netdev - Re: [PATCH 1/7] net-tcp: Fast Open base

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Message-Id: <20120716.231644.1189536600250332545.davem@davemloft.net>
Date:	Mon, 16 Jul 2012 23:16:44 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ycheng@...gle.com
Cc:	hkchu@...gle.com, edumazet@...gle.com, ncardwell@...gle.com,
	sivasankar@...ucsd.edu, netdev@...r.kernel.org
Subject: Re: [PATCH 1/7] net-tcp: Fast Open base

From: Yuchung Cheng <ycheng@...gle.com>
Date: Mon, 16 Jul 2012 14:16:44 -0700

> +#define TCPOPT_EXP		254	/* Experimental */
> +/* Magic number to be after the option value for sharing TCP
> + * experimental options. See draft-ietf-tcpm-experimental-options-00.txt
> + */
> +#define TCPOPT_FASTOPEN_MAGIC	0xF989

If I apply this, we're stuck supporting this experimental number
forever.

Because somewhere, someone will have a kernel running using this
number, so we have to support this option value as well as whatever
the official one is.

Therefore I think the only logical thing we can do is only deploy
this once an official option number is choosen.
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