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linux-stable-rt/drivers/infiniband/hw/mlx4/cq.c

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/*
* Copyright (c) 2007 Cisco Systems, Inc. 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 "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) {
printk(KERN_WARNING "mlx4_ib: 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;
}
err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
cq->db.dma, &cq->mcq, 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;
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) {
memcpy(get_cqe_from_buf(&cq->resize_buf->buf,
(i + 1) & cq->resize_buf->cqe),
get_cqe(cq, i & cq->ibcq.cqe), sizeof(struct mlx4_cqe));
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);
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 then 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;
}
err = mlx4_cq_resize(dev->dev, &cq->mcq, entries, &cq->resize_buf->buf.mtt);
if (err)
goto err_buf;
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 {
spin_lock_irq(&cq->lock);
if (cq->resize_buf) {
mlx4_ib_cq_resize_copy_cqes(cq);
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;
}
spin_unlock_irq(&cq->lock);
}
goto out;
err_buf:
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;
printk(KERN_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) {
printk(KERN_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(__be32 status, __be16 checksum)
{
return ((status & cpu_to_be32(MLX4_CQE_IPOIB_STATUS_IPV4 |
MLX4_CQE_IPOIB_STATUS_IPV4F |
MLX4_CQE_IPOIB_STATUS_IPV4OPT |
MLX4_CQE_IPOIB_STATUS_IPV6 |
MLX4_CQE_IPOIB_STATUS_IPOK)) ==
cpu_to_be32(MLX4_CQE_IPOIB_STATUS_IPV4 |
MLX4_CQE_IPOIB_STATUS_IPOK)) &&
(status & cpu_to_be32(MLX4_CQE_IPOIB_STATUS_UDP |
MLX4_CQE_IPOIB_STATUS_TCP)) &&
checksum == cpu_to_be16(0xffff);
}
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;
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)) {
printk(KERN_WARNING "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->my_qpn) & 0xffffff) != (*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->my_qpn));
if (unlikely(!mqp)) {
printk(KERN_WARNING "CQ %06x with entry for unknown QPN %06x\n",
cq->mcq.cqn, be32_to_cpu(cqe->my_qpn) & 0xffffff);
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;
wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
++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:
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_BIND_MW:
wc->opcode = IB_WC_BIND_MW;
break;
case MLX4_OPCODE_LSO:
wc->opcode = IB_WC_LSO;
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->imm_data = 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->imm_data = cqe->immed_rss_invalid;
break;
}
wc->slid = be16_to_cpu(cqe->rlid);
wc->sl = cqe->sl >> 4;
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->csum_ok = mlx4_ib_ipoib_csum_ok(cqe->ipoib_status,
cqe->checksum);
}
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;
}
if (npolled)
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->my_qpn) & 0xffffff) == 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);
}
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