[Xen-devel] [PATCH] add module_param to loopback.c to create more than one interface

[Patrick O'Rourke <porourke@xxxxxxxxxxx>]

It was suggested on the xen-users list that it would be useful if the 
loopback driver could instantiate an arbitrary number of interfaces, so 
the attached patch does that.
Pat

--
Patrick O'Rourke
porourke@xxxxxxxxxxx

diff -u --new-file --recursive 
a/xen-unstable/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c 
b/xen-unstable/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c
--- a/xen-unstable/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c  
2005-09-07 23:58:53.000000000 -0400
+++ b/xen-unstable/linux-2.6-xen-sparse/drivers/xen/netback/loopback.c  
2005-09-08 13:26:39.000000000 -0400
@@ -29,6 +29,11 @@
 #include <linux/skbuff.h>
 #include <net/dst.h>
 
+static int nloopbacks = 1;
+module_param(nloopbacks, int, 0);
+MODULE_PARM_DESC(nloopbacks, "number of devices to create");
+static int make_loopback(int);
+
 struct net_private {
     struct net_device *loopback_dev;
     struct net_device_stats stats;
@@ -120,11 +125,24 @@
 
 static int __init loopback_init(void)
 {
+       int i = 0;
+       int err;
+       do {
+               err = make_loopback(i);
+       } while (!err && (++i < nloopbacks));
+       return err;
+}
+
+static int __init make_loopback(int i)
+{
     struct net_device *dev1, *dev2;
+    char  dev_name[10];
     int err = -ENOMEM;
 
-    dev1 = alloc_netdev(sizeof(struct net_private), "vif0.0", ether_setup);
-    dev2 = alloc_netdev(sizeof(struct net_private), "veth0", ether_setup);
+    sprintf(dev_name, "vif0.%d", i);
+    dev1 = alloc_netdev(sizeof(struct net_private), dev_name, ether_setup);
+    sprintf(dev_name, "veth%d", i);
+    dev2 = alloc_netdev(sizeof(struct net_private), dev_name, ether_setup);
     if ( (dev1 == NULL) || (dev2 == NULL) )
         goto fail;
 

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