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

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Date: Thu, 11 Apr 2024 15:14:32 -0600
From: David Ahern <dsahern@...nel.org>
To: Jakub Kicinski <kuba@...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 4/11/24 3:01 PM, Jakub Kicinski wrote:
> 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?

Not a performance critical path, so I would not add it right now.

> 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

:-) On the one hand, yea, push apps to improve. On the other, Donald
(FRR) is one who complains about nightmares chasing nuances across kernels.