net: stmmac: Add support for SA Insertion/Replacement in XGMAC cores

Add the support for Source Address Insertion and Replacement in XGMAC
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/dwxgmac2.h

@@ -337,6 +337,8 @@
 #define XGMAC_TDES3_CPC			GENMASK(27, 26)
 #define XGMAC_TDES3_CPC_SHIFT		26
 #define XGMAC_TDES3_TCMSSV		BIT(26)
+#define XGMAC_TDES3_SAIC		GENMASK(25, 23)
+#define XGMAC_TDES3_SAIC_SHIFT		23
 #define XGMAC_TDES3_THL			GENMASK(22, 19)
 #define XGMAC_TDES3_THL_SHIFT		19
 #define XGMAC_TDES3_TSE			BIT(18)

drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c

@@ -1075,6 +1075,16 @@ static int dwxgmac2_flex_pps_config(void __iomem *ioaddr, int index,
 	return 0;
 }
 
+static void dwxgmac2_sarc_configure(void __iomem *ioaddr, int val)
+{
+	u32 value = readl(ioaddr + XGMAC_TX_CONFIG);
+
+	value &= ~XGMAC_CONFIG_SARC;
+	value |= val << XGMAC_CONFIG_SARC_SHIFT;
+
+	writel(value, ioaddr + XGMAC_TX_CONFIG);
+}
+
 const struct stmmac_ops dwxgmac210_ops = {
 	.core_init = dwxgmac2_core_init,
 	.set_mac = dwxgmac2_set_mac,
@@ -1113,6 +1123,7 @@ const struct stmmac_ops dwxgmac210_ops = {
 	.rxp_config = dwxgmac3_rxp_config,
 	.get_mac_tx_timestamp = dwxgmac2_get_mac_tx_timestamp,
 	.flex_pps_config = dwxgmac2_flex_pps_config,
+	.sarc_configure = dwxgmac2_sarc_configure,
 };
 
 int dwxgmac2_setup(struct stmmac_priv *priv)

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

@@ -148,7 +148,7 @@ static void dwxgmac2_prepare_tx_desc(struct dma_desc *p, int is_fs, int len,
 
 	p->des2 |= cpu_to_le32(len & XGMAC_TDES2_B1L);
 
-	tdes3 = tot_pkt_len & XGMAC_TDES3_FL;
+	tdes3 |= tot_pkt_len & XGMAC_TDES3_FL;
 	if (is_fs)
 		tdes3 |= XGMAC_TDES3_FD;
 	else
@@ -298,6 +298,13 @@ static void dwxgmac2_set_sec_addr(struct dma_desc *p, dma_addr_t addr)
 	p->des3 = cpu_to_le32(upper_32_bits(addr));
 }
 
+static void dwxgmac2_set_sarc(struct dma_desc *p, u32 sarc_type)
+{
+	sarc_type <<= XGMAC_TDES3_SAIC_SHIFT;
+
+	p->des3 |= cpu_to_le32(sarc_type & XGMAC_TDES3_SAIC);
+}
+
 const struct stmmac_desc_ops dwxgmac210_desc_ops = {
 	.tx_status = dwxgmac2_get_tx_status,
 	.rx_status = dwxgmac2_get_rx_status,
@@ -324,4 +331,5 @@ const struct stmmac_desc_ops dwxgmac210_desc_ops = {
 	.get_rx_hash = dwxgmac2_get_rx_hash,
 	.get_rx_header_len = dwxgmac2_get_rx_header_len,
 	.set_sec_addr = dwxgmac2_set_sec_addr,
+	.set_sarc = dwxgmac2_set_sarc,
 };

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

@@ -91,6 +91,7 @@ struct stmmac_desc_ops {
 			   enum pkt_hash_types *type);
 	int (*get_rx_header_len)(struct dma_desc *p, unsigned int *len);
 	void (*set_sec_addr)(struct dma_desc *p, dma_addr_t addr);
+	void (*set_sarc)(struct dma_desc *p, u32 sarc_type);
 };
 
 #define stmmac_init_rx_desc(__priv, __args...) \
@@ -147,6 +148,8 @@ struct stmmac_desc_ops {
 	stmmac_do_callback(__priv, desc, get_rx_header_len, __args)
 #define stmmac_set_desc_sec_addr(__priv, __args...) \
 	stmmac_do_void_callback(__priv, desc, set_sec_addr, __args)
+#define stmmac_set_desc_sarc(__priv, __args...) \
+	stmmac_do_void_callback(__priv, desc, set_sarc, __args)
 
 struct stmmac_dma_cfg;
 struct dma_features;
@@ -350,6 +353,8 @@ struct stmmac_ops {
 				 bool is_double);
 	/* TX Timestamp */
 	int (*get_mac_tx_timestamp)(struct mac_device_info *hw, u64 *ts);
+	/* Source Address Insertion / Replacement */
+	void (*sarc_configure)(void __iomem *ioaddr, int val);
 };
 
 #define stmmac_core_init(__priv, __args...) \
@@ -426,6 +431,8 @@ struct stmmac_ops {
 	stmmac_do_void_callback(__priv, mac, update_vlan_hash, __args)
 #define stmmac_get_mac_tx_timestamp(__priv, __args...) \
 	stmmac_do_callback(__priv, mac, get_mac_tx_timestamp, __args)
+#define stmmac_sarc_configure(__priv, __args...) \
+	stmmac_do_void_callback(__priv, mac, sarc_configure, __args)
 
 /* PTP and HW Timer helpers */
 struct stmmac_hwtimestamp {

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

@@ -139,6 +139,7 @@ struct stmmac_priv {
 	bool tx_path_in_lpi_mode;
 	bool tso;
 	int sph;
+	u32 sarc_type;
 
 	unsigned int dma_buf_sz;
 	unsigned int rx_copybreak;

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

@@ -3004,6 +3004,9 @@ static netdev_tx_t stmmac_tso_xmit(struct sk_buff *skb, struct net_device *dev)
 		priv->xstats.tx_set_ic_bit++;
 	}
 
+	if (priv->sarc_type)
+		stmmac_set_desc_sarc(priv, first, priv->sarc_type);
+
 	skb_tx_timestamp(skb);
 
 	if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
@@ -3217,6 +3220,9 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 		priv->xstats.tx_set_ic_bit++;
 	}
 
+	if (priv->sarc_type)
+		stmmac_set_desc_sarc(priv, first, priv->sarc_type);
+
 	skb_tx_timestamp(skb);
 
 	/* Ready to fill the first descriptor and set the OWN bit w/o any