| Message ID | 20171206192124.21670-1-bjorn@mork.no |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
| Series | usbnet: fix alignment for frames with no ethernet header | expand |
From: Bjørn Mork <bjorn@mork.no> Date: Wed, 6 Dec 2017 20:21:24 +0100 > 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: 32f7adf633b9 ("net: qmi_wwan: support "raw IP" mode") > Reported-and-tested-by: Jay Foster <jay@systech.com> > Signed-off-by: Bjørn Mork <bjorn@mork.no> Looks good, applied and queued up for -stable.
David Miller <davem@davemloft.net> writes: > From: Bjørn Mork <bjorn@mork.no> > Date: Wed, 6 Dec 2017 20:21:24 +0100 > >> 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: 32f7adf633b9 ("net: qmi_wwan: support "raw IP" mode") >> Reported-and-tested-by: Jay Foster <jay@systech.com> >> Signed-off-by: Bjørn Mork <bjorn@mork.no> > > Looks good, applied and queued up for -stable. Thanks. I can see it in the -stable queue, but it didn't show up here yet: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git Did it get stuck somewhere? Bjørn
From: Bjørn Mork <bjorn@mork.no> Date: Thu, 07 Dec 2017 20:01:16 +0100 > David Miller <davem@davemloft.net> writes: > >> From: Bjørn Mork <bjorn@mork.no> >> Date: Wed, 6 Dec 2017 20:21:24 +0100 >> >>> 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: 32f7adf633b9 ("net: qmi_wwan: support "raw IP" mode") >>> Reported-and-tested-by: Jay Foster <jay@systech.com> >>> Signed-off-by: Bjørn Mork <bjorn@mork.no> >> >> Looks good, applied and queued up for -stable. > > > Thanks. I can see it in the -stable queue, but it didn't show up here > yet: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git > > Did it get stuck somewhere? Caught again :-) I do GIT work on two different machines (one at home and one at the office) and sometimes I head to the office before pushing everything out on the machine at home :-/ I've pushed this specific patch out to 'net'.
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c index c750cf7c042b..304ec6555cd8 100644 --- a/drivers/net/usb/qmi_wwan.c +++ b/drivers/net/usb/qmi_wwan.c @@ -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"); } diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 80348b6a8646..d56fe32bf48d 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -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); diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h index a69877734c4e..e2ec3582e549 100644 --- a/include/linux/usb/usbnet.h +++ b/include/linux/usb/usbnet.h @@ -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)
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: 32f7adf633b9 ("net: qmi_wwan: support "raw IP" mode") Reported-and-tested-by: Jay Foster <jay@systech.com> Signed-off-by: Bjørn Mork <bjorn@mork.no> --- drivers/net/usb/qmi_wwan.c | 2 ++ drivers/net/usb/usbnet.c | 5 ++++- include/linux/usb/usbnet.h | 1 + 3 files changed, 7 insertions(+), 1 deletion(-)