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

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Date:	Thu, 19 Jul 2012 10:59:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	ycheng@...gle.com, 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

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 19 Jul 2012 19:57:51 +0200

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

I guess you're trying to ACK this? :-)
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