+++ /dev/null
-From linux-netdev Tue Dec 03 13:04:55 2024
-From: Dominique Martinet <asmadeus () codewreck ! org>
-Date: Tue, 03 Dec 2024 13:04:55 +0000
-To: linux-netdev
-Subject: [PATCH] net: usb: usbnet: restore usb%d name exception for local mac addresses
-Message-Id: <20241203130457.904325-1-asmadeus () codewreck ! org>
-X-MARC-Message: https://marc.info/?l=linux-netdev&m=173323431631309
-
-From: Dominique Martinet <dominique.martinet@atmark-techno.com>
-
-The previous commit assumed that local addresses always came from the
-kernel, but some devices hand out local mac addresses so we ended up
-with point-to-point devices with a mac set by the driver, renaming to
-eth%d when they used to be named usb%d.
-
-Userspace should not rely on device name, but for the sake of stability
-restore the local mac address check portion of the naming exception:
-point to point devices which either have no mac set by the driver or
-have a local mac handed out by the driver will keep the usb%d name.
-
-Fixes: 8a7d12d674ac ("net: usb: usbnet: fix name regression")
-Signed-off-by: Dominique Martinet <dominique.martinet@atmark-techno.com>
----
- drivers/net/usb/usbnet.c | 20 ++++++++++++++------
- 1 file changed, 14 insertions(+), 6 deletions(-)
-
---- a/drivers/net/usb/usbnet.c
-+++ b/drivers/net/usb/usbnet.c
-@@ -178,6 +178,17 @@ int usbnet_get_ethernet_addr(struct usbn
- }
- EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
-
-+static bool usbnet_needs_usb_name_format(struct usbnet *dev, struct net_device *net)
-+{
-+ /* Point to point devices which don't have a real MAC address
-+ * (or report a fake local one) have historically used the usb%d
-+ * naming. Preserve this..
-+ */
-+ return (dev->driver_info->flags & FLAG_POINTTOPOINT) != 0 &&
-+ (is_zero_ether_addr(net->dev_addr) ||
-+ is_local_ether_addr(net->dev_addr));
-+}
-+
- static void intr_complete (struct urb *urb)
- {
- struct usbnet *dev = urb->context;
-@@ -1766,13 +1777,10 @@ usbnet_probe (struct usb_interface *udev
- if (status < 0)
- goto out1;
-
-- // heuristic: "usb%d" for links we know are two-host,
-- // else "eth%d" when there's reasonable doubt. userspace
-- // can rename the link if it knows better.
-+ /* heuristic: rename to "eth%d" if we are not sure this link
-+ * is two-host (these links keep "usb%d") */
- if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
-- ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
-- /* somebody touched it*/
-- !is_zero_ether_addr(net->dev_addr)))
-+ !usbnet_needs_usb_name_format(dev, net))
- strscpy(net->name, "eth%d", sizeof(net->name));
- /* WLAN devices should always be named "wlan%d" */
- if ((dev->driver_info->flags & FLAG_WLAN) != 0)