netdev - Re: [PATCH wpan-next v2 02/14] net: mac802154: Create a transmit error helper

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Date:   Sun, 20 Feb 2022 18:31:44 -0500
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@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Network Development <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 02/14] net: mac802154: Create a transmit
 error helper

Hi,

On Mon, Feb 7, 2022 at 10:09 AM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
>
> So far there is only a helper for successful transmission, which led
> device drivers to implement their own handling in case of
> error. Unfortunately, we really need all the drivers to give the hand
> back to the core once they are done in order to be able to build a
> proper synchronous API. So let's create a _xmit_error() helper.
>
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  include/net/mac802154.h | 10 ++++++++++
>  net/mac802154/util.c    | 10 ++++++++++
>  2 files changed, 20 insertions(+)
>
> diff --git a/include/net/mac802154.h b/include/net/mac802154.h
> index 2c3bbc6645ba..9fe8cfef1ba0 100644
> --- a/include/net/mac802154.h
> +++ b/include/net/mac802154.h
> @@ -498,4 +498,14 @@ 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_error - frame transmission failed
> + *
> + * @hw: pointer as obtained from ieee802154_alloc_hw().
> + * @skb: buffer for transmission
> + * @ifs_handling: indicate interframe space handling
> + */
> +void ieee802154_xmit_error(struct ieee802154_hw *hw, struct sk_buff *skb,
> +                          bool ifs_handling);
> +
>  #endif /* NET_MAC802154_H */
> diff --git a/net/mac802154/util.c b/net/mac802154/util.c
> index 6f82418e9dec..9016f634efba 100644
> --- a/net/mac802154/util.c
> +++ b/net/mac802154/util.c
> @@ -102,6 +102,16 @@ void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
>  }
>  EXPORT_SYMBOL(ieee802154_xmit_complete);
>
> +void ieee802154_xmit_error(struct ieee802154_hw *hw, struct sk_buff *skb,
> +                          bool ifs_handling)
> +{
> +       unsigned int skb_len = skb->len;
> +
> +       dev_kfree_skb_any(skb);
> +       ieee802154_xmit_end(hw, ifs_handling, skb_len);
> +}

Remove ieee802154_xmit_end() function and just call to wake up the
queue here, also drop the "ifs_handling" parameter here.

- Alex