netdev - Re: On TCP_CONGESTION & letter case

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Date: Sun, 19 Nov 2023 11:37:02 -0800
From: Cong Wang <xiyou.wangcong@...il.com>
To: rjmcmahon <rjmcmahon@...cmahon.com>
Cc: Netdev <netdev@...r.kernel.org>
Subject: Re: On TCP_CONGESTION & letter case

On Sun, Nov 19, 2023 at 10:36:03AM -0800, rjmcmahon wrote:
> Hi all,
> 
> Will the CCA string in setsockopt and getsockopt for TCP_CONGESTION always
> be lowercase?
> 

I am not aware of any such guarantee. From kernel's point of view, it is just
a simple string search in /proc/sys/net/ipv4/tcp_available_congestion_control,
so in the future we may add CCA with upper cases. And, since CCA can be
a kernel module, _maybe_ there are already OOT modules using upper case
names.

Thanks.