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

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Message-Id: <20250531101308.155757-5-noltari@gmail.com>
Date: Sat, 31 May 2025 12:13:02 +0200
From: Álvaro Fernández Rojas <noltari@...il.com>
To: jonas.gorski@...il.com,
	florian.fainelli@...adcom.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
Cc: Álvaro Fernández Rojas <noltari@...il.com>
Subject: [RFC PATCH 04/10] net: dsa: b53: fix IP_MULTICAST_CTRL on BCM5325

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);
 }
 
diff --git a/drivers/net/dsa/b53/b53_regs.h b/drivers/net/dsa/b53/b53_regs.h
index 1f15332fb2a7..896684d7f594 100644
--- a/drivers/net/dsa/b53/b53_regs.h
+++ b/drivers/net/dsa/b53/b53_regs.h
@@ -106,6 +106,7 @@
 
 /* IP Multicast control (8 bit) */
 #define B53_IP_MULTICAST_CTRL		0x21
+#define  B53_IP_MCAST_25		BIT(0)
 #define  B53_IPMC_FWD_EN		BIT(1)
 #define  B53_UC_FWD_EN			BIT(6)
 #define  B53_MC_FWD_EN			BIT(7)
-- 
2.39.5