From 265f94ff54d62503663d9c788ba1f082e448f8b8 Mon Sep 17 00:00:00 2001
From: Tom Herbert <tom@herbertland.com>
Date: Tue, 28 Jul 2015 16:02:06 -0700
Subject: [PATCH] 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>
---
include/net/sock.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/include/net/sock.h b/include/net/sock.h
index fe735c4841f6d..24aa75c5317a0 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -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);
--
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