net/usb: Ethernet quirks for the LG-VL600 4G modem (7a635ea9) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/net/usb/Kconfig

+15 −0

Original line number	Diff line number	Diff line
		@@ -433,4 +433,19 @@ config USB_SIERRA_NET
		To compile this driver as a module, choose M here: the
		module will be called sierra_net.

		config USB_VL600
		tristate "LG VL600 modem dongle"
		depends on USB_NET_CDCETHER
		select USB_ACM
		help
		Select this if you want to use an LG Electronics 4G/LTE usb modem
		called VL600. This driver only handles the ethernet
		interface exposed by the modem firmware. To establish a connection
		you will first need a userspace program that sends the right
		command to the modem through its CDC ACM port, and most
		likely also a DHCP client. See this thread about using the
		4G modem from Verizon:

		http://ubuntuforums.org/showpost.php?p=10589647&postcount=17

		endmenu

drivers/net/usb/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -27,4 +27,5 @@ obj-$(CONFIG_USB_IPHETH) += ipheth.o
		obj-$(CONFIG_USB_SIERRA_NET) += sierra_net.o
		obj-$(CONFIG_USB_NET_CX82310_ETH) += cx82310_eth.o
		obj-$(CONFIG_USB_NET_CDC_NCM) += cdc_ncm.o
		obj-$(CONFIG_USB_VL600) += lg-vl600.o

drivers/net/usb/cdc_ether.c

+15 −6

Original line number	Diff line number	Diff line
		@@ -378,7 +378,7 @@ static void dumpspeed(struct usbnet dev, __le32 speeds)
		__le32_to_cpu(speeds[1]) / 1000);
		}

		static void cdc_status(struct usbnet dev, struct urb urb)
		void usbnet_cdc_status(struct usbnet dev, struct urb urb)
		{
		struct usb_cdc_notification *event;

		@@ -418,8 +418,9 @@ static void cdc_status(struct usbnet dev, struct urb urb)
		break;
		}
		}
		EXPORT_SYMBOL_GPL(usbnet_cdc_status);

		static int cdc_bind(struct usbnet dev, struct usb_interface intf)
		int usbnet_cdc_bind(struct usbnet dev, struct usb_interface intf)
		{
		int status;
		struct cdc_state info = (void ) &dev->data;
		@@ -441,6 +442,7 @@ static int cdc_bind(struct usbnet dev, struct usb_interface intf)
		*/
		return 0;
		}
		EXPORT_SYMBOL_GPL(usbnet_cdc_bind);

		static int cdc_manage_power(struct usbnet *dev, int on)
		{
		@@ -452,18 +454,18 @@ static const struct driver_info cdc_info = {
		.description = "CDC Ethernet Device",
		.flags = FLAG_ETHER,
		// .check_connect = cdc_check_connect,
		.bind = cdc_bind,
		.bind = usbnet_cdc_bind,
		.unbind = usbnet_cdc_unbind,
		.status = cdc_status,
		.status = usbnet_cdc_status,
		.manage_power = cdc_manage_power,
		};

		static const struct driver_info mbm_info = {
		.description = "Mobile Broadband Network Device",
		.flags = FLAG_WWAN,
		.bind = cdc_bind,
		.bind = usbnet_cdc_bind,
		.unbind = usbnet_cdc_unbind,
		.status = cdc_status,
		.status = usbnet_cdc_status,
		.manage_power = cdc_manage_power,
		};

		@@ -560,6 +562,13 @@ static const struct usb_device_id products [] = {
		.driver_info = 0,
		},

		/* LG Electronics VL600 wants additional headers on every frame */
		{
		USB_DEVICE_AND_INTERFACE_INFO(0x1004, 0x61aa, USB_CLASS_COMM,
		USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
		.driver_info = 0,
		},

		/*
		* WHITELIST!!!
		*

drivers/net/usb/lg-vl600.c

0 → 100644

+346 −0

Original line number	Diff line number	Diff line
		/*
		* Ethernet interface part of the LG VL600 LTE modem (4G dongle)
		*
		* Copyright (C) 2011 Intel Corporation
		* Author: Andrzej Zaborowski <balrogg@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License as published by
		* the Free Software Foundation; either version 2 of the License, or
		* (at your option) any later version.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/
		#include <linux/etherdevice.h>
		#include <linux/ethtool.h>
		#include <linux/mii.h>
		#include <linux/usb.h>
		#include <linux/usb/cdc.h>
		#include <linux/usb/usbnet.h>
		#include <linux/if_ether.h>
		#include <linux/if_arp.h>
		#include <linux/inetdevice.h>

		/*
		* The device has a CDC ACM port for modem control (it claims to be
		* CDC ACM anyway) and a CDC Ethernet port for actual network data.
		* It will however ignore data on both ports that is not encapsulated
		* in a specific way, any data returned is also encapsulated the same
		* way. The headers don't seem to follow any popular standard.
		*
		* This driver adds and strips these headers from the ethernet frames
		* sent/received from the CDC Ethernet port. The proprietary header
		* replaces the standard ethernet header in a packet so only actual
		* ethernet frames are allowed. The headers allow some form of
		* multiplexing by using non standard values of the .h_proto field.
		* Windows/Mac drivers do send a couple of such frames to the device
		* during initialisation, with protocol set to 0x0906 or 0x0b06 and (what
		* seems to be) a flag in the .dummy_flags. This doesn't seem necessary
		* for modem operation but can possibly be used for GPS or other funcitons.
		*/

		struct vl600_frame_hdr {
		__le32 len;
		__le32 serial;
		__le32 pkt_cnt;
		__le32 dummy_flags;
		__le32 dummy;
		__le32 magic;
		} __attribute__((packed));

		struct vl600_pkt_hdr {
		__le32 dummy[2];
		__le32 len;
		__be16 h_proto;
		} __attribute__((packed));

		struct vl600_state {
		struct sk_buff *current_rx_buf;
		};

		static int vl600_bind(struct usbnet dev, struct usb_interface intf)
		{
		int ret;
		struct vl600_state *s = kzalloc(sizeof(struct vl600_state), GFP_KERNEL);

		if (!s)
		return -ENOMEM;

		ret = usbnet_cdc_bind(dev, intf);
		if (ret) {
		kfree(s);
		return ret;
		}

		dev->driver_priv = s;

		/* ARP packets don't go through, but they're also of no use. The
		* subnet has only two hosts anyway: us and the gateway / DHCP
		* server (probably simulated by modem firmware or network operator)
		* whose address changes everytime we connect to the intarwebz and
		* who doesn't bother answering ARP requests either. So hardware
		* addresses have no meaning, the destination and the source of every
		* packet depend only on whether it is on the IN or OUT endpoint. */
		dev->net->flags \|= IFF_NOARP;

		return ret;
		}

		static void vl600_unbind(struct usbnet dev, struct usb_interface intf)
		{
		struct vl600_state *s = dev->driver_priv;

		if (s->current_rx_buf)
		dev_kfree_skb(s->current_rx_buf);

		kfree(s);

		return usbnet_cdc_unbind(dev, intf);
		}

		static int vl600_rx_fixup(struct usbnet dev, struct sk_buff skb)
		{
		struct vl600_frame_hdr *frame;
		struct vl600_pkt_hdr *packet;
		struct ethhdr *ethhdr;
		int packet_len, count;
		struct sk_buff *buf = skb;
		struct sk_buff *clone;
		struct vl600_state *s = dev->driver_priv;

		/* Frame lengths are generally 4B multiplies but every couple of
		* hours there's an odd number of bytes sized yet correct frame,
		* so don't require this. */

		/* Allow a packet (or multiple packets batched together) to be
		* split across many frames. We don't allow a new batch to
		* begin in the same frame another one is ending however, and no
		* leading or trailing pad bytes. */
		if (s->current_rx_buf) {
		frame = (struct vl600_frame_hdr *) s->current_rx_buf->data;
		if (skb->len + s->current_rx_buf->len >
		le32_to_cpup(&frame->len)) {
		netif_err(dev, ifup, dev->net, "Fragment too long\n");
		dev->net->stats.rx_length_errors++;
		goto error;
		}

		buf = s->current_rx_buf;
		memcpy(skb_put(buf, skb->len), skb->data, skb->len);
		} else if (skb->len < 4) {
		netif_err(dev, ifup, dev->net, "Frame too short\n");
		dev->net->stats.rx_length_errors++;
		goto error;
		}

		frame = (struct vl600_frame_hdr *) buf->data;
		/* NOTE: Should check that frame->magic == 0x53544448?
		* Otherwise if we receive garbage at the beginning of the frame
		* we may end up allocating a huge buffer and saving all the
		* future incoming data into it. */

		if (buf->len < sizeof(*frame) \|\|
		buf->len != le32_to_cpup(&frame->len)) {
		/* Save this fragment for later assembly */
		if (s->current_rx_buf)
		return 0;

		s->current_rx_buf = skb_copy_expand(skb, 0,
		le32_to_cpup(&frame->len), GFP_ATOMIC);
		if (!s->current_rx_buf) {
		netif_err(dev, ifup, dev->net, "Reserving %i bytes "
		"for packet assembly failed.\n",
		le32_to_cpup(&frame->len));
		dev->net->stats.rx_errors++;
		}

		return 0;
		}

		count = le32_to_cpup(&frame->pkt_cnt);

		skb_pull(buf, sizeof(*frame));

		while (count--) {
		if (buf->len < sizeof(*packet)) {
		netif_err(dev, ifup, dev->net, "Packet too short\n");
		goto error;
		}

		packet = (struct vl600_pkt_hdr *) buf->data;
		packet_len = sizeof(*packet) + le32_to_cpup(&packet->len);
		if (packet_len > buf->len) {
		netif_err(dev, ifup, dev->net,
		"Bad packet length stored in header\n");
		goto error;
		}

		/* Packet header is same size as the ethernet header
		* (sizeof(packet) == sizeof(ethhdr)), additionally
		* the h_proto field is in the same place so we just leave it
		* alone and fill in the remaining fields.
		*/
		ethhdr = (struct ethhdr *) skb->data;
		if (be16_to_cpup(&ethhdr->h_proto) == ETH_P_ARP &&
		buf->len > 0x26) {
		/* Copy the addresses from packet contents */
		memcpy(ethhdr->h_source,
		&buf->data[sizeof(*ethhdr) + 0x8],
		ETH_ALEN);
		memcpy(ethhdr->h_dest,
		&buf->data[sizeof(*ethhdr) + 0x12],
		ETH_ALEN);
		} else {
		memset(ethhdr->h_source, 0, ETH_ALEN);
		memcpy(ethhdr->h_dest, dev->net->dev_addr, ETH_ALEN);
		}

		if (count) {
		/* Not the last packet in this batch */
		clone = skb_clone(buf, GFP_ATOMIC);
		if (!clone)
		goto error;

		skb_trim(clone, packet_len);
		usbnet_skb_return(dev, clone);

		skb_pull(buf, (packet_len + 3) & ~3);
		} else {
		skb_trim(buf, packet_len);

		if (s->current_rx_buf) {
		usbnet_skb_return(dev, buf);
		s->current_rx_buf = NULL;
		return 0;
		}

		return 1;
		}
		}

		error:
		if (s->current_rx_buf) {
		dev_kfree_skb_any(s->current_rx_buf);
		s->current_rx_buf = NULL;
		}
		dev->net->stats.rx_errors++;
		return 0;
		}

		static struct sk_buff vl600_tx_fixup(struct usbnet dev,
		struct sk_buff *skb, gfp_t flags)
		{
		struct sk_buff *ret;
		struct vl600_frame_hdr *frame;
		struct vl600_pkt_hdr *packet;
		static uint32_t serial = 1;
		int orig_len = skb->len - sizeof(struct ethhdr);
		int full_len = (skb->len + sizeof(struct vl600_frame_hdr) + 3) & ~3;

		frame = (struct vl600_frame_hdr *) skb->data;
		if (skb->len > sizeof(*frame) && skb->len == le32_to_cpup(&frame->len))
		return skb; /* Already encapsulated? */

		if (skb->len < sizeof(struct ethhdr))
		/* Drop, device can only deal with ethernet packets */
		return NULL;

		if (!skb_cloned(skb)) {
		int headroom = skb_headroom(skb);
		int tailroom = skb_tailroom(skb);

		if (tailroom >= full_len - skb->len - sizeof(*frame) &&
		headroom >= sizeof(*frame))
		/* There's enough head and tail room */
		goto encapsulate;

		if (headroom + tailroom + skb->len >= full_len) {
		/* There's enough total room, just readjust */
		skb->data = memmove(skb->head + sizeof(*frame),
		skb->data, skb->len);
		skb_set_tail_pointer(skb, skb->len);
		goto encapsulate;
		}
		}

		/* Alloc a new skb with the required size */
		ret = skb_copy_expand(skb, sizeof(struct vl600_frame_hdr), full_len -
		skb->len - sizeof(struct vl600_frame_hdr), flags);
		dev_kfree_skb_any(skb);
		if (!ret)
		return ret;
		skb = ret;

		encapsulate:
		/* Packet header is same size as ethernet packet header
		* (sizeof(*packet) == sizeof(struct ethhdr)), additionally the
		* h_proto field is in the same place so we just leave it alone and
		* overwrite the remaining fields.
		*/
		packet = (struct vl600_pkt_hdr *) skb->data;
		memset(&packet->dummy, 0, sizeof(packet->dummy));
		packet->len = cpu_to_le32(orig_len);

		frame = (struct vl600_frame_hdr ) skb_push(skb, sizeof(frame));
		memset(frame, 0, sizeof(*frame));
		frame->len = cpu_to_le32(full_len);
		frame->serial = cpu_to_le32(serial++);
		frame->pkt_cnt = cpu_to_le32(1);

		if (skb->len < full_len) /* Pad */
		skb_put(skb, full_len - skb->len);

		return skb;
		}

		static const struct driver_info vl600_info = {
		.description = "LG VL600 modem",
		.flags = FLAG_ETHER \| FLAG_RX_ASSEMBLE,
		.bind = vl600_bind,
		.unbind = vl600_unbind,
		.status = usbnet_cdc_status,
		.rx_fixup = vl600_rx_fixup,
		.tx_fixup = vl600_tx_fixup,
		};

		static const struct usb_device_id products[] = {
		{
		USB_DEVICE_AND_INTERFACE_INFO(0x1004, 0x61aa, USB_CLASS_COMM,
		USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
		.driver_info = (unsigned long) &vl600_info,
		},
		{}, /* End */
		};
		MODULE_DEVICE_TABLE(usb, products);

		static struct usb_driver lg_vl600_driver = {
		.name = "lg-vl600",
		.id_table = products,
		.probe = usbnet_probe,
		.disconnect = usbnet_disconnect,
		.suspend = usbnet_suspend,
		.resume = usbnet_resume,
		};

		static int __init vl600_init(void)
		{
		return usb_register(&lg_vl600_driver);
		}
		module_init(vl600_init);

		static void __exit vl600_exit(void)
		{
		usb_deregister(&lg_vl600_driver);
		}
		module_exit(vl600_exit);

		MODULE_AUTHOR("Anrzej Zaborowski");
		MODULE_DESCRIPTION("LG-VL600 modem's ethernet link");
		MODULE_LICENSE("GPL");

drivers/net/usb/usbnet.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -387,8 +387,12 @@ static int rx_submit (struct usbnet dev, struct urb urb, gfp_t flags)
		static inline void rx_process (struct usbnet dev, struct sk_buff skb)
		{
		if (dev->driver_info->rx_fixup &&
		!dev->driver_info->rx_fixup (dev, skb))
		goto error;
		!dev->driver_info->rx_fixup (dev, skb)) {
		/* With RX_ASSEMBLE, rx_fixup() must update counters */
		if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
		dev->net->stats.rx_errors++;
		goto done;
		}
		// else network stack removes extra byte if we forced a short packet

		if (skb->len) {
		@@ -401,8 +405,8 @@ static inline void rx_process (struct usbnet dev, struct sk_buff skb)
		}

		netif_dbg(dev, rx_err, dev->net, "drop\n");
		error:
		dev->net->stats.rx_errors++;
		done:
		skb_queue_tail(&dev->done, skb);
		}