net/enic: avoid error message when no advanced filtering

[ upstream commit af397b3 ]

Probing the availability of Flow Manager API may print the following
error log.

PMD: rte_enic_pmd: Devcmd 88 failed with error code -1

The error indicates a flow manager operation failed and happens when
advanced filtering is disabled on vNIC. It is harmless but confusing
to the user. Since advanced filtering is a prerequisite, check first
if it is available and avoid the error message altogether.

Fixes: ea7768b ("net/enic: add flow implementation based on Flow Manager API")

Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>

drivers/net/enic/base/vnic_dev.c

@@ -520,6 +520,9 @@ static int vnic_dev_flowman_enable(struct vnic_dev *vdev, u32 *mode,
 	u64 ops;
 	static u32 instance;
 
+	/* Advanced filtering is a prerequisite */
+	if (!vnic_dev_capable_adv_filters(vdev))
+		return 0;
 	/* flowman devcmd available? */
 	if (!vnic_dev_capable(vdev, CMD_FLOW_MANAGER_OP))
 		return 0;