netdev - Re: [PATCH net-next 0/4] net: dsa: b53: Clean up CPU/IMP ports

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Date:   Fri, 17 Sep 2021 00:19:02 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH net-next 0/4] net: dsa: b53: Clean up CPU/IMP ports

On 16.09.2021 23:46, Florian Fainelli wrote:
> On 9/16/21 9:23 AM, Florian Fainelli wrote:
>> On 9/16/21 5:03 AM, Rafał Miłecki wrote:
>>> From: Rafał Miłecki <rafal@...ecki.pl>
>>>
>>> This has been tested on:
>>>
>>> 1. Luxul XBR-4500 with used CPU port 5
>>> [    8.361438] b53-srab-switch 18007000.ethernet-switch: found switch: BCM53012, rev 0
>>>
>>> 2. Netgear R8000 with used CPU port 8
>>> [    4.453858] b53-srab-switch 18007000.ethernet-switch: found switch: BCM53012, rev 5
>>
>> These look good at first glance, let me give them a try on 7445 and 7278
>> at least before responding with Reviewed-by/Tested-by tags, thanks!
>>
> Found some issues on 7445 and 7278 while moving to the latest net-next
> which I will be addressing but this worked nicely.
> 
> What do you think about removing dev->enabled_ports and
> b53_for_each_port entirely and using a DSA helper that iterates over the
> switch's port list? Now that we have dev->num_ports accurately reflect
> the number of ports it should be equivalent.

The limitation I see in DSA is skipping unavailable ports. E.g. BCM5301x
switches that don't have port 6. The closest match for such case I found
is DSA_PORT_TYPE_UNUSED but I'm not sure if it's enough to handle those
cases.

That DSA_PORT_TYPE_UNUSED would probably require investigating DSA & b53
behaviour *and* discussing it with DSA maintainer to make sure we don't
abuse that.