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1/* Target based USB-Gadget
2 *
3 * UAS protocol handling, target callbacks, configfs handling,
4 * BBB (USB Mass Storage Class Bulk-Only (BBB) and Transport protocol handling.
5 *
6 * Author: Sebastian Andrzej Siewior <bigeasy at linutronix dot de>
7 * License: GPLv2 as published by FSF.
8 */
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/string.h>
13#include <linux/configfs.h>
14#include <linux/ctype.h>
15#include <linux/usb/ch9.h>
16#include <linux/usb/composite.h>
17#include <linux/usb/gadget.h>
18#include <linux/usb/storage.h>
19#include <scsi/scsi.h>
20#include <scsi/scsi_tcq.h>
21#include <target/target_core_base.h>
22#include <target/target_core_fabric.h>
23#include <target/target_core_fabric_configfs.h>
24#include <target/target_core_configfs.h>
25#include <target/configfs_macros.h>
26#include <asm/unaligned.h>
27
28#include "tcm_usb_gadget.h"
29
30USB_GADGET_COMPOSITE_OPTIONS();
31
32static struct target_fabric_configfs *usbg_fabric_configfs;
33
34static inline struct f_uas *to_f_uas(struct usb_function *f)
35{
36 return container_of(f, struct f_uas, function);
37}
38
39static void usbg_cmd_release(struct kref *);
40
41static inline void usbg_cleanup_cmd(struct usbg_cmd *cmd)
42{
43 kref_put(&cmd->ref, usbg_cmd_release);
44}
45
46/* Start bot.c code */
47
48static int bot_enqueue_cmd_cbw(struct f_uas *fu)
49{
50 int ret;
51
52 if (fu->flags & USBG_BOT_CMD_PEND)
53 return 0;
54
55 ret = usb_ep_queue(fu->ep_out, fu->cmd.req, GFP_ATOMIC);
56 if (!ret)
57 fu->flags |= USBG_BOT_CMD_PEND;
58 return ret;
59}
60
61static void bot_status_complete(struct usb_ep *ep, struct usb_request *req)
62{
63 struct usbg_cmd *cmd = req->context;
64 struct f_uas *fu = cmd->fu;
65
66 usbg_cleanup_cmd(cmd);
67 if (req->status < 0) {
68 pr_err("ERR %s(%d)\n", __func__, __LINE__);
69 return;
70 }
71
72 /* CSW completed, wait for next CBW */
73 bot_enqueue_cmd_cbw(fu);
74}
75
76static void bot_enqueue_sense_code(struct f_uas *fu, struct usbg_cmd *cmd)
77{
78 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
79 int ret;
80 u8 *sense;
81 unsigned int csw_stat;
82
83 csw_stat = cmd->csw_code;
84
85 /*
86 * We can't send SENSE as a response. So we take ASC & ASCQ from our
87 * sense buffer and queue it and hope the host sends a REQUEST_SENSE
88 * command where it learns why we failed.
89 */
90 sense = cmd->sense_iu.sense;
91
92 csw->Tag = cmd->bot_tag;
93 csw->Status = csw_stat;
94 fu->bot_status.req->context = cmd;
95 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_ATOMIC);
96 if (ret)
97 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
98}
99
100static void bot_err_compl(struct usb_ep *ep, struct usb_request *req)
101{
102 struct usbg_cmd *cmd = req->context;
103 struct f_uas *fu = cmd->fu;
104
105 if (req->status < 0)
106 pr_err("ERR %s(%d)\n", __func__, __LINE__);
107
108 if (cmd->data_len) {
109 if (cmd->data_len > ep->maxpacket) {
110 req->length = ep->maxpacket;
111 cmd->data_len -= ep->maxpacket;
112 } else {
113 req->length = cmd->data_len;
114 cmd->data_len = 0;
115 }
116
117 usb_ep_queue(ep, req, GFP_ATOMIC);
118 return ;
119 }
120 bot_enqueue_sense_code(fu, cmd);
121}
122
123static void bot_send_bad_status(struct usbg_cmd *cmd)
124{
125 struct f_uas *fu = cmd->fu;
126 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
127 struct usb_request *req;
128 struct usb_ep *ep;
129
130 csw->Residue = cpu_to_le32(cmd->data_len);
131
132 if (cmd->data_len) {
133 if (cmd->is_read) {
134 ep = fu->ep_in;
135 req = fu->bot_req_in;
136 } else {
137 ep = fu->ep_out;
138 req = fu->bot_req_out;
139 }
140
141 if (cmd->data_len > fu->ep_in->maxpacket) {
142 req->length = ep->maxpacket;
143 cmd->data_len -= ep->maxpacket;
144 } else {
145 req->length = cmd->data_len;
146 cmd->data_len = 0;
147 }
148 req->complete = bot_err_compl;
149 req->context = cmd;
150 req->buf = fu->cmd.buf;
151 usb_ep_queue(ep, req, GFP_KERNEL);
152 } else {
153 bot_enqueue_sense_code(fu, cmd);
154 }
155}
156
157static int bot_send_status(struct usbg_cmd *cmd, bool moved_data)
158{
159 struct f_uas *fu = cmd->fu;
160 struct bulk_cs_wrap *csw = &fu->bot_status.csw;
161 int ret;
162
163 if (cmd->se_cmd.scsi_status == SAM_STAT_GOOD) {
164 if (!moved_data && cmd->data_len) {
165 /*
166 * the host wants to move data, we don't. Fill / empty
167 * the pipe and then send the csw with reside set.
168 */
169 cmd->csw_code = US_BULK_STAT_OK;
170 bot_send_bad_status(cmd);
171 return 0;
172 }
173
174 csw->Tag = cmd->bot_tag;
175 csw->Residue = cpu_to_le32(0);
176 csw->Status = US_BULK_STAT_OK;
177 fu->bot_status.req->context = cmd;
178
179 ret = usb_ep_queue(fu->ep_in, fu->bot_status.req, GFP_KERNEL);
180 if (ret)
181 pr_err("%s(%d) ERR: %d\n", __func__, __LINE__, ret);
182 } else {
183 cmd->csw_code = US_BULK_STAT_FAIL;
184 bot_send_bad_status(cmd);
185 }
186 return 0;
187}
188
189/*
190 * Called after command (no data transfer) or after the write (to device)
191 * operation is completed
192 */
193static int bot_send_status_response(struct usbg_cmd *cmd)
194{
195 bool moved_data = false;
196
197 if (!cmd->is_read)
198 moved_data = true;
199 return bot_send_status(cmd, moved_data);
200}
201
202/* Read request completed, now we have to send the CSW */
203static void bot_read_compl(struct usb_ep *ep, struct usb_request *req)
204{
205 struct usbg_cmd *cmd = req->context;
206
207 if (req->status < 0)
208 pr_err("ERR %s(%d)\n", __func__, __LINE__);
209
210 bot_send_status(cmd, true);
211}
212
213static int bot_send_read_response(struct usbg_cmd *cmd)
214{
215 struct f_uas *fu = cmd->fu;
216 struct se_cmd *se_cmd = &cmd->se_cmd;
217 struct usb_gadget *gadget = fuas_to_gadget(fu);
218 int ret;
219
220 if (!cmd->data_len) {
221 cmd->csw_code = US_BULK_STAT_PHASE;
222 bot_send_bad_status(cmd);
223 return 0;
224 }
225
226 if (!gadget->sg_supported) {
227 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
228 if (!cmd->data_buf)
229 return -ENOMEM;
230
231 sg_copy_to_buffer(se_cmd->t_data_sg,
232 se_cmd->t_data_nents,
233 cmd->data_buf,
234 se_cmd->data_length);
235
236 fu->bot_req_in->buf = cmd->data_buf;
237 } else {
238 fu->bot_req_in->buf = NULL;
239 fu->bot_req_in->num_sgs = se_cmd->t_data_nents;
240 fu->bot_req_in->sg = se_cmd->t_data_sg;
241 }
242
243 fu->bot_req_in->complete = bot_read_compl;
244 fu->bot_req_in->length = se_cmd->data_length;
245 fu->bot_req_in->context = cmd;
246 ret = usb_ep_queue(fu->ep_in, fu->bot_req_in, GFP_ATOMIC);
247 if (ret)
248 pr_err("%s(%d)\n", __func__, __LINE__);
249 return 0;
250}
251
252static void usbg_data_write_cmpl(struct usb_ep *, struct usb_request *);
253static int usbg_prepare_w_request(struct usbg_cmd *, struct usb_request *);
254
255static int bot_send_write_request(struct usbg_cmd *cmd)
256{
257 struct f_uas *fu = cmd->fu;
258 struct se_cmd *se_cmd = &cmd->se_cmd;
259 struct usb_gadget *gadget = fuas_to_gadget(fu);
260 int ret;
261
262 init_completion(&cmd->write_complete);
263 cmd->fu = fu;
264
265 if (!cmd->data_len) {
266 cmd->csw_code = US_BULK_STAT_PHASE;
267 return -EINVAL;
268 }
269
270 if (!gadget->sg_supported) {
271 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_KERNEL);
272 if (!cmd->data_buf)
273 return -ENOMEM;
274
275 fu->bot_req_out->buf = cmd->data_buf;
276 } else {
277 fu->bot_req_out->buf = NULL;
278 fu->bot_req_out->num_sgs = se_cmd->t_data_nents;
279 fu->bot_req_out->sg = se_cmd->t_data_sg;
280 }
281
282 fu->bot_req_out->complete = usbg_data_write_cmpl;
283 fu->bot_req_out->length = se_cmd->data_length;
284 fu->bot_req_out->context = cmd;
285
286 ret = usbg_prepare_w_request(cmd, fu->bot_req_out);
287 if (ret)
288 goto cleanup;
289 ret = usb_ep_queue(fu->ep_out, fu->bot_req_out, GFP_KERNEL);
290 if (ret)
291 pr_err("%s(%d)\n", __func__, __LINE__);
292
293 wait_for_completion(&cmd->write_complete);
294 target_execute_cmd(se_cmd);
295cleanup:
296 return ret;
297}
298
299static int bot_submit_command(struct f_uas *, void *, unsigned int);
300
301static void bot_cmd_complete(struct usb_ep *ep, struct usb_request *req)
302{
303 struct f_uas *fu = req->context;
304 int ret;
305
306 fu->flags &= ~USBG_BOT_CMD_PEND;
307
308 if (req->status < 0)
309 return;
310
311 ret = bot_submit_command(fu, req->buf, req->actual);
312 if (ret)
313 pr_err("%s(%d): %d\n", __func__, __LINE__, ret);
314}
315
316static int bot_prepare_reqs(struct f_uas *fu)
317{
318 int ret;
319
320 fu->bot_req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
321 if (!fu->bot_req_in)
322 goto err;
323
324 fu->bot_req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
325 if (!fu->bot_req_out)
326 goto err_out;
327
328 fu->cmd.req = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
329 if (!fu->cmd.req)
330 goto err_cmd;
331
332 fu->bot_status.req = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
333 if (!fu->bot_status.req)
334 goto err_sts;
335
336 fu->bot_status.req->buf = &fu->bot_status.csw;
337 fu->bot_status.req->length = US_BULK_CS_WRAP_LEN;
338 fu->bot_status.req->complete = bot_status_complete;
339 fu->bot_status.csw.Signature = cpu_to_le32(US_BULK_CS_SIGN);
340
341 fu->cmd.buf = kmalloc(fu->ep_out->maxpacket, GFP_KERNEL);
342 if (!fu->cmd.buf)
343 goto err_buf;
344
345 fu->cmd.req->complete = bot_cmd_complete;
346 fu->cmd.req->buf = fu->cmd.buf;
347 fu->cmd.req->length = fu->ep_out->maxpacket;
348 fu->cmd.req->context = fu;
349
350 ret = bot_enqueue_cmd_cbw(fu);
351 if (ret)
352 goto err_queue;
353 return 0;
354err_queue:
355 kfree(fu->cmd.buf);
356 fu->cmd.buf = NULL;
357err_buf:
358 usb_ep_free_request(fu->ep_in, fu->bot_status.req);
359err_sts:
360 usb_ep_free_request(fu->ep_out, fu->cmd.req);
361 fu->cmd.req = NULL;
362err_cmd:
363 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
364 fu->bot_req_out = NULL;
365err_out:
366 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
367 fu->bot_req_in = NULL;
368err:
369 pr_err("BOT: endpoint setup failed\n");
370 return -ENOMEM;
371}
372
373static void bot_cleanup_old_alt(struct f_uas *fu)
374{
375 if (!(fu->flags & USBG_ENABLED))
376 return;
377
378 usb_ep_disable(fu->ep_in);
379 usb_ep_disable(fu->ep_out);
380
381 if (!fu->bot_req_in)
382 return;
383
384 usb_ep_free_request(fu->ep_in, fu->bot_req_in);
385 usb_ep_free_request(fu->ep_out, fu->bot_req_out);
386 usb_ep_free_request(fu->ep_out, fu->cmd.req);
387 usb_ep_free_request(fu->ep_out, fu->bot_status.req);
388
389 kfree(fu->cmd.buf);
390
391 fu->bot_req_in = NULL;
392 fu->bot_req_out = NULL;
393 fu->cmd.req = NULL;
394 fu->bot_status.req = NULL;
395 fu->cmd.buf = NULL;
396}
397
398static void bot_set_alt(struct f_uas *fu)
399{
400 struct usb_function *f = &fu->function;
401 struct usb_gadget *gadget = f->config->cdev->gadget;
402 int ret;
403
404 fu->flags = USBG_IS_BOT;
405
406 config_ep_by_speed(gadget, f, fu->ep_in);
407 ret = usb_ep_enable(fu->ep_in);
408 if (ret)
409 goto err_b_in;
410
411 config_ep_by_speed(gadget, f, fu->ep_out);
412 ret = usb_ep_enable(fu->ep_out);
413 if (ret)
414 goto err_b_out;
415
416 ret = bot_prepare_reqs(fu);
417 if (ret)
418 goto err_wq;
419 fu->flags |= USBG_ENABLED;
420 pr_info("Using the BOT protocol\n");
421 return;
422err_wq:
423 usb_ep_disable(fu->ep_out);
424err_b_out:
425 usb_ep_disable(fu->ep_in);
426err_b_in:
427 fu->flags = USBG_IS_BOT;
428}
429
430static int usbg_bot_setup(struct usb_function *f,
431 const struct usb_ctrlrequest *ctrl)
432{
433 struct f_uas *fu = to_f_uas(f);
434 struct usb_composite_dev *cdev = f->config->cdev;
435 u16 w_value = le16_to_cpu(ctrl->wValue);
436 u16 w_length = le16_to_cpu(ctrl->wLength);
437 int luns;
438 u8 *ret_lun;
439
440 switch (ctrl->bRequest) {
441 case US_BULK_GET_MAX_LUN:
442 if (ctrl->bRequestType != (USB_DIR_IN | USB_TYPE_CLASS |
443 USB_RECIP_INTERFACE))
444 return -ENOTSUPP;
445
446 if (w_length < 1)
447 return -EINVAL;
448 if (w_value != 0)
449 return -EINVAL;
450 luns = atomic_read(&fu->tpg->tpg_port_count);
451 if (!luns) {
452 pr_err("No LUNs configured?\n");
453 return -EINVAL;
454 }
455 /*
456 * If 4 LUNs are present we return 3 i.e. LUN 0..3 can be
457 * accessed. The upper limit is 0xf
458 */
459 luns--;
460 if (luns > 0xf) {
461 pr_info_once("Limiting the number of luns to 16\n");
462 luns = 0xf;
463 }
464 ret_lun = cdev->req->buf;
465 *ret_lun = luns;
466 cdev->req->length = 1;
467 return usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
468 break;
469
470 case US_BULK_RESET_REQUEST:
471 /* XXX maybe we should remove previous requests for IN + OUT */
472 bot_enqueue_cmd_cbw(fu);
473 return 0;
474 break;
475 }
476 return -ENOTSUPP;
477}
478
479/* Start uas.c code */
480
481static void uasp_cleanup_one_stream(struct f_uas *fu, struct uas_stream *stream)
482{
483 /* We have either all three allocated or none */
484 if (!stream->req_in)
485 return;
486
487 usb_ep_free_request(fu->ep_in, stream->req_in);
488 usb_ep_free_request(fu->ep_out, stream->req_out);
489 usb_ep_free_request(fu->ep_status, stream->req_status);
490
491 stream->req_in = NULL;
492 stream->req_out = NULL;
493 stream->req_status = NULL;
494}
495
496static void uasp_free_cmdreq(struct f_uas *fu)
497{
498 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
499 kfree(fu->cmd.buf);
500 fu->cmd.req = NULL;
501 fu->cmd.buf = NULL;
502}
503
504static void uasp_cleanup_old_alt(struct f_uas *fu)
505{
506 int i;
507
508 if (!(fu->flags & USBG_ENABLED))
509 return;
510
511 usb_ep_disable(fu->ep_in);
512 usb_ep_disable(fu->ep_out);
513 usb_ep_disable(fu->ep_status);
514 usb_ep_disable(fu->ep_cmd);
515
516 for (i = 0; i < UASP_SS_EP_COMP_NUM_STREAMS; i++)
517 uasp_cleanup_one_stream(fu, &fu->stream[i]);
518 uasp_free_cmdreq(fu);
519}
520
521static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req);
522
523static int uasp_prepare_r_request(struct usbg_cmd *cmd)
524{
525 struct se_cmd *se_cmd = &cmd->se_cmd;
526 struct f_uas *fu = cmd->fu;
527 struct usb_gadget *gadget = fuas_to_gadget(fu);
528 struct uas_stream *stream = cmd->stream;
529
530 if (!gadget->sg_supported) {
531 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
532 if (!cmd->data_buf)
533 return -ENOMEM;
534
535 sg_copy_to_buffer(se_cmd->t_data_sg,
536 se_cmd->t_data_nents,
537 cmd->data_buf,
538 se_cmd->data_length);
539
540 stream->req_in->buf = cmd->data_buf;
541 } else {
542 stream->req_in->buf = NULL;
543 stream->req_in->num_sgs = se_cmd->t_data_nents;
544 stream->req_in->sg = se_cmd->t_data_sg;
545 }
546
547 stream->req_in->complete = uasp_status_data_cmpl;
548 stream->req_in->length = se_cmd->data_length;
549 stream->req_in->context = cmd;
550
551 cmd->state = UASP_SEND_STATUS;
552 return 0;
553}
554
555static void uasp_prepare_status(struct usbg_cmd *cmd)
556{
557 struct se_cmd *se_cmd = &cmd->se_cmd;
558 struct sense_iu *iu = &cmd->sense_iu;
559 struct uas_stream *stream = cmd->stream;
560
561 cmd->state = UASP_QUEUE_COMMAND;
562 iu->iu_id = IU_ID_STATUS;
563 iu->tag = cpu_to_be16(cmd->tag);
564
565 /*
566 * iu->status_qual = cpu_to_be16(STATUS QUALIFIER SAM-4. Where R U?);
567 */
568 iu->len = cpu_to_be16(se_cmd->scsi_sense_length);
569 iu->status = se_cmd->scsi_status;
570 stream->req_status->context = cmd;
571 stream->req_status->length = se_cmd->scsi_sense_length + 16;
572 stream->req_status->buf = iu;
573 stream->req_status->complete = uasp_status_data_cmpl;
574}
575
576static void uasp_status_data_cmpl(struct usb_ep *ep, struct usb_request *req)
577{
578 struct usbg_cmd *cmd = req->context;
579 struct uas_stream *stream = cmd->stream;
580 struct f_uas *fu = cmd->fu;
581 int ret;
582
583 if (req->status < 0)
584 goto cleanup;
585
586 switch (cmd->state) {
587 case UASP_SEND_DATA:
588 ret = uasp_prepare_r_request(cmd);
589 if (ret)
590 goto cleanup;
591 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
592 if (ret)
593 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
594 break;
595
596 case UASP_RECEIVE_DATA:
597 ret = usbg_prepare_w_request(cmd, stream->req_out);
598 if (ret)
599 goto cleanup;
600 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
601 if (ret)
602 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
603 break;
604
605 case UASP_SEND_STATUS:
606 uasp_prepare_status(cmd);
607 ret = usb_ep_queue(fu->ep_status, stream->req_status,
608 GFP_ATOMIC);
609 if (ret)
610 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
611 break;
612
613 case UASP_QUEUE_COMMAND:
614 usbg_cleanup_cmd(cmd);
615 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
616 break;
617
618 default:
619 BUG();
620 }
621 return;
622
623cleanup:
624 usbg_cleanup_cmd(cmd);
625}
626
627static int uasp_send_status_response(struct usbg_cmd *cmd)
628{
629 struct f_uas *fu = cmd->fu;
630 struct uas_stream *stream = cmd->stream;
631 struct sense_iu *iu = &cmd->sense_iu;
632
633 iu->tag = cpu_to_be16(cmd->tag);
634 stream->req_status->complete = uasp_status_data_cmpl;
635 stream->req_status->context = cmd;
636 cmd->fu = fu;
637 uasp_prepare_status(cmd);
638 return usb_ep_queue(fu->ep_status, stream->req_status, GFP_ATOMIC);
639}
640
641static int uasp_send_read_response(struct usbg_cmd *cmd)
642{
643 struct f_uas *fu = cmd->fu;
644 struct uas_stream *stream = cmd->stream;
645 struct sense_iu *iu = &cmd->sense_iu;
646 int ret;
647
648 cmd->fu = fu;
649
650 iu->tag = cpu_to_be16(cmd->tag);
651 if (fu->flags & USBG_USE_STREAMS) {
652
653 ret = uasp_prepare_r_request(cmd);
654 if (ret)
655 goto out;
656 ret = usb_ep_queue(fu->ep_in, stream->req_in, GFP_ATOMIC);
657 if (ret) {
658 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
659 kfree(cmd->data_buf);
660 cmd->data_buf = NULL;
661 }
662
663 } else {
664
665 iu->iu_id = IU_ID_READ_READY;
666 iu->tag = cpu_to_be16(cmd->tag);
667
668 stream->req_status->complete = uasp_status_data_cmpl;
669 stream->req_status->context = cmd;
670
671 cmd->state = UASP_SEND_DATA;
672 stream->req_status->buf = iu;
673 stream->req_status->length = sizeof(struct iu);
674
675 ret = usb_ep_queue(fu->ep_status, stream->req_status,
676 GFP_ATOMIC);
677 if (ret)
678 pr_err("%s(%d) => %d\n", __func__, __LINE__, ret);
679 }
680out:
681 return ret;
682}
683
684static int uasp_send_write_request(struct usbg_cmd *cmd)
685{
686 struct f_uas *fu = cmd->fu;
687 struct se_cmd *se_cmd = &cmd->se_cmd;
688 struct uas_stream *stream = cmd->stream;
689 struct sense_iu *iu = &cmd->sense_iu;
690 int ret;
691
692 init_completion(&cmd->write_complete);
693 cmd->fu = fu;
694
695 iu->tag = cpu_to_be16(cmd->tag);
696
697 if (fu->flags & USBG_USE_STREAMS) {
698
699 ret = usbg_prepare_w_request(cmd, stream->req_out);
700 if (ret)
701 goto cleanup;
702 ret = usb_ep_queue(fu->ep_out, stream->req_out, GFP_ATOMIC);
703 if (ret)
704 pr_err("%s(%d)\n", __func__, __LINE__);
705
706 } else {
707
708 iu->iu_id = IU_ID_WRITE_READY;
709 iu->tag = cpu_to_be16(cmd->tag);
710
711 stream->req_status->complete = uasp_status_data_cmpl;
712 stream->req_status->context = cmd;
713
714 cmd->state = UASP_RECEIVE_DATA;
715 stream->req_status->buf = iu;
716 stream->req_status->length = sizeof(struct iu);
717
718 ret = usb_ep_queue(fu->ep_status, stream->req_status,
719 GFP_ATOMIC);
720 if (ret)
721 pr_err("%s(%d)\n", __func__, __LINE__);
722 }
723
724 wait_for_completion(&cmd->write_complete);
725 target_execute_cmd(se_cmd);
726cleanup:
727 return ret;
728}
729
730static int usbg_submit_command(struct f_uas *, void *, unsigned int);
731
732static void uasp_cmd_complete(struct usb_ep *ep, struct usb_request *req)
733{
734 struct f_uas *fu = req->context;
735 int ret;
736
737 if (req->status < 0)
738 return;
739
740 ret = usbg_submit_command(fu, req->buf, req->actual);
741 /*
742 * Once we tune for performance enqueue the command req here again so
743 * we can receive a second command while we processing this one. Pay
744 * attention to properly sync STAUS endpoint with DATA IN + OUT so you
745 * don't break HS.
746 */
747 if (!ret)
748 return;
749 usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
750}
751
752static int uasp_alloc_stream_res(struct f_uas *fu, struct uas_stream *stream)
753{
754 stream->req_in = usb_ep_alloc_request(fu->ep_in, GFP_KERNEL);
755 if (!stream->req_in)
756 goto out;
757
758 stream->req_out = usb_ep_alloc_request(fu->ep_out, GFP_KERNEL);
759 if (!stream->req_out)
760 goto err_out;
761
762 stream->req_status = usb_ep_alloc_request(fu->ep_status, GFP_KERNEL);
763 if (!stream->req_status)
764 goto err_sts;
765
766 return 0;
767err_sts:
768 usb_ep_free_request(fu->ep_status, stream->req_status);
769 stream->req_status = NULL;
770err_out:
771 usb_ep_free_request(fu->ep_out, stream->req_out);
772 stream->req_out = NULL;
773out:
774 return -ENOMEM;
775}
776
777static int uasp_alloc_cmd(struct f_uas *fu)
778{
779 fu->cmd.req = usb_ep_alloc_request(fu->ep_cmd, GFP_KERNEL);
780 if (!fu->cmd.req)
781 goto err;
782
783 fu->cmd.buf = kmalloc(fu->ep_cmd->maxpacket, GFP_KERNEL);
784 if (!fu->cmd.buf)
785 goto err_buf;
786
787 fu->cmd.req->complete = uasp_cmd_complete;
788 fu->cmd.req->buf = fu->cmd.buf;
789 fu->cmd.req->length = fu->ep_cmd->maxpacket;
790 fu->cmd.req->context = fu;
791 return 0;
792
793err_buf:
794 usb_ep_free_request(fu->ep_cmd, fu->cmd.req);
795err:
796 return -ENOMEM;
797}
798
799static void uasp_setup_stream_res(struct f_uas *fu, int max_streams)
800{
801 int i;
802
803 for (i = 0; i < max_streams; i++) {
804 struct uas_stream *s = &fu->stream[i];
805
806 s->req_in->stream_id = i + 1;
807 s->req_out->stream_id = i + 1;
808 s->req_status->stream_id = i + 1;
809 }
810}
811
812static int uasp_prepare_reqs(struct f_uas *fu)
813{
814 int ret;
815 int i;
816 int max_streams;
817
818 if (fu->flags & USBG_USE_STREAMS)
819 max_streams = UASP_SS_EP_COMP_NUM_STREAMS;
820 else
821 max_streams = 1;
822
823 for (i = 0; i < max_streams; i++) {
824 ret = uasp_alloc_stream_res(fu, &fu->stream[i]);
825 if (ret)
826 goto err_cleanup;
827 }
828
829 ret = uasp_alloc_cmd(fu);
830 if (ret)
831 goto err_free_stream;
832 uasp_setup_stream_res(fu, max_streams);
833
834 ret = usb_ep_queue(fu->ep_cmd, fu->cmd.req, GFP_ATOMIC);
835 if (ret)
836 goto err_free_stream;
837
838 return 0;
839
840err_free_stream:
841 uasp_free_cmdreq(fu);
842
843err_cleanup:
844 if (i) {
845 do {
846 uasp_cleanup_one_stream(fu, &fu->stream[i - 1]);
847 i--;
848 } while (i);
849 }
850 pr_err("UASP: endpoint setup failed\n");
851 return ret;
852}
853
854static void uasp_set_alt(struct f_uas *fu)
855{
856 struct usb_function *f = &fu->function;
857 struct usb_gadget *gadget = f->config->cdev->gadget;
858 int ret;
859
860 fu->flags = USBG_IS_UAS;
861
862 if (gadget->speed == USB_SPEED_SUPER)
863 fu->flags |= USBG_USE_STREAMS;
864
865 config_ep_by_speed(gadget, f, fu->ep_in);
866 ret = usb_ep_enable(fu->ep_in);
867 if (ret)
868 goto err_b_in;
869
870 config_ep_by_speed(gadget, f, fu->ep_out);
871 ret = usb_ep_enable(fu->ep_out);
872 if (ret)
873 goto err_b_out;
874
875 config_ep_by_speed(gadget, f, fu->ep_cmd);
876 ret = usb_ep_enable(fu->ep_cmd);
877 if (ret)
878 goto err_cmd;
879 config_ep_by_speed(gadget, f, fu->ep_status);
880 ret = usb_ep_enable(fu->ep_status);
881 if (ret)
882 goto err_status;
883
884 ret = uasp_prepare_reqs(fu);
885 if (ret)
886 goto err_wq;
887 fu->flags |= USBG_ENABLED;
888
889 pr_info("Using the UAS protocol\n");
890 return;
891err_wq:
892 usb_ep_disable(fu->ep_status);
893err_status:
894 usb_ep_disable(fu->ep_cmd);
895err_cmd:
896 usb_ep_disable(fu->ep_out);
897err_b_out:
898 usb_ep_disable(fu->ep_in);
899err_b_in:
900 fu->flags = 0;
901}
902
903static int get_cmd_dir(const unsigned char *cdb)
904{
905 int ret;
906
907 switch (cdb[0]) {
908 case READ_6:
909 case READ_10:
910 case READ_12:
911 case READ_16:
912 case INQUIRY:
913 case MODE_SENSE:
914 case MODE_SENSE_10:
915 case SERVICE_ACTION_IN:
916 case MAINTENANCE_IN:
917 case PERSISTENT_RESERVE_IN:
918 case SECURITY_PROTOCOL_IN:
919 case ACCESS_CONTROL_IN:
920 case REPORT_LUNS:
921 case READ_BLOCK_LIMITS:
922 case READ_POSITION:
923 case READ_CAPACITY:
924 case READ_TOC:
925 case READ_FORMAT_CAPACITIES:
926 case REQUEST_SENSE:
927 ret = DMA_FROM_DEVICE;
928 break;
929
930 case WRITE_6:
931 case WRITE_10:
932 case WRITE_12:
933 case WRITE_16:
934 case MODE_SELECT:
935 case MODE_SELECT_10:
936 case WRITE_VERIFY:
937 case WRITE_VERIFY_12:
938 case PERSISTENT_RESERVE_OUT:
939 case MAINTENANCE_OUT:
940 case SECURITY_PROTOCOL_OUT:
941 case ACCESS_CONTROL_OUT:
942 ret = DMA_TO_DEVICE;
943 break;
944 case ALLOW_MEDIUM_REMOVAL:
945 case TEST_UNIT_READY:
946 case SYNCHRONIZE_CACHE:
947 case START_STOP:
948 case ERASE:
949 case REZERO_UNIT:
950 case SEEK_10:
951 case SPACE:
952 case VERIFY:
953 case WRITE_FILEMARKS:
954 ret = DMA_NONE;
955 break;
956 default:
957 pr_warn("target: Unknown data direction for SCSI Opcode "
958 "0x%02x\n", cdb[0]);
959 ret = -EINVAL;
960 }
961 return ret;
962}
963
964static void usbg_data_write_cmpl(struct usb_ep *ep, struct usb_request *req)
965{
966 struct usbg_cmd *cmd = req->context;
967 struct se_cmd *se_cmd = &cmd->se_cmd;
968
969 if (req->status < 0) {
970 pr_err("%s() state %d transfer failed\n", __func__, cmd->state);
971 goto cleanup;
972 }
973
974 if (req->num_sgs == 0) {
975 sg_copy_from_buffer(se_cmd->t_data_sg,
976 se_cmd->t_data_nents,
977 cmd->data_buf,
978 se_cmd->data_length);
979 }
980
981 complete(&cmd->write_complete);
982 return;
983
984cleanup:
985 usbg_cleanup_cmd(cmd);
986}
987
988static int usbg_prepare_w_request(struct usbg_cmd *cmd, struct usb_request *req)
989{
990 struct se_cmd *se_cmd = &cmd->se_cmd;
991 struct f_uas *fu = cmd->fu;
992 struct usb_gadget *gadget = fuas_to_gadget(fu);
993
994 if (!gadget->sg_supported) {
995 cmd->data_buf = kmalloc(se_cmd->data_length, GFP_ATOMIC);
996 if (!cmd->data_buf)
997 return -ENOMEM;
998
999 req->buf = cmd->data_buf;
1000 } else {
1001 req->buf = NULL;
1002 req->num_sgs = se_cmd->t_data_nents;
1003 req->sg = se_cmd->t_data_sg;
1004 }
1005
1006 req->complete = usbg_data_write_cmpl;
1007 req->length = se_cmd->data_length;
1008 req->context = cmd;
1009 return 0;
1010}
1011
1012static int usbg_send_status_response(struct se_cmd *se_cmd)
1013{
1014 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1015 se_cmd);
1016 struct f_uas *fu = cmd->fu;
1017
1018 if (fu->flags & USBG_IS_BOT)
1019 return bot_send_status_response(cmd);
1020 else
1021 return uasp_send_status_response(cmd);
1022}
1023
1024static int usbg_send_write_request(struct se_cmd *se_cmd)
1025{
1026 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1027 se_cmd);
1028 struct f_uas *fu = cmd->fu;
1029
1030 if (fu->flags & USBG_IS_BOT)
1031 return bot_send_write_request(cmd);
1032 else
1033 return uasp_send_write_request(cmd);
1034}
1035
1036static int usbg_send_read_response(struct se_cmd *se_cmd)
1037{
1038 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1039 se_cmd);
1040 struct f_uas *fu = cmd->fu;
1041
1042 if (fu->flags & USBG_IS_BOT)
1043 return bot_send_read_response(cmd);
1044 else
1045 return uasp_send_read_response(cmd);
1046}
1047
1048static void usbg_cmd_work(struct work_struct *work)
1049{
1050 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1051 struct se_cmd *se_cmd;
1052 struct tcm_usbg_nexus *tv_nexus;
1053 struct usbg_tpg *tpg;
1054 int dir;
1055
1056 se_cmd = &cmd->se_cmd;
1057 tpg = cmd->fu->tpg;
1058 tv_nexus = tpg->tpg_nexus;
1059 dir = get_cmd_dir(cmd->cmd_buf);
1060 if (dir < 0) {
1061 transport_init_se_cmd(se_cmd,
1062 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1063 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1064 cmd->prio_attr, cmd->sense_iu.sense);
1065 goto out;
1066 }
1067
1068 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1069 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1070 0, cmd->prio_attr, dir, TARGET_SCF_UNKNOWN_SIZE) < 0)
1071 goto out;
1072
1073 return;
1074
1075out:
1076 transport_send_check_condition_and_sense(se_cmd,
1077 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1078 usbg_cleanup_cmd(cmd);
1079}
1080
1081static int usbg_submit_command(struct f_uas *fu,
1082 void *cmdbuf, unsigned int len)
1083{
1084 struct command_iu *cmd_iu = cmdbuf;
1085 struct usbg_cmd *cmd;
1086 struct usbg_tpg *tpg;
1087 struct se_cmd *se_cmd;
1088 struct tcm_usbg_nexus *tv_nexus;
1089 u32 cmd_len;
1090 int ret;
1091
1092 if (cmd_iu->iu_id != IU_ID_COMMAND) {
1093 pr_err("Unsupported type %d\n", cmd_iu->iu_id);
1094 return -EINVAL;
1095 }
1096
1097 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1098 if (!cmd)
1099 return -ENOMEM;
1100
1101 cmd->fu = fu;
1102
1103 /* XXX until I figure out why I can't free in on complete */
1104 kref_init(&cmd->ref);
1105 kref_get(&cmd->ref);
1106
1107 tpg = fu->tpg;
1108 cmd_len = (cmd_iu->len & ~0x3) + 16;
1109 if (cmd_len > USBG_MAX_CMD)
1110 goto err;
1111
1112 memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
1113
1114 cmd->tag = be16_to_cpup(&cmd_iu->tag);
1115 if (fu->flags & USBG_USE_STREAMS) {
1116 if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
1117 goto err;
1118 if (!cmd->tag)
1119 cmd->stream = &fu->stream[0];
1120 else
1121 cmd->stream = &fu->stream[cmd->tag - 1];
1122 } else {
1123 cmd->stream = &fu->stream[0];
1124 }
1125
1126 tv_nexus = tpg->tpg_nexus;
1127 if (!tv_nexus) {
1128 pr_err("Missing nexus, ignoring command\n");
1129 goto err;
1130 }
1131
1132 switch (cmd_iu->prio_attr & 0x7) {
1133 case UAS_HEAD_TAG:
1134 cmd->prio_attr = MSG_HEAD_TAG;
1135 break;
1136 case UAS_ORDERED_TAG:
1137 cmd->prio_attr = MSG_ORDERED_TAG;
1138 break;
1139 case UAS_ACA:
1140 cmd->prio_attr = MSG_ACA_TAG;
1141 break;
1142 default:
1143 pr_debug_once("Unsupported prio_attr: %02x.\n",
1144 cmd_iu->prio_attr);
1145 case UAS_SIMPLE_TAG:
1146 cmd->prio_attr = MSG_SIMPLE_TAG;
1147 break;
1148 }
1149
1150 se_cmd = &cmd->se_cmd;
1151 cmd->unpacked_lun = scsilun_to_int(&cmd_iu->lun);
1152
1153 INIT_WORK(&cmd->work, usbg_cmd_work);
1154 ret = queue_work(tpg->workqueue, &cmd->work);
1155 if (ret < 0)
1156 goto err;
1157
1158 return 0;
1159err:
1160 kfree(cmd);
1161 return -EINVAL;
1162}
1163
1164static void bot_cmd_work(struct work_struct *work)
1165{
1166 struct usbg_cmd *cmd = container_of(work, struct usbg_cmd, work);
1167 struct se_cmd *se_cmd;
1168 struct tcm_usbg_nexus *tv_nexus;
1169 struct usbg_tpg *tpg;
1170 int dir;
1171
1172 se_cmd = &cmd->se_cmd;
1173 tpg = cmd->fu->tpg;
1174 tv_nexus = tpg->tpg_nexus;
1175 dir = get_cmd_dir(cmd->cmd_buf);
1176 if (dir < 0) {
1177 transport_init_se_cmd(se_cmd,
1178 tv_nexus->tvn_se_sess->se_tpg->se_tpg_tfo,
1179 tv_nexus->tvn_se_sess, cmd->data_len, DMA_NONE,
1180 cmd->prio_attr, cmd->sense_iu.sense);
1181 goto out;
1182 }
1183
1184 if (target_submit_cmd(se_cmd, tv_nexus->tvn_se_sess,
1185 cmd->cmd_buf, cmd->sense_iu.sense, cmd->unpacked_lun,
1186 cmd->data_len, cmd->prio_attr, dir, 0) < 0)
1187 goto out;
1188
1189 return;
1190
1191out:
1192 transport_send_check_condition_and_sense(se_cmd,
1193 TCM_UNSUPPORTED_SCSI_OPCODE, 1);
1194 usbg_cleanup_cmd(cmd);
1195}
1196
1197static int bot_submit_command(struct f_uas *fu,
1198 void *cmdbuf, unsigned int len)
1199{
1200 struct bulk_cb_wrap *cbw = cmdbuf;
1201 struct usbg_cmd *cmd;
1202 struct usbg_tpg *tpg;
1203 struct se_cmd *se_cmd;
1204 struct tcm_usbg_nexus *tv_nexus;
1205 u32 cmd_len;
1206 int ret;
1207
1208 if (cbw->Signature != cpu_to_le32(US_BULK_CB_SIGN)) {
1209 pr_err("Wrong signature on CBW\n");
1210 return -EINVAL;
1211 }
1212 if (len != 31) {
1213 pr_err("Wrong length for CBW\n");
1214 return -EINVAL;
1215 }
1216
1217 cmd_len = cbw->Length;
1218 if (cmd_len < 1 || cmd_len > 16)
1219 return -EINVAL;
1220
1221 cmd = kzalloc(sizeof *cmd, GFP_ATOMIC);
1222 if (!cmd)
1223 return -ENOMEM;
1224
1225 cmd->fu = fu;
1226
1227 /* XXX until I figure out why I can't free in on complete */
1228 kref_init(&cmd->ref);
1229 kref_get(&cmd->ref);
1230
1231 tpg = fu->tpg;
1232
1233 memcpy(cmd->cmd_buf, cbw->CDB, cmd_len);
1234
1235 cmd->bot_tag = cbw->Tag;
1236
1237 tv_nexus = tpg->tpg_nexus;
1238 if (!tv_nexus) {
1239 pr_err("Missing nexus, ignoring command\n");
1240 goto err;
1241 }
1242
1243 cmd->prio_attr = MSG_SIMPLE_TAG;
1244 se_cmd = &cmd->se_cmd;
1245 cmd->unpacked_lun = cbw->Lun;
1246 cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
1247 cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
1248
1249 INIT_WORK(&cmd->work, bot_cmd_work);
1250 ret = queue_work(tpg->workqueue, &cmd->work);
1251 if (ret < 0)
1252 goto err;
1253
1254 return 0;
1255err:
1256 kfree(cmd);
1257 return -EINVAL;
1258}
1259
1260/* Start fabric.c code */
1261
1262static int usbg_check_true(struct se_portal_group *se_tpg)
1263{
1264 return 1;
1265}
1266
1267static int usbg_check_false(struct se_portal_group *se_tpg)
1268{
1269 return 0;
1270}
1271
1272static char *usbg_get_fabric_name(void)
1273{
1274 return "usb_gadget";
1275}
1276
1277static u8 usbg_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1278{
1279 struct usbg_tpg *tpg = container_of(se_tpg,
1280 struct usbg_tpg, se_tpg);
1281 struct usbg_tport *tport = tpg->tport;
1282 u8 proto_id;
1283
1284 switch (tport->tport_proto_id) {
1285 case SCSI_PROTOCOL_SAS:
1286 default:
1287 proto_id = sas_get_fabric_proto_ident(se_tpg);
1288 break;
1289 }
1290
1291 return proto_id;
1292}
1293
1294static char *usbg_get_fabric_wwn(struct se_portal_group *se_tpg)
1295{
1296 struct usbg_tpg *tpg = container_of(se_tpg,
1297 struct usbg_tpg, se_tpg);
1298 struct usbg_tport *tport = tpg->tport;
1299
1300 return &tport->tport_name[0];
1301}
1302
1303static u16 usbg_get_tag(struct se_portal_group *se_tpg)
1304{
1305 struct usbg_tpg *tpg = container_of(se_tpg,
1306 struct usbg_tpg, se_tpg);
1307 return tpg->tport_tpgt;
1308}
1309
1310static u32 usbg_get_default_depth(struct se_portal_group *se_tpg)
1311{
1312 return 1;
1313}
1314
1315static u32 usbg_get_pr_transport_id(
1316 struct se_portal_group *se_tpg,
1317 struct se_node_acl *se_nacl,
1318 struct t10_pr_registration *pr_reg,
1319 int *format_code,
1320 unsigned char *buf)
1321{
1322 struct usbg_tpg *tpg = container_of(se_tpg,
1323 struct usbg_tpg, se_tpg);
1324 struct usbg_tport *tport = tpg->tport;
1325 int ret = 0;
1326
1327 switch (tport->tport_proto_id) {
1328 case SCSI_PROTOCOL_SAS:
1329 default:
1330 ret = sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1331 format_code, buf);
1332 break;
1333 }
1334
1335 return ret;
1336}
1337
1338static u32 usbg_get_pr_transport_id_len(
1339 struct se_portal_group *se_tpg,
1340 struct se_node_acl *se_nacl,
1341 struct t10_pr_registration *pr_reg,
1342 int *format_code)
1343{
1344 struct usbg_tpg *tpg = container_of(se_tpg,
1345 struct usbg_tpg, se_tpg);
1346 struct usbg_tport *tport = tpg->tport;
1347 int ret = 0;
1348
1349 switch (tport->tport_proto_id) {
1350 case SCSI_PROTOCOL_SAS:
1351 default:
1352 ret = sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1353 format_code);
1354 break;
1355 }
1356
1357 return ret;
1358}
1359
1360static char *usbg_parse_pr_out_transport_id(
1361 struct se_portal_group *se_tpg,
1362 const char *buf,
1363 u32 *out_tid_len,
1364 char **port_nexus_ptr)
1365{
1366 struct usbg_tpg *tpg = container_of(se_tpg,
1367 struct usbg_tpg, se_tpg);
1368 struct usbg_tport *tport = tpg->tport;
1369 char *tid = NULL;
1370
1371 switch (tport->tport_proto_id) {
1372 case SCSI_PROTOCOL_SAS:
1373 default:
1374 tid = sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1375 port_nexus_ptr);
1376 }
1377
1378 return tid;
1379}
1380
1381static struct se_node_acl *usbg_alloc_fabric_acl(struct se_portal_group *se_tpg)
1382{
1383 struct usbg_nacl *nacl;
1384
1385 nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL);
1386 if (!nacl) {
1387 printk(KERN_ERR "Unable to allocate struct usbg_nacl\n");
1388 return NULL;
1389 }
1390
1391 return &nacl->se_node_acl;
1392}
1393
1394static void usbg_release_fabric_acl(
1395 struct se_portal_group *se_tpg,
1396 struct se_node_acl *se_nacl)
1397{
1398 struct usbg_nacl *nacl = container_of(se_nacl,
1399 struct usbg_nacl, se_node_acl);
1400 kfree(nacl);
1401}
1402
1403static u32 usbg_tpg_get_inst_index(struct se_portal_group *se_tpg)
1404{
1405 return 1;
1406}
1407
1408static void usbg_cmd_release(struct kref *ref)
1409{
1410 struct usbg_cmd *cmd = container_of(ref, struct usbg_cmd,
1411 ref);
1412
1413 transport_generic_free_cmd(&cmd->se_cmd, 0);
1414}
1415
1416static void usbg_release_cmd(struct se_cmd *se_cmd)
1417{
1418 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1419 se_cmd);
1420 kfree(cmd->data_buf);
1421 kfree(cmd);
1422 return;
1423}
1424
1425static int usbg_shutdown_session(struct se_session *se_sess)
1426{
1427 return 0;
1428}
1429
1430static void usbg_close_session(struct se_session *se_sess)
1431{
1432 return;
1433}
1434
1435static u32 usbg_sess_get_index(struct se_session *se_sess)
1436{
1437 return 0;
1438}
1439
1440/*
1441 * XXX Error recovery: return != 0 if we expect writes. Dunno when that could be
1442 */
1443static int usbg_write_pending_status(struct se_cmd *se_cmd)
1444{
1445 return 0;
1446}
1447
1448static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
1449{
1450 return;
1451}
1452
1453static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
1454{
1455 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1456 se_cmd);
1457 struct f_uas *fu = cmd->fu;
1458
1459 if (fu->flags & USBG_IS_BOT)
1460 return le32_to_cpu(cmd->bot_tag);
1461 else
1462 return cmd->tag;
1463}
1464
1465static int usbg_get_cmd_state(struct se_cmd *se_cmd)
1466{
1467 return 0;
1468}
1469
1470static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
1471{
1472}
1473
1474static void usbg_aborted_task(struct se_cmd *se_cmd)
1475{
1476 return;
1477}
1478
1479static const char *usbg_check_wwn(const char *name)
1480{
1481 const char *n;
1482 unsigned int len;
1483
1484 n = strstr(name, "naa.");
1485 if (!n)
1486 return NULL;
1487 n += 4;
1488 len = strlen(n);
1489 if (len == 0 || len > USBG_NAMELEN - 1)
1490 return NULL;
1491 return n;
1492}
1493
1494static struct se_node_acl *usbg_make_nodeacl(
1495 struct se_portal_group *se_tpg,
1496 struct config_group *group,
1497 const char *name)
1498{
1499 struct se_node_acl *se_nacl, *se_nacl_new;
1500 struct usbg_nacl *nacl;
1501 u64 wwpn = 0;
1502 u32 nexus_depth;
1503 const char *wnn_name;
1504
1505 wnn_name = usbg_check_wwn(name);
1506 if (!wnn_name)
1507 return ERR_PTR(-EINVAL);
1508 se_nacl_new = usbg_alloc_fabric_acl(se_tpg);
1509 if (!(se_nacl_new))
1510 return ERR_PTR(-ENOMEM);
1511
1512 nexus_depth = 1;
1513 /*
1514 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
1515 * when converting a NodeACL from demo mode -> explict
1516 */
1517 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
1518 name, nexus_depth);
1519 if (IS_ERR(se_nacl)) {
1520 usbg_release_fabric_acl(se_tpg, se_nacl_new);
1521 return se_nacl;
1522 }
1523 /*
1524 * Locate our struct usbg_nacl and set the FC Nport WWPN
1525 */
1526 nacl = container_of(se_nacl, struct usbg_nacl, se_node_acl);
1527 nacl->iport_wwpn = wwpn;
1528 snprintf(nacl->iport_name, sizeof(nacl->iport_name), "%s", name);
1529 return se_nacl;
1530}
1531
1532static void usbg_drop_nodeacl(struct se_node_acl *se_acl)
1533{
1534 struct usbg_nacl *nacl = container_of(se_acl,
1535 struct usbg_nacl, se_node_acl);
1536 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
1537 kfree(nacl);
1538}
1539
1540struct usbg_tpg *the_only_tpg_I_currently_have;
1541
1542static struct se_portal_group *usbg_make_tpg(
1543 struct se_wwn *wwn,
1544 struct config_group *group,
1545 const char *name)
1546{
1547 struct usbg_tport *tport = container_of(wwn, struct usbg_tport,
1548 tport_wwn);
1549 struct usbg_tpg *tpg;
1550 unsigned long tpgt;
1551 int ret;
1552
1553 if (strstr(name, "tpgt_") != name)
1554 return ERR_PTR(-EINVAL);
1555 if (kstrtoul(name + 5, 0, &tpgt) || tpgt > UINT_MAX)
1556 return ERR_PTR(-EINVAL);
1557 if (the_only_tpg_I_currently_have) {
1558 pr_err("Until the gadget framework can't handle multiple\n");
1559 pr_err("gadgets, you can't do this here.\n");
1560 return ERR_PTR(-EBUSY);
1561 }
1562
1563 tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
1564 if (!tpg) {
1565 printk(KERN_ERR "Unable to allocate struct usbg_tpg");
1566 return ERR_PTR(-ENOMEM);
1567 }
1568 mutex_init(&tpg->tpg_mutex);
1569 atomic_set(&tpg->tpg_port_count, 0);
1570 tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
1571 if (!tpg->workqueue) {
1572 kfree(tpg);
1573 return NULL;
1574 }
1575
1576 tpg->tport = tport;
1577 tpg->tport_tpgt = tpgt;
1578
1579 ret = core_tpg_register(&usbg_fabric_configfs->tf_ops, wwn,
1580 &tpg->se_tpg, tpg,
1581 TRANSPORT_TPG_TYPE_NORMAL);
1582 if (ret < 0) {
1583 destroy_workqueue(tpg->workqueue);
1584 kfree(tpg);
1585 return NULL;
1586 }
1587 the_only_tpg_I_currently_have = tpg;
1588 return &tpg->se_tpg;
1589}
1590
1591static void usbg_drop_tpg(struct se_portal_group *se_tpg)
1592{
1593 struct usbg_tpg *tpg = container_of(se_tpg,
1594 struct usbg_tpg, se_tpg);
1595
1596 core_tpg_deregister(se_tpg);
1597 destroy_workqueue(tpg->workqueue);
1598 kfree(tpg);
1599 the_only_tpg_I_currently_have = NULL;
1600}
1601
1602static struct se_wwn *usbg_make_tport(
1603 struct target_fabric_configfs *tf,
1604 struct config_group *group,
1605 const char *name)
1606{
1607 struct usbg_tport *tport;
1608 const char *wnn_name;
1609 u64 wwpn = 0;
1610
1611 wnn_name = usbg_check_wwn(name);
1612 if (!wnn_name)
1613 return ERR_PTR(-EINVAL);
1614
1615 tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
1616 if (!(tport)) {
1617 printk(KERN_ERR "Unable to allocate struct usbg_tport");
1618 return ERR_PTR(-ENOMEM);
1619 }
1620 tport->tport_wwpn = wwpn;
1621 snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
1622 return &tport->tport_wwn;
1623}
1624
1625static void usbg_drop_tport(struct se_wwn *wwn)
1626{
1627 struct usbg_tport *tport = container_of(wwn,
1628 struct usbg_tport, tport_wwn);
1629 kfree(tport);
1630}
1631
1632/*
1633 * If somebody feels like dropping the version property, go ahead.
1634 */
1635static ssize_t usbg_wwn_show_attr_version(
1636 struct target_fabric_configfs *tf,
1637 char *page)
1638{
1639 return sprintf(page, "usb-gadget fabric module\n");
1640}
1641TF_WWN_ATTR_RO(usbg, version);
1642
1643static struct configfs_attribute *usbg_wwn_attrs[] = {
1644 &usbg_wwn_version.attr,
1645 NULL,
1646};
1647
1648static ssize_t tcm_usbg_tpg_show_enable(
1649 struct se_portal_group *se_tpg,
1650 char *page)
1651{
1652 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1653
1654 return snprintf(page, PAGE_SIZE, "%u\n", tpg->gadget_connect);
1655}
1656
1657static int usbg_attach(struct usbg_tpg *);
1658static void usbg_detach(struct usbg_tpg *);
1659
1660static ssize_t tcm_usbg_tpg_store_enable(
1661 struct se_portal_group *se_tpg,
1662 const char *page,
1663 size_t count)
1664{
1665 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1666 unsigned long op;
1667 ssize_t ret;
1668
1669 ret = kstrtoul(page, 0, &op);
1670 if (ret < 0)
1671 return -EINVAL;
1672 if (op > 1)
1673 return -EINVAL;
1674
1675 if (op && tpg->gadget_connect)
1676 goto out;
1677 if (!op && !tpg->gadget_connect)
1678 goto out;
1679
1680 if (op) {
1681 ret = usbg_attach(tpg);
1682 if (ret)
1683 goto out;
1684 } else {
1685 usbg_detach(tpg);
1686 }
1687 tpg->gadget_connect = op;
1688out:
1689 return count;
1690}
1691TF_TPG_BASE_ATTR(tcm_usbg, enable, S_IRUGO | S_IWUSR);
1692
1693static ssize_t tcm_usbg_tpg_show_nexus(
1694 struct se_portal_group *se_tpg,
1695 char *page)
1696{
1697 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1698 struct tcm_usbg_nexus *tv_nexus;
1699 ssize_t ret;
1700
1701 mutex_lock(&tpg->tpg_mutex);
1702 tv_nexus = tpg->tpg_nexus;
1703 if (!tv_nexus) {
1704 ret = -ENODEV;
1705 goto out;
1706 }
1707 ret = snprintf(page, PAGE_SIZE, "%s\n",
1708 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1709out:
1710 mutex_unlock(&tpg->tpg_mutex);
1711 return ret;
1712}
1713
1714static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
1715{
1716 struct se_portal_group *se_tpg;
1717 struct tcm_usbg_nexus *tv_nexus;
1718 int ret;
1719
1720 mutex_lock(&tpg->tpg_mutex);
1721 if (tpg->tpg_nexus) {
1722 ret = -EEXIST;
1723 pr_debug("tpg->tpg_nexus already exists\n");
1724 goto err_unlock;
1725 }
1726 se_tpg = &tpg->se_tpg;
1727
1728 ret = -ENOMEM;
1729 tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
1730 if (!tv_nexus) {
1731 pr_err("Unable to allocate struct tcm_vhost_nexus\n");
1732 goto err_unlock;
1733 }
1734 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1735 if (IS_ERR(tv_nexus->tvn_se_sess))
1736 goto err_free;
1737
1738 /*
1739 * Since we are running in 'demo mode' this call with generate a
1740 * struct se_node_acl for the tcm_vhost struct se_portal_group with
1741 * the SCSI Initiator port name of the passed configfs group 'name'.
1742 */
1743 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1744 se_tpg, name);
1745 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1746 pr_debug("core_tpg_check_initiator_node_acl() failed"
1747 " for %s\n", name);
1748 goto err_session;
1749 }
1750 /*
1751 * Now register the TCM vHost virtual I_T Nexus as active with the
1752 * call to __transport_register_session()
1753 */
1754 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1755 tv_nexus->tvn_se_sess, tv_nexus);
1756 tpg->tpg_nexus = tv_nexus;
1757 mutex_unlock(&tpg->tpg_mutex);
1758 return 0;
1759
1760err_session:
1761 transport_free_session(tv_nexus->tvn_se_sess);
1762err_free:
1763 kfree(tv_nexus);
1764err_unlock:
1765 mutex_unlock(&tpg->tpg_mutex);
1766 return ret;
1767}
1768
1769static int tcm_usbg_drop_nexus(struct usbg_tpg *tpg)
1770{
1771 struct se_session *se_sess;
1772 struct tcm_usbg_nexus *tv_nexus;
1773 int ret = -ENODEV;
1774
1775 mutex_lock(&tpg->tpg_mutex);
1776 tv_nexus = tpg->tpg_nexus;
1777 if (!tv_nexus)
1778 goto out;
1779
1780 se_sess = tv_nexus->tvn_se_sess;
1781 if (!se_sess)
1782 goto out;
1783
1784 if (atomic_read(&tpg->tpg_port_count)) {
1785 ret = -EPERM;
1786 pr_err("Unable to remove Host I_T Nexus with"
1787 " active TPG port count: %d\n",
1788 atomic_read(&tpg->tpg_port_count));
1789 goto out;
1790 }
1791
1792 pr_debug("Removing I_T Nexus to Initiator Port: %s\n",
1793 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1794 /*
1795 * Release the SCSI I_T Nexus to the emulated vHost Target Port
1796 */
1797 transport_deregister_session(tv_nexus->tvn_se_sess);
1798 tpg->tpg_nexus = NULL;
1799
1800 kfree(tv_nexus);
1801 ret = 0;
1802out:
1803 mutex_unlock(&tpg->tpg_mutex);
1804 return ret;
1805}
1806
1807static ssize_t tcm_usbg_tpg_store_nexus(
1808 struct se_portal_group *se_tpg,
1809 const char *page,
1810 size_t count)
1811{
1812 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1813 unsigned char i_port[USBG_NAMELEN], *ptr;
1814 int ret;
1815
1816 if (!strncmp(page, "NULL", 4)) {
1817 ret = tcm_usbg_drop_nexus(tpg);
1818 return (!ret) ? count : ret;
1819 }
1820 if (strlen(page) >= USBG_NAMELEN) {
1821 pr_err("Emulated NAA Sas Address: %s, exceeds"
1822 " max: %d\n", page, USBG_NAMELEN);
1823 return -EINVAL;
1824 }
1825 snprintf(i_port, USBG_NAMELEN, "%s", page);
1826
1827 ptr = strstr(i_port, "naa.");
1828 if (!ptr) {
1829 pr_err("Missing 'naa.' prefix\n");
1830 return -EINVAL;
1831 }
1832
1833 if (i_port[strlen(i_port) - 1] == '\n')
1834 i_port[strlen(i_port) - 1] = '\0';
1835
1836 ret = tcm_usbg_make_nexus(tpg, &i_port[4]);
1837 if (ret < 0)
1838 return ret;
1839 return count;
1840}
1841TF_TPG_BASE_ATTR(tcm_usbg, nexus, S_IRUGO | S_IWUSR);
1842
1843static struct configfs_attribute *usbg_base_attrs[] = {
1844 &tcm_usbg_tpg_enable.attr,
1845 &tcm_usbg_tpg_nexus.attr,
1846 NULL,
1847};
1848
1849static int usbg_port_link(struct se_portal_group *se_tpg, struct se_lun *lun)
1850{
1851 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1852
1853 atomic_inc(&tpg->tpg_port_count);
1854 smp_mb__after_atomic_inc();
1855 return 0;
1856}
1857
1858static void usbg_port_unlink(struct se_portal_group *se_tpg,
1859 struct se_lun *se_lun)
1860{
1861 struct usbg_tpg *tpg = container_of(se_tpg, struct usbg_tpg, se_tpg);
1862
1863 atomic_dec(&tpg->tpg_port_count);
1864 smp_mb__after_atomic_dec();
1865}
1866
1867static int usbg_check_stop_free(struct se_cmd *se_cmd)
1868{
1869 struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
1870 se_cmd);
1871
1872 kref_put(&cmd->ref, usbg_cmd_release);
1873 return 1;
1874}
1875
1876static struct target_core_fabric_ops usbg_ops = {
1877 .get_fabric_name = usbg_get_fabric_name,
1878 .get_fabric_proto_ident = usbg_get_fabric_proto_ident,
1879 .tpg_get_wwn = usbg_get_fabric_wwn,
1880 .tpg_get_tag = usbg_get_tag,
1881 .tpg_get_default_depth = usbg_get_default_depth,
1882 .tpg_get_pr_transport_id = usbg_get_pr_transport_id,
1883 .tpg_get_pr_transport_id_len = usbg_get_pr_transport_id_len,
1884 .tpg_parse_pr_out_transport_id = usbg_parse_pr_out_transport_id,
1885 .tpg_check_demo_mode = usbg_check_true,
1886 .tpg_check_demo_mode_cache = usbg_check_false,
1887 .tpg_check_demo_mode_write_protect = usbg_check_false,
1888 .tpg_check_prod_mode_write_protect = usbg_check_false,
1889 .tpg_alloc_fabric_acl = usbg_alloc_fabric_acl,
1890 .tpg_release_fabric_acl = usbg_release_fabric_acl,
1891 .tpg_get_inst_index = usbg_tpg_get_inst_index,
1892 .release_cmd = usbg_release_cmd,
1893 .shutdown_session = usbg_shutdown_session,
1894 .close_session = usbg_close_session,
1895 .sess_get_index = usbg_sess_get_index,
1896 .sess_get_initiator_sid = NULL,
1897 .write_pending = usbg_send_write_request,
1898 .write_pending_status = usbg_write_pending_status,
1899 .set_default_node_attributes = usbg_set_default_node_attrs,
1900 .get_task_tag = usbg_get_task_tag,
1901 .get_cmd_state = usbg_get_cmd_state,
1902 .queue_data_in = usbg_send_read_response,
1903 .queue_status = usbg_send_status_response,
1904 .queue_tm_rsp = usbg_queue_tm_rsp,
1905 .aborted_task = usbg_aborted_task,
1906 .check_stop_free = usbg_check_stop_free,
1907
1908 .fabric_make_wwn = usbg_make_tport,
1909 .fabric_drop_wwn = usbg_drop_tport,
1910 .fabric_make_tpg = usbg_make_tpg,
1911 .fabric_drop_tpg = usbg_drop_tpg,
1912 .fabric_post_link = usbg_port_link,
1913 .fabric_pre_unlink = usbg_port_unlink,
1914 .fabric_make_np = NULL,
1915 .fabric_drop_np = NULL,
1916 .fabric_make_nodeacl = usbg_make_nodeacl,
1917 .fabric_drop_nodeacl = usbg_drop_nodeacl,
1918};
1919
1920static int usbg_register_configfs(void)
1921{
1922 struct target_fabric_configfs *fabric;
1923 int ret;
1924
1925 fabric = target_fabric_configfs_init(THIS_MODULE, "usb_gadget");
1926 if (IS_ERR(fabric)) {
1927 printk(KERN_ERR "target_fabric_configfs_init() failed\n");
1928 return PTR_ERR(fabric);
1929 }
1930
1931 fabric->tf_ops = usbg_ops;
1932 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = usbg_wwn_attrs;
1933 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = usbg_base_attrs;
1934 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
1935 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
1936 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
1937 fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
1938 fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
1939 fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
1940 fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
1941 ret = target_fabric_configfs_register(fabric);
1942 if (ret < 0) {
1943 printk(KERN_ERR "target_fabric_configfs_register() failed"
1944 " for usb-gadget\n");
1945 return ret;
1946 }
1947 usbg_fabric_configfs = fabric;
1948 return 0;
1949};
1950
1951static void usbg_deregister_configfs(void)
1952{
1953 if (!(usbg_fabric_configfs))
1954 return;
1955
1956 target_fabric_configfs_deregister(usbg_fabric_configfs);
1957 usbg_fabric_configfs = NULL;
1958};
1959
1960/* Start gadget.c code */
1961
1962static struct usb_interface_descriptor bot_intf_desc = {
1963 .bLength = sizeof(bot_intf_desc),
1964 .bDescriptorType = USB_DT_INTERFACE,
1965 .bNumEndpoints = 2,
1966 .bAlternateSetting = USB_G_ALT_INT_BBB,
1967 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1968 .bInterfaceSubClass = USB_SC_SCSI,
1969 .bInterfaceProtocol = USB_PR_BULK,
1970};
1971
1972static struct usb_interface_descriptor uasp_intf_desc = {
1973 .bLength = sizeof(uasp_intf_desc),
1974 .bDescriptorType = USB_DT_INTERFACE,
1975 .bNumEndpoints = 4,
1976 .bAlternateSetting = USB_G_ALT_INT_UAS,
1977 .bInterfaceClass = USB_CLASS_MASS_STORAGE,
1978 .bInterfaceSubClass = USB_SC_SCSI,
1979 .bInterfaceProtocol = USB_PR_UAS,
1980};
1981
1982static struct usb_endpoint_descriptor uasp_bi_desc = {
1983 .bLength = USB_DT_ENDPOINT_SIZE,
1984 .bDescriptorType = USB_DT_ENDPOINT,
1985 .bEndpointAddress = USB_DIR_IN,
1986 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1987 .wMaxPacketSize = cpu_to_le16(512),
1988};
1989
1990static struct usb_endpoint_descriptor uasp_fs_bi_desc = {
1991 .bLength = USB_DT_ENDPOINT_SIZE,
1992 .bDescriptorType = USB_DT_ENDPOINT,
1993 .bEndpointAddress = USB_DIR_IN,
1994 .bmAttributes = USB_ENDPOINT_XFER_BULK,
1995};
1996
1997static struct usb_pipe_usage_descriptor uasp_bi_pipe_desc = {
1998 .bLength = sizeof(uasp_bi_pipe_desc),
1999 .bDescriptorType = USB_DT_PIPE_USAGE,
2000 .bPipeID = DATA_IN_PIPE_ID,
2001};
2002
2003static struct usb_endpoint_descriptor uasp_ss_bi_desc = {
2004 .bLength = USB_DT_ENDPOINT_SIZE,
2005 .bDescriptorType = USB_DT_ENDPOINT,
2006 .bEndpointAddress = USB_DIR_IN,
2007 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2008 .wMaxPacketSize = cpu_to_le16(1024),
2009};
2010
2011static struct usb_ss_ep_comp_descriptor uasp_bi_ep_comp_desc = {
2012 .bLength = sizeof(uasp_bi_ep_comp_desc),
2013 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2014 .bMaxBurst = 0,
2015 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2016 .wBytesPerInterval = 0,
2017};
2018
2019static struct usb_ss_ep_comp_descriptor bot_bi_ep_comp_desc = {
2020 .bLength = sizeof(bot_bi_ep_comp_desc),
2021 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2022 .bMaxBurst = 0,
2023};
2024
2025static struct usb_endpoint_descriptor uasp_bo_desc = {
2026 .bLength = USB_DT_ENDPOINT_SIZE,
2027 .bDescriptorType = USB_DT_ENDPOINT,
2028 .bEndpointAddress = USB_DIR_OUT,
2029 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2030 .wMaxPacketSize = cpu_to_le16(512),
2031};
2032
2033static struct usb_endpoint_descriptor uasp_fs_bo_desc = {
2034 .bLength = USB_DT_ENDPOINT_SIZE,
2035 .bDescriptorType = USB_DT_ENDPOINT,
2036 .bEndpointAddress = USB_DIR_OUT,
2037 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2038};
2039
2040static struct usb_pipe_usage_descriptor uasp_bo_pipe_desc = {
2041 .bLength = sizeof(uasp_bo_pipe_desc),
2042 .bDescriptorType = USB_DT_PIPE_USAGE,
2043 .bPipeID = DATA_OUT_PIPE_ID,
2044};
2045
2046static struct usb_endpoint_descriptor uasp_ss_bo_desc = {
2047 .bLength = USB_DT_ENDPOINT_SIZE,
2048 .bDescriptorType = USB_DT_ENDPOINT,
2049 .bEndpointAddress = USB_DIR_OUT,
2050 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2051 .wMaxPacketSize = cpu_to_le16(0x400),
2052};
2053
2054static struct usb_ss_ep_comp_descriptor uasp_bo_ep_comp_desc = {
2055 .bLength = sizeof(uasp_bo_ep_comp_desc),
2056 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2057 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2058};
2059
2060static struct usb_ss_ep_comp_descriptor bot_bo_ep_comp_desc = {
2061 .bLength = sizeof(bot_bo_ep_comp_desc),
2062 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2063};
2064
2065static struct usb_endpoint_descriptor uasp_status_desc = {
2066 .bLength = USB_DT_ENDPOINT_SIZE,
2067 .bDescriptorType = USB_DT_ENDPOINT,
2068 .bEndpointAddress = USB_DIR_IN,
2069 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2070 .wMaxPacketSize = cpu_to_le16(512),
2071};
2072
2073static struct usb_endpoint_descriptor uasp_fs_status_desc = {
2074 .bLength = USB_DT_ENDPOINT_SIZE,
2075 .bDescriptorType = USB_DT_ENDPOINT,
2076 .bEndpointAddress = USB_DIR_IN,
2077 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2078};
2079
2080static struct usb_pipe_usage_descriptor uasp_status_pipe_desc = {
2081 .bLength = sizeof(uasp_status_pipe_desc),
2082 .bDescriptorType = USB_DT_PIPE_USAGE,
2083 .bPipeID = STATUS_PIPE_ID,
2084};
2085
2086static struct usb_endpoint_descriptor uasp_ss_status_desc = {
2087 .bLength = USB_DT_ENDPOINT_SIZE,
2088 .bDescriptorType = USB_DT_ENDPOINT,
2089 .bEndpointAddress = USB_DIR_IN,
2090 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2091 .wMaxPacketSize = cpu_to_le16(1024),
2092};
2093
2094static struct usb_ss_ep_comp_descriptor uasp_status_in_ep_comp_desc = {
2095 .bLength = sizeof(uasp_status_in_ep_comp_desc),
2096 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2097 .bmAttributes = UASP_SS_EP_COMP_LOG_STREAMS,
2098};
2099
2100static struct usb_endpoint_descriptor uasp_cmd_desc = {
2101 .bLength = USB_DT_ENDPOINT_SIZE,
2102 .bDescriptorType = USB_DT_ENDPOINT,
2103 .bEndpointAddress = USB_DIR_OUT,
2104 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2105 .wMaxPacketSize = cpu_to_le16(512),
2106};
2107
2108static struct usb_endpoint_descriptor uasp_fs_cmd_desc = {
2109 .bLength = USB_DT_ENDPOINT_SIZE,
2110 .bDescriptorType = USB_DT_ENDPOINT,
2111 .bEndpointAddress = USB_DIR_OUT,
2112 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2113};
2114
2115static struct usb_pipe_usage_descriptor uasp_cmd_pipe_desc = {
2116 .bLength = sizeof(uasp_cmd_pipe_desc),
2117 .bDescriptorType = USB_DT_PIPE_USAGE,
2118 .bPipeID = CMD_PIPE_ID,
2119};
2120
2121static struct usb_endpoint_descriptor uasp_ss_cmd_desc = {
2122 .bLength = USB_DT_ENDPOINT_SIZE,
2123 .bDescriptorType = USB_DT_ENDPOINT,
2124 .bEndpointAddress = USB_DIR_OUT,
2125 .bmAttributes = USB_ENDPOINT_XFER_BULK,
2126 .wMaxPacketSize = cpu_to_le16(1024),
2127};
2128
2129static struct usb_ss_ep_comp_descriptor uasp_cmd_comp_desc = {
2130 .bLength = sizeof(uasp_cmd_comp_desc),
2131 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
2132};
2133
2134static struct usb_descriptor_header *uasp_fs_function_desc[] = {
2135 (struct usb_descriptor_header *) &bot_intf_desc,
2136 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2137 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2138
2139 (struct usb_descriptor_header *) &uasp_intf_desc,
2140 (struct usb_descriptor_header *) &uasp_fs_bi_desc,
2141 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2142 (struct usb_descriptor_header *) &uasp_fs_bo_desc,
2143 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2144 (struct usb_descriptor_header *) &uasp_fs_status_desc,
2145 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2146 (struct usb_descriptor_header *) &uasp_fs_cmd_desc,
2147 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2148 NULL,
2149};
2150
2151static struct usb_descriptor_header *uasp_hs_function_desc[] = {
2152 (struct usb_descriptor_header *) &bot_intf_desc,
2153 (struct usb_descriptor_header *) &uasp_bi_desc,
2154 (struct usb_descriptor_header *) &uasp_bo_desc,
2155
2156 (struct usb_descriptor_header *) &uasp_intf_desc,
2157 (struct usb_descriptor_header *) &uasp_bi_desc,
2158 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2159 (struct usb_descriptor_header *) &uasp_bo_desc,
2160 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2161 (struct usb_descriptor_header *) &uasp_status_desc,
2162 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2163 (struct usb_descriptor_header *) &uasp_cmd_desc,
2164 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2165 NULL,
2166};
2167
2168static struct usb_descriptor_header *uasp_ss_function_desc[] = {
2169 (struct usb_descriptor_header *) &bot_intf_desc,
2170 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2171 (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
2172 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2173 (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,
2174
2175 (struct usb_descriptor_header *) &uasp_intf_desc,
2176 (struct usb_descriptor_header *) &uasp_ss_bi_desc,
2177 (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
2178 (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
2179 (struct usb_descriptor_header *) &uasp_ss_bo_desc,
2180 (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
2181 (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
2182 (struct usb_descriptor_header *) &uasp_ss_status_desc,
2183 (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
2184 (struct usb_descriptor_header *) &uasp_status_pipe_desc,
2185 (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
2186 (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
2187 (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
2188 NULL,
2189};
2190
2191#define UAS_VENDOR_ID 0x0525 /* NetChip */
2192#define UAS_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */
2193
2194static struct usb_device_descriptor usbg_device_desc = {
2195 .bLength = sizeof(usbg_device_desc),
2196 .bDescriptorType = USB_DT_DEVICE,
2197 .bcdUSB = cpu_to_le16(0x0200),
2198 .bDeviceClass = USB_CLASS_PER_INTERFACE,
2199 .idVendor = cpu_to_le16(UAS_VENDOR_ID),
2200 .idProduct = cpu_to_le16(UAS_PRODUCT_ID),
2201 .bNumConfigurations = 1,
2202};
2203
2204static struct usb_string usbg_us_strings[] = {
2205 [USB_GADGET_MANUFACTURER_IDX].s = "Target Manufactor",
2206 [USB_GADGET_PRODUCT_IDX].s = "Target Product",
2207 [USB_GADGET_SERIAL_IDX].s = "000000000001",
2208 [USB_G_STR_CONFIG].s = "default config",
2209 [USB_G_STR_INT_UAS].s = "USB Attached SCSI",
2210 [USB_G_STR_INT_BBB].s = "Bulk Only Transport",
2211 { },
2212};
2213
2214static struct usb_gadget_strings usbg_stringtab = {
2215 .language = 0x0409,
2216 .strings = usbg_us_strings,
2217};
2218
2219static struct usb_gadget_strings *usbg_strings[] = {
2220 &usbg_stringtab,
2221 NULL,
2222};
2223
2224static int guas_unbind(struct usb_composite_dev *cdev)
2225{
2226 return 0;
2227}
2228
2229static struct usb_configuration usbg_config_driver = {
2230 .label = "Linux Target",
2231 .bConfigurationValue = 1,
2232 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
2233};
2234
2235static void give_back_ep(struct usb_ep **pep)
2236{
2237 struct usb_ep *ep = *pep;
2238 if (!ep)
2239 return;
2240 ep->driver_data = NULL;
2241}
2242
2243static int usbg_bind(struct usb_configuration *c, struct usb_function *f)
2244{
2245 struct f_uas *fu = to_f_uas(f);
2246 struct usb_gadget *gadget = c->cdev->gadget;
2247 struct usb_ep *ep;
2248 int iface;
2249 int ret;
2250
2251 iface = usb_interface_id(c, f);
2252 if (iface < 0)
2253 return iface;
2254
2255 bot_intf_desc.bInterfaceNumber = iface;
2256 uasp_intf_desc.bInterfaceNumber = iface;
2257 fu->iface = iface;
2258 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bi_desc,
2259 &uasp_bi_ep_comp_desc);
2260 if (!ep)
2261 goto ep_fail;
2262
2263 ep->driver_data = fu;
2264 fu->ep_in = ep;
2265
2266 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_bo_desc,
2267 &uasp_bo_ep_comp_desc);
2268 if (!ep)
2269 goto ep_fail;
2270 ep->driver_data = fu;
2271 fu->ep_out = ep;
2272
2273 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_status_desc,
2274 &uasp_status_in_ep_comp_desc);
2275 if (!ep)
2276 goto ep_fail;
2277 ep->driver_data = fu;
2278 fu->ep_status = ep;
2279
2280 ep = usb_ep_autoconfig_ss(gadget, &uasp_ss_cmd_desc,
2281 &uasp_cmd_comp_desc);
2282 if (!ep)
2283 goto ep_fail;
2284 ep->driver_data = fu;
2285 fu->ep_cmd = ep;
2286
2287 /* Assume endpoint addresses are the same for both speeds */
2288 uasp_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2289 uasp_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2290 uasp_status_desc.bEndpointAddress =
2291 uasp_ss_status_desc.bEndpointAddress;
2292 uasp_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2293
2294 uasp_fs_bi_desc.bEndpointAddress = uasp_ss_bi_desc.bEndpointAddress;
2295 uasp_fs_bo_desc.bEndpointAddress = uasp_ss_bo_desc.bEndpointAddress;
2296 uasp_fs_status_desc.bEndpointAddress =
2297 uasp_ss_status_desc.bEndpointAddress;
2298 uasp_fs_cmd_desc.bEndpointAddress = uasp_ss_cmd_desc.bEndpointAddress;
2299
2300 ret = usb_assign_descriptors(f, uasp_fs_function_desc,
2301 uasp_hs_function_desc, uasp_ss_function_desc);
2302 if (ret)
2303 goto ep_fail;
2304
2305 return 0;
2306ep_fail:
2307 pr_err("Can't claim all required eps\n");
2308
2309 give_back_ep(&fu->ep_in);
2310 give_back_ep(&fu->ep_out);
2311 give_back_ep(&fu->ep_status);
2312 give_back_ep(&fu->ep_cmd);
2313 return -ENOTSUPP;
2314}
2315
2316static void usbg_unbind(struct usb_configuration *c, struct usb_function *f)
2317{
2318 struct f_uas *fu = to_f_uas(f);
2319
2320 usb_free_all_descriptors(f);
2321 kfree(fu);
2322}
2323
2324struct guas_setup_wq {
2325 struct work_struct work;
2326 struct f_uas *fu;
2327 unsigned int alt;
2328};
2329
2330static void usbg_delayed_set_alt(struct work_struct *wq)
2331{
2332 struct guas_setup_wq *work = container_of(wq, struct guas_setup_wq,
2333 work);
2334 struct f_uas *fu = work->fu;
2335 int alt = work->alt;
2336
2337 kfree(work);
2338
2339 if (fu->flags & USBG_IS_BOT)
2340 bot_cleanup_old_alt(fu);
2341 if (fu->flags & USBG_IS_UAS)
2342 uasp_cleanup_old_alt(fu);
2343
2344 if (alt == USB_G_ALT_INT_BBB)
2345 bot_set_alt(fu);
2346 else if (alt == USB_G_ALT_INT_UAS)
2347 uasp_set_alt(fu);
2348 usb_composite_setup_continue(fu->function.config->cdev);
2349}
2350
2351static int usbg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
2352{
2353 struct f_uas *fu = to_f_uas(f);
2354
2355 if ((alt == USB_G_ALT_INT_BBB) || (alt == USB_G_ALT_INT_UAS)) {
2356 struct guas_setup_wq *work;
2357
2358 work = kmalloc(sizeof(*work), GFP_ATOMIC);
2359 if (!work)
2360 return -ENOMEM;
2361 INIT_WORK(&work->work, usbg_delayed_set_alt);
2362 work->fu = fu;
2363 work->alt = alt;
2364 schedule_work(&work->work);
2365 return USB_GADGET_DELAYED_STATUS;
2366 }
2367 return -EOPNOTSUPP;
2368}
2369
2370static void usbg_disable(struct usb_function *f)
2371{
2372 struct f_uas *fu = to_f_uas(f);
2373
2374 if (fu->flags & USBG_IS_UAS)
2375 uasp_cleanup_old_alt(fu);
2376 else if (fu->flags & USBG_IS_BOT)
2377 bot_cleanup_old_alt(fu);
2378 fu->flags = 0;
2379}
2380
2381static int usbg_setup(struct usb_function *f,
2382 const struct usb_ctrlrequest *ctrl)
2383{
2384 struct f_uas *fu = to_f_uas(f);
2385
2386 if (!(fu->flags & USBG_IS_BOT))
2387 return -EOPNOTSUPP;
2388
2389 return usbg_bot_setup(f, ctrl);
2390}
2391
2392static int usbg_cfg_bind(struct usb_configuration *c)
2393{
2394 struct f_uas *fu;
2395 int ret;
2396
2397 fu = kzalloc(sizeof(*fu), GFP_KERNEL);
2398 if (!fu)
2399 return -ENOMEM;
2400 fu->function.name = "Target Function";
2401 fu->function.bind = usbg_bind;
2402 fu->function.unbind = usbg_unbind;
2403 fu->function.set_alt = usbg_set_alt;
2404 fu->function.setup = usbg_setup;
2405 fu->function.disable = usbg_disable;
2406 fu->tpg = the_only_tpg_I_currently_have;
2407
2408 bot_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_BBB].id;
2409 uasp_intf_desc.iInterface = usbg_us_strings[USB_G_STR_INT_UAS].id;
2410
2411 ret = usb_add_function(c, &fu->function);
2412 if (ret)
2413 goto err;
2414
2415 return 0;
2416err:
2417 kfree(fu);
2418 return ret;
2419}
2420
2421static int usb_target_bind(struct usb_composite_dev *cdev)
2422{
2423 int ret;
2424
2425 ret = usb_string_ids_tab(cdev, usbg_us_strings);
2426 if (ret)
2427 return ret;
2428
2429 usbg_device_desc.iManufacturer =
2430 usbg_us_strings[USB_GADGET_MANUFACTURER_IDX].id;
2431 usbg_device_desc.iProduct = usbg_us_strings[USB_GADGET_PRODUCT_IDX].id;
2432 usbg_device_desc.iSerialNumber =
2433 usbg_us_strings[USB_GADGET_SERIAL_IDX].id;
2434 usbg_config_driver.iConfiguration =
2435 usbg_us_strings[USB_G_STR_CONFIG].id;
2436
2437 ret = usb_add_config(cdev, &usbg_config_driver,
2438 usbg_cfg_bind);
2439 if (ret)
2440 return ret;
2441 usb_composite_overwrite_options(cdev, &coverwrite);
2442 return 0;
2443}
2444
2445static __refdata struct usb_composite_driver usbg_driver = {
2446 .name = "g_target",
2447 .dev = &usbg_device_desc,
2448 .strings = usbg_strings,
2449 .max_speed = USB_SPEED_SUPER,
2450 .bind = usb_target_bind,
2451 .unbind = guas_unbind,
2452};
2453
2454static int usbg_attach(struct usbg_tpg *tpg)
2455{
2456 return usb_composite_probe(&usbg_driver);
2457}
2458
2459static void usbg_detach(struct usbg_tpg *tpg)
2460{
2461 usb_composite_unregister(&usbg_driver);
2462}
2463
2464static int __init usb_target_gadget_init(void)
2465{
2466 int ret;
2467
2468 ret = usbg_register_configfs();
2469 return ret;
2470}
2471module_init(usb_target_gadget_init);
2472
2473static void __exit usb_target_gadget_exit(void)
2474{
2475 usbg_deregister_configfs();
2476}
2477module_exit(usb_target_gadget_exit);
2478
2479MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
2480MODULE_DESCRIPTION("usb-gadget fabric");
2481MODULE_LICENSE("GPL v2");