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Openvswitch source code(1)
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<div class="post-description">In this post, I try to study the soruce code of openvswitch to learn how does the openvswitch kernel module works.</div>
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<div class="post-body" itemprop="articleBody"><h1 id="Preface"><a href="#Preface" class="headerlink" title="Preface"></a>Preface</h1><p>Openvswitch support two modes for user to config, user mode and kernel mode.<br>we will discuss the kernel mode in this article.</p>
<p>Software version: openvswitch v.20</p>
<span id="more"></span>
<h1 id="SourceCode"><a href="#SourceCode" class="headerlink" title="SourceCode"></a>SourceCode</h1><h2 id="datapath-c"><a href="#datapath-c" class="headerlink" title="datapath.c"></a>datapath.c</h2><p>This file is the main part of the kernel module and it will be compiled to the datapath.ko.</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">module_init(dp_init);</span><br><span class="line">module_exit(dp_cleanup);</span><br><span class="line"></span><br><span class="line">MODULE_DESCRIPTION("Open vSwitch switching datapath");</span><br><span class="line">MODULE_LICENSE("GPL");</span><br><span class="line">MODULE_VERSION(VERSION);</span><br></pre></td></tr></table></figure>
<p>The kernel will call its init function <code>dp_init</code> after the kernel module has been loaded.</p>
<p>The following is the work flow of the <code>dp_init</code>.</p>
<ul>
<li>ovs_workqueues_init()</li>
<li>ovs_flow_init()</li>
<li>ovs_vport_init</li>
<li>register_pernet_device(&ovs_net_ops);</li>
<li>register_netdevice_notifier(&ovs_dp_device_notifier);</li>
<li>dp_register_genl();</li>
<li>schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);</li>
</ul>
<h3 id="ovs-workqueues-init"><a href="#ovs-workqueues-init" class="headerlink" title="ovs_workqueues_init"></a>ovs_workqueues_init</h3><p><strong>workqueue.c</strong></p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="class"><span class="keyword">struct</span> <span class="title">task_struct</span> *<span class="title">workq_thread</span>;</span></span><br><span class="line">spin_lock_init(&wq_lock);</span><br><span class="line">INIT_LIST_HEAD(&workq);</span><br><span class="line">init_waitqueue_head(&more_work);</span><br><span class="line"></span><br><span class="line">workq_thread = kthread_create(worker_thread, <span class="literal">NULL</span>, <span class="string">"ovs_workq"</span>);</span><br><span class="line"><span class="keyword">if</span> (IS_ERR(workq_thread))</span><br><span class="line"><span class="keyword">return</span> PTR_ERR(workq_thread);</span><br><span class="line"></span><br><span class="line">wake_up_process(workq_thread);</span><br></pre></td></tr></table></figure>
<ul>
<li>Initail the worker queue.</li>
<li> Create a kernel thread and the handler is <strong>worker_thread</strong></li>
<li>start the kernel thread by calling <strong>wake_up_process</strong></li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="type">int</span> <span class="title function_">worker_thread</span><span class="params">(<span class="type">void</span> *dummy)</span></span><br><span class="line">{</span><br><span class="line"> <span class="keyword">for</span> (;;) {</span><br><span class="line"> wait_event_interruptible(more_work,</span><br><span class="line"> (kthread_should_stop() || !list_empty(&workq)));</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (kthread_should_stop())</span><br><span class="line"> <span class="keyword">break</span>;</span><br><span class="line"></span><br><span class="line"> run_workqueue();</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li>wait_event_interruptible make the thread hibernation and add into the queue more_work.</li>
<li>The thread will wake up until the condition “kthread_should_stop() || !list_empty(&workq))” is true.</li>
<li>It will call the <code>run_workqueue</code> after it wake up.</li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="type">void</span> <span class="title function_">run_workqueue</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">{</span><br><span class="line"> spin_lock_irq(&wq_lock);</span><br><span class="line"> <span class="keyword">while</span> (!list_empty(&workq)) {</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">work_struct</span> *<span class="title">work</span> =</span> list_entry(workq.next,</span><br><span class="line"> <span class="keyword">struct</span> work_struct, entry);</span><br><span class="line"></span><br><span class="line"> <span class="type">work_func_t</span> f = work->func;</span><br><span class="line"> list_del_init(workq.next);</span><br><span class="line"> current_work = work;</span><br><span class="line"> spin_unlock_irq(&wq_lock);</span><br><span class="line"></span><br><span class="line"> work_clear_pending(work);</span><br><span class="line"> f(work);</span><br><span class="line"></span><br><span class="line"> BUG_ON(in_interrupt());</span><br><span class="line"> spin_lock_irq(&wq_lock);</span><br><span class="line"> current_work = <span class="literal">NULL</span>;</span><br><span class="line"> }</span><br><span class="line"> spin_unlock_irq(&wq_lock);</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ul>
<li>Get the work from the workq list and call the fucntion.</li>
</ul>
<h3 id="ovs-flow-init"><a href="#ovs-flow-init" class="headerlink" title="ovs_flow_init"></a>ovs_flow_init</h3><p><strong>flow.c</strong></p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* Initializes the flow module.</span></span><br><span class="line"><span class="comment"> * Returns zero if successful or a negative error code. */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">ovs_flow_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">{</span><br><span class="line"> BUILD_BUG_ON(__alignof__(<span class="keyword">struct</span> sw_flow_key) % __alignof__(<span class="type">long</span>));</span><br><span class="line"> BUILD_BUG_ON(<span class="keyword">sizeof</span>(<span class="keyword">struct</span> sw_flow_key) % <span class="keyword">sizeof</span>(<span class="type">long</span>));</span><br><span class="line"></span><br><span class="line"> flow_cache = kmem_cache_create(<span class="string">"sw_flow"</span>, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> sw_flow), <span class="number">0</span>,</span><br><span class="line"> <span class="number">0</span>, <span class="literal">NULL</span>);</span><br><span class="line"> <span class="keyword">if</span> (flow_cache == <span class="literal">NULL</span>)</span><br><span class="line"> <span class="keyword">return</span> -ENOMEM;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ul>
<li>use the <code>kmem_cache_create</code> to create a kernel cache with size <code>sw_flow</code></li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">sw_flow</span> {</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">rcu_head</span> <span class="title">rcu</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">hlist_node</span> <span class="title">hash_node</span>[2];</span></span><br><span class="line"> u32 hash;</span><br><span class="line"></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">sw_flow_key</span> <span class="title">key</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">sw_flow_key</span> <span class="title">unmasked_key</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">sw_flow_mask</span> *<span class="title">mask</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">sw_flow_actions</span> __<span class="title">rcu</span> *<span class="title">sf_acts</span>;</span></span><br><span class="line"></span><br><span class="line"> <span class="type">spinlock_t</span> lock; <span class="comment">/* Lock for values below. */</span></span><br><span class="line"> <span class="type">unsigned</span> <span class="type">long</span> used; <span class="comment">/* Last used time (in jiffies). */</span></span><br><span class="line"> u64 packet_count; <span class="comment">/* Number of packets matched. */</span></span><br><span class="line"> u64 byte_count; <span class="comment">/* Number of bytes matched. */</span></span><br><span class="line"> u8 tcp_flags; <span class="comment">/* Union of seen TCP flags. */</span></span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<ul>
<li>This struct store the info of each flow, including count, flow_key and flow_mask.</li>
</ul>
<h3 id="ovs-vport-init"><a href="#ovs-vport-init" class="headerlink" title="ovs_vport_init"></a>ovs_vport_init</h3><p><strong>vport.c”</strong></p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * ovs_vport_init - initialize vport subsystem</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * Called at module load time to initialize the vport subsystem.</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">ovs_vport_init</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">{</span><br><span class="line"> dev_table = kzalloc(VPORT_HASH_BUCKETS * <span class="keyword">sizeof</span>(<span class="keyword">struct</span> hlist_head),</span><br><span class="line"> GFP_KERNEL);</span><br><span class="line"> <span class="keyword">if</span> (!dev_table)</span><br><span class="line"> <span class="keyword">return</span> -ENOMEM;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li>Use <code>kzalloc</code> malloc the memory from kernel.</li>
</ul>
<h3 id="register-pernet-device-amp-ovs-net-ops"><a href="#register-pernet-device-amp-ovs-net-ops" class="headerlink" title="register_pernet_device(&ovs_net_ops)"></a>register_pernet_device(&ovs_net_ops)</h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">register_pernet_device(&ovs_net_ops);</span><br></pre></td></tr></table></figure>
<ul>
<li>Register a network device <code>ovs_net_ops</code></li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="class"><span class="keyword">struct</span> <span class="title">pernet_operations</span> <span class="title">ovs_net_ops</span> =</span> {</span><br><span class="line"> .init = ovs_init_net,</span><br><span class="line"> .<span class="built_in">exit</span> = ovs_exit_net,</span><br><span class="line"> .id = &ovs_net_id,</span><br><span class="line"> .size = <span class="keyword">sizeof</span>(<span class="keyword">struct</span> ovs_net),</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<ul>
<li>ovs_net_ops inherent from <code>pernet_operations</code>, it should implement some function (init, exit)</li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="type">int</span> __net_init <span class="title function_">ovs_init_net</span><span class="params">(<span class="keyword">struct</span> net *net)</span></span><br><span class="line">{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">ovs_net</span> *<span class="title">ovs_net</span> =</span> net_generic(net, ovs_net_id);</span><br><span class="line"></span><br><span class="line"> INIT_LIST_HEAD(&ovs_net->dps);</span><br><span class="line"> INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li>Use <code>net_generic</code> get the pointer to ovs_net.</li>
<li>Use <code>INIT_WORK</code> to create a worker and set the function (dp_notify_work) as its work.</li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">ovs_net</span> {</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">list_head</span> <span class="title">dps</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">vport_net</span> <span class="title">vport_net</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">work_struct</span> <span class="title">dp_notify_work</span>;</span></span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<ul>
<li>need to study later.</li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">void</span> <span class="title function_">ovs_dp_notify_wq</span><span class="params">(<span class="keyword">struct</span> work_struct *work)</span></span><br><span class="line">{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">ovs_net</span> *<span class="title">ovs_net</span> =</span> container_of(work, <span class="keyword">struct</span> ovs_net, dp_notify_work);</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">datapath</span> *<span class="title">dp</span>;</span></span><br><span class="line"></span><br><span class="line"> ovs_lock();</span><br><span class="line"> list_for_each_entry(dp, &ovs_net->dps, list_node) {</span><br><span class="line"> <span class="type">int</span> i;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < DP_VPORT_HASH_BUCKETS; i++) {</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">vport</span> *<span class="title">vport</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">hlist_node</span> *<span class="title">n</span>;</span></span><br><span class="line"></span><br><span class="line"> hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) {</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">netdev_vport</span> *<span class="title">netdev_vport</span>;</span></span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (vport->ops->type != OVS_VPORT_TYPE_NETDEV)</span><br><span class="line"> <span class="keyword">continue</span>;</span><br><span class="line"></span><br><span class="line"> netdev_vport = netdev_vport_priv(vport);</span><br><span class="line"> <span class="keyword">if</span> (netdev_vport->dev->reg_state == NETREG_UNREGISTERED ||</span><br><span class="line"> netdev_vport->dev->reg_state == NETREG_UNREGISTERING)</span><br><span class="line"> dp_detach_port_notify(vport);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> ovs_unlock();</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ul>
<li>search datapathes and list all its vport.</li>
<li>Delete the vport if its status is <code>UNREGISTERED</code> of <code>UNREGISTERING</code>.</li>
</ul>
<h3 id="register-netdevice-notifier"><a href="#register-netdevice-notifier" class="headerlink" title="register_netdevice_notifier"></a>register_netdevice_notifier</h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">register_netdevice_notifier(&ovs_dp_device_notifier);</span><br></pre></td></tr></table></figure>
<ul>
<li>Register the network notification chain, it will call <code>ovs_dp_device_notifier</code> when event occur.</li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">notifier_block</span> <span class="title">ovs_dp_device_notifier</span> =</span> {</span><br><span class="line"> .notifier_call = dp_device_event</span><br><span class="line">};</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ul>
<li><code>ovs_dp_device_notifier</code> contains a function pointer which point to <code>dp_device_event</code>.</li>
<li>This function will be call when the notification has occur.</li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="type">int</span> <span class="title function_">dp_device_event</span><span class="params">(<span class="keyword">struct</span> notifier_block *unused, <span class="type">unsigned</span> <span class="type">long</span> event,</span></span><br><span class="line"><span class="params"> <span class="type">void</span> *ptr)</span></span><br><span class="line">{</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">ovs_net</span> *<span class="title">ovs_net</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">net_device</span> *<span class="title">dev</span> =</span> ptr;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">vport</span> *<span class="title">vport</span> =</span> <span class="literal">NULL</span>;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (!ovs_is_internal_dev(dev))</span><br><span class="line"> vport = ovs_netdev_get_vport(dev);</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (!vport)</span><br><span class="line"> <span class="keyword">return</span> NOTIFY_DONE;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (event == NETDEV_UNREGISTER) {</span><br><span class="line"> ovs_net = net_generic(dev_net(dev), ovs_net_id);</span><br><span class="line"> queue_work(&ovs_net->dp_notify_work);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> NOTIFY_DONE;</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ul>
<li>Need to study.</li>
</ul>
<h3 id="dp-register-genl"><a href="#dp-register-genl" class="headerlink" title="dp_register_genl"></a>dp_register_genl</h3><p><strong>datapath.c</strong></p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="type">int</span> <span class="title function_">dp_register_genl</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">{</span><br><span class="line"> <span class="type">int</span> n_registered;</span><br><span class="line"> <span class="type">int</span> err;</span><br><span class="line"> <span class="type">int</span> i;</span><br><span class="line"></span><br><span class="line"> n_registered = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">for</span> (i = <span class="number">0</span>; i < ARRAY_SIZE(dp_genl_families); i++) {</span><br><span class="line"> <span class="type">const</span> <span class="class"><span class="keyword">struct</span> <span class="title">genl_family_and_ops</span> *<span class="title">f</span> =</span> &dp_genl_families[i];</span><br><span class="line"></span><br><span class="line"> err = genl_register_family_with_ops(f->family, f->ops,</span><br><span class="line"> f->n_ops);</span><br><span class="line"> <span class="keyword">if</span> (err)</span><br><span class="line"> <span class="keyword">goto</span> error;</span><br><span class="line"> n_registered++;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (f->group) {</span><br><span class="line"> err = genl_register_mc_group(f->family, f->group);</span><br><span class="line"> <span class="keyword">if</span> (err)</span><br><span class="line"> <span class="keyword">goto</span> error;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">error:</span><br><span class="line"> dp_unregister_genl(n_registered);</span><br><span class="line"> <span class="keyword">return</span> err;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li>Register four types of gereric netlink (datapath, vport, flow, packet).</li>
<li>You can see the detail info in <strong>dp_genl_families</strong></li>
<li><code>genl_register_family_with_ops</code> : register a generic netlink family with ops.</li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="type">const</span> <span class="class"><span class="keyword">struct</span> <span class="title">genl_family_and_ops</span> <span class="title">dp_genl_families</span>[] =</span> {</span><br><span class="line"> { &dp_datapath_genl_family,</span><br><span class="line"> dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),</span><br><span class="line"> &ovs_dp_datapath_multicast_group },</span><br><span class="line"> { &dp_vport_genl_family,</span><br><span class="line"> dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),</span><br><span class="line"> &ovs_dp_vport_multicast_group },</span><br><span class="line"> { &dp_flow_genl_family,</span><br><span class="line"> dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),</span><br><span class="line"> &ovs_dp_flow_multicast_group },</span><br><span class="line"> { &dp_packet_genl_family,</span><br><span class="line"> dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),</span><br><span class="line"> <span class="literal">NULL</span> },</span><br><span class="line">};</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">genl_family_and_ops</span> {</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">genl_family</span> *<span class="title">family</span>;</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">genl_ops</span> *<span class="title">ops</span>;</span></span><br><span class="line"> <span class="type">int</span> n_ops;</span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">genl_multicast_group</span> *<span class="title">group</span>;</span></span><br><span class="line">};</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ul>
<li>A genl_family_and_ops contains a pointer to its family and a pointer to its operations.</li>
</ul>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">static</span> <span class="class"><span class="keyword">struct</span> <span class="title">genl_family</span> <span class="title">dp_datapath_genl_family</span> =</span> {</span><br><span class="line"> .id = GENL_ID_GENERATE,</span><br><span class="line"> .hdrsize = <span class="keyword">sizeof</span>(<span class="keyword">struct</span> ovs_header),</span><br><span class="line"> .name = OVS_DATAPATH_FAMILY,</span><br><span class="line"> .version = OVS_DATAPATH_VERSION,</span><br><span class="line"> .maxattr = OVS_DP_ATTR_MAX,</span><br><span class="line"> .netnsok = <span class="literal">true</span>,</span><br><span class="line"> SET_PARALLEL_OPS</span><br><span class="line">};</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="class"><span class="keyword">struct</span> <span class="title">genl_ops</span> <span class="title">dp_datapath_genl_ops</span>[] =</span> {</span><br><span class="line"> { .cmd = OVS_DP_CMD_NEW,</span><br><span class="line"> .flags = GENL_ADMIN_PERM, <span class="comment">/* Requires CAP_NET_ADMIN privilege. */</span></span><br><span class="line"> .policy = datapath_policy,</span><br><span class="line"> .doit = ovs_dp_cmd_new</span><br><span class="line"> },</span><br><span class="line"> { .cmd = OVS_DP_CMD_DEL,</span><br><span class="line"> .flags = GENL_ADMIN_PERM, <span class="comment">/* Requires CAP_NET_ADMIN privilege. */</span></span><br><span class="line"> .policy = datapath_policy,</span><br><span class="line"> .doit = ovs_dp_cmd_del</span><br><span class="line"> },</span><br><span class="line"> { .cmd = OVS_DP_CMD_GET,</span><br><span class="line"> .flags = <span class="number">0</span>, <span class="comment">/* OK for unprivileged users. */</span></span><br><span class="line"> .policy = datapath_policy,</span><br><span class="line"> .doit = ovs_dp_cmd_get,</span><br><span class="line"> .dumpit = ovs_dp_cmd_dump</span><br><span class="line"> },</span><br><span class="line"> { .cmd = OVS_DP_CMD_SET,</span><br><span class="line"> .flags = GENL_ADMIN_PERM, <span class="comment">/* Requires CAP_NET_ADMIN privilege. */</span></span><br><span class="line"> .policy = datapath_policy,</span><br><span class="line"> .doit = ovs_dp_cmd_set,</span><br><span class="line"> },</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<ul>
<li>Take <strong>dp_datapath_genl_ops</strong> for example. when the event is <strong>OVS_DP_CMD_NEW</strong> it will call it function handler <strong>ovs_dp_cmd_new</strong>.</li>
</ul>
<h3 id="schedule-delayed-work"><a href="#schedule-delayed-work" class="headerlink" title="schedule_delayed_work"></a>schedule_delayed_work</h3><ul>
<li>Need to study</li>
</ul>
<h3 id="other"><a href="#other" class="headerlink" title="other"></a>other</h3><ul>
<li>pr_info is printk(KERN_INFO,pr_fmt(fmt), ##<strong>VA_ARGS</strong>)</li>
</ul>
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