netdev - Re: [PATCH net-next] ethtool: remove XCVR

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Date:   Sun, 22 Mar 2020 15:45:22 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] ethtool: remove XCVR_DUMMY entries

On 22.03.2020 15:08, Andrew Lunn wrote:
> On Sun, Mar 22, 2020 at 02:14:20PM +0100, Heiner Kallweit wrote:
>> The transceiver dummy entries are not used any longer, so remove them.
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
>> ---
>>  include/uapi/linux/ethtool.h | 3 ---
>>  1 file changed, 3 deletions(-)
>>
>> diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
>> index d586ee5e1..77721ea36 100644
>> --- a/include/uapi/linux/ethtool.h
>> +++ b/include/uapi/linux/ethtool.h
>> @@ -1673,9 +1673,6 @@ static inline int ethtool_validate_duplex(__u8 duplex)
>>  /* Which transceiver to use. */
>>  #define XCVR_INTERNAL		0x00 /* PHY and MAC are in the same package */
>>  #define XCVR_EXTERNAL		0x01 /* PHY and MAC are in different packages */
>> -#define XCVR_DUMMY1		0x02
>> -#define XCVR_DUMMY2		0x03
>> -#define XCVR_DUMMY3		0x04
> 
> Hi Heiner
> 
Hi Andrew

> We need to be careful here. This is a UAPI header. The kernel might
> not use them, but is there any user space code using them?
> 
Right. I checked ethtool and it doesn't use the dummy values.
Wherever I checked only the internal/external values are used.

In kernel last usage of the dummy values was removed 2yrs ago,
see e.g. here: https://lore.kernel.org/patchwork/patch/767218/

> A quick search found:
> 
> http://www.infradead.org/~tgr/libnl/doc/api/ethtool_8c_source.html
> 
I checked here http://git.infradead.org/users/tgr/libnl.git and there
hasn't been such an ethtool.c file for ages.

> 	Andrew
> 
Heiner