netdev - Re: [PATCH net-next v2 1/5] rtnl: add helper to check if rtnl group has listeners

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Message-ID: <ZW8OiMjYQQClP+D1@nanopsycho>
Date: Tue, 5 Dec 2023 12:50:32 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Pedro Tammela <pctammela@...atatu.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, jhs@...atatu.com,
	xiyou.wangcong@...il.com, marcelo.leitner@...il.com,
	vladbu@...dia.com, Victor Nogueira <victor@...atatu.com>
Subject: Re: [PATCH net-next v2 1/5] rtnl: add helper to check if rtnl group
 has listeners

Mon, Dec 04, 2023 at 09:39:03PM CET, pctammela@...atatu.com wrote:
>From: Jamal Hadi Salim <jhs@...atatu.com>
>
>As of today, rtnl code creates a new skb and unconditionally fills and
>broadcasts it to the relevant group. For most operations this is okay
>and doesn't waste resources in general.
>
>When operations are done without the rtnl_lock, as in tc-flower, such
>skb allocation, message fill and no-op broadcasting can happen in all
>cores of the system, which contributes to system pressure and wastes
>precious cpu cycles when no one will receive the built message.
>
>Introduce this helper so rtnetlink operations can simply check if someone
>is listening and then proceed if necessary.
>
>Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
>Signed-off-by: Victor Nogueira <victor@...atatu.com>
>Signed-off-by: Pedro Tammela <pctammela@...atatu.com>

Reviewed-by: Jiri Pirko <jiri@...dia.com>