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Merge 3.2-rc3 into usb-linus
[zen-stable.git] / drivers / staging / usbip / usbip_common.c
blob3b7a847f4657c38f6db0a42a3db80a1afac9843e
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 <asm/byteorder.h>
21 #include <linux/file.h>
22 #include <linux/fs.h>
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <net/sock.h>
27
28 #include "usbip_common.h"
29
30 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>"
31 #define DRIVER_DESC "USB/IP Core"
32
33 #ifdef CONFIG_USBIP_DEBUG
34 unsigned long usbip_debug_flag = 0xffffffff;
35 #else
36 unsigned long usbip_debug_flag;
37 #endif
38 EXPORT_SYMBOL_GPL(usbip_debug_flag);
39
40 /* FIXME */
41 struct device_attribute dev_attr_usbip_debug;
42 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
43
44 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
45 char *buf)
46 {
47 return sprintf(buf, "%lx\n", usbip_debug_flag);
48 }
49
50 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
51 const char *buf, size_t count)
52 {
53 sscanf(buf, "%lx", &usbip_debug_flag);
54 return count;
55 }
56 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
57
58 static void usbip_dump_buffer(char *buff, int bufflen)
59 {
60 print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
61 buff, bufflen, false);
62 }
63
64 static void usbip_dump_pipe(unsigned int p)
65 {
66 unsigned char type = usb_pipetype(p);
67 unsigned char ep = usb_pipeendpoint(p);
68 unsigned char dev = usb_pipedevice(p);
69 unsigned char dir = usb_pipein(p);
70
71 pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");
72
73 switch (type) {
74 case PIPE_ISOCHRONOUS:
75 pr_debug("ISO\n");
76 break;
77 case PIPE_INTERRUPT:
78 pr_debug("INT\n");
79 break;
80 case PIPE_CONTROL:
81 pr_debug("CTRL\n");
82 break;
83 case PIPE_BULK:
84 pr_debug("BULK\n");
85 break;
86 default:
87 pr_debug("ERR\n");
88 break;
89 }
90 }
91
92 static void usbip_dump_usb_device(struct usb_device *udev)
93 {
94 struct device *dev = &udev->dev;
95 int i;
96
97 dev_dbg(dev, " devnum(%d) devpath(%s) ",
98 udev->devnum, udev->devpath);
99
100 switch (udev->speed) {
101 case USB_SPEED_HIGH:
102 pr_debug("SPD_HIGH ");
103 break;
104 case USB_SPEED_FULL:
105 pr_debug("SPD_FULL ");
106 break;
107 case USB_SPEED_LOW:
108 pr_debug("SPD_LOW ");
109 break;
110 case USB_SPEED_UNKNOWN:
111 pr_debug("SPD_UNKNOWN ");
112 break;
113 default:
114 pr_debug("SPD_ERROR ");
115 break;
116 }
117
118 pr_debug("tt %p, ttport %d\n", udev->tt, udev->ttport);
119
120 dev_dbg(dev, " ");
121 for (i = 0; i < 16; i++)
122 pr_debug(" %2u", i);
123 pr_debug("\n");
124
125 dev_dbg(dev, " toggle0(IN) :");
126 for (i = 0; i < 16; i++)
127 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
128 pr_debug("\n");
129
130 dev_dbg(dev, " toggle1(OUT):");
131 for (i = 0; i < 16; i++)
132 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
133 pr_debug("\n");
134
135 dev_dbg(dev, " epmaxp_in :");
136 for (i = 0; i < 16; i++) {
137 if (udev->ep_in[i])
138 pr_debug(" %2u",
139 le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
140 }
141 pr_debug("\n");
142
143 dev_dbg(dev, " epmaxp_out :");
144 for (i = 0; i < 16; i++) {
145 if (udev->ep_out[i])
146 pr_debug(" %2u",
147 le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
148 }
149 pr_debug("\n");
150
151 dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
152
153 dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
154 "rawdescriptors %p\n", &udev->descriptor, udev->config,
155 udev->actconfig, udev->rawdescriptors);
156
157 dev_dbg(dev, "have_langid %d, string_langid %d\n",
158 udev->have_langid, udev->string_langid);
159
160 dev_dbg(dev, "maxchild %d, children %p\n",
161 udev->maxchild, udev->children);
162 }
163
164 static void usbip_dump_request_type(__u8 rt)
165 {
166 switch (rt & USB_RECIP_MASK) {
167 case USB_RECIP_DEVICE:
168 pr_debug("DEVICE");
169 break;
170 case USB_RECIP_INTERFACE:
171 pr_debug("INTERF");
172 break;
173 case USB_RECIP_ENDPOINT:
174 pr_debug("ENDPOI");
175 break;
176 case USB_RECIP_OTHER:
177 pr_debug("OTHER ");
178 break;
179 default:
180 pr_debug("------");
181 break;
182 }
183 }
184
185 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
186 {
187 if (!cmd) {
188 pr_debug(" : null pointer\n");
189 return;
190 }
191
192 pr_debug(" ");
193 pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) "
194 "wLength(%04X) ", cmd->bRequestType, cmd->bRequest,
195 cmd->wValue, cmd->wIndex, cmd->wLength);
196 pr_debug("\n ");
197
198 if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
199 pr_debug("STANDARD ");
200 switch (cmd->bRequest) {
201 case USB_REQ_GET_STATUS:
202 pr_debug("GET_STATUS\n");
203 break;
204 case USB_REQ_CLEAR_FEATURE:
205 pr_debug("CLEAR_FEAT\n");
206 break;
207 case USB_REQ_SET_FEATURE:
208 pr_debug("SET_FEAT\n");
209 break;
210 case USB_REQ_SET_ADDRESS:
211 pr_debug("SET_ADDRRS\n");
212 break;
213 case USB_REQ_GET_DESCRIPTOR:
214 pr_debug("GET_DESCRI\n");
215 break;
216 case USB_REQ_SET_DESCRIPTOR:
217 pr_debug("SET_DESCRI\n");
218 break;
219 case USB_REQ_GET_CONFIGURATION:
220 pr_debug("GET_CONFIG\n");
221 break;
222 case USB_REQ_SET_CONFIGURATION:
223 pr_debug("SET_CONFIG\n");
224 break;
225 case USB_REQ_GET_INTERFACE:
226 pr_debug("GET_INTERF\n");
227 break;
228 case USB_REQ_SET_INTERFACE:
229 pr_debug("SET_INTERF\n");
230 break;
231 case USB_REQ_SYNCH_FRAME:
232 pr_debug("SYNC_FRAME\n");
233 break;
234 default:
235 pr_debug("REQ(%02X)\n", cmd->bRequest);
236 break;
237 }
238 usbip_dump_request_type(cmd->bRequestType);
239 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
240 pr_debug("CLASS\n");
241 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
242 pr_debug("VENDOR\n");
243 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
244 pr_debug("RESERVED\n");
245 }
246 }
247
248 void usbip_dump_urb(struct urb *urb)
249 {
250 struct device *dev;
251
252 if (!urb) {
253 pr_debug("urb: null pointer!!\n");
254 return;
255 }
256
257 if (!urb->dev) {
258 pr_debug("urb->dev: null pointer!!\n");
259 return;
260 }
261
262 dev = &urb->dev->dev;
263
264 dev_dbg(dev, " urb :%p\n", urb);
265 dev_dbg(dev, " dev :%p\n", urb->dev);
266
267 usbip_dump_usb_device(urb->dev);
268
269 dev_dbg(dev, " pipe :%08x ", urb->pipe);
270
271 usbip_dump_pipe(urb->pipe);
272
273 dev_dbg(dev, " status :%d\n", urb->status);
274 dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags);
275 dev_dbg(dev, " transfer_buffer :%p\n", urb->transfer_buffer);
276 dev_dbg(dev, " transfer_buffer_length:%d\n",
277 urb->transfer_buffer_length);
278 dev_dbg(dev, " actual_length :%d\n", urb->actual_length);
279 dev_dbg(dev, " setup_packet :%p\n", urb->setup_packet);
280
281 if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
282 usbip_dump_usb_ctrlrequest(
283 (struct usb_ctrlrequest *)urb->setup_packet);
284
285 dev_dbg(dev, " start_frame :%d\n", urb->start_frame);
286 dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets);
287 dev_dbg(dev, " interval :%d\n", urb->interval);
288 dev_dbg(dev, " error_count :%d\n", urb->error_count);
289 dev_dbg(dev, " context :%p\n", urb->context);
290 dev_dbg(dev, " complete :%p\n", urb->complete);
291 }
292 EXPORT_SYMBOL_GPL(usbip_dump_urb);
293
294 void usbip_dump_header(struct usbip_header *pdu)
295 {
296 pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
297 pdu->base.command,
298 pdu->base.seqnum,
299 pdu->base.devid,
300 pdu->base.direction,
301 pdu->base.ep);
302
303 switch (pdu->base.command) {
304 case USBIP_CMD_SUBMIT:
305 pr_debug("USBIP_CMD_SUBMIT: "
306 "x_flags %u x_len %u sf %u #p %d iv %d\n",
307 pdu->u.cmd_submit.transfer_flags,
308 pdu->u.cmd_submit.transfer_buffer_length,
309 pdu->u.cmd_submit.start_frame,
310 pdu->u.cmd_submit.number_of_packets,
311 pdu->u.cmd_submit.interval);
312 break;
313 case USBIP_CMD_UNLINK:
314 pr_debug("USBIP_CMD_UNLINK: seq %u\n",
315 pdu->u.cmd_unlink.seqnum);
316 break;
317 case USBIP_RET_SUBMIT:
318 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
319 pdu->u.ret_submit.status,
320 pdu->u.ret_submit.actual_length,
321 pdu->u.ret_submit.start_frame,
322 pdu->u.ret_submit.number_of_packets,
323 pdu->u.ret_submit.error_count);
324 break;
325 case USBIP_RET_UNLINK:
326 pr_debug("USBIP_RET_UNLINK: status %d\n",
327 pdu->u.ret_unlink.status);
328 break;
329 default:
330 /* NOT REACHED */
331 pr_err("unknown command\n");
332 break;
333 }
334 }
335 EXPORT_SYMBOL_GPL(usbip_dump_header);
336
337 /* Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
338 int usbip_xmit(int send, struct socket *sock, char *buf, int size,
339 int msg_flags)
340 {
341 int result;
342 struct msghdr msg;
343 struct kvec iov;
344 int total = 0;
345
346 /* for blocks of if (usbip_dbg_flag_xmit) */
347 char *bp = buf;
348 int osize = size;
349
350 usbip_dbg_xmit("enter\n");
351
352 if (!sock || !buf || !size) {
353 pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
354 size);
355 return -EINVAL;
356 }
357
358 if (usbip_dbg_flag_xmit) {
359 if (send) {
360 if (!in_interrupt())
361 pr_debug("%-10s:", current->comm);
362 else
363 pr_debug("interrupt :");
364
365 pr_debug("sending... , sock %p, buf %p, size %d, "
366 "msg_flags %d\n", sock, buf, size, msg_flags);
367 usbip_dump_buffer(buf, size);
368 }
369 }
370
371 do {
372 sock->sk->sk_allocation = GFP_NOIO;
373 iov.iov_base = buf;
374 iov.iov_len = size;
375 msg.msg_name = NULL;
376 msg.msg_namelen = 0;
377 msg.msg_control = NULL;
378 msg.msg_controllen = 0;
379 msg.msg_namelen = 0;
380 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
381
382 if (send)
383 result = kernel_sendmsg(sock, &msg, &iov, 1, size);
384 else
385 result = kernel_recvmsg(sock, &msg, &iov, 1, size,
386 MSG_WAITALL);
387
388 if (result <= 0) {
389 pr_debug("%s sock %p buf %p size %u ret %d total %d\n",
390 send ? "send" : "receive", sock, buf, size,
391 result, total);
392 goto err;
393 }
394
395 size -= result;
396 buf += result;
397 total += result;
398
399 } while (size > 0);
400
401 if (usbip_dbg_flag_xmit) {
402 if (!send) {
403 if (!in_interrupt())
404 pr_debug("%-10s:", current->comm);
405 else
406 pr_debug("interrupt :");
407
408 pr_debug("receiving....\n");
409 usbip_dump_buffer(bp, osize);
410 pr_debug("received, osize %d ret %d size %d total %d\n",
411 osize, result, size, total);
412 }
413
414 if (send)
415 pr_debug("send, total %d\n", total);
416 }
417
418 return total;
419
420 err:
421 return result;
422 }
423 EXPORT_SYMBOL_GPL(usbip_xmit);
424
425 struct socket *sockfd_to_socket(unsigned int sockfd)
426 {
427 struct socket *socket;
428 struct file *file;
429 struct inode *inode;
430
431 file = fget(sockfd);
432 if (!file) {
433 pr_err("invalid sockfd\n");
434 return NULL;
435 }
436
437 inode = file->f_dentry->d_inode;
438
439 if (!inode || !S_ISSOCK(inode->i_mode))
440 return NULL;
441
442 socket = SOCKET_I(inode);
443
444 return socket;
445 }
446 EXPORT_SYMBOL_GPL(sockfd_to_socket);
447
448 /* there may be more cases to tweak the flags. */
449 static unsigned int tweak_transfer_flags(unsigned int flags)
450 {
451 flags &= ~URB_NO_TRANSFER_DMA_MAP;
452 return flags;
453 }
454
455 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
456 int pack)
457 {
458 struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
459
460 /*
461 * Some members are not still implemented in usbip. I hope this issue
462 * will be discussed when usbip is ported to other operating systems.
463 */
464 if (pack) {
465 /* vhci_tx.c */
466 spdu->transfer_flags =
467 tweak_transfer_flags(urb->transfer_flags);
468 spdu->transfer_buffer_length = urb->transfer_buffer_length;
469 spdu->start_frame = urb->start_frame;
470 spdu->number_of_packets = urb->number_of_packets;
471 spdu->interval = urb->interval;
472 } else {
473 /* stub_rx.c */
474 urb->transfer_flags = spdu->transfer_flags;
475
476 urb->transfer_buffer_length = spdu->transfer_buffer_length;
477 urb->start_frame = spdu->start_frame;
478 urb->number_of_packets = spdu->number_of_packets;
479 urb->interval = spdu->interval;
480 }
481 }
482
483 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
484 int pack)
485 {
486 struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
487
488 if (pack) {
489 /* stub_tx.c */
490
491 rpdu->status = urb->status;
492 rpdu->actual_length = urb->actual_length;
493 rpdu->start_frame = urb->start_frame;
494 rpdu->number_of_packets = urb->number_of_packets;
495 rpdu->error_count = urb->error_count;
496 } else {
497 /* vhci_rx.c */
498
499 urb->status = rpdu->status;
500 urb->actual_length = rpdu->actual_length;
501 urb->start_frame = rpdu->start_frame;
502 urb->number_of_packets = rpdu->number_of_packets;
503 urb->error_count = rpdu->error_count;
504 }
505 }
506
507 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
508 int pack)
509 {
510 switch (cmd) {
511 case USBIP_CMD_SUBMIT:
512 usbip_pack_cmd_submit(pdu, urb, pack);
513 break;
514 case USBIP_RET_SUBMIT:
515 usbip_pack_ret_submit(pdu, urb, pack);
516 break;
517 default:
518 /* NOT REACHED */
519 pr_err("unknown command\n");
520 break;
521 }
522 }
523 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
524
525 static void correct_endian_basic(struct usbip_header_basic *base, int send)
526 {
527 if (send) {
528 base->command = cpu_to_be32(base->command);
529 base->seqnum = cpu_to_be32(base->seqnum);
530 base->devid = cpu_to_be32(base->devid);
531 base->direction = cpu_to_be32(base->direction);
532 base->ep = cpu_to_be32(base->ep);
533 } else {
534 base->command = be32_to_cpu(base->command);
535 base->seqnum = be32_to_cpu(base->seqnum);
536 base->devid = be32_to_cpu(base->devid);
537 base->direction = be32_to_cpu(base->direction);
538 base->ep = be32_to_cpu(base->ep);
539 }
540 }
541
542 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
543 int send)
544 {
545 if (send) {
546 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
547
548 cpu_to_be32s(&pdu->transfer_buffer_length);
549 cpu_to_be32s(&pdu->start_frame);
550 cpu_to_be32s(&pdu->number_of_packets);
551 cpu_to_be32s(&pdu->interval);
552 } else {
553 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
554
555 be32_to_cpus(&pdu->transfer_buffer_length);
556 be32_to_cpus(&pdu->start_frame);
557 be32_to_cpus(&pdu->number_of_packets);
558 be32_to_cpus(&pdu->interval);
559 }
560 }
561
562 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
563 int send)
564 {
565 if (send) {
566 cpu_to_be32s(&pdu->status);
567 cpu_to_be32s(&pdu->actual_length);
568 cpu_to_be32s(&pdu->start_frame);
569 cpu_to_be32s(&pdu->number_of_packets);
570 cpu_to_be32s(&pdu->error_count);
571 } else {
572 be32_to_cpus(&pdu->status);
573 be32_to_cpus(&pdu->actual_length);
574 be32_to_cpus(&pdu->start_frame);
575 be32_to_cpus(&pdu->number_of_packets);
576 be32_to_cpus(&pdu->error_count);
577 }
578 }
579
580 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
581 int send)
582 {
583 if (send)
584 pdu->seqnum = cpu_to_be32(pdu->seqnum);
585 else
586 pdu->seqnum = be32_to_cpu(pdu->seqnum);
587 }
588
589 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
590 int send)
591 {
592 if (send)
593 cpu_to_be32s(&pdu->status);
594 else
595 be32_to_cpus(&pdu->status);
596 }
597
598 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
599 {
600 __u32 cmd = 0;
601
602 if (send)
603 cmd = pdu->base.command;
604
605 correct_endian_basic(&pdu->base, send);
606
607 if (!send)
608 cmd = pdu->base.command;
609
610 switch (cmd) {
611 case USBIP_CMD_SUBMIT:
612 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
613 break;
614 case USBIP_RET_SUBMIT:
615 correct_endian_ret_submit(&pdu->u.ret_submit, send);
616 break;
617 case USBIP_CMD_UNLINK:
618 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
619 break;
620 case USBIP_RET_UNLINK:
621 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
622 break;
623 default:
624 /* NOT REACHED */
625 pr_err("unknown command\n");
626 break;
627 }
628 }
629 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
630
631 static void usbip_iso_packet_correct_endian(
632 struct usbip_iso_packet_descriptor *iso, int send)
633 {
634 /* does not need all members. but copy all simply. */
635 if (send) {
636 iso->offset = cpu_to_be32(iso->offset);
637 iso->length = cpu_to_be32(iso->length);
638 iso->status = cpu_to_be32(iso->status);
639 iso->actual_length = cpu_to_be32(iso->actual_length);
640 } else {
641 iso->offset = be32_to_cpu(iso->offset);
642 iso->length = be32_to_cpu(iso->length);
643 iso->status = be32_to_cpu(iso->status);
644 iso->actual_length = be32_to_cpu(iso->actual_length);
645 }
646 }
647
648 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
649 struct usb_iso_packet_descriptor *uiso, int pack)
650 {
651 if (pack) {
652 iso->offset = uiso->offset;
653 iso->length = uiso->length;
654 iso->status = uiso->status;
655 iso->actual_length = uiso->actual_length;
656 } else {
657 uiso->offset = iso->offset;
658 uiso->length = iso->length;
659 uiso->status = iso->status;
660 uiso->actual_length = iso->actual_length;
661 }
662 }
663
664 /* must free buffer */
665 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
666 {
667 void *buff;
668 struct usbip_iso_packet_descriptor *iso;
669 int np = urb->number_of_packets;
670 ssize_t size = np * sizeof(*iso);
671 int i;
672
673 buff = kzalloc(size, GFP_KERNEL);
674 if (!buff)
675 return NULL;
676
677 for (i = 0; i < np; i++) {
678 iso = buff + (i * sizeof(*iso));
679
680 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
681 usbip_iso_packet_correct_endian(iso, 1);
682 }
683
684 *bufflen = size;
685
686 return buff;
687 }
688 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
689
690 /* some members of urb must be substituted before. */
691 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
692 {
693 void *buff;
694 struct usbip_iso_packet_descriptor *iso;
695 int np = urb->number_of_packets;
696 int size = np * sizeof(*iso);
697 int i;
698 int ret;
699 int total_length = 0;
700
701 if (!usb_pipeisoc(urb->pipe))
702 return 0;
703
704 /* my Bluetooth dongle gets ISO URBs which are np = 0 */
705 if (np == 0) {
706 /* pr_info("iso np == 0\n"); */
707 /* usbip_dump_urb(urb); */
708 return 0;
709 }
710
711 buff = kzalloc(size, GFP_KERNEL);
712 if (!buff)
713 return -ENOMEM;
714
715 ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
716 if (ret != size) {
717 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
718 ret);
719 kfree(buff);
720
721 if (ud->side == USBIP_STUB)
722 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
723 else
724 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
725
726 return -EPIPE;
727 }
728
729 for (i = 0; i < np; i++) {
730 iso = buff + (i * sizeof(*iso));
731
732 usbip_iso_packet_correct_endian(iso, 0);
733 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
734 total_length += urb->iso_frame_desc[i].actual_length;
735 }
736
737 kfree(buff);
738
739 if (total_length != urb->actual_length) {
740 dev_err(&urb->dev->dev,
741 "total length of iso packets %d not equal to actual "
742 "length of buffer %d\n",
743 total_length, urb->actual_length);
744
745 if (ud->side == USBIP_STUB)
746 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
747 else
748 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
749
750 return -EPIPE;
751 }
752
753 return ret;
754 }
755 EXPORT_SYMBOL_GPL(usbip_recv_iso);
756
757 /*
758 * This functions restores the padding which was removed for optimizing
759 * the bandwidth during transfer over tcp/ip
760 *
761 * buffer and iso packets need to be stored and be in propeper endian in urb
762 * before calling this function
763 */
764 int usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
765 {
766 int np = urb->number_of_packets;
767 int i;
768 int ret;
769 int actualoffset = urb->actual_length;
770
771 if (!usb_pipeisoc(urb->pipe))
772 return 0;
773
774 /* if no packets or length of data is 0, then nothing to unpack */
775 if (np == 0 || urb->actual_length == 0)
776 return 0;
777
778 /*
779 * if actual_length is transfer_buffer_length then no padding is
780 * present.
781 */
782 if (urb->actual_length == urb->transfer_buffer_length)
783 return 0;
784
785 /*
786 * loop over all packets from last to first (to prevent overwritting
787 * memory when padding) and move them into the proper place
788 */
789 for (i = np-1; i > 0; i--) {
790 actualoffset -= urb->iso_frame_desc[i].actual_length;
791 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
792 urb->transfer_buffer + actualoffset,
793 urb->iso_frame_desc[i].actual_length);
794 }
795
796 return ret;
797 }
798 EXPORT_SYMBOL_GPL(usbip_pad_iso);
799
800 /* some members of urb must be substituted before. */
801 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
802 {
803 int ret;
804 int size;
805
806 if (ud->side == USBIP_STUB) {
807 /* stub_rx.c */
808 /* the direction of urb must be OUT. */
809 if (usb_pipein(urb->pipe))
810 return 0;
811
812 size = urb->transfer_buffer_length;
813 } else {
814 /* vhci_rx.c */
815 /* the direction of urb must be IN. */
816 if (usb_pipeout(urb->pipe))
817 return 0;
818
819 size = urb->actual_length;
820 }
821
822 /* no need to recv xbuff */
823 if (!(size > 0))
824 return 0;
825
826 ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
827 size, 0);
828 if (ret != size) {
829 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
830 if (ud->side == USBIP_STUB) {
831 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
832 } else {
833 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
834 return -EPIPE;
835 }
836 }
837
838 return ret;
839 }
840 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
841
842 static int __init usbip_core_init(void)
843 {
844 pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
845 return 0;
846 }
847
848 static void __exit usbip_core_exit(void)
849 {
850 return;
851 }
852
853 module_init(usbip_core_init);
854 module_exit(usbip_core_exit);
855
856 MODULE_AUTHOR(DRIVER_AUTHOR);
857 MODULE_DESCRIPTION(DRIVER_DESC);
858 MODULE_LICENSE("GPL");
859 MODULE_VERSION(USBIP_VERSION);