From: Neil Horman <nhorman@tuxdriver.com>
Date: Thu, 17 Jul 2008 03:50:49 +0000 (-0700)
Subject: core: add stat to track unresolved discards in neighbor cache
X-Git-Tag: v2.6.27-rc1~969^2~84
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9a6d276e85aa3d8f308fc5e8de6892daeb60ae5f;p=pandora-kernel.git

core: add stat to track unresolved discards in neighbor cache

in __neigh_event_send, if we have a neighbour entry which is in
NUD_INCOMPLETE state, we enqueue any outbound frames to that neighbour
to the neighbours arp_queue, which is default capped to a length of 3
skbs.  If that queue exceeds its set length, it will drop an skb on
the queue to enqueue the newly arrived skb.  This results in a drop
for which we have no statistics incremented.  This patch adds an
unresolved_discards stat to /proc/net/stat/ndisc_cache to track these
lost frames.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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