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    Subject[PATCH 5.14 376/432] net/mlx5: DR, Enable QP retransmission
    Date
    From: Yevgeny Kliteynik <kliteyn@nvidia.com>

    [ Upstream commit ec449ed8230cd30769de3cb70ee0fce293047372 ]

    Under high stress, SW steering might get stuck on polling for completion
    that never comes.
    For such cases QP needs to have protocol retransmission mechanism enabled.
    Currently the retransmission timeout is defined as 0 (unlimited). Fix this
    by defining a real timeout.

    Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
    Reviewed-by: Alex Vesker <valex@nvidia.com>
    Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c
    index 9df0e73d1c35..69b49deb66b2 100644
    --- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c
    +++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c
    @@ -620,6 +620,7 @@ static int dr_cmd_modify_qp_rtr2rts(struct mlx5_core_dev *mdev,

    MLX5_SET(qpc, qpc, retry_count, attr->retry_cnt);
    MLX5_SET(qpc, qpc, rnr_retry, attr->rnr_retry);
    + MLX5_SET(qpc, qpc, primary_address_path.ack_timeout, 0x8); /* ~1ms */

    MLX5_SET(rtr2rts_qp_in, in, opcode, MLX5_CMD_OP_RTR2RTS_QP);
    MLX5_SET(rtr2rts_qp_in, in, qpn, dr_qp->qpn);
    --
    2.30.2


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