netdev - Re: [PATCH net-next] tcp: move duplicate code from tcp_v4_init_sock()/tcp_v6_init

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Date:	Thu, 19 Apr 2012 22:21:54 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Neal Cardwell <ncardwell@...gle.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Nandita Dukkipati <nanditad@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>, ilpo.jarvinen@...sinki.fi,
	maze@...gle.com, Tom Herbert <therbert@...gle.com>
Subject: Re: [PATCH net-next] tcp: move duplicate code from
 tcp_v4_init_sock()/tcp_v6_init_sock()

On Thu, 2012-04-19 at 15:55 -0400, Neal Cardwell wrote:
> This commit moves the (substantial) common code shared between
> tcp_v4_init_sock() and tcp_v6_init_sock() to a new address-family
> independent function, tcp_init_sock().
> 
> Centralizing this functionality should help avoid drift issues,
> e.g. where the IPv4 side is updated without a corresponding update to
> IPv6. There was already some drift: IPv4 initialized snd_cwnd to
> TCP_INIT_CWND, while the IPv6 side was still initializing snd_cwnd to
> 2 (in this case it should not matter, since snd_cwnd is also
> initialized in tcp_init_metrics(), but the general risks and
> maintenance overhead remain).
> 
> When diffing the old and new code, note that new tcp_init_sock()
> function uses the order of steps from the tcp_v4_init_sock()
> implementation (the order is slightly different in
> tcp_v6_init_sock()).
> 
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
> ---

Acked-by: Eric Dumazet <edumazet@...gle.com>



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