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-<table class="head">
- <tr>
- <td class="head-ltitle">IF_NTB(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">IF_NTB(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">if_ntb</code> &#x2014; <span class="Nd">Virtual
- Ethernet interface for Non-Transparent Bridges</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp">To compile this driver into your kernel, place the following lines
- in your kernel configuration file:</p>
-<div class="Bd Pp Bd-indent"><code class="Cd">device ntb</code>
-<br/>
-<code class="Cd">device ntb_transport</code>
-<br/>
-<code class="Cd">device if_ntb</code></div>
-<p class="Pp">Or, to load the driver as a module at boot, place the following
- line in <a class="Xr">loader.conf(5)</a>:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>if_ntb_load=&quot;YES&quot;</pre>
-</div>
-<p class="Pp">The following tunables are settable from the
- <a class="Xr">loader(8)</a>:</p>
-<dl class="Bl-ohang">
- <dt id="hw.if_ntb.num_queues"><var class="Va">hw.if_ntb.num_queues</var></dt>
- <dd>Limits maximal number of queues per interface. Default is unlimited.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">if_ntb</code> driver attaches on top of the
- <a class="Xr">ntb_transport(4)</a> driver to utilize one or more of its
- packet queues to create virtual Ethernet network interface between the
- systems. Typical MTU for the interface is about 64KB to reduce overhead.
- Default MAC address for the interface is randomly generated.</p>
-<p class="Pp">The <code class="Nm">if_ntb</code> driver does not implement any
- real hardware offload, but since PCIe link is protected by CRC32, in some
- situations it may be possible to save some CPU cycles by enabling fake
- checksum offload on both link sides via setting
- <code class="Cm">rxcsum</code> and <code class="Cm">txcsum</code> interface
- options.</p>
-</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">ntb_transport(4)</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">if_ntb</code> driver was developed by Intel
- and originally written by <span class="An">Carl Delsey</span>
- &lt;<a class="Mt" href="mailto:carl@FreeBSD.org">carl@FreeBSD.org</a>&gt;.
- Later improvements were done by <span class="An">Conrad E. Meyer</span>
- &lt;<a class="Mt" href="mailto:cem@FreeBSD.org">cem@FreeBSD.org</a>&gt; and
- <span class="An">Alexander Motin</span>
- &lt;<a class="Mt" href="mailto:mav@FreeBSD.org">mav@FreeBSD.org</a>&gt;.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">Linux supports only one queue per interface, so manual
- configuration may be required for compatibility.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">September 2, 2017</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>