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android_kernel_motorola_sm6225/drivers/infiniband/hw/mlx4/qp.c
Roland Dreier 59b0ed1212 IB/mlx4: Fix check of opcode in mlx4_ib_post_send() 
wr->opcode is invalid if it's >= ARRAY_SIZE(mlx4_ib_opcode), not just
strictly >.

This was spotted by the Coverity checker (CID 1643).

Signed-off-by: Roland Dreier <rolandd@cisco.com>
2007-05-19 08:51:58 -07:00

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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 <rdma/ib_cache.h>
#include <rdma/ib_pack.h>
#include <linux/mlx4/qp.h>
#include "mlx4_ib.h"
#include "user.h"
enum {
MLX4_IB_ACK_REQ_FREQ = 8,
};
enum {
MLX4_IB_DEFAULT_SCHED_QUEUE = 0x83,
MLX4_IB_DEFAULT_QP0_SCHED_QUEUE = 0x3f
};
enum {
/*
* Largest possible UD header: send with GRH and immediate data.
*/
MLX4_IB_UD_HEADER_SIZE = 72
};
struct mlx4_ib_sqp {
struct mlx4_ib_qp qp;
int pkey_index;
u32 qkey;
u32 send_psn;
struct ib_ud_header ud_header;
u8 header_buf[MLX4_IB_UD_HEADER_SIZE];
};
static const __be32 mlx4_ib_opcode[] = {
[IB_WR_SEND] = __constant_cpu_to_be32(MLX4_OPCODE_SEND),
[IB_WR_SEND_WITH_IMM] = __constant_cpu_to_be32(MLX4_OPCODE_SEND_IMM),
[IB_WR_RDMA_WRITE] = __constant_cpu_to_be32(MLX4_OPCODE_RDMA_WRITE),
[IB_WR_RDMA_WRITE_WITH_IMM] = __constant_cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM),
[IB_WR_RDMA_READ] = __constant_cpu_to_be32(MLX4_OPCODE_RDMA_READ),
[IB_WR_ATOMIC_CMP_AND_SWP] = __constant_cpu_to_be32(MLX4_OPCODE_ATOMIC_CS),
[IB_WR_ATOMIC_FETCH_AND_ADD] = __constant_cpu_to_be32(MLX4_OPCODE_ATOMIC_FA),
};
static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp)
{
return container_of(mqp, struct mlx4_ib_sqp, qp);
}
static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
{
return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
qp->mqp.qpn <= dev->dev->caps.sqp_start + 3;
}
static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
{
return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
qp->mqp.qpn <= dev->dev->caps.sqp_start + 1;
}
static void *get_wqe(struct mlx4_ib_qp *qp, int offset)
{
if (qp->buf.nbufs == 1)
return qp->buf.u.direct.buf + offset;
else
return qp->buf.u.page_list[offset >> PAGE_SHIFT].buf +
(offset & (PAGE_SIZE - 1));
}
static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n)
{
return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift));
}
static void *get_send_wqe(struct mlx4_ib_qp *qp, int n)
{
return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift));
}
static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type)
{
struct ib_event event;
struct ib_qp *ibqp = &to_mibqp(qp)->ibqp;
if (type == MLX4_EVENT_TYPE_PATH_MIG)
to_mibqp(qp)->port = to_mibqp(qp)->alt_port;
if (ibqp->event_handler) {
event.device = ibqp->device;
event.element.qp = ibqp;
switch (type) {
case MLX4_EVENT_TYPE_PATH_MIG:
event.event = IB_EVENT_PATH_MIG;
break;
case MLX4_EVENT_TYPE_COMM_EST:
event.event = IB_EVENT_COMM_EST;
break;
case MLX4_EVENT_TYPE_SQ_DRAINED:
event.event = IB_EVENT_SQ_DRAINED;
break;
case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE:
event.event = IB_EVENT_QP_LAST_WQE_REACHED;
break;
case MLX4_EVENT_TYPE_WQ_CATAS_ERROR:
event.event = IB_EVENT_QP_FATAL;
break;
case MLX4_EVENT_TYPE_PATH_MIG_FAILED:
event.event = IB_EVENT_PATH_MIG_ERR;
break;
case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
event.event = IB_EVENT_QP_REQ_ERR;
break;
case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR:
event.event = IB_EVENT_QP_ACCESS_ERR;
break;
default:
printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
"on QP %06x\n", type, qp->qpn);
return;
}
ibqp->event_handler(&event, ibqp->qp_context);
}
}
static int send_wqe_overhead(enum ib_qp_type type)
{
/*
* UD WQEs must have a datagram segment.
* RC and UC WQEs might have a remote address segment.
* MLX WQEs need two extra inline data segments (for the UD
* header and space for the ICRC).
*/
switch (type) {
case IB_QPT_UD:
return sizeof (struct mlx4_wqe_ctrl_seg) +
sizeof (struct mlx4_wqe_datagram_seg);
case IB_QPT_UC:
return sizeof (struct mlx4_wqe_ctrl_seg) +
sizeof (struct mlx4_wqe_raddr_seg);
case IB_QPT_RC:
return sizeof (struct mlx4_wqe_ctrl_seg) +
sizeof (struct mlx4_wqe_atomic_seg) +
sizeof (struct mlx4_wqe_raddr_seg);
case IB_QPT_SMI:
case IB_QPT_GSI:
return sizeof (struct mlx4_wqe_ctrl_seg) +
ALIGN(MLX4_IB_UD_HEADER_SIZE +
sizeof (struct mlx4_wqe_inline_seg),
sizeof (struct mlx4_wqe_data_seg)) +
ALIGN(4 +
sizeof (struct mlx4_wqe_inline_seg),
sizeof (struct mlx4_wqe_data_seg));
default:
return sizeof (struct mlx4_wqe_ctrl_seg);
}
}
static int set_qp_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
enum ib_qp_type type, struct mlx4_ib_qp *qp)
{
/* Sanity check QP size before proceeding */
if (cap->max_send_wr > dev->dev->caps.max_wqes ||
cap->max_recv_wr > dev->dev->caps.max_wqes ||
cap->max_send_sge > dev->dev->caps.max_sq_sg ||
cap->max_recv_sge > dev->dev->caps.max_rq_sg ||
cap->max_inline_data + send_wqe_overhead(type) +
sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz)
return -EINVAL;
/*
* For MLX transport we need 2 extra S/G entries:
* one for the header and one for the checksum at the end
*/
if ((type == IB_QPT_SMI || type == IB_QPT_GSI) &&
cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg)
return -EINVAL;
qp->rq.max = cap->max_recv_wr ? roundup_pow_of_two(cap->max_recv_wr) : 0;
qp->sq.max = cap->max_send_wr ? roundup_pow_of_two(cap->max_send_wr) : 0;
qp->rq.wqe_shift = ilog2(roundup_pow_of_two(cap->max_recv_sge *
sizeof (struct mlx4_wqe_data_seg)));
qp->rq.max_gs = (1 << qp->rq.wqe_shift) / sizeof (struct mlx4_wqe_data_seg);
qp->sq.wqe_shift = ilog2(roundup_pow_of_two(max(cap->max_send_sge *
sizeof (struct mlx4_wqe_data_seg),
cap->max_inline_data +
sizeof (struct mlx4_wqe_inline_seg)) +
send_wqe_overhead(type)));
qp->sq.max_gs = ((1 << qp->sq.wqe_shift) - send_wqe_overhead(type)) /
sizeof (struct mlx4_wqe_data_seg);
qp->buf_size = (qp->rq.max << qp->rq.wqe_shift) +
(qp->sq.max << qp->sq.wqe_shift);
if (qp->rq.wqe_shift > qp->sq.wqe_shift) {
qp->rq.offset = 0;
qp->sq.offset = qp->rq.max << qp->rq.wqe_shift;
} else {
qp->rq.offset = qp->sq.max << qp->sq.wqe_shift;
qp->sq.offset = 0;
}
cap->max_send_wr = qp->sq.max;
cap->max_recv_wr = qp->rq.max;
cap->max_send_sge = qp->sq.max_gs;
cap->max_recv_sge = qp->rq.max_gs;
cap->max_inline_data = (1 << qp->sq.wqe_shift) - send_wqe_overhead(type) -
sizeof (struct mlx4_wqe_inline_seg);
return 0;
}
static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
struct ib_qp_init_attr *init_attr,
struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp)
{
struct mlx4_wqe_ctrl_seg *ctrl;
int err;
int i;
mutex_init(&qp->mutex);
spin_lock_init(&qp->sq.lock);
spin_lock_init(&qp->rq.lock);
qp->state = IB_QPS_RESET;
qp->atomic_rd_en = 0;
qp->resp_depth = 0;
qp->rq.head = 0;
qp->rq.tail = 0;
qp->sq.head = 0;
qp->sq.tail = 0;
err = set_qp_size(dev, &init_attr->cap, init_attr->qp_type, qp);
if (err)
goto err;
if (pd->uobject) {
struct mlx4_ib_create_qp ucmd;
if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
err = -EFAULT;
goto err;
}
qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
qp->buf_size, 0);
if (IS_ERR(qp->umem)) {
err = PTR_ERR(qp->umem);
goto err;
}
err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem),
ilog2(qp->umem->page_size), &qp->mtt);
if (err)
goto err_buf;
err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem);
if (err)
goto err_mtt;
err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
ucmd.db_addr, &qp->db);
if (err)
goto err_mtt;
} else {
err = mlx4_ib_db_alloc(dev, &qp->db, 0);
if (err)
goto err;
*qp->db.db = 0;
if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) {
err = -ENOMEM;
goto err_db;
}
err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift,
&qp->mtt);
if (err)
goto err_buf;
err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf);
if (err)
goto err_mtt;
for (i = 0; i < qp->sq.max; ++i) {
ctrl = get_send_wqe(qp, i);
ctrl->owner_opcode = cpu_to_be32(1 << 31);
}
qp->sq.wrid = kmalloc(qp->sq.max * sizeof (u64), GFP_KERNEL);
qp->rq.wrid = kmalloc(qp->rq.max * sizeof (u64), GFP_KERNEL);
if (!qp->sq.wrid || !qp->rq.wrid) {
err = -ENOMEM;
goto err_wrid;
}
/* We don't support inline sends for kernel QPs (yet) */
init_attr->cap.max_inline_data = 0;
}
err = mlx4_qp_alloc(dev->dev, sqpn, &qp->mqp);
if (err)
goto err_wrid;
/*
* Hardware wants QPN written in big-endian order (after
* shifting) for send doorbell. Precompute this value to save
* a little bit when posting sends.
*/
qp->doorbell_qpn = swab32(qp->mqp.qpn << 8);
if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
else
qp->sq_signal_bits = 0;
qp->mqp.event = mlx4_ib_qp_event;
return 0;
err_wrid:
if (pd->uobject)
mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &qp->db);
else {
kfree(qp->sq.wrid);
kfree(qp->rq.wrid);
}
err_mtt:
mlx4_mtt_cleanup(dev->dev, &qp->mtt);
err_buf:
if (pd->uobject)
ib_umem_release(qp->umem);
else
mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
err_db:
if (!pd->uobject)
mlx4_ib_db_free(dev, &qp->db);
err:
return err;
}
static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state)
{
switch (state) {
case IB_QPS_RESET: return MLX4_QP_STATE_RST;
case IB_QPS_INIT: return MLX4_QP_STATE_INIT;
case IB_QPS_RTR: return MLX4_QP_STATE_RTR;
case IB_QPS_RTS: return MLX4_QP_STATE_RTS;
case IB_QPS_SQD: return MLX4_QP_STATE_SQD;
case IB_QPS_SQE: return MLX4_QP_STATE_SQER;
case IB_QPS_ERR: return MLX4_QP_STATE_ERR;
default: return -1;
}
}
static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
{
if (send_cq == recv_cq)
spin_lock_irq(&send_cq->lock);
else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
spin_lock_irq(&send_cq->lock);
spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
} else {
spin_lock_irq(&recv_cq->lock);
spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
}
}
static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
{
if (send_cq == recv_cq)
spin_unlock_irq(&send_cq->lock);
else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
spin_unlock(&recv_cq->lock);
spin_unlock_irq(&send_cq->lock);
} else {
spin_unlock(&send_cq->lock);
spin_unlock_irq(&recv_cq->lock);
}
}
static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
int is_user)
{
struct mlx4_ib_cq *send_cq, *recv_cq;
if (qp->state != IB_QPS_RESET)
if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state),
MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp))
printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n",
qp->mqp.qpn);
send_cq = to_mcq(qp->ibqp.send_cq);
recv_cq = to_mcq(qp->ibqp.recv_cq);
mlx4_ib_lock_cqs(send_cq, recv_cq);
if (!is_user) {
__mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL);
if (send_cq != recv_cq)
__mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
}
mlx4_qp_remove(dev->dev, &qp->mqp);
mlx4_ib_unlock_cqs(send_cq, recv_cq);
mlx4_qp_free(dev->dev, &qp->mqp);
mlx4_mtt_cleanup(dev->dev, &qp->mtt);
if (is_user) {
mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context),
&qp->db);
ib_umem_release(qp->umem);
} else {
kfree(qp->sq.wrid);
kfree(qp->rq.wrid);
mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
mlx4_ib_db_free(dev, &qp->db);
}
}
struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
struct ib_qp_init_attr *init_attr,
struct ib_udata *udata)
{
struct mlx4_ib_dev *dev = to_mdev(pd->device);
struct mlx4_ib_sqp *sqp;
struct mlx4_ib_qp *qp;
int err;
switch (init_attr->qp_type) {
case IB_QPT_RC:
case IB_QPT_UC:
case IB_QPT_UD:
{
qp = kmalloc(sizeof *qp, GFP_KERNEL);
if (!qp)
return ERR_PTR(-ENOMEM);
err = create_qp_common(dev, pd, init_attr, udata, 0, qp);
if (err) {
kfree(qp);
return ERR_PTR(err);
}
qp->ibqp.qp_num = qp->mqp.qpn;
break;
}
case IB_QPT_SMI:
case IB_QPT_GSI:
{
/* Userspace is not allowed to create special QPs: */
if (pd->uobject)
return ERR_PTR(-EINVAL);
sqp = kmalloc(sizeof *sqp, GFP_KERNEL);
if (!sqp)
return ERR_PTR(-ENOMEM);
qp = &sqp->qp;
err = create_qp_common(dev, pd, init_attr, udata,
dev->dev->caps.sqp_start +
(init_attr->qp_type == IB_QPT_SMI ? 0 : 2) +
init_attr->port_num - 1,
qp);
if (err) {
kfree(sqp);
return ERR_PTR(err);
}
qp->port = init_attr->port_num;
qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1;
break;
}
default:
/* Don't support raw QPs */
return ERR_PTR(-EINVAL);
}
return &qp->ibqp;
}
int mlx4_ib_destroy_qp(struct ib_qp *qp)
{
struct mlx4_ib_dev *dev = to_mdev(qp->device);
struct mlx4_ib_qp *mqp = to_mqp(qp);
if (is_qp0(dev, mqp))
mlx4_CLOSE_PORT(dev->dev, mqp->port);
destroy_qp_common(dev, mqp, !!qp->pd->uobject);
if (is_sqp(dev, mqp))
kfree(to_msqp(mqp));
else
kfree(mqp);
return 0;
}
static void init_port(struct mlx4_ib_dev *dev, int port)
{
struct mlx4_init_port_param param;
int err;
memset(&param, 0, sizeof param);
param.port_width_cap = dev->dev->caps.port_width_cap;
param.vl_cap = dev->dev->caps.vl_cap;
param.mtu = ib_mtu_enum_to_int(dev->dev->caps.mtu_cap);
param.max_gid = dev->dev->caps.gid_table_len;
param.max_pkey = dev->dev->caps.pkey_table_len;
err = mlx4_INIT_PORT(dev->dev, &param, port);
if (err)
printk(KERN_WARNING "INIT_PORT failed, return code %d.\n", err);
}
static int to_mlx4_st(enum ib_qp_type type)
{
switch (type) {
case IB_QPT_RC: return MLX4_QP_ST_RC;
case IB_QPT_UC: return MLX4_QP_ST_UC;
case IB_QPT_UD: return MLX4_QP_ST_UD;
case IB_QPT_SMI:
case IB_QPT_GSI: return MLX4_QP_ST_MLX;
default: return -1;
}
}
static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr,
int attr_mask)
{
u8 dest_rd_atomic;
u32 access_flags;
u32 hw_access_flags = 0;
if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
dest_rd_atomic = attr->max_dest_rd_atomic;
else
dest_rd_atomic = qp->resp_depth;
if (attr_mask & IB_QP_ACCESS_FLAGS)
access_flags = attr->qp_access_flags;
else
access_flags = qp->atomic_rd_en;
if (!dest_rd_atomic)
access_flags &= IB_ACCESS_REMOTE_WRITE;
if (access_flags & IB_ACCESS_REMOTE_READ)
hw_access_flags |= MLX4_QP_BIT_RRE;
if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
hw_access_flags |= MLX4_QP_BIT_RAE;
if (access_flags & IB_ACCESS_REMOTE_WRITE)
hw_access_flags |= MLX4_QP_BIT_RWE;
return cpu_to_be32(hw_access_flags);
}
static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr,
int attr_mask)
{
if (attr_mask & IB_QP_PKEY_INDEX)
sqp->pkey_index = attr->pkey_index;
if (attr_mask & IB_QP_QKEY)
sqp->qkey = attr->qkey;
if (attr_mask & IB_QP_SQ_PSN)
sqp->send_psn = attr->sq_psn;
}
static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port)
{
path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6);
}
static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah,
struct mlx4_qp_path *path, u8 port)
{
path->grh_mylmc = ah->src_path_bits & 0x7f;
path->rlid = cpu_to_be16(ah->dlid);
if (ah->static_rate) {
path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET;
while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
!(1 << path->static_rate & dev->dev->caps.stat_rate_support))
--path->static_rate;
} else
path->static_rate = 0;
path->counter_index = 0xff;
if (ah->ah_flags & IB_AH_GRH) {
if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len) {
printk(KERN_ERR "sgid_index (%u) too large. max is %d\n",
ah->grh.sgid_index, dev->dev->caps.gid_table_len - 1);
return -1;
}
path->grh_mylmc |= 1 << 7;
path->mgid_index = ah->grh.sgid_index;
path->hop_limit = ah->grh.hop_limit;
path->tclass_flowlabel =
cpu_to_be32((ah->grh.traffic_class << 20) |
(ah->grh.flow_label));
memcpy(path->rgid, ah->grh.dgid.raw, 16);
}
path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
((port - 1) << 6) | ((ah->sl & 0xf) << 2);
return 0;
}
static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
const struct ib_qp_attr *attr, int attr_mask,
enum ib_qp_state cur_state, enum ib_qp_state new_state)
{
struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
struct mlx4_ib_qp *qp = to_mqp(ibqp);
struct mlx4_qp_context *context;
enum mlx4_qp_optpar optpar = 0;
int sqd_event;
int err = -EINVAL;
context = kzalloc(sizeof *context, GFP_KERNEL);
if (!context)
return -ENOMEM;
context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) |
(to_mlx4_st(ibqp->qp_type) << 16));
context->flags |= cpu_to_be32(1 << 8); /* DE? */
if (!(attr_mask & IB_QP_PATH_MIG_STATE))
context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
else {
optpar |= MLX4_QP_OPTPAR_PM_STATE;
switch (attr->path_mig_state) {
case IB_MIG_MIGRATED:
context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
break;
case IB_MIG_REARM:
context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11);
break;
case IB_MIG_ARMED:
context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11);
break;
}
}
if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
ibqp->qp_type == IB_QPT_UD)
context->mtu_msgmax = (IB_MTU_4096 << 5) | 11;
else if (attr_mask & IB_QP_PATH_MTU) {
if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
printk(KERN_ERR "path MTU (%u) is invalid\n",
attr->path_mtu);
return -EINVAL;
}
context->mtu_msgmax = (attr->path_mtu << 5) | 31;
}
if (qp->rq.max)
context->rq_size_stride = ilog2(qp->rq.max) << 3;
context->rq_size_stride |= qp->rq.wqe_shift - 4;
if (qp->sq.max)
context->sq_size_stride = ilog2(qp->sq.max) << 3;
context->sq_size_stride |= qp->sq.wqe_shift - 4;
if (qp->ibqp.uobject)
context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
else
context->usr_page = cpu_to_be32(dev->priv_uar.index);
if (attr_mask & IB_QP_DEST_QPN)
context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
if (attr_mask & IB_QP_PORT) {
if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD &&
!(attr_mask & IB_QP_AV)) {
mlx4_set_sched(&context->pri_path, attr->port_num);
optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE;
}
}
if (attr_mask & IB_QP_PKEY_INDEX) {
context->pri_path.pkey_index = attr->pkey_index;
optpar |= MLX4_QP_OPTPAR_PKEY_INDEX;
}
if (attr_mask & IB_QP_RNR_RETRY) {
context->params1 |= cpu_to_be32(attr->rnr_retry << 13);
optpar |= MLX4_QP_OPTPAR_RNR_RETRY;
}
if (attr_mask & IB_QP_AV) {
if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path,
attr_mask & IB_QP_PORT ? attr->port_num : qp->port)) {
err = -EINVAL;
goto out;
}
optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH |
MLX4_QP_OPTPAR_SCHED_QUEUE);
}
if (attr_mask & IB_QP_TIMEOUT) {
context->pri_path.ackto = attr->timeout << 3;
optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT;
}
if (attr_mask & IB_QP_ALT_PATH) {
if (attr->alt_pkey_index >= dev->dev->caps.pkey_table_len)
return -EINVAL;
if (attr->alt_port_num == 0 ||
attr->alt_port_num > dev->dev->caps.num_ports)
return -EINVAL;
if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path,
attr->alt_port_num))
return -EINVAL;
context->alt_path.pkey_index = attr->alt_pkey_index;
context->alt_path.ackto = attr->alt_timeout << 3;
optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH;
}
context->pd = cpu_to_be32(to_mpd(ibqp->pd)->pdn);
context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28);
if (attr_mask & IB_QP_RETRY_CNT) {
context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
optpar |= MLX4_QP_OPTPAR_RETRY_COUNT;
}
if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
if (attr->max_rd_atomic)
context->params1 |=
cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
optpar |= MLX4_QP_OPTPAR_SRA_MAX;
}
if (attr_mask & IB_QP_SQ_PSN)
context->next_send_psn = cpu_to_be32(attr->sq_psn);
context->cqn_send = cpu_to_be32(to_mcq(ibqp->send_cq)->mcq.cqn);
if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
if (attr->max_dest_rd_atomic)
context->params2 |=
cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
optpar |= MLX4_QP_OPTPAR_RRA_MAX;
}
if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask);
optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE;
}
if (ibqp->srq)
context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC);
if (attr_mask & IB_QP_MIN_RNR_TIMER) {
context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT;
}
if (attr_mask & IB_QP_RQ_PSN)
context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
context->cqn_recv = cpu_to_be32(to_mcq(ibqp->recv_cq)->mcq.cqn);
if (attr_mask & IB_QP_QKEY) {
context->qkey = cpu_to_be32(attr->qkey);
optpar |= MLX4_QP_OPTPAR_Q_KEY;
}
if (ibqp->srq)
context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn);
if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
context->db_rec_addr = cpu_to_be64(qp->db.dma);
if (cur_state == IB_QPS_INIT &&
new_state == IB_QPS_RTR &&
(ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
ibqp->qp_type == IB_QPT_UD)) {
context->pri_path.sched_queue = (qp->port - 1) << 6;
if (is_qp0(dev, qp))
context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE;
else
context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE;
}
if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD &&
attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify)
sqd_event = 1;
else
sqd_event = 0;
err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state),
to_mlx4_state(new_state), context, optpar,
sqd_event, &qp->mqp);
if (err)
goto out;
qp->state = new_state;
if (attr_mask & IB_QP_ACCESS_FLAGS)
qp->atomic_rd_en = attr->qp_access_flags;
if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
qp->resp_depth = attr->max_dest_rd_atomic;
if (attr_mask & IB_QP_PORT)
qp->port = attr->port_num;
if (attr_mask & IB_QP_ALT_PATH)
qp->alt_port = attr->alt_port_num;
if (is_sqp(dev, qp))
store_sqp_attrs(to_msqp(qp), attr, attr_mask);
/*
* If we moved QP0 to RTR, bring the IB link up; if we moved
* QP0 to RESET or ERROR, bring the link back down.
*/
if (is_qp0(dev, qp)) {
if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR)
init_port(dev, qp->port);
if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR &&
(new_state == IB_QPS_RESET || new_state == IB_QPS_ERR))
mlx4_CLOSE_PORT(dev->dev, qp->port);
}
/*
* If we moved a kernel QP to RESET, clean up all old CQ
* entries and reinitialize the QP.
*/
if (new_state == IB_QPS_RESET && !ibqp->uobject) {
mlx4_ib_cq_clean(to_mcq(ibqp->recv_cq), qp->mqp.qpn,
ibqp->srq ? to_msrq(ibqp->srq): NULL);
if (ibqp->send_cq != ibqp->recv_cq)
mlx4_ib_cq_clean(to_mcq(ibqp->send_cq), qp->mqp.qpn, NULL);
qp->rq.head = 0;
qp->rq.tail = 0;
qp->sq.head = 0;
qp->sq.tail = 0;
*qp->db.db = 0;
}
out:
kfree(context);
return err;
}
static const struct ib_qp_attr mlx4_ib_qp_attr = { .port_num = 1 };
static const int mlx4_ib_qp_attr_mask_table[IB_QPT_UD + 1] = {
[IB_QPT_UD] = (IB_QP_PKEY_INDEX |
IB_QP_PORT |
IB_QP_QKEY),
[IB_QPT_UC] = (IB_QP_PKEY_INDEX |
IB_QP_PORT |
IB_QP_ACCESS_FLAGS),
[IB_QPT_RC] = (IB_QP_PKEY_INDEX |
IB_QP_PORT |
IB_QP_ACCESS_FLAGS),
[IB_QPT_SMI] = (IB_QP_PKEY_INDEX |
IB_QP_QKEY),
[IB_QPT_GSI] = (IB_QP_PKEY_INDEX |
IB_QP_QKEY),
};
int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
int attr_mask, struct ib_udata *udata)
{
struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
struct mlx4_ib_qp *qp = to_mqp(ibqp);
enum ib_qp_state cur_state, new_state;
int err = -EINVAL;
mutex_lock(&qp->mutex);
cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state;
new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask))
goto out;
if ((attr_mask & IB_QP_PKEY_INDEX) &&
attr->pkey_index >= dev->dev->caps.pkey_table_len) {
goto out;
}
if ((attr_mask & IB_QP_PORT) &&
(attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) {
goto out;
}
if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) {
goto out;
}
if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) {
goto out;
}
if (cur_state == new_state && cur_state == IB_QPS_RESET) {
err = 0;
goto out;
}
if (cur_state == IB_QPS_RESET && new_state == IB_QPS_ERR) {
err = __mlx4_ib_modify_qp(ibqp, &mlx4_ib_qp_attr,
mlx4_ib_qp_attr_mask_table[ibqp->qp_type],
IB_QPS_RESET, IB_QPS_INIT);
if (err)
goto out;
cur_state = IB_QPS_INIT;
}
err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state);
out:
mutex_unlock(&qp->mutex);
return err;
}
static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
void *wqe)
{
struct ib_device *ib_dev = &to_mdev(sqp->qp.ibqp.device)->ib_dev;
struct mlx4_wqe_mlx_seg *mlx = wqe;
struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx;
struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
u16 pkey;
int send_size;
int header_size;
int i;
send_size = 0;
for (i = 0; i < wr->num_sge; ++i)
send_size += wr->sg_list[i].length;
ib_ud_header_init(send_size, mlx4_ib_ah_grh_present(ah), &sqp->ud_header);
sqp->ud_header.lrh.service_level =
be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 28;
sqp->ud_header.lrh.destination_lid = ah->av.dlid;
sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.g_slid & 0x7f);
if (mlx4_ib_ah_grh_present(ah)) {
sqp->ud_header.grh.traffic_class =
(be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 20) & 0xff;
sqp->ud_header.grh.flow_label =
ah->av.sl_tclass_flowlabel & cpu_to_be32(0xfffff);
sqp->ud_header.grh.hop_limit = ah->av.hop_limit;
ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.port_pd) >> 24,
ah->av.gid_index, &sqp->ud_header.grh.source_gid);
memcpy(sqp->ud_header.grh.destination_gid.raw,
ah->av.dgid, 16);
}
mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) |
(sqp->ud_header.lrh.destination_lid ==
IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) |
(sqp->ud_header.lrh.service_level << 8));
mlx->rlid = sqp->ud_header.lrh.destination_lid;
switch (wr->opcode) {
case IB_WR_SEND:
sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY;
sqp->ud_header.immediate_present = 0;
break;
case IB_WR_SEND_WITH_IMM:
sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
sqp->ud_header.immediate_present = 1;
sqp->ud_header.immediate_data = wr->imm_data;
break;
default:
return -EINVAL;
}
sqp->ud_header.lrh.virtual_lane = !sqp->qp.ibqp.qp_num ? 15 : 0;
if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
if (!sqp->qp.ibqp.qp_num)
ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey);
else
ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey);
sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
sqp->qkey : wr->wr.ud.remote_qkey);
sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf);
if (0) {
printk(KERN_ERR "built UD header of size %d:\n", header_size);
for (i = 0; i < header_size / 4; ++i) {
if (i % 8 == 0)
printk(" [%02x] ", i * 4);
printk(" %08x",
be32_to_cpu(((__be32 *) sqp->header_buf)[i]));
if ((i + 1) % 8 == 0)
printk("\n");
}
printk("\n");
}
inl->byte_count = cpu_to_be32(1 << 31 | header_size);
memcpy(inl + 1, sqp->header_buf, header_size);
return ALIGN(sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
}
static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq)
{
unsigned cur;
struct mlx4_ib_cq *cq;
cur = wq->head - wq->tail;
if (likely(cur + nreq < wq->max))
return 0;
cq = to_mcq(ib_cq);
spin_lock(&cq->lock);
cur = wq->head - wq->tail;
spin_unlock(&cq->lock);
return cur + nreq >= wq->max;
}
int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
struct ib_send_wr **bad_wr)
{
struct mlx4_ib_qp *qp = to_mqp(ibqp);
void *wqe;
struct mlx4_wqe_ctrl_seg *ctrl;
unsigned long flags;
int nreq;
int err = 0;
int ind;
int size;
int i;
spin_lock_irqsave(&qp->rq.lock, flags);
ind = qp->sq.head;
for (nreq = 0; wr; ++nreq, wr = wr->next) {
if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
err = -ENOMEM;
*bad_wr = wr;
goto out;
}
if (unlikely(wr->num_sge > qp->sq.max_gs)) {
err = -EINVAL;
*bad_wr = wr;
goto out;
}
ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.max - 1));
qp->sq.wrid[ind & (qp->sq.max - 1)] = wr->wr_id;
ctrl->srcrb_flags =
(wr->send_flags & IB_SEND_SIGNALED ?
cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) |
(wr->send_flags & IB_SEND_SOLICITED ?
cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) |
qp->sq_signal_bits;
if (wr->opcode == IB_WR_SEND_WITH_IMM ||
wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
ctrl->imm = wr->imm_data;
else
ctrl->imm = 0;
wqe += sizeof *ctrl;
size = sizeof *ctrl / 16;
switch (ibqp->qp_type) {
case IB_QPT_RC:
case IB_QPT_UC:
switch (wr->opcode) {
case IB_WR_ATOMIC_CMP_AND_SWP:
case IB_WR_ATOMIC_FETCH_AND_ADD:
((struct mlx4_wqe_raddr_seg *) wqe)->raddr =
cpu_to_be64(wr->wr.atomic.remote_addr);
((struct mlx4_wqe_raddr_seg *) wqe)->rkey =
cpu_to_be32(wr->wr.atomic.rkey);
((struct mlx4_wqe_raddr_seg *) wqe)->reserved = 0;
wqe += sizeof (struct mlx4_wqe_raddr_seg);
if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
((struct mlx4_wqe_atomic_seg *) wqe)->swap_add =
cpu_to_be64(wr->wr.atomic.swap);
((struct mlx4_wqe_atomic_seg *) wqe)->compare =
cpu_to_be64(wr->wr.atomic.compare_add);
} else {
((struct mlx4_wqe_atomic_seg *) wqe)->swap_add =
cpu_to_be64(wr->wr.atomic.compare_add);
((struct mlx4_wqe_atomic_seg *) wqe)->compare = 0;
}
wqe += sizeof (struct mlx4_wqe_atomic_seg);
size += (sizeof (struct mlx4_wqe_raddr_seg) +
sizeof (struct mlx4_wqe_atomic_seg)) / 16;
break;
case IB_WR_RDMA_READ:
case IB_WR_RDMA_WRITE:
case IB_WR_RDMA_WRITE_WITH_IMM:
((struct mlx4_wqe_raddr_seg *) wqe)->raddr =
cpu_to_be64(wr->wr.rdma.remote_addr);
((struct mlx4_wqe_raddr_seg *) wqe)->rkey =
cpu_to_be32(wr->wr.rdma.rkey);
((struct mlx4_wqe_raddr_seg *) wqe)->reserved = 0;
wqe += sizeof (struct mlx4_wqe_raddr_seg);
size += sizeof (struct mlx4_wqe_raddr_seg) / 16;
break;
default:
/* No extra segments required for sends */
break;
}
break;
case IB_QPT_UD:
memcpy(((struct mlx4_wqe_datagram_seg *) wqe)->av,
&to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av));
((struct mlx4_wqe_datagram_seg *) wqe)->dqpn =
cpu_to_be32(wr->wr.ud.remote_qpn);
((struct mlx4_wqe_datagram_seg *) wqe)->qkey =
cpu_to_be32(wr->wr.ud.remote_qkey);
wqe += sizeof (struct mlx4_wqe_datagram_seg);
size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
break;
case IB_QPT_SMI:
case IB_QPT_GSI:
err = build_mlx_header(to_msqp(qp), wr, ctrl);
if (err < 0) {
*bad_wr = wr;
goto out;
}
wqe += err;
size += err / 16;
err = 0;
break;
default:
break;
}
for (i = 0; i < wr->num_sge; ++i) {
((struct mlx4_wqe_data_seg *) wqe)->byte_count =
cpu_to_be32(wr->sg_list[i].length);
((struct mlx4_wqe_data_seg *) wqe)->lkey =
cpu_to_be32(wr->sg_list[i].lkey);
((struct mlx4_wqe_data_seg *) wqe)->addr =
cpu_to_be64(wr->sg_list[i].addr);
wqe += sizeof (struct mlx4_wqe_data_seg);
size += sizeof (struct mlx4_wqe_data_seg) / 16;
}
/* Add one more inline data segment for ICRC for MLX sends */
if (qp->ibqp.qp_type == IB_QPT_SMI || qp->ibqp.qp_type == IB_QPT_GSI) {
((struct mlx4_wqe_inline_seg *) wqe)->byte_count =
cpu_to_be32((1 << 31) | 4);
((u32 *) wqe)[1] = 0;
wqe += sizeof (struct mlx4_wqe_data_seg);
size += sizeof (struct mlx4_wqe_data_seg) / 16;
}
ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ?
MLX4_WQE_CTRL_FENCE : 0) | size;
/*
* Make sure descriptor is fully written before
* setting ownership bit (because HW can start
* executing as soon as we do).
*/
wmb();
if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) {
err = -EINVAL;
goto out;
}
ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] |
(ind & qp->sq.max ? cpu_to_be32(1 << 31) : 0);
++ind;
}
out:
if (likely(nreq)) {
qp->sq.head += nreq;
/*
* Make sure that descriptors are written before
* doorbell record.
*/
wmb();
writel(qp->doorbell_qpn,
to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL);
/*
* Make sure doorbells don't leak out of SQ spinlock
* and reach the HCA out of order.
*/
mmiowb();
}
spin_unlock_irqrestore(&qp->rq.lock, flags);
return err;
}
int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
struct ib_recv_wr **bad_wr)
{
struct mlx4_ib_qp *qp = to_mqp(ibqp);
struct mlx4_wqe_data_seg *scat;
unsigned long flags;
int err = 0;
int nreq;
int ind;
int i;
spin_lock_irqsave(&qp->rq.lock, flags);
ind = qp->rq.head & (qp->rq.max - 1);
for (nreq = 0; wr; ++nreq, wr = wr->next) {
if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.send_cq)) {
err = -ENOMEM;
*bad_wr = wr;
goto out;
}
if (unlikely(wr->num_sge > qp->rq.max_gs)) {
err = -EINVAL;
*bad_wr = wr;
goto out;
}
scat = get_recv_wqe(qp, ind);
for (i = 0; i < wr->num_sge; ++i) {
scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
}
if (i < qp->rq.max_gs) {
scat[i].byte_count = 0;
scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
scat[i].addr = 0;
}
qp->rq.wrid[ind] = wr->wr_id;
ind = (ind + 1) & (qp->rq.max - 1);
}
out:
if (likely(nreq)) {
qp->rq.head += nreq;
/*
* Make sure that descriptors are written before
* doorbell record.
*/
wmb();
*qp->db.db = cpu_to_be32(qp->rq.head & 0xffff);
}
spin_unlock_irqrestore(&qp->rq.lock, flags);
return err;
}
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