net_device.uc_promisc 字段的用途是什么？
为什么struct net_device有一个字段uc_promisc？这个字段怎么用呢？
谢谢大家！
why struct net_device has a field uc_promisc? How this field is used?
Thank you all!
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当不支持单播过滤的设备必须侦听多个单播地址时，根据
dev->uc_count和dev->uc_promisc，它会进入混杂模式。代码>.检查__dev_set_rx_mode()函数。许多设备实现
ndo_set_rx_mode()，并通过ndo_set_rx_mode()设置其单播（和多播）过滤器。对于未实现该功能的设备，Linux 将设备设置为混杂模式，并使用dev->uc_promisc跟踪该事实。因此，混杂模式有几个标志：
dev->flags & IFF_PROMISC表示设备处于混杂模式。dev->gflags & IFF_PROMISC表示用户已请求混杂模式。dev->uc_promisc表示混杂模式已启用（实际上，其引用计数已增加），因为需要在未实现ndo_set_rx_mode 的设备中监听其他单播地址()。When a device that doesn't support unicast filtering has to listen to several unicast addresses, it is put on promiscous mode, according to
dev->uc_countanddev->uc_promisc. Check the__dev_set_rx_mode()function.Many devices implement
ndo_set_rx_mode(), and set their unicast (and multicast) filters viando_set_rx_mode(). For devices that don't implement that, Linux sets the device to promiscuous mode, and keeps track of that fact withdev->uc_promisc.So there are several flags for promiscuous mode:
dev->flags & IFF_PROMISCmeans the device is in promiscuous mode.dev->gflags & IFF_PROMISCmeans the user has requested promiscuous mode.dev->uc_promiscmeans promiscuous mode has been enabled (actually, its reference count has been incremented) due to the need to listen to additional unicast address in a device that doesn't implementndo_set_rx_mode().听起来这可能是一种启用（或跟踪启用/禁用状态）混杂模式 在设备上。
It sounds like it could be a way of enabling (or tracking the enabled/disabled status of) promiscuous mode on the device.