netdev - Re: [PATCH net-next 2/2] tcp: add TCP_CC

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Message-ID: <CADVnQymQwo-teVfqos5M0yFVF_AZarv+BUQJRscz9kHs9x6scg@mail.gmail.com>
Date:	Tue, 28 Apr 2015 21:00:06 -0400
From:	Neal Cardwell <ncardwell@...gle.com>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH net-next 2/2] tcp: add TCP_CC_INFO socket option

On Tue, Apr 28, 2015 at 7:23 PM, Eric Dumazet <edumazet@...gle.com> wrote:
> Some Congestion Control modules can provide per flow information,
> but current way to get this information is to use netlink.
>
> Like TCP_INFO, let's add TCP_CC_INFO so that applications can
> issue a getsockopt() if they have a socket file descriptor,
> instead of playing complex netlink games.
>
> Sample usage would be :
>
>   union tcp_cc_info info;
>   socklen_t len = sizeof(info);
>
>   if (getsockopt(fd, SOL_TCP, TCP_CC_INFO, &info, &len) == -1)
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Yuchung Cheng <ycheng@...gle.com>
> Cc: Neal Cardwell <ncardwell@...gle.com>
> ---

Acked-by: Neal Cardwell <ncardwell@...gle.com>

A very useful facility. Thanks for putting this together, Eric!

neal
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