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 static struct ib_qp_attr ipoib_cm_err_attr = {
  67         .qp_state = IB_QPS_ERR
  68 };
  69
  70 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
  71
  72 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  73         .wr_id = IPOIB_CM_RX_DRAIN_WRID,
  74         .opcode = IB_WR_SEND,
  75 };
  76
  77 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  78                                struct ib_cm_event *event);
  79
  80 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
  81                                   u64 mapping[IPOIB_CM_RX_SG])
  82 {
  83         int i;
  84
  85         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
  86
  87         for (i = 0; i < frags; ++i)
  88                 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
  89 }
  90
  91 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
  92 {
  93         struct ipoib_dev_priv *priv = netdev_priv(dev);
  94         struct ib_recv_wr *bad_wr;
  95         int i, ret;
  96
  97         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
  98
  99         for (i = 0; i < priv->cm.num_frags; ++i)
 100                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
 101
 102         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
 103         if (unlikely(ret)) {
 104                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
 105                 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
 106                                       priv->cm.srq_ring[id].mapping);
 107                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
 108                 priv->cm.srq_ring[id].skb = NULL;
 109         }
 110
 111         return ret;
 112 }
 113
 114 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
 115                                         struct ipoib_cm_rx *rx,
 116                                         struct ib_recv_wr *wr,
 117                                         struct ib_sge *sge, int id)
 118 {
 119         struct ipoib_dev_priv *priv = netdev_priv(dev);
 120         struct ib_recv_wr *bad_wr;
 121         int i, ret;
 122
 123         wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 124
 125         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
 126                 sge[i].addr = rx->rx_ring[id].mapping[i];
 127
 128         ret = ib_post_recv(rx->qp, wr, &bad_wr);
 129         if (unlikely(ret)) {
 130                 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
 131                 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 132                                       rx->rx_ring[id].mapping);
 133                 dev_kfree_skb_any(rx->rx_ring[id].skb);
 134                 rx->rx_ring[id].skb = NULL;
 135         }
 136
 137         return ret;
 138 }
 139
 140 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
 141                                              struct ipoib_cm_rx_buf *rx_ring,
 142                                              int id, int frags,
 143                                              u64 mapping[IPOIB_CM_RX_SG],
 144                                              gfp_t gfp)
 145 {
 146         struct ipoib_dev_priv *priv = netdev_priv(dev);
 147         struct sk_buff *skb;
 148         int i;
 149
 150         skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
 151         if (unlikely(!skb))
 152                 return NULL;
 153
 154         /*
 155          * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
 156          * IP header to a multiple of 16.
 157          */
 158         skb_reserve(skb, 12);
 159
 160         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 161                                        DMA_FROM_DEVICE);
 162         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 163                 dev_kfree_skb_any(skb);
 164                 return NULL;
 165         }
 166
 167         for (i = 0; i < frags; i++) {
 168                 struct page *page = alloc_page(gfp);
 169
 170                 if (!page)
 171                         goto partial_error;
 172                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 173
 174                 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
 175                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
 176                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 177                         goto partial_error;
 178         }
 179
 180         rx_ring[id].skb = skb;
 181         return skb;
 182
 183 partial_error:
 184
 185         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 186
 187         for (; i > 0; --i)
 188                 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
 189
 190         dev_kfree_skb_any(skb);
 191         return NULL;
 192 }
 193
 194 static void ipoib_cm_free_rx_ring(struct net_device *dev,
 195                                   struct ipoib_cm_rx_buf *rx_ring)
 196 {
 197         struct ipoib_dev_priv *priv = netdev_priv(dev);
 198         int i;
 199
 200         for (i = 0; i < ipoib_recvq_size; ++i)
 201                 if (rx_ring[i].skb) {
 202                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 203                                               rx_ring[i].mapping);
 204                         dev_kfree_skb_any(rx_ring[i].skb);
 205                 }
 206
 207         vfree(rx_ring);
 208 }
 209
 210 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 211 {
 212         struct ib_send_wr *bad_wr;
 213         struct ipoib_cm_rx *p;
 214
 215         /* We only reserved 1 extra slot in CQ for drain WRs, so
 216          * make sure we have at most 1 outstanding WR. */
 217         if (list_empty(&priv->cm.rx_flush_list) ||
 218             !list_empty(&priv->cm.rx_drain_list))
 219                 return;
 220
 221         /*
 222          * QPs on flush list are error state.  This way, a "flush
 223          * error" WC will be immediately generated for each WR we post.
 224          */
 225         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 226         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
 227                 ipoib_warn(priv, "failed to post drain wr\n");
 228
 229         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 230 }
 231
 232 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 233 {
 234         struct ipoib_cm_rx *p = ctx;
 235         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 236         unsigned long flags;
 237
 238         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 239                 return;
 240
 241         spin_lock_irqsave(&priv->lock, flags);
 242         list_move(&p->list, &priv->cm.rx_flush_list);
 243         p->state = IPOIB_CM_RX_FLUSH;
 244         ipoib_cm_start_rx_drain(priv);
 245         spin_unlock_irqrestore(&priv->lock, flags);
 246 }
 247
 248 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 249                                            struct ipoib_cm_rx *p)
 250 {
 251         struct ipoib_dev_priv *priv = netdev_priv(dev);
 252         struct ib_qp_init_attr attr = {
 253                 .event_handler = ipoib_cm_rx_event_handler,
 254                 .send_cq = priv->recv_cq, /* For drain WR */
 255                 .recv_cq = priv->recv_cq,
 256                 .srq = priv->cm.srq,
 257                 .cap.max_send_wr = 1, /* For drain WR */
 258                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 259                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 260                 .qp_type = IB_QPT_RC,
 261                 .qp_context = p,
 262         };
 263
 264         if (!ipoib_cm_has_srq(dev)) {
 265                 attr.cap.max_recv_wr  = ipoib_recvq_size;
 266                 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
 267         }
 268
 269         return ib_create_qp(priv->pd, &attr);
 270 }
 271
 272 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 273                                  struct ib_cm_id *cm_id, struct ib_qp *qp,
 274                                  unsigned psn)
 275 {
 276         struct ipoib_dev_priv *priv = netdev_priv(dev);
 277         struct ib_qp_attr qp_attr;
 278         int qp_attr_mask, ret;
 279
 280         qp_attr.qp_state = IB_QPS_INIT;
 281         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 282         if (ret) {
 283                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 284                 return ret;
 285         }
 286         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 287         if (ret) {
 288                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 289                 return ret;
 290         }
 291         qp_attr.qp_state = IB_QPS_RTR;
 292         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 293         if (ret) {
 294                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 295                 return ret;
 296         }
 297         qp_attr.rq_psn = psn;
 298         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 299         if (ret) {
 300                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 301                 return ret;
 302         }
 303
 304         /*
 305          * Current Mellanox HCA firmware won't generate completions
 306          * with error for drain WRs unless the QP has been moved to
 307          * RTS first. This work-around leaves a window where a QP has
 308          * moved to error asynchronously, but this will eventually get
 309          * fixed in firmware, so let's not error out if modify QP
 310          * fails.
 311          */
 312         qp_attr.qp_state = IB_QPS_RTS;
 313         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 314         if (ret) {
 315                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 316                 return 0;
 317         }
 318         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 319         if (ret) {
 320                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 321                 return 0;
 322         }
 323
 324         return 0;
 325 }
 326
 327 static void ipoib_cm_init_rx_wr(struct net_device *dev,
 328                                 struct ib_recv_wr *wr,
 329                                 struct ib_sge *sge)
 330 {
 331         struct ipoib_dev_priv *priv = netdev_priv(dev);
 332         int i;
 333
 334         for (i = 0; i < priv->cm.num_frags; ++i)
 335                 sge[i].lkey = priv->pd->local_dma_lkey;
 336
 337         sge[0].length = IPOIB_CM_HEAD_SIZE;
 338         for (i = 1; i < priv->cm.num_frags; ++i)
 339                 sge[i].length = PAGE_SIZE;
 340
 341         wr->next    = NULL;
 342         wr->sg_list = sge;
 343         wr->num_sge = priv->cm.num_frags;
 344 }
 345
 346 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
 347                                    struct ipoib_cm_rx *rx)
 348 {
 349         struct ipoib_dev_priv *priv = netdev_priv(dev);
 350         struct {
 351                 struct ib_recv_wr wr;
 352                 struct ib_sge sge[IPOIB_CM_RX_SG];
 353         } *t;
 354         int ret;
 355         int i;
 356
 357         rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
 358         if (!rx->rx_ring) {
 359                 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
 360                        priv->ca->name, ipoib_recvq_size);
 361                 return -ENOMEM;
 362         }
 363
 364         t = kmalloc(sizeof *t, GFP_KERNEL);
 365         if (!t) {
 366                 ret = -ENOMEM;
 367                 goto err_free;
 368         }
 369
 370         ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
 371
 372         spin_lock_irq(&priv->lock);
 373
 374         if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
 375                 spin_unlock_irq(&priv->lock);
 376                 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
 377                 ret = -EINVAL;
 378                 goto err_free;
 379         } else
 380                 ++priv->cm.nonsrq_conn_qp;
 381
 382         spin_unlock_irq(&priv->lock);
 383
 384         for (i = 0; i < ipoib_recvq_size; ++i) {
 385                 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
 386                                            rx->rx_ring[i].mapping,
 387                                            GFP_KERNEL)) {
 388                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 389                         ret = -ENOMEM;
 390                         goto err_count;
 391                 }
 392                 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
 393                 if (ret) {
 394                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
 395                                    "failed for buf %d\n", i);
 396                         ret = -EIO;
 397                         goto err_count;
 398                 }
 399         }
 400
 401         rx->recv_count = ipoib_recvq_size;
 402
 403         kfree(t);
 404
 405         return 0;
 406
 407 err_count:
 408         spin_lock_irq(&priv->lock);
 409         --priv->cm.nonsrq_conn_qp;
 410         spin_unlock_irq(&priv->lock);
 411
 412 err_free:
 413         kfree(t);
 414         ipoib_cm_free_rx_ring(dev, rx->rx_ring);
 415
 416         return ret;
 417 }
 418
 419 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 420                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 421                              unsigned psn)
 422 {
 423         struct ipoib_dev_priv *priv = netdev_priv(dev);
 424         struct ipoib_cm_data data = {};
 425         struct ib_cm_rep_param rep = {};
 426
 427         data.qpn = cpu_to_be32(priv->qp->qp_num);
 428         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 429
 430         rep.private_data = &data;
 431         rep.private_data_len = sizeof data;
 432         rep.flow_control = 0;
 433         rep.rnr_retry_count = req->rnr_retry_count;
 434         rep.srq = ipoib_cm_has_srq(dev);
 435         rep.qp_num = qp->qp_num;
 436         rep.starting_psn = psn;
 437         return ib_send_cm_rep(cm_id, &rep);
 438 }
 439
 440 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 441 {
 442         struct net_device *dev = cm_id->context;
 443         struct ipoib_dev_priv *priv = netdev_priv(dev);
 444         struct ipoib_cm_rx *p;
 445         unsigned psn;
 446         int ret;
 447
 448         ipoib_dbg(priv, "REQ arrived\n");
 449         p = kzalloc(sizeof *p, GFP_KERNEL);
 450         if (!p)
 451                 return -ENOMEM;
 452         p->dev = dev;
 453         p->id = cm_id;
 454         cm_id->context = p;
 455         p->state = IPOIB_CM_RX_LIVE;
 456         p->jiffies = jiffies;
 457         INIT_LIST_HEAD(&p->list);
 458
 459         p->qp = ipoib_cm_create_rx_qp(dev, p);
 460         if (IS_ERR(p->qp)) {
 461                 ret = PTR_ERR(p->qp);
 462                 goto err_qp;
 463         }
 464
 465         psn = prandom_u32() & 0xffffff;
 466         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 467         if (ret)
 468                 goto err_modify;
 469
 470         if (!ipoib_cm_has_srq(dev)) {
 471                 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
 472                 if (ret)
 473                         goto err_modify;
 474         }
 475
 476         spin_lock_irq(&priv->lock);
 477         queue_delayed_work(priv->wq,
 478                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 479         /* Add this entry to passive ids list head, but do not re-add it
 480          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 481         p->jiffies = jiffies;
 482         if (p->state == IPOIB_CM_RX_LIVE)
 483                 list_move(&p->list, &priv->cm.passive_ids);
 484         spin_unlock_irq(&priv->lock);
 485
 486         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 487         if (ret) {
 488                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 489                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 490                         ipoib_warn(priv, "unable to move qp to error state\n");
 491         }
 492         return 0;
 493
 494 err_modify:
 495         ib_destroy_qp(p->qp);
 496 err_qp:
 497         kfree(p);
 498         return ret;
 499 }
 500
 501 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 502                                struct ib_cm_event *event)
 503 {
 504         struct ipoib_cm_rx *p;
 505         struct ipoib_dev_priv *priv;
 506
 507         switch (event->event) {
 508         case IB_CM_REQ_RECEIVED:
 509                 return ipoib_cm_req_handler(cm_id, event);
 510         case IB_CM_DREQ_RECEIVED:
 511                 p = cm_id->context;
 512                 ib_send_cm_drep(cm_id, NULL, 0);
 513                 /* Fall through */
 514         case IB_CM_REJ_RECEIVED:
 515                 p = cm_id->context;
 516                 priv = netdev_priv(p->dev);
 517                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 518                         ipoib_warn(priv, "unable to move qp to error state\n");
 519                 /* Fall through */
 520         default:
 521                 return 0;
 522         }
 523 }
 524 /* Adjust length of skb with fragments to match received data */
 525 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 526                           unsigned int length, struct sk_buff *toskb)
 527 {
 528         int i, num_frags;
 529         unsigned int size;
 530
 531         /* put header into skb */
 532         size = min(length, hdr_space);
 533         skb->tail += size;
 534         skb->len += size;
 535         length -= size;
 536
 537         num_frags = skb_shinfo(skb)->nr_frags;
 538         for (i = 0; i < num_frags; i++) {
 539                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 540
 541                 if (length == 0) {
 542                         /* don't need this page */
 543                         skb_fill_page_desc(toskb, i, skb_frag_page(frag),
 544                                            0, PAGE_SIZE);
 545                         --skb_shinfo(skb)->nr_frags;
 546                 } else {
 547                         size = min(length, (unsigned) PAGE_SIZE);
 548
 549                         skb_frag_size_set(frag, size);
 550                         skb->data_len += size;
 551                         skb->truesize += size;
 552                         skb->len += size;
 553                         length -= size;
 554                 }
 555         }
 556 }
 557
 558 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 559 {
 560         struct ipoib_dev_priv *priv = netdev_priv(dev);
 561         struct ipoib_cm_rx_buf *rx_ring;
 562         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
 563         struct sk_buff *skb, *newskb;
 564         struct ipoib_cm_rx *p;
 565         unsigned long flags;
 566         u64 mapping[IPOIB_CM_RX_SG];
 567         int frags;
 568         int has_srq;
 569         struct sk_buff *small_skb;
 570
 571         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 572                        wr_id, wc->status);
 573
 574         if (unlikely(wr_id >= ipoib_recvq_size)) {
 575                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
 576                         spin_lock_irqsave(&priv->lock, flags);
 577                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 578                         ipoib_cm_start_rx_drain(priv);
 579                         queue_work(priv->wq, &priv->cm.rx_reap_task);
 580                         spin_unlock_irqrestore(&priv->lock, flags);
 581                 } else
 582                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 583                                    wr_id, ipoib_recvq_size);
 584                 return;
 585         }
 586
 587         p = wc->qp->qp_context;
 588
 589         has_srq = ipoib_cm_has_srq(dev);
 590         rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
 591
 592         skb = rx_ring[wr_id].skb;
 593
 594         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 595                 ipoib_dbg(priv, "cm recv error "
 596                            "(status=%d, wrid=%d vend_err %x)\n",
 597                            wc->status, wr_id, wc->vendor_err);
 598                 ++dev->stats.rx_dropped;
 599                 if (has_srq)
 600                         goto repost;
 601                 else {
 602                         if (!--p->recv_count) {
 603                                 spin_lock_irqsave(&priv->lock, flags);
 604                                 list_move(&p->list, &priv->cm.rx_reap_list);
 605                                 spin_unlock_irqrestore(&priv->lock, flags);
 606                                 queue_work(priv->wq, &priv->cm.rx_reap_task);
 607                         }
 608                         return;
 609                 }
 610         }
 611
 612         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
 613                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 614                         spin_lock_irqsave(&priv->lock, flags);
 615                         p->jiffies = jiffies;
 616                         /* Move this entry to list head, but do not re-add it
 617                          * if it has been moved out of list. */
 618                         if (p->state == IPOIB_CM_RX_LIVE)
 619                                 list_move(&p->list, &priv->cm.passive_ids);
 620                         spin_unlock_irqrestore(&priv->lock, flags);
 621                 }
 622         }
 623
 624         if (wc->byte_len < IPOIB_CM_COPYBREAK) {
 625                 int dlen = wc->byte_len;
 626
 627                 small_skb = dev_alloc_skb(dlen + 12);
 628                 if (small_skb) {
 629                         skb_reserve(small_skb, 12);
 630                         ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
 631                                                    dlen, DMA_FROM_DEVICE);
 632                         skb_copy_from_linear_data(skb, small_skb->data, dlen);
 633                         ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
 634                                                       dlen, DMA_FROM_DEVICE);
 635                         skb_put(small_skb, dlen);
 636                         skb = small_skb;
 637                         goto copied;
 638                 }
 639         }
 640
 641         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
 642                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
 643
 644         newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
 645                                        mapping, GFP_ATOMIC);
 646         if (unlikely(!newskb)) {
 647                 /*
 648                  * If we can't allocate a new RX buffer, dump
 649                  * this packet and reuse the old buffer.
 650                  */
 651                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 652                 ++dev->stats.rx_dropped;
 653                 goto repost;
 654         }
 655
 656         ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
 657         memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
 658
 659         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 660                        wc->byte_len, wc->slid);
 661
 662         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 663
 664 copied:
 665         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 666         skb_reset_mac_header(skb);
 667         skb_pull(skb, IPOIB_ENCAP_LEN);
 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
 714         if (unlikely(skb->len > tx->mtu)) {
 715                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 716                            skb->len, tx->mtu);
 717                 ++dev->stats.tx_dropped;
 718                 ++dev->stats.tx_errors;
 719                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 720                 return;
 721         }
 722
 723         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 724                        tx->tx_head, skb->len, tx->qp->qp_num);
 725
 726         /*
 727          * We put the skb into the tx_ring _before_ we call post_send()
 728          * because it's entirely possible that the completion handler will
 729          * run before we execute anything after the post_send().  That
 730          * means we have to make sure everything is properly recorded and
 731          * our state is consistent before we call post_send().
 732          */
 733         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 734         tx_req->skb = skb;
 735
 736         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 737                 ++dev->stats.tx_errors;
 738                 dev_kfree_skb_any(skb);
 739                 return;
 740         }
 741
 742         skb_orphan(skb);
 743         skb_dst_drop(skb);
 744
 745         rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
 746         if (unlikely(rc)) {
 747                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 748                 ++dev->stats.tx_errors;
 749                 ipoib_dma_unmap_tx(priv, tx_req);
 750                 dev_kfree_skb_any(skb);
 751         } else {
 752                 dev->trans_start = jiffies;
 753                 ++tx->tx_head;
 754
 755                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 756                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 757                                   tx->qp->qp_num);
 758                         netif_stop_queue(dev);
 759                         rc = ib_req_notify_cq(priv->send_cq,
 760                                 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
 761                         if (rc < 0)
 762                                 ipoib_warn(priv, "request notify on send CQ failed\n");
 763                         else if (rc)
 764                                 ipoib_send_comp_handler(priv->send_cq, dev);
 765                 }
 766         }
 767 }
 768
 769 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 770 {
 771         struct ipoib_dev_priv *priv = netdev_priv(dev);
 772         struct ipoib_cm_tx *tx = wc->qp->qp_context;
 773         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 774         struct ipoib_tx_buf *tx_req;
 775         unsigned long flags;
 776
 777         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 778                        wr_id, wc->status);
 779
 780         if (unlikely(wr_id >= ipoib_sendq_size)) {
 781                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 782                            wr_id, ipoib_sendq_size);
 783                 return;
 784         }
 785
 786         tx_req = &tx->tx_ring[wr_id];
 787
 788         ipoib_dma_unmap_tx(priv, tx_req);
 789
 790         /* FIXME: is this right? Shouldn't we only increment on success? */
 791         ++dev->stats.tx_packets;
 792         dev->stats.tx_bytes += tx_req->skb->len;
 793
 794         dev_kfree_skb_any(tx_req->skb);
 795
 796         netif_tx_lock(dev);
 797
 798         ++tx->tx_tail;
 799         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 800             netif_queue_stopped(dev) &&
 801             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 802                 netif_wake_queue(dev);
 803
 804         if (wc->status != IB_WC_SUCCESS &&
 805             wc->status != IB_WC_WR_FLUSH_ERR) {
 806                 struct ipoib_neigh *neigh;
 807
 808                 ipoib_dbg(priv, "failed cm send event "
 809                            "(status=%d, wrid=%d vend_err %x)\n",
 810                            wc->status, wr_id, wc->vendor_err);
 811
 812                 spin_lock_irqsave(&priv->lock, flags);
 813                 neigh = tx->neigh;
 814
 815                 if (neigh) {
 816                         neigh->cm = NULL;
 817                         ipoib_neigh_free(neigh);
 818
 819                         tx->neigh = NULL;
 820                 }
 821
 822                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 823                         list_move(&tx->list, &priv->cm.reap_list);
 824                         queue_work(priv->wq, &priv->cm.reap_task);
 825                 }
 826
 827                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 828
 829                 spin_unlock_irqrestore(&priv->lock, flags);
 830         }
 831
 832         netif_tx_unlock(dev);
 833 }
 834
 835 int ipoib_cm_dev_open(struct net_device *dev)
 836 {
 837         struct ipoib_dev_priv *priv = netdev_priv(dev);
 838         int ret;
 839
 840         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 841                 return 0;
 842
 843         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 844         if (IS_ERR(priv->cm.id)) {
 845                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 846                 ret = PTR_ERR(priv->cm.id);
 847                 goto err_cm;
 848         }
 849
 850         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 851                            0);
 852         if (ret) {
 853                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 854                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 855                 goto err_listen;
 856         }
 857
 858         return 0;
 859
 860 err_listen:
 861         ib_destroy_cm_id(priv->cm.id);
 862 err_cm:
 863         priv->cm.id = NULL;
 864         return ret;
 865 }
 866
 867 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
 868 {
 869         struct ipoib_dev_priv *priv = netdev_priv(dev);
 870         struct ipoib_cm_rx *rx, *n;
 871         LIST_HEAD(list);
 872
 873         spin_lock_irq(&priv->lock);
 874         list_splice_init(&priv->cm.rx_reap_list, &list);
 875         spin_unlock_irq(&priv->lock);
 876
 877         list_for_each_entry_safe(rx, n, &list, list) {
 878                 ib_destroy_cm_id(rx->id);
 879                 ib_destroy_qp(rx->qp);
 880                 if (!ipoib_cm_has_srq(dev)) {
 881                         ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
 882                         spin_lock_irq(&priv->lock);
 883                         --priv->cm.nonsrq_conn_qp;
 884                         spin_unlock_irq(&priv->lock);
 885                 }
 886                 kfree(rx);
 887         }
 888 }
 889
 890 void ipoib_cm_dev_stop(struct net_device *dev)
 891 {
 892         struct ipoib_dev_priv *priv = netdev_priv(dev);
 893         struct ipoib_cm_rx *p;
 894         unsigned long begin;
 895         int ret;
 896
 897         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 898                 return;
 899
 900         ib_destroy_cm_id(priv->cm.id);
 901         priv->cm.id = NULL;
 902
 903         spin_lock_irq(&priv->lock);
 904         while (!list_empty(&priv->cm.passive_ids)) {
 905                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 906                 list_move(&p->list, &priv->cm.rx_error_list);
 907                 p->state = IPOIB_CM_RX_ERROR;
 908                 spin_unlock_irq(&priv->lock);
 909                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 910                 if (ret)
 911                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 912                 spin_lock_irq(&priv->lock);
 913         }
 914
 915         /* Wait for all RX to be drained */
 916         begin = jiffies;
 917
 918         while (!list_empty(&priv->cm.rx_error_list) ||
 919                !list_empty(&priv->cm.rx_flush_list) ||
 920                !list_empty(&priv->cm.rx_drain_list)) {
 921                 if (time_after(jiffies, begin + 5 * HZ)) {
 922                         ipoib_warn(priv, "RX drain timing out\n");
 923
 924                         /*
 925                          * assume the HW is wedged and just free up everything.
 926                          */
 927                         list_splice_init(&priv->cm.rx_flush_list,
 928                                          &priv->cm.rx_reap_list);
 929                         list_splice_init(&priv->cm.rx_error_list,
 930                                          &priv->cm.rx_reap_list);
 931                         list_splice_init(&priv->cm.rx_drain_list,
 932                                          &priv->cm.rx_reap_list);
 933                         break;
 934                 }
 935                 spin_unlock_irq(&priv->lock);
 936                 msleep(1);
 937                 ipoib_drain_cq(dev);
 938                 spin_lock_irq(&priv->lock);
 939         }
 940
 941         spin_unlock_irq(&priv->lock);
 942
 943         ipoib_cm_free_rx_reap_list(dev);
 944
 945         cancel_delayed_work(&priv->cm.stale_task);
 946 }
 947
 948 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 949 {
 950         struct ipoib_cm_tx *p = cm_id->context;
 951         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
 952         struct ipoib_cm_data *data = event->private_data;
 953         struct sk_buff_head skqueue;
 954         struct ib_qp_attr qp_attr;
 955         int qp_attr_mask, ret;
 956         struct sk_buff *skb;
 957
 958         p->mtu = be32_to_cpu(data->mtu);
 959
 960         if (p->mtu <= IPOIB_ENCAP_LEN) {
 961                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 962                            p->mtu, IPOIB_ENCAP_LEN);
 963                 return -EINVAL;
 964         }
 965
 966         qp_attr.qp_state = IB_QPS_RTR;
 967         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 968         if (ret) {
 969                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 970                 return ret;
 971         }
 972
 973         qp_attr.rq_psn = 0 /* FIXME */;
 974         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 975         if (ret) {
 976                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 977                 return ret;
 978         }
 979
 980         qp_attr.qp_state = IB_QPS_RTS;
 981         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 982         if (ret) {
 983                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 984                 return ret;
 985         }
 986         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 987         if (ret) {
 988                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 989                 return ret;
 990         }
 991
 992         skb_queue_head_init(&skqueue);
 993
 994         spin_lock_irq(&priv->lock);
 995         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
 996         if (p->neigh)
 997                 while ((skb = __skb_dequeue(&p->neigh->queue)))
 998                         __skb_queue_tail(&skqueue, skb);
 999         spin_unlock_irq(&priv->lock);
1000
1001         while ((skb = __skb_dequeue(&skqueue))) {
1002                 skb->dev = p->dev;
1003                 if (dev_queue_xmit(skb))
1004                         ipoib_warn(priv, "dev_queue_xmit failed "
1005                                    "to requeue packet\n");
1006         }
1007
1008         ret = ib_send_cm_rtu(cm_id, NULL, 0);
1009         if (ret) {
1010                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1011                 return ret;
1012         }
1013         return 0;
1014 }
1015
1016 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1017 {
1018         struct ipoib_dev_priv *priv = netdev_priv(dev);
1019         struct ib_qp_init_attr attr = {
1020                 .send_cq                = priv->recv_cq,
1021                 .recv_cq                = priv->recv_cq,
1022                 .srq                    = priv->cm.srq,
1023                 .cap.max_send_wr        = ipoib_sendq_size,
1024                 .cap.max_send_sge       = 1,
1025                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
1026                 .qp_type                = IB_QPT_RC,
1027                 .qp_context             = tx,
1028                 .create_flags           = IB_QP_CREATE_USE_GFP_NOIO
1029         };
1030
1031         struct ib_qp *tx_qp;
1032
1033         if (dev->features & NETIF_F_SG)
1034                 attr.cap.max_send_sge = MAX_SKB_FRAGS + 1;
1035
1036         tx_qp = ib_create_qp(priv->pd, &attr);
1037         if (PTR_ERR(tx_qp) == -EINVAL) {
1038                 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
1039                 tx_qp = ib_create_qp(priv->pd, &attr);
1040         }
1041         return tx_qp;
1042 }
1043
1044 static int ipoib_cm_send_req(struct net_device *dev,
1045                              struct ib_cm_id *id, struct ib_qp *qp,
1046                              u32 qpn,
1047                              struct ib_sa_path_rec *pathrec)
1048 {
1049         struct ipoib_dev_priv *priv = netdev_priv(dev);
1050         struct ipoib_cm_data data = {};
1051         struct ib_cm_req_param req = {};
1052
1053         data.qpn = cpu_to_be32(priv->qp->qp_num);
1054         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1055
1056         req.primary_path                = pathrec;
1057         req.alternate_path              = NULL;
1058         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1059         req.qp_num                      = qp->qp_num;
1060         req.qp_type                     = qp->qp_type;
1061         req.private_data                = &data;
1062         req.private_data_len            = sizeof data;
1063         req.flow_control                = 0;
1064
1065         req.starting_psn                = 0; /* FIXME */
1066
1067         /*
1068          * Pick some arbitrary defaults here; we could make these
1069          * module parameters if anyone cared about setting them.
1070          */
1071         req.responder_resources         = 4;
1072         req.remote_cm_response_timeout  = 20;
1073         req.local_cm_response_timeout   = 20;
1074         req.retry_count                 = 0; /* RFC draft warns against retries */
1075         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
1076         req.max_cm_retries              = 15;
1077         req.srq                         = ipoib_cm_has_srq(dev);
1078         return ib_send_cm_req(id, &req);
1079 }
1080
1081 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1082                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
1083 {
1084         struct ipoib_dev_priv *priv = netdev_priv(dev);
1085         struct ib_qp_attr qp_attr;
1086         int qp_attr_mask, ret;
1087         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1088         if (ret) {
1089                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1090                 return ret;
1091         }
1092
1093         qp_attr.qp_state = IB_QPS_INIT;
1094         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1095         qp_attr.port_num = priv->port;
1096         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1097
1098         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1099         if (ret) {
1100                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1101                 return ret;
1102         }
1103         return 0;
1104 }
1105
1106 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1107                             struct ib_sa_path_rec *pathrec)
1108 {
1109         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1110         int ret;
1111
1112         p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
1113                                GFP_NOIO, PAGE_KERNEL);
1114         if (!p->tx_ring) {
1115                 ipoib_warn(priv, "failed to allocate tx ring\n");
1116                 ret = -ENOMEM;
1117                 goto err_tx;
1118         }
1119         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1120
1121         p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1122         if (IS_ERR(p->qp)) {
1123                 ret = PTR_ERR(p->qp);
1124                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1125                 goto err_qp;
1126         }
1127
1128         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1129         if (IS_ERR(p->id)) {
1130                 ret = PTR_ERR(p->id);
1131                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1132                 goto err_id;
1133         }
1134
1135         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
1136         if (ret) {
1137                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1138                 goto err_modify;
1139         }
1140
1141         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1142         if (ret) {
1143                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1144                 goto err_send_cm;
1145         }
1146
1147         ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1148                   p->qp->qp_num, pathrec->dgid.raw, qpn);
1149
1150         return 0;
1151
1152 err_send_cm:
1153 err_modify:
1154         ib_destroy_cm_id(p->id);
1155 err_id:
1156         p->id = NULL;
1157         ib_destroy_qp(p->qp);
1158 err_qp:
1159         p->qp = NULL;
1160         vfree(p->tx_ring);
1161 err_tx:
1162         return ret;
1163 }
1164
1165 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1166 {
1167         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1168         struct ipoib_tx_buf *tx_req;
1169         unsigned long begin;
1170
1171         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1172                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1173
1174         if (p->id)
1175                 ib_destroy_cm_id(p->id);
1176
1177         if (p->tx_ring) {
1178                 /* Wait for all sends to complete */
1179                 begin = jiffies;
1180                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1181                         if (time_after(jiffies, begin + 5 * HZ)) {
1182                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1183                                            p->tx_head - p->tx_tail);
1184                                 goto timeout;
1185                         }
1186
1187                         msleep(1);
1188                 }
1189         }
1190
1191 timeout:
1192
1193         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1194                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1195                 ipoib_dma_unmap_tx(priv, tx_req);
1196                 dev_kfree_skb_any(tx_req->skb);
1197                 ++p->tx_tail;
1198                 netif_tx_lock_bh(p->dev);
1199                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1200                     netif_queue_stopped(p->dev) &&
1201                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1202                         netif_wake_queue(p->dev);
1203                 netif_tx_unlock_bh(p->dev);
1204         }
1205
1206         if (p->qp)
1207                 ib_destroy_qp(p->qp);
1208
1209         vfree(p->tx_ring);
1210         kfree(p);
1211 }
1212
1213 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1214                                struct ib_cm_event *event)
1215 {
1216         struct ipoib_cm_tx *tx = cm_id->context;
1217         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1218         struct net_device *dev = priv->dev;
1219         struct ipoib_neigh *neigh;
1220         unsigned long flags;
1221         int ret;
1222
1223         switch (event->event) {
1224         case IB_CM_DREQ_RECEIVED:
1225                 ipoib_dbg(priv, "DREQ received.\n");
1226                 ib_send_cm_drep(cm_id, NULL, 0);
1227                 break;
1228         case IB_CM_REP_RECEIVED:
1229                 ipoib_dbg(priv, "REP received.\n");
1230                 ret = ipoib_cm_rep_handler(cm_id, event);
1231                 if (ret)
1232                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1233                                        NULL, 0, NULL, 0);
1234                 break;
1235         case IB_CM_REQ_ERROR:
1236         case IB_CM_REJ_RECEIVED:
1237         case IB_CM_TIMEWAIT_EXIT:
1238                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1239                 netif_tx_lock_bh(dev);
1240                 spin_lock_irqsave(&priv->lock, flags);
1241                 neigh = tx->neigh;
1242
1243                 if (neigh) {
1244                         neigh->cm = NULL;
1245                         ipoib_neigh_free(neigh);
1246
1247                         tx->neigh = NULL;
1248                 }
1249
1250                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1251                         list_move(&tx->list, &priv->cm.reap_list);
1252                         queue_work(priv->wq, &priv->cm.reap_task);
1253                 }
1254
1255                 spin_unlock_irqrestore(&priv->lock, flags);
1256                 netif_tx_unlock_bh(dev);
1257                 break;
1258         default:
1259                 break;
1260         }
1261
1262         return 0;
1263 }
1264
1265 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1266                                        struct ipoib_neigh *neigh)
1267 {
1268         struct ipoib_dev_priv *priv = netdev_priv(dev);
1269         struct ipoib_cm_tx *tx;
1270
1271         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1272         if (!tx)
1273                 return NULL;
1274
1275         neigh->cm = tx;
1276         tx->neigh = neigh;
1277         tx->path = path;
1278         tx->dev = dev;
1279         list_add(&tx->list, &priv->cm.start_list);
1280         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1281         queue_work(priv->wq, &priv->cm.start_task);
1282         return tx;
1283 }
1284
1285 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1286 {
1287         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1288         unsigned long flags;
1289         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1290                 spin_lock_irqsave(&priv->lock, flags);
1291                 list_move(&tx->list, &priv->cm.reap_list);
1292                 queue_work(priv->wq, &priv->cm.reap_task);
1293                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1294                           tx->neigh->daddr + 4);
1295                 tx->neigh = NULL;
1296                 spin_unlock_irqrestore(&priv->lock, flags);
1297         }
1298 }
1299
1300 #define QPN_AND_OPTIONS_OFFSET  4
1301
1302 static void ipoib_cm_tx_start(struct work_struct *work)
1303 {
1304         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1305                                                    cm.start_task);
1306         struct net_device *dev = priv->dev;
1307         struct ipoib_neigh *neigh;
1308         struct ipoib_cm_tx *p;
1309         unsigned long flags;
1310         struct ipoib_path *path;
1311         int ret;
1312
1313         struct ib_sa_path_rec pathrec;
1314         u32 qpn;
1315
1316         netif_tx_lock_bh(dev);
1317         spin_lock_irqsave(&priv->lock, flags);
1318
1319         while (!list_empty(&priv->cm.start_list)) {
1320                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1321                 list_del_init(&p->list);
1322                 neigh = p->neigh;
1323
1324                 qpn = IPOIB_QPN(neigh->daddr);
1325                 /*
1326                  * As long as the search is with these 2 locks,
1327                  * path existence indicates its validity.
1328                  */
1329                 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1330                 if (!path) {
1331                         pr_info("%s ignore not valid path %pI6\n",
1332                                 __func__,
1333                                 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1334                         goto free_neigh;
1335                 }
1336                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1337
1338                 spin_unlock_irqrestore(&priv->lock, flags);
1339                 netif_tx_unlock_bh(dev);
1340
1341                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1342
1343                 netif_tx_lock_bh(dev);
1344                 spin_lock_irqsave(&priv->lock, flags);
1345
1346                 if (ret) {
1347 free_neigh:
1348                         neigh = p->neigh;
1349                         if (neigh) {
1350                                 neigh->cm = NULL;
1351                                 ipoib_neigh_free(neigh);
1352                         }
1353                         list_del(&p->list);
1354                         kfree(p);
1355                 }
1356         }
1357
1358         spin_unlock_irqrestore(&priv->lock, flags);
1359         netif_tx_unlock_bh(dev);
1360 }
1361
1362 static void ipoib_cm_tx_reap(struct work_struct *work)
1363 {
1364         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1365                                                    cm.reap_task);
1366         struct net_device *dev = priv->dev;
1367         struct ipoib_cm_tx *p;
1368         unsigned long flags;
1369
1370         netif_tx_lock_bh(dev);
1371         spin_lock_irqsave(&priv->lock, flags);
1372
1373         while (!list_empty(&priv->cm.reap_list)) {
1374                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1375                 list_del(&p->list);
1376                 spin_unlock_irqrestore(&priv->lock, flags);
1377                 netif_tx_unlock_bh(dev);
1378                 ipoib_cm_tx_destroy(p);
1379                 netif_tx_lock_bh(dev);
1380                 spin_lock_irqsave(&priv->lock, flags);
1381         }
1382
1383         spin_unlock_irqrestore(&priv->lock, flags);
1384         netif_tx_unlock_bh(dev);
1385 }
1386
1387 static void ipoib_cm_skb_reap(struct work_struct *work)
1388 {
1389         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1390                                                    cm.skb_task);
1391         struct net_device *dev = priv->dev;
1392         struct sk_buff *skb;
1393         unsigned long flags;
1394         unsigned mtu = priv->mcast_mtu;
1395
1396         netif_tx_lock_bh(dev);
1397         spin_lock_irqsave(&priv->lock, flags);
1398
1399         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1400                 spin_unlock_irqrestore(&priv->lock, flags);
1401                 netif_tx_unlock_bh(dev);
1402
1403                 if (skb->protocol == htons(ETH_P_IP))
1404                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1405 #if IS_ENABLED(CONFIG_IPV6)
1406                 else if (skb->protocol == htons(ETH_P_IPV6))
1407                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1408 #endif
1409                 dev_kfree_skb_any(skb);
1410
1411                 netif_tx_lock_bh(dev);
1412                 spin_lock_irqsave(&priv->lock, flags);
1413         }
1414
1415         spin_unlock_irqrestore(&priv->lock, flags);
1416         netif_tx_unlock_bh(dev);
1417 }
1418
1419 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1420                            unsigned int mtu)
1421 {
1422         struct ipoib_dev_priv *priv = netdev_priv(dev);
1423         int e = skb_queue_empty(&priv->cm.skb_queue);
1424
1425         if (skb_dst(skb))
1426                 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1427
1428         skb_queue_tail(&priv->cm.skb_queue, skb);
1429         if (e)
1430                 queue_work(priv->wq, &priv->cm.skb_task);
1431 }
1432
1433 static void ipoib_cm_rx_reap(struct work_struct *work)
1434 {
1435         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1436                                                 cm.rx_reap_task)->dev);
1437 }
1438
1439 static void ipoib_cm_stale_task(struct work_struct *work)
1440 {
1441         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1442                                                    cm.stale_task.work);
1443         struct ipoib_cm_rx *p;
1444         int ret;
1445
1446         spin_lock_irq(&priv->lock);
1447         while (!list_empty(&priv->cm.passive_ids)) {
1448                 /* List is sorted by LRU, start from tail,
1449                  * stop when we see a recently used entry */
1450                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1451                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1452                         break;
1453                 list_move(&p->list, &priv->cm.rx_error_list);
1454                 p->state = IPOIB_CM_RX_ERROR;
1455                 spin_unlock_irq(&priv->lock);
1456                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1457                 if (ret)
1458                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1459                 spin_lock_irq(&priv->lock);
1460         }
1461
1462         if (!list_empty(&priv->cm.passive_ids))
1463                 queue_delayed_work(priv->wq,
1464                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1465         spin_unlock_irq(&priv->lock);
1466 }
1467
1468 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1469                          char *buf)
1470 {
1471         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1472
1473         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1474                 return sprintf(buf, "connected\n");
1475         else
1476                 return sprintf(buf, "datagram\n");
1477 }
1478
1479 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1480                         const char *buf, size_t count)
1481 {
1482         struct net_device *dev = to_net_dev(d);
1483         int ret;
1484
1485         if (!rtnl_trylock())
1486                 return restart_syscall();
1487
1488         ret = ipoib_set_mode(dev, buf);
1489
1490         rtnl_unlock();
1491
1492         if (!ret)
1493                 return count;
1494
1495         return ret;
1496 }
1497
1498 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1499
1500 int ipoib_cm_add_mode_attr(struct net_device *dev)
1501 {
1502         return device_create_file(&dev->dev, &dev_attr_mode);
1503 }
1504
1505 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1506 {
1507         struct ipoib_dev_priv *priv = netdev_priv(dev);
1508         struct ib_srq_init_attr srq_init_attr = {
1509                 .srq_type = IB_SRQT_BASIC,
1510                 .attr = {
1511                         .max_wr  = ipoib_recvq_size,
1512                         .max_sge = max_sge
1513                 }
1514         };
1515
1516         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1517         if (IS_ERR(priv->cm.srq)) {
1518                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1519                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1520                                priv->ca->name, PTR_ERR(priv->cm.srq));
1521                 priv->cm.srq = NULL;
1522                 return;
1523         }
1524
1525         priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1526         if (!priv->cm.srq_ring) {
1527                 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1528                        priv->ca->name, ipoib_recvq_size);
1529                 ib_destroy_srq(priv->cm.srq);
1530                 priv->cm.srq = NULL;
1531                 return;
1532         }
1533
1534 }
1535
1536 int ipoib_cm_dev_init(struct net_device *dev)
1537 {
1538         struct ipoib_dev_priv *priv = netdev_priv(dev);
1539         int i, ret;
1540         struct ib_device_attr attr;
1541
1542         INIT_LIST_HEAD(&priv->cm.passive_ids);
1543         INIT_LIST_HEAD(&priv->cm.reap_list);
1544         INIT_LIST_HEAD(&priv->cm.start_list);
1545         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1546         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1547         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1548         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1549         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1550         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1551         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1552         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1553         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1554
1555         skb_queue_head_init(&priv->cm.skb_queue);
1556
1557         ret = ib_query_device(priv->ca, &attr);
1558         if (ret) {
1559                 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1560                 return ret;
1561         }
1562
1563         ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1564
1565         attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1566         ipoib_cm_create_srq(dev, attr.max_srq_sge);
1567         if (ipoib_cm_has_srq(dev)) {
1568                 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1569                 priv->cm.num_frags  = attr.max_srq_sge;
1570                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1571                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1572         } else {
1573                 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1574                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1575         }
1576
1577         ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1578
1579         if (ipoib_cm_has_srq(dev)) {
1580                 for (i = 0; i < ipoib_recvq_size; ++i) {
1581                         if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1582                                                    priv->cm.num_frags - 1,
1583                                                    priv->cm.srq_ring[i].mapping,
1584                                                    GFP_KERNEL)) {
1585                                 ipoib_warn(priv, "failed to allocate "
1586                                            "receive buffer %d\n", i);
1587                                 ipoib_cm_dev_cleanup(dev);
1588                                 return -ENOMEM;
1589                         }
1590
1591                         if (ipoib_cm_post_receive_srq(dev, i)) {
1592                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1593                                            "failed for buf %d\n", i);
1594                                 ipoib_cm_dev_cleanup(dev);
1595                                 return -EIO;
1596                         }
1597                 }
1598         }
1599
1600         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1601         return 0;
1602 }
1603
1604 void ipoib_cm_dev_cleanup(struct net_device *dev)
1605 {
1606         struct ipoib_dev_priv *priv = netdev_priv(dev);
1607         int ret;
1608
1609         if (!priv->cm.srq)
1610                 return;
1611
1612         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1613
1614         ret = ib_destroy_srq(priv->cm.srq);
1615         if (ret)
1616                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1617
1618         priv->cm.srq = NULL;
1619         if (!priv->cm.srq_ring)
1620                 return;
1621
1622         ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1623         priv->cm.srq_ring = NULL;
1624 }