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net/mlx4_en: Adjust RX frag strides to frag sizes 

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Shamay 2015-02-03 17:57:20 +02:00 committed by David S. Miller
parent b110d2ce49
commit e8e7f018f1
1 changed files with 3 additions and 2 deletions
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5
drivers/net/ethernet/mellanox/mlx4/en_rx.c
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@ -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++;
}