mlxsw: spectrum_flower: Add support for ip ttl

Support offloading rules that match on ip ttl.
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c

@@ -212,11 +212,39 @@ static int mlxsw_sp_flower_parse_tcp(struct mlxsw_sp *mlxsw_sp,
 	return 0;
 }
 
+static int mlxsw_sp_flower_parse_ip(struct mlxsw_sp *mlxsw_sp,
+				    struct mlxsw_sp_acl_rule_info *rulei,
+				    struct tc_cls_flower_offload *f,
+				    u16 n_proto)
+{
+	struct flow_dissector_key_ip *key, *mask;
+
+	if (!dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_IP))
+		return 0;
+
+	if (n_proto != ETH_P_IP && n_proto != ETH_P_IPV6) {
+		dev_err(mlxsw_sp->bus_info->dev, "IP keys supported only for IPv4/6\n");
+		return -EINVAL;
+	}
+
+	key = skb_flow_dissector_target(f->dissector,
+					FLOW_DISSECTOR_KEY_IP,
+					f->key);
+	mask = skb_flow_dissector_target(f->dissector,
+					 FLOW_DISSECTOR_KEY_IP,
+					 f->mask);
+	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_IP_TTL_,
+				       key->ttl, mask->ttl);
+	return 0;
+}
+
 static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 				 struct net_device *dev,
 				 struct mlxsw_sp_acl_rule_info *rulei,
 				 struct tc_cls_flower_offload *f)
 {
+	u16 n_proto_mask = 0;
+	u16 n_proto_key = 0;
 	u16 addr_type = 0;
 	u8 ip_proto = 0;
 	int err;
@@ -229,6 +257,7 @@ static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 	      BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
 	      BIT(FLOW_DISSECTOR_KEY_PORTS) |
 	      BIT(FLOW_DISSECTOR_KEY_TCP) |
+	      BIT(FLOW_DISSECTOR_KEY_IP) |
 	      BIT(FLOW_DISSECTOR_KEY_VLAN))) {
 		dev_err(mlxsw_sp->bus_info->dev, "Unsupported key\n");
 		return -EOPNOTSUPP;
@@ -253,8 +282,8 @@ static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 			skb_flow_dissector_target(f->dissector,
 						  FLOW_DISSECTOR_KEY_BASIC,
 						  f->mask);
-		u16 n_proto_key = ntohs(key->n_proto);
-		u16 n_proto_mask = ntohs(mask->n_proto);
+		n_proto_key = ntohs(key->n_proto);
+		n_proto_mask = ntohs(mask->n_proto);
 
 		if (n_proto_key == ETH_P_ALL) {
 			n_proto_key = 0;
@@ -324,6 +353,10 @@ static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 	if (err)
 		return err;
 
+	err = mlxsw_sp_flower_parse_ip(mlxsw_sp, rulei, f, n_proto_key & n_proto_mask);
+	if (err)
+		return err;
+
 	return mlxsw_sp_flower_parse_actions(mlxsw_sp, dev, rulei, f->exts);
 }