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

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Message-ID: <55409393.3040003@iogearbox.net>
Date:	Wed, 29 Apr 2015 10:17:23 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
CC:	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [PATCH net-next 2/2] tcp: add TCP_CC_INFO socket option

On 04/29/2015 01:23 AM, Eric Dumazet 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>

Presuming other cc algorithms would in future also export
internal information through this interface, would it make
sense to put tcp_cc_info into a container structure so we
don't miss out attr (vegas, dctcp, ...), like:

   struct tcp_cc_exp {
     u32               kind;
     union tcp_cc_info info;
   };

Otherwise looks good:

Acked-by: Daniel Borkmann <daniel@...earbox.net>
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