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[net-next,6/7] net/mlx4_en: Adjust RX frag strides to frag sizes

Message ID 1422979041-25208-7-git-send-email-amirv@mellanox.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Amir Vadai Feb. 3, 2015, 3:57 p.m. UTC 
From: Ido Shamay <idos@mellanox.com>

This patch improves memory utilization and therefore the packets rate
for special MTU's. Instead of setting the frag_stride to the maximal
hard coded frag_size, use the actual frag_size that is set according to
the MTU, when setting the stride of the last frag.
So, for example, for MTU 1600, where the frag_size of the 2nd frag is
86, the frag_size is set to 128 instead of 4096. See below:

Before:
 frag:0 - size:1536 prefix:0 stride:1536
 frag:1 - size:86 prefix:1536 stride:4096

 frag 0 allocator: - size:32768 frags:21
 frag 1 allocator: - size:32768 frags:8

After:
 frag:0 - size:1536 prefix:0 stride:1536
 frag:1 - size:86 prefix:1536 stride:128

 frag 0 allocator: - size:32768 frags:21
 frag 1 allocator: - size:32768 frags:256

Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_rx.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index 30a2203..698d60d 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -1063,8 +1063,9 @@  void mlx4_en_calc_rx_buf(struct net_device *dev)
 			(eff_mtu > buf_size + frag_sizes[i]) ?
 				frag_sizes[i] : eff_mtu - buf_size;
 		priv->frag_info[i].frag_prefix_size = buf_size;
-		priv->frag_info[i].frag_stride = ALIGN(frag_sizes[i],
-						       SMP_CACHE_BYTES);
+		priv->frag_info[i].frag_stride =
+				ALIGN(priv->frag_info[i].frag_size,
+				      SMP_CACHE_BYTES);
 		buf_size += priv->frag_info[i].frag_size;
 		i++;
 	}