net: ethernet: mtk_eth_soc: add missing ipv6 flow offload support

Signed-off-by: David Bentham <db260179@gmail.com>

target/linux/generic/pending-5.10/610-net-ethernet-mtk_eth_soc-add-ipv6-flow-offloading-support.patch

+--- a/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
++++ b/drivers/net/ethernet/mediatek/mtk_ppe_offload.c
+@@ -7,6 +7,7 @@
+ #include <linux/rhashtable.h>
+ #include <linux/if_ether.h>
+ #include <linux/ip.h>
++#include <linux/ipv6.h>
+ #include <net/flow_offload.h>
+ #include <net/pkt_cls.h>
+ #include <net/dsa.h>
+@@ -20,6 +21,11 @@ struct mtk_flow_data {
+ 			__be32 src_addr;
+ 			__be32 dst_addr;
+ 		} v4;
++
++		struct {
++			struct in6_addr src_addr;
++			struct in6_addr dst_addr;
++		} v6;
+ 	};
+ 
+ 	__be16 src_port;
+@@ -64,6 +70,14 @@ mtk_flow_set_ipv4_addr(struct mtk_foe_en
+ 					    data->v4.dst_addr, data->dst_port);
+ }
+ 
++static int
++mtk_flow_set_ipv6_addr(struct mtk_foe_entry *foe, struct mtk_flow_data *data)
++{
++	return mtk_foe_entry_set_ipv6_tuple(foe,
++					    data->v6.src_addr.s6_addr32, data->src_port,
++					    data->v6.dst_addr.s6_addr32, data->dst_port);
++}
++
+ static void
+ mtk_flow_offload_mangle_eth(const struct flow_action_entry *act, void *eth)
+ {
+@@ -251,6 +265,9 @@ mtk_flow_offload_replace(struct mtk_eth
+ 	case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
+ 		offload_type = MTK_PPE_PKT_TYPE_IPV4_HNAPT;
+ 		break;
++	case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
++		offload_type = MTK_PPE_PKT_TYPE_IPV6_ROUTE_5T;
++		break;
+ 	default:
+ 		return -EOPNOTSUPP;
+ 	}
+@@ -286,6 +303,17 @@ mtk_flow_offload_replace(struct mtk_eth
+ 		mtk_flow_set_ipv4_addr(&foe, &data, false);
+ 	}
+ 
++	if (addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
++		struct flow_match_ipv6_addrs addrs;
++
++		flow_rule_match_ipv6_addrs(rule, &addrs);
++
++		data.v6.src_addr = addrs.key->src;
++		data.v6.dst_addr = addrs.key->dst;
++
++		mtk_flow_set_ipv6_addr(&foe, &data);
++	}
++
+ 	flow_action_for_each(i, act, &rule->action) {
+ 		if (act->id != FLOW_ACTION_MANGLE)
+ 			continue;