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
  43 #include "ipoib.h"
  44
  45 int ipoib_max_conn_qp = 128;
  46
  47 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
  48 MODULE_PARM_DESC(max_nonsrq_conn_qp,
  49                  "Max number of connected-mode QPs per interface "
  50                  "(applied only if shared receive queue is not available)");
  51
  52 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  53 static int data_debug_level;
  54
  55 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  56 MODULE_PARM_DESC(cm_data_debug_level,
  57                  "Enable data path debug tracing for connected mode if > 0");
  58 #endif
  59
  60 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
  61
  62 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
  63 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
  64 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
  65 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
  66
  67 #define IPOIB_CM_RX_RESERVE     (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
  68
  69 static struct ib_qp_attr ipoib_cm_err_attr = {
  70         .qp_state = IB_QPS_ERR
  71 };
  72
  73 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
  74
  75 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  76         .opcode = IB_WR_SEND,
  77 };
  78
  79 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  80                                struct ib_cm_event *event);
  81
  82 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
  83                                   u64 mapping[IPOIB_CM_RX_SG])
  84 {
  85         int i;
  86
  87         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
  88
  89         for (i = 0; i < frags; ++i)
  90                 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
  91 }
  92
  93 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
  94 {
  95         struct ipoib_dev_priv *priv = ipoib_priv(dev);
  96         struct ib_recv_wr *bad_wr;
  97         int i, ret;
  98
  99         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 100
 101         for (i = 0; i < priv->cm.num_frags; ++i)
 102                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
 103
 104         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
 105         if (unlikely(ret)) {
 106                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
 107                 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
 108                                       priv->cm.srq_ring[id].mapping);
 109                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
 110                 priv->cm.srq_ring[id].skb = NULL;
 111         }
 112
 113         return ret;
 114 }
 115
 116 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
 117                                         struct ipoib_cm_rx *rx,
 118                                         struct ib_recv_wr *wr,
 119                                         struct ib_sge *sge, int id)
 120 {
 121         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 122         struct ib_recv_wr *bad_wr;
 123         int i, ret;
 124
 125         wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 126
 127         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
 128                 sge[i].addr = rx->rx_ring[id].mapping[i];
 129
 130         ret = ib_post_recv(rx->qp, wr, &bad_wr);
 131         if (unlikely(ret)) {
 132                 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
 133                 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 134                                       rx->rx_ring[id].mapping);
 135                 dev_kfree_skb_any(rx->rx_ring[id].skb);
 136                 rx->rx_ring[id].skb = NULL;
 137         }
 138
 139         return ret;
 140 }
 141
 142 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
 143                                              struct ipoib_cm_rx_buf *rx_ring,
 144                                              int id, int frags,
 145                                              u64 mapping[IPOIB_CM_RX_SG],
 146                                              gfp_t gfp)
 147 {
 148         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 149         struct sk_buff *skb;
 150         int i;
 151
 152         skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
 153         if (unlikely(!skb))
 154                 return NULL;
 155
 156         /*
 157          * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
 158          * IP header to a multiple of 16.
 159          */
 160         skb_reserve(skb, IPOIB_CM_RX_RESERVE);
 161
 162         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 163                                        DMA_FROM_DEVICE);
 164         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 165                 dev_kfree_skb_any(skb);
 166                 return NULL;
 167         }
 168
 169         for (i = 0; i < frags; i++) {
 170                 struct page *page = alloc_page(gfp);
 171
 172                 if (!page)
 173                         goto partial_error;
 174                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 175
 176                 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
 177                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
 178                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 179                         goto partial_error;
 180         }
 181
 182         rx_ring[id].skb = skb;
 183         return skb;
 184
 185 partial_error:
 186
 187         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 188
 189         for (; i > 0; --i)
 190                 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
 191
 192         dev_kfree_skb_any(skb);
 193         return NULL;
 194 }
 195
 196 static void ipoib_cm_free_rx_ring(struct net_device *dev,
 197                                   struct ipoib_cm_rx_buf *rx_ring)
 198 {
 199         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 200         int i;
 201
 202         for (i = 0; i < ipoib_recvq_size; ++i)
 203                 if (rx_ring[i].skb) {
 204                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 205                                               rx_ring[i].mapping);
 206                         dev_kfree_skb_any(rx_ring[i].skb);
 207                 }
 208
 209         vfree(rx_ring);
 210 }
 211
 212 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 213 {
 214         struct ib_send_wr *bad_wr;
 215         struct ipoib_cm_rx *p;
 216
 217         /* We only reserved 1 extra slot in CQ for drain WRs, so
 218          * make sure we have at most 1 outstanding WR. */
 219         if (list_empty(&priv->cm.rx_flush_list) ||
 220             !list_empty(&priv->cm.rx_drain_list))
 221                 return;
 222
 223         /*
 224          * QPs on flush list are error state.  This way, a "flush
 225          * error" WC will be immediately generated for each WR we post.
 226          */
 227         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 228         ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
 229         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
 230                 ipoib_warn(priv, "failed to post drain wr\n");
 231
 232         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 233 }
 234
 235 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 236 {
 237         struct ipoib_cm_rx *p = ctx;
 238         struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
 239         unsigned long flags;
 240
 241         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 242                 return;
 243
 244         spin_lock_irqsave(&priv->lock, flags);
 245         list_move(&p->list, &priv->cm.rx_flush_list);
 246         p->state = IPOIB_CM_RX_FLUSH;
 247         ipoib_cm_start_rx_drain(priv);
 248         spin_unlock_irqrestore(&priv->lock, flags);
 249 }
 250
 251 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 252                                            struct ipoib_cm_rx *p)
 253 {
 254         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 255         struct ib_qp_init_attr attr = {
 256                 .event_handler = ipoib_cm_rx_event_handler,
 257                 .send_cq = priv->recv_cq, /* For drain WR */
 258                 .recv_cq = priv->recv_cq,
 259                 .srq = priv->cm.srq,
 260                 .cap.max_send_wr = 1, /* For drain WR */
 261                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 262                 .sq_sig_type = IB_SIGNAL_ALL_WR,
 263                 .qp_type = IB_QPT_RC,
 264                 .qp_context = p,
 265         };
 266
 267         if (!ipoib_cm_has_srq(dev)) {
 268                 attr.cap.max_recv_wr  = ipoib_recvq_size;
 269                 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
 270         }
 271
 272         return ib_create_qp(priv->pd, &attr);
 273 }
 274
 275 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 276                                  struct ib_cm_id *cm_id, struct ib_qp *qp,
 277                                  unsigned psn)
 278 {
 279         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 280         struct ib_qp_attr qp_attr;
 281         int qp_attr_mask, ret;
 282
 283         qp_attr.qp_state = IB_QPS_INIT;
 284         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 285         if (ret) {
 286                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 287                 return ret;
 288         }
 289         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 290         if (ret) {
 291                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 292                 return ret;
 293         }
 294         qp_attr.qp_state = IB_QPS_RTR;
 295         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 296         if (ret) {
 297                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 298                 return ret;
 299         }
 300         qp_attr.rq_psn = psn;
 301         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 302         if (ret) {
 303                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 304                 return ret;
 305         }
 306
 307         /*
 308          * Current Mellanox HCA firmware won't generate completions
 309          * with error for drain WRs unless the QP has been moved to
 310          * RTS first. This work-around leaves a window where a QP has
 311          * moved to error asynchronously, but this will eventually get
 312          * fixed in firmware, so let's not error out if modify QP
 313          * fails.
 314          */
 315         qp_attr.qp_state = IB_QPS_RTS;
 316         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 317         if (ret) {
 318                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 319                 return 0;
 320         }
 321         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 322         if (ret) {
 323                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 324                 return 0;
 325         }
 326
 327         return 0;
 328 }
 329
 330 static void ipoib_cm_init_rx_wr(struct net_device *dev,
 331                                 struct ib_recv_wr *wr,
 332                                 struct ib_sge *sge)
 333 {
 334         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 335         int i;
 336
 337         for (i = 0; i < priv->cm.num_frags; ++i)
 338                 sge[i].lkey = priv->pd->local_dma_lkey;
 339
 340         sge[0].length = IPOIB_CM_HEAD_SIZE;
 341         for (i = 1; i < priv->cm.num_frags; ++i)
 342                 sge[i].length = PAGE_SIZE;
 343
 344         wr->next    = NULL;
 345         wr->sg_list = sge;
 346         wr->num_sge = priv->cm.num_frags;
 347 }
 348
 349 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
 350                                    struct ipoib_cm_rx *rx)
 351 {
 352         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 353         struct {
 354                 struct ib_recv_wr wr;
 355                 struct ib_sge sge[IPOIB_CM_RX_SG];
 356         } *t;
 357         int ret;
 358         int i;
 359
 360         rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
 361         if (!rx->rx_ring)
 362                 return -ENOMEM;
 363
 364         t = kmalloc(sizeof *t, GFP_KERNEL);
 365         if (!t) {
 366                 ret = -ENOMEM;
 367                 goto err_free_1;
 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
 415 err_free_1:
 416         ipoib_cm_free_rx_ring(dev, rx->rx_ring);
 417
 418         return ret;
 419 }
 420
 421 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 422                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
 423                              unsigned psn)
 424 {
 425         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 426         struct ipoib_cm_data data = {};
 427         struct ib_cm_rep_param rep = {};
 428
 429         data.qpn = cpu_to_be32(priv->qp->qp_num);
 430         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
 431
 432         rep.private_data = &data;
 433         rep.private_data_len = sizeof data;
 434         rep.flow_control = 0;
 435         rep.rnr_retry_count = req->rnr_retry_count;
 436         rep.srq = ipoib_cm_has_srq(dev);
 437         rep.qp_num = qp->qp_num;
 438         rep.starting_psn = psn;
 439         return ib_send_cm_rep(cm_id, &rep);
 440 }
 441
 442 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 443 {
 444         struct net_device *dev = cm_id->context;
 445         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 446         struct ipoib_cm_rx *p;
 447         unsigned psn;
 448         int ret;
 449
 450         ipoib_dbg(priv, "REQ arrived\n");
 451         p = kzalloc(sizeof *p, GFP_KERNEL);
 452         if (!p)
 453                 return -ENOMEM;
 454         p->dev = dev;
 455         p->id = cm_id;
 456         cm_id->context = p;
 457         p->state = IPOIB_CM_RX_LIVE;
 458         p->jiffies = jiffies;
 459         INIT_LIST_HEAD(&p->list);
 460
 461         p->qp = ipoib_cm_create_rx_qp(dev, p);
 462         if (IS_ERR(p->qp)) {
 463                 ret = PTR_ERR(p->qp);
 464                 goto err_qp;
 465         }
 466
 467         psn = prandom_u32() & 0xffffff;
 468         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
 469         if (ret)
 470                 goto err_modify;
 471
 472         if (!ipoib_cm_has_srq(dev)) {
 473                 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
 474                 if (ret)
 475                         goto err_modify;
 476         }
 477
 478         spin_lock_irq(&priv->lock);
 479         queue_delayed_work(priv->wq,
 480                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
 481         /* Add this entry to passive ids list head, but do not re-add it
 482          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
 483         p->jiffies = jiffies;
 484         if (p->state == IPOIB_CM_RX_LIVE)
 485                 list_move(&p->list, &priv->cm.passive_ids);
 486         spin_unlock_irq(&priv->lock);
 487
 488         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
 489         if (ret) {
 490                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
 491                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
 492                         ipoib_warn(priv, "unable to move qp to error state\n");
 493         }
 494         return 0;
 495
 496 err_modify:
 497         ib_destroy_qp(p->qp);
 498 err_qp:
 499         kfree(p);
 500         return ret;
 501 }
 502
 503 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 504                                struct ib_cm_event *event)
 505 {
 506         struct ipoib_cm_rx *p;
 507         struct ipoib_dev_priv *priv;
 508
 509         switch (event->event) {
 510         case IB_CM_REQ_RECEIVED:
 511                 return ipoib_cm_req_handler(cm_id, event);
 512         case IB_CM_DREQ_RECEIVED:
 513                 p = cm_id->context;
 514                 ib_send_cm_drep(cm_id, NULL, 0);
 515                 /* Fall through */
 516         case IB_CM_REJ_RECEIVED:
 517                 p = cm_id->context;
 518                 priv = 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                 if (wc->status != IB_WC_RNR_RETRY_EXC_ERR)
 827                         ipoib_warn(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
 828                                    wc->status, wr_id, wc->vendor_err);
 829                 else
 830                         ipoib_dbg(priv, "failed cm send event (status=%d, wrid=%d vend_err %x)\n",
 831                                   wc->status, wr_id, wc->vendor_err);
 832
 833                 spin_lock_irqsave(&priv->lock, flags);
 834                 neigh = tx->neigh;
 835
 836                 if (neigh) {
 837                         neigh->cm = NULL;
 838                         ipoib_neigh_free(neigh);
 839
 840                         tx->neigh = NULL;
 841                 }
 842
 843                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 844                         list_move(&tx->list, &priv->cm.reap_list);
 845                         queue_work(priv->wq, &priv->cm.reap_task);
 846                 }
 847
 848                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 849
 850                 spin_unlock_irqrestore(&priv->lock, flags);
 851         }
 852
 853         netif_tx_unlock(dev);
 854 }
 855
 856 int ipoib_cm_dev_open(struct net_device *dev)
 857 {
 858         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 859         int ret;
 860
 861         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 862                 return 0;
 863
 864         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 865         if (IS_ERR(priv->cm.id)) {
 866                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
 867                 ret = PTR_ERR(priv->cm.id);
 868                 goto err_cm;
 869         }
 870
 871         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 872                            0);
 873         if (ret) {
 874                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 875                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 876                 goto err_listen;
 877         }
 878
 879         return 0;
 880
 881 err_listen:
 882         ib_destroy_cm_id(priv->cm.id);
 883 err_cm:
 884         priv->cm.id = NULL;
 885         return ret;
 886 }
 887
 888 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
 889 {
 890         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 891         struct ipoib_cm_rx *rx, *n;
 892         LIST_HEAD(list);
 893
 894         spin_lock_irq(&priv->lock);
 895         list_splice_init(&priv->cm.rx_reap_list, &list);
 896         spin_unlock_irq(&priv->lock);
 897
 898         list_for_each_entry_safe(rx, n, &list, list) {
 899                 ib_destroy_cm_id(rx->id);
 900                 ib_destroy_qp(rx->qp);
 901                 if (!ipoib_cm_has_srq(dev)) {
 902                         ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
 903                         spin_lock_irq(&priv->lock);
 904                         --priv->cm.nonsrq_conn_qp;
 905                         spin_unlock_irq(&priv->lock);
 906                 }
 907                 kfree(rx);
 908         }
 909 }
 910
 911 void ipoib_cm_dev_stop(struct net_device *dev)
 912 {
 913         struct ipoib_dev_priv *priv = ipoib_priv(dev);
 914         struct ipoib_cm_rx *p;
 915         unsigned long begin;
 916         int ret;
 917
 918         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 919                 return;
 920
 921         ib_destroy_cm_id(priv->cm.id);
 922         priv->cm.id = NULL;
 923
 924         spin_lock_irq(&priv->lock);
 925         while (!list_empty(&priv->cm.passive_ids)) {
 926                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 927                 list_move(&p->list, &priv->cm.rx_error_list);
 928                 p->state = IPOIB_CM_RX_ERROR;
 929                 spin_unlock_irq(&priv->lock);
 930                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 931                 if (ret)
 932                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 933                 spin_lock_irq(&priv->lock);
 934         }
 935
 936         /* Wait for all RX to be drained */
 937         begin = jiffies;
 938
 939         while (!list_empty(&priv->cm.rx_error_list) ||
 940                !list_empty(&priv->cm.rx_flush_list) ||
 941                !list_empty(&priv->cm.rx_drain_list)) {
 942                 if (time_after(jiffies, begin + 5 * HZ)) {
 943                         ipoib_warn(priv, "RX drain timing out\n");
 944
 945                         /*
 946                          * assume the HW is wedged and just free up everything.
 947                          */
 948                         list_splice_init(&priv->cm.rx_flush_list,
 949                                          &priv->cm.rx_reap_list);
 950                         list_splice_init(&priv->cm.rx_error_list,
 951                                          &priv->cm.rx_reap_list);
 952                         list_splice_init(&priv->cm.rx_drain_list,
 953                                          &priv->cm.rx_reap_list);
 954                         break;
 955                 }
 956                 spin_unlock_irq(&priv->lock);
 957                 msleep(1);
 958                 ipoib_drain_cq(dev);
 959                 spin_lock_irq(&priv->lock);
 960         }
 961
 962         spin_unlock_irq(&priv->lock);
 963
 964         ipoib_cm_free_rx_reap_list(dev);
 965
 966         cancel_delayed_work(&priv->cm.stale_task);
 967 }
 968
 969 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 970 {
 971         struct ipoib_cm_tx *p = cm_id->context;
 972         struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
 973         struct ipoib_cm_data *data = event->private_data;
 974         struct sk_buff_head skqueue;
 975         struct ib_qp_attr qp_attr;
 976         int qp_attr_mask, ret;
 977         struct sk_buff *skb;
 978
 979         p->mtu = be32_to_cpu(data->mtu);
 980
 981         if (p->mtu <= IPOIB_ENCAP_LEN) {
 982                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 983                            p->mtu, IPOIB_ENCAP_LEN);
 984                 return -EINVAL;
 985         }
 986
 987         qp_attr.qp_state = IB_QPS_RTR;
 988         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 989         if (ret) {
 990                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 991                 return ret;
 992         }
 993
 994         qp_attr.rq_psn = 0 /* FIXME */;
 995         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
 996         if (ret) {
 997                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 998                 return ret;
 999         }
1000
1001         qp_attr.qp_state = IB_QPS_RTS;
1002         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1003         if (ret) {
1004                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1005                 return ret;
1006         }
1007         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1008         if (ret) {
1009                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1010                 return ret;
1011         }
1012
1013         skb_queue_head_init(&skqueue);
1014
1015         spin_lock_irq(&priv->lock);
1016         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1017         if (p->neigh)
1018                 while ((skb = __skb_dequeue(&p->neigh->queue)))
1019                         __skb_queue_tail(&skqueue, skb);
1020         spin_unlock_irq(&priv->lock);
1021
1022         while ((skb = __skb_dequeue(&skqueue))) {
1023                 skb->dev = p->dev;
1024                 ret = dev_queue_xmit(skb);
1025                 if (ret)
1026                         ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1027                                    __func__, ret);
1028         }
1029
1030         ret = ib_send_cm_rtu(cm_id, NULL, 0);
1031         if (ret) {
1032                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1033                 return ret;
1034         }
1035         return 0;
1036 }
1037
1038 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1039 {
1040         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1041         struct ib_qp_init_attr attr = {
1042                 .send_cq                = priv->recv_cq,
1043                 .recv_cq                = priv->recv_cq,
1044                 .srq                    = priv->cm.srq,
1045                 .cap.max_send_wr        = ipoib_sendq_size,
1046                 .cap.max_send_sge       = 1,
1047                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
1048                 .qp_type                = IB_QPT_RC,
1049                 .qp_context             = tx,
1050                 .create_flags           = IB_QP_CREATE_USE_GFP_NOIO
1051         };
1052
1053         struct ib_qp *tx_qp;
1054
1055         if (dev->features & NETIF_F_SG)
1056                 attr.cap.max_send_sge =
1057                         min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1058
1059         tx_qp = ib_create_qp(priv->pd, &attr);
1060         if (PTR_ERR(tx_qp) == -EINVAL) {
1061                 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
1062                 tx_qp = ib_create_qp(priv->pd, &attr);
1063         }
1064         tx->max_send_sge = attr.cap.max_send_sge;
1065         return tx_qp;
1066 }
1067
1068 static int ipoib_cm_send_req(struct net_device *dev,
1069                              struct ib_cm_id *id, struct ib_qp *qp,
1070                              u32 qpn,
1071                              struct sa_path_rec *pathrec)
1072 {
1073         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1074         struct ipoib_cm_data data = {};
1075         struct ib_cm_req_param req = {};
1076
1077         data.qpn = cpu_to_be32(priv->qp->qp_num);
1078         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1079
1080         req.primary_path                = pathrec;
1081         req.alternate_path              = NULL;
1082         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1083         req.qp_num                      = qp->qp_num;
1084         req.qp_type                     = qp->qp_type;
1085         req.private_data                = &data;
1086         req.private_data_len            = sizeof data;
1087         req.flow_control                = 0;
1088
1089         req.starting_psn                = 0; /* FIXME */
1090
1091         /*
1092          * Pick some arbitrary defaults here; we could make these
1093          * module parameters if anyone cared about setting them.
1094          */
1095         req.responder_resources         = 4;
1096         req.remote_cm_response_timeout  = 20;
1097         req.local_cm_response_timeout   = 20;
1098         req.retry_count                 = 0; /* RFC draft warns against retries */
1099         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
1100         req.max_cm_retries              = 15;
1101         req.srq                         = ipoib_cm_has_srq(dev);
1102         return ib_send_cm_req(id, &req);
1103 }
1104
1105 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1106                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
1107 {
1108         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1109         struct ib_qp_attr qp_attr;
1110         int qp_attr_mask, ret;
1111         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1112         if (ret) {
1113                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1114                 return ret;
1115         }
1116
1117         qp_attr.qp_state = IB_QPS_INIT;
1118         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1119         qp_attr.port_num = priv->port;
1120         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1121
1122         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1123         if (ret) {
1124                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1125                 return ret;
1126         }
1127         return 0;
1128 }
1129
1130 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1131                             struct sa_path_rec *pathrec)
1132 {
1133         struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1134         int ret;
1135
1136         p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
1137                                GFP_NOIO, PAGE_KERNEL);
1138         if (!p->tx_ring) {
1139                 ret = -ENOMEM;
1140                 goto err_tx;
1141         }
1142         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1143
1144         p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1145         if (IS_ERR(p->qp)) {
1146                 ret = PTR_ERR(p->qp);
1147                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1148                 goto err_qp;
1149         }
1150
1151         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1152         if (IS_ERR(p->id)) {
1153                 ret = PTR_ERR(p->id);
1154                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1155                 goto err_id;
1156         }
1157
1158         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
1159         if (ret) {
1160                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1161                 goto err_modify_send;
1162         }
1163
1164         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1165         if (ret) {
1166                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1167                 goto err_modify_send;
1168         }
1169
1170         ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1171                   p->qp->qp_num, pathrec->dgid.raw, qpn);
1172
1173         return 0;
1174
1175 err_modify_send:
1176         ib_destroy_cm_id(p->id);
1177 err_id:
1178         p->id = NULL;
1179         ib_destroy_qp(p->qp);
1180 err_qp:
1181         p->qp = NULL;
1182         vfree(p->tx_ring);
1183 err_tx:
1184         return ret;
1185 }
1186
1187 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1188 {
1189         struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1190         struct ipoib_tx_buf *tx_req;
1191         unsigned long begin;
1192
1193         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1194                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1195
1196         if (p->id)
1197                 ib_destroy_cm_id(p->id);
1198
1199         if (p->tx_ring) {
1200                 /* Wait for all sends to complete */
1201                 begin = jiffies;
1202                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1203                         if (time_after(jiffies, begin + 5 * HZ)) {
1204                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1205                                            p->tx_head - p->tx_tail);
1206                                 goto timeout;
1207                         }
1208
1209                         msleep(1);
1210                 }
1211         }
1212
1213 timeout:
1214
1215         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1216                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1217                 ipoib_dma_unmap_tx(priv, tx_req);
1218                 dev_kfree_skb_any(tx_req->skb);
1219                 ++p->tx_tail;
1220                 netif_tx_lock_bh(p->dev);
1221                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1222                     netif_queue_stopped(p->dev) &&
1223                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1224                         netif_wake_queue(p->dev);
1225                 netif_tx_unlock_bh(p->dev);
1226         }
1227
1228         if (p->qp)
1229                 ib_destroy_qp(p->qp);
1230
1231         vfree(p->tx_ring);
1232         kfree(p);
1233 }
1234
1235 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1236                                struct ib_cm_event *event)
1237 {
1238         struct ipoib_cm_tx *tx = cm_id->context;
1239         struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1240         struct net_device *dev = priv->dev;
1241         struct ipoib_neigh *neigh;
1242         unsigned long flags;
1243         int ret;
1244
1245         switch (event->event) {
1246         case IB_CM_DREQ_RECEIVED:
1247                 ipoib_dbg(priv, "DREQ received.\n");
1248                 ib_send_cm_drep(cm_id, NULL, 0);
1249                 break;
1250         case IB_CM_REP_RECEIVED:
1251                 ipoib_dbg(priv, "REP received.\n");
1252                 ret = ipoib_cm_rep_handler(cm_id, event);
1253                 if (ret)
1254                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1255                                        NULL, 0, NULL, 0);
1256                 break;
1257         case IB_CM_REQ_ERROR:
1258         case IB_CM_REJ_RECEIVED:
1259         case IB_CM_TIMEWAIT_EXIT:
1260                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1261                 netif_tx_lock_bh(dev);
1262                 spin_lock_irqsave(&priv->lock, flags);
1263                 neigh = tx->neigh;
1264
1265                 if (neigh) {
1266                         neigh->cm = NULL;
1267                         ipoib_neigh_free(neigh);
1268
1269                         tx->neigh = NULL;
1270                 }
1271
1272                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1273                         list_move(&tx->list, &priv->cm.reap_list);
1274                         queue_work(priv->wq, &priv->cm.reap_task);
1275                 }
1276
1277                 spin_unlock_irqrestore(&priv->lock, flags);
1278                 netif_tx_unlock_bh(dev);
1279                 break;
1280         default:
1281                 break;
1282         }
1283
1284         return 0;
1285 }
1286
1287 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1288                                        struct ipoib_neigh *neigh)
1289 {
1290         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1291         struct ipoib_cm_tx *tx;
1292
1293         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1294         if (!tx)
1295                 return NULL;
1296
1297         neigh->cm = tx;
1298         tx->neigh = neigh;
1299         tx->path = path;
1300         tx->dev = dev;
1301         list_add(&tx->list, &priv->cm.start_list);
1302         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1303         queue_work(priv->wq, &priv->cm.start_task);
1304         return tx;
1305 }
1306
1307 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1308 {
1309         struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1310         unsigned long flags;
1311         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1312                 spin_lock_irqsave(&priv->lock, flags);
1313                 list_move(&tx->list, &priv->cm.reap_list);
1314                 queue_work(priv->wq, &priv->cm.reap_task);
1315                 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1316                           tx->neigh->daddr + 4);
1317                 tx->neigh = NULL;
1318                 spin_unlock_irqrestore(&priv->lock, flags);
1319         }
1320 }
1321
1322 #define QPN_AND_OPTIONS_OFFSET  4
1323
1324 static void ipoib_cm_tx_start(struct work_struct *work)
1325 {
1326         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1327                                                    cm.start_task);
1328         struct net_device *dev = priv->dev;
1329         struct ipoib_neigh *neigh;
1330         struct ipoib_cm_tx *p;
1331         unsigned long flags;
1332         struct ipoib_path *path;
1333         int ret;
1334
1335         struct sa_path_rec pathrec;
1336         u32 qpn;
1337
1338         netif_tx_lock_bh(dev);
1339         spin_lock_irqsave(&priv->lock, flags);
1340
1341         while (!list_empty(&priv->cm.start_list)) {
1342                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1343                 list_del_init(&p->list);
1344                 neigh = p->neigh;
1345
1346                 qpn = IPOIB_QPN(neigh->daddr);
1347                 /*
1348                  * As long as the search is with these 2 locks,
1349                  * path existence indicates its validity.
1350                  */
1351                 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1352                 if (!path) {
1353                         pr_info("%s ignore not valid path %pI6\n",
1354                                 __func__,
1355                                 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1356                         goto free_neigh;
1357                 }
1358                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1359
1360                 spin_unlock_irqrestore(&priv->lock, flags);
1361                 netif_tx_unlock_bh(dev);
1362
1363                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1364
1365                 netif_tx_lock_bh(dev);
1366                 spin_lock_irqsave(&priv->lock, flags);
1367
1368                 if (ret) {
1369 free_neigh:
1370                         neigh = p->neigh;
1371                         if (neigh) {
1372                                 neigh->cm = NULL;
1373                                 ipoib_neigh_free(neigh);
1374                         }
1375                         list_del(&p->list);
1376                         kfree(p);
1377                 }
1378         }
1379
1380         spin_unlock_irqrestore(&priv->lock, flags);
1381         netif_tx_unlock_bh(dev);
1382 }
1383
1384 static void ipoib_cm_tx_reap(struct work_struct *work)
1385 {
1386         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1387                                                    cm.reap_task);
1388         struct net_device *dev = priv->dev;
1389         struct ipoib_cm_tx *p;
1390         unsigned long flags;
1391
1392         netif_tx_lock_bh(dev);
1393         spin_lock_irqsave(&priv->lock, flags);
1394
1395         while (!list_empty(&priv->cm.reap_list)) {
1396                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1397                 list_del_init(&p->list);
1398                 spin_unlock_irqrestore(&priv->lock, flags);
1399                 netif_tx_unlock_bh(dev);
1400                 ipoib_cm_tx_destroy(p);
1401                 netif_tx_lock_bh(dev);
1402                 spin_lock_irqsave(&priv->lock, flags);
1403         }
1404
1405         spin_unlock_irqrestore(&priv->lock, flags);
1406         netif_tx_unlock_bh(dev);
1407 }
1408
1409 static void ipoib_cm_skb_reap(struct work_struct *work)
1410 {
1411         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1412                                                    cm.skb_task);
1413         struct net_device *dev = priv->dev;
1414         struct sk_buff *skb;
1415         unsigned long flags;
1416         unsigned mtu = priv->mcast_mtu;
1417
1418         netif_tx_lock_bh(dev);
1419         spin_lock_irqsave(&priv->lock, flags);
1420
1421         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1422                 spin_unlock_irqrestore(&priv->lock, flags);
1423                 netif_tx_unlock_bh(dev);
1424
1425                 if (skb->protocol == htons(ETH_P_IP))
1426                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1427 #if IS_ENABLED(CONFIG_IPV6)
1428                 else if (skb->protocol == htons(ETH_P_IPV6))
1429                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1430 #endif
1431                 dev_kfree_skb_any(skb);
1432
1433                 netif_tx_lock_bh(dev);
1434                 spin_lock_irqsave(&priv->lock, flags);
1435         }
1436
1437         spin_unlock_irqrestore(&priv->lock, flags);
1438         netif_tx_unlock_bh(dev);
1439 }
1440
1441 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1442                            unsigned int mtu)
1443 {
1444         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1445         int e = skb_queue_empty(&priv->cm.skb_queue);
1446
1447         if (skb_dst(skb))
1448                 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1449
1450         skb_queue_tail(&priv->cm.skb_queue, skb);
1451         if (e)
1452                 queue_work(priv->wq, &priv->cm.skb_task);
1453 }
1454
1455 static void ipoib_cm_rx_reap(struct work_struct *work)
1456 {
1457         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1458                                                 cm.rx_reap_task)->dev);
1459 }
1460
1461 static void ipoib_cm_stale_task(struct work_struct *work)
1462 {
1463         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1464                                                    cm.stale_task.work);
1465         struct ipoib_cm_rx *p;
1466         int ret;
1467
1468         spin_lock_irq(&priv->lock);
1469         while (!list_empty(&priv->cm.passive_ids)) {
1470                 /* List is sorted by LRU, start from tail,
1471                  * stop when we see a recently used entry */
1472                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1473                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1474                         break;
1475                 list_move(&p->list, &priv->cm.rx_error_list);
1476                 p->state = IPOIB_CM_RX_ERROR;
1477                 spin_unlock_irq(&priv->lock);
1478                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1479                 if (ret)
1480                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1481                 spin_lock_irq(&priv->lock);
1482         }
1483
1484         if (!list_empty(&priv->cm.passive_ids))
1485                 queue_delayed_work(priv->wq,
1486                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1487         spin_unlock_irq(&priv->lock);
1488 }
1489
1490 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1491                          char *buf)
1492 {
1493         struct net_device *dev = to_net_dev(d);
1494         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1495
1496         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1497                 return sprintf(buf, "connected\n");
1498         else
1499                 return sprintf(buf, "datagram\n");
1500 }
1501
1502 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1503                         const char *buf, size_t count)
1504 {
1505         struct net_device *dev = to_net_dev(d);
1506         int ret;
1507         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1508
1509         if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1510                 return -EPERM;
1511
1512         if (!rtnl_trylock())
1513                 return restart_syscall();
1514
1515         ret = ipoib_set_mode(dev, buf);
1516
1517         /* The assumption is that the function ipoib_set_mode returned
1518          * with the rtnl held by it, if not the value -EBUSY returned,
1519          * then no need to rtnl_unlock
1520          */
1521         if (ret != -EBUSY)
1522                 rtnl_unlock();
1523
1524         return (!ret || ret == -EBUSY) ? count : ret;
1525 }
1526
1527 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1528
1529 int ipoib_cm_add_mode_attr(struct net_device *dev)
1530 {
1531         return device_create_file(&dev->dev, &dev_attr_mode);
1532 }
1533
1534 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1535 {
1536         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1537         struct ib_srq_init_attr srq_init_attr = {
1538                 .srq_type = IB_SRQT_BASIC,
1539                 .attr = {
1540                         .max_wr  = ipoib_recvq_size,
1541                         .max_sge = max_sge
1542                 }
1543         };
1544
1545         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1546         if (IS_ERR(priv->cm.srq)) {
1547                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1548                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1549                                priv->ca->name, PTR_ERR(priv->cm.srq));
1550                 priv->cm.srq = NULL;
1551                 return;
1552         }
1553
1554         priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1555         if (!priv->cm.srq_ring) {
1556                 ib_destroy_srq(priv->cm.srq);
1557                 priv->cm.srq = NULL;
1558                 return;
1559         }
1560
1561 }
1562
1563 int ipoib_cm_dev_init(struct net_device *dev)
1564 {
1565         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1566         int max_srq_sge, i;
1567
1568         INIT_LIST_HEAD(&priv->cm.passive_ids);
1569         INIT_LIST_HEAD(&priv->cm.reap_list);
1570         INIT_LIST_HEAD(&priv->cm.start_list);
1571         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1572         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1573         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1574         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1575         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1576         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1577         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1578         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1579         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1580
1581         skb_queue_head_init(&priv->cm.skb_queue);
1582
1583         ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1584
1585         max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1586         ipoib_cm_create_srq(dev, max_srq_sge);
1587         if (ipoib_cm_has_srq(dev)) {
1588                 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1589                 priv->cm.num_frags  = max_srq_sge;
1590                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1591                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1592         } else {
1593                 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1594                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1595         }
1596
1597         ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1598
1599         if (ipoib_cm_has_srq(dev)) {
1600                 for (i = 0; i < ipoib_recvq_size; ++i) {
1601                         if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1602                                                    priv->cm.num_frags - 1,
1603                                                    priv->cm.srq_ring[i].mapping,
1604                                                    GFP_KERNEL)) {
1605                                 ipoib_warn(priv, "failed to allocate "
1606                                            "receive buffer %d\n", i);
1607                                 ipoib_cm_dev_cleanup(dev);
1608                                 return -ENOMEM;
1609                         }
1610
1611                         if (ipoib_cm_post_receive_srq(dev, i)) {
1612                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1613                                            "failed for buf %d\n", i);
1614                                 ipoib_cm_dev_cleanup(dev);
1615                                 return -EIO;
1616                         }
1617                 }
1618         }
1619
1620         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1621         return 0;
1622 }
1623
1624 void ipoib_cm_dev_cleanup(struct net_device *dev)
1625 {
1626         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1627         int ret;
1628
1629         if (!priv->cm.srq)
1630                 return;
1631
1632         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1633
1634         ret = ib_destroy_srq(priv->cm.srq);
1635         if (ret)
1636                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1637
1638         priv->cm.srq = NULL;
1639         if (!priv->cm.srq_ring)
1640                 return;
1641
1642         ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1643         priv->cm.srq_ring = NULL;
1644 }