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

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Date: Mon, 3 Jun 2024 09:33:55 -0600
From: David Ahern <dsahern@...nel.org>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: Jakub Kicinski <kuba@...nel.org>,
 Stephen Hemminger <stephen@...workplumber.org>, davem@...emloft.net,
 netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
 Jaroslav Pulchart <jaroslav.pulchart@...ddata.com>
Subject: Re: [PATCH net] inet: bring NLM_DONE out to a separate recv() in
 inet_dump_ifaddr()

On 6/3/24 8:05 AM, Jamal Hadi Salim wrote:
> 
> Sorry, being a little lazy so asking instead:
> NLMSG_DONE is traditionally the "EOT" (end of transaction) signal, if
> you get rid of it  - how does the user know there are more msgs coming
> or the dump transaction is over? In addition to the user->kernel "I am
> modern", perhaps set the nlmsg_flag in the reverse path to either say
> "there's more coming" which you dont set on the last message or "we
> are doing this the new way". Backward compat is very important - there
> are dinosaur apps out there that will break otherwise.
> 

NLM_DONE is not getting removed. The recent changes allow the end
message signal without a separate system call.