1 /*
2 * Xen SCSI backend driver
3 *
4 * Copyright (c) 2008, FUJITSU Limited
5 *
6 * Based on the blkback driver code.
7 * Adaption to kernel taget core infrastructure taken from vhost/scsi.c
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation; or, when distributed
12 * separately from the Linux kernel or incorporated into other
13 * software packages, subject to the following license:
14 *
15 * Permission is hereby granted, free of charge, to any person obtaining a copy
16 * of this source file (the "Software"), to deal in the Software without
17 * restriction, including without limitation the rights to use, copy, modify,
18 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
19 * and to permit persons to whom the Software is furnished to do so, subject to
20 * the following conditions:
21 *
22 * The above copyright notice and this permission notice shall be included in
23 * all copies or substantial portions of the Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
28 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
29 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
30 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
31 * IN THE SOFTWARE.
32 */
33
34 #include <stdarg.h>
35
36 #include <linux/module.h>
37 #include <linux/utsname.h>
38 #include <linux/interrupt.h>
39 #include <linux/slab.h>
40 #include <linux/wait.h>
41 #include <linux/sched.h>
42 #include <linux/list.h>
43 #include <linux/gfp.h>
44 #include <linux/delay.h>
45 #include <linux/spinlock.h>
46 #include <linux/configfs.h>
47
48 #include <generated/utsrelease.h>
49
50 #include <scsi/scsi_dbg.h>
51 #include <scsi/scsi_eh.h>
52 #include <scsi/scsi_tcq.h>
53
54 #include <target/target_core_base.h>
55 #include <target/target_core_fabric.h>
56 #include <target/target_core_configfs.h>
57 #include <target/target_core_fabric_configfs.h>
58
59 #include <asm/hypervisor.h>
60
61 #include <xen/xen.h>
62 #include <xen/balloon.h>
63 #include <xen/events.h>
64 #include <xen/xenbus.h>
65 #include <xen/grant_table.h>
66 #include <xen/page.h>
67
68 #include <xen/interface/grant_table.h>
69 #include <xen/interface/io/vscsiif.h>
70
71 #define DPRINTK(_f, _a...) \
72 pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a)
73
74 #define VSCSI_VERSION "v0.1"
75 #define VSCSI_NAMELEN 32
76
77 struct ids_tuple {
78 unsigned int hst; /* host */
79 unsigned int chn; /* channel */
80 unsigned int tgt; /* target */
81 unsigned int lun; /* LUN */
82 };
83
84 struct v2p_entry {
85 struct ids_tuple v; /* translate from */
86 struct scsiback_tpg *tpg; /* translate to */
87 unsigned int lun;
88 struct kref kref;
89 struct list_head l;
90 };
91
92 struct vscsibk_info {
93 struct xenbus_device *dev;
94
95 domid_t domid;
96 unsigned int irq;
97
98 struct vscsiif_back_ring ring;
99 int ring_error;
100
101 spinlock_t ring_lock;
102 atomic_t nr_unreplied_reqs;
103
104 spinlock_t v2p_lock;
105 struct list_head v2p_entry_lists;
106
107 wait_queue_head_t waiting_to_free;
108 };
109
110 /* theoretical maximum of grants for one request */
111 #define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE)
112
113 /*
114 * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one
115 * call to map/unmap grants. Don't choose it too large, as there are arrays
116 * with VSCSI_GRANT_BATCH elements allocated on the stack.
117 */
118 #define VSCSI_GRANT_BATCH 16
119
120 struct vscsibk_pend {
121 uint16_t rqid;
122
123 uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE];
124 uint8_t cmd_len;
125
126 uint8_t sc_data_direction;
127 uint16_t n_sg; /* real length of SG list */
128 uint16_t n_grants; /* SG pages and potentially SG list */
129 uint32_t data_len;
130 uint32_t result;
131
132 struct vscsibk_info *info;
133 struct v2p_entry *v2p;
134 struct scatterlist *sgl;
135
136 uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE];
137
138 grant_handle_t grant_handles[VSCSI_MAX_GRANTS];
139 struct page *pages[VSCSI_MAX_GRANTS];
140
141 struct se_cmd se_cmd;
142 };
143
144 struct scsiback_tmr {
145 atomic_t tmr_complete;
146 wait_queue_head_t tmr_wait;
147 };
148
149 struct scsiback_nexus {
150 /* Pointer to TCM session for I_T Nexus */
151 struct se_session *tvn_se_sess;
152 };
153
154 struct scsiback_tport {
155 /* SCSI protocol the tport is providing */
156 u8 tport_proto_id;
157 /* Binary World Wide unique Port Name for pvscsi Target port */
158 u64 tport_wwpn;
159 /* ASCII formatted WWPN for pvscsi Target port */
160 char tport_name[VSCSI_NAMELEN];
161 /* Returned by scsiback_make_tport() */
162 struct se_wwn tport_wwn;
163 };
164
165 struct scsiback_tpg {
166 /* scsiback port target portal group tag for TCM */
167 u16 tport_tpgt;
168 /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */
169 int tv_tpg_port_count;
170 /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */
171 int tv_tpg_fe_count;
172 /* list for scsiback_list */
173 struct list_head tv_tpg_list;
174 /* Used to protect access for tpg_nexus */
175 struct mutex tv_tpg_mutex;
176 /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */
177 struct scsiback_nexus *tpg_nexus;
178 /* Pointer back to scsiback_tport */
179 struct scsiback_tport *tport;
180 /* Returned by scsiback_make_tpg() */
181 struct se_portal_group se_tpg;
182 /* alias used in xenstore */
183 char param_alias[VSCSI_NAMELEN];
184 /* list of info structures related to this target portal group */
185 struct list_head info_list;
186 };
187
188 #define SCSIBACK_INVALID_HANDLE (~0)
189
190 static bool log_print_stat;
191 module_param(log_print_stat, bool, 0644);
192
193 static int scsiback_max_buffer_pages = 1024;
194 module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644);
195 MODULE_PARM_DESC(max_buffer_pages,
196 "Maximum number of free pages to keep in backend buffer");
197
198 static struct kmem_cache *scsiback_cachep;
199 static DEFINE_SPINLOCK(free_pages_lock);
200 static int free_pages_num;
201 static LIST_HEAD(scsiback_free_pages);
202
203 /* Global spinlock to protect scsiback TPG list */
204 static DEFINE_MUTEX(scsiback_mutex);
205 static LIST_HEAD(scsiback_list);
206
207 /* Local pointer to allocated TCM configfs fabric module */
208 static struct target_fabric_configfs *scsiback_fabric_configfs;
209
scsiback_get(struct vscsibk_info * info)210 static void scsiback_get(struct vscsibk_info *info)
211 {
212 atomic_inc(&info->nr_unreplied_reqs);
213 }
214
scsiback_put(struct vscsibk_info * info)215 static void scsiback_put(struct vscsibk_info *info)
216 {
217 if (atomic_dec_and_test(&info->nr_unreplied_reqs))
218 wake_up(&info->waiting_to_free);
219 }
220
put_free_pages(struct page ** page,int num)221 static void put_free_pages(struct page **page, int num)
222 {
223 unsigned long flags;
224 int i = free_pages_num + num, n = num;
225
226 if (num == 0)
227 return;
228 if (i > scsiback_max_buffer_pages) {
229 n = min(num, i - scsiback_max_buffer_pages);
230 free_xenballooned_pages(n, page + num - n);
231 n = num - n;
232 }
233 spin_lock_irqsave(&free_pages_lock, flags);
234 for (i = 0; i < n; i++)
235 list_add(&page[i]->lru, &scsiback_free_pages);
236 free_pages_num += n;
237 spin_unlock_irqrestore(&free_pages_lock, flags);
238 }
239
get_free_page(struct page ** page)240 static int get_free_page(struct page **page)
241 {
242 unsigned long flags;
243
244 spin_lock_irqsave(&free_pages_lock, flags);
245 if (list_empty(&scsiback_free_pages)) {
246 spin_unlock_irqrestore(&free_pages_lock, flags);
247 return alloc_xenballooned_pages(1, page, false);
248 }
249 page[0] = list_first_entry(&scsiback_free_pages, struct page, lru);
250 list_del(&page[0]->lru);
251 free_pages_num--;
252 spin_unlock_irqrestore(&free_pages_lock, flags);
253 return 0;
254 }
255
vaddr_page(struct page * page)256 static unsigned long vaddr_page(struct page *page)
257 {
258 unsigned long pfn = page_to_pfn(page);
259
260 return (unsigned long)pfn_to_kaddr(pfn);
261 }
262
vaddr(struct vscsibk_pend * req,int seg)263 static unsigned long vaddr(struct vscsibk_pend *req, int seg)
264 {
265 return vaddr_page(req->pages[seg]);
266 }
267
scsiback_print_status(char * sense_buffer,int errors,struct vscsibk_pend * pending_req)268 static void scsiback_print_status(char *sense_buffer, int errors,
269 struct vscsibk_pend *pending_req)
270 {
271 struct scsiback_tpg *tpg = pending_req->v2p->tpg;
272
273 pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
274 tpg->tport->tport_name, pending_req->v2p->lun,
275 pending_req->cmnd[0], status_byte(errors), msg_byte(errors),
276 host_byte(errors), driver_byte(errors));
277
278 if (CHECK_CONDITION & status_byte(errors))
279 __scsi_print_sense("xen-pvscsi", sense_buffer,
280 SCSI_SENSE_BUFFERSIZE);
281 }
282
scsiback_fast_flush_area(struct vscsibk_pend * req)283 static void scsiback_fast_flush_area(struct vscsibk_pend *req)
284 {
285 struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH];
286 struct page *pages[VSCSI_GRANT_BATCH];
287 unsigned int i, invcount = 0;
288 grant_handle_t handle;
289 int err;
290
291 kfree(req->sgl);
292 req->sgl = NULL;
293 req->n_sg = 0;
294
295 if (!req->n_grants)
296 return;
297
298 for (i = 0; i < req->n_grants; i++) {
299 handle = req->grant_handles[i];
300 if (handle == SCSIBACK_INVALID_HANDLE)
301 continue;
302 gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i),
303 GNTMAP_host_map, handle);
304 req->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
305 pages[invcount] = req->pages[i];
306 put_page(pages[invcount]);
307 invcount++;
308 if (invcount < VSCSI_GRANT_BATCH)
309 continue;
310 err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
311 BUG_ON(err);
312 invcount = 0;
313 }
314
315 if (invcount) {
316 err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
317 BUG_ON(err);
318 }
319
320 put_free_pages(req->pages, req->n_grants);
321 req->n_grants = 0;
322 }
323
scsiback_free_translation_entry(struct kref * kref)324 static void scsiback_free_translation_entry(struct kref *kref)
325 {
326 struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref);
327 struct scsiback_tpg *tpg = entry->tpg;
328
329 mutex_lock(&tpg->tv_tpg_mutex);
330 tpg->tv_tpg_fe_count--;
331 mutex_unlock(&tpg->tv_tpg_mutex);
332
333 kfree(entry);
334 }
335
scsiback_do_resp_with_sense(char * sense_buffer,int32_t result,uint32_t resid,struct vscsibk_pend * pending_req)336 static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result,
337 uint32_t resid, struct vscsibk_pend *pending_req)
338 {
339 struct vscsiif_response *ring_res;
340 struct vscsibk_info *info = pending_req->info;
341 int notify;
342 struct scsi_sense_hdr sshdr;
343 unsigned long flags;
344 unsigned len;
345
346 spin_lock_irqsave(&info->ring_lock, flags);
347
348 ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt);
349 info->ring.rsp_prod_pvt++;
350
351 ring_res->rslt = result;
352 ring_res->rqid = pending_req->rqid;
353
354 if (sense_buffer != NULL &&
355 scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE,
356 &sshdr)) {
357 len = min_t(unsigned, 8 + sense_buffer[7],
358 VSCSIIF_SENSE_BUFFERSIZE);
359 memcpy(ring_res->sense_buffer, sense_buffer, len);
360 ring_res->sense_len = len;
361 } else {
362 ring_res->sense_len = 0;
363 }
364
365 ring_res->residual_len = resid;
366
367 RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify);
368 spin_unlock_irqrestore(&info->ring_lock, flags);
369
370 if (notify)
371 notify_remote_via_irq(info->irq);
372
373 if (pending_req->v2p)
374 kref_put(&pending_req->v2p->kref,
375 scsiback_free_translation_entry);
376 }
377
scsiback_cmd_done(struct vscsibk_pend * pending_req)378 static void scsiback_cmd_done(struct vscsibk_pend *pending_req)
379 {
380 struct vscsibk_info *info = pending_req->info;
381 unsigned char *sense_buffer;
382 unsigned int resid;
383 int errors;
384
385 sense_buffer = pending_req->sense_buffer;
386 resid = pending_req->se_cmd.residual_count;
387 errors = pending_req->result;
388
389 if (errors && log_print_stat)
390 scsiback_print_status(sense_buffer, errors, pending_req);
391
392 scsiback_fast_flush_area(pending_req);
393 scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req);
394 scsiback_put(info);
395 }
396
scsiback_cmd_exec(struct vscsibk_pend * pending_req)397 static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
398 {
399 struct se_cmd *se_cmd = &pending_req->se_cmd;
400 struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess;
401 int rc;
402
403 memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE);
404
405 memset(se_cmd, 0, sizeof(*se_cmd));
406
407 scsiback_get(pending_req->info);
408 rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd,
409 pending_req->sense_buffer, pending_req->v2p->lun,
410 pending_req->data_len, 0,
411 pending_req->sc_data_direction, 0,
412 pending_req->sgl, pending_req->n_sg,
413 NULL, 0, NULL, 0);
414 if (rc < 0) {
415 transport_send_check_condition_and_sense(se_cmd,
416 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
417 transport_generic_free_cmd(se_cmd, 0);
418 }
419 }
420
scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref * map,struct page ** pg,grant_handle_t * grant,int cnt)421 static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
422 struct page **pg, grant_handle_t *grant, int cnt)
423 {
424 int err, i;
425
426 if (!cnt)
427 return 0;
428
429 err = gnttab_map_refs(map, NULL, pg, cnt);
430 BUG_ON(err);
431 for (i = 0; i < cnt; i++) {
432 if (unlikely(map[i].status != GNTST_okay)) {
433 pr_err("xen-pvscsi: invalid buffer -- could not remap it\n");
434 map[i].handle = SCSIBACK_INVALID_HANDLE;
435 err = -ENOMEM;
436 } else {
437 get_page(pg[i]);
438 }
439 grant[i] = map[i].handle;
440 }
441 return err;
442 }
443
scsiback_gnttab_data_map_list(struct vscsibk_pend * pending_req,struct scsiif_request_segment * seg,struct page ** pg,grant_handle_t * grant,int cnt,u32 flags)444 static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req,
445 struct scsiif_request_segment *seg, struct page **pg,
446 grant_handle_t *grant, int cnt, u32 flags)
447 {
448 int mapcount = 0, i, err = 0;
449 struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH];
450 struct vscsibk_info *info = pending_req->info;
451
452 for (i = 0; i < cnt; i++) {
453 if (get_free_page(pg + mapcount)) {
454 put_free_pages(pg, mapcount);
455 pr_err("xen-pvscsi: no grant page\n");
456 return -ENOMEM;
457 }
458 gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
459 flags, seg[i].gref, info->domid);
460 mapcount++;
461 if (mapcount < VSCSI_GRANT_BATCH)
462 continue;
463 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
464 pg += mapcount;
465 grant += mapcount;
466 pending_req->n_grants += mapcount;
467 if (err)
468 return err;
469 mapcount = 0;
470 }
471 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
472 pending_req->n_grants += mapcount;
473 return err;
474 }
475
scsiback_gnttab_data_map(struct vscsiif_request * ring_req,struct vscsibk_pend * pending_req)476 static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
477 struct vscsibk_pend *pending_req)
478 {
479 u32 flags;
480 int i, err, n_segs, i_seg = 0;
481 struct page **pg;
482 struct scsiif_request_segment *seg;
483 unsigned long end_seg = 0;
484 unsigned int nr_segments = (unsigned int)ring_req->nr_segments;
485 unsigned int nr_sgl = 0;
486 struct scatterlist *sg;
487 grant_handle_t *grant;
488
489 pending_req->n_sg = 0;
490 pending_req->n_grants = 0;
491 pending_req->data_len = 0;
492
493 nr_segments &= ~VSCSIIF_SG_GRANT;
494 if (!nr_segments)
495 return 0;
496
497 if (nr_segments > VSCSIIF_SG_TABLESIZE) {
498 DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n",
499 ring_req->nr_segments);
500 return -EINVAL;
501 }
502
503 if (ring_req->nr_segments & VSCSIIF_SG_GRANT) {
504 err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg,
505 pending_req->pages, pending_req->grant_handles,
506 nr_segments, GNTMAP_host_map | GNTMAP_readonly);
507 if (err)
508 return err;
509 nr_sgl = nr_segments;
510 nr_segments = 0;
511 for (i = 0; i < nr_sgl; i++) {
512 n_segs = ring_req->seg[i].length /
513 sizeof(struct scsiif_request_segment);
514 if ((unsigned)ring_req->seg[i].offset +
515 (unsigned)ring_req->seg[i].length > PAGE_SIZE ||
516 n_segs * sizeof(struct scsiif_request_segment) !=
517 ring_req->seg[i].length)
518 return -EINVAL;
519 nr_segments += n_segs;
520 }
521 if (nr_segments > SG_ALL) {
522 DPRINTK("xen-pvscsi: invalid nr_seg = %d\n",
523 nr_segments);
524 return -EINVAL;
525 }
526 }
527
528 /* free of (sgl) in fast_flush_area()*/
529 pending_req->sgl = kmalloc_array(nr_segments,
530 sizeof(struct scatterlist), GFP_KERNEL);
531 if (!pending_req->sgl)
532 return -ENOMEM;
533
534 sg_init_table(pending_req->sgl, nr_segments);
535 pending_req->n_sg = nr_segments;
536
537 flags = GNTMAP_host_map;
538 if (pending_req->sc_data_direction == DMA_TO_DEVICE)
539 flags |= GNTMAP_readonly;
540
541 pg = pending_req->pages + nr_sgl;
542 grant = pending_req->grant_handles + nr_sgl;
543 if (!nr_sgl) {
544 seg = ring_req->seg;
545 err = scsiback_gnttab_data_map_list(pending_req, seg,
546 pg, grant, nr_segments, flags);
547 if (err)
548 return err;
549 } else {
550 for (i = 0; i < nr_sgl; i++) {
551 seg = (struct scsiif_request_segment *)(
552 vaddr(pending_req, i) + ring_req->seg[i].offset);
553 n_segs = ring_req->seg[i].length /
554 sizeof(struct scsiif_request_segment);
555 err = scsiback_gnttab_data_map_list(pending_req, seg,
556 pg, grant, n_segs, flags);
557 if (err)
558 return err;
559 pg += n_segs;
560 grant += n_segs;
561 }
562 end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset;
563 seg = (struct scsiif_request_segment *)end_seg;
564 end_seg += ring_req->seg[0].length;
565 pg = pending_req->pages + nr_sgl;
566 }
567
568 for_each_sg(pending_req->sgl, sg, nr_segments, i) {
569 sg_set_page(sg, pg[i], seg->length, seg->offset);
570 pending_req->data_len += seg->length;
571 seg++;
572 if (nr_sgl && (unsigned long)seg >= end_seg) {
573 i_seg++;
574 end_seg = vaddr(pending_req, i_seg) +
575 ring_req->seg[i_seg].offset;
576 seg = (struct scsiif_request_segment *)end_seg;
577 end_seg += ring_req->seg[i_seg].length;
578 }
579 if (sg->offset >= PAGE_SIZE ||
580 sg->length > PAGE_SIZE ||
581 sg->offset + sg->length > PAGE_SIZE)
582 return -EINVAL;
583 }
584
585 return 0;
586 }
587
scsiback_disconnect(struct vscsibk_info * info)588 static void scsiback_disconnect(struct vscsibk_info *info)
589 {
590 wait_event(info->waiting_to_free,
591 atomic_read(&info->nr_unreplied_reqs) == 0);
592
593 unbind_from_irqhandler(info->irq, info);
594 info->irq = 0;
595 xenbus_unmap_ring_vfree(info->dev, info->ring.sring);
596 }
597
scsiback_device_action(struct vscsibk_pend * pending_req,enum tcm_tmreq_table act,int tag)598 static void scsiback_device_action(struct vscsibk_pend *pending_req,
599 enum tcm_tmreq_table act, int tag)
600 {
601 int rc, err = FAILED;
602 struct scsiback_tpg *tpg = pending_req->v2p->tpg;
603 struct se_cmd *se_cmd = &pending_req->se_cmd;
604 struct scsiback_tmr *tmr;
605
606 tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL);
607 if (!tmr)
608 goto out;
609
610 init_waitqueue_head(&tmr->tmr_wait);
611
612 transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo,
613 tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, MSG_SIMPLE_TAG,
614 &pending_req->sense_buffer[0]);
615
616 rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL);
617 if (rc < 0)
618 goto out;
619
620 se_cmd->se_tmr_req->ref_task_tag = tag;
621
622 if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0)
623 goto out;
624
625 transport_generic_handle_tmr(se_cmd);
626 wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete));
627
628 err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
629 SUCCESS : FAILED;
630
631 out:
632 if (tmr) {
633 transport_generic_free_cmd(&pending_req->se_cmd, 1);
634 kfree(tmr);
635 }
636
637 scsiback_do_resp_with_sense(NULL, err, 0, pending_req);
638
639 kmem_cache_free(scsiback_cachep, pending_req);
640 }
641
642 /*
643 Perform virtual to physical translation
644 */
scsiback_do_translation(struct vscsibk_info * info,struct ids_tuple * v)645 static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info,
646 struct ids_tuple *v)
647 {
648 struct v2p_entry *entry;
649 struct list_head *head = &(info->v2p_entry_lists);
650 unsigned long flags;
651
652 spin_lock_irqsave(&info->v2p_lock, flags);
653 list_for_each_entry(entry, head, l) {
654 if ((entry->v.chn == v->chn) &&
655 (entry->v.tgt == v->tgt) &&
656 (entry->v.lun == v->lun)) {
657 kref_get(&entry->kref);
658 goto out;
659 }
660 }
661 entry = NULL;
662
663 out:
664 spin_unlock_irqrestore(&info->v2p_lock, flags);
665 return entry;
666 }
667
prepare_pending_reqs(struct vscsibk_info * info,struct vscsiif_request * ring_req,struct vscsibk_pend * pending_req)668 static int prepare_pending_reqs(struct vscsibk_info *info,
669 struct vscsiif_request *ring_req,
670 struct vscsibk_pend *pending_req)
671 {
672 struct v2p_entry *v2p;
673 struct ids_tuple vir;
674
675 pending_req->rqid = ring_req->rqid;
676 pending_req->info = info;
677
678 vir.chn = ring_req->channel;
679 vir.tgt = ring_req->id;
680 vir.lun = ring_req->lun;
681
682 v2p = scsiback_do_translation(info, &vir);
683 if (!v2p) {
684 pending_req->v2p = NULL;
685 DPRINTK("xen-pvscsi: doesn't exist.\n");
686 return -ENODEV;
687 }
688 pending_req->v2p = v2p;
689
690 /* request range check from frontend */
691 pending_req->sc_data_direction = ring_req->sc_data_direction;
692 if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) &&
693 (pending_req->sc_data_direction != DMA_TO_DEVICE) &&
694 (pending_req->sc_data_direction != DMA_FROM_DEVICE) &&
695 (pending_req->sc_data_direction != DMA_NONE)) {
696 DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n",
697 pending_req->sc_data_direction);
698 return -EINVAL;
699 }
700
701 pending_req->cmd_len = ring_req->cmd_len;
702 if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
703 DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n",
704 pending_req->cmd_len);
705 return -EINVAL;
706 }
707 memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len);
708
709 return 0;
710 }
711
scsiback_do_cmd_fn(struct vscsibk_info * info)712 static int scsiback_do_cmd_fn(struct vscsibk_info *info)
713 {
714 struct vscsiif_back_ring *ring = &info->ring;
715 struct vscsiif_request ring_req;
716 struct vscsibk_pend *pending_req;
717 RING_IDX rc, rp;
718 int err, more_to_do;
719 uint32_t result;
720
721 rc = ring->req_cons;
722 rp = ring->sring->req_prod;
723 rmb(); /* guest system is accessing ring, too */
724
725 if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) {
726 rc = ring->rsp_prod_pvt;
727 pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
728 info->domid, rp, rc, rp - rc);
729 info->ring_error = 1;
730 return 0;
731 }
732
733 while ((rc != rp)) {
734 if (RING_REQUEST_CONS_OVERFLOW(ring, rc))
735 break;
736 pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL);
737 if (!pending_req)
738 return 1;
739
740 ring_req = *RING_GET_REQUEST(ring, rc);
741 ring->req_cons = ++rc;
742
743 err = prepare_pending_reqs(info, &ring_req, pending_req);
744 if (err) {
745 switch (err) {
746 case -ENODEV:
747 result = DID_NO_CONNECT;
748 break;
749 default:
750 result = DRIVER_ERROR;
751 break;
752 }
753 scsiback_do_resp_with_sense(NULL, result << 24, 0,
754 pending_req);
755 kmem_cache_free(scsiback_cachep, pending_req);
756 return 1;
757 }
758
759 switch (ring_req.act) {
760 case VSCSIIF_ACT_SCSI_CDB:
761 if (scsiback_gnttab_data_map(&ring_req, pending_req)) {
762 scsiback_fast_flush_area(pending_req);
763 scsiback_do_resp_with_sense(NULL,
764 DRIVER_ERROR << 24, 0, pending_req);
765 kmem_cache_free(scsiback_cachep, pending_req);
766 } else {
767 scsiback_cmd_exec(pending_req);
768 }
769 break;
770 case VSCSIIF_ACT_SCSI_ABORT:
771 scsiback_device_action(pending_req, TMR_ABORT_TASK,
772 ring_req.ref_rqid);
773 break;
774 case VSCSIIF_ACT_SCSI_RESET:
775 scsiback_device_action(pending_req, TMR_LUN_RESET, 0);
776 break;
777 default:
778 pr_err_ratelimited("xen-pvscsi: invalid request\n");
779 scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24,
780 0, pending_req);
781 kmem_cache_free(scsiback_cachep, pending_req);
782 break;
783 }
784
785 /* Yield point for this unbounded loop. */
786 cond_resched();
787 }
788
789 RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do);
790 return more_to_do;
791 }
792
scsiback_irq_fn(int irq,void * dev_id)793 static irqreturn_t scsiback_irq_fn(int irq, void *dev_id)
794 {
795 struct vscsibk_info *info = dev_id;
796
797 if (info->ring_error)
798 return IRQ_HANDLED;
799
800 while (scsiback_do_cmd_fn(info))
801 cond_resched();
802
803 return IRQ_HANDLED;
804 }
805
scsiback_init_sring(struct vscsibk_info * info,grant_ref_t ring_ref,evtchn_port_t evtchn)806 static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref,
807 evtchn_port_t evtchn)
808 {
809 void *area;
810 struct vscsiif_sring *sring;
811 int err;
812
813 if (info->irq)
814 return -1;
815
816 err = xenbus_map_ring_valloc(info->dev, ring_ref, &area);
817 if (err)
818 return err;
819
820 sring = (struct vscsiif_sring *)area;
821 BACK_RING_INIT(&info->ring, sring, PAGE_SIZE);
822
823 err = bind_interdomain_evtchn_to_irq(info->domid, evtchn);
824 if (err < 0)
825 goto unmap_page;
826
827 info->irq = err;
828
829 err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn,
830 IRQF_ONESHOT, "vscsiif-backend", info);
831 if (err)
832 goto free_irq;
833
834 return 0;
835
836 free_irq:
837 unbind_from_irqhandler(info->irq, info);
838 info->irq = 0;
839 unmap_page:
840 xenbus_unmap_ring_vfree(info->dev, area);
841
842 return err;
843 }
844
scsiback_map(struct vscsibk_info * info)845 static int scsiback_map(struct vscsibk_info *info)
846 {
847 struct xenbus_device *dev = info->dev;
848 unsigned int ring_ref, evtchn;
849 int err;
850
851 err = xenbus_gather(XBT_NIL, dev->otherend,
852 "ring-ref", "%u", &ring_ref,
853 "event-channel", "%u", &evtchn, NULL);
854 if (err) {
855 xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend);
856 return err;
857 }
858
859 return scsiback_init_sring(info, ring_ref, evtchn);
860 }
861
862 /*
863 Add a new translation entry
864 */
scsiback_add_translation_entry(struct vscsibk_info * info,char * phy,struct ids_tuple * v)865 static int scsiback_add_translation_entry(struct vscsibk_info *info,
866 char *phy, struct ids_tuple *v)
867 {
868 int err = 0;
869 struct v2p_entry *entry;
870 struct v2p_entry *new;
871 struct list_head *head = &(info->v2p_entry_lists);
872 unsigned long flags;
873 char *lunp;
874 unsigned int lun;
875 struct scsiback_tpg *tpg_entry, *tpg = NULL;
876 char *error = "doesn't exist";
877
878 lunp = strrchr(phy, ':');
879 if (!lunp) {
880 pr_err("xen-pvscsi: illegal format of physical device %s\n",
881 phy);
882 return -EINVAL;
883 }
884 *lunp = 0;
885 lunp++;
886 if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
887 pr_err("xen-pvscsi: lun number not valid: %s\n", lunp);
888 return -EINVAL;
889 }
890
891 mutex_lock(&scsiback_mutex);
892 list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) {
893 if (!strcmp(phy, tpg_entry->tport->tport_name) ||
894 !strcmp(phy, tpg_entry->param_alias)) {
895 spin_lock(&tpg_entry->se_tpg.tpg_lun_lock);
896 if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status ==
897 TRANSPORT_LUN_STATUS_ACTIVE) {
898 if (!tpg_entry->tpg_nexus)
899 error = "nexus undefined";
900 else
901 tpg = tpg_entry;
902 }
903 spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock);
904 break;
905 }
906 }
907 if (tpg) {
908 mutex_lock(&tpg->tv_tpg_mutex);
909 tpg->tv_tpg_fe_count++;
910 mutex_unlock(&tpg->tv_tpg_mutex);
911 }
912 mutex_unlock(&scsiback_mutex);
913
914 if (!tpg) {
915 pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error);
916 return -ENODEV;
917 }
918
919 new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL);
920 if (new == NULL) {
921 err = -ENOMEM;
922 goto out_free;
923 }
924
925 spin_lock_irqsave(&info->v2p_lock, flags);
926
927 /* Check double assignment to identical virtual ID */
928 list_for_each_entry(entry, head, l) {
929 if ((entry->v.chn == v->chn) &&
930 (entry->v.tgt == v->tgt) &&
931 (entry->v.lun == v->lun)) {
932 pr_warn("xen-pvscsi: Virtual ID is already used. Assignment was not performed.\n");
933 err = -EEXIST;
934 goto out;
935 }
936
937 }
938
939 /* Create a new translation entry and add to the list */
940 kref_init(&new->kref);
941 new->v = *v;
942 new->tpg = tpg;
943 new->lun = lun;
944 list_add_tail(&new->l, head);
945
946 out:
947 spin_unlock_irqrestore(&info->v2p_lock, flags);
948
949 out_free:
950 if (err) {
951 mutex_lock(&tpg->tv_tpg_mutex);
952 tpg->tv_tpg_fe_count--;
953 mutex_unlock(&tpg->tv_tpg_mutex);
954 kfree(new);
955 }
956
957 return err;
958 }
959
__scsiback_del_translation_entry(struct v2p_entry * entry)960 static void __scsiback_del_translation_entry(struct v2p_entry *entry)
961 {
962 list_del(&entry->l);
963 kref_put(&entry->kref, scsiback_free_translation_entry);
964 }
965
966 /*
967 Delete the translation entry specfied
968 */
scsiback_del_translation_entry(struct vscsibk_info * info,struct ids_tuple * v)969 static int scsiback_del_translation_entry(struct vscsibk_info *info,
970 struct ids_tuple *v)
971 {
972 struct v2p_entry *entry;
973 struct list_head *head = &(info->v2p_entry_lists);
974 unsigned long flags;
975
976 spin_lock_irqsave(&info->v2p_lock, flags);
977 /* Find out the translation entry specified */
978 list_for_each_entry(entry, head, l) {
979 if ((entry->v.chn == v->chn) &&
980 (entry->v.tgt == v->tgt) &&
981 (entry->v.lun == v->lun)) {
982 goto found;
983 }
984 }
985
986 spin_unlock_irqrestore(&info->v2p_lock, flags);
987 return 1;
988
989 found:
990 /* Delete the translation entry specfied */
991 __scsiback_del_translation_entry(entry);
992
993 spin_unlock_irqrestore(&info->v2p_lock, flags);
994 return 0;
995 }
996
scsiback_do_add_lun(struct vscsibk_info * info,const char * state,char * phy,struct ids_tuple * vir)997 static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
998 char *phy, struct ids_tuple *vir)
999 {
1000 if (!scsiback_add_translation_entry(info, phy, vir)) {
1001 if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
1002 "%d", XenbusStateInitialised)) {
1003 pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
1004 scsiback_del_translation_entry(info, vir);
1005 }
1006 } else {
1007 xenbus_printf(XBT_NIL, info->dev->nodename, state,
1008 "%d", XenbusStateClosed);
1009 }
1010 }
1011
scsiback_do_del_lun(struct vscsibk_info * info,const char * state,struct ids_tuple * vir)1012 static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state,
1013 struct ids_tuple *vir)
1014 {
1015 if (!scsiback_del_translation_entry(info, vir)) {
1016 if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
1017 "%d", XenbusStateClosed))
1018 pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
1019 }
1020 }
1021
1022 #define VSCSIBACK_OP_ADD_OR_DEL_LUN 1
1023 #define VSCSIBACK_OP_UPDATEDEV_STATE 2
1024
scsiback_do_1lun_hotplug(struct vscsibk_info * info,int op,char * ent)1025 static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
1026 char *ent)
1027 {
1028 int err;
1029 struct ids_tuple vir;
1030 char *val;
1031 int device_state;
1032 char phy[VSCSI_NAMELEN];
1033 char str[64];
1034 char state[64];
1035 struct xenbus_device *dev = info->dev;
1036
1037 /* read status */
1038 snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent);
1039 err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state);
1040 if (XENBUS_EXIST_ERR(err))
1041 return;
1042
1043 /* physical SCSI device */
1044 snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent);
1045 val = xenbus_read(XBT_NIL, dev->nodename, str, NULL);
1046 if (IS_ERR(val)) {
1047 xenbus_printf(XBT_NIL, dev->nodename, state,
1048 "%d", XenbusStateClosed);
1049 return;
1050 }
1051 strlcpy(phy, val, VSCSI_NAMELEN);
1052 kfree(val);
1053
1054 /* virtual SCSI device */
1055 snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent);
1056 err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u",
1057 &vir.hst, &vir.chn, &vir.tgt, &vir.lun);
1058 if (XENBUS_EXIST_ERR(err)) {
1059 xenbus_printf(XBT_NIL, dev->nodename, state,
1060 "%d", XenbusStateClosed);
1061 return;
1062 }
1063
1064 switch (op) {
1065 case VSCSIBACK_OP_ADD_OR_DEL_LUN:
1066 if (device_state == XenbusStateInitialising)
1067 scsiback_do_add_lun(info, state, phy, &vir);
1068 if (device_state == XenbusStateClosing)
1069 scsiback_do_del_lun(info, state, &vir);
1070 break;
1071
1072 case VSCSIBACK_OP_UPDATEDEV_STATE:
1073 if (device_state == XenbusStateInitialised) {
1074 /* modify vscsi-devs/dev-x/state */
1075 if (xenbus_printf(XBT_NIL, dev->nodename, state,
1076 "%d", XenbusStateConnected)) {
1077 pr_err("xen-pvscsi: xenbus_printf error %s\n",
1078 str);
1079 scsiback_del_translation_entry(info, &vir);
1080 xenbus_printf(XBT_NIL, dev->nodename, state,
1081 "%d", XenbusStateClosed);
1082 }
1083 }
1084 break;
1085 /*When it is necessary, processing is added here.*/
1086 default:
1087 break;
1088 }
1089 }
1090
scsiback_do_lun_hotplug(struct vscsibk_info * info,int op)1091 static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op)
1092 {
1093 int i;
1094 char **dir;
1095 unsigned int ndir = 0;
1096
1097 dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs",
1098 &ndir);
1099 if (IS_ERR(dir))
1100 return;
1101
1102 for (i = 0; i < ndir; i++)
1103 scsiback_do_1lun_hotplug(info, op, dir[i]);
1104
1105 kfree(dir);
1106 }
1107
scsiback_frontend_changed(struct xenbus_device * dev,enum xenbus_state frontend_state)1108 static void scsiback_frontend_changed(struct xenbus_device *dev,
1109 enum xenbus_state frontend_state)
1110 {
1111 struct vscsibk_info *info = dev_get_drvdata(&dev->dev);
1112
1113 switch (frontend_state) {
1114 case XenbusStateInitialising:
1115 break;
1116
1117 case XenbusStateInitialised:
1118 if (scsiback_map(info))
1119 break;
1120
1121 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN);
1122 xenbus_switch_state(dev, XenbusStateConnected);
1123 break;
1124
1125 case XenbusStateConnected:
1126 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE);
1127
1128 if (dev->state == XenbusStateConnected)
1129 break;
1130
1131 xenbus_switch_state(dev, XenbusStateConnected);
1132 break;
1133
1134 case XenbusStateClosing:
1135 if (info->irq)
1136 scsiback_disconnect(info);
1137
1138 xenbus_switch_state(dev, XenbusStateClosing);
1139 break;
1140
1141 case XenbusStateClosed:
1142 xenbus_switch_state(dev, XenbusStateClosed);
1143 if (xenbus_dev_is_online(dev))
1144 break;
1145 /* fall through if not online */
1146 case XenbusStateUnknown:
1147 device_unregister(&dev->dev);
1148 break;
1149
1150 case XenbusStateReconfiguring:
1151 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN);
1152 xenbus_switch_state(dev, XenbusStateReconfigured);
1153
1154 break;
1155
1156 default:
1157 xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
1158 frontend_state);
1159 break;
1160 }
1161 }
1162
1163 /*
1164 Release the translation entry specfied
1165 */
scsiback_release_translation_entry(struct vscsibk_info * info)1166 static void scsiback_release_translation_entry(struct vscsibk_info *info)
1167 {
1168 struct v2p_entry *entry, *tmp;
1169 struct list_head *head = &(info->v2p_entry_lists);
1170 unsigned long flags;
1171
1172 spin_lock_irqsave(&info->v2p_lock, flags);
1173
1174 list_for_each_entry_safe(entry, tmp, head, l)
1175 __scsiback_del_translation_entry(entry);
1176
1177 spin_unlock_irqrestore(&info->v2p_lock, flags);
1178 }
1179
scsiback_remove(struct xenbus_device * dev)1180 static int scsiback_remove(struct xenbus_device *dev)
1181 {
1182 struct vscsibk_info *info = dev_get_drvdata(&dev->dev);
1183
1184 if (info->irq)
1185 scsiback_disconnect(info);
1186
1187 scsiback_release_translation_entry(info);
1188
1189 dev_set_drvdata(&dev->dev, NULL);
1190
1191 return 0;
1192 }
1193
scsiback_probe(struct xenbus_device * dev,const struct xenbus_device_id * id)1194 static int scsiback_probe(struct xenbus_device *dev,
1195 const struct xenbus_device_id *id)
1196 {
1197 int err;
1198
1199 struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info),
1200 GFP_KERNEL);
1201
1202 DPRINTK("%p %d\n", dev, dev->otherend_id);
1203
1204 if (!info) {
1205 xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure");
1206 return -ENOMEM;
1207 }
1208 info->dev = dev;
1209 dev_set_drvdata(&dev->dev, info);
1210
1211 info->domid = dev->otherend_id;
1212 spin_lock_init(&info->ring_lock);
1213 info->ring_error = 0;
1214 atomic_set(&info->nr_unreplied_reqs, 0);
1215 init_waitqueue_head(&info->waiting_to_free);
1216 info->dev = dev;
1217 info->irq = 0;
1218 INIT_LIST_HEAD(&info->v2p_entry_lists);
1219 spin_lock_init(&info->v2p_lock);
1220
1221 err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u",
1222 SG_ALL);
1223 if (err)
1224 xenbus_dev_error(dev, err, "writing feature-sg-grant");
1225
1226 err = xenbus_switch_state(dev, XenbusStateInitWait);
1227 if (err)
1228 goto fail;
1229
1230 return 0;
1231
1232 fail:
1233 pr_warn("xen-pvscsi: %s failed\n", __func__);
1234 scsiback_remove(dev);
1235
1236 return err;
1237 }
1238
scsiback_dump_proto_id(struct scsiback_tport * tport)1239 static char *scsiback_dump_proto_id(struct scsiback_tport *tport)
1240 {
1241 switch (tport->tport_proto_id) {
1242 case SCSI_PROTOCOL_SAS:
1243 return "SAS";
1244 case SCSI_PROTOCOL_FCP:
1245 return "FCP";
1246 case SCSI_PROTOCOL_ISCSI:
1247 return "iSCSI";
1248 default:
1249 break;
1250 }
1251
1252 return "Unknown";
1253 }
1254
scsiback_get_fabric_proto_ident(struct se_portal_group * se_tpg)1255 static u8 scsiback_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1256 {
1257 struct scsiback_tpg *tpg = container_of(se_tpg,
1258 struct scsiback_tpg, se_tpg);
1259 struct scsiback_tport *tport = tpg->tport;
1260
1261 switch (tport->tport_proto_id) {
1262 case SCSI_PROTOCOL_SAS:
1263 return sas_get_fabric_proto_ident(se_tpg);
1264 case SCSI_PROTOCOL_FCP:
1265 return fc_get_fabric_proto_ident(se_tpg);
1266 case SCSI_PROTOCOL_ISCSI:
1267 return iscsi_get_fabric_proto_ident(se_tpg);
1268 default:
1269 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
1270 tport->tport_proto_id);
1271 break;
1272 }
1273
1274 return sas_get_fabric_proto_ident(se_tpg);
1275 }
1276
scsiback_get_fabric_wwn(struct se_portal_group * se_tpg)1277 static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg)
1278 {
1279 struct scsiback_tpg *tpg = container_of(se_tpg,
1280 struct scsiback_tpg, se_tpg);
1281 struct scsiback_tport *tport = tpg->tport;
1282
1283 return &tport->tport_name[0];
1284 }
1285
scsiback_get_tag(struct se_portal_group * se_tpg)1286 static u16 scsiback_get_tag(struct se_portal_group *se_tpg)
1287 {
1288 struct scsiback_tpg *tpg = container_of(se_tpg,
1289 struct scsiback_tpg, se_tpg);
1290 return tpg->tport_tpgt;
1291 }
1292
scsiback_get_default_depth(struct se_portal_group * se_tpg)1293 static u32 scsiback_get_default_depth(struct se_portal_group *se_tpg)
1294 {
1295 return 1;
1296 }
1297
1298 static u32
scsiback_get_pr_transport_id(struct se_portal_group * se_tpg,struct se_node_acl * se_nacl,struct t10_pr_registration * pr_reg,int * format_code,unsigned char * buf)1299 scsiback_get_pr_transport_id(struct se_portal_group *se_tpg,
1300 struct se_node_acl *se_nacl,
1301 struct t10_pr_registration *pr_reg,
1302 int *format_code,
1303 unsigned char *buf)
1304 {
1305 struct scsiback_tpg *tpg = container_of(se_tpg,
1306 struct scsiback_tpg, se_tpg);
1307 struct scsiback_tport *tport = tpg->tport;
1308
1309 switch (tport->tport_proto_id) {
1310 case SCSI_PROTOCOL_SAS:
1311 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1312 format_code, buf);
1313 case SCSI_PROTOCOL_FCP:
1314 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1315 format_code, buf);
1316 case SCSI_PROTOCOL_ISCSI:
1317 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1318 format_code, buf);
1319 default:
1320 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
1321 tport->tport_proto_id);
1322 break;
1323 }
1324
1325 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
1326 format_code, buf);
1327 }
1328
1329 static u32
scsiback_get_pr_transport_id_len(struct se_portal_group * se_tpg,struct se_node_acl * se_nacl,struct t10_pr_registration * pr_reg,int * format_code)1330 scsiback_get_pr_transport_id_len(struct se_portal_group *se_tpg,
1331 struct se_node_acl *se_nacl,
1332 struct t10_pr_registration *pr_reg,
1333 int *format_code)
1334 {
1335 struct scsiback_tpg *tpg = container_of(se_tpg,
1336 struct scsiback_tpg, se_tpg);
1337 struct scsiback_tport *tport = tpg->tport;
1338
1339 switch (tport->tport_proto_id) {
1340 case SCSI_PROTOCOL_SAS:
1341 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1342 format_code);
1343 case SCSI_PROTOCOL_FCP:
1344 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1345 format_code);
1346 case SCSI_PROTOCOL_ISCSI:
1347 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1348 format_code);
1349 default:
1350 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
1351 tport->tport_proto_id);
1352 break;
1353 }
1354
1355 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
1356 format_code);
1357 }
1358
1359 static char *
scsiback_parse_pr_out_transport_id(struct se_portal_group * se_tpg,const char * buf,u32 * out_tid_len,char ** port_nexus_ptr)1360 scsiback_parse_pr_out_transport_id(struct se_portal_group *se_tpg,
1361 const char *buf,
1362 u32 *out_tid_len,
1363 char **port_nexus_ptr)
1364 {
1365 struct scsiback_tpg *tpg = container_of(se_tpg,
1366 struct scsiback_tpg, se_tpg);
1367 struct scsiback_tport *tport = tpg->tport;
1368
1369 switch (tport->tport_proto_id) {
1370 case SCSI_PROTOCOL_SAS:
1371 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1372 port_nexus_ptr);
1373 case SCSI_PROTOCOL_FCP:
1374 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1375 port_nexus_ptr);
1376 case SCSI_PROTOCOL_ISCSI:
1377 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1378 port_nexus_ptr);
1379 default:
1380 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n",
1381 tport->tport_proto_id);
1382 break;
1383 }
1384
1385 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
1386 port_nexus_ptr);
1387 }
1388
1389 static struct se_wwn *
scsiback_make_tport(struct target_fabric_configfs * tf,struct config_group * group,const char * name)1390 scsiback_make_tport(struct target_fabric_configfs *tf,
1391 struct config_group *group,
1392 const char *name)
1393 {
1394 struct scsiback_tport *tport;
1395 char *ptr;
1396 u64 wwpn = 0;
1397 int off = 0;
1398
1399 tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL);
1400 if (!tport)
1401 return ERR_PTR(-ENOMEM);
1402
1403 tport->tport_wwpn = wwpn;
1404 /*
1405 * Determine the emulated Protocol Identifier and Target Port Name
1406 * based on the incoming configfs directory name.
1407 */
1408 ptr = strstr(name, "naa.");
1409 if (ptr) {
1410 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1411 goto check_len;
1412 }
1413 ptr = strstr(name, "fc.");
1414 if (ptr) {
1415 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1416 off = 3; /* Skip over "fc." */
1417 goto check_len;
1418 }
1419 ptr = strstr(name, "iqn.");
1420 if (ptr) {
1421 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1422 goto check_len;
1423 }
1424
1425 pr_err("Unable to locate prefix for emulated Target Port: %s\n", name);
1426 kfree(tport);
1427 return ERR_PTR(-EINVAL);
1428
1429 check_len:
1430 if (strlen(name) >= VSCSI_NAMELEN) {
1431 pr_err("Emulated %s Address: %s, exceeds max: %d\n", name,
1432 scsiback_dump_proto_id(tport), VSCSI_NAMELEN);
1433 kfree(tport);
1434 return ERR_PTR(-EINVAL);
1435 }
1436 snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]);
1437
1438 pr_debug("xen-pvscsi: Allocated emulated Target %s Address: %s\n",
1439 scsiback_dump_proto_id(tport), name);
1440
1441 return &tport->tport_wwn;
1442 }
1443
scsiback_drop_tport(struct se_wwn * wwn)1444 static void scsiback_drop_tport(struct se_wwn *wwn)
1445 {
1446 struct scsiback_tport *tport = container_of(wwn,
1447 struct scsiback_tport, tport_wwn);
1448
1449 pr_debug("xen-pvscsi: Deallocating emulated Target %s Address: %s\n",
1450 scsiback_dump_proto_id(tport), tport->tport_name);
1451
1452 kfree(tport);
1453 }
1454
1455 static struct se_node_acl *
scsiback_alloc_fabric_acl(struct se_portal_group * se_tpg)1456 scsiback_alloc_fabric_acl(struct se_portal_group *se_tpg)
1457 {
1458 return kzalloc(sizeof(struct se_node_acl), GFP_KERNEL);
1459 }
1460
1461 static void
scsiback_release_fabric_acl(struct se_portal_group * se_tpg,struct se_node_acl * se_nacl)1462 scsiback_release_fabric_acl(struct se_portal_group *se_tpg,
1463 struct se_node_acl *se_nacl)
1464 {
1465 kfree(se_nacl);
1466 }
1467
scsiback_tpg_get_inst_index(struct se_portal_group * se_tpg)1468 static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg)
1469 {
1470 return 1;
1471 }
1472
scsiback_check_stop_free(struct se_cmd * se_cmd)1473 static int scsiback_check_stop_free(struct se_cmd *se_cmd)
1474 {
1475 /*
1476 * Do not release struct se_cmd's containing a valid TMR
1477 * pointer. These will be released directly in scsiback_device_action()
1478 * with transport_generic_free_cmd().
1479 */
1480 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
1481 return 0;
1482
1483 transport_generic_free_cmd(se_cmd, 0);
1484 return 1;
1485 }
1486
scsiback_release_cmd(struct se_cmd * se_cmd)1487 static void scsiback_release_cmd(struct se_cmd *se_cmd)
1488 {
1489 struct vscsibk_pend *pending_req = container_of(se_cmd,
1490 struct vscsibk_pend, se_cmd);
1491
1492 kmem_cache_free(scsiback_cachep, pending_req);
1493 }
1494
scsiback_shutdown_session(struct se_session * se_sess)1495 static int scsiback_shutdown_session(struct se_session *se_sess)
1496 {
1497 return 0;
1498 }
1499
scsiback_close_session(struct se_session * se_sess)1500 static void scsiback_close_session(struct se_session *se_sess)
1501 {
1502 }
1503
scsiback_sess_get_index(struct se_session * se_sess)1504 static u32 scsiback_sess_get_index(struct se_session *se_sess)
1505 {
1506 return 0;
1507 }
1508
scsiback_write_pending(struct se_cmd * se_cmd)1509 static int scsiback_write_pending(struct se_cmd *se_cmd)
1510 {
1511 /* Go ahead and process the write immediately */
1512 target_execute_cmd(se_cmd);
1513
1514 return 0;
1515 }
1516
scsiback_write_pending_status(struct se_cmd * se_cmd)1517 static int scsiback_write_pending_status(struct se_cmd *se_cmd)
1518 {
1519 return 0;
1520 }
1521
scsiback_set_default_node_attrs(struct se_node_acl * nacl)1522 static void scsiback_set_default_node_attrs(struct se_node_acl *nacl)
1523 {
1524 }
1525
scsiback_get_task_tag(struct se_cmd * se_cmd)1526 static u32 scsiback_get_task_tag(struct se_cmd *se_cmd)
1527 {
1528 struct vscsibk_pend *pending_req = container_of(se_cmd,
1529 struct vscsibk_pend, se_cmd);
1530
1531 return pending_req->rqid;
1532 }
1533
scsiback_get_cmd_state(struct se_cmd * se_cmd)1534 static int scsiback_get_cmd_state(struct se_cmd *se_cmd)
1535 {
1536 return 0;
1537 }
1538
scsiback_queue_data_in(struct se_cmd * se_cmd)1539 static int scsiback_queue_data_in(struct se_cmd *se_cmd)
1540 {
1541 struct vscsibk_pend *pending_req = container_of(se_cmd,
1542 struct vscsibk_pend, se_cmd);
1543
1544 pending_req->result = SAM_STAT_GOOD;
1545 scsiback_cmd_done(pending_req);
1546 return 0;
1547 }
1548
scsiback_queue_status(struct se_cmd * se_cmd)1549 static int scsiback_queue_status(struct se_cmd *se_cmd)
1550 {
1551 struct vscsibk_pend *pending_req = container_of(se_cmd,
1552 struct vscsibk_pend, se_cmd);
1553
1554 if (se_cmd->sense_buffer &&
1555 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1556 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE)))
1557 pending_req->result = (DRIVER_SENSE << 24) |
1558 SAM_STAT_CHECK_CONDITION;
1559 else
1560 pending_req->result = se_cmd->scsi_status;
1561
1562 scsiback_cmd_done(pending_req);
1563 return 0;
1564 }
1565
scsiback_queue_tm_rsp(struct se_cmd * se_cmd)1566 static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd)
1567 {
1568 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
1569 struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr;
1570
1571 atomic_set(&tmr->tmr_complete, 1);
1572 wake_up(&tmr->tmr_wait);
1573 }
1574
scsiback_aborted_task(struct se_cmd * se_cmd)1575 static void scsiback_aborted_task(struct se_cmd *se_cmd)
1576 {
1577 }
1578
scsiback_tpg_param_show_alias(struct se_portal_group * se_tpg,char * page)1579 static ssize_t scsiback_tpg_param_show_alias(struct se_portal_group *se_tpg,
1580 char *page)
1581 {
1582 struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg,
1583 se_tpg);
1584 ssize_t rb;
1585
1586 mutex_lock(&tpg->tv_tpg_mutex);
1587 rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias);
1588 mutex_unlock(&tpg->tv_tpg_mutex);
1589
1590 return rb;
1591 }
1592
scsiback_tpg_param_store_alias(struct se_portal_group * se_tpg,const char * page,size_t count)1593 static ssize_t scsiback_tpg_param_store_alias(struct se_portal_group *se_tpg,
1594 const char *page, size_t count)
1595 {
1596 struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg,
1597 se_tpg);
1598 int len;
1599
1600 if (strlen(page) >= VSCSI_NAMELEN) {
1601 pr_err("param alias: %s, exceeds max: %d\n", page,
1602 VSCSI_NAMELEN);
1603 return -EINVAL;
1604 }
1605
1606 mutex_lock(&tpg->tv_tpg_mutex);
1607 len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page);
1608 if (tpg->param_alias[len - 1] == '\n')
1609 tpg->param_alias[len - 1] = '\0';
1610 mutex_unlock(&tpg->tv_tpg_mutex);
1611
1612 return count;
1613 }
1614
1615 TF_TPG_PARAM_ATTR(scsiback, alias, S_IRUGO | S_IWUSR);
1616
1617 static struct configfs_attribute *scsiback_param_attrs[] = {
1618 &scsiback_tpg_param_alias.attr,
1619 NULL,
1620 };
1621
scsiback_make_nexus(struct scsiback_tpg * tpg,const char * name)1622 static int scsiback_make_nexus(struct scsiback_tpg *tpg,
1623 const char *name)
1624 {
1625 struct se_portal_group *se_tpg;
1626 struct se_session *se_sess;
1627 struct scsiback_nexus *tv_nexus;
1628
1629 mutex_lock(&tpg->tv_tpg_mutex);
1630 if (tpg->tpg_nexus) {
1631 mutex_unlock(&tpg->tv_tpg_mutex);
1632 pr_debug("tpg->tpg_nexus already exists\n");
1633 return -EEXIST;
1634 }
1635 se_tpg = &tpg->se_tpg;
1636
1637 tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL);
1638 if (!tv_nexus) {
1639 mutex_unlock(&tpg->tv_tpg_mutex);
1640 return -ENOMEM;
1641 }
1642 /*
1643 * Initialize the struct se_session pointer
1644 */
1645 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1646 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1647 mutex_unlock(&tpg->tv_tpg_mutex);
1648 kfree(tv_nexus);
1649 return -ENOMEM;
1650 }
1651 se_sess = tv_nexus->tvn_se_sess;
1652 /*
1653 * Since we are running in 'demo mode' this call with generate a
1654 * struct se_node_acl for the scsiback struct se_portal_group with
1655 * the SCSI Initiator port name of the passed configfs group 'name'.
1656 */
1657 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1658 se_tpg, (unsigned char *)name);
1659 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1660 mutex_unlock(&tpg->tv_tpg_mutex);
1661 pr_debug("core_tpg_check_initiator_node_acl() failed for %s\n",
1662 name);
1663 goto out;
1664 }
1665 /*
1666 * Now register the TCM pvscsi virtual I_T Nexus as active with the
1667 * call to __transport_register_session()
1668 */
1669 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1670 tv_nexus->tvn_se_sess, tv_nexus);
1671 tpg->tpg_nexus = tv_nexus;
1672
1673 mutex_unlock(&tpg->tv_tpg_mutex);
1674 return 0;
1675
1676 out:
1677 transport_free_session(se_sess);
1678 kfree(tv_nexus);
1679 return -ENOMEM;
1680 }
1681
scsiback_drop_nexus(struct scsiback_tpg * tpg)1682 static int scsiback_drop_nexus(struct scsiback_tpg *tpg)
1683 {
1684 struct se_session *se_sess;
1685 struct scsiback_nexus *tv_nexus;
1686
1687 mutex_lock(&tpg->tv_tpg_mutex);
1688 tv_nexus = tpg->tpg_nexus;
1689 if (!tv_nexus) {
1690 mutex_unlock(&tpg->tv_tpg_mutex);
1691 return -ENODEV;
1692 }
1693
1694 se_sess = tv_nexus->tvn_se_sess;
1695 if (!se_sess) {
1696 mutex_unlock(&tpg->tv_tpg_mutex);
1697 return -ENODEV;
1698 }
1699
1700 if (tpg->tv_tpg_port_count != 0) {
1701 mutex_unlock(&tpg->tv_tpg_mutex);
1702 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n",
1703 tpg->tv_tpg_port_count);
1704 return -EBUSY;
1705 }
1706
1707 if (tpg->tv_tpg_fe_count != 0) {
1708 mutex_unlock(&tpg->tv_tpg_mutex);
1709 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n",
1710 tpg->tv_tpg_fe_count);
1711 return -EBUSY;
1712 }
1713
1714 pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
1715 scsiback_dump_proto_id(tpg->tport),
1716 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1717
1718 /*
1719 * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port
1720 */
1721 transport_deregister_session(tv_nexus->tvn_se_sess);
1722 tpg->tpg_nexus = NULL;
1723 mutex_unlock(&tpg->tv_tpg_mutex);
1724
1725 kfree(tv_nexus);
1726 return 0;
1727 }
1728
scsiback_tpg_show_nexus(struct se_portal_group * se_tpg,char * page)1729 static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg,
1730 char *page)
1731 {
1732 struct scsiback_tpg *tpg = container_of(se_tpg,
1733 struct scsiback_tpg, se_tpg);
1734 struct scsiback_nexus *tv_nexus;
1735 ssize_t ret;
1736
1737 mutex_lock(&tpg->tv_tpg_mutex);
1738 tv_nexus = tpg->tpg_nexus;
1739 if (!tv_nexus) {
1740 mutex_unlock(&tpg->tv_tpg_mutex);
1741 return -ENODEV;
1742 }
1743 ret = snprintf(page, PAGE_SIZE, "%s\n",
1744 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1745 mutex_unlock(&tpg->tv_tpg_mutex);
1746
1747 return ret;
1748 }
1749
scsiback_tpg_store_nexus(struct se_portal_group * se_tpg,const char * page,size_t count)1750 static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg,
1751 const char *page,
1752 size_t count)
1753 {
1754 struct scsiback_tpg *tpg = container_of(se_tpg,
1755 struct scsiback_tpg, se_tpg);
1756 struct scsiback_tport *tport_wwn = tpg->tport;
1757 unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr;
1758 int ret;
1759 /*
1760 * Shutdown the active I_T nexus if 'NULL' is passed..
1761 */
1762 if (!strncmp(page, "NULL", 4)) {
1763 ret = scsiback_drop_nexus(tpg);
1764 return (!ret) ? count : ret;
1765 }
1766 /*
1767 * Otherwise make sure the passed virtual Initiator port WWN matches
1768 * the fabric protocol_id set in scsiback_make_tport(), and call
1769 * scsiback_make_nexus().
1770 */
1771 if (strlen(page) >= VSCSI_NAMELEN) {
1772 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
1773 page, VSCSI_NAMELEN);
1774 return -EINVAL;
1775 }
1776 snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page);
1777
1778 ptr = strstr(i_port, "naa.");
1779 if (ptr) {
1780 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1781 pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
1782 i_port, scsiback_dump_proto_id(tport_wwn));
1783 return -EINVAL;
1784 }
1785 port_ptr = &i_port[0];
1786 goto check_newline;
1787 }
1788 ptr = strstr(i_port, "fc.");
1789 if (ptr) {
1790 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1791 pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
1792 i_port, scsiback_dump_proto_id(tport_wwn));
1793 return -EINVAL;
1794 }
1795 port_ptr = &i_port[3]; /* Skip over "fc." */
1796 goto check_newline;
1797 }
1798 ptr = strstr(i_port, "iqn.");
1799 if (ptr) {
1800 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1801 pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
1802 i_port, scsiback_dump_proto_id(tport_wwn));
1803 return -EINVAL;
1804 }
1805 port_ptr = &i_port[0];
1806 goto check_newline;
1807 }
1808 pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
1809 i_port);
1810 return -EINVAL;
1811 /*
1812 * Clear any trailing newline for the NAA WWN
1813 */
1814 check_newline:
1815 if (i_port[strlen(i_port) - 1] == '\n')
1816 i_port[strlen(i_port) - 1] = '\0';
1817
1818 ret = scsiback_make_nexus(tpg, port_ptr);
1819 if (ret < 0)
1820 return ret;
1821
1822 return count;
1823 }
1824
1825 TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR);
1826
1827 static struct configfs_attribute *scsiback_tpg_attrs[] = {
1828 &scsiback_tpg_nexus.attr,
1829 NULL,
1830 };
1831
1832 static ssize_t
scsiback_wwn_show_attr_version(struct target_fabric_configfs * tf,char * page)1833 scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf,
1834 char *page)
1835 {
1836 return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on "
1837 UTS_RELEASE"\n",
1838 VSCSI_VERSION, utsname()->sysname, utsname()->machine);
1839 }
1840
1841 TF_WWN_ATTR_RO(scsiback, version);
1842
1843 static struct configfs_attribute *scsiback_wwn_attrs[] = {
1844 &scsiback_wwn_version.attr,
1845 NULL,
1846 };
1847
scsiback_get_fabric_name(void)1848 static char *scsiback_get_fabric_name(void)
1849 {
1850 return "xen-pvscsi";
1851 }
1852
scsiback_port_link(struct se_portal_group * se_tpg,struct se_lun * lun)1853 static int scsiback_port_link(struct se_portal_group *se_tpg,
1854 struct se_lun *lun)
1855 {
1856 struct scsiback_tpg *tpg = container_of(se_tpg,
1857 struct scsiback_tpg, se_tpg);
1858
1859 mutex_lock(&tpg->tv_tpg_mutex);
1860 tpg->tv_tpg_port_count++;
1861 mutex_unlock(&tpg->tv_tpg_mutex);
1862
1863 return 0;
1864 }
1865
scsiback_port_unlink(struct se_portal_group * se_tpg,struct se_lun * lun)1866 static void scsiback_port_unlink(struct se_portal_group *se_tpg,
1867 struct se_lun *lun)
1868 {
1869 struct scsiback_tpg *tpg = container_of(se_tpg,
1870 struct scsiback_tpg, se_tpg);
1871
1872 mutex_lock(&tpg->tv_tpg_mutex);
1873 tpg->tv_tpg_port_count--;
1874 mutex_unlock(&tpg->tv_tpg_mutex);
1875 }
1876
1877 static struct se_portal_group *
scsiback_make_tpg(struct se_wwn * wwn,struct config_group * group,const char * name)1878 scsiback_make_tpg(struct se_wwn *wwn,
1879 struct config_group *group,
1880 const char *name)
1881 {
1882 struct scsiback_tport *tport = container_of(wwn,
1883 struct scsiback_tport, tport_wwn);
1884
1885 struct scsiback_tpg *tpg;
1886 u16 tpgt;
1887 int ret;
1888
1889 if (strstr(name, "tpgt_") != name)
1890 return ERR_PTR(-EINVAL);
1891 ret = kstrtou16(name + 5, 10, &tpgt);
1892 if (ret)
1893 return ERR_PTR(ret);
1894
1895 tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL);
1896 if (!tpg)
1897 return ERR_PTR(-ENOMEM);
1898
1899 mutex_init(&tpg->tv_tpg_mutex);
1900 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1901 INIT_LIST_HEAD(&tpg->info_list);
1902 tpg->tport = tport;
1903 tpg->tport_tpgt = tpgt;
1904
1905 ret = core_tpg_register(&scsiback_fabric_configfs->tf_ops, wwn,
1906 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1907 if (ret < 0) {
1908 kfree(tpg);
1909 return NULL;
1910 }
1911 mutex_lock(&scsiback_mutex);
1912 list_add_tail(&tpg->tv_tpg_list, &scsiback_list);
1913 mutex_unlock(&scsiback_mutex);
1914
1915 return &tpg->se_tpg;
1916 }
1917
scsiback_drop_tpg(struct se_portal_group * se_tpg)1918 static void scsiback_drop_tpg(struct se_portal_group *se_tpg)
1919 {
1920 struct scsiback_tpg *tpg = container_of(se_tpg,
1921 struct scsiback_tpg, se_tpg);
1922
1923 mutex_lock(&scsiback_mutex);
1924 list_del(&tpg->tv_tpg_list);
1925 mutex_unlock(&scsiback_mutex);
1926 /*
1927 * Release the virtual I_T Nexus for this xen-pvscsi TPG
1928 */
1929 scsiback_drop_nexus(tpg);
1930 /*
1931 * Deregister the se_tpg from TCM..
1932 */
1933 core_tpg_deregister(se_tpg);
1934 kfree(tpg);
1935 }
1936
scsiback_check_true(struct se_portal_group * se_tpg)1937 static int scsiback_check_true(struct se_portal_group *se_tpg)
1938 {
1939 return 1;
1940 }
1941
scsiback_check_false(struct se_portal_group * se_tpg)1942 static int scsiback_check_false(struct se_portal_group *se_tpg)
1943 {
1944 return 0;
1945 }
1946
1947 static struct target_core_fabric_ops scsiback_ops = {
1948 .get_fabric_name = scsiback_get_fabric_name,
1949 .get_fabric_proto_ident = scsiback_get_fabric_proto_ident,
1950 .tpg_get_wwn = scsiback_get_fabric_wwn,
1951 .tpg_get_tag = scsiback_get_tag,
1952 .tpg_get_default_depth = scsiback_get_default_depth,
1953 .tpg_get_pr_transport_id = scsiback_get_pr_transport_id,
1954 .tpg_get_pr_transport_id_len = scsiback_get_pr_transport_id_len,
1955 .tpg_parse_pr_out_transport_id = scsiback_parse_pr_out_transport_id,
1956 .tpg_check_demo_mode = scsiback_check_true,
1957 .tpg_check_demo_mode_cache = scsiback_check_true,
1958 .tpg_check_demo_mode_write_protect = scsiback_check_false,
1959 .tpg_check_prod_mode_write_protect = scsiback_check_false,
1960 .tpg_alloc_fabric_acl = scsiback_alloc_fabric_acl,
1961 .tpg_release_fabric_acl = scsiback_release_fabric_acl,
1962 .tpg_get_inst_index = scsiback_tpg_get_inst_index,
1963 .check_stop_free = scsiback_check_stop_free,
1964 .release_cmd = scsiback_release_cmd,
1965 .put_session = NULL,
1966 .shutdown_session = scsiback_shutdown_session,
1967 .close_session = scsiback_close_session,
1968 .sess_get_index = scsiback_sess_get_index,
1969 .sess_get_initiator_sid = NULL,
1970 .write_pending = scsiback_write_pending,
1971 .write_pending_status = scsiback_write_pending_status,
1972 .set_default_node_attributes = scsiback_set_default_node_attrs,
1973 .get_task_tag = scsiback_get_task_tag,
1974 .get_cmd_state = scsiback_get_cmd_state,
1975 .queue_data_in = scsiback_queue_data_in,
1976 .queue_status = scsiback_queue_status,
1977 .queue_tm_rsp = scsiback_queue_tm_rsp,
1978 .aborted_task = scsiback_aborted_task,
1979 /*
1980 * Setup callers for generic logic in target_core_fabric_configfs.c
1981 */
1982 .fabric_make_wwn = scsiback_make_tport,
1983 .fabric_drop_wwn = scsiback_drop_tport,
1984 .fabric_make_tpg = scsiback_make_tpg,
1985 .fabric_drop_tpg = scsiback_drop_tpg,
1986 .fabric_post_link = scsiback_port_link,
1987 .fabric_pre_unlink = scsiback_port_unlink,
1988 .fabric_make_np = NULL,
1989 .fabric_drop_np = NULL,
1990 #if 0
1991 .fabric_make_nodeacl = scsiback_make_nodeacl,
1992 .fabric_drop_nodeacl = scsiback_drop_nodeacl,
1993 #endif
1994 };
1995
scsiback_register_configfs(void)1996 static int scsiback_register_configfs(void)
1997 {
1998 struct target_fabric_configfs *fabric;
1999 int ret;
2000
2001 pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
2002 VSCSI_VERSION, utsname()->sysname, utsname()->machine);
2003 /*
2004 * Register the top level struct config_item_type with TCM core
2005 */
2006 fabric = target_fabric_configfs_init(THIS_MODULE, "xen-pvscsi");
2007 if (IS_ERR(fabric))
2008 return PTR_ERR(fabric);
2009
2010 /*
2011 * Setup fabric->tf_ops from our local scsiback_ops
2012 */
2013 fabric->tf_ops = scsiback_ops;
2014 /*
2015 * Setup default attribute lists for various fabric->tf_cit_tmpl
2016 */
2017 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = scsiback_wwn_attrs;
2018 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = scsiback_tpg_attrs;
2019 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
2020 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = scsiback_param_attrs;
2021 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
2022 fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
2023 fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
2024 fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
2025 fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
2026 /*
2027 * Register the fabric for use within TCM
2028 */
2029 ret = target_fabric_configfs_register(fabric);
2030 if (ret < 0) {
2031 target_fabric_configfs_free(fabric);
2032 return ret;
2033 }
2034 /*
2035 * Setup our local pointer to *fabric
2036 */
2037 scsiback_fabric_configfs = fabric;
2038 pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n");
2039 return 0;
2040 };
2041
scsiback_deregister_configfs(void)2042 static void scsiback_deregister_configfs(void)
2043 {
2044 if (!scsiback_fabric_configfs)
2045 return;
2046
2047 target_fabric_configfs_deregister(scsiback_fabric_configfs);
2048 scsiback_fabric_configfs = NULL;
2049 pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n");
2050 };
2051
2052 static const struct xenbus_device_id scsiback_ids[] = {
2053 { "vscsi" },
2054 { "" }
2055 };
2056
2057 static struct xenbus_driver scsiback_driver = {
2058 .ids = scsiback_ids,
2059 .probe = scsiback_probe,
2060 .remove = scsiback_remove,
2061 .otherend_changed = scsiback_frontend_changed
2062 };
2063
scsiback_init_pend(void * p)2064 static void scsiback_init_pend(void *p)
2065 {
2066 struct vscsibk_pend *pend = p;
2067 int i;
2068
2069 memset(pend, 0, sizeof(*pend));
2070 for (i = 0; i < VSCSI_MAX_GRANTS; i++)
2071 pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
2072 }
2073
scsiback_init(void)2074 static int __init scsiback_init(void)
2075 {
2076 int ret;
2077
2078 if (!xen_domain())
2079 return -ENODEV;
2080
2081 scsiback_cachep = kmem_cache_create("vscsiif_cache",
2082 sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend);
2083 if (!scsiback_cachep)
2084 return -ENOMEM;
2085
2086 ret = xenbus_register_backend(&scsiback_driver);
2087 if (ret)
2088 goto out_cache_destroy;
2089
2090 ret = scsiback_register_configfs();
2091 if (ret)
2092 goto out_unregister_xenbus;
2093
2094 return 0;
2095
2096 out_unregister_xenbus:
2097 xenbus_unregister_driver(&scsiback_driver);
2098 out_cache_destroy:
2099 kmem_cache_destroy(scsiback_cachep);
2100 pr_err("xen-pvscsi: %s: error %d\n", __func__, ret);
2101 return ret;
2102 }
2103
scsiback_exit(void)2104 static void __exit scsiback_exit(void)
2105 {
2106 struct page *page;
2107
2108 while (free_pages_num) {
2109 if (get_free_page(&page))
2110 BUG();
2111 free_xenballooned_pages(1, &page);
2112 }
2113 scsiback_deregister_configfs();
2114 xenbus_unregister_driver(&scsiback_driver);
2115 kmem_cache_destroy(scsiback_cachep);
2116 }
2117
2118 module_init(scsiback_init);
2119 module_exit(scsiback_exit);
2120
2121 MODULE_DESCRIPTION("Xen SCSI backend driver");
2122 MODULE_LICENSE("Dual BSD/GPL");
2123 MODULE_ALIAS("xen-backend:vscsi");
2124 MODULE_AUTHOR("Juergen Gross <jgross@suse.com>");
2125