From: Eric Dumazet <edumazet@google.com>
Date: Thu, 25 Sep 2014 14:17:49 +0000 (-0700)
Subject: mlx4: exploit skb->xmit_more to conditionally send doorbell
X-Git-Tag: fixes-against-v3.18-rc2~144^2~126
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5804283d7cb1da46485950d545dd7869137dcda5;p=pandora-kernel.git

mlx4: exploit skb->xmit_more to conditionally send doorbell

skb->xmit_more tells us if another skb is coming next.

We need to send doorbell when : xmit_more is not set,
or txqueue is stopped (preventing next skb to come immediately)

Tested with a modified pktgen version, I got a 40% increase of
throughput.

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