1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>netdev_master_upper_dev_link</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Networking and Network Devices APIs"><link rel="up" href="netdev.html#idp1097739572" title="Driver Support"><link rel="prev" href="API-netdev-upper-dev-link.html" title="netdev_upper_dev_link"><link rel="next" href="API-netdev-upper-dev-unlink.html" title="netdev_upper_dev_unlink"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">netdev_master_upper_dev_link</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-netdev-upper-dev-link.html">Prev</a>&#160;</td><th width="60%" align="center">Driver Support</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-netdev-upper-dev-unlink.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-netdev-master-upper-dev-link"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>netdev_master_upper_dev_link &#8212; 
2     Add a master link to the upper device
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">netdev_master_upper_dev_link </b>(</code></td><td>struct net_device * <var class="pdparam">dev</var>, </td></tr><tr><td>&#160;</td><td>struct net_device * <var class="pdparam">upper_dev</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1098178948"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>dev</code></em></span></dt><dd><p>
4     device
5    </p></dd><dt><span class="term"><em class="parameter"><code>upper_dev</code></em></span></dt><dd><p>
6     new upper device
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1098181548"></a><h2>Description</h2><p>
8   Adds a link to device which is upper to this one. In this case, only
9   one master upper device can be linked, although other non-master devices
10   might be linked as well. The caller must hold the RTNL lock.
11   On a failure a negative errno code is returned. On success the reference
12   counts are adjusted and the function returns zero.
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