flow_offload: return EOPNOTSUPP for the unsupported mpls action type

stable inclusion
from stable-v5.10.88
commit 67f4362ae286eb7a87d18d24f585c85bf9c7d694
bugzilla: 186058 https://gitee.com/openeuler/kernel/issues/I4QW6A

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=67f4362ae286eb7a87d18d24f585c85bf9c7d694

--------------------------------

[ Upstream commit 166b6a46 ]

We need to return EOPNOTSUPP for the unsupported mpls action type when
setup the flow action.

In the original implement, we will return 0 for the unsupported mpls
action type, actually we do not setup it and the following actions
to the flow action entry.

Fixes: 9838b20a ("net: sched: take rtnl lock in tc_setup_flow_action()")
Signed-off-by: NBaowen Zheng <baowen.zheng@corigine.com>
Signed-off-by: NSimon Horman <simon.horman@corigine.com>
Acked-by: NJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

net/sched/cls_api.c

@@ -3703,6 +3703,7 @@ int tc_setup_flow_action(struct flow_action *flow_action,
 				entry->mpls_mangle.ttl = tcf_mpls_ttl(act);
 				break;
 			default:
+				err = -EOPNOTSUPP;
 				goto err_out_locked;
 			}
 		} else if (is_tcf_skbedit_ptype(act)) {