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From:   Georgi Valkov <gvalkov@abv.bg>
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        boundary="Apple-Mail=_E1CEB9A7-9EC3-493B-A739-1B859D0B4C9F"
Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3696.120.41.1.3\))
Subject: net: usb: ipheth: add CDC NCM support
Message-Id: <0A1C2108-75F2-46B7-8712-616FE6464294@abv.bg>
Date:   Thu, 11 May 2023 12:47:56 +0300
Cc:     =?utf-8?B?0JPQtdC+0YDQs9C4INCT0LXQvtGA0LPQuNC10LIg0JLRitC70LrQvtCy?= 
        <gvalkov@abv.bg>
To:     Greg KH <gregkh@linuxfoundation.org>,
        Foster Snowhill <forst@pen.gy>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Jan Kiszka <jan.kiszka@siemens.com>,
        Jakub Kicinski <kuba@kernel.org>
Precedence: bulk


--Apple-Mail=_E1CEB9A7-9EC3-493B-A739-1B859D0B4C9F
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=utf-8

Can you please review, and accept the following patch. I=E2=80=99ve been =
using it for one year.
I added the author Foster Snowhill to this mail, as well as a link to =
his Github [1].
If needed, we can ask him to add the tag Signed-off-by:


=46rom 257d843a7f90e4e519635f82fe5b73fba918ec33 Mon Sep 17 00:00:00 2001
From: Foster Snowhill <Forst@users.noreply.github.com>
Date: Fri, 22 Apr 2022 23:50:09 +0200
Subject: [PATCH] net: usb: ipheth: add CDC NCM support (PoC)

Recent iOS releases support CDC NCM encapsulation on RX. This mode is
the default on macOS and Windows.

When reconnecting a device from a macOS/Windows machine to a Linux
machine, the device stays in NCM mode. Therefore to correctly support
such a device, the driver has to either support the NCM mode too, or
somehow put the device back into legacy mode.

To match the behaviour of the macOS/Windows driver, and since there
are no documented control commands to revert to legacy mode, I chose
to implement basic NCM support.

With this change, the device is attempted to be put into NCM mode by
default, and falls back to legacy mode if said attempt failed.

Tested-by: Georgi Valkov <gvalkov@abv.bg>


[1] =
https://github.com/Forst/linux-stable/commit/257d843a7f90e4e519635f82fe5b7=
3fba918ec33#diff-d13f85b8acc1204f31e7abc538e9fdb1faa07b94cd928800b6b976561=
d32f6e3

This can be applied directly to Linux master, as well as 5.10 and 5.15 =
stable.

--Apple-Mail=_E1CEB9A7-9EC3-493B-A739-1B859D0B4C9F
Content-Disposition: attachment;
	filename=0001-net-usb-ipheth-add-CDC-NCM-support-PoC.patch
Content-Type: application/octet-stream;
	x-unix-mode=0644;
	name="0001-net-usb-ipheth-add-CDC-NCM-support-PoC.patch"
Content-Transfer-Encoding: quoted-printable

=46rom=207d530b3969fb1a3eb34bcf83cbf1da86e9224a85=20Mon=20Sep=2017=20=
00:00:00=202001=0AFrom:=20Foster=20Snowhill=20=
<Forst@users.noreply.github.com>=0ADate:=20Fri,=2022=20Apr=202022=20=
23:50:09=20+0200=0ASubject:=20[PATCH]=20net:=20usb:=20ipheth:=20add=20=
CDC=20NCM=20support=20(PoC)=0A=0ARecent=20iOS=20releases=20support=20CDC=20=
NCM=20encapsulation=20on=20RX.=20This=20mode=20is=0Athe=20default=20on=20=
macOS=20and=20Windows.=0A=0AWhen=20reconnecting=20a=20device=20from=20a=20=
macOS/Windows=20machine=20to=20a=20Linux=0Amachine,=20the=20device=20=
stays=20in=20NCM=20mode.=20Therefore=20to=20correctly=20support=0Asuch=20=
a=20device,=20the=20driver=20has=20to=20either=20support=20the=20NCM=20=
mode=20too,=20or=0Asomehow=20put=20the=20device=20back=20into=20legacy=20=
mode.=0A=0ATo=20match=20the=20behaviour=20of=20the=20macOS/Windows=20=
driver,=20and=20since=20there=0Aare=20no=20documented=20control=20=
commands=20to=20revert=20to=20legacy=20mode,=20I=20chose=0Ato=20=
implement=20basic=20NCM=20support.=0A=0AWith=20this=20change,=20the=20=
device=20is=20attempted=20to=20be=20put=20into=20NCM=20mode=20by=0A=
default,=20and=20falls=20back=20to=20legacy=20mode=20if=20said=20attempt=20=
failed.=0A=0ATested-by:=20Georgi=20Valkov=20<gvalkov@abv.bg>=0A---=0A=20=
drivers/net/usb/ipheth.c=20|=20175=20=
+++++++++++++++++++++++++++++++--------=0A=201=20file=20changed,=20142=20=
insertions(+),=2033=20deletions(-)=0A=0Adiff=20--git=20=
a/drivers/net/usb/ipheth.c=20b/drivers/net/usb/ipheth.c=0Aindex=20=
6a769df0b421..4d05d8d6b5bc=20100644=0A---=20a/drivers/net/usb/ipheth.c=0A=
+++=20b/drivers/net/usb/ipheth.c=0A@@=20-52,6=20+52,7=20@@=0A=20#include=20=
<linux/ethtool.h>=0A=20#include=20<linux/usb.h>=0A=20#include=20=
<linux/workqueue.h>=0A+#include=20<linux/usb/cdc.h>=0A=20=0A=20#define=20=
USB_VENDOR_APPLE=20=20=20=20=20=20=20=200x05ac=0A=20=0A@@=20-59,8=20=
+60,11=20@@=0A=20#define=20IPHETH_USBINTF_SUBCLASS=20253=0A=20#define=20=
IPHETH_USBINTF_PROTO=20=20=20=201=0A=20=0A-#define=20IPHETH_BUF_SIZE=20=20=
=20=20=20=20=20=20=201514=0A=20#define=20IPHETH_IP_ALIGN=09=092=09/*=20=
padding=20at=20front=20of=20URB=20*/=0A+#define=20IPHETH_NCM_HEADER_SIZE=20=
=20(12=20+=2096)=20/*=20NCMH=20+=20NCM0=20*/=0A+#define=20=
IPHETH_TX_BUF_SIZE=20=20=20=20=20=20ETH_FRAME_LEN=0A+#define=20=
IPHETH_RX_BUF_SIZE=20=20=20=20=20=2065536=0A+=0A=20#define=20=
IPHETH_TX_TIMEOUT=20=20=20=20=20=20=20(5=20*=20HZ)=0A=20=0A=20#define=20=
IPHETH_INTFNUM=20=20=20=20=20=20=20=20=20=202=0A@@=20-71,6=20+75,7=20@@=0A=
=20#define=20IPHETH_CTRL_TIMEOUT=20=20=20=20=20(5=20*=20HZ)=0A=20=0A=20=
#define=20IPHETH_CMD_GET_MACADDR=20=20=200x00=0A+#define=20=
IPHETH_CMD_ENABLE_NCM=20=20=20=200x04=0A=20#define=20=
IPHETH_CMD_CARRIER_CHECK=200x45=0A=20=0A=20#define=20=
IPHETH_CARRIER_CHECK_TIMEOUT=20round_jiffies_relative(1=20*=20HZ)=0A@@=20=
-84,6=20+89,8=20@@=20static=20const=20struct=20usb_device_id=20=
ipheth_table[]=20=3D=20{=0A=20};=0A=20MODULE_DEVICE_TABLE(usb,=20=
ipheth_table);=0A=20=0A+static=20const=20char=20ipheth_start_packet[]=20=
=3D=20{=200x00,=200x01,=200x01,=200x00=20};=0A+=0A=20struct=20=
ipheth_device=20{=0A=20=09struct=20usb_device=20*udev;=0A=20=09struct=20=
usb_interface=20*intf;=0A@@=20-97,6=20+104,7=20@@=20struct=20=
ipheth_device=20{=0A=20=09u8=20bulk_out;=0A=20=09struct=20delayed_work=20=
carrier_work;=0A=20=09bool=20confirmed_pairing;=0A+=09int=20=
(*rcvbulk_callback)(struct=20urb=20*urb);=0A=20};=0A=20=0A=20static=20=
int=20ipheth_rx_submit(struct=20ipheth_device=20*dev,=20gfp_t=20=
mem_flags);=0A@@=20-116,12=20+124,12=20@@=20static=20int=20=
ipheth_alloc_urbs(struct=20ipheth_device=20*iphone)=0A=20=09if=20(rx_urb=20=
=3D=3D=20NULL)=0A=20=09=09goto=20free_tx_urb;=0A=20=0A-=09tx_buf=20=3D=20=
usb_alloc_coherent(iphone->udev,=20IPHETH_BUF_SIZE,=0A+=09tx_buf=20=3D=20=
usb_alloc_coherent(iphone->udev,=20IPHETH_TX_BUF_SIZE,=0A=20=09=09=09=09=20=
=20=20=20GFP_KERNEL,=20&tx_urb->transfer_dma);=0A=20=09if=20(tx_buf=20=3D=3D=
=20NULL)=0A=20=09=09goto=20free_rx_urb;=0A=20=0A-=09rx_buf=20=3D=20=
usb_alloc_coherent(iphone->udev,=20IPHETH_BUF_SIZE=20+=20=
IPHETH_IP_ALIGN,=0A+=09rx_buf=20=3D=20usb_alloc_coherent(iphone->udev,=20=
IPHETH_RX_BUF_SIZE,=0A=20=09=09=09=09=20=20=20=20GFP_KERNEL,=20=
&rx_urb->transfer_dma);=0A=20=09if=20(rx_buf=20=3D=3D=20NULL)=0A=20=09=09=
goto=20free_tx_buf;=0A@@=20-134,7=20+142,7=20@@=20static=20int=20=
ipheth_alloc_urbs(struct=20ipheth_device=20*iphone)=0A=20=09return=200;=0A=
=20=0A=20free_tx_buf:=0A-=09usb_free_coherent(iphone->udev,=20=
IPHETH_BUF_SIZE,=20tx_buf,=0A+=09usb_free_coherent(iphone->udev,=20=
IPHETH_TX_BUF_SIZE,=20tx_buf,=0A=20=09=09=09=20=20tx_urb->transfer_dma);=0A=
=20free_rx_urb:=0A=20=09usb_free_urb(rx_urb);=0A@@=20-146,9=20+154,9=20=
@@=20static=20int=20ipheth_alloc_urbs(struct=20ipheth_device=20*iphone)=0A=
=20=0A=20static=20void=20ipheth_free_urbs(struct=20ipheth_device=20=
*iphone)=0A=20{=0A-=09usb_free_coherent(iphone->udev,=20IPHETH_BUF_SIZE=20=
+=20IPHETH_IP_ALIGN,=20iphone->rx_buf,=0A+=09=
usb_free_coherent(iphone->udev,=20IPHETH_RX_BUF_SIZE,=20iphone->rx_buf,=0A=
=20=09=09=09=20=20iphone->rx_urb->transfer_dma);=0A-=09=
usb_free_coherent(iphone->udev,=20IPHETH_BUF_SIZE,=20iphone->tx_buf,=0A+=09=
usb_free_coherent(iphone->udev,=20IPHETH_TX_BUF_SIZE,=20iphone->tx_buf,=0A=
=20=09=09=09=20=20iphone->tx_urb->transfer_dma);=0A=20=09=
usb_free_urb(iphone->rx_urb);=0A=20=09usb_free_urb(iphone->tx_urb);=0A@@=20=
-160,14=20+168,96=20@@=20static=20void=20ipheth_kill_urbs(struct=20=
ipheth_device=20*dev)=0A=20=09usb_kill_urb(dev->rx_urb);=0A=20}=0A=20=0A=
-static=20void=20ipheth_rcvbulk_callback(struct=20urb=20*urb)=0A+static=20=
int=20ipheth_consume_skb(char*=20buf,=20int=20len,=20struct=20=
ipheth_device=20*dev)=0A=20{=0A-=09struct=20ipheth_device=20*dev;=0A=20=09=
struct=20sk_buff=20*skb;=0A-=09int=20status;=0A+=0A+=09skb=20=3D=20=
dev_alloc_skb(len);=0A+=09if=20(!skb)=20{=0A+=09=09=
dev->net->stats.rx_dropped++;=0A+=09=09return=20-ENOMEM;=0A+=09}=0A+=0A+=09=
skb_put_data(skb,=20buf,=20len);=0A+=09skb->dev=20=3D=20dev->net;=0A+=09=
skb->protocol=20=3D=20eth_type_trans(skb,=20dev->net);=0A+=0A+=09=
dev->net->stats.rx_packets++;=0A+=09dev->net->stats.rx_bytes=20+=3D=20=
len;=0A+=09netif_rx(skb);=0A+=0A+=09return=200;=0A+}=0A+=0A+static=20int=20=
ipheth_rcvbulk_callback_legacy(struct=20urb=20*urb)=0A+{=0A+=09struct=20=
ipheth_device=20*dev;=0A=20=09char=20*buf;=0A=20=09int=20len;=0A=20=0A+=09=
dev=20=3D=20urb->context;=0A+=0A+=09if=20(urb->actual_length=20<=3D=20=
IPHETH_IP_ALIGN)=20{=0A+=09=09dev->net->stats.rx_length_errors++;=0A+=09=09=
return=20-EINVAL;=0A+=09}=0A+=09len=20=3D=20urb->actual_length=20-=20=
IPHETH_IP_ALIGN;=0A+=09buf=20=3D=20urb->transfer_buffer=20+=20=
IPHETH_IP_ALIGN;=0A+=0A+=09return=20ipheth_consume_skb(buf,=20len,=20=
dev);=0A+}=0A+=0A+static=20int=20ipheth_rcvbulk_callback_ncm(struct=20=
urb=20*urb)=0A+{=0A+=09struct=20ipheth_device=20*dev;=0A+=09struct=20=
usb_cdc_ncm_nth16=20*ncmh;=0A+=09struct=20usb_cdc_ncm_ndp16=20*ncm0;=0A+=09=
struct=20usb_cdc_ncm_dpe16=20*dpe;=0A+=09char=20*buf;=0A+=09int=20len;=0A=
+=09int=20retval=20=3D=20-EINVAL;=0A+=0A+=09dev=20=3D=20urb->context;=0A=
+=0A+=09if=20(urb->actual_length=20<=20IPHETH_NCM_HEADER_SIZE)=20{=0A+=09=
=09dev->net->stats.rx_length_errors++;=0A+=09=09return=20retval;=0A+=09}=0A=
+=0A+=09ncmh=20=3D=20(struct=20usb_cdc_ncm_nth16=20=
*)(urb->transfer_buffer);=0A+=09if=20(ncmh->dwSignature=20!=3D=20=
cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)=20||=0A+=09=20=20=20=20=
le16_to_cpu(ncmh->wNdpIndex)=20>=3D=20urb->actual_length)=20{=0A+=09=09=
dev->net->stats.rx_errors++;=0A+=09=09return=20retval;=0A+=09}=0A+=0A+=09=
ncm0=20=3D=20(struct=20usb_cdc_ncm_ndp16=20*)(urb->transfer_buffer=20+=20=
le16_to_cpu(ncmh->wNdpIndex));=0A+=09if=20(ncm0->dwSignature=20!=3D=20=
cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)=20||=0A+=09=20=20=20=20=
le16_to_cpu(ncmh->wHeaderLength)=20+=20le16_to_cpu(ncm0->wLength)=20>=3D=20=
urb->actual_length)=20{=0A+=09=09dev->net->stats.rx_errors++;=0A+=09=09=
return=20retval;=0A+=09}=0A+=0A+=09dpe=20=3D=20ncm0->dpe16;=0A+=09while=20=
(le16_to_cpu(dpe->wDatagramIndex)=20!=3D=200=20&&=20=
le16_to_cpu(dpe->wDatagramLength)=20!=3D=200)=20{=0A+=09=09buf=20=3D=20=
urb->transfer_buffer=20+=20le16_to_cpu(dpe->wDatagramIndex);=0A+=09=09=
len=20=3D=20le16_to_cpu(dpe->wDatagramLength);=0A+=0A+=09=09retval=20=3D=20=
ipheth_consume_skb(buf,=20len,=20dev);=0A+=09=09if=20(retval=20!=3D=200)=0A=
+=09=09=09return=20retval;=0A+=0A+=09=09dpe++;=0A+=09}=0A+=0A+=09return=20=
0;=0A+}=0A+=0A+static=20void=20ipheth_rcvbulk_callback(struct=20urb=20=
*urb)=0A+{=0A+=09struct=20ipheth_device=20*dev;=0A+=09int=20retval,=20=
status;=0A+=0A=20=09dev=20=3D=20urb->context;=0A=20=09if=20(dev=20=3D=3D=20=
NULL)=0A=20=09=09return;=0A@@=20-187,29=20+277,24=20@@=20static=20void=20=
ipheth_rcvbulk_callback(struct=20urb=20*urb)=0A=20=09=09return;=0A=20=09=
}=0A=20=0A-=09if=20(urb->actual_length=20<=3D=20IPHETH_IP_ALIGN)=20{=0A-=09=
=09dev->net->stats.rx_length_errors++;=0A-=09=09return;=0A-=09}=0A-=09=
len=20=3D=20urb->actual_length=20-=20IPHETH_IP_ALIGN;=0A-=09buf=20=3D=20=
urb->transfer_buffer=20+=20IPHETH_IP_ALIGN;=0A-=0A-=09skb=20=3D=20=
dev_alloc_skb(len);=0A-=09if=20(!skb)=20{=0A-=09=09=
dev_err(&dev->intf->dev,=20"%s:=20dev_alloc_skb:=20-ENOMEM\n",=0A-=09=09=09=
__func__);=0A-=09=09dev->net->stats.rx_dropped++;=0A+=09/*=20The=20very=20=
first=20frame=20we=20receive=20from=20device=20has=20a=20fixed=204-byte=20=
value=0A+=09=20*=20We=20can=20safely=20skip=20it=0A+=09=20*/=0A+=09if=20=
(unlikely(=0A+=09=09urb->actual_length=20=3D=3D=20=
sizeof(ipheth_start_packet)=20&&=0A+=09=09memcmp(urb->transfer_buffer,=20=
ipheth_start_packet,=20sizeof(ipheth_start_packet))=20=3D=3D=200=0A+=09=
))=0A+=09=09goto=20rx_submit;=0A+=0A+=09retval=20=3D=20=
dev->rcvbulk_callback(urb);=0A+=09if=20(retval=20!=3D=200)=20{=0A+=09=09=
dev_err(&dev->intf->dev,=20"%s:=20callback=20retval:=20%d\n",=0A+=09=09=09=
__func__,=20retval);=0A=20=09=09return;=0A=20=09}=0A=20=0A-=09=
skb_put_data(skb,=20buf,=20len);=0A-=09skb->dev=20=3D=20dev->net;=0A-=09=
skb->protocol=20=3D=20eth_type_trans(skb,=20dev->net);=0A-=0A-=09=
dev->net->stats.rx_packets++;=0A-=09dev->net->stats.rx_bytes=20+=3D=20=
len;=0A+rx_submit:=0A=20=09dev->confirmed_pairing=20=3D=20true;=0A-=09=
netif_rx(skb);=0A=20=09ipheth_rx_submit(dev,=20GFP_ATOMIC);=0A=20}=0A=20=0A=
@@=20-310,6=20+395,27=20@@=20static=20int=20ipheth_get_macaddr(struct=20=
ipheth_device=20*dev)=0A=20=09return=20retval;=0A=20}=0A=20=0A+static=20=
int=20ipheth_enable_ncm(struct=20ipheth_device=20*dev)=0A+{=0A+=09struct=20=
usb_device=20*udev=20=3D=20dev->udev;=0A+=09int=20retval;=0A+=0A+=09=
retval=20=3D=20usb_control_msg(udev,=0A+=09=09=09=09=20=
usb_sndctrlpipe(udev,=20IPHETH_CTRL_ENDP),=0A+=09=09=09=09=20=
IPHETH_CMD_ENABLE_NCM,=20/*=20request=20*/=0A+=09=09=09=09=200x40,=20/*=20=
request=20type=20*/=0A+=09=09=09=09=200x00,=20/*=20value=20*/=0A+=09=09=09=
=09=200x02,=20/*=20index=20*/=0A+=09=09=09=09=20NULL,=0A+=09=09=09=09=20=
0,=0A+=09=09=09=09=20IPHETH_CTRL_TIMEOUT);=0A+=0A+=09=
dev_info(&dev->intf->dev,=20"%s:=20usb_control_msg:=20%d\n",=0A+=09=09=
__func__,=20retval);=0A+=0A+=09return=20retval;=0A+}=0A+=0A=20static=20=
int=20ipheth_rx_submit(struct=20ipheth_device=20*dev,=20gfp_t=20=
mem_flags)=0A=20{=0A=20=09struct=20usb_device=20*udev=20=3D=20dev->udev;=0A=
@@=20-317,7=20+423,7=20@@=20static=20int=20ipheth_rx_submit(struct=20=
ipheth_device=20*dev,=20gfp_t=20mem_flags)=0A=20=0A=20=09=
usb_fill_bulk_urb(dev->rx_urb,=20udev,=0A=20=09=09=09=20=20=
usb_rcvbulkpipe(udev,=20dev->bulk_in),=0A-=09=09=09=20=20dev->rx_buf,=20=
IPHETH_BUF_SIZE=20+=20IPHETH_IP_ALIGN,=0A+=09=09=09=20=20dev->rx_buf,=20=
IPHETH_RX_BUF_SIZE,=0A=20=09=09=09=20=20ipheth_rcvbulk_callback,=0A=20=09=
=09=09=20=20dev);=0A=20=09dev->rx_urb->transfer_flags=20|=3D=20=
URB_NO_TRANSFER_DMA_MAP;=0A@@=20-365,7=20+471,7=20@@=20static=20=
netdev_tx_t=20ipheth_tx(struct=20sk_buff=20*skb,=20struct=20net_device=20=
*net)=0A=20=09int=20retval;=0A=20=0A=20=09/*=20Paranoid=20*/=0A-=09if=20=
(skb->len=20>=20IPHETH_BUF_SIZE)=20{=0A+=09if=20(skb->len=20>=20=
IPHETH_TX_BUF_SIZE)=20{=0A=20=09=09WARN(1,=20"%s:=20skb=20too=20large:=20=
%d=20bytes\n",=20__func__,=20skb->len);=0A=20=09=09=
dev->net->stats.tx_dropped++;=0A=20=09=09dev_kfree_skb_any(skb);=0A@@=20=
-373,12=20+479,10=20@@=20static=20netdev_tx_t=20ipheth_tx(struct=20=
sk_buff=20*skb,=20struct=20net_device=20*net)=0A=20=09}=0A=20=0A=20=09=
memcpy(dev->tx_buf,=20skb->data,=20skb->len);=0A-=09if=20(skb->len=20<=20=
IPHETH_BUF_SIZE)=0A-=09=09memset(dev->tx_buf=20+=20skb->len,=200,=20=
IPHETH_BUF_SIZE=20-=20skb->len);=0A=20=0A=20=09=
usb_fill_bulk_urb(dev->tx_urb,=20udev,=0A=20=09=09=09=20=20=
usb_sndbulkpipe(udev,=20dev->bulk_out),=0A-=09=09=09=20=20dev->tx_buf,=20=
IPHETH_BUF_SIZE,=0A+=09=09=09=20=20dev->tx_buf,=20skb->len,=0A=20=09=09=09=
=20=20ipheth_sndbulk_callback,=0A=20=09=09=09=20=20dev);=0A=20=09=
dev->tx_urb->transfer_flags=20|=3D=20URB_NO_TRANSFER_DMA_MAP;=0A@@=20=
-450,6=20+554,7=20@@=20static=20int=20ipheth_probe(struct=20=
usb_interface=20*intf,=0A=20=09dev->net=20=3D=20netdev;=0A=20=09=
dev->intf=20=3D=20intf;=0A=20=09dev->confirmed_pairing=20=3D=20false;=0A=
+=09dev->rcvbulk_callback=20=3D=20ipheth_rcvbulk_callback_legacy;=0A=20=09=
/*=20Set=20up=20endpoints=20*/=0A=20=09hintf=20=3D=20=
usb_altnum_to_altsetting(intf,=20IPHETH_ALT_INTFNUM);=0A=20=09if=20=
(hintf=20=3D=3D=20NULL)=20{=0A@@=20-481,6=20+586,10=20@@=20static=20int=20=
ipheth_probe(struct=20usb_interface=20*intf,=0A=20=09if=20(retval)=0A=20=09=
=09goto=20err_get_macaddr;=0A=20=0A+=09retval=20=3D=20=
ipheth_enable_ncm(dev);=0A+=09if=20(retval=20=3D=3D=200)=0A+=09=09=
dev->rcvbulk_callback=20=3D=20ipheth_rcvbulk_callback_ncm;=0A+=0A=20=09=
INIT_DELAYED_WORK(&dev->carrier_work,=20ipheth_carrier_check_work);=0A=20=
=0A=20=09retval=20=3D=20ipheth_alloc_urbs(dev);=0A--=20=0A2.40.1=0A=0A=

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