netdev - Re: [PATCH net 1/2] s390/qeth: update cached link

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Message-ID: <dae87dee-67b0-30ce-91c0-a81eae8ec66f@linux.ibm.com>
Date:   Thu, 4 Aug 2022 10:53:33 +0200
From:   Alexandra Winter <wintera@...ux.ibm.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, Heiko Carstens <hca@...ux.ibm.com>,
        Thorsten Winkler <twinkler@...ux.ibm.com>
Subject: Re: [PATCH net 1/2] s390/qeth: update cached link_info for ethtool

On 03.08.22 17:19, Andrew Lunn wrote:
> On Wed, Aug 03, 2022 at 04:40:14PM +0200, Alexandra Winter wrote:
>> Speed, duplex, port type and link mode can change, after the physical link
>> goes down (STOPLAN) or the card goes offline
> 
> If the link is down, speed, and duplex are meaningless. They should be
> set to DUPLEX_UNKNOWN, SPEED_UNKNOWN. There is no PORT_UNKNOWN, but
> generally, it does not change on link up, so you could set this
> depending on the hardware type.
> 
> 	Andrew

Thank you Andrew for the review. I fully understand your point.
I would like to propose that I put that on my ToDo list and fix
that in a follow-on patch to net-next.

The fields in the link_info control blocks are used today to generate
other values (e.g. supported speed) which will not work with *_UNKNOWN,
so the follow-on patch will be more than just 2 lines.
These 2 patches under review are required to solve a recovery problem, 
so I would like them to go to net asap.

Would that be ok for you?