netdev - Re: [PATCH v2 net-next 2/2] tcp: add tcpi_bytes_received to tcp

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Message-Id: <20150429.181244.299663707973224834.davem@davemloft.net>
Date:	Wed, 29 Apr 2015 18:12:44 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	edumazet@...gle.com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com, ycheng@...gle.com,
	mattmathis@...gle.com, salo@...gle.com, kafai@...com,
	rapier@....edu
Subject: Re: [PATCH v2 net-next 2/2] tcp: add tcpi_bytes_received to
 tcp_info

From: Eric Dumazet <edumazet@...gle.com>
Date: Tue, 28 Apr 2015 15:28:18 -0700

> This patch tracks total number of payload bytes received on a TCP socket.
> This is the sum of all changes done to tp->rcv_nxt
> 
> RFC4898 named this : tcpEStatsAppHCThruOctetsReceived
> 
> This is a 64bit field, and can be fetched both from TCP_INFO
> getsockopt() if one has a handle on a TCP socket, or from inet_diag
> netlink facility (iproute2/ss patch will follow)
> 
> Note that tp->bytes_received was placed near tp->rcv_nxt for
> best data locality and minimal performance impact.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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