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Date: Fri, 12 Sep 2014 01:21:52 +0200
From: Hannes Frederic Sowa <hannes@...essinduktion.org>
To: netdev@...r.kernel.org
Cc: Eric Dumazet <eric.dumazet@...il.com>,
Vlad Yasevich <vyasevich@...il.com>,
Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH RFC 5/6] ipv6: keep rt_sernum per namespace to reduce number of flushes
This patch moves rt_sernum into per-namespace storage. This reduces number
of flushes needed when a xfrm policy gets modified in one namespace.
Cc: Eric Dumazet <eric.dumazet@...il.com>
Cc: Vlad Yasevich <vyasevich@...il.com>
Cc: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
include/net/netns/ipv6.h | 1 +
net/ipv6/af_inet6.c | 1 +
net/ipv6/ip6_fib.c | 21 +++++++++++----------
3 files changed, 13 insertions(+), 10 deletions(-)
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 3291ba6..2319949 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -76,6 +76,7 @@ struct netns_ipv6 {
#endif
#endif
atomic_t dev_addr_genid;
+ u32 rt_sernum;
};
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 2189d2d..7ff8996 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -766,6 +766,7 @@ static int __net_init inet6_net_init(struct net *net)
net->ipv6.sysctl.icmpv6_time = 1*HZ;
net->ipv6.sysctl.flowlabel_consistency = 1;
net->ipv6.sysctl.auto_flowlabels = 0;
+ net->ipv6.rt_sernum = 1;
err = ipv6_init_mibs(net);
if (err)
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index cffee60..0ffabe2 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -86,8 +86,6 @@ static int fib6_walk_continue(struct fib6_walker_t *w);
* result of redirects, path MTU changes, etc.
*/
-static u32 rt_sernum;
-
static void fib6_gc_timer_cb(unsigned long arg);
static LIST_HEAD(fib6_walkers);
@@ -106,12 +104,15 @@ static inline void fib6_walker_unlink(struct fib6_walker_t *w)
list_del(&w->lh);
write_unlock_bh(&fib6_walker_lock);
}
-static __inline__ u32 fib6_new_sernum(void)
+
+static u32 fib6_new_sernum(struct net *net)
{
- u32 n = ++rt_sernum;
- if ((__s32)n <= 0)
- rt_sernum = n = 1;
- return n;
+ int *n = &net->ipv6.rt_sernum;
+
+ (*n)++;
+ if ((s32)*n <= 0)
+ *n = 1;
+ return *n;
}
/*
@@ -850,7 +851,7 @@ int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info,
int err = -ENOMEM;
int allow_create = 1;
int replace_required = 0;
- u32 sernum = fib6_new_sernum();
+ u32 sernum = fib6_new_sernum(dev_net(rt->dst.dev));
if (info->nlh) {
if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))
@@ -1355,7 +1356,7 @@ int fib6_del(struct rt6_info *rt, struct nl_info *info)
struct net *net = info->nl_net;
struct fib6_node *fn = rt->rt6i_node;
struct rt6_info **rtp;
- u32 sernum = fib6_new_sernum();
+ u32 sernum = fib6_new_sernum(dev_net(rt->dst.dev));
#if RT6_DEBUG >= 2
if (rt->dst.obsolete > 0) {
@@ -1601,7 +1602,7 @@ static void __fib6_clean_all(struct net *net,
hlist_for_each_entry_rcu(table, head, tb6_hlist) {
write_lock_bh(&table->tb6_lock);
sernum = update_sernum && !sernum ?
- fib6_new_sernum() : 0;
+ fib6_new_sernum(net) : 0;
fib6_clean_tree(net, &table->tb6_root,
func, 0, sernum, arg);
write_unlock_bh(&table->tb6_lock);
--
1.9.3
--
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