net: airoha: Fix skb->priority underflow in airoha_dev_select_queue()

In airoha_dev_select_queue(), the expression:

  queue = (skb->priority - 1) % AIROHA_NUM_QOS_QUEUES;

implicitly converts to unsigned arithmetic: when skb->priority is 0
(the default for unclassified traffic), (0u - 1u) wraps to UINT_MAX,
and UINT_MAX % 8 = 7, routing default best-effort packets to the
highest-priority QoS queue. This causes QoS inversion where the
majority of traffic on a PON gateway starves actual high-priority
flows (VoIP, gaming, etc.).

The "- 1" offset was a leftover from the ETS offload implementation
that has since been removed. The correct mapping is a direct modulo:

  queue = skb->priority % AIROHA_NUM_QOS_QUEUES;

This maps priority 0 → queue 0 (lowest), priority 7 → queue 7
(highest), with higher priorities wrapping around. This is the
standard Linux sk_prio → HW queue mapping used by other drivers.

Fixes: 2b288b81560b ("net: airoha: Introduce ndo_select_queue callback")
Link: https://lore.kernel.org/netdev/178185573207.2378135.3729126358670287878@gmail.com/
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Joe Damato <joe@dama.to>
Signed-off-by: Wayen Yan <win847@gmail.com>
Link: https://patch.msgid.link/178194366700.2485734.5368768965976693502@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index 64dde6464f3fb12810616201f2d9100217648f0d..3370c3df7c107b45bedc961b6c7e7c66257fa660 100644 (file)
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -2110,7 +2110,7 @@ static u16 airoha_dev_select_queue(struct net_device *netdev,
         */
        channel = netdev_uses_dsa(netdev) ? skb_get_queue_mapping(skb) : port->id;
        channel = channel % AIROHA_NUM_QOS_CHANNELS;
-       queue = (skb->priority - 1) % AIROHA_NUM_QOS_QUEUES; /* QoS queue */
+       queue = skb->priority % AIROHA_NUM_QOS_QUEUES;
        queue = channel * AIROHA_NUM_QOS_QUEUES + queue;
 
        return queue < netdev->num_tx_queues ? queue : 0;