net: stmmac: Batch set RX OWN flag and other flags

Minimize access to the RX descriptor by collecting all the flags in a
local variable and then updating the descriptor at once.
Signed-off-by: Tan En De <ende.tan@starfivetech.com>
Link: https://patch.msgid.link/20240831011114.2065912-1-ende.tan@starfivetech.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c

@@ -186,10 +186,12 @@ static void dwmac4_set_tx_owner(struct dma_desc *p)
 
 static void dwmac4_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
 {
-	p->des3 |= cpu_to_le32(RDES3_OWN | RDES3_BUFFER1_VALID_ADDR);
+	u32 flags = (RDES3_OWN | RDES3_BUFFER1_VALID_ADDR);
 
 	if (!disable_rx_ic)
-		p->des3 |= cpu_to_le32(RDES3_INT_ON_COMPLETION_EN);
+		flags |= RDES3_INT_ON_COMPLETION_EN;
+
+	p->des3 |= cpu_to_le32(flags);
 }
 
 static int dwmac4_get_tx_ls(struct dma_desc *p)

drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c

@@ -56,10 +56,12 @@ static void dwxgmac2_set_tx_owner(struct dma_desc *p)
 
 static void dwxgmac2_set_rx_owner(struct dma_desc *p, int disable_rx_ic)
 {
-	p->des3 |= cpu_to_le32(XGMAC_RDES3_OWN);
+	u32 flags = XGMAC_RDES3_OWN;
 
 	if (!disable_rx_ic)
-		p->des3 |= cpu_to_le32(XGMAC_RDES3_IOC);
+		flags |= XGMAC_RDES3_IOC;
+
+	p->des3 |= cpu_to_le32(flags);
 }
 
 static int dwxgmac2_get_tx_ls(struct dma_desc *p)