netdev - Re: [PATCH net-next v3 3/5] tc/act: remove unneeded RCU lock in action callback

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Message-ID: <f140db13-471c-4753-82de-8522c635fa13@mojatatu.com>
Date:   Wed, 25 Jul 2018 07:59:48 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Daniel Borkmann <daniel@...earbox.net>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Eyal Birger <eyal.birger@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next v3 3/5] tc/act: remove unneeded RCU lock in
 action callback

On 24/07/18 04:06 PM, Paolo Abeni wrote:
> Each lockless action currently does its own RCU locking in ->act().
> This is allows using plain RCU accessor, even if the context
> is really RCU BH.
> 
> This change drops the per action RCU lock, replace the accessors
> with _bh variant, cleans up a bit the surronding code and documents
> the RCU status in the relevant header.
> No functional nor performance change is intended.
> 
> The goal of this patch is clarifying that the RCU critical section
> used by the tc actions extends up to the classifier's caller.
> 

This and 2/5 seems to stand on their own merit.

cheers,
jamal