From: Alexander Aring <alex.aring@gmail.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Stefan Schmidt <stefan@datenfreihafen.org>,
linux-wpan - ML <linux-wpan@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
"open list:NETWORKING [GENERAL]" <netdev@vger.kernel.org>,
David Girault <david.girault@qorvo.com>,
Romuald Despres <romuald.despres@qorvo.com>,
Frederic Blain <frederic.blain@qorvo.com>,
Nicolas Schodet <nico@ni.fr.eu.org>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: Re: [PATCH wpan-next v2 14/14] net: mac802154: Introduce a synchronous API for MLME commands
Date: Mon, 21 Feb 2022 15:33:00 -0500 [thread overview]
Message-ID: <CAB_54W5YHhcOtZ6D7cgSvDb0cakoL5tJjrN7fX9jiK6x=gOTVQ@mail.gmail.com> (raw)
In-Reply-To: <CAB_54W45p6e5sY6O=yHq39vsN+h_Yi6e9=GGky+1vO_H3oUj9A@mail.gmail.com>
Hi,
On Sun, Feb 20, 2022 at 6:52 PM Alexander Aring <alex.aring@gmail.com> wrote:
>
> Hi,
>
> On Mon, Feb 7, 2022 at 9:48 AM Miquel Raynal <miquel.raynal@bootlin.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@bootlin.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
put a tx result int a global pointer to return it here and fetch it
before wake_up() "ieee802154_sync_and_stop_tx()".
Also I think we ignore here the case that the interface goes down
waiting for tx completion which means we are calling stop() callback
on the driver layer. I am worried that if stop() happens during
ieee802154_mlme_tx() we are running in a deadlock because a "tx
complete" will never occur?
- Alex
next prev parent reply other threads:[~2022-02-21 20:33 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-07 14:47 [PATCH wpan-next v2 00/14] ieee802154: Synchronous Tx API Miquel Raynal
2022-02-07 14:47 ` [PATCH wpan-next v2 01/14] net: ieee802154: Move the logic restarting the queue upon transmission Miquel Raynal
2022-02-07 14:47 ` [PATCH wpan-next v2 02/14] net: mac802154: Create a transmit error helper Miquel Raynal
2022-02-20 23:31 ` Alexander Aring
2022-02-21 20:22 ` Alexander Aring
2022-02-22 8:43 ` Miquel Raynal
2022-02-24 1:53 ` Alexander Aring
2022-02-07 14:47 ` [PATCH wpan-next v2 03/14] net: ieee802154: at86rf230: Call _xmit_error() when a transmission fails Miquel Raynal
2022-02-07 14:47 ` [PATCH wpan-next v2 04/14] net: ieee802154: atusb: " Miquel Raynal
2022-02-20 23:35 ` Alexander Aring
2022-02-24 2:00 ` Alexander Aring
2022-02-24 14:43 ` Miquel Raynal
2022-02-07 14:47 ` [PATCH wpan-next v2 05/14] net: ieee802154: ca8210: " Miquel Raynal
2022-02-07 14:47 ` [PATCH wpan-next v2 06/14] net: mac802154: Stop exporting ieee802154_wake/stop_queue() Miquel Raynal
2022-02-07 14:47 ` [PATCH wpan-next v2 07/14] net: mac802154: Rename the synchronous xmit worker Miquel Raynal
2022-02-07 14:47 ` [PATCH wpan-next v2 08/14] net: mac802154: Rename the main tx_work struct Miquel Raynal
2022-02-07 14:47 ` [PATCH wpan-next v2 09/14] net: mac802154: Follow the count of ongoing transmissions Miquel Raynal
2022-02-07 14:48 ` [PATCH wpan-next v2 10/14] net: mac802154: Hold the transmit queue when relevant Miquel Raynal
2022-02-07 14:48 ` [PATCH wpan-next v2 11/14] net: mac802154: Create a hot tx path Miquel Raynal
2022-02-07 14:48 ` [PATCH wpan-next v2 12/14] net: mac802154: Add a warning in the hot path Miquel Raynal
2022-02-07 14:48 ` [PATCH wpan-next v2 13/14] net: mac802154: Introduce a tx queue flushing mechanism Miquel Raynal
2022-02-20 23:49 ` Alexander Aring
2022-03-03 18:17 ` Miquel Raynal
2022-03-04 10:54 ` Miquel Raynal
2022-03-13 20:43 ` Alexander Aring
2022-03-18 18:11 ` Miquel Raynal
2022-03-27 16:45 ` Alexander Aring
2022-03-29 16:29 ` Miquel Raynal
2022-02-07 14:48 ` [PATCH wpan-next v2 14/14] net: mac802154: Introduce a synchronous API for MLME commands Miquel Raynal
2022-02-20 23:52 ` Alexander Aring
2022-02-21 20:33 ` Alexander Aring [this message]
2022-02-21 20:33 ` Alexander Aring
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