netdev - Re: [PATCH wpan-next v3 10/11] net: mac802154: Add a warning in the hot path

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Date:   Wed, 18 May 2022 21:52:48 -0400
From:   Alexander Aring <aahringo@...hat.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        David Girault <david.girault@...vo.com>,
        Romuald Despres <romuald.despres@...vo.com>,
        Frederic Blain <frederic.blain@...vo.com>,
        Nicolas Schodet <nico@...fr.eu.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH wpan-next v3 10/11] net: mac802154: Add a warning in the
 hot path

Hi,

On Wed, May 18, 2022 at 12:29 PM Miquel Raynal
<miquel.raynal@...tlin.com> wrote:
>
>
> aahringo@...hat.com wrote on Wed, 18 May 2022 10:31:55 -0400:
>
> > Hi,
> >
> > On Wed, May 18, 2022 at 4:55 AM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
> > >
> > >
> > > aahringo@...hat.com wrote on Tue, 17 May 2022 20:58:19 -0400:
> > >
> > > > Hi,
> > > >
> > > > On Tue, May 17, 2022 at 12:35 PM Miquel Raynal
> > > > <miquel.raynal@...tlin.com> wrote:
> > > > >
> > > > > We should never start a transmission after the queue has been stopped.
> > > > >
> > > > > But because it might work we don't kill the function here but rather
> > > > > warn loudly the user that something is wrong.
> > > > >
> > > > > Set an atomic when the queue will remain stopped. Reset this atomic when
> > > > > the queue actually gets restarded. Just check this atomic to know if the
> > > > > transmission is legitimate, warn if it is not.
> > > > >
> > > > > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > > > > ---
> > > > >  include/net/cfg802154.h |  1 +
> > > > >  net/mac802154/tx.c      | 16 +++++++++++++++-
> > > > >  net/mac802154/util.c    |  1 +
> > > > >  3 files changed, 17 insertions(+), 1 deletion(-)
> > > > >
> > > > > diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
> > > > > index 8881b6126b58..f4e7b3fe7cf0 100644
> > > > > --- a/include/net/cfg802154.h
> > > > > +++ b/include/net/cfg802154.h
> > > > > @@ -218,6 +218,7 @@ struct wpan_phy {
> > > > >         spinlock_t queue_lock;
> > > > >         atomic_t ongoing_txs;
> > > > >         atomic_t hold_txs;
> > > > > +       unsigned long queue_stopped;
> > > >
> > > > Can we name it something like state_flags (as phy state flags)? Pretty
> > > > sure there will be more coming, or internal_flags, no idea...
> > > > something_flags...
> > >
> > > 'phy_flags'? Just 'flags', maybe?
> >
> > make it so.
>
> Oh, there is already a flags entry in wpan_phy. I've adjusted the
> naming to what existed (keeping the _STATE_ prefix) and kept that
> "flags" entry instead of creating a new one.
>
make it so.

- Alex