linux-kernel - Re: [RFC PATCH net-next 05/10] net: hibmcge: Implement some .ndo functions

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Message-ID: <ffd2d708-60fb-4049-8c1b-fcfe43a78d57@lunn.ch>
Date: Thu, 1 Aug 2024 14:18:26 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Jijie Shao <shaojijie@...wei.com>
Cc: yisen.zhuang@...wei.com, salil.mehta@...wei.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	horms@...nel.org, shenjian15@...wei.com, wangpeiyang1@...wei.com,
	liuyonglong@...wei.com, sudongming1@...wei.com,
	xujunsheng@...wei.com, shiyongbang@...wei.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 05/10] net: hibmcge: Implement some .ndo
 functions

On Thu, Aug 01, 2024 at 05:13:33PM +0800, Jijie Shao wrote:
> 
> on 2024/8/1 8:51, Andrew Lunn wrote:
> > > +static int hbg_net_set_mac_address(struct net_device *dev, void *addr)
> > > +{
> > > +	struct hbg_priv *priv = netdev_priv(dev);
> > > +	u8 *mac_addr;
> > > +
> > > +	mac_addr = ((struct sockaddr *)addr)->sa_data;
> > > +	if (ether_addr_equal(dev->dev_addr, mac_addr))
> > > +		return 0;
> > > +
> > > +	if (!is_valid_ether_addr(mac_addr))
> > > +		return -EADDRNOTAVAIL;
> > How does the core pass you an invalid MAC address?
> 
> According to my test,
> in the 6.4 rc4 kernel version, invalid mac address is allowed to be configured.
> An error is reported only when ifconfig ethx up.

Ah, interesting.

I see a test in __dev_open(), which is what you are saying here. But i
would also expect a test in rtnetlink, or maybe dev_set_mac_address().
We don't want every driver having to repeat this test in their
.ndo_set_mac_address, when it could be done once in the core.

	Andrew