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IB/mlx4: Add Scatter FCS support over WQ creation

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As a default, for Ethernet packets, the device scatters only the payload
of ingress packets. The scatter FCS feature lets the user to get the FCS
(Ethernet's frame check sequence) in the received WR's buffer as a 4
Bytes trailer following the packet's payload.

Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Guy Levi <guyle@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Guy Levi
2018-03-15 16:56:40 +02:00
committed by Jason Gunthorpe
parent 9c71172c4a
commit 6d06c9aa38
3 changed files with 32 additions and 9 deletions
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19
drivers/infiniband/hw/mlx4/qp.c
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@@ -1096,6 +1096,17 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
qp->inl_recv_sz = ucmd.qp.inl_recv_sz;
}
if (init_attr->create_flags & IB_QP_CREATE_SCATTER_FCS) {
if (!(dev->dev->caps.flags &
MLX4_DEV_CAP_FLAG_FCS_KEEP)) {
pr_debug("scatter FCS is unsupported\n");
err = -EOPNOTSUPP;
goto err;
}
qp->flags |= MLX4_IB_QP_SCATTER_FCS;
}
err = set_rq_size(dev, &init_attr->cap, !!pd->uobject,
qp_has_rq(init_attr), qp, qp->inl_recv_sz);
if (err)
@@ -2234,6 +2245,9 @@ static int __mlx4_ib_modify_qp(void *src, enum mlx4_ib_source_type src_type,
if (qp->inl_recv_sz)
context->param3 |= cpu_to_be32(1 << 25);
if (qp->flags & MLX4_IB_QP_SCATTER_FCS)
context->param3 |= cpu_to_be32(1 << 29);
if (qp_type == IB_QPT_GSI || qp_type == IB_QPT_SMI)
context->mtu_msgmax = (IB_MTU_4096 << 5) | 11;
else if (qp_type == IB_QPT_RAW_PACKET)
@@ -4204,7 +4218,7 @@ struct ib_wq *mlx4_ib_create_wq(struct ib_pd *pd,
return ERR_PTR(-EOPNOTSUPP);
}
if (init_attr->create_flags) {
if (init_attr->create_flags & ~IB_WQ_FLAGS_SCATTER_FCS) {
pr_debug("unsupported create_flags %u\n",
init_attr->create_flags);
return ERR_PTR(-EOPNOTSUPP);
@@ -4225,6 +4239,9 @@ struct ib_wq *mlx4_ib_create_wq(struct ib_pd *pd,
ib_qp_init_attr.recv_cq = init_attr->cq;
ib_qp_init_attr.send_cq = ib_qp_init_attr.recv_cq; /* Dummy CQ */
if (init_attr->create_flags & IB_WQ_FLAGS_SCATTER_FCS)
ib_qp_init_attr.create_flags |= IB_QP_CREATE_SCATTER_FCS;
err = create_qp_common(dev, pd, MLX4_IB_RWQ_SRC, &ib_qp_init_attr,
udata, 0, &qp);
if (err) {