net: stmmac: Add support for SA Insertion/Replacement in GMAC4+

Add the support for Source Address Insertion and Replacement in GMAC4
and GMAC5 cores. Two methods are supported: Descriptor based and
register based.
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/dwmac4.h

@@ -160,6 +160,8 @@ enum power_event {
 #define GMAC_DEBUG_RPESTS		BIT(0)
 
 /* MAC config */
+#define GMAC_CONFIG_SARC		GENMASK(30, 28)
+#define GMAC_CONFIG_SARC_SHIFT		28
 #define GMAC_CONFIG_IPC			BIT(27)
 #define GMAC_CONFIG_2K			BIT(22)
 #define GMAC_CONFIG_ACS			BIT(20)
@@ -175,6 +177,7 @@ enum power_event {
 #define GMAC_CONFIG_RE			BIT(0)
 
 /* MAC HW features0 bitmap */
+#define GMAC_HW_FEAT_SAVLANINS		BIT(27)
 #define GMAC_HW_FEAT_ADDMAC		BIT(18)
 #define GMAC_HW_FEAT_RXCOESEL		BIT(16)
 #define GMAC_HW_FEAT_TXCOSEL		BIT(14)

drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c

@@ -759,6 +759,16 @@ static void dwmac4_update_vlan_hash(struct mac_device_info *hw, u32 hash,
 	}
 }
 
+static void dwmac4_sarc_configure(void __iomem *ioaddr, int val)
+{
+	u32 value = readl(ioaddr + GMAC_CONFIG);
+
+	value &= ~GMAC_CONFIG_SARC;
+	value |= val << GMAC_CONFIG_SARC_SHIFT;
+
+	writel(value, ioaddr + GMAC_CONFIG);
+}
+
 const struct stmmac_ops dwmac4_ops = {
 	.core_init = dwmac4_core_init,
 	.set_mac = stmmac_set_mac,
@@ -790,6 +800,7 @@ const struct stmmac_ops dwmac4_ops = {
 	.set_filter = dwmac4_set_filter,
 	.set_mac_loopback = dwmac4_set_mac_loopback,
 	.update_vlan_hash = dwmac4_update_vlan_hash,
+	.sarc_configure = dwmac4_sarc_configure,
 };
 
 const struct stmmac_ops dwmac410_ops = {
@@ -823,6 +834,7 @@ const struct stmmac_ops dwmac410_ops = {
 	.set_filter = dwmac4_set_filter,
 	.set_mac_loopback = dwmac4_set_mac_loopback,
 	.update_vlan_hash = dwmac4_update_vlan_hash,
+	.sarc_configure = dwmac4_sarc_configure,
 };
 
 const struct stmmac_ops dwmac510_ops = {
@@ -861,6 +873,7 @@ const struct stmmac_ops dwmac510_ops = {
 	.flex_pps_config = dwmac5_flex_pps_config,
 	.set_mac_loopback = dwmac4_set_mac_loopback,
 	.update_vlan_hash = dwmac4_update_vlan_hash,
+	.sarc_configure = dwmac4_sarc_configure,
 };
 
 int dwmac4_setup(struct stmmac_priv *priv)

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

@@ -443,6 +443,13 @@ static void dwmac4_clear(struct dma_desc *p)
 	p->des3 = 0;
 }
 
+static void dwmac4_set_sarc(struct dma_desc *p, u32 sarc_type)
+{
+	sarc_type <<= TDES3_SA_INSERT_CTRL_SHIFT;
+
+	p->des3 |= cpu_to_le32(sarc_type & TDES3_SA_INSERT_CTRL_MASK);
+}
+
 static int set_16kib_bfsize(int mtu)
 {
 	int ret = 0;
@@ -476,6 +483,7 @@ const struct stmmac_desc_ops dwmac4_desc_ops = {
 	.get_addr = dwmac4_get_addr,
 	.set_addr = dwmac4_set_addr,
 	.clear = dwmac4_clear,
+	.set_sarc = dwmac4_set_sarc,
 };
 
 const struct stmmac_mode_ops dwmac4_ring_mode_ops = {

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

@@ -32,6 +32,7 @@
 #define TDES3_HDR_LEN_SHIFT		19
 #define TDES3_SLOT_NUMBER_MASK		GENMASK(22, 19)
 #define TDES3_SA_INSERT_CTRL_MASK	GENMASK(25, 23)
+#define TDES3_SA_INSERT_CTRL_SHIFT	23
 #define TDES3_CRC_PAD_CTRL_MASK		GENMASK(27, 26)
 
 /* TDES3 (write back format) */

drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c

@@ -348,6 +348,7 @@ static void dwmac4_get_hw_feature(void __iomem *ioaddr,
 	/* TX and RX csum */
 	dma_cap->tx_coe = (hw_cap & GMAC_HW_FEAT_TXCOSEL) >> 14;
 	dma_cap->rx_coe =  (hw_cap & GMAC_HW_FEAT_RXCOESEL) >> 16;
+	dma_cap->vlins = (hw_cap & GMAC_HW_FEAT_SAVLANINS) >> 27;
 
 	/* MAC HW feature1 */
 	hw_cap = readl(ioaddr + GMAC_HW_FEATURE1);