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+<table class="head">
+ <tr>
+ <td class="head-ltitle">ET(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">ET(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">et</code> &#x2014; <span class="Nd">Agere ET1310
+ 10/100/Gigabit Ethernet 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 et</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_et_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">et</code> driver supports PCI Express
+ Ethernet adapters based on the Agere ET1310 chip.</p>
+<p class="Pp">The <code class="Nm">et</code> driver supports the following media
+ types:</p>
+<p class="Pp"></p>
+<dl class="Bl-tag Bl-compact">
+ <dt>autoselect</dt>
+ <dd>Enable autoselection of the media types and options. The user can manually
+ override the autoselected mode by adding media options to the
+ <span class="Pa">/etc/rc.conf</span> file.
+ <p class="Pp"></p>
+ </dd>
+ <dt>10baseT/UTP</dt>
+ <dd>Set 10Mbps operation. The <var class="Ar">mediaopt</var> option can also
+ be used to select either <var class="Ar">full-duplex</var> or
+ <var class="Ar">half-duplex</var> modes.
+ <p class="Pp"></p>
+ </dd>
+ <dt>100baseTX</dt>
+ <dd>Set 100Mbps (Fast Ethernet) operation. The <var class="Ar">mediaopt</var>
+ option can also be used to select either <var class="Ar">full-duplex</var>
+ or <var class="Ar">half-duplex</var> modes.
+ <p class="Pp"></p>
+ </dd>
+ <dt>1000baseT</dt>
+ <dd>Set 1000Mbps (Gigabit Ethernet) operation. The
+ <var class="Ar">mediaopt</var> option can only be set to
+ <var class="Ar">full-duplex</var> mode.</dd>
+</dl>
+<p class="Pp">The <code class="Nm">et</code> driver supports the following
+ <var class="Ar">media</var> options:</p>
+<p class="Pp"></p>
+<dl class="Bl-tag Bl-compact">
+ <dt>full-duplex</dt>
+ <dd>Force full-duplex operation.
+ <p class="Pp"></p>
+ </dd>
+ <dt>half-duplex</dt>
+ <dd>Force half-duplex operation.</dd>
+</dl>
+<p class="Pp">Note that the 1000baseT media type is only available if it is
+ supported by the adapter. 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">et</code> driver supports Agere ET1310
+ 10/100/Gigabit Ethernet adapters.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="TUNABLES"><a class="permalink" href="#TUNABLES">TUNABLES</a></h1>
+<dl class="Bl-tag">
+ <dt id="hw.et.rx_intr_npkts"><var class="Va">hw.et.rx_intr_npkts</var></dt>
+ <dd>This value controls how many packets should be received before a receive
+ interrupt is generated. The default value is 32. It is recommended to set
+ this value above 38 to prevent the host from being livelocked under a high
+ degree of stress.</dd>
+ <dt id="hw.et.rx_intr_delay"><var class="Va">hw.et.rx_intr_delay</var></dt>
+ <dd>This value delays the generation of receive interrupts in units of ~4
+ microseconds. It is used together with
+ <var class="Va">hw.et.rx_intr_npkts</var> to achieve RX interrupt
+ moderation. The default value is 20.</dd>
+ <dt id="hw.et.tx_intr_nsegs"><var class="Va">hw.et.tx_intr_nsegs</var></dt>
+ <dd>This value controls how many segments (not packets) should be transmitted
+ before a transmit interrupt is generated. The default value is 126. It is
+ recommended to set this value below 280 to prevent the TX ring from
+ underflowing.</dd>
+ <dt id="hw.et.timer"><var class="Va">hw.et.timer</var></dt>
+ <dd>This value controls how often a timer interrupt should be generated. It is
+ used together with <var class="Va">hw.et.tx_intr_nsegs</var> to achieve TX
+ interrupt moderation. The default value is 1000000000 (nanoseconds).</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">et</code> device driver first appeared in
+ <span class="Ux">DragonFly 1.11</span>. The first
+ <span class="Ux">FreeBSD</span> release to include it was
+ <span class="Ux">FreeBSD 8.0</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">et</code> driver was written by
+ <span class="An">Sepherosa Ziehau</span>
+ &lt;<a class="Mt" href="mailto:sepherosa@gmail.com">sepherosa@gmail.com</a>&gt;
+ for <span class="Ux">DragonFly</span>. It was ported to
+ <span class="Ux">FreeBSD</span> by <span class="An">Xin LI</span>
+ &lt;<a class="Mt" href="mailto:delphij@FreeBSD.org">delphij@FreeBSD.org</a>&gt;.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">December 9, 2011</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>