1 /*
2 * Definitions for the NVM Express interface
3 * Copyright (c) 2011-2014, Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 */
14
15 #ifndef _LINUX_NVME_H
16 #define _LINUX_NVME_H
17
18 #include <linux/types.h>
19 #include <linux/uuid.h>
20
21 /* NQN names in commands fields specified one size */
22 #define NVMF_NQN_FIELD_LEN 256
23
24 /* However the max length of a qualified name is another size */
25 #define NVMF_NQN_SIZE 223
26
27 #define NVMF_TRSVCID_SIZE 32
28 #define NVMF_TRADDR_SIZE 256
29 #define NVMF_TSAS_SIZE 256
30
31 #define NVME_DISC_SUBSYS_NAME "nqn.2014-08.org.nvmexpress.discovery"
32
33 #define NVME_RDMA_IP_PORT 4420
34
35 #define NVME_NSID_ALL 0xffffffff
36
37 enum nvme_subsys_type {
38 NVME_NQN_DISC = 1, /* Discovery type target subsystem */
39 NVME_NQN_NVME = 2, /* NVME type target subsystem */
40 };
41
42 /* Address Family codes for Discovery Log Page entry ADRFAM field */
43 enum {
44 NVMF_ADDR_FAMILY_PCI = 0, /* PCIe */
45 NVMF_ADDR_FAMILY_IP4 = 1, /* IP4 */
46 NVMF_ADDR_FAMILY_IP6 = 2, /* IP6 */
47 NVMF_ADDR_FAMILY_IB = 3, /* InfiniBand */
48 NVMF_ADDR_FAMILY_FC = 4, /* Fibre Channel */
49 };
50
51 /* Transport Type codes for Discovery Log Page entry TRTYPE field */
52 enum {
53 NVMF_TRTYPE_RDMA = 1, /* RDMA */
54 NVMF_TRTYPE_FC = 2, /* Fibre Channel */
55 NVMF_TRTYPE_LOOP = 254, /* Reserved for host usage */
56 NVMF_TRTYPE_MAX,
57 };
58
59 /* Transport Requirements codes for Discovery Log Page entry TREQ field */
60 enum {
61 NVMF_TREQ_NOT_SPECIFIED = 0, /* Not specified */
62 NVMF_TREQ_REQUIRED = 1, /* Required */
63 NVMF_TREQ_NOT_REQUIRED = 2, /* Not Required */
64 };
65
66 /* RDMA QP Service Type codes for Discovery Log Page entry TSAS
67 * RDMA_QPTYPE field
68 */
69 enum {
70 NVMF_RDMA_QPTYPE_CONNECTED = 1, /* Reliable Connected */
71 NVMF_RDMA_QPTYPE_DATAGRAM = 2, /* Reliable Datagram */
72 };
73
74 /* RDMA QP Service Type codes for Discovery Log Page entry TSAS
75 * RDMA_QPTYPE field
76 */
77 enum {
78 NVMF_RDMA_PRTYPE_NOT_SPECIFIED = 1, /* No Provider Specified */
79 NVMF_RDMA_PRTYPE_IB = 2, /* InfiniBand */
80 NVMF_RDMA_PRTYPE_ROCE = 3, /* InfiniBand RoCE */
81 NVMF_RDMA_PRTYPE_ROCEV2 = 4, /* InfiniBand RoCEV2 */
82 NVMF_RDMA_PRTYPE_IWARP = 5, /* IWARP */
83 };
84
85 /* RDMA Connection Management Service Type codes for Discovery Log Page
86 * entry TSAS RDMA_CMS field
87 */
88 enum {
89 NVMF_RDMA_CMS_RDMA_CM = 1, /* Sockets based endpoint addressing */
90 };
91
92 #define NVME_AQ_DEPTH 32
93 #define NVME_NR_AEN_COMMANDS 1
94 #define NVME_AQ_BLK_MQ_DEPTH (NVME_AQ_DEPTH - NVME_NR_AEN_COMMANDS)
95
96 /*
97 * Subtract one to leave an empty queue entry for 'Full Queue' condition. See
98 * NVM-Express 1.2 specification, section 4.1.2.
99 */
100 #define NVME_AQ_MQ_TAG_DEPTH (NVME_AQ_BLK_MQ_DEPTH - 1)
101
102 enum {
103 NVME_REG_CAP = 0x0000, /* Controller Capabilities */
104 NVME_REG_VS = 0x0008, /* Version */
105 NVME_REG_INTMS = 0x000c, /* Interrupt Mask Set */
106 NVME_REG_INTMC = 0x0010, /* Interrupt Mask Clear */
107 NVME_REG_CC = 0x0014, /* Controller Configuration */
108 NVME_REG_CSTS = 0x001c, /* Controller Status */
109 NVME_REG_NSSR = 0x0020, /* NVM Subsystem Reset */
110 NVME_REG_AQA = 0x0024, /* Admin Queue Attributes */
111 NVME_REG_ASQ = 0x0028, /* Admin SQ Base Address */
112 NVME_REG_ACQ = 0x0030, /* Admin CQ Base Address */
113 NVME_REG_CMBLOC = 0x0038, /* Controller Memory Buffer Location */
114 NVME_REG_CMBSZ = 0x003c, /* Controller Memory Buffer Size */
115 NVME_REG_DBS = 0x1000, /* SQ 0 Tail Doorbell */
116 };
117
118 #define NVME_CAP_MQES(cap) ((cap) & 0xffff)
119 #define NVME_CAP_TIMEOUT(cap) (((cap) >> 24) & 0xff)
120 #define NVME_CAP_STRIDE(cap) (((cap) >> 32) & 0xf)
121 #define NVME_CAP_NSSRC(cap) (((cap) >> 36) & 0x1)
122 #define NVME_CAP_MPSMIN(cap) (((cap) >> 48) & 0xf)
123 #define NVME_CAP_MPSMAX(cap) (((cap) >> 52) & 0xf)
124
125 #define NVME_CMB_BIR(cmbloc) ((cmbloc) & 0x7)
126 #define NVME_CMB_OFST(cmbloc) (((cmbloc) >> 12) & 0xfffff)
127
128 enum {
129 NVME_CMBSZ_SQS = 1 << 0,
130 NVME_CMBSZ_CQS = 1 << 1,
131 NVME_CMBSZ_LISTS = 1 << 2,
132 NVME_CMBSZ_RDS = 1 << 3,
133 NVME_CMBSZ_WDS = 1 << 4,
134
135 NVME_CMBSZ_SZ_SHIFT = 12,
136 NVME_CMBSZ_SZ_MASK = 0xfffff,
137
138 NVME_CMBSZ_SZU_SHIFT = 8,
139 NVME_CMBSZ_SZU_MASK = 0xf,
140 };
141
142 /*
143 * Submission and Completion Queue Entry Sizes for the NVM command set.
144 * (In bytes and specified as a power of two (2^n)).
145 */
146 #define NVME_NVM_IOSQES 6
147 #define NVME_NVM_IOCQES 4
148
149 enum {
150 NVME_CC_ENABLE = 1 << 0,
151 NVME_CC_CSS_NVM = 0 << 4,
152 NVME_CC_EN_SHIFT = 0,
153 NVME_CC_CSS_SHIFT = 4,
154 NVME_CC_MPS_SHIFT = 7,
155 NVME_CC_AMS_SHIFT = 11,
156 NVME_CC_SHN_SHIFT = 14,
157 NVME_CC_IOSQES_SHIFT = 16,
158 NVME_CC_IOCQES_SHIFT = 20,
159 NVME_CC_AMS_RR = 0 << NVME_CC_AMS_SHIFT,
160 NVME_CC_AMS_WRRU = 1 << NVME_CC_AMS_SHIFT,
161 NVME_CC_AMS_VS = 7 << NVME_CC_AMS_SHIFT,
162 NVME_CC_SHN_NONE = 0 << NVME_CC_SHN_SHIFT,
163 NVME_CC_SHN_NORMAL = 1 << NVME_CC_SHN_SHIFT,
164 NVME_CC_SHN_ABRUPT = 2 << NVME_CC_SHN_SHIFT,
165 NVME_CC_SHN_MASK = 3 << NVME_CC_SHN_SHIFT,
166 NVME_CC_IOSQES = NVME_NVM_IOSQES << NVME_CC_IOSQES_SHIFT,
167 NVME_CC_IOCQES = NVME_NVM_IOCQES << NVME_CC_IOCQES_SHIFT,
168 NVME_CSTS_RDY = 1 << 0,
169 NVME_CSTS_CFS = 1 << 1,
170 NVME_CSTS_NSSRO = 1 << 4,
171 NVME_CSTS_PP = 1 << 5,
172 NVME_CSTS_SHST_NORMAL = 0 << 2,
173 NVME_CSTS_SHST_OCCUR = 1 << 2,
174 NVME_CSTS_SHST_CMPLT = 2 << 2,
175 NVME_CSTS_SHST_MASK = 3 << 2,
176 };
177
178 struct nvme_id_power_state {
179 __le16 max_power; /* centiwatts */
180 __u8 rsvd2;
181 __u8 flags;
182 __le32 entry_lat; /* microseconds */
183 __le32 exit_lat; /* microseconds */
184 __u8 read_tput;
185 __u8 read_lat;
186 __u8 write_tput;
187 __u8 write_lat;
188 __le16 idle_power;
189 __u8 idle_scale;
190 __u8 rsvd19;
191 __le16 active_power;
192 __u8 active_work_scale;
193 __u8 rsvd23[9];
194 };
195
196 enum {
197 NVME_PS_FLAGS_MAX_POWER_SCALE = 1 << 0,
198 NVME_PS_FLAGS_NON_OP_STATE = 1 << 1,
199 };
200
201 struct nvme_id_ctrl {
202 __le16 vid;
203 __le16 ssvid;
204 char sn[20];
205 char mn[40];
206 char fr[8];
207 __u8 rab;
208 __u8 ieee[3];
209 __u8 cmic;
210 __u8 mdts;
211 __le16 cntlid;
212 __le32 ver;
213 __le32 rtd3r;
214 __le32 rtd3e;
215 __le32 oaes;
216 __le32 ctratt;
217 __u8 rsvd100[156];
218 __le16 oacs;
219 __u8 acl;
220 __u8 aerl;
221 __u8 frmw;
222 __u8 lpa;
223 __u8 elpe;
224 __u8 npss;
225 __u8 avscc;
226 __u8 apsta;
227 __le16 wctemp;
228 __le16 cctemp;
229 __le16 mtfa;
230 __le32 hmpre;
231 __le32 hmmin;
232 __u8 tnvmcap[16];
233 __u8 unvmcap[16];
234 __le32 rpmbs;
235 __le16 edstt;
236 __u8 dsto;
237 __u8 fwug;
238 __le16 kas;
239 __le16 hctma;
240 __le16 mntmt;
241 __le16 mxtmt;
242 __le32 sanicap;
243 __le32 hmminds;
244 __le16 hmmaxd;
245 __u8 rsvd338[4];
246 __u8 anatt;
247 __u8 anacap;
248 __le32 anagrpmax;
249 __le32 nanagrpid;
250 __u8 rsvd352[160];
251 __u8 sqes;
252 __u8 cqes;
253 __le16 maxcmd;
254 __le32 nn;
255 __le16 oncs;
256 __le16 fuses;
257 __u8 fna;
258 __u8 vwc;
259 __le16 awun;
260 __le16 awupf;
261 __u8 nvscc;
262 __u8 nwpc;
263 __le16 acwu;
264 __u8 rsvd534[2];
265 __le32 sgls;
266 __le32 mnan;
267 __u8 rsvd544[224];
268 char subnqn[256];
269 __u8 rsvd1024[768];
270 __le32 ioccsz;
271 __le32 iorcsz;
272 __le16 icdoff;
273 __u8 ctrattr;
274 __u8 msdbd;
275 __u8 rsvd1804[244];
276 struct nvme_id_power_state psd[32];
277 __u8 vs[1024];
278 };
279
280 enum {
281 NVME_CTRL_ONCS_COMPARE = 1 << 0,
282 NVME_CTRL_ONCS_WRITE_UNCORRECTABLE = 1 << 1,
283 NVME_CTRL_ONCS_DSM = 1 << 2,
284 NVME_CTRL_ONCS_WRITE_ZEROES = 1 << 3,
285 NVME_CTRL_ONCS_TIMESTAMP = 1 << 6,
286 NVME_CTRL_VWC_PRESENT = 1 << 0,
287 NVME_CTRL_OACS_SEC_SUPP = 1 << 0,
288 NVME_CTRL_OACS_DIRECTIVES = 1 << 5,
289 NVME_CTRL_OACS_DBBUF_SUPP = 1 << 8,
290 NVME_CTRL_LPA_CMD_EFFECTS_LOG = 1 << 1,
291 };
292
293 struct nvme_lbaf {
294 __le16 ms;
295 __u8 ds;
296 __u8 rp;
297 };
298
299 struct nvme_id_ns {
300 __le64 nsze;
301 __le64 ncap;
302 __le64 nuse;
303 __u8 nsfeat;
304 __u8 nlbaf;
305 __u8 flbas;
306 __u8 mc;
307 __u8 dpc;
308 __u8 dps;
309 __u8 nmic;
310 __u8 rescap;
311 __u8 fpi;
312 __u8 rsvd33;
313 __le16 nawun;
314 __le16 nawupf;
315 __le16 nacwu;
316 __le16 nabsn;
317 __le16 nabo;
318 __le16 nabspf;
319 __le16 noiob;
320 __u8 nvmcap[16];
321 __u8 rsvd64[28];
322 __le32 anagrpid;
323 __u8 rsvd96[3];
324 __u8 nsattr;
325 __u8 rsvd100[4];
326 __u8 nguid[16];
327 __u8 eui64[8];
328 struct nvme_lbaf lbaf[16];
329 __u8 rsvd192[192];
330 __u8 vs[3712];
331 };
332
333 enum {
334 NVME_ID_CNS_NS = 0x00,
335 NVME_ID_CNS_CTRL = 0x01,
336 NVME_ID_CNS_NS_ACTIVE_LIST = 0x02,
337 NVME_ID_CNS_NS_DESC_LIST = 0x03,
338 NVME_ID_CNS_NS_PRESENT_LIST = 0x10,
339 NVME_ID_CNS_NS_PRESENT = 0x11,
340 NVME_ID_CNS_CTRL_NS_LIST = 0x12,
341 NVME_ID_CNS_CTRL_LIST = 0x13,
342 };
343
344 enum {
345 NVME_DIR_IDENTIFY = 0x00,
346 NVME_DIR_STREAMS = 0x01,
347 NVME_DIR_SND_ID_OP_ENABLE = 0x01,
348 NVME_DIR_SND_ST_OP_REL_ID = 0x01,
349 NVME_DIR_SND_ST_OP_REL_RSC = 0x02,
350 NVME_DIR_RCV_ID_OP_PARAM = 0x01,
351 NVME_DIR_RCV_ST_OP_PARAM = 0x01,
352 NVME_DIR_RCV_ST_OP_STATUS = 0x02,
353 NVME_DIR_RCV_ST_OP_RESOURCE = 0x03,
354 NVME_DIR_ENDIR = 0x01,
355 };
356
357 enum {
358 NVME_NS_FEAT_THIN = 1 << 0,
359 NVME_NS_FLBAS_LBA_MASK = 0xf,
360 NVME_NS_FLBAS_META_EXT = 0x10,
361 NVME_LBAF_RP_BEST = 0,
362 NVME_LBAF_RP_BETTER = 1,
363 NVME_LBAF_RP_GOOD = 2,
364 NVME_LBAF_RP_DEGRADED = 3,
365 NVME_NS_DPC_PI_LAST = 1 << 4,
366 NVME_NS_DPC_PI_FIRST = 1 << 3,
367 NVME_NS_DPC_PI_TYPE3 = 1 << 2,
368 NVME_NS_DPC_PI_TYPE2 = 1 << 1,
369 NVME_NS_DPC_PI_TYPE1 = 1 << 0,
370 NVME_NS_DPS_PI_FIRST = 1 << 3,
371 NVME_NS_DPS_PI_MASK = 0x7,
372 NVME_NS_DPS_PI_TYPE1 = 1,
373 NVME_NS_DPS_PI_TYPE2 = 2,
374 NVME_NS_DPS_PI_TYPE3 = 3,
375 };
376
377 struct nvme_ns_id_desc {
378 __u8 nidt;
379 __u8 nidl;
380 __le16 reserved;
381 };
382
383 #define NVME_NIDT_EUI64_LEN 8
384 #define NVME_NIDT_NGUID_LEN 16
385 #define NVME_NIDT_UUID_LEN 16
386
387 enum {
388 NVME_NIDT_EUI64 = 0x01,
389 NVME_NIDT_NGUID = 0x02,
390 NVME_NIDT_UUID = 0x03,
391 };
392
393 struct nvme_smart_log {
394 __u8 critical_warning;
395 __u8 temperature[2];
396 __u8 avail_spare;
397 __u8 spare_thresh;
398 __u8 percent_used;
399 __u8 rsvd6[26];
400 __u8 data_units_read[16];
401 __u8 data_units_written[16];
402 __u8 host_reads[16];
403 __u8 host_writes[16];
404 __u8 ctrl_busy_time[16];
405 __u8 power_cycles[16];
406 __u8 power_on_hours[16];
407 __u8 unsafe_shutdowns[16];
408 __u8 media_errors[16];
409 __u8 num_err_log_entries[16];
410 __le32 warning_temp_time;
411 __le32 critical_comp_time;
412 __le16 temp_sensor[8];
413 __u8 rsvd216[296];
414 };
415
416 struct nvme_fw_slot_info_log {
417 __u8 afi;
418 __u8 rsvd1[7];
419 __le64 frs[7];
420 __u8 rsvd64[448];
421 };
422
423 enum {
424 NVME_CMD_EFFECTS_CSUPP = 1 << 0,
425 NVME_CMD_EFFECTS_LBCC = 1 << 1,
426 NVME_CMD_EFFECTS_NCC = 1 << 2,
427 NVME_CMD_EFFECTS_NIC = 1 << 3,
428 NVME_CMD_EFFECTS_CCC = 1 << 4,
429 NVME_CMD_EFFECTS_CSE_MASK = 3 << 16,
430 };
431
432 struct nvme_effects_log {
433 __le32 acs[256];
434 __le32 iocs[256];
435 __u8 resv[2048];
436 };
437
438 enum nvme_ana_state {
439 NVME_ANA_OPTIMIZED = 0x01,
440 NVME_ANA_NONOPTIMIZED = 0x02,
441 NVME_ANA_INACCESSIBLE = 0x03,
442 NVME_ANA_PERSISTENT_LOSS = 0x04,
443 NVME_ANA_CHANGE = 0x0f,
444 };
445
446 struct nvme_ana_group_desc {
447 __le32 grpid;
448 __le32 nnsids;
449 __le64 chgcnt;
450 __u8 state;
451 __u8 rsvd17[15];
452 __le32 nsids[];
453 };
454
455 /* flag for the log specific field of the ANA log */
456 #define NVME_ANA_LOG_RGO (1 << 0)
457
458 struct nvme_ana_rsp_hdr {
459 __le64 chgcnt;
460 __le16 ngrps;
461 __le16 rsvd10[3];
462 };
463
464 enum {
465 NVME_SMART_CRIT_SPARE = 1 << 0,
466 NVME_SMART_CRIT_TEMPERATURE = 1 << 1,
467 NVME_SMART_CRIT_RELIABILITY = 1 << 2,
468 NVME_SMART_CRIT_MEDIA = 1 << 3,
469 NVME_SMART_CRIT_VOLATILE_MEMORY = 1 << 4,
470 };
471
472 enum {
473 NVME_AER_ERROR = 0,
474 NVME_AER_SMART = 1,
475 NVME_AER_NOTICE = 2,
476 NVME_AER_CSS = 6,
477 NVME_AER_VS = 7,
478 };
479
480 enum {
481 NVME_AER_NOTICE_NS_CHANGED = 0x00,
482 NVME_AER_NOTICE_FW_ACT_STARTING = 0x01,
483 NVME_AER_NOTICE_ANA = 0x03,
484 };
485
486 enum {
487 NVME_AEN_CFG_NS_ATTR = 1 << 8,
488 NVME_AEN_CFG_FW_ACT = 1 << 9,
489 NVME_AEN_CFG_ANA_CHANGE = 1 << 11,
490 };
491
492 struct nvme_lba_range_type {
493 __u8 type;
494 __u8 attributes;
495 __u8 rsvd2[14];
496 __u64 slba;
497 __u64 nlb;
498 __u8 guid[16];
499 __u8 rsvd48[16];
500 };
501
502 enum {
503 NVME_LBART_TYPE_FS = 0x01,
504 NVME_LBART_TYPE_RAID = 0x02,
505 NVME_LBART_TYPE_CACHE = 0x03,
506 NVME_LBART_TYPE_SWAP = 0x04,
507
508 NVME_LBART_ATTRIB_TEMP = 1 << 0,
509 NVME_LBART_ATTRIB_HIDE = 1 << 1,
510 };
511
512 struct nvme_reservation_status {
513 __le32 gen;
514 __u8 rtype;
515 __u8 regctl[2];
516 __u8 resv5[2];
517 __u8 ptpls;
518 __u8 resv10[13];
519 struct {
520 __le16 cntlid;
521 __u8 rcsts;
522 __u8 resv3[5];
523 __le64 hostid;
524 __le64 rkey;
525 } regctl_ds[];
526 };
527
528 enum nvme_async_event_type {
529 NVME_AER_TYPE_ERROR = 0,
530 NVME_AER_TYPE_SMART = 1,
531 NVME_AER_TYPE_NOTICE = 2,
532 };
533
534 /* I/O commands */
535
536 enum nvme_opcode {
537 nvme_cmd_flush = 0x00,
538 nvme_cmd_write = 0x01,
539 nvme_cmd_read = 0x02,
540 nvme_cmd_write_uncor = 0x04,
541 nvme_cmd_compare = 0x05,
542 nvme_cmd_write_zeroes = 0x08,
543 nvme_cmd_dsm = 0x09,
544 nvme_cmd_resv_register = 0x0d,
545 nvme_cmd_resv_report = 0x0e,
546 nvme_cmd_resv_acquire = 0x11,
547 nvme_cmd_resv_release = 0x15,
548 };
549
550 /*
551 * Descriptor subtype - lower 4 bits of nvme_(keyed_)sgl_desc identifier
552 *
553 * @NVME_SGL_FMT_ADDRESS: absolute address of the data block
554 * @NVME_SGL_FMT_OFFSET: relative offset of the in-capsule data block
555 * @NVME_SGL_FMT_TRANSPORT_A: transport defined format, value 0xA
556 * @NVME_SGL_FMT_INVALIDATE: RDMA transport specific remote invalidation
557 * request subtype
558 */
559 enum {
560 NVME_SGL_FMT_ADDRESS = 0x00,
561 NVME_SGL_FMT_OFFSET = 0x01,
562 NVME_SGL_FMT_TRANSPORT_A = 0x0A,
563 NVME_SGL_FMT_INVALIDATE = 0x0f,
564 };
565
566 /*
567 * Descriptor type - upper 4 bits of nvme_(keyed_)sgl_desc identifier
568 *
569 * For struct nvme_sgl_desc:
570 * @NVME_SGL_FMT_DATA_DESC: data block descriptor
571 * @NVME_SGL_FMT_SEG_DESC: sgl segment descriptor
572 * @NVME_SGL_FMT_LAST_SEG_DESC: last sgl segment descriptor
573 *
574 * For struct nvme_keyed_sgl_desc:
575 * @NVME_KEY_SGL_FMT_DATA_DESC: keyed data block descriptor
576 *
577 * Transport-specific SGL types:
578 * @NVME_TRANSPORT_SGL_DATA_DESC: Transport SGL data dlock descriptor
579 */
580 enum {
581 NVME_SGL_FMT_DATA_DESC = 0x00,
582 NVME_SGL_FMT_SEG_DESC = 0x02,
583 NVME_SGL_FMT_LAST_SEG_DESC = 0x03,
584 NVME_KEY_SGL_FMT_DATA_DESC = 0x04,
585 NVME_TRANSPORT_SGL_DATA_DESC = 0x05,
586 };
587
588 struct nvme_sgl_desc {
589 __le64 addr;
590 __le32 length;
591 __u8 rsvd[3];
592 __u8 type;
593 };
594
595 struct nvme_keyed_sgl_desc {
596 __le64 addr;
597 __u8 length[3];
598 __u8 key[4];
599 __u8 type;
600 };
601
602 union nvme_data_ptr {
603 struct {
604 __le64 prp1;
605 __le64 prp2;
606 };
607 struct nvme_sgl_desc sgl;
608 struct nvme_keyed_sgl_desc ksgl;
609 };
610
611 /*
612 * Lowest two bits of our flags field (FUSE field in the spec):
613 *
614 * @NVME_CMD_FUSE_FIRST: Fused Operation, first command
615 * @NVME_CMD_FUSE_SECOND: Fused Operation, second command
616 *
617 * Highest two bits in our flags field (PSDT field in the spec):
618 *
619 * @NVME_CMD_PSDT_SGL_METABUF: Use SGLS for this transfer,
620 * If used, MPTR contains addr of single physical buffer (byte aligned).
621 * @NVME_CMD_PSDT_SGL_METASEG: Use SGLS for this transfer,
622 * If used, MPTR contains an address of an SGL segment containing
623 * exactly 1 SGL descriptor (qword aligned).
624 */
625 enum {
626 NVME_CMD_FUSE_FIRST = (1 << 0),
627 NVME_CMD_FUSE_SECOND = (1 << 1),
628
629 NVME_CMD_SGL_METABUF = (1 << 6),
630 NVME_CMD_SGL_METASEG = (1 << 7),
631 NVME_CMD_SGL_ALL = NVME_CMD_SGL_METABUF | NVME_CMD_SGL_METASEG,
632 };
633
634 struct nvme_common_command {
635 __u8 opcode;
636 __u8 flags;
637 __u16 command_id;
638 __le32 nsid;
639 __le32 cdw2[2];
640 __le64 metadata;
641 union nvme_data_ptr dptr;
642 __le32 cdw10[6];
643 };
644
645 struct nvme_rw_command {
646 __u8 opcode;
647 __u8 flags;
648 __u16 command_id;
649 __le32 nsid;
650 __u64 rsvd2;
651 __le64 metadata;
652 union nvme_data_ptr dptr;
653 __le64 slba;
654 __le16 length;
655 __le16 control;
656 __le32 dsmgmt;
657 __le32 reftag;
658 __le16 apptag;
659 __le16 appmask;
660 };
661
662 enum {
663 NVME_RW_LR = 1 << 15,
664 NVME_RW_FUA = 1 << 14,
665 NVME_RW_DSM_FREQ_UNSPEC = 0,
666 NVME_RW_DSM_FREQ_TYPICAL = 1,
667 NVME_RW_DSM_FREQ_RARE = 2,
668 NVME_RW_DSM_FREQ_READS = 3,
669 NVME_RW_DSM_FREQ_WRITES = 4,
670 NVME_RW_DSM_FREQ_RW = 5,
671 NVME_RW_DSM_FREQ_ONCE = 6,
672 NVME_RW_DSM_FREQ_PREFETCH = 7,
673 NVME_RW_DSM_FREQ_TEMP = 8,
674 NVME_RW_DSM_LATENCY_NONE = 0 << 4,
675 NVME_RW_DSM_LATENCY_IDLE = 1 << 4,
676 NVME_RW_DSM_LATENCY_NORM = 2 << 4,
677 NVME_RW_DSM_LATENCY_LOW = 3 << 4,
678 NVME_RW_DSM_SEQ_REQ = 1 << 6,
679 NVME_RW_DSM_COMPRESSED = 1 << 7,
680 NVME_RW_PRINFO_PRCHK_REF = 1 << 10,
681 NVME_RW_PRINFO_PRCHK_APP = 1 << 11,
682 NVME_RW_PRINFO_PRCHK_GUARD = 1 << 12,
683 NVME_RW_PRINFO_PRACT = 1 << 13,
684 NVME_RW_DTYPE_STREAMS = 1 << 4,
685 };
686
687 struct nvme_dsm_cmd {
688 __u8 opcode;
689 __u8 flags;
690 __u16 command_id;
691 __le32 nsid;
692 __u64 rsvd2[2];
693 union nvme_data_ptr dptr;
694 __le32 nr;
695 __le32 attributes;
696 __u32 rsvd12[4];
697 };
698
699 enum {
700 NVME_DSMGMT_IDR = 1 << 0,
701 NVME_DSMGMT_IDW = 1 << 1,
702 NVME_DSMGMT_AD = 1 << 2,
703 };
704
705 #define NVME_DSM_MAX_RANGES 256
706
707 struct nvme_dsm_range {
708 __le32 cattr;
709 __le32 nlb;
710 __le64 slba;
711 };
712
713 struct nvme_write_zeroes_cmd {
714 __u8 opcode;
715 __u8 flags;
716 __u16 command_id;
717 __le32 nsid;
718 __u64 rsvd2;
719 __le64 metadata;
720 union nvme_data_ptr dptr;
721 __le64 slba;
722 __le16 length;
723 __le16 control;
724 __le32 dsmgmt;
725 __le32 reftag;
726 __le16 apptag;
727 __le16 appmask;
728 };
729
730 /* Features */
731
732 struct nvme_feat_auto_pst {
733 __le64 entries[32];
734 };
735
736 enum {
737 NVME_HOST_MEM_ENABLE = (1 << 0),
738 NVME_HOST_MEM_RETURN = (1 << 1),
739 };
740
741 /* Admin commands */
742
743 enum nvme_admin_opcode {
744 nvme_admin_delete_sq = 0x00,
745 nvme_admin_create_sq = 0x01,
746 nvme_admin_get_log_page = 0x02,
747 nvme_admin_delete_cq = 0x04,
748 nvme_admin_create_cq = 0x05,
749 nvme_admin_identify = 0x06,
750 nvme_admin_abort_cmd = 0x08,
751 nvme_admin_set_features = 0x09,
752 nvme_admin_get_features = 0x0a,
753 nvme_admin_async_event = 0x0c,
754 nvme_admin_ns_mgmt = 0x0d,
755 nvme_admin_activate_fw = 0x10,
756 nvme_admin_download_fw = 0x11,
757 nvme_admin_ns_attach = 0x15,
758 nvme_admin_keep_alive = 0x18,
759 nvme_admin_directive_send = 0x19,
760 nvme_admin_directive_recv = 0x1a,
761 nvme_admin_dbbuf = 0x7C,
762 nvme_admin_format_nvm = 0x80,
763 nvme_admin_security_send = 0x81,
764 nvme_admin_security_recv = 0x82,
765 nvme_admin_sanitize_nvm = 0x84,
766 };
767
768 enum {
769 NVME_QUEUE_PHYS_CONTIG = (1 << 0),
770 NVME_CQ_IRQ_ENABLED = (1 << 1),
771 NVME_SQ_PRIO_URGENT = (0 << 1),
772 NVME_SQ_PRIO_HIGH = (1 << 1),
773 NVME_SQ_PRIO_MEDIUM = (2 << 1),
774 NVME_SQ_PRIO_LOW = (3 << 1),
775 NVME_FEAT_ARBITRATION = 0x01,
776 NVME_FEAT_POWER_MGMT = 0x02,
777 NVME_FEAT_LBA_RANGE = 0x03,
778 NVME_FEAT_TEMP_THRESH = 0x04,
779 NVME_FEAT_ERR_RECOVERY = 0x05,
780 NVME_FEAT_VOLATILE_WC = 0x06,
781 NVME_FEAT_NUM_QUEUES = 0x07,
782 NVME_FEAT_IRQ_COALESCE = 0x08,
783 NVME_FEAT_IRQ_CONFIG = 0x09,
784 NVME_FEAT_WRITE_ATOMIC = 0x0a,
785 NVME_FEAT_ASYNC_EVENT = 0x0b,
786 NVME_FEAT_AUTO_PST = 0x0c,
787 NVME_FEAT_HOST_MEM_BUF = 0x0d,
788 NVME_FEAT_TIMESTAMP = 0x0e,
789 NVME_FEAT_KATO = 0x0f,
790 NVME_FEAT_HCTM = 0x10,
791 NVME_FEAT_NOPSC = 0x11,
792 NVME_FEAT_RRL = 0x12,
793 NVME_FEAT_PLM_CONFIG = 0x13,
794 NVME_FEAT_PLM_WINDOW = 0x14,
795 NVME_FEAT_SW_PROGRESS = 0x80,
796 NVME_FEAT_HOST_ID = 0x81,
797 NVME_FEAT_RESV_MASK = 0x82,
798 NVME_FEAT_RESV_PERSIST = 0x83,
799 NVME_FEAT_WRITE_PROTECT = 0x84,
800 NVME_LOG_ERROR = 0x01,
801 NVME_LOG_SMART = 0x02,
802 NVME_LOG_FW_SLOT = 0x03,
803 NVME_LOG_CHANGED_NS = 0x04,
804 NVME_LOG_CMD_EFFECTS = 0x05,
805 NVME_LOG_ANA = 0x0c,
806 NVME_LOG_DISC = 0x70,
807 NVME_LOG_RESERVATION = 0x80,
808 NVME_FWACT_REPL = (0 << 3),
809 NVME_FWACT_REPL_ACTV = (1 << 3),
810 NVME_FWACT_ACTV = (2 << 3),
811 };
812
813 /* NVMe Namespace Write Protect State */
814 enum {
815 NVME_NS_NO_WRITE_PROTECT = 0,
816 NVME_NS_WRITE_PROTECT,
817 NVME_NS_WRITE_PROTECT_POWER_CYCLE,
818 NVME_NS_WRITE_PROTECT_PERMANENT,
819 };
820
821 #define NVME_MAX_CHANGED_NAMESPACES 1024
822
823 struct nvme_identify {
824 __u8 opcode;
825 __u8 flags;
826 __u16 command_id;
827 __le32 nsid;
828 __u64 rsvd2[2];
829 union nvme_data_ptr dptr;
830 __u8 cns;
831 __u8 rsvd3;
832 __le16 ctrlid;
833 __u32 rsvd11[5];
834 };
835
836 #define NVME_IDENTIFY_DATA_SIZE 4096
837
838 struct nvme_features {
839 __u8 opcode;
840 __u8 flags;
841 __u16 command_id;
842 __le32 nsid;
843 __u64 rsvd2[2];
844 union nvme_data_ptr dptr;
845 __le32 fid;
846 __le32 dword11;
847 __le32 dword12;
848 __le32 dword13;
849 __le32 dword14;
850 __le32 dword15;
851 };
852
853 struct nvme_host_mem_buf_desc {
854 __le64 addr;
855 __le32 size;
856 __u32 rsvd;
857 };
858
859 struct nvme_create_cq {
860 __u8 opcode;
861 __u8 flags;
862 __u16 command_id;
863 __u32 rsvd1[5];
864 __le64 prp1;
865 __u64 rsvd8;
866 __le16 cqid;
867 __le16 qsize;
868 __le16 cq_flags;
869 __le16 irq_vector;
870 __u32 rsvd12[4];
871 };
872
873 struct nvme_create_sq {
874 __u8 opcode;
875 __u8 flags;
876 __u16 command_id;
877 __u32 rsvd1[5];
878 __le64 prp1;
879 __u64 rsvd8;
880 __le16 sqid;
881 __le16 qsize;
882 __le16 sq_flags;
883 __le16 cqid;
884 __u32 rsvd12[4];
885 };
886
887 struct nvme_delete_queue {
888 __u8 opcode;
889 __u8 flags;
890 __u16 command_id;
891 __u32 rsvd1[9];
892 __le16 qid;
893 __u16 rsvd10;
894 __u32 rsvd11[5];
895 };
896
897 struct nvme_abort_cmd {
898 __u8 opcode;
899 __u8 flags;
900 __u16 command_id;
901 __u32 rsvd1[9];
902 __le16 sqid;
903 __u16 cid;
904 __u32 rsvd11[5];
905 };
906
907 struct nvme_download_firmware {
908 __u8 opcode;
909 __u8 flags;
910 __u16 command_id;
911 __u32 rsvd1[5];
912 union nvme_data_ptr dptr;
913 __le32 numd;
914 __le32 offset;
915 __u32 rsvd12[4];
916 };
917
918 struct nvme_format_cmd {
919 __u8 opcode;
920 __u8 flags;
921 __u16 command_id;
922 __le32 nsid;
923 __u64 rsvd2[4];
924 __le32 cdw10;
925 __u32 rsvd11[5];
926 };
927
928 struct nvme_get_log_page_command {
929 __u8 opcode;
930 __u8 flags;
931 __u16 command_id;
932 __le32 nsid;
933 __u64 rsvd2[2];
934 union nvme_data_ptr dptr;
935 __u8 lid;
936 __u8 lsp; /* upper 4 bits reserved */
937 __le16 numdl;
938 __le16 numdu;
939 __u16 rsvd11;
940 __le32 lpol;
941 __le32 lpou;
942 __u32 rsvd14[2];
943 };
944
945 struct nvme_directive_cmd {
946 __u8 opcode;
947 __u8 flags;
948 __u16 command_id;
949 __le32 nsid;
950 __u64 rsvd2[2];
951 union nvme_data_ptr dptr;
952 __le32 numd;
953 __u8 doper;
954 __u8 dtype;
955 __le16 dspec;
956 __u8 endir;
957 __u8 tdtype;
958 __u16 rsvd15;
959
960 __u32 rsvd16[3];
961 };
962
963 /*
964 * Fabrics subcommands.
965 */
966 enum nvmf_fabrics_opcode {
967 nvme_fabrics_command = 0x7f,
968 };
969
970 enum nvmf_capsule_command {
971 nvme_fabrics_type_property_set = 0x00,
972 nvme_fabrics_type_connect = 0x01,
973 nvme_fabrics_type_property_get = 0x04,
974 };
975
976 struct nvmf_common_command {
977 __u8 opcode;
978 __u8 resv1;
979 __u16 command_id;
980 __u8 fctype;
981 __u8 resv2[35];
982 __u8 ts[24];
983 };
984
985 /*
986 * The legal cntlid range a NVMe Target will provide.
987 * Note that cntlid of value 0 is considered illegal in the fabrics world.
988 * Devices based on earlier specs did not have the subsystem concept;
989 * therefore, those devices had their cntlid value set to 0 as a result.
990 */
991 #define NVME_CNTLID_MIN 1
992 #define NVME_CNTLID_MAX 0xffef
993 #define NVME_CNTLID_DYNAMIC 0xffff
994
995 #define MAX_DISC_LOGS 255
996
997 /* Discovery log page entry */
998 struct nvmf_disc_rsp_page_entry {
999 __u8 trtype;
1000 __u8 adrfam;
1001 __u8 subtype;
1002 __u8 treq;
1003 __le16 portid;
1004 __le16 cntlid;
1005 __le16 asqsz;
1006 __u8 resv8[22];
1007 char trsvcid[NVMF_TRSVCID_SIZE];
1008 __u8 resv64[192];
1009 char subnqn[NVMF_NQN_FIELD_LEN];
1010 char traddr[NVMF_TRADDR_SIZE];
1011 union tsas {
1012 char common[NVMF_TSAS_SIZE];
1013 struct rdma {
1014 __u8 qptype;
1015 __u8 prtype;
1016 __u8 cms;
1017 __u8 resv3[5];
1018 __u16 pkey;
1019 __u8 resv10[246];
1020 } rdma;
1021 } tsas;
1022 };
1023
1024 /* Discovery log page header */
1025 struct nvmf_disc_rsp_page_hdr {
1026 __le64 genctr;
1027 __le64 numrec;
1028 __le16 recfmt;
1029 __u8 resv14[1006];
1030 struct nvmf_disc_rsp_page_entry entries[0];
1031 };
1032
1033 struct nvmf_connect_command {
1034 __u8 opcode;
1035 __u8 resv1;
1036 __u16 command_id;
1037 __u8 fctype;
1038 __u8 resv2[19];
1039 union nvme_data_ptr dptr;
1040 __le16 recfmt;
1041 __le16 qid;
1042 __le16 sqsize;
1043 __u8 cattr;
1044 __u8 resv3;
1045 __le32 kato;
1046 __u8 resv4[12];
1047 };
1048
1049 struct nvmf_connect_data {
1050 uuid_t hostid;
1051 __le16 cntlid;
1052 char resv4[238];
1053 char subsysnqn[NVMF_NQN_FIELD_LEN];
1054 char hostnqn[NVMF_NQN_FIELD_LEN];
1055 char resv5[256];
1056 };
1057
1058 struct nvmf_property_set_command {
1059 __u8 opcode;
1060 __u8 resv1;
1061 __u16 command_id;
1062 __u8 fctype;
1063 __u8 resv2[35];
1064 __u8 attrib;
1065 __u8 resv3[3];
1066 __le32 offset;
1067 __le64 value;
1068 __u8 resv4[8];
1069 };
1070
1071 struct nvmf_property_get_command {
1072 __u8 opcode;
1073 __u8 resv1;
1074 __u16 command_id;
1075 __u8 fctype;
1076 __u8 resv2[35];
1077 __u8 attrib;
1078 __u8 resv3[3];
1079 __le32 offset;
1080 __u8 resv4[16];
1081 };
1082
1083 struct nvme_dbbuf {
1084 __u8 opcode;
1085 __u8 flags;
1086 __u16 command_id;
1087 __u32 rsvd1[5];
1088 __le64 prp1;
1089 __le64 prp2;
1090 __u32 rsvd12[6];
1091 };
1092
1093 struct streams_directive_params {
1094 __le16 msl;
1095 __le16 nssa;
1096 __le16 nsso;
1097 __u8 rsvd[10];
1098 __le32 sws;
1099 __le16 sgs;
1100 __le16 nsa;
1101 __le16 nso;
1102 __u8 rsvd2[6];
1103 };
1104
1105 struct nvme_command {
1106 union {
1107 struct nvme_common_command common;
1108 struct nvme_rw_command rw;
1109 struct nvme_identify identify;
1110 struct nvme_features features;
1111 struct nvme_create_cq create_cq;
1112 struct nvme_create_sq create_sq;
1113 struct nvme_delete_queue delete_queue;
1114 struct nvme_download_firmware dlfw;
1115 struct nvme_format_cmd format;
1116 struct nvme_dsm_cmd dsm;
1117 struct nvme_write_zeroes_cmd write_zeroes;
1118 struct nvme_abort_cmd abort;
1119 struct nvme_get_log_page_command get_log_page;
1120 struct nvmf_common_command fabrics;
1121 struct nvmf_connect_command connect;
1122 struct nvmf_property_set_command prop_set;
1123 struct nvmf_property_get_command prop_get;
1124 struct nvme_dbbuf dbbuf;
1125 struct nvme_directive_cmd directive;
1126 };
1127 };
1128
nvme_is_write(struct nvme_command * cmd)1129 static inline bool nvme_is_write(struct nvme_command *cmd)
1130 {
1131 /*
1132 * What a mess...
1133 *
1134 * Why can't we simply have a Fabrics In and Fabrics out command?
1135 */
1136 if (unlikely(cmd->common.opcode == nvme_fabrics_command))
1137 return cmd->fabrics.fctype & 1;
1138 return cmd->common.opcode & 1;
1139 }
1140
1141 enum {
1142 /*
1143 * Generic Command Status:
1144 */
1145 NVME_SC_SUCCESS = 0x0,
1146 NVME_SC_INVALID_OPCODE = 0x1,
1147 NVME_SC_INVALID_FIELD = 0x2,
1148 NVME_SC_CMDID_CONFLICT = 0x3,
1149 NVME_SC_DATA_XFER_ERROR = 0x4,
1150 NVME_SC_POWER_LOSS = 0x5,
1151 NVME_SC_INTERNAL = 0x6,
1152 NVME_SC_ABORT_REQ = 0x7,
1153 NVME_SC_ABORT_QUEUE = 0x8,
1154 NVME_SC_FUSED_FAIL = 0x9,
1155 NVME_SC_FUSED_MISSING = 0xa,
1156 NVME_SC_INVALID_NS = 0xb,
1157 NVME_SC_CMD_SEQ_ERROR = 0xc,
1158 NVME_SC_SGL_INVALID_LAST = 0xd,
1159 NVME_SC_SGL_INVALID_COUNT = 0xe,
1160 NVME_SC_SGL_INVALID_DATA = 0xf,
1161 NVME_SC_SGL_INVALID_METADATA = 0x10,
1162 NVME_SC_SGL_INVALID_TYPE = 0x11,
1163
1164 NVME_SC_SGL_INVALID_OFFSET = 0x16,
1165 NVME_SC_SGL_INVALID_SUBTYPE = 0x17,
1166
1167 NVME_SC_NS_WRITE_PROTECTED = 0x20,
1168
1169 NVME_SC_LBA_RANGE = 0x80,
1170 NVME_SC_CAP_EXCEEDED = 0x81,
1171 NVME_SC_NS_NOT_READY = 0x82,
1172 NVME_SC_RESERVATION_CONFLICT = 0x83,
1173
1174 /*
1175 * Command Specific Status:
1176 */
1177 NVME_SC_CQ_INVALID = 0x100,
1178 NVME_SC_QID_INVALID = 0x101,
1179 NVME_SC_QUEUE_SIZE = 0x102,
1180 NVME_SC_ABORT_LIMIT = 0x103,
1181 NVME_SC_ABORT_MISSING = 0x104,
1182 NVME_SC_ASYNC_LIMIT = 0x105,
1183 NVME_SC_FIRMWARE_SLOT = 0x106,
1184 NVME_SC_FIRMWARE_IMAGE = 0x107,
1185 NVME_SC_INVALID_VECTOR = 0x108,
1186 NVME_SC_INVALID_LOG_PAGE = 0x109,
1187 NVME_SC_INVALID_FORMAT = 0x10a,
1188 NVME_SC_FW_NEEDS_CONV_RESET = 0x10b,
1189 NVME_SC_INVALID_QUEUE = 0x10c,
1190 NVME_SC_FEATURE_NOT_SAVEABLE = 0x10d,
1191 NVME_SC_FEATURE_NOT_CHANGEABLE = 0x10e,
1192 NVME_SC_FEATURE_NOT_PER_NS = 0x10f,
1193 NVME_SC_FW_NEEDS_SUBSYS_RESET = 0x110,
1194 NVME_SC_FW_NEEDS_RESET = 0x111,
1195 NVME_SC_FW_NEEDS_MAX_TIME = 0x112,
1196 NVME_SC_FW_ACIVATE_PROHIBITED = 0x113,
1197 NVME_SC_OVERLAPPING_RANGE = 0x114,
1198 NVME_SC_NS_INSUFFICENT_CAP = 0x115,
1199 NVME_SC_NS_ID_UNAVAILABLE = 0x116,
1200 NVME_SC_NS_ALREADY_ATTACHED = 0x118,
1201 NVME_SC_NS_IS_PRIVATE = 0x119,
1202 NVME_SC_NS_NOT_ATTACHED = 0x11a,
1203 NVME_SC_THIN_PROV_NOT_SUPP = 0x11b,
1204 NVME_SC_CTRL_LIST_INVALID = 0x11c,
1205
1206 /*
1207 * I/O Command Set Specific - NVM commands:
1208 */
1209 NVME_SC_BAD_ATTRIBUTES = 0x180,
1210 NVME_SC_INVALID_PI = 0x181,
1211 NVME_SC_READ_ONLY = 0x182,
1212 NVME_SC_ONCS_NOT_SUPPORTED = 0x183,
1213
1214 /*
1215 * I/O Command Set Specific - Fabrics commands:
1216 */
1217 NVME_SC_CONNECT_FORMAT = 0x180,
1218 NVME_SC_CONNECT_CTRL_BUSY = 0x181,
1219 NVME_SC_CONNECT_INVALID_PARAM = 0x182,
1220 NVME_SC_CONNECT_RESTART_DISC = 0x183,
1221 NVME_SC_CONNECT_INVALID_HOST = 0x184,
1222
1223 NVME_SC_DISCOVERY_RESTART = 0x190,
1224 NVME_SC_AUTH_REQUIRED = 0x191,
1225
1226 /*
1227 * Media and Data Integrity Errors:
1228 */
1229 NVME_SC_WRITE_FAULT = 0x280,
1230 NVME_SC_READ_ERROR = 0x281,
1231 NVME_SC_GUARD_CHECK = 0x282,
1232 NVME_SC_APPTAG_CHECK = 0x283,
1233 NVME_SC_REFTAG_CHECK = 0x284,
1234 NVME_SC_COMPARE_FAILED = 0x285,
1235 NVME_SC_ACCESS_DENIED = 0x286,
1236 NVME_SC_UNWRITTEN_BLOCK = 0x287,
1237
1238 /*
1239 * Path-related Errors:
1240 */
1241 NVME_SC_ANA_PERSISTENT_LOSS = 0x301,
1242 NVME_SC_ANA_INACCESSIBLE = 0x302,
1243 NVME_SC_ANA_TRANSITION = 0x303,
1244
1245 NVME_SC_DNR = 0x4000,
1246 };
1247
1248 struct nvme_completion {
1249 /*
1250 * Used by Admin and Fabrics commands to return data:
1251 */
1252 union nvme_result {
1253 __le16 u16;
1254 __le32 u32;
1255 __le64 u64;
1256 } result;
1257 __le16 sq_head; /* how much of this queue may be reclaimed */
1258 __le16 sq_id; /* submission queue that generated this entry */
1259 __u16 command_id; /* of the command which completed */
1260 __le16 status; /* did the command fail, and if so, why? */
1261 };
1262
1263 #define NVME_VS(major, minor, tertiary) \
1264 (((major) << 16) | ((minor) << 8) | (tertiary))
1265
1266 #define NVME_MAJOR(ver) ((ver) >> 16)
1267 #define NVME_MINOR(ver) (((ver) >> 8) & 0xff)
1268 #define NVME_TERTIARY(ver) ((ver) & 0xff)
1269
1270 #endif /* _LINUX_NVME_H */
1271
