From: David S. Miller <davem@davemloft.net>
Date: Mon, 13 Dec 2010 20:52:14 +0000 (-0800)
Subject: net: Abstract default ADVMSS behind an accessor.
X-Git-Tag: v2.6.38-rc1~476^2~170
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0dbaee3b37e118a96bb7b8eb0d9bbaeeb46264be;p=pandora-kernel.git

net: Abstract default ADVMSS behind an accessor.

Make all RTAX_ADVMSS metric accesses go through a new helper function,
dst_metric_advmss().

Leave the actual default metric as "zero" in the real metric slot,
and compute the actual default value dynamically via a new dst_ops
AF specific callback.

For stacked IPSEC routes, we use the advmss of the path which
preserves existing behavior.

Unlike ipv4/ipv6, DecNET ties the advmss to the mtu and thus updates
advmss on pmtu updates.  This inconsistency in advmss handling
results in more raw metric accesses than I wish we ended up with.

Signed-off-by: David S. Miller <davem@davemloft.net>
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