cq.c

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/*
 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/mlx4/cq.h>
#include <linux/mlx4/qp.h>
#include <linux/slab.h>

#include "mlx4_ib.h"
#include "user.h"

static void mlx4_ib_cq_comp(struct mlx4_cq *cq)
{
    struct ib_cq *ibcq = &to_mibcq(cq)->ibcq;
    ibcq->comp_handler(ibcq, ibcq->cq_context);
}

static void mlx4_ib_cq_event(struct mlx4_cq *cq, enum mlx4_event type)
{
    struct ib_event event;
    struct ib_cq *ibcq;

    if (type != MLX4_EVENT_TYPE_CQ_ERROR) {
        pr_warn("Unexpected event type %d "
               "on CQ %06x\n", type, cq->cqn);
        return;
    }

    ibcq = &to_mibcq(cq)->ibcq;
    if (ibcq->event_handler) {
        event.device     = ibcq->device;
        event.event      = IB_EVENT_CQ_ERR;
        event.element.cq = ibcq;
        ibcq->event_handler(&event, ibcq->cq_context);
    }
}

static void *get_cqe_from_buf(struct mlx4_ib_cq_buf *buf, int n)
{
    return mlx4_buf_offset(&buf->buf, n * sizeof (struct mlx4_cqe));
}

static void *get_cqe(struct mlx4_ib_cq *cq, int n)
{
    return get_cqe_from_buf(&cq->buf, n);
}

static void *get_sw_cqe(struct mlx4_ib_cq *cq, int n)
{
    struct mlx4_cqe *cqe = get_cqe(cq, n & cq->ibcq.cqe);

    return (!!(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK) ^
        !!(n & (cq->ibcq.cqe + 1))) ? NULL : cqe;
}

static struct mlx4_cqe *next_cqe_sw(struct mlx4_ib_cq *cq)
{
    return get_sw_cqe(cq, cq->mcq.cons_index);
}

int mlx4_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
{
    struct mlx4_ib_cq *mcq = to_mcq(cq);
    struct mlx4_ib_dev *dev = to_mdev(cq->device);

    return mlx4_cq_modify(dev->dev, &mcq->mcq, cq_count, cq_period);
}

static int mlx4_ib_alloc_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int nent)
{
    int err;

    err = mlx4_buf_alloc(dev->dev, nent * sizeof(struct mlx4_cqe),
                 PAGE_SIZE * 2, &buf->buf);

    if (err)
        goto out;

    err = mlx4_mtt_init(dev->dev, buf->buf.npages, buf->buf.page_shift,
                    &buf->mtt);
    if (err)
        goto err_buf;

    err = mlx4_buf_write_mtt(dev->dev, &buf->mtt, &buf->buf);
    if (err)
        goto err_mtt;

    return 0;

err_mtt:
    mlx4_mtt_cleanup(dev->dev, &buf->mtt);

err_buf:
    mlx4_buf_free(dev->dev, nent * sizeof(struct mlx4_cqe),
                  &buf->buf);

out:
    return err;
}

static void mlx4_ib_free_cq_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq_buf *buf, int cqe)
{
    mlx4_buf_free(dev->dev, (cqe + 1) * sizeof(struct mlx4_cqe), &buf->buf);
}

static int mlx4_ib_get_cq_umem(struct mlx4_ib_dev *dev, struct ib_ucontext *context,
                   struct mlx4_ib_cq_buf *buf, struct ib_umem **umem,
                   u64 buf_addr, int cqe)
{
    int err;

    *umem = ib_umem_get(context, buf_addr, cqe * sizeof (struct mlx4_cqe),
                IB_ACCESS_LOCAL_WRITE, 1);
    if (IS_ERR(*umem))
        return PTR_ERR(*umem);

    err = mlx4_mtt_init(dev->dev, ib_umem_page_count(*umem),
                ilog2((*umem)->page_size), &buf->mtt);
    if (err)
        goto err_buf;

    err = mlx4_ib_umem_write_mtt(dev, &buf->mtt, *umem);
    if (err)
        goto err_mtt;

    return 0;

err_mtt:
    mlx4_mtt_cleanup(dev->dev, &buf->mtt);

err_buf:
    ib_umem_release(*umem);

    return err;
}

struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev, int entries, int vector,
                struct ib_ucontext *context,
                struct ib_udata *udata)
{
    struct mlx4_ib_dev *dev = to_mdev(ibdev);
    struct mlx4_ib_cq *cq;
    struct mlx4_uar *uar;
    int err;

    if (entries < 1 || entries > dev->dev->caps.max_cqes)
        return ERR_PTR(-EINVAL);

    cq = kmalloc(sizeof *cq, GFP_KERNEL);
    if (!cq)
        return ERR_PTR(-ENOMEM);

    entries      = roundup_pow_of_two(entries + 1);
    cq->ibcq.cqe = entries - 1;
    mutex_init(&cq->resize_mutex);
    spin_lock_init(&cq->lock);
    cq->resize_buf = NULL;
    cq->resize_umem = NULL;

    if (context) {
        struct mlx4_ib_create_cq ucmd;

        if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
            err = -EFAULT;
            goto err_cq;
        }

        err = mlx4_ib_get_cq_umem(dev, context, &cq->buf, &cq->umem,
                      ucmd.buf_addr, entries);
        if (err)
            goto err_cq;

        err = mlx4_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
                      &cq->db);
        if (err)
            goto err_mtt;

        uar = &to_mucontext(context)->uar;
    } else {
        err = mlx4_db_alloc(dev->dev, &cq->db, 1);
        if (err)
            goto err_cq;

        cq->mcq.set_ci_db  = cq->db.db;
        cq->mcq.arm_db     = cq->db.db + 1;
        *cq->mcq.set_ci_db = 0;
        *cq->mcq.arm_db    = 0;

        err = mlx4_ib_alloc_cq_buf(dev, &cq->buf, entries);
        if (err)
            goto err_db;

        uar = &dev->priv_uar;
    }

    if (dev->eq_table)
        vector = dev->eq_table[vector % ibdev->num_comp_vectors];

    err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
                cq->db.dma, &cq->mcq, vector, 0);
    if (err)
        goto err_dbmap;

    cq->mcq.comp  = mlx4_ib_cq_comp;
    cq->mcq.event = mlx4_ib_cq_event;

    if (context)
        if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
            err = -EFAULT;
            goto err_dbmap;
        }

    return &cq->ibcq;

err_dbmap:
    if (context)
        mlx4_ib_db_unmap_user(to_mucontext(context), &cq->db);

err_mtt:
    mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);

    if (context)
        ib_umem_release(cq->umem);
    else
        mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);

err_db:
    if (!context)
        mlx4_db_free(dev->dev, &cq->db);

err_cq:
    kfree(cq);

    return ERR_PTR(err);
}

static int mlx4_alloc_resize_buf(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
                  int entries)
{
    int err;

    if (cq->resize_buf)
        return -EBUSY;

    cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
    if (!cq->resize_buf)
        return -ENOMEM;

    err = mlx4_ib_alloc_cq_buf(dev, &cq->resize_buf->buf, entries);
    if (err) {
        kfree(cq->resize_buf);
        cq->resize_buf = NULL;
        return err;
    }

    cq->resize_buf->cqe = entries - 1;

    return 0;
}

static int mlx4_alloc_resize_umem(struct mlx4_ib_dev *dev, struct mlx4_ib_cq *cq,
                   int entries, struct ib_udata *udata)
{
    struct mlx4_ib_resize_cq ucmd;
    int err;

    if (cq->resize_umem)
        return -EBUSY;

    if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
        return -EFAULT;

    cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
    if (!cq->resize_buf)
        return -ENOMEM;

    err = mlx4_ib_get_cq_umem(dev, cq->umem->context, &cq->resize_buf->buf,
                  &cq->resize_umem, ucmd.buf_addr, entries);
    if (err) {
        kfree(cq->resize_buf);
        cq->resize_buf = NULL;
        return err;
    }

    cq->resize_buf->cqe = entries - 1;

    return 0;
}

static int mlx4_ib_get_outstanding_cqes(struct mlx4_ib_cq *cq)
{
    u32 i;

    i = cq->mcq.cons_index;
    while (get_sw_cqe(cq, i & cq->ibcq.cqe))
        ++i;

    return i - cq->mcq.cons_index;
}

static void mlx4_ib_cq_resize_copy_cqes(struct mlx4_ib_cq *cq)
{
    struct mlx4_cqe *cqe, *new_cqe;
    int i;

    i = cq->mcq.cons_index;
    cqe = get_cqe(cq, i & cq->ibcq.cqe);
    while ((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) != MLX4_CQE_OPCODE_RESIZE) {
        new_cqe = get_cqe_from_buf(&cq->resize_buf->buf,
                       (i + 1) & cq->resize_buf->cqe);
        memcpy(new_cqe, get_cqe(cq, i & cq->ibcq.cqe), sizeof(struct mlx4_cqe));
        new_cqe->owner_sr_opcode = (cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK) |
            (((i + 1) & (cq->resize_buf->cqe + 1)) ? MLX4_CQE_OWNER_MASK : 0);
        cqe = get_cqe(cq, ++i & cq->ibcq.cqe);
    }
    ++cq->mcq.cons_index;
}

int mlx4_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
{
    struct mlx4_ib_dev *dev = to_mdev(ibcq->device);
    struct mlx4_ib_cq *cq = to_mcq(ibcq);
    struct mlx4_mtt mtt;
    int outst_cqe;
    int err;

    mutex_lock(&cq->resize_mutex);

    if (entries < 1 || entries > dev->dev->caps.max_cqes) {
        err = -EINVAL;
        goto out;
    }

    entries = roundup_pow_of_two(entries + 1);
    if (entries == ibcq->cqe + 1) {
        err = 0;
        goto out;
    }

    if (ibcq->uobject) {
        err = mlx4_alloc_resize_umem(dev, cq, entries, udata);
        if (err)
            goto out;
    } else {
        /* Can't be smaller than the number of outstanding CQEs */
        outst_cqe = mlx4_ib_get_outstanding_cqes(cq);
        if (entries < outst_cqe + 1) {
            err = 0;
            goto out;
        }

        err = mlx4_alloc_resize_buf(dev, cq, entries);
        if (err)
            goto out;
    }

    mtt = cq->buf.mtt;

    err = mlx4_cq_resize(dev->dev, &cq->mcq, entries, &cq->resize_buf->buf.mtt);
    if (err)
        goto err_buf;

    mlx4_mtt_cleanup(dev->dev, &mtt);
    if (ibcq->uobject) {
        cq->buf      = cq->resize_buf->buf;
        cq->ibcq.cqe = cq->resize_buf->cqe;
        ib_umem_release(cq->umem);
        cq->umem     = cq->resize_umem;

        kfree(cq->resize_buf);
        cq->resize_buf = NULL;
        cq->resize_umem = NULL;
    } else {
        struct mlx4_ib_cq_buf tmp_buf;
        int tmp_cqe = 0;

        spin_lock_irq(&cq->lock);
        if (cq->resize_buf) {
            mlx4_ib_cq_resize_copy_cqes(cq);
            tmp_buf = cq->buf;
            tmp_cqe = cq->ibcq.cqe;
            cq->buf      = cq->resize_buf->buf;
            cq->ibcq.cqe = cq->resize_buf->cqe;

            kfree(cq->resize_buf);
            cq->resize_buf = NULL;
        }
        spin_unlock_irq(&cq->lock);

        if (tmp_cqe)
            mlx4_ib_free_cq_buf(dev, &tmp_buf, tmp_cqe);
    }

    goto out;

err_buf:
    mlx4_mtt_cleanup(dev->dev, &cq->resize_buf->buf.mtt);
    if (!ibcq->uobject)
        mlx4_ib_free_cq_buf(dev, &cq->resize_buf->buf,
                    cq->resize_buf->cqe);

    kfree(cq->resize_buf);
    cq->resize_buf = NULL;

    if (cq->resize_umem) {
        ib_umem_release(cq->resize_umem);
        cq->resize_umem = NULL;
    }

out:
    mutex_unlock(&cq->resize_mutex);
    return err;
}

int mlx4_ib_destroy_cq(struct ib_cq *cq)
{
    struct mlx4_ib_dev *dev = to_mdev(cq->device);
    struct mlx4_ib_cq *mcq = to_mcq(cq);

    mlx4_cq_free(dev->dev, &mcq->mcq);
    mlx4_mtt_cleanup(dev->dev, &mcq->buf.mtt);

    if (cq->uobject) {
        mlx4_ib_db_unmap_user(to_mucontext(cq->uobject->context), &mcq->db);
        ib_umem_release(mcq->umem);
    } else {
        mlx4_ib_free_cq_buf(dev, &mcq->buf, cq->cqe);
        mlx4_db_free(dev->dev, &mcq->db);
    }

    kfree(mcq);

    return 0;
}

static void dump_cqe(void *cqe)
{
    __be32 *buf = cqe;

    pr_debug("CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
           be32_to_cpu(buf[0]), be32_to_cpu(buf[1]), be32_to_cpu(buf[2]),
           be32_to_cpu(buf[3]), be32_to_cpu(buf[4]), be32_to_cpu(buf[5]),
           be32_to_cpu(buf[6]), be32_to_cpu(buf[7]));
}

static void mlx4_ib_handle_error_cqe(struct mlx4_err_cqe *cqe,
                     struct ib_wc *wc)
{
    if (cqe->syndrome == MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR) {
        pr_debug("local QP operation err "
               "(QPN %06x, WQE index %x, vendor syndrome %02x, "
               "opcode = %02x)\n",
               be32_to_cpu(cqe->my_qpn), be16_to_cpu(cqe->wqe_index),
               cqe->vendor_err_syndrome,
               cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
        dump_cqe(cqe);
    }

    switch (cqe->syndrome) {
    case MLX4_CQE_SYNDROME_LOCAL_LENGTH_ERR:
        wc->status = IB_WC_LOC_LEN_ERR;
        break;
    case MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR:
        wc->status = IB_WC_LOC_QP_OP_ERR;
        break;
    case MLX4_CQE_SYNDROME_LOCAL_PROT_ERR:
        wc->status = IB_WC_LOC_PROT_ERR;
        break;
    case MLX4_CQE_SYNDROME_WR_FLUSH_ERR:
        wc->status = IB_WC_WR_FLUSH_ERR;
        break;
    case MLX4_CQE_SYNDROME_MW_BIND_ERR:
        wc->status = IB_WC_MW_BIND_ERR;
        break;
    case MLX4_CQE_SYNDROME_BAD_RESP_ERR:
        wc->status = IB_WC_BAD_RESP_ERR;
        break;
    case MLX4_CQE_SYNDROME_LOCAL_ACCESS_ERR:
        wc->status = IB_WC_LOC_ACCESS_ERR;
        break;
    case MLX4_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
        wc->status = IB_WC_REM_INV_REQ_ERR;
        break;
    case MLX4_CQE_SYNDROME_REMOTE_ACCESS_ERR:
        wc->status = IB_WC_REM_ACCESS_ERR;
        break;
    case MLX4_CQE_SYNDROME_REMOTE_OP_ERR:
        wc->status = IB_WC_REM_OP_ERR;
        break;
    case MLX4_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
        wc->status = IB_WC_RETRY_EXC_ERR;
        break;
    case MLX4_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
        wc->status = IB_WC_RNR_RETRY_EXC_ERR;
        break;
    case MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR:
        wc->status = IB_WC_REM_ABORT_ERR;
        break;
    default:
        wc->status = IB_WC_GENERAL_ERR;
        break;
    }

    wc->vendor_err = cqe->vendor_err_syndrome;
}

static int mlx4_ib_ipoib_csum_ok(__be16 status, __be16 checksum)
{
    return ((status & cpu_to_be16(MLX4_CQE_STATUS_IPV4      |
                      MLX4_CQE_STATUS_IPV4F     |
                      MLX4_CQE_STATUS_IPV4OPT   |
                      MLX4_CQE_STATUS_IPV6      |
                      MLX4_CQE_STATUS_IPOK)) ==
        cpu_to_be16(MLX4_CQE_STATUS_IPV4        |
                MLX4_CQE_STATUS_IPOK))              &&
        (status & cpu_to_be16(MLX4_CQE_STATUS_UDP       |
                      MLX4_CQE_STATUS_TCP))     &&
        checksum == cpu_to_be16(0xffff);
}

static int use_tunnel_data(struct mlx4_ib_qp *qp, struct mlx4_ib_cq *cq, struct ib_wc *wc,
               unsigned tail, struct mlx4_cqe *cqe)
{
    struct mlx4_ib_proxy_sqp_hdr *hdr;

    ib_dma_sync_single_for_cpu(qp->ibqp.device,
                   qp->sqp_proxy_rcv[tail].map,
                   sizeof (struct mlx4_ib_proxy_sqp_hdr),
                   DMA_FROM_DEVICE);
    hdr = (struct mlx4_ib_proxy_sqp_hdr *) (qp->sqp_proxy_rcv[tail].addr);
    wc->pkey_index  = be16_to_cpu(hdr->tun.pkey_index);
    wc->slid    = be16_to_cpu(hdr->tun.slid_mac_47_32);
    wc->sl      = (u8) (be16_to_cpu(hdr->tun.sl_vid) >> 12);
    wc->src_qp  = be32_to_cpu(hdr->tun.flags_src_qp) & 0xFFFFFF;
    wc->wc_flags   |= (hdr->tun.g_ml_path & 0x80) ? (IB_WC_GRH) : 0;
    wc->dlid_path_bits = 0;

    return 0;
}

static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
                struct mlx4_ib_qp **cur_qp,
                struct ib_wc *wc)
{
    struct mlx4_cqe *cqe;
    struct mlx4_qp *mqp;
    struct mlx4_ib_wq *wq;
    struct mlx4_ib_srq *srq;
    int is_send;
    int is_error;
    u32 g_mlpath_rqpn;
    u16 wqe_ctr;
    unsigned tail = 0;

repoll:
    cqe = next_cqe_sw(cq);
    if (!cqe)
        return -EAGAIN;

    ++cq->mcq.cons_index;

    /*
     * Make sure we read CQ entry contents after we've checked the
     * ownership bit.
     */
    rmb();

    is_send  = cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK;
    is_error = (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
        MLX4_CQE_OPCODE_ERROR;

    if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_OPCODE_NOP &&
             is_send)) {
        pr_warn("Completion for NOP opcode detected!\n");
        return -EINVAL;
    }

    /* Resize CQ in progress */
    if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == MLX4_CQE_OPCODE_RESIZE)) {
        if (cq->resize_buf) {
            struct mlx4_ib_dev *dev = to_mdev(cq->ibcq.device);

            mlx4_ib_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
            cq->buf      = cq->resize_buf->buf;
            cq->ibcq.cqe = cq->resize_buf->cqe;

            kfree(cq->resize_buf);
            cq->resize_buf = NULL;
        }

        goto repoll;
    }

    if (!*cur_qp ||
        (be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) != (*cur_qp)->mqp.qpn) {
        /*
         * We do not have to take the QP table lock here,
         * because CQs will be locked while QPs are removed
         * from the table.
         */
        mqp = __mlx4_qp_lookup(to_mdev(cq->ibcq.device)->dev,
                       be32_to_cpu(cqe->vlan_my_qpn));
        if (unlikely(!mqp)) {
            pr_warn("CQ %06x with entry for unknown QPN %06x\n",
                   cq->mcq.cqn, be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK);
            return -EINVAL;
        }

        *cur_qp = to_mibqp(mqp);
    }

    wc->qp = &(*cur_qp)->ibqp;

    if (is_send) {
        wq = &(*cur_qp)->sq;
        if (!(*cur_qp)->sq_signal_bits) {
            wqe_ctr = be16_to_cpu(cqe->wqe_index);
            wq->tail += (u16) (wqe_ctr - (u16) wq->tail);
        }
        wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
        ++wq->tail;
    } else if ((*cur_qp)->ibqp.srq) {
        srq = to_msrq((*cur_qp)->ibqp.srq);
        wqe_ctr = be16_to_cpu(cqe->wqe_index);
        wc->wr_id = srq->wrid[wqe_ctr];
        mlx4_ib_free_srq_wqe(srq, wqe_ctr);
    } else {
        wq    = &(*cur_qp)->rq;
        tail      = wq->tail & (wq->wqe_cnt - 1);
        wc->wr_id = wq->wrid[tail];
        ++wq->tail;
    }

    if (unlikely(is_error)) {
        mlx4_ib_handle_error_cqe((struct mlx4_err_cqe *) cqe, wc);
        return 0;
    }

    wc->status = IB_WC_SUCCESS;

    if (is_send) {
        wc->wc_flags = 0;
        switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
        case MLX4_OPCODE_RDMA_WRITE_IMM:
            wc->wc_flags |= IB_WC_WITH_IMM;
        case MLX4_OPCODE_RDMA_WRITE:
            wc->opcode    = IB_WC_RDMA_WRITE;
            break;
        case MLX4_OPCODE_SEND_IMM:
            wc->wc_flags |= IB_WC_WITH_IMM;
        case MLX4_OPCODE_SEND:
        case MLX4_OPCODE_SEND_INVAL:
            wc->opcode    = IB_WC_SEND;
            break;
        case MLX4_OPCODE_RDMA_READ:
            wc->opcode    = IB_WC_RDMA_READ;
            wc->byte_len  = be32_to_cpu(cqe->byte_cnt);
            break;
        case MLX4_OPCODE_ATOMIC_CS:
            wc->opcode    = IB_WC_COMP_SWAP;
            wc->byte_len  = 8;
            break;
        case MLX4_OPCODE_ATOMIC_FA:
            wc->opcode    = IB_WC_FETCH_ADD;
            wc->byte_len  = 8;
            break;
        case MLX4_OPCODE_MASKED_ATOMIC_CS:
            wc->opcode    = IB_WC_MASKED_COMP_SWAP;
            wc->byte_len  = 8;
            break;
        case MLX4_OPCODE_MASKED_ATOMIC_FA:
            wc->opcode    = IB_WC_MASKED_FETCH_ADD;
            wc->byte_len  = 8;
            break;
        case MLX4_OPCODE_BIND_MW:
            wc->opcode    = IB_WC_BIND_MW;
            break;
        case MLX4_OPCODE_LSO:
            wc->opcode    = IB_WC_LSO;
            break;
        case MLX4_OPCODE_FMR:
            wc->opcode    = IB_WC_FAST_REG_MR;
            break;
        case MLX4_OPCODE_LOCAL_INVAL:
            wc->opcode    = IB_WC_LOCAL_INV;
            break;
        }
    } else {
        wc->byte_len = be32_to_cpu(cqe->byte_cnt);

        switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
        case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
            wc->opcode  = IB_WC_RECV_RDMA_WITH_IMM;
            wc->wc_flags    = IB_WC_WITH_IMM;
            wc->ex.imm_data = cqe->immed_rss_invalid;
            break;
        case MLX4_RECV_OPCODE_SEND_INVAL:
            wc->opcode  = IB_WC_RECV;
            wc->wc_flags    = IB_WC_WITH_INVALIDATE;
            wc->ex.invalidate_rkey = be32_to_cpu(cqe->immed_rss_invalid);
            break;
        case MLX4_RECV_OPCODE_SEND:
            wc->opcode   = IB_WC_RECV;
            wc->wc_flags = 0;
            break;
        case MLX4_RECV_OPCODE_SEND_IMM:
            wc->opcode  = IB_WC_RECV;
            wc->wc_flags    = IB_WC_WITH_IMM;
            wc->ex.imm_data = cqe->immed_rss_invalid;
            break;
        }

        if (mlx4_is_mfunc(to_mdev(cq->ibcq.device)->dev)) {
            if ((*cur_qp)->mlx4_ib_qp_type &
                (MLX4_IB_QPT_PROXY_SMI_OWNER |
                 MLX4_IB_QPT_PROXY_SMI | MLX4_IB_QPT_PROXY_GSI))
                return use_tunnel_data(*cur_qp, cq, wc, tail, cqe);
        }

        wc->slid       = be16_to_cpu(cqe->rlid);
        g_mlpath_rqpn      = be32_to_cpu(cqe->g_mlpath_rqpn);
        wc->src_qp     = g_mlpath_rqpn & 0xffffff;
        wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
        wc->wc_flags      |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
        wc->pkey_index     = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
        wc->wc_flags      |= mlx4_ib_ipoib_csum_ok(cqe->status,
                    cqe->checksum) ? IB_WC_IP_CSUM_OK : 0;
        if (rdma_port_get_link_layer(wc->qp->device,
                (*cur_qp)->port) == IB_LINK_LAYER_ETHERNET)
            wc->sl  = be16_to_cpu(cqe->sl_vid) >> 13;
        else
            wc->sl  = be16_to_cpu(cqe->sl_vid) >> 12;
    }

    return 0;
}

int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
{
    struct mlx4_ib_cq *cq = to_mcq(ibcq);
    struct mlx4_ib_qp *cur_qp = NULL;
    unsigned long flags;
    int npolled;
    int err = 0;

    spin_lock_irqsave(&cq->lock, flags);

    for (npolled = 0; npolled < num_entries; ++npolled) {
        err = mlx4_ib_poll_one(cq, &cur_qp, wc + npolled);
        if (err)
            break;
    }

    mlx4_cq_set_ci(&cq->mcq);

    spin_unlock_irqrestore(&cq->lock, flags);

    if (err == 0 || err == -EAGAIN)
        return npolled;
    else
        return err;
}

int mlx4_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
{
    mlx4_cq_arm(&to_mcq(ibcq)->mcq,
            (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
            MLX4_CQ_DB_REQ_NOT_SOL : MLX4_CQ_DB_REQ_NOT,
            to_mdev(ibcq->device)->uar_map,
            MLX4_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->uar_lock));

    return 0;
}

void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
{
    u32 prod_index;
    int nfreed = 0;
    struct mlx4_cqe *cqe, *dest;
    u8 owner_bit;

    /*
     * First we need to find the current producer index, so we
     * know where to start cleaning from.  It doesn't matter if HW
     * adds new entries after this loop -- the QP we're worried
     * about is already in RESET, so the new entries won't come
     * from our QP and therefore don't need to be checked.
     */
    for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); ++prod_index)
        if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
            break;

    /*
     * Now sweep backwards through the CQ, removing CQ entries
     * that match our QP by copying older entries on top of them.
     */
    while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
        cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
        if ((be32_to_cpu(cqe->vlan_my_qpn) & MLX4_CQE_QPN_MASK) == qpn) {
            if (srq && !(cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK))
                mlx4_ib_free_srq_wqe(srq, be16_to_cpu(cqe->wqe_index));
            ++nfreed;
        } else if (nfreed) {
            dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
            owner_bit = dest->owner_sr_opcode & MLX4_CQE_OWNER_MASK;
            memcpy(dest, cqe, sizeof *cqe);
            dest->owner_sr_opcode = owner_bit |
                (dest->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
        }
    }

    if (nfreed) {
        cq->mcq.cons_index += nfreed;
        /*
         * Make sure update of buffer contents is done before
         * updating consumer index.
         */
        wmb();
        mlx4_cq_set_ci(&cq->mcq);
    }
}

void mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
{
    spin_lock_irq(&cq->lock);
    __mlx4_ib_cq_clean(cq, qpn, srq);
    spin_unlock_irq(&cq->lock);
}