netdev - Re: [PATCH net-next 3/5] tcp: Print list of TFO-keys from proc

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Date:   Mon, 17 Dec 2018 15:49:10 -0800
From:   Yuchung Cheng <ycheng@...gle.com>
To:     Christoph Paasch <cpaasch@...le.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next 3/5] tcp: Print list of TFO-keys from proc

On Mon, Dec 17, 2018 at 3:35 PM Christoph Paasch <cpaasch@...le.com> wrote:
>
> On 17/12/18 - 08:52:22, Yuchung Cheng wrote:
> > On Sun, Dec 16, 2018 at 10:32 PM Eric Dumazet <eric.dumazet@...il.com> wrote:
> > >
> > >
> > >
> > > On 12/14/2018 02:40 PM, Christoph Paasch wrote:
> > > > Print the list of the TFO-keys with a comma separated. For setting the
> > > > keys, we still only allow a single one to be set.
> > > >
> > >
> > > I wonder if some applications expecting current format could break
> > > after a formatting change.
> > I have the same concern as well. print the extra keys in a different
> > sysctl maybe? e.g. net.ipv4.tcp_fastopen_alt_keys
>
> True, some apps might break on that.
>
>
> Having a single place where all the keys are shown is still useful as that
> way the key-rotation can simply check the current keys in one place.
That's a good point - I am neutral now to use your existing proposal. Eric?

>
> I'm fine with adding net.ipv4.tcp_fastopen_key_list or something like that,
> if we want to keep sysctl-API stable.
>
>
> Christoph
>