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  * $Id$
  33  */
  34
  35 #include <rdma/ib_cm.h>
  36 #include <rdma/ib_cache.h>
  37 #include <net/dst.h>
  38 #include <net/icmp.h>
  39 #include <linux/icmpv6.h>
  40
  41 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  42 static int data_debug_level;
  43
  44 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  45 MODULE_PARM_DESC(cm_data_debug_level,
  46                  "Enable data path debug tracing for connected mode if > 0");
  47 #endif
  48
  49 #include "ipoib.h"
  50
  51 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  52
  53 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
  54 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
  55 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
  56 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
  57
  58 struct ipoib_cm_id {
  59         struct ib_cm_id *id;
  60         int flags;
  61         u32 remote_qpn;
  62         u32 remote_mtu;
  63 };
  64
  65 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  66                                struct ib_cm_event *event);
  67
  68 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv,
  69                                   u64 mapping[IPOIB_CM_RX_SG])
  70 {
  71         int i;
  72
  73         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
  74
  75         for (i = 0; i < IPOIB_CM_RX_SG - 1; ++i)
  76                 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
  77 }
  78
  79 static int ipoib_cm_post_receive(struct net_device *dev, int id)
  80 {
  81         struct ipoib_dev_priv *priv = netdev_priv(dev);
  82         struct ib_recv_wr *bad_wr;
  83         int i, ret;
  84
  85         priv->cm.rx_wr.wr_id = id | IPOIB_CM_OP_SRQ;
  86
  87         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
  88                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
  89
  90         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
  91         if (unlikely(ret)) {
  92                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
  93                 ipoib_cm_dma_unmap_rx(priv, priv->cm.srq_ring[id].mapping);
  94                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
  95                 priv->cm.srq_ring[id].skb = NULL;
  96         }
  97
  98         return ret;
  99 }
 100
 101 static int ipoib_cm_alloc_rx_skb(struct net_device *dev, int id,
 102                                  u64 mapping[IPOIB_CM_RX_SG])
 103 {
 104         struct ipoib_dev_priv *priv = netdev_priv(dev);
 105         struct sk_buff *skb;
 106         int i;
 107
 108         skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
 109         if (unlikely(!skb))
 110                 return -ENOMEM;
 111
 112         /*
 113          * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
 114          * IP header to a multiple of 16.
 115          */
 116         skb_reserve(skb, 12);
 117
 118         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 119                                        DMA_FROM_DEVICE);
 120         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 121                 dev_kfree_skb_any(skb);
 122                 return -EIO;
 123         }
 124
 125         for (i = 0; i < IPOIB_CM_RX_SG - 1; i++) {
 126                 struct page *page = alloc_page(GFP_ATOMIC);
 127
 128                 if (!page)
 129                         goto partial_error;
 130                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 131
 132                 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
 133                                                  0, PAGE_SIZE, DMA_TO_DEVICE);
 134                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 135                         goto partial_error;
 136         }
 137
 138         priv->cm.srq_ring[id].skb = skb;
 139         return 0;
 140
 141 partial_error:
 142
 143         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 144
 145         for (; i >= 0; --i)
 146                 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
 147
 148         kfree_skb(skb);
 149         return -ENOMEM;
 150 }
 151
 152 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 153                                            struct ipoib_cm_rx *p)
 154 {
 155         struct ipoib_dev_priv *priv = netdev_priv(dev);
 156         struct ib_qp_init_attr attr = {
 157                 .send_cq = priv->cq, /* does not matter, we never send anything */
 158                 .recv_cq = priv->cq,
 159                 .srq = priv->cm.srq,
 160                 .cap.max_send_wr = 1, /* FIXME: 0 Seems not to work */
 161                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 162                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 163                 .qp_type = IB_QPT_RC,
 164                 .qp_context = p,
 165         };
 166         return ib_create_qp(priv->pd, &attr);
 167 }
 168
 169 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 170                                   struct ib_cm_id *cm_id, struct ib_qp *qp,
 171                                   unsigned psn)
 172 {
 173         struct ipoib_dev_priv *priv = netdev_priv(dev);
 174         struct ib_qp_attr qp_attr;
 175         int qp_attr_mask, ret;
 176
 177         qp_attr.qp_state = IB_QPS_INIT;
 178         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 179         if (ret) {
 180                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 181                 return ret;
 182         }
 183         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 184         if (ret) {
 185                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 186                 return ret;
 187         }
 188         qp_attr.qp_state = IB_QPS_RTR;
 189         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 190         if (ret) {
 191                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 192                 return ret;
 193         }
 194         qp_attr.rq_psn = psn;
 195         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 196         if (ret) {
 197                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 198                 return ret;
 199         }
 200         return 0;
 201 }
 202
 203 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 204                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 205                              unsigned psn)
 206 {
 207         struct ipoib_dev_priv *priv = netdev_priv(dev);
 208         struct ipoib_cm_data data = {};
 209         struct ib_cm_rep_param rep = {};
 210
 211         data.qpn = cpu_to_be32(priv->qp->qp_num);
 212         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 213
 214         rep.private_data = &data;
 215         rep.private_data_len = sizeof data;
 216         rep.flow_control = 0;
 217         rep.rnr_retry_count = req->rnr_retry_count;
 218         rep.target_ack_delay = 20; /* FIXME */
 219         rep.srq = 1;
 220         rep.qp_num = qp->qp_num;
 221         rep.starting_psn = psn;
 222         return ib_send_cm_rep(cm_id, &rep);
 223 }
 224
 225 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 226 {
 227         struct net_device *dev = cm_id->context;
 228         struct ipoib_dev_priv *priv = netdev_priv(dev);
 229         struct ipoib_cm_rx *p;
 230         unsigned long flags;
 231         unsigned psn;
 232         int ret;
 233
 234         ipoib_dbg(priv, "REQ arrived\n");
 235         p = kzalloc(sizeof *p, GFP_KERNEL);
 236         if (!p)
 237                 return -ENOMEM;
 238         p->dev = dev;
 239         p->id = cm_id;
 240         p->qp = ipoib_cm_create_rx_qp(dev, p);
 241         if (IS_ERR(p->qp)) {
 242                 ret = PTR_ERR(p->qp);
 243                 goto err_qp;
 244         }
 245
 246         psn = random32() & 0xffffff;
 247         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 248         if (ret)
 249                 goto err_modify;
 250
 251         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 252         if (ret) {
 253                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 254                 goto err_rep;
 255         }
 256
 257         cm_id->context = p;
 258         p->jiffies = jiffies;
 259         spin_lock_irqsave(&priv->lock, flags);
 260         list_add(&p->list, &priv->cm.passive_ids);
 261         spin_unlock_irqrestore(&priv->lock, flags);
 262         queue_delayed_work(ipoib_workqueue,
 263                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 264         return 0;
 265
 266 err_rep:
 267 err_modify:
 268         ib_destroy_qp(p->qp);
 269 err_qp:
 270         kfree(p);
 271         return ret;
 272 }
 273
 274 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 275                                struct ib_cm_event *event)
 276 {
 277         struct ipoib_cm_rx *p;
 278         struct ipoib_dev_priv *priv;
 279         unsigned long flags;
 280         int ret;
 281
 282         switch (event->event) {
 283         case IB_CM_REQ_RECEIVED:
 284                 return ipoib_cm_req_handler(cm_id, event);
 285         case IB_CM_DREQ_RECEIVED:
 286                 p = cm_id->context;
 287                 ib_send_cm_drep(cm_id, NULL, 0);
 288                 /* Fall through */
 289         case IB_CM_REJ_RECEIVED:
 290                 p = cm_id->context;
 291                 priv = netdev_priv(p->dev);
 292                 spin_lock_irqsave(&priv->lock, flags);
 293                 if (list_empty(&p->list))
 294                         ret = 0; /* Connection is going away already. */
 295                 else {
 296                         list_del_init(&p->list);
 297                         ret = -ECONNRESET;
 298                 }
 299                 spin_unlock_irqrestore(&priv->lock, flags);
 300                 if (ret) {
 301                         ib_destroy_qp(p->qp);
 302                         kfree(p);
 303                         return ret;
 304                 }
 305                 return 0;
 306         default:
 307                 return 0;
 308         }
 309 }
 310 /* Adjust length of skb with fragments to match received data */
 311 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 312                           unsigned int length)
 313 {
 314         int i, num_frags;
 315         unsigned int size;
 316
 317         /* put header into skb */
 318         size = min(length, hdr_space);
 319         skb->tail += size;
 320         skb->len += size;
 321         length -= size;
 322
 323         num_frags = skb_shinfo(skb)->nr_frags;
 324         for (i = 0; i < num_frags; i++) {
 325                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 326
 327                 if (length == 0) {
 328                         /* don't need this page */
 329                         __free_page(frag->page);
 330                         --skb_shinfo(skb)->nr_frags;
 331                 } else {
 332                         size = min(length, (unsigned) PAGE_SIZE);
 333
 334                         frag->size = size;
 335                         skb->data_len += size;
 336                         skb->truesize += size;
 337                         skb->len += size;
 338                         length -= size;
 339                 }
 340         }
 341 }
 342
 343 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 344 {
 345         struct ipoib_dev_priv *priv = netdev_priv(dev);
 346         unsigned int wr_id = wc->wr_id & ~IPOIB_CM_OP_SRQ;
 347         struct sk_buff *skb;
 348         struct ipoib_cm_rx *p;
 349         unsigned long flags;
 350         u64 mapping[IPOIB_CM_RX_SG];
 351
 352         ipoib_dbg_data(priv, "cm recv completion: id %d, op %d, status: %d\n",
 353                        wr_id, wc->opcode, wc->status);
 354
 355         if (unlikely(wr_id >= ipoib_recvq_size)) {
 356                 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 357                            wr_id, ipoib_recvq_size);
 358                 return;
 359         }
 360
 361         skb  = priv->cm.srq_ring[wr_id].skb;
 362
 363         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 364                 ipoib_dbg(priv, "cm recv error "
 365                            "(status=%d, wrid=%d vend_err %x)\n",
 366                            wc->status, wr_id, wc->vendor_err);
 367                 ++priv->stats.rx_dropped;
 368                 goto repost;
 369         }
 370
 371         if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) {
 372                 p = wc->qp->qp_context;
 373                 if (time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 374                         spin_lock_irqsave(&priv->lock, flags);
 375                         p->jiffies = jiffies;
 376                         /* Move this entry to list head, but do
 377                          * not re-add it if it has been removed. */
 378                         if (!list_empty(&p->list))
 379                                 list_move(&p->list, &priv->cm.passive_ids);
 380                         spin_unlock_irqrestore(&priv->lock, flags);
 381                         queue_delayed_work(ipoib_workqueue,
 382                                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 383                 }
 384         }
 385
 386         if (unlikely(ipoib_cm_alloc_rx_skb(dev, wr_id, mapping))) {
 387                 /*
 388                  * If we can't allocate a new RX buffer, dump
 389                  * this packet and reuse the old buffer.
 390                  */
 391                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 392                 ++priv->stats.rx_dropped;
 393                 goto repost;
 394         }
 395
 396         ipoib_cm_dma_unmap_rx(priv, priv->cm.srq_ring[wr_id].mapping);
 397         memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, sizeof mapping);
 398
 399         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 400                        wc->byte_len, wc->slid);
 401
 402         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len);
 403
 404         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 405         skb->mac.raw = skb->data;
 406         skb_pull(skb, IPOIB_ENCAP_LEN);
 407
 408         dev->last_rx = jiffies;
 409         ++priv->stats.rx_packets;
 410         priv->stats.rx_bytes += skb->len;
 411
 412         skb->dev = dev;
 413         /* XXX get correct PACKET_ type here */
 414         skb->pkt_type = PACKET_HOST;
 415         netif_rx_ni(skb);
 416
 417 repost:
 418         if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
 419                 ipoib_warn(priv, "ipoib_cm_post_receive failed "
 420                            "for buf %d\n", wr_id);
 421 }
 422
 423 static inline int post_send(struct ipoib_dev_priv *priv,
 424                             struct ipoib_cm_tx *tx,
 425                             unsigned int wr_id,
 426                             u64 addr, int len)
 427 {
 428         struct ib_send_wr *bad_wr;
 429
 430         priv->tx_sge.addr             = addr;
 431         priv->tx_sge.length           = len;
 432
 433         priv->tx_wr.wr_id             = wr_id;
 434
 435         return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
 436 }
 437
 438 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 439 {
 440         struct ipoib_dev_priv *priv = netdev_priv(dev);
 441         struct ipoib_tx_buf *tx_req;
 442         u64 addr;
 443
 444         if (unlikely(skb->len > tx->mtu)) {
 445                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 446                            skb->len, tx->mtu);
 447                 ++priv->stats.tx_dropped;
 448                 ++priv->stats.tx_errors;
 449                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - INFINIBAND_ALEN);
 450                 return;
 451         }
 452
 453         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 454                        tx->tx_head, skb->len, tx->qp->qp_num);
 455
 456         /*
 457          * We put the skb into the tx_ring _before_ we call post_send()
 458          * because it's entirely possible that the completion handler will
 459          * run before we execute anything after the post_send().  That
 460          * means we have to make sure everything is properly recorded and
 461          * our state is consistent before we call post_send().
 462          */
 463         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 464         tx_req->skb = skb;
 465         addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
 466         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 467                 ++priv->stats.tx_errors;
 468                 dev_kfree_skb_any(skb);
 469                 return;
 470         }
 471
 472         tx_req->mapping = addr;
 473
 474         if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
 475                                 addr, skb->len))) {
 476                 ipoib_warn(priv, "post_send failed\n");
 477                 ++priv->stats.tx_errors;
 478                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
 479                 dev_kfree_skb_any(skb);
 480         } else {
 481                 dev->trans_start = jiffies;
 482                 ++tx->tx_head;
 483
 484                 if (tx->tx_head - tx->tx_tail == ipoib_sendq_size) {
 485                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 486                                   tx->qp->qp_num);
 487                         netif_stop_queue(dev);
 488                         set_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
 489                 }
 490         }
 491 }
 492
 493 static void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ipoib_cm_tx *tx,
 494                                   struct ib_wc *wc)
 495 {
 496         struct ipoib_dev_priv *priv = netdev_priv(dev);
 497         unsigned int wr_id = wc->wr_id;
 498         struct ipoib_tx_buf *tx_req;
 499         unsigned long flags;
 500
 501         ipoib_dbg_data(priv, "cm send completion: id %d, op %d, status: %d\n",
 502                        wr_id, wc->opcode, wc->status);
 503
 504         if (unlikely(wr_id >= ipoib_sendq_size)) {
 505                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 506                            wr_id, ipoib_sendq_size);
 507                 return;
 508         }
 509
 510         tx_req = &tx->tx_ring[wr_id];
 511
 512         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
 513
 514         /* FIXME: is this right? Shouldn't we only increment on success? */
 515         ++priv->stats.tx_packets;
 516         priv->stats.tx_bytes += tx_req->skb->len;
 517
 518         dev_kfree_skb_any(tx_req->skb);
 519
 520         spin_lock_irqsave(&priv->tx_lock, flags);
 521         ++tx->tx_tail;
 522         if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) &&
 523             tx->tx_head - tx->tx_tail <= ipoib_sendq_size >> 1) {
 524                 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
 525                 netif_wake_queue(dev);
 526         }
 527
 528         if (wc->status != IB_WC_SUCCESS &&
 529             wc->status != IB_WC_WR_FLUSH_ERR) {
 530                 struct ipoib_neigh *neigh;
 531
 532                 ipoib_dbg(priv, "failed cm send event "
 533                            "(status=%d, wrid=%d vend_err %x)\n",
 534                            wc->status, wr_id, wc->vendor_err);
 535
 536                 spin_lock(&priv->lock);
 537                 neigh = tx->neigh;
 538
 539                 if (neigh) {
 540                         neigh->cm = NULL;
 541                         list_del(&neigh->list);
 542                         if (neigh->ah)
 543                                 ipoib_put_ah(neigh->ah);
 544                         ipoib_neigh_free(dev, neigh);
 545
 546                         tx->neigh = NULL;
 547                 }
 548
 549                 /* queue would be re-started anyway when TX is destroyed,
 550                  * but it makes sense to do it ASAP here. */
 551                 if (test_and_clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags))
 552                         netif_wake_queue(dev);
 553
 554                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 555                         list_move(&tx->list, &priv->cm.reap_list);
 556                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 557                 }
 558
 559                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 560
 561                 spin_unlock(&priv->lock);
 562         }
 563
 564         spin_unlock_irqrestore(&priv->tx_lock, flags);
 565 }
 566
 567 static void ipoib_cm_tx_completion(struct ib_cq *cq, void *tx_ptr)
 568 {
 569         struct ipoib_cm_tx *tx = tx_ptr;
 570         int n, i;
 571
 572         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 573         do {
 574                 n = ib_poll_cq(cq, IPOIB_NUM_WC, tx->ibwc);
 575                 for (i = 0; i < n; ++i)
 576                         ipoib_cm_handle_tx_wc(tx->dev, tx, tx->ibwc + i);
 577         } while (n == IPOIB_NUM_WC);
 578 }
 579
 580 int ipoib_cm_dev_open(struct net_device *dev)
 581 {
 582         struct ipoib_dev_priv *priv = netdev_priv(dev);
 583         int ret;
 584
 585         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 586                 return 0;
 587
 588         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 589         if (IS_ERR(priv->cm.id)) {
 590                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 591                 return IS_ERR(priv->cm.id);
 592         }
 593
 594         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 595                            0, NULL);
 596         if (ret) {
 597                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 598                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 599                 ib_destroy_cm_id(priv->cm.id);
 600                 return ret;
 601         }
 602         return 0;
 603 }
 604
 605 void ipoib_cm_dev_stop(struct net_device *dev)
 606 {
 607         struct ipoib_dev_priv *priv = netdev_priv(dev);
 608         struct ipoib_cm_rx *p;
 609         unsigned long flags;
 610
 611         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 612                 return;
 613
 614         ib_destroy_cm_id(priv->cm.id);
 615         spin_lock_irqsave(&priv->lock, flags);
 616         while (!list_empty(&priv->cm.passive_ids)) {
 617                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 618                 list_del_init(&p->list);
 619                 spin_unlock_irqrestore(&priv->lock, flags);
 620                 ib_destroy_cm_id(p->id);
 621                 ib_destroy_qp(p->qp);
 622                 kfree(p);
 623                 spin_lock_irqsave(&priv->lock, flags);
 624         }
 625         spin_unlock_irqrestore(&priv->lock, flags);
 626
 627         cancel_delayed_work(&priv->cm.stale_task);
 628 }
 629
 630 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 631 {
 632         struct ipoib_cm_tx *p = cm_id->context;
 633         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 634         struct ipoib_cm_data *data = event->private_data;
 635         struct sk_buff_head skqueue;
 636         struct ib_qp_attr qp_attr;
 637         int qp_attr_mask, ret;
 638         struct sk_buff *skb;
 639         unsigned long flags;
 640
 641         p->mtu = be32_to_cpu(data->mtu);
 642
 643         if (p->mtu < priv->dev->mtu + IPOIB_ENCAP_LEN) {
 644                 ipoib_warn(priv, "Rejecting connection: mtu %d < device mtu %d + 4\n",
 645                            p->mtu, priv->dev->mtu);
 646                 return -EINVAL;
 647         }
 648
 649         qp_attr.qp_state = IB_QPS_RTR;
 650         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 651         if (ret) {
 652                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 653                 return ret;
 654         }
 655
 656         qp_attr.rq_psn = 0 /* FIXME */;
 657         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 658         if (ret) {
 659                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 660                 return ret;
 661         }
 662
 663         qp_attr.qp_state = IB_QPS_RTS;
 664         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 665         if (ret) {
 666                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 667                 return ret;
 668         }
 669         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 670         if (ret) {
 671                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 672                 return ret;
 673         }
 674
 675         skb_queue_head_init(&skqueue);
 676
 677         spin_lock_irqsave(&priv->lock, flags);
 678         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 679         if (p->neigh)
 680                 while ((skb = __skb_dequeue(&p->neigh->queue)))
 681                         __skb_queue_tail(&skqueue, skb);
 682         spin_unlock_irqrestore(&priv->lock, flags);
 683
 684         while ((skb = __skb_dequeue(&skqueue))) {
 685                 skb->dev = p->dev;
 686                 if (dev_queue_xmit(skb))
 687                         ipoib_warn(priv, "dev_queue_xmit failed "
 688                                    "to requeue packet\n");
 689         }
 690
 691         ret = ib_send_cm_rtu(cm_id, NULL, 0);
 692         if (ret) {
 693                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
 694                 return ret;
 695         }
 696         return 0;
 697 }
 698
 699 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ib_cq *cq)
 700 {
 701         struct ipoib_dev_priv *priv = netdev_priv(dev);
 702         struct ib_qp_init_attr attr = {};
 703         attr.recv_cq = priv->cq;
 704         attr.srq = priv->cm.srq;
 705         attr.cap.max_send_wr = ipoib_sendq_size;
 706         attr.cap.max_send_sge = 1;
 707         attr.sq_sig_type = IB_SIGNAL_ALL_WR;
 708         attr.qp_type = IB_QPT_RC;
 709         attr.send_cq = cq;
 710         return ib_create_qp(priv->pd, &attr);
 711 }
 712
 713 static int ipoib_cm_send_req(struct net_device *dev,
 714                              struct ib_cm_id *id, struct ib_qp *qp,
 715                              u32 qpn,
 716                              struct ib_sa_path_rec *pathrec)
 717 {
 718         struct ipoib_dev_priv *priv = netdev_priv(dev);
 719         struct ipoib_cm_data data = {};
 720         struct ib_cm_req_param req = {};
 721
 722         data.qpn = cpu_to_be32(priv->qp->qp_num);
 723         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 724
 725         req.primary_path              = pathrec;
 726         req.alternate_path            = NULL;
 727         req.service_id                = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
 728         req.qp_num                    = qp->qp_num;
 729         req.qp_type                   = qp->qp_type;
 730         req.private_data              = &data;
 731         req.private_data_len          = sizeof data;
 732         req.flow_control              = 0;
 733
 734         req.starting_psn              = 0; /* FIXME */
 735
 736         /*
 737          * Pick some arbitrary defaults here; we could make these
 738          * module parameters if anyone cared about setting them.
 739          */
 740         req.responder_resources       = 4;
 741         req.remote_cm_response_timeout = 20;
 742         req.local_cm_response_timeout  = 20;
 743         req.retry_count               = 0; /* RFC draft warns against retries */
 744         req.rnr_retry_count           = 0; /* RFC draft warns against retries */
 745         req.max_cm_retries            = 15;
 746         req.srq                       = 1;
 747         return ib_send_cm_req(id, &req);
 748 }
 749
 750 static int ipoib_cm_modify_tx_init(struct net_device *dev,
 751                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
 752 {
 753         struct ipoib_dev_priv *priv = netdev_priv(dev);
 754         struct ib_qp_attr qp_attr;
 755         int qp_attr_mask, ret;
 756         ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
 757         if (ret) {
 758                 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
 759                 return ret;
 760         }
 761
 762         qp_attr.qp_state = IB_QPS_INIT;
 763         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 764         qp_attr.port_num = priv->port;
 765         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
 766
 767         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 768         if (ret) {
 769                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
 770                 return ret;
 771         }
 772         return 0;
 773 }
 774
 775 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
 776                             struct ib_sa_path_rec *pathrec)
 777 {
 778         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 779         int ret;
 780
 781         p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
 782                                 GFP_KERNEL);
 783         if (!p->tx_ring) {
 784                 ipoib_warn(priv, "failed to allocate tx ring\n");
 785                 ret = -ENOMEM;
 786                 goto err_tx;
 787         }
 788
 789         p->cq = ib_create_cq(priv->ca, ipoib_cm_tx_completion, NULL, p,
 790                              ipoib_sendq_size + 1);
 791         if (IS_ERR(p->cq)) {
 792                 ret = PTR_ERR(p->cq);
 793                 ipoib_warn(priv, "failed to allocate tx cq: %d\n", ret);
 794                 goto err_cq;
 795         }
 796
 797         ret = ib_req_notify_cq(p->cq, IB_CQ_NEXT_COMP);
 798         if (ret) {
 799                 ipoib_warn(priv, "failed to request completion notification: %d\n", ret);
 800                 goto err_req_notify;
 801         }
 802
 803         p->qp = ipoib_cm_create_tx_qp(p->dev, p->cq);
 804         if (IS_ERR(p->qp)) {
 805                 ret = PTR_ERR(p->qp);
 806                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
 807                 goto err_qp;
 808         }
 809
 810         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
 811         if (IS_ERR(p->id)) {
 812                 ret = PTR_ERR(p->id);
 813                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
 814                 goto err_id;
 815         }
 816
 817         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
 818         if (ret) {
 819                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
 820                 goto err_modify;
 821         }
 822
 823         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
 824         if (ret) {
 825                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
 826                 goto err_send_cm;
 827         }
 828
 829         ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
 830                   p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
 831
 832         return 0;
 833
 834 err_send_cm:
 835 err_modify:
 836         ib_destroy_cm_id(p->id);
 837 err_id:
 838         p->id = NULL;
 839         ib_destroy_qp(p->qp);
 840 err_req_notify:
 841 err_qp:
 842         p->qp = NULL;
 843         ib_destroy_cq(p->cq);
 844 err_cq:
 845         p->cq = NULL;
 846 err_tx:
 847         return ret;
 848 }
 849
 850 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
 851 {
 852         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 853         struct ipoib_tx_buf *tx_req;
 854
 855         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
 856                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
 857
 858         if (p->id)
 859                 ib_destroy_cm_id(p->id);
 860
 861         if (p->qp)
 862                 ib_destroy_qp(p->qp);
 863
 864         if (p->cq)
 865                 ib_destroy_cq(p->cq);
 866
 867         if (test_bit(IPOIB_FLAG_NETIF_STOPPED, &p->flags))
 868                 netif_wake_queue(p->dev);
 869
 870         if (p->tx_ring) {
 871                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
 872                         tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
 873                         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
 874                                          DMA_TO_DEVICE);
 875                         dev_kfree_skb_any(tx_req->skb);
 876                         ++p->tx_tail;
 877                 }
 878
 879                 kfree(p->tx_ring);
 880         }
 881
 882         kfree(p);
 883 }
 884
 885 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
 886                                struct ib_cm_event *event)
 887 {
 888         struct ipoib_cm_tx *tx = cm_id->context;
 889         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
 890         struct net_device *dev = priv->dev;
 891         struct ipoib_neigh *neigh;
 892         unsigned long flags;
 893         int ret;
 894
 895         switch (event->event) {
 896         case IB_CM_DREQ_RECEIVED:
 897                 ipoib_dbg(priv, "DREQ received.\n");
 898                 ib_send_cm_drep(cm_id, NULL, 0);
 899                 break;
 900         case IB_CM_REP_RECEIVED:
 901                 ipoib_dbg(priv, "REP received.\n");
 902                 ret = ipoib_cm_rep_handler(cm_id, event);
 903                 if (ret)
 904                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 905                                        NULL, 0, NULL, 0);
 906                 break;
 907         case IB_CM_REQ_ERROR:
 908         case IB_CM_REJ_RECEIVED:
 909         case IB_CM_TIMEWAIT_EXIT:
 910                 ipoib_dbg(priv, "CM error %d.\n", event->event);
 911                 spin_lock_irqsave(&priv->tx_lock, flags);
 912                 spin_lock(&priv->lock);
 913                 neigh = tx->neigh;
 914
 915                 if (neigh) {
 916                         neigh->cm = NULL;
 917                         list_del(&neigh->list);
 918                         if (neigh->ah)
 919                                 ipoib_put_ah(neigh->ah);
 920                         ipoib_neigh_free(dev, neigh);
 921
 922                         tx->neigh = NULL;
 923                 }
 924
 925                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 926                         list_move(&tx->list, &priv->cm.reap_list);
 927                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 928                 }
 929
 930                 spin_unlock(&priv->lock);
 931                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 932                 break;
 933         default:
 934                 break;
 935         }
 936
 937         return 0;
 938 }
 939
 940 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
 941                                        struct ipoib_neigh *neigh)
 942 {
 943         struct ipoib_dev_priv *priv = netdev_priv(dev);
 944         struct ipoib_cm_tx *tx;
 945
 946         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
 947         if (!tx)
 948                 return NULL;
 949
 950         neigh->cm = tx;
 951         tx->neigh = neigh;
 952         tx->path = path;
 953         tx->dev = dev;
 954         list_add(&tx->list, &priv->cm.start_list);
 955         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
 956         queue_work(ipoib_workqueue, &priv->cm.start_task);
 957         return tx;
 958 }
 959
 960 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
 961 {
 962         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
 963         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 964                 list_move(&tx->list, &priv->cm.reap_list);
 965                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
 966                 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
 967                           IPOIB_GID_ARG(tx->neigh->dgid));
 968                 tx->neigh = NULL;
 969         }
 970 }
 971
 972 static void ipoib_cm_tx_start(struct work_struct *work)
 973 {
 974         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 975                                                    cm.start_task);
 976         struct net_device *dev = priv->dev;
 977         struct ipoib_neigh *neigh;
 978         struct ipoib_cm_tx *p;
 979         unsigned long flags;
 980         int ret;
 981
 982         struct ib_sa_path_rec pathrec;
 983         u32 qpn;
 984
 985         spin_lock_irqsave(&priv->tx_lock, flags);
 986         spin_lock(&priv->lock);
 987         while (!list_empty(&priv->cm.start_list)) {
 988                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
 989                 list_del_init(&p->list);
 990                 neigh = p->neigh;
 991                 qpn = IPOIB_QPN(neigh->neighbour->ha);
 992                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
 993                 spin_unlock(&priv->lock);
 994                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 995                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
 996                 spin_lock_irqsave(&priv->tx_lock, flags);
 997                 spin_lock(&priv->lock);
 998                 if (ret) {
 999                         neigh = p->neigh;
1000                         if (neigh) {
1001                                 neigh->cm = NULL;
1002                                 list_del(&neigh->list);
1003                                 if (neigh->ah)
1004                                         ipoib_put_ah(neigh->ah);
1005                                 ipoib_neigh_free(dev, neigh);
1006                         }
1007                         list_del(&p->list);
1008                         kfree(p);
1009                 }
1010         }
1011         spin_unlock(&priv->lock);
1012         spin_unlock_irqrestore(&priv->tx_lock, flags);
1013 }
1014
1015 static void ipoib_cm_tx_reap(struct work_struct *work)
1016 {
1017         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1018                                                    cm.reap_task);
1019         struct ipoib_cm_tx *p;
1020         unsigned long flags;
1021
1022         spin_lock_irqsave(&priv->tx_lock, flags);
1023         spin_lock(&priv->lock);
1024         while (!list_empty(&priv->cm.reap_list)) {
1025                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1026                 list_del(&p->list);
1027                 spin_unlock(&priv->lock);
1028                 spin_unlock_irqrestore(&priv->tx_lock, flags);
1029                 ipoib_cm_tx_destroy(p);
1030                 spin_lock_irqsave(&priv->tx_lock, flags);
1031                 spin_lock(&priv->lock);
1032         }
1033         spin_unlock(&priv->lock);
1034         spin_unlock_irqrestore(&priv->tx_lock, flags);
1035 }
1036
1037 static void ipoib_cm_skb_reap(struct work_struct *work)
1038 {
1039         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1040                                                    cm.skb_task);
1041         struct net_device *dev = priv->dev;
1042         struct sk_buff *skb;
1043         unsigned long flags;
1044
1045         unsigned mtu = priv->mcast_mtu;
1046
1047         spin_lock_irqsave(&priv->tx_lock, flags);
1048         spin_lock(&priv->lock);
1049         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1050                 spin_unlock(&priv->lock);
1051                 spin_unlock_irqrestore(&priv->tx_lock, flags);
1052                 if (skb->protocol == htons(ETH_P_IP))
1053                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1054 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1055                 else if (skb->protocol == htons(ETH_P_IPV6))
1056                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
1057 #endif
1058                 dev_kfree_skb_any(skb);
1059                 spin_lock_irqsave(&priv->tx_lock, flags);
1060                 spin_lock(&priv->lock);
1061         }
1062         spin_unlock(&priv->lock);
1063         spin_unlock_irqrestore(&priv->tx_lock, flags);
1064 }
1065
1066 void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
1067                            unsigned int mtu)
1068 {
1069         struct ipoib_dev_priv *priv = netdev_priv(dev);
1070         int e = skb_queue_empty(&priv->cm.skb_queue);
1071
1072         if (skb->dst)
1073                 skb->dst->ops->update_pmtu(skb->dst, mtu);
1074
1075         skb_queue_tail(&priv->cm.skb_queue, skb);
1076         if (e)
1077                 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1078 }
1079
1080 static void ipoib_cm_stale_task(struct work_struct *work)
1081 {
1082         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1083                                                    cm.stale_task.work);
1084         struct ipoib_cm_rx *p;
1085         unsigned long flags;
1086
1087         spin_lock_irqsave(&priv->lock, flags);
1088         while (!list_empty(&priv->cm.passive_ids)) {
1089                 /* List if sorted by LRU, start from tail,
1090                  * stop when we see a recently used entry */
1091                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1092                 if (time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1093                         break;
1094                 list_del_init(&p->list);
1095                 spin_unlock_irqrestore(&priv->lock, flags);
1096                 ib_destroy_cm_id(p->id);
1097                 ib_destroy_qp(p->qp);
1098                 kfree(p);
1099                 spin_lock_irqsave(&priv->lock, flags);
1100         }
1101         spin_unlock_irqrestore(&priv->lock, flags);
1102 }
1103
1104
1105 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1106                          char *buf)
1107 {
1108         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1109
1110         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1111                 return sprintf(buf, "connected\n");
1112         else
1113                 return sprintf(buf, "datagram\n");
1114 }
1115
1116 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1117                         const char *buf, size_t count)
1118 {
1119         struct net_device *dev = to_net_dev(d);
1120         struct ipoib_dev_priv *priv = netdev_priv(dev);
1121
1122         /* flush paths if we switch modes so that connections are restarted */
1123         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1124                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1125                 ipoib_warn(priv, "enabling connected mode "
1126                            "will cause multicast packet drops\n");
1127                 ipoib_flush_paths(dev);
1128                 return count;
1129         }
1130
1131         if (!strcmp(buf, "datagram\n")) {
1132                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1133                 dev->mtu = min(priv->mcast_mtu, dev->mtu);
1134                 ipoib_flush_paths(dev);
1135                 return count;
1136         }
1137
1138         return -EINVAL;
1139 }
1140
1141 static DEVICE_ATTR(mode, S_IWUGO | S_IRUGO, show_mode, set_mode);
1142
1143 int ipoib_cm_add_mode_attr(struct net_device *dev)
1144 {
1145         return device_create_file(&dev->dev, &dev_attr_mode);
1146 }
1147
1148 int ipoib_cm_dev_init(struct net_device *dev)
1149 {
1150         struct ipoib_dev_priv *priv = netdev_priv(dev);
1151         struct ib_srq_init_attr srq_init_attr = {
1152                 .attr = {
1153                         .max_wr  = ipoib_recvq_size,
1154                         .max_sge = IPOIB_CM_RX_SG
1155                 }
1156         };
1157         int ret, i;
1158
1159         INIT_LIST_HEAD(&priv->cm.passive_ids);
1160         INIT_LIST_HEAD(&priv->cm.reap_list);
1161         INIT_LIST_HEAD(&priv->cm.start_list);
1162         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1163         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1164         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1165         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1166
1167         skb_queue_head_init(&priv->cm.skb_queue);
1168
1169         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1170         if (IS_ERR(priv->cm.srq)) {
1171                 ret = PTR_ERR(priv->cm.srq);
1172                 priv->cm.srq = NULL;
1173                 return ret;
1174         }
1175
1176         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1177                                     GFP_KERNEL);
1178         if (!priv->cm.srq_ring) {
1179                 printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
1180                        priv->ca->name, ipoib_recvq_size);
1181                 ipoib_cm_dev_cleanup(dev);
1182                 return -ENOMEM;
1183         }
1184
1185         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
1186                 priv->cm.rx_sge[i].lkey = priv->mr->lkey;
1187
1188         priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
1189         for (i = 1; i < IPOIB_CM_RX_SG; ++i)
1190                 priv->cm.rx_sge[i].length = PAGE_SIZE;
1191         priv->cm.rx_wr.next = NULL;
1192         priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
1193         priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;
1194
1195         for (i = 0; i < ipoib_recvq_size; ++i) {
1196                 if (ipoib_cm_alloc_rx_skb(dev, i, priv->cm.srq_ring[i].mapping)) {
1197                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
1198                         ipoib_cm_dev_cleanup(dev);
1199                         return -ENOMEM;
1200                 }
1201                 if (ipoib_cm_post_receive(dev, i)) {
1202                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
1203                         ipoib_cm_dev_cleanup(dev);
1204                         return -EIO;
1205                 }
1206         }
1207
1208         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1209         return 0;
1210 }
1211
1212 void ipoib_cm_dev_cleanup(struct net_device *dev)
1213 {
1214         struct ipoib_dev_priv *priv = netdev_priv(dev);
1215         int i, ret;
1216
1217         if (!priv->cm.srq)
1218                 return;
1219
1220         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1221
1222         ret = ib_destroy_srq(priv->cm.srq);
1223         if (ret)
1224                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1225
1226         priv->cm.srq = NULL;
1227         if (!priv->cm.srq_ring)
1228                 return;
1229         for (i = 0; i < ipoib_recvq_size; ++i)
1230                 if (priv->cm.srq_ring[i].skb) {
1231                         ipoib_cm_dma_unmap_rx(priv, priv->cm.srq_ring[i].mapping);
1232                         dev_kfree_skb_any(priv->cm.srq_ring[i].skb);
1233                         priv->cm.srq_ring[i].skb = NULL;
1234                 }
1235         kfree(priv->cm.srq_ring);
1236         priv->cm.srq_ring = NULL;
1237 }