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, int frags,
  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 < frags; ++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, IPOIB_CM_RX_SG - 1,
  94                                       priv->cm.srq_ring[id].mapping);
  95                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
  96                 priv->cm.srq_ring[id].skb = NULL;
  97         }
  98
  99         return ret;
 100 }
 101
 102 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags,
 103                                              u64 mapping[IPOIB_CM_RX_SG])
 104 {
 105         struct ipoib_dev_priv *priv = netdev_priv(dev);
 106         struct sk_buff *skb;
 107         int i;
 108
 109         skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
 110         if (unlikely(!skb))
 111                 return NULL;
 112
 113         /*
 114          * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
 115          * IP header to a multiple of 16.
 116          */
 117         skb_reserve(skb, 12);
 118
 119         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 120                                        DMA_FROM_DEVICE);
 121         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 122                 dev_kfree_skb_any(skb);
 123                 return NULL;
 124         }
 125
 126         for (i = 0; i < frags; i++) {
 127                 struct page *page = alloc_page(GFP_ATOMIC);
 128
 129                 if (!page)
 130                         goto partial_error;
 131                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 132
 133                 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
 134                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
 135                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 136                         goto partial_error;
 137         }
 138
 139         priv->cm.srq_ring[id].skb = skb;
 140         return skb;
 141
 142 partial_error:
 143
 144         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 145
 146         for (; i >= 0; --i)
 147                 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
 148
 149         dev_kfree_skb_any(skb);
 150         return NULL;
 151 }
 152
 153 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 154                                            struct ipoib_cm_rx *p)
 155 {
 156         struct ipoib_dev_priv *priv = netdev_priv(dev);
 157         struct ib_qp_init_attr attr = {
 158                 .send_cq = priv->cq, /* does not matter, we never send anything */
 159                 .recv_cq = priv->cq,
 160                 .srq = priv->cm.srq,
 161                 .cap.max_send_wr = 1, /* FIXME: 0 Seems not to work */
 162                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 163                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 164                 .qp_type = IB_QPT_RC,
 165                 .qp_context = p,
 166         };
 167         return ib_create_qp(priv->pd, &attr);
 168 }
 169
 170 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 171                                   struct ib_cm_id *cm_id, struct ib_qp *qp,
 172                                   unsigned psn)
 173 {
 174         struct ipoib_dev_priv *priv = netdev_priv(dev);
 175         struct ib_qp_attr qp_attr;
 176         int qp_attr_mask, ret;
 177
 178         qp_attr.qp_state = IB_QPS_INIT;
 179         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 180         if (ret) {
 181                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 182                 return ret;
 183         }
 184         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 185         if (ret) {
 186                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 187                 return ret;
 188         }
 189         qp_attr.qp_state = IB_QPS_RTR;
 190         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 191         if (ret) {
 192                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 193                 return ret;
 194         }
 195         qp_attr.rq_psn = psn;
 196         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 197         if (ret) {
 198                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 199                 return ret;
 200         }
 201         return 0;
 202 }
 203
 204 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 205                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 206                              unsigned psn)
 207 {
 208         struct ipoib_dev_priv *priv = netdev_priv(dev);
 209         struct ipoib_cm_data data = {};
 210         struct ib_cm_rep_param rep = {};
 211
 212         data.qpn = cpu_to_be32(priv->qp->qp_num);
 213         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 214
 215         rep.private_data = &data;
 216         rep.private_data_len = sizeof data;
 217         rep.flow_control = 0;
 218         rep.rnr_retry_count = req->rnr_retry_count;
 219         rep.target_ack_delay = 20; /* FIXME */
 220         rep.srq = 1;
 221         rep.qp_num = qp->qp_num;
 222         rep.starting_psn = psn;
 223         return ib_send_cm_rep(cm_id, &rep);
 224 }
 225
 226 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 227 {
 228         struct net_device *dev = cm_id->context;
 229         struct ipoib_dev_priv *priv = netdev_priv(dev);
 230         struct ipoib_cm_rx *p;
 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_irq(&priv->lock);
 260         if (list_empty(&priv->cm.passive_ids))
 261                 queue_delayed_work(ipoib_workqueue,
 262                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 263         list_add(&p->list, &priv->cm.passive_ids);
 264         spin_unlock_irq(&priv->lock);
 265         return 0;
 266
 267 err_rep:
 268 err_modify:
 269         ib_destroy_qp(p->qp);
 270 err_qp:
 271         kfree(p);
 272         return ret;
 273 }
 274
 275 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 276                                struct ib_cm_event *event)
 277 {
 278         struct ipoib_cm_rx *p;
 279         struct ipoib_dev_priv *priv;
 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_irq(&priv->lock);
 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_irq(&priv->lock);
 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, struct sk_buff *toskb)
 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                         skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
 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, *newskb;
 348         struct ipoib_cm_rx *p;
 349         unsigned long flags;
 350         u64 mapping[IPOIB_CM_RX_SG];
 351         int frags;
 352
 353         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 354                        wr_id, wc->status);
 355
 356         if (unlikely(wr_id >= ipoib_recvq_size)) {
 357                 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 358                            wr_id, ipoib_recvq_size);
 359                 return;
 360         }
 361
 362         skb  = priv->cm.srq_ring[wr_id].skb;
 363
 364         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 365                 ipoib_dbg(priv, "cm recv error "
 366                            "(status=%d, wrid=%d vend_err %x)\n",
 367                            wc->status, wr_id, wc->vendor_err);
 368                 ++priv->stats.rx_dropped;
 369                 goto repost;
 370         }
 371
 372         if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) {
 373                 p = wc->qp->qp_context;
 374                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 375                         spin_lock_irqsave(&priv->lock, flags);
 376                         p->jiffies = jiffies;
 377                         /* Move this entry to list head, but do
 378                          * not re-add it if it has been removed. */
 379                         if (!list_empty(&p->list))
 380                                 list_move(&p->list, &priv->cm.passive_ids);
 381                         spin_unlock_irqrestore(&priv->lock, flags);
 382                 }
 383         }
 384
 385         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
 386                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
 387
 388         newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping);
 389         if (unlikely(!newskb)) {
 390                 /*
 391                  * If we can't allocate a new RX buffer, dump
 392                  * this packet and reuse the old buffer.
 393                  */
 394                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 395                 ++priv->stats.rx_dropped;
 396                 goto repost;
 397         }
 398
 399         ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping);
 400         memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
 401
 402         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 403                        wc->byte_len, wc->slid);
 404
 405         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 406
 407         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 408         skb_reset_mac_header(skb);
 409         skb_pull(skb, IPOIB_ENCAP_LEN);
 410
 411         dev->last_rx = jiffies;
 412         ++priv->stats.rx_packets;
 413         priv->stats.rx_bytes += skb->len;
 414
 415         skb->dev = dev;
 416         /* XXX get correct PACKET_ type here */
 417         skb->pkt_type = PACKET_HOST;
 418         netif_receive_skb(skb);
 419
 420 repost:
 421         if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
 422                 ipoib_warn(priv, "ipoib_cm_post_receive failed "
 423                            "for buf %d\n", wr_id);
 424 }
 425
 426 static inline int post_send(struct ipoib_dev_priv *priv,
 427                             struct ipoib_cm_tx *tx,
 428                             unsigned int wr_id,
 429                             u64 addr, int len)
 430 {
 431         struct ib_send_wr *bad_wr;
 432
 433         priv->tx_sge.addr             = addr;
 434         priv->tx_sge.length           = len;
 435
 436         priv->tx_wr.wr_id             = wr_id;
 437
 438         return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
 439 }
 440
 441 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 442 {
 443         struct ipoib_dev_priv *priv = netdev_priv(dev);
 444         struct ipoib_tx_buf *tx_req;
 445         u64 addr;
 446
 447         if (unlikely(skb->len > tx->mtu)) {
 448                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 449                            skb->len, tx->mtu);
 450                 ++priv->stats.tx_dropped;
 451                 ++priv->stats.tx_errors;
 452                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 453                 return;
 454         }
 455
 456         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 457                        tx->tx_head, skb->len, tx->qp->qp_num);
 458
 459         /*
 460          * We put the skb into the tx_ring _before_ we call post_send()
 461          * because it's entirely possible that the completion handler will
 462          * run before we execute anything after the post_send().  That
 463          * means we have to make sure everything is properly recorded and
 464          * our state is consistent before we call post_send().
 465          */
 466         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 467         tx_req->skb = skb;
 468         addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
 469         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 470                 ++priv->stats.tx_errors;
 471                 dev_kfree_skb_any(skb);
 472                 return;
 473         }
 474
 475         tx_req->mapping = addr;
 476
 477         if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
 478                                 addr, skb->len))) {
 479                 ipoib_warn(priv, "post_send failed\n");
 480                 ++priv->stats.tx_errors;
 481                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
 482                 dev_kfree_skb_any(skb);
 483         } else {
 484                 dev->trans_start = jiffies;
 485                 ++tx->tx_head;
 486
 487                 if (tx->tx_head - tx->tx_tail == ipoib_sendq_size) {
 488                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 489                                   tx->qp->qp_num);
 490                         netif_stop_queue(dev);
 491                         set_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
 492                 }
 493         }
 494 }
 495
 496 static void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ipoib_cm_tx *tx,
 497                                   struct ib_wc *wc)
 498 {
 499         struct ipoib_dev_priv *priv = netdev_priv(dev);
 500         unsigned int wr_id = wc->wr_id;
 501         struct ipoib_tx_buf *tx_req;
 502         unsigned long flags;
 503
 504         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 505                        wr_id, wc->status);
 506
 507         if (unlikely(wr_id >= ipoib_sendq_size)) {
 508                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 509                            wr_id, ipoib_sendq_size);
 510                 return;
 511         }
 512
 513         tx_req = &tx->tx_ring[wr_id];
 514
 515         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
 516
 517         /* FIXME: is this right? Shouldn't we only increment on success? */
 518         ++priv->stats.tx_packets;
 519         priv->stats.tx_bytes += tx_req->skb->len;
 520
 521         dev_kfree_skb_any(tx_req->skb);
 522
 523         spin_lock_irqsave(&priv->tx_lock, flags);
 524         ++tx->tx_tail;
 525         if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) &&
 526             tx->tx_head - tx->tx_tail <= ipoib_sendq_size >> 1) {
 527                 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
 528                 netif_wake_queue(dev);
 529         }
 530
 531         if (wc->status != IB_WC_SUCCESS &&
 532             wc->status != IB_WC_WR_FLUSH_ERR) {
 533                 struct ipoib_neigh *neigh;
 534
 535                 ipoib_dbg(priv, "failed cm send event "
 536                            "(status=%d, wrid=%d vend_err %x)\n",
 537                            wc->status, wr_id, wc->vendor_err);
 538
 539                 spin_lock(&priv->lock);
 540                 neigh = tx->neigh;
 541
 542                 if (neigh) {
 543                         neigh->cm = NULL;
 544                         list_del(&neigh->list);
 545                         if (neigh->ah)
 546                                 ipoib_put_ah(neigh->ah);
 547                         ipoib_neigh_free(dev, neigh);
 548
 549                         tx->neigh = NULL;
 550                 }
 551
 552                 /* queue would be re-started anyway when TX is destroyed,
 553                  * but it makes sense to do it ASAP here. */
 554                 if (test_and_clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags))
 555                         netif_wake_queue(dev);
 556
 557                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 558                         list_move(&tx->list, &priv->cm.reap_list);
 559                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 560                 }
 561
 562                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 563
 564                 spin_unlock(&priv->lock);
 565         }
 566
 567         spin_unlock_irqrestore(&priv->tx_lock, flags);
 568 }
 569
 570 static void ipoib_cm_tx_completion(struct ib_cq *cq, void *tx_ptr)
 571 {
 572         struct ipoib_cm_tx *tx = tx_ptr;
 573         int n, i;
 574
 575         ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 576         do {
 577                 n = ib_poll_cq(cq, IPOIB_NUM_WC, tx->ibwc);
 578                 for (i = 0; i < n; ++i)
 579                         ipoib_cm_handle_tx_wc(tx->dev, tx, tx->ibwc + i);
 580         } while (n == IPOIB_NUM_WC);
 581 }
 582
 583 int ipoib_cm_dev_open(struct net_device *dev)
 584 {
 585         struct ipoib_dev_priv *priv = netdev_priv(dev);
 586         int ret;
 587
 588         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 589                 return 0;
 590
 591         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 592         if (IS_ERR(priv->cm.id)) {
 593                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 594                 ret = PTR_ERR(priv->cm.id);
 595                 priv->cm.id = NULL;
 596                 return ret;
 597         }
 598
 599         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 600                            0, NULL);
 601         if (ret) {
 602                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 603                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 604                 ib_destroy_cm_id(priv->cm.id);
 605                 priv->cm.id = NULL;
 606                 return ret;
 607         }
 608         return 0;
 609 }
 610
 611 void ipoib_cm_dev_stop(struct net_device *dev)
 612 {
 613         struct ipoib_dev_priv *priv = netdev_priv(dev);
 614         struct ipoib_cm_rx *p;
 615
 616         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 617                 return;
 618
 619         ib_destroy_cm_id(priv->cm.id);
 620         priv->cm.id = NULL;
 621         spin_lock_irq(&priv->lock);
 622         while (!list_empty(&priv->cm.passive_ids)) {
 623                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 624                 list_del_init(&p->list);
 625                 spin_unlock_irq(&priv->lock);
 626                 ib_destroy_cm_id(p->id);
 627                 ib_destroy_qp(p->qp);
 628                 kfree(p);
 629                 spin_lock_irq(&priv->lock);
 630         }
 631         spin_unlock_irq(&priv->lock);
 632
 633         cancel_delayed_work(&priv->cm.stale_task);
 634 }
 635
 636 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 637 {
 638         struct ipoib_cm_tx *p = cm_id->context;
 639         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 640         struct ipoib_cm_data *data = event->private_data;
 641         struct sk_buff_head skqueue;
 642         struct ib_qp_attr qp_attr;
 643         int qp_attr_mask, ret;
 644         struct sk_buff *skb;
 645
 646         p->mtu = be32_to_cpu(data->mtu);
 647
 648         if (p->mtu < priv->dev->mtu + IPOIB_ENCAP_LEN) {
 649                 ipoib_warn(priv, "Rejecting connection: mtu %d < device mtu %d + 4\n",
 650                            p->mtu, priv->dev->mtu);
 651                 return -EINVAL;
 652         }
 653
 654         qp_attr.qp_state = IB_QPS_RTR;
 655         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 656         if (ret) {
 657                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 658                 return ret;
 659         }
 660
 661         qp_attr.rq_psn = 0 /* FIXME */;
 662         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 663         if (ret) {
 664                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 665                 return ret;
 666         }
 667
 668         qp_attr.qp_state = IB_QPS_RTS;
 669         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 670         if (ret) {
 671                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 672                 return ret;
 673         }
 674         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 675         if (ret) {
 676                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 677                 return ret;
 678         }
 679
 680         skb_queue_head_init(&skqueue);
 681
 682         spin_lock_irq(&priv->lock);
 683         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 684         if (p->neigh)
 685                 while ((skb = __skb_dequeue(&p->neigh->queue)))
 686                         __skb_queue_tail(&skqueue, skb);
 687         spin_unlock_irq(&priv->lock);
 688
 689         while ((skb = __skb_dequeue(&skqueue))) {
 690                 skb->dev = p->dev;
 691                 if (dev_queue_xmit(skb))
 692                         ipoib_warn(priv, "dev_queue_xmit failed "
 693                                    "to requeue packet\n");
 694         }
 695
 696         ret = ib_send_cm_rtu(cm_id, NULL, 0);
 697         if (ret) {
 698                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
 699                 return ret;
 700         }
 701         return 0;
 702 }
 703
 704 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ib_cq *cq)
 705 {
 706         struct ipoib_dev_priv *priv = netdev_priv(dev);
 707         struct ib_qp_init_attr attr = {};
 708         attr.recv_cq = priv->cq;
 709         attr.srq = priv->cm.srq;
 710         attr.cap.max_send_wr = ipoib_sendq_size;
 711         attr.cap.max_send_sge = 1;
 712         attr.sq_sig_type = IB_SIGNAL_ALL_WR;
 713         attr.qp_type = IB_QPT_RC;
 714         attr.send_cq = cq;
 715         return ib_create_qp(priv->pd, &attr);
 716 }
 717
 718 static int ipoib_cm_send_req(struct net_device *dev,
 719                              struct ib_cm_id *id, struct ib_qp *qp,
 720                              u32 qpn,
 721                              struct ib_sa_path_rec *pathrec)
 722 {
 723         struct ipoib_dev_priv *priv = netdev_priv(dev);
 724         struct ipoib_cm_data data = {};
 725         struct ib_cm_req_param req = {};
 726
 727         data.qpn = cpu_to_be32(priv->qp->qp_num);
 728         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 729
 730         req.primary_path              = pathrec;
 731         req.alternate_path            = NULL;
 732         req.service_id                = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
 733         req.qp_num                    = qp->qp_num;
 734         req.qp_type                   = qp->qp_type;
 735         req.private_data              = &data;
 736         req.private_data_len          = sizeof data;
 737         req.flow_control              = 0;
 738
 739         req.starting_psn              = 0; /* FIXME */
 740
 741         /*
 742          * Pick some arbitrary defaults here; we could make these
 743          * module parameters if anyone cared about setting them.
 744          */
 745         req.responder_resources       = 4;
 746         req.remote_cm_response_timeout = 20;
 747         req.local_cm_response_timeout  = 20;
 748         req.retry_count               = 0; /* RFC draft warns against retries */
 749         req.rnr_retry_count           = 0; /* RFC draft warns against retries */
 750         req.max_cm_retries            = 15;
 751         req.srq                       = 1;
 752         return ib_send_cm_req(id, &req);
 753 }
 754
 755 static int ipoib_cm_modify_tx_init(struct net_device *dev,
 756                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
 757 {
 758         struct ipoib_dev_priv *priv = netdev_priv(dev);
 759         struct ib_qp_attr qp_attr;
 760         int qp_attr_mask, ret;
 761         ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
 762         if (ret) {
 763                 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
 764                 return ret;
 765         }
 766
 767         qp_attr.qp_state = IB_QPS_INIT;
 768         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 769         qp_attr.port_num = priv->port;
 770         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
 771
 772         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 773         if (ret) {
 774                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
 775                 return ret;
 776         }
 777         return 0;
 778 }
 779
 780 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
 781                             struct ib_sa_path_rec *pathrec)
 782 {
 783         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 784         int ret;
 785
 786         p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
 787                                 GFP_KERNEL);
 788         if (!p->tx_ring) {
 789                 ipoib_warn(priv, "failed to allocate tx ring\n");
 790                 ret = -ENOMEM;
 791                 goto err_tx;
 792         }
 793
 794         p->cq = ib_create_cq(priv->ca, ipoib_cm_tx_completion, NULL, p,
 795                              ipoib_sendq_size + 1, 0);
 796         if (IS_ERR(p->cq)) {
 797                 ret = PTR_ERR(p->cq);
 798                 ipoib_warn(priv, "failed to allocate tx cq: %d\n", ret);
 799                 goto err_cq;
 800         }
 801
 802         ret = ib_req_notify_cq(p->cq, IB_CQ_NEXT_COMP);
 803         if (ret) {
 804                 ipoib_warn(priv, "failed to request completion notification: %d\n", ret);
 805                 goto err_req_notify;
 806         }
 807
 808         p->qp = ipoib_cm_create_tx_qp(p->dev, p->cq);
 809         if (IS_ERR(p->qp)) {
 810                 ret = PTR_ERR(p->qp);
 811                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
 812                 goto err_qp;
 813         }
 814
 815         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
 816         if (IS_ERR(p->id)) {
 817                 ret = PTR_ERR(p->id);
 818                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
 819                 goto err_id;
 820         }
 821
 822         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
 823         if (ret) {
 824                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
 825                 goto err_modify;
 826         }
 827
 828         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
 829         if (ret) {
 830                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
 831                 goto err_send_cm;
 832         }
 833
 834         ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
 835                   p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
 836
 837         return 0;
 838
 839 err_send_cm:
 840 err_modify:
 841         ib_destroy_cm_id(p->id);
 842 err_id:
 843         p->id = NULL;
 844         ib_destroy_qp(p->qp);
 845 err_req_notify:
 846 err_qp:
 847         p->qp = NULL;
 848         ib_destroy_cq(p->cq);
 849 err_cq:
 850         p->cq = NULL;
 851 err_tx:
 852         return ret;
 853 }
 854
 855 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
 856 {
 857         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 858         struct ipoib_tx_buf *tx_req;
 859
 860         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
 861                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
 862
 863         if (p->id)
 864                 ib_destroy_cm_id(p->id);
 865
 866         if (p->qp)
 867                 ib_destroy_qp(p->qp);
 868
 869         if (p->cq)
 870                 ib_destroy_cq(p->cq);
 871
 872         if (test_bit(IPOIB_FLAG_NETIF_STOPPED, &p->flags))
 873                 netif_wake_queue(p->dev);
 874
 875         if (p->tx_ring) {
 876                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
 877                         tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
 878                         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
 879                                          DMA_TO_DEVICE);
 880                         dev_kfree_skb_any(tx_req->skb);
 881                         ++p->tx_tail;
 882                 }
 883
 884                 kfree(p->tx_ring);
 885         }
 886
 887         kfree(p);
 888 }
 889
 890 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
 891                                struct ib_cm_event *event)
 892 {
 893         struct ipoib_cm_tx *tx = cm_id->context;
 894         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
 895         struct net_device *dev = priv->dev;
 896         struct ipoib_neigh *neigh;
 897         int ret;
 898
 899         switch (event->event) {
 900         case IB_CM_DREQ_RECEIVED:
 901                 ipoib_dbg(priv, "DREQ received.\n");
 902                 ib_send_cm_drep(cm_id, NULL, 0);
 903                 break;
 904         case IB_CM_REP_RECEIVED:
 905                 ipoib_dbg(priv, "REP received.\n");
 906                 ret = ipoib_cm_rep_handler(cm_id, event);
 907                 if (ret)
 908                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
 909                                        NULL, 0, NULL, 0);
 910                 break;
 911         case IB_CM_REQ_ERROR:
 912         case IB_CM_REJ_RECEIVED:
 913         case IB_CM_TIMEWAIT_EXIT:
 914                 ipoib_dbg(priv, "CM error %d.\n", event->event);
 915                 spin_lock_irq(&priv->tx_lock);
 916                 spin_lock(&priv->lock);
 917                 neigh = tx->neigh;
 918
 919                 if (neigh) {
 920                         neigh->cm = NULL;
 921                         list_del(&neigh->list);
 922                         if (neigh->ah)
 923                                 ipoib_put_ah(neigh->ah);
 924                         ipoib_neigh_free(dev, neigh);
 925
 926                         tx->neigh = NULL;
 927                 }
 928
 929                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 930                         list_move(&tx->list, &priv->cm.reap_list);
 931                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 932                 }
 933
 934                 spin_unlock(&priv->lock);
 935                 spin_unlock_irq(&priv->tx_lock);
 936                 break;
 937         default:
 938                 break;
 939         }
 940
 941         return 0;
 942 }
 943
 944 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
 945                                        struct ipoib_neigh *neigh)
 946 {
 947         struct ipoib_dev_priv *priv = netdev_priv(dev);
 948         struct ipoib_cm_tx *tx;
 949
 950         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
 951         if (!tx)
 952                 return NULL;
 953
 954         neigh->cm = tx;
 955         tx->neigh = neigh;
 956         tx->path = path;
 957         tx->dev = dev;
 958         list_add(&tx->list, &priv->cm.start_list);
 959         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
 960         queue_work(ipoib_workqueue, &priv->cm.start_task);
 961         return tx;
 962 }
 963
 964 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
 965 {
 966         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
 967         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 968                 list_move(&tx->list, &priv->cm.reap_list);
 969                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
 970                 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
 971                           IPOIB_GID_ARG(tx->neigh->dgid));
 972                 tx->neigh = NULL;
 973         }
 974 }
 975
 976 static void ipoib_cm_tx_start(struct work_struct *work)
 977 {
 978         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
 979                                                    cm.start_task);
 980         struct net_device *dev = priv->dev;
 981         struct ipoib_neigh *neigh;
 982         struct ipoib_cm_tx *p;
 983         unsigned long flags;
 984         int ret;
 985
 986         struct ib_sa_path_rec pathrec;
 987         u32 qpn;
 988
 989         spin_lock_irqsave(&priv->tx_lock, flags);
 990         spin_lock(&priv->lock);
 991         while (!list_empty(&priv->cm.start_list)) {
 992                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
 993                 list_del_init(&p->list);
 994                 neigh = p->neigh;
 995                 qpn = IPOIB_QPN(neigh->neighbour->ha);
 996                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
 997                 spin_unlock(&priv->lock);
 998                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 999                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1000                 spin_lock_irqsave(&priv->tx_lock, flags);
1001                 spin_lock(&priv->lock);
1002                 if (ret) {
1003                         neigh = p->neigh;
1004                         if (neigh) {
1005                                 neigh->cm = NULL;
1006                                 list_del(&neigh->list);
1007                                 if (neigh->ah)
1008                                         ipoib_put_ah(neigh->ah);
1009                                 ipoib_neigh_free(dev, neigh);
1010                         }
1011                         list_del(&p->list);
1012                         kfree(p);
1013                 }
1014         }
1015         spin_unlock(&priv->lock);
1016         spin_unlock_irqrestore(&priv->tx_lock, flags);
1017 }
1018
1019 static void ipoib_cm_tx_reap(struct work_struct *work)
1020 {
1021         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1022                                                    cm.reap_task);
1023         struct ipoib_cm_tx *p;
1024
1025         spin_lock_irq(&priv->tx_lock);
1026         spin_lock(&priv->lock);
1027         while (!list_empty(&priv->cm.reap_list)) {
1028                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1029                 list_del(&p->list);
1030                 spin_unlock(&priv->lock);
1031                 spin_unlock_irq(&priv->tx_lock);
1032                 ipoib_cm_tx_destroy(p);
1033                 spin_lock_irq(&priv->tx_lock);
1034                 spin_lock(&priv->lock);
1035         }
1036         spin_unlock(&priv->lock);
1037         spin_unlock_irq(&priv->tx_lock);
1038 }
1039
1040 static void ipoib_cm_skb_reap(struct work_struct *work)
1041 {
1042         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1043                                                    cm.skb_task);
1044         struct net_device *dev = priv->dev;
1045         struct sk_buff *skb;
1046
1047         unsigned mtu = priv->mcast_mtu;
1048
1049         spin_lock_irq(&priv->tx_lock);
1050         spin_lock(&priv->lock);
1051         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1052                 spin_unlock(&priv->lock);
1053                 spin_unlock_irq(&priv->tx_lock);
1054                 if (skb->protocol == htons(ETH_P_IP))
1055                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1056 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1057                 else if (skb->protocol == htons(ETH_P_IPV6))
1058                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
1059 #endif
1060                 dev_kfree_skb_any(skb);
1061                 spin_lock_irq(&priv->tx_lock);
1062                 spin_lock(&priv->lock);
1063         }
1064         spin_unlock(&priv->lock);
1065         spin_unlock_irq(&priv->tx_lock);
1066 }
1067
1068 void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
1069                            unsigned int mtu)
1070 {
1071         struct ipoib_dev_priv *priv = netdev_priv(dev);
1072         int e = skb_queue_empty(&priv->cm.skb_queue);
1073
1074         if (skb->dst)
1075                 skb->dst->ops->update_pmtu(skb->dst, mtu);
1076
1077         skb_queue_tail(&priv->cm.skb_queue, skb);
1078         if (e)
1079                 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1080 }
1081
1082 static void ipoib_cm_stale_task(struct work_struct *work)
1083 {
1084         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1085                                                    cm.stale_task.work);
1086         struct ipoib_cm_rx *p;
1087
1088         spin_lock_irq(&priv->lock);
1089         while (!list_empty(&priv->cm.passive_ids)) {
1090                 /* List if sorted by LRU, start from tail,
1091                  * stop when we see a recently used entry */
1092                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1093                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1094                         break;
1095                 list_del_init(&p->list);
1096                 spin_unlock_irq(&priv->lock);
1097                 ib_destroy_cm_id(p->id);
1098                 ib_destroy_qp(p->qp);
1099                 kfree(p);
1100                 spin_lock_irq(&priv->lock);
1101         }
1102
1103         if (!list_empty(&priv->cm.passive_ids))
1104                 queue_delayed_work(ipoib_workqueue,
1105                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1106         spin_unlock_irq(&priv->lock);
1107 }
1108
1109
1110 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1111                          char *buf)
1112 {
1113         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1114
1115         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1116                 return sprintf(buf, "connected\n");
1117         else
1118                 return sprintf(buf, "datagram\n");
1119 }
1120
1121 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1122                         const char *buf, size_t count)
1123 {
1124         struct net_device *dev = to_net_dev(d);
1125         struct ipoib_dev_priv *priv = netdev_priv(dev);
1126
1127         /* flush paths if we switch modes so that connections are restarted */
1128         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1129                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1130                 ipoib_warn(priv, "enabling connected mode "
1131                            "will cause multicast packet drops\n");
1132                 ipoib_flush_paths(dev);
1133                 return count;
1134         }
1135
1136         if (!strcmp(buf, "datagram\n")) {
1137                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1138                 dev->mtu = min(priv->mcast_mtu, dev->mtu);
1139                 ipoib_flush_paths(dev);
1140                 return count;
1141         }
1142
1143         return -EINVAL;
1144 }
1145
1146 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1147
1148 int ipoib_cm_add_mode_attr(struct net_device *dev)
1149 {
1150         return device_create_file(&dev->dev, &dev_attr_mode);
1151 }
1152
1153 int ipoib_cm_dev_init(struct net_device *dev)
1154 {
1155         struct ipoib_dev_priv *priv = netdev_priv(dev);
1156         struct ib_srq_init_attr srq_init_attr = {
1157                 .attr = {
1158                         .max_wr  = ipoib_recvq_size,
1159                         .max_sge = IPOIB_CM_RX_SG
1160                 }
1161         };
1162         int ret, i;
1163
1164         INIT_LIST_HEAD(&priv->cm.passive_ids);
1165         INIT_LIST_HEAD(&priv->cm.reap_list);
1166         INIT_LIST_HEAD(&priv->cm.start_list);
1167         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1168         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1169         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1170         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1171
1172         skb_queue_head_init(&priv->cm.skb_queue);
1173
1174         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1175         if (IS_ERR(priv->cm.srq)) {
1176                 ret = PTR_ERR(priv->cm.srq);
1177                 priv->cm.srq = NULL;
1178                 return ret;
1179         }
1180
1181         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1182                                     GFP_KERNEL);
1183         if (!priv->cm.srq_ring) {
1184                 printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
1185                        priv->ca->name, ipoib_recvq_size);
1186                 ipoib_cm_dev_cleanup(dev);
1187                 return -ENOMEM;
1188         }
1189
1190         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
1191                 priv->cm.rx_sge[i].lkey = priv->mr->lkey;
1192
1193         priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
1194         for (i = 1; i < IPOIB_CM_RX_SG; ++i)
1195                 priv->cm.rx_sge[i].length = PAGE_SIZE;
1196         priv->cm.rx_wr.next = NULL;
1197         priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
1198         priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;
1199
1200         for (i = 0; i < ipoib_recvq_size; ++i) {
1201                 if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1,
1202                                            priv->cm.srq_ring[i].mapping)) {
1203                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
1204                         ipoib_cm_dev_cleanup(dev);
1205                         return -ENOMEM;
1206                 }
1207                 if (ipoib_cm_post_receive(dev, i)) {
1208                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
1209                         ipoib_cm_dev_cleanup(dev);
1210                         return -EIO;
1211                 }
1212         }
1213
1214         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1215         return 0;
1216 }
1217
1218 void ipoib_cm_dev_cleanup(struct net_device *dev)
1219 {
1220         struct ipoib_dev_priv *priv = netdev_priv(dev);
1221         int i, ret;
1222
1223         if (!priv->cm.srq)
1224                 return;
1225
1226         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1227
1228         ret = ib_destroy_srq(priv->cm.srq);
1229         if (ret)
1230                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1231
1232         priv->cm.srq = NULL;
1233         if (!priv->cm.srq_ring)
1234                 return;
1235         for (i = 0; i < ipoib_recvq_size; ++i)
1236                 if (priv->cm.srq_ring[i].skb) {
1237                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
1238                                               priv->cm.srq_ring[i].mapping);
1239                         dev_kfree_skb_any(priv->cm.srq_ring[i].skb);
1240                         priv->cm.srq_ring[i].skb = NULL;
1241                 }
1242         kfree(priv->cm.srq_ring);
1243         priv->cm.srq_ring = NULL;
1244 }