net: airoha: Rely on airoha_gdm_dev pointer in airoha_is_lan_gdm_port()

Rename airoha_is_lan_gdm_port in airoha_is_lan_gdm_dev. Moreover, rely
on airoha_gdm_dev pointer in airoha_is_lan_gdm_dev() instead of
airoha_gdm_port one.
This is a preliminary patch to support multiple net_devices connected to
the same GDM{3,4} port via an external hw arbiter.

Tested-by: Xuegang Lu <xuegang.lu@airoha.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260527-airoha-eth-multi-serdes-preliminary-v1-3-ec6ed73ef7fc@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: LorenzoBianconi

drivers/net/ethernet/airoha/airoha_eth.c

@@ -73,12 +73,10 @@ static void airoha_qdma_irq_disable(struct airoha_irq_bank *irq_bank,
 
 static void airoha_set_macaddr(struct airoha_gdm_dev *dev, const u8 *addr)
 {
-	struct airoha_gdm_port *port = dev->port;
 	struct airoha_eth *eth = dev->eth;
 	u32 val, reg;
 
-	reg = airoha_is_lan_gdm_port(port) ? REG_FE_LAN_MAC_H
-					   : REG_FE_WAN_MAC_H;
+	reg = airoha_is_lan_gdm_dev(dev) ? REG_FE_LAN_MAC_H : REG_FE_WAN_MAC_H;
 	val = (addr[0] << 16) | (addr[1] << 8) | addr[2];
 	airoha_fe_wr(eth, reg, val);
 
@@ -1868,7 +1866,7 @@ static int airoha_dev_init(struct net_device *netdev)
 	int i;
 
 	/* QDMA0 is used for lan ports while QDMA1 is used for WAN ports */
-	dev->qdma = &eth->qdma[!airoha_is_lan_gdm_port(port)];
+	dev->qdma = &eth->qdma[!airoha_is_lan_gdm_dev(dev)];
 	dev->dev->irq = dev->qdma->irq_banks[0].irq;
 	airoha_set_macaddr(dev, netdev->dev_addr);
 

drivers/net/ethernet/airoha/airoha_eth.h

@@ -647,8 +647,10 @@ static inline u16 airoha_qdma_get_txq(struct airoha_qdma *qdma, u16 qid)
 	return qid % ARRAY_SIZE(qdma->q_tx);
 }
 
-static inline bool airoha_is_lan_gdm_port(struct airoha_gdm_port *port)
+static inline bool airoha_is_lan_gdm_dev(struct airoha_gdm_dev *dev)
 {
+	struct airoha_gdm_port *port = dev->port;
+
 	/* GDM1 port on EN7581 SoC is connected to the lan dsa switch.
 	 * GDM{2,3,4} can be used as wan port connected to an external
 	 * phy module.

drivers/net/ethernet/airoha/airoha_ppe.c

@@ -362,7 +362,7 @@ static int airoha_ppe_foe_entry_prepare(struct airoha_eth *eth,
 			/* For downlink traffic consume SRAM memory for hw
 			 * forwarding descriptors queue.
 			 */
-			if (airoha_is_lan_gdm_port(port))
+			if (airoha_is_lan_gdm_dev(dev))
 				val |= AIROHA_FOE_IB2_FAST_PATH;
 			if (dsa_port >= 0)
 				val |= FIELD_PREP(AIROHA_FOE_IB2_NBQ,