netdev - Re: [PATCH net-next 1/5] bridge: initialize port flags with switchdev defaults

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Date:   Mon, 12 Mar 2018 12:03:10 -0700
From:   Igor Mitsyanko <igor.mitsyanko.os@...ntenna.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        sergey.matyukevich.os@...ntenna.com, smaksimenko@...ntenna.com,
        ashevchenko@...ntenna.com, dlebed@...ntenna.com, jiri@...nulli.us,
        ivecera@...hat.com
Subject: Re: [PATCH net-next 1/5] bridge: initialize port flags with switchdev
 defaults

On 03/10/2018 08:32 AM, Stephen Hemminger wrote:
> Yes hardware devices may come it with different default values.
> But the user experience on Linux needs to be consistent.
> 
> Instead, it makes more sense to me for each device driver using switchdev
> to program to the values that it sees in the bridge.
> 
> Please revise this.
> 

Right, it does change default user view, setting flags instead of 
querying makes more sense then.

However there is a problem that switchdev may not support all flags that 
bridge code sets by default. For example, looking at 
spectrum_switchdev.c, it only advertises support for BR_LEARNING | 
BR_FLOOD | BR_MCAST_FLOOD.
Currently, I assume that even though some flags are shown as set by 
default on a new bridge port, some of them are not actually working in 
switchdev?