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 #include <linux/sched/signal.h>
  42 #include <linux/sched/mm.h>
  43
  44 #include "ipoib.h"
  45
  46 int ipoib_max_conn_qp = 128;
  47
  48 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
  49 MODULE_PARM_DESC(max_nonsrq_conn_qp,
  50                  "Max number of connected-mode QPs per interface "
  51                  "(applied only if shared receive queue is not available)");
  52
  53 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  54 static int data_debug_level;
  55
  56 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  57 MODULE_PARM_DESC(cm_data_debug_level,
  58                  "Enable data path debug tracing for connected mode if > 0");
  59 #endif
  60
  61 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  62
  63 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
  64 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
  65 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
  66 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
  67
  68 #define IPOIB_CM_RX_RESERVE     (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
  69
  70 static struct ib_qp_attr ipoib_cm_err_attr = {
  71         .qp_state = IB_QPS_ERR
  72 };
  73
  74 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
  75
  76 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  77         .opcode = IB_WR_SEND,
  78 };
  79
  80 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  81                                struct ib_cm_event *event);
  82
  83 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
  84                                   u64 mapping[IPOIB_CM_RX_SG])
  85 {
  86         int i;
  87
  88         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
  89
  90         for (i = 0; i < frags; ++i)
  91                 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
  92 }
  93
  94 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
  95 {
  96         struct ipoib_dev_priv *priv = ipoib_priv(dev);
  97         struct ib_recv_wr *bad_wr;
  98         int i, ret;
  99
 100         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 101
 102         for (i = 0; i < priv->cm.num_frags; ++i)
 103                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
 104
 105         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
 106         if (unlikely(ret)) {
 107                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
 108                 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
 109                                       priv->cm.srq_ring[id].mapping);
 110                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
 111                 priv->cm.srq_ring[id].skb = NULL;
 112         }
 113
 114         return ret;
 115 }
 116
 117 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
 118                                         struct ipoib_cm_rx *rx,
 119                                         struct ib_recv_wr *wr,
 120                                         struct ib_sge *sge, int id)
 121 {
 122         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 123         struct ib_recv_wr *bad_wr;
 124         int i, ret;
 125
 126         wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 127
 128         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
 129                 sge[i].addr = rx->rx_ring[id].mapping[i];
 130
 131         ret = ib_post_recv(rx->qp, wr, &bad_wr);
 132         if (unlikely(ret)) {
 133                 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
 134                 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 135                                       rx->rx_ring[id].mapping);
 136                 dev_kfree_skb_any(rx->rx_ring[id].skb);
 137                 rx->rx_ring[id].skb = NULL;
 138         }
 139
 140         return ret;
 141 }
 142
 143 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
 144                                              struct ipoib_cm_rx_buf *rx_ring,
 145                                              int id, int frags,
 146                                              u64 mapping[IPOIB_CM_RX_SG],
 147                                              gfp_t gfp)
 148 {
 149         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 150         struct sk_buff *skb;
 151         int i;
 152
 153         skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
 154         if (unlikely(!skb))
 155                 return NULL;
 156
 157         /*
 158          * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
 159          * IP header to a multiple of 16.
 160          */
 161         skb_reserve(skb, IPOIB_CM_RX_RESERVE);
 162
 163         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 164                                        DMA_FROM_DEVICE);
 165         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 166                 dev_kfree_skb_any(skb);
 167                 return NULL;
 168         }
 169
 170         for (i = 0; i < frags; i++) {
 171                 struct page *page = alloc_page(gfp);
 172
 173                 if (!page)
 174                         goto partial_error;
 175                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 176
 177                 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
 178                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
 179                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 180                         goto partial_error;
 181         }
 182
 183         rx_ring[id].skb = skb;
 184         return skb;
 185
 186 partial_error:
 187
 188         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 189
 190         for (; i > 0; --i)
 191                 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
 192
 193         dev_kfree_skb_any(skb);
 194         return NULL;
 195 }
 196
 197 static void ipoib_cm_free_rx_ring(struct net_device *dev,
 198                                   struct ipoib_cm_rx_buf *rx_ring)
 199 {
 200         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 201         int i;
 202
 203         for (i = 0; i < ipoib_recvq_size; ++i)
 204                 if (rx_ring[i].skb) {
 205                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 206                                               rx_ring[i].mapping);
 207                         dev_kfree_skb_any(rx_ring[i].skb);
 208                 }
 209
 210         vfree(rx_ring);
 211 }
 212
 213 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 214 {
 215         struct ib_send_wr *bad_wr;
 216         struct ipoib_cm_rx *p;
 217
 218         /* We only reserved 1 extra slot in CQ for drain WRs, so
 219          * make sure we have at most 1 outstanding WR. */
 220         if (list_empty(&priv->cm.rx_flush_list) ||
 221             !list_empty(&priv->cm.rx_drain_list))
 222                 return;
 223
 224         /*
 225          * QPs on flush list are error state.  This way, a "flush
 226          * error" WC will be immediately generated for each WR we post.
 227          */
 228         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 229         ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
 230         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
 231                 ipoib_warn(priv, "failed to post drain wr\n");
 232
 233         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 234 }
 235
 236 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 237 {
 238         struct ipoib_cm_rx *p = ctx;
 239         struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
 240         unsigned long flags;
 241
 242         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 243                 return;
 244
 245         spin_lock_irqsave(&priv->lock, flags);
 246         list_move(&p->list, &priv->cm.rx_flush_list);
 247         p->state = IPOIB_CM_RX_FLUSH;
 248         ipoib_cm_start_rx_drain(priv);
 249         spin_unlock_irqrestore(&priv->lock, flags);
 250 }
 251
 252 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 253                                            struct ipoib_cm_rx *p)
 254 {
 255         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 256         struct ib_qp_init_attr attr = {
 257                 .event_handler = ipoib_cm_rx_event_handler,
 258                 .send_cq = priv->recv_cq, /* For drain WR */
 259                 .recv_cq = priv->recv_cq,
 260                 .srq = priv->cm.srq,
 261                 .cap.max_send_wr = 1, /* For drain WR */
 262                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 263                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 264                 .qp_type = IB_QPT_RC,
 265                 .qp_context = p,
 266         };
 267
 268         if (!ipoib_cm_has_srq(dev)) {
 269                 attr.cap.max_recv_wr  = ipoib_recvq_size;
 270                 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
 271         }
 272
 273         return ib_create_qp(priv->pd, &attr);
 274 }
 275
 276 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 277                                  struct ib_cm_id *cm_id, struct ib_qp *qp,
 278                                  unsigned psn)
 279 {
 280         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 281         struct ib_qp_attr qp_attr;
 282         int qp_attr_mask, ret;
 283
 284         qp_attr.qp_state = IB_QPS_INIT;
 285         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 286         if (ret) {
 287                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 288                 return ret;
 289         }
 290         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 291         if (ret) {
 292                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 293                 return ret;
 294         }
 295         qp_attr.qp_state = IB_QPS_RTR;
 296         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 297         if (ret) {
 298                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 299                 return ret;
 300         }
 301         qp_attr.rq_psn = psn;
 302         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 303         if (ret) {
 304                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 305                 return ret;
 306         }
 307
 308         /*
 309          * Current Mellanox HCA firmware won't generate completions
 310          * with error for drain WRs unless the QP has been moved to
 311          * RTS first. This work-around leaves a window where a QP has
 312          * moved to error asynchronously, but this will eventually get
 313          * fixed in firmware, so let's not error out if modify QP
 314          * fails.
 315          */
 316         qp_attr.qp_state = IB_QPS_RTS;
 317         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 318         if (ret) {
 319                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 320                 return 0;
 321         }
 322         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 323         if (ret) {
 324                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 325                 return 0;
 326         }
 327
 328         return 0;
 329 }
 330
 331 static void ipoib_cm_init_rx_wr(struct net_device *dev,
 332                                 struct ib_recv_wr *wr,
 333                                 struct ib_sge *sge)
 334 {
 335         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 336         int i;
 337
 338         for (i = 0; i < priv->cm.num_frags; ++i)
 339                 sge[i].lkey = priv->pd->local_dma_lkey;
 340
 341         sge[0].length = IPOIB_CM_HEAD_SIZE;
 342         for (i = 1; i < priv->cm.num_frags; ++i)
 343                 sge[i].length = PAGE_SIZE;
 344
 345         wr->next    = NULL;
 346         wr->sg_list = sge;
 347         wr->num_sge = priv->cm.num_frags;
 348 }
 349
 350 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
 351                                    struct ipoib_cm_rx *rx)
 352 {
 353         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 354         struct {
 355                 struct ib_recv_wr wr;
 356                 struct ib_sge sge[IPOIB_CM_RX_SG];
 357         } *t;
 358         int ret;
 359         int i;
 360
 361         rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
 362         if (!rx->rx_ring)
 363                 return -ENOMEM;
 364
 365         t = kmalloc(sizeof *t, GFP_KERNEL);
 366         if (!t) {
 367                 ret = -ENOMEM;
 368                 goto err_free_1;
 369         }
 370
 371         ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
 372
 373         spin_lock_irq(&priv->lock);
 374
 375         if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
 376                 spin_unlock_irq(&priv->lock);
 377                 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
 378                 ret = -EINVAL;
 379                 goto err_free;
 380         } else
 381                 ++priv->cm.nonsrq_conn_qp;
 382
 383         spin_unlock_irq(&priv->lock);
 384
 385         for (i = 0; i < ipoib_recvq_size; ++i) {
 386                 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
 387                                            rx->rx_ring[i].mapping,
 388                                            GFP_KERNEL)) {
 389                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 390                         ret = -ENOMEM;
 391                         goto err_count;
 392                 }
 393                 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
 394                 if (ret) {
 395                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
 396                                    "failed for buf %d\n", i);
 397                         ret = -EIO;
 398                         goto err_count;
 399                 }
 400         }
 401
 402         rx->recv_count = ipoib_recvq_size;
 403
 404         kfree(t);
 405
 406         return 0;
 407
 408 err_count:
 409         spin_lock_irq(&priv->lock);
 410         --priv->cm.nonsrq_conn_qp;
 411         spin_unlock_irq(&priv->lock);
 412
 413 err_free:
 414         kfree(t);
 415
 416 err_free_1:
 417         ipoib_cm_free_rx_ring(dev, rx->rx_ring);
 418
 419         return ret;
 420 }
 421
 422 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 423                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 424                              unsigned psn)
 425 {
 426         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 427         struct ipoib_cm_data data = {};
 428         struct ib_cm_rep_param rep = {};
 429
 430         data.qpn = cpu_to_be32(priv->qp->qp_num);
 431         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 432
 433         rep.private_data = &data;
 434         rep.private_data_len = sizeof data;
 435         rep.flow_control = 0;
 436         rep.rnr_retry_count = req->rnr_retry_count;
 437         rep.srq = ipoib_cm_has_srq(dev);
 438         rep.qp_num = qp->qp_num;
 439         rep.starting_psn = psn;
 440         return ib_send_cm_rep(cm_id, &rep);
 441 }
 442
 443 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 444 {
 445         struct net_device *dev = cm_id->context;
 446         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 447         struct ipoib_cm_rx *p;
 448         unsigned psn;
 449         int ret;
 450
 451         ipoib_dbg(priv, "REQ arrived\n");
 452         p = kzalloc(sizeof *p, GFP_KERNEL);
 453         if (!p)
 454                 return -ENOMEM;
 455         p->dev = dev;
 456         p->id = cm_id;
 457         cm_id->context = p;
 458         p->state = IPOIB_CM_RX_LIVE;
 459         p->jiffies = jiffies;
 460         INIT_LIST_HEAD(&p->list);
 461
 462         p->qp = ipoib_cm_create_rx_qp(dev, p);
 463         if (IS_ERR(p->qp)) {
 464                 ret = PTR_ERR(p->qp);
 465                 goto err_qp;
 466         }
 467
 468         psn = prandom_u32() & 0xffffff;
 469         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 470         if (ret)
 471                 goto err_modify;
 472
 473         if (!ipoib_cm_has_srq(dev)) {
 474                 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
 475                 if (ret)
 476                         goto err_modify;
 477         }
 478
 479         spin_lock_irq(&priv->lock);
 480         queue_delayed_work(priv->wq,
 481                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 482         /* Add this entry to passive ids list head, but do not re-add it
 483          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 484         p->jiffies = jiffies;
 485         if (p->state == IPOIB_CM_RX_LIVE)
 486                 list_move(&p->list, &priv->cm.passive_ids);
 487         spin_unlock_irq(&priv->lock);
 488
 489         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 490         if (ret) {
 491                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 492                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 493                         ipoib_warn(priv, "unable to move qp to error state\n");
 494         }
 495         return 0;
 496
 497 err_modify:
 498         ib_destroy_qp(p->qp);
 499 err_qp:
 500         kfree(p);
 501         return ret;
 502 }
 503
 504 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 505                                struct ib_cm_event *event)
 506 {
 507         struct ipoib_cm_rx *p;
 508         struct ipoib_dev_priv *priv;
 509
 510         switch (event->event) {
 511         case IB_CM_REQ_RECEIVED:
 512                 return ipoib_cm_req_handler(cm_id, event);
 513         case IB_CM_DREQ_RECEIVED:
 514                 ib_send_cm_drep(cm_id, NULL, 0);
 515                 /* Fall through */
 516         case IB_CM_REJ_RECEIVED:
 517                 p = cm_id->context;
 518                 priv = ipoib_priv(p->dev);
 519                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 520                         ipoib_warn(priv, "unable to move qp to error state\n");
 521                 /* Fall through */
 522         default:
 523                 return 0;
 524         }
 525 }
 526 /* Adjust length of skb with fragments to match received data */
 527 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
 528                           unsigned int length, struct sk_buff *toskb)
 529 {
 530         int i, num_frags;
 531         unsigned int size;
 532
 533         /* put header into skb */
 534         size = min(length, hdr_space);
 535         skb->tail += size;
 536         skb->len += size;
 537         length -= size;
 538
 539         num_frags = skb_shinfo(skb)->nr_frags;
 540         for (i = 0; i < num_frags; i++) {
 541                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 542
 543                 if (length == 0) {
 544                         /* don't need this page */
 545                         skb_fill_page_desc(toskb, i, skb_frag_page(frag),
 546                                            0, PAGE_SIZE);
 547                         --skb_shinfo(skb)->nr_frags;
 548                 } else {
 549                         size = min(length, (unsigned) PAGE_SIZE);
 550
 551                         skb_frag_size_set(frag, size);
 552                         skb->data_len += size;
 553                         skb->truesize += size;
 554                         skb->len += size;
 555                         length -= size;
 556                 }
 557         }
 558 }
 559
 560 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 561 {
 562         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 563         struct ipoib_cm_rx_buf *rx_ring;
 564         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
 565         struct sk_buff *skb, *newskb;
 566         struct ipoib_cm_rx *p;
 567         unsigned long flags;
 568         u64 mapping[IPOIB_CM_RX_SG];
 569         int frags;
 570         int has_srq;
 571         struct sk_buff *small_skb;
 572
 573         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
 574                        wr_id, wc->status);
 575
 576         if (unlikely(wr_id >= ipoib_recvq_size)) {
 577                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
 578                         spin_lock_irqsave(&priv->lock, flags);
 579                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
 580                         ipoib_cm_start_rx_drain(priv);
 581                         queue_work(priv->wq, &priv->cm.rx_reap_task);
 582                         spin_unlock_irqrestore(&priv->lock, flags);
 583                 } else
 584                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
 585                                    wr_id, ipoib_recvq_size);
 586                 return;
 587         }
 588
 589         p = wc->qp->qp_context;
 590
 591         has_srq = ipoib_cm_has_srq(dev);
 592         rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
 593
 594         skb = rx_ring[wr_id].skb;
 595
 596         if (unlikely(wc->status != IB_WC_SUCCESS)) {
 597                 ipoib_dbg(priv, "cm recv error "
 598                            "(status=%d, wrid=%d vend_err %x)\n",
 599                            wc->status, wr_id, wc->vendor_err);
 600                 ++dev->stats.rx_dropped;
 601                 if (has_srq)
 602                         goto repost;
 603                 else {
 604                         if (!--p->recv_count) {
 605                                 spin_lock_irqsave(&priv->lock, flags);
 606                                 list_move(&p->list, &priv->cm.rx_reap_list);
 607                                 spin_unlock_irqrestore(&priv->lock, flags);
 608                                 queue_work(priv->wq, &priv->cm.rx_reap_task);
 609                         }
 610                         return;
 611                 }
 612         }
 613
 614         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
 615                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
 616                         spin_lock_irqsave(&priv->lock, flags);
 617                         p->jiffies = jiffies;
 618                         /* Move this entry to list head, but do not re-add it
 619                          * if it has been moved out of list. */
 620                         if (p->state == IPOIB_CM_RX_LIVE)
 621                                 list_move(&p->list, &priv->cm.passive_ids);
 622                         spin_unlock_irqrestore(&priv->lock, flags);
 623                 }
 624         }
 625
 626         if (wc->byte_len < IPOIB_CM_COPYBREAK) {
 627                 int dlen = wc->byte_len;
 628
 629                 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE);
 630                 if (small_skb) {
 631                         skb_reserve(small_skb, IPOIB_CM_RX_RESERVE);
 632                         ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
 633                                                    dlen, DMA_FROM_DEVICE);
 634                         skb_copy_from_linear_data(skb, small_skb->data, dlen);
 635                         ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
 636                                                       dlen, DMA_FROM_DEVICE);
 637                         skb_put(small_skb, dlen);
 638                         skb = small_skb;
 639                         goto copied;
 640                 }
 641         }
 642
 643         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
 644                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
 645
 646         newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
 647                                        mapping, GFP_ATOMIC);
 648         if (unlikely(!newskb)) {
 649                 /*
 650                  * If we can't allocate a new RX buffer, dump
 651                  * this packet and reuse the old buffer.
 652                  */
 653                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 654                 ++dev->stats.rx_dropped;
 655                 goto repost;
 656         }
 657
 658         ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
 659         memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
 660
 661         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 662                        wc->byte_len, wc->slid);
 663
 664         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 665
 666 copied:
 667         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 668         skb_add_pseudo_hdr(skb);
 669
 670         ++dev->stats.rx_packets;
 671         dev->stats.rx_bytes += skb->len;
 672
 673         skb->dev = dev;
 674         /* XXX get correct PACKET_ type here */
 675         skb->pkt_type = PACKET_HOST;
 676         netif_receive_skb(skb);
 677
 678 repost:
 679         if (has_srq) {
 680                 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
 681                         ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
 682                                    "for buf %d\n", wr_id);
 683         } else {
 684                 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
 685                                                           &priv->cm.rx_wr,
 686                                                           priv->cm.rx_sge,
 687                                                           wr_id))) {
 688                         --p->recv_count;
 689                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
 690                                    "for buf %d\n", wr_id);
 691                 }
 692         }
 693 }
 694
 695 static inline int post_send(struct ipoib_dev_priv *priv,
 696                             struct ipoib_cm_tx *tx,
 697                             unsigned int wr_id,
 698                             struct ipoib_tx_buf *tx_req)
 699 {
 700         struct ib_send_wr *bad_wr;
 701
 702         ipoib_build_sge(priv, tx_req);
 703
 704         priv->tx_wr.wr.wr_id    = wr_id | IPOIB_OP_CM;
 705
 706         return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
 707 }
 708
 709 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 710 {
 711         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 712         struct ipoib_tx_buf *tx_req;
 713         int rc;
 714         unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
 715
 716         if (unlikely(skb->len > tx->mtu)) {
 717                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 718                            skb->len, tx->mtu);
 719                 ++dev->stats.tx_dropped;
 720                 ++dev->stats.tx_errors;
 721                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 722                 return;
 723         }
 724         if (skb_shinfo(skb)->nr_frags > usable_sge) {
 725                 if (skb_linearize(skb) < 0) {
 726                         ipoib_warn(priv, "skb could not be linearized\n");
 727                         ++dev->stats.tx_dropped;
 728                         ++dev->stats.tx_errors;
 729                         dev_kfree_skb_any(skb);
 730                         return;
 731                 }
 732                 /* Does skb_linearize return ok without reducing nr_frags? */
 733                 if (skb_shinfo(skb)->nr_frags > usable_sge) {
 734                         ipoib_warn(priv, "too many frags after skb linearize\n");
 735                         ++dev->stats.tx_dropped;
 736                         ++dev->stats.tx_errors;
 737                         dev_kfree_skb_any(skb);
 738                         return;
 739                 }
 740         }
 741         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 742                        tx->tx_head, skb->len, tx->qp->qp_num);
 743
 744         /*
 745          * We put the skb into the tx_ring _before_ we call post_send()
 746          * because it's entirely possible that the completion handler will
 747          * run before we execute anything after the post_send().  That
 748          * means we have to make sure everything is properly recorded and
 749          * our state is consistent before we call post_send().
 750          */
 751         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 752         tx_req->skb = skb;
 753
 754         if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 755                 ++dev->stats.tx_errors;
 756                 dev_kfree_skb_any(skb);
 757                 return;
 758         }
 759
 760         skb_orphan(skb);
 761         skb_dst_drop(skb);
 762
 763         rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
 764         if (unlikely(rc)) {
 765                 ipoib_warn(priv, "post_send failed, error %d\n", rc);
 766                 ++dev->stats.tx_errors;
 767                 ipoib_dma_unmap_tx(priv, tx_req);
 768                 dev_kfree_skb_any(skb);
 769         } else {
 770                 netif_trans_update(dev);
 771                 ++tx->tx_head;
 772
 773                 if (++priv->tx_outstanding == ipoib_sendq_size) {
 774                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 775                                   tx->qp->qp_num);
 776                         netif_stop_queue(dev);
 777                         rc = ib_req_notify_cq(priv->send_cq,
 778                                 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
 779                         if (rc < 0)
 780                                 ipoib_warn(priv, "request notify on send CQ failed\n");
 781                         else if (rc)
 782                                 ipoib_send_comp_handler(priv->send_cq, dev);
 783                 }
 784         }
 785 }
 786
 787 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 788 {
 789         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 790         struct ipoib_cm_tx *tx = wc->qp->qp_context;
 791         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 792         struct ipoib_tx_buf *tx_req;
 793         unsigned long flags;
 794
 795         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 796                        wr_id, wc->status);
 797
 798         if (unlikely(wr_id >= ipoib_sendq_size)) {
 799                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 800                            wr_id, ipoib_sendq_size);
 801                 return;
 802         }
 803
 804         tx_req = &tx->tx_ring[wr_id];
 805
 806         ipoib_dma_unmap_tx(priv, tx_req);
 807
 808         /* FIXME: is this right? Shouldn't we only increment on success? */
 809         ++dev->stats.tx_packets;
 810         dev->stats.tx_bytes += tx_req->skb->len;
 811
 812         dev_kfree_skb_any(tx_req->skb);
 813
 814         netif_tx_lock(dev);
 815
 816         ++tx->tx_tail;
 817         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
 818             netif_queue_stopped(dev) &&
 819             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 820                 netif_wake_queue(dev);
 821
 822         if (wc->status != IB_WC_SUCCESS &&
 823             wc->status != IB_WC_WR_FLUSH_ERR) {
 824                 struct ipoib_neigh *neigh;
 825
 826                 /* IB_WC[_RNR]_RETRY_EXC_ERR error is part of the life cycle,
 827                  * so don't make waves.
 828                  */
 829                 if (wc->status == IB_WC_RNR_RETRY_EXC_ERR ||
 830                     wc->status == IB_WC_RETRY_EXC_ERR)
 831                         ipoib_dbg(priv,
 832                                   "%s: failed cm send event (status=%d, wrid=%d vend_err 0x%x)\n",
 833                                    __func__, wc->status, wr_id, wc->vendor_err);
 834                 else
 835                         ipoib_warn(priv,
 836                                     "%s: failed cm send event (status=%d, wrid=%d vend_err 0x%x)\n",
 837                                    __func__, wc->status, wr_id, wc->vendor_err);
 838
 839                 spin_lock_irqsave(&priv->lock, flags);
 840                 neigh = tx->neigh;
 841
 842                 if (neigh) {
 843                         neigh->cm = NULL;
 844                         ipoib_neigh_free(neigh);
 845
 846                         tx->neigh = NULL;
 847                 }
 848
 849                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 850                         list_move(&tx->list, &priv->cm.reap_list);
 851                         queue_work(priv->wq, &priv->cm.reap_task);
 852                 }
 853
 854                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 855
 856                 spin_unlock_irqrestore(&priv->lock, flags);
 857         }
 858
 859         netif_tx_unlock(dev);
 860 }
 861
 862 int ipoib_cm_dev_open(struct net_device *dev)
 863 {
 864         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 865         int ret;
 866
 867         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 868                 return 0;
 869
 870         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 871         if (IS_ERR(priv->cm.id)) {
 872                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 873                 ret = PTR_ERR(priv->cm.id);
 874                 goto err_cm;
 875         }
 876
 877         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 878                            0);
 879         if (ret) {
 880                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 881                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 882                 goto err_listen;
 883         }
 884
 885         return 0;
 886
 887 err_listen:
 888         ib_destroy_cm_id(priv->cm.id);
 889 err_cm:
 890         priv->cm.id = NULL;
 891         return ret;
 892 }
 893
 894 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
 895 {
 896         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 897         struct ipoib_cm_rx *rx, *n;
 898         LIST_HEAD(list);
 899
 900         spin_lock_irq(&priv->lock);
 901         list_splice_init(&priv->cm.rx_reap_list, &list);
 902         spin_unlock_irq(&priv->lock);
 903
 904         list_for_each_entry_safe(rx, n, &list, list) {
 905                 ib_destroy_cm_id(rx->id);
 906                 ib_destroy_qp(rx->qp);
 907                 if (!ipoib_cm_has_srq(dev)) {
 908                         ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
 909                         spin_lock_irq(&priv->lock);
 910                         --priv->cm.nonsrq_conn_qp;
 911                         spin_unlock_irq(&priv->lock);
 912                 }
 913                 kfree(rx);
 914         }
 915 }
 916
 917 void ipoib_cm_dev_stop(struct net_device *dev)
 918 {
 919         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 920         struct ipoib_cm_rx *p;
 921         unsigned long begin;
 922         int ret;
 923
 924         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 925                 return;
 926
 927         ib_destroy_cm_id(priv->cm.id);
 928         priv->cm.id = NULL;
 929
 930         spin_lock_irq(&priv->lock);
 931         while (!list_empty(&priv->cm.passive_ids)) {
 932                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 933                 list_move(&p->list, &priv->cm.rx_error_list);
 934                 p->state = IPOIB_CM_RX_ERROR;
 935                 spin_unlock_irq(&priv->lock);
 936                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 937                 if (ret)
 938                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 939                 spin_lock_irq(&priv->lock);
 940         }
 941
 942         /* Wait for all RX to be drained */
 943         begin = jiffies;
 944
 945         while (!list_empty(&priv->cm.rx_error_list) ||
 946                !list_empty(&priv->cm.rx_flush_list) ||
 947                !list_empty(&priv->cm.rx_drain_list)) {
 948                 if (time_after(jiffies, begin + 5 * HZ)) {
 949                         ipoib_warn(priv, "RX drain timing out\n");
 950
 951                         /*
 952                          * assume the HW is wedged and just free up everything.
 953                          */
 954                         list_splice_init(&priv->cm.rx_flush_list,
 955                                          &priv->cm.rx_reap_list);
 956                         list_splice_init(&priv->cm.rx_error_list,
 957                                          &priv->cm.rx_reap_list);
 958                         list_splice_init(&priv->cm.rx_drain_list,
 959                                          &priv->cm.rx_reap_list);
 960                         break;
 961                 }
 962                 spin_unlock_irq(&priv->lock);
 963                 usleep_range(1000, 2000);
 964                 ipoib_drain_cq(dev);
 965                 spin_lock_irq(&priv->lock);
 966         }
 967
 968         spin_unlock_irq(&priv->lock);
 969
 970         ipoib_cm_free_rx_reap_list(dev);
 971
 972         cancel_delayed_work(&priv->cm.stale_task);
 973 }
 974
 975 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 976 {
 977         struct ipoib_cm_tx *p = cm_id->context;
 978         struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
 979         struct ipoib_cm_data *data = event->private_data;
 980         struct sk_buff_head skqueue;
 981         struct ib_qp_attr qp_attr;
 982         int qp_attr_mask, ret;
 983         struct sk_buff *skb;
 984
 985         p->mtu = be32_to_cpu(data->mtu);
 986
 987         if (p->mtu <= IPOIB_ENCAP_LEN) {
 988                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 989                            p->mtu, IPOIB_ENCAP_LEN);
 990                 return -EINVAL;
 991         }
 992
 993         qp_attr.qp_state = IB_QPS_RTR;
 994         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 995         if (ret) {
 996                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 997                 return ret;
 998         }
 999
1000         qp_attr.rq_psn = 0 /* FIXME */;
1001         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1002         if (ret) {
1003                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
1004                 return ret;
1005         }
1006
1007         qp_attr.qp_state = IB_QPS_RTS;
1008         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1009         if (ret) {
1010                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1011                 return ret;
1012         }
1013         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1014         if (ret) {
1015                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1016                 return ret;
1017         }
1018
1019         skb_queue_head_init(&skqueue);
1020
1021         netif_tx_lock_bh(p->dev);
1022         spin_lock_irq(&priv->lock);
1023         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1024         if (p->neigh)
1025                 while ((skb = __skb_dequeue(&p->neigh->queue)))
1026                         __skb_queue_tail(&skqueue, skb);
1027         spin_unlock_irq(&priv->lock);
1028         netif_tx_unlock_bh(p->dev);
1029
1030         while ((skb = __skb_dequeue(&skqueue))) {
1031                 skb->dev = p->dev;
1032                 ret = dev_queue_xmit(skb);
1033                 if (ret)
1034                         ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1035                                    __func__, ret);
1036         }
1037
1038         ret = ib_send_cm_rtu(cm_id, NULL, 0);
1039         if (ret) {
1040                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1041                 return ret;
1042         }
1043         return 0;
1044 }
1045
1046 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1047 {
1048         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1049         struct ib_qp_init_attr attr = {
1050                 .send_cq                = priv->recv_cq,
1051                 .recv_cq                = priv->recv_cq,
1052                 .srq                    = priv->cm.srq,
1053                 .cap.max_send_wr        = ipoib_sendq_size,
1054                 .cap.max_send_sge       = 1,
1055                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
1056                 .qp_type                = IB_QPT_RC,
1057                 .qp_context             = tx,
1058                 .create_flags           = 0
1059         };
1060         struct ib_qp *tx_qp;
1061
1062         if (dev->features & NETIF_F_SG)
1063                 attr.cap.max_send_sge =
1064                         min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1065
1066         tx_qp = ib_create_qp(priv->pd, &attr);
1067         tx->max_send_sge = attr.cap.max_send_sge;
1068         return tx_qp;
1069 }
1070
1071 static int ipoib_cm_send_req(struct net_device *dev,
1072                              struct ib_cm_id *id, struct ib_qp *qp,
1073                              u32 qpn,
1074                              struct sa_path_rec *pathrec)
1075 {
1076         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1077         struct ipoib_cm_data data = {};
1078         struct ib_cm_req_param req = {};
1079
1080         data.qpn = cpu_to_be32(priv->qp->qp_num);
1081         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1082
1083         req.primary_path                = pathrec;
1084         req.alternate_path              = NULL;
1085         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1086         req.qp_num                      = qp->qp_num;
1087         req.qp_type                     = qp->qp_type;
1088         req.private_data                = &data;
1089         req.private_data_len            = sizeof data;
1090         req.flow_control                = 0;
1091
1092         req.starting_psn                = 0; /* FIXME */
1093
1094         /*
1095          * Pick some arbitrary defaults here; we could make these
1096          * module parameters if anyone cared about setting them.
1097          */
1098         req.responder_resources         = 4;
1099         req.remote_cm_response_timeout  = 20;
1100         req.local_cm_response_timeout   = 20;
1101         req.retry_count                 = 0; /* RFC draft warns against retries */
1102         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
1103         req.max_cm_retries              = 15;
1104         req.srq                         = ipoib_cm_has_srq(dev);
1105         return ib_send_cm_req(id, &req);
1106 }
1107
1108 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1109                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
1110 {
1111         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1112         struct ib_qp_attr qp_attr;
1113         int qp_attr_mask, ret;
1114         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1115         if (ret) {
1116                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1117                 return ret;
1118         }
1119
1120         qp_attr.qp_state = IB_QPS_INIT;
1121         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1122         qp_attr.port_num = priv->port;
1123         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1124
1125         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1126         if (ret) {
1127                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1128                 return ret;
1129         }
1130         return 0;
1131 }
1132
1133 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1134                             struct sa_path_rec *pathrec)
1135 {
1136         struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1137         unsigned int noio_flag;
1138         int ret;
1139
1140         noio_flag = memalloc_noio_save();
1141         p->tx_ring = vzalloc(ipoib_sendq_size * sizeof(*p->tx_ring));
1142         if (!p->tx_ring) {
1143                 ret = -ENOMEM;
1144                 goto err_tx;
1145         }
1146         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1147
1148         p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1149         memalloc_noio_restore(noio_flag);
1150         if (IS_ERR(p->qp)) {
1151                 ret = PTR_ERR(p->qp);
1152                 ipoib_warn(priv, "failed to create tx qp: %d\n", ret);
1153                 goto err_qp;
1154         }
1155
1156         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1157         if (IS_ERR(p->id)) {
1158                 ret = PTR_ERR(p->id);
1159                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1160                 goto err_id;
1161         }
1162
1163         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
1164         if (ret) {
1165                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1166                 goto err_modify_send;
1167         }
1168
1169         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1170         if (ret) {
1171                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1172                 goto err_modify_send;
1173         }
1174
1175         ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1176                   p->qp->qp_num, pathrec->dgid.raw, qpn);
1177
1178         return 0;
1179
1180 err_modify_send:
1181         ib_destroy_cm_id(p->id);
1182 err_id:
1183         p->id = NULL;
1184         ib_destroy_qp(p->qp);
1185 err_qp:
1186         p->qp = NULL;
1187         vfree(p->tx_ring);
1188 err_tx:
1189         return ret;
1190 }
1191
1192 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1193 {
1194         struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1195         struct ipoib_tx_buf *tx_req;
1196         unsigned long begin;
1197
1198         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1199                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1200
1201         if (p->id)
1202                 ib_destroy_cm_id(p->id);
1203
1204         if (p->tx_ring) {
1205                 /* Wait for all sends to complete */
1206                 begin = jiffies;
1207                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1208                         if (time_after(jiffies, begin + 5 * HZ)) {
1209                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1210                                            p->tx_head - p->tx_tail);
1211                                 goto timeout;
1212                         }
1213
1214                         usleep_range(1000, 2000);
1215                 }
1216         }
1217
1218 timeout:
1219
1220         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1221                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1222                 ipoib_dma_unmap_tx(priv, tx_req);
1223                 dev_kfree_skb_any(tx_req->skb);
1224                 ++p->tx_tail;
1225                 netif_tx_lock_bh(p->dev);
1226                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1227                     netif_queue_stopped(p->dev) &&
1228                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1229                         netif_wake_queue(p->dev);
1230                 netif_tx_unlock_bh(p->dev);
1231         }
1232
1233         if (p->qp)
1234                 ib_destroy_qp(p->qp);
1235
1236         vfree(p->tx_ring);
1237         kfree(p);
1238 }
1239
1240 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1241                                struct ib_cm_event *event)
1242 {
1243         struct ipoib_cm_tx *tx = cm_id->context;
1244         struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1245         struct net_device *dev = priv->dev;
1246         struct ipoib_neigh *neigh;
1247         unsigned long flags;
1248         int ret;
1249
1250         switch (event->event) {
1251         case IB_CM_DREQ_RECEIVED:
1252                 ipoib_dbg(priv, "DREQ received.\n");
1253                 ib_send_cm_drep(cm_id, NULL, 0);
1254                 break;
1255         case IB_CM_REP_RECEIVED:
1256                 ipoib_dbg(priv, "REP received.\n");
1257                 ret = ipoib_cm_rep_handler(cm_id, event);
1258                 if (ret)
1259                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1260                                        NULL, 0, NULL, 0);
1261                 break;
1262         case IB_CM_REQ_ERROR:
1263         case IB_CM_REJ_RECEIVED:
1264         case IB_CM_TIMEWAIT_EXIT:
1265                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1266                 netif_tx_lock_bh(dev);
1267                 spin_lock_irqsave(&priv->lock, flags);
1268                 neigh = tx->neigh;
1269
1270                 if (neigh) {
1271                         neigh->cm = NULL;
1272                         ipoib_neigh_free(neigh);
1273
1274                         tx->neigh = NULL;
1275                 }
1276
1277                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1278                         list_move(&tx->list, &priv->cm.reap_list);
1279                         queue_work(priv->wq, &priv->cm.reap_task);
1280                 }
1281
1282                 spin_unlock_irqrestore(&priv->lock, flags);
1283                 netif_tx_unlock_bh(dev);
1284                 break;
1285         default:
1286                 break;
1287         }
1288
1289         return 0;
1290 }
1291
1292 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1293                                        struct ipoib_neigh *neigh)
1294 {
1295         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1296         struct ipoib_cm_tx *tx;
1297
1298         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1299         if (!tx)
1300                 return NULL;
1301
1302         neigh->cm = tx;
1303         tx->neigh = neigh;
1304         tx->path = path;
1305         tx->dev = dev;
1306         list_add(&tx->list, &priv->cm.start_list);
1307         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1308         queue_work(priv->wq, &priv->cm.start_task);
1309         return tx;
1310 }
1311
1312 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1313 {
1314         struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1315         unsigned long flags;
1316         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1317                 spin_lock_irqsave(&priv->lock, flags);
1318                 list_move(&tx->list, &priv->cm.reap_list);
1319                 queue_work(priv->wq, &priv->cm.reap_task);
1320                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1321                           tx->neigh->daddr + 4);
1322                 tx->neigh = NULL;
1323                 spin_unlock_irqrestore(&priv->lock, flags);
1324         }
1325 }
1326
1327 #define QPN_AND_OPTIONS_OFFSET  4
1328
1329 static void ipoib_cm_tx_start(struct work_struct *work)
1330 {
1331         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1332                                                    cm.start_task);
1333         struct net_device *dev = priv->dev;
1334         struct ipoib_neigh *neigh;
1335         struct ipoib_cm_tx *p;
1336         unsigned long flags;
1337         struct ipoib_path *path;
1338         int ret;
1339
1340         struct sa_path_rec pathrec;
1341         u32 qpn;
1342
1343         netif_tx_lock_bh(dev);
1344         spin_lock_irqsave(&priv->lock, flags);
1345
1346         while (!list_empty(&priv->cm.start_list)) {
1347                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1348                 list_del_init(&p->list);
1349                 neigh = p->neigh;
1350
1351                 qpn = IPOIB_QPN(neigh->daddr);
1352                 /*
1353                  * As long as the search is with these 2 locks,
1354                  * path existence indicates its validity.
1355                  */
1356                 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1357                 if (!path) {
1358                         pr_info("%s ignore not valid path %pI6\n",
1359                                 __func__,
1360                                 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1361                         goto free_neigh;
1362                 }
1363                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1364
1365                 spin_unlock_irqrestore(&priv->lock, flags);
1366                 netif_tx_unlock_bh(dev);
1367
1368                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1369
1370                 netif_tx_lock_bh(dev);
1371                 spin_lock_irqsave(&priv->lock, flags);
1372
1373                 if (ret) {
1374 free_neigh:
1375                         neigh = p->neigh;
1376                         if (neigh) {
1377                                 neigh->cm = NULL;
1378                                 ipoib_neigh_free(neigh);
1379                         }
1380                         list_del(&p->list);
1381                         kfree(p);
1382                 }
1383         }
1384
1385         spin_unlock_irqrestore(&priv->lock, flags);
1386         netif_tx_unlock_bh(dev);
1387 }
1388
1389 static void ipoib_cm_tx_reap(struct work_struct *work)
1390 {
1391         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1392                                                    cm.reap_task);
1393         struct net_device *dev = priv->dev;
1394         struct ipoib_cm_tx *p;
1395         unsigned long flags;
1396
1397         netif_tx_lock_bh(dev);
1398         spin_lock_irqsave(&priv->lock, flags);
1399
1400         while (!list_empty(&priv->cm.reap_list)) {
1401                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1402                 list_del_init(&p->list);
1403                 spin_unlock_irqrestore(&priv->lock, flags);
1404                 netif_tx_unlock_bh(dev);
1405                 ipoib_cm_tx_destroy(p);
1406                 netif_tx_lock_bh(dev);
1407                 spin_lock_irqsave(&priv->lock, flags);
1408         }
1409
1410         spin_unlock_irqrestore(&priv->lock, flags);
1411         netif_tx_unlock_bh(dev);
1412 }
1413
1414 static void ipoib_cm_skb_reap(struct work_struct *work)
1415 {
1416         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1417                                                    cm.skb_task);
1418         struct net_device *dev = priv->dev;
1419         struct sk_buff *skb;
1420         unsigned long flags;
1421         unsigned mtu = priv->mcast_mtu;
1422
1423         netif_tx_lock_bh(dev);
1424         spin_lock_irqsave(&priv->lock, flags);
1425
1426         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1427                 spin_unlock_irqrestore(&priv->lock, flags);
1428                 netif_tx_unlock_bh(dev);
1429
1430                 if (skb->protocol == htons(ETH_P_IP)) {
1431                         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
1432                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1433                 }
1434 #if IS_ENABLED(CONFIG_IPV6)
1435                 else if (skb->protocol == htons(ETH_P_IPV6)) {
1436                         memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
1437                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1438                 }
1439 #endif
1440                 dev_kfree_skb_any(skb);
1441
1442                 netif_tx_lock_bh(dev);
1443                 spin_lock_irqsave(&priv->lock, flags);
1444         }
1445
1446         spin_unlock_irqrestore(&priv->lock, flags);
1447         netif_tx_unlock_bh(dev);
1448 }
1449
1450 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1451                            unsigned int mtu)
1452 {
1453         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1454         int e = skb_queue_empty(&priv->cm.skb_queue);
1455
1456         skb_dst_update_pmtu(skb, mtu);
1457
1458         skb_queue_tail(&priv->cm.skb_queue, skb);
1459         if (e)
1460                 queue_work(priv->wq, &priv->cm.skb_task);
1461 }
1462
1463 static void ipoib_cm_rx_reap(struct work_struct *work)
1464 {
1465         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1466                                                 cm.rx_reap_task)->dev);
1467 }
1468
1469 static void ipoib_cm_stale_task(struct work_struct *work)
1470 {
1471         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1472                                                    cm.stale_task.work);
1473         struct ipoib_cm_rx *p;
1474         int ret;
1475
1476         spin_lock_irq(&priv->lock);
1477         while (!list_empty(&priv->cm.passive_ids)) {
1478                 /* List is sorted by LRU, start from tail,
1479                  * stop when we see a recently used entry */
1480                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1481                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1482                         break;
1483                 list_move(&p->list, &priv->cm.rx_error_list);
1484                 p->state = IPOIB_CM_RX_ERROR;
1485                 spin_unlock_irq(&priv->lock);
1486                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1487                 if (ret)
1488                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1489                 spin_lock_irq(&priv->lock);
1490         }
1491
1492         if (!list_empty(&priv->cm.passive_ids))
1493                 queue_delayed_work(priv->wq,
1494                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1495         spin_unlock_irq(&priv->lock);
1496 }
1497
1498 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1499                          char *buf)
1500 {
1501         struct net_device *dev = to_net_dev(d);
1502         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1503
1504         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1505                 return sprintf(buf, "connected\n");
1506         else
1507                 return sprintf(buf, "datagram\n");
1508 }
1509
1510 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1511                         const char *buf, size_t count)
1512 {
1513         struct net_device *dev = to_net_dev(d);
1514         int ret;
1515         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1516
1517         if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1518                 return -EPERM;
1519
1520         if (!mutex_trylock(&priv->sysfs_mutex))
1521                 return restart_syscall();
1522
1523         if (!rtnl_trylock()) {
1524                 mutex_unlock(&priv->sysfs_mutex);
1525                 return restart_syscall();
1526         }
1527
1528         ret = ipoib_set_mode(dev, buf);
1529
1530         /* The assumption is that the function ipoib_set_mode returned
1531          * with the rtnl held by it, if not the value -EBUSY returned,
1532          * then no need to rtnl_unlock
1533          */
1534         if (ret != -EBUSY)
1535                 rtnl_unlock();
1536         mutex_unlock(&priv->sysfs_mutex);
1537
1538         return (!ret || ret == -EBUSY) ? count : ret;
1539 }
1540
1541 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1542
1543 int ipoib_cm_add_mode_attr(struct net_device *dev)
1544 {
1545         return device_create_file(&dev->dev, &dev_attr_mode);
1546 }
1547
1548 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1549 {
1550         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1551         struct ib_srq_init_attr srq_init_attr = {
1552                 .srq_type = IB_SRQT_BASIC,
1553                 .attr = {
1554                         .max_wr  = ipoib_recvq_size,
1555                         .max_sge = max_sge
1556                 }
1557         };
1558
1559         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1560         if (IS_ERR(priv->cm.srq)) {
1561                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1562                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1563                                priv->ca->name, PTR_ERR(priv->cm.srq));
1564                 priv->cm.srq = NULL;
1565                 return;
1566         }
1567
1568         priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1569         if (!priv->cm.srq_ring) {
1570                 ib_destroy_srq(priv->cm.srq);
1571                 priv->cm.srq = NULL;
1572                 return;
1573         }
1574
1575 }
1576
1577 int ipoib_cm_dev_init(struct net_device *dev)
1578 {
1579         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1580         int max_srq_sge, i;
1581
1582         INIT_LIST_HEAD(&priv->cm.passive_ids);
1583         INIT_LIST_HEAD(&priv->cm.reap_list);
1584         INIT_LIST_HEAD(&priv->cm.start_list);
1585         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1586         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1587         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1588         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1589         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1590         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1591         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1592         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1593         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1594
1595         skb_queue_head_init(&priv->cm.skb_queue);
1596
1597         ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1598
1599         max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1600         ipoib_cm_create_srq(dev, max_srq_sge);
1601         if (ipoib_cm_has_srq(dev)) {
1602                 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1603                 priv->cm.num_frags  = max_srq_sge;
1604                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1605                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1606         } else {
1607                 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1608                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1609         }
1610
1611         ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1612
1613         if (ipoib_cm_has_srq(dev)) {
1614                 for (i = 0; i < ipoib_recvq_size; ++i) {
1615                         if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1616                                                    priv->cm.num_frags - 1,
1617                                                    priv->cm.srq_ring[i].mapping,
1618                                                    GFP_KERNEL)) {
1619                                 ipoib_warn(priv, "failed to allocate "
1620                                            "receive buffer %d\n", i);
1621                                 ipoib_cm_dev_cleanup(dev);
1622                                 return -ENOMEM;
1623                         }
1624
1625                         if (ipoib_cm_post_receive_srq(dev, i)) {
1626                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1627                                            "failed for buf %d\n", i);
1628                                 ipoib_cm_dev_cleanup(dev);
1629                                 return -EIO;
1630                         }
1631                 }
1632         }
1633
1634         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1635         return 0;
1636 }
1637
1638 void ipoib_cm_dev_cleanup(struct net_device *dev)
1639 {
1640         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1641         int ret;
1642
1643         if (!priv->cm.srq)
1644                 return;
1645
1646         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1647
1648         ret = ib_destroy_srq(priv->cm.srq);
1649         if (ret)
1650                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1651
1652         priv->cm.srq = NULL;
1653         if (!priv->cm.srq_ring)
1654                 return;
1655
1656         ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1657         priv->cm.srq_ring = NULL;
1658 }