<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!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>Chapter 6. Network Layer Functions</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Z8530 Programming Guide" /><link rel="up" href="index.html" title="Z8530 Programming Guide" /><link rel="prev" href="ch05.html" title="Chapter 5. Configuring And Activating The Port" /><link rel="next" href="ch07.html" title="Chapter 7. Porting The Z8530 Driver" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 6. Network Layer Functions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch05.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ch07.html">Next</a></td></tr></table><hr /></div><div class="chapter" title="Chapter 6. Network Layer Functions"><div class="titlepage"><div><div><h2 class="title"><a id="Network_Layer_Functions"></a>Chapter 6. Network Layer Functions</h2></div></div></div><p> The Z8530 layer provides functions to queue packets for transmission. The driver internally buffers the frame currently being transmitted and one further frame (in order to keep back to back transmission running). Any further buffering is up to the caller. </p><p> The function <code class="function">z8530_queue_xmit</code> takes a network buffer in sk_buff format and queues it for transmission. The caller must provide the entire packet with the exception of the bitstuffing and CRC. This is normally done by the caller via the generic HDLC interface layer. It returns 0 if the buffer has been queued and non zero values for queue full. If the function accepts the buffer it becomes property of the Z8530 layer and the caller should not free it. </p><p> The function <code class="function">z8530_get_stats</code> returns a pointer to an internally maintained per interface statistics block. This provides most of the interface code needed to implement the network layer get_stats callback. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch05.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="ch07.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 5. Configuring And Activating The Port </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 7. Porting The Z8530 Driver</td></tr></table></div></body></html>
