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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>compare_ether_addr_64bits</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Networking and Network Devices APIs" /><link rel="up" href="ch02.html#id2748878" title="Driver Support" /><link rel="prev" href="re271.html" title="compare_ether_addr" /><link rel="next" href="re273.html" title="is_etherdev_addr" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>compare_ether_addr_64bits</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re271.html">Prev</a> </td><th width="60%" align="center">Driver Support</th><td width="20%" align="right"> <a accesskey="n" href="re273.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="compare_ether_addr_64bits"><a id="API-compare-ether-addr-64bits"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>compare_ether_addr_64bits —
Compare two Ethernet addresses
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">unsigned <b class="fsfunc">compare_ether_addr_64bits </b>(</code></td><td>const u8 <var class="pdparam">addr1[6+2]</var>, </td></tr><tr><td> </td><td>const u8 <var class="pdparam">addr2[6+2]</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2759574"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>addr1[6+2]</code></em></span></dt><dd><p>
Pointer to an array of 8 bytes
</p></dd><dt><span class="term"><em class="parameter"><code>addr2[6+2]</code></em></span></dt><dd><p>
Pointer to an other array of 8 bytes
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2759618"></a><h2>Description</h2><p>
Compare two ethernet addresses, returns 0 if equal.
Same result than <span class="quote">“<span class="quote">memcmp(addr1, addr2, ETH_ALEN)</span>”</span> but without conditional
branches, and possibly long word memory accesses on CPU allowing cheap
unaligned memory reads.
arrays = { byte1, byte2, byte3, byte4, byte6, byte7, pad1, pad2}
</p><p>
Please note that alignment of addr1 & addr2 is only guaranted to be 16 bits.
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