drivers/usb/usbip/usbip_common.h

   1 /*
   2  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   3  *
   4  * This is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17  * USA.
  18  */
  19
  20 #ifndef __USBIP_COMMON_H
  21 #define __USBIP_COMMON_H
  22
  23 #include <linux/compiler.h>
  24 #include <linux/device.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/net.h>
  27 #include <linux/printk.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/types.h>
  30 #include <linux/usb.h>
  31 #include <linux/wait.h>
  32 #include <uapi/linux/usbip.h>
  33
  34 #define USBIP_VERSION "1.0.0"
  35
  36 #undef pr_fmt
  37
  38 #ifdef DEBUG
  39 #define pr_fmt(fmt)     KBUILD_MODNAME ": %s:%d: " fmt, __func__, __LINE__
  40 #else
  41 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  42 #endif
  43
  44 enum {
  45         usbip_debug_xmit        = (1 << 0),
  46         usbip_debug_sysfs       = (1 << 1),
  47         usbip_debug_urb         = (1 << 2),
  48         usbip_debug_eh          = (1 << 3),
  49
  50         usbip_debug_stub_cmp    = (1 << 8),
  51         usbip_debug_stub_dev    = (1 << 9),
  52         usbip_debug_stub_rx     = (1 << 10),
  53         usbip_debug_stub_tx     = (1 << 11),
  54
  55         usbip_debug_vhci_rh     = (1 << 8),
  56         usbip_debug_vhci_hc     = (1 << 9),
  57         usbip_debug_vhci_rx     = (1 << 10),
  58         usbip_debug_vhci_tx     = (1 << 11),
  59         usbip_debug_vhci_sysfs  = (1 << 12)
  60 };
  61
  62 #define usbip_dbg_flag_xmit     (usbip_debug_flag & usbip_debug_xmit)
  63 #define usbip_dbg_flag_vhci_rh  (usbip_debug_flag & usbip_debug_vhci_rh)
  64 #define usbip_dbg_flag_vhci_hc  (usbip_debug_flag & usbip_debug_vhci_hc)
  65 #define usbip_dbg_flag_vhci_rx  (usbip_debug_flag & usbip_debug_vhci_rx)
  66 #define usbip_dbg_flag_vhci_tx  (usbip_debug_flag & usbip_debug_vhci_tx)
  67 #define usbip_dbg_flag_stub_rx  (usbip_debug_flag & usbip_debug_stub_rx)
  68 #define usbip_dbg_flag_stub_tx  (usbip_debug_flag & usbip_debug_stub_tx)
  69 #define usbip_dbg_flag_vhci_sysfs  (usbip_debug_flag & usbip_debug_vhci_sysfs)
  70
  71 extern unsigned long usbip_debug_flag;
  72 extern struct device_attribute dev_attr_usbip_debug;
  73
  74 #define usbip_dbg_with_flag(flag, fmt, args...)         \
  75         do {                                            \
  76                 if (flag & usbip_debug_flag)            \
  77                         pr_debug(fmt, ##args);          \
  78         } while (0)
  79
  80 #define usbip_dbg_sysfs(fmt, args...) \
  81         usbip_dbg_with_flag(usbip_debug_sysfs, fmt , ##args)
  82 #define usbip_dbg_xmit(fmt, args...) \
  83         usbip_dbg_with_flag(usbip_debug_xmit, fmt , ##args)
  84 #define usbip_dbg_urb(fmt, args...) \
  85         usbip_dbg_with_flag(usbip_debug_urb, fmt , ##args)
  86 #define usbip_dbg_eh(fmt, args...) \
  87         usbip_dbg_with_flag(usbip_debug_eh, fmt , ##args)
  88
  89 #define usbip_dbg_vhci_rh(fmt, args...) \
  90         usbip_dbg_with_flag(usbip_debug_vhci_rh, fmt , ##args)
  91 #define usbip_dbg_vhci_hc(fmt, args...) \
  92         usbip_dbg_with_flag(usbip_debug_vhci_hc, fmt , ##args)
  93 #define usbip_dbg_vhci_rx(fmt, args...) \
  94         usbip_dbg_with_flag(usbip_debug_vhci_rx, fmt , ##args)
  95 #define usbip_dbg_vhci_tx(fmt, args...) \
  96         usbip_dbg_with_flag(usbip_debug_vhci_tx, fmt , ##args)
  97 #define usbip_dbg_vhci_sysfs(fmt, args...) \
  98         usbip_dbg_with_flag(usbip_debug_vhci_sysfs, fmt , ##args)
  99
 100 #define usbip_dbg_stub_cmp(fmt, args...) \
 101         usbip_dbg_with_flag(usbip_debug_stub_cmp, fmt , ##args)
 102 #define usbip_dbg_stub_rx(fmt, args...) \
 103         usbip_dbg_with_flag(usbip_debug_stub_rx, fmt , ##args)
 104 #define usbip_dbg_stub_tx(fmt, args...) \
 105         usbip_dbg_with_flag(usbip_debug_stub_tx, fmt , ##args)
 106
 107 /*
 108  * USB/IP request headers
 109  *
 110  * Each request is transferred across the network to its counterpart, which
 111  * facilitates the normal USB communication. The values contained in the headers
 112  * are basically the same as in a URB. Currently, four request types are
 113  * defined:
 114  *
 115  *  - USBIP_CMD_SUBMIT: a USB request block, corresponds to usb_submit_urb()
 116  *    (client to server)
 117  *
 118  *  - USBIP_RET_SUBMIT: the result of USBIP_CMD_SUBMIT
 119  *    (server to client)
 120  *
 121  *  - USBIP_CMD_UNLINK: an unlink request of a pending USBIP_CMD_SUBMIT,
 122  *    corresponds to usb_unlink_urb()
 123  *    (client to server)
 124  *
 125  *  - USBIP_RET_UNLINK: the result of USBIP_CMD_UNLINK
 126  *    (server to client)
 127  *
 128  */
 129 #define USBIP_CMD_SUBMIT        0x0001
 130 #define USBIP_CMD_UNLINK        0x0002
 131 #define USBIP_RET_SUBMIT        0x0003
 132 #define USBIP_RET_UNLINK        0x0004
 133
 134 #define USBIP_DIR_OUT   0x00
 135 #define USBIP_DIR_IN    0x01
 136
 137 /**
 138  * struct usbip_header_basic - data pertinent to every request
 139  * @command: the usbip request type
 140  * @seqnum: sequential number that identifies requests; incremented per
 141  *          connection
 142  * @devid: specifies a remote USB device uniquely instead of busnum and devnum;
 143  *         in the stub driver, this value is ((busnum << 16) | devnum)
 144  * @direction: direction of the transfer
 145  * @ep: endpoint number
 146  */
 147 struct usbip_header_basic {
 148         __u32 command;
 149         __u32 seqnum;
 150         __u32 devid;
 151         __u32 direction;
 152         __u32 ep;
 153 } __packed;
 154
 155 /**
 156  * struct usbip_header_cmd_submit - USBIP_CMD_SUBMIT packet header
 157  * @transfer_flags: URB flags
 158  * @transfer_buffer_length: the data size for (in) or (out) transfer
 159  * @start_frame: initial frame for isochronous or interrupt transfers
 160  * @number_of_packets: number of isochronous packets
 161  * @interval: maximum time for the request on the server-side host controller
 162  * @setup: setup data for a control request
 163  */
 164 struct usbip_header_cmd_submit {
 165         __u32 transfer_flags;
 166         __s32 transfer_buffer_length;
 167
 168         /* it is difficult for usbip to sync frames (reserved only?) */
 169         __s32 start_frame;
 170         __s32 number_of_packets;
 171         __s32 interval;
 172
 173         unsigned char setup[8];
 174 } __packed;
 175
 176 /**
 177  * struct usbip_header_ret_submit - USBIP_RET_SUBMIT packet header
 178  * @status: return status of a non-iso request
 179  * @actual_length: number of bytes transferred
 180  * @start_frame: initial frame for isochronous or interrupt transfers
 181  * @number_of_packets: number of isochronous packets
 182  * @error_count: number of errors for isochronous transfers
 183  */
 184 struct usbip_header_ret_submit {
 185         __s32 status;
 186         __s32 actual_length;
 187         __s32 start_frame;
 188         __s32 number_of_packets;
 189         __s32 error_count;
 190 } __packed;
 191
 192 /**
 193  * struct usbip_header_cmd_unlink - USBIP_CMD_UNLINK packet header
 194  * @seqnum: the URB seqnum to unlink
 195  */
 196 struct usbip_header_cmd_unlink {
 197         __u32 seqnum;
 198 } __packed;
 199
 200 /**
 201  * struct usbip_header_ret_unlink - USBIP_RET_UNLINK packet header
 202  * @status: return status of the request
 203  */
 204 struct usbip_header_ret_unlink {
 205         __s32 status;
 206 } __packed;
 207
 208 /**
 209  * struct usbip_header - common header for all usbip packets
 210  * @base: the basic header
 211  * @u: packet type dependent header
 212  */
 213 struct usbip_header {
 214         struct usbip_header_basic base;
 215
 216         union {
 217                 struct usbip_header_cmd_submit  cmd_submit;
 218                 struct usbip_header_ret_submit  ret_submit;
 219                 struct usbip_header_cmd_unlink  cmd_unlink;
 220                 struct usbip_header_ret_unlink  ret_unlink;
 221         } u;
 222 } __packed;
 223
 224 /*
 225  * This is the same as usb_iso_packet_descriptor but packed for pdu.
 226  */
 227 struct usbip_iso_packet_descriptor {
 228         __u32 offset;
 229         __u32 length;                   /* expected length */
 230         __u32 actual_length;
 231         __u32 status;
 232 } __packed;
 233
 234 enum usbip_side {
 235         USBIP_VHCI,
 236         USBIP_STUB,
 237 };
 238
 239 /* event handler */
 240 #define USBIP_EH_SHUTDOWN       (1 << 0)
 241 #define USBIP_EH_BYE            (1 << 1)
 242 #define USBIP_EH_RESET          (1 << 2)
 243 #define USBIP_EH_UNUSABLE       (1 << 3)
 244
 245 #define SDEV_EVENT_REMOVED   (USBIP_EH_SHUTDOWN | USBIP_EH_RESET | USBIP_EH_BYE)
 246 #define SDEV_EVENT_DOWN         (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 247 #define SDEV_EVENT_ERROR_TCP    (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 248 #define SDEV_EVENT_ERROR_SUBMIT (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 249 #define SDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 250
 251 #define VDEV_EVENT_REMOVED      (USBIP_EH_SHUTDOWN | USBIP_EH_BYE)
 252 #define VDEV_EVENT_DOWN         (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 253 #define VDEV_EVENT_ERROR_TCP    (USBIP_EH_SHUTDOWN | USBIP_EH_RESET)
 254 #define VDEV_EVENT_ERROR_MALLOC (USBIP_EH_SHUTDOWN | USBIP_EH_UNUSABLE)
 255
 256 /* a common structure for stub_device and vhci_device */
 257 struct usbip_device {
 258         enum usbip_side side;
 259         enum usbip_device_status status;
 260
 261         /* lock for status */
 262         spinlock_t lock;
 263
 264         struct socket *tcp_socket;
 265
 266         struct task_struct *tcp_rx;
 267         struct task_struct *tcp_tx;
 268
 269         unsigned long event;
 270         struct task_struct *eh;
 271         wait_queue_head_t eh_waitq;
 272
 273         struct eh_ops {
 274                 void (*shutdown)(struct usbip_device *);
 275                 void (*reset)(struct usbip_device *);
 276                 void (*unusable)(struct usbip_device *);
 277         } eh_ops;
 278 };
 279
 280 #define kthread_get_run(threadfn, data, namefmt, ...)                      \
 281 ({                                                                         \
 282         struct task_struct *__k                                            \
 283                 = kthread_create(threadfn, data, namefmt, ## __VA_ARGS__); \
 284         if (!IS_ERR(__k)) {                                                \
 285                 get_task_struct(__k);                                      \
 286                 wake_up_process(__k);                                      \
 287         }                                                                  \
 288         __k;                                                               \
 289 })
 290
 291 #define kthread_stop_put(k)             \
 292         do {                            \
 293                 kthread_stop(k);        \
 294                 put_task_struct(k);     \
 295         } while (0)
 296
 297 /* usbip_common.c */
 298 void usbip_dump_urb(struct urb *purb);
 299 void usbip_dump_header(struct usbip_header *pdu);
 300
 301 int usbip_recv(struct socket *sock, void *buf, int size);
 302
 303 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 304                     int pack);
 305 void usbip_header_correct_endian(struct usbip_header *pdu, int send);
 306
 307 struct usbip_iso_packet_descriptor*
 308 usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen);
 309
 310 /* some members of urb must be substituted before. */
 311 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb);
 312 void usbip_pad_iso(struct usbip_device *ud, struct urb *urb);
 313 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb);
 314
 315 /* usbip_event.c */
 316 int usbip_start_eh(struct usbip_device *ud);
 317 void usbip_stop_eh(struct usbip_device *ud);
 318 void usbip_event_add(struct usbip_device *ud, unsigned long event);
 319 int usbip_event_happened(struct usbip_device *ud);
 320
 321 static inline int interface_to_busnum(struct usb_interface *interface)
 322 {
 323         struct usb_device *udev = interface_to_usbdev(interface);
 324
 325         return udev->bus->busnum;
 326 }
 327
 328 static inline int interface_to_devnum(struct usb_interface *interface)
 329 {
 330         struct usb_device *udev = interface_to_usbdev(interface);
 331
 332         return udev->devnum;
 333 }
 334
 335 #endif /* __USBIP_COMMON_H */