netdev - Re: ping test with DSA ports failing

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Message-ID: <05b24725-f266-4360-b8af-fd299fbff5be@lunn.ch>
Date: Thu, 25 Apr 2024 20:22:34 +0200
From: Andrew Lunn <andrew@...n.ch>
To: SIMON BABY <simonkbaby@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: ping test with DSA ports failing

On Thu, Apr 25, 2024 at 10:37:38AM -0700, SIMON BABY wrote:
> Hello team,
> 
> 
> My test setup with DSA ports is below. Please confirm if it is a valid test
> case for ping. 
> 
> Ping is failing most of the time but succeeds sometimes. Attached is the
> Wireshark capture from my laptop and the tcpdump from sama7 processor. 
> 
>  
> 
> __________                                                     
> _______________   192.168.0.119/24                  192.168.0.155/24  _________
> 
> |                    |                                                    |
>                                 |____________lan1__________________ ____|
>                    |
> 
> |  SAMA7     |  eth0 (RGMII)                           |  marvel 88e6390 |
> ___________  lan2                                                  |
> laptop      |
> 
> |        gmac0|---------------------------------------|port0 (RGMII)       |
> ___________  lan3                                                  |________ |
> 
> |_________|                                                    |
>                                 |___________  lan4      
> 
>                                                                             |
>                                 |___________  lan5
> 
>                                                                             |
>                                 |___________  lan6
> 
>                                                                             |
> ______________ |
> 

You ASCII art is all messed up and unreadable.

> Ping is failing most of the times. Interestingly it is passing sometime. Below
> are the logs.

As i've said before, RGMII delays are often the cause of the problem.

   Andrew