netdev - Re: [PATCH v3 3/7] net-tcp: Fast Open client

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Date:	Thu, 19 Jul 2012 19:57:51 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yuchung Cheng <ycheng@...gle.com>
Cc:	davem@...emloft.net, hkchu@...gle.com, edumazet@...gle.com,
	ncardwell@...gle.com, sivasankar@...ucsd.edu,
	netdev@...r.kernel.org
Subject: Re: [PATCH v3 3/7] net-tcp: Fast Open client - sending SYN-data

On Thu, 2012-07-19 at 09:43 -0700, Yuchung Cheng wrote:
> This patch implements sending SYN-data in tcp_connect(). The data is
> from tcp_sendmsg() with flag MSG_FASTOPEN (implemented in a later patch).
> 
> The length of the cookie in tcp_fastopen_req, init'd to 0, controls the
> type of the SYN. If the cookie is not cached (len==0), the host sends
> data-less SYN with Fast Open cookie request option to solicit a cookie
> from the remote. If cookie is not available (len > 0), the host sends
> a SYN-data with Fast Open cookie option. If cookie length is negative,
>   the SYN will not include any Fast Open option (for fall back operations).
> 
> To deal with middleboxes that may drop SYN with data or experimental TCP
> option, the SYN-data is only sent once. SYN retransmits do not include
> data or Fast Open options. The connection will fall back to regular TCP
> handshake.
> 
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
> ---
>  include/linux/snmp.h  |    1 +
>  include/linux/tcp.h   |    6 ++-
>  include/net/tcp.h     |    9 ++++
>  net/ipv4/af_inet.c    |   10 +++-
>  net/ipv4/proc.c       |    1 +
>  net/ipv4/tcp_output.c |  115 +++++++++++++++++++++++++++++++++++++++++++++----
>  6 files changed, 130 insertions(+), 12 deletions(-)

Eric Dumazet <edumazet@...gle.com>


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