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