netdev - Re: [PATCH net-next 0/2] Broadcom tags support for 531x5/539x families

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Date:   Wed, 08 Jan 2020 16:01:32 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     f.fainelli@...il.com
Cc:     netdev@...r.kernel.org, andrew@...n.ch, vivien.didelot@...il.com,
        jakub.kicinski@...ronome.com
Subject: Re: [PATCH net-next 0/2] Broadcom tags support for 531x5/539x
 families

From: Florian Fainelli <f.fainelli@...il.com>
Date: Tue,  7 Jan 2020 21:06:04 -0800

> This patch series finally allows us to enable Broadcom tags on the
> BCM531x5/BCM539x switch series which are very often cascaded onto
> another on-chip Broadcom switch. Because of that we need to be able to
> detect that Broadcom tags are already enabled on our DSA master which
> happens to be a DSA slave in that case since they are not part of the
> same DSA switch tree, the protocol does not support that.
> 
> Due to the way DSA works, get_tag_protocol() is called prior to
> ds->ops->setup and we do not have all data structures set-up (in
> particular dsa_port::cpu_dp is not filed yet) so doing this at the time
> get_tag_protocol() is called and without exporting a helper function is
> desirable to limit our footprint into the framework.
> 
> Having the core (net/dsa/dsa2.c) return and enforce DSA_TAG_PROTO_NONE
> was considered and done initially but this leaves the driver outside of
> the decision to force/fallback to a particular protocol, instead of
> letting it in control. Also there is no reason to suspect that all
> tagging protocols are problematic, e.g.: "inner" Marvell EDSA with
> "outer" Broadcom tag may work just fine, and vice versa.
> 
> This was tested on:
> 
> - Lamobo R1 which now has working Broadcom tags for its external BCM53125 switch
> - BCM7445 which has a BCM53125 hanging off one of its internal switch
>   port, the BCM53125 still works with DSA_TAG_PROTO_NONE
> - BCM7278 which has a peculiar dual CPU port set-up (so dual IMP mode
>   needs to be enabled)
> - Northstar Plus with DSA_TAG_PROTO_BRCM_PREPEND and no external
>   switches hanging off the internal switch

Series applied, thanks Florian.