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authorEric Dumazet <edumazet@google.com>2015-09-16 01:24:20 +0300
committerDavid S. Miller <davem@davemloft.net>2015-09-18 07:01:04 +0300
commit58d607d3e52f2b15902f58a1161da9fb3b0f6d47 (patch)
tree1949d88eb7d541878079ddafa607c31017099349 /include/linux/tcp.h
parentbbe8373138a1fe92160a18418e7298b4c0128ff1 (diff)
downloadlinux-58d607d3e52f2b15902f58a1161da9fb3b0f6d47.tar.xz
tcp: provide skb->hash to synack packets
In commit b73c3d0e4f0e ("net: Save TX flow hash in sock and set in skbuf on xmit"), Tom provided a l4 hash to most outgoing TCP packets. We'd like to provide one as well for SYNACK packets, so that all packets of a given flow share same txhash, to later enable bonding driver to also use skb->hash to perform slave selection. Note that a SYNACK retransmit shuffles the tx hash, as Tom did in commit 265f94ff54d62 ("net: Recompute sk_txhash on negative routing advice") for established sockets. This has nice effect making TCP flows resilient to some kind of black holes, even at connection establish phase. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <tom@herbertland.com> Cc: Mahesh Bandewar <maheshb@google.com> Acked-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/tcp.h')
-rw-r--r--include/linux/tcp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 48c3696e8645..937b97893d5f 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -113,6 +113,7 @@ struct tcp_request_sock {
struct inet_request_sock req;
const struct tcp_request_sock_ops *af_specific;
bool tfo_listener;
+ u32 txhash;
u32 rcv_isn;
u32 snt_isn;
u32 snt_synack; /* synack sent time */