From: Yevgeny Kliteynik <kliteyn@nvidia.com>
Date: Thu, 24 Sep 2020 20:58:50 +0300
Subject: net/mlx5: DR, Enable QP retransmission
Patch-mainline: v5.15-rc1
Git-commit: ec449ed8230cd30769de3cb70ee0fce293047372
References: jsc#SLE-19253 stable-5.14.6
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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/mellanox/mlx5/core/steering/dr_send.c | 1 +
1 file changed, 1 insertion(+)
--- 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(stru
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);