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

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Message-ID: <c9765637-4601-0a7d-7e5e-4c3e9d52d90f@arinc9.com>
Date: Tue, 2 May 2023 23:05:41 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Florian Fainelli <f.fainelli@...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: 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 02/05/2023 21:30, Florian Fainelli wrote:
> 
> 
> 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?

I've put it with v2. Let me send v3 to remove the tested-by and add your 
reviewed-by to the other patch.

Arınç