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usbnet: fix alignment for frames with no ethernet header

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The qmi_wwan minidriver support a 'raw-ip' mode where frames are
received without any ethernet header. This causes alignment issues
because the skbs allocated by usbnet are "IP aligned".

Fix by allowing minidrivers to disable the additional alignment
offset. This is implemented using a per-device flag, since the same
minidriver also supports 'ethernet' mode.

Fixes: 32f7adf633 ("net: qmi_wwan: support "raw IP" mode")
Reported-and-tested-by: Jay Foster <jay@systech.com>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bjørn Mork 2017-12-06 20:21:24 +01:00 committed by David S. Miller
parent 8632385022
commit a4abd7a80a
3 changed files with 7 additions and 1 deletions
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2
drivers/net/usb/qmi_wwan.c
View File

@ -261,9 +261,11 @@ static void qmi_wwan_netdev_setup(struct net_device *net)
net->hard_header_len = 0;
net->addr_len = 0;
net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
netdev_dbg(net, "mode: raw IP\n");
} else if (!net->header_ops) { /* don't bother if already set */
ether_setup(net);
clear_bit(EVENT_NO_IP_ALIGN, &dev->flags);
netdev_dbg(net, "mode: Ethernet\n");
}

5
drivers/net/usb/usbnet.c
View File

@ -484,7 +484,10 @@ static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
return -ENOLINK;
}
skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags))
skb = __netdev_alloc_skb(dev->net, size, flags);
else
skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
if (!skb) {
netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
usbnet_defer_kevent (dev, EVENT_RX_MEMORY);

1
include/linux/usb/usbnet.h
View File

@ -82,6 +82,7 @@ struct usbnet {
# define EVENT_RX_KILL 10
# define EVENT_LINK_CHANGE 11
# define EVENT_SET_RX_MODE 12
# define EVENT_NO_IP_ALIGN 13
};
static inline struct usb_driver *driver_of(struct usb_interface *intf)