Patch "tsnep: Fix TX queue stop/wake for multiple queues" has been added to the 6.1-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    tsnep: Fix TX queue stop/wake for multiple queues

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tsnep-fix-tx-queue-stop-wake-for-multiple-queues.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 0bd0a3577641b24250a58a89f8fd357026803a42
Author: Gerhard Engleder <gerhard@xxxxxxxxxxxxxxxxxxxxx>
Date:   Tue Jan 24 20:14:40 2023 +0100

    tsnep: Fix TX queue stop/wake for multiple queues
    
    [ Upstream commit 3d53aaef4332245044b2f3688ac0ea10436c719c ]
    
    netif_stop_queue() and netif_wake_queue() act on TX queue 0. This is ok
    as long as only a single TX queue is supported. But support for multiple
    TX queues was introduced with 762031375d5c and I missed to adapt stop
    and wake of TX queues.
    
    Use netif_stop_subqueue() and netif_tx_wake_queue() to act on specific
    TX queue.
    
    Fixes: 762031375d5c ("tsnep: Support multiple TX/RX queue pairs")
    Signed-off-by: Gerhard Engleder <gerhard@xxxxxxxxxxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230124191440.56887-1-gerhard@xxxxxxxxxxxxxxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index 13d5ff4e0e02..6bf3cc11d212 100644
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -419,7 +419,7 @@ static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb,
 		/* ring full, shall not happen because queue is stopped if full
 		 * below
 		 */
-		netif_stop_queue(tx->adapter->netdev);
+		netif_stop_subqueue(tx->adapter->netdev, tx->queue_index);
 
 		spin_unlock_irqrestore(&tx->lock, flags);
 
@@ -462,7 +462,7 @@ static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb,
 
 	if (tsnep_tx_desc_available(tx) < (MAX_SKB_FRAGS + 1)) {
 		/* ring can get full with next frame */
-		netif_stop_queue(tx->adapter->netdev);
+		netif_stop_subqueue(tx->adapter->netdev, tx->queue_index);
 	}
 
 	spin_unlock_irqrestore(&tx->lock, flags);
@@ -472,11 +472,14 @@ static netdev_tx_t tsnep_xmit_frame_ring(struct sk_buff *skb,
 
 static bool tsnep_tx_poll(struct tsnep_tx *tx, int napi_budget)
 {
+	struct tsnep_tx_entry *entry;
+	struct netdev_queue *nq;
 	unsigned long flags;
 	int budget = 128;
-	struct tsnep_tx_entry *entry;
-	int count;
 	int length;
+	int count;
+
+	nq = netdev_get_tx_queue(tx->adapter->netdev, tx->queue_index);
 
 	spin_lock_irqsave(&tx->lock, flags);
 
@@ -533,8 +536,8 @@ static bool tsnep_tx_poll(struct tsnep_tx *tx, int napi_budget)
 	} while (likely(budget));
 
 	if ((tsnep_tx_desc_available(tx) >= ((MAX_SKB_FRAGS + 1) * 2)) &&
-	    netif_queue_stopped(tx->adapter->netdev)) {
-		netif_wake_queue(tx->adapter->netdev);
+	    netif_tx_queue_stopped(nq)) {
+		netif_tx_wake_queue(nq);
 	}
 
 	spin_unlock_irqrestore(&tx->lock, flags);