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

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Message-ID: <e57e3748-6ee5-42d5-8715-ec652fc6310f@lunn.ch>
Date: Thu, 1 Aug 2024 14:36:49 +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 08:33:38PM +0800, Jijie Shao wrote:
> 
> on 2024/8/1 20:18, Andrew Lunn wrote:
> > 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
> 
> Hi:
> I did the following test on my device:
> 
> insmod hibmcge.ko
> hibmcge: no symbol version for module_layout
> hibmcge: loading out-of-tree module taints kernel.
> hibmcge: module verification failed: signature and/or required key missing - tainting kernel
> hibmcge 0000:83:00.1: enabling device (0140 -> 0142)
> Generic PHY mii-0000:83:00.1:02: attached PHY driver (mii_bus:phy_addr=mii-0000:83:00.1:02, irq=POLL)
> hibmcge 0000:83:00.1 enp131s0f1: renamed from eth0
> IPv6: ADDRCONF(NETDEV_CHANGE): enp131s0f1: link becomes ready
> hibmcge 0000:83:00.1: link up!
> 
> ifconfig enp131s0f1 hw ether FF:FF:FF:FF:FF:FF
> 
> ip a
> 6: enp131s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
>     link/ether ff:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff permaddr 08:02:00:00:08:08
> ifconfig enp131s0f1 up
> ifconfig enp131s0f1 down up
> SIOCSIFFLAGS: Cannot assign requested address
> hibmcge 0000:83:00.1: link down!
> 
> uname -a
> Linux localhost.localdomain 6.4.0+ #1 SMP Fri Mar 15 14:44:20 CST 2024 aarch64 aarch64 aarch64 GNU/Linux
> 
> 
> 
> So I'm not sure what's wrong. I also implemented ndo_validate_addr by eth_validate_addr.

I agree. I don't see a test. Please could you include a patch to
dev_set_mac_address() to validate the address there before calling
into the driver. It might also be worth a search to see if anybody
else has tried this before, and failed. There might be a good reason
you cannot validate it.

	Andrew