netdev - [PATCH wpan v2 4/6] mac802154: Send beacons using the MLME Tx path

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Date:   Tue, 14 Feb 2023 14:50:33 +0100
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>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, 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>,
        Guilhem Imberton <guilhem.imberton@...vo.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Alexander Aring <aahringo@...hat.com>
Subject: [PATCH wpan v2 4/6] mac802154: Send beacons using the MLME Tx path

Using ieee802154_subif_start_xmit() to bypass the net queue when
sending beacons is broken because it does not acquire the
HARD_TX_LOCK(), hence not preventing datagram buffers to be smashed by
beacons upon contention situation. Using the mlme_tx helper is not the
best fit either but at least it is not buggy and has little-to-no
performance hit. More details are given in the comment explaining this
choice in the code.

Fixes: 3accf4762734 ("mac802154: Handle basic beaconing")
Reported-by: Alexander Aring <aahringo@...hat.com>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 net/mac802154/scan.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/net/mac802154/scan.c b/net/mac802154/scan.c
index 8f98efec7753..fff41e59099e 100644
--- a/net/mac802154/scan.c
+++ b/net/mac802154/scan.c
@@ -326,7 +326,25 @@ static int mac802154_transmit_beacon(struct ieee802154_local *local,
 		return ret;
 	}
 
-	return ieee802154_subif_start_xmit(skb, sdata->dev);
+	/* Using the MLME transmission helper for sending beacons is a bit
+	 * overkill because we do not really care about the final outcome.
+	 *
+	 * Even though, going through the whole net stack with a regular
+	 * dev_queue_xmit() is not relevant either because we want beacons to be
+	 * sent "now" rather than go through the whole net stack scheduling
+	 * (qdisc & co).
+	 *
+	 * Finally, using ieee802154_subif_start_xmit() would only be an option
+	 * if we had a generic transmit helper which would acquire the
+	 * HARD_TX_LOCK() to prevent buffer handling conflicts with regular
+	 * packets.
+	 *
+	 * So for now we keep it simple and send beacons with our MLME helper,
+	 * even if it stops the ieee802154 queue entirely during these
+	 * transmissions, wich anyway does not have a huge impact on the
+	 * performances given the current design of the stack.
+	 */
+	return ieee802154_mlme_tx(local, sdata, skb);
 }
 
 void mac802154_beacon_worker(struct work_struct *work)
-- 
2.34.1