linux-kernel - Re: [PATCH net-next] net: dsa: qca8k: Initialize the switch with correct number of ports

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Message-ID: <a6e8b1cb-4c32-34ba-2a10-d736a953c108@gmail.com>
Date:   Thu, 24 Oct 2019 09:33:19 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Michal Vokáč <michal.vokac@...ft.com>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: dsa: qca8k: Initialize the switch with
 correct number of ports

On 10/24/19 7:12 AM, Andrew Lunn wrote:
> On Thu, Oct 24, 2019 at 03:46:58PM +0200, Michal Vokáč wrote:
>> Since commit 0394a63acfe2 ("net: dsa: enable and disable all ports")
>> the dsa core disables all unused ports of a switch. In this case
>> disabling ports with numbers higher than QCA8K_NUM_PORTS causes that
>> some switch registers are overwritten with incorrect content.
> 
> Humm.
> 
> The same problem might exist in other drivers:
> 
> linux/drivers/net/dsa$ grep -r "ds->num_ports = DSA_MAX_PORTS"
> qca8k.c:	priv->ds->num_ports = DSA_MAX_PORTS;
> b53/b53_common.c:	ds->num_ports = DSA_MAX_PORTS;

Not for b53 because this later gets clamped with dev->num_ports in
b53_setup().

> mt7530.c:	priv->ds->num_ports = DSA_MAX_PORTS;
> microchip/ksz_common.c:	ds->num_ports = DSA_MAX_PORTS;
> dsa_loop.c:	ds->num_ports = DSA_MAX_PORTS;
> 
> dsa_loop.c looks O.K, it does support DSA_MAX_PORTS ports.
> 
> But the others?
> 
>     Andrew
> 


-- 
Florian