nvme-admin-passthru man page
nvme-admin-passthru — Submit an arbitrary admin command, return results
nvme-admin-passthru <device> [--opcode=<opcode> | -o <opcode>] [--flags=<flags> | -f <flags>] [-rsvd=<rsvd> | -R <rsvd>] [--namespace-id=<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>] [--input-file=<file> | -f <file>] [--read | -r ] [--write | -w] [--timeout=<to> | -t <to>] [--show-command | --dry-run | -s] [--raw-binary | -b] [--prefill=<prefill> | -p <prefill>]
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.
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.
- -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.
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, --dry-run
Do not actually send the command; print out the command that would be sent.
- -b, --raw-binary
Print the raw returned buffer to stdout if the command returns a structure.
- -p, --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 for a data-in command.
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
Or if you want to save that structure to a file:
Part of the nvme-user suite