[deliverable/linux.git] / drivers / net / usb / cdc_mbim.c

/*
 * Copyright (c) 2012  Smith Micro Software, Inc.
 * Copyright (c) 2012  Bjørn Mork <bjorn@mork.no>
 *
 * This driver is based on and reuse most of cdc_ncm, which is
 * Copyright (C) ST-Ericsson 2010-2012
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/ip.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <linux/usb/usbnet.h>
#include <linux/usb/cdc-wdm.h>
#include <linux/usb/cdc_ncm.h>

/* driver specific data - must match cdc_ncm usage */
struct cdc_mbim_state {
	struct cdc_ncm_ctx *ctx;
	atomic_t pmcount;
	struct usb_driver *subdriver;
	struct usb_interface *control;
	struct usb_interface *data;
};

/* using a counter to merge subdriver requests with our own into a combined state */
static int cdc_mbim_manage_power(struct usbnet *dev, int on)
{
	struct cdc_mbim_state *info = (void *)&dev->data;
	int rv = 0;

	dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);

	if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
		/* need autopm_get/put here to ensure the usbcore sees the new value */
		rv = usb_autopm_get_interface(dev->intf);
		if (rv < 0)
			goto err;
		dev->intf->needs_remote_wakeup = on;
		usb_autopm_put_interface(dev->intf);
	}
err:
	return rv;
}

static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status)
{
	struct usbnet *dev = usb_get_intfdata(intf);

	/* can be called while disconnecting */
	if (!dev)
		return 0;

	return cdc_mbim_manage_power(dev, status);
}


static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf)
{
	struct cdc_ncm_ctx *ctx;
	struct usb_driver *subdriver = ERR_PTR(-ENODEV);
	int ret = -ENODEV;
	u8 data_altsetting = CDC_NCM_DATA_ALTSETTING_NCM;
	struct cdc_mbim_state *info = (void *)&dev->data;

	/* see if interface supports MBIM alternate setting */
	if (intf->num_altsetting == 2) {
		if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
			usb_set_interface(dev->udev,
					  intf->cur_altsetting->desc.bInterfaceNumber,
					  CDC_NCM_COMM_ALTSETTING_MBIM);
		data_altsetting = CDC_NCM_DATA_ALTSETTING_MBIM;
	}

	/* Probably NCM, defer for cdc_ncm_bind */
	if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
		goto err;

	ret = cdc_ncm_bind_common(dev, intf, data_altsetting);
	if (ret)
		goto err;

	ctx = info->ctx;

	/* The MBIM descriptor and the status endpoint are required */
	if (ctx->mbim_desc && dev->status)
		subdriver = usb_cdc_wdm_register(ctx->control,
						 &dev->status->desc,
						 le16_to_cpu(ctx->mbim_desc->wMaxControlMessage),
						 cdc_mbim_wdm_manage_power);
	if (IS_ERR(subdriver)) {
		ret = PTR_ERR(subdriver);
		cdc_ncm_unbind(dev, intf);
		goto err;
	}

	/* can't let usbnet use the interrupt endpoint */
	dev->status = NULL;
	info->subdriver = subdriver;

	/* MBIM cannot do ARP */
	dev->net->flags |= IFF_NOARP;

	/* no need to put the VLAN tci in the packet headers */
	dev->net->features |= NETIF_F_HW_VLAN_TX;
err:
	return ret;
}

static void cdc_mbim_unbind(struct usbnet *dev, struct usb_interface *intf)
{
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;

	/* disconnect subdriver from control interface */
	if (info->subdriver && info->subdriver->disconnect)
		info->subdriver->disconnect(ctx->control);
	info->subdriver = NULL;

	/* let NCM unbind clean up both control and data interface */
	cdc_ncm_unbind(dev, intf);
}


static struct sk_buff *cdc_mbim_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
{
	struct sk_buff *skb_out;
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;
	__le32 sign = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN);
	u16 tci = 0;
	u8 *c;

	if (!ctx)
		goto error;

	if (skb) {
		if (skb->len <= sizeof(ETH_HLEN))
			goto error;

		/* mapping VLANs to MBIM sessions:
		 *   no tag     => IPS session <0>
		 *   1 - 255    => IPS session <vlanid>
		 *   256 - 511  => DSS session <vlanid - 256>
		 *   512 - 4095 => unsupported, drop
		 */
		vlan_get_tag(skb, &tci);

		switch (tci & 0x0f00) {
		case 0x0000: /* VLAN ID 0 - 255 */
			/* verify that datagram is IPv4 or IPv6 */
			skb_reset_mac_header(skb);
			switch (eth_hdr(skb)->h_proto) {
			case htons(ETH_P_IP):
			case htons(ETH_P_IPV6):
				break;
			default:
				goto error;
			}
			c = (u8 *)&sign;
			c[3] = tci;
			break;
		case 0x0100: /* VLAN ID 256 - 511 */
			sign = cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN);
			c = (u8 *)&sign;
			c[3] = tci;
			break;
		default:
			netif_err(dev, tx_err, dev->net,
				  "unsupported tci=0x%04x\n", tci);
			goto error;
		}
		skb_pull(skb, ETH_HLEN);
	}

	spin_lock_bh(&ctx->mtx);
	skb_out = cdc_ncm_fill_tx_frame(ctx, skb, sign);
	spin_unlock_bh(&ctx->mtx);
	return skb_out;

error:
	if (skb)
		dev_kfree_skb_any(skb);

	return NULL;
}

static struct sk_buff *cdc_mbim_process_dgram(struct usbnet *dev, u8 *buf, size_t len, u16 tci)
{
	__be16 proto = htons(ETH_P_802_3);
	struct sk_buff *skb = NULL;

	if (tci < 256) { /* IPS session? */
		if (len < sizeof(struct iphdr))
			goto err;

		switch (*buf & 0xf0) {
		case 0x40:
			proto = htons(ETH_P_IP);
			break;
		case 0x60:
			proto = htons(ETH_P_IPV6);
			break;
		default:
			goto err;
		}
	}

	skb = netdev_alloc_skb_ip_align(dev->net,  len + ETH_HLEN);
	if (!skb)
		goto err;

	/* add an ethernet header */
	skb_put(skb, ETH_HLEN);
	skb_reset_mac_header(skb);
	eth_hdr(skb)->h_proto = proto;
	memset(eth_hdr(skb)->h_source, 0, ETH_ALEN);
	memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);

	/* add datagram */
	memcpy(skb_put(skb, len), buf, len);

	/* map MBIM session to VLAN */
	if (tci)
		vlan_put_tag(skb, tci);
err:
	return skb;
}

static int cdc_mbim_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
{
	struct sk_buff *skb;
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;
	int len;
	int nframes;
	int x;
	int offset;
	struct usb_cdc_ncm_ndp16 *ndp16;
	struct usb_cdc_ncm_dpe16 *dpe16;
	int ndpoffset;
	int loopcount = 50; /* arbitrary max preventing infinite loop */
	u8 *c;
	u16 tci;

	ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
	if (ndpoffset < 0)
		goto error;

next_ndp:
	nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
	if (nframes < 0)
		goto error;

	ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);

	switch (ndp16->dwSignature & cpu_to_le32(0x00ffffff)) {
	case cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN):
		c = (u8 *)&ndp16->dwSignature;
		tci = c[3];
		break;
	case cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN):
		c = (u8 *)&ndp16->dwSignature;
		tci = c[3] + 256;
		break;
	default:
		netif_dbg(dev, rx_err, dev->net,
			  "unsupported NDP signature <0x%08x>\n",
			  le32_to_cpu(ndp16->dwSignature));
		goto err_ndp;

	}

	dpe16 = ndp16->dpe16;
	for (x = 0; x < nframes; x++, dpe16++) {
		offset = le16_to_cpu(dpe16->wDatagramIndex);
		len = le16_to_cpu(dpe16->wDatagramLength);

		/*
		 * CDC NCM ch. 3.7
		 * All entries after first NULL entry are to be ignored
		 */
		if ((offset == 0) || (len == 0)) {
			if (!x)
				goto err_ndp; /* empty NTB */
			break;
		}

		/* sanity checking */
		if (((offset + len) > skb_in->len) || (len > ctx->rx_max)) {
			netif_dbg(dev, rx_err, dev->net,
				  "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
				  x, offset, len, skb_in);
			if (!x)
				goto err_ndp;
			break;
		} else {
			skb = cdc_mbim_process_dgram(dev, skb_in->data + offset, len, tci);
			if (!skb)
				goto error;
			usbnet_skb_return(dev, skb);
		}
	}
err_ndp:
	/* are there more NDPs to process? */
	ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
	if (ndpoffset && loopcount--)
		goto next_ndp;

	return 1;
error:
	return 0;
}

static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
{
	int ret = 0;
	struct usbnet *dev = usb_get_intfdata(intf);
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;

	if (ctx == NULL) {
		ret = -1;
		goto error;
	}

	ret = usbnet_suspend(intf, message);
	if (ret < 0)
		goto error;

	if (intf == ctx->control && info->subdriver && info->subdriver->suspend)
		ret = info->subdriver->suspend(intf, message);
	if (ret < 0)
		usbnet_resume(intf);

error:
	return ret;
}

static int cdc_mbim_resume(struct usb_interface *intf)
{
	int  ret = 0;
	struct usbnet *dev = usb_get_intfdata(intf);
	struct cdc_mbim_state *info = (void *)&dev->data;
	struct cdc_ncm_ctx *ctx = info->ctx;
	bool callsub = (intf == ctx->control && info->subdriver && info->subdriver->resume);

	if (callsub)
		ret = info->subdriver->resume(intf);
	if (ret < 0)
		goto err;
	ret = usbnet_resume(intf);
	if (ret < 0 && callsub && info->subdriver->suspend)
		info->subdriver->suspend(intf, PMSG_SUSPEND);
err:
	return ret;
}

static const struct driver_info cdc_mbim_info = {
	.description = "CDC MBIM",
	.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN | FLAG_SEND_ZLP,
	.bind = cdc_mbim_bind,
	.unbind = cdc_mbim_unbind,
	.manage_power = cdc_mbim_manage_power,
	.rx_fixup = cdc_mbim_rx_fixup,
	.tx_fixup = cdc_mbim_tx_fixup,
};

static const struct usb_device_id mbim_devs[] = {
	/* This duplicate NCM entry is intentional. MBIM devices can
	 * be disguised as NCM by default, and this is necessary to
	 * allow us to bind the correct driver_info to such devices.
	 *
	 * bind() will sort out this for us, selecting the correct
	 * entry and reject the other
	 */
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
	  .driver_info = (unsigned long)&cdc_mbim_info,
	},
	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
	  .driver_info = (unsigned long)&cdc_mbim_info,
	},
	{
	},
};
MODULE_DEVICE_TABLE(usb, mbim_devs);

static struct usb_driver cdc_mbim_driver = {
	.name = "cdc_mbim",
	.id_table = mbim_devs,
	.probe = usbnet_probe,
	.disconnect = usbnet_disconnect,
	.suspend = cdc_mbim_suspend,
	.resume = cdc_mbim_resume,
	.reset_resume =	cdc_mbim_resume,
	.supports_autosuspend = 1,
	.disable_hub_initiated_lpm = 1,
};
module_usb_driver(cdc_mbim_driver);

MODULE_AUTHOR("Greg Suarez <gsuarez@smithmicro.com>");
MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
MODULE_DESCRIPTION("USB CDC MBIM host driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
9bf211a3 GS	1	/*
	2	* Copyright (c) 2012 Smith Micro Software, Inc.
	3	* Copyright (c) 2012 Bjørn Mork <bjorn@mork.no>
	4	*
	5	* This driver is based on and reuse most of cdc_ncm, which is
	6	* Copyright (C) ST-Ericsson 2010-2012
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/netdevice.h>
	15	#include <linux/ethtool.h>
a82c7ce5	16	#include <linux/if_vlan.h>
9bf211a3 GS	17	#include <linux/ip.h>
	18	#include <linux/mii.h>
	19	#include <linux/usb.h>
	20	#include <linux/usb/cdc.h>
	21	#include <linux/usb/usbnet.h>
	22	#include <linux/usb/cdc-wdm.h>
	23	#include <linux/usb/cdc_ncm.h>
	24
	25	/* driver specific data - must match cdc_ncm usage */
	26	struct cdc_mbim_state {
	27	struct cdc_ncm_ctx *ctx;
	28	atomic_t pmcount;
	29	struct usb_driver *subdriver;
	30	struct usb_interface *control;
	31	struct usb_interface *data;
	32	};
	33
	34	/* using a counter to merge subdriver requests with our own into a combined state */
	35	static int cdc_mbim_manage_power(struct usbnet *dev, int on)
	36	{
	37	struct cdc_mbim_state info = (void )&dev->data;
	38	int rv = 0;
	39
	40	dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);
	41
	42	if ((on && atomic_add_return(1, &info->pmcount) == 1) \|\| (!on && atomic_dec_and_test(&info->pmcount))) {
	43	/* need autopm_get/put here to ensure the usbcore sees the new value */
	44	rv = usb_autopm_get_interface(dev->intf);
	45	if (rv < 0)
	46	goto err;
	47	dev->intf->needs_remote_wakeup = on;
	48	usb_autopm_put_interface(dev->intf);
	49	}
	50	err:
	51	return rv;
	52	}
	53
	54	static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status)
	55	{
	56	struct usbnet *dev = usb_get_intfdata(intf);
	57
	58	/* can be called while disconnecting */
	59	if (!dev)
	60	return 0;
	61
	62	return cdc_mbim_manage_power(dev, status);
	63	}
	64
	65
	66	static int cdc_mbim_bind(struct usbnet dev, struct usb_interface intf)
	67	{
	68	struct cdc_ncm_ctx *ctx;
	69	struct usb_driver *subdriver = ERR_PTR(-ENODEV);
	70	int ret = -ENODEV;
	71	u8 data_altsetting = CDC_NCM_DATA_ALTSETTING_NCM;
	72	struct cdc_mbim_state info = (void )&dev->data;
	73
	74	/* see if interface supports MBIM alternate setting */
	75	if (intf->num_altsetting == 2) {
	76	if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
	77	usb_set_interface(dev->udev,
	78	intf->cur_altsetting->desc.bInterfaceNumber,
	79	CDC_NCM_COMM_ALTSETTING_MBIM);
	80	data_altsetting = CDC_NCM_DATA_ALTSETTING_MBIM;
81	}
82
83	/* Probably NCM, defer for cdc_ncm_bind */
84	if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
85	goto err;
86
87	ret = cdc_ncm_bind_common(dev, intf, data_altsetting);
88	if (ret)
89	goto err;
90
91	ctx = info->ctx;
92
93	/* The MBIM descriptor and the status endpoint are required */
94	if (ctx->mbim_desc && dev->status)
95	subdriver = usb_cdc_wdm_register(ctx->control,
96	&dev->status->desc,
97	le16_to_cpu(ctx->mbim_desc->wMaxControlMessage),
98	cdc_mbim_wdm_manage_power);
99	if (IS_ERR(subdriver)) {
100	ret = PTR_ERR(subdriver);
101	cdc_ncm_unbind(dev, intf);
102	goto err;
103	}
104
105	/* can't let usbnet use the interrupt endpoint */
106	dev->status = NULL;
107	info->subdriver = subdriver;
108
109	/* MBIM cannot do ARP */
110	dev->net->flags \|= IFF_NOARP;
a82c7ce5 BM	111
	112	/* no need to put the VLAN tci in the packet headers */
	113	dev->net->features \|= NETIF_F_HW_VLAN_TX;
9bf211a3 GS	114	err:
	115	return ret;
	116	}
	117
	118	static void cdc_mbim_unbind(struct usbnet dev, struct usb_interface intf)
	119	{
	120	struct cdc_mbim_state info = (void )&dev->data;
	121	struct cdc_ncm_ctx *ctx = info->ctx;
	122
	123	/* disconnect subdriver from control interface */
	124	if (info->subdriver && info->subdriver->disconnect)
	125	info->subdriver->disconnect(ctx->control);
	126	info->subdriver = NULL;
	127
	128	/* let NCM unbind clean up both control and data interface */
	129	cdc_ncm_unbind(dev, intf);
	130	}
	131
	132
	133	static struct sk_buff cdc_mbim_tx_fixup(struct usbnet dev, struct sk_buff *skb, gfp_t flags)
	134	{
	135	struct sk_buff *skb_out;
	136	struct cdc_mbim_state info = (void )&dev->data;
	137	struct cdc_ncm_ctx *ctx = info->ctx;
a82c7ce5 BM	138	__le32 sign = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN);
	139	u16 tci = 0;
	140	u8 *c;
9bf211a3 GS	141
	142	if (!ctx)
	143	goto error;
	144
	145	if (skb) {
	146	if (skb->len <= sizeof(ETH_HLEN))
	147	goto error;
	148
a82c7ce5 BM	149	/* mapping VLANs to MBIM sessions:
	150	* no tag => IPS session <0>
	151	* 1 - 255 => IPS session <vlanid>
9f651cac BM	152	* 256 - 511 => DSS session <vlanid - 256>
9f651cac BM	153	* 512 - 4095 => unsupported, drop
a82c7ce5 BM	154	*/
	155	vlan_get_tag(skb, &tci);
	156
	157	switch (tci & 0x0f00) {
	158	case 0x0000: /* VLAN ID 0 - 255 */
9f651cac BM	159	/* verify that datagram is IPv4 or IPv6 */
	160	skb_reset_mac_header(skb);
	161	switch (eth_hdr(skb)->h_proto) {
	162	case htons(ETH_P_IP):
	163	case htons(ETH_P_IPV6):
	164	break;
	165	default:
	166	goto error;
	167	}
	168	c = (u8 *)&sign;
	169	c[3] = tci;
	170	break;
	171	case 0x0100: /* VLAN ID 256 - 511 */
	172	sign = cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN);
a82c7ce5 BM	173	c = (u8 *)&sign;
	174	c[3] = tci;
	175	break;
	176	default:
	177	netif_err(dev, tx_err, dev->net,
	178	"unsupported tci=0x%04x\n", tci);
	179	goto error;
	180	}
9f651cac	181	skb_pull(skb, ETH_HLEN);
9bf211a3 GS	182	}
	183
	184	spin_lock_bh(&ctx->mtx);
a82c7ce5	185	skb_out = cdc_ncm_fill_tx_frame(ctx, skb, sign);
9bf211a3 GS	186	spin_unlock_bh(&ctx->mtx);
	187	return skb_out;
	188
	189	error:
	190	if (skb)
	191	dev_kfree_skb_any(skb);
	192
	193	return NULL;
	194	}
	195
a82c7ce5	196	static struct sk_buff cdc_mbim_process_dgram(struct usbnet dev, u8 *buf, size_t len, u16 tci)
9bf211a3	197	{
9f651cac	198	__be16 proto = htons(ETH_P_802_3);
9bf211a3 GS	199	struct sk_buff *skb = NULL;
9bf211a3 GS	200
9f651cac BM	201	if (tci < 256) { /* IPS session? */
	202	if (len < sizeof(struct iphdr))
	203	goto err;
a82c7ce5	204
9f651cac BM	205	switch (*buf & 0xf0) {
	206	case 0x40:
	207	proto = htons(ETH_P_IP);
	208	break;
	209	case 0x60:
	210	proto = htons(ETH_P_IPV6);
	211	break;
	212	default:
	213	goto err;
	214	}
9bf211a3 GS	215	}
	216
	217	skb = netdev_alloc_skb_ip_align(dev->net, len + ETH_HLEN);
	218	if (!skb)
	219	goto err;
	220
	221	/* add an ethernet header */
	222	skb_put(skb, ETH_HLEN);
	223	skb_reset_mac_header(skb);
	224	eth_hdr(skb)->h_proto = proto;
	225	memset(eth_hdr(skb)->h_source, 0, ETH_ALEN);
	226	memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
	227
	228	/* add datagram */
	229	memcpy(skb_put(skb, len), buf, len);
a82c7ce5 BM	230
	231	/* map MBIM session to VLAN */
	232	if (tci)
	233	vlan_put_tag(skb, tci);
9bf211a3 GS	234	err:
	235	return skb;
	236	}
	237
	238	static int cdc_mbim_rx_fixup(struct usbnet dev, struct sk_buff skb_in)
	239	{
	240	struct sk_buff *skb;
a82c7ce5 BM	241	struct cdc_mbim_state info = (void )&dev->data;
a82c7ce5 BM	242	struct cdc_ncm_ctx *ctx = info->ctx;
9bf211a3 GS	243	int len;
	244	int nframes;
	245	int x;
	246	int offset;
	247	struct usb_cdc_ncm_ndp16 *ndp16;
	248	struct usb_cdc_ncm_dpe16 *dpe16;
	249	int ndpoffset;
	250	int loopcount = 50; /* arbitrary max preventing infinite loop */
a82c7ce5 BM	251	u8 *c;
a82c7ce5 BM	252	u16 tci;
9bf211a3 GS	253
	254	ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
	255	if (ndpoffset < 0)
	256	goto error;
	257
	258	next_ndp:
	259	nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
	260	if (nframes < 0)
	261	goto error;
	262
	263	ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
	264
a82c7ce5	265	switch (ndp16->dwSignature & cpu_to_le32(0x00ffffff)) {
9bf211a3	266	case cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN):
a82c7ce5 BM	267	c = (u8 *)&ndp16->dwSignature;
a82c7ce5 BM	268	tci = c[3];
9bf211a3	269	break;
9f651cac BM	270	case cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN):
	271	c = (u8 *)&ndp16->dwSignature;
	272	tci = c[3] + 256;
	273	break;
9bf211a3 GS	274	default:
	275	netif_dbg(dev, rx_err, dev->net,
	276	"unsupported NDP signature <0x%08x>\n",
	277	le32_to_cpu(ndp16->dwSignature));
	278	goto err_ndp;
	279
	280	}
	281
	282	dpe16 = ndp16->dpe16;
	283	for (x = 0; x < nframes; x++, dpe16++) {
	284	offset = le16_to_cpu(dpe16->wDatagramIndex);
	285	len = le16_to_cpu(dpe16->wDatagramLength);
	286
	287	/*
	288	* CDC NCM ch. 3.7
	289	* All entries after first NULL entry are to be ignored
	290	*/
	291	if ((offset == 0) \|\| (len == 0)) {
	292	if (!x)
	293	goto err_ndp; /* empty NTB */
	294	break;
	295	}
	296
	297	/* sanity checking */
a82c7ce5	298	if (((offset + len) > skb_in->len) \|\| (len > ctx->rx_max)) {
9bf211a3 GS	299	netif_dbg(dev, rx_err, dev->net,
	300	"invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
	301	x, offset, len, skb_in);
	302	if (!x)
	303	goto err_ndp;
	304	break;
	305	} else {
a82c7ce5	306	skb = cdc_mbim_process_dgram(dev, skb_in->data + offset, len, tci);
9bf211a3 GS	307	if (!skb)
	308	goto error;
	309	usbnet_skb_return(dev, skb);
	310	}
	311	}
	312	err_ndp:
	313	/* are there more NDPs to process? */
	314	ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
	315	if (ndpoffset && loopcount--)
	316	goto next_ndp;
	317
	318	return 1;
	319	error:
	320	return 0;
	321	}
	322
	323	static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
	324	{
	325	int ret = 0;
	326	struct usbnet *dev = usb_get_intfdata(intf);
	327	struct cdc_mbim_state info = (void )&dev->data;
	328	struct cdc_ncm_ctx *ctx = info->ctx;
	329
	330	if (ctx == NULL) {
	331	ret = -1;
	332	goto error;
	333	}
	334
	335	ret = usbnet_suspend(intf, message);
	336	if (ret < 0)
	337	goto error;
	338
	339	if (intf == ctx->control && info->subdriver && info->subdriver->suspend)
	340	ret = info->subdriver->suspend(intf, message);
	341	if (ret < 0)
	342	usbnet_resume(intf);
	343
	344	error:
	345	return ret;
	346	}
	347
	348	static int cdc_mbim_resume(struct usb_interface *intf)
	349	{
	350	int ret = 0;
	351	struct usbnet *dev = usb_get_intfdata(intf);
	352	struct cdc_mbim_state info = (void )&dev->data;
	353	struct cdc_ncm_ctx *ctx = info->ctx;
	354	bool callsub = (intf == ctx->control && info->subdriver && info->subdriver->resume);
	355
	356	if (callsub)
	357	ret = info->subdriver->resume(intf);
	358	if (ret < 0)
	359	goto err;
	360	ret = usbnet_resume(intf);
	361	if (ret < 0 && callsub && info->subdriver->suspend)
	362	info->subdriver->suspend(intf, PMSG_SUSPEND);
	363	err:
	364	return ret;
	365	}
	366
	367	static const struct driver_info cdc_mbim_info = {
	368	.description = "CDC MBIM",
328d7b8a	369	.flags = FLAG_NO_SETINT \| FLAG_MULTI_PACKET \| FLAG_WWAN \| FLAG_SEND_ZLP,
9bf211a3 GS	370	.bind = cdc_mbim_bind,
	371	.unbind = cdc_mbim_unbind,
	372	.manage_power = cdc_mbim_manage_power,
	373	.rx_fixup = cdc_mbim_rx_fixup,
	374	.tx_fixup = cdc_mbim_tx_fixup,
	375	};
	376
	377	static const struct usb_device_id mbim_devs[] = {
	378	/* This duplicate NCM entry is intentional. MBIM devices can
	379	* be disguised as NCM by default, and this is necessary to
	380	* allow us to bind the correct driver_info to such devices.
	381	*
	382	* bind() will sort out this for us, selecting the correct
	383	* entry and reject the other
	384	*/
	385	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
	386	.driver_info = (unsigned long)&cdc_mbim_info,
	387	},
	388	{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
	389	.driver_info = (unsigned long)&cdc_mbim_info,
	390	},
	391	{
	392	},
	393	};
	394	MODULE_DEVICE_TABLE(usb, mbim_devs);
	395
	396	static struct usb_driver cdc_mbim_driver = {
	397	.name = "cdc_mbim",
	398	.id_table = mbim_devs,
	399	.probe = usbnet_probe,
	400	.disconnect = usbnet_disconnect,
	401	.suspend = cdc_mbim_suspend,
	402	.resume = cdc_mbim_resume,
	403	.reset_resume = cdc_mbim_resume,
	404	.supports_autosuspend = 1,
	405	.disable_hub_initiated_lpm = 1,
	406	};
	407	module_usb_driver(cdc_mbim_driver);
	408
	409	MODULE_AUTHOR("Greg Suarez <gsuarez@smithmicro.com>");
	410	MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
	411	MODULE_DESCRIPTION("USB CDC MBIM host driver");
	412	MODULE_LICENSE("GPL");