path: root/include
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authorHannes Frederic Sowa <hannes@stressinduktion.org>2014-09-28 00:46:06 +0200
committerDavid S. Miller <davem@davemloft.net>2014-09-30 14:00:48 -0400
commit705f1c869d577c8055736dd02501f26a2507dd5b (patch)
tree3a4f24c153155059b2eaa85c30b432fd202902e6 /include
parentdedb845ded56ded1c62f5398a94ffa8615d4592d (diff)
ipv6: remove rt6i_genid
Eric Dumazet noticed that all no-nonexthop or no-gateway routes which are already marked DST_HOST (e.g. input routes routes) will always be invalidated during sk_dst_check. Thus per-socket dst caching absolutely had no effect and early demuxing had no effect. Thus this patch removes rt6i_genid: fn_sernum already gets modified during add operations, so we only must ensure we mutate fn_sernum during ipv6 address remove operations. This is a fairly cost extensive operations, but address removal should not happen that often. Also our mtu update functions do the same and we heard no complains so far. xfrm policy changes also cause a call into fib6_flush_trees. Also plug a hole in rt6_info (no cacheline changes). I verified via tracing that this change has effect. Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: YOSHIFUJI Hideaki <hideaki@yoshifuji.org> Cc: Vlad Yasevich <vyasevich@gmail.com> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com> Cc: Martin Lau <kafai@fb.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
2 files changed, 4 insertions, 21 deletions
diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 9bcb220bd4ad..cf485f9aa563 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -114,16 +114,13 @@ struct rt6_info {
u32 rt6i_flags;
struct rt6key rt6i_src;
struct rt6key rt6i_prefsrc;
- u32 rt6i_metric;
struct inet6_dev *rt6i_idev;
unsigned long _rt6i_peer;
- u32 rt6i_genid;
+ u32 rt6i_metric;
/* more non-fragment space at head required */
unsigned short rt6i_nfheader_len;
u8 rt6i_protocol;
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 361d26077196..e0d64667a4b3 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -352,26 +352,12 @@ static inline void rt_genid_bump_ipv4(struct net *net)
-static inline int rt_genid_ipv6(struct net *net)
- return atomic_read(&net->ipv6.rt_genid);
-static inline void rt_genid_bump_ipv6(struct net *net)
- atomic_inc(&net->ipv6.rt_genid);
-static inline int rt_genid_ipv6(struct net *net)
- return 0;
+extern void (*__fib6_flush_trees)(struct net *net);
static inline void rt_genid_bump_ipv6(struct net *net)
+ if (__fib6_flush_trees)
+ __fib6_flush_trees(net);
static inline struct netns_ieee802154_lowpan *