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net/mlx5e: Slightly reduce hardware LRO size

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Before this patch LRO size was 64K, now with build_skb requires
extra room, headroom + sizeof(skb_shared_info) added to the data
buffer will make  wqe size or page_frag_size slightly larger than
64K which will demand order 5 page instead of order 4 in 4K page systems.

We take those extra bytes from hardware LRO data size in order to not
increase the required page order for when hardware LRO is enabled.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Saeed Mahameed 2016-09-21 12:19:44 +03:00 committed by David S. Miller
parent 21c59685dd
commit e4b8550807
1 changed files with 5 additions and 2 deletions
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7
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
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@ -3187,8 +3187,11 @@ static void mlx5e_build_nic_netdev_priv(struct mlx5_core_dev *mdev,
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;
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,