diff options
Diffstat (limited to 'target/linux/generic/patches-4.4/099-0004-usbnet-fix-alignment-for-frames-with-no-ethernet-hea.patch')
| -rw-r--r-- | target/linux/generic/patches-4.4/099-0004-usbnet-fix-alignment-for-frames-with-no-ethernet-hea.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/099-0004-usbnet-fix-alignment-for-frames-with-no-ethernet-hea.patch b/target/linux/generic/patches-4.4/099-0004-usbnet-fix-alignment-for-frames-with-no-ethernet-hea.patch new file mode 100644 index 0000000..2511e0a --- /dev/null +++ b/target/linux/generic/patches-4.4/099-0004-usbnet-fix-alignment-for-frames-with-no-ethernet-hea.patch @@ -0,0 +1,73 @@ +From a4abd7a80addb4a9547f7dfc7812566b60ec505c Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Bj=C3=B8rn=20Mork?= <bjorn@mork.no> +Date: Wed, 6 Dec 2017 20:21:24 +0100 +Subject: [PATCH] usbnet: fix alignment for frames with no ethernet header +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +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> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + 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(-) + +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) +-- +2.7.4 + |