Commit 265f94ff authored Jul 28, 2015 by Tom Herbert Committed by David S. Miller Jul 29, 2015

net: Recompute sk_txhash on negative routing advice



When a connection is failing a transport protocol calls
dst_negative_advice to try to get a better route. This patch includes
changing the sk_txhash in that function. This provides a rudimentary
method to try to find a different path in the network since sk_txhash
affects ECMP on the local host and through the network (via flow labels
or UDP source port in encapsulation).

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 877d1f62

include/net/sock.h

+8 −0

Original line number	Diff line number	Diff line
		@@ -1695,6 +1695,12 @@ static inline void sk_set_txhash(struct sock *sk)
		sk->sk_txhash = 1;
		}

		static inline void sk_rethink_txhash(struct sock *sk)
		{
		if (sk->sk_txhash)
		sk_set_txhash(sk);
		}

		static inline struct dst_entry *
		__sk_dst_get(struct sock *sk)
		{
		@@ -1719,6 +1725,8 @@ static inline void dst_negative_advice(struct sock *sk)
		{
		struct dst_entry ndst, dst = __sk_dst_get(sk);

		sk_rethink_txhash(sk);

		if (dst && dst->ops->negative_advice) {
		ndst = dst->ops->negative_advice(dst);