NFVBENCH-157 Add possibility to not use the ARP static configuration for VPP loop VM

Change-Id: Ifd3f183345e21c7866e9e9898c7bbda601793b2c
Signed-off-by: fmenguy <francoisregis.menguy@orange.com>

4 files changed, 19 insertions, 3 deletions

diff --git a/nfvbench/cfg.default.yaml b/nfvbench/cfg.default.yaml
index d3a3fb9..2abc8dc 100755
--- a/nfvbench/cfg.default.yaml
+++ b/nfvbench/cfg.default.yaml
@@ -610,6 +610,11 @@ vlans: []
 #       (see mac_addrs_left and mac_addrs_right)
 no_arp: false
 
+# Loop VM (VPP forwarder) can use ARP to discover next hop mac address
+# False (default): do not send ARP but use static config devices macs instead (TRex gratuitous ARP are not interpreted by VPP)
+# True: ARP requests are sent to find out next hop MAC addresses (for instance SDN-GW)
+loop_vm_arp: false
+
 # Traffic Profiles
 # You can add here more profiles as needed
 # `l2frame_size` can be specified in any none zero integer value to represent the size in bytes
diff --git a/nfvbench/chain_runner.py b/nfvbench/chain_runner.py
index 418d667..bb35426 100644
--- a/nfvbench/chain_runner.py
+++ b/nfvbench/chain_runner.py
@@ -105,7 +105,8 @@ class ChainRunner(object):
         if not self.config.no_traffic:
             # ARP is needed for EXT chain or VxLAN overlay unless disabled explicitly
             if (self.config.service_chain == ChainType.EXT or
-                    self.config.vxlan or self.config.l3_router) and not self.config.no_arp:
+                    self.config.vxlan or self.config.l3_router or self.config.loop_vm_arp)\
+                    and not self.config.no_arp:
                 self.traffic_client.ensure_arp_successful()
             self.traffic_client.ensure_end_to_end()
 
diff --git a/nfvbench/chaining.py b/nfvbench/chaining.py
index a8d6295..71693be 100644
--- a/nfvbench/chaining.py
+++ b/nfvbench/chaining.py
@@ -456,8 +456,12 @@ class ChainVnf(object):
         else:
             tg_gateway1_ip = devices[LEFT].tg_gateway_ip_addrs
             tg_gateway2_ip = devices[RIGHT].tg_gateway_ip_addrs
-            tg_mac1 = remote_mac_pair[0]
-            tg_mac2 = remote_mac_pair[1]
+            if not config.loop_vm_arp:
+                tg_mac1 = remote_mac_pair[0]
+                tg_mac2 = remote_mac_pair[1]
+            else:
+                tg_mac1 = ""
+                tg_mac2 = ""
 
             g1cidr = devices[LEFT].get_gw_ip(
                 self.chain.chain_id) + self.__get_network_mask(
diff --git a/nfvbench/nfvbench.py b/nfvbench/nfvbench.py
index eb86dea..168c545 100644
--- a/nfvbench/nfvbench.py
+++ b/nfvbench/nfvbench.py
@@ -343,6 +343,12 @@ def _parse_opts_from_cli():
                         help='Do not use ARP to find MAC addresses, '
                              'instead use values in config file')
 
+    parser.add_argument('--loop-vm-arp', dest='loop_vm_arp',
+                        default=None,
+                        action='store_true',
+                        help='Use ARP to find MAC addresses '
+                             'instead of using values from TRex ports (VPP forwarder only)')
+
     parser.add_argument('--no-vswitch-access', dest='no_vswitch_access',
                         default=None,
                         action='store_true',