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, 7 insertions, 1 deletions

diff --git a/VNFs/DPPD-PROX/handle_master.h b/VNFs/DPPD-PROX/handle_master.h
index bc32182d..7772dd32 100644
--- a/VNFs/DPPD-PROX/handle_master.h
+++ b/VNFs/DPPD-PROX/handle_master.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.
@@ -23,6 +23,7 @@ enum arp_actions {
 	ARP_REPLY_FROM_CTRL,
 	ARP_TO_CTRL,
 	REQ_MAC_TO_CTRL,
+	PKT_FROM_TAP,
 	MAX_ACTIONS
 };
 
@@ -40,4 +41,9 @@ static inline void tx_drop(struct rte_mbuf *mbuf)
 	rte_pktmbuf_free(mbuf);
 }
 
+struct vdev {
+	int port_id;
+	struct rte_ring *ring;
+};
 void register_ip_to_ctrl_plane(struct task_base *task, uint32_t ip, uint8_t port_id, uint8_t core_id, uint8_t task_id);
+void master_init_vdev(struct task_base *task, uint8_t port_id, uint8_t core_id, uint8_t task_id);