netdev - Re: [PATCH v2 net-next 1/4] net/ethtool: add netlink interface for the PLCA RS

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Date:   Mon, 5 Dec 2022 10:37:25 +0100
From:   Piergiorgio Beruto <piergiorgio.beruto@...il.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Oleksij Rempel <o.rempel@...gutronix.de>
Subject: Re: [PATCH v2 net-next 1/4] net/ethtool: add netlink interface for
 the PLCA RS

On Mon, Dec 05, 2022 at 09:28:51AM +0000, Russell King (Oracle) wrote:
> On Mon, Dec 05, 2022 at 02:41:35AM +0100, Piergiorgio Beruto wrote:
> > +int ethnl_set_plca_cfg(struct sk_buff *skb, struct genl_info *info)
> > +{
> > +	struct ethnl_req_info req_info = {};
> > +	struct nlattr **tb = info->attrs;
> > +	const struct ethtool_phy_ops *ops;
> > +	struct phy_plca_cfg plca_cfg;
> > +	struct net_device *dev;
> > +
> > +	bool mod = false;
> > +	int ret;
> > +
> > +	ret = ethnl_parse_header_dev_get(&req_info,
> > +					 tb[ETHTOOL_A_PLCA_HEADER],
> > +					 genl_info_net(info), info->extack,
> > +					 true);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	dev = req_info.dev;
> > +
> > +	// check that the PHY device is available and connected
> > +	if (!dev->phydev) {
> > +		ret = -EOPNOTSUPP;
> > +		goto out;
> > +	}
> 
> This check should really be done under the RTNL lock. phydevs can come
> and go with SFP cages.
> 
> > +
> > +	rtnl_lock();
Good point Russell, I'll fix that. And I wish to seize the opportunity
to remark that the same problem may be present in cabletest.c
(see below).

Maybe we should post a patch to fix that?

Thanks,
Piergiorgio

int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info)
{
	struct ethnl_req_info req_info = {};
	const struct ethtool_phy_ops *ops;
	struct nlattr **tb = info->attrs;
	struct net_device *dev;
	int ret;

	ret = ethnl_parse_header_dev_get(&req_info,
					 tb[ETHTOOL_A_CABLE_TEST_HEADER],
					 genl_info_net(info), info->extack,
					 true);
	if (ret < 0)
		return ret;

	dev = req_info.dev;
	if (!dev->phydev) {
		ret = -EOPNOTSUPP;
		goto out_dev_put;
	}

	rtnl_lock();