netdev - Re: [RFC net-next 1/3] net: provide macros for commonly copied lockless queue stop/wake code

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Message-ID: <640e7e633acec_24c5ed2088c@willemb.c.googlers.com.notmuch>
Date:   Sun, 12 Mar 2023 21:37:39 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, alexanderduyck@...com, roman.gushchin@...ux.dev
Subject: Re: [RFC net-next 1/3] net: provide macros for commonly copied
 lockless queue stop/wake code

Stephen Hemminger wrote:
> On Fri, 10 Mar 2023 21:01:28 -0800
> Jakub Kicinski <kuba@...nel.org> wrote:
> 
> > A lot of drivers follow the same scheme to stop / start queues
> > without introducing locks between xmit and NAPI tx completions.
> > I'm guessing they all copy'n'paste each other's code.
> > 
> > Smaller drivers shy away from the scheme and introduce a lock
> > which may cause deadlocks in netpoll.
> > 
> > Provide macros which encapsulate the necessary logic.
> 
> Could any of these be inline functions instead for type safety?

I suppose not because of the condition that is evaluated.

Btw: perdicate -> predicate