Merge pull request #245 from wilmo119/veth_sim

Add veth_sim platform.

platforms/veth_sim.py

@@ -0,0 +1,62 @@
+"""
+Platform configuration file
+platform == veth_sim
+"""
+
+###############################################################################
+#
+###############################################################################
+
+import os
+import sys
+import argparse
+import yaml
+
+if not "--platform-args" in " ".join(sys.argv):
+    raise Exception("--platform-args must be specified")
+
+ap = argparse.ArgumentParser("veth_sim")
+ap.add_argument("--platform-args")
+(ops, rest) = ap.parse_known_args()
+
+"""
+sample veth-cfgfile:
+eth1: eth1_oft
+eth2: eth2_oft
+eth3: eth3_oft
+
+sample ifname2ofport-cfgfile:
+eth1: 1
+eth2: 2
+eth3: 3
+"""
+
+args = ops.platform_args.split(",")
+# first arg: veth mapping cfg file
+# second arg: ifname to ofport number mapping cfg file
+if len(args) != 2:
+    raise Exception("Expecting <veth-cfgfile>,<ifname2ofport-cfgfile>")
+vethcfgfile = args[0]
+if2numcfgfile = args[1]
+
+vethcfg = {}
+if os.path.isfile(vethcfgfile):
+    print(vethcfgfile)
+    with open(vethcfgfile) as f:
+        vethcfg = yaml.load(f)
+
+if2numcfg = {}
+if os.path.isfile(if2numcfgfile):
+    print(if2numcfgfile)
+    with open(if2numcfgfile) as f:
+        if2numcfg = yaml.load(f)
+
+port_map = { int(v) : vethcfg[k]
+             for k, v in if2numcfg.items() if k in vethcfg}
+
+print "Veth-sim port mapping"
+print port_map
+
+def platform_config_update(config):
+    global port_map
+    config["port_map"] = port_map.copy()