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74 lines
2.7 KiB
Diff
74 lines
2.7 KiB
Diff
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From a4abd7a80addb4a9547f7dfc7812566b60ec505c Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Bj=C3=B8rn=20Mork?= <bjorn@mork.no>
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Date: Wed, 6 Dec 2017 20:21:24 +0100
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Subject: [PATCH] usbnet: fix alignment for frames with no ethernet header
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The qmi_wwan minidriver support a 'raw-ip' mode where frames are
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received without any ethernet header. This causes alignment issues
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because the skbs allocated by usbnet are "IP aligned".
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Fix by allowing minidrivers to disable the additional alignment
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offset. This is implemented using a per-device flag, since the same
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minidriver also supports 'ethernet' mode.
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Fixes: 32f7adf633b9 ("net: qmi_wwan: support "raw IP" mode")
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Reported-and-tested-by: Jay Foster <jay@systech.com>
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Signed-off-by: Bjørn Mork <bjorn@mork.no>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/usb/qmi_wwan.c | 2 ++
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drivers/net/usb/usbnet.c | 5 ++++-
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include/linux/usb/usbnet.h | 1 +
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3 files changed, 7 insertions(+), 1 deletion(-)
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diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
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index c750cf7c042b..304ec6555cd8 100644
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--- a/drivers/net/usb/qmi_wwan.c
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+++ b/drivers/net/usb/qmi_wwan.c
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@@ -261,9 +261,11 @@ static void qmi_wwan_netdev_setup(struct net_device *net)
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net->hard_header_len = 0;
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net->addr_len = 0;
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net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
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+ set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
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netdev_dbg(net, "mode: raw IP\n");
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} else if (!net->header_ops) { /* don't bother if already set */
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ether_setup(net);
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+ clear_bit(EVENT_NO_IP_ALIGN, &dev->flags);
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netdev_dbg(net, "mode: Ethernet\n");
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}
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diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
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index 80348b6a8646..d56fe32bf48d 100644
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--- a/drivers/net/usb/usbnet.c
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+++ b/drivers/net/usb/usbnet.c
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@@ -484,7 +484,10 @@ static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
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return -ENOLINK;
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}
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- skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
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+ if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags))
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+ skb = __netdev_alloc_skb(dev->net, size, flags);
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+ else
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+ skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
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if (!skb) {
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netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
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usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
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diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
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index a69877734c4e..e2ec3582e549 100644
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--- a/include/linux/usb/usbnet.h
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+++ b/include/linux/usb/usbnet.h
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@@ -82,6 +82,7 @@ struct usbnet {
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# define EVENT_RX_KILL 10
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# define EVENT_LINK_CHANGE 11
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# define EVENT_SET_RX_MODE 12
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+# define EVENT_NO_IP_ALIGN 13
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};
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static inline struct usb_driver *driver_of(struct usb_interface *intf)
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--
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2.7.4
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