Re: [PATCH v5 net-next 1/7] net: move ethtool-related netdev state into its own struct

On Tue, 18 Jun 2024 16:05:13 -0700 David Wei wrote:

quoted

@@ -11065,6 +11065,9 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
 	dev->real_num_rx_queues = rxqs;
 	if (netif_alloc_rx_queues(dev))
 		goto free_all;
+	dev->ethtool = kzalloc(sizeof(*dev->ethtool), GFP_KERNEL_ACCOUNT);  

Why GFP_KERNEL_ACCOUNT instead of just GFP_KERNEL?

netdevs can be created by a user, think veth getting created in 
a container. So we need to account the allocated memory towards 
the memory limit of the current user.

quoted

+	if (!dev->ethtool)
+		goto free_all;
 
 	strcpy(dev->name, name);
 	dev->name_assign_type = name_assign_type;

@@ -11115,6 +11118,7 @@ void free_netdev(struct net_device *dev)
 		return;
 	}
 
+	kfree(dev->ethtool);  

dev->ethtool = NULL?

defensive programming is sometimes permitted by not encouraged :)