From: Dragos Tatulea dtatulea@nvidia.com
[ Upstream commit fba8334721e266f92079632598e46e5f89082f30 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c index 56d1bd22c7c66..97d1cfec4ec03 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c @@ -2146,6 +2146,9 @@ 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); mlx5e_free_rx_mpwqe(rq, wi, true);