1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>__napi_alloc_skb</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="ch01s02.html" title="Socket Buffer Functions"><link rel="prev" href="API---netdev-alloc-skb.html" title="__netdev_alloc_skb"><link rel="next" href="API---kfree-skb.html" title="__kfree_skb"></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">__napi_alloc_skb</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API---netdev-alloc-skb.html">Prev</a>&#160;</td><th width="60%" align="center">Socket Buffer Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API---kfree-skb.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API---napi-alloc-skb"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>__napi_alloc_skb &#8212; 
2     allocate skbuff for rx in a specific NAPI instance
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">struct sk_buff * <b class="fsfunc">__napi_alloc_skb </b>(</code></td><td>struct napi_struct * <var class="pdparam">napi</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">length</var>, </td></tr><tr><td>&#160;</td><td>gfp_t <var class="pdparam">gfp_mask</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1096021908"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>napi</code></em></span></dt><dd><p>
4     napi instance this buffer was allocated for
5    </p></dd><dt><span class="term"><em class="parameter"><code>length</code></em></span></dt><dd><p>
6     length to allocate
7    </p></dd><dt><span class="term"><em class="parameter"><code>gfp_mask</code></em></span></dt><dd><p>
8     get_free_pages mask, passed to alloc_skb and alloc_pages
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1096025516"></a><h2>Description</h2><p>
10   Allocate a new sk_buff for use in NAPI receive.  This buffer will
11   attempt to allocate the head from a special reserved region used
12   only for NAPI Rx allocation.  By doing this we can save several
13   CPU cycles by avoiding having to disable and re-enable IRQs.
14   </p><p>
15
16   <code class="constant">NULL</code> is returned if there is no free memory.
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