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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">ENA(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">ENA(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">ena</code> &#x2014; <span class="Nd">NetBSD
- kernel driver for Elastic Network Adapter (ENA) family</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">ena* at pci? dev ? function ?</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The ENA is a networking interface designed to make good use of
- modern CPU features and system architectures.</p>
-<p class="Pp">The ENA device exposes a lightweight management interface with a
- minimal set of memory mapped registers and extendable command set through an
- Admin Queue.</p>
-<p class="Pp">The driver supports a range of ENA devices, is link-speed
- independent (i.e., the same driver is used for 10GbE, 25GbE, 40GbE, etc.),
- and has a negotiated and extendable feature set.</p>
-<p class="Pp">Some ENA devices support SR-IOV. This driver is used for both the
- SR-IOV Physical Function (PF) and Virtual Function (VF) devices.</p>
-<p class="Pp">The ENA devices enable high speed and low overhead network traffic
- processing by providing multiple Tx/Rx queue pairs (the maximum number is
- advertised by the device via the Admin Queue), a dedicated MSI-X interrupt
- vector per Tx/Rx queue pair, and CPU cacheline optimized data placement.</p>
-<p class="Pp">The <code class="Nm">ena</code> driver supports industry standard
- TCP/IP offload features such as checksum offload and TCP transmit
- segmentation offload (TSO). Receive-side scaling (RSS) is supported for
- multi-core scaling.</p>
-<p class="Pp">The <code class="Nm">ena</code> driver and its corresponding
- devices implement health monitoring mechanisms such as watchdog, enabling
- the device and driver to recover in a manner transparent to the application,
- as well as debug logs.</p>
-<p class="Pp">Some of the ENA devices support a working mode called Low-latency
- Queue (LLQ), which saves several more microseconds. This feature might be
- implemented for the driver in future releases.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
-<p class="Pp">Supported PCI vendor ID/device IDs:</p>
-<p class="Pp"></p>
-<ul class="Bl-bullet Bl-compact">
- <li>1d0f:0ec2 - ENA PF</li>
- <li>1d0f:1ec2 - ENA PF with LLQ support</li>
- <li>1d0f:ec20 - ENA VF</li>
- <li>1d0f:ec21 - ENA VF with LLQ support</li>
-</ul>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">arp(4)</a>, <a class="Xr">ifmedia(4)</a>,
- <a class="Xr">netintro(4)</a>, <a class="Xr">pci(4)</a>,
- <a class="Xr">ifconfig(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">ena</code> driver was originally written by
- <span class="An">Semihalf</span> for <span class="Ux">FreeBSD</span>. The
- driver was ported to <span class="Ux">NetBSD</span> by
- <span class="An">Jared D. McNeill</span>
- &lt;<a class="Mt" href="mailto:jmcneill@NetBSD.org">jmcneill@NetBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">December 1, 2018</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>