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net/mlx5e: SHAMPO, Fix invalid WQ linked list unlink

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When all the strides in a WQE have been consumed, the WQE is unlinked
from the WQ linked list (mlx5_wq_ll_pop()). For SHAMPO, it is possible
to receive CQEs with 0 consumed strides for the same WQE even after the
WQE is fully consumed and unlinked. This triggers an additional unlink
for the same wqe which corrupts the linked list.

Fix this scenario by accepting 0 sized consumed strides without
unlinking the WQE again.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20240603212219.1037656-4-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dragos Tatulea
2024-06-04 00:22:08 +03:00
committed by Jakub Kicinski
parent 70bd03b89f
commit fba8334721
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
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@@ -2375,6 +2375,9 @@ static void mlx5e_handle_rx_cqe_mpwrq_shampo(struct mlx5e_rq *rq, struct mlx5_cq
if (likely(wi->consumed_strides < rq->mpwqe.num_strides))
return;
if (unlikely(!cstrides))
return;
wq = &rq->mpwqe.wq;
wqe = mlx5_wq_ll_get_wqe(wq, wqe_id);
mlx5_wq_ll_pop(wq, cqe->wqe_id, &wqe->next.next_wqe_index);