linux-kernel - Re: [PATCH net-next v5 12/22] ethtool: provide string sets with GET

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Date:   Fri, 29 Mar 2019 07:52:16 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Michal Kubecek <mkubecek@...e.cz>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        John Linville <linville@...driver.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v5 12/22] ethtool: provide string sets with
 GET_STRSET request

Thu, Mar 28, 2019 at 10:06:07PM CET, jakub.kicinski@...ronome.com wrote:
>On Thu, 28 Mar 2019 21:43:29 +0100, Michal Kubecek wrote:
>> On Thu, Mar 28, 2019 at 11:52:56AM -0700, Jakub Kicinski wrote:
>> > On Thu, 28 Mar 2019 18:35:24 +0100, Jiri Pirko wrote:  
>> > > Thu, Mar 28, 2019 at 03:04:28PM CET, mkubecek@...e.cz wrote:  
>> > > >On Thu, Mar 28, 2019 at 02:43:13PM +0100, Jiri Pirko wrote:    
>> > > >> 
>> > > >> I don't like this. This should not be bitfield/set. This should be
>> > > >> simply nested array of enum values:
>> > > >> 
>> > > >> enum ethtool_link_mode {
>> > > >> 	ETHTOOL_LINK_MODE_10baseT_Half,
>> > > >> 	ETHTOOL_LINK_MODE_10baseT_Full,
>> > > >> 	ETHTOOL_LINK_MODE_100baseT_Half,
>> > > >> 	ETHTOOL_LINK_MODE_100baseT_Full,
>> > > >> 	ETHTOOL_LINK_MODE_1000baseT_Full,
>> > > >> };    
>> > > >
>> > > >We already have such enum. The problem with your "no string" approach is
>> > > >that it requires all userspace applications to (1) keep this enum in    
>> > > 
>> > > That is how it is usually done. UAPI defines ATTRS and values, userspace
>> > > assigns appropriate strings.  
>> > 
>> > +1 FWIW, I'm with Jiri on the string situation.  
>> 
>> And I'm still waiting for any of you to tell me how would you handle
>> private flags, stats, tests etc. without the string sets.
>> 
>> Ditching the verbose form of bit sets would be a nuisance for userspace
>> using the interface but compared to e.g. having to mix three different
>> kernel interfaces, it's just a minor problem. Ditching the static string
>> sets would mean giving up the opportunity to get rid of having to sync
>> all kinds of tables with every userspace consumer whenever a new flag is
>> introduced. Pity... but still doable. But how do you want to do without
>> the string sets which are provided by drivers?
>
>I don't think there is a disagreement about stuff which is private to
>the driver.  The strings have to be exposed there.

Yeah, there is no other way of doing that. However, please check if some
driver-specific setting cannot be moved to devlink with use of devlink
params (we have both devlink driver specific params and per-port
devlink driver specific params).