diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 7e725fa60347..faa8ba012a37 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -368,15 +368,12 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 			break;
 
 		default:
-			/* Other ethtype - we need check the masks for the
-			 * remainder of the key to ensure we can offload.
-			 */
-			if (nfp_flower_check_higher_than_mac(flow)) {
-				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: non IPv4/IPv6 offload with L3/L4 matches not supported");
-				return -EOPNOTSUPP;
-			}
-			break;
+			NL_SET_ERR_MSG_MOD(extack, "unsupported offload: match on given EtherType is not supported");
+			return -EOPNOTSUPP;
 		}
+	} else if (nfp_flower_check_higher_than_mac(flow)) {
+		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match above L2 without specified EtherType");
+		return -EOPNOTSUPP;
 	}
 
 	if (basic.mask && basic.mask->ip_proto) {
@@ -389,18 +386,15 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 			key_layer |= NFP_FLOWER_LAYER_TP;
 			key_size += sizeof(struct nfp_flower_tp_ports);
 			break;
-		default:
-			/* Other ip proto - we need check the masks for the
-			 * remainder of the key to ensure we can offload.
-			 */
-			if (nfp_flower_check_higher_than_l3(flow)) {
-				NL_SET_ERR_MSG_MOD(extack, "unsupported offload: unknown IP protocol with L4 matches not supported");
-				return -EOPNOTSUPP;
-			}
-			break;
 		}
 	}
 
+	if (!(key_layer & NFP_FLOWER_LAYER_TP) &&
+	    nfp_flower_check_higher_than_l3(flow)) {
+		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: cannot match on L4 information without specified IP protocol type");
+		return -EOPNOTSUPP;
+	}
+
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP)) {
 		struct flow_match_tcp tcp;
 		u32 tcp_flags;