linux/drivers/infiniband/ulp/ipoib/ipoib_ib.c
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   1/*
   2 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
   6 *
   7 * This software is available to you under a choice of one of two
   8 * licenses.  You may choose to be licensed under the terms of the GNU
   9 * General Public License (GPL) Version 2, available from the file
  10 * COPYING in the main directory of this source tree, or the
  11 * OpenIB.org BSD license below:
  12 *
  13 *     Redistribution and use in source and binary forms, with or
  14 *     without modification, are permitted provided that the following
  15 *     conditions are met:
  16 *
  17 *      - Redistributions of source code must retain the above
  18 *        copyright notice, this list of conditions and the following
  19 *        disclaimer.
  20 *
  21 *      - Redistributions in binary form must reproduce the above
  22 *        copyright notice, this list of conditions and the following
  23 *        disclaimer in the documentation and/or other materials
  24 *        provided with the distribution.
  25 *
  26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33 * SOFTWARE.
  34 */
  35
  36#include <linux/delay.h>
  37#include <linux/moduleparam.h>
  38#include <linux/dma-mapping.h>
  39#include <linux/slab.h>
  40
  41#include <linux/ip.h>
  42#include <linux/tcp.h>
  43#include <rdma/ib_cache.h>
  44
  45#include "ipoib.h"
  46
  47#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
  48static int data_debug_level;
  49
  50module_param(data_debug_level, int, 0644);
  51MODULE_PARM_DESC(data_debug_level,
  52                 "Enable data path debug tracing if > 0");
  53#endif
  54
  55struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
  56                                 struct ib_pd *pd, struct rdma_ah_attr *attr)
  57{
  58        struct ipoib_ah *ah;
  59        struct ib_ah *vah;
  60
  61        ah = kmalloc(sizeof(*ah), GFP_KERNEL);
  62        if (!ah)
  63                return ERR_PTR(-ENOMEM);
  64
  65        ah->dev       = dev;
  66        ah->last_send = 0;
  67        kref_init(&ah->ref);
  68
  69        vah = rdma_create_ah(pd, attr, RDMA_CREATE_AH_SLEEPABLE);
  70        if (IS_ERR(vah)) {
  71                kfree(ah);
  72                ah = (struct ipoib_ah *)vah;
  73        } else {
  74                ah->ah = vah;
  75                ipoib_dbg(ipoib_priv(dev), "Created ah %p\n", ah->ah);
  76        }
  77
  78        return ah;
  79}
  80
  81void ipoib_free_ah(struct kref *kref)
  82{
  83        struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
  84        struct ipoib_dev_priv *priv = ipoib_priv(ah->dev);
  85
  86        unsigned long flags;
  87
  88        spin_lock_irqsave(&priv->lock, flags);
  89        list_add_tail(&ah->list, &priv->dead_ahs);
  90        spin_unlock_irqrestore(&priv->lock, flags);
  91}
  92
  93static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
  94                                  u64 mapping[IPOIB_UD_RX_SG])
  95{
  96        ib_dma_unmap_single(priv->ca, mapping[0],
  97                            IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
  98                            DMA_FROM_DEVICE);
  99}
 100
 101static int ipoib_ib_post_receive(struct net_device *dev, int id)
 102{
 103        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 104        int ret;
 105
 106        priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
 107        priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
 108        priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
 109
 110
 111        ret = ib_post_recv(priv->qp, &priv->rx_wr, NULL);
 112        if (unlikely(ret)) {
 113                ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 114                ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
 115                dev_kfree_skb_any(priv->rx_ring[id].skb);
 116                priv->rx_ring[id].skb = NULL;
 117        }
 118
 119        return ret;
 120}
 121
 122static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
 123{
 124        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 125        struct sk_buff *skb;
 126        int buf_size;
 127        u64 *mapping;
 128
 129        buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
 130
 131        skb = dev_alloc_skb(buf_size + IPOIB_HARD_LEN);
 132        if (unlikely(!skb))
 133                return NULL;
 134
 135        /*
 136         * the IP header will be at IPOIP_HARD_LEN + IB_GRH_BYTES, that is
 137         * 64 bytes aligned
 138         */
 139        skb_reserve(skb, sizeof(struct ipoib_pseudo_header));
 140
 141        mapping = priv->rx_ring[id].mapping;
 142        mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
 143                                       DMA_FROM_DEVICE);
 144        if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
 145                goto error;
 146
 147        priv->rx_ring[id].skb = skb;
 148        return skb;
 149error:
 150        dev_kfree_skb_any(skb);
 151        return NULL;
 152}
 153
 154static int ipoib_ib_post_receives(struct net_device *dev)
 155{
 156        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 157        int i;
 158
 159        for (i = 0; i < ipoib_recvq_size; ++i) {
 160                if (!ipoib_alloc_rx_skb(dev, i)) {
 161                        ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
 162                        return -ENOMEM;
 163                }
 164                if (ipoib_ib_post_receive(dev, i)) {
 165                        ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
 166                        return -EIO;
 167                }
 168        }
 169
 170        return 0;
 171}
 172
 173static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
 174{
 175        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 176        unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 177        struct sk_buff *skb;
 178        u64 mapping[IPOIB_UD_RX_SG];
 179        union ib_gid *dgid;
 180        union ib_gid *sgid;
 181
 182        ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
 183                       wr_id, wc->status);
 184
 185        if (unlikely(wr_id >= ipoib_recvq_size)) {
 186                ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
 187                           wr_id, ipoib_recvq_size);
 188                return;
 189        }
 190
 191        skb  = priv->rx_ring[wr_id].skb;
 192
 193        if (unlikely(wc->status != IB_WC_SUCCESS)) {
 194                if (wc->status != IB_WC_WR_FLUSH_ERR)
 195                        ipoib_warn(priv,
 196                                   "failed recv event (status=%d, wrid=%d vend_err %#x)\n",
 197                                   wc->status, wr_id, wc->vendor_err);
 198                ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
 199                dev_kfree_skb_any(skb);
 200                priv->rx_ring[wr_id].skb = NULL;
 201                return;
 202        }
 203
 204        memcpy(mapping, priv->rx_ring[wr_id].mapping,
 205               IPOIB_UD_RX_SG * sizeof(*mapping));
 206
 207        /*
 208         * If we can't allocate a new RX buffer, dump
 209         * this packet and reuse the old buffer.
 210         */
 211        if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
 212                ++dev->stats.rx_dropped;
 213                goto repost;
 214        }
 215
 216        ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 217                       wc->byte_len, wc->slid);
 218
 219        ipoib_ud_dma_unmap_rx(priv, mapping);
 220
 221        skb_put(skb, wc->byte_len);
 222
 223        /* First byte of dgid signals multicast when 0xff */
 224        dgid = &((struct ib_grh *)skb->data)->dgid;
 225
 226        if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
 227                skb->pkt_type = PACKET_HOST;
 228        else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
 229                skb->pkt_type = PACKET_BROADCAST;
 230        else
 231                skb->pkt_type = PACKET_MULTICAST;
 232
 233        sgid = &((struct ib_grh *)skb->data)->sgid;
 234
 235        /*
 236         * Drop packets that this interface sent, ie multicast packets
 237         * that the HCA has replicated.
 238         */
 239        if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) {
 240                int need_repost = 1;
 241
 242                if ((wc->wc_flags & IB_WC_GRH) &&
 243                    sgid->global.interface_id != priv->local_gid.global.interface_id)
 244                        need_repost = 0;
 245
 246                if (need_repost) {
 247                        dev_kfree_skb_any(skb);
 248                        goto repost;
 249                }
 250        }
 251
 252        skb_pull(skb, IB_GRH_BYTES);
 253
 254        skb->protocol = ((struct ipoib_header *) skb->data)->proto;
 255        skb_add_pseudo_hdr(skb);
 256
 257        ++dev->stats.rx_packets;
 258        dev->stats.rx_bytes += skb->len;
 259        if (skb->pkt_type == PACKET_MULTICAST)
 260                dev->stats.multicast++;
 261
 262        skb->dev = dev;
 263        if ((dev->features & NETIF_F_RXCSUM) &&
 264                        likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
 265                skb->ip_summed = CHECKSUM_UNNECESSARY;
 266
 267        napi_gro_receive(&priv->recv_napi, skb);
 268
 269repost:
 270        if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
 271                ipoib_warn(priv, "ipoib_ib_post_receive failed "
 272                           "for buf %d\n", wr_id);
 273}
 274
 275int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
 276{
 277        struct sk_buff *skb = tx_req->skb;
 278        u64 *mapping = tx_req->mapping;
 279        int i;
 280        int off;
 281
 282        if (skb_headlen(skb)) {
 283                mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
 284                                               DMA_TO_DEVICE);
 285                if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
 286                        return -EIO;
 287
 288                off = 1;
 289        } else
 290                off = 0;
 291
 292        for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 293                const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 294                mapping[i + off] = ib_dma_map_page(ca,
 295                                                 skb_frag_page(frag),
 296                                                 skb_frag_off(frag),
 297                                                 skb_frag_size(frag),
 298                                                 DMA_TO_DEVICE);
 299                if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
 300                        goto partial_error;
 301        }
 302        return 0;
 303
 304partial_error:
 305        for (; i > 0; --i) {
 306                const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
 307
 308                ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
 309        }
 310
 311        if (off)
 312                ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
 313
 314        return -EIO;
 315}
 316
 317void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
 318                        struct ipoib_tx_buf *tx_req)
 319{
 320        struct sk_buff *skb = tx_req->skb;
 321        u64 *mapping = tx_req->mapping;
 322        int i;
 323        int off;
 324
 325        if (skb_headlen(skb)) {
 326                ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
 327                                    DMA_TO_DEVICE);
 328                off = 1;
 329        } else
 330                off = 0;
 331
 332        for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
 333                const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
 334
 335                ib_dma_unmap_page(priv->ca, mapping[i + off],
 336                                  skb_frag_size(frag), DMA_TO_DEVICE);
 337        }
 338}
 339
 340/*
 341 * As the result of a completion error the QP Can be transferred to SQE states.
 342 * The function checks if the (send)QP is in SQE state and
 343 * moves it back to RTS state, that in order to have it functional again.
 344 */
 345static void ipoib_qp_state_validate_work(struct work_struct *work)
 346{
 347        struct ipoib_qp_state_validate *qp_work =
 348                container_of(work, struct ipoib_qp_state_validate, work);
 349
 350        struct ipoib_dev_priv *priv = qp_work->priv;
 351        struct ib_qp_attr qp_attr;
 352        struct ib_qp_init_attr query_init_attr;
 353        int ret;
 354
 355        ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
 356        if (ret) {
 357                ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
 358                           __func__, ret);
 359                goto free_res;
 360        }
 361        pr_info("%s: QP: 0x%x is in state: %d\n",
 362                __func__, priv->qp->qp_num, qp_attr.qp_state);
 363
 364        /* currently support only in SQE->RTS transition*/
 365        if (qp_attr.qp_state == IB_QPS_SQE) {
 366                qp_attr.qp_state = IB_QPS_RTS;
 367
 368                ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
 369                if (ret) {
 370                        pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
 371                                ret, priv->qp->qp_num);
 372                        goto free_res;
 373                }
 374                pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
 375                        __func__, priv->qp->qp_num);
 376        } else {
 377                pr_warn("QP (%d) will stay in state: %d\n",
 378                        priv->qp->qp_num, qp_attr.qp_state);
 379        }
 380
 381free_res:
 382        kfree(qp_work);
 383}
 384
 385static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
 386{
 387        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 388        unsigned int wr_id = wc->wr_id;
 389        struct ipoib_tx_buf *tx_req;
 390
 391        ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
 392                       wr_id, wc->status);
 393
 394        if (unlikely(wr_id >= ipoib_sendq_size)) {
 395                ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
 396                           wr_id, ipoib_sendq_size);
 397                return;
 398        }
 399
 400        tx_req = &priv->tx_ring[wr_id];
 401
 402        ipoib_dma_unmap_tx(priv, tx_req);
 403
 404        ++dev->stats.tx_packets;
 405        dev->stats.tx_bytes += tx_req->skb->len;
 406
 407        dev_kfree_skb_any(tx_req->skb);
 408
 409        ++priv->tx_tail;
 410        ++priv->global_tx_tail;
 411
 412        if (unlikely(netif_queue_stopped(dev) &&
 413                     ((priv->global_tx_head - priv->global_tx_tail) <=
 414                      ipoib_sendq_size >> 1) &&
 415                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
 416                netif_wake_queue(dev);
 417
 418        if (wc->status != IB_WC_SUCCESS &&
 419            wc->status != IB_WC_WR_FLUSH_ERR) {
 420                struct ipoib_qp_state_validate *qp_work;
 421                ipoib_warn(priv,
 422                           "failed send event (status=%d, wrid=%d vend_err %#x)\n",
 423                           wc->status, wr_id, wc->vendor_err);
 424                qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
 425                if (!qp_work)
 426                        return;
 427
 428                INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
 429                qp_work->priv = priv;
 430                queue_work(priv->wq, &qp_work->work);
 431        }
 432}
 433
 434static int poll_tx(struct ipoib_dev_priv *priv)
 435{
 436        int n, i;
 437        struct ib_wc *wc;
 438
 439        n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 440        for (i = 0; i < n; ++i) {
 441                wc = priv->send_wc + i;
 442                if (wc->wr_id & IPOIB_OP_CM)
 443                        ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i);
 444                else
 445                        ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
 446        }
 447        return n == MAX_SEND_CQE;
 448}
 449
 450int ipoib_rx_poll(struct napi_struct *napi, int budget)
 451{
 452        struct ipoib_dev_priv *priv =
 453                container_of(napi, struct ipoib_dev_priv, recv_napi);
 454        struct net_device *dev = priv->dev;
 455        int done;
 456        int t;
 457        int n, i;
 458
 459        done  = 0;
 460
 461poll_more:
 462        while (done < budget) {
 463                int max = (budget - done);
 464
 465                t = min(IPOIB_NUM_WC, max);
 466                n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
 467
 468                for (i = 0; i < n; i++) {
 469                        struct ib_wc *wc = priv->ibwc + i;
 470
 471                        if (wc->wr_id & IPOIB_OP_RECV) {
 472                                ++done;
 473                                if (wc->wr_id & IPOIB_OP_CM)
 474                                        ipoib_cm_handle_rx_wc(dev, wc);
 475                                else
 476                                        ipoib_ib_handle_rx_wc(dev, wc);
 477                        } else {
 478                                pr_warn("%s: Got unexpected wqe id\n", __func__);
 479                        }
 480                }
 481
 482                if (n != t)
 483                        break;
 484        }
 485
 486        if (done < budget) {
 487                napi_complete(napi);
 488                if (unlikely(ib_req_notify_cq(priv->recv_cq,
 489                                              IB_CQ_NEXT_COMP |
 490                                              IB_CQ_REPORT_MISSED_EVENTS)) &&
 491                    napi_reschedule(napi))
 492                        goto poll_more;
 493        }
 494
 495        return done;
 496}
 497
 498int ipoib_tx_poll(struct napi_struct *napi, int budget)
 499{
 500        struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv,
 501                                                   send_napi);
 502        struct net_device *dev = priv->dev;
 503        int n, i;
 504        struct ib_wc *wc;
 505
 506poll_more:
 507        n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
 508
 509        for (i = 0; i < n; i++) {
 510                wc = priv->send_wc + i;
 511                if (wc->wr_id & IPOIB_OP_CM)
 512                        ipoib_cm_handle_tx_wc(dev, wc);
 513                else
 514                        ipoib_ib_handle_tx_wc(dev, wc);
 515        }
 516
 517        if (n < budget) {
 518                napi_complete(napi);
 519                if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
 520                                              IB_CQ_REPORT_MISSED_EVENTS)) &&
 521                    napi_reschedule(napi))
 522                        goto poll_more;
 523        }
 524        return n < 0 ? 0 : n;
 525}
 526
 527void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr)
 528{
 529        struct ipoib_dev_priv *priv = ctx_ptr;
 530
 531        napi_schedule(&priv->recv_napi);
 532}
 533
 534void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
 535{
 536        struct ipoib_dev_priv *priv = ctx_ptr;
 537
 538        napi_schedule(&priv->send_napi);
 539}
 540
 541static inline int post_send(struct ipoib_dev_priv *priv,
 542                            unsigned int wr_id,
 543                            struct ib_ah *address, u32 dqpn,
 544                            struct ipoib_tx_buf *tx_req,
 545                            void *head, int hlen)
 546{
 547        struct sk_buff *skb = tx_req->skb;
 548
 549        ipoib_build_sge(priv, tx_req);
 550
 551        priv->tx_wr.wr.wr_id    = wr_id;
 552        priv->tx_wr.remote_qpn  = dqpn;
 553        priv->tx_wr.ah          = address;
 554
 555        if (head) {
 556                priv->tx_wr.mss         = skb_shinfo(skb)->gso_size;
 557                priv->tx_wr.header      = head;
 558                priv->tx_wr.hlen        = hlen;
 559                priv->tx_wr.wr.opcode   = IB_WR_LSO;
 560        } else
 561                priv->tx_wr.wr.opcode   = IB_WR_SEND;
 562
 563        return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL);
 564}
 565
 566int ipoib_send(struct net_device *dev, struct sk_buff *skb,
 567               struct ib_ah *address, u32 dqpn)
 568{
 569        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 570        struct ipoib_tx_buf *tx_req;
 571        int hlen, rc;
 572        void *phead;
 573        unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb);
 574
 575        if (skb_is_gso(skb)) {
 576                hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
 577                phead = skb->data;
 578                if (unlikely(!skb_pull(skb, hlen))) {
 579                        ipoib_warn(priv, "linear data too small\n");
 580                        ++dev->stats.tx_dropped;
 581                        ++dev->stats.tx_errors;
 582                        dev_kfree_skb_any(skb);
 583                        return -1;
 584                }
 585        } else {
 586                if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
 587                        ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 588                                   skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
 589                        ++dev->stats.tx_dropped;
 590                        ++dev->stats.tx_errors;
 591                        ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
 592                        return -1;
 593                }
 594                phead = NULL;
 595                hlen  = 0;
 596        }
 597        if (skb_shinfo(skb)->nr_frags > usable_sge) {
 598                if (skb_linearize(skb) < 0) {
 599                        ipoib_warn(priv, "skb could not be linearized\n");
 600                        ++dev->stats.tx_dropped;
 601                        ++dev->stats.tx_errors;
 602                        dev_kfree_skb_any(skb);
 603                        return -1;
 604                }
 605                /* Does skb_linearize return ok without reducing nr_frags? */
 606                if (skb_shinfo(skb)->nr_frags > usable_sge) {
 607                        ipoib_warn(priv, "too many frags after skb linearize\n");
 608                        ++dev->stats.tx_dropped;
 609                        ++dev->stats.tx_errors;
 610                        dev_kfree_skb_any(skb);
 611                        return -1;
 612                }
 613        }
 614
 615        ipoib_dbg_data(priv,
 616                       "sending packet, length=%d address=%p dqpn=0x%06x\n",
 617                       skb->len, address, dqpn);
 618
 619        /*
 620         * We put the skb into the tx_ring _before_ we call post_send()
 621         * because it's entirely possible that the completion handler will
 622         * run before we execute anything after the post_send().  That
 623         * means we have to make sure everything is properly recorded and
 624         * our state is consistent before we call post_send().
 625         */
 626        tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
 627        tx_req->skb = skb;
 628        if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
 629                ++dev->stats.tx_errors;
 630                dev_kfree_skb_any(skb);
 631                return -1;
 632        }
 633
 634        if (skb->ip_summed == CHECKSUM_PARTIAL)
 635                priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
 636        else
 637                priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
 638        /* increase the tx_head after send success, but use it for queue state */
 639        if ((priv->global_tx_head - priv->global_tx_tail) ==
 640            ipoib_sendq_size - 1) {
 641                ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 642                netif_stop_queue(dev);
 643        }
 644
 645        skb_orphan(skb);
 646        skb_dst_drop(skb);
 647
 648        if (netif_queue_stopped(dev))
 649                if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
 650                                     IB_CQ_REPORT_MISSED_EVENTS) < 0)
 651                        ipoib_warn(priv, "request notify on send CQ failed\n");
 652
 653        rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
 654                       address, dqpn, tx_req, phead, hlen);
 655        if (unlikely(rc)) {
 656                ipoib_warn(priv, "post_send failed, error %d\n", rc);
 657                ++dev->stats.tx_errors;
 658                ipoib_dma_unmap_tx(priv, tx_req);
 659                dev_kfree_skb_any(skb);
 660                if (netif_queue_stopped(dev))
 661                        netif_wake_queue(dev);
 662                rc = 0;
 663        } else {
 664                netif_trans_update(dev);
 665
 666                rc = priv->tx_head;
 667                ++priv->tx_head;
 668                ++priv->global_tx_head;
 669        }
 670        return rc;
 671}
 672
 673static void ipoib_reap_dead_ahs(struct ipoib_dev_priv *priv)
 674{
 675        struct ipoib_ah *ah, *tah;
 676        unsigned long flags;
 677
 678        netif_tx_lock_bh(priv->dev);
 679        spin_lock_irqsave(&priv->lock, flags);
 680
 681        list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
 682                if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
 683                        list_del(&ah->list);
 684                        rdma_destroy_ah(ah->ah, 0);
 685                        kfree(ah);
 686                }
 687
 688        spin_unlock_irqrestore(&priv->lock, flags);
 689        netif_tx_unlock_bh(priv->dev);
 690}
 691
 692void ipoib_reap_ah(struct work_struct *work)
 693{
 694        struct ipoib_dev_priv *priv =
 695                container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 696
 697        ipoib_reap_dead_ahs(priv);
 698
 699        if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 700                queue_delayed_work(priv->wq, &priv->ah_reap_task,
 701                                   round_jiffies_relative(HZ));
 702}
 703
 704static void ipoib_start_ah_reaper(struct ipoib_dev_priv *priv)
 705{
 706        clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 707        queue_delayed_work(priv->wq, &priv->ah_reap_task,
 708                           round_jiffies_relative(HZ));
 709}
 710
 711static void ipoib_stop_ah_reaper(struct ipoib_dev_priv *priv)
 712{
 713        set_bit(IPOIB_STOP_REAPER, &priv->flags);
 714        cancel_delayed_work(&priv->ah_reap_task);
 715        /*
 716         * After ipoib_stop_ah_reaper() we always go through
 717         * ipoib_reap_dead_ahs() which ensures the work is really stopped and
 718         * does a final flush out of the dead_ah's list
 719         */
 720}
 721
 722static int recvs_pending(struct net_device *dev)
 723{
 724        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 725        int pending = 0;
 726        int i;
 727
 728        for (i = 0; i < ipoib_recvq_size; ++i)
 729                if (priv->rx_ring[i].skb)
 730                        ++pending;
 731
 732        return pending;
 733}
 734
 735static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
 736                                        struct ib_qp *qp,
 737                                        enum ib_qp_state new_state)
 738{
 739        struct ib_qp_attr qp_attr;
 740        struct ib_qp_init_attr query_init_attr;
 741        int ret;
 742
 743        ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
 744        if (ret) {
 745                ipoib_warn(priv, "%s: Failed to query QP\n", __func__);
 746                return;
 747        }
 748        /* print according to the new-state and the previous state.*/
 749        if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET)
 750                ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n");
 751        else
 752                ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n",
 753                           new_state, qp_attr.qp_state);
 754}
 755
 756static void ipoib_napi_enable(struct net_device *dev)
 757{
 758        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 759
 760        napi_enable(&priv->recv_napi);
 761        napi_enable(&priv->send_napi);
 762}
 763
 764static void ipoib_napi_disable(struct net_device *dev)
 765{
 766        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 767
 768        napi_disable(&priv->recv_napi);
 769        napi_disable(&priv->send_napi);
 770}
 771
 772int ipoib_ib_dev_stop_default(struct net_device *dev)
 773{
 774        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 775        struct ib_qp_attr qp_attr;
 776        unsigned long begin;
 777        struct ipoib_tx_buf *tx_req;
 778        int i;
 779
 780        if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 781                ipoib_napi_disable(dev);
 782
 783        ipoib_cm_dev_stop(dev);
 784
 785        /*
 786         * Move our QP to the error state and then reinitialize in
 787         * when all work requests have completed or have been flushed.
 788         */
 789        qp_attr.qp_state = IB_QPS_ERR;
 790        if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 791                check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
 792
 793        /* Wait for all sends and receives to complete */
 794        begin = jiffies;
 795
 796        while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
 797                if (time_after(jiffies, begin + 5 * HZ)) {
 798                        ipoib_warn(priv,
 799                                   "timing out; %d sends %d receives not completed\n",
 800                                   priv->tx_head - priv->tx_tail,
 801                                   recvs_pending(dev));
 802
 803                        /*
 804                         * assume the HW is wedged and just free up
 805                         * all our pending work requests.
 806                         */
 807                        while ((int)priv->tx_tail - (int)priv->tx_head < 0) {
 808                                tx_req = &priv->tx_ring[priv->tx_tail &
 809                                                        (ipoib_sendq_size - 1)];
 810                                ipoib_dma_unmap_tx(priv, tx_req);
 811                                dev_kfree_skb_any(tx_req->skb);
 812                                ++priv->tx_tail;
 813                                ++priv->global_tx_tail;
 814                        }
 815
 816                        for (i = 0; i < ipoib_recvq_size; ++i) {
 817                                struct ipoib_rx_buf *rx_req;
 818
 819                                rx_req = &priv->rx_ring[i];
 820                                if (!rx_req->skb)
 821                                        continue;
 822                                ipoib_ud_dma_unmap_rx(priv,
 823                                                      priv->rx_ring[i].mapping);
 824                                dev_kfree_skb_any(rx_req->skb);
 825                                rx_req->skb = NULL;
 826                        }
 827
 828                        goto timeout;
 829                }
 830
 831                ipoib_drain_cq(dev);
 832
 833                usleep_range(1000, 2000);
 834        }
 835
 836        ipoib_dbg(priv, "All sends and receives done.\n");
 837
 838timeout:
 839        qp_attr.qp_state = IB_QPS_RESET;
 840        if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
 841                ipoib_warn(priv, "Failed to modify QP to RESET state\n");
 842
 843        ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
 844
 845        return 0;
 846}
 847
 848int ipoib_ib_dev_open_default(struct net_device *dev)
 849{
 850        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 851        int ret;
 852
 853        ret = ipoib_init_qp(dev);
 854        if (ret) {
 855                ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
 856                return -1;
 857        }
 858
 859        ret = ipoib_ib_post_receives(dev);
 860        if (ret) {
 861                ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
 862                goto out;
 863        }
 864
 865        ret = ipoib_cm_dev_open(dev);
 866        if (ret) {
 867                ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
 868                goto out;
 869        }
 870
 871        if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
 872                ipoib_napi_enable(dev);
 873
 874        return 0;
 875out:
 876        return -1;
 877}
 878
 879int ipoib_ib_dev_open(struct net_device *dev)
 880{
 881        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 882
 883        ipoib_pkey_dev_check_presence(dev);
 884
 885        if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 886                ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
 887                           (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
 888                return -1;
 889        }
 890
 891        ipoib_start_ah_reaper(priv);
 892        if (priv->rn_ops->ndo_open(dev)) {
 893                pr_warn("%s: Failed to open dev\n", dev->name);
 894                goto dev_stop;
 895        }
 896
 897        set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 898
 899        return 0;
 900
 901dev_stop:
 902        ipoib_stop_ah_reaper(priv);
 903        return -1;
 904}
 905
 906void ipoib_ib_dev_stop(struct net_device *dev)
 907{
 908        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 909
 910        priv->rn_ops->ndo_stop(dev);
 911
 912        clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
 913        ipoib_stop_ah_reaper(priv);
 914}
 915
 916void ipoib_pkey_dev_check_presence(struct net_device *dev)
 917{
 918        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 919        struct rdma_netdev *rn = netdev_priv(dev);
 920
 921        if (!(priv->pkey & 0x7fff) ||
 922            ib_find_pkey(priv->ca, priv->port, priv->pkey,
 923                         &priv->pkey_index)) {
 924                clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 925        } else {
 926                if (rn->set_id)
 927                        rn->set_id(dev, priv->pkey_index);
 928                set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 929        }
 930}
 931
 932void ipoib_ib_dev_up(struct net_device *dev)
 933{
 934        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 935
 936        ipoib_pkey_dev_check_presence(dev);
 937
 938        if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 939                ipoib_dbg(priv, "PKEY is not assigned.\n");
 940                return;
 941        }
 942
 943        set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 944
 945        ipoib_mcast_start_thread(dev);
 946}
 947
 948void ipoib_ib_dev_down(struct net_device *dev)
 949{
 950        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 951
 952        ipoib_dbg(priv, "downing ib_dev\n");
 953
 954        clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 955        netif_carrier_off(dev);
 956
 957        ipoib_mcast_stop_thread(dev);
 958        ipoib_mcast_dev_flush(dev);
 959
 960        ipoib_flush_paths(dev);
 961}
 962
 963void ipoib_drain_cq(struct net_device *dev)
 964{
 965        struct ipoib_dev_priv *priv = ipoib_priv(dev);
 966        int i, n;
 967
 968        /*
 969         * We call completion handling routines that expect to be
 970         * called from the BH-disabled NAPI poll context, so disable
 971         * BHs here too.
 972         */
 973        local_bh_disable();
 974
 975        do {
 976                n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
 977                for (i = 0; i < n; ++i) {
 978                        /*
 979                         * Convert any successful completions to flush
 980                         * errors to avoid passing packets up the
 981                         * stack after bringing the device down.
 982                         */
 983                        if (priv->ibwc[i].status == IB_WC_SUCCESS)
 984                                priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
 985
 986                        if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
 987                                if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
 988                                        ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
 989                                else
 990                                        ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
 991                        } else {
 992                                pr_warn("%s: Got unexpected wqe id\n", __func__);
 993                        }
 994                }
 995        } while (n == IPOIB_NUM_WC);
 996
 997        while (poll_tx(priv))
 998                ; /* nothing */
 999
1000        local_bh_enable();
1001}
1002
1003/*
1004 * Takes whatever value which is in pkey index 0 and updates priv->pkey
1005 * returns 0 if the pkey value was changed.
1006 */
1007static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
1008{
1009        int result;
1010        u16 prev_pkey;
1011
1012        prev_pkey = priv->pkey;
1013        result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1014        if (result) {
1015                ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
1016                           priv->port, result);
1017                return result;
1018        }
1019
1020        priv->pkey |= 0x8000;
1021
1022        if (prev_pkey != priv->pkey) {
1023                ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
1024                          prev_pkey, priv->pkey);
1025                /*
1026                 * Update the pkey in the broadcast address, while making sure to set
1027                 * the full membership bit, so that we join the right broadcast group.
1028                 */
1029                priv->dev->broadcast[8] = priv->pkey >> 8;
1030                priv->dev->broadcast[9] = priv->pkey & 0xff;
1031                return 0;
1032        }
1033
1034        return 1;
1035}
1036/*
1037 * returns 0 if pkey value was found in a different slot.
1038 */
1039static inline int update_child_pkey(struct ipoib_dev_priv *priv)
1040{
1041        u16 old_index = priv->pkey_index;
1042
1043        priv->pkey_index = 0;
1044        ipoib_pkey_dev_check_presence(priv->dev);
1045
1046        if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
1047            (old_index == priv->pkey_index))
1048                return 1;
1049        return 0;
1050}
1051
1052/*
1053 * returns true if the device address of the ipoib interface has changed and the
1054 * new address is a valid one (i.e in the gid table), return false otherwise.
1055 */
1056static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
1057{
1058        union ib_gid search_gid;
1059        union ib_gid gid0;
1060        int err;
1061        u16 index;
1062        u32 port;
1063        bool ret = false;
1064
1065        if (rdma_query_gid(priv->ca, priv->port, 0, &gid0))
1066                return false;
1067
1068        netif_addr_lock_bh(priv->dev);
1069
1070        /* The subnet prefix may have changed, update it now so we won't have
1071         * to do it later
1072         */
1073        priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1074        dev_addr_mod(priv->dev, 4, (u8 *)&gid0.global.subnet_prefix,
1075                     sizeof(gid0.global.subnet_prefix));
1076        search_gid.global.subnet_prefix = gid0.global.subnet_prefix;
1077
1078        search_gid.global.interface_id = priv->local_gid.global.interface_id;
1079
1080        netif_addr_unlock_bh(priv->dev);
1081
1082        err = ib_find_gid(priv->ca, &search_gid, &port, &index);
1083
1084        netif_addr_lock_bh(priv->dev);
1085
1086        if (search_gid.global.interface_id !=
1087            priv->local_gid.global.interface_id)
1088                /* There was a change while we were looking up the gid, bail
1089                 * here and let the next work sort this out
1090                 */
1091                goto out;
1092
1093        /* The next section of code needs some background:
1094         * Per IB spec the port GUID can't change if the HCA is powered on.
1095         * port GUID is the basis for GID at index 0 which is the basis for
1096         * the default device address of a ipoib interface.
1097         *
1098         * so it seems the flow should be:
1099         * if user_changed_dev_addr && gid in gid tbl
1100         *      set bit dev_addr_set
1101         *      return true
1102         * else
1103         *      return false
1104         *
1105         * The issue is that there are devices that don't follow the spec,
1106         * they change the port GUID when the HCA is powered, so in order
1107         * not to break userspace applications, We need to check if the
1108         * user wanted to control the device address and we assume that
1109         * if he sets the device address back to be based on GID index 0,
1110         * he no longer wishs to control it.
1111         *
1112         * If the user doesn't control the the device address,
1113         * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means
1114         * the port GUID has changed and GID at index 0 has changed
1115         * so we need to change priv->local_gid and priv->dev->dev_addr
1116         * to reflect the new GID.
1117         */
1118        if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
1119                if (!err && port == priv->port) {
1120                        set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1121                        if (index == 0)
1122                                clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
1123                                          &priv->flags);
1124                        else
1125                                set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
1126                        ret = true;
1127                } else {
1128                        ret = false;
1129                }
1130        } else {
1131                if (!err && port == priv->port) {
1132                        ret = true;
1133                } else {
1134                        if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
1135                                memcpy(&priv->local_gid, &gid0,
1136                                       sizeof(priv->local_gid));
1137                                dev_addr_mod(priv->dev, 4, (u8 *)&gid0,
1138                                             sizeof(priv->local_gid));
1139                                ret = true;
1140                        }
1141                }
1142        }
1143
1144out:
1145        netif_addr_unlock_bh(priv->dev);
1146
1147        return ret;
1148}
1149
1150static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
1151                                enum ipoib_flush_level level,
1152                                int nesting)
1153{
1154        struct ipoib_dev_priv *cpriv;
1155        struct net_device *dev = priv->dev;
1156        int result;
1157
1158        down_read_nested(&priv->vlan_rwsem, nesting);
1159
1160        /*
1161         * Flush any child interfaces too -- they might be up even if
1162         * the parent is down.
1163         */
1164        list_for_each_entry(cpriv, &priv->child_intfs, list)
1165                __ipoib_ib_dev_flush(cpriv, level, nesting + 1);
1166
1167        up_read(&priv->vlan_rwsem);
1168
1169        if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
1170            level != IPOIB_FLUSH_HEAVY) {
1171                /* Make sure the dev_addr is set even if not flushing */
1172                if (level == IPOIB_FLUSH_LIGHT)
1173                        ipoib_dev_addr_changed_valid(priv);
1174                ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
1175                return;
1176        }
1177
1178        if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1179                /* interface is down. update pkey and leave. */
1180                if (level == IPOIB_FLUSH_HEAVY) {
1181                        if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1182                                update_parent_pkey(priv);
1183                        else
1184                                update_child_pkey(priv);
1185                } else if (level == IPOIB_FLUSH_LIGHT)
1186                        ipoib_dev_addr_changed_valid(priv);
1187                ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
1188                return;
1189        }
1190
1191        if (level == IPOIB_FLUSH_HEAVY) {
1192                /* child devices chase their origin pkey value, while non-child
1193                 * (parent) devices should always takes what present in pkey index 0
1194                 */
1195                if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1196                        result = update_child_pkey(priv);
1197                        if (result) {
1198                                /* restart QP only if P_Key index is changed */
1199                                ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1200                                return;
1201                        }
1202
1203                } else {
1204                        result = update_parent_pkey(priv);
1205                        /* restart QP only if P_Key value changed */
1206                        if (result) {
1207                                ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1208                                return;
1209                        }
1210                }
1211        }
1212
1213        if (level == IPOIB_FLUSH_LIGHT) {
1214                int oper_up;
1215                ipoib_mark_paths_invalid(dev);
1216                /* Set IPoIB operation as down to prevent races between:
1217                 * the flush flow which leaves MCG and on the fly joins
1218                 * which can happen during that time. mcast restart task
1219                 * should deal with join requests we missed.
1220                 */
1221                oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1222                ipoib_mcast_dev_flush(dev);
1223                if (oper_up)
1224                        set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
1225                ipoib_reap_dead_ahs(priv);
1226        }
1227
1228        if (level >= IPOIB_FLUSH_NORMAL)
1229                ipoib_ib_dev_down(dev);
1230
1231        if (level == IPOIB_FLUSH_HEAVY) {
1232                if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
1233                        ipoib_ib_dev_stop(dev);
1234
1235                if (ipoib_ib_dev_open(dev))
1236                        return;
1237
1238                if (netif_queue_stopped(dev))
1239                        netif_start_queue(dev);
1240        }
1241
1242        /*
1243         * The device could have been brought down between the start and when
1244         * we get here, don't bring it back up if it's not configured up
1245         */
1246        if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1247                if (level >= IPOIB_FLUSH_NORMAL)
1248                        ipoib_ib_dev_up(dev);
1249                if (ipoib_dev_addr_changed_valid(priv))
1250                        ipoib_mcast_restart_task(&priv->restart_task);
1251        }
1252}
1253
1254void ipoib_ib_dev_flush_light(struct work_struct *work)
1255{
1256        struct ipoib_dev_priv *priv =
1257                container_of(work, struct ipoib_dev_priv, flush_light);
1258
1259        __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
1260}
1261
1262void ipoib_ib_dev_flush_normal(struct work_struct *work)
1263{
1264        struct ipoib_dev_priv *priv =
1265                container_of(work, struct ipoib_dev_priv, flush_normal);
1266
1267        __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
1268}
1269
1270void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1271{
1272        struct ipoib_dev_priv *priv =
1273                container_of(work, struct ipoib_dev_priv, flush_heavy);
1274
1275        rtnl_lock();
1276        __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
1277        rtnl_unlock();
1278}
1279
1280void ipoib_ib_dev_cleanup(struct net_device *dev)
1281{
1282        struct ipoib_dev_priv *priv = ipoib_priv(dev);
1283
1284        ipoib_dbg(priv, "cleaning up ib_dev\n");
1285        /*
1286         * We must make sure there are no more (path) completions
1287         * that may wish to touch priv fields that are no longer valid
1288         */
1289        ipoib_flush_paths(dev);
1290
1291        ipoib_mcast_stop_thread(dev);
1292        ipoib_mcast_dev_flush(dev);
1293
1294        /*
1295         * All of our ah references aren't free until after
1296         * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
1297         * the neighbor garbage collection is stopped and reaped.
1298         * That should all be done now, so make a final ah flush.
1299         */
1300        ipoib_reap_dead_ahs(priv);
1301
1302        clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
1303
1304        priv->rn_ops->ndo_uninit(dev);
1305
1306        if (priv->pd) {
1307                ib_dealloc_pd(priv->pd);
1308                priv->pd = NULL;
1309        }
1310}
1311
1312