usbnet: add new flag FLAG_NOARP for usb net devices

We do have some USB net devices, which cannot do ARP.
so we can introduce a new flag FLAG_NOARP, then client drivers
can easily handle this kind of devices

Signed-off-by: Wei Shuai <cpuwolf@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 3d4bf01641b49f0f7c5d820a547885806378c4e2..f34b2ebee815ff6b832ef280e26ce7039ef6bfd6 100644 (file)
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1448,6 +1448,10 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
                if ((dev->driver_info->flags & FLAG_WWAN) != 0)
                        strcpy(net->name, "wwan%d");
 
+               /* devices that cannot do ARP */
+               if ((dev->driver_info->flags & FLAG_NOARP) != 0)
+                       net->flags |= IFF_NOARP;
+
                /* maybe the remote can't receive an Ethernet MTU */
                if (net->mtu > (dev->hard_mtu - net->hard_header_len))
                        net->mtu = dev->hard_mtu - net->hard_header_len;

diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index bd45eb7bedc8f365ab70704c552e93041af4ac94..5de7a220e98680f9c9cfc7b36c1f5c2114d7144f 100644 (file)
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -100,6 +100,7 @@ struct driver_info {
 #define FLAG_LINK_INTR 0x0800          /* updates link (carrier) status */
 
 #define FLAG_POINTTOPOINT 0x1000       /* possibly use "usb%d" names */
+#define FLAG_NOARP     0x2000          /* device can't do ARP */
 
 /*
  * Indicates to usbnet, that USB driver accumulates multiple IP packets.