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

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Date:   Sun, 20 Feb 2022 18:52:51 -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 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.

- Alex