mlxsw: spectrum_matchall: Perform protocol check earlier

Perform the protocol check earlier in the function instead of repeating
it for every action. Example:

 # tc filter add dev swp1 ingress proto ip matchall skip_sw action sample group 1 rate 100
 Error: matchall rules only supported with 'all' protocol.
 We have an error talking to the kernel
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -238,6 +238,11 @@ int mlxsw_sp_mall_replace(struct mlxsw_sp *mlxsw_sp,
 		flower_prio_valid = true;
 	}
 
+	if (protocol != htons(ETH_P_ALL)) {
+		NL_SET_ERR_MSG(f->common.extack, "matchall rules only supported with 'all' protocol");
+		return -EOPNOTSUPP;
+	}
+
 	mall_entry = kzalloc(sizeof(*mall_entry), GFP_KERNEL);
 	if (!mall_entry)
 		return -ENOMEM;
@@ -247,7 +252,7 @@ int mlxsw_sp_mall_replace(struct mlxsw_sp *mlxsw_sp,
 
 	act = &f->rule->action.entries[0];
 
-	if (act->id == FLOW_ACTION_MIRRED && protocol == htons(ETH_P_ALL)) {
+	if (act->id == FLOW_ACTION_MIRRED) {
 		if (flower_prio_valid && mall_entry->ingress &&
 		    mall_entry->priority >= flower_min_prio) {
 			NL_SET_ERR_MSG(f->common.extack, "Failed to add behind existing flower rules");
@@ -262,8 +267,7 @@ int mlxsw_sp_mall_replace(struct mlxsw_sp *mlxsw_sp,
 		}
 		mall_entry->type = MLXSW_SP_MALL_ACTION_TYPE_MIRROR;
 		mall_entry->mirror.to_dev = act->dev;
-	} else if (act->id == FLOW_ACTION_SAMPLE &&
-		   protocol == htons(ETH_P_ALL)) {
+	} else if (act->id == FLOW_ACTION_SAMPLE) {
 		if (flower_prio_valid &&
 		    mall_entry->priority >= flower_min_prio) {
 			NL_SET_ERR_MSG(f->common.extack, "Failed to add behind existing flower rules");