linux-kernel - Re: [PATCH net-next v20 10/13] rtase: Implement ethtool function

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Date: Mon, 17 Jun 2024 16:07:45 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Justin Lai <justinlai0215@...ltek.com>
Cc: Jakub Kicinski <kuba@...nel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"pabeni@...hat.com" <pabeni@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"jiri@...nulli.us" <jiri@...nulli.us>,
	"horms@...nel.org" <horms@...nel.org>,
	"rkannoth@...vell.com" <rkannoth@...vell.com>,
	Ping-Ke Shih <pkshih@...ltek.com>,
	Larry Chiu <larry.chiu@...ltek.com>
Subject: Re: [PATCH net-next v20 10/13] rtase: Implement ethtool function

> > > +     strscpy(drvinfo->bus_info, pci_name(tp->pdev), 32);
> > 
> > Can you double check that overwriting these fields is actually needed?
> > I think core will fill this in for you in ethtool_get_drvinfo()
> 
> I have removed this line of code for testing. Before removing the code,
> I could obtain bus info by entering "ethtool -i". However, after removing
> the code, entering "ethtool -i" no longer retrieves the bus info.

https://elixir.bootlin.com/linux/latest/source/net/ethtool/ioctl.c#L710

	if (ops->get_drvinfo) {
		ops->get_drvinfo(dev, &rsp->info);
		if (!rsp->info.bus_info[0] && parent)
			strscpy(rsp->info.bus_info, dev_name(parent),
				sizeof(rsp->info.bus_info));

This suggests you have not set the parent device.

	Andrew