From: David S. Miller <davem@davemloft.net>
Date: Thu, 10 Feb 2011 04:42:07 +0000 (-0800)
Subject: ipv4: Cache learned PMTU information in inetpeer.
X-Git-Tag: v2.6.39-rc1~468^2~350
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c8cec5c10bced2408082a6656170e74ac17231c;p=pandora-kernel.git

ipv4: Cache learned PMTU information in inetpeer.

The general idea is that if we learn new PMTU information, we
bump the peer genid.

This triggers the dst_ops->check() code to validate and if
necessary propagate the new PMTU value into the metrics.

Learned PMTU information self-expires.

This means that it is not necessary to kill a cached route
entry just because the PMTU information is too old.

As a consequence:

1) When the path appears unreachable (dst_ops->link_failure
   or dst_ops->negative_advice) we unwind the PMTU state if
   it is out of date, instead of killing the cached route.

   A redirected route will still be invalidated in these
   situations.

2) rt_check_expire(), rt_worker_func(), et al. are no longer
   necessary at all.

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