
 128 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
 129                      struct ib_mad_recv_wc *recv_wc)
 130 {
 131         struct ib_mad_send_buf *msg;
 132         int ret, hdr_len;
 133
 134         hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 135         msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
 136                                  recv_wc->wc->pkey_index, 1, hdr_len,
 137                                  0, GFP_KERNEL);
 138         if (!msg)
 139                 return;
 140
 141         format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
 142         msg->ah = rmpp_recv->ah;
 143         ret = ib_post_send_mad(msg, NULL);
 144         if (ret)
 145                 ib_free_send_mad(msg);
 146 }
 147
 148 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
 149                                                   struct ib_mad_recv_wc *recv_wc)
 150 {
 151         struct ib_mad_send_buf *msg;
 152         struct ib_ah *ah;
 153         int hdr_len;
 154
 155         ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
 156                                   recv_wc->recv_buf.grh, agent->port_num);
 157         if (IS_ERR(ah))
 158                 return (void *) ah;
 159
 160         hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 161         msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
 162                                  recv_wc->wc->pkey_index, 1,
 163                                  hdr_len, 0, GFP_KERNEL);
 164         if (IS_ERR(msg))
 165                 ib_destroy_ah(ah);
 166         else
 167                 msg->ah = ah;
 168
 169         return msg;
 170 }
 171
 172 static void ack_ds_ack(struct ib_mad_agent_private *agent,
 173                        struct ib_mad_recv_wc *recv_wc)
 174 {
 175         struct ib_mad_send_buf *msg;
 176         struct ib_rmpp_mad *rmpp_mad;
 177         int ret;
 178
 179         msg = alloc_response_msg(&agent->agent, recv_wc);
 180         if (IS_ERR(msg))
 181                 return;
 182
 183         rmpp_mad = msg->mad;
 184         memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
 185
 186         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 187         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 188         rmpp_mad->rmpp_hdr.seg_num = 0;
 189         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
 190
 191         ret = ib_post_send_mad(msg, NULL);
 192         if (ret) {
 193                 ib_destroy_ah(msg->ah);
 194                 ib_free_send_mad(msg);
 195         }
 196 }
 197
 198 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
 199 {
 200         struct ib_rmpp_mad *rmpp_mad = mad_send_wc->send_buf->mad;
 201
 202         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_ACK)
 203                 ib_destroy_ah(mad_send_wc->send_buf->ah);
 204         ib_free_send_mad(mad_send_wc->send_buf);
 205 }
 206
 207 static void nack_recv(struct ib_mad_agent_private *agent,
 208                       struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
 209 {
 210         struct ib_mad_send_buf *msg;
 211         struct ib_rmpp_mad *rmpp_mad;
 212         int ret;
 213
 214         msg = alloc_response_msg(&agent->agent, recv_wc);
 215         if (IS_ERR(msg))
 216                 return;
 217
 218         rmpp_mad = msg->mad;
 219         memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
 220
 221         rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 222         rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
 223         rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
 224         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 225         rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
 226         rmpp_mad->rmpp_hdr.seg_num = 0;
 227         rmpp_mad->rmpp_hdr.paylen_newwin = 0;
 228
 229         ret = ib_post_send_mad(msg, NULL);
 230         if (ret) {
 231                 ib_destroy_ah(msg->ah);
 232                 ib_free_send_mad(msg);
 233         }
 234 }
 235
 236 static void recv_timeout_handler(void *data)
 237 {
 238         struct mad_rmpp_recv *rmpp_recv = data;
 239         struct ib_mad_recv_wc *rmpp_wc;
 240         unsigned long flags;
 241
 242         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 243         if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
 244                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 245                 return;
 246         }
 247         rmpp_recv->state = RMPP_STATE_TIMEOUT;
 248         list_del(&rmpp_recv->list);
 249         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 250
 251         rmpp_wc = rmpp_recv->rmpp_wc;
 252         nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
 253         destroy_rmpp_recv(rmpp_recv);
 254         ib_free_recv_mad(rmpp_wc);
 255 }
 256
 257 static void recv_cleanup_handler(void *data)
 258 {
 259         struct mad_rmpp_recv *rmpp_recv = data;
 260         unsigned long flags;
 261
 262         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 263         list_del(&rmpp_recv->list);
 264         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 265         destroy_rmpp_recv(rmpp_recv);
 266 }
 267
 268 static struct mad_rmpp_recv *
 269 create_rmpp_recv(struct ib_mad_agent_private *agent,
 270                  struct ib_mad_recv_wc *mad_recv_wc)
 271 {
 272         struct mad_rmpp_recv *rmpp_recv;
 273         struct ib_mad_hdr *mad_hdr;
 274
 275         rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
 276         if (!rmpp_recv)
 277                 return NULL;
 278
 279         rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
 280                                              mad_recv_wc->wc,
 281                                              mad_recv_wc->recv_buf.grh,
 282                                              agent->agent.port_num);
 283         if (IS_ERR(rmpp_recv->ah))
 284                 goto error;
 285
 286         rmpp_recv->agent = agent;
 287         init_completion(&rmpp_recv->comp);
 288         INIT_WORK(&rmpp_recv->timeout_work, recv_timeout_handler, rmpp_recv);
 289         INIT_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler, rmpp_recv);
 290         spin_lock_init(&rmpp_recv->lock);
 291         rmpp_recv->state = RMPP_STATE_ACTIVE;
 292         atomic_set(&rmpp_recv->refcount, 1);
 293
 294         rmpp_recv->rmpp_wc = mad_recv_wc;
 295         rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
 296         rmpp_recv->newwin = 1;
 297         rmpp_recv->seg_num = 1;
 298         rmpp_recv->last_ack = 0;
 299         rmpp_recv->repwin = 1;
 300
 301         mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 302         rmpp_recv->tid = mad_hdr->tid;
 303         rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
 304         rmpp_recv->slid = mad_recv_wc->wc->slid;
 305         rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
 306         rmpp_recv->class_version = mad_hdr->class_version;
 307         rmpp_recv->method  = mad_hdr->method;
 308         return rmpp_recv;
 309
 310 error:  kfree(rmpp_recv);
 311         return NULL;
 312 }
 313
 314 static struct mad_rmpp_recv *
 315 find_rmpp_recv(struct ib_mad_agent_private *agent,
 316                struct ib_mad_recv_wc *mad_recv_wc)
 317 {
 318         struct mad_rmpp_recv *rmpp_recv;
 319         struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 320
 321         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 322                 if (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                         return rmpp_recv;
 329         }
 330         return NULL;
 331 }
 332
 333 static struct mad_rmpp_recv *
 334 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
 335                   struct ib_mad_recv_wc *mad_recv_wc)
 336 {
 337         struct mad_rmpp_recv *rmpp_recv;
 338         unsigned long flags;
 339
 340         spin_lock_irqsave(&agent->lock, flags);
 341         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 342         if (rmpp_recv)
 343                 atomic_inc(&rmpp_recv->refcount);
 344         spin_unlock_irqrestore(&agent->lock, flags);
 345         return rmpp_recv;
 346 }
 347
 348 static struct mad_rmpp_recv *
 349 insert_rmpp_recv(struct ib_mad_agent_private *agent,
 350                  struct mad_rmpp_recv *rmpp_recv)
 351 {
 352         struct mad_rmpp_recv *cur_rmpp_recv;
 353
 354         cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
 355         if (!cur_rmpp_recv)
 356                 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
 357
 358         return cur_rmpp_recv;
 359 }
 360
 361 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
 362 {
 363         struct ib_rmpp_mad *rmpp_mad;
 364
 365         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 366         return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
 367 }
 368
 369 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
 370 {
 371         struct ib_rmpp_mad *rmpp_mad;
 372
 373         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 374         return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 375 }
 376
 377 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
 378                                                     struct ib_mad_recv_buf *seg)
 379 {
 380         if (seg->list.next == rmpp_list)
 381                 return NULL;
 382
 383         return container_of(seg->list.next, struct ib_mad_recv_buf, list);
 384 }
 385
 386 static inline int window_size(struct ib_mad_agent_private *agent)
 387 {
 388         return max(agent->qp_info->recv_queue.max_active >> 3, 1);
 389 }
 390
 391 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
 392                                                   int seg_num)
 393 {
 394         struct ib_mad_recv_buf *seg_buf;
 395         int cur_seg_num;
 396
 397         list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
 398                 cur_seg_num = get_seg_num(seg_buf);
 399                 if (seg_num > cur_seg_num)
 400                         return seg_buf;
 401                 if (seg_num == cur_seg_num)
 402                         break;
 403         }
 404         return NULL;
 405 }
 406
 407 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
 408                            struct ib_mad_recv_buf *new_buf)
 409 {
 410         struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
 411
 412         while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
 413                 rmpp_recv->cur_seg_buf = new_buf;
 414                 rmpp_recv->seg_num++;
 415                 new_buf = get_next_seg(rmpp_list, new_buf);
 416         }
 417 }
 418
 419 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
 420 {
 421         struct ib_rmpp_mad *rmpp_mad;
 422         int hdr_size, data_size, pad;
 423
 424         rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
 425
 426         hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
 427         data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
 428         pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 429         if (pad > IB_MGMT_RMPP_DATA || pad < 0)
 430                 pad = 0;
 431
 432         return hdr_size + rmpp_recv->seg_num * data_size - pad;
 433 }
 434
 435 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
 436 {
 437         struct ib_mad_recv_wc *rmpp_wc;
 438
 439         ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
 440         if (rmpp_recv->seg_num > 1)
 441                 cancel_delayed_work(&rmpp_recv->timeout_work);
 442
 443         rmpp_wc = rmpp_recv->rmpp_wc;
 444         rmpp_wc->mad_len = get_mad_len(rmpp_recv);
 445         /* 10 seconds until we can find the packet lifetime */
 446         queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
 447                            &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
 448         return rmpp_wc;
 449 }
 450
 451 static struct ib_mad_recv_wc *
 452 continue_rmpp(struct ib_mad_agent_private *agent,
 453               struct ib_mad_recv_wc *mad_recv_wc)
 454 {
 455         struct mad_rmpp_recv *rmpp_recv;
 456         struct ib_mad_recv_buf *prev_buf;
 457         struct ib_mad_recv_wc *done_wc;
 458         int seg_num;
 459         unsigned long flags;
 460
 461         rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
 462         if (!rmpp_recv)
 463                 goto drop1;
 464
 465         seg_num = get_seg_num(&mad_recv_wc->recv_buf);
 466
 467         spin_lock_irqsave(&rmpp_recv->lock, flags);
 468         if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
 469             (seg_num > rmpp_recv->newwin))
 470                 goto drop3;
 471
 472         if ((seg_num <= rmpp_recv->last_ack) ||
 473             (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
 474                 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 475                 ack_recv(rmpp_recv, mad_recv_wc);
 476                 goto drop2;
 477         }
 478
 479         prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
 480         if (!prev_buf)
 481                 goto drop3;
 482
 483         done_wc = NULL;
 484         list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
 485         if (rmpp_recv->cur_seg_buf == prev_buf) {
 486                 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
 487                 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
 488                         rmpp_recv->state = RMPP_STATE_COMPLETE;
 489                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 490                         done_wc = complete_rmpp(rmpp_recv);
 491                         goto out;
 492                 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
 493                         rmpp_recv->newwin += window_size(agent);
 494                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 495                         ack_recv(rmpp_recv, mad_recv_wc);
 496                         goto out;
 497                 }
 498         }
 499         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 500 out:
 501         deref_rmpp_recv(rmpp_recv);
 502         return done_wc;
 503
 504 drop3:  spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 505 drop2:  deref_rmpp_recv(rmpp_recv);
 506 drop1:  ib_free_recv_mad(mad_recv_wc);
 507         return NULL;
 508 }
 509
 510 static struct ib_mad_recv_wc *
 511 start_rmpp(struct ib_mad_agent_private *agent,
 512            struct ib_mad_recv_wc *mad_recv_wc)
 513 {
 514         struct mad_rmpp_recv *rmpp_recv;
 515         unsigned long flags;
 516
 517         rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
 518         if (!rmpp_recv) {
 519                 ib_free_recv_mad(mad_recv_wc);
 520                 return NULL;
 521         }
 522
 523         spin_lock_irqsave(&agent->lock, flags);
 524         if (insert_rmpp_recv(agent, rmpp_recv)) {
 525                 spin_unlock_irqrestore(&agent->lock, flags);
 526                 /* duplicate first MAD */
 527                 destroy_rmpp_recv(rmpp_recv);
 528                 return continue_rmpp(agent, mad_recv_wc);
 529         }
 530         atomic_inc(&rmpp_recv->refcount);
 531
 532         if (get_last_flag(&mad_recv_wc->recv_buf)) {
 533                 rmpp_recv->state = RMPP_STATE_COMPLETE;
 534                 spin_unlock_irqrestore(&agent->lock, flags);
 535                 complete_rmpp(rmpp_recv);
 536         } else {
 537                 spin_unlock_irqrestore(&agent->lock, flags);
 538                 /* 40 seconds until we can find the packet lifetimes */
 539                 queue_delayed_work(agent->qp_info->port_priv->wq,
 540                                    &rmpp_recv->timeout_work,
 541                                    msecs_to_jiffies(40000));
 542                 rmpp_recv->newwin += window_size(agent);
 543                 ack_recv(rmpp_recv, mad_recv_wc);
 544                 mad_recv_wc = NULL;
 545         }
 546         deref_rmpp_recv(rmpp_recv);
 547         return mad_recv_wc;
 548 }
 549
 550 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
 551 {
 552         struct ib_rmpp_mad *rmpp_mad;
 553         int timeout;
 554         u32 paylen = 0;
 555
 556         rmpp_mad = mad_send_wr->send_buf.mad;
 557         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 558         rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
 559
 560         if (mad_send_wr->seg_num == 1) {
 561                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
 562                 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
 563                          mad_send_wr->pad;
 564         }
 565
 566         if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
 567                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
 568                 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
 569         }
 570         rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
 571
 572         /* 2 seconds for an ACK until we can find the packet lifetime */
 573         timeout = mad_send_wr->send_buf.timeout_ms;
 574         if (!timeout || timeout > 2000)
 575                 mad_send_wr->timeout = msecs_to_jiffies(2000);
 576
 577         return ib_send_mad(mad_send_wr);
 578 }
 579
 580 static void abort_send(struct ib_mad_agent_private *agent,
 581                        struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
 582 {
 583         struct ib_mad_send_wr_private *mad_send_wr;
 584         struct ib_mad_send_wc wc;
 585         unsigned long flags;
 586
 587         spin_lock_irqsave(&agent->lock, flags);
 588         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
 589         if (!mad_send_wr)
 590                 goto out;       /* Unmatched send */
 591
 592         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 593             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 594                 goto out;       /* Send is already done */
 595
 596         ib_mark_mad_done(mad_send_wr);
 597         spin_unlock_irqrestore(&agent->lock, flags);
 598
 599         wc.status = IB_WC_REM_ABORT_ERR;
 600         wc.vendor_err = rmpp_status;
 601         wc.send_buf = &mad_send_wr->send_buf;
 602         ib_mad_complete_send_wr(mad_send_wr, &wc);
 603         return;
 604 out:
 605         spin_unlock_irqrestore(&agent->lock, flags);
 606 }
 607
 608 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
 609                                    int seg_num)
 610 {
 611         struct list_head *list;
 612
 613         wr->last_ack = seg_num;
 614         list = &wr->last_ack_seg->list;
 615         list_for_each_entry(wr->last_ack_seg, list, list)
 616                 if (wr->last_ack_seg->num == seg_num)
 617                         break;
 618 }
 619
 620 static void process_ds_ack(struct ib_mad_agent_private *agent,
 621                            struct ib_mad_recv_wc *mad_recv_wc, int newwin)
 622 {
 623         struct mad_rmpp_recv *rmpp_recv;
 624
 625         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 626         if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
 627                 rmpp_recv->repwin = newwin;
 628 }
 629
 630 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
 631                              struct ib_mad_recv_wc *mad_recv_wc)
 632 {
 633         struct ib_mad_send_wr_private *mad_send_wr;
 634         struct ib_rmpp_mad *rmpp_mad;
 635         unsigned long flags;
 636         int seg_num, newwin, ret;
 637
 638         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 639         if (rmpp_mad->rmpp_hdr.rmpp_status) {
 640                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 641                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 642                 return;
 643         }
 644
 645         seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 646         newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 647         if (newwin < seg_num) {
 648                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 649                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
 650                 return;
 651         }
 652
 653         spin_lock_irqsave(&agent->lock, flags);
 654         mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
 655         if (!mad_send_wr) {
 656                 if (!seg_num)
 657                         process_ds_ack(agent, mad_recv_wc, newwin);
 658                 goto out;       /* Unmatched or DS RMPP ACK */
 659         }
 660
 661         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
 662             (mad_send_wr->timeout)) {
 663                 spin_unlock_irqrestore(&agent->lock, flags);
 664                 ack_ds_ack(agent, mad_recv_wc);
 665                 return;         /* Repeated ACK for DS RMPP transaction */
 666         }
 667
 668         if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
 669             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 670                 goto out;       /* Send is already done */
 671
 672         if (seg_num > mad_send_wr->send_buf.seg_count ||
 673             seg_num > mad_send_wr->newwin) {
 674                 spin_unlock_irqrestore(&agent->lock, flags);
 675                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 676                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
 677                 return;
 678         }
 679
 680         if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
 681                 goto out;       /* Old ACK */
 682
 683         if (seg_num > mad_send_wr->last_ack) {
 684                 adjust_last_ack(mad_send_wr, seg_num);
 685                 mad_send_wr->retries = mad_send_wr->send_buf.retries;
 686         }
 687         mad_send_wr->newwin = newwin;
 688         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 689                 /* If no response is expected, the ACK completes the send */
 690                 if (!mad_send_wr->send_buf.timeout_ms) {
 691                         struct ib_mad_send_wc wc;
 692
 693                         ib_mark_mad_done(mad_send_wr);
 694                         spin_unlock_irqrestore(&agent->lock, flags);
 695
 696                         wc.status = IB_WC_SUCCESS;
 697                         wc.vendor_err = 0;
 698                         wc.send_buf = &mad_send_wr->send_buf;
 699                         ib_mad_complete_send_wr(mad_send_wr, &wc);
 700                         return;
 701                 }
 702                 if (mad_send_wr->refcount == 1)
 703                         ib_reset_mad_timeout(mad_send_wr,
 704                                              mad_send_wr->send_buf.timeout_ms);
 705                 spin_unlock_irqrestore(&agent->lock, flags);
 706                 ack_ds_ack(agent, mad_recv_wc);
 707                 return;
 708         } else if (mad_send_wr->refcount == 1 &&
 709                    mad_send_wr->seg_num < mad_send_wr->newwin &&
 710                    mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
 711                 /* Send failure will just result in a timeout/retry */
 712                 ret = send_next_seg(mad_send_wr);
 713                 if (ret)
 714                         goto out;
 715
 716                 mad_send_wr->refcount++;
 717                 list_move_tail(&mad_send_wr->agent_list,
 718                               &mad_send_wr->mad_agent_priv->send_list);
 719         }
 720 out:
 721         spin_unlock_irqrestore(&agent->lock, flags);
 722 }
 723
 724 static struct ib_mad_recv_wc *
 725 process_rmpp_data(struct ib_mad_agent_private *agent,
 726                   struct ib_mad_recv_wc *mad_recv_wc)
 727 {
 728         struct ib_rmpp_hdr *rmpp_hdr;
 729         u8 rmpp_status;
 730
 731         rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
 732
 733         if (rmpp_hdr->rmpp_status) {
 734                 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
 735                 goto bad;
 736         }
 737
 738         if (rmpp_hdr->seg_num == __constant_htonl(1)) {
 739                 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
 740                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 741                         goto bad;
 742                 }
 743                 return start_rmpp(agent, mad_recv_wc);
 744         } else {
 745                 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
 746                         rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
 747                         goto bad;
 748                 }
 749                 return continue_rmpp(agent, mad_recv_wc);
 750         }
 751 bad:
 752         nack_recv(agent, mad_recv_wc, rmpp_status);
 753         ib_free_recv_mad(mad_recv_wc);
 754         return NULL;
 755 }
 756
 757 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
 758                               struct ib_mad_recv_wc *mad_recv_wc)
 759 {
 760         struct ib_rmpp_mad *rmpp_mad;
 761
 762         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 763
 764         if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
 765                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 766                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 767         } else
 768                 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
 769 }
 770
 771 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
 772                                struct ib_mad_recv_wc *mad_recv_wc)
 773 {
 774         struct ib_rmpp_mad *rmpp_mad;
 775
 776         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 777
 778         if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
 779             rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
 780                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 781                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
 782         } else
 783                 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
 784 }
 785
 786 struct ib_mad_recv_wc *
 787 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
 788                         struct ib_mad_recv_wc *mad_recv_wc)
 789 {
 790         struct ib_rmpp_mad *rmpp_mad;
 791
 792         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 793         if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
 794                 return mad_recv_wc;
 795
 796         if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
 797                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
 798                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
 799                 goto out;
 800         }
 801
 802         switch (rmpp_mad->rmpp_hdr.rmpp_type) {
 803         case IB_MGMT_RMPP_TYPE_DATA:
 804                 return process_rmpp_data(agent, mad_recv_wc);
 805         case IB_MGMT_RMPP_TYPE_ACK:
 806                 process_rmpp_ack(agent, mad_recv_wc);
 807                 break;
 808         case IB_MGMT_RMPP_TYPE_STOP:
 809                 process_rmpp_stop(agent, mad_recv_wc);
 810                 break;
 811         case IB_MGMT_RMPP_TYPE_ABORT:
 812                 process_rmpp_abort(agent, mad_recv_wc);
 813                 break;
 814         default:
 815                 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 816                 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
 817                 break;
 818         }
 819 out:
 820         ib_free_recv_mad(mad_recv_wc);
 821         return NULL;
 822 }
 823
 824 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
 825 {
 826         struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
 827         struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
 828         struct mad_rmpp_recv *rmpp_recv;
 829         struct ib_ah_attr ah_attr;
 830         unsigned long flags;
 831         int newwin = 1;
 832
 833         if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
 834                 goto out;
 835
 836         spin_lock_irqsave(&agent->lock, flags);
 837         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 838                 if (rmpp_recv->tid != mad_hdr->tid ||
 839                     rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
 840                     rmpp_recv->class_version != mad_hdr->class_version ||
 841                     (rmpp_recv->method & IB_MGMT_METHOD_RESP))
 842                         continue;
 843
 844                 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
 845                         continue;
 846
 847                 if (rmpp_recv->slid == ah_attr.dlid) {
 848                         newwin = rmpp_recv->repwin;
 849                         break;
 850                 }
 851         }
 852         spin_unlock_irqrestore(&agent->lock, flags);
 853 out:
 854         return newwin;
 855 }
 856
 857 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
 858 {
 859         struct ib_rmpp_mad *rmpp_mad;
 860         int ret;
 861
 862         rmpp_mad = mad_send_wr->send_buf.mad;
 863         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 864               IB_MGMT_RMPP_FLAG_ACTIVE))
 865                 return IB_RMPP_RESULT_UNHANDLED;
 866
 867         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
 868                 mad_send_wr->seg_num = 1;
 869                 return IB_RMPP_RESULT_INTERNAL;
 870         }
 871
 872         mad_send_wr->newwin = init_newwin(mad_send_wr);
 873
 874         /* We need to wait for the final ACK even if there isn't a response */
 875         mad_send_wr->refcount += (mad_send_wr->timeout == 0);
 876         ret = send_next_seg(mad_send_wr);
 877         if (!ret)
 878                 return IB_RMPP_RESULT_CONSUMED;
 879         return ret;
 880 }
 881
 882 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
 883                             struct ib_mad_send_wc *mad_send_wc)
 884 {
 885         struct ib_rmpp_mad *rmpp_mad;
 886         int ret;
 887
 888         rmpp_mad = mad_send_wr->send_buf.mad;
 889         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 890               IB_MGMT_RMPP_FLAG_ACTIVE))
 891                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 892
 893         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
 894                 return IB_RMPP_RESULT_INTERNAL;  /* ACK, STOP, or ABORT */
 895
 896         if (mad_send_wc->status != IB_WC_SUCCESS ||
 897             mad_send_wr->status != IB_WC_SUCCESS)
 898                 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
 899
 900         if (!mad_send_wr->timeout)
 901                 return IB_RMPP_RESULT_PROCESSED; /* Response received */
 902
 903         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
 904                 mad_send_wr->timeout =
 905                         msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
 906                 return IB_RMPP_RESULT_PROCESSED; /* Send done */
 907         }
 908
 909         if (mad_send_wr->seg_num == mad_send_wr->newwin ||
 910             mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
 911                 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
 912
 913         ret = send_next_seg(mad_send_wr);
 914         if (ret) {
 915                 mad_send_wc->status = IB_WC_GENERAL_ERR;
 916                 return IB_RMPP_RESULT_PROCESSED;
 917         }
 918         return IB_RMPP_RESULT_CONSUMED;
 919 }
 920
 921 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
 922 {
 923         struct ib_rmpp_mad *rmpp_mad;
 924         int ret;
 925
 926         rmpp_mad = mad_send_wr->send_buf.mad;
 927         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 928               IB_MGMT_RMPP_FLAG_ACTIVE))
 929                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 930
 931         if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
 932                 return IB_RMPP_RESULT_PROCESSED;
 933
 934         mad_send_wr->seg_num = mad_send_wr->last_ack;
 935         mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
 936
 937         ret = send_next_seg(mad_send_wr);
 938         if (ret)
 939                 return IB_RMPP_RESULT_PROCESSED;
 940
 941         return IB_RMPP_RESULT_CONSUMED;
 942 }