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nvme-io-passthru(1)
===================
NAME
----
nvme-io-passthru - Submit an arbitrary io command, return results
SYNOPSIS
--------
[verse]
'nvme-io-passthru' <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>]
[--timeout=<to> | -t <to>]
[--show-command | -s]
[--dry-run | -d]
[--raw-binary | -b]
[--prefill=<prefill> | -p <prefill>]
[--latency | -T]
DESCRIPTION
-----------
Submits an arbitrary NVMe IO command and returns the applicable
results. This may be the simply the command's result and status, or may
also include a buffer if the command returns one. This command does no
interpretation of the opcodes or options.
The <device> parameter is mandatory and may be either the NVMe character
device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1).
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.
OPTIONS
-------
-o <opcode>::
--opcode=<opcode>::
The NVMe opcode to send to the device in the command
-f <flags>::
--flags=<flags>::
The NVMe command flags to send to the device in the command
-R <rsvd>::
--rsvd=<rsvd>::
The value for the reserved field in the command.
-n <nsid>::
--namespace-id=<nsid>::
The value for the ns-id in the command. Defaults to '0'.
--cdw[2-3,10-15]=<cdw>::
Specifies the command dword value for that specified entry in
the command
-r::
--read::
-w::
--write::
Used for the data-direction for the command and required for
commands sending/receiving data. Don't use both read and write
at the same time.
-i <file>::
--input-file=<file>::
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.
-l <data-len>::
--data-len=<data-len>::
The data length for the buffer used for this command.
-m <data-len>::
--metadata-len=<data-len>::
The metadata length for the buffer used for this command.
-s::
--show-cmd::
Print out the command to be sent.
-d::
--dry-run::
Do not actually send the command. If want to use --dry-run option,
--show-cmd option _must_ be set. Otherwise --dry-run option will be
_ignored_.
-b::
--raw-binary::
Print the raw returned buffer to stdout if the command returns
data or a structure.
-p <prefill>::
--prefill <prefill>::
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.
-T::
--latency::
Print out the latency the IOCTL took (in us).
EXAMPLES
--------
nvme io-passthru /dev/nvme0n1 --opcode=2 --namespace-id=1 --data-len=4096 --read --cdw10=0 --cdw11=0 --cdw12=0x70000 --raw-binary
NVME
----
Part of the nvme-user suite
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