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<body class="manpage">
<div id="header">
<h1>
nvme-id-ctrl(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>nvme-id-ctrl -
   Send NVMe Identify Controller, return result and structure
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><em>nvme id-ctrl</em> <device> [--vendor-specific | -V] [--raw-binary | -b]
                        [--output-format=<fmt> | -o <fmt>] [--verbose | -v]</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>For the NVMe device given, sends an identify controller command and
provides the result and returned structure.</p></div>
<div class="paragraph"><p>The <device> parameter is mandatory and may be either the NVMe character
device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1).</p></div>
<div class="paragraph"><p>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.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
-b
</dt>
<dt class="hdlist1">
--raw-binary
</dt>
<dd>
<p>
        Print the raw buffer to stdout. Structure is not parsed by
        program. This overrides the vendor specific and human readable options.
</p>
</dd>
<dt class="hdlist1">
-V
</dt>
<dt class="hdlist1">
--vendor-specific
</dt>
<dd>
<p>
        In addition to parsing known fields, this option will dump
        the vendor specific region of the structure in hex with ascii
        interpretation.
</p>
</dd>
<dt class="hdlist1">
-H
</dt>
<dt class="hdlist1">
--human-readable
</dt>
<dd>
<p>
        This option will parse and format many of the bit fields
        into human-readable formats.
</p>
</dd>
<dt class="hdlist1">
-o <fmt>
</dt>
<dt class="hdlist1">
--output-format=<fmt>
</dt>
<dd>
<p>
        Set the reporting format to <em>normal</em>, <em>json</em> or <em>binary</em>. Only one
        output format can be used at a time.
</p>
</dd>
<dt class="hdlist1">
-v
</dt>
<dt class="hdlist1">
--verbose
</dt>
<dd>
<p>
        Increase the information detail in the output.
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Has the program interpret the returned buffer and display the known
fields in a human readable format:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme id-ctrl /dev/nvme0</code></pre>
</div></div>
</li>
<li>
<p>
In addition to showing the known fields, has the program to display
the vendor unique field:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme id-ctrl /dev/nvme0 --vendor-specific
# nvme id-ctrl /dev/nvme0 -V</code></pre>
</div></div>
<div class="paragraph"><p>The above will dump the <em>vs</em> buffer in hex since it doesn’t know how to
interpret it.</p></div>
</li>
<li>
<p>
Have the program return the raw structure in binary:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme id-ctrl /dev/nvme0 --raw-binary > id_ctrl.raw
# nvme id-ctrl /dev/nvme0 -b > id_ctrl.raw</code></pre>
</div></div>
<div class="paragraph"><p>It is probably a bad idea to not redirect stdout when using this mode.</p></div>
</li>
<li>
<p>
Alternatively you may want to send the data to another program that
can parse the raw buffer.
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme id-ctrl /dev/nvme0 --raw-binary | nvme_parse_id_ctrl</code></pre>
</div></div>
<div class="paragraph"><p>The parse program in the above example can be a program that shows the
structure in a way you like. The following program is such an example
that will parse it and can accept the output through a pipe, <code>'|'</code>,
as shown in the above example, or you can <code>'cat'</code> a saved output buffer to it.</p></div>
</li>
</ul></div>
<div class="listingblock">
<div class="content">
<pre><code>/* 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;
}</code></pre>
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<div class="sect1">
<h2 id="_nvme">NVME</h2>
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<div class="paragraph"><p>Part of the nvme-user suite</p></div>
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Last updated
 2025-02-13 00:00:00 UTC
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