[PATCH net-next] net: airoha: add preliminary support to configure tx hw QoS queue during flowtable offloading

[Lorenzo Bianconi <lorenzo@kernel.org>]

Add the plumbing to program the AIROHA_FOE_QID field in the PPE FOE
entry with a per-flow priority value during flowtable offload. This
allows the hardware to steer offloaded flows to a specific QoS queue
on the egress QDMA block for traffic forwarded between two interfaces
via hardware acceleration, bypassing the kernel forwarding path.
The priority parameter is currently always zero because netfilter does
not yet provide a mechanism to pass the skb priority field to the
flowtable offload driver. Once that support is added in the netfilter
subsystem, the driver will be able to extract the priority from the
flow rule and map it to the appropriate hardware queue.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 drivers/net/ethernet/airoha/airoha_ppe.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
index e7c78293002a..fdb973fc779c 100644
--- a/drivers/net/ethernet/airoha/airoha_ppe.c
+++ b/drivers/net/ethernet/airoha/airoha_ppe.c
@@ -331,7 +331,7 @@ static int airoha_ppe_foe_entry_prepare(struct airoha_eth *eth,
 					struct airoha_foe_entry *hwe,
 					struct net_device *netdev, int type,
 					struct airoha_flow_data *data,
-					int l4proto)
+					int l4proto, u8 priority)
 {
 	u32 qdata = FIELD_PREP(AIROHA_FOE_SHAPER_ID, 0x7f), ports_pad, val;
 	int wlan_etype = -EINVAL, dsa_port = airoha_get_dsa_port(&netdev);
@@ -386,7 +386,9 @@ static int airoha_ppe_foe_entry_prepare(struct airoha_eth *eth,
 			 */
 			channel = dsa_port >= 0 ? dsa_port : port->id;
 			channel = channel % AIROHA_NUM_QOS_CHANNELS;
-			qdata |= FIELD_PREP(AIROHA_FOE_CHANNEL, channel);
+			priority = priority % AIROHA_NUM_QOS_QUEUES;
+			qdata |= FIELD_PREP(AIROHA_FOE_CHANNEL, channel) |
+				 FIELD_PREP(AIROHA_FOE_QID, priority);
 
 			val |= FIELD_PREP(AIROHA_FOE_IB2_PSE_PORT, pse_port) |
 			       AIROHA_FOE_IB2_PSE_QOS;
@@ -1079,10 +1081,10 @@ static int airoha_ppe_flow_offload_replace(struct airoha_eth *eth,
 	struct airoha_flow_data data = {};
 	struct net_device *odev = NULL;
 	struct flow_action_entry *act;
+	u8 l4proto = 0, priority = 0;
 	struct airoha_foe_entry hwe;
 	int err, i, offload_type;
 	u16 addr_type = 0;
-	u8 l4proto = 0;
 
 	if (rhashtable_lookup(&eth->flow_table, &f->cookie,
 			      airoha_flow_table_params))
@@ -1177,7 +1179,7 @@ static int airoha_ppe_flow_offload_replace(struct airoha_eth *eth,
 		return -EINVAL;
 
 	err = airoha_ppe_foe_entry_prepare(eth, &hwe, odev, offload_type,
-					   &data, l4proto);
+					   &data, l4proto, priority);
 	if (err)
 		return err;
 

---
base-commit: 9507d09b2b8fc775652f5c5670028daa9d83a2bd
change-id: 20260703-airoha-hw-qos-queue-stub-939714339f28

Best regards,
-- 
Lorenzo Bianconi <lorenzo@kernel.org>