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staging: usbip: usbip_common.h: reorganize and document request headers 

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>
This commit is contained in:
matt mooney 2011-05-19 21:37:02 -07:00 committed by Greg Kroah-Hartman
parent 2282e1fb6b
commit b7d27eadf8
1 changed files with 121 additions and 115 deletions
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236
drivers/staging/usbip/usbip_common.h
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@ -104,111 +104,110 @@ extern struct device_attribute dev_attr_usbip_debug;
usbip_dbg_with_flag(usbip_debug_stub_tx, fmt , ##args) usbip_dbg_with_flag(usbip_debug_stub_tx, fmt , ##args)
/* /*
* USB/IP request headers. * USB/IP request headers
* Currently, we define 4 request types:
* *
* - CMD_SUBMIT transfers a USB request, corresponding to usb_submit_urb(). * 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) * (client to server)
* - RET_RETURN transfers the result of CMD_SUBMIT. *
* (server to client) * - USBIP_RET_SUBMIT: the result of USBIP_CMD_SUBMIT
* - CMD_UNLINK transfers an unlink request of a pending USB request.
* (client to server)
* - RET_UNLINK transfers the result of CMD_UNLINK.
* (server to client) * (server to client)
* *
* Note: The below request formats are based on the USB subsystem of Linux. Its * - USBIP_CMD_UNLINK: an unlink request of a pending USBIP_CMD_SUBMIT,
* details will be defined when other implementations come. * 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
/* #define USBIP_DIR_IN 0x00
* A basic header followed by other additional headers. #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 { 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; __u32 command;
/* sequential number which identifies requests.
* incremented per connections */
__u32 seqnum; __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; __u32 devid;
#define USBIP_DIR_OUT 0
#define USBIP_DIR_IN 1
__u32 direction; __u32 direction;
__u32 ep; /* endpoint number */ __u32 ep;
} __packed; } __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 { struct usbip_header_cmd_submit {
/* these values are basically the same as in a URB. */
/* the same in a URB. */
__u32 transfer_flags; __u32 transfer_flags;
/* set the following data size (out),
* or expected reading data size (in) */
__s32 transfer_buffer_length; __s32 transfer_buffer_length;
/* it is difficult for usbip to sync frames (reserved only?) */ /* it is difficult for usbip to sync frames (reserved only?) */
__s32 start_frame; __s32 start_frame;
/* the number of iso descriptors that follows this header */
__s32 number_of_packets; __s32 number_of_packets;
/* the maximum time within which this request works in a host
* controller of a server side */
__s32 interval; __s32 interval;
/* set setup packet data for a CTRL request */
unsigned char setup[8]; unsigned char setup[8];
} __packed; } __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 { struct usbip_header_ret_submit {
__s32 status; __s32 status;
__s32 actual_length; /* returned data length */ __s32 actual_length;
__s32 start_frame; /* ISO and INT */ __s32 start_frame;
__s32 number_of_packets; /* ISO only */ __s32 number_of_packets;
__s32 error_count; /* ISO only */ __s32 error_count;
} __packed; } __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 { struct usbip_header_cmd_unlink {
__u32 seqnum; /* URB's seqnum that will be unlinked */ __u32 seqnum;
} __packed; } __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 { struct usbip_header_ret_unlink {
__s32 status; __s32 status;
} __packed; } __packed;
/* the same as usb_iso_packet_descriptor but packed for pdu */ /**
struct usbip_iso_packet_descriptor { * struct usbip_header - common header for all usbip packets
__u32 offset; * @base: the basic header
__u32 length; /* expected length */ * @u: packet type dependent header
__u32 actual_length;
__u32 status;
} __packed;
/*
* All usbip packets use a common header to keep code simple.
*/ */
struct usbip_header { struct usbip_header {
struct usbip_header_basic base; struct usbip_header_basic base;
@ -221,40 +220,15 @@ struct usbip_header {
} u; } u;
} __packed; } __packed;
int usbip_xmit(int, struct socket *, char *, int, int); /*
int usbip_sendmsg(struct socket *, struct msghdr *, int); * This is the same as usb_iso_packet_descriptor but packed for pdu.
*/
static inline int interface_to_busnum(struct usb_interface *interface) struct usbip_iso_packet_descriptor {
{ __u32 offset;
struct usb_device *udev = interface_to_usbdev(interface); __u32 length; /* expected length */
return udev->bus->busnum; __u32 actual_length;
} __u32 status;
} __packed;
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;
enum usbip_side { enum usbip_side {
USBIP_VHCI, USBIP_VHCI,
@ -277,20 +251,7 @@ enum usbip_status {
VDEV_ST_ERROR VDEV_ST_ERROR
}; };
/* a common structure for stub_device and vhci_device */ /* event handler */
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 */
#define USBIP_EH_SHUTDOWN (1 << 0) #define USBIP_EH_SHUTDOWN (1 << 0)
#define USBIP_EH_BYE (1 << 1) #define USBIP_EH_BYE (1 << 1)
#define USBIP_EH_RESET (1 << 2) #define USBIP_EH_RESET (1 << 2)
@ -307,6 +268,19 @@ struct usbip_device {
#define VDEV_EVENT_ERROR_TCP (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) #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; unsigned long event;
struct task_struct *eh; struct task_struct *eh;
wait_queue_head_t eh_waitq; wait_queue_head_t eh_waitq;
@ -318,17 +292,32 @@ struct usbip_device {
} eh_ops; } 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, void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
int pack); int pack);
void usbip_header_correct_endian(struct usbip_header *pdu, int send); 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. */ /* some members of urb must be substituted before. */
int usbip_recv_iso(struct usbip_device *ud, struct urb *urb); 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); 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 */ /* usbip_event.c */
int usbip_start_eh(struct usbip_device *ud); int usbip_start_eh(struct usbip_device *ud);
@ -336,4 +325,21 @@ void usbip_stop_eh(struct usbip_device *ud);
void usbip_event_add(struct usbip_device *ud, unsigned long event); void usbip_event_add(struct usbip_device *ud, unsigned long event);
int usbip_event_happened(struct usbip_device *ud); 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 */ #endif /* __USBIP_COMMON_H */