netdev - Re: [PATCH wpan-next v2 14/14] net: mac802154: Introduce a synchronous API for MLME commands

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Message-ID: <CAB_54W6M+AhrB5mT0Lhm2XoKvxgXTowExiF33uzJdXd_KoQhRQ@mail.gmail.com>
Date:   Mon, 21 Feb 2022 15:33:41 -0500
From:   Alexander Aring <alex.aring@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...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>
Subject: Re: [PATCH wpan-next v2 14/14] net: mac802154: Introduce a
 synchronous API for MLME commands

Hi,

On Mon, Feb 21, 2022 at 3:33 PM Alexander Aring <alex.aring@...il.com> wrote:
>
> Hi,
>
> On Sun, Feb 20, 2022 at 6:52 PM Alexander Aring <alex.aring@...il.com> wrote:
> >
> > Hi,
> >
> > On Mon, Feb 7, 2022 at 9:48 AM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
> > >
> > > This is the slow path, we need to wait for each command to be processed
> > > before continuing so let's introduce an helper which does the
> > > transmission and blocks until it gets notified of its asynchronous
> > > completion. This helper is going to be used when introducing scan
> > > support.
> > >
> > > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > > ---
> > >  net/mac802154/ieee802154_i.h | 1 +
> > >  net/mac802154/tx.c           | 6 ++++++
> > >  2 files changed, 7 insertions(+)
> > >
> > > diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
> > > index 295c9ce091e1..ad76a60af087 100644
> > > --- a/net/mac802154/ieee802154_i.h
> > > +++ b/net/mac802154/ieee802154_i.h
> > > @@ -123,6 +123,7 @@ extern struct ieee802154_mlme_ops mac802154_mlme_wpan;
> > >  void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb);
> > >  void ieee802154_xmit_sync_worker(struct work_struct *work);
> > >  void ieee802154_sync_and_stop_tx(struct ieee802154_local *local);
> > > +void ieee802154_mlme_tx(struct ieee802154_local *local, struct sk_buff *skb);
> > >  netdev_tx_t
> > >  ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev);
> > >  netdev_tx_t
> > > diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
> > > index 06ae2e6cea43..7c281458942e 100644
> > > --- a/net/mac802154/tx.c
> > > +++ b/net/mac802154/tx.c
> > > @@ -126,6 +126,12 @@ void ieee802154_sync_and_stop_tx(struct ieee802154_local *local)
> > >         atomic_dec(&local->phy->hold_txs);
> > >  }
> > >
> > > +void ieee802154_mlme_tx(struct ieee802154_local *local, struct sk_buff *skb)
> > > +{
> > > +       ieee802154_tx(local, skb);
> > > +       ieee802154_sync_and_stop_tx(local);
> >
> > Some of those functions can fail, in async case we can do some stats
> > but here we can deliver the caller an error. Please do so.
> >
>
> to more specify what I mean here is also to get an error if the async
> transmit path ends with the error case and not success. You need to

s/not success/success/

- Alex