1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NVMe admin command implementation.
4 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
5 */
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 #include <linux/module.h>
8 #include <linux/rculist.h>
9 #include <linux/part_stat.h>
10
11 #include <generated/utsrelease.h>
12 #include <asm/unaligned.h>
13 #include "nvmet.h"
14
nvmet_get_log_page_len(struct nvme_command * cmd)15 u32 nvmet_get_log_page_len(struct nvme_command *cmd)
16 {
17 u32 len = le16_to_cpu(cmd->get_log_page.numdu);
18
19 len <<= 16;
20 len += le16_to_cpu(cmd->get_log_page.numdl);
21 /* NUMD is a 0's based value */
22 len += 1;
23 len *= sizeof(u32);
24
25 return len;
26 }
27
nvmet_feat_data_len(struct nvmet_req * req,u32 cdw10)28 static u32 nvmet_feat_data_len(struct nvmet_req *req, u32 cdw10)
29 {
30 switch (cdw10 & 0xff) {
31 case NVME_FEAT_HOST_ID:
32 return sizeof(req->sq->ctrl->hostid);
33 default:
34 return 0;
35 }
36 }
37
nvmet_get_log_page_offset(struct nvme_command * cmd)38 u64 nvmet_get_log_page_offset(struct nvme_command *cmd)
39 {
40 return le64_to_cpu(cmd->get_log_page.lpo);
41 }
42
nvmet_execute_get_log_page_noop(struct nvmet_req * req)43 static void nvmet_execute_get_log_page_noop(struct nvmet_req *req)
44 {
45 nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->transfer_len));
46 }
47
nvmet_execute_get_log_page_error(struct nvmet_req * req)48 static void nvmet_execute_get_log_page_error(struct nvmet_req *req)
49 {
50 struct nvmet_ctrl *ctrl = req->sq->ctrl;
51 unsigned long flags;
52 off_t offset = 0;
53 u64 slot;
54 u64 i;
55
56 spin_lock_irqsave(&ctrl->error_lock, flags);
57 slot = ctrl->err_counter % NVMET_ERROR_LOG_SLOTS;
58
59 for (i = 0; i < NVMET_ERROR_LOG_SLOTS; i++) {
60 if (nvmet_copy_to_sgl(req, offset, &ctrl->slots[slot],
61 sizeof(struct nvme_error_slot)))
62 break;
63
64 if (slot == 0)
65 slot = NVMET_ERROR_LOG_SLOTS - 1;
66 else
67 slot--;
68 offset += sizeof(struct nvme_error_slot);
69 }
70 spin_unlock_irqrestore(&ctrl->error_lock, flags);
71 nvmet_req_complete(req, 0);
72 }
73
nvmet_get_smart_log_nsid(struct nvmet_req * req,struct nvme_smart_log * slog)74 static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req,
75 struct nvme_smart_log *slog)
76 {
77 u64 host_reads, host_writes, data_units_read, data_units_written;
78 u16 status;
79
80 status = nvmet_req_find_ns(req);
81 if (status)
82 return status;
83
84 /* we don't have the right data for file backed ns */
85 if (!req->ns->bdev)
86 return NVME_SC_SUCCESS;
87
88 host_reads = part_stat_read(req->ns->bdev, ios[READ]);
89 data_units_read =
90 DIV_ROUND_UP(part_stat_read(req->ns->bdev, sectors[READ]), 1000);
91 host_writes = part_stat_read(req->ns->bdev, ios[WRITE]);
92 data_units_written =
93 DIV_ROUND_UP(part_stat_read(req->ns->bdev, sectors[WRITE]), 1000);
94
95 put_unaligned_le64(host_reads, &slog->host_reads[0]);
96 put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
97 put_unaligned_le64(host_writes, &slog->host_writes[0]);
98 put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
99
100 return NVME_SC_SUCCESS;
101 }
102
nvmet_get_smart_log_all(struct nvmet_req * req,struct nvme_smart_log * slog)103 static u16 nvmet_get_smart_log_all(struct nvmet_req *req,
104 struct nvme_smart_log *slog)
105 {
106 u64 host_reads = 0, host_writes = 0;
107 u64 data_units_read = 0, data_units_written = 0;
108 struct nvmet_ns *ns;
109 struct nvmet_ctrl *ctrl;
110 unsigned long idx;
111
112 ctrl = req->sq->ctrl;
113 xa_for_each(&ctrl->subsys->namespaces, idx, ns) {
114 /* we don't have the right data for file backed ns */
115 if (!ns->bdev)
116 continue;
117 host_reads += part_stat_read(ns->bdev, ios[READ]);
118 data_units_read += DIV_ROUND_UP(
119 part_stat_read(ns->bdev, sectors[READ]), 1000);
120 host_writes += part_stat_read(ns->bdev, ios[WRITE]);
121 data_units_written += DIV_ROUND_UP(
122 part_stat_read(ns->bdev, sectors[WRITE]), 1000);
123 }
124
125 put_unaligned_le64(host_reads, &slog->host_reads[0]);
126 put_unaligned_le64(data_units_read, &slog->data_units_read[0]);
127 put_unaligned_le64(host_writes, &slog->host_writes[0]);
128 put_unaligned_le64(data_units_written, &slog->data_units_written[0]);
129
130 return NVME_SC_SUCCESS;
131 }
132
nvmet_execute_get_log_page_smart(struct nvmet_req * req)133 static void nvmet_execute_get_log_page_smart(struct nvmet_req *req)
134 {
135 struct nvme_smart_log *log;
136 u16 status = NVME_SC_INTERNAL;
137 unsigned long flags;
138
139 if (req->transfer_len != sizeof(*log))
140 goto out;
141
142 log = kzalloc(sizeof(*log), GFP_KERNEL);
143 if (!log)
144 goto out;
145
146 if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL))
147 status = nvmet_get_smart_log_all(req, log);
148 else
149 status = nvmet_get_smart_log_nsid(req, log);
150 if (status)
151 goto out_free_log;
152
153 spin_lock_irqsave(&req->sq->ctrl->error_lock, flags);
154 put_unaligned_le64(req->sq->ctrl->err_counter,
155 &log->num_err_log_entries);
156 spin_unlock_irqrestore(&req->sq->ctrl->error_lock, flags);
157
158 status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
159 out_free_log:
160 kfree(log);
161 out:
162 nvmet_req_complete(req, status);
163 }
164
nvmet_get_cmd_effects_nvm(struct nvme_effects_log * log)165 static void nvmet_get_cmd_effects_nvm(struct nvme_effects_log *log)
166 {
167 log->acs[nvme_admin_get_log_page] =
168 log->acs[nvme_admin_identify] =
169 log->acs[nvme_admin_abort_cmd] =
170 log->acs[nvme_admin_set_features] =
171 log->acs[nvme_admin_get_features] =
172 log->acs[nvme_admin_async_event] =
173 log->acs[nvme_admin_keep_alive] =
174 cpu_to_le32(NVME_CMD_EFFECTS_CSUPP);
175
176 log->iocs[nvme_cmd_read] =
177 log->iocs[nvme_cmd_flush] =
178 log->iocs[nvme_cmd_dsm] =
179 cpu_to_le32(NVME_CMD_EFFECTS_CSUPP);
180 log->iocs[nvme_cmd_write] =
181 log->iocs[nvme_cmd_write_zeroes] =
182 cpu_to_le32(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC);
183 }
184
nvmet_get_cmd_effects_zns(struct nvme_effects_log * log)185 static void nvmet_get_cmd_effects_zns(struct nvme_effects_log *log)
186 {
187 log->iocs[nvme_cmd_zone_append] =
188 log->iocs[nvme_cmd_zone_mgmt_send] =
189 cpu_to_le32(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC);
190 log->iocs[nvme_cmd_zone_mgmt_recv] =
191 cpu_to_le32(NVME_CMD_EFFECTS_CSUPP);
192 }
193
nvmet_execute_get_log_cmd_effects_ns(struct nvmet_req * req)194 static void nvmet_execute_get_log_cmd_effects_ns(struct nvmet_req *req)
195 {
196 struct nvme_effects_log *log;
197 u16 status = NVME_SC_SUCCESS;
198
199 log = kzalloc(sizeof(*log), GFP_KERNEL);
200 if (!log) {
201 status = NVME_SC_INTERNAL;
202 goto out;
203 }
204
205 switch (req->cmd->get_log_page.csi) {
206 case NVME_CSI_NVM:
207 nvmet_get_cmd_effects_nvm(log);
208 break;
209 case NVME_CSI_ZNS:
210 if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED)) {
211 status = NVME_SC_INVALID_IO_CMD_SET;
212 goto free;
213 }
214 nvmet_get_cmd_effects_nvm(log);
215 nvmet_get_cmd_effects_zns(log);
216 break;
217 default:
218 status = NVME_SC_INVALID_LOG_PAGE;
219 goto free;
220 }
221
222 status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log));
223 free:
224 kfree(log);
225 out:
226 nvmet_req_complete(req, status);
227 }
228
nvmet_execute_get_log_changed_ns(struct nvmet_req * req)229 static void nvmet_execute_get_log_changed_ns(struct nvmet_req *req)
230 {
231 struct nvmet_ctrl *ctrl = req->sq->ctrl;
232 u16 status = NVME_SC_INTERNAL;
233 size_t len;
234
235 if (req->transfer_len != NVME_MAX_CHANGED_NAMESPACES * sizeof(__le32))
236 goto out;
237
238 mutex_lock(&ctrl->lock);
239 if (ctrl->nr_changed_ns == U32_MAX)
240 len = sizeof(__le32);
241 else
242 len = ctrl->nr_changed_ns * sizeof(__le32);
243 status = nvmet_copy_to_sgl(req, 0, ctrl->changed_ns_list, len);
244 if (!status)
245 status = nvmet_zero_sgl(req, len, req->transfer_len - len);
246 ctrl->nr_changed_ns = 0;
247 nvmet_clear_aen_bit(req, NVME_AEN_BIT_NS_ATTR);
248 mutex_unlock(&ctrl->lock);
249 out:
250 nvmet_req_complete(req, status);
251 }
252
nvmet_format_ana_group(struct nvmet_req * req,u32 grpid,struct nvme_ana_group_desc * desc)253 static u32 nvmet_format_ana_group(struct nvmet_req *req, u32 grpid,
254 struct nvme_ana_group_desc *desc)
255 {
256 struct nvmet_ctrl *ctrl = req->sq->ctrl;
257 struct nvmet_ns *ns;
258 unsigned long idx;
259 u32 count = 0;
260
261 if (!(req->cmd->get_log_page.lsp & NVME_ANA_LOG_RGO)) {
262 xa_for_each(&ctrl->subsys->namespaces, idx, ns)
263 if (ns->anagrpid == grpid)
264 desc->nsids[count++] = cpu_to_le32(ns->nsid);
265 }
266
267 desc->grpid = cpu_to_le32(grpid);
268 desc->nnsids = cpu_to_le32(count);
269 desc->chgcnt = cpu_to_le64(nvmet_ana_chgcnt);
270 desc->state = req->port->ana_state[grpid];
271 memset(desc->rsvd17, 0, sizeof(desc->rsvd17));
272 return struct_size(desc, nsids, count);
273 }
274
nvmet_execute_get_log_page_ana(struct nvmet_req * req)275 static void nvmet_execute_get_log_page_ana(struct nvmet_req *req)
276 {
277 struct nvme_ana_rsp_hdr hdr = { 0, };
278 struct nvme_ana_group_desc *desc;
279 size_t offset = sizeof(struct nvme_ana_rsp_hdr); /* start beyond hdr */
280 size_t len;
281 u32 grpid;
282 u16 ngrps = 0;
283 u16 status;
284
285 status = NVME_SC_INTERNAL;
286 desc = kmalloc(struct_size(desc, nsids, NVMET_MAX_NAMESPACES),
287 GFP_KERNEL);
288 if (!desc)
289 goto out;
290
291 down_read(&nvmet_ana_sem);
292 for (grpid = 1; grpid <= NVMET_MAX_ANAGRPS; grpid++) {
293 if (!nvmet_ana_group_enabled[grpid])
294 continue;
295 len = nvmet_format_ana_group(req, grpid, desc);
296 status = nvmet_copy_to_sgl(req, offset, desc, len);
297 if (status)
298 break;
299 offset += len;
300 ngrps++;
301 }
302 for ( ; grpid <= NVMET_MAX_ANAGRPS; grpid++) {
303 if (nvmet_ana_group_enabled[grpid])
304 ngrps++;
305 }
306
307 hdr.chgcnt = cpu_to_le64(nvmet_ana_chgcnt);
308 hdr.ngrps = cpu_to_le16(ngrps);
309 nvmet_clear_aen_bit(req, NVME_AEN_BIT_ANA_CHANGE);
310 up_read(&nvmet_ana_sem);
311
312 kfree(desc);
313
314 /* copy the header last once we know the number of groups */
315 status = nvmet_copy_to_sgl(req, 0, &hdr, sizeof(hdr));
316 out:
317 nvmet_req_complete(req, status);
318 }
319
nvmet_execute_get_log_page(struct nvmet_req * req)320 static void nvmet_execute_get_log_page(struct nvmet_req *req)
321 {
322 if (!nvmet_check_transfer_len(req, nvmet_get_log_page_len(req->cmd)))
323 return;
324
325 switch (req->cmd->get_log_page.lid) {
326 case NVME_LOG_ERROR:
327 return nvmet_execute_get_log_page_error(req);
328 case NVME_LOG_SMART:
329 return nvmet_execute_get_log_page_smart(req);
330 case NVME_LOG_FW_SLOT:
331 /*
332 * We only support a single firmware slot which always is
333 * active, so we can zero out the whole firmware slot log and
334 * still claim to fully implement this mandatory log page.
335 */
336 return nvmet_execute_get_log_page_noop(req);
337 case NVME_LOG_CHANGED_NS:
338 return nvmet_execute_get_log_changed_ns(req);
339 case NVME_LOG_CMD_EFFECTS:
340 return nvmet_execute_get_log_cmd_effects_ns(req);
341 case NVME_LOG_ANA:
342 return nvmet_execute_get_log_page_ana(req);
343 }
344 pr_debug("unhandled lid %d on qid %d\n",
345 req->cmd->get_log_page.lid, req->sq->qid);
346 req->error_loc = offsetof(struct nvme_get_log_page_command, lid);
347 nvmet_req_complete(req, NVME_SC_INVALID_FIELD | NVME_SC_DNR);
348 }
349
nvmet_execute_identify_ctrl(struct nvmet_req * req)350 static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
351 {
352 struct nvmet_ctrl *ctrl = req->sq->ctrl;
353 struct nvmet_subsys *subsys = ctrl->subsys;
354 struct nvme_id_ctrl *id;
355 u32 cmd_capsule_size;
356 u16 status = 0;
357
358 if (!subsys->subsys_discovered) {
359 mutex_lock(&subsys->lock);
360 subsys->subsys_discovered = true;
361 mutex_unlock(&subsys->lock);
362 }
363
364 id = kzalloc(sizeof(*id), GFP_KERNEL);
365 if (!id) {
366 status = NVME_SC_INTERNAL;
367 goto out;
368 }
369
370 /* XXX: figure out how to assign real vendors IDs. */
371 id->vid = 0;
372 id->ssvid = 0;
373
374 memcpy(id->sn, ctrl->subsys->serial, NVMET_SN_MAX_SIZE);
375 memcpy_and_pad(id->mn, sizeof(id->mn), subsys->model_number,
376 strlen(subsys->model_number), ' ');
377 memcpy_and_pad(id->fr, sizeof(id->fr),
378 subsys->firmware_rev, strlen(subsys->firmware_rev), ' ');
379
380 put_unaligned_le24(subsys->ieee_oui, id->ieee);
381
382 id->rab = 6;
383
384 if (nvmet_is_disc_subsys(ctrl->subsys))
385 id->cntrltype = NVME_CTRL_DISC;
386 else
387 id->cntrltype = NVME_CTRL_IO;
388
389 /* we support multiple ports, multiples hosts and ANA: */
390 id->cmic = NVME_CTRL_CMIC_MULTI_PORT | NVME_CTRL_CMIC_MULTI_CTRL |
391 NVME_CTRL_CMIC_ANA;
392
393 /* Limit MDTS according to transport capability */
394 if (ctrl->ops->get_mdts)
395 id->mdts = ctrl->ops->get_mdts(ctrl);
396 else
397 id->mdts = 0;
398
399 id->cntlid = cpu_to_le16(ctrl->cntlid);
400 id->ver = cpu_to_le32(ctrl->subsys->ver);
401
402 /* XXX: figure out what to do about RTD3R/RTD3 */
403 id->oaes = cpu_to_le32(NVMET_AEN_CFG_OPTIONAL);
404 id->ctratt = cpu_to_le32(NVME_CTRL_ATTR_HID_128_BIT |
405 NVME_CTRL_ATTR_TBKAS);
406
407 id->oacs = 0;
408
409 /*
410 * We don't really have a practical limit on the number of abort
411 * comands. But we don't do anything useful for abort either, so
412 * no point in allowing more abort commands than the spec requires.
413 */
414 id->acl = 3;
415
416 id->aerl = NVMET_ASYNC_EVENTS - 1;
417
418 /* first slot is read-only, only one slot supported */
419 id->frmw = (1 << 0) | (1 << 1);
420 id->lpa = (1 << 0) | (1 << 1) | (1 << 2);
421 id->elpe = NVMET_ERROR_LOG_SLOTS - 1;
422 id->npss = 0;
423
424 /* We support keep-alive timeout in granularity of seconds */
425 id->kas = cpu_to_le16(NVMET_KAS);
426
427 id->sqes = (0x6 << 4) | 0x6;
428 id->cqes = (0x4 << 4) | 0x4;
429
430 /* no enforcement soft-limit for maxcmd - pick arbitrary high value */
431 id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
432
433 id->nn = cpu_to_le32(NVMET_MAX_NAMESPACES);
434 id->mnan = cpu_to_le32(NVMET_MAX_NAMESPACES);
435 id->oncs = cpu_to_le16(NVME_CTRL_ONCS_DSM |
436 NVME_CTRL_ONCS_WRITE_ZEROES);
437
438 /* XXX: don't report vwc if the underlying device is write through */
439 id->vwc = NVME_CTRL_VWC_PRESENT;
440
441 /*
442 * We can't support atomic writes bigger than a LBA without support
443 * from the backend device.
444 */
445 id->awun = 0;
446 id->awupf = 0;
447
448 id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
449 if (ctrl->ops->flags & NVMF_KEYED_SGLS)
450 id->sgls |= cpu_to_le32(1 << 2);
451 if (req->port->inline_data_size)
452 id->sgls |= cpu_to_le32(1 << 20);
453
454 strscpy(id->subnqn, ctrl->subsys->subsysnqn, sizeof(id->subnqn));
455
456 /*
457 * Max command capsule size is sqe + in-capsule data size.
458 * Disable in-capsule data for Metadata capable controllers.
459 */
460 cmd_capsule_size = sizeof(struct nvme_command);
461 if (!ctrl->pi_support)
462 cmd_capsule_size += req->port->inline_data_size;
463 id->ioccsz = cpu_to_le32(cmd_capsule_size / 16);
464
465 /* Max response capsule size is cqe */
466 id->iorcsz = cpu_to_le32(sizeof(struct nvme_completion) / 16);
467
468 id->msdbd = ctrl->ops->msdbd;
469
470 id->anacap = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4);
471 id->anatt = 10; /* random value */
472 id->anagrpmax = cpu_to_le32(NVMET_MAX_ANAGRPS);
473 id->nanagrpid = cpu_to_le32(NVMET_MAX_ANAGRPS);
474
475 /*
476 * Meh, we don't really support any power state. Fake up the same
477 * values that qemu does.
478 */
479 id->psd[0].max_power = cpu_to_le16(0x9c4);
480 id->psd[0].entry_lat = cpu_to_le32(0x10);
481 id->psd[0].exit_lat = cpu_to_le32(0x4);
482
483 id->nwpc = 1 << 0; /* write protect and no write protect */
484
485 status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
486
487 kfree(id);
488 out:
489 nvmet_req_complete(req, status);
490 }
491
nvmet_execute_identify_ns(struct nvmet_req * req)492 static void nvmet_execute_identify_ns(struct nvmet_req *req)
493 {
494 struct nvme_id_ns *id;
495 u16 status;
496
497 if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
498 req->error_loc = offsetof(struct nvme_identify, nsid);
499 status = NVME_SC_INVALID_NS | NVME_SC_DNR;
500 goto out;
501 }
502
503 id = kzalloc(sizeof(*id), GFP_KERNEL);
504 if (!id) {
505 status = NVME_SC_INTERNAL;
506 goto out;
507 }
508
509 /* return an all zeroed buffer if we can't find an active namespace */
510 status = nvmet_req_find_ns(req);
511 if (status) {
512 status = 0;
513 goto done;
514 }
515
516 if (nvmet_ns_revalidate(req->ns)) {
517 mutex_lock(&req->ns->subsys->lock);
518 nvmet_ns_changed(req->ns->subsys, req->ns->nsid);
519 mutex_unlock(&req->ns->subsys->lock);
520 }
521
522 /*
523 * nuse = ncap = nsze isn't always true, but we have no way to find
524 * that out from the underlying device.
525 */
526 id->ncap = id->nsze =
527 cpu_to_le64(req->ns->size >> req->ns->blksize_shift);
528 switch (req->port->ana_state[req->ns->anagrpid]) {
529 case NVME_ANA_INACCESSIBLE:
530 case NVME_ANA_PERSISTENT_LOSS:
531 break;
532 default:
533 id->nuse = id->nsze;
534 break;
535 }
536
537 if (req->ns->bdev)
538 nvmet_bdev_set_limits(req->ns->bdev, id);
539
540 /*
541 * We just provide a single LBA format that matches what the
542 * underlying device reports.
543 */
544 id->nlbaf = 0;
545 id->flbas = 0;
546
547 /*
548 * Our namespace might always be shared. Not just with other
549 * controllers, but also with any other user of the block device.
550 */
551 id->nmic = NVME_NS_NMIC_SHARED;
552 id->anagrpid = cpu_to_le32(req->ns->anagrpid);
553
554 memcpy(&id->nguid, &req->ns->nguid, sizeof(id->nguid));
555
556 id->lbaf[0].ds = req->ns->blksize_shift;
557
558 if (req->sq->ctrl->pi_support && nvmet_ns_has_pi(req->ns)) {
559 id->dpc = NVME_NS_DPC_PI_FIRST | NVME_NS_DPC_PI_LAST |
560 NVME_NS_DPC_PI_TYPE1 | NVME_NS_DPC_PI_TYPE2 |
561 NVME_NS_DPC_PI_TYPE3;
562 id->mc = NVME_MC_EXTENDED_LBA;
563 id->dps = req->ns->pi_type;
564 id->flbas = NVME_NS_FLBAS_META_EXT;
565 id->lbaf[0].ms = cpu_to_le16(req->ns->metadata_size);
566 }
567
568 if (req->ns->readonly)
569 id->nsattr |= NVME_NS_ATTR_RO;
570 done:
571 if (!status)
572 status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
573
574 kfree(id);
575 out:
576 nvmet_req_complete(req, status);
577 }
578
nvmet_execute_identify_nslist(struct nvmet_req * req)579 static void nvmet_execute_identify_nslist(struct nvmet_req *req)
580 {
581 static const int buf_size = NVME_IDENTIFY_DATA_SIZE;
582 struct nvmet_ctrl *ctrl = req->sq->ctrl;
583 struct nvmet_ns *ns;
584 unsigned long idx;
585 u32 min_nsid = le32_to_cpu(req->cmd->identify.nsid);
586 __le32 *list;
587 u16 status = 0;
588 int i = 0;
589
590 list = kzalloc(buf_size, GFP_KERNEL);
591 if (!list) {
592 status = NVME_SC_INTERNAL;
593 goto out;
594 }
595
596 xa_for_each(&ctrl->subsys->namespaces, idx, ns) {
597 if (ns->nsid <= min_nsid)
598 continue;
599 list[i++] = cpu_to_le32(ns->nsid);
600 if (i == buf_size / sizeof(__le32))
601 break;
602 }
603
604 status = nvmet_copy_to_sgl(req, 0, list, buf_size);
605
606 kfree(list);
607 out:
608 nvmet_req_complete(req, status);
609 }
610
nvmet_copy_ns_identifier(struct nvmet_req * req,u8 type,u8 len,void * id,off_t * off)611 static u16 nvmet_copy_ns_identifier(struct nvmet_req *req, u8 type, u8 len,
612 void *id, off_t *off)
613 {
614 struct nvme_ns_id_desc desc = {
615 .nidt = type,
616 .nidl = len,
617 };
618 u16 status;
619
620 status = nvmet_copy_to_sgl(req, *off, &desc, sizeof(desc));
621 if (status)
622 return status;
623 *off += sizeof(desc);
624
625 status = nvmet_copy_to_sgl(req, *off, id, len);
626 if (status)
627 return status;
628 *off += len;
629
630 return 0;
631 }
632
nvmet_execute_identify_desclist(struct nvmet_req * req)633 static void nvmet_execute_identify_desclist(struct nvmet_req *req)
634 {
635 off_t off = 0;
636 u16 status;
637
638 status = nvmet_req_find_ns(req);
639 if (status)
640 goto out;
641
642 if (memchr_inv(&req->ns->uuid, 0, sizeof(req->ns->uuid))) {
643 status = nvmet_copy_ns_identifier(req, NVME_NIDT_UUID,
644 NVME_NIDT_UUID_LEN,
645 &req->ns->uuid, &off);
646 if (status)
647 goto out;
648 }
649 if (memchr_inv(req->ns->nguid, 0, sizeof(req->ns->nguid))) {
650 status = nvmet_copy_ns_identifier(req, NVME_NIDT_NGUID,
651 NVME_NIDT_NGUID_LEN,
652 &req->ns->nguid, &off);
653 if (status)
654 goto out;
655 }
656
657 status = nvmet_copy_ns_identifier(req, NVME_NIDT_CSI,
658 NVME_NIDT_CSI_LEN,
659 &req->ns->csi, &off);
660 if (status)
661 goto out;
662
663 if (sg_zero_buffer(req->sg, req->sg_cnt, NVME_IDENTIFY_DATA_SIZE - off,
664 off) != NVME_IDENTIFY_DATA_SIZE - off)
665 status = NVME_SC_INTERNAL | NVME_SC_DNR;
666
667 out:
668 nvmet_req_complete(req, status);
669 }
670
nvmet_handle_identify_desclist(struct nvmet_req * req)671 static bool nvmet_handle_identify_desclist(struct nvmet_req *req)
672 {
673 switch (req->cmd->identify.csi) {
674 case NVME_CSI_NVM:
675 nvmet_execute_identify_desclist(req);
676 return true;
677 case NVME_CSI_ZNS:
678 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) {
679 nvmet_execute_identify_desclist(req);
680 return true;
681 }
682 return false;
683 default:
684 return false;
685 }
686 }
687
nvmet_execute_identify(struct nvmet_req * req)688 static void nvmet_execute_identify(struct nvmet_req *req)
689 {
690 if (!nvmet_check_transfer_len(req, NVME_IDENTIFY_DATA_SIZE))
691 return;
692
693 switch (req->cmd->identify.cns) {
694 case NVME_ID_CNS_NS:
695 switch (req->cmd->identify.csi) {
696 case NVME_CSI_NVM:
697 return nvmet_execute_identify_ns(req);
698 default:
699 break;
700 }
701 break;
702 case NVME_ID_CNS_CS_NS:
703 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) {
704 switch (req->cmd->identify.csi) {
705 case NVME_CSI_ZNS:
706 return nvmet_execute_identify_cns_cs_ns(req);
707 default:
708 break;
709 }
710 }
711 break;
712 case NVME_ID_CNS_CTRL:
713 switch (req->cmd->identify.csi) {
714 case NVME_CSI_NVM:
715 return nvmet_execute_identify_ctrl(req);
716 }
717 break;
718 case NVME_ID_CNS_CS_CTRL:
719 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) {
720 switch (req->cmd->identify.csi) {
721 case NVME_CSI_ZNS:
722 return nvmet_execute_identify_cns_cs_ctrl(req);
723 default:
724 break;
725 }
726 }
727 break;
728 case NVME_ID_CNS_NS_ACTIVE_LIST:
729 switch (req->cmd->identify.csi) {
730 case NVME_CSI_NVM:
731 return nvmet_execute_identify_nslist(req);
732 default:
733 break;
734 }
735 break;
736 case NVME_ID_CNS_NS_DESC_LIST:
737 if (nvmet_handle_identify_desclist(req) == true)
738 return;
739 break;
740 }
741
742 nvmet_req_cns_error_complete(req);
743 }
744
745 /*
746 * A "minimum viable" abort implementation: the command is mandatory in the
747 * spec, but we are not required to do any useful work. We couldn't really
748 * do a useful abort, so don't bother even with waiting for the command
749 * to be exectuted and return immediately telling the command to abort
750 * wasn't found.
751 */
nvmet_execute_abort(struct nvmet_req * req)752 static void nvmet_execute_abort(struct nvmet_req *req)
753 {
754 if (!nvmet_check_transfer_len(req, 0))
755 return;
756 nvmet_set_result(req, 1);
757 nvmet_req_complete(req, 0);
758 }
759
nvmet_write_protect_flush_sync(struct nvmet_req * req)760 static u16 nvmet_write_protect_flush_sync(struct nvmet_req *req)
761 {
762 u16 status;
763
764 if (req->ns->file)
765 status = nvmet_file_flush(req);
766 else
767 status = nvmet_bdev_flush(req);
768
769 if (status)
770 pr_err("write protect flush failed nsid: %u\n", req->ns->nsid);
771 return status;
772 }
773
nvmet_set_feat_write_protect(struct nvmet_req * req)774 static u16 nvmet_set_feat_write_protect(struct nvmet_req *req)
775 {
776 u32 write_protect = le32_to_cpu(req->cmd->common.cdw11);
777 struct nvmet_subsys *subsys = nvmet_req_subsys(req);
778 u16 status;
779
780 status = nvmet_req_find_ns(req);
781 if (status)
782 return status;
783
784 mutex_lock(&subsys->lock);
785 switch (write_protect) {
786 case NVME_NS_WRITE_PROTECT:
787 req->ns->readonly = true;
788 status = nvmet_write_protect_flush_sync(req);
789 if (status)
790 req->ns->readonly = false;
791 break;
792 case NVME_NS_NO_WRITE_PROTECT:
793 req->ns->readonly = false;
794 status = 0;
795 break;
796 default:
797 break;
798 }
799
800 if (!status)
801 nvmet_ns_changed(subsys, req->ns->nsid);
802 mutex_unlock(&subsys->lock);
803 return status;
804 }
805
nvmet_set_feat_kato(struct nvmet_req * req)806 u16 nvmet_set_feat_kato(struct nvmet_req *req)
807 {
808 u32 val32 = le32_to_cpu(req->cmd->common.cdw11);
809
810 nvmet_stop_keep_alive_timer(req->sq->ctrl);
811 req->sq->ctrl->kato = DIV_ROUND_UP(val32, 1000);
812 nvmet_start_keep_alive_timer(req->sq->ctrl);
813
814 nvmet_set_result(req, req->sq->ctrl->kato);
815
816 return 0;
817 }
818
nvmet_set_feat_async_event(struct nvmet_req * req,u32 mask)819 u16 nvmet_set_feat_async_event(struct nvmet_req *req, u32 mask)
820 {
821 u32 val32 = le32_to_cpu(req->cmd->common.cdw11);
822
823 if (val32 & ~mask) {
824 req->error_loc = offsetof(struct nvme_common_command, cdw11);
825 return NVME_SC_INVALID_FIELD | NVME_SC_DNR;
826 }
827
828 WRITE_ONCE(req->sq->ctrl->aen_enabled, val32);
829 nvmet_set_result(req, val32);
830
831 return 0;
832 }
833
nvmet_execute_set_features(struct nvmet_req * req)834 void nvmet_execute_set_features(struct nvmet_req *req)
835 {
836 struct nvmet_subsys *subsys = nvmet_req_subsys(req);
837 u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
838 u32 cdw11 = le32_to_cpu(req->cmd->common.cdw11);
839 u16 status = 0;
840 u16 nsqr;
841 u16 ncqr;
842
843 if (!nvmet_check_data_len_lte(req, 0))
844 return;
845
846 switch (cdw10 & 0xff) {
847 case NVME_FEAT_NUM_QUEUES:
848 ncqr = (cdw11 >> 16) & 0xffff;
849 nsqr = cdw11 & 0xffff;
850 if (ncqr == 0xffff || nsqr == 0xffff) {
851 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
852 break;
853 }
854 nvmet_set_result(req,
855 (subsys->max_qid - 1) | ((subsys->max_qid - 1) << 16));
856 break;
857 case NVME_FEAT_KATO:
858 status = nvmet_set_feat_kato(req);
859 break;
860 case NVME_FEAT_ASYNC_EVENT:
861 status = nvmet_set_feat_async_event(req, NVMET_AEN_CFG_ALL);
862 break;
863 case NVME_FEAT_HOST_ID:
864 status = NVME_SC_CMD_SEQ_ERROR | NVME_SC_DNR;
865 break;
866 case NVME_FEAT_WRITE_PROTECT:
867 status = nvmet_set_feat_write_protect(req);
868 break;
869 default:
870 req->error_loc = offsetof(struct nvme_common_command, cdw10);
871 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
872 break;
873 }
874
875 nvmet_req_complete(req, status);
876 }
877
nvmet_get_feat_write_protect(struct nvmet_req * req)878 static u16 nvmet_get_feat_write_protect(struct nvmet_req *req)
879 {
880 struct nvmet_subsys *subsys = nvmet_req_subsys(req);
881 u32 result;
882
883 result = nvmet_req_find_ns(req);
884 if (result)
885 return result;
886
887 mutex_lock(&subsys->lock);
888 if (req->ns->readonly == true)
889 result = NVME_NS_WRITE_PROTECT;
890 else
891 result = NVME_NS_NO_WRITE_PROTECT;
892 nvmet_set_result(req, result);
893 mutex_unlock(&subsys->lock);
894
895 return 0;
896 }
897
nvmet_get_feat_kato(struct nvmet_req * req)898 void nvmet_get_feat_kato(struct nvmet_req *req)
899 {
900 nvmet_set_result(req, req->sq->ctrl->kato * 1000);
901 }
902
nvmet_get_feat_async_event(struct nvmet_req * req)903 void nvmet_get_feat_async_event(struct nvmet_req *req)
904 {
905 nvmet_set_result(req, READ_ONCE(req->sq->ctrl->aen_enabled));
906 }
907
nvmet_execute_get_features(struct nvmet_req * req)908 void nvmet_execute_get_features(struct nvmet_req *req)
909 {
910 struct nvmet_subsys *subsys = nvmet_req_subsys(req);
911 u32 cdw10 = le32_to_cpu(req->cmd->common.cdw10);
912 u16 status = 0;
913
914 if (!nvmet_check_transfer_len(req, nvmet_feat_data_len(req, cdw10)))
915 return;
916
917 switch (cdw10 & 0xff) {
918 /*
919 * These features are mandatory in the spec, but we don't
920 * have a useful way to implement them. We'll eventually
921 * need to come up with some fake values for these.
922 */
923 #if 0
924 case NVME_FEAT_ARBITRATION:
925 break;
926 case NVME_FEAT_POWER_MGMT:
927 break;
928 case NVME_FEAT_TEMP_THRESH:
929 break;
930 case NVME_FEAT_ERR_RECOVERY:
931 break;
932 case NVME_FEAT_IRQ_COALESCE:
933 break;
934 case NVME_FEAT_IRQ_CONFIG:
935 break;
936 case NVME_FEAT_WRITE_ATOMIC:
937 break;
938 #endif
939 case NVME_FEAT_ASYNC_EVENT:
940 nvmet_get_feat_async_event(req);
941 break;
942 case NVME_FEAT_VOLATILE_WC:
943 nvmet_set_result(req, 1);
944 break;
945 case NVME_FEAT_NUM_QUEUES:
946 nvmet_set_result(req,
947 (subsys->max_qid-1) | ((subsys->max_qid-1) << 16));
948 break;
949 case NVME_FEAT_KATO:
950 nvmet_get_feat_kato(req);
951 break;
952 case NVME_FEAT_HOST_ID:
953 /* need 128-bit host identifier flag */
954 if (!(req->cmd->common.cdw11 & cpu_to_le32(1 << 0))) {
955 req->error_loc =
956 offsetof(struct nvme_common_command, cdw11);
957 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
958 break;
959 }
960
961 status = nvmet_copy_to_sgl(req, 0, &req->sq->ctrl->hostid,
962 sizeof(req->sq->ctrl->hostid));
963 break;
964 case NVME_FEAT_WRITE_PROTECT:
965 status = nvmet_get_feat_write_protect(req);
966 break;
967 default:
968 req->error_loc =
969 offsetof(struct nvme_common_command, cdw10);
970 status = NVME_SC_INVALID_FIELD | NVME_SC_DNR;
971 break;
972 }
973
974 nvmet_req_complete(req, status);
975 }
976
nvmet_execute_async_event(struct nvmet_req * req)977 void nvmet_execute_async_event(struct nvmet_req *req)
978 {
979 struct nvmet_ctrl *ctrl = req->sq->ctrl;
980
981 if (!nvmet_check_transfer_len(req, 0))
982 return;
983
984 mutex_lock(&ctrl->lock);
985 if (ctrl->nr_async_event_cmds >= NVMET_ASYNC_EVENTS) {
986 mutex_unlock(&ctrl->lock);
987 nvmet_req_complete(req, NVME_SC_ASYNC_LIMIT | NVME_SC_DNR);
988 return;
989 }
990 ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req;
991 mutex_unlock(&ctrl->lock);
992
993 queue_work(nvmet_wq, &ctrl->async_event_work);
994 }
995
nvmet_execute_keep_alive(struct nvmet_req * req)996 void nvmet_execute_keep_alive(struct nvmet_req *req)
997 {
998 struct nvmet_ctrl *ctrl = req->sq->ctrl;
999 u16 status = 0;
1000
1001 if (!nvmet_check_transfer_len(req, 0))
1002 return;
1003
1004 if (!ctrl->kato) {
1005 status = NVME_SC_KA_TIMEOUT_INVALID;
1006 goto out;
1007 }
1008
1009 pr_debug("ctrl %d update keep-alive timer for %d secs\n",
1010 ctrl->cntlid, ctrl->kato);
1011 mod_delayed_work(system_wq, &ctrl->ka_work, ctrl->kato * HZ);
1012 out:
1013 nvmet_req_complete(req, status);
1014 }
1015
nvmet_parse_admin_cmd(struct nvmet_req * req)1016 u16 nvmet_parse_admin_cmd(struct nvmet_req *req)
1017 {
1018 struct nvme_command *cmd = req->cmd;
1019 u16 ret;
1020
1021 if (nvme_is_fabrics(cmd))
1022 return nvmet_parse_fabrics_admin_cmd(req);
1023 if (unlikely(!nvmet_check_auth_status(req)))
1024 return NVME_SC_AUTH_REQUIRED | NVME_SC_DNR;
1025 if (nvmet_is_disc_subsys(nvmet_req_subsys(req)))
1026 return nvmet_parse_discovery_cmd(req);
1027
1028 ret = nvmet_check_ctrl_status(req);
1029 if (unlikely(ret))
1030 return ret;
1031
1032 if (nvmet_is_passthru_req(req))
1033 return nvmet_parse_passthru_admin_cmd(req);
1034
1035 switch (cmd->common.opcode) {
1036 case nvme_admin_get_log_page:
1037 req->execute = nvmet_execute_get_log_page;
1038 return 0;
1039 case nvme_admin_identify:
1040 req->execute = nvmet_execute_identify;
1041 return 0;
1042 case nvme_admin_abort_cmd:
1043 req->execute = nvmet_execute_abort;
1044 return 0;
1045 case nvme_admin_set_features:
1046 req->execute = nvmet_execute_set_features;
1047 return 0;
1048 case nvme_admin_get_features:
1049 req->execute = nvmet_execute_get_features;
1050 return 0;
1051 case nvme_admin_async_event:
1052 req->execute = nvmet_execute_async_event;
1053 return 0;
1054 case nvme_admin_keep_alive:
1055 req->execute = nvmet_execute_keep_alive;
1056 return 0;
1057 default:
1058 return nvmet_report_invalid_opcode(req);
1059 }
1060 }
1061