Commit bde000ae authored by Miquel Raynal's avatar Miquel Raynal Committed by Stefan Schmidt
Browse files

net: mac802154: Follow the count of ongoing transmissions 



In order to create a synchronous API for MLME command purposes, we need
to be able to track the end of the ongoing transmissions. Let's
introduce an atomic variable which is incremented when a transmission
starts and decremented when relevant so that we know at any moment
whether there is an ongoing transmission.

The counter gets decremented in the following situations:
- The operation is asynchronous and there was a failure during the
  offloading process.
- The operation is synchronous and the synchronous operation failed.
- The operation finished, either successfully or not.

Signed-off-by: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Acked-by: default avatarAlexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-5-miquel.raynal@bootlin.com


Signed-off-by: default avatarStefan Schmidt <stefan@datenfreihafen.org>
parent d08d951a

include/net/cfg802154.h

+3 −0
Original line number Diff line number Diff line
@@ -214,6 +214,9 @@ struct wpan_phy { 
	/* the network namespace this phy lives in currently */

	possible_net_t _net;



	/* Transmission monitoring */

	atomic_t ongoing_txs;



	char priv[] __aligned(NETDEV_ALIGN);

};

net/mac802154/tx.c

+3 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ void ieee802154_xmit_sync_worker(struct work_struct *work) 
err_tx:

	/* Restart the netif queue on each sub_if_data object. */

	ieee802154_wake_queue(&local->hw);

	atomic_dec(&local->phy->ongoing_txs);

	kfree_skb(skb);

	netdev_dbg(dev, "transmission failed\n");

}
@@ -75,6 +76,7 @@ ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb) 


	/* Stop the netif queue on each sub_if_data object. */

	ieee802154_stop_queue(&local->hw);

	atomic_inc(&local->phy->ongoing_txs);



	/* Drivers should preferably implement the async callback. In some rare

	 * cases they only provide a sync callback which we will use as a
@@ -98,6 +100,7 @@ ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb) 


err_wake_netif_queue:

	ieee802154_wake_queue(&local->hw);

	atomic_dec(&local->phy->ongoing_txs);

err_free_skb:

	kfree_skb(skb);

	return NETDEV_TX_OK;

net/mac802154/util.c

+2 −0
Original line number Diff line number Diff line
@@ -88,6 +88,7 @@ void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb, 
	}



	dev_consume_skb_any(skb);

	atomic_dec(&hw->phy->ongoing_txs);

}

EXPORT_SYMBOL(ieee802154_xmit_complete);
@@ -99,6 +100,7 @@ void ieee802154_xmit_error(struct ieee802154_hw *hw, struct sk_buff *skb, 
	local->tx_result = reason;

	ieee802154_wake_queue(hw);

	dev_kfree_skb_any(skb);

	atomic_dec(&hw->phy->ongoing_txs);

}

EXPORT_SYMBOL(ieee802154_xmit_error);