f_ncm.c 42.9 KB
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/*
 * f_ncm.c -- USB CDC Network (NCM) link function driver
 *
 * Copyright (C) 2010 Nokia Corporation
 * Contact: Yauheni Kaliuta <yauheni.kaliuta@nokia.com>
 *
 * The driver borrows from f_ecm.c which is:
 *
 * Copyright (C) 2003-2005,2008 David Brownell
 * Copyright (C) 2008 Nokia Corporation
 *
 * 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.
 */

#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/crc32.h>

#include <linux/usb/cdc.h>

#include "u_ether.h"
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#include "u_ether_configfs.h"
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#include "u_ncm.h"
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/*
 * This function is a "CDC Network Control Model" (CDC NCM) Ethernet link.
 * NCM is intended to be used with high-speed network attachments.
 *
 * Note that NCM requires the use of "alternate settings" for its data
 * interface.  This means that the set_alt() method has real work to do,
 * and also means that a get_alt() method is required.
 */

/* to trigger crc/non-crc ndp signature */

#define NCM_NDP_HDR_CRC_MASK	0x01000000
#define NCM_NDP_HDR_CRC		0x01000000
#define NCM_NDP_HDR_NOCRC	0x00000000

enum ncm_notify_state {
	NCM_NOTIFY_NONE,		/* don't notify */
	NCM_NOTIFY_CONNECT,		/* issue CONNECT next */
	NCM_NOTIFY_SPEED,		/* issue SPEED_CHANGE next */
};

struct f_ncm {
	struct gether			port;
	u8				ctrl_id, data_id;

	char				ethaddr[14];

	struct usb_ep			*notify;
	struct usb_request		*notify_req;
	u8				notify_state;
	bool				is_open;

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	const struct ndp_parser_opts	*parser_opts;
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	bool				is_crc;
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	u32				ndp_sign;
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	/*
	 * for notification, it is accessed from both
	 * callback and ethernet open/close
	 */
	spinlock_t			lock;
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	struct net_device		*netdev;

	/* For multi-frame NDP TX */
	struct sk_buff			*skb_tx_data;
	struct sk_buff			*skb_tx_ndp;
	u16				ndp_dgram_count;
	bool				timer_force_tx;
	struct tasklet_struct		tx_tasklet;
	struct hrtimer			task_timer;

	bool				timer_stopping;
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};

static inline struct f_ncm *func_to_ncm(struct usb_function *f)
{
	return container_of(f, struct f_ncm, port.func);
}

/* peak (theoretical) bulk transfer rate in bits-per-second */
static inline unsigned ncm_bitrate(struct usb_gadget *g)
{
	if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
		return 13 * 512 * 8 * 1000 * 8;
	else
		return 19 *  64 * 1 * 1000 * 8;
}

/*-------------------------------------------------------------------------*/

/*
 * We cannot group frames so use just the minimal size which ok to put
 * one max-size ethernet frame.
 * If the host can group frames, allow it to do that, 16K is selected,
 * because it's used by default by the current linux host driver
 */
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#define NTB_DEFAULT_IN_SIZE	16384
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#define NTB_OUT_SIZE		16384

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/* Allocation for storing the NDP, 32 should suffice for a
 * 16k packet. This allows a maximum of 32 * 507 Byte packets to
 * be transmitted in a single 16kB skb, though when sending full size
 * packets this limit will be plenty.
 * Smaller packets are not likely to be trying to maximize the
 * throughput and will be mstly sending smaller infrequent frames.
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 */
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#define TX_MAX_NUM_DPE		32
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/* Delay for the transmit to wait before sending an unfilled NTB frame. */
#define TX_TIMEOUT_NSECS	300000
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#define FORMATS_SUPPORTED	(USB_CDC_NCM_NTB16_SUPPORTED |	\
				 USB_CDC_NCM_NTB32_SUPPORTED)

static struct usb_cdc_ncm_ntb_parameters ntb_parameters = {
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	.wLength = cpu_to_le16(sizeof(ntb_parameters)),
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	.bmNtbFormatsSupported = cpu_to_le16(FORMATS_SUPPORTED),
	.dwNtbInMaxSize = cpu_to_le32(NTB_DEFAULT_IN_SIZE),
	.wNdpInDivisor = cpu_to_le16(4),
	.wNdpInPayloadRemainder = cpu_to_le16(0),
	.wNdpInAlignment = cpu_to_le16(4),

	.dwNtbOutMaxSize = cpu_to_le32(NTB_OUT_SIZE),
	.wNdpOutDivisor = cpu_to_le16(4),
	.wNdpOutPayloadRemainder = cpu_to_le16(0),
	.wNdpOutAlignment = cpu_to_le16(4),
};

/*
 * Use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
 * packet, to simplify cancellation; and a big transfer interval, to
 * waste less bandwidth.
 */

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#define NCM_STATUS_INTERVAL_MS		32
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#define NCM_STATUS_BYTECOUNT		16	/* 8 byte header + data */

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static struct usb_interface_assoc_descriptor ncm_iad_desc = {
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	.bLength =		sizeof ncm_iad_desc,
	.bDescriptorType =	USB_DT_INTERFACE_ASSOCIATION,

	/* .bFirstInterface =	DYNAMIC, */
	.bInterfaceCount =	2,	/* control + data */
	.bFunctionClass =	USB_CLASS_COMM,
	.bFunctionSubClass =	USB_CDC_SUBCLASS_NCM,
	.bFunctionProtocol =	USB_CDC_PROTO_NONE,
	/* .iFunction =		DYNAMIC */
};

/* interface descriptor: */

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static struct usb_interface_descriptor ncm_control_intf = {
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	.bLength =		sizeof ncm_control_intf,
	.bDescriptorType =	USB_DT_INTERFACE,

	/* .bInterfaceNumber = DYNAMIC */
	.bNumEndpoints =	1,
	.bInterfaceClass =	USB_CLASS_COMM,
	.bInterfaceSubClass =	USB_CDC_SUBCLASS_NCM,
	.bInterfaceProtocol =	USB_CDC_PROTO_NONE,
	/* .iInterface = DYNAMIC */
};

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static struct usb_cdc_header_desc ncm_header_desc = {
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	.bLength =		sizeof ncm_header_desc,
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_HEADER_TYPE,

	.bcdCDC =		cpu_to_le16(0x0110),
};

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static struct usb_cdc_union_desc ncm_union_desc = {
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	.bLength =		sizeof(ncm_union_desc),
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_UNION_TYPE,
	/* .bMasterInterface0 =	DYNAMIC */
	/* .bSlaveInterface0 =	DYNAMIC */
};

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static struct usb_cdc_ether_desc ecm_desc = {
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	.bLength =		sizeof ecm_desc,
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_ETHERNET_TYPE,

	/* this descriptor actually adds value, surprise! */
	/* .iMACAddress = DYNAMIC */
	.bmEthernetStatistics =	cpu_to_le32(0), /* no statistics */
	.wMaxSegmentSize =	cpu_to_le16(ETH_FRAME_LEN),
	.wNumberMCFilters =	cpu_to_le16(0),
	.bNumberPowerFilters =	0,
};

#define NCAPS	(USB_CDC_NCM_NCAP_ETH_FILTER | USB_CDC_NCM_NCAP_CRC_MODE)

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static struct usb_cdc_ncm_desc ncm_desc = {
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	.bLength =		sizeof ncm_desc,
	.bDescriptorType =	USB_DT_CS_INTERFACE,
	.bDescriptorSubType =	USB_CDC_NCM_TYPE,

	.bcdNcmVersion =	cpu_to_le16(0x0100),
	/* can process SetEthernetPacketFilter */
	.bmNetworkCapabilities = NCAPS,
};

/* the default data interface has no endpoints ... */

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static struct usb_interface_descriptor ncm_data_nop_intf = {
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	.bLength =		sizeof ncm_data_nop_intf,
	.bDescriptorType =	USB_DT_INTERFACE,

	.bInterfaceNumber =	1,
	.bAlternateSetting =	0,
	.bNumEndpoints =	0,
	.bInterfaceClass =	USB_CLASS_CDC_DATA,
	.bInterfaceSubClass =	0,
	.bInterfaceProtocol =	USB_CDC_NCM_PROTO_NTB,
	/* .iInterface = DYNAMIC */
};

/* ... but the "real" data interface has two bulk endpoints */

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static struct usb_interface_descriptor ncm_data_intf = {
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	.bLength =		sizeof ncm_data_intf,
	.bDescriptorType =	USB_DT_INTERFACE,

	.bInterfaceNumber =	1,
	.bAlternateSetting =	1,
	.bNumEndpoints =	2,
	.bInterfaceClass =	USB_CLASS_CDC_DATA,
	.bInterfaceSubClass =	0,
	.bInterfaceProtocol =	USB_CDC_NCM_PROTO_NTB,
	/* .iInterface = DYNAMIC */
};

/* full speed support: */

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static struct usb_endpoint_descriptor fs_ncm_notify_desc = {
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	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_INT,
	.wMaxPacketSize =	cpu_to_le16(NCM_STATUS_BYTECOUNT),
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	.bInterval =		NCM_STATUS_INTERVAL_MS,
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};

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static struct usb_endpoint_descriptor fs_ncm_in_desc = {
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	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

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static struct usb_endpoint_descriptor fs_ncm_out_desc = {
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	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_OUT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

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static struct usb_descriptor_header *ncm_fs_function[] = {
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	(struct usb_descriptor_header *) &ncm_iad_desc,
	/* CDC NCM control descriptors */
	(struct usb_descriptor_header *) &ncm_control_intf,
	(struct usb_descriptor_header *) &ncm_header_desc,
	(struct usb_descriptor_header *) &ncm_union_desc,
	(struct usb_descriptor_header *) &ecm_desc,
	(struct usb_descriptor_header *) &ncm_desc,
	(struct usb_descriptor_header *) &fs_ncm_notify_desc,
	/* data interface, altsettings 0 and 1 */
	(struct usb_descriptor_header *) &ncm_data_nop_intf,
	(struct usb_descriptor_header *) &ncm_data_intf,
	(struct usb_descriptor_header *) &fs_ncm_in_desc,
	(struct usb_descriptor_header *) &fs_ncm_out_desc,
	NULL,
};

/* high speed support: */

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static struct usb_endpoint_descriptor hs_ncm_notify_desc = {
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	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_INT,
	.wMaxPacketSize =	cpu_to_le16(NCM_STATUS_BYTECOUNT),
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	.bInterval =		USB_MS_TO_HS_INTERVAL(NCM_STATUS_INTERVAL_MS),
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};
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static struct usb_endpoint_descriptor hs_ncm_in_desc = {
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	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(512),
};

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static struct usb_endpoint_descriptor hs_ncm_out_desc = {
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	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,

	.bEndpointAddress =	USB_DIR_OUT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(512),
};

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static struct usb_descriptor_header *ncm_hs_function[] = {
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	(struct usb_descriptor_header *) &ncm_iad_desc,
	/* CDC NCM control descriptors */
	(struct usb_descriptor_header *) &ncm_control_intf,
	(struct usb_descriptor_header *) &ncm_header_desc,
	(struct usb_descriptor_header *) &ncm_union_desc,
	(struct usb_descriptor_header *) &ecm_desc,
	(struct usb_descriptor_header *) &ncm_desc,
	(struct usb_descriptor_header *) &hs_ncm_notify_desc,
	/* data interface, altsettings 0 and 1 */
	(struct usb_descriptor_header *) &ncm_data_nop_intf,
	(struct usb_descriptor_header *) &ncm_data_intf,
	(struct usb_descriptor_header *) &hs_ncm_in_desc,
	(struct usb_descriptor_header *) &hs_ncm_out_desc,
	NULL,
};

/* string descriptors: */

#define STRING_CTRL_IDX	0
#define STRING_MAC_IDX	1
#define STRING_DATA_IDX	2
#define STRING_IAD_IDX	3

static struct usb_string ncm_string_defs[] = {
	[STRING_CTRL_IDX].s = "CDC Network Control Model (NCM)",
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	[STRING_MAC_IDX].s = "",
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	[STRING_DATA_IDX].s = "CDC Network Data",
	[STRING_IAD_IDX].s = "CDC NCM",
	{  } /* end of list */
};

static struct usb_gadget_strings ncm_string_table = {
	.language =		0x0409,	/* en-us */
	.strings =		ncm_string_defs,
};

static struct usb_gadget_strings *ncm_strings[] = {
	&ncm_string_table,
	NULL,
};

/*
 * Here are options for NCM Datagram Pointer table (NDP) parser.
 * There are 2 different formats: NDP16 and NDP32 in the spec (ch. 3),
 * in NDP16 offsets and sizes fields are 1 16bit word wide,
 * in NDP32 -- 2 16bit words wide. Also signatures are different.
 * To make the parser code the same, put the differences in the structure,
 * and switch pointers to the structures when the format is changed.
 */

struct ndp_parser_opts {
	u32		nth_sign;
	u32		ndp_sign;
	unsigned	nth_size;
	unsigned	ndp_size;
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	unsigned	dpe_size;
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	unsigned	ndplen_align;
	/* sizes in u16 units */
	unsigned	dgram_item_len; /* index or length */
	unsigned	block_length;
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	unsigned	ndp_index;
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	unsigned	reserved1;
	unsigned	reserved2;
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	unsigned	next_ndp_index;
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};

#define INIT_NDP16_OPTS {					\
		.nth_sign = USB_CDC_NCM_NTH16_SIGN,		\
		.ndp_sign = USB_CDC_NCM_NDP16_NOCRC_SIGN,	\
		.nth_size = sizeof(struct usb_cdc_ncm_nth16),	\
		.ndp_size = sizeof(struct usb_cdc_ncm_ndp16),	\
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		.dpe_size = sizeof(struct usb_cdc_ncm_dpe16),	\
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		.ndplen_align = 4,				\
		.dgram_item_len = 1,				\
		.block_length = 1,				\
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		.ndp_index = 1,					\
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		.reserved1 = 0,					\
		.reserved2 = 0,					\
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		.next_ndp_index = 1,				\
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	}


#define INIT_NDP32_OPTS {					\
		.nth_sign = USB_CDC_NCM_NTH32_SIGN,		\
		.ndp_sign = USB_CDC_NCM_NDP32_NOCRC_SIGN,	\
		.nth_size = sizeof(struct usb_cdc_ncm_nth32),	\
		.ndp_size = sizeof(struct usb_cdc_ncm_ndp32),	\
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		.dpe_size = sizeof(struct usb_cdc_ncm_dpe32),	\
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		.ndplen_align = 8,				\
		.dgram_item_len = 2,				\
		.block_length = 2,				\
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		.ndp_index = 2,					\
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		.reserved1 = 1,					\
		.reserved2 = 2,					\
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		.next_ndp_index = 2,				\
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	}

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static const struct ndp_parser_opts ndp16_opts = INIT_NDP16_OPTS;
static const struct ndp_parser_opts ndp32_opts = INIT_NDP32_OPTS;
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static inline void put_ncm(__le16 **p, unsigned size, unsigned val)
{
	switch (size) {
	case 1:
		put_unaligned_le16((u16)val, *p);
		break;
	case 2:
		put_unaligned_le32((u32)val, *p);

		break;
	default:
		BUG();
	}

	*p += size;
}

static inline unsigned get_ncm(__le16 **p, unsigned size)
{
	unsigned tmp;

	switch (size) {
	case 1:
		tmp = get_unaligned_le16(*p);
		break;
	case 2:
		tmp = get_unaligned_le32(*p);
		break;
	default:
		BUG();
	}

	*p += size;
	return tmp;
}

/*-------------------------------------------------------------------------*/

static inline void ncm_reset_values(struct f_ncm *ncm)
{
	ncm->parser_opts = &ndp16_opts;
	ncm->is_crc = false;
	ncm->port.cdc_filter = DEFAULT_FILTER;

	/* doesn't make sense for ncm, fixed size used */
	ncm->port.header_len = 0;

	ncm->port.fixed_out_len = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
	ncm->port.fixed_in_len = NTB_DEFAULT_IN_SIZE;
}

/*
 * Context: ncm->lock held
 */
static void ncm_do_notify(struct f_ncm *ncm)
{
	struct usb_request		*req = ncm->notify_req;
	struct usb_cdc_notification	*event;
	struct usb_composite_dev	*cdev = ncm->port.func.config->cdev;
	__le32				*data;
	int				status;

	/* notification already in flight? */
	if (!req)
		return;

	event = req->buf;
	switch (ncm->notify_state) {
	case NCM_NOTIFY_NONE:
		return;

	case NCM_NOTIFY_CONNECT:
		event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
		if (ncm->is_open)
			event->wValue = cpu_to_le16(1);
		else
			event->wValue = cpu_to_le16(0);
		event->wLength = 0;
		req->length = sizeof *event;

		DBG(cdev, "notify connect %s\n",
				ncm->is_open ? "true" : "false");
		ncm->notify_state = NCM_NOTIFY_NONE;
		break;

	case NCM_NOTIFY_SPEED:
		event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
		event->wValue = cpu_to_le16(0);
		event->wLength = cpu_to_le16(8);
		req->length = NCM_STATUS_BYTECOUNT;

		/* SPEED_CHANGE data is up/down speeds in bits/sec */
		data = req->buf + sizeof *event;
		data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));
		data[1] = data[0];

		DBG(cdev, "notify speed %d\n", ncm_bitrate(cdev->gadget));
		ncm->notify_state = NCM_NOTIFY_CONNECT;
		break;
	}
	event->bmRequestType = 0xA1;
	event->wIndex = cpu_to_le16(ncm->ctrl_id);

	ncm->notify_req = NULL;
	/*
	 * In double buffering if there is a space in FIFO,
	 * completion callback can be called right after the call,
	 * so unlocking
	 */
	spin_unlock(&ncm->lock);
	status = usb_ep_queue(ncm->notify, req, GFP_ATOMIC);
	spin_lock(&ncm->lock);
	if (status < 0) {
		ncm->notify_req = req;
		DBG(cdev, "notify --> %d\n", status);
	}
}

/*
 * Context: ncm->lock held
 */
static void ncm_notify(struct f_ncm *ncm)
{
	/*
	 * NOTE on most versions of Linux, host side cdc-ethernet
	 * won't listen for notifications until its netdevice opens.
	 * The first notification then sits in the FIFO for a long
	 * time, and the second one is queued.
	 *
	 * If ncm_notify() is called before the second (CONNECT)
	 * notification is sent, then it will reset to send the SPEED
	 * notificaion again (and again, and again), but it's not a problem
	 */
	ncm->notify_state = NCM_NOTIFY_SPEED;
	ncm_do_notify(ncm);
}

static void ncm_notify_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct f_ncm			*ncm = req->context;
	struct usb_composite_dev	*cdev = ncm->port.func.config->cdev;
	struct usb_cdc_notification	*event = req->buf;

	spin_lock(&ncm->lock);
	switch (req->status) {
	case 0:
		VDBG(cdev, "Notification %02x sent\n",
		     event->bNotificationType);
		break;
	case -ECONNRESET:
	case -ESHUTDOWN:
		ncm->notify_state = NCM_NOTIFY_NONE;
		break;
	default:
		DBG(cdev, "event %02x --> %d\n",
			event->bNotificationType, req->status);
		break;
	}
	ncm->notify_req = req;
	ncm_do_notify(ncm);
	spin_unlock(&ncm->lock);
}

static void ncm_ep0out_complete(struct usb_ep *ep, struct usb_request *req)
{
	/* now for SET_NTB_INPUT_SIZE only */
	unsigned		in_size;
	struct usb_function	*f = req->context;
	struct f_ncm		*ncm = func_to_ncm(f);
	struct usb_composite_dev *cdev = ep->driver_data;

	req->context = NULL;
	if (req->status || req->actual != req->length) {
		DBG(cdev, "Bad control-OUT transfer\n");
		goto invalid;
	}

	in_size = get_unaligned_le32(req->buf);
	if (in_size < USB_CDC_NCM_NTB_MIN_IN_SIZE ||
	    in_size > le32_to_cpu(ntb_parameters.dwNtbInMaxSize)) {
		DBG(cdev, "Got wrong INPUT SIZE (%d) from host\n", in_size);
		goto invalid;
	}

	ncm->port.fixed_in_len = in_size;
	VDBG(cdev, "Set NTB INPUT SIZE %d\n", in_size);
	return;

invalid:
	usb_ep_set_halt(ep);
	return;
}

static int ncm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
{
	struct f_ncm		*ncm = func_to_ncm(f);
	struct usb_composite_dev *cdev = f->config->cdev;
	struct usb_request	*req = cdev->req;
	int			value = -EOPNOTSUPP;
	u16			w_index = le16_to_cpu(ctrl->wIndex);
	u16			w_value = le16_to_cpu(ctrl->wValue);
	u16			w_length = le16_to_cpu(ctrl->wLength);

	/*
	 * composite driver infrastructure handles everything except
	 * CDC class messages; interface activation uses set_alt().
	 */
	switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
	case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
			| USB_CDC_SET_ETHERNET_PACKET_FILTER:
		/*
		 * see 6.2.30: no data, wIndex = interface,
		 * wValue = packet filter bitmap
		 */
		if (w_length != 0 || w_index != ncm->ctrl_id)
			goto invalid;
		DBG(cdev, "packet filter %02x\n", w_value);
		/*
		 * REVISIT locking of cdc_filter.  This assumes the UDC
		 * driver won't have a concurrent packet TX irq running on
		 * another CPU; or that if it does, this write is atomic...
		 */
		ncm->port.cdc_filter = w_value;
		value = 0;
		break;
	/*
	 * and optionally:
	 * case USB_CDC_SEND_ENCAPSULATED_COMMAND:
	 * case USB_CDC_GET_ENCAPSULATED_RESPONSE:
	 * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
	 * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
	 * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
	 * case USB_CDC_GET_ETHERNET_STATISTIC:
	 */

	case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
		| USB_CDC_GET_NTB_PARAMETERS:

		if (w_length == 0 || w_value != 0 || w_index != ncm->ctrl_id)
			goto invalid;
		value = w_length > sizeof ntb_parameters ?
			sizeof ntb_parameters : w_length;
		memcpy(req->buf, &ntb_parameters, value);
		VDBG(cdev, "Host asked NTB parameters\n");
		break;

	case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
		| USB_CDC_GET_NTB_INPUT_SIZE:

		if (w_length < 4 || w_value != 0 || w_index != ncm->ctrl_id)
			goto invalid;
		put_unaligned_le32(ncm->port.fixed_in_len, req->buf);
		value = 4;
		VDBG(cdev, "Host asked INPUT SIZE, sending %d\n",
		     ncm->port.fixed_in_len);
		break;

	case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
		| USB_CDC_SET_NTB_INPUT_SIZE:
	{
		if (w_length != 4 || w_value != 0 || w_index != ncm->ctrl_id)
			goto invalid;
		req->complete = ncm_ep0out_complete;
		req->length = w_length;
		req->context = f;

		value = req->length;
		break;
	}

	case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
		| USB_CDC_GET_NTB_FORMAT:
	{
		uint16_t format;

		if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id)
			goto invalid;
		format = (ncm->parser_opts == &ndp16_opts) ? 0x0000 : 0x0001;
		put_unaligned_le16(format, req->buf);
		value = 2;
		VDBG(cdev, "Host asked NTB FORMAT, sending %d\n", format);
		break;
	}

	case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
		| USB_CDC_SET_NTB_FORMAT:
	{
		if (w_length != 0 || w_index != ncm->ctrl_id)
			goto invalid;
		switch (w_value) {
		case 0x0000:
			ncm->parser_opts = &ndp16_opts;
			DBG(cdev, "NCM16 selected\n");
			break;
		case 0x0001:
			ncm->parser_opts = &ndp32_opts;
			DBG(cdev, "NCM32 selected\n");
			break;
		default:
			goto invalid;
		}
		value = 0;
		break;
	}
	case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
		| USB_CDC_GET_CRC_MODE:
	{
		uint16_t is_crc;

		if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id)
			goto invalid;
		is_crc = ncm->is_crc ? 0x0001 : 0x0000;
		put_unaligned_le16(is_crc, req->buf);
		value = 2;
		VDBG(cdev, "Host asked CRC MODE, sending %d\n", is_crc);
		break;
	}

	case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
		| USB_CDC_SET_CRC_MODE:
	{
		int ndp_hdr_crc = 0;

		if (w_length != 0 || w_index != ncm->ctrl_id)
			goto invalid;
		switch (w_value) {
		case 0x0000:
			ncm->is_crc = false;
			ndp_hdr_crc = NCM_NDP_HDR_NOCRC;
			DBG(cdev, "non-CRC mode selected\n");
			break;
		case 0x0001:
			ncm->is_crc = true;
			ndp_hdr_crc = NCM_NDP_HDR_CRC;
			DBG(cdev, "CRC mode selected\n");
			break;
		default:
			goto invalid;
		}
759
		ncm->ndp_sign = ncm->parser_opts->ndp_sign | ndp_hdr_crc;
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		value = 0;
		break;
	}

	/* and disabled in ncm descriptor: */
	/* case USB_CDC_GET_NET_ADDRESS: */
	/* case USB_CDC_SET_NET_ADDRESS: */
	/* case USB_CDC_GET_MAX_DATAGRAM_SIZE: */
	/* case USB_CDC_SET_MAX_DATAGRAM_SIZE: */

	default:
invalid:
		DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
			ctrl->bRequestType, ctrl->bRequest,
			w_value, w_index, w_length);
	}

	/* respond with data transfer or status phase? */
	if (value >= 0) {
		DBG(cdev, "ncm req%02x.%02x v%04x i%04x l%d\n",
			ctrl->bRequestType, ctrl->bRequest,
			w_value, w_index, w_length);
		req->zero = 0;
		req->length = value;
		value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
		if (value < 0)
			ERROR(cdev, "ncm req %02x.%02x response err %d\n",
					ctrl->bRequestType, ctrl->bRequest,
					value);
	}

	/* device either stalls (value < 0) or reports success */
	return value;
}


static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
	struct f_ncm		*ncm = func_to_ncm(f);
	struct usb_composite_dev *cdev = f->config->cdev;

	/* Control interface has only altsetting 0 */
	if (intf == ncm->ctrl_id) {
		if (alt != 0)
			goto fail;

		if (ncm->notify->driver_data) {
			DBG(cdev, "reset ncm control %d\n", intf);
			usb_ep_disable(ncm->notify);
809 810 811
		}

		if (!(ncm->notify->desc)) {
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			DBG(cdev, "init ncm ctrl %d\n", intf);
813 814
			if (config_ep_by_speed(cdev->gadget, f, ncm->notify))
				goto fail;
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		}
816
		usb_ep_enable(ncm->notify);
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		ncm->notify->driver_data = ncm;

	/* Data interface has two altsettings, 0 and 1 */
	} else if (intf == ncm->data_id) {
		if (alt > 1)
			goto fail;

		if (ncm->port.in_ep->driver_data) {
			DBG(cdev, "reset ncm\n");
826 827
			ncm->timer_stopping = true;
			ncm->netdev = NULL;
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			gether_disconnect(&ncm->port);
			ncm_reset_values(ncm);
		}

		/*
		 * CDC Network only sends data in non-default altsettings.
		 * Changing altsettings resets filters, statistics, etc.
		 */
		if (alt == 1) {
			struct net_device	*net;

839 840
			if (!ncm->port.in_ep->desc ||
			    !ncm->port.out_ep->desc) {
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				DBG(cdev, "init ncm\n");
842 843 844 845 846 847 848 849
				if (config_ep_by_speed(cdev->gadget, f,
						       ncm->port.in_ep) ||
				    config_ep_by_speed(cdev->gadget, f,
						       ncm->port.out_ep)) {
					ncm->port.in_ep->desc = NULL;
					ncm->port.out_ep->desc = NULL;
					goto fail;
				}
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			}

			/* TODO */
			/* Enable zlps by default for NCM conformance;
			 * override for musb_hdrc (avoids txdma ovhead)
			 */
			ncm->port.is_zlp_ok = !(
				gadget_is_musbhdrc(cdev->gadget)
				);
			ncm->port.cdc_filter = DEFAULT_FILTER;
			DBG(cdev, "activate ncm\n");
			net = gether_connect(&ncm->port);
			if (IS_ERR(net))
				return PTR_ERR(net);
864 865
			ncm->netdev = net;
			ncm->timer_stopping = false;
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		}

		spin_lock(&ncm->lock);
		ncm_notify(ncm);
		spin_unlock(&ncm->lock);
	} else
		goto fail;

	return 0;
fail:
	return -EINVAL;
}

/*
 * Because the data interface supports multiple altsettings,
 * this NCM function *MUST* implement a get_alt() method.
 */
static int ncm_get_alt(struct usb_function *f, unsigned intf)
{
	struct f_ncm		*ncm = func_to_ncm(f);

	if (intf == ncm->ctrl_id)
		return 0;
	return ncm->port.in_ep->driver_data ? 1 : 0;
}

892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
static struct sk_buff *package_for_tx(struct f_ncm *ncm)
{
	__le16		*ntb_iter;
	struct sk_buff	*skb2 = NULL;
	unsigned	ndp_pad;
	unsigned	ndp_index;
	unsigned	new_len;

	const struct ndp_parser_opts *opts = ncm->parser_opts;
	const int ndp_align = le16_to_cpu(ntb_parameters.wNdpInAlignment);
	const int dgram_idx_len = 2 * 2 * opts->dgram_item_len;

	/* Stop the timer */
	hrtimer_try_to_cancel(&ncm->task_timer);

	ndp_pad = ALIGN(ncm->skb_tx_data->len, ndp_align) -
			ncm->skb_tx_data->len;
	ndp_index = ncm->skb_tx_data->len + ndp_pad;
	new_len = ndp_index + dgram_idx_len + ncm->skb_tx_ndp->len;

	/* Set the final BlockLength and wNdpIndex */
	ntb_iter = (void *) ncm->skb_tx_data->data;
	/* Increment pointer to BlockLength */
	ntb_iter += 2 + 1 + 1;
	put_ncm(&ntb_iter, opts->block_length, new_len);
	put_ncm(&ntb_iter, opts->ndp_index, ndp_index);

	/* Set the final NDP wLength */
	new_len = opts->ndp_size +
			(ncm->ndp_dgram_count * dgram_idx_len);
	ncm->ndp_dgram_count = 0;
	/* Increment from start to wLength */
	ntb_iter = (void *) ncm->skb_tx_ndp->data;
	ntb_iter += 2;
	put_unaligned_le16(new_len, ntb_iter);

	/* Merge the skbs */
	swap(skb2, ncm->skb_tx_data);
	if (ncm->skb_tx_data) {
		dev_kfree_skb_any(ncm->skb_tx_data);
		ncm->skb_tx_data = NULL;
	}

	/* Insert NDP alignment. */
	ntb_iter = (void *) skb_put(skb2, ndp_pad);
	memset(ntb_iter, 0, ndp_pad);

	/* Copy NTB across. */
	ntb_iter = (void *) skb_put(skb2, ncm->skb_tx_ndp->len);
	memcpy(ntb_iter, ncm->skb_tx_ndp->data, ncm->skb_tx_ndp->len);
	dev_kfree_skb_any(ncm->skb_tx_ndp);
	ncm->skb_tx_ndp = NULL;

	/* Insert zero'd datagram. */
	ntb_iter = (void *) skb_put(skb2, dgram_idx_len);
	memset(ntb_iter, 0, dgram_idx_len);

	return skb2;
}

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static struct sk_buff *ncm_wrap_ntb(struct gether *port,
				    struct sk_buff *skb)
{
	struct f_ncm	*ncm = func_to_ncm(&port->func);
956
	struct sk_buff	*skb2 = NULL;
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	int		ncb_len = 0;
958 959 960 961
	__le16		*ntb_data;
	__le16		*ntb_ndp;
	int		dgram_pad;

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	unsigned	max_size = ncm->port.fixed_in_len;
963
	const struct ndp_parser_opts *opts = ncm->parser_opts;
964 965 966 967
	const int ndp_align = le16_to_cpu(ntb_parameters.wNdpInAlignment);
	const int div = le16_to_cpu(ntb_parameters.wNdpInDivisor);
	const int rem = le16_to_cpu(ntb_parameters.wNdpInPayloadRemainder);
	const int dgram_idx_len = 2 * 2 * opts->dgram_item_len;
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969
	if (!skb && !ncm->skb_tx_data)
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		return NULL;

972 973 974 975 976 977 978 979 980 981 982 983
	if (skb) {
		/* Add the CRC if required up front */
		if (ncm->is_crc) {
			uint32_t	crc;
			__le16		*crc_pos;

			crc = ~crc32_le(~0,
					skb->data,
					skb->len);
			crc_pos = (void *) skb_put(skb, sizeof(uint32_t));
			put_unaligned_le32(crc, crc_pos);
		}
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985 986 987 988 989 990 991 992 993 994 995 996 997 998 999
		/* If the new skb is too big for the current NCM NTB then
		 * set the current stored skb to be sent now and clear it
		 * ready for new data.
		 * NOTE: Assume maximum align for speed of calculation.
		 */
		if (ncm->skb_tx_data
		    && (ncm->ndp_dgram_count >= TX_MAX_NUM_DPE
		    || (ncm->skb_tx_data->len +
		    div + rem + skb->len +
		    ncm->skb_tx_ndp->len + ndp_align + (2 * dgram_idx_len))
		    > max_size)) {
			skb2 = package_for_tx(ncm);
			if (!skb2)
				goto err;
		}
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1001 1002 1003 1004
		if (!ncm->skb_tx_data) {
			ncb_len = opts->nth_size;
			dgram_pad = ALIGN(ncb_len, div) + rem - ncb_len;
			ncb_len += dgram_pad;
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1006 1007 1008 1009
			/* Create a new skb for the NTH and datagrams. */
			ncm->skb_tx_data = alloc_skb(max_size, GFP_ATOMIC);
			if (!ncm->skb_tx_data)
				goto err;
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1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
			ntb_data = (void *) skb_put(ncm->skb_tx_data, ncb_len);
			memset(ntb_data, 0, ncb_len);
			/* dwSignature */
			put_unaligned_le32(opts->nth_sign, ntb_data);
			ntb_data += 2;
			/* wHeaderLength */
			put_unaligned_le16(opts->nth_size, ntb_data++);

			/* Allocate an skb for storing the NDP,
			 * TX_MAX_NUM_DPE should easily suffice for a
			 * 16k packet.
			 */
			ncm->skb_tx_ndp = alloc_skb((int)(opts->ndp_size
						    + opts->dpe_size
						    * TX_MAX_NUM_DPE),
						    GFP_ATOMIC);
			if (!ncm->skb_tx_ndp)
				goto err;
			ntb_ndp = (void *) skb_put(ncm->skb_tx_ndp,
						    opts->ndp_size);
			memset(ntb_ndp, 0, ncb_len);
			/* dwSignature */
			put_unaligned_le32(ncm->ndp_sign, ntb_ndp);
			ntb_ndp += 2;
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1035

1036 1037
			/* There is always a zeroed entry */
			ncm->ndp_dgram_count = 1;
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1038

1039 1040
			/* Note: we skip opts->next_ndp_index */
		}
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Yauheni Kaliuta 已提交
1041

1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
		/* Delay the timer. */
		hrtimer_start(&ncm->task_timer,
			      ktime_set(0, TX_TIMEOUT_NSECS),
			      HRTIMER_MODE_REL);

		/* Add the datagram position entries */
		ntb_ndp = (void *) skb_put(ncm->skb_tx_ndp, dgram_idx_len);
		memset(ntb_ndp, 0, dgram_idx_len);

		ncb_len = ncm->skb_tx_data->len;
		dgram_pad = ALIGN(ncb_len, div) + rem - ncb_len;
		ncb_len += dgram_pad;

		/* (d)wDatagramIndex */
		put_ncm(&ntb_ndp, opts->dgram_item_len, ncb_len);
		/* (d)wDatagramLength */
		put_ncm(&ntb_ndp, opts->dgram_item_len, skb->len);
		ncm->ndp_dgram_count++;

		/* Add the new data to the skb */
		ntb_data = (void *) skb_put(ncm->skb_tx_data, dgram_pad);
		memset(ntb_data, 0, dgram_pad);
		ntb_data = (void *) skb_put(ncm->skb_tx_data, skb->len);
		memcpy(ntb_data, skb->data, skb->len);
		dev_kfree_skb_any(skb);
		skb = NULL;
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1069 1070 1071 1072 1073
	} else if (ncm->skb_tx_data && ncm->timer_force_tx) {
		/* If the tx was requested because of a timeout then send */
		skb2 = package_for_tx(ncm);
		if (!skb2)
			goto err;
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	}

1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
	return skb2;

err:
	ncm->netdev->stats.tx_dropped++;

	if (skb)
		dev_kfree_skb_any(skb);
	if (ncm->skb_tx_data)
		dev_kfree_skb_any(ncm->skb_tx_data);
	if (ncm->skb_tx_ndp)
		dev_kfree_skb_any(ncm->skb_tx_ndp);

	return NULL;
}

/*
 * This transmits the NTB if there are frames waiting.
 */
static void ncm_tx_tasklet(unsigned long data)
{
	struct f_ncm	*ncm = (void *)data;
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1098 1099 1100 1101 1102 1103
	if (ncm->timer_stopping)
		return;

	/* Only send if data is available. */
	if (ncm->skb_tx_data) {
		ncm->timer_force_tx = true;
1104 1105 1106 1107 1108 1109 1110 1111 1112

		/* XXX This allowance of a NULL skb argument to ndo_start_xmit
		 * XXX is not sane.  The gadget layer should be redesigned so
		 * XXX that the dev->wrap() invocations to build SKBs is transparent
		 * XXX and performed in some way outside of the ndo_start_xmit
		 * XXX interface.
		 */
		ncm->netdev->netdev_ops->ndo_start_xmit(NULL, ncm->netdev);

1113 1114 1115
		ncm->timer_force_tx = false;
	}
}
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1117 1118 1119 1120 1121 1122 1123 1124 1125
/*
 * The transmit should only be run if no skb data has been sent
 * for a certain duration.
 */
static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data)
{
	struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer);
	tasklet_schedule(&ncm->tx_tasklet);
	return HRTIMER_NORESTART;
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1126 1127 1128 1129 1130 1131 1132 1133 1134
}

static int ncm_unwrap_ntb(struct gether *port,
			  struct sk_buff *skb,
			  struct sk_buff_head *list)
{
	struct f_ncm	*ncm = func_to_ncm(&port->func);
	__le16		*tmp = (void *) skb->data;
	unsigned	index, index2;
1135
	int		ndp_index;
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1136 1137 1138 1139 1140
	unsigned	dg_len, dg_len2;
	unsigned	ndp_len;
	struct sk_buff	*skb2;
	int		ret = -EINVAL;
	unsigned	max_size = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
1141
	const struct ndp_parser_opts *opts = ncm->parser_opts;
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1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
	unsigned	crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
	int		dgram_counter;

	/* dwSignature */
	if (get_unaligned_le32(tmp) != opts->nth_sign) {
		INFO(port->func.config->cdev, "Wrong NTH SIGN, skblen %d\n",
			skb->len);
		print_hex_dump(KERN_INFO, "HEAD:", DUMP_PREFIX_ADDRESS, 32, 1,
			       skb->data, 32, false);

		goto err;
	}
	tmp += 2;
	/* wHeaderLength */
	if (get_unaligned_le16(tmp++) != opts->nth_size) {
		INFO(port->func.config->cdev, "Wrong NTB headersize\n");
		goto err;
	}
	tmp++; /* skip wSequence */

	/* (d)wBlockLength */
	if (get_ncm(&tmp, opts->block_length) > max_size) {
		INFO(port->func.config->cdev, "OUT size exceeded\n");
		goto err;
	}

1168
	ndp_index = get_ncm(&tmp, opts->ndp_index);
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1169

1170
	/* Run through all the NDP's in the NTB */
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	do {
1172 1173 1174 1175 1176
		/* NCM 3.2 */
		if (((ndp_index % 4) != 0) &&
				(ndp_index < opts->nth_size)) {
			INFO(port->func.config->cdev, "Bad index: %#X\n",
			     ndp_index);
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			goto err;
		}
1179 1180 1181 1182 1183 1184

		/* walk through NDP */
		tmp = (void *)(skb->data + ndp_index);
		if (get_unaligned_le32(tmp) != ncm->ndp_sign) {
			INFO(port->func.config->cdev, "Wrong NDP SIGN\n");
			goto err;
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		}
1186
		tmp += 2;
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1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
		ndp_len = get_unaligned_le16(tmp++);
		/*
		 * NCM 3.3.1
		 * entry is 2 items
		 * item size is 16/32 bits, opts->dgram_item_len * 2 bytes
		 * minimal: struct usb_cdc_ncm_ndpX + normal entry + zero entry
		 * Each entry is a dgram index and a dgram length.
		 */
		if ((ndp_len < opts->ndp_size
				+ 2 * 2 * (opts->dgram_item_len * 2))
				|| (ndp_len % opts->ndplen_align != 0)) {
			INFO(port->func.config->cdev, "Bad NDP length: %#X\n",
			     ndp_len);
			goto err;
		}
		tmp += opts->reserved1;
		/* Check for another NDP (d)wNextNdpIndex */
1205
		ndp_index = get_ncm(&tmp, opts->next_ndp_index);
1206 1207 1208
		tmp += opts->reserved2;

		ndp_len -= opts->ndp_size;
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		index2 = get_ncm(&tmp, opts->dgram_item_len);
		dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238
		dgram_counter = 0;

		do {
			index = index2;
			dg_len = dg_len2;
			if (dg_len < 14 + crc_len) { /* ethernet hdr + crc */
				INFO(port->func.config->cdev,
				     "Bad dgram length: %#X\n", dg_len);
				goto err;
			}
			if (ncm->is_crc) {
				uint32_t crc, crc2;

				crc = get_unaligned_le32(skb->data +
							 index + dg_len -
							 crc_len);
				crc2 = ~crc32_le(~0,
						 skb->data + index,
						 dg_len - crc_len);
				if (crc != crc2) {
					INFO(port->func.config->cdev,
					     "Bad CRC\n");
					goto err;
				}
			}

			index2 = get_ncm(&tmp, opts->dgram_item_len);
			dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
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1240 1241 1242 1243 1244 1245
			/*
			 * Copy the data into a new skb.
			 * This ensures the truesize is correct
			 */
			skb2 = netdev_alloc_skb_ip_align(ncm->netdev,
							 dg_len - crc_len);
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1246 1247
			if (skb2 == NULL)
				goto err;
1248 1249
			memcpy(skb_put(skb2, dg_len - crc_len),
			       skb->data + index, dg_len - crc_len);
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1250

1251
			skb_queue_tail(list, skb2);
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1252

1253
			ndp_len -= 2 * (opts->dgram_item_len * 2);
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1254

1255
			dgram_counter++;
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1256

1257 1258 1259 1260 1261 1262
			if (index2 == 0 || dg_len2 == 0)
				break;
		} while (ndp_len > 2 * (opts->dgram_item_len * 2));
	} while (ndp_index);

	dev_kfree_skb_any(skb);
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1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279

	VDBG(port->func.config->cdev,
	     "Parsed NTB with %d frames\n", dgram_counter);
	return 0;
err:
	skb_queue_purge(list);
	dev_kfree_skb_any(skb);
	return ret;
}

static void ncm_disable(struct usb_function *f)
{
	struct f_ncm		*ncm = func_to_ncm(f);
	struct usb_composite_dev *cdev = f->config->cdev;

	DBG(cdev, "ncm deactivated\n");

1280 1281 1282
	if (ncm->port.in_ep->driver_data) {
		ncm->timer_stopping = true;
		ncm->netdev = NULL;
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		gether_disconnect(&ncm->port);
1284
	}
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	if (ncm->notify->driver_data) {
		usb_ep_disable(ncm->notify);
		ncm->notify->driver_data = NULL;
1289
		ncm->notify->desc = NULL;
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1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340
	}
}

/*-------------------------------------------------------------------------*/

/*
 * Callbacks let us notify the host about connect/disconnect when the
 * net device is opened or closed.
 *
 * For testing, note that link states on this side include both opened
 * and closed variants of:
 *
 *   - disconnected/unconfigured
 *   - configured but inactive (data alt 0)
 *   - configured and active (data alt 1)
 *
 * Each needs to be tested with unplug, rmmod, SET_CONFIGURATION, and
 * SET_INTERFACE (altsetting).  Remember also that "configured" doesn't
 * imply the host is actually polling the notification endpoint, and
 * likewise that "active" doesn't imply it's actually using the data
 * endpoints for traffic.
 */

static void ncm_open(struct gether *geth)
{
	struct f_ncm		*ncm = func_to_ncm(&geth->func);

	DBG(ncm->port.func.config->cdev, "%s\n", __func__);

	spin_lock(&ncm->lock);
	ncm->is_open = true;
	ncm_notify(ncm);
	spin_unlock(&ncm->lock);
}

static void ncm_close(struct gether *geth)
{
	struct f_ncm		*ncm = func_to_ncm(&geth->func);

	DBG(ncm->port.func.config->cdev, "%s\n", __func__);

	spin_lock(&ncm->lock);
	ncm->is_open = false;
	ncm_notify(ncm);
	spin_unlock(&ncm->lock);
}

/*-------------------------------------------------------------------------*/

/* ethernet function driver setup/binding */

1341
static int ncm_bind(struct usb_configuration *c, struct usb_function *f)
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{
	struct usb_composite_dev *cdev = c->cdev;
	struct f_ncm		*ncm = func_to_ncm(f);
1345
	struct usb_string	*us;
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	int			status;
	struct usb_ep		*ep;
1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
	struct f_ncm_opts	*ncm_opts;

	if (!can_support_ecm(cdev->gadget))
		return -EINVAL;

	ncm_opts = container_of(f->fi, struct f_ncm_opts, func_inst);
	/*
	 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
	 * configurations are bound in sequence with list_for_each_entry,
	 * in each configuration its functions are bound in sequence
	 * with list_for_each_entry, so we assume no race condition
	 * with regard to ncm_opts->bound access
	 */
	if (!ncm_opts->bound) {
1362
		mutex_lock(&ncm_opts->lock);
1363 1364
		gether_set_gadget(ncm_opts->net, cdev->gadget);
		status = gether_register_netdev(ncm_opts->net);
1365
		mutex_unlock(&ncm_opts->lock);
1366 1367 1368 1369
		if (status)
			return status;
		ncm_opts->bound = true;
	}
1370 1371 1372 1373 1374 1375 1376 1377 1378
	us = usb_gstrings_attach(cdev, ncm_strings,
				 ARRAY_SIZE(ncm_string_defs));
	if (IS_ERR(us))
		return PTR_ERR(us);
	ncm_control_intf.iInterface = us[STRING_CTRL_IDX].id;
	ncm_data_nop_intf.iInterface = us[STRING_DATA_IDX].id;
	ncm_data_intf.iInterface = us[STRING_DATA_IDX].id;
	ecm_desc.iMACAddress = us[STRING_MAC_IDX].id;
	ncm_iad_desc.iFunction = us[STRING_IAD_IDX].id;
1379

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1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
	/* allocate instance-specific interface IDs */
	status = usb_interface_id(c, f);
	if (status < 0)
		goto fail;
	ncm->ctrl_id = status;
	ncm_iad_desc.bFirstInterface = status;

	ncm_control_intf.bInterfaceNumber = status;
	ncm_union_desc.bMasterInterface0 = status;

	status = usb_interface_id(c, f);
	if (status < 0)
		goto fail;
	ncm->data_id = status;

	ncm_data_nop_intf.bInterfaceNumber = status;
	ncm_data_intf.bInterfaceNumber = status;
	ncm_union_desc.bSlaveInterface0 = status;

	status = -ENODEV;

	/* allocate instance-specific endpoints */
	ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_in_desc);
	if (!ep)
		goto fail;
	ncm->port.in_ep = ep;
	ep->driver_data = cdev;	/* claim */

	ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_out_desc);
	if (!ep)
		goto fail;
	ncm->port.out_ep = ep;
	ep->driver_data = cdev;	/* claim */

	ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_notify_desc);
	if (!ep)
		goto fail;
	ncm->notify = ep;
	ep->driver_data = cdev;	/* claim */

	status = -ENOMEM;

	/* allocate notification request and buffer */
	ncm->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
	if (!ncm->notify_req)
		goto fail;
	ncm->notify_req->buf = kmalloc(NCM_STATUS_BYTECOUNT, GFP_KERNEL);
	if (!ncm->notify_req->buf)
		goto fail;
	ncm->notify_req->context = ncm;
	ncm->notify_req->complete = ncm_notify_complete;

	/*
	 * support all relevant hardware speeds... we expect that when
	 * hardware is dual speed, all bulk-capable endpoints work at
	 * both speeds
	 */
1437 1438 1439 1440
	hs_ncm_in_desc.bEndpointAddress = fs_ncm_in_desc.bEndpointAddress;
	hs_ncm_out_desc.bEndpointAddress = fs_ncm_out_desc.bEndpointAddress;
	hs_ncm_notify_desc.bEndpointAddress =
		fs_ncm_notify_desc.bEndpointAddress;
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1442 1443
	status = usb_assign_descriptors(f, ncm_fs_function, ncm_hs_function,
			NULL);
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	/*
	 * NOTE:  all that is done without knowing or caring about
	 * the network link ... which is unavailable to this code
	 * until we're activated via set_alt().
	 */

	ncm->port.open = ncm_open;
	ncm->port.close = ncm_close;

1453 1454 1455 1456
	tasklet_init(&ncm->tx_tasklet, ncm_tx_tasklet, (unsigned long) ncm);
	hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	ncm->task_timer.function = ncm_tx_timeout;

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1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471
	DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n",
			gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
			ncm->port.in_ep->name, ncm->port.out_ep->name,
			ncm->notify->name);
	return 0;

fail:
	if (ncm->notify_req) {
		kfree(ncm->notify_req->buf);
		usb_ep_free_request(ncm->notify, ncm->notify_req);
	}

	/* we might as well release our claims on endpoints */
	if (ncm->notify)
		ncm->notify->driver_data = NULL;
1472
	if (ncm->port.out_ep)
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		ncm->port.out_ep->driver_data = NULL;
1474
	if (ncm->port.in_ep)
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1475 1476 1477 1478 1479 1480 1481
		ncm->port.in_ep->driver_data = NULL;

	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);

	return status;
}

1482 1483 1484 1485 1486 1487
static inline struct f_ncm_opts *to_f_ncm_opts(struct config_item *item)
{
	return container_of(to_config_group(item), struct f_ncm_opts,
			    func_inst.group);
}

1488 1489
/* f_ncm_item_ops */
USB_ETHERNET_CONFIGFS_ITEM(ncm);
1490

1491 1492
/* f_ncm_opts_dev_addr */
USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(ncm);
1493

1494 1495
/* f_ncm_opts_host_addr */
USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(ncm);
1496

1497 1498
/* f_ncm_opts_qmult */
USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(ncm);
1499

1500 1501
/* f_ncm_opts_ifname */
USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(ncm);
1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516

static struct configfs_attribute *ncm_attrs[] = {
	&f_ncm_opts_dev_addr.attr,
	&f_ncm_opts_host_addr.attr,
	&f_ncm_opts_qmult.attr,
	&f_ncm_opts_ifname.attr,
	NULL,
};

static struct config_item_type ncm_func_type = {
	.ct_item_ops	= &ncm_item_ops,
	.ct_attrs	= ncm_attrs,
	.ct_owner	= THIS_MODULE,
};

1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535
static void ncm_free_inst(struct usb_function_instance *f)
{
	struct f_ncm_opts *opts;

	opts = container_of(f, struct f_ncm_opts, func_inst);
	if (opts->bound)
		gether_cleanup(netdev_priv(opts->net));
	else
		free_netdev(opts->net);
	kfree(opts);
}

static struct usb_function_instance *ncm_alloc_inst(void)
{
	struct f_ncm_opts *opts;

	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
	if (!opts)
		return ERR_PTR(-ENOMEM);
1536
	mutex_init(&opts->lock);
1537 1538
	opts->func_inst.free_func_inst = ncm_free_inst;
	opts->net = gether_setup_default();
1539 1540 1541 1542 1543
	if (IS_ERR(opts->net)) {
		struct net_device *net = opts->net;
		kfree(opts);
		return ERR_CAST(net);
	}
1544

1545 1546
	config_group_init_type_name(&opts->func_inst.group, "", &ncm_func_type);

1547 1548 1549 1550 1551 1552
	return &opts->func_inst;
}

static void ncm_free(struct usb_function *f)
{
	struct f_ncm *ncm;
1553
	struct f_ncm_opts *opts;
1554 1555

	ncm = func_to_ncm(f);
1556
	opts = container_of(f->fi, struct f_ncm_opts, func_inst);
1557
	kfree(ncm);
1558 1559 1560
	mutex_lock(&opts->lock);
	opts->refcnt--;
	mutex_unlock(&opts->lock);
1561 1562 1563 1564 1565 1566 1567 1568
}

static void ncm_unbind(struct usb_configuration *c, struct usb_function *f)
{
	struct f_ncm *ncm = func_to_ncm(f);

	DBG(c->cdev, "ncm unbind\n");

1569 1570 1571 1572
	hrtimer_cancel(&ncm->task_timer);
	tasklet_kill(&ncm->tx_tasklet);

	ncm_string_defs[0].id = 0;
1573 1574 1575 1576 1577 1578
	usb_free_all_descriptors(f);

	kfree(ncm->notify_req->buf);
	usb_ep_free_request(ncm->notify, ncm->notify_req);
}

1579
static struct usb_function *ncm_alloc(struct usb_function_instance *fi)
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
{
	struct f_ncm		*ncm;
	struct f_ncm_opts	*opts;
	int status;

	/* allocate and initialize one new instance */
	ncm = kzalloc(sizeof(*ncm), GFP_KERNEL);
	if (!ncm)
		return ERR_PTR(-ENOMEM);

	opts = container_of(fi, struct f_ncm_opts, func_inst);
1591 1592
	mutex_lock(&opts->lock);
	opts->refcnt++;
1593 1594 1595 1596 1597 1598

	/* export host's Ethernet address in CDC format */
	status = gether_get_host_addr_cdc(opts->net, ncm->ethaddr,
				      sizeof(ncm->ethaddr));
	if (status < 12) { /* strlen("01234567890a") */
		kfree(ncm);
1599
		mutex_unlock(&opts->lock);
1600 1601 1602 1603 1604 1605 1606
		return ERR_PTR(-EINVAL);
	}
	ncm_string_defs[STRING_MAC_IDX].s = ncm->ethaddr;

	spin_lock_init(&ncm->lock);
	ncm_reset_values(ncm);
	ncm->port.ioport = netdev_priv(opts->net);
1607
	mutex_unlock(&opts->lock);
1608
	ncm->port.is_fixed = true;
1609
	ncm->port.supports_multi_frame = true;
1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629

	ncm->port.func.name = "cdc_network";
	/* descriptors are per-instance copies */
	ncm->port.func.bind = ncm_bind;
	ncm->port.func.unbind = ncm_unbind;
	ncm->port.func.set_alt = ncm_set_alt;
	ncm->port.func.get_alt = ncm_get_alt;
	ncm->port.func.setup = ncm_setup;
	ncm->port.func.disable = ncm_disable;
	ncm->port.func.free_func = ncm_free;

	ncm->port.wrap = ncm_wrap_ntb;
	ncm->port.unwrap = ncm_unwrap_ntb;

	return &ncm->port.func;
}

DECLARE_USB_FUNCTION_INIT(ncm, ncm_alloc_inst, ncm_alloc);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Yauheni Kaliuta");