1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
'\" t
.\" Title: nvme-get-feature
.\" Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 08/01/2022
.\" Manual: NVMe Manual
.\" Source: NVMe
.\" Language: English
.\"
.TH "NVME\-GET\-FEATURE" "1" "08/01/2022" "NVMe" "NVMe Manual"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
nvme-get-feature \- Gets an NVMe feature, returns applicable results
.SH "SYNOPSIS"
.sp
.nf
\fInvme get\-feature\fR <device> [\-\-namespace\-id=<nsid> | \-n <nsid>]
[\-\-feature\-id=<fid> | \-f <fid>] [\-\-cdw11=<cdw11>]
[\-\-uuid\-index=<uuid\-index> | \-U <uuid_index>]
[\-\-data\-len=<data\-len> | \-l <data\-len>]
[\-\-sel=<select> | \-s <select>]
[\-\-raw\-binary | \-b]
[\-\-human\-readable | \-H]
.fi
.SH "DESCRIPTION"
.sp
Submits an NVMe Get Feature admin command and returns the applicable results\&. This may be the feature\(cqs value, or may also include a feature structure if the feature requires it (ex: LBA Range Type)\&.
.sp
The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1)\&.
.sp
On success, the returned feature\(cqs structure (if applicable) may be returned in one of several ways depending on the option flags; the structure may parsed by the program and printed in a readable format if it is a known structure, displayed in hex, or the raw buffer may be printed to stdout for another program to parse\&.
.SH "OPTIONS"
.PP
\-n <nsid>, \-\-namespace\-id=<nsid>
.RS 4
Retrieve the feature for the given nsid\&. This is optional and most features do not use this value\&.
.RE
.PP
\-f <fid>, \-\-feature\-id=<fid>
.RS 4
The feature id to send with the command\&. Value provided should be in hex\&.
.RE
.PP
\-s <select>, \-\-sel=<select>
.RS 4
Select (SEL): This field specifies which value of the attributes to return in the provided data:
.TS
allbox tab(:);
lt lt
lt lt
lt lt
lt lt
lt lt
lt lt.
T{
Select
T}:T{
Description
T}
T{
0
T}:T{
Current
T}
T{
1
T}:T{
Default
T}
T{
2
T}:T{
Saved
T}
T{
3
T}:T{
Supported capabilities
T}
T{
4\(en7
T}:T{
Reserved
T}
.TE
.sp 1
.RE
.PP
\-U <uuid\-index>, \-\-uuid\-index=<uuid\-index>
.RS 4
UUID Index of the feature
.RE
.PP
\-l <data\-len>, \-\-data\-len=<data\-len>
.RS 4
The data length for the buffer returned for this feature\&. Most known features do not use this value\&. The exception is LBA Range Type
.RE
.PP
\-\-cdw11=<cdw11>
.RS 4
The value for command dword 11, if applicable\&.
.RE
.PP
\-b, \-\-raw\-binary
.RS 4
Print the raw feature buffer to stdout if the feature returns a structure\&.
.RE
.PP
\-H, \-\-human\-readable
.RS 4
This option will parse and format many of the bit fields into human\-readable formats\&.
.RE
.SH "EXAMPLES"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Retrieves the feature for Number of Queues, or feature id 7:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme get\-feature /dev/nvme0 \-f 7
.fi
.if n \{\
.RE
.\}
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
The following retrieves the feature for the LBA Range Type, which implicitly requires a buffer and will be printed to the screen in human readable format:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme get\-feature /dev/nvme0 \-f 3
.fi
.if n \{\
.RE
.\}
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Retrieves the feature for the some vendor specific feature and specifically requesting a buffer be allocate for this feature, which will be displayed to the user in as a hex dump:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme get\-feature /dev/nvme0 \-f 0xc0 \-l 512
.fi
.if n \{\
.RE
.\}
.sp
Get feature with UUID index
.RE
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme get\-feature /dev/nvme0 \-f 0xc0 \-l 512 \-U 0x1
.fi
.if n \{\
.RE
.\}
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
The following retrieves the feature for the LBA Range Type, which implicitly requires a buffer and will be saved to a file in its raw format:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme get\-feature /dev/nvme0 \-f 3 \-\-raw\-binary > lba_range\&.raw
.fi
.if n \{\
.RE
.\}
.sp
It is probably a bad idea to not redirect stdout when using this mode\&.
.RE
.SH "NVME"
.sp
Part of the nvme\-user suite
|
