netdev - [PATCH net-next 2/4 v4] net: dsa: rtl8366rb: Support flood control

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Date:   Wed, 29 Sep 2021 23:03:47 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>,
        Alvin Šipraga <alsi@...g-olufsen.dk>,
        Mauri Sandberg <sandberg@...lfence.com>,
        DENG Qingfang <dqfext@...il.com>
Subject: [PATCH net-next 2/4 v4] net: dsa: rtl8366rb: Support flood control

Now that we have implemented bridge flag handling we can easily
support flood control as well so let's do it.

Cc: Vladimir Oltean <olteanv@...il.com>
Cc: Alvin Šipraga <alsi@...g-olufsen.dk>
Cc: Mauri Sandberg <sandberg@...lfence.com>
Cc: Florian Fainelli <f.fainelli@...il.com>
Cc: DENG Qingfang <dqfext@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
ChangeLog v3->v4:
- No changes, rebased on the other patches.
ChangeLog v2->v3:
- Move the UNMC under the multicast setting as it is related to
  multicast to unknown address.
- Add some more registers from the API, unfortunately we don't
  know how to make use of them.
- Use tabs for indentation in copypaste bug.
- Since we don't know how to make the elaborate storm control
  work just mention flood control in the message.
ChangeLog v1->v2:
- New patch
---
 drivers/net/dsa/rtl8366rb.c | 55 +++++++++++++++++++++++++++++++++++--
 1 file changed, 53 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/rtl8366rb.c b/drivers/net/dsa/rtl8366rb.c
index b3056064b937..52e750ea790e 100644
--- a/drivers/net/dsa/rtl8366rb.c
+++ b/drivers/net/dsa/rtl8366rb.c
@@ -164,6 +164,26 @@
  */
 #define RTL8366RB_VLAN_INGRESS_CTRL2_REG	0x037f
 
+/* Storm registers are for flood control
+ *
+ * 02e2 and 02e3 are defined in the header for the RTL8366RB API
+ * but there are no usage examples. The implementation only activates
+ * the filter per port in the CTRL registers.
+ */
+#define RTL8366RB_STORM_FILTERING_1_REG		0x02e2
+#define RTL8366RB_STORM_FILTERING_PERIOD_BIT	BIT(0)
+#define RTL8366RB_STORM_FILTERING_PERIOD_MSK	GENMASK(1, 0)
+#define RTL8366RB_STORM_FILTERING_COUNT_BIT	BIT(1)
+#define RTL8366RB_STORM_FILTERING_COUNT_MSK	GENMASK(3, 2)
+#define RTL8366RB_STORM_FILTERING_BC_BIT	BIT(5)
+#define RTL8366RB_STORM_FILTERING_2_REG		0x02e3
+#define RTL8366RB_STORM_FILTERING_MC_BIT	BIT(0)
+#define RTL8366RB_STORM_FILTERING_UNDA_BIT	BIT(5)
+#define RTL8366RB_STORM_BC_CTRL			0x03e0
+#define RTL8366RB_STORM_MC_CTRL			0x03e1
+#define RTL8366RB_STORM_UNDA_CTRL		0x03e2
+#define RTL8366RB_STORM_UNMC_CTRL		0x03e3
+
 /* LED control registers */
 #define RTL8366RB_LED_BLINKRATE_REG		0x0430
 #define RTL8366RB_LED_BLINKRATE_MASK		0x0007
@@ -1282,8 +1302,8 @@ rtl8366rb_port_pre_bridge_flags(struct dsa_switch *ds, int port,
 				struct switchdev_brport_flags flags,
 				struct netlink_ext_ack *extack)
 {
-	/* We support enabling/disabling learning */
-	if (flags.mask & ~(BR_LEARNING))
+	if (flags.mask & ~(BR_LEARNING | BR_BCAST_FLOOD |
+			   BR_MCAST_FLOOD | BR_FLOOD))
 		return -EINVAL;
 
 	return 0;
@@ -1305,6 +1325,37 @@ rtl8366rb_port_bridge_flags(struct dsa_switch *ds, int port,
 			return ret;
 	}
 
+	if (flags.mask & BR_BCAST_FLOOD) {
+		ret = regmap_update_bits(smi->map, RTL8366RB_STORM_BC_CTRL,
+					 BIT(port),
+					 (flags.val & BR_BCAST_FLOOD) ? BIT(port) : 0);
+		if (ret)
+			return ret;
+	}
+
+	if (flags.mask & BR_MCAST_FLOOD) {
+		ret = regmap_update_bits(smi->map, RTL8366RB_STORM_MC_CTRL,
+					 BIT(port),
+					 (flags.val & BR_MCAST_FLOOD) ? BIT(port) : 0);
+		if (ret)
+			return ret;
+		/* UNMC = Unknown multicast address */
+		ret = regmap_update_bits(smi->map, RTL8366RB_STORM_UNMC_CTRL,
+					 BIT(port),
+					 (flags.val & BR_FLOOD) ? BIT(port) : 0);
+		if (ret)
+			return ret;
+	}
+
+	if (flags.mask & BR_FLOOD) {
+		/* UNDA = Unknown destination address */
+		ret = regmap_update_bits(smi->map, RTL8366RB_STORM_UNDA_CTRL,
+					 BIT(port),
+					 (flags.val & BR_FLOOD) ? BIT(port) : 0);
+		if (ret)
+			return ret;
+	}
+
 	return 0;
 }
 
-- 
2.31.1