linux-kernel - Re: [ethernet/broadcom/bgmac]: Implement software multicast filter clear

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Message-ID: <94abe22f-ae52-4bc6-aef1-4378db38f494@broadcom.com>
Date: Thu, 17 Apr 2025 10:56:45 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Ujwal Kundur <ujwal.kundur@...il.com>, rafal@...ecki.pl,
 bcm-kernel-feedback-list@...adcom.com
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, shuah@...nel.org
Subject: Re: [ethernet/broadcom/bgmac]: Implement software multicast filter
 clear

Howdy,

On 4/13/25 00:25, Ujwal Kundur wrote:
> Hi,
>     I'm trying to work on a few TODOs in the
> drivers/net/ethernet/broadcom/bgmac.c driver code and came across the
> "Clear software multicast filter list" item.
>     I tried comparing the multicast filter implementation of the
> sb1250-mac.c driver for inspiration but realized that most of the code
> for bgmac has been written by reverse-engineering the specs:
>     hhttps://bcm-v4.sipsolutions.net/Specification/
> 
>     I'd like to try my hand at this if there are documents/guides
> around this topic or if there's a canonical source for the binary that
> I can try reverse engineering. Please let me know if you have any
> leads/advice.

Given that these controllers are always interfaced with either an 
integrated or an external Ethernet switch chip, the design was done 
assuming that the switch will be operated in managed mode and multicast 
filtering will be done on the switch side.

It's been a while since I looked at that part of the DSA and bridge 
stack, but we should be pretty close to having that capability nowadays.
-- 
Florian