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
 686         m_freem(tx_req->mb);
 687
 688         ++tx->tx_tail;
 689         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 690             (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 &&
 691             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 692                 dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
 693
 694         if (wc->status != IB_WC_SUCCESS &&
 695             wc->status != IB_WC_WR_FLUSH_ERR) {
 696                 struct ipoib_path *path;
 697
 698                 ipoib_dbg(priv, "failed cm send event "
 699                            "(status=%d, wrid=%d vend_err %x)\n",
 700                            wc->status, wr_id, wc->vendor_err);
 701
 702                 path = tx->path;
 703
 704                 if (path) {
 705                         path->cm = NULL;
 706                         rb_erase(&path->rb_node, &priv->path_tree);
 707                         list_del(&path->list);
 708                 }
 709
 710                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 711                         list_move(&tx->list, &priv->cm.reap_list);
 712                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 713                 }
 714
 715                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 716         }
 717
 718 }
 719
 720 int ipoib_cm_dev_open(struct ipoib_dev_priv *priv)
 721 {
 722         int ret;
 723
 724         if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)))
 725                 return 0;
 726
 727         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, priv);
 728         if (IS_ERR(priv->cm.id)) {
 729                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 730                 ret = PTR_ERR(priv->cm.id);
 731                 goto err_cm;
 732         }
 733
 734         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 735                            0, NULL);
 736         if (ret) {
 737                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 738                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 739                 goto err_listen;
 740         }
 741
 742         return 0;
 743
 744 err_listen:
 745         ib_destroy_cm_id(priv->cm.id);
 746 err_cm:
 747         priv->cm.id = NULL;
 748         return ret;
 749 }
 750
 751 static void ipoib_cm_free_rx_reap_list(struct ipoib_dev_priv *priv)
 752 {
 753         struct ipoib_cm_rx *rx, *n;
 754         LIST_HEAD(list);
 755
 756         spin_lock_irq(&priv->lock);
 757         list_splice_init(&priv->cm.rx_reap_list, &list);
 758         spin_unlock_irq(&priv->lock);
 759
 760         list_for_each_entry_safe(rx, n, &list, list) {
 761                 ib_destroy_cm_id(rx->id);
 762                 ib_destroy_qp(rx->qp);
 763                 if (!ipoib_cm_has_srq(priv)) {
 764                         ipoib_cm_free_rx_ring(priv, rx->rx_ring);
 765                         spin_lock_irq(&priv->lock);
 766                         --priv->cm.nonsrq_conn_qp;
 767                         spin_unlock_irq(&priv->lock);
 768                 }
 769                 kfree(rx);
 770         }
 771 }
 772
 773 void ipoib_cm_dev_stop(struct ipoib_dev_priv *priv)
 774 {
 775         struct ipoib_cm_rx *p;
 776         unsigned long begin;
 777         int ret;
 778
 779         if (!IPOIB_CM_SUPPORTED(IF_LLADDR(priv->dev)) || !priv->cm.id)
 780                 return;
 781
 782         ib_destroy_cm_id(priv->cm.id);
 783         priv->cm.id = NULL;
 784
 785         cancel_work_sync(&priv->cm.rx_reap_task);
 786
 787         spin_lock_irq(&priv->lock);
 788         while (!list_empty(&priv->cm.passive_ids)) {
 789                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 790                 list_move(&p->list, &priv->cm.rx_error_list);
 791                 p->state = IPOIB_CM_RX_ERROR;
 792                 spin_unlock_irq(&priv->lock);
 793                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 794                 if (ret)
 795                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 796                 spin_lock_irq(&priv->lock);
 797         }
 798
 799         /* Wait for all RX to be drained */
 800         begin = jiffies;
 801
 802         while (!list_empty(&priv->cm.rx_error_list) ||
 803                !list_empty(&priv->cm.rx_flush_list) ||
 804                !list_empty(&priv->cm.rx_drain_list)) {
 805                 if (time_after(jiffies, begin + 5 * HZ)) {
 806                         ipoib_warn(priv, "RX drain timing out\n");
 807
 808                         /*
 809                          * assume the HW is wedged and just free up everything.
 810                          */
 811                         list_splice_init(&priv->cm.rx_flush_list,
 812                                          &priv->cm.rx_reap_list);
 813                         list_splice_init(&priv->cm.rx_error_list,
 814                                          &priv->cm.rx_reap_list);
 815                         list_splice_init(&priv->cm.rx_drain_list,
 816                                          &priv->cm.rx_reap_list);
 817                         break;
 818                 }
 819                 spin_unlock_irq(&priv->lock);
 820                 msleep(1);
 821                 ipoib_drain_cq(priv);
 822                 spin_lock_irq(&priv->lock);
 823         }
 824
 825         spin_unlock_irq(&priv->lock);
 826
 827         ipoib_cm_free_rx_reap_list(priv);
 828
 829         cancel_delayed_work(&priv->cm.stale_task);
 830 }
 831
 832 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 833 {
 834         struct ipoib_cm_tx *p = cm_id->context;
 835         struct ipoib_dev_priv *priv = p->priv;
 836         struct ipoib_cm_data *data = event->private_data;
 837         struct ifqueue mbqueue;
 838         struct ib_qp_attr qp_attr;
 839         int qp_attr_mask, ret;
 840         struct mbuf *mb;
 841
 842         ipoib_dbg(priv, "cm rep handler\n");
 843         p->mtu = be32_to_cpu(data->mtu);
 844
 845         if (p->mtu <= IPOIB_ENCAP_LEN) {
 846                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 847                            p->mtu, IPOIB_ENCAP_LEN);
 848                 return -EINVAL;
 849         }
 850
 851         qp_attr.qp_state = IB_QPS_RTR;
 852         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 853         if (ret) {
 854                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 855                 return ret;
 856         }
 857
 858         qp_attr.rq_psn = 0 /* FIXME */;
 859         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 860         if (ret) {
 861                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 862                 return ret;
 863         }
 864
 865         qp_attr.qp_state = IB_QPS_RTS;
 866         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 867         if (ret) {
 868                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 869                 return ret;
 870         }
 871         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 872         if (ret) {
 873                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 874                 return ret;
 875         }
 876
 877         bzero(&mbqueue, sizeof(mbqueue));
 878
 879         spin_lock_irq(&priv->lock);
 880         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 881         if (p->path)
 882                 for (;;) {
 883                         _IF_DEQUEUE(&p->path->queue, mb);
 884                         if (mb == NULL)
 885                                 break;
 886                         _IF_ENQUEUE(&mbqueue, mb);
 887                 }
 888         spin_unlock_irq(&priv->lock);
 889
 890         for (;;) {
 891                 struct ifnet *dev = p->priv->dev;
 892                 _IF_DEQUEUE(&mbqueue, mb);
 893                 if (mb == NULL)
 894                         break;
 895                 mb->m_pkthdr.rcvif = dev;
 896                 if (dev->if_transmit(dev, mb))
 897                         ipoib_warn(priv, "dev_queue_xmit failed "
 898                                    "to requeue packet\n");
 899         }
 900
 901         ret = ib_send_cm_rtu(cm_id, NULL, 0);
 902         if (ret) {
 903                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
 904                 return ret;
 905         }
 906         return 0;
 907 }
 908
 909 static struct ib_qp *ipoib_cm_create_tx_qp(struct ipoib_dev_priv *priv,
 910     struct ipoib_cm_tx *tx)
 911 {
 912         struct ib_qp_init_attr attr = {
 913                 .send_cq                = priv->send_cq,
 914                 .recv_cq                = priv->recv_cq,
 915                 .srq                    = priv->cm.srq,
 916                 .cap.max_send_wr        = ipoib_sendq_size,
 917                 .cap.max_send_sge       = priv->cm.num_frags,
 918                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
 919                 .qp_type                = IB_QPT_RC,
 920                 .qp_context             = tx
 921         };
 922
 923         return ib_create_qp(priv->pd, &attr);
 924 }
 925
 926 static int ipoib_cm_send_req(struct ipoib_dev_priv *priv,
 927                              struct ib_cm_id *id, struct ib_qp *qp,
 928                              u32 qpn,
 929                              struct ib_sa_path_rec *pathrec)
 930 {
 931         struct ipoib_cm_data data = {};
 932         struct ib_cm_req_param req = {};
 933
 934         ipoib_dbg(priv, "cm send req\n");
 935
 936         data.qpn = cpu_to_be32(priv->qp->qp_num);
 937         data.mtu = cpu_to_be32(priv->cm.max_cm_mtu);
 938
 939         req.primary_path                = pathrec;
 940         req.alternate_path              = NULL;
 941         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
 942         req.qp_num                      = qp->qp_num;
 943         req.qp_type                     = qp->qp_type;
 944         req.private_data                = &data;
 945         req.private_data_len            = sizeof data;
 946         req.flow_control                = 0;
 947
 948         req.starting_psn                = 0; /* FIXME */
 949
 950         /*
 951          * Pick some arbitrary defaults here; we could make these
 952          * module parameters if anyone cared about setting them.
 953          */
 954         req.responder_resources         = 4;
 955         req.remote_cm_response_timeout  = 20;
 956         req.local_cm_response_timeout   = 20;
 957         req.retry_count                 = 0; /* RFC draft warns against retries */
 958         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
 959         req.max_cm_retries              = 15;
 960         req.srq                         = ipoib_cm_has_srq(priv);
 961         return ib_send_cm_req(id, &req);
 962 }
 963
 964 static int ipoib_cm_modify_tx_init(struct ipoib_dev_priv *priv,
 965                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
 966 {
 967         struct ib_qp_attr qp_attr;
 968         int qp_attr_mask, ret;
 969         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
 970         if (ret) {
 971                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
 972                 return ret;
 973         }
 974
 975         qp_attr.qp_state = IB_QPS_INIT;
 976         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 977         qp_attr.port_num = priv->port;
 978         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
 979
 980         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 981         if (ret) {
 982                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
 983                 return ret;
 984         }
 985         return 0;
 986 }
 987
 988 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
 989                             struct ib_sa_path_rec *pathrec)
 990 {
 991         struct ipoib_dev_priv *priv = p->priv;
 992         int ret;
 993
 994         p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring, GFP_KERNEL);
 995         if (!p->tx_ring) {
 996                 ipoib_warn(priv, "failed to allocate tx ring\n");
 997                 ret = -ENOMEM;
 998                 goto err_tx;
 999         }
1000         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1001
1002         p->qp = ipoib_cm_create_tx_qp(p->priv, p);
1003         if (IS_ERR(p->qp)) {
1004                 ret = PTR_ERR(p->qp);
1005                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1006                 goto err_qp;
1007         }
1008
1009         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1010         if (IS_ERR(p->id)) {
1011                 ret = PTR_ERR(p->id);
1012                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1013                 goto err_id;
1014         }
1015
1016         ret = ipoib_cm_modify_tx_init(p->priv, p->id,  p->qp);
1017         if (ret) {
1018                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1019                 goto err_modify;
1020         }
1021
1022         ret = ipoib_cm_send_req(p->priv, p->id, p->qp, qpn, pathrec);
1023         if (ret) {
1024                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1025                 goto err_send_cm;
1026         }
1027
1028         ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1029                   p->qp->qp_num, pathrec->dgid.raw, qpn);
1030
1031         return 0;
1032
1033 err_send_cm:
1034 err_modify:
1035         ib_destroy_cm_id(p->id);
1036 err_id:
1037         p->id = NULL;
1038         ib_destroy_qp(p->qp);
1039 err_qp:
1040         p->qp = NULL;
1041         kfree(p->tx_ring);
1042 err_tx:
1043         return ret;
1044 }
1045
1046 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1047 {
1048         struct ipoib_dev_priv *priv = p->priv;
1049         struct ifnet *dev = priv->dev;
1050         struct ipoib_cm_tx_buf *tx_req;
1051         unsigned long begin;
1052
1053         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1054                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1055
1056         if (p->path)
1057                 ipoib_path_free(priv, p->path);
1058
1059         if (p->id)
1060                 ib_destroy_cm_id(p->id);
1061
1062         if (p->tx_ring) {
1063                 /* Wait for all sends to complete */
1064                 begin = jiffies;
1065                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1066                         if (time_after(jiffies, begin + 5 * HZ)) {
1067                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1068                                            p->tx_head - p->tx_tail);
1069                                 goto timeout;
1070                         }
1071
1072                         msleep(1);
1073                 }
1074         }
1075
1076 timeout:
1077
1078         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1079                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1080                 ipoib_dma_unmap_tx(priv->ca, (struct ipoib_tx_buf *)tx_req);
1081                 m_freem(tx_req->mb);
1082                 ++p->tx_tail;
1083                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1084                     (dev->if_drv_flags & IFF_DRV_OACTIVE) != 0 &&
1085                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1086                         dev->if_drv_flags &= ~IFF_DRV_OACTIVE;
1087         }
1088
1089         if (p->qp)
1090                 ib_destroy_qp(p->qp);
1091
1092         kfree(p->tx_ring);
1093         kfree(p);
1094 }
1095
1096 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1097                                struct ib_cm_event *event)
1098 {
1099         struct ipoib_cm_tx *tx = cm_id->context;
1100         struct ipoib_dev_priv *priv = tx->priv;
1101         struct ipoib_path *path;
1102         unsigned long flags;
1103         int ret;
1104
1105         switch (event->event) {
1106         case IB_CM_DREQ_RECEIVED:
1107                 ipoib_dbg(priv, "DREQ received.\n");
1108                 ib_send_cm_drep(cm_id, NULL, 0);
1109                 break;
1110         case IB_CM_REP_RECEIVED:
1111                 ipoib_dbg(priv, "REP received.\n");
1112                 ret = ipoib_cm_rep_handler(cm_id, event);
1113                 if (ret)
1114                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1115                                        NULL, 0, NULL, 0);
1116                 break;
1117         case IB_CM_REQ_ERROR:
1118         case IB_CM_REJ_RECEIVED:
1119         case IB_CM_TIMEWAIT_EXIT:
1120                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1121                 spin_lock_irqsave(&priv->lock, flags);
1122                 path = tx->path;
1123
1124                 if (path) {
1125                         path->cm = NULL;
1126                         tx->path = NULL;
1127                         rb_erase(&path->rb_node, &priv->path_tree);
1128                         list_del(&path->list);
1129                 }
1130
1131                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1132                         list_move(&tx->list, &priv->cm.reap_list);
1133                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
1134                 }
1135
1136                 spin_unlock_irqrestore(&priv->lock, flags);
1137                 if (path)
1138                         ipoib_path_free(tx->priv, path);
1139                 break;
1140         default:
1141                 break;
1142         }
1143
1144         return 0;
1145 }
1146
1147 struct ipoib_cm_tx *ipoib_cm_create_tx(struct ipoib_dev_priv *priv,
1148     struct ipoib_path *path)
1149 {
1150         struct ipoib_cm_tx *tx;
1151
1152         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1153         if (!tx)
1154                 return NULL;
1155
1156         ipoib_dbg(priv, "Creating cm tx\n");
1157         path->cm = tx;
1158         tx->path = path;
1159         tx->priv = priv;
1160         list_add(&tx->list, &priv->cm.start_list);
1161         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1162         queue_work(ipoib_workqueue, &priv->cm.start_task);
1163         return tx;
1164 }
1165
1166 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1167 {
1168         struct ipoib_dev_priv *priv = tx->priv;
1169         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1170                 spin_lock(&priv->lock);
1171                 list_move(&tx->list, &priv->cm.reap_list);
1172                 spin_unlock(&priv->lock);
1173                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1174                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1175                           tx->path->pathrec.dgid.raw);
1176                 tx->path = NULL;
1177         }
1178 }
1179
1180 static void ipoib_cm_tx_start(struct work_struct *work)
1181 {
1182         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1183                                                    cm.start_task);
1184         struct ipoib_path *path;
1185         struct ipoib_cm_tx *p;
1186         unsigned long flags;
1187         int ret;
1188
1189         struct ib_sa_path_rec pathrec;
1190         u32 qpn;
1191
1192         ipoib_dbg(priv, "cm start task\n");
1193         spin_lock_irqsave(&priv->lock, flags);
1194
1195         while (!list_empty(&priv->cm.start_list)) {
1196                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1197                 list_del_init(&p->list);
1198                 path = p->path;
1199                 qpn = IPOIB_QPN(path->hwaddr);
1200                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1201
1202                 spin_unlock_irqrestore(&priv->lock, flags);
1203
1204                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1205
1206                 spin_lock_irqsave(&priv->lock, flags);
1207
1208                 if (ret) {
1209                         path = p->path;
1210                         if (path) {
1211                                 path->cm = NULL;
1212                                 rb_erase(&path->rb_node, &priv->path_tree);
1213                                 list_del(&path->list);
1214                                 ipoib_path_free(priv, path);
1215                         }
1216                         list_del(&p->list);
1217                         kfree(p);
1218                 }
1219         }
1220
1221         spin_unlock_irqrestore(&priv->lock, flags);
1222 }
1223
1224 static void ipoib_cm_tx_reap(struct work_struct *work)
1225 {
1226         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1227                                                    cm.reap_task);
1228         struct ipoib_cm_tx *p;
1229         unsigned long flags;
1230
1231         spin_lock_irqsave(&priv->lock, flags);
1232
1233         while (!list_empty(&priv->cm.reap_list)) {
1234                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1235                 list_del(&p->list);
1236                 spin_unlock_irqrestore(&priv->lock, flags);
1237                 ipoib_cm_tx_destroy(p);
1238                 spin_lock_irqsave(&priv->lock, flags);
1239         }
1240
1241         spin_unlock_irqrestore(&priv->lock, flags);
1242 }
1243
1244 static void ipoib_cm_mb_reap(struct work_struct *work)
1245 {
1246         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1247                                                    cm.mb_task);
1248         struct mbuf *mb;
1249         unsigned long flags;
1250 #if defined(INET) || defined(INET6)
1251         unsigned mtu = priv->mcast_mtu;
1252 #endif
1253         uint16_t proto;
1254
1255         spin_lock_irqsave(&priv->lock, flags);
1256
1257         for (;;) {
1258                 IF_DEQUEUE(&priv->cm.mb_queue, mb);
1259                 if (mb == NULL)
1260                         break;
1261                 spin_unlock_irqrestore(&priv->lock, flags);
1262
1263                 proto = htons(*mtod(mb, uint16_t *));
1264                 m_adj(mb, IPOIB_ENCAP_LEN);
1265                 switch (proto) {
1266 #if defined(INET)
1267                 case ETHERTYPE_IP:
1268                         icmp_error(mb, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0, mtu);
1269                         break;
1270 #endif
1271 #if defined(INET6)
1272                 case ETHERTYPE_IPV6:
1273                         icmp6_error(mb, ICMP6_PACKET_TOO_BIG, 0, mtu);
1274                         break;
1275 #endif
1276                 default:
1277                         m_freem(mb);
1278                 }
1279
1280                 spin_lock_irqsave(&priv->lock, flags);
1281         }
1282
1283         spin_unlock_irqrestore(&priv->lock, flags);
1284 }
1285
1286 void
1287 ipoib_cm_mb_too_long(struct ipoib_dev_priv *priv, struct mbuf *mb, unsigned int mtu)
1288 {
1289         int e = priv->cm.mb_queue.ifq_len;
1290
1291         IF_ENQUEUE(&priv->cm.mb_queue, mb);
1292         if (e == 0)
1293                 queue_work(ipoib_workqueue, &priv->cm.mb_task);
1294 }
1295
1296 static void ipoib_cm_rx_reap(struct work_struct *work)
1297 {
1298         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1299                                                 cm.rx_reap_task));
1300 }
1301
1302 static void ipoib_cm_stale_task(struct work_struct *work)
1303 {
1304         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1305                                                    cm.stale_task.work);
1306         struct ipoib_cm_rx *p;
1307         int ret;
1308
1309         spin_lock_irq(&priv->lock);
1310         while (!list_empty(&priv->cm.passive_ids)) {
1311                 /* List is sorted by LRU, start from tail,
1312                  * stop when we see a recently used entry */
1313                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1314                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1315                         break;
1316                 list_move(&p->list, &priv->cm.rx_error_list);
1317                 p->state = IPOIB_CM_RX_ERROR;
1318                 spin_unlock_irq(&priv->lock);
1319                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1320                 if (ret)
1321                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1322                 spin_lock_irq(&priv->lock);
1323         }
1324
1325         if (!list_empty(&priv->cm.passive_ids))
1326                 queue_delayed_work(ipoib_workqueue,
1327                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1328         spin_unlock_irq(&priv->lock);
1329 }
1330
1331
1332 static void ipoib_cm_create_srq(struct ipoib_dev_priv *priv, int max_sge)
1333 {
1334         struct ib_srq_init_attr srq_init_attr = {
1335                 .attr = {
1336                         .max_wr  = ipoib_recvq_size,
1337                         .max_sge = max_sge
1338                 }
1339         };
1340
1341         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1342         if (IS_ERR(priv->cm.srq)) {
1343                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1344                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1345                                priv->ca->name, PTR_ERR(priv->cm.srq));
1346                 priv->cm.srq = NULL;
1347                 return;
1348         }
1349
1350         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring, GFP_KERNEL);
1351         if (!priv->cm.srq_ring) {
1352                 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1353                        priv->ca->name, ipoib_recvq_size);
1354                 ib_destroy_srq(priv->cm.srq);
1355                 priv->cm.srq = NULL;
1356                 return;
1357         }
1358
1359         memset(priv->cm.srq_ring, 0, ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1360 }
1361
1362 int ipoib_cm_dev_init(struct ipoib_dev_priv *priv)
1363 {
1364         struct ifnet *dev = priv->dev;
1365         int i, ret;
1366         struct ib_device_attr attr;
1367
1368         INIT_LIST_HEAD(&priv->cm.passive_ids);
1369         INIT_LIST_HEAD(&priv->cm.reap_list);
1370         INIT_LIST_HEAD(&priv->cm.start_list);
1371         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1372         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1373         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1374         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1375         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1376         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1377         INIT_WORK(&priv->cm.mb_task, ipoib_cm_mb_reap);
1378         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1379         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1380
1381         bzero(&priv->cm.mb_queue, sizeof(priv->cm.mb_queue));
1382         mtx_init(&priv->cm.mb_queue.ifq_mtx,
1383             dev->if_xname, "if send queue", MTX_DEF);
1384
1385         ret = ib_query_device(priv->ca, &attr);
1386         if (ret) {
1387                 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1388                 return ret;
1389         }
1390
1391         ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1392
1393         attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1394         ipoib_cm_create_srq(priv, attr.max_srq_sge);
1395         if (ipoib_cm_has_srq(priv)) {
1396                 priv->cm.max_cm_mtu = attr.max_srq_sge * MJUMPAGESIZE;
1397                 priv->cm.num_frags  = attr.max_srq_sge;
1398                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1399                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1400         } else {
1401                 priv->cm.max_cm_mtu = IPOIB_CM_MAX_MTU;
1402                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1403         }
1404
1405         ipoib_cm_init_rx_wr(priv, &priv->cm.rx_wr, priv->cm.rx_sge);
1406
1407         if (ipoib_cm_has_srq(priv)) {
1408                 for (i = 0; i < ipoib_recvq_size; ++i) {
1409                         if (!ipoib_cm_alloc_rx_mb(priv, &priv->cm.srq_ring[i])) {
1410                                 ipoib_warn(priv, "failed to allocate "
1411                                            "receive buffer %d\n", i);
1412                                 ipoib_cm_dev_cleanup(priv);
1413                                 return -ENOMEM;
1414                         }
1415
1416                         if (ipoib_cm_post_receive_srq(priv, i)) {
1417                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1418                                            "failed for buf %d\n", i);
1419                                 ipoib_cm_dev_cleanup(priv);
1420                                 return -EIO;
1421                         }
1422                 }
1423         }
1424
1425         IF_LLADDR(priv->dev)[0] = IPOIB_FLAGS_RC;
1426         return 0;
1427 }
1428
1429 void ipoib_cm_dev_cleanup(struct ipoib_dev_priv *priv)
1430 {
1431         int ret;
1432
1433         if (!priv->cm.srq)
1434                 return;
1435
1436         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1437
1438         ret = ib_destroy_srq(priv->cm.srq);
1439         if (ret)
1440                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1441
1442         priv->cm.srq = NULL;
1443         if (!priv->cm.srq_ring)
1444                 return;
1445
1446         ipoib_cm_free_rx_ring(priv, priv->cm.srq_ring);
1447         priv->cm.srq_ring = NULL;
1448
1449         mtx_destroy(&priv->cm.mb_queue.ifq_mtx);
1450 }
1451
1452 #endif /* CONFIG_INFINIBAND_IPOIB_CM */