drivers/usb/usbip/usbip_common.h - kernel/quantenna - Git at Google

 /*
  * Copyright (C) 2003-2008 Takahiro Hirofuchi
  * Copyright (C) 2015-2016 Samsung Electronics
  *               Krzysztof Opasiak <k.opasiak@samsung.com>
  *
  * This 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 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.
  */

 #ifndef __USBIP_COMMON_H
 #define __USBIP_COMMON_H

 #include <linux/compiler.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
 #include <linux/net.h>
 #include <linux/printk.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/usb.h>
 #include <linux/wait.h>
 #include <uapi/linux/usbip.h>

 #define USBIP_VERSION "1.0.0"

 #undef pr_fmt

 #ifdef DEBUG
 #define pr_fmt(fmt)     KBUILD_MODNAME ": %s:%d: " fmt, __func__, __LINE__
 #else
 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
 #endif

 enum {
 	usbip_debug_xmit	= (1 << 0),
 	usbip_debug_sysfs	= (1 << 1),
 	usbip_debug_urb		= (1 << 2),
 	usbip_debug_eh		= (1 << 3),

 	usbip_debug_stub_cmp	= (1 << 8),
 	usbip_debug_stub_dev	= (1 << 9),
 	usbip_debug_stub_rx	= (1 << 10),
 	usbip_debug_stub_tx	= (1 << 11),

 	usbip_debug_vhci_rh	= (1 << 8),
 	usbip_debug_vhci_hc	= (1 << 9),
 	usbip_debug_vhci_rx	= (1 << 10),
 	usbip_debug_vhci_tx	= (1 << 11),
 	usbip_debug_vhci_sysfs  = (1 << 12)
 };

 #define usbip_dbg_flag_xmit	(usbip_debug_flag & usbip_debug_xmit)
 #define usbip_dbg_flag_vhci_rh	(usbip_debug_flag & usbip_debug_vhci_rh)
 #define usbip_dbg_flag_vhci_hc	(usbip_debug_flag & usbip_debug_vhci_hc)
 #define usbip_dbg_flag_vhci_rx	(usbip_debug_flag & usbip_debug_vhci_rx)
 #define usbip_dbg_flag_vhci_tx	(usbip_debug_flag & usbip_debug_vhci_tx)
 #define usbip_dbg_flag_stub_rx	(usbip_debug_flag & usbip_debug_stub_rx)
 #define usbip_dbg_flag_stub_tx	(usbip_debug_flag & usbip_debug_stub_tx)
 #define usbip_dbg_flag_vhci_sysfs  (usbip_debug_flag & usbip_debug_vhci_sysfs)

 extern unsigned long usbip_debug_flag;
 extern struct device_attribute dev_attr_usbip_debug;

 #define usbip_dbg_with_flag(flag, fmt, args...)		\
 	do {						\
 		if (flag & usbip_debug_flag)		\
 			pr_debug(fmt, ##args);		\
 	} while (0)

 #define usbip_dbg_sysfs(fmt, args...) \
 	usbip_dbg_with_flag(usbip_debug_sysfs, fmt , ##args)
 #define usbip_dbg_xmit(fmt, args...) \
 	usbip_dbg_with_flag(usbip_debug_xmit, fmt , ##args)
 #define usbip_dbg_urb(fmt, args...) \
 	usbip_dbg_with_flag(usbip_debug_urb, fmt , ##args)
 #define usbip_dbg_eh(fmt, args...) \
 	usbip_dbg_with_flag(usbip_debug_eh, fmt , ##args)

 #define usbip_dbg_vhci_rh(fmt, args...)	\
 	usbip_dbg_with_flag(usbip_debug_vhci_rh, fmt , ##args)
 #define usbip_dbg_vhci_hc(fmt, args...)	\
 	usbip_dbg_with_flag(usbip_debug_vhci_hc, fmt , ##args)
 #define usbip_dbg_vhci_rx(fmt, args...)	\
 	usbip_dbg_with_flag(usbip_debug_vhci_rx, fmt , ##args)
 #define usbip_dbg_vhci_tx(fmt, args...)	\
 	usbip_dbg_with_flag(usbip_debug_vhci_tx, fmt , ##args)
 #define usbip_dbg_vhci_sysfs(fmt, args...) \
 	usbip_dbg_with_flag(usbip_debug_vhci_sysfs, fmt , ##args)

 #define usbip_dbg_stub_cmp(fmt, args...) \
 	usbip_dbg_with_flag(usbip_debug_stub_cmp, fmt , ##args)
 #define usbip_dbg_stub_rx(fmt, args...) \
 	usbip_dbg_with_flag(usbip_debug_stub_rx, fmt , ##args)
 #define usbip_dbg_stub_tx(fmt, args...) \
 	usbip_dbg_with_flag(usbip_debug_stub_tx, fmt , ##args)

 /*
  * USB/IP request headers
  *
  * Each request is transferred across the network to its counterpart, which
  * facilitates the normal USB communication. The values contained in the headers
  * are basically the same as in a URB. Currently, four request types are
  * defined:
  *
  *  - USBIP_CMD_SUBMIT: a USB request block, corresponds to usb_submit_urb()
  *    (client to server)
  *
  *  - USBIP_RET_SUBMIT: the result of USBIP_CMD_SUBMIT
  *    (server to client)
  *
  *  - USBIP_CMD_UNLINK: an unlink request of a pending USBIP_CMD_SUBMIT,
  *    corresponds to usb_unlink_urb()
  *    (client to server)
  *
  *  - USBIP_RET_UNLINK: the result of USBIP_CMD_UNLINK
  *    (server to client)
  *
  */
 #define USBIP_CMD_SUBMIT	0x0001
 #define USBIP_CMD_UNLINK	0x0002
 #define USBIP_RET_SUBMIT	0x0003
 #define USBIP_RET_UNLINK	0x0004

 #define USBIP_DIR_OUT	0x00
 #define USBIP_DIR_IN	0x01

 /**
  * struct usbip_header_basic - data pertinent to every request
  * @command: the usbip request type
  * @seqnum: sequential number that identifies requests; incremented per
  *	    connection
  * @devid: specifies a remote USB device uniquely instead of busnum and devnum;
  *	   in the stub driver, this value is ((busnum << 16) | devnum)
  * @direction: direction of the transfer
  * @ep: endpoint number
  */
 struct usbip_header_basic {
 	__u32 command;
 	__u32 seqnum;
 	__u32 devid;
 	__u32 direction;
 	__u32 ep;
 } __packed;

 /**
  * struct usbip_header_cmd_submit - USBIP_CMD_SUBMIT packet header
  * @transfer_flags: URB flags
  * @transfer_buffer_length: the data size for (in) or (out) transfer
  * @start_frame: initial frame for isochronous or interrupt transfers
  * @number_of_packets: number of isochronous packets
  * @interval: maximum time for the request on the server-side host controller
  * @setup: setup data for a control request
  */
 struct usbip_header_cmd_submit {
 	__u32 transfer_flags;
 	__s32 transfer_buffer_length;

 	/* it is difficult for usbip to sync frames (reserved only?) */
 	__s32 start_frame;
 	__s32 number_of_packets;
 	__s32 interval;

 	unsigned char setup[8];
 } __packed;

 /**
  * struct usbip_header_ret_submit - USBIP_RET_SUBMIT packet header
  * @status: return status of a non-iso request
  * @actual_length: number of bytes transferred
  * @start_frame: initial frame for isochronous or interrupt transfers
  * @number_of_packets: number of isochronous packets
  * @error_count: number of errors for isochronous transfers
  */
 struct usbip_header_ret_submit {
 	__s32 status;
 	__s32 actual_length;
 	__s32 start_frame;
 	__s32 number_of_packets;
 	__s32 error_count;
 } __packed;

 /**
  * struct usbip_header_cmd_unlink - USBIP_CMD_UNLINK packet header
  * @seqnum: the URB seqnum to unlink
  */
 struct usbip_header_cmd_unlink {
 	__u32 seqnum;
 } __packed;

 /**
  * struct usbip_header_ret_unlink - USBIP_RET_UNLINK packet header
  * @status: return status of the request
  */
 struct usbip_header_ret_unlink {
 	__s32 status;
 } __packed;

 /**
  * struct usbip_header - common header for all usbip packets
  * @base: the basic header
  * @u: packet type dependent header
  */
 struct usbip_header {
 	struct usbip_header_basic base;

 	union {
 		struct usbip_header_cmd_submit	cmd_submit;
 		struct usbip_header_ret_submit	ret_submit;
 		struct usbip_header_cmd_unlink	cmd_unlink;
 		struct usbip_header_ret_unlink	ret_unlink;
 	} u;
 } __packed;

 /*
  * This is the same as usb_iso_packet_descriptor but packed for pdu.
  */
 struct usbip_iso_packet_descriptor {
 	__u32 offset;
 	__u32 length;			/* expected length */
 	__u32 actual_length;
 	__u32 status;
 } __packed;

 enum usbip_side {
 	USBIP_VHCI,
 	USBIP_STUB,
 	USBIP_VUDC,
 };

 /* event handler */
 #define USBIP_EH_SHUTDOWN	(1 << 0)
 #define USBIP_EH_BYE		(1 << 1)
 #define USBIP_EH_RESET		(1 << 2)
 #define USBIP_EH_UNUSABLE	(1 << 3)

 #define SDEV_EVENT_REMOVED   (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
 #define	SDEV_EVENT_DOWN		(USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 #define	SDEV_EVENT_ERROR_TCP	(USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 #define	SDEV_EVENT_ERROR_SUBMIT	(USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 #define	SDEV_EVENT_ERROR_MALLOC	(USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)

 #define VUDC_EVENT_REMOVED   (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
 #define	VUDC_EVENT_DOWN		(USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 #define	VUDC_EVENT_ERROR_TCP	(USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 /* catastrophic emulated usb error */
 #define	VUDC_EVENT_ERROR_USB	(USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 #define	VUDC_EVENT_ERROR_MALLOC	(USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)

 #define	VDEV_EVENT_REMOVED	(USBIP_EH_SHUTDOWN | USBIP_EH_BYE)
 #define	VDEV_EVENT_DOWN		(USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 #define	VDEV_EVENT_ERROR_TCP	(USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 #define	VDEV_EVENT_ERROR_MALLOC	(USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)

 /* a common structure for stub_device and vhci_device */
 struct usbip_device {
 	enum usbip_side side;
 	enum usbip_device_status status;

 	/* lock for status */
 	spinlock_t lock;

 	struct socket *tcp_socket;

 	struct task_struct *tcp_rx;
 	struct task_struct *tcp_tx;

 	unsigned long event;
 	wait_queue_head_t eh_waitq;

 	struct eh_ops {
 		void (*shutdown)(struct usbip_device *);
 		void (*reset)(struct usbip_device *);
 		void (*unusable)(struct usbip_device *);
 	} eh_ops;
 };

 #define kthread_get_run(threadfn, data, namefmt, ...)			   \
 ({									   \
 	struct task_struct *__k						   \
 		= kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
 	if (!IS_ERR(__k)) {						   \
 		get_task_struct(__k);					   \
 		wake_up_process(__k);					   \
 	}								   \
 	__k;								   \
 })

 #define kthread_stop_put(k)		\
 	do {				\
 		kthread_stop(k);	\
 		put_task_struct(k);	\
 	} while (0)

 /* usbip_common.c */
 void usbip_dump_urb(struct urb *purb);
 void usbip_dump_header(struct usbip_header *pdu);

 int usbip_recv(struct socket *sock, void *buf, int size);

 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 		    int pack);
 void usbip_header_correct_endian(struct usbip_header *pdu, int send);

 struct usbip_iso_packet_descriptor*
 usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen);

 /* some members of urb must be substituted before. */
 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb);
 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb);
 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb);

 /* usbip_event.c */
 int usbip_init_eh(void);
 void usbip_finish_eh(void);
 int usbip_start_eh(struct usbip_device *ud);
 void usbip_stop_eh(struct usbip_device *ud);
 void usbip_event_add(struct usbip_device *ud, unsigned long event);
 int usbip_event_happened(struct usbip_device *ud);
 int usbip_in_eh(struct task_struct *task);

 static inline int interface_to_busnum(struct usb_interface *interface)
 {
 	struct usb_device *udev = interface_to_usbdev(interface);

 	return udev->bus->busnum;
 }

 static inline int interface_to_devnum(struct usb_interface *interface)
 {
 	struct usb_device *udev = interface_to_usbdev(interface);

 	return udev->devnum;
 }

 #endif /* __USBIP_COMMON_H */
	/*
	* Copyright (C) 2003-2008 Takahiro Hirofuchi
	* Copyright (C) 2015-2016 Samsung Electronics
	* Krzysztof Opasiak <k.opasiak@samsung.com>
	*
	* This 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 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.
	*/

	#ifndef __USBIP_COMMON_H
	#define __USBIP_COMMON_H

	#include <linux/compiler.h>
	#include <linux/device.h>
	#include <linux/interrupt.h>
	#include <linux/net.h>
	#include <linux/printk.h>
	#include <linux/spinlock.h>
	#include <linux/types.h>
	#include <linux/usb.h>
	#include <linux/wait.h>
	#include <uapi/linux/usbip.h>

	#define USBIP_VERSION "1.0.0"

	#undef pr_fmt

	#ifdef DEBUG
	#define pr_fmt(fmt) KBUILD_MODNAME ": %s:%d: " fmt, __func__, __LINE__
	#else
	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	#endif

	enum {
	usbip_debug_xmit = (1 << 0),
	usbip_debug_sysfs = (1 << 1),
	usbip_debug_urb = (1 << 2),
	usbip_debug_eh = (1 << 3),

	usbip_debug_stub_cmp = (1 << 8),
	usbip_debug_stub_dev = (1 << 9),
	usbip_debug_stub_rx = (1 << 10),
	usbip_debug_stub_tx = (1 << 11),

	usbip_debug_vhci_rh = (1 << 8),
	usbip_debug_vhci_hc = (1 << 9),
	usbip_debug_vhci_rx = (1 << 10),
	usbip_debug_vhci_tx = (1 << 11),
	usbip_debug_vhci_sysfs = (1 << 12)
	};

	#define usbip_dbg_flag_xmit (usbip_debug_flag & usbip_debug_xmit)
	#define usbip_dbg_flag_vhci_rh (usbip_debug_flag & usbip_debug_vhci_rh)
	#define usbip_dbg_flag_vhci_hc (usbip_debug_flag & usbip_debug_vhci_hc)
	#define usbip_dbg_flag_vhci_rx (usbip_debug_flag & usbip_debug_vhci_rx)
	#define usbip_dbg_flag_vhci_tx (usbip_debug_flag & usbip_debug_vhci_tx)
	#define usbip_dbg_flag_stub_rx (usbip_debug_flag & usbip_debug_stub_rx)
	#define usbip_dbg_flag_stub_tx (usbip_debug_flag & usbip_debug_stub_tx)
	#define usbip_dbg_flag_vhci_sysfs (usbip_debug_flag & usbip_debug_vhci_sysfs)

	extern unsigned long usbip_debug_flag;
	extern struct device_attribute dev_attr_usbip_debug;

	#define usbip_dbg_with_flag(flag, fmt, args...) \
	do { \
	if (flag & usbip_debug_flag) \
	pr_debug(fmt, ##args); \
	} while (0)

	#define usbip_dbg_sysfs(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_sysfs, fmt , ##args)
	#define usbip_dbg_xmit(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_xmit, fmt , ##args)
	#define usbip_dbg_urb(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_urb, fmt , ##args)
	#define usbip_dbg_eh(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_eh, fmt , ##args)

	#define usbip_dbg_vhci_rh(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_vhci_rh, fmt , ##args)
	#define usbip_dbg_vhci_hc(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_vhci_hc, fmt , ##args)
	#define usbip_dbg_vhci_rx(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_vhci_rx, fmt , ##args)
	#define usbip_dbg_vhci_tx(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_vhci_tx, fmt , ##args)
	#define usbip_dbg_vhci_sysfs(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_vhci_sysfs, fmt , ##args)

	#define usbip_dbg_stub_cmp(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_stub_cmp, fmt , ##args)
	#define usbip_dbg_stub_rx(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_stub_rx, fmt , ##args)
	#define usbip_dbg_stub_tx(fmt, args...) \
	usbip_dbg_with_flag(usbip_debug_stub_tx, fmt , ##args)

	/*
	* USB/IP request headers
	*
	* Each request is transferred across the network to its counterpart, which
	* facilitates the normal USB communication. The values contained in the headers
	* are basically the same as in a URB. Currently, four request types are
	* defined:
	*
	* - USBIP_CMD_SUBMIT: a USB request block, corresponds to usb_submit_urb()
	* (client to server)
	*
	* - USBIP_RET_SUBMIT: the result of USBIP_CMD_SUBMIT
	* (server to client)
	*
	* - USBIP_CMD_UNLINK: an unlink request of a pending USBIP_CMD_SUBMIT,
	* corresponds to usb_unlink_urb()
	* (client to server)
	*
	* - USBIP_RET_UNLINK: the result of USBIP_CMD_UNLINK
	* (server to client)
	*
	*/
	#define USBIP_CMD_SUBMIT 0x0001
	#define USBIP_CMD_UNLINK 0x0002
	#define USBIP_RET_SUBMIT 0x0003
	#define USBIP_RET_UNLINK 0x0004

	#define USBIP_DIR_OUT 0x00
	#define USBIP_DIR_IN 0x01

	/**
	* struct usbip_header_basic - data pertinent to every request
	* @command: the usbip request type
	* @seqnum: sequential number that identifies requests; incremented per
	* connection
	* @devid: specifies a remote USB device uniquely instead of busnum and devnum;
	* in the stub driver, this value is ((busnum << 16) \| devnum)
	* @direction: direction of the transfer
	* @ep: endpoint number
	*/
	struct usbip_header_basic {
	__u32 command;
	__u32 seqnum;
	__u32 devid;
	__u32 direction;
	__u32 ep;
	} __packed;

	/**
	* struct usbip_header_cmd_submit - USBIP_CMD_SUBMIT packet header
	* @transfer_flags: URB flags
	* @transfer_buffer_length: the data size for (in) or (out) transfer
	* @start_frame: initial frame for isochronous or interrupt transfers
	* @number_of_packets: number of isochronous packets
	* @interval: maximum time for the request on the server-side host controller
	* @setup: setup data for a control request
	*/
	struct usbip_header_cmd_submit {
	__u32 transfer_flags;
	__s32 transfer_buffer_length;

	/* it is difficult for usbip to sync frames (reserved only?) */
	__s32 start_frame;
	__s32 number_of_packets;
	__s32 interval;

	unsigned char setup[8];
	} __packed;

	/**
	* struct usbip_header_ret_submit - USBIP_RET_SUBMIT packet header
	* @status: return status of a non-iso request
	* @actual_length: number of bytes transferred
	* @start_frame: initial frame for isochronous or interrupt transfers
	* @number_of_packets: number of isochronous packets
	* @error_count: number of errors for isochronous transfers
	*/
	struct usbip_header_ret_submit {
	__s32 status;
	__s32 actual_length;
	__s32 start_frame;
	__s32 number_of_packets;
	__s32 error_count;
	} __packed;

	/**
	* struct usbip_header_cmd_unlink - USBIP_CMD_UNLINK packet header
	* @seqnum: the URB seqnum to unlink
	*/
	struct usbip_header_cmd_unlink {
	__u32 seqnum;
	} __packed;

	/**
	* struct usbip_header_ret_unlink - USBIP_RET_UNLINK packet header
	* @status: return status of the request
	*/
	struct usbip_header_ret_unlink {
	__s32 status;
	} __packed;

	/**
	* struct usbip_header - common header for all usbip packets
	* @base: the basic header
	* @u: packet type dependent header
	*/
	struct usbip_header {
	struct usbip_header_basic base;

	union {
	struct usbip_header_cmd_submit cmd_submit;
	struct usbip_header_ret_submit ret_submit;
	struct usbip_header_cmd_unlink cmd_unlink;
	struct usbip_header_ret_unlink ret_unlink;
	} u;
	} __packed;

	/*
	* This is the same as usb_iso_packet_descriptor but packed for pdu.
	*/
	struct usbip_iso_packet_descriptor {
	__u32 offset;
	__u32 length; /* expected length */
	__u32 actual_length;
	__u32 status;
	} __packed;

	enum usbip_side {
	USBIP_VHCI,
	USBIP_STUB,
	USBIP_VUDC,
	};

	/* event handler */
	#define USBIP_EH_SHUTDOWN (1 << 0)
	#define USBIP_EH_BYE (1 << 1)
	#define USBIP_EH_RESET (1 << 2)
	#define USBIP_EH_UNUSABLE (1 << 3)

	#define SDEV_EVENT_REMOVED (USBIP_EH_SHUTDOWN \| USBIP_EH_RESET \| USBIP_EH_BYE)
	#define SDEV_EVENT_DOWN (USBIP_EH_SHUTDOWN \| USBIP_EH_RESET)
	#define SDEV_EVENT_ERROR_TCP (USBIP_EH_SHUTDOWN \| USBIP_EH_RESET)
	#define SDEV_EVENT_ERROR_SUBMIT (USBIP_EH_SHUTDOWN \| USBIP_EH_RESET)
	#define SDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN \| USBIP_EH_UNUSABLE)

	#define VUDC_EVENT_REMOVED (USBIP_EH_SHUTDOWN \| USBIP_EH_RESET \| USBIP_EH_BYE)
	#define VUDC_EVENT_DOWN (USBIP_EH_SHUTDOWN \| USBIP_EH_RESET)
	#define VUDC_EVENT_ERROR_TCP (USBIP_EH_SHUTDOWN \| USBIP_EH_RESET)
	/* catastrophic emulated usb error */
	#define VUDC_EVENT_ERROR_USB (USBIP_EH_SHUTDOWN \| USBIP_EH_UNUSABLE)
	#define VUDC_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN \| USBIP_EH_UNUSABLE)

	#define VDEV_EVENT_REMOVED (USBIP_EH_SHUTDOWN \| USBIP_EH_BYE)
	#define VDEV_EVENT_DOWN (USBIP_EH_SHUTDOWN \| USBIP_EH_RESET)
	#define VDEV_EVENT_ERROR_TCP (USBIP_EH_SHUTDOWN \| USBIP_EH_RESET)
	#define VDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN \| USBIP_EH_UNUSABLE)

	/* a common structure for stub_device and vhci_device */
	struct usbip_device {
	enum usbip_side side;
	enum usbip_device_status status;

	/* lock for status */
	spinlock_t lock;

	struct socket *tcp_socket;

	struct task_struct *tcp_rx;
	struct task_struct *tcp_tx;

	unsigned long event;
	wait_queue_head_t eh_waitq;

	struct eh_ops {
	void (shutdown)(struct usbip_device );
	void (reset)(struct usbip_device );
	void (unusable)(struct usbip_device );
	} eh_ops;
	};

	#define kthread_get_run(threadfn, data, namefmt, ...) \
	({ \
	struct task_struct *__k \
	= kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
	if (!IS_ERR(__k)) { \
	get_task_struct(__k); \
	wake_up_process(__k); \
	} \
	__k; \
	})

	#define kthread_stop_put(k) \
	do { \
	kthread_stop(k); \
	put_task_struct(k); \
	} while (0)

	/* usbip_common.c */
	void usbip_dump_urb(struct urb *purb);
	void usbip_dump_header(struct usbip_header *pdu);

	int usbip_recv(struct socket sock, void buf, int size);

	void usbip_pack_pdu(struct usbip_header pdu, struct urb urb, int cmd,
	int pack);
	void usbip_header_correct_endian(struct usbip_header *pdu, int send);

	struct usbip_iso_packet_descriptor*
	usbip_alloc_iso_desc_pdu(struct urb urb, ssize_t bufflen);

	/* some members of urb must be substituted before. */
	int usbip_recv_iso(struct usbip_device ud, struct urb urb);
	void usbip_pad_iso(struct usbip_device ud, struct urb urb);
	int usbip_recv_xbuff(struct usbip_device ud, struct urb urb);

	/* usbip_event.c */
	int usbip_init_eh(void);
	void usbip_finish_eh(void);
	int usbip_start_eh(struct usbip_device *ud);
	void usbip_stop_eh(struct usbip_device *ud);
	void usbip_event_add(struct usbip_device *ud, unsigned long event);
	int usbip_event_happened(struct usbip_device *ud);
	int usbip_in_eh(struct task_struct *task);

	static inline int interface_to_busnum(struct usb_interface *interface)
	{
	struct usb_device *udev = interface_to_usbdev(interface);

	return udev->bus->busnum;
	}

	static inline int interface_to_devnum(struct usb_interface *interface)
	{
	struct usb_device *udev = interface_to_usbdev(interface);

	return udev->devnum;
	}

	#endif /* __USBIP_COMMON_H */