linux-kernel - Re: [PATCH net-next 4/9] net: dsa: mv88e6xxx: allocate the number of ports

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Message-ID: <87tw6aq2oq.fsf@weeman.i-did-not-set--mail-host-address--so-tickle-me>
Date:   Thu, 30 Mar 2017 10:06:29 -0400
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next 4/9] net: dsa: mv88e6xxx: allocate the number of ports

Hi Andrew,

Andrew Lunn <andrew@...n.ch> writes:

> On Wed, Mar 29, 2017 at 04:30:15PM -0400, Vivien Didelot wrote:
>> The current code allocates DSA_MAX_PORTS ports for a Marvell dsa_switch
>> structure. Provide the exact number of ports so the corresponding
>> ds->num_ports is accurate.
>
> Is net/dsa/dsa.c: dsa_switch_setup() still used?  If it is, won't that
> invalidate your assumption about ds->num_ports.

I think dsa_switch_setup is part of the legacy code and is likely to be
removed soon.

But this is not an issue per-se. What happens if the switch is allocated
with DSA_MAX_PORTS ports instead of the correct number, is that the PVT
will be programmed to allow the non-existent port IDs to egress frames
on the CPU port and DSA links only.

Thanks,

        Vivien