netdev - Re: MT7530 bug, forward broadcast and unknown frames to the correct CPU port

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Date: Wed, 17 May 2023 18:52:09 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: Arınç ÜNAL <arinc.unal@...nc9.com>
Cc: Daniel Golle <daniel@...rotopia.org>, DENG Qingfang <dqfext@...il.com>,
	Greg Ungerer <gerg@...nel.org>,
	Richard van Schagen <richard@...terhints.com>,
	Richard van Schagen <vschagen@...com>,
	Frank Wunderlich <frank-w@...lic-files.de>, mithat.guner@...ont.com,
	erkin.bozoglu@...ont.com, bartel.eerdekens@...stell8.be,
	netdev <netdev@...r.kernel.org>
Subject: Re: MT7530 bug, forward broadcast and unknown frames to the correct
 CPU port

On Tue, May 16, 2023 at 11:01:02PM +0300, Arınç ÜNAL wrote:
> Without preferring port 6:
> 
> [ ID][Role] Interval           Transfer     Bitrate         Retr
> [  5][TX-C]   0.00-20.00  sec   374 MBytes   157 Mbits/sec  734    sender
> [  5][TX-C]   0.00-20.00  sec   373 MBytes   156 Mbits/sec    receiver
> [  7][RX-C]   0.00-20.00  sec  1.81 GBytes   778 Mbits/sec    0    sender
> [  7][RX-C]   0.00-20.00  sec  1.81 GBytes   777 Mbits/sec    receiver
> 
> With preferring port 6:
> 
> [ ID][Role] Interval           Transfer     Bitrate         Retr
> [  5][TX-C]   0.00-20.00  sec  1.99 GBytes   856 Mbits/sec  273    sender
> [  5][TX-C]   0.00-20.00  sec  1.99 GBytes   855 Mbits/sec    receiver
> [  7][RX-C]   0.00-20.00  sec  1.72 GBytes   737 Mbits/sec   15    sender
> [  7][RX-C]   0.00-20.00  sec  1.71 GBytes   736 Mbits/sec    receiver
> 
> This scenario is quite popular as you would see a lot of people using one
> port for WAN and the other ports for LAN.
> 
> Therefore, the "prefer local CPU port" operation would be useful. If you can
> introduce the operation to the DSA subsystem, I will make a patch to start
> using it on the MT7530 DSA subdriver.

Patches adding infrastructure will not be accepted without one user of
that infra, so if you could pick up my patch from the ML, keep my author
and signed-off-by tag, add yours afterwards, give it a compelling commit
message backed up by data such as this, and submit it along your mt7530
user, that would probably be good.