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