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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / drivers / staging / usbip / usbip_common.c
blobf4b53d103c54e8533f487c5467e05ed7cd79d8cb
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 <net/sock.h>
26
27 #include "usbip_common.h"
28
29 #define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>"
30 #define DRIVER_DESC "USB/IP Core"
31
32 #ifdef CONFIG_USBIP_DEBUG
33 unsigned long usbip_debug_flag = 0xffffffff;
34 #else
35 unsigned long usbip_debug_flag;
36 #endif
37 EXPORT_SYMBOL_GPL(usbip_debug_flag);
38
39 /* FIXME */
40 struct device_attribute dev_attr_usbip_debug;
41 EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
42
43 static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
44 char *buf)
45 {
46 return sprintf(buf, "%lx\n", usbip_debug_flag);
47 }
48
49 static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
50 const char *buf, size_t count)
51 {
52 sscanf(buf, "%lx", &usbip_debug_flag);
53 return count;
54 }
55 DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
56
57 static void usbip_dump_buffer(char *buff, int bufflen)
58 {
59 print_hex_dump(KERN_DEBUG, "usbip-core", DUMP_PREFIX_OFFSET, 16, 4,
60 buff, bufflen, false);
61 }
62
63 static void usbip_dump_pipe(unsigned int p)
64 {
65 unsigned char type = usb_pipetype(p);
66 unsigned char ep = usb_pipeendpoint(p);
67 unsigned char dev = usb_pipedevice(p);
68 unsigned char dir = usb_pipein(p);
69
70 pr_debug("dev(%d) ep(%d) [%s] ", dev, ep, dir ? "IN" : "OUT");
71
72 switch (type) {
73 case PIPE_ISOCHRONOUS:
74 pr_debug("ISO\n");
75 break;
76 case PIPE_INTERRUPT:
77 pr_debug("INT\n");
78 break;
79 case PIPE_CONTROL:
80 pr_debug("CTRL\n");
81 break;
82 case PIPE_BULK:
83 pr_debug("BULK\n");
84 break;
85 default:
86 pr_debug("ERR\n");
87 break;
88 }
89 }
90
91 static void usbip_dump_usb_device(struct usb_device *udev)
92 {
93 struct device *dev = &udev->dev;
94 int i;
95
96 dev_dbg(dev, " devnum(%d) devpath(%s) ",
97 udev->devnum, udev->devpath);
98
99 switch (udev->speed) {
100 case USB_SPEED_HIGH:
101 pr_debug("SPD_HIGH ");
102 break;
103 case USB_SPEED_FULL:
104 pr_debug("SPD_FULL ");
105 break;
106 case USB_SPEED_LOW:
107 pr_debug("SPD_LOW ");
108 break;
109 case USB_SPEED_UNKNOWN:
110 pr_debug("SPD_UNKNOWN ");
111 break;
112 default:
113 pr_debug("SPD_ERROR ");
114 break;
115 }
116
117 pr_debug("tt %p, ttport %d\n", udev->tt, udev->ttport);
118
119 dev_dbg(dev, " ");
120 for (i = 0; i < 16; i++)
121 pr_debug(" %2u", i);
122 pr_debug("\n");
123
124 dev_dbg(dev, " toggle0(IN) :");
125 for (i = 0; i < 16; i++)
126 pr_debug(" %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
127 pr_debug("\n");
128
129 dev_dbg(dev, " toggle1(OUT):");
130 for (i = 0; i < 16; i++)
131 pr_debug(" %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
132 pr_debug("\n");
133
134 dev_dbg(dev, " epmaxp_in :");
135 for (i = 0; i < 16; i++) {
136 if (udev->ep_in[i])
137 pr_debug(" %2u",
138 le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
139 }
140 pr_debug("\n");
141
142 dev_dbg(dev, " epmaxp_out :");
143 for (i = 0; i < 16; i++) {
144 if (udev->ep_out[i])
145 pr_debug(" %2u",
146 le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
147 }
148 pr_debug("\n");
149
150 dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
151
152 dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
153 "rawdescriptors %p\n", &udev->descriptor, udev->config,
154 udev->actconfig, udev->rawdescriptors);
155
156 dev_dbg(dev, "have_langid %d, string_langid %d\n",
157 udev->have_langid, udev->string_langid);
158
159 dev_dbg(dev, "maxchild %d, children %p\n",
160 udev->maxchild, udev->children);
161 }
162
163 static void usbip_dump_request_type(__u8 rt)
164 {
165 switch (rt & USB_RECIP_MASK) {
166 case USB_RECIP_DEVICE:
167 pr_debug("DEVICE");
168 break;
169 case USB_RECIP_INTERFACE:
170 pr_debug("INTERF");
171 break;
172 case USB_RECIP_ENDPOINT:
173 pr_debug("ENDPOI");
174 break;
175 case USB_RECIP_OTHER:
176 pr_debug("OTHER ");
177 break;
178 default:
179 pr_debug("------");
180 break;
181 }
182 }
183
184 static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
185 {
186 if (!cmd) {
187 pr_debug(" : null pointer\n");
188 return;
189 }
190
191 pr_debug(" ");
192 pr_debug("bRequestType(%02X) bRequest(%02X) wValue(%04X) wIndex(%04X) "
193 "wLength(%04X) ", cmd->bRequestType, cmd->bRequest,
194 cmd->wValue, cmd->wIndex, cmd->wLength);
195 pr_debug("\n ");
196
197 if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
198 pr_debug("STANDARD ");
199 switch (cmd->bRequest) {
200 case USB_REQ_GET_STATUS:
201 pr_debug("GET_STATUS\n");
202 break;
203 case USB_REQ_CLEAR_FEATURE:
204 pr_debug("CLEAR_FEAT\n");
205 break;
206 case USB_REQ_SET_FEATURE:
207 pr_debug("SET_FEAT\n");
208 break;
209 case USB_REQ_SET_ADDRESS:
210 pr_debug("SET_ADDRRS\n");
211 break;
212 case USB_REQ_GET_DESCRIPTOR:
213 pr_debug("GET_DESCRI\n");
214 break;
215 case USB_REQ_SET_DESCRIPTOR:
216 pr_debug("SET_DESCRI\n");
217 break;
218 case USB_REQ_GET_CONFIGURATION:
219 pr_debug("GET_CONFIG\n");
220 break;
221 case USB_REQ_SET_CONFIGURATION:
222 pr_debug("SET_CONFIG\n");
223 break;
224 case USB_REQ_GET_INTERFACE:
225 pr_debug("GET_INTERF\n");
226 break;
227 case USB_REQ_SET_INTERFACE:
228 pr_debug("SET_INTERF\n");
229 break;
230 case USB_REQ_SYNCH_FRAME:
231 pr_debug("SYNC_FRAME\n");
232 break;
233 default:
234 pr_debug("REQ(%02X)\n", cmd->bRequest);
235 break;
236 }
237 usbip_dump_request_type(cmd->bRequestType);
238 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS) {
239 pr_debug("CLASS\n");
240 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR) {
241 pr_debug("VENDOR\n");
242 } else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED) {
243 pr_debug("RESERVED\n");
244 }
245 }
246
247 void usbip_dump_urb(struct urb *urb)
248 {
249 struct device *dev;
250
251 if (!urb) {
252 pr_debug("urb: null pointer!!\n");
253 return;
254 }
255
256 if (!urb->dev) {
257 pr_debug("urb->dev: null pointer!!\n");
258 return;
259 }
260
261 dev = &urb->dev->dev;
262
263 dev_dbg(dev, " urb :%p\n", urb);
264 dev_dbg(dev, " dev :%p\n", urb->dev);
265
266 usbip_dump_usb_device(urb->dev);
267
268 dev_dbg(dev, " pipe :%08x ", urb->pipe);
269
270 usbip_dump_pipe(urb->pipe);
271
272 dev_dbg(dev, " status :%d\n", urb->status);
273 dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags);
274 dev_dbg(dev, " transfer_buffer :%p\n", urb->transfer_buffer);
275 dev_dbg(dev, " transfer_buffer_length:%d\n",
276 urb->transfer_buffer_length);
277 dev_dbg(dev, " actual_length :%d\n", urb->actual_length);
278 dev_dbg(dev, " setup_packet :%p\n", urb->setup_packet);
279
280 if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
281 usbip_dump_usb_ctrlrequest(
282 (struct usb_ctrlrequest *)urb->setup_packet);
283
284 dev_dbg(dev, " start_frame :%d\n", urb->start_frame);
285 dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets);
286 dev_dbg(dev, " interval :%d\n", urb->interval);
287 dev_dbg(dev, " error_count :%d\n", urb->error_count);
288 dev_dbg(dev, " context :%p\n", urb->context);
289 dev_dbg(dev, " complete :%p\n", urb->complete);
290 }
291 EXPORT_SYMBOL_GPL(usbip_dump_urb);
292
293 void usbip_dump_header(struct usbip_header *pdu)
294 {
295 pr_debug("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
296 pdu->base.command,
297 pdu->base.seqnum,
298 pdu->base.devid,
299 pdu->base.direction,
300 pdu->base.ep);
301
302 switch (pdu->base.command) {
303 case USBIP_CMD_SUBMIT:
304 pr_debug("USBIP_CMD_SUBMIT: "
305 "x_flags %u x_len %u sf %u #p %d iv %d\n",
306 pdu->u.cmd_submit.transfer_flags,
307 pdu->u.cmd_submit.transfer_buffer_length,
308 pdu->u.cmd_submit.start_frame,
309 pdu->u.cmd_submit.number_of_packets,
310 pdu->u.cmd_submit.interval);
311 break;
312 case USBIP_CMD_UNLINK:
313 pr_debug("USBIP_CMD_UNLINK: seq %u\n",
314 pdu->u.cmd_unlink.seqnum);
315 break;
316 case USBIP_RET_SUBMIT:
317 pr_debug("USBIP_RET_SUBMIT: st %d al %u sf %d #p %d ec %d\n",
318 pdu->u.ret_submit.status,
319 pdu->u.ret_submit.actual_length,
320 pdu->u.ret_submit.start_frame,
321 pdu->u.ret_submit.number_of_packets,
322 pdu->u.ret_submit.error_count);
323 break;
324 case USBIP_RET_UNLINK:
325 pr_debug("USBIP_RET_UNLINK: status %d\n",
326 pdu->u.ret_unlink.status);
327 break;
328 default:
329 /* NOT REACHED */
330 pr_err("unknown command\n");
331 break;
332 }
333 }
334 EXPORT_SYMBOL_GPL(usbip_dump_header);
335
336 /* Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
337 int usbip_xmit(int send, struct socket *sock, char *buf, int size,
338 int msg_flags)
339 {
340 int result;
341 struct msghdr msg;
342 struct kvec iov;
343 int total = 0;
344
345 /* for blocks of if (usbip_dbg_flag_xmit) */
346 char *bp = buf;
347 int osize = size;
348
349 usbip_dbg_xmit("enter\n");
350
351 if (!sock || !buf || !size) {
352 pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
353 size);
354 return -EINVAL;
355 }
356
357 if (usbip_dbg_flag_xmit) {
358 if (send) {
359 if (!in_interrupt())
360 pr_debug("%-10s:", current->comm);
361 else
362 pr_debug("interrupt :");
363
364 pr_debug("sending... , sock %p, buf %p, size %d, "
365 "msg_flags %d\n", sock, buf, size, msg_flags);
366 usbip_dump_buffer(buf, size);
367 }
368 }
369
370 do {
371 sock->sk->sk_allocation = GFP_NOIO;
372 iov.iov_base = buf;
373 iov.iov_len = size;
374 msg.msg_name = NULL;
375 msg.msg_namelen = 0;
376 msg.msg_control = NULL;
377 msg.msg_controllen = 0;
378 msg.msg_namelen = 0;
379 msg.msg_flags = msg_flags | MSG_NOSIGNAL;
380
381 if (send)
382 result = kernel_sendmsg(sock, &msg, &iov, 1, size);
383 else
384 result = kernel_recvmsg(sock, &msg, &iov, 1, size,
385 MSG_WAITALL);
386
387 if (result <= 0) {
388 pr_debug("%s sock %p buf %p size %u ret %d total %d\n",
389 send ? "send" : "receive", sock, buf, size,
390 result, total);
391 goto err;
392 }
393
394 size -= result;
395 buf += result;
396 total += result;
397
398 } while (size > 0);
399
400 if (usbip_dbg_flag_xmit) {
401 if (!send) {
402 if (!in_interrupt())
403 pr_debug("%-10s:", current->comm);
404 else
405 pr_debug("interrupt :");
406
407 pr_debug("receiving....\n");
408 usbip_dump_buffer(bp, osize);
409 pr_debug("received, osize %d ret %d size %d total %d\n",
410 osize, result, size, total);
411 }
412
413 if (send)
414 pr_debug("send, total %d\n", total);
415 }
416
417 return total;
418
419 err:
420 return result;
421 }
422 EXPORT_SYMBOL_GPL(usbip_xmit);
423
424 struct socket *sockfd_to_socket(unsigned int sockfd)
425 {
426 struct socket *socket;
427 struct file *file;
428 struct inode *inode;
429
430 file = fget(sockfd);
431 if (!file) {
432 pr_err("invalid sockfd\n");
433 return NULL;
434 }
435
436 inode = file->f_dentry->d_inode;
437
438 if (!inode || !S_ISSOCK(inode->i_mode))
439 return NULL;
440
441 socket = SOCKET_I(inode);
442
443 return socket;
444 }
445 EXPORT_SYMBOL_GPL(sockfd_to_socket);
446
447 /* there may be more cases to tweak the flags. */
448 static unsigned int tweak_transfer_flags(unsigned int flags)
449 {
450 flags &= ~URB_NO_TRANSFER_DMA_MAP;
451 return flags;
452 }
453
454 static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
455 int pack)
456 {
457 struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
458
459 /*
460 * Some members are not still implemented in usbip. I hope this issue
461 * will be discussed when usbip is ported to other operating systems.
462 */
463 if (pack) {
464 /* vhci_tx.c */
465 spdu->transfer_flags =
466 tweak_transfer_flags(urb->transfer_flags);
467 spdu->transfer_buffer_length = urb->transfer_buffer_length;
468 spdu->start_frame = urb->start_frame;
469 spdu->number_of_packets = urb->number_of_packets;
470 spdu->interval = urb->interval;
471 } else {
472 /* stub_rx.c */
473 urb->transfer_flags = spdu->transfer_flags;
474
475 urb->transfer_buffer_length = spdu->transfer_buffer_length;
476 urb->start_frame = spdu->start_frame;
477 urb->number_of_packets = spdu->number_of_packets;
478 urb->interval = spdu->interval;
479 }
480 }
481
482 static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
483 int pack)
484 {
485 struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
486
487 if (pack) {
488 /* stub_tx.c */
489
490 rpdu->status = urb->status;
491 rpdu->actual_length = urb->actual_length;
492 rpdu->start_frame = urb->start_frame;
493 rpdu->number_of_packets = urb->number_of_packets;
494 rpdu->error_count = urb->error_count;
495 } else {
496 /* vhci_rx.c */
497
498 urb->status = rpdu->status;
499 urb->actual_length = rpdu->actual_length;
500 urb->start_frame = rpdu->start_frame;
501 urb->number_of_packets = rpdu->number_of_packets;
502 urb->error_count = rpdu->error_count;
503 }
504 }
505
506 void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
507 int pack)
508 {
509 switch (cmd) {
510 case USBIP_CMD_SUBMIT:
511 usbip_pack_cmd_submit(pdu, urb, pack);
512 break;
513 case USBIP_RET_SUBMIT:
514 usbip_pack_ret_submit(pdu, urb, pack);
515 break;
516 default:
517 /* NOT REACHED */
518 pr_err("unknown command\n");
519 break;
520 }
521 }
522 EXPORT_SYMBOL_GPL(usbip_pack_pdu);
523
524 static void correct_endian_basic(struct usbip_header_basic *base, int send)
525 {
526 if (send) {
527 base->command = cpu_to_be32(base->command);
528 base->seqnum = cpu_to_be32(base->seqnum);
529 base->devid = cpu_to_be32(base->devid);
530 base->direction = cpu_to_be32(base->direction);
531 base->ep = cpu_to_be32(base->ep);
532 } else {
533 base->command = be32_to_cpu(base->command);
534 base->seqnum = be32_to_cpu(base->seqnum);
535 base->devid = be32_to_cpu(base->devid);
536 base->direction = be32_to_cpu(base->direction);
537 base->ep = be32_to_cpu(base->ep);
538 }
539 }
540
541 static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
542 int send)
543 {
544 if (send) {
545 pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
546
547 cpu_to_be32s(&pdu->transfer_buffer_length);
548 cpu_to_be32s(&pdu->start_frame);
549 cpu_to_be32s(&pdu->number_of_packets);
550 cpu_to_be32s(&pdu->interval);
551 } else {
552 pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
553
554 be32_to_cpus(&pdu->transfer_buffer_length);
555 be32_to_cpus(&pdu->start_frame);
556 be32_to_cpus(&pdu->number_of_packets);
557 be32_to_cpus(&pdu->interval);
558 }
559 }
560
561 static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
562 int send)
563 {
564 if (send) {
565 cpu_to_be32s(&pdu->status);
566 cpu_to_be32s(&pdu->actual_length);
567 cpu_to_be32s(&pdu->start_frame);
568 cpu_to_be32s(&pdu->number_of_packets);
569 cpu_to_be32s(&pdu->error_count);
570 } else {
571 be32_to_cpus(&pdu->status);
572 be32_to_cpus(&pdu->actual_length);
573 be32_to_cpus(&pdu->start_frame);
574 be32_to_cpus(&pdu->number_of_packets);
575 be32_to_cpus(&pdu->error_count);
576 }
577 }
578
579 static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
580 int send)
581 {
582 if (send)
583 pdu->seqnum = cpu_to_be32(pdu->seqnum);
584 else
585 pdu->seqnum = be32_to_cpu(pdu->seqnum);
586 }
587
588 static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
589 int send)
590 {
591 if (send)
592 cpu_to_be32s(&pdu->status);
593 else
594 be32_to_cpus(&pdu->status);
595 }
596
597 void usbip_header_correct_endian(struct usbip_header *pdu, int send)
598 {
599 __u32 cmd = 0;
600
601 if (send)
602 cmd = pdu->base.command;
603
604 correct_endian_basic(&pdu->base, send);
605
606 if (!send)
607 cmd = pdu->base.command;
608
609 switch (cmd) {
610 case USBIP_CMD_SUBMIT:
611 correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
612 break;
613 case USBIP_RET_SUBMIT:
614 correct_endian_ret_submit(&pdu->u.ret_submit, send);
615 break;
616 case USBIP_CMD_UNLINK:
617 correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
618 break;
619 case USBIP_RET_UNLINK:
620 correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
621 break;
622 default:
623 /* NOT REACHED */
624 pr_err("unknown command\n");
625 break;
626 }
627 }
628 EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
629
630 static void usbip_iso_packet_correct_endian(
631 struct usbip_iso_packet_descriptor *iso, int send)
632 {
633 /* does not need all members. but copy all simply. */
634 if (send) {
635 iso->offset = cpu_to_be32(iso->offset);
636 iso->length = cpu_to_be32(iso->length);
637 iso->status = cpu_to_be32(iso->status);
638 iso->actual_length = cpu_to_be32(iso->actual_length);
639 } else {
640 iso->offset = be32_to_cpu(iso->offset);
641 iso->length = be32_to_cpu(iso->length);
642 iso->status = be32_to_cpu(iso->status);
643 iso->actual_length = be32_to_cpu(iso->actual_length);
644 }
645 }
646
647 static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
648 struct usb_iso_packet_descriptor *uiso, int pack)
649 {
650 if (pack) {
651 iso->offset = uiso->offset;
652 iso->length = uiso->length;
653 iso->status = uiso->status;
654 iso->actual_length = uiso->actual_length;
655 } else {
656 uiso->offset = iso->offset;
657 uiso->length = iso->length;
658 uiso->status = iso->status;
659 uiso->actual_length = iso->actual_length;
660 }
661 }
662
663 /* must free buffer */
664 void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
665 {
666 void *buff;
667 struct usbip_iso_packet_descriptor *iso;
668 int np = urb->number_of_packets;
669 ssize_t size = np * sizeof(*iso);
670 int i;
671
672 buff = kzalloc(size, GFP_KERNEL);
673 if (!buff)
674 return NULL;
675
676 for (i = 0; i < np; i++) {
677 iso = buff + (i * sizeof(*iso));
678
679 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
680 usbip_iso_packet_correct_endian(iso, 1);
681 }
682
683 *bufflen = size;
684
685 return buff;
686 }
687 EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
688
689 /* some members of urb must be substituted before. */
690 int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
691 {
692 void *buff;
693 struct usbip_iso_packet_descriptor *iso;
694 int np = urb->number_of_packets;
695 int size = np * sizeof(*iso);
696 int i;
697 int ret;
698 int total_length = 0;
699
700 if (!usb_pipeisoc(urb->pipe))
701 return 0;
702
703 /* my Bluetooth dongle gets ISO URBs which are np = 0 */
704 if (np == 0) {
705 /* pr_info("iso np == 0\n"); */
706 /* usbip_dump_urb(urb); */
707 return 0;
708 }
709
710 buff = kzalloc(size, GFP_KERNEL);
711 if (!buff)
712 return -ENOMEM;
713
714 ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
715 if (ret != size) {
716 dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
717 ret);
718 kfree(buff);
719
720 if (ud->side == USBIP_STUB)
721 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
722 else
723 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
724
725 return -EPIPE;
726 }
727
728 for (i = 0; i < np; i++) {
729 iso = buff + (i * sizeof(*iso));
730
731 usbip_iso_packet_correct_endian(iso, 0);
732 usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
733 total_length += urb->iso_frame_desc[i].actual_length;
734 }
735
736 kfree(buff);
737
738 if (total_length != urb->actual_length) {
739 dev_err(&urb->dev->dev,
740 "total length of iso packets %d not equal to actual "
741 "length of buffer %d\n",
742 total_length, urb->actual_length);
743
744 if (ud->side == USBIP_STUB)
745 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
746 else
747 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
748
749 return -EPIPE;
750 }
751
752 return ret;
753 }
754 EXPORT_SYMBOL_GPL(usbip_recv_iso);
755
756 /*
757 * This functions restores the padding which was removed for optimizing
758 * the bandwidth during transfer over tcp/ip
759 *
760 * buffer and iso packets need to be stored and be in propeper endian in urb
761 * before calling this function
762 */
763 int usbip_pad_iso(struct usbip_device *ud, struct urb *urb)
764 {
765 int np = urb->number_of_packets;
766 int i;
767 int ret;
768 int actualoffset = urb->actual_length;
769
770 if (!usb_pipeisoc(urb->pipe))
771 return 0;
772
773 /* if no packets or length of data is 0, then nothing to unpack */
774 if (np == 0 || urb->actual_length == 0)
775 return 0;
776
777 /*
778 * if actual_length is transfer_buffer_length then no padding is
779 * present.
780 */
781 if (urb->actual_length == urb->transfer_buffer_length)
782 return 0;
783
784 /*
785 * loop over all packets from last to first (to prevent overwritting
786 * memory when padding) and move them into the proper place
787 */
788 for (i = np-1; i > 0; i--) {
789 actualoffset -= urb->iso_frame_desc[i].actual_length;
790 memmove(urb->transfer_buffer + urb->iso_frame_desc[i].offset,
791 urb->transfer_buffer + actualoffset,
792 urb->iso_frame_desc[i].actual_length);
793 }
794
795 return ret;
796 }
797 EXPORT_SYMBOL_GPL(usbip_pad_iso);
798
799 /* some members of urb must be substituted before. */
800 int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
801 {
802 int ret;
803 int size;
804
805 if (ud->side == USBIP_STUB) {
806 /* stub_rx.c */
807 /* the direction of urb must be OUT. */
808 if (usb_pipein(urb->pipe))
809 return 0;
810
811 size = urb->transfer_buffer_length;
812 } else {
813 /* vhci_rx.c */
814 /* the direction of urb must be IN. */
815 if (usb_pipeout(urb->pipe))
816 return 0;
817
818 size = urb->actual_length;
819 }
820
821 /* no need to recv xbuff */
822 if (!(size > 0))
823 return 0;
824
825 ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
826 size, 0);
827 if (ret != size) {
828 dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
829 if (ud->side == USBIP_STUB) {
830 usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
831 } else {
832 usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
833 return -EPIPE;
834 }
835 }
836
837 return ret;
838 }
839 EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
840
841 static int __init usbip_core_init(void)
842 {
843 pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
844 return 0;
845 }
846
847 static void __exit usbip_core_exit(void)
848 {
849 return;
850 }
851
852 module_init(usbip_core_init);
853 module_exit(usbip_core_exit);
854
855 MODULE_AUTHOR(DRIVER_AUTHOR);
856 MODULE_DESCRIPTION(DRIVER_DESC);
857 MODULE_LICENSE("GPL");
858 MODULE_VERSION(USBIP_VERSION);
Linux Btrfs Development