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author | Julian Anastasov <ja@ssi.bg> | 2013-03-22 11:46:53 +0200 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-04-02 00:23:58 +0200 |
commit | ceec4c3816818459d90c92152e61371ff5b1d5a1 (patch) | |
tree | 04cfae26902321af225d53b161c9652e5d2bb306 /net/netfilter/ipvs/ip_vs_proto_tcp.c | |
parent | 413c2d04e9494ca38629d8a7ffeff1e4398a9fe3 (diff) | |
download | op-kernel-dev-ceec4c3816818459d90c92152e61371ff5b1d5a1.zip op-kernel-dev-ceec4c3816818459d90c92152e61371ff5b1d5a1.tar.gz |
ipvs: convert services to rcu
This is the final step in RCU conversion.
Things that are removed:
- svc->usecnt: now svc is accessed under RCU read lock
- svc->inc: and some unused code
- ip_vs_bind_pe and ip_vs_unbind_pe: no ability to replace PE
- __ip_vs_svc_lock: replaced with RCU
- IP_VS_WAIT_WHILE: now readers lookup svcs and dests under
RCU and work in parallel with configuration
Other changes:
- before now, a RCU read-side critical section included the
calling of the schedule method, now it is extended to include
service lookup
- ip_vs_svc_table and ip_vs_svc_fwm_table are now using hlist
- svc->pe and svc->scheduler remain to the end (of grace period),
the schedulers are prepared for such RCU readers
even after done_service is called but they need
to use synchronize_rcu because last ip_vs_scheduler_put
can happen while RCU read-side critical sections
use an outdated svc->scheduler pointer
- as planned, update_service is removed
- empty services can be freed immediately after grace period.
If dests were present, the services are freed from
the dest trash code
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'net/netfilter/ipvs/ip_vs_proto_tcp.c')
-rw-r--r-- | net/netfilter/ipvs/ip_vs_proto_tcp.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c index 0bbc3fe..7de3342 100644 --- a/net/netfilter/ipvs/ip_vs_proto_tcp.c +++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c @@ -47,9 +47,10 @@ tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, } net = skb_net(skb); /* No !th->ack check to allow scheduling on SYN+ACK for Active FTP */ + rcu_read_lock(); if (th->syn && - (svc = ip_vs_service_get(net, af, skb->mark, iph->protocol, - &iph->daddr, th->dest))) { + (svc = ip_vs_service_find(net, af, skb->mark, iph->protocol, + &iph->daddr, th->dest))) { int ignored; if (ip_vs_todrop(net_ipvs(net))) { @@ -57,7 +58,7 @@ tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, * It seems that we are very loaded. * We have to drop this packet :( */ - ip_vs_service_put(svc); + rcu_read_unlock(); *verdict = NF_DROP; return 0; } @@ -70,14 +71,13 @@ tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, if (!*cpp && ignored <= 0) { if (!ignored) *verdict = ip_vs_leave(svc, skb, pd, iph); - else { - ip_vs_service_put(svc); + else *verdict = NF_DROP; - } + rcu_read_unlock(); return 0; } - ip_vs_service_put(svc); } + rcu_read_unlock(); /* NF_ACCEPT */ return 1; } |