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, 5 insertions, 1 deletions

diff --git a/VNFs/DPPD-PROX/prox_port_cfg.h b/VNFs/DPPD-PROX/prox_port_cfg.h
index 9a252c16..d6090a35 100644
--- a/VNFs/DPPD-PROX/prox_port_cfg.h
+++ b/VNFs/DPPD-PROX/prox_port_cfg.h
@@ -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.
@@ -56,6 +56,7 @@ struct prox_port_cfg {
 	enum addr_type    type;
 	prox_rte_ether_addr eth_addr;    /* port MAC address */
 	char name[MAX_NAME_SIZE];
+	char vdev[MAX_NAME_SIZE];
 	char short_name[MAX_NAME_SIZE];
 	char driver_name[MAX_NAME_SIZE];
 	char rx_ring[MAX_NAME_SIZE];
@@ -79,6 +80,9 @@ struct prox_port_cfg {
 	uint16_t max_tx_desc;
 	uint32_t nb_mc_addr;
 	prox_rte_ether_addr mc_addr[NB_MCAST_ADDR];
+	int dpdk_mapping;
+	uint32_t ip;
+	int fd;
 };
 
 extern rte_atomic32_t lsc;