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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">JME(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">JME(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">jme</code> &#x2014; <span class="Nd">JMicron
- Technologies JMC250 Gigabit Ethernet and JMC260 Fast Ethernet controller
- driver</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">jme* at pci? dev ? function ?</code></p>
-<p class="Pp">Configuration of PHYs is necessary. See
- <a class="Xr">mii(4)</a>.</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">jme</code> device driver supports network
- adapters based on the JMicron Technologies JMC250 Gigabit Ethernet and
- JMC260 Fast Ethernet chips. The following features are supported:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>IPv4 transmit/receive IP/TCP/UDP checksum offload
-IPv6 transmit TCP/UDP checksum offload
-IPv4 and IPv6 TCP segmentation offload
-VLAN tag insertion/removal
-Interrupt coalescing
-10/100/1000Mbps operation in full-duplex mode
-10/100Mbps operation in half-duplex mode
-Jumbo frames (up to 9022 bytes)</pre>
-</div>
-<p class="Pp">Due to hardware limitation checksums and TCP segmentation offload
- can't be enabled if the configured MTU is larger than 4000 bytes.</p>
-<p class="Pp">Interrupt coalescing can be controlled on a per-adapter basis
- through the following sysctls:</p>
-<dl class="Bl-tag">
- <dt id="hw.jme.jme_x_.int_rxtos"><a class="permalink" href="#hw.jme.jme_x_.int_rxtos"><code class="Cm">hw.jme.jme&lt;x&gt;.int_rxtos</code></a></dt>
- <dd>jme receive interrupt moderation timer, in microseconds (defaults to
- 100)</dd>
- <dt id="hw.jme.jme_x_.int_rxct"><a class="permalink" href="#hw.jme.jme_x_.int_rxct"><code class="Cm">hw.jme.jme&lt;x&gt;.int_rxct</code></a></dt>
- <dd>jme receive interrupt moderation packet counter (defaults to 128)</dd>
- <dt id="hw.jme.jme_x_.int_txto"><a class="permalink" href="#hw.jme.jme_x_.int_txto"><code class="Cm">hw.jme.jme&lt;x&gt;.int_txto</code></a></dt>
- <dd>jme transmit interrupt moderation timer, in microseconds (defaults to
- 100)</dd>
- <dt id="hw.jme.jme_x_.int_txct"><a class="permalink" href="#hw.jme.jme_x_.int_txct"><code class="Cm">hw.jme.jme&lt;x&gt;.int_txct</code></a></dt>
- <dd>jme transmit interrupt moderation packet counter (defaults to 128)</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">ifmedia(4)</a>, <a class="Xr">jmphy(4)</a>,
- <a class="Xr">mii(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="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">jme</code> device driver first appeared in
- <span class="Ux">NetBSD 5.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">Hardware bugs prevent support of IPv6 receive TCP/UDP checksum
- offload in the JMC250 rev A2, and is disabled in the driver. This should be
- revisited when a newer hardware revision is available.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">October 30, 2019</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>