netdev - Re: [PATCH net] net: systemport: Correclty disambiguate driver instances

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Message-ID: <87604edn1q.fsf@weeman.i-did-not-set--mail-host-address--so-tickle-me>
Date:   Thu, 26 Apr 2018 11:06:57 -0400
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net] net: systemport: Correclty disambiguate driver instances

Florian Fainelli <f.fainelli@...il.com> writes:

> While adding the DSA notifier, we will be sending DSA notifications with
> info->master that is going to point to a particular net_device instance.
>
> Our logic in bcm_sysport_map_queues() correctly disambiguates net_device
> instances that are not covered by our own driver, but it will not make
> sure that info->master points to a particular driver instance that we
> are interested in. In a system where e.g: two or more SYSTEMPORT
> instances are registered, this would lead in programming two or more
> times the queue mapping, completely messing with the logic which does
> the queue/port allocation and tracking.
>
> Fix this by looking at the notifier_block pointer which is unique per
> instance and allows us to go back to our driver private structure, and
> in turn to the backing net_device instance.
>
> Fixes: d156576362c0 ("net: systemport: Establish lower/upper queue mapping")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Reviewed-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>