netdev - Re: [PATCH v3 27/41] net: mac802154: Introduce a tx queue flushing mechanism

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Message-ID: <20220118191429.19ea3c7d@xps13>
Date:   Tue, 18 Jan 2022 19:14:29 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Alexander Aring <alex.aring@...il.com>
Cc:     Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        "linux-wireless@...r.kernel.org Wireless" 
        <linux-wireless@...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>,
        Michael Hennerich <michael.hennerich@...log.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Varka Bhadram <varkabhadram@...il.com>,
        Xue Liu <liuxuenetmail@...il.com>, Alan Ott <alan@...nal11.us>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 27/41] net: mac802154: Introduce a tx queue flushing
 mechanism

Hi Alexander,

alex.aring@...il.com wrote on Mon, 17 Jan 2022 17:43:49 -0500:

> Hi,
> 
> On Mon, 17 Jan 2022 at 06:55, Miquel Raynal <miquel.raynal@...tlin.com> wrote:
> ...
> >
> >         /* stop hardware - this must stop RX */
> > diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
> > index 0291e49058f2..37d5438fdb3f 100644
> > --- a/net/mac802154/ieee802154_i.h
> > +++ b/net/mac802154/ieee802154_i.h
> > @@ -122,6 +122,7 @@ 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_tx(struct ieee802154_local *local);
> >  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 de5ecda80472..d1fd2cc67cbe 100644
> > --- a/net/mac802154/tx.c
> > +++ b/net/mac802154/tx.c
> > @@ -48,6 +48,7 @@ void ieee802154_xmit_sync_worker(struct work_struct *work)
> >
> >         kfree_skb(skb);
> >         atomic_dec(&local->phy->ongoing_txs);
> > +       wake_up(&local->phy->sync_txq);  
> 
> if (atomic_dec_and_test(&hw->phy->ongoing_txs))
>       wake_up(&hw->phy->sync_txq);

As we test this condition in the waiting path I assumed it was fine to
do it this way, but the additional check does not hurt, so I'll add it.

Thanks,
Miquèl