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 <net/dst.h>
  35 #include <net/icmp.h>
  36 #include <linux/icmpv6.h>
  37 #include <linux/delay.h>
  38 #include <linux/slab.h>
  39 #include <linux/vmalloc.h>
  40 #include <linux/moduleparam.h>
  41
  42 #include "ipoib.h"
  43
  44 int ipoib_max_conn_qp = 128;
  45
  46 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
  47 MODULE_PARM_DESC(max_nonsrq_conn_qp,
  48                  "Max number of connected-mode QPs per interface "
  49                  "(applied only if shared receive queue is not available)");
  50
  51 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  52 static int data_debug_level;
  53
  54 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  55 MODULE_PARM_DESC(cm_data_debug_level,
  56                  "Enable data path debug tracing for connected mode if > 0");
  57 #endif
  58
  59 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  60
  61 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
  62 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
  63 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
  64 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
  65
  66 #define IPOIB_CM_RX_RESERVE     (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
  67
  68 static struct ib_qp_attr ipoib_cm_err_attr = {
  69         .qp_state = IB_QPS_ERR
  70 };
  71
  72 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
  73
  74 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  75         .opcode = IB_WR_SEND,
  76 };
  77
  78 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  79                                struct ib_cm_event *event);
  80
  81 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
  82                                   u64 mapping[IPOIB_CM_RX_SG])
  83 {
  84         int i;
  85
  86         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
  87
  88         for (i = 0; i < frags; ++i)
  89                 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
  90 }
  91
  92 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
  93 {
  94         struct ipoib_dev_priv *priv = netdev_priv(dev);
  95         struct ib_recv_wr *bad_wr;
  96         int i, ret;
  97
  98         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
  99
 100         for (i = 0; i < priv->cm.num_frags; ++i)
 101                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
 102
 103         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
 104         if (unlikely(ret)) {
 105                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
 106                 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
 107                                       priv->cm.srq_ring[id].mapping);
 108                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
 109                 priv->cm.srq_ring[id].skb = NULL;
 110         }
 111
 112         return ret;
 113 }
 114
 115 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
 116                                         struct ipoib_cm_rx *rx,
 117                                         struct ib_recv_wr *wr,
 118                                         struct ib_sge *sge, int id)
 119 {
 120         struct ipoib_dev_priv *priv = netdev_priv(dev);
 121         struct ib_recv_wr *bad_wr;
 122         int i, ret;
 123
 124         wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 125
 126         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
 127                 sge[i].addr = rx->rx_ring[id].mapping[i];
 128
 129         ret = ib_post_recv(rx->qp, wr, &bad_wr);
 130         if (unlikely(ret)) {
 131                 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
 132                 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 133                                       rx->rx_ring[id].mapping);
 134                 dev_kfree_skb_any(rx->rx_ring[id].skb);
 135                 rx->rx_ring[id].skb = NULL;
 136         }
 137
 138         return ret;
 139 }
 140
 141 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
 142                                              struct ipoib_cm_rx_buf *rx_ring,
 143                                              int id, int frags,
 144                                              u64 mapping[IPOIB_CM_RX_SG],
 145                                              gfp_t gfp)
 146 {
 147         struct ipoib_dev_priv *priv = netdev_priv(dev);
 148         struct sk_buff *skb;
 149         int i;
 150
 151         skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
 152         if (unlikely(!skb))
 153                 return NULL;
 154
 155         /*
 156          * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
 157          * IP header to a multiple of 16.
 158          */
 159         skb_reserve(skb, IPOIB_CM_RX_RESERVE);
 160
 161         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 162                                        DMA_FROM_DEVICE);
 163         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 164                 dev_kfree_skb_any(skb);
 165                 return NULL;
 166         }
 167
 168         for (i = 0; i < frags; i++) {
 169                 struct page *page = alloc_page(gfp);
 170
 171                 if (!page)
 172                         goto partial_error;
 173                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 174
 175                 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
 176                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
 177                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 178                         goto partial_error;
 179         }
 180
 181         rx_ring[id].skb = skb;
 182         return skb;
 183
 184 partial_error:
 185
 186         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 187
 188         for (; i > 0; --i)
 189                 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
 190
 191         dev_kfree_skb_any(skb);
 192         return NULL;
 193 }
 194
 195 static void ipoib_cm_free_rx_ring(struct net_device *dev,
 196                                   struct ipoib_cm_rx_buf *rx_ring)
 197 {
 198         struct ipoib_dev_priv *priv = netdev_priv(dev);
 199         int i;
 200
 201         for (i = 0; i < ipoib_recvq_size; ++i)
 202                 if (rx_ring[i].skb) {
 203                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 204                                               rx_ring[i].mapping);
 205                         dev_kfree_skb_any(rx_ring[i].skb);
 206                 }
 207
 208         vfree(rx_ring);
 209 }
 210
 211 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 212 {
 213         struct ib_send_wr *bad_wr;
 214         struct ipoib_cm_rx *p;
 215
 216         /* We only reserved 1 extra slot in CQ for drain WRs, so
 217          * make sure we have at most 1 outstanding WR. */
 218         if (list_empty(&priv->cm.rx_flush_list) ||
 219             !list_empty(&priv->cm.rx_drain_list))
 220                 return;
 221
 222         /*
 223          * QPs on flush list are error state.  This way, a "flush
 224          * error" WC will be immediately generated for each WR we post.
 225          */
 226         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 227         ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
 228         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
 229                 ipoib_warn(priv, "failed to post drain wr\n");
 230
 231         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 232 }
 233
 234 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 235 {
 236         struct ipoib_cm_rx *p = ctx;
 237         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 238         unsigned long flags;
 239
 240         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 241                 return;
 242
 243         spin_lock_irqsave(&priv->lock, flags);
 244         list_move(&p->list, &priv->cm.rx_flush_list);
 245         p->state = IPOIB_CM_RX_FLUSH;
 246         ipoib_cm_start_rx_drain(priv);
 247         spin_unlock_irqrestore(&priv->lock, flags);
 248 }
 249
 250 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 251                                            struct ipoib_cm_rx *p)
 252 {
 253         struct ipoib_dev_priv *priv = netdev_priv(dev);
 254         struct ib_qp_init_attr attr = {
 255                 .event_handler = ipoib_cm_rx_event_handler,
 256                 .send_cq = priv->recv_cq, /* For drain WR */
 257                 .recv_cq = priv->recv_cq,
 258                 .srq = priv->cm.srq,
 259                 .cap.max_send_wr = 1, /* For drain WR */
 260                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 261                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 262                 .qp_type = IB_QPT_RC,
 263                 .qp_context = p,
 264         };
 265
 266         if (!ipoib_cm_has_srq(dev)) {
 267                 attr.cap.max_recv_wr  = ipoib_recvq_size;
 268                 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
 269         }
 270
 271         return ib_create_qp(priv->pd, &attr);
 272 }
 273
 274 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 275                                  struct ib_cm_id *cm_id, struct ib_qp *qp,
 276                                  unsigned psn)
 277 {
 278         struct ipoib_dev_priv *priv = netdev_priv(dev);
 279         struct ib_qp_attr qp_attr;
 280         int qp_attr_mask, ret;
 281
 282         qp_attr.qp_state = IB_QPS_INIT;
 283         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 284         if (ret) {
 285                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 286                 return ret;
 287         }
 288         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 289         if (ret) {
 290                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 291                 return ret;
 292         }
 293         qp_attr.qp_state = IB_QPS_RTR;
 294         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 295         if (ret) {
 296                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 297                 return ret;
 298         }
 299         qp_attr.rq_psn = psn;
 300         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 301         if (ret) {
 302                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 303                 return ret;
 304         }
 305
 306         /*
 307          * Current Mellanox HCA firmware won't generate completions
 308          * with error for drain WRs unless the QP has been moved to
 309          * RTS first. This work-around leaves a window where a QP has
 310          * moved to error asynchronously, but this will eventually get
 311          * fixed in firmware, so let's not error out if modify QP
 312          * fails.
 313          */
 314         qp_attr.qp_state = IB_QPS_RTS;
 315         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 316         if (ret) {
 317                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 318                 return 0;
 319         }
 320         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 321         if (ret) {
 322                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 323                 return 0;
 324         }
 325
 326         return 0;
 327 }
 328
 329 static void ipoib_cm_init_rx_wr(struct net_device *dev,
 330                                 struct ib_recv_wr *wr,
 331                                 struct ib_sge *sge)
 332 {
 333         struct ipoib_dev_priv *priv = netdev_priv(dev);
 334         int i;
 335
 336         for (i = 0; i < priv->cm.num_frags; ++i)
 337                 sge[i].lkey = priv->pd->local_dma_lkey;
 338
 339         sge[0].length = IPOIB_CM_HEAD_SIZE;
 340         for (i = 1; i < priv->cm.num_frags; ++i)
 341                 sge[i].length = PAGE_SIZE;
 342
 343         wr->next    = NULL;
 344         wr->sg_list = sge;
 345         wr->num_sge = priv->cm.num_frags;
 346 }
 347
 348 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
 349                                    struct ipoib_cm_rx *rx)
 350 {
 351         struct ipoib_dev_priv *priv = netdev_priv(dev);
 352         struct {
 353                 struct ib_recv_wr wr;
 354                 struct ib_sge sge[IPOIB_CM_RX_SG];
 355         } *t;
 356         int ret;
 357         int i;
 358
 359         rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
 360         if (!rx->rx_ring) {
 361                 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
 362                        priv->ca->name, ipoib_recvq_size);
 363                 return -ENOMEM;
 364         }
 365
 366         t = kmalloc(sizeof *t, GFP_KERNEL);
 367         if (!t) {
 368                 ret = -ENOMEM;
 369                 goto err_free;
 370         }
 371
 372         ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
 373
 374         spin_lock_irq(&priv->lock);
 375
 376         if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
 377                 spin_unlock_irq(&priv->lock);
 378                 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
 379                 ret = -EINVAL;
 380                 goto err_free;
 381         } else
 382                 ++priv->cm.nonsrq_conn_qp;
 383
 384         spin_unlock_irq(&priv->lock);
 385
 386         for (i = 0; i < ipoib_recvq_size; ++i) {
 387                 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
 388                                            rx->rx_ring[i].mapping,
 389                                            GFP_KERNEL)) {
 390                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 391                         ret = -ENOMEM;
 392                         goto err_count;
 393                 }
 394                 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
 395                 if (ret) {
 396                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
 397                                    "failed for buf %d\n", i);
 398                         ret = -EIO;
 399                         goto err_count;
 400                 }
 401         }
 402
 403         rx->recv_count = ipoib_recvq_size;
 404
 405         kfree(t);
 406
 407         return 0;
 408
 409 err_count:
 410         spin_lock_irq(&priv->lock);
 411         --priv->cm.nonsrq_conn_qp;
 412         spin_unlock_irq(&priv->lock);
 413
 414 err_free:
 415         kfree(t);
 416         ipoib_cm_free_rx_ring(dev, rx->rx_ring);
 417
 418         return ret;
 419 }
 420
 421 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 422                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 423                              unsigned psn)
 424 {
 425         struct ipoib_dev_priv *priv = netdev_priv(dev);
 426         struct ipoib_cm_data data = {};
 427         struct ib_cm_rep_param rep = {};
 428
 429         data.qpn = cpu_to_be32(priv->qp->qp_num);
 430         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 431
 432         rep.private_data = &data;
 433         rep.private_data_len = sizeof data;
 434         rep.flow_control = 0;
 435         rep.rnr_retry_count = req->rnr_retry_count;
 436         rep.srq = ipoib_cm_has_srq(dev);
 437         rep.qp_num = qp->qp_num;
 438         rep.starting_psn = psn;
 439         return ib_send_cm_rep(cm_id, &rep);
 440 }
 441
 442 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 443 {
 444         struct net_device *dev = cm_id->context;
 445         struct ipoib_dev_priv *priv = netdev_priv(dev);
 446         struct ipoib_cm_rx *p;
 447         unsigned psn;
 448         int ret;
 449
 450         ipoib_dbg(priv, "REQ arrived\n");
 451         p = kzalloc(sizeof *p, GFP_KERNEL);
 452         if (!p)
 453                 return -ENOMEM;
 454         p->dev = dev;
 455         p->id = cm_id;
 456         cm_id->context = p;
 457         p->state = IPOIB_CM_RX_LIVE;
 458         p->jiffies = jiffies;
 459         INIT_LIST_HEAD(&p->list);
 460
 461         p->qp = ipoib_cm_create_rx_qp(dev, p);
 462         if (IS_ERR(p->qp)) {
 463                 ret = PTR_ERR(p->qp);
 464                 goto err_qp;
 465         }
 466
 467         psn = prandom_u32() & 0xffffff;
 468         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 469         if (ret)
 470                 goto err_modify;
 471
 472         if (!ipoib_cm_has_srq(dev)) {
 473                 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
 474                 if (ret)
 475                         goto err_modify;
 476         }
 477
 478         spin_lock_irq(&priv->lock);
 479         queue_delayed_work(priv->wq,
 480                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 481         /* Add this entry to passive ids list head, but do not re-add it
 482          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 483         p->jiffies = jiffies;
 484         if (p->state == IPOIB_CM_RX_LIVE)
 485                 list_move(&p->list, &priv->cm.passive_ids);
 486         spin_unlock_irq(&priv->lock);
 487
 488         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 489         if (ret) {
 490                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 491                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 492                         ipoib_warn(priv, "unable to move qp to error state\n");
 493         }
 494         return 0;
 495
 496 err_modify:
 497         ib_destroy_qp(p->qp);
 498 err_qp:
 499         kfree(p);
 500         return ret;
 501 }
 502
 503 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 504                                struct ib_cm_event *event)
 505 {
 506         struct ipoib_cm_rx *p;
 507         struct ipoib_dev_priv *priv;
 508
 509         switch (event->event) {
 510         case IB_CM_REQ_RECEIVED:
 511                 return ipoib_cm_req_handler(cm_id, event);
 512         case IB_CM_DREQ_RECEIVED:
 513                 p = cm_id->context;
 514                 ib_send_cm_drep(cm_id, NULL, 0);
 515                 /* Fall through */
 516         case IB_CM_REJ_RECEIVED:
 517                 p = cm_id->context;
 518                 priv = netdev_priv(p->dev);
 519                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 520                         ipoib_warn(priv, "unable to move qp to error state\n");
 521                 /* Fall through */
 522         default:
 523                 return 0;
 524         }
 525 }
 526 /* Adjust length of skb with fragments to match received data */
 527 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 528                           unsigned int length, struct sk_buff *toskb)
 529 {
 530         int i, num_frags;
 531         unsigned int size;
 532
 533         /* put header into skb */
 534         size = min(length, hdr_space);
 535         skb->tail += size;
 536         skb->len += size;
 537         length -= size;
 538
 539         num_frags = skb_shinfo(skb)->nr_frags;
 540         for (i = 0; i < num_frags; i++) {
 541                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 542
 543                 if (length == 0) {
 544                         /* don't need this page */
 545                         skb_fill_page_desc(toskb, i, skb_frag_page(frag),
 546                                            0, PAGE_SIZE);
 547                         --skb_shinfo(skb)->nr_frags;
 548                 } else {
 549                         size = min(length, (unsigned) PAGE_SIZE);
 550
 551                         skb_frag_size_set(frag, size);
 552                         skb->data_len += size;
 553                         skb->truesize += size;
 554                         skb->len += size;
 555                         length -= size;
 556                 }
 557         }
 558 }
 559
 560 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 561 {
 562         struct ipoib_dev_priv *priv = netdev_priv(dev);
 563         struct ipoib_cm_rx_buf *rx_ring;
 564         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
 565         struct sk_buff *skb, *newskb;
 566         struct ipoib_cm_rx *p;
 567         unsigned long flags;
 568         u64 mapping[IPOIB_CM_RX_SG];
 569         int frags;
 570         int has_srq;
 571         struct sk_buff *small_skb;
 572
 573         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 574                        wr_id, wc->status);
 575
 576         if (unlikely(wr_id >= ipoib_recvq_size)) {
 577                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
 578                         spin_lock_irqsave(&priv->lock, flags);
 579                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 580                         ipoib_cm_start_rx_drain(priv);
 581                         queue_work(priv->wq, &priv->cm.rx_reap_task);
 582                         spin_unlock_irqrestore(&priv->lock, flags);
 583                 } else
 584                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 585                                    wr_id, ipoib_recvq_size);
 586                 return;
 587         }
 588
 589         p = wc->qp->qp_context;
 590
 591         has_srq = ipoib_cm_has_srq(dev);
 592         rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
 593
 594         skb = rx_ring[wr_id].skb;
 595
 596         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 597                 ipoib_dbg(priv, "cm recv error "
 598                            "(status=%d, wrid=%d vend_err %x)\n",
 599                            wc->status, wr_id, wc->vendor_err);
 600                 ++dev->stats.rx_dropped;
 601                 if (has_srq)
 602                         goto repost;
 603                 else {
 604                         if (!--p->recv_count) {
 605                                 spin_lock_irqsave(&priv->lock, flags);
 606                                 list_move(&p->list, &priv->cm.rx_reap_list);
 607                                 spin_unlock_irqrestore(&priv->lock, flags);
 608                                 queue_work(priv->wq, &priv->cm.rx_reap_task);
 609                         }
 610                         return;
 611                 }
 612         }
 613
 614         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
 615                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 616                         spin_lock_irqsave(&priv->lock, flags);
 617                         p->jiffies = jiffies;
 618                         /* Move this entry to list head, but do not re-add it
 619                          * if it has been moved out of list. */
 620                         if (p->state == IPOIB_CM_RX_LIVE)
 621                                 list_move(&p->list, &priv->cm.passive_ids);
 622                         spin_unlock_irqrestore(&priv->lock, flags);
 623                 }
 624         }
 625
 626         if (wc->byte_len < IPOIB_CM_COPYBREAK) {
 627                 int dlen = wc->byte_len;
 628
 629                 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE);
 630                 if (small_skb) {
 631                         skb_reserve(small_skb, IPOIB_CM_RX_RESERVE);
 632                         ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
 633                                                    dlen, DMA_FROM_DEVICE);
 634                         skb_copy_from_linear_data(skb, small_skb->data, dlen);
 635                         ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
 636                                                       dlen, DMA_FROM_DEVICE);
 637                         skb_put(small_skb, dlen);
 638                         skb = small_skb;
 639                         goto copied;
 640                 }
 641         }
 642
 643         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
 644                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
 645
 646         newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
 647                                        mapping, GFP_ATOMIC);
 648         if (unlikely(!newskb)) {
 649                 /*
 650                  * If we can't allocate a new RX buffer, dump
 651                  * this packet and reuse the old buffer.
 652                  */
 653                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 654                 ++dev->stats.rx_dropped;
 655                 goto repost;
 656         }
 657
 658         ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
 659         memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
 660
 661         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 662                        wc->byte_len, wc->slid);
 663
 664         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 665
 666 copied:
 667         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 668         skb_add_pseudo_hdr(skb);
 669
 670         ++dev->stats.rx_packets;
 671         dev->stats.rx_bytes += skb->len;
 672
 673         skb->dev = dev;
 674         /* XXX get correct PACKET_ type here */
 675         skb->pkt_type = PACKET_HOST;
 676         netif_receive_skb(skb);
 677
 678 repost:
 679         if (has_srq) {
 680                 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
 681                         ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
 682                                    "for buf %d\n", wr_id);
 683         } else {
 684                 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
 685                                                           &priv->cm.rx_wr,
 686                                                           priv->cm.rx_sge,
 687                                                           wr_id))) {
 688                         --p->recv_count;
 689                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
 690                                    "for buf %d\n", wr_id);
 691                 }
 692         }
 693 }
 694
 695 static inline int post_send(struct ipoib_dev_priv *priv,
 696                             struct ipoib_cm_tx *tx,
 697                             unsigned int wr_id,
 698                             struct ipoib_tx_buf *tx_req)
 699 {
 700         struct ib_send_wr *bad_wr;
 701
 702         ipoib_build_sge(priv, tx_req);
 703
 704         priv->tx_wr.wr.wr_id    = wr_id | IPOIB_OP_CM;
 705
 706         return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
 707 }
 708
 709 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 710 {
 711         struct ipoib_dev_priv *priv = netdev_priv(dev);
 712         struct ipoib_tx_buf *tx_req;
 713         int rc;
 714         unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
 715
 716         if (unlikely(skb->len > tx->mtu)) {
 717                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 718                            skb->len, tx->mtu);
 719                 ++dev->stats.tx_dropped;
 720                 ++dev->stats.tx_errors;
 721                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 722                 return;
 723         }
 724         if (skb_shinfo(skb)->nr_frags > usable_sge) {
 725                 if (skb_linearize(skb) < 0) {
 726                         ipoib_warn(priv, "skb could not be linearized\n");
 727                         ++dev->stats.tx_dropped;
 728                         ++dev->stats.tx_errors;
 729                         dev_kfree_skb_any(skb);
 730                         return;
 731                 }
 732                 /* Does skb_linearize return ok without reducing nr_frags? */
 733                 if (skb_shinfo(skb)->nr_frags > usable_sge) {
 734                         ipoib_warn(priv, "too many frags after skb linearize\n");
 735                         ++dev->stats.tx_dropped;
 736                         ++dev->stats.tx_errors;
 737                         dev_kfree_skb_any(skb);
 738                         return;
 739                 }
 740         }
 741         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 742                        tx->tx_head, skb->len, tx->qp->qp_num);
 743
 744         /*
 745          * We put the skb into the tx_ring _before_ we call post_send()
 746          * because it's entirely possible that the completion handler will
 747          * run before we execute anything after the post_send().  That
 748          * means we have to make sure everything is properly recorded and
 749          * our state is consistent before we call post_send().
 750          */
 751         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 752         tx_req->skb = skb;
 753
 754         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 755                 ++dev->stats.tx_errors;
 756                 dev_kfree_skb_any(skb);
 757                 return;
 758         }
 759
 760         skb_orphan(skb);
 761         skb_dst_drop(skb);
 762
 763         rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
 764         if (unlikely(rc)) {
 765                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 766                 ++dev->stats.tx_errors;
 767                 ipoib_dma_unmap_tx(priv, tx_req);
 768                 dev_kfree_skb_any(skb);
 769         } else {
 770                 netif_trans_update(dev);
 771                 ++tx->tx_head;
 772
 773                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 774                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 775                                   tx->qp->qp_num);
 776                         netif_stop_queue(dev);
 777                         rc = ib_req_notify_cq(priv->send_cq,
 778                                 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
 779                         if (rc < 0)
 780                                 ipoib_warn(priv, "request notify on send CQ failed\n");
 781                         else if (rc)
 782                                 ipoib_send_comp_handler(priv->send_cq, dev);
 783                 }
 784         }
 785 }
 786
 787 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 788 {
 789         struct ipoib_dev_priv *priv = netdev_priv(dev);
 790         struct ipoib_cm_tx *tx = wc->qp->qp_context;
 791         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 792         struct ipoib_tx_buf *tx_req;
 793         unsigned long flags;
 794
 795         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 796                        wr_id, wc->status);
 797
 798         if (unlikely(wr_id >= ipoib_sendq_size)) {
 799                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 800                            wr_id, ipoib_sendq_size);
 801                 return;
 802         }
 803
 804         tx_req = &tx->tx_ring[wr_id];
 805
 806         ipoib_dma_unmap_tx(priv, tx_req);
 807
 808         /* FIXME: is this right? Shouldn't we only increment on success? */
 809         ++dev->stats.tx_packets;
 810         dev->stats.tx_bytes += tx_req->skb->len;
 811
 812         dev_kfree_skb_any(tx_req->skb);
 813
 814         netif_tx_lock(dev);
 815
 816         ++tx->tx_tail;
 817         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 818             netif_queue_stopped(dev) &&
 819             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 820                 netif_wake_queue(dev);
 821
 822         if (wc->status != IB_WC_SUCCESS &&
 823             wc->status != IB_WC_WR_FLUSH_ERR) {
 824                 struct ipoib_neigh *neigh;
 825
 826                 ipoib_dbg(priv, "failed cm send event "
 827                            "(status=%d, wrid=%d vend_err %x)\n",
 828                            wc->status, wr_id, wc->vendor_err);
 829
 830                 spin_lock_irqsave(&priv->lock, flags);
 831                 neigh = tx->neigh;
 832
 833                 if (neigh) {
 834                         neigh->cm = NULL;
 835                         ipoib_neigh_free(neigh);
 836
 837                         tx->neigh = NULL;
 838                 }
 839
 840                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 841                         list_move(&tx->list, &priv->cm.reap_list);
 842                         queue_work(priv->wq, &priv->cm.reap_task);
 843                 }
 844
 845                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 846
 847                 spin_unlock_irqrestore(&priv->lock, flags);
 848         }
 849
 850         netif_tx_unlock(dev);
 851 }
 852
 853 int ipoib_cm_dev_open(struct net_device *dev)
 854 {
 855         struct ipoib_dev_priv *priv = netdev_priv(dev);
 856         int ret;
 857
 858         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 859                 return 0;
 860
 861         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 862         if (IS_ERR(priv->cm.id)) {
 863                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 864                 ret = PTR_ERR(priv->cm.id);
 865                 goto err_cm;
 866         }
 867
 868         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 869                            0);
 870         if (ret) {
 871                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 872                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 873                 goto err_listen;
 874         }
 875
 876         return 0;
 877
 878 err_listen:
 879         ib_destroy_cm_id(priv->cm.id);
 880 err_cm:
 881         priv->cm.id = NULL;
 882         return ret;
 883 }
 884
 885 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
 886 {
 887         struct ipoib_dev_priv *priv = netdev_priv(dev);
 888         struct ipoib_cm_rx *rx, *n;
 889         LIST_HEAD(list);
 890
 891         spin_lock_irq(&priv->lock);
 892         list_splice_init(&priv->cm.rx_reap_list, &list);
 893         spin_unlock_irq(&priv->lock);
 894
 895         list_for_each_entry_safe(rx, n, &list, list) {
 896                 ib_destroy_cm_id(rx->id);
 897                 ib_destroy_qp(rx->qp);
 898                 if (!ipoib_cm_has_srq(dev)) {
 899                         ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
 900                         spin_lock_irq(&priv->lock);
 901                         --priv->cm.nonsrq_conn_qp;
 902                         spin_unlock_irq(&priv->lock);
 903                 }
 904                 kfree(rx);
 905         }
 906 }
 907
 908 void ipoib_cm_dev_stop(struct net_device *dev)
 909 {
 910         struct ipoib_dev_priv *priv = netdev_priv(dev);
 911         struct ipoib_cm_rx *p;
 912         unsigned long begin;
 913         int ret;
 914
 915         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 916                 return;
 917
 918         ib_destroy_cm_id(priv->cm.id);
 919         priv->cm.id = NULL;
 920
 921         spin_lock_irq(&priv->lock);
 922         while (!list_empty(&priv->cm.passive_ids)) {
 923                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 924                 list_move(&p->list, &priv->cm.rx_error_list);
 925                 p->state = IPOIB_CM_RX_ERROR;
 926                 spin_unlock_irq(&priv->lock);
 927                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 928                 if (ret)
 929                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 930                 spin_lock_irq(&priv->lock);
 931         }
 932
 933         /* Wait for all RX to be drained */
 934         begin = jiffies;
 935
 936         while (!list_empty(&priv->cm.rx_error_list) ||
 937                !list_empty(&priv->cm.rx_flush_list) ||
 938                !list_empty(&priv->cm.rx_drain_list)) {
 939                 if (time_after(jiffies, begin + 5 * HZ)) {
 940                         ipoib_warn(priv, "RX drain timing out\n");
 941
 942                         /*
 943                          * assume the HW is wedged and just free up everything.
 944                          */
 945                         list_splice_init(&priv->cm.rx_flush_list,
 946                                          &priv->cm.rx_reap_list);
 947                         list_splice_init(&priv->cm.rx_error_list,
 948                                          &priv->cm.rx_reap_list);
 949                         list_splice_init(&priv->cm.rx_drain_list,
 950                                          &priv->cm.rx_reap_list);
 951                         break;
 952                 }
 953                 spin_unlock_irq(&priv->lock);
 954                 msleep(1);
 955                 ipoib_drain_cq(dev);
 956                 spin_lock_irq(&priv->lock);
 957         }
 958
 959         spin_unlock_irq(&priv->lock);
 960
 961         ipoib_cm_free_rx_reap_list(dev);
 962
 963         cancel_delayed_work(&priv->cm.stale_task);
 964 }
 965
 966 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 967 {
 968         struct ipoib_cm_tx *p = cm_id->context;
 969         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 970         struct ipoib_cm_data *data = event->private_data;
 971         struct sk_buff_head skqueue;
 972         struct ib_qp_attr qp_attr;
 973         int qp_attr_mask, ret;
 974         struct sk_buff *skb;
 975
 976         p->mtu = be32_to_cpu(data->mtu);
 977
 978         if (p->mtu <= IPOIB_ENCAP_LEN) {
 979                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 980                            p->mtu, IPOIB_ENCAP_LEN);
 981                 return -EINVAL;
 982         }
 983
 984         qp_attr.qp_state = IB_QPS_RTR;
 985         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 986         if (ret) {
 987                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 988                 return ret;
 989         }
 990
 991         qp_attr.rq_psn = 0 /* FIXME */;
 992         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 993         if (ret) {
 994                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 995                 return ret;
 996         }
 997
 998         qp_attr.qp_state = IB_QPS_RTS;
 999         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1000         if (ret) {
1001                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1002                 return ret;
1003         }
1004         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1005         if (ret) {
1006                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1007                 return ret;
1008         }
1009
1010         skb_queue_head_init(&skqueue);
1011
1012         spin_lock_irq(&priv->lock);
1013         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1014         if (p->neigh)
1015                 while ((skb = __skb_dequeue(&p->neigh->queue)))
1016                         __skb_queue_tail(&skqueue, skb);
1017         spin_unlock_irq(&priv->lock);
1018
1019         while ((skb = __skb_dequeue(&skqueue))) {
1020                 skb->dev = p->dev;
1021                 if (dev_queue_xmit(skb))
1022                         ipoib_warn(priv, "dev_queue_xmit failed "
1023                                    "to requeue packet\n");
1024         }
1025
1026         ret = ib_send_cm_rtu(cm_id, NULL, 0);
1027         if (ret) {
1028                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1029                 return ret;
1030         }
1031         return 0;
1032 }
1033
1034 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1035 {
1036         struct ipoib_dev_priv *priv = netdev_priv(dev);
1037         struct ib_qp_init_attr attr = {
1038                 .send_cq                = priv->recv_cq,
1039                 .recv_cq                = priv->recv_cq,
1040                 .srq                    = priv->cm.srq,
1041                 .cap.max_send_wr        = ipoib_sendq_size,
1042                 .cap.max_send_sge       = 1,
1043                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
1044                 .qp_type                = IB_QPT_RC,
1045                 .qp_context             = tx,
1046                 .create_flags           = IB_QP_CREATE_USE_GFP_NOIO
1047         };
1048
1049         struct ib_qp *tx_qp;
1050
1051         if (dev->features & NETIF_F_SG)
1052                 attr.cap.max_send_sge =
1053                         min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1054
1055         tx_qp = ib_create_qp(priv->pd, &attr);
1056         if (PTR_ERR(tx_qp) == -EINVAL) {
1057                 ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, using GFP_KERNEL\n",
1058                            priv->ca->name);
1059                 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
1060                 tx_qp = ib_create_qp(priv->pd, &attr);
1061         }
1062         tx->max_send_sge = attr.cap.max_send_sge;
1063         return tx_qp;
1064 }
1065
1066 static int ipoib_cm_send_req(struct net_device *dev,
1067                              struct ib_cm_id *id, struct ib_qp *qp,
1068                              u32 qpn,
1069                              struct ib_sa_path_rec *pathrec)
1070 {
1071         struct ipoib_dev_priv *priv = netdev_priv(dev);
1072         struct ipoib_cm_data data = {};
1073         struct ib_cm_req_param req = {};
1074
1075         data.qpn = cpu_to_be32(priv->qp->qp_num);
1076         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1077
1078         req.primary_path                = pathrec;
1079         req.alternate_path              = NULL;
1080         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1081         req.qp_num                      = qp->qp_num;
1082         req.qp_type                     = qp->qp_type;
1083         req.private_data                = &data;
1084         req.private_data_len            = sizeof data;
1085         req.flow_control                = 0;
1086
1087         req.starting_psn                = 0; /* FIXME */
1088
1089         /*
1090          * Pick some arbitrary defaults here; we could make these
1091          * module parameters if anyone cared about setting them.
1092          */
1093         req.responder_resources         = 4;
1094         req.remote_cm_response_timeout  = 20;
1095         req.local_cm_response_timeout   = 20;
1096         req.retry_count                 = 0; /* RFC draft warns against retries */
1097         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
1098         req.max_cm_retries              = 15;
1099         req.srq                         = ipoib_cm_has_srq(dev);
1100         return ib_send_cm_req(id, &req);
1101 }
1102
1103 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1104                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
1105 {
1106         struct ipoib_dev_priv *priv = netdev_priv(dev);
1107         struct ib_qp_attr qp_attr;
1108         int qp_attr_mask, ret;
1109         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1110         if (ret) {
1111                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1112                 return ret;
1113         }
1114
1115         qp_attr.qp_state = IB_QPS_INIT;
1116         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1117         qp_attr.port_num = priv->port;
1118         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1119
1120         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1121         if (ret) {
1122                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1123                 return ret;
1124         }
1125         return 0;
1126 }
1127
1128 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1129                             struct ib_sa_path_rec *pathrec)
1130 {
1131         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1132         int ret;
1133
1134         p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
1135                                GFP_NOIO, PAGE_KERNEL);
1136         if (!p->tx_ring) {
1137                 ipoib_warn(priv, "failed to allocate tx ring\n");
1138                 ret = -ENOMEM;
1139                 goto err_tx;
1140         }
1141         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1142
1143         p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1144         if (IS_ERR(p->qp)) {
1145                 ret = PTR_ERR(p->qp);
1146                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1147                 goto err_qp;
1148         }
1149
1150         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1151         if (IS_ERR(p->id)) {
1152                 ret = PTR_ERR(p->id);
1153                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1154                 goto err_id;
1155         }
1156
1157         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
1158         if (ret) {
1159                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1160                 goto err_modify;
1161         }
1162
1163         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1164         if (ret) {
1165                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1166                 goto err_send_cm;
1167         }
1168
1169         ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1170                   p->qp->qp_num, pathrec->dgid.raw, qpn);
1171
1172         return 0;
1173
1174 err_send_cm:
1175 err_modify:
1176         ib_destroy_cm_id(p->id);
1177 err_id:
1178         p->id = NULL;
1179         ib_destroy_qp(p->qp);
1180 err_qp:
1181         p->qp = NULL;
1182         vfree(p->tx_ring);
1183 err_tx:
1184         return ret;
1185 }
1186
1187 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1188 {
1189         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1190         struct ipoib_tx_buf *tx_req;
1191         unsigned long begin;
1192
1193         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1194                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1195
1196         if (p->id)
1197                 ib_destroy_cm_id(p->id);
1198
1199         if (p->tx_ring) {
1200                 /* Wait for all sends to complete */
1201                 begin = jiffies;
1202                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1203                         if (time_after(jiffies, begin + 5 * HZ)) {
1204                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1205                                            p->tx_head - p->tx_tail);
1206                                 goto timeout;
1207                         }
1208
1209                         msleep(1);
1210                 }
1211         }
1212
1213 timeout:
1214
1215         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1216                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1217                 ipoib_dma_unmap_tx(priv, tx_req);
1218                 dev_kfree_skb_any(tx_req->skb);
1219                 ++p->tx_tail;
1220                 netif_tx_lock_bh(p->dev);
1221                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1222                     netif_queue_stopped(p->dev) &&
1223                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1224                         netif_wake_queue(p->dev);
1225                 netif_tx_unlock_bh(p->dev);
1226         }
1227
1228         if (p->qp)
1229                 ib_destroy_qp(p->qp);
1230
1231         vfree(p->tx_ring);
1232         kfree(p);
1233 }
1234
1235 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1236                                struct ib_cm_event *event)
1237 {
1238         struct ipoib_cm_tx *tx = cm_id->context;
1239         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1240         struct net_device *dev = priv->dev;
1241         struct ipoib_neigh *neigh;
1242         unsigned long flags;
1243         int ret;
1244
1245         switch (event->event) {
1246         case IB_CM_DREQ_RECEIVED:
1247                 ipoib_dbg(priv, "DREQ received.\n");
1248                 ib_send_cm_drep(cm_id, NULL, 0);
1249                 break;
1250         case IB_CM_REP_RECEIVED:
1251                 ipoib_dbg(priv, "REP received.\n");
1252                 ret = ipoib_cm_rep_handler(cm_id, event);
1253                 if (ret)
1254                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1255                                        NULL, 0, NULL, 0);
1256                 break;
1257         case IB_CM_REQ_ERROR:
1258         case IB_CM_REJ_RECEIVED:
1259         case IB_CM_TIMEWAIT_EXIT:
1260                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1261                 netif_tx_lock_bh(dev);
1262                 spin_lock_irqsave(&priv->lock, flags);
1263                 neigh = tx->neigh;
1264
1265                 if (neigh) {
1266                         neigh->cm = NULL;
1267                         ipoib_neigh_free(neigh);
1268
1269                         tx->neigh = NULL;
1270                 }
1271
1272                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1273                         list_move(&tx->list, &priv->cm.reap_list);
1274                         queue_work(priv->wq, &priv->cm.reap_task);
1275                 }
1276
1277                 spin_unlock_irqrestore(&priv->lock, flags);
1278                 netif_tx_unlock_bh(dev);
1279                 break;
1280         default:
1281                 break;
1282         }
1283
1284         return 0;
1285 }
1286
1287 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1288                                        struct ipoib_neigh *neigh)
1289 {
1290         struct ipoib_dev_priv *priv = netdev_priv(dev);
1291         struct ipoib_cm_tx *tx;
1292
1293         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1294         if (!tx)
1295                 return NULL;
1296
1297         neigh->cm = tx;
1298         tx->neigh = neigh;
1299         tx->path = path;
1300         tx->dev = dev;
1301         list_add(&tx->list, &priv->cm.start_list);
1302         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1303         queue_work(priv->wq, &priv->cm.start_task);
1304         return tx;
1305 }
1306
1307 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1308 {
1309         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1310         unsigned long flags;
1311         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1312                 spin_lock_irqsave(&priv->lock, flags);
1313                 list_move(&tx->list, &priv->cm.reap_list);
1314                 queue_work(priv->wq, &priv->cm.reap_task);
1315                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1316                           tx->neigh->daddr + 4);
1317                 tx->neigh = NULL;
1318                 spin_unlock_irqrestore(&priv->lock, flags);
1319         }
1320 }
1321
1322 #define QPN_AND_OPTIONS_OFFSET  4
1323
1324 static void ipoib_cm_tx_start(struct work_struct *work)
1325 {
1326         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1327                                                    cm.start_task);
1328         struct net_device *dev = priv->dev;
1329         struct ipoib_neigh *neigh;
1330         struct ipoib_cm_tx *p;
1331         unsigned long flags;
1332         struct ipoib_path *path;
1333         int ret;
1334
1335         struct ib_sa_path_rec pathrec;
1336         u32 qpn;
1337
1338         netif_tx_lock_bh(dev);
1339         spin_lock_irqsave(&priv->lock, flags);
1340
1341         while (!list_empty(&priv->cm.start_list)) {
1342                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1343                 list_del_init(&p->list);
1344                 neigh = p->neigh;
1345
1346                 qpn = IPOIB_QPN(neigh->daddr);
1347                 /*
1348                  * As long as the search is with these 2 locks,
1349                  * path existence indicates its validity.
1350                  */
1351                 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1352                 if (!path) {
1353                         pr_info("%s ignore not valid path %pI6\n",
1354                                 __func__,
1355                                 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1356                         goto free_neigh;
1357                 }
1358                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1359
1360                 spin_unlock_irqrestore(&priv->lock, flags);
1361                 netif_tx_unlock_bh(dev);
1362
1363                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1364
1365                 netif_tx_lock_bh(dev);
1366                 spin_lock_irqsave(&priv->lock, flags);
1367
1368                 if (ret) {
1369 free_neigh:
1370                         neigh = p->neigh;
1371                         if (neigh) {
1372                                 neigh->cm = NULL;
1373                                 ipoib_neigh_free(neigh);
1374                         }
1375                         list_del(&p->list);
1376                         kfree(p);
1377                 }
1378         }
1379
1380         spin_unlock_irqrestore(&priv->lock, flags);
1381         netif_tx_unlock_bh(dev);
1382 }
1383
1384 static void ipoib_cm_tx_reap(struct work_struct *work)
1385 {
1386         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1387                                                    cm.reap_task);
1388         struct net_device *dev = priv->dev;
1389         struct ipoib_cm_tx *p;
1390         unsigned long flags;
1391
1392         netif_tx_lock_bh(dev);
1393         spin_lock_irqsave(&priv->lock, flags);
1394
1395         while (!list_empty(&priv->cm.reap_list)) {
1396                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1397                 list_del(&p->list);
1398                 spin_unlock_irqrestore(&priv->lock, flags);
1399                 netif_tx_unlock_bh(dev);
1400                 ipoib_cm_tx_destroy(p);
1401                 netif_tx_lock_bh(dev);
1402                 spin_lock_irqsave(&priv->lock, flags);
1403         }
1404
1405         spin_unlock_irqrestore(&priv->lock, flags);
1406         netif_tx_unlock_bh(dev);
1407 }
1408
1409 static void ipoib_cm_skb_reap(struct work_struct *work)
1410 {
1411         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1412                                                    cm.skb_task);
1413         struct net_device *dev = priv->dev;
1414         struct sk_buff *skb;
1415         unsigned long flags;
1416         unsigned mtu = priv->mcast_mtu;
1417
1418         netif_tx_lock_bh(dev);
1419         spin_lock_irqsave(&priv->lock, flags);
1420
1421         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1422                 spin_unlock_irqrestore(&priv->lock, flags);
1423                 netif_tx_unlock_bh(dev);
1424
1425                 if (skb->protocol == htons(ETH_P_IP))
1426                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1427 #if IS_ENABLED(CONFIG_IPV6)
1428                 else if (skb->protocol == htons(ETH_P_IPV6))
1429                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1430 #endif
1431                 dev_kfree_skb_any(skb);
1432
1433                 netif_tx_lock_bh(dev);
1434                 spin_lock_irqsave(&priv->lock, flags);
1435         }
1436
1437         spin_unlock_irqrestore(&priv->lock, flags);
1438         netif_tx_unlock_bh(dev);
1439 }
1440
1441 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1442                            unsigned int mtu)
1443 {
1444         struct ipoib_dev_priv *priv = netdev_priv(dev);
1445         int e = skb_queue_empty(&priv->cm.skb_queue);
1446
1447         if (skb_dst(skb))
1448                 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1449
1450         skb_queue_tail(&priv->cm.skb_queue, skb);
1451         if (e)
1452                 queue_work(priv->wq, &priv->cm.skb_task);
1453 }
1454
1455 static void ipoib_cm_rx_reap(struct work_struct *work)
1456 {
1457         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1458                                                 cm.rx_reap_task)->dev);
1459 }
1460
1461 static void ipoib_cm_stale_task(struct work_struct *work)
1462 {
1463         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1464                                                    cm.stale_task.work);
1465         struct ipoib_cm_rx *p;
1466         int ret;
1467
1468         spin_lock_irq(&priv->lock);
1469         while (!list_empty(&priv->cm.passive_ids)) {
1470                 /* List is sorted by LRU, start from tail,
1471                  * stop when we see a recently used entry */
1472                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1473                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1474                         break;
1475                 list_move(&p->list, &priv->cm.rx_error_list);
1476                 p->state = IPOIB_CM_RX_ERROR;
1477                 spin_unlock_irq(&priv->lock);
1478                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1479                 if (ret)
1480                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1481                 spin_lock_irq(&priv->lock);
1482         }
1483
1484         if (!list_empty(&priv->cm.passive_ids))
1485                 queue_delayed_work(priv->wq,
1486                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1487         spin_unlock_irq(&priv->lock);
1488 }
1489
1490 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1491                          char *buf)
1492 {
1493         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1494
1495         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1496                 return sprintf(buf, "connected\n");
1497         else
1498                 return sprintf(buf, "datagram\n");
1499 }
1500
1501 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1502                         const char *buf, size_t count)
1503 {
1504         struct net_device *dev = to_net_dev(d);
1505         int ret;
1506         struct ipoib_dev_priv *priv = netdev_priv(dev);
1507
1508         if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1509                 return -EPERM;
1510
1511         if (!rtnl_trylock())
1512                 return restart_syscall();
1513
1514         ret = ipoib_set_mode(dev, buf);
1515
1516         rtnl_unlock();
1517
1518         if (!ret)
1519                 return count;
1520
1521         return ret;
1522 }
1523
1524 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1525
1526 int ipoib_cm_add_mode_attr(struct net_device *dev)
1527 {
1528         return device_create_file(&dev->dev, &dev_attr_mode);
1529 }
1530
1531 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1532 {
1533         struct ipoib_dev_priv *priv = netdev_priv(dev);
1534         struct ib_srq_init_attr srq_init_attr = {
1535                 .srq_type = IB_SRQT_BASIC,
1536                 .attr = {
1537                         .max_wr  = ipoib_recvq_size,
1538                         .max_sge = max_sge
1539                 }
1540         };
1541
1542         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1543         if (IS_ERR(priv->cm.srq)) {
1544                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1545                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1546                                priv->ca->name, PTR_ERR(priv->cm.srq));
1547                 priv->cm.srq = NULL;
1548                 return;
1549         }
1550
1551         priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1552         if (!priv->cm.srq_ring) {
1553                 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1554                        priv->ca->name, ipoib_recvq_size);
1555                 ib_destroy_srq(priv->cm.srq);
1556                 priv->cm.srq = NULL;
1557                 return;
1558         }
1559
1560 }
1561
1562 int ipoib_cm_dev_init(struct net_device *dev)
1563 {
1564         struct ipoib_dev_priv *priv = netdev_priv(dev);
1565         int max_srq_sge, i;
1566
1567         INIT_LIST_HEAD(&priv->cm.passive_ids);
1568         INIT_LIST_HEAD(&priv->cm.reap_list);
1569         INIT_LIST_HEAD(&priv->cm.start_list);
1570         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1571         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1572         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1573         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1574         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1575         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1576         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1577         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1578         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1579
1580         skb_queue_head_init(&priv->cm.skb_queue);
1581
1582         ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1583
1584         max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1585         ipoib_cm_create_srq(dev, max_srq_sge);
1586         if (ipoib_cm_has_srq(dev)) {
1587                 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1588                 priv->cm.num_frags  = max_srq_sge;
1589                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1590                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1591         } else {
1592                 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1593                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1594         }
1595
1596         ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1597
1598         if (ipoib_cm_has_srq(dev)) {
1599                 for (i = 0; i < ipoib_recvq_size; ++i) {
1600                         if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1601                                                    priv->cm.num_frags - 1,
1602                                                    priv->cm.srq_ring[i].mapping,
1603                                                    GFP_KERNEL)) {
1604                                 ipoib_warn(priv, "failed to allocate "
1605                                            "receive buffer %d\n", i);
1606                                 ipoib_cm_dev_cleanup(dev);
1607                                 return -ENOMEM;
1608                         }
1609
1610                         if (ipoib_cm_post_receive_srq(dev, i)) {
1611                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1612                                            "failed for buf %d\n", i);
1613                                 ipoib_cm_dev_cleanup(dev);
1614                                 return -EIO;
1615                         }
1616                 }
1617         }
1618
1619         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1620         return 0;
1621 }
1622
1623 void ipoib_cm_dev_cleanup(struct net_device *dev)
1624 {
1625         struct ipoib_dev_priv *priv = netdev_priv(dev);
1626         int ret;
1627
1628         if (!priv->cm.srq)
1629                 return;
1630
1631         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1632
1633         ret = ib_destroy_srq(priv->cm.srq);
1634         if (ret)
1635                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1636
1637         priv->cm.srq = NULL;
1638         if (!priv->cm.srq_ring)
1639                 return;
1640
1641         ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1642         priv->cm.srq_ring = NULL;
1643 }