diff options
| author | Eric Dumazet <edumazet@google.com> | 2014-10-05 13:35:13 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-06 09:04:15 +0400 |
| commit | 3d03641cb4ea050f969dd3ab34113adb95287f36 (patch) | |
| tree | b1cbd2ba62c956e93d88ccde59437d46b21e13da /drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | |
| parent | dc9b06d156cefb95f7f6a3ac0521a3efa31d6805 (diff) | |
| download | linux-3d03641cb4ea050f969dd3ab34113adb95287f36.tar.xz | |
net/mlx4_en: Avoid a cache line miss in TX completion for single frag skb's
Add frag0_dma/frag0_byte_count into mlx4_en_tx_info to avoid a cache
line miss in TX completion for frames having one dma element. (We avoid
reading back the tx descriptor)
Note this could be extended to 2/3 dma elements later, as we have free
room in mlx4_en_tx_info
Also, mlx4_en_free_tx_desc() no longer accesses skb_shinfo(). We use a
new nr_maps fields in mlx4_en_tx_info to avoid 2 or 3 cache misses.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/mlx4_en.h')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h index ab34461e628c..a90403000577 100644 --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h @@ -216,12 +216,15 @@ enum cq_type { struct mlx4_en_tx_info { struct sk_buff *skb; + dma_addr_t map0_dma; + u32 map0_byte_count; u32 nr_txbb; u32 nr_bytes; u8 linear; u8 data_offset; u8 inl; u8 ts_requested; + u8 nr_maps; } ____cacheline_aligned_in_smp; |