netdev - Re: [PATCH net] inet: bring NLM_DONE out to a separate recv() again

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Message-ID: <20240411140154.2acd3d0a@kernel.org>
Date: Thu, 11 Apr 2024 14:01:54 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: David Ahern <dsahern@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
 pabeni@...hat.com, Stefano Brivio <sbrivio@...hat.com>, Ilya Maximets
 <i.maximets@....org>, donald.hunter@...il.com
Subject: Re: [PATCH net] inet: bring NLM_DONE out to a separate recv() again

On Thu, 11 Apr 2024 13:45:42 -0600 David Ahern wrote:
> > +	/* Don't let NLM_DONE coalesce into a message, even if it could.
> > +	 * Some user space expects NLM_DONE in a separate recv().  
> 
> that's unfortunate

Do you have an opinion on the sysfs/opt-in question?
Feels to me like there shouldn't be that much user space doing raw
netlink, without a library. Old crufty code usually does ioctls, right?
So maybe we can periodically reintroduce this bug to shake out all 
the bad apps? :D