sys/ofed/drivers/infiniband/ulp/ipoib/ipoib_cm.c

   1 /*
   2  * Copyright (c) 2006 Mellanox Technologies. All rights reserved
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include "ipoib.h"
  34
  35 #ifdef CONFIG_INFINIBAND_IPOIB_CM
  36
  37 #include <netinet/ip.h>
  38 #include <netinet/ip_icmp.h>
  39 #include <netinet/icmp6.h>
  40
  41 #include <rdma/ib_cm.h>
  42 #include <rdma/ib_cache.h>
  43 #include <linux/delay.h>
  44
  45 int ipoib_max_conn_qp = 128;
  46
  47 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
  48 MODULE_PARM_DESC(max_nonsrq_conn_qp,
  49                  "Max number of connected-mode QPs per interface "
  50                  "(applied only if shared receive queue is not available)");
  51
  52 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  53 static int data_debug_level;
  54
  55 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  56 MODULE_PARM_DESC(cm_data_debug_level,
  57                  "Enable data path debug tracing for connected mode if > 0");
  58 #endif
  59
  60 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  61
  62 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
  63 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
  64 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
  65 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
  66
  67 static struct ib_qp_attr ipoib_cm_err_attr = {
  68         .qp_state = IB_QPS_ERR
  69 };
  70
  71 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
  72
  73 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  74         .wr_id = IPOIB_CM_RX_DRAIN_WRID,
  75         .opcode = IB_WR_SEND,
  76 };
  77
  78 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  79                                struct ib_cm_event *event);
  80
  81 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req)
  82 {
  83
  84         ipoib_dma_unmap_rx(priv, (struct ipoib_rx_buf *)rx_req);
  85
  86 }
  87
  88 static int ipoib_cm_post_receive_srq(struct ipoib_dev_priv *priv, int id)
  89 {
  90         struct ib_recv_wr *bad_wr;
  91         struct ipoib_rx_buf *rx_req;
  92         struct mbuf *m;
  93         int ret;
  94         int i;
  95
  96         rx_req = (struct ipoib_rx_buf *)&priv->cm.srq_ring[id];
  97         for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
  98                 priv->cm.rx_sge[i].addr = rx_req->mapping[i];
  99                 priv->cm.rx_sge[i].length = m->m_len;
 100         }
 101
 102         priv->cm.rx_wr.num_sge = i;
 103         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 104
 105         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
 106         if (unlikely(ret)) {
 107                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
 108                 ipoib_dma_unmap_rx(priv, rx_req);
 109                 m_freem(priv->cm.srq_ring[id].mb);
 110                 priv->cm.srq_ring[id].mb = NULL;
 111         }
 112
 113         return ret;
 114 }
 115
 116 static int ipoib_cm_post_receive_nonsrq(struct ipoib_dev_priv *priv,
 117                                         struct ipoib_cm_rx *rx,
 118                                         struct ib_recv_wr *wr,
 119                                         struct ib_sge *sge, int id)
 120 {
 121         struct ipoib_rx_buf *rx_req;
 122         struct ib_recv_wr *bad_wr;
 123         struct mbuf *m;
 124         int ret;
 125         int i;
 126
 127         rx_req = (struct ipoib_rx_buf *)&rx->rx_ring[id];
 128         for (m = rx_req->mb, i = 0; m != NULL; m = m->m_next, i++) {
 129                 sge[i].addr = rx_req->mapping[i];
 130                 sge[i].length = m->m_len;
 131         }
 132
 133         wr->num_sge = i;
 134         wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 135
 136         ret = ib_post_recv(rx->qp, wr, &bad_wr);
 137         if (unlikely(ret)) {
 138                 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
 139                 ipoib_dma_unmap_rx(priv, rx_req);
 140                 m_freem(rx->rx_ring[id].mb);
 141                 rx->rx_ring[id].mb = NULL;
 142         }
 143
 144         return ret;
 145 }
 146
 147 static struct mbuf *
 148 ipoib_cm_alloc_rx_mb(struct ipoib_dev_priv *priv, struct ipoib_cm_rx_buf *rx_req)
 149 {
 150         return ipoib_alloc_map_mb(priv, (struct ipoib_rx_buf *)rx_req,
 151             priv->cm.max_cm_mtu);
 152 }
 153
 154 static void ipoib_cm_free_rx_ring(struct ipoib_dev_priv *priv,
 155                                   struct ipoib_cm_rx_buf *rx_ring)
 156 {
 157         int i;
 158
 159         for (i = 0; i < ipoib_recvq_size; ++i)
 160                 if (rx_ring[i].mb) {
 161                         ipoib_cm_dma_unmap_rx(priv, &rx_ring[i]);
 162                         m_freem(rx_ring[i].mb);
 163                 }
 164
 165         kfree(rx_ring);
 166 }
 167
 168 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 169 {
 170         struct ib_send_wr *bad_wr;
 171         struct ipoib_cm_rx *p;
 172
 173         /* We only reserved 1 extra slot in CQ for drain WRs, so
 174          * make sure we have at most 1 outstanding WR. */
 175         if (list_empty(&priv->cm.rx_flush_list) ||
 176             !list_empty(&priv->cm.rx_drain_list))
 177                 return;
 178
 179         /*
 180          * QPs on flush list are error state.  This way, a "flush
 181          * error" WC will be immediately generated for each WR we post.
 182          */
 183         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 184         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
 185                 ipoib_warn(priv, "failed to post drain wr\n");
 186
 187         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 188 }
 189
 190 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 191 {
 192         struct ipoib_cm_rx *p = ctx;
 193         struct ipoib_dev_priv *priv = p->priv;
 194         unsigned long flags;
 195
 196         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 197                 return;
 198
 199         spin_lock_irqsave(&priv->lock, flags);
 200         list_move(&p->list, &priv->cm.rx_flush_list);
 201         p->state = IPOIB_CM_RX_FLUSH;
 202         ipoib_cm_start_rx_drain(priv);
 203         spin_unlock_irqrestore(&priv->lock, flags);
 204 }
 205
 206 static struct ib_qp *ipoib_cm_create_rx_qp(struct ipoib_dev_priv *priv,
 207                                            struct ipoib_cm_rx *p)
 208 {
 209         struct ib_qp_init_attr attr = {
 210                 .event_handler = ipoib_cm_rx_event_handler,
 211                 .send_cq = priv->recv_cq, /* For drain WR */
 212                 .recv_cq = priv->recv_cq,
 213                 .srq = priv->cm.srq,
 214                 .cap.max_send_wr = 1, /* For drain WR */
 215                 .cap.max_send_sge = 1,
 216                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 217                 .qp_type = IB_QPT_RC,
 218                 .qp_context = p,
 219         };
 220
 221         if (!ipoib_cm_has_srq(priv)) {
 222                 attr.cap.max_recv_wr  = ipoib_recvq_size;
 223                 attr.cap.max_recv_sge = priv->cm.num_frags;
 224         }
 225
 226         return ib_create_qp(priv->pd, &attr);
 227 }
 228
 229 static int ipoib_cm_modify_rx_qp(struct ipoib_dev_priv *priv,
 230                                  struct ib_cm_id *cm_id, struct ib_qp *qp,
 231                                  unsigned psn)
 232 {
 233         struct ib_qp_attr qp_attr;
 234         int qp_attr_mask, ret;
 235
 236         qp_attr.qp_state = IB_QPS_INIT;
 237         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 238         if (ret) {
 239                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 240                 return ret;
 241         }
 242         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 243         if (ret) {
 244                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 245                 return ret;
 246         }
 247         qp_attr.qp_state = IB_QPS_RTR;
 248         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 249         if (ret) {
 250                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 251                 return ret;
 252         }
 253         qp_attr.rq_psn = psn;
 254         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 255         if (ret) {
 256                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 257                 return ret;
 258         }
 259
 260         /*
 261          * Current Mellanox HCA firmware won't generate completions
 262          * with error for drain WRs unless the QP has been moved to
 263          * RTS first. This work-around leaves a window where a QP has
 264          * moved to error asynchronously, but this will eventually get
 265          * fixed in firmware, so let's not error out if modify QP
 266          * fails.
 267          */
 268         qp_attr.qp_state = IB_QPS_RTS;
 269         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 270         if (ret) {
 271                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 272                 return 0;
 273         }
 274         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 275         if (ret) {
 276                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 277                 return 0;
 278         }
 279
 280         return 0;
 281 }
 282
 283 static void ipoib_cm_init_rx_wr(struct ipoib_dev_priv *priv,
 284                                 struct ib_recv_wr *wr,
 285                                 struct ib_sge *sge)
 286 {
 287         int i;
 288
 289         for (i = 0; i < IPOIB_CM_RX_SG; i++)
 290                 sge[i].lkey = priv->mr->lkey;
 291
 292         wr->next    = NULL;
 293         wr->sg_list = sge;
 294         wr->num_sge = 1;
 295 }
 296
 297 static int ipoib_cm_nonsrq_init_rx(struct ipoib_dev_priv *priv,
 298     struct ib_cm_id *cm_id, struct ipoib_cm_rx *rx)
 299 {
 300         struct {
 301                 struct ib_recv_wr wr;
 302                 struct ib_sge sge[IPOIB_CM_RX_SG];
 303         } *t;
 304         int ret;
 305         int i;
 306
 307         rx->rx_ring = kzalloc(ipoib_recvq_size * sizeof *rx->rx_ring, GFP_KERNEL);
 308         if (!rx->rx_ring) {
 309                 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
 310                        priv->ca->name, ipoib_recvq_size);
 311                 return -ENOMEM;
 312         }
 313
 314         memset(rx->rx_ring, 0, ipoib_recvq_size * sizeof *rx->rx_ring);
 315
 316         t = kmalloc(sizeof *t, GFP_KERNEL);
 317         if (!t) {
 318                 ret = -ENOMEM;
 319                 goto err_free;
 320         }
 321
 322         ipoib_cm_init_rx_wr(priv, &t->wr, t->sge);
 323
 324         spin_lock_irq(&priv->lock);
 325
 326         if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
 327                 spin_unlock_irq(&priv->lock);
 328                 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
 329                 ret = -EINVAL;
 330                 goto err_free;
 331         } else
 332                 ++priv->cm.nonsrq_conn_qp;
 333
 334         spin_unlock_irq(&priv->lock);
 335
 336         for (i = 0; i < ipoib_recvq_size; ++i) {
 337                 if (!ipoib_cm_alloc_rx_mb(priv, &rx->rx_ring[i])) {
 338                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 339                                 ret = -ENOMEM;
 340                                 goto err_count;
 341                 }
 342                 ret = ipoib_cm_post_receive_nonsrq(priv, rx, &t->wr, t->sge, i);
 343                 if (ret) {
 344                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
 345                                    "failed for buf %d\n", i);
 346                         ret = -EIO;
 347                         goto err_count;
 348                 }
 349         }
 350
 351         rx->recv_count = ipoib_recvq_size;
 352
 353         kfree(t);
 354
 355         return 0;
 356
 357 err_count:
 358         spin_lock_irq(&priv->lock);
 359         --priv->cm.nonsrq_conn_qp;
 360         spin_unlock_irq(&priv->lock);
 361
 362 err_free:
 363         kfree(t);
 364         ipoib_cm_free_rx_ring(priv, rx->rx_ring);
 365
 366         return ret;
 367 }
 368
 369 static int ipoib_cm_send_rep(struct ipoib_dev_priv *priv, struct ib_cm_id *cm_id,
 370                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 371                              unsigned psn)
 372 {
 373         struct ipoib_cm_data data = {};
 374         struct ib_cm_rep_param rep = {};
 375
 376         data.qpn = cpu_to_be32(priv->qp->qp_num);
 377         data.mtu = cpu_to_be32(priv->cm.max_cm_mtu);
 378
 379         rep.private_data = &data;
 380         rep.private_data_len = sizeof data;
 381         rep.flow_control = 0;
 382         rep.rnr_retry_count = req->rnr_retry_count;
 383         rep.srq = ipoib_cm_has_srq(priv);
 384         rep.qp_num = qp->qp_num;
 385         rep.starting_psn = psn;
 386         return ib_send_cm_rep(cm_id, &rep);
 387 }
 388
 389 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 390 {
 391         struct ipoib_dev_priv *priv = cm_id->context;
 392         struct ipoib_cm_rx *p;
 393         unsigned psn;
 394         int ret;
 395
 396         ipoib_dbg(priv, "REQ arrived\n");
 397         p = kzalloc(sizeof *p, GFP_KERNEL);
 398         if (!p)
 399                 return -ENOMEM;
 400         p->priv = priv;
 401         p->id = cm_id;
 402         cm_id->context = p;
 403         p->state = IPOIB_CM_RX_LIVE;
 404         p->jiffies = jiffies;
 405         INIT_LIST_HEAD(&p->list);
 406
 407         p->qp = ipoib_cm_create_rx_qp(priv, p);
 408         if (IS_ERR(p->qp)) {
 409                 ret = PTR_ERR(p->qp);
 410                 goto err_qp;
 411         }
 412
 413         psn = random() & 0xffffff;
 414         ret = ipoib_cm_modify_rx_qp(priv, cm_id, p->qp, psn);
 415         if (ret)
 416                 goto err_modify;
 417
 418         if (!ipoib_cm_has_srq(priv)) {
 419                 ret = ipoib_cm_nonsrq_init_rx(priv, cm_id, p);
 420                 if (ret)
 421                         goto err_modify;
 422         }
 423
 424         spin_lock_irq(&priv->lock);
 425         queue_delayed_work(ipoib_workqueue,
 426                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 427         /* Add this entry to passive ids list head, but do not re-add it
 428          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 429         p->jiffies = jiffies;
 430         if (p->state == IPOIB_CM_RX_LIVE)
 431                 list_move(&p->list, &priv->cm.passive_ids);
 432         spin_unlock_irq(&priv->lock);
 433
 434         ret = ipoib_cm_send_rep(priv, cm_id, p->qp, &event->param.req_rcvd, psn);
 435         if (ret) {
 436                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 437                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 438                         ipoib_warn(priv, "unable to move qp to error state\n");
 439         }
 440         return 0;
 441
 442 err_modify:
 443         ib_destroy_qp(p->qp);
 444 err_qp:
 445         kfree(p);
 446         return ret;
 447 }
 448
 449 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 450                                struct ib_cm_event *event)
 451 {
 452         struct ipoib_cm_rx *p;
 453         struct ipoib_dev_priv *priv;
 454
 455         switch (event->event) {
 456         case IB_CM_REQ_RECEIVED:
 457                 return ipoib_cm_req_handler(cm_id, event);
 458         case IB_CM_DREQ_RECEIVED:
 459                 p = cm_id->context;
 460                 ib_send_cm_drep(cm_id, NULL, 0);
 461                 /* Fall through */
 462         case IB_CM_REJ_RECEIVED:
 463                 p = cm_id->context;
 464                 priv = p->priv;
 465                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 466                         ipoib_warn(priv, "unable to move qp to error state\n");
 467                 /* Fall through */
 468         default:
 469                 return 0;
 470         }
 471 }
 472
 473 void ipoib_cm_handle_rx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 474 {
 475         struct ipoib_cm_rx_buf saverx;
 476         struct ipoib_cm_rx_buf *rx_ring;
 477         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
 478         struct ifnet *dev = priv->dev;
 479         struct mbuf *mb, *newmb;
 480         struct ipoib_cm_rx *p;
 481         int has_srq;
 482         u_short proto;
 483
 484         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 485                        wr_id, wc->status);
 486
 487         if (unlikely(wr_id >= ipoib_recvq_size)) {
 488                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
 489                         spin_lock(&priv->lock);
 490                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 491                         ipoib_cm_start_rx_drain(priv);
 492                         if (priv->cm.id != NULL)
 493                                 queue_work(ipoib_workqueue,
 494                                     &priv->cm.rx_reap_task);
 495                         spin_unlock(&priv->lock);
 496                 } else
 497                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 498                                    wr_id, ipoib_recvq_size);
 499                 return;
 500         }
 501
 502         p = wc->qp->qp_context;
 503
 504         has_srq = ipoib_cm_has_srq(priv);
 505         rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
 506
 507         mb = rx_ring[wr_id].mb;
 508
 509         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 510                 ipoib_dbg(priv, "cm recv error "
 511                            "(status=%d, wrid=%d vend_err %x)\n",
 512                            wc->status, wr_id, wc->vendor_err);
 513                 ++dev->if_ierrors;
 514                 if (has_srq)
 515                         goto repost;
 516                 else {
 517                         if (!--p->recv_count) {
 518                                 spin_lock(&priv->lock);
 519                                 list_move(&p->list, &priv->cm.rx_reap_list);
 520                                 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
 521                                 spin_unlock(&priv->lock);
 522                         }
 523                         return;
 524                 }
 525         }
 526
 527         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
 528                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 529                         p->jiffies = jiffies;
 530                         /* Move this entry to list head, but do not re-add it
 531                          * if it has been moved out of list. */
 532                         if (p->state == IPOIB_CM_RX_LIVE)
 533                                 list_move(&p->list, &priv->cm.passive_ids);
 534                 }
 535         }
 536
 537         memcpy(&saverx, &rx_ring[wr_id], sizeof(saverx));
 538         newmb = ipoib_cm_alloc_rx_mb(priv, &rx_ring[wr_id]);
 539         if (unlikely(!newmb)) {
 540                 /*
 541                  * If we can't allocate a new RX buffer, dump
 542                  * this packet and reuse the old buffer.
 543                  */
 544                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 545                 ++dev->if_ierrors;
 546                 memcpy(&rx_ring[wr_id], &saverx, sizeof(saverx));
 547                 goto repost;
 548         }
 549
 550         ipoib_cm_dma_unmap_rx(priv, &saverx);
 551
 552         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 553                        wc->byte_len, wc->slid);
 554
 555         ipoib_dma_mb(priv, mb, wc->byte_len);
 556
 557         ++dev->if_ipackets;
 558         dev->if_ibytes += mb->m_pkthdr.len;
 559
 560         mb->m_pkthdr.rcvif = dev;
 561         proto = *mtod(mb, uint16_t *);
 562         m_adj(mb, IPOIB_ENCAP_LEN);
 563
 564         IPOIB_MTAP_PROTO(dev, mb, proto);
 565         ipoib_demux(dev, mb, ntohs(proto));
 566
 567 repost:
 568         if (has_srq) {
 569                 if (unlikely(ipoib_cm_post_receive_srq(priv, wr_id)))
 570                         ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
 571                                    "for buf %d\n", wr_id);
 572         } else {
 573                 if (unlikely(ipoib_cm_post_receive_nonsrq(priv, p,
 574                                                           &priv->cm.rx_wr,
 575                                                           priv->cm.rx_sge,
 576                                                           wr_id))) {
 577                         --p->recv_count;
 578                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
 579                                    "for buf %d\n", wr_id);
 580                 }
 581         }
 582 }
 583
 584 static inline int post_send(struct ipoib_dev_priv *priv,
 585                             struct ipoib_cm_tx *tx,
 586                             struct ipoib_cm_tx_buf *tx_req,
 587                             unsigned int wr_id)
 588 {
 589         struct ib_send_wr *bad_wr;
 590         struct mbuf *mb = tx_req->mb;
 591         u64 *mapping = tx_req->mapping;
 592         struct mbuf *m;
 593         int i;
 594
 595         for (m = mb, i = 0; m != NULL; m = m->m_next, i++) {
 596                 priv->tx_sge[i].addr = mapping[i];
 597                 priv->tx_sge[i].length = m->m_len;
 598         }
 599         priv->tx_wr.num_sge = i;
 600         priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
 601         priv->tx_wr.opcode = IB_WR_SEND;
 602
 603         return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
 604 }
 605
 606 void ipoib_cm_send(struct ipoib_dev_priv *priv, struct mbuf *mb, struct ipoib_cm_tx *tx)
 607 {
 608         struct ipoib_cm_tx_buf *tx_req;
 609         struct ifnet *dev = priv->dev;
 610
 611         if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
 612                 while (ipoib_poll_tx(priv)); /* nothing */
 613
 614         m_adj(mb, sizeof(struct ipoib_pseudoheader));
 615         if (unlikely(mb->m_pkthdr.len > tx->mtu)) {
 616                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 617                            mb->m_pkthdr.len, tx->mtu);
 618                 ++dev->if_oerrors;
 619                 ipoib_cm_mb_too_long(priv, mb, IPOIB_CM_MTU(tx->mtu));
 620                 return;
 621         }
 622
 623         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 624                        tx->tx_head, mb->m_pkthdr.len, tx->qp->qp_num);
 625
 626
 627         /*
 628          * We put the mb into the tx_ring _before_ we call post_send()
 629          * because it's entirely possible that the completion handler will
 630          * run before we execute anything after the post_send().  That
 631          * means we have to make sure everything is properly recorded and
 632          * our state is consistent before we call post_send().
 633          */
 634         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 635         tx_req->mb = mb;
 636         if (unlikely(ipoib_dma_map_tx(priv->ca, (struct ipoib_tx_buf *)tx_req,
 637             priv->cm.num_frags))) {
 638                 ++dev->if_oerrors;
 639                 if (tx_req->mb)
 640                         m_freem(tx_req->mb);
 641                 return;
 642         }
 643
 644         if (unlikely(post_send(priv, tx, tx_req, tx->tx_head & (ipoib_sendq_size - 1)))) {
 645                 ipoib_warn(priv, "post_send failed\n");
 646                 ++dev->if_oerrors;
 647                 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req);
 648                 m_freem(mb);
 649         } else {
 650                 ++tx->tx_head;
 651
 652                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 653                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 654                                   tx->qp->qp_num);
 655                         if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
 656                                 ipoib_warn(priv, "request notify on send CQ failed\n");
 657                         dev->if_drv_flags |= IFF_DRV_OACTIVE;
 658                 }
 659         }
 660
 661 }
 662
 663 void ipoib_cm_handle_tx_wc(struct ipoib_dev_priv *priv, struct ib_wc *wc)
 664 {
 665         struct ipoib_cm_tx *tx = wc->qp->qp_context;
 666         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 667         struct ifnet *dev = priv->dev;
 668         struct ipoib_cm_tx_buf *tx_req;
 669
 670         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 671                        wr_id, wc->status);
 672
 673         if (unlikely(wr_id >= ipoib_sendq_size)) {
 674                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 675                            wr_id, ipoib_sendq_size);
 676                 return;
 677         }
 678
 679         tx_req = &tx->tx_ring[wr_id];
 680
 681         ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req);
 682
 683         /* FIXME: is this right? Shouldn't we only increment on success? */
 684         ++dev->if_opackets;
 685         dev->if_obytes += tx_req->mb->m_pkthdr.len;
 686
 687         m_freem(tx_req->mb);
 688
 689         ++tx->tx_tail;
 690         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 691             (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 &&
 692             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 693                 dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 694
 695         if (wc->status != IB_WC_SUCCESS &&
 696             wc->status != IB_WC_WR_FLUSH_ERR) {
 697                 struct ipoib_path *path;
 698
 699                 ipoib_dbg(priv, "failed cm send event "
 700                            "(status=%d, wrid=%d vend_err %x)\n",
 701                            wc->status, wr_id, wc->vendor_err);
 702
 703                 path = tx->path;
 704
 705                 if (path) {
 706                         path->cm = NULL;
 707                         rb_erase(&path->rb_node, &priv->path_tree);
 708                         list_del(&path->list);
 709                 }
 710
 711                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 712                         list_move(&tx->list, &priv->cm.reap_list);
 713                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 714                 }
 715
 716                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 717         }
 718
 719 }
 720
 721 int ipoib_cm_dev_open(struct ipoib_dev_priv *priv)
 722 {
 723         int ret;
 724
 725         if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)))
 726                 return 0;
 727
 728         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, priv);
 729         if (IS_ERR(priv->cm.id)) {
 730                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 731                 ret = PTR_ERR(priv->cm.id);
 732                 goto err_cm;
 733         }
 734
 735         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 736                            0, NULL);
 737         if (ret) {
 738                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 739                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 740                 goto err_listen;
 741         }
 742
 743         return 0;
 744
 745 err_listen:
 746         ib_destroy_cm_id(priv->cm.id);
 747 err_cm:
 748         priv->cm.id = NULL;
 749         return ret;
 750 }
 751
 752 static void ipoib_cm_free_rx_reap_list(struct ipoib_dev_priv *priv)
 753 {
 754         struct ipoib_cm_rx *rx, *n;
 755         LIST_HEAD(list);
 756
 757         spin_lock_irq(&priv->lock);
 758         list_splice_init(&priv->cm.rx_reap_list, &list);
 759         spin_unlock_irq(&priv->lock);
 760
 761         list_for_each_entry_safe(rx, n, &list, list) {
 762                 ib_destroy_cm_id(rx->id);
 763                 ib_destroy_qp(rx->qp);
 764                 if (!ipoib_cm_has_srq(priv)) {
 765                         ipoib_cm_free_rx_ring(priv, rx->rx_ring);
 766                         spin_lock_irq(&priv->lock);
 767                         --priv->cm.nonsrq_conn_qp;
 768                         spin_unlock_irq(&priv->lock);
 769                 }
 770                 kfree(rx);
 771         }
 772 }
 773
 774 void ipoib_cm_dev_stop(struct ipoib_dev_priv *priv)
 775 {
 776         struct ipoib_cm_rx *p;
 777         unsigned long begin;
 778         int ret;
 779
 780         if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)) || !priv->cm.id)
 781                 return;
 782
 783         ib_destroy_cm_id(priv->cm.id);
 784         priv->cm.id = NULL;
 785
 786         cancel_work_sync(&priv->cm.rx_reap_task);
 787
 788         spin_lock_irq(&priv->lock);
 789         while (!list_empty(&priv->cm.passive_ids)) {
 790                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 791                 list_move(&p->list, &priv->cm.rx_error_list);
 792                 p->state = IPOIB_CM_RX_ERROR;
 793                 spin_unlock_irq(&priv->lock);
 794                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 795                 if (ret)
 796                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 797                 spin_lock_irq(&priv->lock);
 798         }
 799
 800         /* Wait for all RX to be drained */
 801         begin = jiffies;
 802
 803         while (!list_empty(&priv->cm.rx_error_list) ||
 804                !list_empty(&priv->cm.rx_flush_list) ||
 805                !list_empty(&priv->cm.rx_drain_list)) {
 806                 if (time_after(jiffies, begin + 5 * HZ)) {
 807                         ipoib_warn(priv, "RX drain timing out\n");
 808
 809                         /*
 810                          * assume the HW is wedged and just free up everything.
 811                          */
 812                         list_splice_init(&priv->cm.rx_flush_list,
 813                                          &priv->cm.rx_reap_list);
 814                         list_splice_init(&priv->cm.rx_error_list,
 815                                          &priv->cm.rx_reap_list);
 816                         list_splice_init(&priv->cm.rx_drain_list,
 817                                          &priv->cm.rx_reap_list);
 818                         break;
 819                 }
 820                 spin_unlock_irq(&priv->lock);
 821                 msleep(1);
 822                 ipoib_drain_cq(priv);
 823                 spin_lock_irq(&priv->lock);
 824         }
 825
 826         spin_unlock_irq(&priv->lock);
 827
 828         ipoib_cm_free_rx_reap_list(priv);
 829
 830         cancel_delayed_work(&priv->cm.stale_task);
 831 }
 832
 833 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 834 {
 835         struct ipoib_cm_tx *p = cm_id->context;
 836         struct ipoib_dev_priv *priv = p->priv;
 837         struct ipoib_cm_data *data = event->private_data;
 838         struct ifqueue mbqueue;
 839         struct ib_qp_attr qp_attr;
 840         int qp_attr_mask, ret;
 841         struct mbuf *mb;
 842
 843         ipoib_dbg(priv, "cm rep handler\n");
 844         p->mtu = be32_to_cpu(data->mtu);
 845
 846         if (p->mtu <= IPOIB_ENCAP_LEN) {
 847                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 848                            p->mtu, IPOIB_ENCAP_LEN);
 849                 return -EINVAL;
 850         }
 851
 852         qp_attr.qp_state = IB_QPS_RTR;
 853         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 854         if (ret) {
 855                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 856                 return ret;
 857         }
 858
 859         qp_attr.rq_psn = 0 /* FIXME */;
 860         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 861         if (ret) {
 862                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 863                 return ret;
 864         }
 865
 866         qp_attr.qp_state = IB_QPS_RTS;
 867         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 868         if (ret) {
 869                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 870                 return ret;
 871         }
 872         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 873         if (ret) {
 874                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 875                 return ret;
 876         }
 877
 878         bzero(&mbqueue, sizeof(mbqueue));
 879
 880         spin_lock_irq(&priv->lock);
 881         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 882         if (p->path)
 883                 for (;;) {
 884                         _IF_DEQUEUE(&p->path->queue, mb);
 885                         if (mb == NULL)
 886                                 break;
 887                         _IF_ENQUEUE(&mbqueue, mb);
 888                 }
 889         spin_unlock_irq(&priv->lock);
 890
 891         for (;;) {
 892                 struct ifnet *dev = p->priv->dev;
 893                 _IF_DEQUEUE(&mbqueue, mb);
 894                 if (mb == NULL)
 895                         break;
 896                 mb->m_pkthdr.rcvif = dev;
 897                 if (dev->if_transmit(dev, mb))
 898                         ipoib_warn(priv, "dev_queue_xmit failed "
 899                                    "to requeue packet\n");
 900         }
 901
 902         ret = ib_send_cm_rtu(cm_id, NULL, 0);
 903         if (ret) {
 904                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
 905                 return ret;
 906         }
 907         return 0;
 908 }
 909
 910 static struct ib_qp *ipoib_cm_create_tx_qp(struct ipoib_dev_priv *priv,
 911     struct ipoib_cm_tx *tx)
 912 {
 913         struct ib_qp_init_attr attr = {
 914                 .send_cq                = priv->send_cq,
 915                 .recv_cq                = priv->recv_cq,
 916                 .srq                    = priv->cm.srq,
 917                 .cap.max_send_wr        = ipoib_sendq_size,
 918                 .cap.max_send_sge       = priv->cm.num_frags,
 919                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
 920                 .qp_type                = IB_QPT_RC,
 921                 .qp_context             = tx
 922         };
 923
 924         return ib_create_qp(priv->pd, &attr);
 925 }
 926
 927 static int ipoib_cm_send_req(struct ipoib_dev_priv *priv,
 928                              struct ib_cm_id *id, struct ib_qp *qp,
 929                              u32 qpn,
 930                              struct ib_sa_path_rec *pathrec)
 931 {
 932         struct ipoib_cm_data data = {};
 933         struct ib_cm_req_param req = {};
 934
 935         ipoib_dbg(priv, "cm send req\n");
 936
 937         data.qpn = cpu_to_be32(priv->qp->qp_num);
 938         data.mtu = cpu_to_be32(priv->cm.max_cm_mtu);
 939
 940         req.primary_path                = pathrec;
 941         req.alternate_path              = NULL;
 942         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
 943         req.qp_num                      = qp->qp_num;
 944         req.qp_type                     = qp->qp_type;
 945         req.private_data                = &data;
 946         req.private_data_len            = sizeof data;
 947         req.flow_control                = 0;
 948
 949         req.starting_psn                = 0; /* FIXME */
 950
 951         /*
 952          * Pick some arbitrary defaults here; we could make these
 953          * module parameters if anyone cared about setting them.
 954          */
 955         req.responder_resources         = 4;
 956         req.remote_cm_response_timeout  = 20;
 957         req.local_cm_response_timeout   = 20;
 958         req.retry_count                 = 0; /* RFC draft warns against retries */
 959         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
 960         req.max_cm_retries              = 15;
 961         req.srq                         = ipoib_cm_has_srq(priv);
 962         return ib_send_cm_req(id, &req);
 963 }
 964
 965 static int ipoib_cm_modify_tx_init(struct ipoib_dev_priv *priv,
 966                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
 967 {
 968         struct ib_qp_attr qp_attr;
 969         int qp_attr_mask, ret;
 970         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
 971         if (ret) {
 972                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
 973                 return ret;
 974         }
 975
 976         qp_attr.qp_state = IB_QPS_INIT;
 977         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 978         qp_attr.port_num = priv->port;
 979         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
 980
 981         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 982         if (ret) {
 983                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
 984                 return ret;
 985         }
 986         return 0;
 987 }
 988
 989 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
 990                             struct ib_sa_path_rec *pathrec)
 991 {
 992         struct ipoib_dev_priv *priv = p->priv;
 993         int ret;
 994
 995         p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, GFP_KERNEL);
 996         if (!p->tx_ring) {
 997                 ipoib_warn(priv, "failed to allocate tx ring\n");
 998                 ret = -ENOMEM;
 999                 goto err_tx;
1000         }
1001         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1002
1003         p->qp = ipoib_cm_create_tx_qp(p->priv, p);
1004         if (IS_ERR(p->qp)) {
1005                 ret = PTR_ERR(p->qp);
1006                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1007                 goto err_qp;
1008         }
1009
1010         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1011         if (IS_ERR(p->id)) {
1012                 ret = PTR_ERR(p->id);
1013                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1014                 goto err_id;
1015         }
1016
1017         ret = ipoib_cm_modify_tx_init(p->priv, p->id,  p->qp);
1018         if (ret) {
1019                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1020                 goto err_modify;
1021         }
1022
1023         ret = ipoib_cm_send_req(p->priv, p->id, p->qp, qpn, pathrec);
1024         if (ret) {
1025                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1026                 goto err_send_cm;
1027         }
1028
1029         ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1030                   p->qp->qp_num, pathrec->dgid.raw, qpn);
1031
1032         return 0;
1033
1034 err_send_cm:
1035 err_modify:
1036         ib_destroy_cm_id(p->id);
1037 err_id:
1038         p->id = NULL;
1039         ib_destroy_qp(p->qp);
1040 err_qp:
1041         p->qp = NULL;
1042         kfree(p->tx_ring);
1043 err_tx:
1044         return ret;
1045 }
1046
1047 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1048 {
1049         struct ipoib_dev_priv *priv = p->priv;
1050         struct ifnet *dev = priv->dev;
1051         struct ipoib_cm_tx_buf *tx_req;
1052         unsigned long begin;
1053
1054         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1055                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1056
1057         if (p->path)
1058                 ipoib_path_free(priv, p->path);
1059
1060         if (p->id)
1061                 ib_destroy_cm_id(p->id);
1062
1063         if (p->tx_ring) {
1064                 /* Wait for all sends to complete */
1065                 begin = jiffies;
1066                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1067                         if (time_after(jiffies, begin + 5 * HZ)) {
1068                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1069                                            p->tx_head - p->tx_tail);
1070                                 goto timeout;
1071                         }
1072
1073                         msleep(1);
1074                 }
1075         }
1076
1077 timeout:
1078
1079         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1080                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1081                 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req);
1082                 m_freem(tx_req->mb);
1083                 ++p->tx_tail;
1084                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1085                     (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 &&
1086                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1087                         dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
1088         }
1089
1090         if (p->qp)
1091                 ib_destroy_qp(p->qp);
1092
1093         kfree(p->tx_ring);
1094         kfree(p);
1095 }
1096
1097 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1098                                struct ib_cm_event *event)
1099 {
1100         struct ipoib_cm_tx *tx = cm_id->context;
1101         struct ipoib_dev_priv *priv = tx->priv;
1102         struct ipoib_path *path;
1103         unsigned long flags;
1104         int ret;
1105
1106         switch (event->event) {
1107         case IB_CM_DREQ_RECEIVED:
1108                 ipoib_dbg(priv, "DREQ received.\n");
1109                 ib_send_cm_drep(cm_id, NULL, 0);
1110                 break;
1111         case IB_CM_REP_RECEIVED:
1112                 ipoib_dbg(priv, "REP received.\n");
1113                 ret = ipoib_cm_rep_handler(cm_id, event);
1114                 if (ret)
1115                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1116                                        NULL, 0, NULL, 0);
1117                 break;
1118         case IB_CM_REQ_ERROR:
1119         case IB_CM_REJ_RECEIVED:
1120         case IB_CM_TIMEWAIT_EXIT:
1121                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1122                 spin_lock_irqsave(&priv->lock, flags);
1123                 path = tx->path;
1124
1125                 if (path) {
1126                         path->cm = NULL;
1127                         tx->path = NULL;
1128                         rb_erase(&path->rb_node, &priv->path_tree);
1129                         list_del(&path->list);
1130                 }
1131
1132                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1133                         list_move(&tx->list, &priv->cm.reap_list);
1134                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
1135                 }
1136
1137                 spin_unlock_irqrestore(&priv->lock, flags);
1138                 if (path)
1139                         ipoib_path_free(tx->priv, path);
1140                 break;
1141         default:
1142                 break;
1143         }
1144
1145         return 0;
1146 }
1147
1148 struct ipoib_cm_tx *ipoib_cm_create_tx(struct ipoib_dev_priv *priv,
1149     struct ipoib_path *path)
1150 {
1151         struct ipoib_cm_tx *tx;
1152
1153         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1154         if (!tx)
1155                 return NULL;
1156
1157         ipoib_dbg(priv, "Creating cm tx\n");
1158         path->cm = tx;
1159         tx->path = path;
1160         tx->priv = priv;
1161         list_add(&tx->list, &priv->cm.start_list);
1162         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1163         queue_work(ipoib_workqueue, &priv->cm.start_task);
1164         return tx;
1165 }
1166
1167 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1168 {
1169         struct ipoib_dev_priv *priv = tx->priv;
1170         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1171                 spin_lock(&priv->lock);
1172                 list_move(&tx->list, &priv->cm.reap_list);
1173                 spin_unlock(&priv->lock);
1174                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1175                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1176                           tx->path->pathrec.dgid.raw);
1177                 tx->path = NULL;
1178         }
1179 }
1180
1181 static void ipoib_cm_tx_start(struct work_struct *work)
1182 {
1183         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1184                                                    cm.start_task);
1185         struct ipoib_path *path;
1186         struct ipoib_cm_tx *p;
1187         unsigned long flags;
1188         int ret;
1189
1190         struct ib_sa_path_rec pathrec;
1191         u32 qpn;
1192
1193         ipoib_dbg(priv, "cm start task\n");
1194         spin_lock_irqsave(&priv->lock, flags);
1195
1196         while (!list_empty(&priv->cm.start_list)) {
1197                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1198                 list_del_init(&p->list);
1199                 path = p->path;
1200                 qpn = IPOIB_QPN(path->hwaddr);
1201                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1202
1203                 spin_unlock_irqrestore(&priv->lock, flags);
1204
1205                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1206
1207                 spin_lock_irqsave(&priv->lock, flags);
1208
1209                 if (ret) {
1210                         path = p->path;
1211                         if (path) {
1212                                 path->cm = NULL;
1213                                 rb_erase(&path->rb_node, &priv->path_tree);
1214                                 list_del(&path->list);
1215                                 ipoib_path_free(priv, path);
1216                         }
1217                         list_del(&p->list);
1218                         kfree(p);
1219                 }
1220         }
1221
1222         spin_unlock_irqrestore(&priv->lock, flags);
1223 }
1224
1225 static void ipoib_cm_tx_reap(struct work_struct *work)
1226 {
1227         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1228                                                    cm.reap_task);
1229         struct ipoib_cm_tx *p;
1230         unsigned long flags;
1231
1232         spin_lock_irqsave(&priv->lock, flags);
1233
1234         while (!list_empty(&priv->cm.reap_list)) {
1235                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1236                 list_del(&p->list);
1237                 spin_unlock_irqrestore(&priv->lock, flags);
1238                 ipoib_cm_tx_destroy(p);
1239                 spin_lock_irqsave(&priv->lock, flags);
1240         }
1241
1242         spin_unlock_irqrestore(&priv->lock, flags);
1243 }
1244
1245 static void ipoib_cm_mb_reap(struct work_struct *work)
1246 {
1247         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1248                                                    cm.mb_task);
1249         struct mbuf *mb;
1250         unsigned long flags;
1251         unsigned mtu = priv->mcast_mtu;
1252         uint16_t proto;
1253
1254         spin_lock_irqsave(&priv->lock, flags);
1255
1256         for (;;) {
1257                 IF_DEQUEUE(&priv->cm.mb_queue, mb);
1258                 if (mb == NULL)
1259                         break;
1260                 spin_unlock_irqrestore(&priv->lock, flags);
1261
1262                 proto = htons(*mtod(mb, uint16_t *));
1263                 m_adj(mb, IPOIB_ENCAP_LEN);
1264                 if (proto == ETHERTYPE_IP)
1265                         icmp_error(mb, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, mtu);
1266 #if defined(INET6)
1267                 else if (proto == ETHERTYPE_IPV6)
1268                         icmp6_error(mb, ICMP6_PACKET_TOO_BIG, 0, mtu);
1269 #endif
1270                 else
1271                         m_freem(mb);
1272
1273                 spin_lock_irqsave(&priv->lock, flags);
1274         }
1275
1276         spin_unlock_irqrestore(&priv->lock, flags);
1277 }
1278
1279 void
1280 ipoib_cm_mb_too_long(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int mtu)
1281 {
1282         int e = priv->cm.mb_queue.ifq_len;
1283
1284         IF_ENQUEUE(&priv->cm.mb_queue, mb);
1285         if (e == 0)
1286                 queue_work(ipoib_workqueue, &priv->cm.mb_task);
1287 }
1288
1289 static void ipoib_cm_rx_reap(struct work_struct *work)
1290 {
1291         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1292                                                 cm.rx_reap_task));
1293 }
1294
1295 static void ipoib_cm_stale_task(struct work_struct *work)
1296 {
1297         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1298                                                    cm.stale_task.work);
1299         struct ipoib_cm_rx *p;
1300         int ret;
1301
1302         spin_lock_irq(&priv->lock);
1303         while (!list_empty(&priv->cm.passive_ids)) {
1304                 /* List is sorted by LRU, start from tail,
1305                  * stop when we see a recently used entry */
1306                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1307                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1308                         break;
1309                 list_move(&p->list, &priv->cm.rx_error_list);
1310                 p->state = IPOIB_CM_RX_ERROR;
1311                 spin_unlock_irq(&priv->lock);
1312                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1313                 if (ret)
1314                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1315                 spin_lock_irq(&priv->lock);
1316         }
1317
1318         if (!list_empty(&priv->cm.passive_ids))
1319                 queue_delayed_work(ipoib_workqueue,
1320                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1321         spin_unlock_irq(&priv->lock);
1322 }
1323
1324
1325 static void ipoib_cm_create_srq(struct ipoib_dev_priv *priv, int max_sge)
1326 {
1327         struct ib_srq_init_attr srq_init_attr = {
1328                 .attr = {
1329                         .max_wr  = ipoib_recvq_size,
1330                         .max_sge = max_sge
1331                 }
1332         };
1333
1334         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1335         if (IS_ERR(priv->cm.srq)) {
1336                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1337                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1338                                priv->ca->name, PTR_ERR(priv->cm.srq));
1339                 priv->cm.srq = NULL;
1340                 return;
1341         }
1342
1343         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, GFP_KERNEL);
1344         if (!priv->cm.srq_ring) {
1345                 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1346                        priv->ca->name, ipoib_recvq_size);
1347                 ib_destroy_srq(priv->cm.srq);
1348                 priv->cm.srq = NULL;
1349                 return;
1350         }
1351
1352         memset(priv->cm.srq_ring, 0, ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1353 }
1354
1355 int ipoib_cm_dev_init(struct ipoib_dev_priv *priv)
1356 {
1357         struct ifnet *dev = priv->dev;
1358         int i, ret;
1359         struct ib_device_attr attr;
1360
1361         INIT_LIST_HEAD(&priv->cm.passive_ids);
1362         INIT_LIST_HEAD(&priv->cm.reap_list);
1363         INIT_LIST_HEAD(&priv->cm.start_list);
1364         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1365         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1366         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1367         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1368         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1369         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1370         INIT_WORK(&priv->cm.mb_task, ipoib_cm_mb_reap);
1371         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1372         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1373
1374         bzero(&priv->cm.mb_queue, sizeof(priv->cm.mb_queue));
1375         mtx_init(&priv->cm.mb_queue.ifq_mtx,
1376             dev->if_xname, "if send queue", MTX_DEF);
1377
1378         ret = ib_query_device(priv->ca, &attr);
1379         if (ret) {
1380                 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1381                 return ret;
1382         }
1383
1384         ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1385
1386         attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1387         ipoib_cm_create_srq(priv, attr.max_srq_sge);
1388         if (ipoib_cm_has_srq(priv)) {
1389                 priv->cm.max_cm_mtu = attr.max_srq_sge * MJUMPAGESIZE;
1390                 priv->cm.num_frags  = attr.max_srq_sge;
1391                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1392                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1393         } else {
1394                 priv->cm.max_cm_mtu = IPOIB_CM_MAX_MTU;
1395                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1396         }
1397
1398         ipoib_cm_init_rx_wr(priv, &priv->cm.rx_wr, priv->cm.rx_sge);
1399
1400         if (ipoib_cm_has_srq(priv)) {
1401                 for (i = 0; i < ipoib_recvq_size; ++i) {
1402                         if (!ipoib_cm_alloc_rx_mb(priv, &priv->cm.srq_ring[i])) {
1403                                 ipoib_warn(priv, "failed to allocate "
1404                                            "receive buffer %d\n", i);
1405                                 ipoib_cm_dev_cleanup(priv);
1406                                 return -ENOMEM;
1407                         }
1408
1409                         if (ipoib_cm_post_receive_srq(priv, i)) {
1410                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1411                                            "failed for buf %d\n", i);
1412                                 ipoib_cm_dev_cleanup(priv);
1413                                 return -EIO;
1414                         }
1415                 }
1416         }
1417
1418         IF_LLADDR(priv->dev)[0] = IPOIB_FLAGS_RC;
1419         return 0;
1420 }
1421
1422 void ipoib_cm_dev_cleanup(struct ipoib_dev_priv *priv)
1423 {
1424         int ret;
1425
1426         if (!priv->cm.srq)
1427                 return;
1428
1429         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1430
1431         ret = ib_destroy_srq(priv->cm.srq);
1432         if (ret)
1433                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1434
1435         priv->cm.srq = NULL;
1436         if (!priv->cm.srq_ring)
1437                 return;
1438
1439         ipoib_cm_free_rx_ring(priv, priv->cm.srq_ring);
1440         priv->cm.srq_ring = NULL;
1441
1442         mtx_destroy(&priv->cm.mb_queue.ifq_mtx);
1443 }
1444
1445 #endif /* CONFIG_INFINIBAND_IPOIB_CM */