[PATCH net-next V2 3/8] net/mlx5e: Slightly reduce hardware LRO size
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STALE3673d
From: Tariq Toukan <hidden>
Date: 2016-09-21 09:20:40
Subsystem:
mellanox ethernet driver (mlx5e), mellanox mlx5 core vpi driver, networking drivers, the rest · Maintainers:
Saeed Mahameed, Tariq Toukan, Mark Bloch, Leon Romanovsky, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Saeed Mahameed <redacted> 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 <redacted> Signed-off-by: Tariq Toukan <redacted> --- drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index f2efa532f453..8734240865e1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c@@ -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,
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1.8.3.1