git.oblomov.eu Git - linux-2.6/blob - 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 #include <linux/delay.h>
  41
  42 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  43 static int data_debug_level;
  44
  45 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  46 MODULE_PARM_DESC(cm_data_debug_level,
  47                  "Enable data path debug tracing for connected mode if > 0");
  48 #endif
  49
  50 #include "ipoib.h"
  51
  52 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  53
  54 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
  55 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
  56 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
  57 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
  58
  59 static struct ib_qp_attr ipoib_cm_err_attr = {
  60         .qp_state = IB_QPS_ERR
  61 };
  62
  63 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
  64
  65 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  66         .wr_id = IPOIB_CM_RX_DRAIN_WRID,
  67         .opcode = IB_WR_SEND,
  68 };
  69
  70 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  71                                struct ib_cm_event *event);
  72
  73 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
  74                                   u64 mapping[IPOIB_CM_RX_SG])
  75 {
  76         int i;
  77
  78         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
  79
  80         for (i = 0; i < frags; ++i)
  81                 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
  82 }
  83
  84 static int ipoib_cm_post_receive(struct net_device *dev, int id)
  85 {
  86         struct ipoib_dev_priv *priv = netdev_priv(dev);
  87         struct ib_recv_wr *bad_wr;
  88         int i, ret;
  89
  90         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
  91
  92         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
  93                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
  94
  95         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
  96         if (unlikely(ret)) {
  97                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
  98                 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
  99                                       priv->cm.srq_ring[id].mapping);
 100                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
 101                 priv->cm.srq_ring[id].skb = NULL;
 102         }
 103
 104         return ret;
 105 }
 106
 107 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags,
 108                                              u64 mapping[IPOIB_CM_RX_SG])
 109 {
 110         struct ipoib_dev_priv *priv = netdev_priv(dev);
 111         struct sk_buff *skb;
 112         int i;
 113
 114         skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
 115         if (unlikely(!skb))
 116                 return NULL;
 117
 118         /*
 119          * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
 120          * IP header to a multiple of 16.
 121          */
 122         skb_reserve(skb, 12);
 123
 124         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 125                                        DMA_FROM_DEVICE);
 126         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 127                 dev_kfree_skb_any(skb);
 128                 return NULL;
 129         }
 130
 131         for (i = 0; i < frags; i++) {
 132                 struct page *page = alloc_page(GFP_ATOMIC);
 133
 134                 if (!page)
 135                         goto partial_error;
 136                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 137
 138                 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
 139                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
 140                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 141                         goto partial_error;
 142         }
 143
 144         priv->cm.srq_ring[id].skb = skb;
 145         return skb;
 146
 147 partial_error:
 148
 149         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 150
 151         for (; i > 0; --i)
 152                 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
 153
 154         dev_kfree_skb_any(skb);
 155         return NULL;
 156 }
 157
 158 static void ipoib_cm_free_rx_ring(struct net_device *dev,
 159                                   struct ipoib_cm_rx_buf *rx_ring)
 160 {
 161         struct ipoib_dev_priv *priv = netdev_priv(dev);
 162         int i;
 163
 164         for (i = 0; i < ipoib_recvq_size; ++i)
 165                 if (rx_ring[i].skb) {
 166                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 167                                               rx_ring[i].mapping);
 168                         dev_kfree_skb_any(rx_ring[i].skb);
 169                 }
 170
 171         kfree(rx_ring);
 172 }
 173
 174 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 175 {
 176         struct ib_send_wr *bad_wr;
 177         struct ipoib_cm_rx *p;
 178
 179         /* We only reserved 1 extra slot in CQ for drain WRs, so
 180          * make sure we have at most 1 outstanding WR. */
 181         if (list_empty(&priv->cm.rx_flush_list) ||
 182             !list_empty(&priv->cm.rx_drain_list))
 183                 return;
 184
 185         /*
 186          * QPs on flush list are error state.  This way, a "flush
 187          * error" WC will be immediately generated for each WR we post.
 188          */
 189         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 190         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
 191                 ipoib_warn(priv, "failed to post drain wr\n");
 192
 193         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 194 }
 195
 196 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 197 {
 198         struct ipoib_cm_rx *p = ctx;
 199         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 200         unsigned long flags;
 201
 202         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 203                 return;
 204
 205         spin_lock_irqsave(&priv->lock, flags);
 206         list_move(&p->list, &priv->cm.rx_flush_list);
 207         p->state = IPOIB_CM_RX_FLUSH;
 208         ipoib_cm_start_rx_drain(priv);
 209         spin_unlock_irqrestore(&priv->lock, flags);
 210 }
 211
 212 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 213                                            struct ipoib_cm_rx *p)
 214 {
 215         struct ipoib_dev_priv *priv = netdev_priv(dev);
 216         struct ib_qp_init_attr attr = {
 217                 .event_handler = ipoib_cm_rx_event_handler,
 218                 .send_cq = priv->cq, /* For drain WR */
 219                 .recv_cq = priv->cq,
 220                 .srq = priv->cm.srq,
 221                 .cap.max_send_wr = 1, /* For drain WR */
 222                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 223                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 224                 .qp_type = IB_QPT_RC,
 225                 .qp_context = p,
 226         };
 227         return ib_create_qp(priv->pd, &attr);
 228 }
 229
 230 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 231                                   struct ib_cm_id *cm_id, struct ib_qp *qp,
 232                                   unsigned psn)
 233 {
 234         struct ipoib_dev_priv *priv = netdev_priv(dev);
 235         struct ib_qp_attr qp_attr;
 236         int qp_attr_mask, ret;
 237
 238         qp_attr.qp_state = IB_QPS_INIT;
 239         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 240         if (ret) {
 241                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 242                 return ret;
 243         }
 244         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 245         if (ret) {
 246                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 247                 return ret;
 248         }
 249         qp_attr.qp_state = IB_QPS_RTR;
 250         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 251         if (ret) {
 252                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 253                 return ret;
 254         }
 255         qp_attr.rq_psn = psn;
 256         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 257         if (ret) {
 258                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 259                 return ret;
 260         }
 261
 262         /*
 263          * Current Mellanox HCA firmware won't generate completions
 264          * with error for drain WRs unless the QP has been moved to
 265          * RTS first. This work-around leaves a window where a QP has
 266          * moved to error asynchronously, but this will eventually get
 267          * fixed in firmware, so let's not error out if modify QP
 268          * fails.
 269          */
 270         qp_attr.qp_state = IB_QPS_RTS;
 271         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 272         if (ret) {
 273                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 274                 return 0;
 275         }
 276         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 277         if (ret) {
 278                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 279                 return 0;
 280         }
 281
 282         return 0;
 283 }
 284
 285 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 286                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 287                              unsigned psn)
 288 {
 289         struct ipoib_dev_priv *priv = netdev_priv(dev);
 290         struct ipoib_cm_data data = {};
 291         struct ib_cm_rep_param rep = {};
 292
 293         data.qpn = cpu_to_be32(priv->qp->qp_num);
 294         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 295
 296         rep.private_data = &data;
 297         rep.private_data_len = sizeof data;
 298         rep.flow_control = 0;
 299         rep.rnr_retry_count = req->rnr_retry_count;
 300         rep.srq = 1;
 301         rep.qp_num = qp->qp_num;
 302         rep.starting_psn = psn;
 303         return ib_send_cm_rep(cm_id, &rep);
 304 }
 305
 306 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 307 {
 308         struct net_device *dev = cm_id->context;
 309         struct ipoib_dev_priv *priv = netdev_priv(dev);
 310         struct ipoib_cm_rx *p;
 311         unsigned psn;
 312         int ret;
 313
 314         ipoib_dbg(priv, "REQ arrived\n");
 315         p = kzalloc(sizeof *p, GFP_KERNEL);
 316         if (!p)
 317                 return -ENOMEM;
 318         p->dev = dev;
 319         p->id = cm_id;
 320         cm_id->context = p;
 321         p->state = IPOIB_CM_RX_LIVE;
 322         p->jiffies = jiffies;
 323         INIT_LIST_HEAD(&p->list);
 324
 325         p->qp = ipoib_cm_create_rx_qp(dev, p);
 326         if (IS_ERR(p->qp)) {
 327                 ret = PTR_ERR(p->qp);
 328                 goto err_qp;
 329         }
 330
 331         psn = random32() & 0xffffff;
 332         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 333         if (ret)
 334                 goto err_modify;
 335
 336         spin_lock_irq(&priv->lock);
 337         queue_delayed_work(ipoib_workqueue,
 338                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 339         /* Add this entry to passive ids list head, but do not re-add it
 340          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 341         p->jiffies = jiffies;
 342         if (p->state == IPOIB_CM_RX_LIVE)
 343                 list_move(&p->list, &priv->cm.passive_ids);
 344         spin_unlock_irq(&priv->lock);
 345
 346         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 347         if (ret) {
 348                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 349                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 350                         ipoib_warn(priv, "unable to move qp to error state\n");
 351         }
 352         return 0;
 353
 354 err_modify:
 355         ib_destroy_qp(p->qp);
 356 err_qp:
 357         kfree(p);
 358         return ret;
 359 }
 360
 361 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 362                                struct ib_cm_event *event)
 363 {
 364         struct ipoib_cm_rx *p;
 365         struct ipoib_dev_priv *priv;
 366
 367         switch (event->event) {
 368         case IB_CM_REQ_RECEIVED:
 369                 return ipoib_cm_req_handler(cm_id, event);
 370         case IB_CM_DREQ_RECEIVED:
 371                 p = cm_id->context;
 372                 ib_send_cm_drep(cm_id, NULL, 0);
 373                 /* Fall through */
 374         case IB_CM_REJ_RECEIVED:
 375                 p = cm_id->context;
 376                 priv = netdev_priv(p->dev);
 377                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 378                         ipoib_warn(priv, "unable to move qp to error state\n");
 379                 /* Fall through */
 380         default:
 381                 return 0;
 382         }
 383 }
 384 /* Adjust length of skb with fragments to match received data */
 385 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 386                           unsigned int length, struct sk_buff *toskb)
 387 {
 388         int i, num_frags;
 389         unsigned int size;
 390
 391         /* put header into skb */
 392         size = min(length, hdr_space);
 393         skb->tail += size;
 394         skb->len += size;
 395         length -= size;
 396
 397         num_frags = skb_shinfo(skb)->nr_frags;
 398         for (i = 0; i < num_frags; i++) {
 399                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 400
 401                 if (length == 0) {
 402                         /* don't need this page */
 403                         skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
 404                         --skb_shinfo(skb)->nr_frags;
 405                 } else {
 406                         size = min(length, (unsigned) PAGE_SIZE);
 407
 408                         frag->size = size;
 409                         skb->data_len += size;
 410                         skb->truesize += size;
 411                         skb->len += size;
 412                         length -= size;
 413                 }
 414         }
 415 }
 416
 417 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 418 {
 419         struct ipoib_dev_priv *priv = netdev_priv(dev);
 420         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
 421         struct sk_buff *skb, *newskb;
 422         struct ipoib_cm_rx *p;
 423         unsigned long flags;
 424         u64 mapping[IPOIB_CM_RX_SG];
 425         int frags;
 426
 427         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 428                        wr_id, wc->status);
 429
 430         if (unlikely(wr_id >= ipoib_recvq_size)) {
 431                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
 432                         spin_lock_irqsave(&priv->lock, flags);
 433                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 434                         ipoib_cm_start_rx_drain(priv);
 435                         queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
 436                         spin_unlock_irqrestore(&priv->lock, flags);
 437                 } else
 438                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 439                                    wr_id, ipoib_recvq_size);
 440                 return;
 441         }
 442
 443         skb  = priv->cm.srq_ring[wr_id].skb;
 444
 445         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 446                 ipoib_dbg(priv, "cm recv error "
 447                            "(status=%d, wrid=%d vend_err %x)\n",
 448                            wc->status, wr_id, wc->vendor_err);
 449                 ++dev->stats.rx_dropped;
 450                 goto repost;
 451         }
 452
 453         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
 454                 p = wc->qp->qp_context;
 455                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 456                         spin_lock_irqsave(&priv->lock, flags);
 457                         p->jiffies = jiffies;
 458                         /* Move this entry to list head, but do not re-add it
 459                          * if it has been moved out of list. */
 460                         if (p->state == IPOIB_CM_RX_LIVE)
 461                                 list_move(&p->list, &priv->cm.passive_ids);
 462                         spin_unlock_irqrestore(&priv->lock, flags);
 463                 }
 464         }
 465
 466         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
 467                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
 468
 469         newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping);
 470         if (unlikely(!newskb)) {
 471                 /*
 472                  * If we can't allocate a new RX buffer, dump
 473                  * this packet and reuse the old buffer.
 474                  */
 475                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 476                 ++dev->stats.rx_dropped;
 477                 goto repost;
 478         }
 479
 480         ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping);
 481         memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
 482
 483         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 484                        wc->byte_len, wc->slid);
 485
 486         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 487
 488         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 489         skb_reset_mac_header(skb);
 490         skb_pull(skb, IPOIB_ENCAP_LEN);
 491
 492         dev->last_rx = jiffies;
 493         ++dev->stats.rx_packets;
 494         dev->stats.rx_bytes += skb->len;
 495
 496         skb->dev = dev;
 497         /* XXX get correct PACKET_ type here */
 498         skb->pkt_type = PACKET_HOST;
 499         netif_receive_skb(skb);
 500
 501 repost:
 502         if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
 503                 ipoib_warn(priv, "ipoib_cm_post_receive failed "
 504                            "for buf %d\n", wr_id);
 505 }
 506
 507 static inline int post_send(struct ipoib_dev_priv *priv,
 508                             struct ipoib_cm_tx *tx,
 509                             unsigned int wr_id,
 510                             u64 addr, int len)
 511 {
 512         struct ib_send_wr *bad_wr;
 513
 514         priv->tx_sge.addr       = addr;
 515         priv->tx_sge.length     = len;
 516
 517         priv->tx_wr.wr_id       = wr_id | IPOIB_OP_CM;
 518
 519         return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
 520 }
 521
 522 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 523 {
 524         struct ipoib_dev_priv *priv = netdev_priv(dev);
 525         struct ipoib_tx_buf *tx_req;
 526         u64 addr;
 527
 528         if (unlikely(skb->len > tx->mtu)) {
 529                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 530                            skb->len, tx->mtu);
 531                 ++dev->stats.tx_dropped;
 532                 ++dev->stats.tx_errors;
 533                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 534                 return;
 535         }
 536
 537         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 538                        tx->tx_head, skb->len, tx->qp->qp_num);
 539
 540         /*
 541          * We put the skb into the tx_ring _before_ we call post_send()
 542          * because it's entirely possible that the completion handler will
 543          * run before we execute anything after the post_send().  That
 544          * means we have to make sure everything is properly recorded and
 545          * our state is consistent before we call post_send().
 546          */
 547         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 548         tx_req->skb = skb;
 549         addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
 550         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 551                 ++dev->stats.tx_errors;
 552                 dev_kfree_skb_any(skb);
 553                 return;
 554         }
 555
 556         tx_req->mapping = addr;
 557
 558         if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
 559                                addr, skb->len))) {
 560                 ipoib_warn(priv, "post_send failed\n");
 561                 ++dev->stats.tx_errors;
 562                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
 563                 dev_kfree_skb_any(skb);
 564         } else {
 565                 dev->trans_start = jiffies;
 566                 ++tx->tx_head;
 567
 568                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 569                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 570                                   tx->qp->qp_num);
 571                         netif_stop_queue(dev);
 572                 }
 573         }
 574 }
 575
 576 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 577 {
 578         struct ipoib_dev_priv *priv = netdev_priv(dev);
 579         struct ipoib_cm_tx *tx = wc->qp->qp_context;
 580         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 581         struct ipoib_tx_buf *tx_req;
 582         unsigned long flags;
 583
 584         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 585                        wr_id, wc->status);
 586
 587         if (unlikely(wr_id >= ipoib_sendq_size)) {
 588                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 589                            wr_id, ipoib_sendq_size);
 590                 return;
 591         }
 592
 593         tx_req = &tx->tx_ring[wr_id];
 594
 595         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
 596
 597         /* FIXME: is this right? Shouldn't we only increment on success? */
 598         ++dev->stats.tx_packets;
 599         dev->stats.tx_bytes += tx_req->skb->len;
 600
 601         dev_kfree_skb_any(tx_req->skb);
 602
 603         spin_lock_irqsave(&priv->tx_lock, flags);
 604         ++tx->tx_tail;
 605         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 606             netif_queue_stopped(dev) &&
 607             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 608                 netif_wake_queue(dev);
 609
 610         if (wc->status != IB_WC_SUCCESS &&
 611             wc->status != IB_WC_WR_FLUSH_ERR) {
 612                 struct ipoib_neigh *neigh;
 613
 614                 ipoib_dbg(priv, "failed cm send event "
 615                            "(status=%d, wrid=%d vend_err %x)\n",
 616                            wc->status, wr_id, wc->vendor_err);
 617
 618                 spin_lock(&priv->lock);
 619                 neigh = tx->neigh;
 620
 621                 if (neigh) {
 622                         neigh->cm = NULL;
 623                         list_del(&neigh->list);
 624                         if (neigh->ah)
 625                                 ipoib_put_ah(neigh->ah);
 626                         ipoib_neigh_free(dev, neigh);
 627
 628                         tx->neigh = NULL;
 629                 }
 630
 631                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 632                         list_move(&tx->list, &priv->cm.reap_list);
 633                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 634                 }
 635
 636                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 637
 638                 spin_unlock(&priv->lock);
 639         }
 640
 641         spin_unlock_irqrestore(&priv->tx_lock, flags);
 642 }
 643
 644 int ipoib_cm_dev_open(struct net_device *dev)
 645 {
 646         struct ipoib_dev_priv *priv = netdev_priv(dev);
 647         int ret;
 648
 649         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 650                 return 0;
 651
 652         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 653         if (IS_ERR(priv->cm.id)) {
 654                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 655                 ret = PTR_ERR(priv->cm.id);
 656                 goto err_cm;
 657         }
 658
 659         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 660                            0, NULL);
 661         if (ret) {
 662                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 663                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 664                 goto err_listen;
 665         }
 666
 667         return 0;
 668
 669 err_listen:
 670         ib_destroy_cm_id(priv->cm.id);
 671 err_cm:
 672         priv->cm.id = NULL;
 673         return ret;
 674 }
 675
 676 void ipoib_cm_dev_stop(struct net_device *dev)
 677 {
 678         struct ipoib_dev_priv *priv = netdev_priv(dev);
 679         struct ipoib_cm_rx *p, *n;
 680         unsigned long begin;
 681         LIST_HEAD(list);
 682         int ret;
 683
 684         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 685                 return;
 686
 687         ib_destroy_cm_id(priv->cm.id);
 688         priv->cm.id = NULL;
 689
 690         spin_lock_irq(&priv->lock);
 691         while (!list_empty(&priv->cm.passive_ids)) {
 692                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 693                 list_move(&p->list, &priv->cm.rx_error_list);
 694                 p->state = IPOIB_CM_RX_ERROR;
 695                 spin_unlock_irq(&priv->lock);
 696                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 697                 if (ret)
 698                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 699                 spin_lock_irq(&priv->lock);
 700         }
 701
 702         /* Wait for all RX to be drained */
 703         begin = jiffies;
 704
 705         while (!list_empty(&priv->cm.rx_error_list) ||
 706                !list_empty(&priv->cm.rx_flush_list) ||
 707                !list_empty(&priv->cm.rx_drain_list)) {
 708                 if (time_after(jiffies, begin + 5 * HZ)) {
 709                         ipoib_warn(priv, "RX drain timing out\n");
 710
 711                         /*
 712                          * assume the HW is wedged and just free up everything.
 713                          */
 714                         list_splice_init(&priv->cm.rx_flush_list, &list);
 715                         list_splice_init(&priv->cm.rx_error_list, &list);
 716                         list_splice_init(&priv->cm.rx_drain_list, &list);
 717                         break;
 718                 }
 719                 spin_unlock_irq(&priv->lock);
 720                 msleep(1);
 721                 ipoib_drain_cq(dev);
 722                 spin_lock_irq(&priv->lock);
 723         }
 724
 725         list_splice_init(&priv->cm.rx_reap_list, &list);
 726
 727         spin_unlock_irq(&priv->lock);
 728
 729         list_for_each_entry_safe(p, n, &list, list) {
 730                 ib_destroy_cm_id(p->id);
 731                 ib_destroy_qp(p->qp);
 732                 kfree(p);
 733         }
 734
 735         cancel_delayed_work(&priv->cm.stale_task);
 736 }
 737
 738 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 739 {
 740         struct ipoib_cm_tx *p = cm_id->context;
 741         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 742         struct ipoib_cm_data *data = event->private_data;
 743         struct sk_buff_head skqueue;
 744         struct ib_qp_attr qp_attr;
 745         int qp_attr_mask, ret;
 746         struct sk_buff *skb;
 747
 748         p->mtu = be32_to_cpu(data->mtu);
 749
 750         if (p->mtu <= IPOIB_ENCAP_LEN) {
 751                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 752                            p->mtu, IPOIB_ENCAP_LEN);
 753                 return -EINVAL;
 754         }
 755
 756         qp_attr.qp_state = IB_QPS_RTR;
 757         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 758         if (ret) {
 759                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 760                 return ret;
 761         }
 762
 763         qp_attr.rq_psn = 0 /* FIXME */;
 764         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 765         if (ret) {
 766                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 767                 return ret;
 768         }
 769
 770         qp_attr.qp_state = IB_QPS_RTS;
 771         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 772         if (ret) {
 773                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 774                 return ret;
 775         }
 776         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 777         if (ret) {
 778                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 779                 return ret;
 780         }
 781
 782         skb_queue_head_init(&skqueue);
 783
 784         spin_lock_irq(&priv->lock);
 785         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 786         if (p->neigh)
 787                 while ((skb = __skb_dequeue(&p->neigh->queue)))
 788                         __skb_queue_tail(&skqueue, skb);
 789         spin_unlock_irq(&priv->lock);
 790
 791         while ((skb = __skb_dequeue(&skqueue))) {
 792                 skb->dev = p->dev;
 793                 if (dev_queue_xmit(skb))
 794                         ipoib_warn(priv, "dev_queue_xmit failed "
 795                                    "to requeue packet\n");
 796         }
 797
 798         ret = ib_send_cm_rtu(cm_id, NULL, 0);
 799         if (ret) {
 800                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
 801                 return ret;
 802         }
 803         return 0;
 804 }
 805
 806 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
 807 {
 808         struct ipoib_dev_priv *priv = netdev_priv(dev);
 809         struct ib_qp_init_attr attr = {
 810                 .send_cq                = priv->cq,
 811                 .recv_cq                = priv->cq,
 812                 .srq                    = priv->cm.srq,
 813                 .cap.max_send_wr        = ipoib_sendq_size,
 814                 .cap.max_send_sge       = 1,
 815                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
 816                 .qp_type                = IB_QPT_RC,
 817                 .qp_context             = tx
 818         };
 819
 820         return ib_create_qp(priv->pd, &attr);
 821 }
 822
 823 static int ipoib_cm_send_req(struct net_device *dev,
 824                              struct ib_cm_id *id, struct ib_qp *qp,
 825                              u32 qpn,
 826                              struct ib_sa_path_rec *pathrec)
 827 {
 828         struct ipoib_dev_priv *priv = netdev_priv(dev);
 829         struct ipoib_cm_data data = {};
 830         struct ib_cm_req_param req = {};
 831
 832         data.qpn = cpu_to_be32(priv->qp->qp_num);
 833         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 834
 835         req.primary_path                = pathrec;
 836         req.alternate_path              = NULL;
 837         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
 838         req.qp_num                      = qp->qp_num;
 839         req.qp_type                     = qp->qp_type;
 840         req.private_data                = &data;
 841         req.private_data_len            = sizeof data;
 842         req.flow_control                = 0;
 843
 844         req.starting_psn                = 0; /* FIXME */
 845
 846         /*
 847          * Pick some arbitrary defaults here; we could make these
 848          * module parameters if anyone cared about setting them.
 849          */
 850         req.responder_resources         = 4;
 851         req.remote_cm_response_timeout  = 20;
 852         req.local_cm_response_timeout   = 20;
 853         req.retry_count                 = 0; /* RFC draft warns against retries */
 854         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
 855         req.max_cm_retries              = 15;
 856         req.srq                         = 1;
 857         return ib_send_cm_req(id, &req);
 858 }
 859
 860 static int ipoib_cm_modify_tx_init(struct net_device *dev,
 861                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
 862 {
 863         struct ipoib_dev_priv *priv = netdev_priv(dev);
 864         struct ib_qp_attr qp_attr;
 865         int qp_attr_mask, ret;
 866         ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
 867         if (ret) {
 868                 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
 869                 return ret;
 870         }
 871
 872         qp_attr.qp_state = IB_QPS_INIT;
 873         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
 874         qp_attr.port_num = priv->port;
 875         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
 876
 877         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 878         if (ret) {
 879                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
 880                 return ret;
 881         }
 882         return 0;
 883 }
 884
 885 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
 886                             struct ib_sa_path_rec *pathrec)
 887 {
 888         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 889         int ret;
 890
 891         p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
 892                                 GFP_KERNEL);
 893         if (!p->tx_ring) {
 894                 ipoib_warn(priv, "failed to allocate tx ring\n");
 895                 ret = -ENOMEM;
 896                 goto err_tx;
 897         }
 898
 899         p->qp = ipoib_cm_create_tx_qp(p->dev, p);
 900         if (IS_ERR(p->qp)) {
 901                 ret = PTR_ERR(p->qp);
 902                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
 903                 goto err_qp;
 904         }
 905
 906         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
 907         if (IS_ERR(p->id)) {
 908                 ret = PTR_ERR(p->id);
 909                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
 910                 goto err_id;
 911         }
 912
 913         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
 914         if (ret) {
 915                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
 916                 goto err_modify;
 917         }
 918
 919         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
 920         if (ret) {
 921                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
 922                 goto err_send_cm;
 923         }
 924
 925         ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
 926                   p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
 927
 928         return 0;
 929
 930 err_send_cm:
 931 err_modify:
 932         ib_destroy_cm_id(p->id);
 933 err_id:
 934         p->id = NULL;
 935         ib_destroy_qp(p->qp);
 936 err_qp:
 937         p->qp = NULL;
 938 err_tx:
 939         return ret;
 940 }
 941
 942 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
 943 {
 944         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 945         struct ipoib_tx_buf *tx_req;
 946         unsigned long flags;
 947         unsigned long begin;
 948
 949         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
 950                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
 951
 952         if (p->id)
 953                 ib_destroy_cm_id(p->id);
 954
 955         if (p->tx_ring) {
 956                 /* Wait for all sends to complete */
 957                 begin = jiffies;
 958                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
 959                         if (time_after(jiffies, begin + 5 * HZ)) {
 960                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
 961                                            p->tx_head - p->tx_tail);
 962                                 goto timeout;
 963                         }
 964
 965                         msleep(1);
 966                 }
 967         }
 968
 969 timeout:
 970
 971         while ((int) p->tx_tail - (int) p->tx_head < 0) {
 972                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
 973                 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
 974                                     DMA_TO_DEVICE);
 975                 dev_kfree_skb_any(tx_req->skb);
 976                 ++p->tx_tail;
 977                 spin_lock_irqsave(&priv->tx_lock, flags);
 978                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 979                     netif_queue_stopped(p->dev) &&
 980                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 981                         netif_wake_queue(p->dev);
 982                 spin_unlock_irqrestore(&priv->tx_lock, flags);
 983         }
 984
 985         if (p->qp)
 986                 ib_destroy_qp(p->qp);
 987
 988         kfree(p->tx_ring);
 989         kfree(p);
 990 }
 991
 992 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
 993                                struct ib_cm_event *event)
 994 {
 995         struct ipoib_cm_tx *tx = cm_id->context;
 996         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
 997         struct net_device *dev = priv->dev;
 998         struct ipoib_neigh *neigh;
 999         int ret;
1000
1001         switch (event->event) {
1002         case IB_CM_DREQ_RECEIVED:
1003                 ipoib_dbg(priv, "DREQ received.\n");
1004                 ib_send_cm_drep(cm_id, NULL, 0);
1005                 break;
1006         case IB_CM_REP_RECEIVED:
1007                 ipoib_dbg(priv, "REP received.\n");
1008                 ret = ipoib_cm_rep_handler(cm_id, event);
1009                 if (ret)
1010                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1011                                        NULL, 0, NULL, 0);
1012                 break;
1013         case IB_CM_REQ_ERROR:
1014         case IB_CM_REJ_RECEIVED:
1015         case IB_CM_TIMEWAIT_EXIT:
1016                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1017                 spin_lock_irq(&priv->tx_lock);
1018                 spin_lock(&priv->lock);
1019                 neigh = tx->neigh;
1020
1021                 if (neigh) {
1022                         neigh->cm = NULL;
1023                         list_del(&neigh->list);
1024                         if (neigh->ah)
1025                                 ipoib_put_ah(neigh->ah);
1026                         ipoib_neigh_free(dev, neigh);
1027
1028                         tx->neigh = NULL;
1029                 }
1030
1031                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1032                         list_move(&tx->list, &priv->cm.reap_list);
1033                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
1034                 }
1035
1036                 spin_unlock(&priv->lock);
1037                 spin_unlock_irq(&priv->tx_lock);
1038                 break;
1039         default:
1040                 break;
1041         }
1042
1043         return 0;
1044 }
1045
1046 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1047                                        struct ipoib_neigh *neigh)
1048 {
1049         struct ipoib_dev_priv *priv = netdev_priv(dev);
1050         struct ipoib_cm_tx *tx;
1051
1052         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1053         if (!tx)
1054                 return NULL;
1055
1056         neigh->cm = tx;
1057         tx->neigh = neigh;
1058         tx->path = path;
1059         tx->dev = dev;
1060         list_add(&tx->list, &priv->cm.start_list);
1061         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1062         queue_work(ipoib_workqueue, &priv->cm.start_task);
1063         return tx;
1064 }
1065
1066 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1067 {
1068         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1069         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1070                 list_move(&tx->list, &priv->cm.reap_list);
1071                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1072                 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
1073                           IPOIB_GID_ARG(tx->neigh->dgid));
1074                 tx->neigh = NULL;
1075         }
1076 }
1077
1078 static void ipoib_cm_tx_start(struct work_struct *work)
1079 {
1080         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1081                                                    cm.start_task);
1082         struct net_device *dev = priv->dev;
1083         struct ipoib_neigh *neigh;
1084         struct ipoib_cm_tx *p;
1085         unsigned long flags;
1086         int ret;
1087
1088         struct ib_sa_path_rec pathrec;
1089         u32 qpn;
1090
1091         spin_lock_irqsave(&priv->tx_lock, flags);
1092         spin_lock(&priv->lock);
1093         while (!list_empty(&priv->cm.start_list)) {
1094                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1095                 list_del_init(&p->list);
1096                 neigh = p->neigh;
1097                 qpn = IPOIB_QPN(neigh->neighbour->ha);
1098                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1099                 spin_unlock(&priv->lock);
1100                 spin_unlock_irqrestore(&priv->tx_lock, flags);
1101                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1102                 spin_lock_irqsave(&priv->tx_lock, flags);
1103                 spin_lock(&priv->lock);
1104                 if (ret) {
1105                         neigh = p->neigh;
1106                         if (neigh) {
1107                                 neigh->cm = NULL;
1108                                 list_del(&neigh->list);
1109                                 if (neigh->ah)
1110                                         ipoib_put_ah(neigh->ah);
1111                                 ipoib_neigh_free(dev, neigh);
1112                         }
1113                         list_del(&p->list);
1114                         kfree(p);
1115                 }
1116         }
1117         spin_unlock(&priv->lock);
1118         spin_unlock_irqrestore(&priv->tx_lock, flags);
1119 }
1120
1121 static void ipoib_cm_tx_reap(struct work_struct *work)
1122 {
1123         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1124                                                    cm.reap_task);
1125         struct ipoib_cm_tx *p;
1126
1127         spin_lock_irq(&priv->tx_lock);
1128         spin_lock(&priv->lock);
1129         while (!list_empty(&priv->cm.reap_list)) {
1130                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1131                 list_del(&p->list);
1132                 spin_unlock(&priv->lock);
1133                 spin_unlock_irq(&priv->tx_lock);
1134                 ipoib_cm_tx_destroy(p);
1135                 spin_lock_irq(&priv->tx_lock);
1136                 spin_lock(&priv->lock);
1137         }
1138         spin_unlock(&priv->lock);
1139         spin_unlock_irq(&priv->tx_lock);
1140 }
1141
1142 static void ipoib_cm_skb_reap(struct work_struct *work)
1143 {
1144         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1145                                                    cm.skb_task);
1146         struct sk_buff *skb;
1147
1148         unsigned mtu = priv->mcast_mtu;
1149
1150         spin_lock_irq(&priv->tx_lock);
1151         spin_lock(&priv->lock);
1152         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1153                 spin_unlock(&priv->lock);
1154                 spin_unlock_irq(&priv->tx_lock);
1155                 if (skb->protocol == htons(ETH_P_IP))
1156                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1157 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1158                 else if (skb->protocol == htons(ETH_P_IPV6))
1159                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev);
1160 #endif
1161                 dev_kfree_skb_any(skb);
1162                 spin_lock_irq(&priv->tx_lock);
1163                 spin_lock(&priv->lock);
1164         }
1165         spin_unlock(&priv->lock);
1166         spin_unlock_irq(&priv->tx_lock);
1167 }
1168
1169 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1170                            unsigned int mtu)
1171 {
1172         struct ipoib_dev_priv *priv = netdev_priv(dev);
1173         int e = skb_queue_empty(&priv->cm.skb_queue);
1174
1175         if (skb->dst)
1176                 skb->dst->ops->update_pmtu(skb->dst, mtu);
1177
1178         skb_queue_tail(&priv->cm.skb_queue, skb);
1179         if (e)
1180                 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1181 }
1182
1183 static void ipoib_cm_rx_reap(struct work_struct *work)
1184 {
1185         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1186                                                    cm.rx_reap_task);
1187         struct ipoib_cm_rx *p, *n;
1188         LIST_HEAD(list);
1189
1190         spin_lock_irq(&priv->lock);
1191         list_splice_init(&priv->cm.rx_reap_list, &list);
1192         spin_unlock_irq(&priv->lock);
1193
1194         list_for_each_entry_safe(p, n, &list, list) {
1195                 ib_destroy_cm_id(p->id);
1196                 ib_destroy_qp(p->qp);
1197                 kfree(p);
1198         }
1199 }
1200
1201 static void ipoib_cm_stale_task(struct work_struct *work)
1202 {
1203         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1204                                                    cm.stale_task.work);
1205         struct ipoib_cm_rx *p;
1206         int ret;
1207
1208         spin_lock_irq(&priv->lock);
1209         while (!list_empty(&priv->cm.passive_ids)) {
1210                 /* List is sorted by LRU, start from tail,
1211                  * stop when we see a recently used entry */
1212                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1213                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1214                         break;
1215                 list_move(&p->list, &priv->cm.rx_error_list);
1216                 p->state = IPOIB_CM_RX_ERROR;
1217                 spin_unlock_irq(&priv->lock);
1218                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1219                 if (ret)
1220                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1221                 spin_lock_irq(&priv->lock);
1222         }
1223
1224         if (!list_empty(&priv->cm.passive_ids))
1225                 queue_delayed_work(ipoib_workqueue,
1226                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1227         spin_unlock_irq(&priv->lock);
1228 }
1229
1230
1231 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1232                          char *buf)
1233 {
1234         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1235
1236         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1237                 return sprintf(buf, "connected\n");
1238         else
1239                 return sprintf(buf, "datagram\n");
1240 }
1241
1242 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1243                         const char *buf, size_t count)
1244 {
1245         struct net_device *dev = to_net_dev(d);
1246         struct ipoib_dev_priv *priv = netdev_priv(dev);
1247
1248         /* flush paths if we switch modes so that connections are restarted */
1249         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1250                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1251                 ipoib_warn(priv, "enabling connected mode "
1252                            "will cause multicast packet drops\n");
1253                 ipoib_flush_paths(dev);
1254                 return count;
1255         }
1256
1257         if (!strcmp(buf, "datagram\n")) {
1258                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1259                 dev->mtu = min(priv->mcast_mtu, dev->mtu);
1260                 ipoib_flush_paths(dev);
1261                 return count;
1262         }
1263
1264         return -EINVAL;
1265 }
1266
1267 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1268
1269 int ipoib_cm_add_mode_attr(struct net_device *dev)
1270 {
1271         return device_create_file(&dev->dev, &dev_attr_mode);
1272 }
1273
1274 int ipoib_cm_dev_init(struct net_device *dev)
1275 {
1276         struct ipoib_dev_priv *priv = netdev_priv(dev);
1277         struct ib_srq_init_attr srq_init_attr = {
1278                 .attr = {
1279                         .max_wr  = ipoib_recvq_size,
1280                         .max_sge = IPOIB_CM_RX_SG
1281                 }
1282         };
1283         int ret, i;
1284
1285         INIT_LIST_HEAD(&priv->cm.passive_ids);
1286         INIT_LIST_HEAD(&priv->cm.reap_list);
1287         INIT_LIST_HEAD(&priv->cm.start_list);
1288         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1289         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1290         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1291         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1292         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1293         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1294         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1295         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1296         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1297
1298         skb_queue_head_init(&priv->cm.skb_queue);
1299
1300         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1301         if (IS_ERR(priv->cm.srq)) {
1302                 ret = PTR_ERR(priv->cm.srq);
1303                 priv->cm.srq = NULL;
1304                 return ret;
1305         }
1306
1307         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1308                                     GFP_KERNEL);
1309         if (!priv->cm.srq_ring) {
1310                 printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
1311                        priv->ca->name, ipoib_recvq_size);
1312                 ipoib_cm_dev_cleanup(dev);
1313                 return -ENOMEM;
1314         }
1315
1316         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
1317                 priv->cm.rx_sge[i].lkey = priv->mr->lkey;
1318
1319         priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
1320         for (i = 1; i < IPOIB_CM_RX_SG; ++i)
1321                 priv->cm.rx_sge[i].length = PAGE_SIZE;
1322         priv->cm.rx_wr.next = NULL;
1323         priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
1324         priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;
1325
1326         for (i = 0; i < ipoib_recvq_size; ++i) {
1327                 if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1,
1328                                            priv->cm.srq_ring[i].mapping)) {
1329                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
1330                         ipoib_cm_dev_cleanup(dev);
1331                         return -ENOMEM;
1332                 }
1333                 if (ipoib_cm_post_receive(dev, i)) {
1334                         ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
1335                         ipoib_cm_dev_cleanup(dev);
1336                         return -EIO;
1337                 }
1338         }
1339
1340         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1341         return 0;
1342 }
1343
1344 void ipoib_cm_dev_cleanup(struct net_device *dev)
1345 {
1346         struct ipoib_dev_priv *priv = netdev_priv(dev);
1347         int ret;
1348
1349         if (!priv->cm.srq)
1350                 return;
1351
1352         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1353
1354         ret = ib_destroy_srq(priv->cm.srq);
1355         if (ret)
1356                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1357
1358         priv->cm.srq = NULL;
1359         if (!priv->cm.srq_ring)
1360                 return;
1361
1362         ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1363         priv->cm.srq_ring = NULL;
1364 }