vswitchd与datapath交互流程

vswitchd与datapath通过dp_genl_families实现对datapath，vport，flow等结构的增删改查。

image.png

如上图而言，就是vswitchd与datapath交互的部分

dp_genl_families

static struct genl_family *dp_genl_families[] = {
    &dp_datapath_genl_family,
    &dp_vport_genl_family,
    &dp_flow_genl_family,
    &dp_packet_genl_family,
};
//从内核解除注册
static void dp_unregister_genl(int n_families)
{
    int i;

    for (i = 0; i < n_families; i++)
        genl_unregister_family(dp_genl_families[i]);
}
//向内核注册函数族
static int dp_register_genl(void)
{
    int err;
    int i;

    for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {

        err = genl_register_family(dp_genl_families[i]);
        if (err)
            goto error;
    }

    return 0;

error:
    dp_unregister_genl(i);
    return err;
}
//init
static int __init dp_init(void)
{
    ...
    err = dp_register_genl();
    if (err < 0)
        goto error_unreg_notifier;
    ...
}

static void dp_cleanup(void)
{
    dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
    ...
}

• 下面介绍几个典型交互过程，通过这个图再去看代码就会简单一些。

datapath

image.png

vport

image.png

flow

image.png