netdev - Re: [PATCH net] net: sctp: stop spamming klog with rfc6458, 5.3.2. deprecation warnings

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Message-Id: <20150726.163259.1952188676271532807.davem@davemloft.net>
Date:	Sun, 26 Jul 2015 16:32:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	daniel@...earbox.net
Cc:	jhs@...atatu.com, vyasevic@...hat.com, nhorman@...driver.com,
	David.Laight@...LAB.COM, netdev@...r.kernel.org,
	tuexen@...muenster.de
Subject: Re: [PATCH net] net: sctp: stop spamming klog with rfc6458, 5.3.2.
 deprecation warnings

From: Daniel Borkmann <daniel@...earbox.net>
Date: Wed, 22 Jul 2015 16:31:49 +0200

> Back then when we added support for SCTP_SNDINFO/SCTP_RCVINFO from
> RFC6458 5.3.4/5.3.5, we decided to add a deprecation warning for the
> (as per RFC deprecated) SCTP_SNDRCV via commit bbbea41d5e53 ("net:
> sctp: deprecate rfc6458, 5.3.2. SCTP_SNDRCV support"), see [1].
> 
> Imho, it was not a good idea, and we should just revert that message
> for a couple of reasons:
> 
>   1) It's uapi and therefore set in stone forever.
> 
>   2) To be able to run on older and newer kernels, an SCTP application
>      would need to probe for both, SCTP_SNDRCV, but also SCTP_SNDINFO/
>      SCTP_RCVINFO support, so that on older kernels, it can make use
>      of SCTP_SNDRCV, and on newer kernels SCTP_SNDINFO/SCTP_RCVINFO.
>      In my (limited) experience, a lot of SCTP appliances are migrating
>      to newer kernels only ve(ee)ry slowly.
> 
>   3) Some people don't have the chance to change their applications,
>      f.e. due to proprietary legacy stuff. So, they'll hit this warning
>      in fast path and are stuck with older kernels.
> 
> But i.e. due to point 1) I really fail to see the benefit of a warning.
> So just revert that for now, the issue was reported up Jamal.
> 
>   [1] http://thread.gmane.org/gmane.linux.network/321960/
> 
> Reported-by: Jamal Hadi Salim <jhs@...atatu.com>
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>

Applied, thanks Daniel.
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