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+<table class="head">
+ <tr>
+ <td class="head-ltitle">AE(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">AE(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">ae</code> &#x2014;
+ <span class="Nd">Attansic/Atheros L2 FastEthernet controller
+ driver</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 the kernel, place the following lines
+ in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device miibus</code>
+<br/>
+<code class="Cd">device ae</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+ the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>if_ae_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">ae</code> device driver provides support for
+ Attansic/Atheros L2 PCIe FastEthernet controllers.</p>
+<p class="Pp">The controller supports hardware Ethernet checksum processing,
+ hardware VLAN tag stripping/insertion and an interrupt moderation mechanism.
+ Attansic L2 also features a 64-bit multicast hash filter.</p>
+<p class="Pp">The <code class="Nm">ae</code> driver supports the following media
+ types:</p>
+<dl class="Bl-tag">
+ <dt id="autoselect"><a class="permalink" href="#autoselect"><code class="Cm">autoselect</code></a></dt>
+ <dd>Enable autoselection of the media type and options. The user can manually
+ override the autoselected mode by adding media options to
+ <a class="Xr">rc.conf(5)</a>.</dd>
+ <dt id="10baseT/UTP"><a class="permalink" href="#10baseT/UTP"><code class="Cm">10baseT/UTP</code></a></dt>
+ <dd>Select 10Mbps operation.</dd>
+ <dt id="100baseTX"><a class="permalink" href="#100baseTX"><code class="Cm">100baseTX</code></a></dt>
+ <dd>Set 100Mbps (FastEthernet) operation.</dd>
+</dl>
+<p class="Pp">The <code class="Nm">ae</code> driver provides support for the
+ following media options:</p>
+<dl class="Bl-tag">
+ <dt id="full-duplex"><a class="permalink" href="#full-duplex"><code class="Cm">full-duplex</code></a></dt>
+ <dd>Force full duplex operation.</dd>
+ <dt id="half-duplex"><a class="permalink" href="#half-duplex"><code class="Cm">half-duplex</code></a></dt>
+ <dd>Force half duplex operation.</dd>
+</dl>
+<p class="Pp">For more information on configuring this device, see
+ <a class="Xr">ifconfig(8)</a>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HARDWARE"><a class="permalink" href="#HARDWARE">HARDWARE</a></h1>
+<p class="Pp">The <code class="Nm">ae</code> driver supports Attansic/Atheros L2
+ PCIe FastEthernet controllers, and is known to support the following
+ hardware:</p>
+<p class="Pp"></p>
+<ul class="Bl-bullet Bl-compact">
+ <li>ASUS EeePC 701</li>
+ <li>ASUS EeePC 900</li>
+</ul>
+<p class="Pp">Other hardware may or may not work with this driver.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="LOADER_TUNABLES"><a class="permalink" href="#LOADER_TUNABLES">LOADER
+ TUNABLES</a></h1>
+<p class="Pp">Tunables can be set at the <a class="Xr">loader(8)</a> prompt
+ before booting the kernel or stored in <a class="Xr">loader.conf(5)</a>.</p>
+<dl class="Bl-tag">
+ <dt id="hw.ae.msi_disable"><var class="Va">hw.ae.msi_disable</var></dt>
+ <dd>This tunable disables MSI support on the Ethernet hardware. The default
+ value is 0.</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYSCTL_VARIABLES"><a class="permalink" href="#SYSCTL_VARIABLES">SYSCTL
+ VARIABLES</a></h1>
+<p class="Pp">The <code class="Nm">ae</code> driver collects a number of useful
+ MAC counter during the work. The statistics is available via the
+ <var class="Va">dev.ae.%d.stats</var> <a class="Xr">sysctl(8)</a> tree,
+ where %d corresponds to the controller number.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DIAGNOSTICS"><a class="permalink" href="#DIAGNOSTICS">DIAGNOSTICS</a></h1>
+<dl class="Bl-diag">
+ <dt>ae%d: watchdog timeout.</dt>
+ <dd>The device has stopped responding to the network, or there is a problem
+ with the network connection (cable).</dd>
+ <dt>ae%d: reset timeout.</dt>
+ <dd>The card reset operation has been timed out.</dd>
+ <dt>ae%d: Generating random ethernet address.</dt>
+ <dd>No valid Ethernet address was found in the controller NVRAM and registers.
+ Random locally administered address with ASUS OUI identifier will be used
+ instead.</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">altq(4)</a>, <a class="Xr">arp(4)</a>,
+ <a class="Xr">miibus(4)</a>, <a class="Xr">netintro(4)</a>,
+ <a class="Xr">ng_ether(4)</a>, <a class="Xr">vlan(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">ae</code> driver and this manual page was
+ written by <span class="An">Stanislav Sedov</span>
+ &lt;<a class="Mt" href="mailto:stas@FreeBSD.org">stas@FreeBSD.org</a>&gt;.
+ It first appeared in <span class="Ux">FreeBSD 7.1</span>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
+<p class="Pp">The Attansic L2 FastEthernet controller supports DMA but does not
+ use a descriptor based transfer mechanism via scatter-gather DMA. Thus the
+ data should be copied to/from the controller memory on each
+ transmit/receive. Furthermore, a lot of data alignment restrictions apply.
+ This may introduce a high CPU load on systems with heavy network activity.
+ Luckily enough this should not be a problem on modern hardware as L2 does
+ not support speeds faster than 100Mbps.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">May 17, 2019</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>