netdev - [PATCH net] net: airoha: Do not loopback traffic to GDM2 if it is available on the device

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Message-Id: <20251113-airoha-hw-offload-gdm2-fix-v1-1-7e4ca300872f@kernel.org>
Date: Thu, 13 Nov 2025 18:19:38 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org, 
 Lorenzo Bianconi <lorenzo@...nel.org>
Subject: [PATCH net] net: airoha: Do not loopback traffic to GDM2 if it is
 available on the device

Airoha_eth driver forwards offloaded uplink traffic (packets received on
GDM1 and forwarded to GDM{3,4}) to GDM2 in order to apply hw QoS.
This is correct if the device does not support a dedicated GDM2 port. In
this case, in order to enable hw offloading for uplink traffic, the
packets should be sent to GDM{3,4} directly.

Fixes: 9cd451d414f6 ("net: airoha: Add loopback support for GDM2")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/airoha/airoha_ppe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
index c373f21d95f5a610deae365c64bc589c21f5e1a0..0caabb0c3aa06948e46ad087c50eba5babc81994 100644
--- a/drivers/net/ethernet/airoha/airoha_ppe.c
+++ b/drivers/net/ethernet/airoha/airoha_ppe.c
@@ -308,7 +308,7 @@ static int airoha_ppe_foe_entry_prepare(struct airoha_eth *eth,
 			if (!airoha_is_valid_gdm_port(eth, port))
 				return -EINVAL;

-			if (dsa_port >= 0)
+			if (dsa_port >= 0 || eth->ports[1])
 				pse_port = port->id == 4 ? FE_PSE_PORT_GDM4
 							 : port->id;
 			else

---
base-commit: f694d215d34035cc64b1d176fd82db0d1f2428d4
change-id: 20251113-airoha-hw-offload-gdm2-fix-29f4f8df05bf

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