From: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Date: Mon, 10 Jun 2013 08:40:10 +0000 (+0300)
Subject: tcp: add low latency socket poll support.
X-Git-Tag: v3.11-rc1~16^2~130^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d30e383bb856f614ddb5bbbb5a7d3f86240e41ec;p=pandora-kernel.git

tcp: add low latency socket poll support.

Adds low latency socket poll support for TCP.
In tcp_v[46]_rcv() add a call to sk_mark_ll() to copy the napi_id
from the skb to the sk.
In tcp_recvmsg(), when there is no data in the socket we busy-poll.
This is a good example of how to add busy-poll support to more protocols.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Tested-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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