net: ethernet: mtk_eth_soc: add flow offloading support

This adds support for offloading IPv4 routed flows, including SNAT/DNAT,
one VLAN, PPPoE and DSA.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mediatek/Makefile

@@ -4,5 +4,5 @@
 #
 
 obj-$(CONFIG_NET_MEDIATEK_SOC) += mtk_eth.o
-mtk_eth-y := mtk_eth_soc.o mtk_sgmii.o mtk_eth_path.o mtk_ppe.o mtk_ppe_debugfs.o
+mtk_eth-y := mtk_eth_soc.o mtk_sgmii.o mtk_eth_path.o mtk_ppe.o mtk_ppe_debugfs.o mtk_ppe_offload.o
 obj-$(CONFIG_NET_MEDIATEK_STAR_EMAC) += mtk_star_emac.o

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -2843,6 +2843,7 @@ static const struct net_device_ops mtk_netdev_ops = {
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= mtk_poll_controller,
 #endif
+	.ndo_setup_tc		= mtk_eth_setup_tc,
 };
 
 static int mtk_add_mac(struct mtk_eth *eth, struct device_node *np)
@@ -3104,6 +3105,10 @@ static int mtk_probe(struct platform_device *pdev)
 				   eth->base + MTK_ETH_PPE_BASE, 2);
 		if (err)
 			goto err_free_dev;
+
+		err = mtk_eth_offload_init(eth);
+		if (err)
+			goto err_free_dev;
 	}
 
 	for (i = 0; i < MTK_MAX_DEVS; i++) {

drivers/net/ethernet/mediatek/mtk_eth_soc.h

@@ -15,6 +15,7 @@
 #include <linux/u64_stats_sync.h>
 #include <linux/refcount.h>
 #include <linux/phylink.h>
+#include <linux/rhashtable.h>
 #include "mtk_ppe.h"
 
 #define MTK_QDMA_PAGE_SIZE	2048
@@ -41,7 +42,8 @@
 				 NETIF_F_HW_VLAN_CTAG_RX | \
 				 NETIF_F_SG | NETIF_F_TSO | \
 				 NETIF_F_TSO6 | \
-				 NETIF_F_IPV6_CSUM)
+				 NETIF_F_IPV6_CSUM |\
+				 NETIF_F_HW_TC)
 #define MTK_HW_FEATURES_MT7628	(NETIF_F_SG | NETIF_F_RXCSUM)
 #define NEXT_DESP_IDX(X, Y)	(((X) + 1) & ((Y) - 1))
 
@@ -914,6 +916,7 @@ struct mtk_eth {
 	int				ip_align;
 
 	struct mtk_ppe			ppe;
+	struct rhashtable		flow_table;
 };
 
 /* struct mtk_mac -	the structure that holds the info about the MACs of the
@@ -958,4 +961,9 @@ int mtk_gmac_sgmii_path_setup(struct mtk_eth *eth, int mac_id);
 int mtk_gmac_gephy_path_setup(struct mtk_eth *eth, int mac_id);
 int mtk_gmac_rgmii_path_setup(struct mtk_eth *eth, int mac_id);
 
+int mtk_eth_offload_init(struct mtk_eth *eth);
+int mtk_eth_setup_tc(struct net_device *dev, enum tc_setup_type type,
+		     void *type_data);
+
+
 #endif /* MTK_ETH_H */