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-<table class="head">
- <tr>
- <td class="head-ltitle">XENNET(4)</td>
- <td class="head-vol">Device Drivers Manual (xen)</td>
- <td class="head-rtitle">XENNET(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">xennet</code> &#x2014; <span class="Nd">Xen
- frontend paravirtualized network interface</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">xennet* at xenbus?</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">xennet</code> interface forms the frontend
- part of the paravirtualized drivers used by Xen guest domains to have
- network connectivity.</p>
-<p class="Pp">When the host domain is <span class="Ux">NetBSD</span>, the
- endpoint of the <code class="Nm">xennet</code> interface is a
- <a class="Xr">xvif(4)</a> interface. In the XenStore,
- <code class="Nm">xvif</code> and <code class="Nm">xennet</code> are
- identified by &#x201C;vif&#x201D; (virtual interface) entries.</p>
-<p class="Pp">Conceptually, frontends and backends drivers are similar to two
- Ethernet cards connected via a crossover cable.</p>
-<p class="Pp"><code class="Nm">xennet</code> interfaces can pass VLAN tagged
- packets.</p>
-<p class="Pp" id="XENNET_XNFRX_LOWAT">The minimum number of RX buffers can be
- controlled with the <code class="Li">hw.xennet.xnfrx_lowat</code> using the
- <a class="Xr">sysctl(8)</a> utility. The default is to reserve no minumum
- number of cached RX buffers. A minimum number of reserved RX buffers can
- also be compiled into the kernel config using the
- <a class="permalink" href="#XENNET_XNFRX_LOWAT"><i class="Em">XENNET_XNFRX_LOWAT</i></a>
- option.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
-<dl class="Bl-diag">
- <dt>xennet%d: can't read mac address, err %d</dt>
- <dd>The MAC address for this interface could not be read from XenStore.</dd>
- <dt>xennet%d: %s is not a valid mac address</dt>
- <dd>The MAC address specified in the configuration file of the newly created
- guest domain is invalid.</dd>
- <dt>xennet%d: using event channel %d</dt>
- <dd>The Xen event channel (virtual interrupt) ID associated to this
- <code class="Nm">xennet</code>.</dd>
- <dt>xennet%d: using RX copy mode</dt>
- <dd>The <code class="Nm">xennet</code> and its associated endpoint use copy
- mode for communication: packets are copied from one domain's memory to
- another.</dd>
-</dl>
-</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">bridge(4)</a>, <a class="Xr">ifmedia(4)</a>,
- <a class="Xr">options(4)</a>, <a class="Xr">xenbus(4)</a>,
- <a class="Xr">xvif(4)</a>, <a class="Xr">ifconfig(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">xennet</code> driver first appeared in
- <span class="Ux">NetBSD 3.0</span>.</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">xennet</code> driver was written by
- <span class="An">Manuel Bouyer</span>
- &lt;<a class="Mt" href="mailto:bouyer@NetBSD.org">bouyer@NetBSD.org</a>&gt;
- and <span class="An">Christian Limpach</span>
- &lt;<a class="Mt" href="mailto:chris@pin.lu">chris@pin.lu</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">August 27, 2025</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>