On Thu, Feb 27, 2014 at 3:47 PM, David Herrmann <dh.herrmann@xxxxxxxxx> wrote: > This series implements a new sysfs attribute for netdevs called > "name_assign_type". It provides an integer that describes where an interface > name comes from. See Patch #1 for a description of this attribute. It is > modelled after the existing "addr_assign_type" attribute. > > The main use-case is to allow udev to skip applying reliable ifnames to virtual > devices. For instance, if wifi-P2P devices are created, wpas already provides a > suitable naming-policy and udev shouldn't touch these devices. Same is true for > other virtual devices. > The idea is that if a device-name was provided by user-space, we should always > prefer fixing this naming-policy instead of making udev rename the device. For > kernel provided names that's hardly possible, though. Providing the > naming-policy source via sysfs is thus a simple way to see whether renames are > needed. > > Additionally, this field allows to detect whether a netdev has been manually > renamed, which is quite useful for debugging and during crash-recovery. Moreover, it would be useful for udev to reliably know if some other userspace process already renamed a device, so we know not to touch it. This can easily happen for instance if some renaming happens in the initrd or from script called from udev rules. Acked-by: Tom Gundersen <teg@xxxxxxx> > David Herrmann (4): > net: add name_assign_type netdev attribute > mac80211: set NET_NAME_USER for user-space created ifs > ath6kl: set NET_NAME_USER for P2P ifs > brcmfmac: set NET_NAME_USER for P2P ifs > > drivers/net/wireless/ath/ath6kl/cfg80211.c | 5 ++++- > drivers/net/wireless/ath/ath6kl/cfg80211.h | 1 + > drivers/net/wireless/ath/ath6kl/core.c | 4 ++-- > drivers/net/wireless/brcm80211/brcmfmac/p2p.c | 1 + > include/linux/netdevice.h | 6 ++++++ > net/core/dev.c | 7 +++++++ > net/core/net-sysfs.c | 2 ++ > net/core/rtnetlink.c | 2 ++ > net/mac80211/iface.c | 1 + > 9 files changed, 26 insertions(+), 3 deletions(-) > > -- > 1.9.0 > -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
