linux/drivers/infiniband/ulp/ipoib/ipoib_cm.c
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   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
  46int ipoib_max_conn_qp = 128;
  47
  48module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
  49MODULE_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
  54static int data_debug_level;
  55
  56module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
  57MODULE_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
  70static 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
  76static struct ib_send_wr ipoib_cm_rx_drain_wr = {
  77        .opcode = IB_WR_SEND,
  78};
  79
  80static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
  81                               const struct ib_cm_event *event);
  82
  83static 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
  94static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
  95{
  96        struct ipoib_dev_priv *priv = ipoib_priv(dev);
  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, NULL);
 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
 116static 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        int i, ret;
 123
 124        wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
 125
 126        for (i = 0; i < IPOIB_CM_RX_SG; ++i)
 127                sge[i].addr = rx->rx_ring[id].mapping[i];
 128
 129        ret = ib_post_recv(rx->qp, wr, NULL);
 130        if (unlikely(ret)) {
 131                ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
 132                ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 133                                      rx->rx_ring[id].mapping);
 134                dev_kfree_skb_any(rx->rx_ring[id].skb);
 135                rx->rx_ring[id].skb = NULL;
 136        }
 137
 138        return ret;
 139}
 140
 141static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
 142                                             struct ipoib_cm_rx_buf *rx_ring,
 143                                             int id, int frags,
 144                                             u64 mapping[IPOIB_CM_RX_SG],
 145                                             gfp_t gfp)
 146{
 147        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 148        struct sk_buff *skb;
 149        int i;
 150
 151        skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
 152        if (unlikely(!skb))
 153                return NULL;
 154
 155        /*
 156         * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
 157         * IP header to a multiple of 16.
 158         */
 159        skb_reserve(skb, IPOIB_CM_RX_RESERVE);
 160
 161        mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
 162                                       DMA_FROM_DEVICE);
 163        if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
 164                dev_kfree_skb_any(skb);
 165                return NULL;
 166        }
 167
 168        for (i = 0; i < frags; i++) {
 169                struct page *page = alloc_page(gfp);
 170
 171                if (!page)
 172                        goto partial_error;
 173                skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
 174
 175                mapping[i + 1] = ib_dma_map_page(priv->ca, page,
 176                                                 0, PAGE_SIZE, DMA_FROM_DEVICE);
 177                if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
 178                        goto partial_error;
 179        }
 180
 181        rx_ring[id].skb = skb;
 182        return skb;
 183
 184partial_error:
 185
 186        ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
 187
 188        for (; i > 0; --i)
 189                ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
 190
 191        dev_kfree_skb_any(skb);
 192        return NULL;
 193}
 194
 195static void ipoib_cm_free_rx_ring(struct net_device *dev,
 196                                  struct ipoib_cm_rx_buf *rx_ring)
 197{
 198        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 199        int i;
 200
 201        for (i = 0; i < ipoib_recvq_size; ++i)
 202                if (rx_ring[i].skb) {
 203                        ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
 204                                              rx_ring[i].mapping);
 205                        dev_kfree_skb_any(rx_ring[i].skb);
 206                }
 207
 208        vfree(rx_ring);
 209}
 210
 211static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
 212{
 213        struct ipoib_cm_rx *p;
 214
 215        /* We only reserved 1 extra slot in CQ for drain WRs, so
 216         * make sure we have at most 1 outstanding WR. */
 217        if (list_empty(&priv->cm.rx_flush_list) ||
 218            !list_empty(&priv->cm.rx_drain_list))
 219                return;
 220
 221        /*
 222         * QPs on flush list are error state.  This way, a "flush
 223         * error" WC will be immediately generated for each WR we post.
 224         */
 225        p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
 226        ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
 227        if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, NULL))
 228                ipoib_warn(priv, "failed to post drain wr\n");
 229
 230        list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
 231}
 232
 233static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
 234{
 235        struct ipoib_cm_rx *p = ctx;
 236        struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
 237        unsigned long flags;
 238
 239        if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
 240                return;
 241
 242        spin_lock_irqsave(&priv->lock, flags);
 243        list_move(&p->list, &priv->cm.rx_flush_list);
 244        p->state = IPOIB_CM_RX_FLUSH;
 245        ipoib_cm_start_rx_drain(priv);
 246        spin_unlock_irqrestore(&priv->lock, flags);
 247}
 248
 249static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
 250                                           struct ipoib_cm_rx *p)
 251{
 252        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 253        struct ib_qp_init_attr attr = {
 254                .event_handler = ipoib_cm_rx_event_handler,
 255                .send_cq = priv->recv_cq, /* For drain WR */
 256                .recv_cq = priv->recv_cq,
 257                .srq = priv->cm.srq,
 258                .cap.max_send_wr = 1, /* For drain WR */
 259                .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
 260                .sq_sig_type = IB_SIGNAL_ALL_WR,
 261                .qp_type = IB_QPT_RC,
 262                .qp_context = p,
 263        };
 264
 265        if (!ipoib_cm_has_srq(dev)) {
 266                attr.cap.max_recv_wr  = ipoib_recvq_size;
 267                attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
 268        }
 269
 270        return ib_create_qp(priv->pd, &attr);
 271}
 272
 273static int ipoib_cm_modify_rx_qp(struct net_device *dev,
 274                                 struct ib_cm_id *cm_id, struct ib_qp *qp,
 275                                 unsigned int psn)
 276{
 277        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 278        struct ib_qp_attr qp_attr;
 279        int qp_attr_mask, ret;
 280
 281        qp_attr.qp_state = IB_QPS_INIT;
 282        ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 283        if (ret) {
 284                ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
 285                return ret;
 286        }
 287        ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 288        if (ret) {
 289                ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
 290                return ret;
 291        }
 292        qp_attr.qp_state = IB_QPS_RTR;
 293        ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 294        if (ret) {
 295                ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
 296                return ret;
 297        }
 298        qp_attr.rq_psn = psn;
 299        ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 300        if (ret) {
 301                ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
 302                return ret;
 303        }
 304
 305        /*
 306         * Current Mellanox HCA firmware won't generate completions
 307         * with error for drain WRs unless the QP has been moved to
 308         * RTS first. This work-around leaves a window where a QP has
 309         * moved to error asynchronously, but this will eventually get
 310         * fixed in firmware, so let's not error out if modify QP
 311         * fails.
 312         */
 313        qp_attr.qp_state = IB_QPS_RTS;
 314        ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
 315        if (ret) {
 316                ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
 317                return 0;
 318        }
 319        ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 320        if (ret) {
 321                ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
 322                return 0;
 323        }
 324
 325        return 0;
 326}
 327
 328static void ipoib_cm_init_rx_wr(struct net_device *dev,
 329                                struct ib_recv_wr *wr,
 330                                struct ib_sge *sge)
 331{
 332        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 333        int i;
 334
 335        for (i = 0; i < priv->cm.num_frags; ++i)
 336                sge[i].lkey = priv->pd->local_dma_lkey;
 337
 338        sge[0].length = IPOIB_CM_HEAD_SIZE;
 339        for (i = 1; i < priv->cm.num_frags; ++i)
 340                sge[i].length = PAGE_SIZE;
 341
 342        wr->next    = NULL;
 343        wr->sg_list = sge;
 344        wr->num_sge = priv->cm.num_frags;
 345}
 346
 347static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
 348                                   struct ipoib_cm_rx *rx)
 349{
 350        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 351        struct {
 352                struct ib_recv_wr wr;
 353                struct ib_sge sge[IPOIB_CM_RX_SG];
 354        } *t;
 355        int ret;
 356        int i;
 357
 358        rx->rx_ring = vzalloc(array_size(ipoib_recvq_size,
 359                                         sizeof(*rx->rx_ring)));
 360        if (!rx->rx_ring)
 361                return -ENOMEM;
 362
 363        t = kmalloc(sizeof(*t), GFP_KERNEL);
 364        if (!t) {
 365                ret = -ENOMEM;
 366                goto err_free_1;
 367        }
 368
 369        ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
 370
 371        spin_lock_irq(&priv->lock);
 372
 373        if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
 374                spin_unlock_irq(&priv->lock);
 375                ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
 376                ret = -EINVAL;
 377                goto err_free;
 378        } else
 379                ++priv->cm.nonsrq_conn_qp;
 380
 381        spin_unlock_irq(&priv->lock);
 382
 383        for (i = 0; i < ipoib_recvq_size; ++i) {
 384                if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
 385                                           rx->rx_ring[i].mapping,
 386                                           GFP_KERNEL)) {
 387                        ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 388                        ret = -ENOMEM;
 389                        goto err_count;
 390                }
 391                ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
 392                if (ret) {
 393                        ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
 394                                   "failed for buf %d\n", i);
 395                        ret = -EIO;
 396                        goto err_count;
 397                }
 398        }
 399
 400        rx->recv_count = ipoib_recvq_size;
 401
 402        kfree(t);
 403
 404        return 0;
 405
 406err_count:
 407        spin_lock_irq(&priv->lock);
 408        --priv->cm.nonsrq_conn_qp;
 409        spin_unlock_irq(&priv->lock);
 410
 411err_free:
 412        kfree(t);
 413
 414err_free_1:
 415        ipoib_cm_free_rx_ring(dev, rx->rx_ring);
 416
 417        return ret;
 418}
 419
 420static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
 421                             struct ib_qp *qp,
 422                             const struct ib_cm_req_event_param *req,
 423                             unsigned int 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
 442static int ipoib_cm_req_handler(struct ib_cm_id *cm_id,
 443                                const 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 int 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
 497err_modify:
 498        ib_destroy_qp(p->qp);
 499err_qp:
 500        kfree(p);
 501        return ret;
 502}
 503
 504static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
 505                               const 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 */
 527static 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_t(unsigned int, length, 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
 560void 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,
 598                          "cm recv error (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 -
 644                           min_t(u32, wc->byte_len, IPOIB_CM_HEAD_SIZE)) /
 645                PAGE_SIZE;
 646
 647        newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
 648                                       mapping, GFP_ATOMIC);
 649        if (unlikely(!newskb)) {
 650                /*
 651                 * If we can't allocate a new RX buffer, dump
 652                 * this packet and reuse the old buffer.
 653                 */
 654                ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
 655                ++dev->stats.rx_dropped;
 656                goto repost;
 657        }
 658
 659        ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
 660        memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof(*mapping));
 661
 662        ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 663                       wc->byte_len, wc->slid);
 664
 665        skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
 666
 667copied:
 668        skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 669        skb_add_pseudo_hdr(skb);
 670
 671        ++dev->stats.rx_packets;
 672        dev->stats.rx_bytes += skb->len;
 673
 674        skb->dev = dev;
 675        /* XXX get correct PACKET_ type here */
 676        skb->pkt_type = PACKET_HOST;
 677        netif_receive_skb(skb);
 678
 679repost:
 680        if (has_srq) {
 681                if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
 682                        ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
 683                                   "for buf %d\n", wr_id);
 684        } else {
 685                if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
 686                                                          &priv->cm.rx_wr,
 687                                                          priv->cm.rx_sge,
 688                                                          wr_id))) {
 689                        --p->recv_count;
 690                        ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
 691                                   "for buf %d\n", wr_id);
 692                }
 693        }
 694}
 695
 696static inline int post_send(struct ipoib_dev_priv *priv,
 697                            struct ipoib_cm_tx *tx,
 698                            unsigned int wr_id,
 699                            struct ipoib_tx_buf *tx_req)
 700{
 701        ipoib_build_sge(priv, tx_req);
 702
 703        priv->tx_wr.wr.wr_id    = wr_id | IPOIB_OP_CM;
 704
 705        return ib_post_send(tx->qp, &priv->tx_wr.wr, NULL);
 706}
 707
 708void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
 709{
 710        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 711        struct ipoib_tx_buf *tx_req;
 712        int rc;
 713        unsigned int usable_sge = tx->max_send_sge - !!skb_headlen(skb);
 714
 715        if (unlikely(skb->len > tx->mtu)) {
 716                ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 717                           skb->len, tx->mtu);
 718                ++dev->stats.tx_dropped;
 719                ++dev->stats.tx_errors;
 720                ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
 721                return;
 722        }
 723        if (skb_shinfo(skb)->nr_frags > usable_sge) {
 724                if (skb_linearize(skb) < 0) {
 725                        ipoib_warn(priv, "skb could not be linearized\n");
 726                        ++dev->stats.tx_dropped;
 727                        ++dev->stats.tx_errors;
 728                        dev_kfree_skb_any(skb);
 729                        return;
 730                }
 731                /* Does skb_linearize return ok without reducing nr_frags? */
 732                if (skb_shinfo(skb)->nr_frags > usable_sge) {
 733                        ipoib_warn(priv, "too many frags after skb linearize\n");
 734                        ++dev->stats.tx_dropped;
 735                        ++dev->stats.tx_errors;
 736                        dev_kfree_skb_any(skb);
 737                        return;
 738                }
 739        }
 740        ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
 741                       tx->tx_head, skb->len, tx->qp->qp_num);
 742
 743        /*
 744         * We put the skb into the tx_ring _before_ we call post_send()
 745         * because it's entirely possible that the completion handler will
 746         * run before we execute anything after the post_send().  That
 747         * means we have to make sure everything is properly recorded and
 748         * our state is consistent before we call post_send().
 749         */
 750        tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
 751        tx_req->skb = skb;
 752
 753        if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 754                ++dev->stats.tx_errors;
 755                dev_kfree_skb_any(skb);
 756                return;
 757        }
 758
 759        if ((priv->tx_head - priv->tx_tail) == ipoib_sendq_size - 1) {
 760                ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
 761                          tx->qp->qp_num);
 762                netif_stop_queue(dev);
 763        }
 764
 765        skb_orphan(skb);
 766        skb_dst_drop(skb);
 767
 768        if (netif_queue_stopped(dev)) {
 769                rc = ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
 770                                      IB_CQ_REPORT_MISSED_EVENTS);
 771                if (unlikely(rc < 0))
 772                        ipoib_warn(priv, "IPoIB/CM:request notify on send CQ failed\n");
 773                else if (rc)
 774                        napi_schedule(&priv->send_napi);
 775        }
 776
 777        rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
 778        if (unlikely(rc)) {
 779                ipoib_warn(priv, "IPoIB/CM:post_send failed, error %d\n", rc);
 780                ++dev->stats.tx_errors;
 781                ipoib_dma_unmap_tx(priv, tx_req);
 782                dev_kfree_skb_any(skb);
 783
 784                if (netif_queue_stopped(dev))
 785                        netif_wake_queue(dev);
 786        } else {
 787                netif_trans_update(dev);
 788                ++tx->tx_head;
 789                ++priv->tx_head;
 790        }
 791}
 792
 793void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 794{
 795        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 796        struct ipoib_cm_tx *tx = wc->qp->qp_context;
 797        unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
 798        struct ipoib_tx_buf *tx_req;
 799        unsigned long flags;
 800
 801        ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
 802                       wr_id, wc->status);
 803
 804        if (unlikely(wr_id >= ipoib_sendq_size)) {
 805                ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
 806                           wr_id, ipoib_sendq_size);
 807                return;
 808        }
 809
 810        tx_req = &tx->tx_ring[wr_id];
 811
 812        ipoib_dma_unmap_tx(priv, tx_req);
 813
 814        /* FIXME: is this right? Shouldn't we only increment on success? */
 815        ++dev->stats.tx_packets;
 816        dev->stats.tx_bytes += tx_req->skb->len;
 817
 818        dev_kfree_skb_any(tx_req->skb);
 819
 820        netif_tx_lock(dev);
 821
 822        ++tx->tx_tail;
 823        ++priv->tx_tail;
 824
 825        if (unlikely(netif_queue_stopped(dev) &&
 826                     (priv->tx_head - priv->tx_tail) <= ipoib_sendq_size >> 1 &&
 827                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
 828                netif_wake_queue(dev);
 829
 830        if (wc->status != IB_WC_SUCCESS &&
 831            wc->status != IB_WC_WR_FLUSH_ERR) {
 832                struct ipoib_neigh *neigh;
 833
 834                /* IB_WC[_RNR]_RETRY_EXC_ERR error is part of the life cycle,
 835                 * so don't make waves.
 836                 */
 837                if (wc->status == IB_WC_RNR_RETRY_EXC_ERR ||
 838                    wc->status == IB_WC_RETRY_EXC_ERR)
 839                        ipoib_dbg(priv,
 840                                  "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
 841                                   __func__, wc->status, wr_id, wc->vendor_err);
 842                else
 843                        ipoib_warn(priv,
 844                                    "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
 845                                   __func__, wc->status, wr_id, wc->vendor_err);
 846
 847                spin_lock_irqsave(&priv->lock, flags);
 848                neigh = tx->neigh;
 849
 850                if (neigh) {
 851                        neigh->cm = NULL;
 852                        ipoib_neigh_free(neigh);
 853
 854                        tx->neigh = NULL;
 855                }
 856
 857                if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
 858                        list_move(&tx->list, &priv->cm.reap_list);
 859                        queue_work(priv->wq, &priv->cm.reap_task);
 860                }
 861
 862                clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
 863
 864                spin_unlock_irqrestore(&priv->lock, flags);
 865        }
 866
 867        netif_tx_unlock(dev);
 868}
 869
 870int ipoib_cm_dev_open(struct net_device *dev)
 871{
 872        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 873        int ret;
 874
 875        if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
 876                return 0;
 877
 878        priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
 879        if (IS_ERR(priv->cm.id)) {
 880                pr_warn("%s: failed to create CM ID\n", priv->ca->name);
 881                ret = PTR_ERR(priv->cm.id);
 882                goto err_cm;
 883        }
 884
 885        ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
 886                           0);
 887        if (ret) {
 888                pr_warn("%s: failed to listen on ID 0x%llx\n", priv->ca->name,
 889                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
 890                goto err_listen;
 891        }
 892
 893        return 0;
 894
 895err_listen:
 896        ib_destroy_cm_id(priv->cm.id);
 897err_cm:
 898        priv->cm.id = NULL;
 899        return ret;
 900}
 901
 902static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
 903{
 904        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 905        struct ipoib_cm_rx *rx, *n;
 906        LIST_HEAD(list);
 907
 908        spin_lock_irq(&priv->lock);
 909        list_splice_init(&priv->cm.rx_reap_list, &list);
 910        spin_unlock_irq(&priv->lock);
 911
 912        list_for_each_entry_safe(rx, n, &list, list) {
 913                ib_destroy_cm_id(rx->id);
 914                ib_destroy_qp(rx->qp);
 915                if (!ipoib_cm_has_srq(dev)) {
 916                        ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
 917                        spin_lock_irq(&priv->lock);
 918                        --priv->cm.nonsrq_conn_qp;
 919                        spin_unlock_irq(&priv->lock);
 920                }
 921                kfree(rx);
 922        }
 923}
 924
 925void ipoib_cm_dev_stop(struct net_device *dev)
 926{
 927        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 928        struct ipoib_cm_rx *p;
 929        unsigned long begin;
 930        int ret;
 931
 932        if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
 933                return;
 934
 935        ib_destroy_cm_id(priv->cm.id);
 936        priv->cm.id = NULL;
 937
 938        spin_lock_irq(&priv->lock);
 939        while (!list_empty(&priv->cm.passive_ids)) {
 940                p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
 941                list_move(&p->list, &priv->cm.rx_error_list);
 942                p->state = IPOIB_CM_RX_ERROR;
 943                spin_unlock_irq(&priv->lock);
 944                ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
 945                if (ret)
 946                        ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
 947                spin_lock_irq(&priv->lock);
 948        }
 949
 950        /* Wait for all RX to be drained */
 951        begin = jiffies;
 952
 953        while (!list_empty(&priv->cm.rx_error_list) ||
 954               !list_empty(&priv->cm.rx_flush_list) ||
 955               !list_empty(&priv->cm.rx_drain_list)) {
 956                if (time_after(jiffies, begin + 5 * HZ)) {
 957                        ipoib_warn(priv, "RX drain timing out\n");
 958
 959                        /*
 960                         * assume the HW is wedged and just free up everything.
 961                         */
 962                        list_splice_init(&priv->cm.rx_flush_list,
 963                                         &priv->cm.rx_reap_list);
 964                        list_splice_init(&priv->cm.rx_error_list,
 965                                         &priv->cm.rx_reap_list);
 966                        list_splice_init(&priv->cm.rx_drain_list,
 967                                         &priv->cm.rx_reap_list);
 968                        break;
 969                }
 970                spin_unlock_irq(&priv->lock);
 971                usleep_range(1000, 2000);
 972                ipoib_drain_cq(dev);
 973                spin_lock_irq(&priv->lock);
 974        }
 975
 976        spin_unlock_irq(&priv->lock);
 977
 978        ipoib_cm_free_rx_reap_list(dev);
 979
 980        cancel_delayed_work(&priv->cm.stale_task);
 981}
 982
 983static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id,
 984                                const struct ib_cm_event *event)
 985{
 986        struct ipoib_cm_tx *p = cm_id->context;
 987        struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
 988        struct ipoib_cm_data *data = event->private_data;
 989        struct sk_buff_head skqueue;
 990        struct ib_qp_attr qp_attr;
 991        int qp_attr_mask, ret;
 992        struct sk_buff *skb;
 993
 994        p->mtu = be32_to_cpu(data->mtu);
 995
 996        if (p->mtu <= IPOIB_ENCAP_LEN) {
 997                ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
 998                           p->mtu, IPOIB_ENCAP_LEN);
 999                return -EINVAL;
1000        }
1001
1002        qp_attr.qp_state = IB_QPS_RTR;
1003        ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1004        if (ret) {
1005                ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
1006                return ret;
1007        }
1008
1009        qp_attr.rq_psn = 0 /* FIXME */;
1010        ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1011        if (ret) {
1012                ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
1013                return ret;
1014        }
1015
1016        qp_attr.qp_state = IB_QPS_RTS;
1017        ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1018        if (ret) {
1019                ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1020                return ret;
1021        }
1022        ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1023        if (ret) {
1024                ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1025                return ret;
1026        }
1027
1028        skb_queue_head_init(&skqueue);
1029
1030        netif_tx_lock_bh(p->dev);
1031        spin_lock_irq(&priv->lock);
1032        set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1033        if (p->neigh)
1034                while ((skb = __skb_dequeue(&p->neigh->queue)))
1035                        __skb_queue_tail(&skqueue, skb);
1036        spin_unlock_irq(&priv->lock);
1037        netif_tx_unlock_bh(p->dev);
1038
1039        while ((skb = __skb_dequeue(&skqueue))) {
1040                skb->dev = p->dev;
1041                ret = dev_queue_xmit(skb);
1042                if (ret)
1043                        ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1044                                   __func__, ret);
1045        }
1046
1047        ret = ib_send_cm_rtu(cm_id, NULL, 0);
1048        if (ret) {
1049                ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1050                return ret;
1051        }
1052        return 0;
1053}
1054
1055static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1056{
1057        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1058        struct ib_qp_init_attr attr = {
1059                .send_cq                = priv->send_cq,
1060                .recv_cq                = priv->recv_cq,
1061                .srq                    = priv->cm.srq,
1062                .cap.max_send_wr        = ipoib_sendq_size,
1063                .cap.max_send_sge       = 1,
1064                .sq_sig_type            = IB_SIGNAL_ALL_WR,
1065                .qp_type                = IB_QPT_RC,
1066                .qp_context             = tx,
1067                .create_flags           = 0
1068        };
1069        struct ib_qp *tx_qp;
1070
1071        if (dev->features & NETIF_F_SG)
1072                attr.cap.max_send_sge = min_t(u32, priv->ca->attrs.max_send_sge,
1073                                              MAX_SKB_FRAGS + 1);
1074
1075        tx_qp = ib_create_qp(priv->pd, &attr);
1076        tx->max_send_sge = attr.cap.max_send_sge;
1077        return tx_qp;
1078}
1079
1080static int ipoib_cm_send_req(struct net_device *dev,
1081                             struct ib_cm_id *id, struct ib_qp *qp,
1082                             u32 qpn,
1083                             struct sa_path_rec *pathrec)
1084{
1085        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1086        struct ipoib_cm_data data = {};
1087        struct ib_cm_req_param req = {};
1088
1089        data.qpn = cpu_to_be32(priv->qp->qp_num);
1090        data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1091
1092        req.primary_path                = pathrec;
1093        req.alternate_path              = NULL;
1094        req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1095        req.qp_num                      = qp->qp_num;
1096        req.qp_type                     = qp->qp_type;
1097        req.private_data                = &data;
1098        req.private_data_len            = sizeof(data);
1099        req.flow_control                = 0;
1100
1101        req.starting_psn                = 0; /* FIXME */
1102
1103        /*
1104         * Pick some arbitrary defaults here; we could make these
1105         * module parameters if anyone cared about setting them.
1106         */
1107        req.responder_resources         = 4;
1108        req.remote_cm_response_timeout  = 20;
1109        req.local_cm_response_timeout   = 20;
1110        req.retry_count                 = 0; /* RFC draft warns against retries */
1111        req.rnr_retry_count             = 0; /* RFC draft warns against retries */
1112        req.max_cm_retries              = 15;
1113        req.srq                         = ipoib_cm_has_srq(dev);
1114        return ib_send_cm_req(id, &req);
1115}
1116
1117static int ipoib_cm_modify_tx_init(struct net_device *dev,
1118                                  struct ib_cm_id *cm_id, struct ib_qp *qp)
1119{
1120        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1121        struct ib_qp_attr qp_attr;
1122        int qp_attr_mask, ret;
1123        ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1124        if (ret) {
1125                ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1126                return ret;
1127        }
1128
1129        qp_attr.qp_state = IB_QPS_INIT;
1130        qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1131        qp_attr.port_num = priv->port;
1132        qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1133
1134        ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1135        if (ret) {
1136                ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1137                return ret;
1138        }
1139        return 0;
1140}
1141
1142static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1143                            struct sa_path_rec *pathrec)
1144{
1145        struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1146        unsigned int noio_flag;
1147        int ret;
1148
1149        noio_flag = memalloc_noio_save();
1150        p->tx_ring = vzalloc(array_size(ipoib_sendq_size, sizeof(*p->tx_ring)));
1151        if (!p->tx_ring) {
1152                memalloc_noio_restore(noio_flag);
1153                ret = -ENOMEM;
1154                goto err_tx;
1155        }
1156        memset(p->tx_ring, 0, ipoib_sendq_size * sizeof(*p->tx_ring));
1157
1158        p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1159        memalloc_noio_restore(noio_flag);
1160        if (IS_ERR(p->qp)) {
1161                ret = PTR_ERR(p->qp);
1162                ipoib_warn(priv, "failed to create tx qp: %d\n", ret);
1163                goto err_qp;
1164        }
1165
1166        p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1167        if (IS_ERR(p->id)) {
1168                ret = PTR_ERR(p->id);
1169                ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1170                goto err_id;
1171        }
1172
1173        ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
1174        if (ret) {
1175                ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1176                goto err_modify_send;
1177        }
1178
1179        ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1180        if (ret) {
1181                ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1182                goto err_modify_send;
1183        }
1184
1185        ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1186                  p->qp->qp_num, pathrec->dgid.raw, qpn);
1187
1188        return 0;
1189
1190err_modify_send:
1191        ib_destroy_cm_id(p->id);
1192err_id:
1193        p->id = NULL;
1194        ib_destroy_qp(p->qp);
1195err_qp:
1196        p->qp = NULL;
1197        vfree(p->tx_ring);
1198err_tx:
1199        return ret;
1200}
1201
1202static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1203{
1204        struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1205        struct ipoib_tx_buf *tx_req;
1206        unsigned long begin;
1207
1208        ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1209                  p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1210
1211        if (p->id)
1212                ib_destroy_cm_id(p->id);
1213
1214        if (p->tx_ring) {
1215                /* Wait for all sends to complete */
1216                begin = jiffies;
1217                while ((int) p->tx_tail - (int) p->tx_head < 0) {
1218                        if (time_after(jiffies, begin + 5 * HZ)) {
1219                                ipoib_warn(priv, "timing out; %d sends not completed\n",
1220                                           p->tx_head - p->tx_tail);
1221                                goto timeout;
1222                        }
1223
1224                        usleep_range(1000, 2000);
1225                }
1226        }
1227
1228timeout:
1229
1230        while ((int) p->tx_tail - (int) p->tx_head < 0) {
1231                tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1232                ipoib_dma_unmap_tx(priv, tx_req);
1233                dev_kfree_skb_any(tx_req->skb);
1234                netif_tx_lock_bh(p->dev);
1235                ++p->tx_tail;
1236                ++priv->tx_tail;
1237                if (unlikely(priv->tx_head - priv->tx_tail == ipoib_sendq_size >> 1) &&
1238                    netif_queue_stopped(p->dev) &&
1239                    test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1240                        netif_wake_queue(p->dev);
1241                netif_tx_unlock_bh(p->dev);
1242        }
1243
1244        if (p->qp)
1245                ib_destroy_qp(p->qp);
1246
1247        vfree(p->tx_ring);
1248        kfree(p);
1249}
1250
1251static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1252                               const struct ib_cm_event *event)
1253{
1254        struct ipoib_cm_tx *tx = cm_id->context;
1255        struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1256        struct net_device *dev = priv->dev;
1257        struct ipoib_neigh *neigh;
1258        unsigned long flags;
1259        int ret;
1260
1261        switch (event->event) {
1262        case IB_CM_DREQ_RECEIVED:
1263                ipoib_dbg(priv, "DREQ received.\n");
1264                ib_send_cm_drep(cm_id, NULL, 0);
1265                break;
1266        case IB_CM_REP_RECEIVED:
1267                ipoib_dbg(priv, "REP received.\n");
1268                ret = ipoib_cm_rep_handler(cm_id, event);
1269                if (ret)
1270                        ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1271                                       NULL, 0, NULL, 0);
1272                break;
1273        case IB_CM_REQ_ERROR:
1274        case IB_CM_REJ_RECEIVED:
1275        case IB_CM_TIMEWAIT_EXIT:
1276                ipoib_dbg(priv, "CM error %d.\n", event->event);
1277                netif_tx_lock_bh(dev);
1278                spin_lock_irqsave(&priv->lock, flags);
1279                neigh = tx->neigh;
1280
1281                if (neigh) {
1282                        neigh->cm = NULL;
1283                        ipoib_neigh_free(neigh);
1284
1285                        tx->neigh = NULL;
1286                }
1287
1288                if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1289                        list_move(&tx->list, &priv->cm.reap_list);
1290                        queue_work(priv->wq, &priv->cm.reap_task);
1291                }
1292
1293                spin_unlock_irqrestore(&priv->lock, flags);
1294                netif_tx_unlock_bh(dev);
1295                break;
1296        default:
1297                break;
1298        }
1299
1300        return 0;
1301}
1302
1303struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1304                                       struct ipoib_neigh *neigh)
1305{
1306        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1307        struct ipoib_cm_tx *tx;
1308
1309        tx = kzalloc(sizeof(*tx), GFP_ATOMIC);
1310        if (!tx)
1311                return NULL;
1312
1313        neigh->cm = tx;
1314        tx->neigh = neigh;
1315        tx->path = path;
1316        tx->dev = dev;
1317        list_add(&tx->list, &priv->cm.start_list);
1318        set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1319        queue_work(priv->wq, &priv->cm.start_task);
1320        return tx;
1321}
1322
1323void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1324{
1325        struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1326        unsigned long flags;
1327        if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1328                spin_lock_irqsave(&priv->lock, flags);
1329                list_move(&tx->list, &priv->cm.reap_list);
1330                queue_work(priv->wq, &priv->cm.reap_task);
1331                ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1332                          tx->neigh->daddr + 4);
1333                tx->neigh = NULL;
1334                spin_unlock_irqrestore(&priv->lock, flags);
1335        }
1336}
1337
1338#define QPN_AND_OPTIONS_OFFSET  4
1339
1340static void ipoib_cm_tx_start(struct work_struct *work)
1341{
1342        struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1343                                                   cm.start_task);
1344        struct net_device *dev = priv->dev;
1345        struct ipoib_neigh *neigh;
1346        struct ipoib_cm_tx *p;
1347        unsigned long flags;
1348        struct ipoib_path *path;
1349        int ret;
1350
1351        struct sa_path_rec pathrec;
1352        u32 qpn;
1353
1354        netif_tx_lock_bh(dev);
1355        spin_lock_irqsave(&priv->lock, flags);
1356
1357        while (!list_empty(&priv->cm.start_list)) {
1358                p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1359                list_del_init(&p->list);
1360                neigh = p->neigh;
1361
1362                qpn = IPOIB_QPN(neigh->daddr);
1363                /*
1364                 * As long as the search is with these 2 locks,
1365                 * path existence indicates its validity.
1366                 */
1367                path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1368                if (!path) {
1369                        pr_info("%s ignore not valid path %pI6\n",
1370                                __func__,
1371                                neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1372                        goto free_neigh;
1373                }
1374                memcpy(&pathrec, &p->path->pathrec, sizeof(pathrec));
1375
1376                spin_unlock_irqrestore(&priv->lock, flags);
1377                netif_tx_unlock_bh(dev);
1378
1379                ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1380
1381                netif_tx_lock_bh(dev);
1382                spin_lock_irqsave(&priv->lock, flags);
1383
1384                if (ret) {
1385free_neigh:
1386                        neigh = p->neigh;
1387                        if (neigh) {
1388                                neigh->cm = NULL;
1389                                ipoib_neigh_free(neigh);
1390                        }
1391                        list_del(&p->list);
1392                        kfree(p);
1393                }
1394        }
1395
1396        spin_unlock_irqrestore(&priv->lock, flags);
1397        netif_tx_unlock_bh(dev);
1398}
1399
1400static void ipoib_cm_tx_reap(struct work_struct *work)
1401{
1402        struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1403                                                   cm.reap_task);
1404        struct net_device *dev = priv->dev;
1405        struct ipoib_cm_tx *p;
1406        unsigned long flags;
1407
1408        netif_tx_lock_bh(dev);
1409        spin_lock_irqsave(&priv->lock, flags);
1410
1411        while (!list_empty(&priv->cm.reap_list)) {
1412                p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1413                list_del_init(&p->list);
1414                spin_unlock_irqrestore(&priv->lock, flags);
1415                netif_tx_unlock_bh(dev);
1416                ipoib_cm_tx_destroy(p);
1417                netif_tx_lock_bh(dev);
1418                spin_lock_irqsave(&priv->lock, flags);
1419        }
1420
1421        spin_unlock_irqrestore(&priv->lock, flags);
1422        netif_tx_unlock_bh(dev);
1423}
1424
1425static void ipoib_cm_skb_reap(struct work_struct *work)
1426{
1427        struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1428                                                   cm.skb_task);
1429        struct net_device *dev = priv->dev;
1430        struct sk_buff *skb;
1431        unsigned long flags;
1432        unsigned int mtu = priv->mcast_mtu;
1433
1434        netif_tx_lock_bh(dev);
1435        spin_lock_irqsave(&priv->lock, flags);
1436
1437        while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1438                spin_unlock_irqrestore(&priv->lock, flags);
1439                netif_tx_unlock_bh(dev);
1440
1441                if (skb->protocol == htons(ETH_P_IP))
1442                        icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1443#if IS_ENABLED(CONFIG_IPV6)
1444                else if (skb->protocol == htons(ETH_P_IPV6))
1445                        icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1446#endif
1447                dev_kfree_skb_any(skb);
1448
1449                netif_tx_lock_bh(dev);
1450                spin_lock_irqsave(&priv->lock, flags);
1451        }
1452
1453        spin_unlock_irqrestore(&priv->lock, flags);
1454        netif_tx_unlock_bh(dev);
1455}
1456
1457void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1458                           unsigned int mtu)
1459{
1460        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1461        int e = skb_queue_empty(&priv->cm.skb_queue);
1462
1463        skb_dst_update_pmtu(skb, mtu);
1464
1465        skb_queue_tail(&priv->cm.skb_queue, skb);
1466        if (e)
1467                queue_work(priv->wq, &priv->cm.skb_task);
1468}
1469
1470static void ipoib_cm_rx_reap(struct work_struct *work)
1471{
1472        ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1473                                                cm.rx_reap_task)->dev);
1474}
1475
1476static void ipoib_cm_stale_task(struct work_struct *work)
1477{
1478        struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1479                                                   cm.stale_task.work);
1480        struct ipoib_cm_rx *p;
1481        int ret;
1482
1483        spin_lock_irq(&priv->lock);
1484        while (!list_empty(&priv->cm.passive_ids)) {
1485                /* List is sorted by LRU, start from tail,
1486                 * stop when we see a recently used entry */
1487                p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1488                if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1489                        break;
1490                list_move(&p->list, &priv->cm.rx_error_list);
1491                p->state = IPOIB_CM_RX_ERROR;
1492                spin_unlock_irq(&priv->lock);
1493                ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1494                if (ret)
1495                        ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1496                spin_lock_irq(&priv->lock);
1497        }
1498
1499        if (!list_empty(&priv->cm.passive_ids))
1500                queue_delayed_work(priv->wq,
1501                                   &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1502        spin_unlock_irq(&priv->lock);
1503}
1504
1505static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1506                         char *buf)
1507{
1508        struct net_device *dev = to_net_dev(d);
1509        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1510
1511        if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1512                return sprintf(buf, "connected\n");
1513        else
1514                return sprintf(buf, "datagram\n");
1515}
1516
1517static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1518                        const char *buf, size_t count)
1519{
1520        struct net_device *dev = to_net_dev(d);
1521        int ret;
1522
1523        if (!rtnl_trylock()) {
1524                return restart_syscall();
1525        }
1526
1527        if (dev->reg_state != NETREG_REGISTERED) {
1528                rtnl_unlock();
1529                return -EPERM;
1530        }
1531
1532        ret = ipoib_set_mode(dev, buf);
1533
1534        /* The assumption is that the function ipoib_set_mode returned
1535         * with the rtnl held by it, if not the value -EBUSY returned,
1536         * then no need to rtnl_unlock
1537         */
1538        if (ret != -EBUSY)
1539                rtnl_unlock();
1540
1541        return (!ret || ret == -EBUSY) ? count : ret;
1542}
1543
1544static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1545
1546int ipoib_cm_add_mode_attr(struct net_device *dev)
1547{
1548        return device_create_file(&dev->dev, &dev_attr_mode);
1549}
1550
1551static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1552{
1553        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1554        struct ib_srq_init_attr srq_init_attr = {
1555                .srq_type = IB_SRQT_BASIC,
1556                .attr = {
1557                        .max_wr  = ipoib_recvq_size,
1558                        .max_sge = max_sge
1559                }
1560        };
1561
1562        priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1563        if (IS_ERR(priv->cm.srq)) {
1564                if (PTR_ERR(priv->cm.srq) != -EOPNOTSUPP)
1565                        pr_warn("%s: failed to allocate SRQ, error %ld\n",
1566                               priv->ca->name, PTR_ERR(priv->cm.srq));
1567                priv->cm.srq = NULL;
1568                return;
1569        }
1570
1571        priv->cm.srq_ring = vzalloc(array_size(ipoib_recvq_size,
1572                                               sizeof(*priv->cm.srq_ring)));
1573        if (!priv->cm.srq_ring) {
1574                ib_destroy_srq(priv->cm.srq);
1575                priv->cm.srq = NULL;
1576                return;
1577        }
1578
1579}
1580
1581int ipoib_cm_dev_init(struct net_device *dev)
1582{
1583        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1584        int max_srq_sge, i;
1585
1586        INIT_LIST_HEAD(&priv->cm.passive_ids);
1587        INIT_LIST_HEAD(&priv->cm.reap_list);
1588        INIT_LIST_HEAD(&priv->cm.start_list);
1589        INIT_LIST_HEAD(&priv->cm.rx_error_list);
1590        INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1591        INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1592        INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1593        INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1594        INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1595        INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1596        INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1597        INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1598
1599        skb_queue_head_init(&priv->cm.skb_queue);
1600
1601        ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1602
1603        max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1604        ipoib_cm_create_srq(dev, max_srq_sge);
1605        if (ipoib_cm_has_srq(dev)) {
1606                priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1607                priv->cm.num_frags  = max_srq_sge;
1608                ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1609                          priv->cm.max_cm_mtu, priv->cm.num_frags);
1610        } else {
1611                priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1612                priv->cm.num_frags  = IPOIB_CM_RX_SG;
1613        }
1614
1615        ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1616
1617        if (ipoib_cm_has_srq(dev)) {
1618                for (i = 0; i < ipoib_recvq_size; ++i) {
1619                        if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1620                                                   priv->cm.num_frags - 1,
1621                                                   priv->cm.srq_ring[i].mapping,
1622                                                   GFP_KERNEL)) {
1623                                ipoib_warn(priv, "failed to allocate "
1624                                           "receive buffer %d\n", i);
1625                                ipoib_cm_dev_cleanup(dev);
1626                                return -ENOMEM;
1627                        }
1628
1629                        if (ipoib_cm_post_receive_srq(dev, i)) {
1630                                ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1631                                           "failed for buf %d\n", i);
1632                                ipoib_cm_dev_cleanup(dev);
1633                                return -EIO;
1634                        }
1635                }
1636        }
1637
1638        priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1639        return 0;
1640}
1641
1642void ipoib_cm_dev_cleanup(struct net_device *dev)
1643{
1644        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1645        int ret;
1646
1647        if (!priv->cm.srq)
1648                return;
1649
1650        ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1651
1652        ret = ib_destroy_srq(priv->cm.srq);
1653        if (ret)
1654                ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1655
1656        priv->cm.srq = NULL;
1657        if (!priv->cm.srq_ring)
1658                return;
1659
1660        ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1661        priv->cm.srq_ring = NULL;
1662}
1663