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staging: usbip: fix wrong endian conversion
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / usbip / usbip_common.c
blobf4e3e11e02120a84e15abec95fad0003ad80a541
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 <linux/slab.h>
27 #include "usbip_common.h"
28
29 /* version information */
30 #define DRIVER_VERSION "1.0"
31 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi _at_ users.sourceforge.net>"
32 #define DRIVER_DESC "usbip common driver"
33
34 /*-------------------------------------------------------------------------*/
35 /* debug routines */
36
37 #ifdef CONFIG_USB_IP_DEBUG_ENABLE
38 unsigned long usbip_debug_flag = 0xffffffff;
39 #else
40 unsigned long usbip_debug_flag;
41 #endif
42 EXPORT_SYMBOL_GPL(usbip_debug_flag);
43
44
45 /* FIXME */
46 struct device_attribute dev_attr_usbip_debug;
47 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
48
49
50 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
51 char *buf)
52 {
53 return sprintf(buf, "%lx\n", usbip_debug_flag);
54 }
55
56 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
57 const char *buf, size_t count)
58 {
59 sscanf(buf, "%lx", &usbip_debug_flag);
60
61 return count;
62 }
63 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
64
65 static void usbip_dump_buffer(char *buff, int bufflen)
66 {
67 print_hex_dump(KERN_DEBUG, "usb-ip", DUMP_PREFIX_OFFSET, 16, 4,
68 buff, bufflen, false);
69 }
70
71 static void usbip_dump_pipe(unsigned int p)
72 {
73 unsigned char type = usb_pipetype(p);
74 unsigned char ep = usb_pipeendpoint(p);
75 unsigned char dev = usb_pipedevice(p);
76 unsigned char dir = usb_pipein(p);
77
78 printk(KERN_DEBUG "dev(%d) ", dev);
79 printk(KERN_DEBUG "ep(%d) ", ep);
80 printk(KERN_DEBUG "%s ", dir ? "IN" : "OUT");
81
82 switch (type) {
83 case PIPE_ISOCHRONOUS:
84 printk(KERN_DEBUG "%s ", "ISO");
85 break;
86 case PIPE_INTERRUPT:
87 printk(KERN_DEBUG "%s ", "INT");
88 break;
89 case PIPE_CONTROL:
90 printk(KERN_DEBUG "%s ", "CTL");
91 break;
92 case PIPE_BULK:
93 printk(KERN_DEBUG "%s ", "BLK");
94 break;
95 default:
96 printk(KERN_DEBUG "ERR");
97 }
98
99 printk(KERN_DEBUG "\n");
100
101 }
102
103 static void usbip_dump_usb_device(struct usb_device *udev)
104 {
105 struct device *dev = &udev->dev;
106 int i;
107
108 dev_dbg(dev, " devnum(%d) devpath(%s)",
109 udev->devnum, udev->devpath);
110
111 switch (udev->speed) {
112 case USB_SPEED_HIGH:
113 printk(KERN_DEBUG " SPD_HIGH");
114 break;
115 case USB_SPEED_FULL:
116 printk(KERN_DEBUG " SPD_FULL");
117 break;
118 case USB_SPEED_LOW:
119 printk(KERN_DEBUG " SPD_LOW");
120 break;
121 case USB_SPEED_UNKNOWN:
122 printk(KERN_DEBUG " SPD_UNKNOWN");
123 break;
124 default:
125 printk(KERN_DEBUG " SPD_ERROR");
126 }
127
128 printk(KERN_DEBUG " tt %p, ttport %d", udev->tt, udev->ttport);
129 printk(KERN_DEBUG "\n");
130
131 dev_dbg(dev, " ");
132 for (i = 0; i < 16; i++)
133 printk(KERN_DEBUG " %2u", i);
134 printk(KERN_DEBUG "\n");
135
136 dev_dbg(dev, " toggle0(IN) :");
137 for (i = 0; i < 16; i++)
138 printk(KERN_DEBUG " %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
139 printk(KERN_DEBUG "\n");
140
141 dev_dbg(dev, " toggle1(OUT):");
142 for (i = 0; i < 16; i++)
143 printk(KERN_DEBUG " %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
144 printk(KERN_DEBUG "\n");
145
146
147 dev_dbg(dev, " epmaxp_in :");
148 for (i = 0; i < 16; i++) {
149 if (udev->ep_in[i])
150 printk(KERN_DEBUG " %2u",
151 le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
152 }
153 printk(KERN_DEBUG "\n");
154
155 dev_dbg(dev, " epmaxp_out :");
156 for (i = 0; i < 16; i++) {
157 if (udev->ep_out[i])
158 printk(KERN_DEBUG " %2u",
159 le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
160 }
161 printk(KERN_DEBUG "\n");
162
163 dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
164
165 dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
166 "rawdescriptors %p\n", &udev->descriptor, udev->config,
167 udev->actconfig, udev->rawdescriptors);
168
169 dev_dbg(dev, "have_langid %d, string_langid %d\n",
170 udev->have_langid, udev->string_langid);
171
172 dev_dbg(dev, "maxchild %d, children %p\n",
173 udev->maxchild, udev->children);
174 }
175
176 static void usbip_dump_request_type(__u8 rt)
177 {
178 switch (rt & USB_RECIP_MASK) {
179 case USB_RECIP_DEVICE:
180 printk(KERN_DEBUG "DEVICE");
181 break;
182 case USB_RECIP_INTERFACE:
183 printk(KERN_DEBUG "INTERF");
184 break;
185 case USB_RECIP_ENDPOINT:
186 printk(KERN_DEBUG "ENDPOI");
187 break;
188 case USB_RECIP_OTHER:
189 printk(KERN_DEBUG "OTHER ");
190 break;
191 default:
192 printk(KERN_DEBUG "------");
193 }
194 }
195
196 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
197 {
198 if (!cmd) {
199 printk(KERN_DEBUG " %s : null pointer\n", __func__);
200 return;
201 }
202
203 printk(KERN_DEBUG " ");
204 printk(KERN_DEBUG "bRequestType(%02X) ", cmd->bRequestType);
205 printk(KERN_DEBUG "bRequest(%02X) " , cmd->bRequest);
206 printk(KERN_DEBUG "wValue(%04X) ", cmd->wValue);
207 printk(KERN_DEBUG "wIndex(%04X) ", cmd->wIndex);
208 printk(KERN_DEBUG "wLength(%04X) ", cmd->wLength);
209
210 printk(KERN_DEBUG "\n ");
211
212 if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
213 printk(KERN_DEBUG "STANDARD ");
214 switch (cmd->bRequest) {
215 case USB_REQ_GET_STATUS:
216 printk(KERN_DEBUG "GET_STATUS");
217 break;
218 case USB_REQ_CLEAR_FEATURE:
219 printk(KERN_DEBUG "CLEAR_FEAT");
220 break;
221 case USB_REQ_SET_FEATURE:
222 printk(KERN_DEBUG "SET_FEAT ");
223 break;
224 case USB_REQ_SET_ADDRESS:
225 printk(KERN_DEBUG "SET_ADDRRS");
226 break;
227 case USB_REQ_GET_DESCRIPTOR:
228 printk(KERN_DEBUG "GET_DESCRI");
229 break;
230 case USB_REQ_SET_DESCRIPTOR:
231 printk(KERN_DEBUG "SET_DESCRI");
232 break;
233 case USB_REQ_GET_CONFIGURATION:
234 printk(KERN_DEBUG "GET_CONFIG");
235 break;
236 case USB_REQ_SET_CONFIGURATION:
237 printk(KERN_DEBUG "SET_CONFIG");
238 break;
239 case USB_REQ_GET_INTERFACE:
240 printk(KERN_DEBUG "GET_INTERF");
241 break;
242 case USB_REQ_SET_INTERFACE:
243 printk(KERN_DEBUG "SET_INTERF");
244 break;
245 case USB_REQ_SYNCH_FRAME:
246 printk(KERN_DEBUG "SYNC_FRAME");
247 break;
248 default:
249 printk(KERN_DEBUG "REQ(%02X) ", cmd->bRequest);
250 }
251
252 printk(KERN_DEBUG " ");
253 usbip_dump_request_type(cmd->bRequestType);
254
255 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
256 printk(KERN_DEBUG "CLASS ");
257
258 else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR)
259 printk(KERN_DEBUG "VENDOR ");
260
261 else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED)
262 printk(KERN_DEBUG "RESERVED");
263
264 printk(KERN_DEBUG "\n");
265 }
266
267 void usbip_dump_urb(struct urb *urb)
268 {
269 struct device *dev;
270
271 if (!urb) {
272 printk(KERN_DEBUG KBUILD_MODNAME
273 ":%s: urb: null pointer!!\n", __func__);
274 return;
275 }
276
277 if (!urb->dev) {
278 printk(KERN_DEBUG KBUILD_MODNAME
279 ":%s: urb->dev: null pointer!!\n", __func__);
280 return;
281 }
282 dev = &urb->dev->dev;
283
284 dev_dbg(dev, " urb :%p\n", urb);
285 dev_dbg(dev, " dev :%p\n", urb->dev);
286
287 usbip_dump_usb_device(urb->dev);
288
289 dev_dbg(dev, " pipe :%08x ", urb->pipe);
290
291 usbip_dump_pipe(urb->pipe);
292
293 dev_dbg(dev, " status :%d\n", urb->status);
294 dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags);
295 dev_dbg(dev, " transfer_buffer :%p\n", urb->transfer_buffer);
296 dev_dbg(dev, " transfer_buffer_length:%d\n",
297 urb->transfer_buffer_length);
298 dev_dbg(dev, " actual_length :%d\n", urb->actual_length);
299 dev_dbg(dev, " setup_packet :%p\n", urb->setup_packet);
300
301 if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
302 usbip_dump_usb_ctrlrequest(
303 (struct usb_ctrlrequest *)urb->setup_packet);
304
305 dev_dbg(dev, " start_frame :%d\n", urb->start_frame);
306 dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets);
307 dev_dbg(dev, " interval :%d\n", urb->interval);
308 dev_dbg(dev, " error_count :%d\n", urb->error_count);
309 dev_dbg(dev, " context :%p\n", urb->context);
310 dev_dbg(dev, " complete :%p\n", urb->complete);
311 }
312 EXPORT_SYMBOL_GPL(usbip_dump_urb);
313
314 void usbip_dump_header(struct usbip_header *pdu)
315 {
316 usbip_udbg("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
317 pdu->base.command,
318 pdu->base.seqnum,
319 pdu->base.devid,
320 pdu->base.direction,
321 pdu->base.ep);
322
323 switch (pdu->base.command) {
324 case USBIP_CMD_SUBMIT:
325 usbip_udbg("CMD_SUBMIT: "
326 "x_flags %u x_len %u sf %u #p %u iv %u\n",
327 pdu->u.cmd_submit.transfer_flags,
328 pdu->u.cmd_submit.transfer_buffer_length,
329 pdu->u.cmd_submit.start_frame,
330 pdu->u.cmd_submit.number_of_packets,
331 pdu->u.cmd_submit.interval);
332 break;
333 case USBIP_CMD_UNLINK:
334 usbip_udbg("CMD_UNLINK: seq %u\n", pdu->u.cmd_unlink.seqnum);
335 break;
336 case USBIP_RET_SUBMIT:
337 usbip_udbg("RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
338 pdu->u.ret_submit.status,
339 pdu->u.ret_submit.actual_length,
340 pdu->u.ret_submit.start_frame,
341 pdu->u.ret_submit.number_of_packets,
342 pdu->u.ret_submit.error_count);
343 case USBIP_RET_UNLINK:
344 usbip_udbg("RET_UNLINK: status %d\n", pdu->u.ret_unlink.status);
345 break;
346 default:
347 /* NOT REACHED */
348 usbip_udbg("UNKNOWN\n");
349 }
350 }
351 EXPORT_SYMBOL_GPL(usbip_dump_header);
352
353
354 /*-------------------------------------------------------------------------*/
355 /* thread routines */
356
357 int usbip_thread(void *param)
358 {
359 struct usbip_task *ut = param;
360
361 if (!ut)
362 return -EINVAL;
363
364 lock_kernel();
365 daemonize(ut->name);
366 allow_signal(SIGKILL);
367 ut->thread = current;
368 unlock_kernel();
369
370 /* srv.rb must wait for rx_thread starting */
371 complete(&ut->thread_done);
372
373 /* start of while loop */
374 ut->loop_ops(ut);
375
376 /* end of loop */
377 ut->thread = NULL;
378
379 complete_and_exit(&ut->thread_done, 0);
380 }
381
382 static void stop_rx_thread(struct usbip_device *ud)
383 {
384 if (ud->tcp_rx.thread != NULL) {
385 send_sig(SIGKILL, ud->tcp_rx.thread, 1);
386 wait_for_completion(&ud->tcp_rx.thread_done);
387 usbip_udbg("rx_thread for ud %p has finished\n", ud);
388 }
389 }
390
391 static void stop_tx_thread(struct usbip_device *ud)
392 {
393 if (ud->tcp_tx.thread != NULL) {
394 send_sig(SIGKILL, ud->tcp_tx.thread, 1);
395 wait_for_completion(&ud->tcp_tx.thread_done);
396 usbip_udbg("tx_thread for ud %p has finished\n", ud);
397 }
398 }
399
400 int usbip_start_threads(struct usbip_device *ud)
401 {
402 /*
403 * threads are invoked per one device (per one connection).
404 */
405 struct task_struct *th;
406 int err = 0;
407
408 th = kthread_run(usbip_thread, (void *)&ud->tcp_rx, "usbip");
409 if (IS_ERR(th)) {
410 printk(KERN_WARNING
411 "Unable to start control thread\n");
412 err = PTR_ERR(th);
413 goto ust_exit;
414 }
415
416 th = kthread_run(usbip_thread, (void *)&ud->tcp_tx, "usbip");
417 if (IS_ERR(th)) {
418 printk(KERN_WARNING
419 "Unable to start control thread\n");
420 err = PTR_ERR(th);
421 goto tx_thread_err;
422 }
423
424 /* confirm threads are starting */
425 wait_for_completion(&ud->tcp_rx.thread_done);
426 wait_for_completion(&ud->tcp_tx.thread_done);
427
428 return 0;
429
430 tx_thread_err:
431 stop_rx_thread(ud);
432
433 ust_exit:
434 return err;
435 }
436 EXPORT_SYMBOL_GPL(usbip_start_threads);
437
438 void usbip_stop_threads(struct usbip_device *ud)
439 {
440 /* kill threads related to this sdev, if v.c. exists */
441 stop_rx_thread(ud);
442 stop_tx_thread(ud);
443 }
444 EXPORT_SYMBOL_GPL(usbip_stop_threads);
445
446 void usbip_task_init(struct usbip_task *ut, char *name,
447 void (*loop_ops)(struct usbip_task *))
448 {
449 ut->thread = NULL;
450 init_completion(&ut->thread_done);
451 ut->name = name;
452 ut->loop_ops = loop_ops;
453 }
454 EXPORT_SYMBOL_GPL(usbip_task_init);
455
456
457 /*-------------------------------------------------------------------------*/
458 /* socket routines */
459
460 /* Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
461 int usbip_xmit(int send, struct socket *sock, char *buf,
462 int size, int msg_flags)
463 {
464 int result;
465 struct msghdr msg;
466 struct kvec iov;
467 int total = 0;
468
469 /* for blocks of if (usbip_dbg_flag_xmit) */
470 char *bp = buf;
471 int osize = size;
472
473 usbip_dbg_xmit("enter\n");
474
475 if (!sock || !buf || !size) {
476 printk(KERN_ERR "%s: invalid arg, sock %p buff %p size %d\n",
477 __func__, sock, buf, size);
478 return -EINVAL;
479 }
480
481
482 if (usbip_dbg_flag_xmit) {
483 if (send) {
484 if (!in_interrupt())
485 printk(KERN_DEBUG "%-10s:", current->comm);
486 else
487 printk(KERN_DEBUG "interrupt :");
488
489 printk(KERN_DEBUG "%s: sending... , sock %p, buf %p, "
490 "size %d, msg_flags %d\n", __func__,
491 sock, buf, size, msg_flags);
492 usbip_dump_buffer(buf, size);
493 }
494 }
495
496
497 do {
498 sock->sk->sk_allocation = GFP_NOIO;
499 iov.iov_base = buf;
500 iov.iov_len = size;
501 msg.msg_name = NULL;
502 msg.msg_namelen = 0;
503 msg.msg_control = NULL;
504 msg.msg_controllen = 0;
505 msg.msg_namelen = 0;
506 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
507
508 if (send)
509 result = kernel_sendmsg(sock, &msg, &iov, 1, size);
510 else
511 result = kernel_recvmsg(sock, &msg, &iov, 1, size,
512 MSG_WAITALL);
513
514 if (result <= 0) {
515 usbip_udbg("usbip_xmit: %s sock %p buf %p size %u ret "
516 "%d total %d\n",
517 send ? "send" : "receive", sock, buf,
518 size, result, total);
519 goto err;
520 }
521
522 size -= result;
523 buf += result;
524 total += result;
525
526 } while (size > 0);
527
528
529 if (usbip_dbg_flag_xmit) {
530 if (!send) {
531 if (!in_interrupt())
532 printk(KERN_DEBUG "%-10s:", current->comm);
533 else
534 printk(KERN_DEBUG "interrupt :");
535
536 printk(KERN_DEBUG "usbip_xmit: receiving....\n");
537 usbip_dump_buffer(bp, osize);
538 printk(KERN_DEBUG "usbip_xmit: received, osize %d ret "
539 "%d size %d total %d\n", osize, result,
540 size, total);
541 }
542
543 if (send)
544 printk(KERN_DEBUG "usbip_xmit: send, total %d\n",
545 total);
546 }
547
548 return total;
549
550 err:
551 return result;
552 }
553 EXPORT_SYMBOL_GPL(usbip_xmit);
554
555 struct socket *sockfd_to_socket(unsigned int sockfd)
556 {
557 struct socket *socket;
558 struct file *file;
559 struct inode *inode;
560
561 file = fget(sockfd);
562 if (!file) {
563 printk(KERN_ERR "%s: invalid sockfd\n", __func__);
564 return NULL;
565 }
566
567 inode = file->f_dentry->d_inode;
568
569 if (!inode || !S_ISSOCK(inode->i_mode))
570 return NULL;
571
572 socket = SOCKET_I(inode);
573
574 return socket;
575 }
576 EXPORT_SYMBOL_GPL(sockfd_to_socket);
577
578
579
580 /*-------------------------------------------------------------------------*/
581 /* pdu routines */
582
583 /* there may be more cases to tweak the flags. */
584 static unsigned int tweak_transfer_flags(unsigned int flags)
585 {
586 flags &= ~URB_NO_TRANSFER_DMA_MAP;
587 return flags;
588 }
589
590 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
591 int pack)
592 {
593 struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
594
595 /*
596 * Some members are not still implemented in usbip. I hope this issue
597 * will be discussed when usbip is ported to other operating systems.
598 */
599 if (pack) {
600 /* vhci_tx.c */
601 spdu->transfer_flags =
602 tweak_transfer_flags(urb->transfer_flags);
603 spdu->transfer_buffer_length = urb->transfer_buffer_length;
604 spdu->start_frame = urb->start_frame;
605 spdu->number_of_packets = urb->number_of_packets;
606 spdu->interval = urb->interval;
607 } else {
608 /* stub_rx.c */
609 urb->transfer_flags = spdu->transfer_flags;
610
611 urb->transfer_buffer_length = spdu->transfer_buffer_length;
612 urb->start_frame = spdu->start_frame;
613 urb->number_of_packets = spdu->number_of_packets;
614 urb->interval = spdu->interval;
615 }
616 }
617
618 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
619 int pack)
620 {
621 struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
622
623 if (pack) {
624 /* stub_tx.c */
625
626 rpdu->status = urb->status;
627 rpdu->actual_length = urb->actual_length;
628 rpdu->start_frame = urb->start_frame;
629 rpdu->number_of_packets = urb->number_of_packets;
630 rpdu->error_count = urb->error_count;
631 } else {
632 /* vhci_rx.c */
633
634 urb->status = rpdu->status;
635 urb->actual_length = rpdu->actual_length;
636 urb->start_frame = rpdu->start_frame;
637 urb->number_of_packets = rpdu->number_of_packets;
638 urb->error_count = rpdu->error_count;
639 }
640 }
641
642
643 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
644 int pack)
645 {
646 switch (cmd) {
647 case USBIP_CMD_SUBMIT:
648 usbip_pack_cmd_submit(pdu, urb, pack);
649 break;
650 case USBIP_RET_SUBMIT:
651 usbip_pack_ret_submit(pdu, urb, pack);
652 break;
653 default:
654 err("unknown command");
655 /* NOTREACHED */
656 /* BUG(); */
657 }
658 }
659 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
660
661
662 static void correct_endian_basic(struct usbip_header_basic *base, int send)
663 {
664 if (send) {
665 base->command = cpu_to_be32(base->command);
666 base->seqnum = cpu_to_be32(base->seqnum);
667 base->devid = cpu_to_be32(base->devid);
668 base->direction = cpu_to_be32(base->direction);
669 base->ep = cpu_to_be32(base->ep);
670 } else {
671 base->command = be32_to_cpu(base->command);
672 base->seqnum = be32_to_cpu(base->seqnum);
673 base->devid = be32_to_cpu(base->devid);
674 base->direction = be32_to_cpu(base->direction);
675 base->ep = be32_to_cpu(base->ep);
676 }
677 }
678
679 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
680 int send)
681 {
682 if (send) {
683 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
684
685 cpu_to_be32s(&pdu->transfer_buffer_length);
686 cpu_to_be32s(&pdu->start_frame);
687 cpu_to_be32s(&pdu->number_of_packets);
688 cpu_to_be32s(&pdu->interval);
689 } else {
690 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
691
692 be32_to_cpus(&pdu->transfer_buffer_length);
693 be32_to_cpus(&pdu->start_frame);
694 be32_to_cpus(&pdu->number_of_packets);
695 be32_to_cpus(&pdu->interval);
696 }
697 }
698
699 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
700 int send)
701 {
702 if (send) {
703 cpu_to_be32s(&pdu->status);
704 cpu_to_be32s(&pdu->actual_length);
705 cpu_to_be32s(&pdu->start_frame);
706 cpu_to_be32s(&pdu->number_of_packets);
707 cpu_to_be32s(&pdu->error_count);
708 } else {
709 be32_to_cpus(&pdu->status);
710 be32_to_cpus(&pdu->actual_length);
711 be32_to_cpus(&pdu->start_frame);
712 be32_to_cpus(&pdu->number_of_packets);
713 be32_to_cpus(&pdu->error_count);
714 }
715 }
716
717 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
718 int send)
719 {
720 if (send)
721 pdu->seqnum = cpu_to_be32(pdu->seqnum);
722 else
723 pdu->seqnum = be32_to_cpu(pdu->seqnum);
724 }
725
726 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
727 int send)
728 {
729 if (send)
730 cpu_to_be32s(&pdu->status);
731 else
732 be32_to_cpus(&pdu->status);
733 }
734
735 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
736 {
737 __u32 cmd = 0;
738
739 if (send)
740 cmd = pdu->base.command;
741
742 correct_endian_basic(&pdu->base, send);
743
744 if (!send)
745 cmd = pdu->base.command;
746
747 switch (cmd) {
748 case USBIP_CMD_SUBMIT:
749 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
750 break;
751 case USBIP_RET_SUBMIT:
752 correct_endian_ret_submit(&pdu->u.ret_submit, send);
753 break;
754 case USBIP_CMD_UNLINK:
755 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
756 break;
757 case USBIP_RET_UNLINK:
758 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
759 break;
760 default:
761 /* NOTREACHED */
762 err("unknown command in pdu header: %d", cmd);
763 /* BUG(); */
764 }
765 }
766 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
767
768 static void usbip_iso_pakcet_correct_endian(
769 struct usbip_iso_packet_descriptor *iso,
770 int send)
771 {
772 /* does not need all members. but copy all simply. */
773 if (send) {
774 iso->offset = cpu_to_be32(iso->offset);
775 iso->length = cpu_to_be32(iso->length);
776 iso->status = cpu_to_be32(iso->status);
777 iso->actual_length = cpu_to_be32(iso->actual_length);
778 } else {
779 iso->offset = be32_to_cpu(iso->offset);
780 iso->length = be32_to_cpu(iso->length);
781 iso->status = be32_to_cpu(iso->status);
782 iso->actual_length = be32_to_cpu(iso->actual_length);
783 }
784 }
785
786 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
787 struct usb_iso_packet_descriptor *uiso, int pack)
788 {
789 if (pack) {
790 iso->offset = uiso->offset;
791 iso->length = uiso->length;
792 iso->status = uiso->status;
793 iso->actual_length = uiso->actual_length;
794 } else {
795 uiso->offset = iso->offset;
796 uiso->length = iso->length;
797 uiso->status = iso->status;
798 uiso->actual_length = iso->actual_length;
799 }
800 }
801
802
803 /* must free buffer */
804 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
805 {
806 void *buff;
807 struct usbip_iso_packet_descriptor *iso;
808 int np = urb->number_of_packets;
809 ssize_t size = np * sizeof(*iso);
810 int i;
811
812 buff = kzalloc(size, GFP_KERNEL);
813 if (!buff)
814 return NULL;
815
816 for (i = 0; i < np; i++) {
817 iso = buff + (i * sizeof(*iso));
818
819 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
820 usbip_iso_pakcet_correct_endian(iso, 1);
821 }
822
823 *bufflen = size;
824
825 return buff;
826 }
827 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
828
829 /* some members of urb must be substituted before. */
830 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
831 {
832 void *buff;
833 struct usbip_iso_packet_descriptor *iso;
834 int np = urb->number_of_packets;
835 int size = np * sizeof(*iso);
836 int i;
837 int ret;
838 int total_length = 0;
839
840 if (!usb_pipeisoc(urb->pipe))
841 return 0;
842
843 /* my Bluetooth dongle gets ISO URBs which are np = 0 */
844 if (np == 0) {
845 /* usbip_uinfo("iso np == 0\n"); */
846 /* usbip_dump_urb(urb); */
847 return 0;
848 }
849
850 buff = kzalloc(size, GFP_KERNEL);
851 if (!buff)
852 return -ENOMEM;
853
854 ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
855 if (ret != size) {
856 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
857 ret);
858 kfree(buff);
859
860 if (ud->side == USBIP_STUB)
861 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
862 else
863 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
864
865 return -EPIPE;
866 }
867
868
869 for (i = 0; i < np; i++) {
870 iso = buff + (i * sizeof(*iso));
871
872 usbip_iso_pakcet_correct_endian(iso, 0);
873 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
874 total_length += urb->iso_frame_desc[i].actual_length;
875 }
876
877 kfree(buff);
878
879 if (total_length != urb->actual_length) {
880 dev_err(&urb->dev->dev,
881 "total length of iso packets (%d) not equal to actual length of buffer (%d)\n",
882 total_length, urb->actual_length);
883
884 if (ud->side == USBIP_STUB)
885 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
886 else
887 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
888
889 return -EPIPE;
890 }
891
892 return ret;
893 }
894 EXPORT_SYMBOL_GPL(usbip_recv_iso);
895
896 /*
897 * This functions restores the padding which was removed for optimizing
898 * the bandwidth during transfer over tcp/ip
899 *
900 * buffer and iso packets need to be stored and be in propeper endian in urb
901 * before calling this function
902 */
903 int usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
904 {
905 int np = urb->number_of_packets;
906 int i;
907 int ret;
908 int actualoffset = urb->actual_length;
909
910 if (!usb_pipeisoc(urb->pipe))
911 return 0;
912
913 /* if no packets or length of data is 0, then nothing to unpack */
914 if (np == 0 || urb->actual_length == 0)
915 return 0;
916
917 /*
918 * if actual_length is transfer_buffer_length then no padding is
919 * present.
920 */
921 if (urb->actual_length == urb->transfer_buffer_length)
922 return 0;
923
924 /*
925 * loop over all packets from last to first (to prevent overwritting
926 * memory when padding) and move them into the proper place
927 */
928 for (i = np-1; i > 0; i--) {
929 actualoffset -= urb->iso_frame_desc[i].actual_length;
930 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
931 urb->transfer_buffer + actualoffset,
932 urb->iso_frame_desc[i].actual_length);
933 }
934 return ret;
935 }
936 EXPORT_SYMBOL_GPL(usbip_pad_iso);
937
938 /* some members of urb must be substituted before. */
939 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
940 {
941 int ret;
942 int size;
943
944 if (ud->side == USBIP_STUB) {
945 /* stub_rx.c */
946 /* the direction of urb must be OUT. */
947 if (usb_pipein(urb->pipe))
948 return 0;
949
950 size = urb->transfer_buffer_length;
951 } else {
952 /* vhci_rx.c */
953 /* the direction of urb must be IN. */
954 if (usb_pipeout(urb->pipe))
955 return 0;
956
957 size = urb->actual_length;
958 }
959
960 /* no need to recv xbuff */
961 if (!(size > 0))
962 return 0;
963
964 ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
965 size, 0);
966 if (ret != size) {
967 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
968 if (ud->side == USBIP_STUB) {
969 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
970 } else {
971 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
972 return -EPIPE;
973 }
974 }
975
976 return ret;
977 }
978 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
979
980
981 /*-------------------------------------------------------------------------*/
982
983 static int __init usbip_common_init(void)
984 {
985 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "" DRIVER_VERSION);
986
987 return 0;
988 }
989
990 static void __exit usbip_common_exit(void)
991 {
992 return;
993 }
994
995
996
997
998 module_init(usbip_common_init);
999 module_exit(usbip_common_exit);
1000
1001 MODULE_AUTHOR(DRIVER_AUTHOR);
1002 MODULE_DESCRIPTION(DRIVER_DESC);
1003 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree