From: Eric Dumazet <edumazet@google.com>
Date: Sun, 5 Oct 2014 09:35:13 +0000 (+0300)
Subject: net/mlx4_en: Avoid a cache line miss in TX completion for single frag skb's
X-Git-Tag: fixes-against-v3.18-rc2~144^2~30^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3d03641cb4ea050f969dd3ab34113adb95287f36;p=pandora-kernel.git

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>
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