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Diffstat (limited to 'Documentation/nvme-get-feature.1')
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diff --git a/Documentation/nvme-get-feature.1 b/Documentation/nvme-get-feature.1 new file mode 100644 index 0000000..822dd23 --- /dev/null +++ b/Documentation/nvme-get-feature.1 @@ -0,0 +1,232 @@ +'\" 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: 01/30/2023 +.\" Manual: NVMe Manual +.\" Source: NVMe +.\" Language: English +.\" +.TH "NVME\-GET\-FEATURE" "1" "01/30/2023" "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 |