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