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staging: usbip: usbip_common.h: reorganize and document request headers
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Document the request header structures; move #defines out of the
structures; organize function declarations by source file; and move
inline functions to the end of file.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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matt mooney authored and Greg Kroah-Hartman committed Jun 7, 2011
1 parent 2282e1f commit b7d27ea
Showing 1 changed file with 121 additions and 115 deletions.
236 changes: 121 additions & 115 deletions drivers/staging/usbip/usbip_common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -104,111 +104,110 @@ extern struct device_attribute dev_attr_usbip_debug;
usbip_dbg_with_flag(usbip_debug_stub_tx, fmt , ##args)

/*
* USB/IP request headers.
* Currently, we define 4 request types:
* USB/IP request headers
*
* - CMD_SUBMIT transfers a USB request, corresponding to usb_submit_urb().
* (client to server)
* - RET_RETURN transfers the result of CMD_SUBMIT.
* (server to client)
* - CMD_UNLINK transfers an unlink request of a pending USB request.
* 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)
* - RET_UNLINK transfers the result of CMD_UNLINK.
*
* - USBIP_RET_SUBMIT: the result of USBIP_CMD_SUBMIT
* (server to client)
*
* Note: The below request formats are based on the USB subsystem of Linux. Its
* details will be defined when other implementations come.
* - 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_RET_SUBMIT 0x0002
#define USBIP_CMD_UNLINK 0x0003
#define USBIP_RET_UNLINK 0x0004

/*
* A basic header followed by other additional headers.
#define USBIP_DIR_IN 0x00
#define USBIP_DIR_OUT 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 {
#define USBIP_CMD_SUBMIT 0x0001
#define USBIP_CMD_UNLINK 0x0002
#define USBIP_RET_SUBMIT 0x0003
#define USBIP_RET_UNLINK 0x0004
__u32 command;

/* sequential number which identifies requests.
* incremented per connections */
__u32 seqnum;

/* devid is used to specify a remote USB device uniquely instead
* of busnum and devnum in Linux. In the case of Linux stub_driver,
* this value is ((busnum << 16) | devnum) */
__u32 devid;

#define USBIP_DIR_OUT 0
#define USBIP_DIR_IN 1
__u32 direction;
__u32 ep; /* endpoint number */
__u32 ep;
} __packed;

/*
* An additional header for a CMD_SUBMIT packet.
/**
* 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 {
/* these values are basically the same as in a URB. */

/* the same in a URB. */
__u32 transfer_flags;

/* set the following data size (out),
* or expected reading data size (in) */
__s32 transfer_buffer_length;

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

/* the number of iso descriptors that follows this header */
__s32 number_of_packets;

/* the maximum time within which this request works in a host
* controller of a server side */
__s32 interval;

/* set setup packet data for a CTRL request */
unsigned char setup[8];
} __packed;

/*
* An additional header for a RET_SUBMIT packet.
/**
* 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; /* returned data length */
__s32 start_frame; /* ISO and INT */
__s32 number_of_packets; /* ISO only */
__s32 error_count; /* ISO only */
__s32 actual_length;
__s32 start_frame;
__s32 number_of_packets;
__s32 error_count;
} __packed;

/*
* An additional header for a CMD_UNLINK packet.
/**
* struct usbip_header_cmd_unlink - USBIP_CMD_UNLINK packet header
* @seqnum: the URB seqnum to unlink
*/
struct usbip_header_cmd_unlink {
__u32 seqnum; /* URB's seqnum that will be unlinked */
__u32 seqnum;
} __packed;

/*
* An additional header for a RET_UNLINK packet.
/**
* struct usbip_header_ret_unlink - USBIP_RET_UNLINK packet header
* @status: return status of the request
*/
struct usbip_header_ret_unlink {
__s32 status;
} __packed;

/* 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;

/*
* All usbip packets use a common header to keep code simple.
/**
* 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;
Expand All @@ -221,40 +220,15 @@ struct usbip_header {
} u;
} __packed;

int usbip_xmit(int, struct socket *, char *, int, int);
int usbip_sendmsg(struct socket *, struct msghdr *, int);

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;
}

static inline int interface_to_infnum(struct usb_interface *interface)
{
return interface->cur_altsetting->desc.bInterfaceNumber;
}

#if 0
int setnodelay(struct socket *);
int setquickack(struct socket *);
int setkeepalive(struct socket *socket);
void setreuse(struct socket *);
#endif

struct socket *sockfd_to_socket(unsigned int);
int set_sockaddr(struct socket *socket, struct sockaddr_storage *ss);

void usbip_dump_urb(struct urb *purb);
void usbip_dump_header(struct usbip_header *pdu);

struct usbip_device;
/*
* 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,
Expand All @@ -277,20 +251,7 @@ enum usbip_status {
VDEV_ST_ERROR
};

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

/* lock for status */
spinlock_t lock;

struct socket *tcp_socket;

struct task_struct *tcp_rx;
struct task_struct *tcp_tx;

/* event handler */
/* event handler */
#define USBIP_EH_SHUTDOWN (1 << 0)
#define USBIP_EH_BYE (1 << 1)
#define USBIP_EH_RESET (1 << 2)
Expand All @@ -307,6 +268,19 @@ struct usbip_device {
#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_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;
struct task_struct *eh;
wait_queue_head_t eh_waitq;
Expand All @@ -318,22 +292,54 @@ struct usbip_device {
} eh_ops;
};

#if 0
int usbip_sendmsg(struct socket *, struct msghdr *, int);
int set_sockaddr(struct socket *socket, struct sockaddr_storage *ss);
int setnodelay(struct socket *);
int setquickack(struct socket *);
int setkeepalive(struct socket *socket);
void setreuse(struct socket *);
#endif

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

int usbip_xmit(int send, struct socket *sock, char *buf, int size,
int msg_flags);
struct socket *sockfd_to_socket(unsigned int sockfd);

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

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

/* usbip_event.c */
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);

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;
}

static inline int interface_to_infnum(struct usb_interface *interface)
{
return interface->cur_altsetting->desc.bInterfaceNumber;
}

#endif /* __USBIP_COMMON_H */

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