Sophie: kernel-doc-3.11.10-100.fc18 noarch

kernel-doc-3.11.10-100.fc18.noarch.rpm

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>build_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---alloc-skb.html" title="__alloc_skb" /><link rel="next" href="API-netdev-alloc-frag.html" title="netdev_alloc_frag" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">build_skb</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API---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-netdev-alloc-frag.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-build-skb"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>build_skb &#8212; 
     build a network buffer
 </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 * <strong class="fsfunc">build_skb </strong>(</code></td><td>void * <var class="pdparam">data</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">frag_size</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140045380001280"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
     data buffer provided by caller
    </p></dd><dt><span class="term"><em class="parameter"><code>frag_size</code></em></span></dt><dd><p>
     size of fragment, or 0 if head was kmalloced
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140045379996320"></a><h2>Description</h2><p>
   Allocate a new <span class="structname">sk_buff</span>. Caller provides space holding head and
   skb_shared_info. <em class="parameter"><code>data</code></em> must have been allocated by <code class="function">kmalloc</code> only if
   <em class="parameter"><code>frag_size</code></em> is 0, otherwise data should come from the page allocator.
   The return is the new skb buffer.
   On a failure the return is <code class="constant">NULL</code>, and <em class="parameter"><code>data</code></em> is not freed.
</p></div><div class="refsect1"><a id="idm140045379991680"></a><h2>Notes </h2><p>
   Before IO, driver allocates only data buffer where NIC put incoming frame
   Driver should add room at head (NET_SKB_PAD) and
   MUST add room at tail (SKB_DATA_ALIGN(skb_shared_info))
   After IO, driver calls <code class="function">build_skb</code>, to allocate sk_buff and populate it
   before giving packet to stack.
   RX rings only contains data buffers, not full skbs.
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