octeontx2-pf: flower: check for unsupported control flags

Use flow_rule_is_supp_control_flags() to reject filters with
unsupported control flags.

In case any unsupported control flags are masked,
flow_rule_is_supp_control_flags() sets a NL extended
error message, and we return -EOPNOTSUPP.

Remove FLOW_DIS_FIRST_FRAG specific error message,
and treat it as any other unsupported control flag.

Only compile-tested.
Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Sunil Goutham <sgoutham@marvell.com>
Link: https://lore.kernel.org/r/20240422152735.175693-1-ast@fiberby.netSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c

@@ -700,10 +700,6 @@ static int otx2_tc_prepare_flow(struct otx2_nic *nic, struct otx2_tc_flow *node,
 		u32 val;
 
 		flow_rule_match_control(rule, &match);
-		if (match.mask->flags & FLOW_DIS_FIRST_FRAG) {
-			NL_SET_ERR_MSG_MOD(extack, "HW doesn't support frag first/later");
-			return -EOPNOTSUPP;
-		}
 
 		if (match.mask->flags & FLOW_DIS_IS_FRAGMENT) {
 			val = match.key->flags & FLOW_DIS_IS_FRAGMENT;
@@ -721,6 +717,10 @@ static int otx2_tc_prepare_flow(struct otx2_nic *nic, struct otx2_tc_flow *node,
 				return -EOPNOTSUPP;
 			}
 		}
+
+		if (!flow_rule_is_supp_control_flags(FLOW_DIS_IS_FRAGMENT,
+						     match.mask->flags, extack))
+			return -EOPNOTSUPP;
 	}
 
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {