From: Julian Anastasov <ja@ssi.bg>
Date: Tue, 4 Sep 2012 11:03:15 +0000 (+0000)
Subject: tcp: add generic netlink support for tcp_metrics
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~47^2~215
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d23ff701643a4a725e2c7a8ba2d567d39daa29ea;p=pandora-kernel.git

tcp: add generic netlink support for tcp_metrics

Add support for genl "tcp_metrics". No locking
is changed, only that now we can unlink and delete
entries after grace period. We implement get/del for
single entry and dump to support show/flush filtering
in user space. Del without address attribute causes
flush for all addresses, sadly under genl_mutex.

v2:
- remove rcu_assign_pointer as suggested by Eric Dumazet,
it is not needed because there are no other writes under lock
- move the flushing code in tcp_metrics_flush_all

v3:
- remove synchronize_rcu on flush as suggested by Eric Dumazet

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
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