nvme-cli/Documentation/nvme-admin-passthru.1

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.\"     Title: nvme-admin-passthru
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 06/30/2023
.\"    Manual: NVMe Manual
.\"    Source: NVMe
.\"  Language: English
.\"
.TH "NVME\-ADMIN\-PASSTHR" "1" "06/30/2023" "NVMe" "NVMe Manual"
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.SH "NAME"
nvme-admin-passthru \- Submit an arbitrary admin command, return results
.SH "SYNOPSIS"
.sp
.nf
\fInvme\-admin\-passthru\fR <device> [\-\-opcode=<opcode> | \-o <opcode>]
                [\-\-flags=<flags> | \-f <flags>] [\-rsvd=<rsvd> | \-R <rsvd>]
                [\-\-namespace\-id=<nsid> | \-n <nsid>] [\-\-cdw2=<cdw2> | \-2 <cdw2>]
                [\-\-cdw3=<cdw3> | \-3 <cdw3>] [\-\-cdw10=<cdw10> | \-4 <cdw4>]
                [\-\-cdw11=<cdw11> | \-5 <cdw5>] [\-\-cdw12=<cdw12> | \-6 <cdw6>]
                [\-\-cdw13=<cdw13> | \-7 <cdw7>] [\-\-cdw14=<cdw14> | \-8 <cdw8>]
                [\-\-cdw15=<cdw15> | \-9 <cdw9>]
                [\-\-data\-len=<data\-len> | \-l <data\-len>]
                [\-\-metadata\-len=<len> | \-m <len>]
                [\-\-input\-file=<file> | \-i <file>]
                [\-\-read | \-r ] [\-\-write | \-w]
                [\-\-timeout=<to> | \-t <to>]
                [\-\-show\-command | \-s]
                [\-\-dry\-run | \-d]
                [\-\-raw\-binary | \-b]
                [\-\-prefill=<prefill> | \-p <prefill>]
                [\-\-latency | \-T]
.fi
.SH "DESCRIPTION"
.sp
Submits an arbitrary NVMe admin command and returns the applicable results\&. This may be the simply the commands result and status, or may also include a buffer if the command returns one\&. This command does no interpretation of the opcodes or options\&.
.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 structure (if applicable) may be returned in one of several ways depending on the option flags; the structure may printed by the program as a hex dump, or may be returned as a raw buffer printed to stdout for another program to parse\&.
.SH "OPTIONS"
.PP
\-o <opcode>, \-\-opcode=<opcode>
.RS 4
The NVMe opcode to send to the device in the command
.RE
.PP
\-f <flags>, \-\-flags=<flags>
.RS 4
The NVMe command flags to send to the device in the command
.RE
.PP
\-R <rsvd>, \-\-rsvd=<rsvd>
.RS 4
The value for the reserved field in the command\&.
.RE
.PP
\-n <nsid>, \-\-namespace\-id=<nsid>
.RS 4
The value for the ns\-id in the command\&.
.RE
.PP
\-[2\-9] <cdw>, \-\-cdw[2\-3,10\-15]=<cdw>
.RS 4
Specifies the command dword value for that specified entry in the command
.RE
.PP
\-r, \-\-read, \-w, \-\-write
.RS 4
Used for the data\-direction for the command and required for commands sending/receiving data\&. Don\(cqt use both read and write at the same time\&.
.RE
.PP
\-i <file>, \-\-input\-file=<file>
.RS 4
If the command is a data\-out (write) command, use this file to fill the buffer sent to the device\&. If no file is given, assumed to use STDIN\&.
.RE
.PP
\-l <data\-len>, \-\-data\-len=<data\-len>
.RS 4
The data length for the buffer used for this command\&.
.RE
.PP
\-m <data\-len>, \-\-metadata\-len=<data\-len>
.RS 4
The metadata length for the buffer used for this command\&.
.RE
.PP
\-s, \-\-show\-cmd
.RS 4
Print out the command to be sent\&.
.RE
.PP
\-d, \-\-dry\-run
.RS 4
Do not actually send the command\&. If want to use \-\-dry\-run option, \-\-show\-cmd option
\fImust\fR
be set\&. Otherwise \-\-dry\-run option will be
\fIignored\fR\&.
.RE
.PP
\-b, \-\-raw\-binary
.RS 4
Print the raw returned buffer to stdout if the command returns a structure\&.
.RE
.PP
\-p, \-\-prefill
.RS 4
Prefill the buffer with a predetermined byte value\&. Defaults to 0\&. This may be useful if the data you are writing is shorter than the required buffer, and you need to pad it with a known value\&. It may also be useful if you need to confirm if a device is overwriting a buffer for a data\-in command\&.
.RE
.PP
\-T, \-\-latency
.RS 4
Print out the latency the IOCTL took (in us)\&.
.RE
.SH "EXAMPLES"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
The following will run the admin command with opcode=6 and cdw10=1, which corresponds to an identify controller command\&. This example requires the data\-len param be 4096, which is the size of the returned structure\&. The \-r option is used because it is a data\-in command
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme admin\-passthru /dev/nvme0 \-\-opcode=06 \-\-data\-len=4096 \-\-cdw10=1 \-r
.fi
.if n \{\
.RE
.\}
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Or if you want to save that structure to a file:
.sp
.if n \{\
.RS 4
.\}
.nf
# nvme admin\-passthru /dev/nvme0 \-\-opcode=06 \-\-data\-len=4096 \-\-cdw10=1 \-r \-b > id_ns\&.raw
.fi
.if n \{\
.RE
.\}
.RE
.SH "NVME"
.sp
Part of the nvme\-user suite