netdev - Help: Using DSA capabilities with Microchip KSZ8 Ethernet switch and i.MX8plus does not work

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Message-ID: <20211213082630.Horde.ZNGY1CvfyMcmXElbyNHgwGJ@webmail.b-tu.de>
Date:   Mon, 13 Dec 2021 08:26:30 +0100
From:   André Werner <Andre.Werner@...u.de>
To:     netdev@...r.kernel.org
Cc:     andre.werner@...tec-electronic.com
Subject: Help: Using DSA capabilities with Microchip KSZ8 Ethernet switch
 and i.MX8plus does not work

Dear community,

trying to connect a custom board with i.MX8plus SOM to a Microchip  
KSZ8795 Ethernet switch still fails. Searching on the Internet did not  
provide a solution anywhere. I was trying different suggestions and  
follow the steps provided in the DSA documentation. The switch is  
working at the SOM if it is not configured with the ksz8795 driver and  
DSA capabilities. Thus, electrical connections on the custom board  
seem working.

The switch uses tail tagging in the driver, so maybe the connection of  
the i.MX8 FEC driver and its internet acceleration features drop  
frames with length and CRC errors. I tried to disable all that  
RACC-features in the driver and I proved the configuration using  
devmem. It looks reasonable but I still did not see any receiving  
frames or see frames send to the host. Moreover, using VLAN from the  
manual of the DSA documentation still shows tail tagging switched on  
if reading the switch's configuration registers. I was wondering about  
that since I thought that this is not necessary when using VLAN  
capabilities.

Did anyone use an Ethernet switch e.g. Microchip KSZ8 family, with  
similar problems, and get it working?

Thx in advance.

André Werner
SYS TEC electronic AG

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