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                 return -ENOMEM;
 362
 363         t = kmalloc(sizeof *t, GFP_KERNEL);
 364         if (!t) {
 365                 ret = -ENOMEM;
 366                 goto err_free_1;
 367         }
 368
 369         ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
 370
 371         spin_lock_irq(&priv->lock);
 372
 373         if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
 374                 spin_unlock_irq(&priv->lock);
 375                 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
 376                 ret = -EINVAL;
 377                 goto err_free;
 378         } else
 379                 ++priv->cm.nonsrq_conn_qp;
 380
 381         spin_unlock_irq(&priv->lock);
 382
 383         for (i = 0; i < ipoib_recvq_size; ++i) {
 384                 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
 385                                            rx->rx_ring[i].mapping,
 386                                            GFP_KERNEL)) {
 387                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 388                         ret = -ENOMEM;
 389                         goto err_count;
 390                 }
 391                 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
 392                 if (ret) {
 393                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
 394                                    "failed for buf %d\n", i);
 395                         ret = -EIO;
 396                         goto err_count;
 397                 }
 398         }
 399
 400         rx->recv_count = ipoib_recvq_size;
 401
 402         kfree(t);
 403
 404         return 0;
 405
 406 err_count:
 407         spin_lock_irq(&priv->lock);
 408         --priv->cm.nonsrq_conn_qp;
 409         spin_unlock_irq(&priv->lock);
 410
 411 err_free:
 412         kfree(t);
 413
 414 err_free_1:
 415         ipoib_cm_free_rx_ring(dev, rx->rx_ring);
 416
 417         return ret;
 418 }
 419
 420 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 421                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 422                              unsigned psn)
 423 {
 424         struct ipoib_dev_priv *priv = netdev_priv(dev);
 425         struct ipoib_cm_data data = {};
 426         struct ib_cm_rep_param rep = {};
 427
 428         data.qpn = cpu_to_be32(priv->qp->qp_num);
 429         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 430
 431         rep.private_data = &data;
 432         rep.private_data_len = sizeof data;
 433         rep.flow_control = 0;
 434         rep.rnr_retry_count = req->rnr_retry_count;
 435         rep.srq = ipoib_cm_has_srq(dev);
 436         rep.qp_num = qp->qp_num;
 437         rep.starting_psn = psn;
 438         return ib_send_cm_rep(cm_id, &rep);
 439 }
 440
 441 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 442 {
 443         struct net_device *dev = cm_id->context;
 444         struct ipoib_dev_priv *priv = netdev_priv(dev);
 445         struct ipoib_cm_rx *p;
 446         unsigned psn;
 447         int ret;
 448
 449         ipoib_dbg(priv, "REQ arrived\n");
 450         p = kzalloc(sizeof *p, GFP_KERNEL);
 451         if (!p)
 452                 return -ENOMEM;
 453         p->dev = dev;
 454         p->id = cm_id;
 455         cm_id->context = p;
 456         p->state = IPOIB_CM_RX_LIVE;
 457         p->jiffies = jiffies;
 458         INIT_LIST_HEAD(&p->list);
 459
 460         p->qp = ipoib_cm_create_rx_qp(dev, p);
 461         if (IS_ERR(p->qp)) {
 462                 ret = PTR_ERR(p->qp);
 463                 goto err_qp;
 464         }
 465
 466         psn = prandom_u32() & 0xffffff;
 467         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 468         if (ret)
 469                 goto err_modify;
 470
 471         if (!ipoib_cm_has_srq(dev)) {
 472                 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
 473                 if (ret)
 474                         goto err_modify;
 475         }
 476
 477         spin_lock_irq(&priv->lock);
 478         queue_delayed_work(priv->wq,
 479                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 480         /* Add this entry to passive ids list head, but do not re-add it
 481          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 482         p->jiffies = jiffies;
 483         if (p->state == IPOIB_CM_RX_LIVE)
 484                 list_move(&p->list, &priv->cm.passive_ids);
 485         spin_unlock_irq(&priv->lock);
 486
 487         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 488         if (ret) {
 489                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 490                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 491                         ipoib_warn(priv, "unable to move qp to error state\n");
 492         }
 493         return 0;
 494
 495 err_modify:
 496         ib_destroy_qp(p->qp);
 497 err_qp:
 498         kfree(p);
 499         return ret;
 500 }
 501
 502 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 503                                struct ib_cm_event *event)
 504 {
 505         struct ipoib_cm_rx *p;
 506         struct ipoib_dev_priv *priv;
 507
 508         switch (event->event) {
 509         case IB_CM_REQ_RECEIVED:
 510                 return ipoib_cm_req_handler(cm_id, event);
 511         case IB_CM_DREQ_RECEIVED:
 512                 p = cm_id->context;
 513                 ib_send_cm_drep(cm_id, NULL, 0);
 514                 /* Fall through */
 515         case IB_CM_REJ_RECEIVED:
 516                 p = cm_id->context;
 517                 priv = netdev_priv(p->dev);
 518                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 519                         ipoib_warn(priv, "unable to move qp to error state\n");
 520                 /* Fall through */
 521         default:
 522                 return 0;
 523         }
 524 }
 525 /* Adjust length of skb with fragments to match received data */
 526 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 527                           unsigned int length, struct sk_buff *toskb)
 528 {
 529         int i, num_frags;
 530         unsigned int size;
 531
 532         /* put header into skb */
 533         size = min(length, hdr_space);
 534         skb->tail += size;
 535         skb->len += size;
 536         length -= size;
 537
 538         num_frags = skb_shinfo(skb)->nr_frags;
 539         for (i = 0; i < num_frags; i++) {
 540                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 541
 542                 if (length == 0) {
 543                         /* don't need this page */
 544                         skb_fill_page_desc(toskb, i, skb_frag_page(frag),
 545                                            0, PAGE_SIZE);
 546                         --skb_shinfo(skb)->nr_frags;
 547                 } else {
 548                         size = min(length, (unsigned) PAGE_SIZE);
 549
 550                         skb_frag_size_set(frag, size);
 551                         skb->data_len += size;
 552                         skb->truesize += size;
 553                         skb->len += size;
 554                         length -= size;
 555                 }
 556         }
 557 }
 558
 559 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 560 {
 561         struct ipoib_dev_priv *priv = netdev_priv(dev);
 562         struct ipoib_cm_rx_buf *rx_ring;
 563         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
 564         struct sk_buff *skb, *newskb;
 565         struct ipoib_cm_rx *p;
 566         unsigned long flags;
 567         u64 mapping[IPOIB_CM_RX_SG];
 568         int frags;
 569         int has_srq;
 570         struct sk_buff *small_skb;
 571
 572         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 573                        wr_id, wc->status);
 574
 575         if (unlikely(wr_id >= ipoib_recvq_size)) {
 576                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
 577                         spin_lock_irqsave(&priv->lock, flags);
 578                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 579                         ipoib_cm_start_rx_drain(priv);
 580                         queue_work(priv->wq, &priv->cm.rx_reap_task);
 581                         spin_unlock_irqrestore(&priv->lock, flags);
 582                 } else
 583                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 584                                    wr_id, ipoib_recvq_size);
 585                 return;
 586         }
 587
 588         p = wc->qp->qp_context;
 589
 590         has_srq = ipoib_cm_has_srq(dev);
 591         rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
 592
 593         skb = rx_ring[wr_id].skb;
 594
 595         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 596                 ipoib_dbg(priv, "cm recv error "
 597                            "(status=%d, wrid=%d vend_err %x)\n",
 598                            wc->status, wr_id, wc->vendor_err);
 599                 ++dev->stats.rx_dropped;
 600                 if (has_srq)
 601                         goto repost;
 602                 else {
 603                         if (!--p->recv_count) {
 604                                 spin_lock_irqsave(&priv->lock, flags);
 605                                 list_move(&p->list, &priv->cm.rx_reap_list);
 606                                 spin_unlock_irqrestore(&priv->lock, flags);
 607                                 queue_work(priv->wq, &priv->cm.rx_reap_task);
 608                         }
 609                         return;
 610                 }
 611         }
 612
 613         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
 614                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 615                         spin_lock_irqsave(&priv->lock, flags);
 616                         p->jiffies = jiffies;
 617                         /* Move this entry to list head, but do not re-add it
 618                          * if it has been moved out of list. */
 619                         if (p->state == IPOIB_CM_RX_LIVE)
 620                                 list_move(&p->list, &priv->cm.passive_ids);
 621                         spin_unlock_irqrestore(&priv->lock, flags);
 622                 }
 623         }
 624
 625         if (wc->byte_len < IPOIB_CM_COPYBREAK) {
 626                 int dlen = wc->byte_len;
 627
 628                 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE);
 629                 if (small_skb) {
 630                         skb_reserve(small_skb, IPOIB_CM_RX_RESERVE);
 631                         ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
 632                                                    dlen, DMA_FROM_DEVICE);
 633                         skb_copy_from_linear_data(skb, small_skb->data, dlen);
 634                         ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
 635                                                       dlen, DMA_FROM_DEVICE);
 636                         skb_put(small_skb, dlen);
 637                         skb = small_skb;
 638                         goto copied;
 639                 }
 640         }
 641
 642         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
 643                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
 644
 645         newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
 646                                        mapping, GFP_ATOMIC);
 647         if (unlikely(!newskb)) {
 648                 /*
 649                  * If we can't allocate a new RX buffer, dump
 650                  * this packet and reuse the old buffer.
 651                  */
 652                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 653                 ++dev->stats.rx_dropped;
 654                 goto repost;
 655         }
 656
 657         ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
 658         memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
 659
 660         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 661                        wc->byte_len, wc->slid);
 662
 663         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 664
 665 copied:
 666         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 667         skb_add_pseudo_hdr(skb);
 668
 669         ++dev->stats.rx_packets;
 670         dev->stats.rx_bytes += skb->len;
 671
 672         skb->dev = dev;
 673         /* XXX get correct PACKET_ type here */
 674         skb->pkt_type = PACKET_HOST;
 675         netif_receive_skb(skb);
 676
 677 repost:
 678         if (has_srq) {
 679                 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
 680                         ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
 681                                    "for buf %d\n", wr_id);
 682         } else {
 683                 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
 684                                                           &priv->cm.rx_wr,
 685                                                           priv->cm.rx_sge,
 686                                                           wr_id))) {
 687                         --p->recv_count;
 688                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
 689                                    "for buf %d\n", wr_id);
 690                 }
 691         }
 692 }
 693
 694 static inline int post_send(struct ipoib_dev_priv *priv,
 695                             struct ipoib_cm_tx *tx,
 696                             unsigned int wr_id,
 697                             struct ipoib_tx_buf *tx_req)
 698 {
 699         struct ib_send_wr *bad_wr;
 700
 701         ipoib_build_sge(priv, tx_req);
 702
 703         priv->tx_wr.wr.wr_id    = wr_id | IPOIB_OP_CM;
 704
 705         return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
 706 }
 707
 708 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 709 {
 710         struct ipoib_dev_priv *priv = netdev_priv(dev);
 711         struct ipoib_tx_buf *tx_req;
 712         int rc;
 713         unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
 714
 715         if (unlikely(skb->len > tx->mtu)) {
 716                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 717                            skb->len, tx->mtu);
 718                 ++dev->stats.tx_dropped;
 719                 ++dev->stats.tx_errors;
 720                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 721                 return;
 722         }
 723         if (skb_shinfo(skb)->nr_frags > usable_sge) {
 724                 if (skb_linearize(skb) < 0) {
 725                         ipoib_warn(priv, "skb could not be linearized\n");
 726                         ++dev->stats.tx_dropped;
 727                         ++dev->stats.tx_errors;
 728                         dev_kfree_skb_any(skb);
 729                         return;
 730                 }
 731                 /* Does skb_linearize return ok without reducing nr_frags? */
 732                 if (skb_shinfo(skb)->nr_frags > usable_sge) {
 733                         ipoib_warn(priv, "too many frags after skb linearize\n");
 734                         ++dev->stats.tx_dropped;
 735                         ++dev->stats.tx_errors;
 736                         dev_kfree_skb_any(skb);
 737                         return;
 738                 }
 739         }
 740         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 741                        tx->tx_head, skb->len, tx->qp->qp_num);
 742
 743         /*
 744          * We put the skb into the tx_ring _before_ we call post_send()
 745          * because it's entirely possible that the completion handler will
 746          * run before we execute anything after the post_send().  That
 747          * means we have to make sure everything is properly recorded and
 748          * our state is consistent before we call post_send().
 749          */
 750         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 751         tx_req->skb = skb;
 752
 753         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 754                 ++dev->stats.tx_errors;
 755                 dev_kfree_skb_any(skb);
 756                 return;
 757         }
 758
 759         skb_orphan(skb);
 760         skb_dst_drop(skb);
 761
 762         rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
 763         if (unlikely(rc)) {
 764                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 765                 ++dev->stats.tx_errors;
 766                 ipoib_dma_unmap_tx(priv, tx_req);
 767                 dev_kfree_skb_any(skb);
 768         } else {
 769                 netif_trans_update(dev);
 770                 ++tx->tx_head;
 771
 772                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 773                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 774                                   tx->qp->qp_num);
 775                         netif_stop_queue(dev);
 776                         rc = ib_req_notify_cq(priv->send_cq,
 777                                 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
 778                         if (rc < 0)
 779                                 ipoib_warn(priv, "request notify on send CQ failed\n");
 780                         else if (rc)
 781                                 ipoib_send_comp_handler(priv->send_cq, dev);
 782                 }
 783         }
 784 }
 785
 786 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 787 {
 788         struct ipoib_dev_priv *priv = netdev_priv(dev);
 789         struct ipoib_cm_tx *tx = wc->qp->qp_context;
 790         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 791         struct ipoib_tx_buf *tx_req;
 792         unsigned long flags;
 793
 794         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 795                        wr_id, wc->status);
 796
 797         if (unlikely(wr_id >= ipoib_sendq_size)) {
 798                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 799                            wr_id, ipoib_sendq_size);
 800                 return;
 801         }
 802
 803         tx_req = &tx->tx_ring[wr_id];
 804
 805         ipoib_dma_unmap_tx(priv, tx_req);
 806
 807         /* FIXME: is this right? Shouldn't we only increment on success? */
 808         ++dev->stats.tx_packets;
 809         dev->stats.tx_bytes += tx_req->skb->len;
 810
 811         dev_kfree_skb_any(tx_req->skb);
 812
 813         netif_tx_lock(dev);
 814
 815         ++tx->tx_tail;
 816         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 817             netif_queue_stopped(dev) &&
 818             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 819                 netif_wake_queue(dev);
 820
 821         if (wc->status != IB_WC_SUCCESS &&
 822             wc->status != IB_WC_WR_FLUSH_ERR) {
 823                 struct ipoib_neigh *neigh;
 824
 825                 if (wc->status != IB_WC_RNR_RETRY_EXC_ERR)
 826                         ipoib_warn(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
 827                                    wc->status, wr_id, wc->vendor_err);
 828                 else
 829                         ipoib_dbg(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
 830                                   wc->status, wr_id, wc->vendor_err);
 831
 832                 spin_lock_irqsave(&priv->lock, flags);
 833                 neigh = tx->neigh;
 834
 835                 if (neigh) {
 836                         neigh->cm = NULL;
 837                         ipoib_neigh_free(neigh);
 838
 839                         tx->neigh = NULL;
 840                 }
 841
 842                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 843                         list_move(&tx->list, &priv->cm.reap_list);
 844                         queue_work(priv->wq, &priv->cm.reap_task);
 845                 }
 846
 847                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 848
 849                 spin_unlock_irqrestore(&priv->lock, flags);
 850         }
 851
 852         netif_tx_unlock(dev);
 853 }
 854
 855 int ipoib_cm_dev_open(struct net_device *dev)
 856 {
 857         struct ipoib_dev_priv *priv = netdev_priv(dev);
 858         int ret;
 859
 860         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 861                 return 0;
 862
 863         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 864         if (IS_ERR(priv->cm.id)) {
 865                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 866                 ret = PTR_ERR(priv->cm.id);
 867                 goto err_cm;
 868         }
 869
 870         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 871                            0);
 872         if (ret) {
 873                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 874                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 875                 goto err_listen;
 876         }
 877
 878         return 0;
 879
 880 err_listen:
 881         ib_destroy_cm_id(priv->cm.id);
 882 err_cm:
 883         priv->cm.id = NULL;
 884         return ret;
 885 }
 886
 887 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
 888 {
 889         struct ipoib_dev_priv *priv = netdev_priv(dev);
 890         struct ipoib_cm_rx *rx, *n;
 891         LIST_HEAD(list);
 892
 893         spin_lock_irq(&priv->lock);
 894         list_splice_init(&priv->cm.rx_reap_list, &list);
 895         spin_unlock_irq(&priv->lock);
 896
 897         list_for_each_entry_safe(rx, n, &list, list) {
 898                 ib_destroy_cm_id(rx->id);
 899                 ib_destroy_qp(rx->qp);
 900                 if (!ipoib_cm_has_srq(dev)) {
 901                         ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
 902                         spin_lock_irq(&priv->lock);
 903                         --priv->cm.nonsrq_conn_qp;
 904                         spin_unlock_irq(&priv->lock);
 905                 }
 906                 kfree(rx);
 907         }
 908 }
 909
 910 void ipoib_cm_dev_stop(struct net_device *dev)
 911 {
 912         struct ipoib_dev_priv *priv = netdev_priv(dev);
 913         struct ipoib_cm_rx *p;
 914         unsigned long begin;
 915         int ret;
 916
 917         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 918                 return;
 919
 920         ib_destroy_cm_id(priv->cm.id);
 921         priv->cm.id = NULL;
 922
 923         spin_lock_irq(&priv->lock);
 924         while (!list_empty(&priv->cm.passive_ids)) {
 925                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 926                 list_move(&p->list, &priv->cm.rx_error_list);
 927                 p->state = IPOIB_CM_RX_ERROR;
 928                 spin_unlock_irq(&priv->lock);
 929                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 930                 if (ret)
 931                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 932                 spin_lock_irq(&priv->lock);
 933         }
 934
 935         /* Wait for all RX to be drained */
 936         begin = jiffies;
 937
 938         while (!list_empty(&priv->cm.rx_error_list) ||
 939                !list_empty(&priv->cm.rx_flush_list) ||
 940                !list_empty(&priv->cm.rx_drain_list)) {
 941                 if (time_after(jiffies, begin + 5 * HZ)) {
 942                         ipoib_warn(priv, "RX drain timing out\n");
 943
 944                         /*
 945                          * assume the HW is wedged and just free up everything.
 946                          */
 947                         list_splice_init(&priv->cm.rx_flush_list,
 948                                          &priv->cm.rx_reap_list);
 949                         list_splice_init(&priv->cm.rx_error_list,
 950                                          &priv->cm.rx_reap_list);
 951                         list_splice_init(&priv->cm.rx_drain_list,
 952                                          &priv->cm.rx_reap_list);
 953                         break;
 954                 }
 955                 spin_unlock_irq(&priv->lock);
 956                 msleep(1);
 957                 ipoib_drain_cq(dev);
 958                 spin_lock_irq(&priv->lock);
 959         }
 960
 961         spin_unlock_irq(&priv->lock);
 962
 963         ipoib_cm_free_rx_reap_list(dev);
 964
 965         cancel_delayed_work(&priv->cm.stale_task);
 966 }
 967
 968 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 969 {
 970         struct ipoib_cm_tx *p = cm_id->context;
 971         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 972         struct ipoib_cm_data *data = event->private_data;
 973         struct sk_buff_head skqueue;
 974         struct ib_qp_attr qp_attr;
 975         int qp_attr_mask, ret;
 976         struct sk_buff *skb;
 977
 978         p->mtu = be32_to_cpu(data->mtu);
 979
 980         if (p->mtu <= IPOIB_ENCAP_LEN) {
 981                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 982                            p->mtu, IPOIB_ENCAP_LEN);
 983                 return -EINVAL;
 984         }
 985
 986         qp_attr.qp_state = IB_QPS_RTR;
 987         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 988         if (ret) {
 989                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 990                 return ret;
 991         }
 992
 993         qp_attr.rq_psn = 0 /* FIXME */;
 994         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 995         if (ret) {
 996                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 997                 return ret;
 998         }
 999
1000         qp_attr.qp_state = IB_QPS_RTS;
1001         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1002         if (ret) {
1003                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1004                 return ret;
1005         }
1006         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1007         if (ret) {
1008                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1009                 return ret;
1010         }
1011
1012         skb_queue_head_init(&skqueue);
1013
1014         spin_lock_irq(&priv->lock);
1015         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1016         if (p->neigh)
1017                 while ((skb = __skb_dequeue(&p->neigh->queue)))
1018                         __skb_queue_tail(&skqueue, skb);
1019         spin_unlock_irq(&priv->lock);
1020
1021         while ((skb = __skb_dequeue(&skqueue))) {
1022                 skb->dev = p->dev;
1023                 ret = dev_queue_xmit(skb);
1024                 if (ret)
1025                         ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1026                                    __func__, ret);
1027         }
1028
1029         ret = ib_send_cm_rtu(cm_id, NULL, 0);
1030         if (ret) {
1031                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1032                 return ret;
1033         }
1034         return 0;
1035 }
1036
1037 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1038 {
1039         struct ipoib_dev_priv *priv = netdev_priv(dev);
1040         struct ib_qp_init_attr attr = {
1041                 .send_cq                = priv->recv_cq,
1042                 .recv_cq                = priv->recv_cq,
1043                 .srq                    = priv->cm.srq,
1044                 .cap.max_send_wr        = ipoib_sendq_size,
1045                 .cap.max_send_sge       = 1,
1046                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
1047                 .qp_type                = IB_QPT_RC,
1048                 .qp_context             = tx,
1049                 .create_flags           = IB_QP_CREATE_USE_GFP_NOIO
1050         };
1051
1052         struct ib_qp *tx_qp;
1053
1054         if (dev->features & NETIF_F_SG)
1055                 attr.cap.max_send_sge =
1056                         min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1057
1058         tx_qp = ib_create_qp(priv->pd, &attr);
1059         if (PTR_ERR(tx_qp) == -EINVAL) {
1060                 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
1061                 tx_qp = ib_create_qp(priv->pd, &attr);
1062         }
1063         tx->max_send_sge = attr.cap.max_send_sge;
1064         return tx_qp;
1065 }
1066
1067 static int ipoib_cm_send_req(struct net_device *dev,
1068                              struct ib_cm_id *id, struct ib_qp *qp,
1069                              u32 qpn,
1070                              struct ib_sa_path_rec *pathrec)
1071 {
1072         struct ipoib_dev_priv *priv = netdev_priv(dev);
1073         struct ipoib_cm_data data = {};
1074         struct ib_cm_req_param req = {};
1075
1076         data.qpn = cpu_to_be32(priv->qp->qp_num);
1077         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1078
1079         req.primary_path                = pathrec;
1080         req.alternate_path              = NULL;
1081         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1082         req.qp_num                      = qp->qp_num;
1083         req.qp_type                     = qp->qp_type;
1084         req.private_data                = &data;
1085         req.private_data_len            = sizeof data;
1086         req.flow_control                = 0;
1087
1088         req.starting_psn                = 0; /* FIXME */
1089
1090         /*
1091          * Pick some arbitrary defaults here; we could make these
1092          * module parameters if anyone cared about setting them.
1093          */
1094         req.responder_resources         = 4;
1095         req.remote_cm_response_timeout  = 20;
1096         req.local_cm_response_timeout   = 20;
1097         req.retry_count                 = 0; /* RFC draft warns against retries */
1098         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
1099         req.max_cm_retries              = 15;
1100         req.srq                         = ipoib_cm_has_srq(dev);
1101         return ib_send_cm_req(id, &req);
1102 }
1103
1104 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1105                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
1106 {
1107         struct ipoib_dev_priv *priv = netdev_priv(dev);
1108         struct ib_qp_attr qp_attr;
1109         int qp_attr_mask, ret;
1110         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1111         if (ret) {
1112                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1113                 return ret;
1114         }
1115
1116         qp_attr.qp_state = IB_QPS_INIT;
1117         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1118         qp_attr.port_num = priv->port;
1119         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1120
1121         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1122         if (ret) {
1123                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1124                 return ret;
1125         }
1126         return 0;
1127 }
1128
1129 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1130                             struct ib_sa_path_rec *pathrec)
1131 {
1132         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1133         int ret;
1134
1135         p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
1136                                GFP_NOIO, PAGE_KERNEL);
1137         if (!p->tx_ring) {
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_send;
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_modify_send;
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_modify_send:
1175         ib_destroy_cm_id(p->id);
1176 err_id:
1177         p->id = NULL;
1178         ib_destroy_qp(p->qp);
1179 err_qp:
1180         p->qp = NULL;
1181         vfree(p->tx_ring);
1182 err_tx:
1183         return ret;
1184 }
1185
1186 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1187 {
1188         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1189         struct ipoib_tx_buf *tx_req;
1190         unsigned long begin;
1191
1192         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1193                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1194
1195         if (p->id)
1196                 ib_destroy_cm_id(p->id);
1197
1198         if (p->tx_ring) {
1199                 /* Wait for all sends to complete */
1200                 begin = jiffies;
1201                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1202                         if (time_after(jiffies, begin + 5 * HZ)) {
1203                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1204                                            p->tx_head - p->tx_tail);
1205                                 goto timeout;
1206                         }
1207
1208                         msleep(1);
1209                 }
1210         }
1211
1212 timeout:
1213
1214         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1215                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1216                 ipoib_dma_unmap_tx(priv, tx_req);
1217                 dev_kfree_skb_any(tx_req->skb);
1218                 ++p->tx_tail;
1219                 netif_tx_lock_bh(p->dev);
1220                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1221                     netif_queue_stopped(p->dev) &&
1222                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1223                         netif_wake_queue(p->dev);
1224                 netif_tx_unlock_bh(p->dev);
1225         }
1226
1227         if (p->qp)
1228                 ib_destroy_qp(p->qp);
1229
1230         vfree(p->tx_ring);
1231         kfree(p);
1232 }
1233
1234 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1235                                struct ib_cm_event *event)
1236 {
1237         struct ipoib_cm_tx *tx = cm_id->context;
1238         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1239         struct net_device *dev = priv->dev;
1240         struct ipoib_neigh *neigh;
1241         unsigned long flags;
1242         int ret;
1243
1244         switch (event->event) {
1245         case IB_CM_DREQ_RECEIVED:
1246                 ipoib_dbg(priv, "DREQ received.\n");
1247                 ib_send_cm_drep(cm_id, NULL, 0);
1248                 break;
1249         case IB_CM_REP_RECEIVED:
1250                 ipoib_dbg(priv, "REP received.\n");
1251                 ret = ipoib_cm_rep_handler(cm_id, event);
1252                 if (ret)
1253                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1254                                        NULL, 0, NULL, 0);
1255                 break;
1256         case IB_CM_REQ_ERROR:
1257         case IB_CM_REJ_RECEIVED:
1258         case IB_CM_TIMEWAIT_EXIT:
1259                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1260                 netif_tx_lock_bh(dev);
1261                 spin_lock_irqsave(&priv->lock, flags);
1262                 neigh = tx->neigh;
1263
1264                 if (neigh) {
1265                         neigh->cm = NULL;
1266                         ipoib_neigh_free(neigh);
1267
1268                         tx->neigh = NULL;
1269                 }
1270
1271                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1272                         list_move(&tx->list, &priv->cm.reap_list);
1273                         queue_work(priv->wq, &priv->cm.reap_task);
1274                 }
1275
1276                 spin_unlock_irqrestore(&priv->lock, flags);
1277                 netif_tx_unlock_bh(dev);
1278                 break;
1279         default:
1280                 break;
1281         }
1282
1283         return 0;
1284 }
1285
1286 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1287                                        struct ipoib_neigh *neigh)
1288 {
1289         struct ipoib_dev_priv *priv = netdev_priv(dev);
1290         struct ipoib_cm_tx *tx;
1291
1292         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1293         if (!tx)
1294                 return NULL;
1295
1296         neigh->cm = tx;
1297         tx->neigh = neigh;
1298         tx->path = path;
1299         tx->dev = dev;
1300         list_add(&tx->list, &priv->cm.start_list);
1301         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1302         queue_work(priv->wq, &priv->cm.start_task);
1303         return tx;
1304 }
1305
1306 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1307 {
1308         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1309         unsigned long flags;
1310         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1311                 spin_lock_irqsave(&priv->lock, flags);
1312                 list_move(&tx->list, &priv->cm.reap_list);
1313                 queue_work(priv->wq, &priv->cm.reap_task);
1314                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1315                           tx->neigh->daddr + 4);
1316                 tx->neigh = NULL;
1317                 spin_unlock_irqrestore(&priv->lock, flags);
1318         }
1319 }
1320
1321 #define QPN_AND_OPTIONS_OFFSET  4
1322
1323 static void ipoib_cm_tx_start(struct work_struct *work)
1324 {
1325         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1326                                                    cm.start_task);
1327         struct net_device *dev = priv->dev;
1328         struct ipoib_neigh *neigh;
1329         struct ipoib_cm_tx *p;
1330         unsigned long flags;
1331         struct ipoib_path *path;
1332         int ret;
1333
1334         struct ib_sa_path_rec pathrec;
1335         u32 qpn;
1336
1337         netif_tx_lock_bh(dev);
1338         spin_lock_irqsave(&priv->lock, flags);
1339
1340         while (!list_empty(&priv->cm.start_list)) {
1341                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1342                 list_del_init(&p->list);
1343                 neigh = p->neigh;
1344
1345                 qpn = IPOIB_QPN(neigh->daddr);
1346                 /*
1347                  * As long as the search is with these 2 locks,
1348                  * path existence indicates its validity.
1349                  */
1350                 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1351                 if (!path) {
1352                         pr_info("%s ignore not valid path %pI6\n",
1353                                 __func__,
1354                                 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1355                         goto free_neigh;
1356                 }
1357                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1358
1359                 spin_unlock_irqrestore(&priv->lock, flags);
1360                 netif_tx_unlock_bh(dev);
1361
1362                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1363
1364                 netif_tx_lock_bh(dev);
1365                 spin_lock_irqsave(&priv->lock, flags);
1366
1367                 if (ret) {
1368 free_neigh:
1369                         neigh = p->neigh;
1370                         if (neigh) {
1371                                 neigh->cm = NULL;
1372                                 ipoib_neigh_free(neigh);
1373                         }
1374                         list_del(&p->list);
1375                         kfree(p);
1376                 }
1377         }
1378
1379         spin_unlock_irqrestore(&priv->lock, flags);
1380         netif_tx_unlock_bh(dev);
1381 }
1382
1383 static void ipoib_cm_tx_reap(struct work_struct *work)
1384 {
1385         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1386                                                    cm.reap_task);
1387         struct net_device *dev = priv->dev;
1388         struct ipoib_cm_tx *p;
1389         unsigned long flags;
1390
1391         netif_tx_lock_bh(dev);
1392         spin_lock_irqsave(&priv->lock, flags);
1393
1394         while (!list_empty(&priv->cm.reap_list)) {
1395                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1396                 list_del_init(&p->list);
1397                 spin_unlock_irqrestore(&priv->lock, flags);
1398                 netif_tx_unlock_bh(dev);
1399                 ipoib_cm_tx_destroy(p);
1400                 netif_tx_lock_bh(dev);
1401                 spin_lock_irqsave(&priv->lock, flags);
1402         }
1403
1404         spin_unlock_irqrestore(&priv->lock, flags);
1405         netif_tx_unlock_bh(dev);
1406 }
1407
1408 static void ipoib_cm_skb_reap(struct work_struct *work)
1409 {
1410         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1411                                                    cm.skb_task);
1412         struct net_device *dev = priv->dev;
1413         struct sk_buff *skb;
1414         unsigned long flags;
1415         unsigned mtu = priv->mcast_mtu;
1416
1417         netif_tx_lock_bh(dev);
1418         spin_lock_irqsave(&priv->lock, flags);
1419
1420         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1421                 spin_unlock_irqrestore(&priv->lock, flags);
1422                 netif_tx_unlock_bh(dev);
1423
1424                 if (skb->protocol == htons(ETH_P_IP))
1425                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1426 #if IS_ENABLED(CONFIG_IPV6)
1427                 else if (skb->protocol == htons(ETH_P_IPV6))
1428                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1429 #endif
1430                 dev_kfree_skb_any(skb);
1431
1432                 netif_tx_lock_bh(dev);
1433                 spin_lock_irqsave(&priv->lock, flags);
1434         }
1435
1436         spin_unlock_irqrestore(&priv->lock, flags);
1437         netif_tx_unlock_bh(dev);
1438 }
1439
1440 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1441                            unsigned int mtu)
1442 {
1443         struct ipoib_dev_priv *priv = netdev_priv(dev);
1444         int e = skb_queue_empty(&priv->cm.skb_queue);
1445
1446         if (skb_dst(skb))
1447                 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1448
1449         skb_queue_tail(&priv->cm.skb_queue, skb);
1450         if (e)
1451                 queue_work(priv->wq, &priv->cm.skb_task);
1452 }
1453
1454 static void ipoib_cm_rx_reap(struct work_struct *work)
1455 {
1456         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1457                                                 cm.rx_reap_task)->dev);
1458 }
1459
1460 static void ipoib_cm_stale_task(struct work_struct *work)
1461 {
1462         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1463                                                    cm.stale_task.work);
1464         struct ipoib_cm_rx *p;
1465         int ret;
1466
1467         spin_lock_irq(&priv->lock);
1468         while (!list_empty(&priv->cm.passive_ids)) {
1469                 /* List is sorted by LRU, start from tail,
1470                  * stop when we see a recently used entry */
1471                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1472                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1473                         break;
1474                 list_move(&p->list, &priv->cm.rx_error_list);
1475                 p->state = IPOIB_CM_RX_ERROR;
1476                 spin_unlock_irq(&priv->lock);
1477                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1478                 if (ret)
1479                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1480                 spin_lock_irq(&priv->lock);
1481         }
1482
1483         if (!list_empty(&priv->cm.passive_ids))
1484                 queue_delayed_work(priv->wq,
1485                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1486         spin_unlock_irq(&priv->lock);
1487 }
1488
1489 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1490                          char *buf)
1491 {
1492         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1493
1494         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1495                 return sprintf(buf, "connected\n");
1496         else
1497                 return sprintf(buf, "datagram\n");
1498 }
1499
1500 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1501                         const char *buf, size_t count)
1502 {
1503         struct net_device *dev = to_net_dev(d);
1504         int ret;
1505         struct ipoib_dev_priv *priv = netdev_priv(dev);
1506
1507         if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1508                 return -EPERM;
1509
1510         if (!rtnl_trylock())
1511                 return restart_syscall();
1512
1513         ret = ipoib_set_mode(dev, buf);
1514
1515         /* The assumption is that the function ipoib_set_mode returned
1516          * with the rtnl held by it, if not the value -EBUSY returned,
1517          * then no need to rtnl_unlock
1518          */
1519         if (ret != -EBUSY)
1520                 rtnl_unlock();
1521
1522         return (!ret || ret == -EBUSY) ? count : ret;
1523 }
1524
1525 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1526
1527 int ipoib_cm_add_mode_attr(struct net_device *dev)
1528 {
1529         return device_create_file(&dev->dev, &dev_attr_mode);
1530 }
1531
1532 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1533 {
1534         struct ipoib_dev_priv *priv = netdev_priv(dev);
1535         struct ib_srq_init_attr srq_init_attr = {
1536                 .srq_type = IB_SRQT_BASIC,
1537                 .attr = {
1538                         .max_wr  = ipoib_recvq_size,
1539                         .max_sge = max_sge
1540                 }
1541         };
1542
1543         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1544         if (IS_ERR(priv->cm.srq)) {
1545                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1546                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1547                                priv->ca->name, PTR_ERR(priv->cm.srq));
1548                 priv->cm.srq = NULL;
1549                 return;
1550         }
1551
1552         priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1553         if (!priv->cm.srq_ring) {
1554                 ib_destroy_srq(priv->cm.srq);
1555                 priv->cm.srq = NULL;
1556                 return;
1557         }
1558
1559 }
1560
1561 int ipoib_cm_dev_init(struct net_device *dev)
1562 {
1563         struct ipoib_dev_priv *priv = netdev_priv(dev);
1564         int max_srq_sge, i;
1565
1566         INIT_LIST_HEAD(&priv->cm.passive_ids);
1567         INIT_LIST_HEAD(&priv->cm.reap_list);
1568         INIT_LIST_HEAD(&priv->cm.start_list);
1569         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1570         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1571         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1572         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1573         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1574         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1575         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1576         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1577         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1578
1579         skb_queue_head_init(&priv->cm.skb_queue);
1580
1581         ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1582
1583         max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1584         ipoib_cm_create_srq(dev, max_srq_sge);
1585         if (ipoib_cm_has_srq(dev)) {
1586                 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1587                 priv->cm.num_frags  = max_srq_sge;
1588                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1589                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1590         } else {
1591                 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1592                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1593         }
1594
1595         ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1596
1597         if (ipoib_cm_has_srq(dev)) {
1598                 for (i = 0; i < ipoib_recvq_size; ++i) {
1599                         if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1600                                                    priv->cm.num_frags - 1,
1601                                                    priv->cm.srq_ring[i].mapping,
1602                                                    GFP_KERNEL)) {
1603                                 ipoib_warn(priv, "failed to allocate "
1604                                            "receive buffer %d\n", i);
1605                                 ipoib_cm_dev_cleanup(dev);
1606                                 return -ENOMEM;
1607                         }
1608
1609                         if (ipoib_cm_post_receive_srq(dev, i)) {
1610                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1611                                            "failed for buf %d\n", i);
1612                                 ipoib_cm_dev_cleanup(dev);
1613                                 return -EIO;
1614                         }
1615                 }
1616         }
1617
1618         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1619         return 0;
1620 }
1621
1622 void ipoib_cm_dev_cleanup(struct net_device *dev)
1623 {
1624         struct ipoib_dev_priv *priv = netdev_priv(dev);
1625         int ret;
1626
1627         if (!priv->cm.srq)
1628                 return;
1629
1630         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1631
1632         ret = ib_destroy_srq(priv->cm.srq);
1633         if (ret)
1634                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1635
1636         priv->cm.srq = NULL;
1637         if (!priv->cm.srq_ring)
1638                 return;
1639
1640         ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1641         priv->cm.srq_ring = NULL;
1642 }