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Subject[PATCH 4.9 02/93] net/mlx5e: Do not reduce LRO WQE size when not using build_skb
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tariq Toukan <tariqt@mellanox.com>


[ Upstream commit 4078e637c12f1e0a74293f1ec9563f42bff14a03 ]

When rq_type is Striding RQ, no room of SKB_RESERVE is needed
as SKB allocation is not done via build_skb.

Fixes: e4b85508072b ("net/mlx5e: Slightly reduce hardware LRO size")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -81,6 +81,7 @@ static bool mlx5e_check_fragmented_strid
static void mlx5e_set_rq_type_params(struct mlx5e_priv *priv, u8 rq_type)
{
priv->params.rq_wq_type = rq_type;
+ priv->params.lro_wqe_sz = MLX5E_PARAMS_DEFAULT_LRO_WQE_SZ;
switch (priv->params.rq_wq_type) {
case MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ:
priv->params.log_rq_size = MLX5E_PARAMS_DEFAULT_LOG_RQ_SIZE_MPW;
@@ -92,6 +93,10 @@ static void mlx5e_set_rq_type_params(str
break;
default: /* MLX5_WQ_TYPE_LINKED_LIST */
priv->params.log_rq_size = MLX5E_PARAMS_DEFAULT_LOG_RQ_SIZE;
+
+ /* Extra room needed for build_skb */
+ priv->params.lro_wqe_sz -= MLX5_RX_HEADROOM +
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
}
priv->params.min_rx_wqes = mlx5_min_rx_wqes(priv->params.rq_wq_type,
BIT(priv->params.log_rq_size));
@@ -3473,12 +3478,6 @@ static void mlx5e_build_nic_netdev_priv(
mlx5e_build_default_indir_rqt(mdev, priv->params.indirection_rqt,
MLX5E_INDIR_RQT_SIZE, profile->max_nch(mdev));

- priv->params.lro_wqe_sz =
- MLX5E_PARAMS_DEFAULT_LRO_WQE_SZ -
- /* Extra room needed for build_skb */
- MLX5_RX_HEADROOM -
- SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
-
/* Initialize pflags */
MLX5E_SET_PRIV_FLAG(priv, MLX5E_PFLAG_RX_CQE_BASED_MODER,
priv->params.rx_cq_period_mode == MLX5_CQ_PERIOD_MODE_START_FROM_CQE);

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