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Merging upstream version 1.16.
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<body class="manpage">
<div id="header">
<h1>
nvme-get-feature(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>nvme-get-feature -
Gets an NVMe feature, returns applicable results
</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 get-feature</em> &lt;device&gt; [--namespace-id=&lt;nsid&gt; | -n &lt;nsid&gt;]
[--feature-id=&lt;fid&gt; | -f &lt;fid&gt;] [--cdw11=&lt;cdw11&gt;]
[--uuid-index=&lt;uuid-index&gt; | -U &lt;uuid_index&gt;]
[--data-len=&lt;data-len&gt; | -l &lt;data-len&gt;]
[--sel=&lt;select&gt; | -s &lt;select&gt;]
[--raw-binary | -b]
[--human-readable | -H]</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>Submits an NVMe Get Feature admin command and returns the applicable
results. This may be the feature&#8217;s value, or may also include a feature
structure if the feature requires it (ex: LBA Range Type).</p></div>
<div class="paragraph"><p>The &lt;device&gt; 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 returned feature&#8217;s structure (if applicable) may be
returned in one of several ways depending on the option flags; the
structure may parsed by the program and printed in a readable format
if it is a known structure, displayed in hex, or the raw buffer may be
printed to stdout for another program to parse.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
-n &lt;nsid&gt;
</dt>
<dt class="hdlist1">
--namespace-id=&lt;nsid&gt;
</dt>
<dd>
<p>
Retrieve the feature for the given nsid. This is optional and
most features do not use this value.
</p>
</dd>
<dt class="hdlist1">
-f &lt;fid&gt;
</dt>
<dt class="hdlist1">
--feature-id=&lt;fid&gt;
</dt>
<dd>
<p>
The feature id to send with the command. Value provided should
be in hex.
</p>
</dd>
<dt class="hdlist1">
-s &lt;select&gt;
</dt>
<dt class="hdlist1">
--sel=&lt;select&gt;
</dt>
<dd>
<p>
Select (SEL): This field specifies which value of the attributes
to return in the provided data:
</p>
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<table rules="all"
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frame="border"
cellspacing="0" cellpadding="4">
<col width="50%" />
<col width="50%" />
<tbody>
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<td align="left" valign="top"><p class="table">Select</p></td>
<td align="left" valign="top"><p class="table">Description</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">0</p></td>
<td align="left" valign="top"><p class="table">Current</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">1</p></td>
<td align="left" valign="top"><p class="table">Default</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">2</p></td>
<td align="left" valign="top"><p class="table">Saved</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">3</p></td>
<td align="left" valign="top"><p class="table">Supported capabilities</p></td>
</tr>
<tr>
<td align="left" valign="top"><p class="table">47</p></td>
<td align="left" valign="top"><p class="table">Reserved</p></td>
</tr>
</tbody>
</table>
</div>
</dd>
<dt class="hdlist1">
-U &lt;uuid-index&gt;
</dt>
<dt class="hdlist1">
--uuid-index=&lt;uuid-index&gt;
</dt>
<dd>
<p>
UUID Index of the feature
</p>
</dd>
<dt class="hdlist1">
-l &lt;data-len&gt;
</dt>
<dt class="hdlist1">
--data-len=&lt;data-len&gt;
</dt>
<dd>
<p>
The data length for the buffer returned for this feature. Most
known features do not use this value. The exception is LBA
Range Type
</p>
</dd>
<dt class="hdlist1">
--cdw11=&lt;cdw11&gt;
</dt>
<dd>
<p>
The value for command dword 11, if applicable.
</p>
</dd>
<dt class="hdlist1">
-b
</dt>
<dt class="hdlist1">
--raw-binary
</dt>
<dd>
<p>
Print the raw feature buffer to stdout if the feature returns
a structure.
</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>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Retrieves the feature for Number of Queues, or feature id 7:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 7</code></pre>
</div></div>
</li>
<li>
<p>
The following retrieves the feature for the LBA Range Type, which
implicitly requires a buffer and will be printed to the screen in human
readable format:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 3</code></pre>
</div></div>
</li>
<li>
<p>
Retrieves the feature for the some vendor specific feature and
specifically requesting a buffer be allocate for this feature, which
will be displayed to the user in as a hex dump:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 0xc0 -l 512</code></pre>
</div></div>
<div class="paragraph"><p>Get feature with UUID index</p></div>
</li>
</ul></div>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 0xc0 -l 512 -U 0x1</code></pre>
</div></div>
<div class="ulist"><ul>
<li>
<p>
The following retrieves the feature for the LBA Range Type, which
implicitly requires a buffer and will be saved to a file in its raw
format:
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme get-feature /dev/nvme0 -f 3 --raw-binary &gt; lba_range.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>
</ul></div>
</div>
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<div class="sect1">
<h2 id="_nvme">NVME</h2>
<div class="sectionbody">
<div class="paragraph"><p>Part of the nvme-user suite</p></div>
</div>
</div>
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<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
2021-07-19 10:10:19 PDT
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