Re: mac80211_hwsim driver attribute

[Johannes Berg <johannes@sipsolutions.net>]

On Wed, 2013-04-03 at 13:38 +0000, Martin Pitt wrote:
> Hello John, hello Johannes,
> 
> first, many thanks for this great mac80211_hwsim module! I am
> currently working on automatic test cases for the Linux network stack
> (wpa_supplicant, dhclient, NetworkManager, etc.), and this is of great
> help.
> 
> One issue is that NetworkManager does not get along with these
> simulated interfaces:
> 
> NetworkManager[24027]: <warn> /sys/devices/virtual/mac80211_hwsim/hwsim0/net/wlan1: couldn't determine device driver; ignoring...
> 
> It calls udev_device_get_driver() on the net device (wlan0) (and
> failing that, on its parent), but that fails because hwsim doesn't
> have a driver attribute. My real intel wifi does:
> 
> lrwxrwxrwx 1 root root 0 Apr  3 06:19 /sys/class/net/wlan0/device/driver -> ../../../../bus/pci/drivers/iwlwifi
> 
> But /sys/class/net/wlan1/device/ only has the default "uevent" and
> subsystem link.
> 
> Other drivers call something like pci_register_driver() or
> usb_register(), I figure those will register the driver symlink in
> sysfs? But admittedly I'm a kernel n00b, so I'd appreciate a hint
> where to look for.
> 
> Thank you in advance!
> 
> Martin