From: Eric Dumazet <eric.duma...@gmail.com>
Date: Tue, 15 Sep 2015 15:24:20 -0700
> From: Eric Dumazet <eduma...@google.com>
>
> 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 <eduma...@google.com>
Applied.
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