netdev - Re: [PATCH v2 RFC 2/5] ethtool: switch back from ethtool_keee to ethtool

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Message-ID: <e67d3de9-65b2-4dac-8b87-2bbf09ea3c21@gmail.com>
Date: Sun, 7 Jan 2024 18:10:52 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: Russell King <rmk+kernel@...linux.org.uk>,
 Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, David Miller <davem@...emloft.net>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 RFC 2/5] ethtool: switch back from ethtool_keee to
 ethtool_eee for ioctl

On 07.01.2024 17:23, Andrew Lunn wrote:
>>  static int ethtool_get_eee(struct net_device *dev, char __user *useraddr)
>>  {
>> -	struct ethtool_keee edata;
>> +	struct ethtool_keee keee;
>> +	struct ethtool_eee eee;
>>  	int rc;
>>  
>>  	if (!dev->ethtool_ops->get_eee)
>>  		return -EOPNOTSUPP;
>>  
>> -	memset(&edata, 0, sizeof(struct ethtool_keee));
>> -	edata.cmd = ETHTOOL_GEEE;
>> -	rc = dev->ethtool_ops->get_eee(dev, &edata);
> 
> With the old code, the edata passed to the driver has edata.cmd set to
> ETHTOOL_GEEE.
> 
>> -
>> +	memset(&keee, 0, sizeof(keee));
>> +	rc = dev->ethtool_ops->get_eee(dev, &keee);
> 
> Here, its not set. I don't know if it makes a difference, if any
> driver actually looks at it. If you reviewed all the drivers and think
> this is O.K, i would suggest a comment in the commit message
> explaining this.
> 
I saw your comment on patch 3, just to explain this a little bit more:
The cmd field is set for ioctl only (by userspace ethtool), it's not
populated for netlink. Therefore no driver should use it.
Also it wouldn't make sense. If get_eee() is called, then cmd must
have been set to ETHTOOL_GEEE (for ioctl). See __dev_ethtool().

We could even remove setting cmd here. Userspace ethtool isn't
interested in the cmd field of the GEEE response.

-	if (copy_to_user(useraddr, &edata, sizeof(edata)))
+	keee_to_eee(&eee, &keee);
+	eee.cmd = ETHTOOL_GEEE;
+	if (copy_to_user(useraddr, &eee, sizeof(eee)))
 		return -EFAULT;

> 	   Andrew

Heiner