linux-kernel - Re: [RFC] net: hsr: Provide RedBox support

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Date: Wed, 28 Feb 2024 20:58:07 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Lukasz Majewski <lukma@...x.de>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>, Andrew Lunn <andrew@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
	Tristram.Ha@...rochip.com,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Paolo Abeni <pabeni@...hat.com>,
	Ravi Gunasekaran <r-gunasekaran@...com>,
	Simon Horman <horms@...nel.org>,
	Wojciech Drewek <wojciech.drewek@...el.com>,
	Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
	Murali Karicheri <m-karicheri2@...com>,
	Ziyang Xuan <william.xuanziyang@...wei.com>,
	Kristian Overskeid <koverskeid@...il.com>,
	Matthieu Baerts <matttbe@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC] net: hsr: Provide RedBox support

On Wed, Feb 28, 2024 at 04:07:35PM +0100, Lukasz Majewski wrote:
>  void hsr_debugfs_rename(struct net_device *dev)
>  {
> @@ -95,6 +114,19 @@ void hsr_debugfs_init(struct hsr_priv *priv, struct net_device *hsr_dev)
>  		priv->node_tbl_root = NULL;
>  		return;
>  	}
> +
> +	if (!priv->redbox)
> +		return;
> +
> +	de = debugfs_create_file("proxy_node_table", S_IFREG | 0444,
> +				 priv->node_tbl_root, priv,
> +				 &hsr_proxy_node_table_fops);
> +	if (IS_ERR(de)) {
> +		pr_err("Cannot create hsr proxy node_table file\n");

Debugfs functions are not supposed to be checked.  This will print a
warning when CONFIG_DEBUGFS is disabled.  Just leave all the clean up
out.  If debugfs can't allocate enough memory then probably this one
debugfs_remove() is not going to save us.

> +		debugfs_remove(priv->node_tbl_root);
> +		priv->node_tbl_root = NULL;
> +		return;
> +	}
>  }
>  
>  /* hsr_debugfs_term - Tear down debugfs intrastructure

[ snip ]

> @@ -545,8 +558,8 @@ static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
>  };
>  
>  int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
> -		     unsigned char multicast_spec, u8 protocol_version,
> -		     struct netlink_ext_ack *extack)
> +		     struct net_device *interlink, unsigned char multicast_spec,
> +		     u8 protocol_version, struct netlink_ext_ack *extack)
>  {
>  	bool unregister = false;
>  	struct hsr_priv *hsr;
> @@ -555,6 +568,7 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
>  	hsr = netdev_priv(hsr_dev);
>  	INIT_LIST_HEAD(&hsr->ports);
>  	INIT_LIST_HEAD(&hsr->node_db);
> +	INIT_LIST_HEAD(&hsr->proxy_node_db);
>  	spin_lock_init(&hsr->list_lock);
>  
>  	eth_hw_addr_set(hsr_dev, slave[0]->dev_addr);
> @@ -615,6 +629,18 @@ int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
>  	if (res)
>  		goto err_unregister;
>  
> +	if (interlink) {
> +		res = hsr_add_port(hsr, interlink, HSR_PT_INTERLINK, extack);
> +		if (res)
> +			goto err_unregister;

You need to add the iterlink port to hsr_del_ports() to avoid a leak in
the remove() function.

regards,
dan carpenter

> +
> +		hsr->redbox = true;
> +		ether_addr_copy(hsr->macaddress_redbox, interlink->dev_addr);
> +		timer_setup(&hsr->prune_proxy_timer, hsr_prune_proxy_nodes, 0);
> +		mod_timer(&hsr->prune_proxy_timer,
> +			  jiffies + msecs_to_jiffies(PRUNE_PROXY_PERIOD));
> +	}
> +
>  	hsr_debugfs_init(hsr, hsr_dev);
>  	mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
>