From: Eric Dumazet <edumazet@google.com>
Date: Sun, 5 Oct 2014 17:11:27 +0000 (-0700)
Subject: net: introduce netdevice gso_min_segs attribute
X-Git-Tag: fixes-against-v3.18-rc2~144^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcbeb976d7ce783fd58e63e61c196d9a8912b3be;p=pandora-kernel.git

net: introduce netdevice gso_min_segs attribute

Some TSO engines might have a too heavy setup cost, that impacts
performance on hosts sending small bursts (2 MSS per packet).

This patch adds a device gso_min_segs, allowing drivers to set
a minimum segment size for TSO packets, according to the NIC
performance.

Tested on a mlx4 NIC, this allows to get a ~110% increase of
throughput when sending 2 MSS per packet.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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