netdev - Re: [patch net-next RFC 04/12] dsa: set devlink port attrs for dsa ports

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Date:   Fri, 18 May 2018 20:11:49 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>, Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, idosch@...lanox.com,
        jakub.kicinski@...ronome.com, mlxsw@...lanox.com,
        vivien.didelot@...oirfairelinux.com, michael.chan@...adcom.com,
        ganeshgr@...lsio.com, saeedm@...lanox.com,
        simon.horman@...ronome.com, pieter.jansenvanvuuren@...ronome.com,
        john.hurley@...ronome.com, dirk.vandermerwe@...ronome.com,
        alexander.h.duyck@...el.com, ogerlitz@...lanox.com,
        dsahern@...il.com, vijaya.guvva@...ium.com,
        satananda.burla@...ium.com, raghu.vatsavayi@...ium.com,
        felix.manlunas@...ium.com, gospo@...adcom.com,
        sathya.perla@...adcom.com, vasundhara-v.volam@...adcom.com,
        tariqt@...lanox.com, eranbe@...lanox.com,
        jeffrey.t.kirsher@...el.com
Subject: Re: [patch net-next RFC 04/12] dsa: set devlink port attrs for dsa
 ports



On 05/18/2018 06:45 AM, Andrew Lunn wrote:
>> What benefit does it have to register unused ports? What is a usecase
>> for them. Like Florian, I also think they should not be registered.
> 
> Hi Jiri
> 
> They physically exist, so we are accurately describing the hardware by
> registering them.

You are right that the driver is advertising a number of ports that does
not match what is being expected. We unfortunately do not have a good
API for specifying e.g: a sparse port allocation.
-- 
Florian