netdev - Re: [PATCH net-next 3/3] net/tcp-fastopen: Add new API support

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Date:   Wed, 25 Jan 2017 11:03:02 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Wei Wang <tracywwnj@...il.com>
Cc:     Willy Tarreau <w@....eu>, David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>, Wei Wang <weiwan@...gle.com>
Subject: Re: [PATCH net-next 3/3] net/tcp-fastopen: Add new API support

On Wed, 2017-01-25 at 10:54 -0800, Wei Wang wrote:
> > Yes sorry David, for me it's OK. If Wei runs his whole series of tests
> > on it again, it should be perfect.
> 
> I just ran all the TFO related tests with Willy's patch on top of this
> patch series.
> And everything passes.

Note that I am not sure we correctly test that a second connect() can be
done, and I am not sure kernel would check that the remote IP and
destination port is the same.

Ie what should happen for

setsockopt(fd, SOL_TCP, TCP_FASTOPEN_CONNECT, &on, 4)
connect(fd,  "1.2.3.4:80")
connect(fd, "55.66.77.88:4000")

This multiple connect() thing should have been forbidden in the first
place really.