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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/mac/mac_design_lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
|
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</div><div class="- topic/body body"><section class="- topic/section section" id="id__id2" data-ofbid="id__id2"><h2 class="- topic/title title sectiontitle">代码结构</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d108157e25__20250121171544">Ethernet 的源码牵涉三个目录 </p>
|
||
<ul class="- topic/ul ul simple" data-ofbid="d108157e28__20250121171544"><li class="- topic/li li" data-ofbid="d108157e29__20250121171544"><p class="- topic/p p" data-ofbid="d108157e30__20250121171544">硬件驱动相关</p><span class="+ topic/ph sw-d/filepath ph filepath">packages/third-party/lwip/contrib/ports/drv/aic/</span></li><li class="- topic/li li" data-ofbid="d108157e34__20250121171544"><p class="- topic/p p" data-ofbid="d108157e35__20250121171544">操作系统相关</p>LwIP 运行需要实现的操作系统相关接口及架构相关的定义
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">packages/third-party/lwip/contrib/ports/rt-thread/</span></li><li class="- topic/li li" data-ofbid="d108157e40__20250121171544"><p class="- topic/p p" data-ofbid="d108157e41__20250121171544">LwIP 内核相关</p>LwIP 内核协议栈源码
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">packages/third-party/lwip/src/</span></li></ul>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_s5t_kzn_fdc" data-ofbid="id__table_s5t_kzn_fdc" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">驱动文件说明</span></caption><colgroup><col style="width:32.02764976958525%"/><col style="width:67.97235023041476%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_s5t_kzn_fdc__entry__1">文件名称</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_s5t_kzn_fdc__entry__2">用途</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__1">aic_mac.c</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__2">实际操作 MAC 寄存器的 MAC 驱动源文件</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__1">aic_mac.h</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__2">MAC 驱动头文件</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__1">aic_mac_ll.c</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__2">非操作 MAC 寄存器 MAC 驱动源文件</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__1">aic_mac_reg.h</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__2">MAC 寄存器定义头文件</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__1">aic_phy.c</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__2">通用 PHY 驱动源文件</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__1">aic_phy.h</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__2">通用 PHY 驱动头文件</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__1">ethernetif.c</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_s5t_kzn_fdc__entry__2">LwIP 接口需要调用的核心 MAC 驱动源文件</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_s5t_kzn_fdc__entry__1">ethernetif.h</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_s5t_kzn_fdc__entry__2">LwIP 接口需要调用的 MAC 驱动头文件</td></tr></tbody></table></div>
|
||
</section><section class="- topic/section section" id="id__id4" data-ofbid="id__id4"><h2 class="- topic/title title sectiontitle">驱动架构</h2>
|
||
|
||
<div class="- topic/div div section" id="id__id5">
|
||
<strong class="+ topic/ph hi-d/b ph b"></strong>
|
||
<p class="- topic/p p" data-ofbid="d108157e113__20250121171544"><span class="- topic/ph ph">Luban-Lite</span> GMAC 驱动架构如下图。应用程序可通过标准 Socket 接口或基于 RAW 的 Callback 接口编写应
|
||
用逻辑。除此之外，<span class="- topic/ph ph">Luban-Lite</span> 在标准 LwIP 上封装了部分测试命令(ArtInChip
|
||
Tools)，如”ping”、”iperf”、”ifconfig”、 “mqtt”等测试命令可供上层开发人员进行基础的测试。</p><figure class="- topic/fig fig fignone" data-ofbid="d108157e120__20250121171544"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" src="../../../images/mac/mac-system.png" alt="mac-system"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">驱动架构图</span></figcaption></figure></div>
|
||
</section><section class="- topic/section section" id="id__id6" data-ofbid="id__id6"><h2 class="- topic/title title sectiontitle">关键流程设计</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d108157e132__20250121171544">以太网在初始化过程中会创建三个任务， 三个任务的优先级由高到低分别是：线路链接状态检测任务、 网卡数据包输入任务、以及协议栈处理任务、</p>
|
||
<ul class="- topic/ul ul simple" data-ofbid="d108157e135__20250121171544"><li class="- topic/li li" data-ofbid="d108157e136__20250121171544">
|
||
<dl class="- topic/dl dl simple" data-ofbid="d108157e138__20250121171544"><dt class="- topic/dt dt dlterm" data-ofbid="d108157e140__20250121171544"> 线路链接状态检测任务</dt><dd class="- topic/dd dd">
|
||
<p class="- topic/p p" data-ofbid="d108157e144__20250121171544">线路链路状态检测任务是周期轮询的任务，轮询时间一般为 1S 或 2S。主要功能是实时检测当前
|
||
网络链路的链接状态，一旦网络链路状态发生改变，就通过当前的链路状态选择当前以太网的打开状态</p>
|
||
</dd></dl>
|
||
</li><li class="- topic/li li" data-ofbid="d108157e148__20250121171544">
|
||
<dl class="- topic/dl dl simple" data-ofbid="d108157e150__20250121171544"><dt class="- topic/dt dt dlterm" data-ofbid="d108157e152__20250121171544"> 网卡数据包输入任务</dt><dd class="- topic/dd dd">
|
||
<p class="- topic/p p" data-ofbid="d108157e156__20250121171544">网络包接收任务可以是周期轮询的任务也可以是事件驱动型的任务，主要取决于产品需求。 主要功能是与硬件 DMA 进行协作，读取当前
|
||
DMA 已经搬运完成的数据包，并将缓冲区还给 DMA。 然后再将接收完成的数据包交给协议栈任务进行处理</p>
|
||
</dd></dl>
|
||
</li><li class="- topic/li li" data-ofbid="d108157e160__20250121171544">
|
||
<dl class="- topic/dl dl simple" data-ofbid="d108157e162__20250121171544"><dt class="- topic/dt dt dlterm" data-ofbid="d108157e164__20250121171544">协议栈处理任务</dt><dd class="- topic/dd dd">
|
||
<p class="- topic/p p" data-ofbid="d108157e168__20250121171544">协议栈处理任务为事件驱动型任务，为以太网驱动的核心。事件的来源可以是网络包接收任务、
|
||
超时事件、也可以是协议栈自身发出的请求。主要处理数据包的解包、封包、TCP/IP 协议等</p>
|
||
</dd></dl>
|
||
</li></ul>
|
||
<div class="- topic/div div section" id="id__id7"><strong class="+ topic/ph hi-d/b ph b">初始化流程</strong>
|
||
<p class="- topic/p p" data-ofbid="d108157e177__20250121171544">MAC 模块初始化一般发生在协议栈初始化之后，驱动层通过 netif_add 接口将 ethernetif_init 传入，并在设置完 LwIP 属性之后调用
|
||
ethernetif_init 接口，然后开始执行模块的初始化流程</p><figure class="- topic/fig fig fignone" data-ofbid="d108157e179__20250121171544"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" src="../../../images/mac/mac-init.png" width="96" alt="mac-init"/></div><br/></figure></div>
|
||
<div class="- topic/div div section" id="id__id8"><strong class="+ topic/ph hi-d/b ph b">启动流程</strong>
|
||
<p class="- topic/p p" data-ofbid="d108157e188__20250121171544">MAC 初始化完成后，不会直接使能 MAC 的发送与接收，而是当 PHY 自协商完成后，才需要打开 MAC 的全部功能。</p><figure class="- topic/fig fig fignone" data-ofbid="d108157e190__20250121171544"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" src="../../../images/mac/mac-startup.png" width="96" alt="mac-startup"/></div><br/></figure>
|
||
</div>
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||
<div class="- topic/div div section" id="id__id9"><strong class="+ topic/ph hi-d/b ph b">发送流程</strong>
|
||
<p class="- topic/p p" data-ofbid="d108157e201__20250121171544">当有数据需要发送时，LwIP 协议栈会组织好待发送的网卡数据包，然后调用 low_level_output 接口
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||
完成数据包的发送过程</p><p class="- topic/p p" data-ofbid="d108157e203__20250121171544">网卡数据包实际的发送过程只有一种，就是 MAC 内部集成的 DMA 通过发送描述符将数据包发送至网卡 内部的
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||
FIFO(先入先出缓冲区)，再由 FIFO 将数据包发送至 PHY 芯片。因此实际的数据包发送过程一 般都是组装 DMA 发送描述符的过程</p><figure class="- topic/fig fig fignone" data-ofbid="d108157e205__20250121171544"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" src="../../../images/mac/mac-send.png" width="96" alt="mac-send"/></div><br/></figure>
|
||
</div>
|
||
<div class="- topic/div div section" id="id__id10"><strong class="+ topic/ph hi-d/b ph b">接收流程</strong>
|
||
<p class="- topic/p p" data-ofbid="d108157e215__20250121171544">与发送过程类似，接收过程也需要完全依赖 MAC 内部的 DMA。当一帧完整的以太网数据帧到来时，DMA 将从 MAC 内部的 FIFO
|
||
中将数据拷贝至接收描述符描述的缓存地址中，当 DMA 传输完成时，会触发一个 DMA
|
||
接收完成中断，软件获取到这一中断事件后，就需要根据当前的描述符找到当前网卡的缓存，并将 以太网数据帧取出。并将 DMA 描述符归还至 DMA</p><figure class="- topic/fig fig fignone" data-ofbid="d108157e217__20250121171544"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" src="../../../images/mac/mac-receive.png" width="96" alt="mac-receive"/></div><br/></figure>
|
||
</div>
|
||
<div class="- topic/div div section" id="id__id11"><strong class="+ topic/ph hi-d/b ph b">中断流程</strong>
|
||
<p class="- topic/p p" data-ofbid="d108157e227__20250121171544">能触发 MAC 中断的事件很多，但在实时系统中一般只开启 MAC 的 DMA 接收完成中断。因此 MAC 的中断
|
||
流程设计会相对较简单，只判断是否是接收中断，然后如果是接收中断就释放一个信号量通知网卡 数据包输入任务去 DMA 缓存中取数据</p><figure class="- topic/fig fig fignone" data-ofbid="d108157e229__20250121171544"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" src="../../../images/mac/mac-interrupt.png" width="144" alt="mac-interrupt"/></div><br/></figure></div>
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