netdev - [PATCH v5 04/11] net: mac802154: Create a transmit error helper

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Message-Id: <20220406153441.1667375-5-miquel.raynal@bootlin.com>
Date:   Wed,  6 Apr 2022 17:34:34 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, 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>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH v5 04/11] net: mac802154: Create a transmit error helper

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 and take
this opportunity to fill the new device-global field storing Tx
statuses.

Suggested-by: Alexander Aring <alex.aring@...il.com>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 include/net/mac802154.h | 10 ++++++++++
 net/mac802154/util.c    | 11 +++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index 2c3bbc6645ba..abbe88dc9df5 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
+ * @reason: error code
+ */
+void ieee802154_xmit_error(struct ieee802154_hw *hw, struct sk_buff *skb,
+			   int reason);
+
 #endif /* NET_MAC802154_H */
diff --git a/net/mac802154/util.c b/net/mac802154/util.c
index 0bf46f174de3..ec523335336c 100644
--- a/net/mac802154/util.c
+++ b/net/mac802154/util.c
@@ -91,6 +91,17 @@ 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,
+			   int reason)
+{
+	struct ieee802154_local *local = hw_to_local(hw);
+
+	local->tx_result = reason;
+	ieee802154_wake_queue(hw);
+	dev_kfree_skb_any(skb);
+}
+EXPORT_SYMBOL(ieee802154_xmit_error);
+
 void ieee802154_stop_device(struct ieee802154_local *local)
 {
 	flush_workqueue(local->workqueue);
-- 
2.27.0