netdev - Re: [PATCH v2 iproute2-next] ip link: add sub-command to view and change DSA master

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Date:   Thu, 22 Sep 2022 08:36:12 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <vladimir.oltean@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        David Ahern <dsahern@...nel.org>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: [PATCH v2 iproute2-next] ip link: add sub-command to view and
 change DSA master



On 9/22/2022 8:27 AM, Stephen Hemminger wrote:
> On Thu, 22 Sep 2022 06:24:05 -0700
> Jakub Kicinski <kuba@...nel.org> wrote:
> 
>> On Thu, 22 Sep 2022 03:30:43 +0200 Andrew Lunn wrote:
>>> Looking at these, none really fit the concept of what the master
>>> interface is.
>>>
>>> slave is also used quite a lot within DSA, but we can probably use
>>> user in place of that, it is already somewhat used as a synonym within
>>> DSA terminology.
>>>
>>> Do you have any more recommendations for something which pairs with
>>> user.
>>
>> cpu-ifc? via?
> 
> I did look at the Switch Abstraction Layer document which
> started at Microsoft for Sonic and is now part of Open Compute.
> 
> Didn't see anything there. The 802 spec uses words like
> aggregator port etc.

Top of the rack switches typically have a built-in DMA controller for 
each user-facing port such that there is not really a management/conduit 
CPU like what DSA supports, that is the whole reason actually why we 
keep having a separation between "pure switchdev" and DSA drivers. If 
you had not attended the talk from Andrew, Vivien and myself back in 
2017 in Montreal, I suggest you watch it now in case it provides some 
inspiration for suggestion appropriate terms:

https://www.youtube.com/watch?v=EK5ZmQOYSpM
-- 
Florian