Re: [RFC v4 4/5] netdev: add netdev_is_upper_master
From: David Ahern <hidden>
Date: 2018-11-23 03:55:06
On 11/21/18 6:07 PM, Alexis Bauvin wrote:
quoted hunk ↗ jump to hunk
diff --git a/net/core/dev.c b/net/core/dev.c index 93243479085f..12459036d0da 100644 --- a/net/core/dev.c +++ b/net/core/dev.c@@ -7225,6 +7225,23 @@ void netdev_lower_state_changed(struct net_device *lower_dev, } EXPORT_SYMBOL(netdev_lower_state_changed); +/** + * netdev_is_upper_master - Test if a device is a master, direct or indirect, + * of another one. + * @dev: device to start looking from + * @master: device to test if master of dev + */ +bool netdev_is_upper_master(struct net_device *dev, struct net_device *master) +{ + if (!dev) + return false; + + if (dev->ifindex == master->ifindex)
dev == master should work as well without the dereference.
+ return true;
+ return netdev_is_upper_master(netdev_master_upper_dev_get(dev), master);
+}
+EXPORT_SYMBOL(netdev_is_upper_master);
+
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
const struct net_device_ops *ops = dev->netdev_ops;