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| author | Eric Dumazet <edumazet@google.com> | 2015-09-15 15:24:20 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-09-17 21:01:04 -0700 |
| commit | 58d607d3e52f2b15902f58a1161da9fb3b0f6d47 (patch) | |
| tree | 1949d88eb7d541878079ddafa607c31017099349 /include/linux/tcp.h | |
| parent | bbe8373138a1fe92160a18418e7298b4c0128ff1 (diff) | |
| download | lwn-58d607d3e52f2b15902f58a1161da9fb3b0f6d47.tar.gz lwn-58d607d3e52f2b15902f58a1161da9fb3b0f6d47.zip | |
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.h | 1 |
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 */ |