1// SPDX-License-Identifier: GPL-2.0
2/*
3 * NVMe ZNS-ZBD command implementation.
4 * Copyright (C) 2021 Western Digital Corporation or its affiliates.
5 */
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7#include <linux/nvme.h>
8#include <linux/blkdev.h>
9#include "nvmet.h"
10
11/*
12 * We set the Memory Page Size Minimum (MPSMIN) for target controller to 0
13 * which gets added by 12 in the nvme_enable_ctrl() which results in 2^12 = 4k
14 * as page_shift value. When calculating the ZASL use shift by 12.
15 */
16#define NVMET_MPSMIN_SHIFT 12
17
18static inline u8 nvmet_zasl(unsigned int zone_append_sects)
19{
20 /*
21 * Zone Append Size Limit (zasl) is expressed as a power of 2 value
22 * with the minimum memory page size (i.e. 12) as unit.
23 */
24 return ilog2(zone_append_sects >> (NVMET_MPSMIN_SHIFT - 9));
25}
26
27static int validate_conv_zones_cb(struct blk_zone *z,
28 unsigned int i, void *data)
29{
30 if (z->type == BLK_ZONE_TYPE_CONVENTIONAL)
31 return -EOPNOTSUPP;
32 return 0;
33}
34
35bool nvmet_bdev_zns_enable(struct nvmet_ns *ns)
36{
37 u8 zasl = nvmet_zasl(zone_append_sects: bdev_max_zone_append_sectors(bdev: ns->bdev));
38 struct gendisk *bd_disk = ns->bdev->bd_disk;
39 int ret;
40
41 if (ns->subsys->zasl) {
42 if (ns->subsys->zasl > zasl)
43 return false;
44 }
45 ns->subsys->zasl = zasl;
46
47 /*
48 * Generic zoned block devices may have a smaller last zone which is
49 * not supported by ZNS. Exclude zoned drives that have such smaller
50 * last zone.
51 */
52 if (get_capacity(disk: bd_disk) & (bdev_zone_sectors(bdev: ns->bdev) - 1))
53 return false;
54 /*
55 * ZNS does not define a conventional zone type. Use report zones
56 * to detect if the device has conventional zones and reject it if
57 * it does.
58 */
59 ret = blkdev_report_zones(bdev: ns->bdev, sector: 0, nr_zones: bdev_nr_zones(bdev: ns->bdev),
60 cb: validate_conv_zones_cb, NULL);
61 if (ret < 0)
62 return false;
63
64 ns->blksize_shift = blksize_bits(size: bdev_logical_block_size(bdev: ns->bdev));
65
66 return true;
67}
68
69void nvmet_execute_identify_ctrl_zns(struct nvmet_req *req)
70{
71 u8 zasl = req->sq->ctrl->subsys->zasl;
72 struct nvmet_ctrl *ctrl = req->sq->ctrl;
73 struct nvme_id_ctrl_zns *id;
74 u16 status;
75
76 id = kzalloc(sizeof(*id), GFP_KERNEL);
77 if (!id) {
78 status = NVME_SC_INTERNAL;
79 goto out;
80 }
81
82 if (ctrl->ops->get_mdts)
83 id->zasl = min_t(u8, ctrl->ops->get_mdts(ctrl), zasl);
84 else
85 id->zasl = zasl;
86
87 status = nvmet_copy_to_sgl(req, off: 0, buf: id, len: sizeof(*id));
88
89 kfree(objp: id);
90out:
91 nvmet_req_complete(req, status);
92}
93
94void nvmet_execute_identify_ns_zns(struct nvmet_req *req)
95{
96 struct nvme_id_ns_zns *id_zns = NULL;
97 u64 zsze;
98 u16 status;
99 u32 mar, mor;
100
101 if (le32_to_cpu(req->cmd->identify.nsid) == NVME_NSID_ALL) {
102 req->error_loc = offsetof(struct nvme_identify, nsid);
103 status = NVME_SC_INVALID_NS | NVME_STATUS_DNR;
104 goto out;
105 }
106
107 id_zns = kzalloc(sizeof(*id_zns), GFP_KERNEL);
108 if (!id_zns) {
109 status = NVME_SC_INTERNAL;
110 goto out;
111 }
112
113 status = nvmet_req_find_ns(req);
114 if (status)
115 goto done;
116
117 if (nvmet_ns_revalidate(ns: req->ns)) {
118 mutex_lock(&req->ns->subsys->lock);
119 nvmet_ns_changed(subsys: req->ns->subsys, nsid: req->ns->nsid);
120 mutex_unlock(lock: &req->ns->subsys->lock);
121 }
122
123 if (!bdev_is_zoned(bdev: req->ns->bdev)) {
124 status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
125 req->error_loc = offsetof(struct nvme_identify, nsid);
126 goto out;
127 }
128
129 zsze = (bdev_zone_sectors(bdev: req->ns->bdev) << 9) >>
130 req->ns->blksize_shift;
131 id_zns->lbafe[0].zsze = cpu_to_le64(zsze);
132
133 mor = bdev_max_open_zones(bdev: req->ns->bdev);
134 if (!mor)
135 mor = U32_MAX;
136 else
137 mor--;
138 id_zns->mor = cpu_to_le32(mor);
139
140 mar = bdev_max_active_zones(bdev: req->ns->bdev);
141 if (!mar)
142 mar = U32_MAX;
143 else
144 mar--;
145 id_zns->mar = cpu_to_le32(mar);
146
147done:
148 status = nvmet_copy_to_sgl(req, off: 0, buf: id_zns, len: sizeof(*id_zns));
149out:
150 kfree(objp: id_zns);
151 nvmet_req_complete(req, status);
152}
153
154static u16 nvmet_bdev_validate_zone_mgmt_recv(struct nvmet_req *req)
155{
156 sector_t sect = nvmet_lba_to_sect(ns: req->ns, lba: req->cmd->zmr.slba);
157 u32 out_bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2;
158
159 if (sect >= get_capacity(disk: req->ns->bdev->bd_disk)) {
160 req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, slba);
161 return NVME_SC_LBA_RANGE | NVME_STATUS_DNR;
162 }
163
164 if (out_bufsize < sizeof(struct nvme_zone_report)) {
165 req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, numd);
166 return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
167 }
168
169 if (req->cmd->zmr.zra != NVME_ZRA_ZONE_REPORT) {
170 req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, zra);
171 return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
172 }
173
174 switch (req->cmd->zmr.pr) {
175 case 0:
176 case 1:
177 break;
178 default:
179 req->error_loc = offsetof(struct nvme_zone_mgmt_recv_cmd, pr);
180 return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
181 }
182
183 switch (req->cmd->zmr.zrasf) {
184 case NVME_ZRASF_ZONE_REPORT_ALL:
185 case NVME_ZRASF_ZONE_STATE_EMPTY:
186 case NVME_ZRASF_ZONE_STATE_IMP_OPEN:
187 case NVME_ZRASF_ZONE_STATE_EXP_OPEN:
188 case NVME_ZRASF_ZONE_STATE_CLOSED:
189 case NVME_ZRASF_ZONE_STATE_FULL:
190 case NVME_ZRASF_ZONE_STATE_READONLY:
191 case NVME_ZRASF_ZONE_STATE_OFFLINE:
192 break;
193 default:
194 req->error_loc =
195 offsetof(struct nvme_zone_mgmt_recv_cmd, zrasf);
196 return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
197 }
198
199 return NVME_SC_SUCCESS;
200}
201
202struct nvmet_report_zone_data {
203 struct nvmet_req *req;
204 u64 out_buf_offset;
205 u64 out_nr_zones;
206 u64 nr_zones;
207 u8 zrasf;
208};
209
210static int nvmet_bdev_report_zone_cb(struct blk_zone *z, unsigned i, void *d)
211{
212 static const unsigned int nvme_zrasf_to_blk_zcond[] = {
213 [NVME_ZRASF_ZONE_STATE_EMPTY] = BLK_ZONE_COND_EMPTY,
214 [NVME_ZRASF_ZONE_STATE_IMP_OPEN] = BLK_ZONE_COND_IMP_OPEN,
215 [NVME_ZRASF_ZONE_STATE_EXP_OPEN] = BLK_ZONE_COND_EXP_OPEN,
216 [NVME_ZRASF_ZONE_STATE_CLOSED] = BLK_ZONE_COND_CLOSED,
217 [NVME_ZRASF_ZONE_STATE_READONLY] = BLK_ZONE_COND_READONLY,
218 [NVME_ZRASF_ZONE_STATE_FULL] = BLK_ZONE_COND_FULL,
219 [NVME_ZRASF_ZONE_STATE_OFFLINE] = BLK_ZONE_COND_OFFLINE,
220 };
221 struct nvmet_report_zone_data *rz = d;
222
223 if (rz->zrasf != NVME_ZRASF_ZONE_REPORT_ALL &&
224 z->cond != nvme_zrasf_to_blk_zcond[rz->zrasf])
225 return 0;
226
227 if (rz->nr_zones < rz->out_nr_zones) {
228 struct nvme_zone_descriptor zdesc = { };
229 u16 status;
230
231 zdesc.zcap = nvmet_sect_to_lba(ns: rz->req->ns, sect: z->capacity);
232 zdesc.zslba = nvmet_sect_to_lba(ns: rz->req->ns, sect: z->start);
233 zdesc.wp = nvmet_sect_to_lba(ns: rz->req->ns, sect: z->wp);
234 zdesc.za = z->reset ? 1 << 2 : 0;
235 zdesc.zs = z->cond << 4;
236 zdesc.zt = z->type;
237
238 status = nvmet_copy_to_sgl(req: rz->req, off: rz->out_buf_offset, buf: &zdesc,
239 len: sizeof(zdesc));
240 if (status)
241 return -EINVAL;
242
243 rz->out_buf_offset += sizeof(zdesc);
244 }
245
246 rz->nr_zones++;
247
248 return 0;
249}
250
251static unsigned long nvmet_req_nr_zones_from_slba(struct nvmet_req *req)
252{
253 unsigned int sect = nvmet_lba_to_sect(ns: req->ns, lba: req->cmd->zmr.slba);
254
255 return bdev_nr_zones(bdev: req->ns->bdev) - bdev_zone_no(bdev: req->ns->bdev, sec: sect);
256}
257
258static unsigned long get_nr_zones_from_buf(struct nvmet_req *req, u32 bufsize)
259{
260 if (bufsize <= sizeof(struct nvme_zone_report))
261 return 0;
262
263 return (bufsize - sizeof(struct nvme_zone_report)) /
264 sizeof(struct nvme_zone_descriptor);
265}
266
267static void nvmet_bdev_zone_zmgmt_recv_work(struct work_struct *w)
268{
269 struct nvmet_req *req = container_of(w, struct nvmet_req, z.zmgmt_work);
270 sector_t start_sect = nvmet_lba_to_sect(ns: req->ns, lba: req->cmd->zmr.slba);
271 unsigned long req_slba_nr_zones = nvmet_req_nr_zones_from_slba(req);
272 u32 out_bufsize = (le32_to_cpu(req->cmd->zmr.numd) + 1) << 2;
273 __le64 nr_zones;
274 u16 status;
275 int ret;
276 struct nvmet_report_zone_data rz_data = {
277 .out_nr_zones = get_nr_zones_from_buf(req, bufsize: out_bufsize),
278 /* leave the place for report zone header */
279 .out_buf_offset = sizeof(struct nvme_zone_report),
280 .zrasf = req->cmd->zmr.zrasf,
281 .nr_zones = 0,
282 .req = req,
283 };
284
285 status = nvmet_bdev_validate_zone_mgmt_recv(req);
286 if (status)
287 goto out;
288
289 if (!req_slba_nr_zones) {
290 status = NVME_SC_SUCCESS;
291 goto out;
292 }
293
294 ret = blkdev_report_zones(bdev: req->ns->bdev, sector: start_sect, nr_zones: req_slba_nr_zones,
295 cb: nvmet_bdev_report_zone_cb, data: &rz_data);
296 if (ret < 0) {
297 status = NVME_SC_INTERNAL;
298 goto out;
299 }
300
301 /*
302 * When partial bit is set nr_zones must indicate the number of zone
303 * descriptors actually transferred.
304 */
305 if (req->cmd->zmr.pr)
306 rz_data.nr_zones = min(rz_data.nr_zones, rz_data.out_nr_zones);
307
308 nr_zones = cpu_to_le64(rz_data.nr_zones);
309 status = nvmet_copy_to_sgl(req, off: 0, buf: &nr_zones, len: sizeof(nr_zones));
310
311out:
312 nvmet_req_complete(req, status);
313}
314
315void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req)
316{
317 INIT_WORK(&req->z.zmgmt_work, nvmet_bdev_zone_zmgmt_recv_work);
318 queue_work(wq: zbd_wq, work: &req->z.zmgmt_work);
319}
320
321static inline enum req_op zsa_req_op(u8 zsa)
322{
323 switch (zsa) {
324 case NVME_ZONE_OPEN:
325 return REQ_OP_ZONE_OPEN;
326 case NVME_ZONE_CLOSE:
327 return REQ_OP_ZONE_CLOSE;
328 case NVME_ZONE_FINISH:
329 return REQ_OP_ZONE_FINISH;
330 case NVME_ZONE_RESET:
331 return REQ_OP_ZONE_RESET;
332 default:
333 return REQ_OP_LAST;
334 }
335}
336
337static u16 blkdev_zone_mgmt_errno_to_nvme_status(int ret)
338{
339 switch (ret) {
340 case 0:
341 return NVME_SC_SUCCESS;
342 case -EINVAL:
343 case -EIO:
344 return NVME_SC_ZONE_INVALID_TRANSITION | NVME_STATUS_DNR;
345 default:
346 return NVME_SC_INTERNAL;
347 }
348}
349
350struct nvmet_zone_mgmt_send_all_data {
351 unsigned long *zbitmap;
352 struct nvmet_req *req;
353};
354
355static int zmgmt_send_scan_cb(struct blk_zone *z, unsigned i, void *d)
356{
357 struct nvmet_zone_mgmt_send_all_data *data = d;
358
359 switch (zsa_req_op(zsa: data->req->cmd->zms.zsa)) {
360 case REQ_OP_ZONE_OPEN:
361 switch (z->cond) {
362 case BLK_ZONE_COND_CLOSED:
363 break;
364 default:
365 return 0;
366 }
367 break;
368 case REQ_OP_ZONE_CLOSE:
369 switch (z->cond) {
370 case BLK_ZONE_COND_IMP_OPEN:
371 case BLK_ZONE_COND_EXP_OPEN:
372 break;
373 default:
374 return 0;
375 }
376 break;
377 case REQ_OP_ZONE_FINISH:
378 switch (z->cond) {
379 case BLK_ZONE_COND_IMP_OPEN:
380 case BLK_ZONE_COND_EXP_OPEN:
381 case BLK_ZONE_COND_CLOSED:
382 break;
383 default:
384 return 0;
385 }
386 break;
387 default:
388 return -EINVAL;
389 }
390
391 set_bit(nr: i, addr: data->zbitmap);
392
393 return 0;
394}
395
396static u16 nvmet_bdev_zone_mgmt_emulate_all(struct nvmet_req *req)
397{
398 struct block_device *bdev = req->ns->bdev;
399 unsigned int nr_zones = bdev_nr_zones(bdev);
400 struct bio *bio = NULL;
401 sector_t sector = 0;
402 int ret;
403 struct nvmet_zone_mgmt_send_all_data d = {
404 .req = req,
405 };
406
407 d.zbitmap = kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(*(d.zbitmap)),
408 GFP_NOIO, bdev->bd_disk->node_id);
409 if (!d.zbitmap) {
410 ret = -ENOMEM;
411 goto out;
412 }
413
414 /* Scan and build bitmap of the eligible zones */
415 ret = blkdev_report_zones(bdev, sector: 0, nr_zones, cb: zmgmt_send_scan_cb, data: &d);
416 if (ret != nr_zones) {
417 if (ret > 0)
418 ret = -EIO;
419 goto out;
420 } else {
421 /* We scanned all the zones */
422 ret = 0;
423 }
424
425 while (sector < bdev_nr_sectors(bdev)) {
426 if (test_bit(disk_zone_no(bdev->bd_disk, sector), d.zbitmap)) {
427 bio = blk_next_bio(bio, bdev, nr_pages: 0,
428 opf: zsa_req_op(zsa: req->cmd->zms.zsa) | REQ_SYNC,
429 GFP_KERNEL);
430 bio->bi_iter.bi_sector = sector;
431 /* This may take a while, so be nice to others */
432 cond_resched();
433 }
434 sector += bdev_zone_sectors(bdev);
435 }
436
437 if (bio) {
438 ret = submit_bio_wait(bio);
439 bio_put(bio);
440 }
441
442out:
443 kfree(objp: d.zbitmap);
444
445 return blkdev_zone_mgmt_errno_to_nvme_status(ret);
446}
447
448static u16 nvmet_bdev_execute_zmgmt_send_all(struct nvmet_req *req)
449{
450 int ret;
451
452 switch (zsa_req_op(zsa: req->cmd->zms.zsa)) {
453 case REQ_OP_ZONE_RESET:
454 ret = blkdev_zone_mgmt(bdev: req->ns->bdev, op: REQ_OP_ZONE_RESET, sectors: 0,
455 nr_sectors: get_capacity(disk: req->ns->bdev->bd_disk));
456 if (ret < 0)
457 return blkdev_zone_mgmt_errno_to_nvme_status(ret);
458 break;
459 case REQ_OP_ZONE_OPEN:
460 case REQ_OP_ZONE_CLOSE:
461 case REQ_OP_ZONE_FINISH:
462 return nvmet_bdev_zone_mgmt_emulate_all(req);
463 default:
464 /* this is needed to quiet compiler warning */
465 req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, zsa);
466 return NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
467 }
468
469 return NVME_SC_SUCCESS;
470}
471
472static void nvmet_bdev_zmgmt_send_work(struct work_struct *w)
473{
474 struct nvmet_req *req = container_of(w, struct nvmet_req, z.zmgmt_work);
475 sector_t sect = nvmet_lba_to_sect(ns: req->ns, lba: req->cmd->zms.slba);
476 enum req_op op = zsa_req_op(zsa: req->cmd->zms.zsa);
477 struct block_device *bdev = req->ns->bdev;
478 sector_t zone_sectors = bdev_zone_sectors(bdev);
479 u16 status = NVME_SC_SUCCESS;
480 int ret;
481
482 if (op == REQ_OP_LAST) {
483 req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, zsa);
484 status = NVME_SC_ZONE_INVALID_TRANSITION | NVME_STATUS_DNR;
485 goto out;
486 }
487
488 /* when select all bit is set slba field is ignored */
489 if (req->cmd->zms.select_all) {
490 status = nvmet_bdev_execute_zmgmt_send_all(req);
491 goto out;
492 }
493
494 if (sect >= get_capacity(disk: bdev->bd_disk)) {
495 req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, slba);
496 status = NVME_SC_LBA_RANGE | NVME_STATUS_DNR;
497 goto out;
498 }
499
500 if (sect & (zone_sectors - 1)) {
501 req->error_loc = offsetof(struct nvme_zone_mgmt_send_cmd, slba);
502 status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
503 goto out;
504 }
505
506 ret = blkdev_zone_mgmt(bdev, op, sectors: sect, nr_sectors: zone_sectors);
507 if (ret < 0)
508 status = blkdev_zone_mgmt_errno_to_nvme_status(ret);
509
510out:
511 nvmet_req_complete(req, status);
512}
513
514void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req)
515{
516 INIT_WORK(&req->z.zmgmt_work, nvmet_bdev_zmgmt_send_work);
517 queue_work(wq: zbd_wq, work: &req->z.zmgmt_work);
518}
519
520static void nvmet_bdev_zone_append_bio_done(struct bio *bio)
521{
522 struct nvmet_req *req = bio->bi_private;
523
524 if (bio->bi_status == BLK_STS_OK) {
525 req->cqe->result.u64 =
526 nvmet_sect_to_lba(ns: req->ns, sect: bio->bi_iter.bi_sector);
527 }
528
529 nvmet_req_complete(req, status: blk_to_nvme_status(req, blk_sts: bio->bi_status));
530 nvmet_req_bio_put(req, bio);
531}
532
533void nvmet_bdev_execute_zone_append(struct nvmet_req *req)
534{
535 sector_t sect = nvmet_lba_to_sect(ns: req->ns, lba: req->cmd->rw.slba);
536 const blk_opf_t opf = REQ_OP_ZONE_APPEND | REQ_SYNC | REQ_IDLE;
537 u16 status = NVME_SC_SUCCESS;
538 unsigned int total_len = 0;
539 struct scatterlist *sg;
540 u32 data_len = nvmet_rw_data_len(req);
541 struct bio *bio;
542 int sg_cnt;
543
544 /* Request is completed on len mismatch in nvmet_check_transfer_len() */
545 if (!nvmet_check_transfer_len(req, len: nvmet_rw_data_len(req)))
546 return;
547
548 if (data_len >
549 bdev_max_zone_append_sectors(bdev: req->ns->bdev) << SECTOR_SHIFT) {
550 req->error_loc = offsetof(struct nvme_rw_command, length);
551 status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
552 goto out;
553 }
554
555 if (!req->sg_cnt) {
556 nvmet_req_complete(req, status: 0);
557 return;
558 }
559
560 if (sect >= get_capacity(disk: req->ns->bdev->bd_disk)) {
561 req->error_loc = offsetof(struct nvme_rw_command, slba);
562 status = NVME_SC_LBA_RANGE | NVME_STATUS_DNR;
563 goto out;
564 }
565
566 if (sect & (bdev_zone_sectors(bdev: req->ns->bdev) - 1)) {
567 req->error_loc = offsetof(struct nvme_rw_command, slba);
568 status = NVME_SC_INVALID_FIELD | NVME_STATUS_DNR;
569 goto out;
570 }
571
572 if (nvmet_use_inline_bvec(req)) {
573 bio = &req->z.inline_bio;
574 bio_init(bio, bdev: req->ns->bdev, table: req->inline_bvec,
575 ARRAY_SIZE(req->inline_bvec), opf);
576 } else {
577 bio = bio_alloc(bdev: req->ns->bdev, nr_vecs: req->sg_cnt, opf, GFP_KERNEL);
578 }
579
580 bio->bi_end_io = nvmet_bdev_zone_append_bio_done;
581 bio->bi_iter.bi_sector = sect;
582 bio->bi_private = req;
583 if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
584 bio->bi_opf |= REQ_FUA;
585
586 for_each_sg(req->sg, sg, req->sg_cnt, sg_cnt) {
587 unsigned int len = sg->length;
588
589 if (bio_add_page(bio, page: sg_page(sg), len, off: sg->offset) != len) {
590 status = NVME_SC_INTERNAL;
591 goto out_put_bio;
592 }
593 total_len += len;
594 }
595
596 if (total_len != data_len) {
597 status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
598 goto out_put_bio;
599 }
600
601 submit_bio(bio);
602 return;
603
604out_put_bio:
605 nvmet_req_bio_put(req, bio);
606out:
607 nvmet_req_complete(req, status);
608}
609
610u16 nvmet_bdev_zns_parse_io_cmd(struct nvmet_req *req)
611{
612 struct nvme_command *cmd = req->cmd;
613
614 switch (cmd->common.opcode) {
615 case nvme_cmd_zone_append:
616 req->execute = nvmet_bdev_execute_zone_append;
617 return 0;
618 case nvme_cmd_zone_mgmt_recv:
619 req->execute = nvmet_bdev_execute_zone_mgmt_recv;
620 return 0;
621 case nvme_cmd_zone_mgmt_send:
622 req->execute = nvmet_bdev_execute_zone_mgmt_send;
623 return 0;
624 default:
625 return nvmet_bdev_parse_io_cmd(req);
626 }
627}
628

source code of linux/drivers/nvme/target/zns.c