To have the support corresponding kernel module (UNCI) needs to be
inserted.  If kernel module is not there, application will run as
it is without kernel control path support.

When UNCI module inserted, running application creates a virtual Linux
network interface (dpdk$) per DPDK port. This interface can be used by
traditional Linux tools.

If Userspace Network Control Interface (UNCI) kernel module
(rte_unci.ko) inserted, virtual interfaces created for each DPDK port
for control purposes.

Created interfaces are named as dpdk#, like:

    $ ifconfig dpdk0; ifconfig dpdk1
    dpdk0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
            ether 90:e2:ba:0e:49:b9  txqueuelen 1000  (Ethernet)
            RX packets 0  bytes 0 (0.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 0  bytes 0 (0.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

    dpdk1: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
            ether 00:1b:21:76:fa:21  txqueuelen 1000  (Ethernet)
            RX packets 0  bytes 0 (0.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 0  bytes 0 (0.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Regular Linux commands can be issued on interfaces:

	$ ethtool -i dpdk0
	driver: net_ixgbe
	version: DPDK 17.08.0-rc0
	firmware-version: 0x61bf0001
	expansion-rom-version:
	bus-info: 0000:08:00.1
	supports-statistics: no
	supports-test: no
	supports-eeprom-access: yes
	supports-register-dump: yes
	supports-priv-flags: no

Signed-off-by: Ferruh Yigit <redacted>
---
 lib/librte_ether/rte_ethdev_pci.h | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/lib/librte_ether/rte_ethdev_pci.h b/lib/librte_ether/rte_ethdev_pci.h
index 69aab03fb..a32a617d7 100644
--- a/lib/librte_ether/rte_ethdev_pci.h
+++ b/lib/librte_ether/rte_ethdev_pci.h

@@ -38,6 +38,13 @@
 #include <rte_pci.h>
 #include <rte_ethdev.h>
 
+#ifdef RTE_LIBRTE_CTRL_IF
+#include <rte_ctrl_if.h>
+#else
+#define rte_eth_control_interface_create_one(port_id) do { } while(0)
+#define rte_eth_control_interface_destroy_one(port_id) do { } while(0)
+#endif
+
 /**
  * Copy pci device info to the Ethernet device data.
  *

@@ -157,8 +164,12 @@ rte_eth_dev_pci_generic_probe(struct rte_pci_device *pci_dev,
 
 	RTE_FUNC_PTR_OR_ERR_RET(*dev_init, -EINVAL);
 	ret = dev_init(eth_dev);
-	if (ret)
+	if (ret) {
 		rte_eth_dev_pci_release(eth_dev);
+		return ret;
+	}
+
+	rte_eth_control_interface_create_one(eth_dev->data->port_id);
 
 	return ret;
 }

@@ -179,6 +190,8 @@ rte_eth_dev_pci_generic_remove(struct rte_pci_device *pci_dev,
 	if (!eth_dev)
 		return -ENODEV;
 
+	rte_eth_control_interface_destroy_one(eth_dev->data->port_id);
+
 	if (dev_uninit) {
 		ret = dev_uninit(eth_dev);
 		if (ret)

-- 
2.13.0