linux-kernel - Re: [PATCH net 2/2] net: dsa: mt7530: fix network connectivity with multiple CPU ports

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Date:   Tue, 2 May 2023 11:30:36 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     arinc9.unal@...il.com, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Daniel Golle <daniel@...rotopia.org>,
        Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        René van Dorst <opensource@...rst.com>
Cc:     Arınç ÜNAL <arinc.unal@...nc9.com>,
        Richard van Schagen <richard@...terhints.com>,
        Richard van Schagen <vschagen@...com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bartel Eerdekens <bartel.eerdekens@...stell8.be>,
        mithat.guner@...ont.com, erkin.bozoglu@...ont.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH net 2/2] net: dsa: mt7530: fix network connectivity with
 multiple CPU ports



On 5/1/2023 5:15 AM, arinc9.unal@...il.com wrote:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> On mt753x_cpu_port_enable() there's code that enables flooding for the CPU
> port only. Since mt753x_cpu_port_enable() runs twice when both CPU ports
> are enabled, port 6 becomes the only port to forward the frames to. But
> port 5 is the active port, so no frames received from the user ports will
> be forwarded to port 5 which breaks network connectivity.
> 
> Every bit of the BC_FFP, UNM_FFP, and UNU_FFP bits represents a port. Fix
> this issue by setting the bit that corresponds to the CPU port without
> overwriting the other bits.
> 
> Clear the bits beforehand only for the MT7531 switch. According to the
> documents MT7621 Giga Switch Programming Guide v0.3 and MT7531 Reference
> Manual for Development Board v1.0, after reset, the BC_FFP, UNM_FFP, and
> UNU_FFP bits are set to 1 for MT7531, 0 for MT7530.
> 
> Tested-by: Arınç ÜNAL <arinc.unal@...nc9.com>

This tag is implied by your Signed-off-by tag. No Fixes tag for this one?
-- 
Florian