[PATCH 5.19 035/158] net/mlx5e: Fix wrong application of the LRO state

Greg Kroah-Hartman
2022-08-29T11:19:37Z

From: Aya Levin <ayal@nvidia.com>

[ Upstream commit 7b3707fc79044871ab8f3d5fa5e9603155bb5577 ]

Driver caches packet merge type in mlx5e_params instance which must be
in perfect sync with the netdev_feature's bit.
Prior to this patch, in certain conditions (*) LRO state was set in
mlx5e_params, while netdev_feature's bit was off. Causing the LRO to
be applied on the RQs (HW level).

(*) This can happen only on profile init (mlx5e_build_nic_params()),
when RQ expect non-linear SKB and PCI is fast enough in comparison to
link width.

Solution: remove setting of packet merge type from
mlx5e_build_nic_params() as netdev features are not updated.

Fixes: 619a8f2a42f1 ("net/mlx5e: Use linear SKB in Striding RQ")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 8 --------
1 file changed, 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 087952b84ccb0..62aab20025345 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4733,14 +4733,6 @@ void mlx5e_build_nic_params(struct mlx5e_priv *priv, struct mlx5e_xsk *xsk, u16
/* RQ */
mlx5e_build_rq_params(mdev, params);

- /* HW LRO */
- if (MLX5_CAP_ETH(mdev, lro_cap) &&
- params->rq_wq_type == MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ) {
- /* No XSK params: checking the availability of striding RQ in general. */
- if (!mlx5e_rx_mpwqe_is_linear_skb(mdev, params, NULL))
- params->packet_merge.type = slow_pci_heuristic(mdev) ?
- MLX5E_PACKET_MERGE_NONE : MLX5E_PACKET_MERGE_LRO;
- }
params->packet_merge.timeout = mlx5e_choose_lro_timeout(mdev, MLX5E_DEFAULT_LRO_TIMEOUT);

/* CQ moderation params */
--
2.35.1