From patchwork Sat Jan 19 11:47:56 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [1/2] introduce flag FLAG_NOARP for usb net devices which cannot do ARP From: Wei Shuai X-Patchwork-Id: 213829 X-Patchwork-Delegate: davem@davemloft.net Message-Id: <1358596079-7126-1-git-send-email-cpuwolf@gmail.com> To: dbbw@redhat.com, davem@davemloft.net, peter@stuge.se, oneukum@suse.de, sshtylyov@mvista.com, gregkh@linuxfoundation.org, alexey.orishko@stericsson.com, bjorn@mork.no Cc: linux-usb@vger.kernel.org, netdev@vger.kernel.org, Wei Shuai Date: Sat, 19 Jan 2013 19:47:56 +0800 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 these kind of devices Signed-off-by: Wei Shuai --- drivers/net/usb/usbnet.c | 4 ++++ include/linux/usb/usbnet.h | 1 + 2 files changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 3d4bf01..f34b2eb 100644 --- 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 bd45eb7..5de7a22 100644 --- 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.