netdev - Re: [PATCH wpan-next v3 09/11] net: mac802154: Introduce a synchronous API for MLME commands

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Date:   Tue, 17 May 2022 20:41:41 -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 09/11] net: mac802154: Introduce a
 synchronous API for MLME commands

Hi,

On Tue, May 17, 2022 at 12:35 PM 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           | 46 ++++++++++++++++++++++++++++++++++++
>  2 files changed, 47 insertions(+)
>
> diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
> index a057827fc48a..b42c6ac789f5 100644
> --- a/net/mac802154/ieee802154_i.h
> +++ b/net/mac802154/ieee802154_i.h
> @@ -125,6 +125,7 @@ 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);
>  int ieee802154_sync_and_hold_queue(struct ieee802154_local *local);
> +int ieee802154_mlme_tx_one(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 38f74b8b6740..6cc4e5c7ba94 100644
> --- a/net/mac802154/tx.c
> +++ b/net/mac802154/tx.c
> @@ -128,6 +128,52 @@ int ieee802154_sync_and_hold_queue(struct ieee802154_local *local)
>         return ieee802154_sync_queue(local);
>  }
>
> +static int ieee802154_mlme_op_pre(struct ieee802154_local *local)
> +{
> +       return ieee802154_sync_and_hold_queue(local);
> +}
> +
> +static int ieee802154_mlme_tx(struct ieee802154_local *local, struct sk_buff *skb)
> +{
> +       int ret;
> +
> +       /* Avoid possible calls to ->ndo_stop() when we asynchronously perform
> +        * MLME transmissions.
> +        */
> +       rtnl_lock();
> +
> +       /* Ensure the device was not stopped, otherwise error out */
> +       if (!local->open_count)
> +               return -EBUSY;
> +

No -EBUSY here, use ?-ENETDOWN?. You forgot rtnl_unlock() here.

- Alex