nvme-id-ctrl1

Usage

Overview

For the NVMe device given, sends an identify controller command and provides the result and returned structure.

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 structure may be returned in one of several ways depending on the option flags; the structure may be parsed by the program or the raw buffer may be printed to stdout.

The bare nvme id-ctrl form (without a space) still works as a deprecated alias and will be removed in a future major version. New scripts should use nvme id ctrl instead.

Options

-b, --raw-binary

Print the raw buffer to stdout. Structure is not parsed by program. This overrides the vendor specific and human readable options.

-V, --vendor-specific

In addition to parsing known fields, this option will dump the vendor specific region of the structure in hex with ascii interpretation.

Options

The following options are defined at the top-level nvme command and are available to this subcommand:

--dry-run

Print the command that would be executed, but do not actually execute it.

--no-ioctl-probing

Disable probing for 64-bit IOCTL support.

--no-retries

Disable retry logic on transient errors.

-o <fmt>, --output-format=<fmt>

Set the reporting format to normal, tabular, 'json, or binary. Only one output format may be used at a time.

--output-format-version=<version>

Select the output format version. Version 1 uses the original field naming, while version 2 (default) provides more consistent and script-friendly field names. Other versions are rejected.

--quiet

Suppress informational messages. Errors are still reported, and --quiet cancels any --verbose for the library log level.

--set-options=<key=value>[,<key=value>...]

Set libnvme library options for this invocation. Supported keys are force-4k, mi-probe-enabled, test-base-dir and test-sysfs-dir.

--timeout=<ms>

Set the timeout for the command in milliseconds. infinite or -1 waits without a time limit (0xffffffff).

-v, --verbose

Increase the level of detail in the output. May be specified multiple times to further increase verbosity.

These options can also be set as machine-wide defaults in nvme-cli.conf(5). A command-line flag always overrides the file.

Examples

# nvme id ctrl /dev/nvme0

# nvme id ctrl /dev/nvme0 --vendor-specific
# nvme id ctrl /dev/nvme0 -V

# nvme id ctrl /dev/nvme0 --raw-binary > id_ctrl.raw
# nvme id ctrl /dev/nvme0 -b > id_ctrl.raw

# nvme id ctrl /dev/nvme0 --raw-binary | nvme_parse_id_ctrl

/* File: nvme_parse_id_ctrl.c */
#include <linux/nvme.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char **argv)
{
        unsigned char buf[sizeof(struct nvme_id_ctrl)];
        struct nvme_id_ctrl *ctrl = (struct nvme_id_ctrl *)buf;
        if (read(STDIN_FILENO, buf, sizeof(buf)))
                return 1;
        printf("vid   : %#x\n", ctrl->vid);
        printf("ssvid : %#x\n", ctrl->ssvid);
        return 0;
}

Nvme

Part of the nvme-user suite