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IB/mlx5: Add packet based credit mode support 

The device can support two credit modes, message based (default) and
packet based. In order to enable packet based mode, the QP should be
created with special flag that indicates this.

This patch adds support for the new DV QP creation flag that can be used
for RC QPs in order to change the credit mode.

Signed-off-by: Danit Goldberg <danitg@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Danit Goldberg 2018-11-30 13:22:05 +02:00 коммит произвёл Jason Gunthorpe
Родитель 3fd3c80acc
Коммит 569c665150
3 изменённых файлов: 15 добавлений и 2 удалений
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1
drivers/infiniband/hw/mlx5/mlx5_ib.h
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@ -461,6 +461,7 @@ enum mlx5_ib_qp_flags {
MLX5_IB_QP_UNDERLAY = 1 << 10,
MLX5_IB_QP_PCI_WRITE_END_PADDING = 1 << 11,
MLX5_IB_QP_TUNNEL_OFFLOAD = 1 << 12,
MLX5_IB_QP_PACKET_BASED_CREDIT = 1 << 13,
};
struct mlx5_umr_wr {

15
drivers/infiniband/hw/mlx5/qp.c
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@ -1889,7 +1889,8 @@ static int create_qp_common(struct mlx5_ib_dev *dev, struct ib_pd *pd,
MLX5_QP_FLAG_BFREG_INDEX |
MLX5_QP_FLAG_TYPE_DCT |
MLX5_QP_FLAG_TYPE_DCI |
MLX5_QP_FLAG_ALLOW_SCATTER_CQE))
MLX5_QP_FLAG_ALLOW_SCATTER_CQE |
MLX5_QP_FLAG_PACKET_BASED_CREDIT_MODE))
return -EINVAL;
err = get_qp_user_index(to_mucontext(pd->uobject->context),
@ -1925,6 +1926,15 @@ static int create_qp_common(struct mlx5_ib_dev *dev, struct ib_pd *pd,
qp->flags_en |= MLX5_QP_FLAG_TIR_ALLOW_SELF_LB_MC;
}
if (ucmd.flags & MLX5_QP_FLAG_PACKET_BASED_CREDIT_MODE) {
if (init_attr->qp_type != IB_QPT_RC ||
!MLX5_CAP_GEN(dev->mdev, qp_packet_based)) {
mlx5_ib_dbg(dev, "packet based credit mode isn't supported\n");
return -EOPNOTSUPP;
}
qp->flags |= MLX5_IB_QP_PACKET_BASED_CREDIT;
}
if (init_attr->create_flags & IB_QP_CREATE_SOURCE_QPN) {
if (init_attr->qp_type != IB_QPT_UD ||
(MLX5_CAP_GEN(dev->mdev, port_type) !=
@ -2021,7 +2031,8 @@ static int create_qp_common(struct mlx5_ib_dev *dev, struct ib_pd *pd,
MLX5_SET(qpc, qpc, cd_slave_send, 1);
if (qp->flags & MLX5_IB_QP_MANAGED_RECV)
MLX5_SET(qpc, qpc, cd_slave_receive, 1);
if (qp->flags & MLX5_IB_QP_PACKET_BASED_CREDIT)
MLX5_SET(qpc, qpc, req_e2e_credit_mode, 1);
if (qp->scat_cqe && is_connected(init_attr->qp_type)) {
configure_responder_scat_cqe(init_attr, qpc);
configure_requester_scat_cqe(dev, init_attr,

1
include/uapi/rdma/mlx5-abi.h
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@ -48,6 +48,7 @@ enum {
MLX5_QP_FLAG_TIR_ALLOW_SELF_LB_UC = 1 << 6,
MLX5_QP_FLAG_TIR_ALLOW_SELF_LB_MC = 1 << 7,
MLX5_QP_FLAG_ALLOW_SCATTER_CQE = 1 << 8,
MLX5_QP_FLAG_PACKET_BASED_CREDIT_MODE = 1 << 9,
};
enum {