'\" t
.\"     Title: nvme-io-passthru
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 04/15/2023
.\"    Manual: NVMe Manual
.\"    Source: NVMe
.\"  Language: English
.\"
.TH "NVME\-IO\-PASSTHRU" "1" "04/15/2023" "NVMe" "NVMe Manual"
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.SH "NAME"
nvme-io-passthru \- Submit an arbitrary io command, return results
.SH "SYNOPSIS"
.sp
.nf
\fInvme\-io\-passthru\fR <device> [\-\-opcode=<opcode> | \-o <opcode>]
                [\-\-flags=<flags> | \-f <flags>] [\-rsvd=<rsvd> | \-R <rsvd>]
                [\-\-namespace\-id=<nsid> | \-nsid <nsid>]
                [\-\-cdw2=<cdw2>] [\-\-cdw3=<cdw3>] [\-\-cdw10=<cdw10>]
                [\-\-cdw11=<cdw11>] [\-\-cdw12=<cdw12>] [\-\-cdw13=<cdw13>]
                [\-\-cdw14=<cdw14>] [\-\-cdw15=<cdw15>]
                [\-\-data\-len=<data\-len> | \-l <data\-len>]
                [\-\-metadata\-len=<len> | \-m <len>]
                [\-\-read | \-r ] [\-\-write | \-w]
                [\-\-input\-file=<file> | \-i <file>]
                [\-\-metadata=<file> | \-M <file>]
                [\-\-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 IO command and returns the applicable results\&. This may be the simply the command\(cqs 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\&. Defaults to
\fI0\fR\&.
.RE
.PP
\-\-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\&. If the command is a data\-in (read) command, the data returned from the device will be saved here\&.
.RE
.PP
\-M <file>, \-\-metadata=<file>
.RS 4
If the command is a data\-out (write) command, use this file to fill the metadata buffer sent to the device\&. If no file is given, assumed to use STDIN\&. If the command is a data\-in (read) command, the metadata returned from the device will be saved here\&.
.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 data or a structure\&.
.RE
.PP
\-p <prefill>, \-\-prefill <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 on a data\-in command\&.
.RE
.PP
\-T, \-\-latency
.RS 4
Print out the latency the IOCTL took (in us)\&.
.RE
.SH "EXAMPLES"
.sp
nvme io\-passthru /dev/nvme0n1 \-\-opcode=2 \-\-namespace\-id=1 \-\-data\-len=4096 \-\-read \-\-cdw10=0 \-\-cdw11=0 \-\-cdw12=0x70000 \-\-raw\-binary
.SH "NVME"
.sp
Part of the nvme\-user suite