ipvs: optimize dst usage for real server

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Currently when forwarding requests to real servers
we use dst_lock and atomic operations when cloning the
dst_cache value. As the dst_cache value does not change
most of the time it is better to use RCU and to lock
dst_lock only when we need to replace the obsoleted dst.
For this to work we keep dst_cache in new structure protected
by RCU. For packets to remote real servers we will use noref
version of dst_cache, it will be valid while we are in RCU
read-side critical section because now dst_release for replaced
dsts will be invoked after the grace period. Packets to
local real servers that are passed to local stack with
NF_ACCEPT need a dst clone.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off by: Hans Schillstrom <hans@schillstrom.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

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Julian Anastasov 2013-03-21 11:58:06 +02:00 • committed by Pablo Neira Ayuso

parent 4115ded131

commit 026ace060d

4 changed files with 177 additions and 59 deletions

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12

include/net/ip_vs.h

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11

net/netfilter/ipvs/ip_vs_core.c

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25

net/netfilter/ipvs/ip_vs_ctl.c

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192

net/netfilter/ipvs/ip_vs_xmit.c

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