From a2c554d3f8f65dd9c46a55811efad8156e328f85 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Sun, 7 Jan 2018 12:45:11 +0200 Subject: [PATCH] ipv6: Add explicit flush indication to routes When routes that are a part of a multipath route are evaluated by fib6_ifdown() in response to NETDEV_DOWN and NETDEV_UNREGISTER events the state of their sibling routes is not considered. This will change in subsequent patches in order to align IPv6 with IPv4's behavior. For example, when the last sibling in a multipath route becomes dead, the entire multipath route needs to be removed. To prevent the tree walker from re-evaluating all the sibling routes each time, we can simply evaluate them once - when the first sibling is traversed. If we determine the entire multipath route needs to be removed, then the 'should_flush' bit is set in all the siblings, which will cause the walker to flush them when it traverses them. Signed-off-by: Ido Schimmel Acked-by: David Ahern Signed-off-by: David S. Miller --- include/net/ip6_fib.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h index 44d96a91e745..affea1aa6ae4 100644 --- a/include/net/ip6_fib.h +++ b/include/net/ip6_fib.h @@ -173,7 +173,8 @@ struct rt6_info { unsigned short rt6i_nfheader_len; u8 rt6i_protocol; u8 exception_bucket_flushed:1, - unused:7; + should_flush:1, + unused:6; }; #define for_each_fib6_node_rt_rcu(fn) \