netdev - Re: [PATCH v5 05/11] net: mac802154: Create a transmit bus error helper

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Date:   Wed, 6 Apr 2022 17:43:30 -0400
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 v5 05/11] net: mac802154: Create a transmit bus error helper

Hi,

On Wed, Apr 6, 2022 at 11:34 AM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
>
> A few drivers do the full transmit operation asynchronously, which means
> that a bus error that happens when forwarding the packet to the
> transmitter will not be reported immediately. The solution in this case
> is to call this new helper to free the necessary resources, restart the
> the queue and return a generic TRAC error code: IEEE802154_SYSTEM_ERROR.
>
> Suggested-by: Alexander Aring <alex.aring@...il.com>
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  include/net/mac802154.h |  9 +++++++++
>  net/mac802154/util.c    | 10 ++++++++++
>  2 files changed, 19 insertions(+)
>
> diff --git a/include/net/mac802154.h b/include/net/mac802154.h
> index abbe88dc9df5..5240d94aad8e 100644
> --- a/include/net/mac802154.h
> +++ b/include/net/mac802154.h
> @@ -498,6 +498,15 @@ void ieee802154_stop_queue(struct ieee802154_hw *hw);
>  void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
>                               bool ifs_handling);
>
> +/**
> + * ieee802154_xmit_bus_error - frame could not be delivered to the trasmitter
> + *                             because of a bus error
> + *
> + * @hw: pointer as obtained from ieee802154_alloc_hw().
> + * @skb: buffer for transmission
> + */
> +void ieee802154_xmit_bus_error(struct ieee802154_hw *hw, struct sk_buff *skb);
> +
>  /**
>   * ieee802154_xmit_error - frame transmission failed
>   *
> diff --git a/net/mac802154/util.c b/net/mac802154/util.c
> index ec523335336c..79ba803c40c9 100644
> --- a/net/mac802154/util.c
> +++ b/net/mac802154/util.c
> @@ -102,6 +102,16 @@ void ieee802154_xmit_error(struct ieee802154_hw *hw, struct sk_buff *skb,
>  }
>  EXPORT_SYMBOL(ieee802154_xmit_error);
>
> +void ieee802154_xmit_bus_error(struct ieee802154_hw *hw, struct sk_buff *skb)
> +{
> +       struct ieee802154_local *local = hw_to_local(hw);
> +
> +       local->tx_result = IEEE802154_SYSTEM_ERROR;
> +       ieee802154_wake_queue(hw);
> +       dev_kfree_skb_any(skb);
> +}
> +EXPORT_SYMBOL(ieee802154_xmit_bus_error);
> +

why not calling ieee802154_xmit_error(..., IEEE802154_SYSTEM_ERROR) ?
Just don't give the user a chance to pick a error code if something
bad happened.

- Alex