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net: Recompute sk_txhash on negative routing advice

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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>
This commit is contained in:
Tom Herbert 2015-07-28 16:02:06 -07:00 committed by David S. Miller
parent 877d1f6291
commit 265f94ff54
1 changed files with 8 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

8
include/net/sock.h
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@ -1695,6 +1695,12 @@ static inline void sk_set_txhash(struct sock *sk)
sk->sk_txhash = 1; 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 * static inline struct dst_entry *
__sk_dst_get(struct sock *sk) __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); struct dst_entry *ndst, *dst = __sk_dst_get(sk);
sk_rethink_txhash(sk);
if (dst && dst->ops->negative_advice) { if (dst && dst->ops->negative_advice) {
ndst = dst->ops->negative_advice(dst); ndst = dst->ops->negative_advice(dst);