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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>pci_enable_msix</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch09s05.html" title="PCI Support Library" /><link rel="prev" href="re390.html" title="pci_enable_msi_block" /><link rel="next" href="re392.html" title="pci_msi_enabled" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>pci_enable_msix</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re390.html">Prev</a> </td><th width="60%" align="center">PCI Support Library</th><td width="20%" align="right"> <a accesskey="n" href="re392.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="pci_enable_msix"><a id="API-pci-enable-msix"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>pci_enable_msix —
configure device's MSI-X capability structure
</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">int <b class="fsfunc">pci_enable_msix </b>(</code></td><td>struct pci_dev * <var class="pdparam">dev</var>, </td></tr><tr><td> </td><td>struct msix_entry * <var class="pdparam">entries</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">nvec</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2678325"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>dev</code></em></span></dt><dd><p>
pointer to the pci_dev data structure of MSI-X device function
</p></dd><dt><span class="term"><em class="parameter"><code>entries</code></em></span></dt><dd><p>
pointer to an array of MSI-X entries
</p></dd><dt><span class="term"><em class="parameter"><code>nvec</code></em></span></dt><dd><p>
number of MSI-X irqs requested for allocation by device driver
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2678388"></a><h2>Description</h2><p>
Setup the MSI-X capability structure of device function with the number
of requested irqs upon its software driver call to request for
MSI-X mode enabled on its hardware device function. A return of zero
indicates the successful configuration of MSI-X capability structure
with new allocated MSI-X irqs. A return of < 0 indicates a failure.
Or a return of > 0 indicates that driver request is exceeding the number
of irqs or MSI-X vectors available. Driver should use the returned value to
re-send its request.
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