drivers/infiniband/core/mad_rmpp.c

   1 /*
   2  * Copyright (c) 2005 Intel Inc. All rights reserved.
   3  * Copyright (c) 2005 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 <linux/dma-mapping.h>
  37
  38 #include "mad_priv.h"
  39 #include "mad_rmpp.h"
  40
  41 enum rmpp_state {
  42         RMPP_STATE_ACTIVE,
  43         RMPP_STATE_TIMEOUT,
  44         RMPP_STATE_COMPLETE
  45 };
  46
  47 struct mad_rmpp_recv {
  48         struct ib_mad_agent_private *agent;
  49         struct list_head list;
  50         struct work_struct timeout_work;
  51         struct work_struct cleanup_work;
  52         wait_queue_head_t wait;
  53         enum rmpp_state state;
  54         spinlock_t lock;
  55         atomic_t refcount;
  56
  57         struct ib_ah *ah;
  58         struct ib_mad_recv_wc *rmpp_wc;
  59         struct ib_mad_recv_buf *cur_seg_buf;
  60         int last_ack;
  61         int seg_num;
  62         int newwin;
  63
  64         u64 tid;
  65         u32 src_qp;
  66         u16 slid;
  67         u8 mgmt_class;
  68         u8 class_version;
  69         u8 method;
  70 };
  71
  72 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
  73 {
  74         atomic_dec(&rmpp_recv->refcount);
  75         wait_event(rmpp_recv->wait, !atomic_read(&rmpp_recv->refcount));
  76         ib_destroy_ah(rmpp_recv->ah);
  77         kfree(rmpp_recv);
  78 }
  79
  80 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
  81 {
  82         struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
  83         unsigned long flags;
  84
  85         spin_lock_irqsave(&agent->lock, flags);
  86         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
  87                 cancel_delayed_work(&rmpp_recv->timeout_work);
  88                 cancel_delayed_work(&rmpp_recv->cleanup_work);
  89         }
  90         spin_unlock_irqrestore(&agent->lock, flags);
  91
  92         flush_workqueue(agent->qp_info->port_priv->wq);
  93
  94         list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
  95                                  &agent->rmpp_list, list) {
  96                 list_del(&rmpp_recv->list);
  97                 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
  98                         ib_free_recv_mad(rmpp_recv->rmpp_wc);
  99                 destroy_rmpp_recv(rmpp_recv);
 100         }
 101 }
 102
 103 static void recv_timeout_handler(void *data)
 104 {
 105         struct mad_rmpp_recv *rmpp_recv = data;
 106         struct ib_mad_recv_wc *rmpp_wc;
 107         unsigned long flags;
 108
 109         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 110         if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
 111                 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 112                 return;
 113         }
 114         rmpp_recv->state = RMPP_STATE_TIMEOUT;
 115         list_del(&rmpp_recv->list);
 116         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 117
 118         /* TODO: send abort. */
 119         rmpp_wc = rmpp_recv->rmpp_wc;
 120         destroy_rmpp_recv(rmpp_recv);
 121         ib_free_recv_mad(rmpp_wc);
 122 }
 123
 124 static void recv_cleanup_handler(void *data)
 125 {
 126         struct mad_rmpp_recv *rmpp_recv = data;
 127         unsigned long flags;
 128
 129         spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
 130         list_del(&rmpp_recv->list);
 131         spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
 132         destroy_rmpp_recv(rmpp_recv);
 133 }
 134
 135 static struct mad_rmpp_recv *
 136 create_rmpp_recv(struct ib_mad_agent_private *agent,
 137                  struct ib_mad_recv_wc *mad_recv_wc)
 138 {
 139         struct mad_rmpp_recv *rmpp_recv;
 140         struct ib_mad_hdr *mad_hdr;
 141
 142         rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
 143         if (!rmpp_recv)
 144                 return NULL;
 145
 146         rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
 147                                              mad_recv_wc->wc,
 148                                              mad_recv_wc->recv_buf.grh,
 149                                              agent->agent.port_num);
 150         if (IS_ERR(rmpp_recv->ah))
 151                 goto error;
 152
 153         rmpp_recv->agent = agent;
 154         init_waitqueue_head(&rmpp_recv->wait);
 155         INIT_WORK(&rmpp_recv->timeout_work, recv_timeout_handler, rmpp_recv);
 156         INIT_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler, rmpp_recv);
 157         spin_lock_init(&rmpp_recv->lock);
 158         rmpp_recv->state = RMPP_STATE_ACTIVE;
 159         atomic_set(&rmpp_recv->refcount, 1);
 160
 161         rmpp_recv->rmpp_wc = mad_recv_wc;
 162         rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
 163         rmpp_recv->newwin = 1;
 164         rmpp_recv->seg_num = 1;
 165         rmpp_recv->last_ack = 0;
 166
 167         mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 168         rmpp_recv->tid = mad_hdr->tid;
 169         rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
 170         rmpp_recv->slid = mad_recv_wc->wc->slid;
 171         rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
 172         rmpp_recv->class_version = mad_hdr->class_version;
 173         rmpp_recv->method  = mad_hdr->method;
 174         return rmpp_recv;
 175
 176 error:  kfree(rmpp_recv);
 177         return NULL;
 178 }
 179
 180 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
 181 {
 182         if (atomic_dec_and_test(&rmpp_recv->refcount))
 183                 wake_up(&rmpp_recv->wait);
 184 }
 185
 186 static struct mad_rmpp_recv *
 187 find_rmpp_recv(struct ib_mad_agent_private *agent,
 188                struct ib_mad_recv_wc *mad_recv_wc)
 189 {
 190         struct mad_rmpp_recv *rmpp_recv;
 191         struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
 192
 193         list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 194                 if (rmpp_recv->tid == mad_hdr->tid &&
 195                     rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
 196                     rmpp_recv->slid == mad_recv_wc->wc->slid &&
 197                     rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
 198                     rmpp_recv->class_version == mad_hdr->class_version &&
 199                     rmpp_recv->method == mad_hdr->method)
 200                         return rmpp_recv;
 201         }
 202         return NULL;
 203 }
 204
 205 static struct mad_rmpp_recv *
 206 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
 207                   struct ib_mad_recv_wc *mad_recv_wc)
 208 {
 209         struct mad_rmpp_recv *rmpp_recv;
 210         unsigned long flags;
 211
 212         spin_lock_irqsave(&agent->lock, flags);
 213         rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
 214         if (rmpp_recv)
 215                 atomic_inc(&rmpp_recv->refcount);
 216         spin_unlock_irqrestore(&agent->lock, flags);
 217         return rmpp_recv;
 218 }
 219
 220 static struct mad_rmpp_recv *
 221 insert_rmpp_recv(struct ib_mad_agent_private *agent,
 222                  struct mad_rmpp_recv *rmpp_recv)
 223 {
 224         struct mad_rmpp_recv *cur_rmpp_recv;
 225
 226         cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
 227         if (!cur_rmpp_recv)
 228                 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
 229
 230         return cur_rmpp_recv;
 231 }
 232
 233 static int data_offset(u8 mgmt_class)
 234 {
 235         if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
 236                 return offsetof(struct ib_sa_mad, data);
 237         else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 238                  (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
 239                 return offsetof(struct ib_vendor_mad, data);
 240         else
 241                 return offsetof(struct ib_rmpp_mad, data);
 242 }
 243
 244 static void format_ack(struct ib_rmpp_mad *ack,
 245                        struct ib_rmpp_mad *data,
 246                        struct mad_rmpp_recv *rmpp_recv)
 247 {
 248         unsigned long flags;
 249
 250         memcpy(&ack->mad_hdr, &data->mad_hdr,
 251                data_offset(data->mad_hdr.mgmt_class));
 252
 253         ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
 254         ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
 255         ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 256
 257         spin_lock_irqsave(&rmpp_recv->lock, flags);
 258         rmpp_recv->last_ack = rmpp_recv->seg_num;
 259         ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
 260         ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
 261         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 262 }
 263
 264 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
 265                      struct ib_mad_recv_wc *recv_wc)
 266 {
 267         struct ib_mad_send_buf *msg;
 268         struct ib_send_wr *bad_send_wr;
 269         int hdr_len, ret;
 270
 271         hdr_len = sizeof(struct ib_mad_hdr) + sizeof(struct ib_rmpp_hdr);
 272         msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
 273                                  recv_wc->wc->pkey_index, rmpp_recv->ah, 1,
 274                                  hdr_len, sizeof(struct ib_rmpp_mad) - hdr_len,
 275                                  GFP_KERNEL);
 276         if (!msg)
 277                 return;
 278
 279         format_ack((struct ib_rmpp_mad *) msg->mad,
 280                    (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
 281         ret = ib_post_send_mad(&rmpp_recv->agent->agent, &msg->send_wr,
 282                                &bad_send_wr);
 283         if (ret)
 284                 ib_free_send_mad(msg);
 285 }
 286
 287 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
 288 {
 289         struct ib_rmpp_mad *rmpp_mad;
 290
 291         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 292         return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
 293 }
 294
 295 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
 296 {
 297         struct ib_rmpp_mad *rmpp_mad;
 298
 299         rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
 300         return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 301 }
 302
 303 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
 304                                                     struct ib_mad_recv_buf *seg)
 305 {
 306         if (seg->list.next == rmpp_list)
 307                 return NULL;
 308
 309         return container_of(seg->list.next, struct ib_mad_recv_buf, list);
 310 }
 311
 312 static inline int window_size(struct ib_mad_agent_private *agent)
 313 {
 314         return max(agent->qp_info->recv_queue.max_active >> 3, 1);
 315 }
 316
 317 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
 318                                                   int seg_num)
 319 {
 320         struct ib_mad_recv_buf *seg_buf;
 321         int cur_seg_num;
 322
 323         list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
 324                 cur_seg_num = get_seg_num(seg_buf);
 325                 if (seg_num > cur_seg_num)
 326                         return seg_buf;
 327                 if (seg_num == cur_seg_num)
 328                         break;
 329         }
 330         return NULL;
 331 }
 332
 333 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
 334                            struct ib_mad_recv_buf *new_buf)
 335 {
 336         struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
 337
 338         while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
 339                 rmpp_recv->cur_seg_buf = new_buf;
 340                 rmpp_recv->seg_num++;
 341                 new_buf = get_next_seg(rmpp_list, new_buf);
 342         }
 343 }
 344
 345 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
 346 {
 347         struct ib_rmpp_mad *rmpp_mad;
 348         int hdr_size, data_size, pad;
 349
 350         rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
 351
 352         hdr_size = data_offset(rmpp_mad->mad_hdr.mgmt_class);
 353         data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
 354         pad = data_size - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 355         if (pad > data_size || pad < 0)
 356                 pad = 0;
 357
 358         return hdr_size + rmpp_recv->seg_num * data_size - pad;
 359 }
 360
 361 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
 362 {
 363         struct ib_mad_recv_wc *rmpp_wc;
 364
 365         ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
 366         if (rmpp_recv->seg_num > 1)
 367                 cancel_delayed_work(&rmpp_recv->timeout_work);
 368
 369         rmpp_wc = rmpp_recv->rmpp_wc;
 370         rmpp_wc->mad_len = get_mad_len(rmpp_recv);
 371         /* 10 seconds until we can find the packet lifetime */
 372         queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
 373                            &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
 374         return rmpp_wc;
 375 }
 376
 377 void ib_coalesce_recv_mad(struct ib_mad_recv_wc *mad_recv_wc, void *buf)
 378 {
 379         struct ib_mad_recv_buf *seg_buf;
 380         struct ib_rmpp_mad *rmpp_mad;
 381         void *data;
 382         int size, len, offset;
 383         u8 flags;
 384
 385         len = mad_recv_wc->mad_len;
 386         if (len <= sizeof(struct ib_mad)) {
 387                 memcpy(buf, mad_recv_wc->recv_buf.mad, len);
 388                 return;
 389         }
 390
 391         offset = data_offset(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
 392
 393         list_for_each_entry(seg_buf, &mad_recv_wc->rmpp_list, list) {
 394                 rmpp_mad = (struct ib_rmpp_mad *)seg_buf->mad;
 395                 flags = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr);
 396
 397                 if (flags & IB_MGMT_RMPP_FLAG_FIRST) {
 398                         data = rmpp_mad;
 399                         size = sizeof(*rmpp_mad);
 400                 } else {
 401                         data = (void *) rmpp_mad + offset;
 402                         if (flags & IB_MGMT_RMPP_FLAG_LAST)
 403                                 size = len;
 404                         else
 405                                 size = sizeof(*rmpp_mad) - offset;
 406                 }
 407
 408                 memcpy(buf, data, size);
 409                 len -= size;
 410                 buf += size;
 411         }
 412 }
 413 EXPORT_SYMBOL(ib_coalesce_recv_mad);
 414
 415 static struct ib_mad_recv_wc *
 416 continue_rmpp(struct ib_mad_agent_private *agent,
 417               struct ib_mad_recv_wc *mad_recv_wc)
 418 {
 419         struct mad_rmpp_recv *rmpp_recv;
 420         struct ib_mad_recv_buf *prev_buf;
 421         struct ib_mad_recv_wc *done_wc;
 422         int seg_num;
 423         unsigned long flags;
 424
 425         rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
 426         if (!rmpp_recv)
 427                 goto drop1;
 428
 429         seg_num = get_seg_num(&mad_recv_wc->recv_buf);
 430
 431         spin_lock_irqsave(&rmpp_recv->lock, flags);
 432         if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
 433             (seg_num > rmpp_recv->newwin))
 434                 goto drop3;
 435
 436         if ((seg_num <= rmpp_recv->last_ack) ||
 437             (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
 438                 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 439                 ack_recv(rmpp_recv, mad_recv_wc);
 440                 goto drop2;
 441         }
 442
 443         prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
 444         if (!prev_buf)
 445                 goto drop3;
 446
 447         done_wc = NULL;
 448         list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
 449         if (rmpp_recv->cur_seg_buf == prev_buf) {
 450                 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
 451                 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
 452                         rmpp_recv->state = RMPP_STATE_COMPLETE;
 453                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 454                         done_wc = complete_rmpp(rmpp_recv);
 455                         goto out;
 456                 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
 457                         rmpp_recv->newwin += window_size(agent);
 458                         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 459                         ack_recv(rmpp_recv, mad_recv_wc);
 460                         goto out;
 461                 }
 462         }
 463         spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 464 out:
 465         deref_rmpp_recv(rmpp_recv);
 466         return done_wc;
 467
 468 drop3:  spin_unlock_irqrestore(&rmpp_recv->lock, flags);
 469 drop2:  deref_rmpp_recv(rmpp_recv);
 470 drop1:  ib_free_recv_mad(mad_recv_wc);
 471         return NULL;
 472 }
 473
 474 static struct ib_mad_recv_wc *
 475 start_rmpp(struct ib_mad_agent_private *agent,
 476            struct ib_mad_recv_wc *mad_recv_wc)
 477 {
 478         struct mad_rmpp_recv *rmpp_recv;
 479         unsigned long flags;
 480
 481         rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
 482         if (!rmpp_recv) {
 483                 ib_free_recv_mad(mad_recv_wc);
 484                 return NULL;
 485         }
 486
 487         spin_lock_irqsave(&agent->lock, flags);
 488         if (insert_rmpp_recv(agent, rmpp_recv)) {
 489                 spin_unlock_irqrestore(&agent->lock, flags);
 490                 /* duplicate first MAD */
 491                 destroy_rmpp_recv(rmpp_recv);
 492                 return continue_rmpp(agent, mad_recv_wc);
 493         }
 494         atomic_inc(&rmpp_recv->refcount);
 495
 496         if (get_last_flag(&mad_recv_wc->recv_buf)) {
 497                 rmpp_recv->state = RMPP_STATE_COMPLETE;
 498                 spin_unlock_irqrestore(&agent->lock, flags);
 499                 complete_rmpp(rmpp_recv);
 500         } else {
 501                 spin_unlock_irqrestore(&agent->lock, flags);
 502                 /* 40 seconds until we can find the packet lifetimes */
 503                 queue_delayed_work(agent->qp_info->port_priv->wq,
 504                                    &rmpp_recv->timeout_work,
 505                                    msecs_to_jiffies(40000));
 506                 rmpp_recv->newwin += window_size(agent);
 507                 ack_recv(rmpp_recv, mad_recv_wc);
 508                 mad_recv_wc = NULL;
 509         }
 510         deref_rmpp_recv(rmpp_recv);
 511         return mad_recv_wc;
 512 }
 513
 514 static inline u64 get_seg_addr(struct ib_mad_send_wr_private *mad_send_wr)
 515 {
 516         return mad_send_wr->sg_list[0].addr + mad_send_wr->data_offset +
 517                (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset) *
 518                (mad_send_wr->seg_num - 1);
 519 }
 520
 521 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
 522 {
 523         struct ib_rmpp_mad *rmpp_mad;
 524         int timeout;
 525
 526         rmpp_mad = (struct ib_rmpp_mad *)mad_send_wr->send_wr.wr.ud.mad_hdr;
 527         ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
 528         rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(mad_send_wr->seg_num);
 529
 530         if (mad_send_wr->seg_num == 1) {
 531                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
 532                 rmpp_mad->rmpp_hdr.paylen_newwin =
 533                         cpu_to_be32(mad_send_wr->total_seg *
 534                                     (sizeof(struct ib_rmpp_mad) -
 535                                        offsetof(struct ib_rmpp_mad, data)));
 536                 mad_send_wr->sg_list[0].length = sizeof(struct ib_rmpp_mad);
 537         } else {
 538                 mad_send_wr->send_wr.num_sge = 2;
 539                 mad_send_wr->sg_list[0].length = mad_send_wr->data_offset;
 540                 mad_send_wr->sg_list[1].addr = get_seg_addr(mad_send_wr);
 541                 mad_send_wr->sg_list[1].length = sizeof(struct ib_rmpp_mad) -
 542                                                  mad_send_wr->data_offset;
 543                 mad_send_wr->sg_list[1].lkey = mad_send_wr->sg_list[0].lkey;
 544         }
 545
 546         if (mad_send_wr->seg_num == mad_send_wr->total_seg) {
 547                 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
 548                 rmpp_mad->rmpp_hdr.paylen_newwin =
 549                         cpu_to_be32(sizeof(struct ib_rmpp_mad) -
 550                                     offsetof(struct ib_rmpp_mad, data) -
 551                                     mad_send_wr->pad);
 552         }
 553
 554         /* 2 seconds for an ACK until we can find the packet lifetime */
 555         timeout = mad_send_wr->send_wr.wr.ud.timeout_ms;
 556         if (!timeout || timeout > 2000)
 557                 mad_send_wr->timeout = msecs_to_jiffies(2000);
 558         mad_send_wr->seg_num++;
 559         return ib_send_mad(mad_send_wr);
 560 }
 561
 562 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
 563                              struct ib_mad_recv_wc *mad_recv_wc)
 564 {
 565         struct ib_mad_send_wr_private *mad_send_wr;
 566         struct ib_rmpp_mad *rmpp_mad;
 567         unsigned long flags;
 568         int seg_num, newwin, ret;
 569
 570         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 571         if (rmpp_mad->rmpp_hdr.rmpp_status)
 572                 return;
 573
 574         seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
 575         newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 576
 577         spin_lock_irqsave(&agent->lock, flags);
 578         mad_send_wr = ib_find_send_mad(agent, rmpp_mad->mad_hdr.tid);
 579         if (!mad_send_wr)
 580                 goto out;       /* Unmatched ACK */
 581
 582         if ((mad_send_wr->last_ack == mad_send_wr->total_seg) ||
 583             (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
 584                 goto out;       /* Send is already done */
 585
 586         if (seg_num > mad_send_wr->total_seg)
 587                 goto out;       /* Bad ACK */
 588
 589         if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
 590                 goto out;       /* Old ACK */
 591
 592         if (seg_num > mad_send_wr->last_ack) {
 593                 mad_send_wr->last_ack = seg_num;
 594                 mad_send_wr->retries = mad_send_wr->send_wr.wr.ud.retries;
 595         }
 596         mad_send_wr->newwin = newwin;
 597         if (mad_send_wr->last_ack == mad_send_wr->total_seg) {
 598                 /* If no response is expected, the ACK completes the send */
 599                 if (!mad_send_wr->send_wr.wr.ud.timeout_ms) {
 600                         struct ib_mad_send_wc wc;
 601
 602                         ib_mark_mad_done(mad_send_wr);
 603                         spin_unlock_irqrestore(&agent->lock, flags);
 604
 605                         wc.status = IB_WC_SUCCESS;
 606                         wc.vendor_err = 0;
 607                         wc.wr_id = mad_send_wr->wr_id;
 608                         ib_mad_complete_send_wr(mad_send_wr, &wc);
 609                         return;
 610                 }
 611                 if (mad_send_wr->refcount == 1)
 612                         ib_reset_mad_timeout(mad_send_wr, mad_send_wr->
 613                                              send_wr.wr.ud.timeout_ms);
 614         } else if (mad_send_wr->refcount == 1 &&
 615                    mad_send_wr->seg_num < mad_send_wr->newwin &&
 616                    mad_send_wr->seg_num <= mad_send_wr->total_seg) {
 617                 /* Send failure will just result in a timeout/retry */
 618                 ret = send_next_seg(mad_send_wr);
 619                 if (ret)
 620                         goto out;
 621
 622                 mad_send_wr->refcount++;
 623                 list_del(&mad_send_wr->agent_list);
 624                 list_add_tail(&mad_send_wr->agent_list,
 625                               &mad_send_wr->mad_agent_priv->send_list);
 626         }
 627 out:
 628         spin_unlock_irqrestore(&agent->lock, flags);
 629 }
 630
 631 struct ib_mad_recv_wc *
 632 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
 633                         struct ib_mad_recv_wc *mad_recv_wc)
 634 {
 635         struct ib_rmpp_mad *rmpp_mad;
 636
 637         rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
 638         if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
 639                 return mad_recv_wc;
 640
 641         if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION)
 642                 goto out;
 643
 644         switch (rmpp_mad->rmpp_hdr.rmpp_type) {
 645         case IB_MGMT_RMPP_TYPE_DATA:
 646                 if (rmpp_mad->rmpp_hdr.seg_num == __constant_htonl(1))
 647                         return start_rmpp(agent, mad_recv_wc);
 648                 else
 649                         return continue_rmpp(agent, mad_recv_wc);
 650         case IB_MGMT_RMPP_TYPE_ACK:
 651                 process_rmpp_ack(agent, mad_recv_wc);
 652                 break;
 653         case IB_MGMT_RMPP_TYPE_STOP:
 654         case IB_MGMT_RMPP_TYPE_ABORT:
 655                 /* TODO: process_rmpp_nack(agent, mad_recv_wc); */
 656                 break;
 657         default:
 658                 break;
 659         }
 660 out:
 661         ib_free_recv_mad(mad_recv_wc);
 662         return NULL;
 663 }
 664
 665 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
 666 {
 667         struct ib_rmpp_mad *rmpp_mad;
 668         int i, total_len, ret;
 669
 670         rmpp_mad = (struct ib_rmpp_mad *)mad_send_wr->send_wr.wr.ud.mad_hdr;
 671         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 672               IB_MGMT_RMPP_FLAG_ACTIVE))
 673                 return IB_RMPP_RESULT_UNHANDLED;
 674
 675         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
 676                 return IB_RMPP_RESULT_INTERNAL;
 677
 678         if (mad_send_wr->send_wr.num_sge > 1)
 679                 return -EINVAL;         /* TODO: support num_sge > 1 */
 680
 681         mad_send_wr->seg_num = 1;
 682         mad_send_wr->newwin = 1;
 683         mad_send_wr->data_offset = data_offset(rmpp_mad->mad_hdr.mgmt_class);
 684
 685         total_len = 0;
 686         for (i = 0; i < mad_send_wr->send_wr.num_sge; i++)
 687                 total_len += mad_send_wr->send_wr.sg_list[i].length;
 688
 689         mad_send_wr->total_seg = (total_len - mad_send_wr->data_offset) /
 690                         (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset);
 691         mad_send_wr->pad = total_len - offsetof(struct ib_rmpp_mad, data) -
 692                            be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
 693
 694         /* We need to wait for the final ACK even if there isn't a response */
 695         mad_send_wr->refcount += (mad_send_wr->timeout == 0);
 696         ret = send_next_seg(mad_send_wr);
 697         if (!ret)
 698                 return IB_RMPP_RESULT_CONSUMED;
 699         return ret;
 700 }
 701
 702 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
 703                             struct ib_mad_send_wc *mad_send_wc)
 704 {
 705         struct ib_rmpp_mad *rmpp_mad;
 706         struct ib_mad_send_buf *msg;
 707         int ret;
 708
 709         rmpp_mad = (struct ib_rmpp_mad *)mad_send_wr->send_wr.wr.ud.mad_hdr;
 710         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 711               IB_MGMT_RMPP_FLAG_ACTIVE))
 712                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 713
 714         if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
 715                 msg = (struct ib_mad_send_buf *) (unsigned long)
 716                       mad_send_wc->wr_id;
 717                 ib_free_send_mad(msg);
 718                 return IB_RMPP_RESULT_INTERNAL;  /* ACK, STOP, or ABORT */
 719         }
 720
 721         if (mad_send_wc->status != IB_WC_SUCCESS ||
 722             mad_send_wr->status != IB_WC_SUCCESS)
 723                 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
 724
 725         if (!mad_send_wr->timeout)
 726                 return IB_RMPP_RESULT_PROCESSED; /* Response received */
 727
 728         if (mad_send_wr->last_ack == mad_send_wr->total_seg) {
 729                 mad_send_wr->timeout =
 730                         msecs_to_jiffies(mad_send_wr->send_wr.wr.ud.timeout_ms);
 731                 return IB_RMPP_RESULT_PROCESSED; /* Send done */
 732         }
 733
 734         if (mad_send_wr->seg_num > mad_send_wr->newwin ||
 735             mad_send_wr->seg_num > mad_send_wr->total_seg)
 736                 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
 737
 738         ret = send_next_seg(mad_send_wr);
 739         if (ret) {
 740                 mad_send_wc->status = IB_WC_GENERAL_ERR;
 741                 return IB_RMPP_RESULT_PROCESSED;
 742         }
 743         return IB_RMPP_RESULT_CONSUMED;
 744 }
 745
 746 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
 747 {
 748         struct ib_rmpp_mad *rmpp_mad;
 749         int ret;
 750
 751         rmpp_mad = (struct ib_rmpp_mad *)mad_send_wr->send_wr.wr.ud.mad_hdr;
 752         if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
 753               IB_MGMT_RMPP_FLAG_ACTIVE))
 754                 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
 755
 756         if (mad_send_wr->last_ack == mad_send_wr->total_seg)
 757                 return IB_RMPP_RESULT_PROCESSED;
 758
 759         mad_send_wr->seg_num = mad_send_wr->last_ack + 1;
 760         ret = send_next_seg(mad_send_wr);
 761         if (ret)
 762                 return IB_RMPP_RESULT_PROCESSED;
 763
 764         return IB_RMPP_RESULT_CONSUMED;
 765 }