drivers/staging/usbip/usbip_common.c

   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 #include <linux/kernel.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/file.h>
  23 #include <linux/tcp.h>
  24 #include <linux/in.h>
  25 #include <linux/kthread.h>
  26 #include "usbip_common.h"
  27
  28 /* version information */
  29 #define DRIVER_VERSION "1.0"
  30 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi _at_ users.sourceforge.net>"
  31 #define DRIVER_DESC "usbip common driver"
  32
  33 /*-------------------------------------------------------------------------*/
  34 /* debug routines */
  35
  36 #ifdef CONFIG_USB_IP_DEBUG_ENABLE
  37 unsigned long usbip_debug_flag = 0xffffffff;
  38 #else
  39 unsigned long usbip_debug_flag;
  40 #endif
  41 EXPORT_SYMBOL_GPL(usbip_debug_flag);
  42
  43
  44 /* FIXME */
  45 struct device_attribute dev_attr_usbip_debug;
  46 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
  47
  48
  49 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
  50                                                                 char *buf)
  51 {
  52         return sprintf(buf, "%lx\n", usbip_debug_flag);
  53 }
  54
  55 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
  56                 const char *buf, size_t count)
  57 {
  58         sscanf(buf, "%lx", &usbip_debug_flag);
  59
  60         return count;
  61 }
  62 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
  63
  64 static void usbip_dump_buffer(char *buff, int bufflen)
  65 {
  66         print_hex_dump(KERN_DEBUG, "usb-ip", DUMP_PREFIX_OFFSET, 16, 4,
  67                        buff, bufflen, false);
  68 }
  69
  70 static void usbip_dump_pipe(unsigned int p)
  71 {
  72         unsigned char type = usb_pipetype(p);
  73         unsigned char ep = usb_pipeendpoint(p);
  74         unsigned char dev = usb_pipedevice(p);
  75         unsigned char dir = usb_pipein(p);
  76
  77         printk(KERN_DEBUG "dev(%d) ", dev);
  78         printk(KERN_DEBUG "ep(%d) ",  ep);
  79         printk(KERN_DEBUG "%s ", dir ? "IN" : "OUT");
  80
  81         switch (type) {
  82         case PIPE_ISOCHRONOUS:
  83                 printk(KERN_DEBUG "%s ", "ISO");
  84                 break;
  85         case PIPE_INTERRUPT:
  86                 printk(KERN_DEBUG "%s ", "INT");
  87                 break;
  88         case PIPE_CONTROL:
  89                 printk(KERN_DEBUG "%s ", "CTL");
  90                 break;
  91         case PIPE_BULK:
  92                 printk(KERN_DEBUG "%s ", "BLK");
  93                 break;
  94         default:
  95                 printk(KERN_DEBUG "ERR");
  96         }
  97
  98         printk(KERN_DEBUG "\n");
  99
 100 }
 101
 102 static void usbip_dump_usb_device(struct usb_device *udev)
 103 {
 104         struct device *dev = &udev->dev;
 105         int i;
 106
 107         dev_dbg(dev, "       devnum(%d) devpath(%s)",
 108                 udev->devnum, udev->devpath);
 109
 110         switch (udev->speed) {
 111         case USB_SPEED_HIGH:
 112                 printk(KERN_DEBUG " SPD_HIGH");
 113                 break;
 114         case USB_SPEED_FULL:
 115                 printk(KERN_DEBUG " SPD_FULL");
 116                 break;
 117         case USB_SPEED_LOW:
 118                 printk(KERN_DEBUG " SPD_LOW");
 119                 break;
 120         case USB_SPEED_UNKNOWN:
 121                 printk(KERN_DEBUG " SPD_UNKNOWN");
 122                 break;
 123         default:
 124                 printk(KERN_DEBUG " SPD_ERROR");
 125         }
 126
 127         printk(KERN_DEBUG " tt %p, ttport %d", udev->tt, udev->ttport);
 128         printk(KERN_DEBUG "\n");
 129
 130         dev_dbg(dev, "                    ");
 131         for (i = 0; i < 16; i++)
 132                 printk(KERN_DEBUG " %2u", i);
 133         printk(KERN_DEBUG "\n");
 134
 135         dev_dbg(dev, "       toggle0(IN) :");
 136         for (i = 0; i < 16; i++)
 137                 printk(KERN_DEBUG " %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
 138         printk(KERN_DEBUG "\n");
 139
 140         dev_dbg(dev, "       toggle1(OUT):");
 141         for (i = 0; i < 16; i++)
 142                 printk(KERN_DEBUG " %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
 143         printk(KERN_DEBUG "\n");
 144
 145
 146         dev_dbg(dev, "       epmaxp_in   :");
 147         for (i = 0; i < 16; i++) {
 148                 if (udev->ep_in[i])
 149                         printk(KERN_DEBUG " %2u",
 150                              le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
 151         }
 152         printk(KERN_DEBUG "\n");
 153
 154         dev_dbg(dev, "       epmaxp_out  :");
 155         for (i = 0; i < 16; i++) {
 156                 if (udev->ep_out[i])
 157                         printk(KERN_DEBUG " %2u",
 158                              le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
 159         }
 160         printk(KERN_DEBUG "\n");
 161
 162         dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
 163
 164         dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
 165                 "rawdescriptors %p\n", &udev->descriptor, udev->config,
 166                 udev->actconfig, udev->rawdescriptors);
 167
 168         dev_dbg(dev, "have_langid %d, string_langid %d\n",
 169                 udev->have_langid, udev->string_langid);
 170
 171         dev_dbg(dev, "maxchild %d, children %p\n",
 172                 udev->maxchild, udev->children);
 173 }
 174
 175 static void usbip_dump_request_type(__u8 rt)
 176 {
 177         switch (rt & USB_RECIP_MASK) {
 178         case USB_RECIP_DEVICE:
 179                 printk(KERN_DEBUG "DEVICE");
 180                 break;
 181         case USB_RECIP_INTERFACE:
 182                 printk(KERN_DEBUG "INTERF");
 183                 break;
 184         case USB_RECIP_ENDPOINT:
 185                 printk(KERN_DEBUG "ENDPOI");
 186                 break;
 187         case USB_RECIP_OTHER:
 188                 printk(KERN_DEBUG "OTHER ");
 189                 break;
 190         default:
 191                 printk(KERN_DEBUG "------");
 192         }
 193 }
 194
 195 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
 196 {
 197         if (!cmd) {
 198                 printk(KERN_DEBUG "      %s : null pointer\n", __func__);
 199                 return;
 200         }
 201
 202         printk(KERN_DEBUG "       ");
 203         printk(KERN_DEBUG "bRequestType(%02X) ", cmd->bRequestType);
 204         printk(KERN_DEBUG "bRequest(%02X) " , cmd->bRequest);
 205         printk(KERN_DEBUG "wValue(%04X) ", cmd->wValue);
 206         printk(KERN_DEBUG "wIndex(%04X) ", cmd->wIndex);
 207         printk(KERN_DEBUG "wLength(%04X) ", cmd->wLength);
 208
 209         printk(KERN_DEBUG "\n       ");
 210
 211         if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
 212                 printk(KERN_DEBUG "STANDARD ");
 213                 switch (cmd->bRequest) {
 214                 case USB_REQ_GET_STATUS:
 215                         printk(KERN_DEBUG "GET_STATUS");
 216                         break;
 217                 case USB_REQ_CLEAR_FEATURE:
 218                         printk(KERN_DEBUG "CLEAR_FEAT");
 219                         break;
 220                 case USB_REQ_SET_FEATURE:
 221                         printk(KERN_DEBUG "SET_FEAT  ");
 222                         break;
 223                 case USB_REQ_SET_ADDRESS:
 224                         printk(KERN_DEBUG "SET_ADDRRS");
 225                         break;
 226                 case USB_REQ_GET_DESCRIPTOR:
 227                         printk(KERN_DEBUG "GET_DESCRI");
 228                         break;
 229                 case USB_REQ_SET_DESCRIPTOR:
 230                         printk(KERN_DEBUG "SET_DESCRI");
 231                         break;
 232                 case USB_REQ_GET_CONFIGURATION:
 233                         printk(KERN_DEBUG "GET_CONFIG");
 234                         break;
 235                 case USB_REQ_SET_CONFIGURATION:
 236                         printk(KERN_DEBUG "SET_CONFIG");
 237                         break;
 238                 case USB_REQ_GET_INTERFACE:
 239                         printk(KERN_DEBUG "GET_INTERF");
 240                         break;
 241                 case USB_REQ_SET_INTERFACE:
 242                         printk(KERN_DEBUG "SET_INTERF");
 243                         break;
 244                 case USB_REQ_SYNCH_FRAME:
 245                         printk(KERN_DEBUG "SYNC_FRAME");
 246                         break;
 247                 default:
 248                         printk(KERN_DEBUG "REQ(%02X) ", cmd->bRequest);
 249                 }
 250
 251                 printk(KERN_DEBUG " ");
 252                 usbip_dump_request_type(cmd->bRequestType);
 253
 254         } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
 255                 printk(KERN_DEBUG "CLASS   ");
 256
 257         else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR)
 258                 printk(KERN_DEBUG "VENDOR  ");
 259
 260         else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED)
 261                 printk(KERN_DEBUG "RESERVED");
 262
 263         printk(KERN_DEBUG "\n");
 264 }
 265
 266 void usbip_dump_urb(struct urb *urb)
 267 {
 268         struct device *dev;
 269
 270         if (!urb) {
 271                 printk(KERN_DEBUG KBUILD_MODNAME
 272                        ":%s: urb: null pointer!!\n", __func__);
 273                 return;
 274         }
 275
 276         if (!urb->dev) {
 277                 printk(KERN_DEBUG KBUILD_MODNAME
 278                        ":%s: urb->dev: null pointer!!\n", __func__);
 279                 return;
 280         }
 281         dev = &urb->dev->dev;
 282
 283         dev_dbg(dev, "   urb                   :%p\n", urb);
 284         dev_dbg(dev, "   dev                   :%p\n", urb->dev);
 285
 286         usbip_dump_usb_device(urb->dev);
 287
 288         dev_dbg(dev, "   pipe                  :%08x ", urb->pipe);
 289
 290         usbip_dump_pipe(urb->pipe);
 291
 292         dev_dbg(dev, "   status                :%d\n", urb->status);
 293         dev_dbg(dev, "   transfer_flags        :%08X\n", urb->transfer_flags);
 294         dev_dbg(dev, "   transfer_buffer       :%p\n", urb->transfer_buffer);
 295         dev_dbg(dev, "   transfer_buffer_length:%d\n",
 296                                                 urb->transfer_buffer_length);
 297         dev_dbg(dev, "   actual_length         :%d\n", urb->actual_length);
 298         dev_dbg(dev, "   setup_packet          :%p\n", urb->setup_packet);
 299
 300         if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
 301                         usbip_dump_usb_ctrlrequest(
 302                         (struct usb_ctrlrequest *)urb->setup_packet);
 303
 304         dev_dbg(dev, "   start_frame           :%d\n", urb->start_frame);
 305         dev_dbg(dev, "   number_of_packets     :%d\n", urb->number_of_packets);
 306         dev_dbg(dev, "   interval              :%d\n", urb->interval);
 307         dev_dbg(dev, "   error_count           :%d\n", urb->error_count);
 308         dev_dbg(dev, "   context               :%p\n", urb->context);
 309         dev_dbg(dev, "   complete              :%p\n", urb->complete);
 310 }
 311 EXPORT_SYMBOL_GPL(usbip_dump_urb);
 312
 313 void usbip_dump_header(struct usbip_header *pdu)
 314 {
 315         usbip_udbg("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
 316                         pdu->base.command,
 317                         pdu->base.seqnum,
 318                         pdu->base.devid,
 319                         pdu->base.direction,
 320                         pdu->base.ep);
 321
 322         switch (pdu->base.command) {
 323         case USBIP_CMD_SUBMIT:
 324                 usbip_udbg("CMD_SUBMIT: "
 325                                 "x_flags %u x_len %u sf %u #p %u iv %u\n",
 326                                 pdu->u.cmd_submit.transfer_flags,
 327                                 pdu->u.cmd_submit.transfer_buffer_length,
 328                                 pdu->u.cmd_submit.start_frame,
 329                                 pdu->u.cmd_submit.number_of_packets,
 330                                 pdu->u.cmd_submit.interval);
 331                                 break;
 332         case USBIP_CMD_UNLINK:
 333                 usbip_udbg("CMD_UNLINK: seq %u\n", pdu->u.cmd_unlink.seqnum);
 334                 break;
 335         case USBIP_RET_SUBMIT:
 336                 usbip_udbg("RET_SUBMIT: st %d al %u sf %d ec %d\n",
 337                                 pdu->u.ret_submit.status,
 338                                 pdu->u.ret_submit.actual_length,
 339                                 pdu->u.ret_submit.start_frame,
 340                                 pdu->u.ret_submit.error_count);
 341         case USBIP_RET_UNLINK:
 342                 usbip_udbg("RET_UNLINK: status %d\n", pdu->u.ret_unlink.status);
 343                 break;
 344         default:
 345                 /* NOT REACHED */
 346                 usbip_udbg("UNKNOWN\n");
 347         }
 348 }
 349 EXPORT_SYMBOL_GPL(usbip_dump_header);
 350
 351
 352 /*-------------------------------------------------------------------------*/
 353 /* thread routines */
 354
 355 int usbip_thread(void *param)
 356 {
 357         struct usbip_task *ut = param;
 358
 359         if (!ut)
 360                 return -EINVAL;
 361
 362         lock_kernel();
 363         daemonize(ut->name);
 364         allow_signal(SIGKILL);
 365         ut->thread = current;
 366         unlock_kernel();
 367
 368         /* srv.rb must wait for rx_thread starting */
 369         complete(&ut->thread_done);
 370
 371         /* start of while loop */
 372         ut->loop_ops(ut);
 373
 374         /* end of loop */
 375         ut->thread = NULL;
 376
 377         complete_and_exit(&ut->thread_done, 0);
 378 }
 379
 380 int usbip_start_threads(struct usbip_device *ud)
 381 {
 382         /*
 383          * threads are invoked per one device (per one connection).
 384          */
 385         struct task_struct *th;
 386
 387         th = kthread_run(usbip_thread, (void *)&ud->tcp_rx, "usbip");
 388         if (IS_ERR(th)) {
 389                 printk(KERN_WARNING
 390                         "Unable to start control thread\n");
 391                 return PTR_ERR(th);
 392         }
 393         th = kthread_run(usbip_thread, (void *)&ud->tcp_tx, "usbip");
 394         if (IS_ERR(th)) {
 395                 printk(KERN_WARNING
 396                         "Unable to start control thread\n");
 397                 return PTR_ERR(th);
 398         }
 399
 400         /* confirm threads are starting */
 401         wait_for_completion(&ud->tcp_rx.thread_done);
 402         wait_for_completion(&ud->tcp_tx.thread_done);
 403         return 0;
 404 }
 405 EXPORT_SYMBOL_GPL(usbip_start_threads);
 406
 407 void usbip_stop_threads(struct usbip_device *ud)
 408 {
 409         /* kill threads related to this sdev, if v.c. exists */
 410         if (ud->tcp_rx.thread != NULL) {
 411                 send_sig(SIGKILL, ud->tcp_rx.thread, 1);
 412                 wait_for_completion(&ud->tcp_rx.thread_done);
 413                 usbip_udbg("rx_thread for ud %p has finished\n", ud);
 414         }
 415
 416         if (ud->tcp_tx.thread != NULL) {
 417                 send_sig(SIGKILL, ud->tcp_tx.thread, 1);
 418                 wait_for_completion(&ud->tcp_tx.thread_done);
 419                 usbip_udbg("tx_thread for ud %p has finished\n", ud);
 420         }
 421 }
 422 EXPORT_SYMBOL_GPL(usbip_stop_threads);
 423
 424 void usbip_task_init(struct usbip_task *ut, char *name,
 425                 void (*loop_ops)(struct usbip_task *))
 426 {
 427         ut->thread = NULL;
 428         init_completion(&ut->thread_done);
 429         ut->name = name;
 430         ut->loop_ops = loop_ops;
 431 }
 432 EXPORT_SYMBOL_GPL(usbip_task_init);
 433
 434
 435 /*-------------------------------------------------------------------------*/
 436 /* socket routines */
 437
 438  /*  Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
 439 int usbip_xmit(int send, struct socket *sock, char *buf,
 440                int size, int msg_flags)
 441 {
 442         int result;
 443         struct msghdr msg;
 444         struct kvec iov;
 445         int total = 0;
 446
 447         /* for blocks of if (usbip_dbg_flag_xmit) */
 448         char *bp = buf;
 449         int osize = size;
 450
 451         usbip_dbg_xmit("enter\n");
 452
 453         if (!sock || !buf || !size) {
 454                 printk(KERN_ERR "%s: invalid arg, sock %p buff %p size %d\n",
 455                        __func__, sock, buf, size);
 456                 return -EINVAL;
 457         }
 458
 459
 460         if (usbip_dbg_flag_xmit) {
 461                 if (send) {
 462                         if (!in_interrupt())
 463                                 printk(KERN_DEBUG "%-10s:", current->comm);
 464                         else
 465                                 printk(KERN_DEBUG "interrupt  :");
 466
 467                         printk(KERN_DEBUG "%s: sending... , sock %p, buf %p, "
 468                                "size %d, msg_flags %d\n", __func__,
 469                                sock, buf, size, msg_flags);
 470                         usbip_dump_buffer(buf, size);
 471                 }
 472         }
 473
 474
 475         do {
 476                 sock->sk->sk_allocation = GFP_NOIO;
 477                 iov.iov_base    = buf;
 478                 iov.iov_len     = size;
 479                 msg.msg_name    = NULL;
 480                 msg.msg_namelen = 0;
 481                 msg.msg_control = NULL;
 482                 msg.msg_controllen = 0;
 483                 msg.msg_namelen    = 0;
 484                 msg.msg_flags      = msg_flags | MSG_NOSIGNAL;
 485
 486                 if (send)
 487                         result = kernel_sendmsg(sock, &msg, &iov, 1, size);
 488                 else
 489                         result = kernel_recvmsg(sock, &msg, &iov, 1, size,
 490                                                                 MSG_WAITALL);
 491
 492                 if (result <= 0) {
 493                         usbip_udbg("usbip_xmit: %s sock %p buf %p size %u ret "
 494                                         "%d total %d\n",
 495                                         send ? "send" : "receive", sock, buf,
 496                                         size, result, total);
 497                         goto err;
 498                 }
 499
 500                 size -= result;
 501                 buf += result;
 502                 total += result;
 503
 504         } while (size > 0);
 505
 506
 507         if (usbip_dbg_flag_xmit) {
 508                 if (!send) {
 509                         if (!in_interrupt())
 510                                 printk(KERN_DEBUG "%-10s:", current->comm);
 511                         else
 512                                 printk(KERN_DEBUG "interrupt  :");
 513
 514                         printk(KERN_DEBUG "usbip_xmit: receiving....\n");
 515                         usbip_dump_buffer(bp, osize);
 516                         printk(KERN_DEBUG "usbip_xmit: received, osize %d ret "
 517                                         "%d size %d total %d\n", osize, result,
 518                                         size, total);
 519                 }
 520
 521                 if (send)
 522                         printk(KERN_DEBUG "usbip_xmit: send, total %d\n",
 523                                                                         total);
 524         }
 525
 526         return total;
 527
 528 err:
 529         return result;
 530 }
 531 EXPORT_SYMBOL_GPL(usbip_xmit);
 532
 533 struct socket *sockfd_to_socket(unsigned int sockfd)
 534 {
 535         struct socket *socket;
 536         struct file *file;
 537         struct inode *inode;
 538
 539         file = fget(sockfd);
 540         if (!file) {
 541                 printk(KERN_ERR "%s: invalid sockfd\n", __func__);
 542                 return NULL;
 543         }
 544
 545         inode = file->f_dentry->d_inode;
 546
 547         if (!inode || !S_ISSOCK(inode->i_mode))
 548                 return NULL;
 549
 550         socket = SOCKET_I(inode);
 551
 552         return socket;
 553 }
 554 EXPORT_SYMBOL_GPL(sockfd_to_socket);
 555
 556
 557
 558 /*-------------------------------------------------------------------------*/
 559 /* pdu routines */
 560
 561 /* there may be more cases to tweak the flags. */
 562 static unsigned int tweak_transfer_flags(unsigned int flags)
 563 {
 564         flags &= ~(URB_NO_TRANSFER_DMA_MAP|URB_NO_SETUP_DMA_MAP);
 565         return flags;
 566 }
 567
 568 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
 569                                                                 int pack)
 570 {
 571         struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
 572
 573         /*
 574          * Some members are not still implemented in usbip. I hope this issue
 575          * will be discussed when usbip is ported to other operating systems.
 576          */
 577         if (pack) {
 578                 /* vhci_tx.c */
 579                 spdu->transfer_flags =
 580                                 tweak_transfer_flags(urb->transfer_flags);
 581                 spdu->transfer_buffer_length    = urb->transfer_buffer_length;
 582                 spdu->start_frame               = urb->start_frame;
 583                 spdu->number_of_packets         = urb->number_of_packets;
 584                 spdu->interval                  = urb->interval;
 585         } else  {
 586                 /* stub_rx.c */
 587                 urb->transfer_flags         = spdu->transfer_flags;
 588
 589                 urb->transfer_buffer_length = spdu->transfer_buffer_length;
 590                 urb->start_frame            = spdu->start_frame;
 591                 urb->number_of_packets      = spdu->number_of_packets;
 592                 urb->interval               = spdu->interval;
 593         }
 594 }
 595
 596 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
 597                                                                 int pack)
 598 {
 599         struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
 600
 601         if (pack) {
 602                 /* stub_tx.c */
 603
 604                 rpdu->status            = urb->status;
 605                 rpdu->actual_length     = urb->actual_length;
 606                 rpdu->start_frame       = urb->start_frame;
 607                 rpdu->error_count       = urb->error_count;
 608         } else {
 609                 /* vhci_rx.c */
 610
 611                 urb->status             = rpdu->status;
 612                 urb->actual_length      = rpdu->actual_length;
 613                 urb->start_frame        = rpdu->start_frame;
 614                 urb->error_count        = rpdu->error_count;
 615         }
 616 }
 617
 618
 619 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
 620                                                                 int pack)
 621 {
 622         switch (cmd) {
 623         case USBIP_CMD_SUBMIT:
 624                 usbip_pack_cmd_submit(pdu, urb, pack);
 625                 break;
 626         case USBIP_RET_SUBMIT:
 627                 usbip_pack_ret_submit(pdu, urb, pack);
 628                 break;
 629         default:
 630                 err("unknown command");
 631                 /* NOTREACHED */
 632                 /* BUG(); */
 633         }
 634 }
 635 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
 636
 637
 638 static void correct_endian_basic(struct usbip_header_basic *base, int send)
 639 {
 640         if (send) {
 641                 base->command   = cpu_to_be32(base->command);
 642                 base->seqnum    = cpu_to_be32(base->seqnum);
 643                 base->devid     = cpu_to_be32(base->devid);
 644                 base->direction = cpu_to_be32(base->direction);
 645                 base->ep        = cpu_to_be32(base->ep);
 646         } else {
 647                 base->command   = be32_to_cpu(base->command);
 648                 base->seqnum    = be32_to_cpu(base->seqnum);
 649                 base->devid     = be32_to_cpu(base->devid);
 650                 base->direction = be32_to_cpu(base->direction);
 651                 base->ep        = be32_to_cpu(base->ep);
 652         }
 653 }
 654
 655 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
 656                                                                 int send)
 657 {
 658         if (send) {
 659                 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
 660
 661                 cpu_to_be32s(&pdu->transfer_buffer_length);
 662                 cpu_to_be32s(&pdu->start_frame);
 663                 cpu_to_be32s(&pdu->number_of_packets);
 664                 cpu_to_be32s(&pdu->interval);
 665         } else {
 666                 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
 667
 668                 be32_to_cpus(&pdu->transfer_buffer_length);
 669                 be32_to_cpus(&pdu->start_frame);
 670                 be32_to_cpus(&pdu->number_of_packets);
 671                 be32_to_cpus(&pdu->interval);
 672         }
 673 }
 674
 675 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
 676                                                                 int send)
 677 {
 678         if (send) {
 679                 cpu_to_be32s(&pdu->status);
 680                 cpu_to_be32s(&pdu->actual_length);
 681                 cpu_to_be32s(&pdu->start_frame);
 682                 cpu_to_be32s(&pdu->error_count);
 683         } else {
 684                 be32_to_cpus(&pdu->status);
 685                 be32_to_cpus(&pdu->actual_length);
 686                 be32_to_cpus(&pdu->start_frame);
 687                 be32_to_cpus(&pdu->error_count);
 688         }
 689 }
 690
 691 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
 692                                                                 int send)
 693 {
 694         if (send)
 695                 pdu->seqnum = cpu_to_be32(pdu->seqnum);
 696         else
 697                 pdu->seqnum = be32_to_cpu(pdu->seqnum);
 698 }
 699
 700 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
 701                                                                 int send)
 702 {
 703         if (send)
 704                 cpu_to_be32s(&pdu->status);
 705         else
 706                 be32_to_cpus(&pdu->status);
 707 }
 708
 709 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
 710 {
 711         __u32 cmd = 0;
 712
 713         if (send)
 714                 cmd = pdu->base.command;
 715
 716         correct_endian_basic(&pdu->base, send);
 717
 718         if (!send)
 719                 cmd = pdu->base.command;
 720
 721         switch (cmd) {
 722         case USBIP_CMD_SUBMIT:
 723                 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
 724                 break;
 725         case USBIP_RET_SUBMIT:
 726                 correct_endian_ret_submit(&pdu->u.ret_submit, send);
 727                 break;
 728         case USBIP_CMD_UNLINK:
 729                 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
 730                 break;
 731         case USBIP_RET_UNLINK:
 732                 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
 733                 break;
 734         default:
 735                 /* NOTREACHED */
 736                 err("unknown command in pdu header: %d", cmd);
 737                 /* BUG(); */
 738         }
 739 }
 740 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
 741
 742 static void usbip_iso_pakcet_correct_endian(
 743                                 struct usbip_iso_packet_descriptor *iso,
 744                                 int send)
 745 {
 746         /* does not need all members. but copy all simply. */
 747         if (send) {
 748                 iso->offset     = cpu_to_be32(iso->offset);
 749                 iso->length     = cpu_to_be32(iso->length);
 750                 iso->status     = cpu_to_be32(iso->status);
 751                 iso->actual_length = cpu_to_be32(iso->actual_length);
 752         } else {
 753                 iso->offset     = be32_to_cpu(iso->offset);
 754                 iso->length     = be32_to_cpu(iso->length);
 755                 iso->status     = be32_to_cpu(iso->status);
 756                 iso->actual_length = be32_to_cpu(iso->actual_length);
 757         }
 758 }
 759
 760 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
 761                 struct usb_iso_packet_descriptor *uiso, int pack)
 762 {
 763         if (pack) {
 764                 iso->offset             = uiso->offset;
 765                 iso->length             = uiso->length;
 766                 iso->status             = uiso->status;
 767                 iso->actual_length      = uiso->actual_length;
 768         } else {
 769                 uiso->offset            = iso->offset;
 770                 uiso->length            = iso->length;
 771                 uiso->status            = iso->status;
 772                 uiso->actual_length     = iso->actual_length;
 773         }
 774 }
 775
 776
 777 /* must free buffer */
 778 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
 779 {
 780         void *buff;
 781         struct usbip_iso_packet_descriptor *iso;
 782         int np = urb->number_of_packets;
 783         ssize_t size = np * sizeof(*iso);
 784         int i;
 785
 786         buff = kzalloc(size, GFP_KERNEL);
 787         if (!buff)
 788                 return NULL;
 789
 790         for (i = 0; i < np; i++) {
 791                 iso = buff + (i * sizeof(*iso));
 792
 793                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
 794                 usbip_iso_pakcet_correct_endian(iso, 1);
 795         }
 796
 797         *bufflen = size;
 798
 799         return buff;
 800 }
 801 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
 802
 803 /* some members of urb must be substituted before. */
 804 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
 805 {
 806         void *buff;
 807         struct usbip_iso_packet_descriptor *iso;
 808         int np = urb->number_of_packets;
 809         int size = np * sizeof(*iso);
 810         int i;
 811         int ret;
 812
 813         if (!usb_pipeisoc(urb->pipe))
 814                 return 0;
 815
 816         /* my Bluetooth dongle gets ISO URBs which are np = 0 */
 817         if (np == 0) {
 818                 /* usbip_uinfo("iso np == 0\n"); */
 819                 /* usbip_dump_urb(urb); */
 820                 return 0;
 821         }
 822
 823         buff = kzalloc(size, GFP_KERNEL);
 824         if (!buff)
 825                 return -ENOMEM;
 826
 827         ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
 828         if (ret != size) {
 829                 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
 830                         ret);
 831                 kfree(buff);
 832
 833                 if (ud->side == USBIP_STUB)
 834                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 835                 else
 836                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 837
 838                 return -EPIPE;
 839         }
 840
 841         for (i = 0; i < np; i++) {
 842                 iso = buff + (i * sizeof(*iso));
 843
 844                 usbip_iso_pakcet_correct_endian(iso, 0);
 845                 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
 846         }
 847
 848         kfree(buff);
 849
 850         return ret;
 851 }
 852 EXPORT_SYMBOL_GPL(usbip_recv_iso);
 853
 854
 855 /* some members of urb must be substituted before. */
 856 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
 857 {
 858         int ret;
 859         int size;
 860
 861         if (ud->side == USBIP_STUB) {
 862                 /* stub_rx.c */
 863                 /* the direction of urb must be OUT. */
 864                 if (usb_pipein(urb->pipe))
 865                         return 0;
 866
 867                 size = urb->transfer_buffer_length;
 868         } else {
 869                 /* vhci_rx.c */
 870                 /* the direction of urb must be IN. */
 871                 if (usb_pipeout(urb->pipe))
 872                         return 0;
 873
 874                 size = urb->actual_length;
 875         }
 876
 877         /* no need to recv xbuff */
 878         if (!(size > 0))
 879                 return 0;
 880
 881         ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
 882                          size, 0);
 883         if (ret != size) {
 884                 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
 885                 if (ud->side == USBIP_STUB) {
 886                         usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
 887                 } else {
 888                         usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
 889                         return -EPIPE;
 890                 }
 891         }
 892
 893         return ret;
 894 }
 895 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
 896
 897
 898 /*-------------------------------------------------------------------------*/
 899
 900 static int __init usbip_common_init(void)
 901 {
 902         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "" DRIVER_VERSION);
 903
 904         return 0;
 905 }
 906
 907 static void __exit usbip_common_exit(void)
 908 {
 909         return;
 910 }
 911
 912
 913
 914
 915 module_init(usbip_common_init);
 916 module_exit(usbip_common_exit);
 917
 918 MODULE_AUTHOR(DRIVER_AUTHOR);
 919 MODULE_DESCRIPTION(DRIVER_DESC);
 920 MODULE_LICENSE("GPL");