drivers/infiniband/ulp/ipoib/ipoib_cm.c

   1 /*
   2  * Copyright (c) 2006 Mellanox Technologies. All rights reserved
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <rdma/ib_cm.h>
  34 #include <rdma/ib_cache.h>
  35 #include <net/dst.h>
  36 #include <net/icmp.h>
  37 #include <linux/icmpv6.h>
  38 #include <linux/delay.h>
  39 #include <linux/vmalloc.h>
  40
  41 #include "ipoib.h"
  42
  43 int ipoib_max_conn_qp = 128;
  44
  45 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
  46 MODULE_PARM_DESC(max_nonsrq_conn_qp,
  47                  "Max number of connected-mode QPs per interface "
  48                  "(applied only if shared receive queue is not available)");
  49
  50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  51 static int data_debug_level;
  52
  53 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  54 MODULE_PARM_DESC(cm_data_debug_level,
  55                  "Enable data path debug tracing for connected mode if > 0");
  56 #endif
  57
  58 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  59
  60 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
  61 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
  62 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
  63 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
  64
  65 static struct ib_qp_attr ipoib_cm_err_attr = {
  66         .qp_state = IB_QPS_ERR
  67 };
  68
  69 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
  70
  71 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  72         .wr_id = IPOIB_CM_RX_DRAIN_WRID,
  73         .opcode = IB_WR_SEND,
  74 };
  75
  76 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  77                                struct ib_cm_event *event);
  78
  79 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
  80                                   u64 mapping[IPOIB_CM_RX_SG])
  81 {
  82         int i;
  83
  84         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
  85
  86         for (i = 0; i < frags; ++i)
  87                 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
  88 }
  89
  90 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
  91 {
  92         struct ipoib_dev_priv *priv = netdev_priv(dev);
  93         struct ib_recv_wr *bad_wr;
  94         int i, ret;
  95
  96         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
  97
  98         for (i = 0; i < priv->cm.num_frags; ++i)
  99                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
 100
 101         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
 102         if (unlikely(ret)) {
 103                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
 104                 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
 105                                       priv->cm.srq_ring[id].mapping);
 106                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
 107                 priv->cm.srq_ring[id].skb = NULL;
 108         }
 109
 110         return ret;
 111 }
 112
 113 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
 114                                         struct ipoib_cm_rx *rx,
 115                                         struct ib_recv_wr *wr,
 116                                         struct ib_sge *sge, int id)
 117 {
 118         struct ipoib_dev_priv *priv = netdev_priv(dev);
 119         struct ib_recv_wr *bad_wr;
 120         int i, ret;
 121
 122         wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 123
 124         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
 125                 sge[i].addr = rx->rx_ring[id].mapping[i];
 126
 127         ret = ib_post_recv(rx->qp, wr, &bad_wr);
 128         if (unlikely(ret)) {
 129                 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
 130                 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 131                                       rx->rx_ring[id].mapping);
 132                 dev_kfree_skb_any(rx->rx_ring[id].skb);
 133                 rx->rx_ring[id].skb = NULL;
 134         }
 135
 136         return ret;
 137 }
 138
 139 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
 140                                              struct ipoib_cm_rx_buf *rx_ring,
 141                                              int id, int frags,
 142                                              u64 mapping[IPOIB_CM_RX_SG])
 143 {
 144         struct ipoib_dev_priv *priv = netdev_priv(dev);
 145         struct sk_buff *skb;
 146         int i;
 147
 148         skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
 149         if (unlikely(!skb))
 150                 return NULL;
 151
 152         /*
 153          * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
 154          * IP header to a multiple of 16.
 155          */
 156         skb_reserve(skb, 12);
 157
 158         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 159                                        DMA_FROM_DEVICE);
 160         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 161                 dev_kfree_skb_any(skb);
 162                 return NULL;
 163         }
 164
 165         for (i = 0; i < frags; i++) {
 166                 struct page *page = alloc_page(GFP_ATOMIC);
 167
 168                 if (!page)
 169                         goto partial_error;
 170                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 171
 172                 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
 173                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
 174                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 175                         goto partial_error;
 176         }
 177
 178         rx_ring[id].skb = skb;
 179         return skb;
 180
 181 partial_error:
 182
 183         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 184
 185         for (; i > 0; --i)
 186                 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
 187
 188         dev_kfree_skb_any(skb);
 189         return NULL;
 190 }
 191
 192 static void ipoib_cm_free_rx_ring(struct net_device *dev,
 193                                   struct ipoib_cm_rx_buf *rx_ring)
 194 {
 195         struct ipoib_dev_priv *priv = netdev_priv(dev);
 196         int i;
 197
 198         for (i = 0; i < ipoib_recvq_size; ++i)
 199                 if (rx_ring[i].skb) {
 200                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 201                                               rx_ring[i].mapping);
 202                         dev_kfree_skb_any(rx_ring[i].skb);
 203                 }
 204
 205         kfree(rx_ring);
 206 }
 207
 208 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 209 {
 210         struct ib_send_wr *bad_wr;
 211         struct ipoib_cm_rx *p;
 212
 213         /* We only reserved 1 extra slot in CQ for drain WRs, so
 214          * make sure we have at most 1 outstanding WR. */
 215         if (list_empty(&priv->cm.rx_flush_list) ||
 216             !list_empty(&priv->cm.rx_drain_list))
 217                 return;
 218
 219         /*
 220          * QPs on flush list are error state.  This way, a "flush
 221          * error" WC will be immediately generated for each WR we post.
 222          */
 223         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 224         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
 225                 ipoib_warn(priv, "failed to post drain wr\n");
 226
 227         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 228 }
 229
 230 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 231 {
 232         struct ipoib_cm_rx *p = ctx;
 233         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 234         unsigned long flags;
 235
 236         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 237                 return;
 238
 239         spin_lock_irqsave(&priv->lock, flags);
 240         list_move(&p->list, &priv->cm.rx_flush_list);
 241         p->state = IPOIB_CM_RX_FLUSH;
 242         ipoib_cm_start_rx_drain(priv);
 243         spin_unlock_irqrestore(&priv->lock, flags);
 244 }
 245
 246 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 247                                            struct ipoib_cm_rx *p)
 248 {
 249         struct ipoib_dev_priv *priv = netdev_priv(dev);
 250         struct ib_qp_init_attr attr = {
 251                 .event_handler = ipoib_cm_rx_event_handler,
 252                 .send_cq = priv->recv_cq, /* For drain WR */
 253                 .recv_cq = priv->recv_cq,
 254                 .srq = priv->cm.srq,
 255                 .cap.max_send_wr = 1, /* For drain WR */
 256                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 257                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 258                 .qp_type = IB_QPT_RC,
 259                 .qp_context = p,
 260         };
 261
 262         if (!ipoib_cm_has_srq(dev)) {
 263                 attr.cap.max_recv_wr  = ipoib_recvq_size;
 264                 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
 265         }
 266
 267         return ib_create_qp(priv->pd, &attr);
 268 }
 269
 270 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 271                                  struct ib_cm_id *cm_id, struct ib_qp *qp,
 272                                  unsigned psn)
 273 {
 274         struct ipoib_dev_priv *priv = netdev_priv(dev);
 275         struct ib_qp_attr qp_attr;
 276         int qp_attr_mask, ret;
 277
 278         qp_attr.qp_state = IB_QPS_INIT;
 279         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 280         if (ret) {
 281                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 282                 return ret;
 283         }
 284         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 285         if (ret) {
 286                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 287                 return ret;
 288         }
 289         qp_attr.qp_state = IB_QPS_RTR;
 290         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 291         if (ret) {
 292                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 293                 return ret;
 294         }
 295         qp_attr.rq_psn = psn;
 296         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 297         if (ret) {
 298                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 299                 return ret;
 300         }
 301
 302         /*
 303          * Current Mellanox HCA firmware won't generate completions
 304          * with error for drain WRs unless the QP has been moved to
 305          * RTS first. This work-around leaves a window where a QP has
 306          * moved to error asynchronously, but this will eventually get
 307          * fixed in firmware, so let's not error out if modify QP
 308          * fails.
 309          */
 310         qp_attr.qp_state = IB_QPS_RTS;
 311         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 312         if (ret) {
 313                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 314                 return 0;
 315         }
 316         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 317         if (ret) {
 318                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 319                 return 0;
 320         }
 321
 322         return 0;
 323 }
 324
 325 static void ipoib_cm_init_rx_wr(struct net_device *dev,
 326                                 struct ib_recv_wr *wr,
 327                                 struct ib_sge *sge)
 328 {
 329         struct ipoib_dev_priv *priv = netdev_priv(dev);
 330         int i;
 331
 332         for (i = 0; i < priv->cm.num_frags; ++i)
 333                 sge[i].lkey = priv->mr->lkey;
 334
 335         sge[0].length = IPOIB_CM_HEAD_SIZE;
 336         for (i = 1; i < priv->cm.num_frags; ++i)
 337                 sge[i].length = PAGE_SIZE;
 338
 339         wr->next    = NULL;
 340         wr->sg_list = priv->cm.rx_sge;
 341         wr->num_sge = priv->cm.num_frags;
 342 }
 343
 344 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
 345                                    struct ipoib_cm_rx *rx)
 346 {
 347         struct ipoib_dev_priv *priv = netdev_priv(dev);
 348         struct {
 349                 struct ib_recv_wr wr;
 350                 struct ib_sge sge[IPOIB_CM_RX_SG];
 351         } *t;
 352         int ret;
 353         int i;
 354
 355         rx->rx_ring = kcalloc(ipoib_recvq_size, sizeof *rx->rx_ring, GFP_KERNEL);
 356         if (!rx->rx_ring)
 357                 return -ENOMEM;
 358
 359         t = kmalloc(sizeof *t, GFP_KERNEL);
 360         if (!t) {
 361                 ret = -ENOMEM;
 362                 goto err_free;
 363         }
 364
 365         ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
 366
 367         spin_lock_irq(&priv->lock);
 368
 369         if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
 370                 spin_unlock_irq(&priv->lock);
 371                 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
 372                 ret = -EINVAL;
 373                 goto err_free;
 374         } else
 375                 ++priv->cm.nonsrq_conn_qp;
 376
 377         spin_unlock_irq(&priv->lock);
 378
 379         for (i = 0; i < ipoib_recvq_size; ++i) {
 380                 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
 381                                            rx->rx_ring[i].mapping)) {
 382                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 383                                 ret = -ENOMEM;
 384                                 goto err_count;
 385                 }
 386                 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
 387                 if (ret) {
 388                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
 389                                    "failed for buf %d\n", i);
 390                         ret = -EIO;
 391                         goto err_count;
 392                 }
 393         }
 394
 395         rx->recv_count = ipoib_recvq_size;
 396
 397         kfree(t);
 398
 399         return 0;
 400
 401 err_count:
 402         spin_lock_irq(&priv->lock);
 403         --priv->cm.nonsrq_conn_qp;
 404         spin_unlock_irq(&priv->lock);
 405
 406 err_free:
 407         kfree(t);
 408         ipoib_cm_free_rx_ring(dev, rx->rx_ring);
 409
 410         return ret;
 411 }
 412
 413 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 414                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 415                              unsigned psn)
 416 {
 417         struct ipoib_dev_priv *priv = netdev_priv(dev);
 418         struct ipoib_cm_data data = {};
 419         struct ib_cm_rep_param rep = {};
 420
 421         data.qpn = cpu_to_be32(priv->qp->qp_num);
 422         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 423
 424         rep.private_data = &data;
 425         rep.private_data_len = sizeof data;
 426         rep.flow_control = 0;
 427         rep.rnr_retry_count = req->rnr_retry_count;
 428         rep.srq = ipoib_cm_has_srq(dev);
 429         rep.qp_num = qp->qp_num;
 430         rep.starting_psn = psn;
 431         return ib_send_cm_rep(cm_id, &rep);
 432 }
 433
 434 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 435 {
 436         struct net_device *dev = cm_id->context;
 437         struct ipoib_dev_priv *priv = netdev_priv(dev);
 438         struct ipoib_cm_rx *p;
 439         unsigned psn;
 440         int ret;
 441
 442         ipoib_dbg(priv, "REQ arrived\n");
 443         p = kzalloc(sizeof *p, GFP_KERNEL);
 444         if (!p)
 445                 return -ENOMEM;
 446         p->dev = dev;
 447         p->id = cm_id;
 448         cm_id->context = p;
 449         p->state = IPOIB_CM_RX_LIVE;
 450         p->jiffies = jiffies;
 451         INIT_LIST_HEAD(&p->list);
 452
 453         p->qp = ipoib_cm_create_rx_qp(dev, p);
 454         if (IS_ERR(p->qp)) {
 455                 ret = PTR_ERR(p->qp);
 456                 goto err_qp;
 457         }
 458
 459         psn = random32() & 0xffffff;
 460         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 461         if (ret)
 462                 goto err_modify;
 463
 464         if (!ipoib_cm_has_srq(dev)) {
 465                 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
 466                 if (ret)
 467                         goto err_modify;
 468         }
 469
 470         spin_lock_irq(&priv->lock);
 471         queue_delayed_work(ipoib_workqueue,
 472                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 473         /* Add this entry to passive ids list head, but do not re-add it
 474          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 475         p->jiffies = jiffies;
 476         if (p->state == IPOIB_CM_RX_LIVE)
 477                 list_move(&p->list, &priv->cm.passive_ids);
 478         spin_unlock_irq(&priv->lock);
 479
 480         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 481         if (ret) {
 482                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 483                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 484                         ipoib_warn(priv, "unable to move qp to error state\n");
 485         }
 486         return 0;
 487
 488 err_modify:
 489         ib_destroy_qp(p->qp);
 490 err_qp:
 491         kfree(p);
 492         return ret;
 493 }
 494
 495 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 496                                struct ib_cm_event *event)
 497 {
 498         struct ipoib_cm_rx *p;
 499         struct ipoib_dev_priv *priv;
 500
 501         switch (event->event) {
 502         case IB_CM_REQ_RECEIVED:
 503                 return ipoib_cm_req_handler(cm_id, event);
 504         case IB_CM_DREQ_RECEIVED:
 505                 p = cm_id->context;
 506                 ib_send_cm_drep(cm_id, NULL, 0);
 507                 /* Fall through */
 508         case IB_CM_REJ_RECEIVED:
 509                 p = cm_id->context;
 510                 priv = netdev_priv(p->dev);
 511                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 512                         ipoib_warn(priv, "unable to move qp to error state\n");
 513                 /* Fall through */
 514         default:
 515                 return 0;
 516         }
 517 }
 518 /* Adjust length of skb with fragments to match received data */
 519 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 520                           unsigned int length, struct sk_buff *toskb)
 521 {
 522         int i, num_frags;
 523         unsigned int size;
 524
 525         /* put header into skb */
 526         size = min(length, hdr_space);
 527         skb->tail += size;
 528         skb->len += size;
 529         length -= size;
 530
 531         num_frags = skb_shinfo(skb)->nr_frags;
 532         for (i = 0; i < num_frags; i++) {
 533                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 534
 535                 if (length == 0) {
 536                         /* don't need this page */
 537                         skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
 538                         --skb_shinfo(skb)->nr_frags;
 539                 } else {
 540                         size = min(length, (unsigned) PAGE_SIZE);
 541
 542                         frag->size = size;
 543                         skb->data_len += size;
 544                         skb->truesize += size;
 545                         skb->len += size;
 546                         length -= size;
 547                 }
 548         }
 549 }
 550
 551 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 552 {
 553         struct ipoib_dev_priv *priv = netdev_priv(dev);
 554         struct ipoib_cm_rx_buf *rx_ring;
 555         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
 556         struct sk_buff *skb, *newskb;
 557         struct ipoib_cm_rx *p;
 558         unsigned long flags;
 559         u64 mapping[IPOIB_CM_RX_SG];
 560         int frags;
 561         int has_srq;
 562         struct sk_buff *small_skb;
 563
 564         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 565                        wr_id, wc->status);
 566
 567         if (unlikely(wr_id >= ipoib_recvq_size)) {
 568                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
 569                         spin_lock_irqsave(&priv->lock, flags);
 570                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 571                         ipoib_cm_start_rx_drain(priv);
 572                         queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
 573                         spin_unlock_irqrestore(&priv->lock, flags);
 574                 } else
 575                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 576                                    wr_id, ipoib_recvq_size);
 577                 return;
 578         }
 579
 580         p = wc->qp->qp_context;
 581
 582         has_srq = ipoib_cm_has_srq(dev);
 583         rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
 584
 585         skb = rx_ring[wr_id].skb;
 586
 587         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 588                 ipoib_dbg(priv, "cm recv error "
 589                            "(status=%d, wrid=%d vend_err %x)\n",
 590                            wc->status, wr_id, wc->vendor_err);
 591                 ++dev->stats.rx_dropped;
 592                 if (has_srq)
 593                         goto repost;
 594                 else {
 595                         if (!--p->recv_count) {
 596                                 spin_lock_irqsave(&priv->lock, flags);
 597                                 list_move(&p->list, &priv->cm.rx_reap_list);
 598                                 spin_unlock_irqrestore(&priv->lock, flags);
 599                                 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
 600                         }
 601                         return;
 602                 }
 603         }
 604
 605         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
 606                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 607                         spin_lock_irqsave(&priv->lock, flags);
 608                         p->jiffies = jiffies;
 609                         /* Move this entry to list head, but do not re-add it
 610                          * if it has been moved out of list. */
 611                         if (p->state == IPOIB_CM_RX_LIVE)
 612                                 list_move(&p->list, &priv->cm.passive_ids);
 613                         spin_unlock_irqrestore(&priv->lock, flags);
 614                 }
 615         }
 616
 617         if (wc->byte_len < IPOIB_CM_COPYBREAK) {
 618                 int dlen = wc->byte_len;
 619
 620                 small_skb = dev_alloc_skb(dlen + 12);
 621                 if (small_skb) {
 622                         skb_reserve(small_skb, 12);
 623                         ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
 624                                                    dlen, DMA_FROM_DEVICE);
 625                         skb_copy_from_linear_data(skb, small_skb->data, dlen);
 626                         ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
 627                                                       dlen, DMA_FROM_DEVICE);
 628                         skb_put(small_skb, dlen);
 629                         skb = small_skb;
 630                         goto copied;
 631                 }
 632         }
 633
 634         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
 635                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
 636
 637         newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping);
 638         if (unlikely(!newskb)) {
 639                 /*
 640                  * If we can't allocate a new RX buffer, dump
 641                  * this packet and reuse the old buffer.
 642                  */
 643                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 644                 ++dev->stats.rx_dropped;
 645                 goto repost;
 646         }
 647
 648         ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
 649         memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
 650
 651         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 652                        wc->byte_len, wc->slid);
 653
 654         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 655
 656 copied:
 657         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 658         skb_reset_mac_header(skb);
 659         skb_pull(skb, IPOIB_ENCAP_LEN);
 660
 661         dev->last_rx = jiffies;
 662         ++dev->stats.rx_packets;
 663         dev->stats.rx_bytes += skb->len;
 664
 665         skb->dev = dev;
 666         /* XXX get correct PACKET_ type here */
 667         skb->pkt_type = PACKET_HOST;
 668         netif_receive_skb(skb);
 669
 670 repost:
 671         if (has_srq) {
 672                 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
 673                         ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
 674                                    "for buf %d\n", wr_id);
 675         } else {
 676                 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
 677                                                           &priv->cm.rx_wr,
 678                                                           priv->cm.rx_sge,
 679                                                           wr_id))) {
 680                         --p->recv_count;
 681                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
 682                                    "for buf %d\n", wr_id);
 683                 }
 684         }
 685 }
 686
 687 static inline int post_send(struct ipoib_dev_priv *priv,
 688                             struct ipoib_cm_tx *tx,
 689                             unsigned int wr_id,
 690                             u64 addr, int len)
 691 {
 692         struct ib_send_wr *bad_wr;
 693
 694         priv->tx_sge[0].addr          = addr;
 695         priv->tx_sge[0].length        = len;
 696
 697         priv->tx_wr.num_sge     = 1;
 698         priv->tx_wr.wr_id       = wr_id | IPOIB_OP_CM;
 699
 700         return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
 701 }
 702
 703 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 704 {
 705         struct ipoib_dev_priv *priv = netdev_priv(dev);
 706         struct ipoib_cm_tx_buf *tx_req;
 707         u64 addr;
 708
 709         if (unlikely(skb->len > tx->mtu)) {
 710                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 711                            skb->len, tx->mtu);
 712                 ++dev->stats.tx_dropped;
 713                 ++dev->stats.tx_errors;
 714                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 715                 return;
 716         }
 717
 718         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 719                        tx->tx_head, skb->len, tx->qp->qp_num);
 720
 721         /*
 722          * We put the skb into the tx_ring _before_ we call post_send()
 723          * because it's entirely possible that the completion handler will
 724          * run before we execute anything after the post_send().  That
 725          * means we have to make sure everything is properly recorded and
 726          * our state is consistent before we call post_send().
 727          */
 728         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 729         tx_req->skb = skb;
 730         addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
 731         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 732                 ++dev->stats.tx_errors;
 733                 dev_kfree_skb_any(skb);
 734                 return;
 735         }
 736
 737         tx_req->mapping = addr;
 738
 739         if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
 740                                addr, skb->len))) {
 741                 ipoib_warn(priv, "post_send failed\n");
 742                 ++dev->stats.tx_errors;
 743                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
 744                 dev_kfree_skb_any(skb);
 745         } else {
 746                 dev->trans_start = jiffies;
 747                 ++tx->tx_head;
 748
 749                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 750                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 751                                   tx->qp->qp_num);
 752                         netif_stop_queue(dev);
 753                 }
 754         }
 755 }
 756
 757 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 758 {
 759         struct ipoib_dev_priv *priv = netdev_priv(dev);
 760         struct ipoib_cm_tx *tx = wc->qp->qp_context;
 761         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 762         struct ipoib_cm_tx_buf *tx_req;
 763         unsigned long flags;
 764
 765         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 766                        wr_id, wc->status);
 767
 768         if (unlikely(wr_id >= ipoib_sendq_size)) {
 769                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 770                            wr_id, ipoib_sendq_size);
 771                 return;
 772         }
 773
 774         tx_req = &tx->tx_ring[wr_id];
 775
 776         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
 777
 778         /* FIXME: is this right? Shouldn't we only increment on success? */
 779         ++dev->stats.tx_packets;
 780         dev->stats.tx_bytes += tx_req->skb->len;
 781
 782         dev_kfree_skb_any(tx_req->skb);
 783
 784         spin_lock_irqsave(&priv->tx_lock, flags);
 785         ++tx->tx_tail;
 786         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 787             netif_queue_stopped(dev) &&
 788             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 789                 netif_wake_queue(dev);
 790
 791         if (wc->status != IB_WC_SUCCESS &&
 792             wc->status != IB_WC_WR_FLUSH_ERR) {
 793                 struct ipoib_neigh *neigh;
 794
 795                 ipoib_dbg(priv, "failed cm send event "
 796                            "(status=%d, wrid=%d vend_err %x)\n",
 797                            wc->status, wr_id, wc->vendor_err);
 798
 799                 spin_lock(&priv->lock);
 800                 neigh = tx->neigh;
 801
 802                 if (neigh) {
 803                         neigh->cm = NULL;
 804                         list_del(&neigh->list);
 805                         if (neigh->ah)
 806                                 ipoib_put_ah(neigh->ah);
 807                         ipoib_neigh_free(dev, neigh);
 808
 809                         tx->neigh = NULL;
 810                 }
 811
 812                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 813                         list_move(&tx->list, &priv->cm.reap_list);
 814                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
 815                 }
 816
 817                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 818
 819                 spin_unlock(&priv->lock);
 820         }
 821
 822         spin_unlock_irqrestore(&priv->tx_lock, flags);
 823 }
 824
 825 int ipoib_cm_dev_open(struct net_device *dev)
 826 {
 827         struct ipoib_dev_priv *priv = netdev_priv(dev);
 828         int ret;
 829
 830         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 831                 return 0;
 832
 833         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 834         if (IS_ERR(priv->cm.id)) {
 835                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 836                 ret = PTR_ERR(priv->cm.id);
 837                 goto err_cm;
 838         }
 839
 840         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 841                            0, NULL);
 842         if (ret) {
 843                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 844                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 845                 goto err_listen;
 846         }
 847
 848         return 0;
 849
 850 err_listen:
 851         ib_destroy_cm_id(priv->cm.id);
 852 err_cm:
 853         priv->cm.id = NULL;
 854         return ret;
 855 }
 856
 857 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
 858 {
 859         struct ipoib_dev_priv *priv = netdev_priv(dev);
 860         struct ipoib_cm_rx *rx, *n;
 861         LIST_HEAD(list);
 862
 863         spin_lock_irq(&priv->lock);
 864         list_splice_init(&priv->cm.rx_reap_list, &list);
 865         spin_unlock_irq(&priv->lock);
 866
 867         list_for_each_entry_safe(rx, n, &list, list) {
 868                 ib_destroy_cm_id(rx->id);
 869                 ib_destroy_qp(rx->qp);
 870                 if (!ipoib_cm_has_srq(dev)) {
 871                         ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
 872                         spin_lock_irq(&priv->lock);
 873                         --priv->cm.nonsrq_conn_qp;
 874                         spin_unlock_irq(&priv->lock);
 875                 }
 876                 kfree(rx);
 877         }
 878 }
 879
 880 void ipoib_cm_dev_stop(struct net_device *dev)
 881 {
 882         struct ipoib_dev_priv *priv = netdev_priv(dev);
 883         struct ipoib_cm_rx *p;
 884         unsigned long begin;
 885         int ret;
 886
 887         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 888                 return;
 889
 890         ib_destroy_cm_id(priv->cm.id);
 891         priv->cm.id = NULL;
 892
 893         spin_lock_irq(&priv->lock);
 894         while (!list_empty(&priv->cm.passive_ids)) {
 895                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 896                 list_move(&p->list, &priv->cm.rx_error_list);
 897                 p->state = IPOIB_CM_RX_ERROR;
 898                 spin_unlock_irq(&priv->lock);
 899                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 900                 if (ret)
 901                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 902                 spin_lock_irq(&priv->lock);
 903         }
 904
 905         /* Wait for all RX to be drained */
 906         begin = jiffies;
 907
 908         while (!list_empty(&priv->cm.rx_error_list) ||
 909                !list_empty(&priv->cm.rx_flush_list) ||
 910                !list_empty(&priv->cm.rx_drain_list)) {
 911                 if (time_after(jiffies, begin + 5 * HZ)) {
 912                         ipoib_warn(priv, "RX drain timing out\n");
 913
 914                         /*
 915                          * assume the HW is wedged and just free up everything.
 916                          */
 917                         list_splice_init(&priv->cm.rx_flush_list,
 918                                          &priv->cm.rx_reap_list);
 919                         list_splice_init(&priv->cm.rx_error_list,
 920                                          &priv->cm.rx_reap_list);
 921                         list_splice_init(&priv->cm.rx_drain_list,
 922                                          &priv->cm.rx_reap_list);
 923                         break;
 924                 }
 925                 spin_unlock_irq(&priv->lock);
 926                 msleep(1);
 927                 ipoib_drain_cq(dev);
 928                 spin_lock_irq(&priv->lock);
 929         }
 930
 931         spin_unlock_irq(&priv->lock);
 932
 933         ipoib_cm_free_rx_reap_list(dev);
 934
 935         cancel_delayed_work(&priv->cm.stale_task);
 936 }
 937
 938 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 939 {
 940         struct ipoib_cm_tx *p = cm_id->context;
 941         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 942         struct ipoib_cm_data *data = event->private_data;
 943         struct sk_buff_head skqueue;
 944         struct ib_qp_attr qp_attr;
 945         int qp_attr_mask, ret;
 946         struct sk_buff *skb;
 947
 948         p->mtu = be32_to_cpu(data->mtu);
 949
 950         if (p->mtu <= IPOIB_ENCAP_LEN) {
 951                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 952                            p->mtu, IPOIB_ENCAP_LEN);
 953                 return -EINVAL;
 954         }
 955
 956         qp_attr.qp_state = IB_QPS_RTR;
 957         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 958         if (ret) {
 959                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 960                 return ret;
 961         }
 962
 963         qp_attr.rq_psn = 0 /* FIXME */;
 964         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 965         if (ret) {
 966                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 967                 return ret;
 968         }
 969
 970         qp_attr.qp_state = IB_QPS_RTS;
 971         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 972         if (ret) {
 973                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 974                 return ret;
 975         }
 976         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 977         if (ret) {
 978                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 979                 return ret;
 980         }
 981
 982         skb_queue_head_init(&skqueue);
 983
 984         spin_lock_irq(&priv->lock);
 985         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 986         if (p->neigh)
 987                 while ((skb = __skb_dequeue(&p->neigh->queue)))
 988                         __skb_queue_tail(&skqueue, skb);
 989         spin_unlock_irq(&priv->lock);
 990
 991         while ((skb = __skb_dequeue(&skqueue))) {
 992                 skb->dev = p->dev;
 993                 if (dev_queue_xmit(skb))
 994                         ipoib_warn(priv, "dev_queue_xmit failed "
 995                                    "to requeue packet\n");
 996         }
 997
 998         ret = ib_send_cm_rtu(cm_id, NULL, 0);
 999         if (ret) {
1000                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1001                 return ret;
1002         }
1003         return 0;
1004 }
1005
1006 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1007 {
1008         struct ipoib_dev_priv *priv = netdev_priv(dev);
1009         struct ib_qp_init_attr attr = {
1010                 .send_cq                = priv->recv_cq,
1011                 .recv_cq                = priv->recv_cq,
1012                 .srq                    = priv->cm.srq,
1013                 .cap.max_send_wr        = ipoib_sendq_size,
1014                 .cap.max_send_sge       = 1,
1015                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
1016                 .qp_type                = IB_QPT_RC,
1017                 .qp_context             = tx
1018         };
1019
1020         return ib_create_qp(priv->pd, &attr);
1021 }
1022
1023 static int ipoib_cm_send_req(struct net_device *dev,
1024                              struct ib_cm_id *id, struct ib_qp *qp,
1025                              u32 qpn,
1026                              struct ib_sa_path_rec *pathrec)
1027 {
1028         struct ipoib_dev_priv *priv = netdev_priv(dev);
1029         struct ipoib_cm_data data = {};
1030         struct ib_cm_req_param req = {};
1031
1032         data.qpn = cpu_to_be32(priv->qp->qp_num);
1033         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1034
1035         req.primary_path                = pathrec;
1036         req.alternate_path              = NULL;
1037         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1038         req.qp_num                      = qp->qp_num;
1039         req.qp_type                     = qp->qp_type;
1040         req.private_data                = &data;
1041         req.private_data_len            = sizeof data;
1042         req.flow_control                = 0;
1043
1044         req.starting_psn                = 0; /* FIXME */
1045
1046         /*
1047          * Pick some arbitrary defaults here; we could make these
1048          * module parameters if anyone cared about setting them.
1049          */
1050         req.responder_resources         = 4;
1051         req.remote_cm_response_timeout  = 20;
1052         req.local_cm_response_timeout   = 20;
1053         req.retry_count                 = 0; /* RFC draft warns against retries */
1054         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
1055         req.max_cm_retries              = 15;
1056         req.srq                         = ipoib_cm_has_srq(dev);
1057         return ib_send_cm_req(id, &req);
1058 }
1059
1060 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1061                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
1062 {
1063         struct ipoib_dev_priv *priv = netdev_priv(dev);
1064         struct ib_qp_attr qp_attr;
1065         int qp_attr_mask, ret;
1066         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1067         if (ret) {
1068                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1069                 return ret;
1070         }
1071
1072         qp_attr.qp_state = IB_QPS_INIT;
1073         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1074         qp_attr.port_num = priv->port;
1075         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1076
1077         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1078         if (ret) {
1079                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1080                 return ret;
1081         }
1082         return 0;
1083 }
1084
1085 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1086                             struct ib_sa_path_rec *pathrec)
1087 {
1088         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1089         int ret;
1090
1091         p->tx_ring = vmalloc(ipoib_sendq_size * sizeof *p->tx_ring);
1092         if (!p->tx_ring) {
1093                 ipoib_warn(priv, "failed to allocate tx ring\n");
1094                 ret = -ENOMEM;
1095                 goto err_tx;
1096         }
1097         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1098
1099         p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1100         if (IS_ERR(p->qp)) {
1101                 ret = PTR_ERR(p->qp);
1102                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1103                 goto err_qp;
1104         }
1105
1106         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1107         if (IS_ERR(p->id)) {
1108                 ret = PTR_ERR(p->id);
1109                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1110                 goto err_id;
1111         }
1112
1113         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
1114         if (ret) {
1115                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1116                 goto err_modify;
1117         }
1118
1119         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1120         if (ret) {
1121                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1122                 goto err_send_cm;
1123         }
1124
1125         ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
1126                   p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
1127
1128         return 0;
1129
1130 err_send_cm:
1131 err_modify:
1132         ib_destroy_cm_id(p->id);
1133 err_id:
1134         p->id = NULL;
1135         ib_destroy_qp(p->qp);
1136 err_qp:
1137         p->qp = NULL;
1138         vfree(p->tx_ring);
1139 err_tx:
1140         return ret;
1141 }
1142
1143 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1144 {
1145         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1146         struct ipoib_cm_tx_buf *tx_req;
1147         unsigned long flags;
1148         unsigned long begin;
1149
1150         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1151                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1152
1153         if (p->id)
1154                 ib_destroy_cm_id(p->id);
1155
1156         if (p->tx_ring) {
1157                 /* Wait for all sends to complete */
1158                 begin = jiffies;
1159                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1160                         if (time_after(jiffies, begin + 5 * HZ)) {
1161                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1162                                            p->tx_head - p->tx_tail);
1163                                 goto timeout;
1164                         }
1165
1166                         msleep(1);
1167                 }
1168         }
1169
1170 timeout:
1171
1172         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1173                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1174                 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
1175                                     DMA_TO_DEVICE);
1176                 dev_kfree_skb_any(tx_req->skb);
1177                 ++p->tx_tail;
1178                 spin_lock_irqsave(&priv->tx_lock, flags);
1179                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1180                     netif_queue_stopped(p->dev) &&
1181                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1182                         netif_wake_queue(p->dev);
1183                 spin_unlock_irqrestore(&priv->tx_lock, flags);
1184         }
1185
1186         if (p->qp)
1187                 ib_destroy_qp(p->qp);
1188
1189         vfree(p->tx_ring);
1190         kfree(p);
1191 }
1192
1193 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1194                                struct ib_cm_event *event)
1195 {
1196         struct ipoib_cm_tx *tx = cm_id->context;
1197         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1198         struct net_device *dev = priv->dev;
1199         struct ipoib_neigh *neigh;
1200         int ret;
1201
1202         switch (event->event) {
1203         case IB_CM_DREQ_RECEIVED:
1204                 ipoib_dbg(priv, "DREQ received.\n");
1205                 ib_send_cm_drep(cm_id, NULL, 0);
1206                 break;
1207         case IB_CM_REP_RECEIVED:
1208                 ipoib_dbg(priv, "REP received.\n");
1209                 ret = ipoib_cm_rep_handler(cm_id, event);
1210                 if (ret)
1211                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1212                                        NULL, 0, NULL, 0);
1213                 break;
1214         case IB_CM_REQ_ERROR:
1215         case IB_CM_REJ_RECEIVED:
1216         case IB_CM_TIMEWAIT_EXIT:
1217                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1218                 spin_lock_irq(&priv->tx_lock);
1219                 spin_lock(&priv->lock);
1220                 neigh = tx->neigh;
1221
1222                 if (neigh) {
1223                         neigh->cm = NULL;
1224                         list_del(&neigh->list);
1225                         if (neigh->ah)
1226                                 ipoib_put_ah(neigh->ah);
1227                         ipoib_neigh_free(dev, neigh);
1228
1229                         tx->neigh = NULL;
1230                 }
1231
1232                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1233                         list_move(&tx->list, &priv->cm.reap_list);
1234                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
1235                 }
1236
1237                 spin_unlock(&priv->lock);
1238                 spin_unlock_irq(&priv->tx_lock);
1239                 break;
1240         default:
1241                 break;
1242         }
1243
1244         return 0;
1245 }
1246
1247 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1248                                        struct ipoib_neigh *neigh)
1249 {
1250         struct ipoib_dev_priv *priv = netdev_priv(dev);
1251         struct ipoib_cm_tx *tx;
1252
1253         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1254         if (!tx)
1255                 return NULL;
1256
1257         neigh->cm = tx;
1258         tx->neigh = neigh;
1259         tx->path = path;
1260         tx->dev = dev;
1261         list_add(&tx->list, &priv->cm.start_list);
1262         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1263         queue_work(ipoib_workqueue, &priv->cm.start_task);
1264         return tx;
1265 }
1266
1267 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1268 {
1269         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1270         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1271                 list_move(&tx->list, &priv->cm.reap_list);
1272                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1273                 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
1274                           IPOIB_GID_ARG(tx->neigh->dgid));
1275                 tx->neigh = NULL;
1276         }
1277 }
1278
1279 static void ipoib_cm_tx_start(struct work_struct *work)
1280 {
1281         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1282                                                    cm.start_task);
1283         struct net_device *dev = priv->dev;
1284         struct ipoib_neigh *neigh;
1285         struct ipoib_cm_tx *p;
1286         unsigned long flags;
1287         int ret;
1288
1289         struct ib_sa_path_rec pathrec;
1290         u32 qpn;
1291
1292         spin_lock_irqsave(&priv->tx_lock, flags);
1293         spin_lock(&priv->lock);
1294         while (!list_empty(&priv->cm.start_list)) {
1295                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1296                 list_del_init(&p->list);
1297                 neigh = p->neigh;
1298                 qpn = IPOIB_QPN(neigh->neighbour->ha);
1299                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1300                 spin_unlock(&priv->lock);
1301                 spin_unlock_irqrestore(&priv->tx_lock, flags);
1302                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1303                 spin_lock_irqsave(&priv->tx_lock, flags);
1304                 spin_lock(&priv->lock);
1305                 if (ret) {
1306                         neigh = p->neigh;
1307                         if (neigh) {
1308                                 neigh->cm = NULL;
1309                                 list_del(&neigh->list);
1310                                 if (neigh->ah)
1311                                         ipoib_put_ah(neigh->ah);
1312                                 ipoib_neigh_free(dev, neigh);
1313                         }
1314                         list_del(&p->list);
1315                         kfree(p);
1316                 }
1317         }
1318         spin_unlock(&priv->lock);
1319         spin_unlock_irqrestore(&priv->tx_lock, flags);
1320 }
1321
1322 static void ipoib_cm_tx_reap(struct work_struct *work)
1323 {
1324         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1325                                                    cm.reap_task);
1326         struct ipoib_cm_tx *p;
1327
1328         spin_lock_irq(&priv->tx_lock);
1329         spin_lock(&priv->lock);
1330         while (!list_empty(&priv->cm.reap_list)) {
1331                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1332                 list_del(&p->list);
1333                 spin_unlock(&priv->lock);
1334                 spin_unlock_irq(&priv->tx_lock);
1335                 ipoib_cm_tx_destroy(p);
1336                 spin_lock_irq(&priv->tx_lock);
1337                 spin_lock(&priv->lock);
1338         }
1339         spin_unlock(&priv->lock);
1340         spin_unlock_irq(&priv->tx_lock);
1341 }
1342
1343 static void ipoib_cm_skb_reap(struct work_struct *work)
1344 {
1345         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1346                                                    cm.skb_task);
1347         struct sk_buff *skb;
1348
1349         unsigned mtu = priv->mcast_mtu;
1350
1351         spin_lock_irq(&priv->tx_lock);
1352         spin_lock(&priv->lock);
1353         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1354                 spin_unlock(&priv->lock);
1355                 spin_unlock_irq(&priv->tx_lock);
1356                 if (skb->protocol == htons(ETH_P_IP))
1357                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1358 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1359                 else if (skb->protocol == htons(ETH_P_IPV6))
1360                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev);
1361 #endif
1362                 dev_kfree_skb_any(skb);
1363                 spin_lock_irq(&priv->tx_lock);
1364                 spin_lock(&priv->lock);
1365         }
1366         spin_unlock(&priv->lock);
1367         spin_unlock_irq(&priv->tx_lock);
1368 }
1369
1370 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1371                            unsigned int mtu)
1372 {
1373         struct ipoib_dev_priv *priv = netdev_priv(dev);
1374         int e = skb_queue_empty(&priv->cm.skb_queue);
1375
1376         if (skb->dst)
1377                 skb->dst->ops->update_pmtu(skb->dst, mtu);
1378
1379         skb_queue_tail(&priv->cm.skb_queue, skb);
1380         if (e)
1381                 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1382 }
1383
1384 static void ipoib_cm_rx_reap(struct work_struct *work)
1385 {
1386         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1387                                                 cm.rx_reap_task)->dev);
1388 }
1389
1390 static void ipoib_cm_stale_task(struct work_struct *work)
1391 {
1392         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1393                                                    cm.stale_task.work);
1394         struct ipoib_cm_rx *p;
1395         int ret;
1396
1397         spin_lock_irq(&priv->lock);
1398         while (!list_empty(&priv->cm.passive_ids)) {
1399                 /* List is sorted by LRU, start from tail,
1400                  * stop when we see a recently used entry */
1401                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1402                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1403                         break;
1404                 list_move(&p->list, &priv->cm.rx_error_list);
1405                 p->state = IPOIB_CM_RX_ERROR;
1406                 spin_unlock_irq(&priv->lock);
1407                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1408                 if (ret)
1409                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1410                 spin_lock_irq(&priv->lock);
1411         }
1412
1413         if (!list_empty(&priv->cm.passive_ids))
1414                 queue_delayed_work(ipoib_workqueue,
1415                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1416         spin_unlock_irq(&priv->lock);
1417 }
1418
1419
1420 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1421                          char *buf)
1422 {
1423         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1424
1425         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1426                 return sprintf(buf, "connected\n");
1427         else
1428                 return sprintf(buf, "datagram\n");
1429 }
1430
1431 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1432                         const char *buf, size_t count)
1433 {
1434         struct net_device *dev = to_net_dev(d);
1435         struct ipoib_dev_priv *priv = netdev_priv(dev);
1436
1437         /* flush paths if we switch modes so that connections are restarted */
1438         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1439                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1440                 ipoib_warn(priv, "enabling connected mode "
1441                            "will cause multicast packet drops\n");
1442
1443                 rtnl_lock();
1444                 dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO);
1445                 rtnl_unlock();
1446                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
1447
1448                 ipoib_flush_paths(dev);
1449                 return count;
1450         }
1451
1452         if (!strcmp(buf, "datagram\n")) {
1453                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1454
1455                 rtnl_lock();
1456                 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags)) {
1457                         dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
1458                         if (priv->hca_caps & IB_DEVICE_UD_TSO)
1459                                 dev->features |= NETIF_F_TSO;
1460                 }
1461                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
1462                 rtnl_unlock();
1463                 ipoib_flush_paths(dev);
1464
1465                 return count;
1466         }
1467
1468         return -EINVAL;
1469 }
1470
1471 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1472
1473 int ipoib_cm_add_mode_attr(struct net_device *dev)
1474 {
1475         return device_create_file(&dev->dev, &dev_attr_mode);
1476 }
1477
1478 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1479 {
1480         struct ipoib_dev_priv *priv = netdev_priv(dev);
1481         struct ib_srq_init_attr srq_init_attr = {
1482                 .attr = {
1483                         .max_wr  = ipoib_recvq_size,
1484                         .max_sge = max_sge
1485                 }
1486         };
1487
1488         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1489         if (IS_ERR(priv->cm.srq)) {
1490                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1491                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1492                                priv->ca->name, PTR_ERR(priv->cm.srq));
1493                 priv->cm.srq = NULL;
1494                 return;
1495         }
1496
1497         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1498                                     GFP_KERNEL);
1499         if (!priv->cm.srq_ring) {
1500                 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1501                        priv->ca->name, ipoib_recvq_size);
1502                 ib_destroy_srq(priv->cm.srq);
1503                 priv->cm.srq = NULL;
1504         }
1505 }
1506
1507 int ipoib_cm_dev_init(struct net_device *dev)
1508 {
1509         struct ipoib_dev_priv *priv = netdev_priv(dev);
1510         int i, ret;
1511         struct ib_device_attr attr;
1512
1513         INIT_LIST_HEAD(&priv->cm.passive_ids);
1514         INIT_LIST_HEAD(&priv->cm.reap_list);
1515         INIT_LIST_HEAD(&priv->cm.start_list);
1516         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1517         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1518         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1519         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1520         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1521         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1522         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1523         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1524         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1525
1526         skb_queue_head_init(&priv->cm.skb_queue);
1527
1528         ret = ib_query_device(priv->ca, &attr);
1529         if (ret) {
1530                 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1531                 return ret;
1532         }
1533
1534         ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1535
1536         attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1537         ipoib_cm_create_srq(dev, attr.max_srq_sge);
1538         if (ipoib_cm_has_srq(dev)) {
1539                 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1540                 priv->cm.num_frags  = attr.max_srq_sge;
1541                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1542                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1543         } else {
1544                 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1545                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1546         }
1547
1548         ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1549
1550         if (ipoib_cm_has_srq(dev)) {
1551                 for (i = 0; i < ipoib_recvq_size; ++i) {
1552                         if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1553                                                    priv->cm.num_frags - 1,
1554                                                    priv->cm.srq_ring[i].mapping)) {
1555                                 ipoib_warn(priv, "failed to allocate "
1556                                            "receive buffer %d\n", i);
1557                                 ipoib_cm_dev_cleanup(dev);
1558                                 return -ENOMEM;
1559                         }
1560
1561                         if (ipoib_cm_post_receive_srq(dev, i)) {
1562                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1563                                            "failed for buf %d\n", i);
1564                                 ipoib_cm_dev_cleanup(dev);
1565                                 return -EIO;
1566                         }
1567                 }
1568         }
1569
1570         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1571         return 0;
1572 }
1573
1574 void ipoib_cm_dev_cleanup(struct net_device *dev)
1575 {
1576         struct ipoib_dev_priv *priv = netdev_priv(dev);
1577         int ret;
1578
1579         if (!priv->cm.srq)
1580                 return;
1581
1582         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1583
1584         ret = ib_destroy_srq(priv->cm.srq);
1585         if (ret)
1586                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1587
1588         priv->cm.srq = NULL;
1589         if (!priv->cm.srq_ring)
1590                 return;
1591
1592         ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1593         priv->cm.srq_ring = NULL;
1594 }