linux-kernel - Re: [PATCH net-next v3] net: ti: icssg-prueth: Add multicast filtering support

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Message-ID: <b52758c4-a0f4-4cda-9bd0-5ff022a9c9d0@intel.com>
Date: Wed, 5 Jun 2024 12:02:59 +0200
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: MD Danish Anwar <danishanwar@...com>, Dan Carpenter
	<dan.carpenter@...aro.org>, Jan Kiszka <jan.kiszka@...mens.com>, Diogo Ivo
	<diogo.ivo@...mens.com>, Andrew Lunn <andrew@...n.ch>, Simon Horman
	<horms@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Jakub Kicinski
	<kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>, "David S. Miller"
	<davem@...emloft.net>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <srk@...com>, Vignesh Raghavendra
	<vigneshr@...com>, Roger Quadros <rogerq@...nel.org>
Subject: Re: [PATCH net-next v3] net: ti: icssg-prueth: Add multicast
 filtering support



On 05.06.2024 11:52, MD Danish Anwar wrote:
> Add multicast filtering support for ICSSG Driver. Multicast addresses will
> be updated by __dev_mc_sync() API. icssg_prueth_add_macst () and
> icssg_prueth_del_mcast() will be sync and unsync APIs for the driver
> respectively.
> 
> To add a mac_address for a port, driver needs to call icssg_fdb_add_del()
> and pass the mac_address and BIT(port_id) to the API. The ICSSG firmware
> will then configure the rules and allow filtering.
> 
> If a mac_address is added to port0 and the same mac_address needs to be
> added for port1, driver needs to pass BIT(port0) | BIT(port1) to the
> icssg_fdb_add_del() API. If driver just pass BIT(port1) then the entry for
> port0 will be overwritten / lost. This is a design constraint on the
> firmware side.
> 
> To overcome this in the driver, to add any mac_address for let's say portX
> driver first checks if the same mac_address is already added for any other
> port. If yes driver calls icssg_fdb_add_del() with BIT(portX) |
> BIT(other_existing_port). If not, driver calls icssg_fdb_add_del() with
> BIT(portX).
> 
> The same thing is applicable for deleting mac_addresses as well. This
> logic is in icssg_prueth_add_mcast / icssg_prueth_del_mcast APIs.
> 
> Signed-off-by: MD Danish Anwar <danishanwar@...com>
> ---
> Cc: Wojciech Drewek <wojciech.drewek@...el.com>
> 
> v2 -> v3:
> *) Using __dev_mc_sync() instead of __hw_addr_sync_dev().
> *) Stopped keeping local copy of multicast list as pointed out by
>    Wojciech Drewek <wojciech.drewek@...el.com>

Thank you!
Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>

> 
> v1 -> v2:
> *) Rebased on latest net-next/main.
> 
> NOTE: This series can be applied cleanly on the tip of net-next/main. This
> series doesn't depend on any other ICSSG driver related series that is
> floating around in netdev.
> 
> v1 https://lore.kernel.org/all/20240516091752.2969092-1-danishanwar@ti.com/
> v2 https://lore.kernel.org/all/20240604114402.1835973-1-danishanwar@ti.com/
> 
>  drivers/net/ethernet/ti/icssg/icssg_prueth.c | 38 +++++++++++++++++---
>  1 file changed, 34 insertions(+), 4 deletions(-)
> 

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