netdev - Re: [RFC PATCH 04/10] net: dsa: b53: fix IP_MULTICAST

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Message-ID: <5d3d04c0-d9e4-4f80-8ab3-7bedb81505b3@broadcom.com>
Date: Mon, 2 Jun 2025 11:06:07 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Álvaro Fernández Rojas <noltari@...il.com>,
 jonas.gorski@...il.com, andrew@...n.ch, olteanv@...il.com,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, vivien.didelot@...il.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, dgcbueu@...il.com
Subject: Re: [RFC PATCH 04/10] net: dsa: b53: fix IP_MULTICAST_CTRL on BCM5325

On 5/31/25 03:13, Álvaro Fernández Rojas wrote:
> BCM5325 doesn't implement B53_UC_FWD_EN, B53_MC_FWD_EN or B53_IPMC_FWD_EN.
> 
> Fixes: 53568438e381 ("net: dsa: b53: Add support for port_egress_floods callback")
> Signed-off-by: Álvaro Fernández Rojas <noltari@...il.com>
> ---
>   drivers/net/dsa/b53/b53_common.c | 13 +++++++++----
>   drivers/net/dsa/b53/b53_regs.h   |  1 +
>   2 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
> index f314aeb81643..6b2ad82aa95f 100644
> --- a/drivers/net/dsa/b53/b53_common.c
> +++ b/drivers/net/dsa/b53/b53_common.c
> @@ -367,11 +367,16 @@ static void b53_set_forwarding(struct b53_device *dev, int enable)
>   		b53_write8(dev, B53_CTRL_PAGE, B53_SWITCH_CTRL, mgmt);
>   	}
>   
> -	/* Look at B53_UC_FWD_EN and B53_MC_FWD_EN to decide whether
> -	 * frames should be flooded or not.
> -	 */
>   	b53_read8(dev, B53_CTRL_PAGE, B53_IP_MULTICAST_CTRL, &mgmt);
> -	mgmt |= B53_UC_FWD_EN | B53_MC_FWD_EN | B53_IPMC_FWD_EN;
> +	if (is5325(dev)) {
> +		/* Enable IP multicast address scheme. */
> +		mgmt |= B53_IP_MCAST_25;
> +	} else {
> +		/* Look at B53_UC_FWD_EN and B53_MC_FWD_EN to decide whether
> +		 * frames should be flooded or not.
> +		 */
> +		mgmt |= B53_UC_FWD_EN | B53_MC_FWD_EN | B53_IPMC_FWD_EN;
> +	}
>   	b53_write8(dev, B53_CTRL_PAGE, B53_IP_MULTICAST_CTRL, mgmt);

I don't think B53_IPM_MULTICAST_CTRL is a valid register offset within 
B53_CTRL_PAGE, or elsewhere for that matter, do you have a datasheet 
that says this exists?
-- 
Florian