Add support for vdev tap devices

This commit adds support for the creation of tap devices.
To create a tap device, and associate it with a DPDK port,
add within the port section:
vdev=<tap_name>
local ipv4=<ip_assigned_to_port>
<tap_name> will appear as a kernel network device, with an IP <ip_assigned_to_port>

ARP packets received from the network on the DPDK interface will be forwarded to the kernel.
1st packet which needs to be generated to a new IP will cause an IP packet
to be sent to the kernel (using socket sendto) forcing the kernel to send an ARP_REQUEST.

In this commit, there is no notification from the kernel about ARP table changes.
This is subject to further commits.

Two config files, gen_tap.cfg and swap_tap.cfg have been created. They work one against each other.
*** Note however that they do not work if running within the same host
(with the port being connected back to back) ***
This is due to the fact that the kernel would bypass the ports and use local interface...

Change-Id: Iadeec0d99e3c693472ea44bdb9163a3bf97df2fa
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/VNFs/DPPD-PROX/defaults.c b/VNFs/DPPD-PROX/defaults.c
index b839453d..bb359cfb 100644
--- a/VNFs/DPPD-PROX/defaults.c
+++ b/VNFs/DPPD-PROX/defaults.c
@@ -1,5 +1,5 @@
 /*
-// Copyright (c) 2010-2017 Intel Corporation
+// Copyright (c) 2010-2020 Intel Corporation
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -194,6 +194,7 @@ void set_port_defaults(void)
 		prox_port_cfg[i].rx_ring[0] = '\0';
 		prox_port_cfg[i].tx_ring[0] = '\0';
 		prox_port_cfg[i].mtu = PROX_MTU;
+		prox_port_cfg[i].dpdk_mapping = NO_VDEV_PORT;
 
 		// CRC_STRIP becoming the default behavior in DPDK 18.08, and
 		// DEV_RX_OFFLOAD_CRC_STRIP define has been deleted