Merge branch 'rtl8365mb-vc-support'

Alvin Šipraga says:

====================
net: dsa: add support for RTL8365MB-VC

This series adds support for Realtek's RTL8365MB-VC, a 4+1 port
10/100/1000M Ethernet switch. The driver - rtl8365mb - was developed by
Michael Ramussen and myself.

This version of the driver is relatively slim, implementing only the
standalone port functionality and no offload capabilities. It is based
on a previous RFC series [1] from August, and the main difference is the
removal of some spurious VLAN operations. Otherwise I have simply
addressed most of the feedback. Please see the respective patches for
more detail.

In parallel I am working on offloading the bridge layer capabilities,
but I would like to get the basic stuff upstreamed as soon as possible.

v3 -> v4:
- get irq before setting virq parents (fixes kernel test robot
warning)
- remove pad-to-72-bytes logic in tagger xmit (fixes DENG Qingfang's
suggestion); no longer needed as we set CPU minimum RX size to 64
bytes
- use mutex to protect MIB counter access instead of a spinlock (fixes
Jakub's feedback on v3 statistics refactoring)

v2 -> v3:
- move IRQ setup earlier in probe per Florian's suggestion
- fix compilation error on some archs due to FIELD_PREP use in v1
- follow Jakub's suggestion and use the standard ethtool stats API;
NOTE: new patch in the series for relevant DSA plumbing
- following the stats change, it became apparent that the rtl8366
helper library is no longer that helpful; scrap it and implement
the ethtool ops specifically for this chip

v1 -> v2:
- drop DSA port type checks during MAC configuration
- use OF properties to configure RGMII TX/RX delay
- don't set default fwd_offload_mark if packet is trapped to CPU
- remove port mapping macros
- update device tree bindings documentation with an example
- cosmetic changes to the tagging driver using FIELD_* macros

[1] https://lore.kernel.org/netdev/[e-mail]/
====================

Signed-off-by: David S. Miller <[e-mail]>

Documentation/devicetree/bindings/net/dsa/realtek-smi.txt

···
 Required properties:
 
 - compatible: must be exactly one of:
+      "realtek,rtl8365mb" (4+1 ports)
       "realtek,rtl8366"
       "realtek,rtl8366rb" (4+1 ports)
       "realtek,rtl8366s"  (4+1 ports)
···
 and subnodes of DSA switches.
 
 Examples:
+
+An example for the RTL8366RB:
 
 switch {
 	compatible = "realtek,rtl8366rb";
···
 			reg = <4>;
 			interrupt-parent = <&switch_intc>;
 			interrupts = <12>;
+		};
+	};
+};
+
+An example for the RTL8365MB-VC:
+
+switch {
+	compatible = "realtek,rtl8365mb";
+	mdc-gpios = <&gpio1 16 GPIO_ACTIVE_HIGH>;
+	mdio-gpios = <&gpio1 17 GPIO_ACTIVE_HIGH>;
+	reset-gpios = <&gpio5 0 GPIO_ACTIVE_LOW>;
+
+	switch_intc: interrupt-controller {
+		interrupt-parent = <&gpio5>;
+		interrupts = <1 IRQ_TYPE_LEVEL_LOW>;
+		interrupt-controller;
+		#address-cells = <0>;
+		#interrupt-cells = <1>;
+	};
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0>;
+		port@0 {
+			reg = <0>;
+			label = "swp0";
+			phy-handle = <&ethphy0>;
+		};
+		port@1 {
+			reg = <1>;
+			label = "swp1";
+			phy-handle = <&ethphy1>;
+		};
+		port@2 {
+			reg = <2>;
+			label = "swp2";
+			phy-handle = <&ethphy2>;
+		};
+		port@3 {
+			reg = <3>;
+			label = "swp3";
+			phy-handle = <&ethphy3>;
+		};
+		port@6 {
+			reg = <6>;
+			label = "cpu";
+			ethernet = <&fec1>;
+			phy-mode = "rgmii";
+			tx-internal-delay-ps = <2000>;
+			rx-internal-delay-ps = <2000>;
+
+			fixed-link {
+				speed = <1000>;
+				full-duplex;
+				pause;
+			};
+		};
+	};
+
+	mdio {
+		compatible = "realtek,smi-mdio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		ethphy0: phy@0 {
+			reg = <0>;
+			interrupt-parent = <&switch_intc>;
+			interrupts = <0>;
+		};
+		ethphy1: phy@1 {
+			reg = <1>;
+			interrupt-parent = <&switch_intc>;
+			interrupts = <1>;
+		};
+		ethphy2: phy@2 {
+			reg = <2>;
+			interrupt-parent = <&switch_intc>;
+			interrupts = <2>;
+		};
+		ethphy3: phy@3 {
+			reg = <3>;
+			interrupt-parent = <&switch_intc>;
+			interrupts = <3>;
 		};
 	};
 };

drivers/net/dsa/Kconfig

···
 config NET_DSA_REALTEK_SMI
 	tristate "Realtek SMI Ethernet switch family support"
 	select NET_DSA_TAG_RTL4_A
+	select NET_DSA_TAG_RTL8_4
 	select FIXED_PHY
 	select IRQ_DOMAIN
 	select REALTEK_PHY

drivers/net/dsa/Makefile

···
 obj-$(CONFIG_NET_DSA_MV88E6060) += mv88e6060.o
 obj-$(CONFIG_NET_DSA_QCA8K)	+= qca8k.o
 obj-$(CONFIG_NET_DSA_REALTEK_SMI) += realtek-smi.o
-realtek-smi-objs		:= realtek-smi-core.o rtl8366.o rtl8366rb.o
+realtek-smi-objs		:= realtek-smi-core.o rtl8366.o rtl8366rb.o rtl8365mb.o
 obj-$(CONFIG_NET_DSA_SMSC_LAN9303) += lan9303-core.o
 obj-$(CONFIG_NET_DSA_SMSC_LAN9303_I2C) += lan9303_i2c.o
 obj-$(CONFIG_NET_DSA_SMSC_LAN9303_MDIO) += lan9303_mdio.o

drivers/net/dsa/realtek-smi-core.c

···
 		.compatible = "realtek,rtl8366s",
 		.data = NULL,
 	},
+	{
+		.compatible = "realtek,rtl8365mb",
+		.data = &rtl8365mb_variant,
+	},
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, realtek_smi_of_match);

drivers/net/dsa/realtek-smi-core.h

···
 void rtl8366_get_ethtool_stats(struct dsa_switch *ds, int port, uint64_t *data);
 
 extern const struct realtek_smi_variant rtl8366rb_variant;
+extern const struct realtek_smi_variant rtl8365mb_variant;
 
 #endif /*  _REALTEK_SMI_H */

drivers/net/dsa/rtl8365mb.c

···
+// SPDX-License-Identifier: GPL-2.0
+/* Realtek SMI subdriver for the Realtek RTL8365MB-VC ethernet switch.
+ *
+ * Copyright (C) 2021 Alvin Šipraga <[e-mail]>
+ * Copyright (C) 2021 Michael Rasmussen <[e-mail]>
+ *
+ * The RTL8365MB-VC is a 4+1 port 10/100/1000M switch controller. It includes 4
+ * integrated PHYs for the user facing ports, and an extension interface which
+ * can be connected to the CPU - or another PHY - via either MII, RMII, or
+ * RGMII. The switch is configured via the Realtek Simple Management Interface
+ * (SMI), which uses the MDIO/MDC lines.
+ *
+ * Below is a simplified block diagram of the chip and its relevant interfaces.
+ *
+ *                          .-----------------------------------.
+ *                          |                                   |
+ *         UTP <---------------> Giga PHY <-> PCS <-> P0 GMAC   |
+ *         UTP <---------------> Giga PHY <-> PCS <-> P1 GMAC   |
+ *         UTP <---------------> Giga PHY <-> PCS <-> P2 GMAC   |
+ *         UTP <---------------> Giga PHY <-> PCS <-> P3 GMAC   |
+ *                          |                                   |
+ *     CPU/PHY <-MII/RMII/RGMII--->  Extension  <---> Extension |
+ *                          |       interface 1        GMAC 1   |
+ *                          |                                   |
+ *     SMI driver/ <-MDC/SCL---> Management    ~~~~~~~~~~~~~~   |
+ *        EEPROM   <-MDIO/SDA--> interface     ~REALTEK ~~~~~   |
+ *                          |                  ~RTL8365MB ~~~   |
+ *                          |                  ~GXXXC TAIWAN~   |
+ *        GPIO <--------------> Reset          ~~~~~~~~~~~~~~   |
+ *                          |                                   |
+ *      Interrupt  <----------> Link UP/DOWN events             |
+ *      controller          |                                   |
+ *                          '-----------------------------------'
+ *
+ * The driver uses DSA to integrate the 4 user and 1 extension ports into the
+ * kernel. Netdevices are created for the user ports, as are PHY devices for
+ * their integrated PHYs. The device tree firmware should also specify the link
+ * partner of the extension port - either via a fixed-link or other phy-handle.
+ * See the device tree bindings for more detailed information. Note that the
+ * driver has only been tested with a fixed-link, but in principle it should not
+ * matter.
+ *
+ * NOTE: Currently, only the RGMII interface is implemented in this driver.
+ *
+ * The interrupt line is asserted on link UP/DOWN events. The driver creates a
+ * custom irqchip to handle this interrupt and demultiplex the events by reading
+ * the status registers via SMI. Interrupts are then propagated to the relevant
+ * PHY device.
+ *
+ * The EEPROM contains initial register values which the chip will read over I2C
+ * upon hardware reset. It is also possible to omit the EEPROM. In both cases,
+ * the driver will manually reprogram some registers using jam tables to reach
+ * an initial state defined by the vendor driver.
+ *
+ * This Linux driver is written based on an OS-agnostic vendor driver from
+ * Realtek. The reference GPL-licensed sources can be found in the OpenWrt
+ * source tree under the name rtl8367c. The vendor driver claims to support a
+ * number of similar switch controllers from Realtek, but the only hardware we
+ * have is the RTL8365MB-VC. Moreover, there does not seem to be any chip under
+ * the name RTL8367C. Although one wishes that the 'C' stood for some kind of
+ * common hardware revision, there exist examples of chips with the suffix -VC
+ * which are explicitly not supported by the rtl8367c driver and which instead
+ * require the rtl8367d vendor driver. With all this uncertainty, the driver has
+ * been modestly named rtl8365mb. Future implementors may wish to rename things
+ * accordingly.
+ *
+ * In the same family of chips, some carry up to 8 user ports and up to 2
+ * extension ports. Where possible this driver tries to make things generic, but
+ * more work must be done to support these configurations. According to
+ * documentation from Realtek, the family should include the following chips:
+ *
+ *  - RTL8363NB
+ *  - RTL8363NB-VB
+ *  - RTL8363SC
+ *  - RTL8363SC-VB
+ *  - RTL8364NB
+ *  - RTL8364NB-VB
+ *  - RTL8365MB-VC
+ *  - RTL8366SC
+ *  - RTL8367RB-VB
+ *  - RTL8367SB
+ *  - RTL8367S
+ *  - RTL8370MB
+ *  - RTL8310SR
+ *
+ * Some of the register logic for these additional chips has been skipped over
+ * while implementing this driver. It is therefore not possible to assume that
+ * things will work out-of-the-box for other chips, and a careful review of the
+ * vendor driver may be needed to expand support. The RTL8365MB-VC seems to be
+ * one of the simpler chips.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/mutex.h>
+#include <linux/of_irq.h>
+#include <linux/regmap.h>
+#include <linux/if_bridge.h>
+
+#include "realtek-smi-core.h"
+
+/* Chip-specific data and limits */
+#define RTL8365MB_CHIP_ID_8365MB_VC		0x6367
+#define RTL8365MB_CPU_PORT_NUM_8365MB_VC	6
+#define RTL8365MB_LEARN_LIMIT_MAX_8365MB_VC	2112
+
+/* Family-specific data and limits */
+#define RTL8365MB_NUM_PHYREGS	32
+#define RTL8365MB_PHYREGMAX	(RTL8365MB_NUM_PHYREGS - 1)
+#define RTL8365MB_MAX_NUM_PORTS	(RTL8365MB_CPU_PORT_NUM_8365MB_VC + 1)
+
+/* Chip identification registers */
+#define RTL8365MB_CHIP_ID_REG		0x1300
+
+#define RTL8365MB_CHIP_VER_REG		0x1301
+
+#define RTL8365MB_MAGIC_REG		0x13C2
+#define   RTL8365MB_MAGIC_VALUE		0x0249
+
+/* Chip reset register */
+#define RTL8365MB_CHIP_RESET_REG	0x1322
+#define RTL8365MB_CHIP_RESET_SW_MASK	0x0002
+#define RTL8365MB_CHIP_RESET_HW_MASK	0x0001
+
+/* Interrupt polarity register */
+#define RTL8365MB_INTR_POLARITY_REG	0x1100
+#define   RTL8365MB_INTR_POLARITY_MASK	0x0001
+#define   RTL8365MB_INTR_POLARITY_HIGH	0
+#define   RTL8365MB_INTR_POLARITY_LOW	1
+
+/* Interrupt control/status register - enable/check specific interrupt types */
+#define RTL8365MB_INTR_CTRL_REG			0x1101
+#define RTL8365MB_INTR_STATUS_REG		0x1102
+#define   RTL8365MB_INTR_SLIENT_START_2_MASK	0x1000
+#define   RTL8365MB_INTR_SLIENT_START_MASK	0x0800
+#define   RTL8365MB_INTR_ACL_ACTION_MASK	0x0200
+#define   RTL8365MB_INTR_CABLE_DIAG_FIN_MASK	0x0100
+#define   RTL8365MB_INTR_INTERRUPT_8051_MASK	0x0080
+#define   RTL8365MB_INTR_LOOP_DETECTION_MASK	0x0040
+#define   RTL8365MB_INTR_GREEN_TIMER_MASK	0x0020
+#define   RTL8365MB_INTR_SPECIAL_CONGEST_MASK	0x0010
+#define   RTL8365MB_INTR_SPEED_CHANGE_MASK	0x0008
+#define   RTL8365MB_INTR_LEARN_OVER_MASK	0x0004
+#define   RTL8365MB_INTR_METER_EXCEEDED_MASK	0x0002
+#define   RTL8365MB_INTR_LINK_CHANGE_MASK	0x0001
+#define   RTL8365MB_INTR_ALL_MASK                      \
+		(RTL8365MB_INTR_SLIENT_START_2_MASK |  \
+		 RTL8365MB_INTR_SLIENT_START_MASK |    \
+		 RTL8365MB_INTR_ACL_ACTION_MASK |      \
+		 RTL8365MB_INTR_CABLE_DIAG_FIN_MASK |  \
+		 RTL8365MB_INTR_INTERRUPT_8051_MASK |  \
+		 RTL8365MB_INTR_LOOP_DETECTION_MASK |  \
+		 RTL8365MB_INTR_GREEN_TIMER_MASK |     \
+		 RTL8365MB_INTR_SPECIAL_CONGEST_MASK | \
+		 RTL8365MB_INTR_SPEED_CHANGE_MASK |    \
+		 RTL8365MB_INTR_LEARN_OVER_MASK |      \
+		 RTL8365MB_INTR_METER_EXCEEDED_MASK |  \
+		 RTL8365MB_INTR_LINK_CHANGE_MASK)
+
+/* Per-port interrupt type status registers */
+#define RTL8365MB_PORT_LINKDOWN_IND_REG		0x1106
+#define   RTL8365MB_PORT_LINKDOWN_IND_MASK	0x07FF
+
+#define RTL8365MB_PORT_LINKUP_IND_REG		0x1107
+#define   RTL8365MB_PORT_LINKUP_IND_MASK	0x07FF
+
+/* PHY indirect access registers */
+#define RTL8365MB_INDIRECT_ACCESS_CTRL_REG			0x1F00
+#define   RTL8365MB_INDIRECT_ACCESS_CTRL_RW_MASK		0x0002
+#define   RTL8365MB_INDIRECT_ACCESS_CTRL_RW_READ		0
+#define   RTL8365MB_INDIRECT_ACCESS_CTRL_RW_WRITE		1
+#define   RTL8365MB_INDIRECT_ACCESS_CTRL_CMD_MASK		0x0001
+#define   RTL8365MB_INDIRECT_ACCESS_CTRL_CMD_VALUE		1
+#define RTL8365MB_INDIRECT_ACCESS_STATUS_REG			0x1F01
+#define RTL8365MB_INDIRECT_ACCESS_ADDRESS_REG			0x1F02
+#define   RTL8365MB_INDIRECT_ACCESS_ADDRESS_OCPADR_5_1_MASK	GENMASK(4, 0)
+#define   RTL8365MB_INDIRECT_ACCESS_ADDRESS_PHYNUM_MASK		GENMASK(6, 5)
+#define   RTL8365MB_INDIRECT_ACCESS_ADDRESS_OCPADR_9_6_MASK	GENMASK(11, 8)
+#define   RTL8365MB_PHY_BASE					0x2000
+#define RTL8365MB_INDIRECT_ACCESS_WRITE_DATA_REG		0x1F03
+#define RTL8365MB_INDIRECT_ACCESS_READ_DATA_REG			0x1F04
+
+/* PHY OCP address prefix register */
+#define RTL8365MB_GPHY_OCP_MSB_0_REG			0x1D15
+#define   RTL8365MB_GPHY_OCP_MSB_0_CFG_CPU_OCPADR_MASK	0x0FC0
+#define RTL8365MB_PHY_OCP_ADDR_PREFIX_MASK		0xFC00
+
+/* The PHY OCP addresses of PHY registers 0~31 start here */
+#define RTL8365MB_PHY_OCP_ADDR_PHYREG_BASE		0xA400
+
+/* EXT port interface mode values - used in DIGITAL_INTERFACE_SELECT */
+#define RTL8365MB_EXT_PORT_MODE_DISABLE		0
+#define RTL8365MB_EXT_PORT_MODE_RGMII		1
+#define RTL8365MB_EXT_PORT_MODE_MII_MAC		2
+#define RTL8365MB_EXT_PORT_MODE_MII_PHY		3
+#define RTL8365MB_EXT_PORT_MODE_TMII_MAC	4
+#define RTL8365MB_EXT_PORT_MODE_TMII_PHY	5
+#define RTL8365MB_EXT_PORT_MODE_GMII		6
+#define RTL8365MB_EXT_PORT_MODE_RMII_MAC	7
+#define RTL8365MB_EXT_PORT_MODE_RMII_PHY	8
+#define RTL8365MB_EXT_PORT_MODE_SGMII		9
+#define RTL8365MB_EXT_PORT_MODE_HSGMII		10
+#define RTL8365MB_EXT_PORT_MODE_1000X_100FX	11
+#define RTL8365MB_EXT_PORT_MODE_1000X		12
+#define RTL8365MB_EXT_PORT_MODE_100FX		13
+
+/* EXT port interface mode configuration registers 0~1 */
+#define RTL8365MB_DIGITAL_INTERFACE_SELECT_REG0		0x1305
+#define RTL8365MB_DIGITAL_INTERFACE_SELECT_REG1		0x13C3
+#define RTL8365MB_DIGITAL_INTERFACE_SELECT_REG(_extport)   \
+		(RTL8365MB_DIGITAL_INTERFACE_SELECT_REG0 + \
+		 ((_extport) >> 1) * (0x13C3 - 0x1305))
+#define   RTL8365MB_DIGITAL_INTERFACE_SELECT_MODE_MASK(_extport) \
+		(0xF << (((_extport) % 2)))
+#define   RTL8365MB_DIGITAL_INTERFACE_SELECT_MODE_OFFSET(_extport) \
+		(((_extport) % 2) * 4)
+
+/* EXT port RGMII TX/RX delay configuration registers 1~2 */
+#define RTL8365MB_EXT_RGMXF_REG1		0x1307
+#define RTL8365MB_EXT_RGMXF_REG2		0x13C5
+#define RTL8365MB_EXT_RGMXF_REG(_extport)   \
+		(RTL8365MB_EXT_RGMXF_REG1 + \
+		 (((_extport) >> 1) * (0x13C5 - 0x1307)))
+#define   RTL8365MB_EXT_RGMXF_RXDELAY_MASK	0x0007
+#define   RTL8365MB_EXT_RGMXF_TXDELAY_MASK	0x0008
+
+/* External port speed values - used in DIGITAL_INTERFACE_FORCE */
+#define RTL8365MB_PORT_SPEED_10M	0
+#define RTL8365MB_PORT_SPEED_100M	1
+#define RTL8365MB_PORT_SPEED_1000M	2
+
+/* EXT port force configuration registers 0~2 */
+#define RTL8365MB_DIGITAL_INTERFACE_FORCE_REG0			0x1310
+#define RTL8365MB_DIGITAL_INTERFACE_FORCE_REG1			0x1311
+#define RTL8365MB_DIGITAL_INTERFACE_FORCE_REG2			0x13C4
+#define RTL8365MB_DIGITAL_INTERFACE_FORCE_REG(_extport)   \
+		(RTL8365MB_DIGITAL_INTERFACE_FORCE_REG0 + \
+		 ((_extport) & 0x1) +                     \
+		 ((((_extport) >> 1) & 0x1) * (0x13C4 - 0x1310)))
+#define   RTL8365MB_DIGITAL_INTERFACE_FORCE_EN_MASK		0x1000
+#define   RTL8365MB_DIGITAL_INTERFACE_FORCE_NWAY_MASK		0x0080
+#define   RTL8365MB_DIGITAL_INTERFACE_FORCE_TXPAUSE_MASK	0x0040
+#define   RTL8365MB_DIGITAL_INTERFACE_FORCE_RXPAUSE_MASK	0x0020
+#define   RTL8365MB_DIGITAL_INTERFACE_FORCE_LINK_MASK		0x0010
+#define   RTL8365MB_DIGITAL_INTERFACE_FORCE_DUPLEX_MASK		0x0004
+#define   RTL8365MB_DIGITAL_INTERFACE_FORCE_SPEED_MASK		0x0003
+
+/* CPU port mask register - controls which ports are treated as CPU ports */
+#define RTL8365MB_CPU_PORT_MASK_REG	0x1219
+#define   RTL8365MB_CPU_PORT_MASK_MASK	0x07FF
+
+/* CPU control register */
+#define RTL8365MB_CPU_CTRL_REG			0x121A
+#define   RTL8365MB_CPU_CTRL_TRAP_PORT_EXT_MASK	0x0400
+#define   RTL8365MB_CPU_CTRL_TAG_FORMAT_MASK	0x0200
+#define   RTL8365MB_CPU_CTRL_RXBYTECOUNT_MASK	0x0080
+#define   RTL8365MB_CPU_CTRL_TAG_POSITION_MASK	0x0040
+#define   RTL8365MB_CPU_CTRL_TRAP_PORT_MASK	0x0038
+#define   RTL8365MB_CPU_CTRL_INSERTMODE_MASK	0x0006
+#define   RTL8365MB_CPU_CTRL_EN_MASK		0x0001
+
+/* Maximum packet length register */
+#define RTL8365MB_CFG0_MAX_LEN_REG	0x088C
+#define   RTL8365MB_CFG0_MAX_LEN_MASK	0x3FFF
+
+/* Port learning limit registers */
+#define RTL8365MB_LUT_PORT_LEARN_LIMIT_BASE		0x0A20
+#define RTL8365MB_LUT_PORT_LEARN_LIMIT_REG(_physport) \
+		(RTL8365MB_LUT_PORT_LEARN_LIMIT_BASE + (_physport))
+
+/* Port isolation (forwarding mask) registers */
+#define RTL8365MB_PORT_ISOLATION_REG_BASE		0x08A2
+#define RTL8365MB_PORT_ISOLATION_REG(_physport) \
+		(RTL8365MB_PORT_ISOLATION_REG_BASE + (_physport))
+#define   RTL8365MB_PORT_ISOLATION_MASK			0x07FF
+
+/* MSTP port state registers - indexed by tree instancrSTI (tree ine */
+#define RTL8365MB_MSTI_CTRL_BASE			0x0A00
+#define RTL8365MB_MSTI_CTRL_REG(_msti, _physport) \
+		(RTL8365MB_MSTI_CTRL_BASE + ((_msti) << 1) + ((_physport) >> 3))
+#define   RTL8365MB_MSTI_CTRL_PORT_STATE_OFFSET(_physport) ((_physport) << 1)
+#define   RTL8365MB_MSTI_CTRL_PORT_STATE_MASK(_physport) \
+		(0x3 << RTL8365MB_MSTI_CTRL_PORT_STATE_OFFSET((_physport)))
+
+/* MIB counter value registers */
+#define RTL8365MB_MIB_COUNTER_BASE	0x1000
+#define RTL8365MB_MIB_COUNTER_REG(_x)	(RTL8365MB_MIB_COUNTER_BASE + (_x))
+
+/* MIB counter address register */
+#define RTL8365MB_MIB_ADDRESS_REG		0x1004
+#define   RTL8365MB_MIB_ADDRESS_PORT_OFFSET	0x007C
+#define   RTL8365MB_MIB_ADDRESS(_p, _x) \
+		(((RTL8365MB_MIB_ADDRESS_PORT_OFFSET) * (_p) + (_x)) >> 2)
+
+#define RTL8365MB_MIB_CTRL0_REG			0x1005
+#define   RTL8365MB_MIB_CTRL0_RESET_MASK	0x0002
+#define   RTL8365MB_MIB_CTRL0_BUSY_MASK		0x0001
+
+/* The DSA callback .get_stats64 runs in atomic context, so we are not allowed
+ * to block. On the other hand, accessing MIB counters absolutely requires us to
+ * block. The solution is thus to schedule work which polls the MIB counters
+ * asynchronously and updates some private data, which the callback can then
+ * fetch atomically. Three seconds should be a good enough polling interval.
+ */
+#define RTL8365MB_STATS_INTERVAL_JIFFIES	(3 * HZ)
+
+enum rtl8365mb_mib_counter_index {
+	RTL8365MB_MIB_ifInOctets,
+	RTL8365MB_MIB_dot3StatsFCSErrors,
+	RTL8365MB_MIB_dot3StatsSymbolErrors,
+	RTL8365MB_MIB_dot3InPauseFrames,
+	RTL8365MB_MIB_dot3ControlInUnknownOpcodes,
+	RTL8365MB_MIB_etherStatsFragments,
+	RTL8365MB_MIB_etherStatsJabbers,
+	RTL8365MB_MIB_ifInUcastPkts,
+	RTL8365MB_MIB_etherStatsDropEvents,
+	RTL8365MB_MIB_ifInMulticastPkts,
+	RTL8365MB_MIB_ifInBroadcastPkts,
+	RTL8365MB_MIB_inMldChecksumError,
+	RTL8365MB_MIB_inIgmpChecksumError,
+	RTL8365MB_MIB_inMldSpecificQuery,
+	RTL8365MB_MIB_inMldGeneralQuery,
+	RTL8365MB_MIB_inIgmpSpecificQuery,
+	RTL8365MB_MIB_inIgmpGeneralQuery,
+	RTL8365MB_MIB_inMldLeaves,
+	RTL8365MB_MIB_inIgmpLeaves,
+	RTL8365MB_MIB_etherStatsOctets,
+	RTL8365MB_MIB_etherStatsUnderSizePkts,
+	RTL8365MB_MIB_etherOversizeStats,
+	RTL8365MB_MIB_etherStatsPkts64Octets,
+	RTL8365MB_MIB_etherStatsPkts65to127Octets,
+	RTL8365MB_MIB_etherStatsPkts128to255Octets,
+	RTL8365MB_MIB_etherStatsPkts256to511Octets,
+	RTL8365MB_MIB_etherStatsPkts512to1023Octets,
+	RTL8365MB_MIB_etherStatsPkts1024to1518Octets,
+	RTL8365MB_MIB_ifOutOctets,
+	RTL8365MB_MIB_dot3StatsSingleCollisionFrames,
+	RTL8365MB_MIB_dot3StatsMultipleCollisionFrames,
+	RTL8365MB_MIB_dot3StatsDeferredTransmissions,
+	RTL8365MB_MIB_dot3StatsLateCollisions,
+	RTL8365MB_MIB_etherStatsCollisions,
+	RTL8365MB_MIB_dot3StatsExcessiveCollisions,
+	RTL8365MB_MIB_dot3OutPauseFrames,
+	RTL8365MB_MIB_ifOutDiscards,
+	RTL8365MB_MIB_dot1dTpPortInDiscards,
+	RTL8365MB_MIB_ifOutUcastPkts,
+	RTL8365MB_MIB_ifOutMulticastPkts,
+	RTL8365MB_MIB_ifOutBroadcastPkts,
+	RTL8365MB_MIB_outOampduPkts,
+	RTL8365MB_MIB_inOampduPkts,
+	RTL8365MB_MIB_inIgmpJoinsSuccess,
+	RTL8365MB_MIB_inIgmpJoinsFail,
+	RTL8365MB_MIB_inMldJoinsSuccess,
+	RTL8365MB_MIB_inMldJoinsFail,
+	RTL8365MB_MIB_inReportSuppressionDrop,
+	RTL8365MB_MIB_inLeaveSuppressionDrop,
+	RTL8365MB_MIB_outIgmpReports,
+	RTL8365MB_MIB_outIgmpLeaves,
+	RTL8365MB_MIB_outIgmpGeneralQuery,
+	RTL8365MB_MIB_outIgmpSpecificQuery,
+	RTL8365MB_MIB_outMldReports,
+	RTL8365MB_MIB_outMldLeaves,
+	RTL8365MB_MIB_outMldGeneralQuery,
+	RTL8365MB_MIB_outMldSpecificQuery,
+	RTL8365MB_MIB_inKnownMulticastPkts,
+	RTL8365MB_MIB_END,
+};
+
+struct rtl8365mb_mib_counter {
+	u32 offset;
+	u32 length;
+	const char *name;
+};
+
+#define RTL8365MB_MAKE_MIB_COUNTER(_offset, _length, _name) \
+		[RTL8365MB_MIB_ ## _name] = { _offset, _length, #_name }
+
+static struct rtl8365mb_mib_counter rtl8365mb_mib_counters[] = {
+	RTL8365MB_MAKE_MIB_COUNTER(0, 4, ifInOctets),
+	RTL8365MB_MAKE_MIB_COUNTER(4, 2, dot3StatsFCSErrors),
+	RTL8365MB_MAKE_MIB_COUNTER(6, 2, dot3StatsSymbolErrors),
+	RTL8365MB_MAKE_MIB_COUNTER(8, 2, dot3InPauseFrames),
+	RTL8365MB_MAKE_MIB_COUNTER(10, 2, dot3ControlInUnknownOpcodes),
+	RTL8365MB_MAKE_MIB_COUNTER(12, 2, etherStatsFragments),
+	RTL8365MB_MAKE_MIB_COUNTER(14, 2, etherStatsJabbers),
+	RTL8365MB_MAKE_MIB_COUNTER(16, 2, ifInUcastPkts),
+	RTL8365MB_MAKE_MIB_COUNTER(18, 2, etherStatsDropEvents),
+	RTL8365MB_MAKE_MIB_COUNTER(20, 2, ifInMulticastPkts),
+	RTL8365MB_MAKE_MIB_COUNTER(22, 2, ifInBroadcastPkts),
+	RTL8365MB_MAKE_MIB_COUNTER(24, 2, inMldChecksumError),
+	RTL8365MB_MAKE_MIB_COUNTER(26, 2, inIgmpChecksumError),
+	RTL8365MB_MAKE_MIB_COUNTER(28, 2, inMldSpecificQuery),
+	RTL8365MB_MAKE_MIB_COUNTER(30, 2, inMldGeneralQuery),
+	RTL8365MB_MAKE_MIB_COUNTER(32, 2, inIgmpSpecificQuery),
+	RTL8365MB_MAKE_MIB_COUNTER(34, 2, inIgmpGeneralQuery),
+	RTL8365MB_MAKE_MIB_COUNTER(36, 2, inMldLeaves),
+	RTL8365MB_MAKE_MIB_COUNTER(38, 2, inIgmpLeaves),
+	RTL8365MB_MAKE_MIB_COUNTER(40, 4, etherStatsOctets),
+	RTL8365MB_MAKE_MIB_COUNTER(44, 2, etherStatsUnderSizePkts),
+	RTL8365MB_MAKE_MIB_COUNTER(46, 2, etherOversizeStats),
+	RTL8365MB_MAKE_MIB_COUNTER(48, 2, etherStatsPkts64Octets),
+	RTL8365MB_MAKE_MIB_COUNTER(50, 2, etherStatsPkts65to127Octets),
+	RTL8365MB_MAKE_MIB_COUNTER(52, 2, etherStatsPkts128to255Octets),
+	RTL8365MB_MAKE_MIB_COUNTER(54, 2, etherStatsPkts256to511Octets),
+	RTL8365MB_MAKE_MIB_COUNTER(56, 2, etherStatsPkts512to1023Octets),
+	RTL8365MB_MAKE_MIB_COUNTER(58, 2, etherStatsPkts1024to1518Octets),
+	RTL8365MB_MAKE_MIB_COUNTER(60, 4, ifOutOctets),
+	RTL8365MB_MAKE_MIB_COUNTER(64, 2, dot3StatsSingleCollisionFrames),
+	RTL8365MB_MAKE_MIB_COUNTER(66, 2, dot3StatsMultipleCollisionFrames),
+	RTL8365MB_MAKE_MIB_COUNTER(68, 2, dot3StatsDeferredTransmissions),
+	RTL8365MB_MAKE_MIB_COUNTER(70, 2, dot3StatsLateCollisions),
+	RTL8365MB_MAKE_MIB_COUNTER(72, 2, etherStatsCollisions),
+	RTL8365MB_MAKE_MIB_COUNTER(74, 2, dot3StatsExcessiveCollisions),
+	RTL8365MB_MAKE_MIB_COUNTER(76, 2, dot3OutPauseFrames),
+	RTL8365MB_MAKE_MIB_COUNTER(78, 2, ifOutDiscards),
+	RTL8365MB_MAKE_MIB_COUNTER(80, 2, dot1dTpPortInDiscards),
+	RTL8365MB_MAKE_MIB_COUNTER(82, 2, ifOutUcastPkts),
+	RTL8365MB_MAKE_MIB_COUNTER(84, 2, ifOutMulticastPkts),
+	RTL8365MB_MAKE_MIB_COUNTER(86, 2, ifOutBroadcastPkts),
+	RTL8365MB_MAKE_MIB_COUNTER(88, 2, outOampduPkts),
+	RTL8365MB_MAKE_MIB_COUNTER(90, 2, inOampduPkts),
+	RTL8365MB_MAKE_MIB_COUNTER(92, 4, inIgmpJoinsSuccess),
+	RTL8365MB_MAKE_MIB_COUNTER(96, 2, inIgmpJoinsFail),
+	RTL8365MB_MAKE_MIB_COUNTER(98, 2, inMldJoinsSuccess),
+	RTL8365MB_MAKE_MIB_COUNTER(100, 2, inMldJoinsFail),
+	RTL8365MB_MAKE_MIB_COUNTER(102, 2, inReportSuppressionDrop),
+	RTL8365MB_MAKE_MIB_COUNTER(104, 2, inLeaveSuppressionDrop),
+	RTL8365MB_MAKE_MIB_COUNTER(106, 2, outIgmpReports),
+	RTL8365MB_MAKE_MIB_COUNTER(108, 2, outIgmpLeaves),
+	RTL8365MB_MAKE_MIB_COUNTER(110, 2, outIgmpGeneralQuery),
+	RTL8365MB_MAKE_MIB_COUNTER(112, 2, outIgmpSpecificQuery),
+	RTL8365MB_MAKE_MIB_COUNTER(114, 2, outMldReports),
+	RTL8365MB_MAKE_MIB_COUNTER(116, 2, outMldLeaves),
+	RTL8365MB_MAKE_MIB_COUNTER(118, 2, outMldGeneralQuery),
+	RTL8365MB_MAKE_MIB_COUNTER(120, 2, outMldSpecificQuery),
+	RTL8365MB_MAKE_MIB_COUNTER(122, 2, inKnownMulticastPkts),
+};
+
+static_assert(ARRAY_SIZE(rtl8365mb_mib_counters) == RTL8365MB_MIB_END);
+
+struct rtl8365mb_jam_tbl_entry {
+	u16 reg;
+	u16 val;
+};
+
+/* Lifted from the vendor driver sources */
+static const struct rtl8365mb_jam_tbl_entry rtl8365mb_init_jam_8365mb_vc[] = {
+	{ 0x13EB, 0x15BB }, { 0x1303, 0x06D6 }, { 0x1304, 0x0700 },
+	{ 0x13E2, 0x003F }, { 0x13F9, 0x0090 }, { 0x121E, 0x03CA },
+	{ 0x1233, 0x0352 }, { 0x1237, 0x00A0 }, { 0x123A, 0x0030 },
+	{ 0x1239, 0x0084 }, { 0x0301, 0x1000 }, { 0x1349, 0x001F },
+	{ 0x18E0, 0x4004 }, { 0x122B, 0x241C }, { 0x1305, 0xC000 },
+	{ 0x13F0, 0x0000 },
+};
+
+static const struct rtl8365mb_jam_tbl_entry rtl8365mb_init_jam_common[] = {
+	{ 0x1200, 0x7FCB }, { 0x0884, 0x0003 }, { 0x06EB, 0x0001 },
+	{ 0x03Fa, 0x0007 }, { 0x08C8, 0x00C0 }, { 0x0A30, 0x020E },
+	{ 0x0800, 0x0000 }, { 0x0802, 0x0000 }, { 0x09DA, 0x0013 },
+	{ 0x1D32, 0x0002 },
+};
+
+enum rtl8365mb_stp_state {
+	RTL8365MB_STP_STATE_DISABLED = 0,
+	RTL8365MB_STP_STATE_BLOCKING = 1,
+	RTL8365MB_STP_STATE_LEARNING = 2,
+	RTL8365MB_STP_STATE_FORWARDING = 3,
+};
+
+enum rtl8365mb_cpu_insert {
+	RTL8365MB_CPU_INSERT_TO_ALL = 0,
+	RTL8365MB_CPU_INSERT_TO_TRAPPING = 1,
+	RTL8365MB_CPU_INSERT_TO_NONE = 2,
+};
+
+enum rtl8365mb_cpu_position {
+	RTL8365MB_CPU_POS_AFTER_SA = 0,
+	RTL8365MB_CPU_POS_BEFORE_CRC = 1,
+};
+
+enum rtl8365mb_cpu_format {
+	RTL8365MB_CPU_FORMAT_8BYTES = 0,
+	RTL8365MB_CPU_FORMAT_4BYTES = 1,
+};
+
+enum rtl8365mb_cpu_rxlen {
+	RTL8365MB_CPU_RXLEN_72BYTES = 0,
+	RTL8365MB_CPU_RXLEN_64BYTES = 1,
+};
+
+/**
+ * struct rtl8365mb_cpu - CPU port configuration
+ * @enable: enable/disable hardware insertion of CPU tag in switch->CPU frames
+ * @mask: port mask of ports that parse should parse CPU tags
+ * @trap_port: forward trapped frames to this port
+ * @insert: CPU tag insertion mode in switch->CPU frames
+ * @position: position of CPU tag in frame
+ * @rx_length: minimum CPU RX length
+ * @format: CPU tag format
+ *
+ * Represents the CPU tagging and CPU port configuration of the switch. These
+ * settings are configurable at runtime.
+ */
+struct rtl8365mb_cpu {
+	bool enable;
+	u32 mask;
+	u32 trap_port;
+	enum rtl8365mb_cpu_insert insert;
+	enum rtl8365mb_cpu_position position;
+	enum rtl8365mb_cpu_rxlen rx_length;
+	enum rtl8365mb_cpu_format format;
+};
+
+/**
+ * struct rtl8365mb_port - private per-port data
+ * @smi: pointer to parent realtek_smi data
+ * @index: DSA port index, same as dsa_port::index
+ * @stats: link statistics populated by rtl8365mb_stats_poll, ready for atomic
+ *         access via rtl8365mb_get_stats64
+ * @stats_lock: protect the stats structure during read/update
+ * @mib_work: delayed work for polling MIB counters
+ */
+struct rtl8365mb_port {
+	struct realtek_smi *smi;
+	unsigned int index;
+	struct rtnl_link_stats64 stats;
+	spinlock_t stats_lock;
+	struct delayed_work mib_work;
+};
+
+/**
+ * struct rtl8365mb - private chip-specific driver data
+ * @smi: pointer to parent realtek_smi data
+ * @irq: registered IRQ or zero
+ * @chip_id: chip identifier
+ * @chip_ver: chip silicon revision
+ * @port_mask: mask of all ports
+ * @learn_limit_max: maximum number of L2 addresses the chip can learn
+ * @cpu: CPU tagging and CPU port configuration for this chip
+ * @mib_lock: prevent concurrent reads of MIB counters
+ * @ports: per-port data
+ * @jam_table: chip-specific initialization jam table
+ * @jam_size: size of the chip's jam table
+ *
+ * Private data for this driver.
+ */
+struct rtl8365mb {
+	struct realtek_smi *smi;
+	int irq;
+	u32 chip_id;
+	u32 chip_ver;
+	u32 port_mask;
+	u32 learn_limit_max;
+	struct rtl8365mb_cpu cpu;
+	struct mutex mib_lock;
+	struct rtl8365mb_port ports[RTL8365MB_MAX_NUM_PORTS];
+	const struct rtl8365mb_jam_tbl_entry *jam_table;
+	size_t jam_size;
+};
+
+static int rtl8365mb_phy_poll_busy(struct realtek_smi *smi)
+{
+	u32 val;
+
+	return regmap_read_poll_timeout(smi->map,
+					RTL8365MB_INDIRECT_ACCESS_STATUS_REG,
+					val, !val, 10, 100);
+}
+
+static int rtl8365mb_phy_ocp_prepare(struct realtek_smi *smi, int phy,
+				     u32 ocp_addr)
+{
+	u32 val;
+	int ret;
+
+	/* Set OCP prefix */
+	val = FIELD_GET(RTL8365MB_PHY_OCP_ADDR_PREFIX_MASK, ocp_addr);
+	ret = regmap_update_bits(
+		smi->map, RTL8365MB_GPHY_OCP_MSB_0_REG,
+		RTL8365MB_GPHY_OCP_MSB_0_CFG_CPU_OCPADR_MASK,
+		FIELD_PREP(RTL8365MB_GPHY_OCP_MSB_0_CFG_CPU_OCPADR_MASK, val));
+	if (ret)
+		return ret;
+
+	/* Set PHY register address */
+	val = RTL8365MB_PHY_BASE;
+	val |= FIELD_PREP(RTL8365MB_INDIRECT_ACCESS_ADDRESS_PHYNUM_MASK, phy);
+	val |= FIELD_PREP(RTL8365MB_INDIRECT_ACCESS_ADDRESS_OCPADR_5_1_MASK,
+			  ocp_addr >> 1);
+	val |= FIELD_PREP(RTL8365MB_INDIRECT_ACCESS_ADDRESS_OCPADR_9_6_MASK,
+			  ocp_addr >> 6);
+	ret = regmap_write(smi->map, RTL8365MB_INDIRECT_ACCESS_ADDRESS_REG,
+			   val);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int rtl8365mb_phy_ocp_read(struct realtek_smi *smi, int phy,
+				  u32 ocp_addr, u16 *data)
+{
+	u32 val;
+	int ret;
+
+	ret = rtl8365mb_phy_poll_busy(smi);
+	if (ret)
+		return ret;
+
+	ret = rtl8365mb_phy_ocp_prepare(smi, phy, ocp_addr);
+	if (ret)
+		return ret;
+
+	/* Execute read operation */
+	val = FIELD_PREP(RTL8365MB_INDIRECT_ACCESS_CTRL_CMD_MASK,
+			 RTL8365MB_INDIRECT_ACCESS_CTRL_CMD_VALUE) |
+	      FIELD_PREP(RTL8365MB_INDIRECT_ACCESS_CTRL_RW_MASK,
+			 RTL8365MB_INDIRECT_ACCESS_CTRL_RW_READ);
+	ret = regmap_write(smi->map, RTL8365MB_INDIRECT_ACCESS_CTRL_REG, val);
+	if (ret)
+		return ret;
+
+	ret = rtl8365mb_phy_poll_busy(smi);
+	if (ret)
+		return ret;
+
+	/* Get PHY register data */
+	ret = regmap_read(smi->map, RTL8365MB_INDIRECT_ACCESS_READ_DATA_REG,
+			  &val);
+	if (ret)
+		return ret;
+
+	*data = val & 0xFFFF;
+
+	return 0;
+}
+
+static int rtl8365mb_phy_ocp_write(struct realtek_smi *smi, int phy,
+				   u32 ocp_addr, u16 data)
+{
+	u32 val;
+	int ret;
+
+	ret = rtl8365mb_phy_poll_busy(smi);
+	if (ret)
+		return ret;
+
+	ret = rtl8365mb_phy_ocp_prepare(smi, phy, ocp_addr);
+	if (ret)
+		return ret;
+
+	/* Set PHY register data */
+	ret = regmap_write(smi->map, RTL8365MB_INDIRECT_ACCESS_WRITE_DATA_REG,
+			   data);
+	if (ret)
+		return ret;
+
+	/* Execute write operation */
+	val = FIELD_PREP(RTL8365MB_INDIRECT_ACCESS_CTRL_CMD_MASK,
+			 RTL8365MB_INDIRECT_ACCESS_CTRL_CMD_VALUE) |
+	      FIELD_PREP(RTL8365MB_INDIRECT_ACCESS_CTRL_RW_MASK,
+			 RTL8365MB_INDIRECT_ACCESS_CTRL_RW_WRITE);
+	ret = regmap_write(smi->map, RTL8365MB_INDIRECT_ACCESS_CTRL_REG, val);
+	if (ret)
+		return ret;
+
+	ret = rtl8365mb_phy_poll_busy(smi);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int rtl8365mb_phy_read(struct realtek_smi *smi, int phy, int regnum)
+{
+	u32 ocp_addr;
+	u16 val;
+	int ret;
+
+	if (regnum > RTL8365MB_PHYREGMAX)
+		return -EINVAL;
+
+	ocp_addr = RTL8365MB_PHY_OCP_ADDR_PHYREG_BASE + regnum * 2;
+
+	ret = rtl8365mb_phy_ocp_read(smi, phy, ocp_addr, &val);
+	if (ret) {
+		dev_err(smi->dev,
+			"failed to read PHY%d reg %02x @ %04x, ret %d\n", phy,
+			regnum, ocp_addr, ret);
+		return ret;
+	}
+
+	dev_dbg(smi->dev, "read PHY%d register 0x%02x @ %04x, val <- %04x\n",
+		phy, regnum, ocp_addr, val);
+
+	return val;
+}
+
+static int rtl8365mb_phy_write(struct realtek_smi *smi, int phy, int regnum,
+			       u16 val)
+{
+	u32 ocp_addr;
+	int ret;
+
+	if (regnum > RTL8365MB_PHYREGMAX)
+		return -EINVAL;
+
+	ocp_addr = RTL8365MB_PHY_OCP_ADDR_PHYREG_BASE + regnum * 2;
+
+	ret = rtl8365mb_phy_ocp_write(smi, phy, ocp_addr, val);
+	if (ret) {
+		dev_err(smi->dev,
+			"failed to write PHY%d reg %02x @ %04x, ret %d\n", phy,
+			regnum, ocp_addr, ret);
+		return ret;
+	}
+
+	dev_dbg(smi->dev, "write PHY%d register 0x%02x @ %04x, val -> %04x\n",
+		phy, regnum, ocp_addr, val);
+
+	return 0;
+}
+
+static enum dsa_tag_protocol
+rtl8365mb_get_tag_protocol(struct dsa_switch *ds, int port,
+			   enum dsa_tag_protocol mp)
+{
+	return DSA_TAG_PROTO_RTL8_4;
+}
+
+static int rtl8365mb_ext_config_rgmii(struct realtek_smi *smi, int port,
+				      phy_interface_t interface)
+{
+	struct device_node *dn;
+	struct dsa_port *dp;
+	int tx_delay = 0;
+	int rx_delay = 0;
+	int ext_port;
+	u32 val;
+	int ret;
+
+	if (port == smi->cpu_port) {
+		ext_port = 1;
+	} else {
+		dev_err(smi->dev, "only one EXT port is currently supported\n");
+		return -EINVAL;
+	}
+
+	dp = dsa_to_port(smi->ds, port);
+	dn = dp->dn;
+
+	/* Set the RGMII TX/RX delay
+	 *
+	 * The Realtek vendor driver indicates the following possible
+	 * configuration settings:
+	 *
+	 *   TX delay:
+	 *     0 = no delay, 1 = 2 ns delay
+	 *   RX delay:
+	 *     0 = no delay, 7 = maximum delay
+	 *     No units are specified, but there are a total of 8 steps.
+	 *
+	 * The vendor driver also states that this must be configured *before*
+	 * forcing the external interface into a particular mode, which is done
+	 * in the rtl8365mb_phylink_mac_link_{up,down} functions.
+	 *
+	 * Only configure an RGMII TX (resp. RX) delay if the
+	 * tx-internal-delay-ps (resp. rx-internal-delay-ps) OF property is
+	 * specified. We ignore the detail of the RGMII interface mode
+	 * (RGMII_{RXID, TXID, etc.}), as this is considered to be a PHY-only
+	 * property.
+	 *
+	 * For the RX delay, we assume that a register value of 4 corresponds to
+	 * 2 ns. But this is just an educated guess, so ignore all other values
+	 * to avoid too much confusion.
+	 */
+	if (!of_property_read_u32(dn, "tx-internal-delay-ps", &val)) {
+		val = val / 1000; /* convert to ns */
+
+		if (val == 0 || val == 2)
+			tx_delay = val / 2;
+		else
+			dev_warn(smi->dev,
+				 "EXT port TX delay must be 0 or 2 ns\n");
+	}
+
+	if (!of_property_read_u32(dn, "rx-internal-delay-ps", &val)) {
+		val = val / 1000; /* convert to ns */
+
+		if (val == 0 || val == 2)
+			rx_delay = val * 2;
+		else
+			dev_warn(smi->dev,
+				 "EXT port RX delay must be 0 to 2 ns\n");
+	}
+
+	ret = regmap_update_bits(
+		smi->map, RTL8365MB_EXT_RGMXF_REG(ext_port),
+		RTL8365MB_EXT_RGMXF_TXDELAY_MASK |
+			RTL8365MB_EXT_RGMXF_RXDELAY_MASK,
+		FIELD_PREP(RTL8365MB_EXT_RGMXF_TXDELAY_MASK, tx_delay) |
+			FIELD_PREP(RTL8365MB_EXT_RGMXF_RXDELAY_MASK, rx_delay));
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(
+		smi->map, RTL8365MB_DIGITAL_INTERFACE_SELECT_REG(ext_port),
+		RTL8365MB_DIGITAL_INTERFACE_SELECT_MODE_MASK(ext_port),
+		RTL8365MB_EXT_PORT_MODE_RGMII
+			<< RTL8365MB_DIGITAL_INTERFACE_SELECT_MODE_OFFSET(
+				   ext_port));
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int rtl8365mb_ext_config_forcemode(struct realtek_smi *smi, int port,
+					  bool link, int speed, int duplex,
+					  bool tx_pause, bool rx_pause)
+{
+	u32 r_tx_pause;
+	u32 r_rx_pause;
+	u32 r_duplex;
+	u32 r_speed;
+	u32 r_link;
+	int ext_port;
+	int val;
+	int ret;
+
+	if (port == smi->cpu_port) {
+		ext_port = 1;
+	} else {
+		dev_err(smi->dev, "only one EXT port is currently supported\n");
+		return -EINVAL;
+	}
+
+	if (link) {
+		/* Force the link up with the desired configuration */
+		r_link = 1;
+		r_rx_pause = rx_pause ? 1 : 0;
+		r_tx_pause = tx_pause ? 1 : 0;
+
+		if (speed == SPEED_1000) {
+			r_speed = RTL8365MB_PORT_SPEED_1000M;
+		} else if (speed == SPEED_100) {
+			r_speed = RTL8365MB_PORT_SPEED_100M;
+		} else if (speed == SPEED_10) {
+			r_speed = RTL8365MB_PORT_SPEED_10M;
+		} else {
+			dev_err(smi->dev, "unsupported port speed %s\n",
+				phy_speed_to_str(speed));
+			return -EINVAL;
+		}
+
+		if (duplex == DUPLEX_FULL) {
+			r_duplex = 1;
+		} else if (duplex == DUPLEX_HALF) {
+			r_duplex = 0;
+		} else {
+			dev_err(smi->dev, "unsupported duplex %s\n",
+				phy_duplex_to_str(duplex));
+			return -EINVAL;
+		}
+	} else {
+		/* Force the link down and reset any programmed configuration */
+		r_link = 0;
+		r_tx_pause = 0;
+		r_rx_pause = 0;
+		r_speed = 0;
+		r_duplex = 0;
+	}
+
+	val = FIELD_PREP(RTL8365MB_DIGITAL_INTERFACE_FORCE_EN_MASK, 1) |
+	      FIELD_PREP(RTL8365MB_DIGITAL_INTERFACE_FORCE_TXPAUSE_MASK,
+			 r_tx_pause) |
+	      FIELD_PREP(RTL8365MB_DIGITAL_INTERFACE_FORCE_RXPAUSE_MASK,
+			 r_rx_pause) |
+	      FIELD_PREP(RTL8365MB_DIGITAL_INTERFACE_FORCE_LINK_MASK, r_link) |
+	      FIELD_PREP(RTL8365MB_DIGITAL_INTERFACE_FORCE_DUPLEX_MASK,
+			 r_duplex) |
+	      FIELD_PREP(RTL8365MB_DIGITAL_INTERFACE_FORCE_SPEED_MASK, r_speed);
+	ret = regmap_write(smi->map,
+			   RTL8365MB_DIGITAL_INTERFACE_FORCE_REG(ext_port),
+			   val);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static bool rtl8365mb_phy_mode_supported(struct dsa_switch *ds, int port,
+					 phy_interface_t interface)
+{
+	if (dsa_is_user_port(ds, port) &&
+	    (interface == PHY_INTERFACE_MODE_NA ||
+	     interface == PHY_INTERFACE_MODE_INTERNAL))
+		/* Internal PHY */
+		return true;
+	else if (dsa_is_cpu_port(ds, port) &&
+		 phy_interface_mode_is_rgmii(interface))
+		/* Extension MAC */
+		return true;
+
+	return false;
+}
+
+static void rtl8365mb_phylink_validate(struct dsa_switch *ds, int port,
+				       unsigned long *supported,
+				       struct phylink_link_state *state)
+{
+	struct realtek_smi *smi = ds->priv;
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0 };
+
+	/* include/linux/phylink.h says:
+	 *     When @state->interface is %PHY_INTERFACE_MODE_NA, phylink
+	 *     expects the MAC driver to return all supported link modes.
+	 */
+	if (state->interface != PHY_INTERFACE_MODE_NA &&
+	    !rtl8365mb_phy_mode_supported(ds, port, state->interface)) {
+		dev_err(smi->dev, "phy mode %s is unsupported on port %d\n",
+			phy_modes(state->interface), port);
+		linkmode_zero(supported);
+		return;
+	}
+
+	phylink_set_port_modes(mask);
+
+	phylink_set(mask, Autoneg);
+	phylink_set(mask, Pause);
+	phylink_set(mask, Asym_Pause);
+
+	phylink_set(mask, 10baseT_Half);
+	phylink_set(mask, 10baseT_Full);
+	phylink_set(mask, 100baseT_Half);
+	phylink_set(mask, 100baseT_Full);
+	phylink_set(mask, 1000baseT_Full);
+
+	linkmode_and(supported, supported, mask);
+	linkmode_and(state->advertising, state->advertising, mask);
+}
+
+static void rtl8365mb_phylink_mac_config(struct dsa_switch *ds, int port,
+					 unsigned int mode,
+					 const struct phylink_link_state *state)
+{
+	struct realtek_smi *smi = ds->priv;
+	int ret;
+
+	if (!rtl8365mb_phy_mode_supported(ds, port, state->interface)) {
+		dev_err(smi->dev, "phy mode %s is unsupported on port %d\n",
+			phy_modes(state->interface), port);
+		return;
+	}
+
+	if (mode != MLO_AN_PHY && mode != MLO_AN_FIXED) {
+		dev_err(smi->dev,
+			"port %d supports only conventional PHY or fixed-link\n",
+			port);
+		return;
+	}
+
+	if (phy_interface_mode_is_rgmii(state->interface)) {
+		ret = rtl8365mb_ext_config_rgmii(smi, port, state->interface);
+		if (ret)
+			dev_err(smi->dev,
+				"failed to configure RGMII mode on port %d: %d\n",
+				port, ret);
+		return;
+	}
+
+	/* TODO: Implement MII and RMII modes, which the RTL8365MB-VC also
+	 * supports
+	 */
+}
+
+static void rtl8365mb_phylink_mac_link_down(struct dsa_switch *ds, int port,
+					    unsigned int mode,
+					    phy_interface_t interface)
+{
+	struct realtek_smi *smi = ds->priv;
+	struct rtl8365mb_port *p;
+	struct rtl8365mb *mb;
+	int ret;
+
+	mb = smi->chip_data;
+	p = &mb->ports[port];
+	cancel_delayed_work_sync(&p->mib_work);
+
+	if (phy_interface_mode_is_rgmii(interface)) {
+		ret = rtl8365mb_ext_config_forcemode(smi, port, false, 0, 0,
+						     false, false);
+		if (ret)
+			dev_err(smi->dev,
+				"failed to reset forced mode on port %d: %d\n",
+				port, ret);
+
+		return;
+	}
+}
+
+static void rtl8365mb_phylink_mac_link_up(struct dsa_switch *ds, int port,
+					  unsigned int mode,
+					  phy_interface_t interface,
+					  struct phy_device *phydev, int speed,
+					  int duplex, bool tx_pause,
+					  bool rx_pause)
+{
+	struct realtek_smi *smi = ds->priv;
+	struct rtl8365mb_port *p;
+	struct rtl8365mb *mb;
+	int ret;
+
+	mb = smi->chip_data;
+	p = &mb->ports[port];
+	schedule_delayed_work(&p->mib_work, 0);
+
+	if (phy_interface_mode_is_rgmii(interface)) {
+		ret = rtl8365mb_ext_config_forcemode(smi, port, true, speed,
+						     duplex, tx_pause,
+						     rx_pause);
+		if (ret)
+			dev_err(smi->dev,
+				"failed to force mode on port %d: %d\n", port,
+				ret);
+
+		return;
+	}
+}
+
+static void rtl8365mb_port_stp_state_set(struct dsa_switch *ds, int port,
+					 u8 state)
+{
+	struct realtek_smi *smi = ds->priv;
+	enum rtl8365mb_stp_state val;
+	int msti = 0;
+
+	switch (state) {
+	case BR_STATE_DISABLED:
+		val = RTL8365MB_STP_STATE_DISABLED;
+		break;
+	case BR_STATE_BLOCKING:
+	case BR_STATE_LISTENING:
+		val = RTL8365MB_STP_STATE_BLOCKING;
+		break;
+	case BR_STATE_LEARNING:
+		val = RTL8365MB_STP_STATE_LEARNING;
+		break;
+	case BR_STATE_FORWARDING:
+		val = RTL8365MB_STP_STATE_FORWARDING;
+		break;
+	default:
+		dev_err(smi->dev, "invalid STP state: %u\n", state);
+		return;
+	}
+
+	regmap_update_bits(smi->map, RTL8365MB_MSTI_CTRL_REG(msti, port),
+			   RTL8365MB_MSTI_CTRL_PORT_STATE_MASK(port),
+			   val << RTL8365MB_MSTI_CTRL_PORT_STATE_OFFSET(port));
+}
+
+static int rtl8365mb_port_set_learning(struct realtek_smi *smi, int port,
+				       bool enable)
+{
+	struct rtl8365mb *mb = smi->chip_data;
+
+	/* Enable/disable learning by limiting the number of L2 addresses the
+	 * port can learn. Realtek documentation states that a limit of zero
+	 * disables learning. When enabling learning, set it to the chip's
+	 * maximum.
+	 */
+	return regmap_write(smi->map, RTL8365MB_LUT_PORT_LEARN_LIMIT_REG(port),
+			    enable ? mb->learn_limit_max : 0);
+}
+
+static int rtl8365mb_port_set_isolation(struct realtek_smi *smi, int port,
+					u32 mask)
+{
+	return regmap_write(smi->map, RTL8365MB_PORT_ISOLATION_REG(port), mask);
+}
+
+static int rtl8365mb_mib_counter_read(struct realtek_smi *smi, int port,
+				      u32 offset, u32 length, u64 *mibvalue)
+{
+	u64 tmpvalue = 0;
+	u32 val;
+	int ret;
+	int i;
+
+	/* The MIB address is an SRAM address. We request a particular address
+	 * and then poll the control register before reading the value from some
+	 * counter registers.
+	 */
+	ret = regmap_write(smi->map, RTL8365MB_MIB_ADDRESS_REG,
+			   RTL8365MB_MIB_ADDRESS(port, offset));
+	if (ret)
+		return ret;
+
+	/* Poll for completion */
+	ret = regmap_read_poll_timeout(smi->map, RTL8365MB_MIB_CTRL0_REG, val,
+				       !(val & RTL8365MB_MIB_CTRL0_BUSY_MASK),
+				       10, 100);
+	if (ret)
+		return ret;
+
+	/* Presumably this indicates a MIB counter read failure */
+	if (val & RTL8365MB_MIB_CTRL0_RESET_MASK)
+		return -EIO;
+
+	/* There are four MIB counter registers each holding a 16 bit word of a
+	 * MIB counter. Depending on the offset, we should read from the upper
+	 * two or lower two registers. In case the MIB counter is 4 words, we
+	 * read from all four registers.
+	 */
+	if (length == 4)
+		offset = 3;
+	else
+		offset = (offset + 1) % 4;
+
+	/* Read the MIB counter 16 bits at a time */
+	for (i = 0; i < length; i++) {
+		ret = regmap_read(smi->map,
+				  RTL8365MB_MIB_COUNTER_REG(offset - i), &val);
+		if (ret)
+			return ret;
+
+		tmpvalue = ((tmpvalue) << 16) | (val & 0xFFFF);
+	}
+
+	/* Only commit the result if no error occurred */
+	*mibvalue = tmpvalue;
+
+	return 0;
+}
+
+static void rtl8365mb_get_ethtool_stats(struct dsa_switch *ds, int port, u64 *data)
+{
+	struct realtek_smi *smi = ds->priv;
+	struct rtl8365mb *mb;
+	int ret;
+	int i;
+
+	mb = smi->chip_data;
+
+	mutex_lock(&mb->mib_lock);
+	for (i = 0; i < RTL8365MB_MIB_END; i++) {
+		struct rtl8365mb_mib_counter *mib = &rtl8365mb_mib_counters[i];
+
+		ret = rtl8365mb_mib_counter_read(smi, port, mib->offset,
+						 mib->length, &data[i]);
+		if (ret) {
+			dev_err(smi->dev,
+				"failed to read port %d counters: %d\n", port,
+				ret);
+			break;
+		}
+	}
+	mutex_unlock(&mb->mib_lock);
+}
+
+static void rtl8365mb_get_strings(struct dsa_switch *ds, int port, u32 stringset, u8 *data)
+{
+	int i;
+
+	if (stringset != ETH_SS_STATS)
+		return;
+
+	for (i = 0; i < RTL8365MB_MIB_END; i++) {
+		struct rtl8365mb_mib_counter *mib = &rtl8365mb_mib_counters[i];
+
+		strncpy(data + i * ETH_GSTRING_LEN, mib->name, ETH_GSTRING_LEN);
+	}
+}
+
+static int rtl8365mb_get_sset_count(struct dsa_switch *ds, int port, int sset)
+{
+	if (sset != ETH_SS_STATS)
+		return -EOPNOTSUPP;
+
+	return RTL8365MB_MIB_END;
+}
+
+static void rtl8365mb_get_phy_stats(struct dsa_switch *ds, int port,
+				    struct ethtool_eth_phy_stats *phy_stats)
+{
+	struct realtek_smi *smi = ds->priv;
+	struct rtl8365mb_mib_counter *mib;
+	struct rtl8365mb *mb;
+
+	mb = smi->chip_data;
+	mib = &rtl8365mb_mib_counters[RTL8365MB_MIB_dot3StatsSymbolErrors];
+
+	mutex_lock(&mb->mib_lock);
+	rtl8365mb_mib_counter_read(smi, port, mib->offset, mib->length,
+				   &phy_stats->SymbolErrorDuringCarrier);
+	mutex_unlock(&mb->mib_lock);
+}
+
+static void rtl8365mb_get_mac_stats(struct dsa_switch *ds, int port,
+				    struct ethtool_eth_mac_stats *mac_stats)
+{
+	u64 cnt[RTL8365MB_MIB_END] = {
+		[RTL8365MB_MIB_ifOutOctets] = 1,
+		[RTL8365MB_MIB_ifOutUcastPkts] = 1,
+		[RTL8365MB_MIB_ifOutMulticastPkts] = 1,
+		[RTL8365MB_MIB_ifOutBroadcastPkts] = 1,
+		[RTL8365MB_MIB_dot3OutPauseFrames] = 1,
+		[RTL8365MB_MIB_ifOutDiscards] = 1,
+		[RTL8365MB_MIB_ifInOctets] = 1,
+		[RTL8365MB_MIB_ifInUcastPkts] = 1,
+		[RTL8365MB_MIB_ifInMulticastPkts] = 1,
+		[RTL8365MB_MIB_ifInBroadcastPkts] = 1,
+		[RTL8365MB_MIB_dot3InPauseFrames] = 1,
+		[RTL8365MB_MIB_dot3StatsSingleCollisionFrames] = 1,
+		[RTL8365MB_MIB_dot3StatsMultipleCollisionFrames] = 1,
+		[RTL8365MB_MIB_dot3StatsFCSErrors] = 1,
+		[RTL8365MB_MIB_dot3StatsDeferredTransmissions] = 1,
+		[RTL8365MB_MIB_dot3StatsLateCollisions] = 1,
+		[RTL8365MB_MIB_dot3StatsExcessiveCollisions] = 1,
+
+	};
+	struct realtek_smi *smi = ds->priv;
+	struct rtl8365mb *mb;
+	int ret;
+	int i;
+
+	mb = smi->chip_data;
+
+	mutex_lock(&mb->mib_lock);
+	for (i = 0; i < RTL8365MB_MIB_END; i++) {
+		struct rtl8365mb_mib_counter *mib = &rtl8365mb_mib_counters[i];
+
+		/* Only fetch required MIB counters (marked = 1 above) */
+		if (!cnt[i])
+			continue;
+
+		ret = rtl8365mb_mib_counter_read(smi, port, mib->offset,
+						 mib->length, &cnt[i]);
+		if (ret)
+			break;
+	}
+	mutex_unlock(&mb->mib_lock);
+
+	/* The RTL8365MB-VC exposes MIB objects, which we have to translate into
+	 * IEEE 802.3 Managed Objects. This is not always completely faithful,
+	 * but we try out best. See RFC 3635 for a detailed treatment of the
+	 * subject.
+	 */
+
+	mac_stats->FramesTransmittedOK = cnt[RTL8365MB_MIB_ifOutUcastPkts] +
+					 cnt[RTL8365MB_MIB_ifOutMulticastPkts] +
+					 cnt[RTL8365MB_MIB_ifOutBroadcastPkts] +
+					 cnt[RTL8365MB_MIB_dot3OutPauseFrames] -
+					 cnt[RTL8365MB_MIB_ifOutDiscards];
+	mac_stats->SingleCollisionFrames =
+		cnt[RTL8365MB_MIB_dot3StatsSingleCollisionFrames];
+	mac_stats->MultipleCollisionFrames =
+		cnt[RTL8365MB_MIB_dot3StatsMultipleCollisionFrames];
+	mac_stats->FramesReceivedOK = cnt[RTL8365MB_MIB_ifInUcastPkts] +
+				      cnt[RTL8365MB_MIB_ifInMulticastPkts] +
+				      cnt[RTL8365MB_MIB_ifInBroadcastPkts] +
+				      cnt[RTL8365MB_MIB_dot3InPauseFrames];
+	mac_stats->FrameCheckSequenceErrors =
+		cnt[RTL8365MB_MIB_dot3StatsFCSErrors];
+	mac_stats->OctetsTransmittedOK = cnt[RTL8365MB_MIB_ifOutOctets] -
+					 18 * mac_stats->FramesTransmittedOK;
+	mac_stats->FramesWithDeferredXmissions =
+		cnt[RTL8365MB_MIB_dot3StatsDeferredTransmissions];
+	mac_stats->LateCollisions = cnt[RTL8365MB_MIB_dot3StatsLateCollisions];
+	mac_stats->FramesAbortedDueToXSColls =
+		cnt[RTL8365MB_MIB_dot3StatsExcessiveCollisions];
+	mac_stats->OctetsReceivedOK = cnt[RTL8365MB_MIB_ifInOctets] -
+				      18 * mac_stats->FramesReceivedOK;
+	mac_stats->MulticastFramesXmittedOK =
+		cnt[RTL8365MB_MIB_ifOutMulticastPkts];
+	mac_stats->BroadcastFramesXmittedOK =
+		cnt[RTL8365MB_MIB_ifOutBroadcastPkts];
+	mac_stats->MulticastFramesReceivedOK =
+		cnt[RTL8365MB_MIB_ifInMulticastPkts];
+	mac_stats->BroadcastFramesReceivedOK =
+		cnt[RTL8365MB_MIB_ifInBroadcastPkts];
+}
+
+static void rtl8365mb_get_ctrl_stats(struct dsa_switch *ds, int port,
+				     struct ethtool_eth_ctrl_stats *ctrl_stats)
+{
+	struct realtek_smi *smi = ds->priv;
+	struct rtl8365mb_mib_counter *mib;
+	struct rtl8365mb *mb;
+
+	mb = smi->chip_data;
+	mib = &rtl8365mb_mib_counters[RTL8365MB_MIB_dot3ControlInUnknownOpcodes];
+
+	mutex_lock(&mb->mib_lock);
+	rtl8365mb_mib_counter_read(smi, port, mib->offset, mib->length,
+				   &ctrl_stats->UnsupportedOpcodesReceived);
+	mutex_unlock(&mb->mib_lock);
+}
+
+static void rtl8365mb_stats_update(struct realtek_smi *smi, int port)
+{
+	u64 cnt[RTL8365MB_MIB_END] = {
+		[RTL8365MB_MIB_ifOutOctets] = 1,
+		[RTL8365MB_MIB_ifOutUcastPkts] = 1,
+		[RTL8365MB_MIB_ifOutMulticastPkts] = 1,
+		[RTL8365MB_MIB_ifOutBroadcastPkts] = 1,
+		[RTL8365MB_MIB_ifOutDiscards] = 1,
+		[RTL8365MB_MIB_ifInOctets] = 1,
+		[RTL8365MB_MIB_ifInUcastPkts] = 1,
+		[RTL8365MB_MIB_ifInMulticastPkts] = 1,
+		[RTL8365MB_MIB_ifInBroadcastPkts] = 1,
+		[RTL8365MB_MIB_etherStatsDropEvents] = 1,
+		[RTL8365MB_MIB_etherStatsCollisions] = 1,
+		[RTL8365MB_MIB_etherStatsFragments] = 1,
+		[RTL8365MB_MIB_etherStatsJabbers] = 1,
+		[RTL8365MB_MIB_dot3StatsFCSErrors] = 1,
+		[RTL8365MB_MIB_dot3StatsLateCollisions] = 1,
+	};
+	struct rtl8365mb *mb = smi->chip_data;
+	struct rtnl_link_stats64 *stats;
+	int ret;
+	int i;
+
+	stats = &mb->ports[port].stats;
+
+	mutex_lock(&mb->mib_lock);
+	for (i = 0; i < RTL8365MB_MIB_END; i++) {
+		struct rtl8365mb_mib_counter *c = &rtl8365mb_mib_counters[i];
+
+		/* Only fetch required MIB counters (marked = 1 above) */
+		if (!cnt[i])
+			continue;
+
+		ret = rtl8365mb_mib_counter_read(smi, port, c->offset,
+						 c->length, &cnt[i]);
+		if (ret)
+			break;
+	}
+	mutex_unlock(&mb->mib_lock);
+
+	/* Don't update statistics if there was an error reading the counters */
+	if (ret)
+		return;
+
+	spin_lock(&mb->ports[port].stats_lock);
+
+	stats->rx_packets = cnt[RTL8365MB_MIB_ifInUcastPkts] +
+			    cnt[RTL8365MB_MIB_ifInMulticastPkts] +
+			    cnt[RTL8365MB_MIB_ifInBroadcastPkts] -
+			    cnt[RTL8365MB_MIB_ifOutDiscards];
+
+	stats->tx_packets = cnt[RTL8365MB_MIB_ifOutUcastPkts] +
+			    cnt[RTL8365MB_MIB_ifOutMulticastPkts] +
+			    cnt[RTL8365MB_MIB_ifOutBroadcastPkts];
+
+	/* if{In,Out}Octets includes FCS - remove it */
+	stats->rx_bytes = cnt[RTL8365MB_MIB_ifInOctets] - 4 * stats->rx_packets;
+	stats->tx_bytes =
+		cnt[RTL8365MB_MIB_ifOutOctets] - 4 * stats->tx_packets;
+
+	stats->rx_dropped = cnt[RTL8365MB_MIB_etherStatsDropEvents];
+	stats->tx_dropped = cnt[RTL8365MB_MIB_ifOutDiscards];
+
+	stats->multicast = cnt[RTL8365MB_MIB_ifInMulticastPkts];
+	stats->collisions = cnt[RTL8365MB_MIB_etherStatsCollisions];
+
+	stats->rx_length_errors = cnt[RTL8365MB_MIB_etherStatsFragments] +
+				  cnt[RTL8365MB_MIB_etherStatsJabbers];
+	stats->rx_crc_errors = cnt[RTL8365MB_MIB_dot3StatsFCSErrors];
+	stats->rx_errors = stats->rx_length_errors + stats->rx_crc_errors;
+
+	stats->tx_aborted_errors = cnt[RTL8365MB_MIB_ifOutDiscards];
+	stats->tx_window_errors = cnt[RTL8365MB_MIB_dot3StatsLateCollisions];
+	stats->tx_errors = stats->tx_aborted_errors + stats->tx_window_errors;
+
+	spin_unlock(&mb->ports[port].stats_lock);
+}
+
+static void rtl8365mb_stats_poll(struct work_struct *work)
+{
+	struct rtl8365mb_port *p = container_of(to_delayed_work(work),
+						struct rtl8365mb_port,
+						mib_work);
+	struct realtek_smi *smi = p->smi;
+
+	rtl8365mb_stats_update(smi, p->index);
+
+	schedule_delayed_work(&p->mib_work, RTL8365MB_STATS_INTERVAL_JIFFIES);
+}
+
+static void rtl8365mb_get_stats64(struct dsa_switch *ds, int port,
+				  struct rtnl_link_stats64 *s)
+{
+	struct realtek_smi *smi = ds->priv;
+	struct rtl8365mb_port *p;
+	struct rtl8365mb *mb;
+
+	mb = smi->chip_data;
+	p = &mb->ports[port];
+
+	spin_lock(&p->stats_lock);
+	memcpy(s, &p->stats, sizeof(*s));
+	spin_unlock(&p->stats_lock);
+}
+
+static void rtl8365mb_stats_setup(struct realtek_smi *smi)
+{
+	struct rtl8365mb *mb = smi->chip_data;
+	int i;
+
+	/* Per-chip global mutex to protect MIB counter access, since doing
+	 * so requires accessing a series of registers in a particular order.
+	 */
+	mutex_init(&mb->mib_lock);
+
+	for (i = 0; i < smi->num_ports; i++) {
+		struct rtl8365mb_port *p = &mb->ports[i];
+
+		if (dsa_is_unused_port(smi->ds, i))
+			continue;
+
+		/* Per-port spinlock to protect the stats64 data */
+		spin_lock_init(&p->stats_lock);
+
+		/* This work polls the MIB counters and keeps the stats64 data
+		 * up-to-date.
+		 */
+		INIT_DELAYED_WORK(&p->mib_work, rtl8365mb_stats_poll);
+	}
+}
+
+static void rtl8365mb_stats_teardown(struct realtek_smi *smi)
+{
+	struct rtl8365mb *mb = smi->chip_data;
+	int i;
+
+	for (i = 0; i < smi->num_ports; i++) {
+		struct rtl8365mb_port *p = &mb->ports[i];
+
+		if (dsa_is_unused_port(smi->ds, i))
+			continue;
+
+		cancel_delayed_work_sync(&p->mib_work);
+	}
+}
+
+static int rtl8365mb_get_and_clear_status_reg(struct realtek_smi *smi, u32 reg,
+					      u32 *val)
+{
+	int ret;
+
+	ret = regmap_read(smi->map, reg, val);
+	if (ret)
+		return ret;
+
+	return regmap_write(smi->map, reg, *val);
+}
+
+static irqreturn_t rtl8365mb_irq(int irq, void *data)
+{
+	struct realtek_smi *smi = data;
+	unsigned long line_changes = 0;
+	struct rtl8365mb *mb;
+	u32 stat;
+	int line;
+	int ret;
+
+	mb = smi->chip_data;
+
+	ret = rtl8365mb_get_and_clear_status_reg(smi, RTL8365MB_INTR_STATUS_REG,
+						 &stat);
+	if (ret)
+		goto out_error;
+
+	if (stat & RTL8365MB_INTR_LINK_CHANGE_MASK) {
+		u32 linkdown_ind;
+		u32 linkup_ind;
+		u32 val;
+
+		ret = rtl8365mb_get_and_clear_status_reg(
+			smi, RTL8365MB_PORT_LINKUP_IND_REG, &val);
+		if (ret)
+			goto out_error;
+
+		linkup_ind = FIELD_GET(RTL8365MB_PORT_LINKUP_IND_MASK, val);
+
+		ret = rtl8365mb_get_and_clear_status_reg(
+			smi, RTL8365MB_PORT_LINKDOWN_IND_REG, &val);
+		if (ret)
+			goto out_error;
+
+		linkdown_ind = FIELD_GET(RTL8365MB_PORT_LINKDOWN_IND_MASK, val);
+
+		line_changes = (linkup_ind | linkdown_ind) & mb->port_mask;
+	}
+
+	if (!line_changes)
+		goto out_none;
+
+	for_each_set_bit(line, &line_changes, smi->num_ports) {
+		int child_irq = irq_find_mapping(smi->irqdomain, line);
+
+		handle_nested_irq(child_irq);
+	}
+
+	return IRQ_HANDLED;
+
+out_error:
+	dev_err(smi->dev, "failed to read interrupt status: %d\n", ret);
+
+out_none:
+	return IRQ_NONE;
+}
+
+static struct irq_chip rtl8365mb_irq_chip = {
+	.name = "rtl8365mb",
+	/* The hardware doesn't support masking IRQs on a per-port basis */
+};
+
+static int rtl8365mb_irq_map(struct irq_domain *domain, unsigned int irq,
+			     irq_hw_number_t hwirq)
+{
+	irq_set_chip_data(irq, domain->host_data);
+	irq_set_chip_and_handler(irq, &rtl8365mb_irq_chip, handle_simple_irq);
+	irq_set_nested_thread(irq, 1);
+	irq_set_noprobe(irq);
+
+	return 0;
+}
+
+static void rtl8365mb_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+	irq_set_nested_thread(irq, 0);
+	irq_set_chip_and_handler(irq, NULL, NULL);
+	irq_set_chip_data(irq, NULL);
+}
+
+static const struct irq_domain_ops rtl8365mb_irqdomain_ops = {
+	.map = rtl8365mb_irq_map,
+	.unmap = rtl8365mb_irq_unmap,
+	.xlate = irq_domain_xlate_onecell,
+};
+
+static int rtl8365mb_set_irq_enable(struct realtek_smi *smi, bool enable)
+{
+	return regmap_update_bits(smi->map, RTL8365MB_INTR_CTRL_REG,
+				  RTL8365MB_INTR_LINK_CHANGE_MASK,
+				  FIELD_PREP(RTL8365MB_INTR_LINK_CHANGE_MASK,
+					     enable ? 1 : 0));
+}
+
+static int rtl8365mb_irq_enable(struct realtek_smi *smi)
+{
+	return rtl8365mb_set_irq_enable(smi, true);
+}
+
+static int rtl8365mb_irq_disable(struct realtek_smi *smi)
+{
+	return rtl8365mb_set_irq_enable(smi, false);
+}
+
+static int rtl8365mb_irq_setup(struct realtek_smi *smi)
+{
+	struct rtl8365mb *mb = smi->chip_data;
+	struct device_node *intc;
+	u32 irq_trig;
+	int virq;
+	int irq;
+	u32 val;
+	int ret;
+	int i;
+
+	intc = of_get_child_by_name(smi->dev->of_node, "interrupt-controller");
+	if (!intc) {
+		dev_err(smi->dev, "missing child interrupt-controller node\n");
+		return -EINVAL;
+	}
+
+	/* rtl8365mb IRQs cascade off this one */
+	irq = of_irq_get(intc, 0);
+	if (irq <= 0) {
+		if (irq != -EPROBE_DEFER)
+			dev_err(smi->dev, "failed to get parent irq: %d\n",
+				irq);
+		ret = irq ? irq : -EINVAL;
+		goto out_put_node;
+	}
+
+	smi->irqdomain = irq_domain_add_linear(intc, smi->num_ports,
+					       &rtl8365mb_irqdomain_ops, smi);
+	if (!smi->irqdomain) {
+		dev_err(smi->dev, "failed to add irq domain\n");
+		ret = -ENOMEM;
+		goto out_put_node;
+	}
+
+	for (i = 0; i < smi->num_ports; i++) {
+		virq = irq_create_mapping(smi->irqdomain, i);
+		if (!virq) {
+			dev_err(smi->dev,
+				"failed to create irq domain mapping\n");
+			ret = -EINVAL;
+			goto out_remove_irqdomain;
+		}
+
+		irq_set_parent(virq, irq);
+	}
+
+	/* Configure chip interrupt signal polarity */
+	irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
+	switch (irq_trig) {
+	case IRQF_TRIGGER_RISING:
+	case IRQF_TRIGGER_HIGH:
+		val = RTL8365MB_INTR_POLARITY_HIGH;
+		break;
+	case IRQF_TRIGGER_FALLING:
+	case IRQF_TRIGGER_LOW:
+		val = RTL8365MB_INTR_POLARITY_LOW;
+		break;
+	default:
+		dev_err(smi->dev, "unsupported irq trigger type %u\n",
+			irq_trig);
+		ret = -EINVAL;
+		goto out_remove_irqdomain;
+	}
+
+	ret = regmap_update_bits(smi->map, RTL8365MB_INTR_POLARITY_REG,
+				 RTL8365MB_INTR_POLARITY_MASK,
+				 FIELD_PREP(RTL8365MB_INTR_POLARITY_MASK, val));
+	if (ret)
+		goto out_remove_irqdomain;
+
+	/* Disable the interrupt in case the chip has it enabled on reset */
+	ret = rtl8365mb_irq_disable(smi);
+	if (ret)
+		goto out_remove_irqdomain;
+
+	/* Clear the interrupt status register */
+	ret = regmap_write(smi->map, RTL8365MB_INTR_STATUS_REG,
+			   RTL8365MB_INTR_ALL_MASK);
+	if (ret)
+		goto out_remove_irqdomain;
+
+	ret = request_threaded_irq(irq, NULL, rtl8365mb_irq, IRQF_ONESHOT,
+				   "rtl8365mb", smi);
+	if (ret) {
+		dev_err(smi->dev, "failed to request irq: %d\n", ret);
+		goto out_remove_irqdomain;
+	}
+
+	/* Store the irq so that we know to free it during teardown */
+	mb->irq = irq;
+
+	ret = rtl8365mb_irq_enable(smi);
+	if (ret)
+		goto out_free_irq;
+
+	of_node_put(intc);
+
+	return 0;
+
+out_free_irq:
+	free_irq(mb->irq, smi);
+	mb->irq = 0;
+
+out_remove_irqdomain:
+	for (i = 0; i < smi->num_ports; i++) {
+		virq = irq_find_mapping(smi->irqdomain, i);
+		irq_dispose_mapping(virq);
+	}
+
+	irq_domain_remove(smi->irqdomain);
+	smi->irqdomain = NULL;
+
+out_put_node:
+	of_node_put(intc);
+
+	return ret;
+}
+
+static void rtl8365mb_irq_teardown(struct realtek_smi *smi)
+{
+	struct rtl8365mb *mb = smi->chip_data;
+	int virq;
+	int i;
+
+	if (mb->irq) {
+		free_irq(mb->irq, smi);
+		mb->irq = 0;
+	}
+
+	if (smi->irqdomain) {
+		for (i = 0; i < smi->num_ports; i++) {
+			virq = irq_find_mapping(smi->irqdomain, i);
+			irq_dispose_mapping(virq);
+		}
+
+		irq_domain_remove(smi->irqdomain);
+		smi->irqdomain = NULL;
+	}
+}
+
+static int rtl8365mb_cpu_config(struct realtek_smi *smi)
+{
+	struct rtl8365mb *mb = smi->chip_data;
+	struct rtl8365mb_cpu *cpu = &mb->cpu;
+	u32 val;
+	int ret;
+
+	ret = regmap_update_bits(smi->map, RTL8365MB_CPU_PORT_MASK_REG,
+				 RTL8365MB_CPU_PORT_MASK_MASK,
+				 FIELD_PREP(RTL8365MB_CPU_PORT_MASK_MASK,
+					    cpu->mask));
+	if (ret)
+		return ret;
+
+	val = FIELD_PREP(RTL8365MB_CPU_CTRL_EN_MASK, cpu->enable ? 1 : 0) |
+	      FIELD_PREP(RTL8365MB_CPU_CTRL_INSERTMODE_MASK, cpu->insert) |
+	      FIELD_PREP(RTL8365MB_CPU_CTRL_TAG_POSITION_MASK, cpu->position) |
+	      FIELD_PREP(RTL8365MB_CPU_CTRL_RXBYTECOUNT_MASK, cpu->rx_length) |
+	      FIELD_PREP(RTL8365MB_CPU_CTRL_TAG_FORMAT_MASK, cpu->format) |
+	      FIELD_PREP(RTL8365MB_CPU_CTRL_TRAP_PORT_MASK, cpu->trap_port) |
+	      FIELD_PREP(RTL8365MB_CPU_CTRL_TRAP_PORT_EXT_MASK,
+			 cpu->trap_port >> 3);
+	ret = regmap_write(smi->map, RTL8365MB_CPU_CTRL_REG, val);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int rtl8365mb_switch_init(struct realtek_smi *smi)
+{
+	struct rtl8365mb *mb = smi->chip_data;
+	int ret;
+	int i;
+
+	/* Do any chip-specific init jam before getting to the common stuff */
+	if (mb->jam_table) {
+		for (i = 0; i < mb->jam_size; i++) {
+			ret = regmap_write(smi->map, mb->jam_table[i].reg,
+					   mb->jam_table[i].val);
+			if (ret)
+				return ret;
+		}
+	}
+
+	/* Common init jam */
+	for (i = 0; i < ARRAY_SIZE(rtl8365mb_init_jam_common); i++) {
+		ret = regmap_write(smi->map, rtl8365mb_init_jam_common[i].reg,
+				   rtl8365mb_init_jam_common[i].val);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int rtl8365mb_reset_chip(struct realtek_smi *smi)
+{
+	u32 val;
+
+	realtek_smi_write_reg_noack(smi, RTL8365MB_CHIP_RESET_REG,
+				    FIELD_PREP(RTL8365MB_CHIP_RESET_HW_MASK,
+					       1));
+
+	/* Realtek documentation says the chip needs 1 second to reset. Sleep
+	 * for 100 ms before accessing any registers to prevent ACK timeouts.
+	 */
+	msleep(100);
+	return regmap_read_poll_timeout(smi->map, RTL8365MB_CHIP_RESET_REG, val,
+					!(val & RTL8365MB_CHIP_RESET_HW_MASK),
+					20000, 1e6);
+}
+
+static int rtl8365mb_setup(struct dsa_switch *ds)
+{
+	struct realtek_smi *smi = ds->priv;
+	struct rtl8365mb *mb;
+	int ret;
+	int i;
+
+	mb = smi->chip_data;
+
+	ret = rtl8365mb_reset_chip(smi);
+	if (ret) {
+		dev_err(smi->dev, "failed to reset chip: %d\n", ret);
+		goto out_error;
+	}
+
+	/* Configure switch to vendor-defined initial state */
+	ret = rtl8365mb_switch_init(smi);
+	if (ret) {
+		dev_err(smi->dev, "failed to initialize switch: %d\n", ret);
+		goto out_error;
+	}
+
+	/* Set up cascading IRQs */
+	ret = rtl8365mb_irq_setup(smi);
+	if (ret == -EPROBE_DEFER)
+		return ret;
+	else if (ret)
+		dev_info(smi->dev, "no interrupt support\n");
+
+	/* Configure CPU tagging */
+	ret = rtl8365mb_cpu_config(smi);
+	if (ret)
+		goto out_teardown_irq;
+
+	/* Configure ports */
+	for (i = 0; i < smi->num_ports; i++) {
+		struct rtl8365mb_port *p = &mb->ports[i];
+
+		if (dsa_is_unused_port(smi->ds, i))
+			continue;
+
+		/* Set up per-port private data */
+		p->smi = smi;
+		p->index = i;
+
+		/* Forward only to the CPU */
+		ret = rtl8365mb_port_set_isolation(smi, i, BIT(smi->cpu_port));
+		if (ret)
+			goto out_teardown_irq;
+
+		/* Disable learning */
+		ret = rtl8365mb_port_set_learning(smi, i, false);
+		if (ret)
+			goto out_teardown_irq;
+
+		/* Set the initial STP state of all ports to DISABLED, otherwise
+		 * ports will still forward frames to the CPU despite being
+		 * administratively down by default.
+		 */
+		rtl8365mb_port_stp_state_set(smi->ds, i, BR_STATE_DISABLED);
+	}
+
+	/* Set maximum packet length to 1536 bytes */
+	ret = regmap_update_bits(smi->map, RTL8365MB_CFG0_MAX_LEN_REG,
+				 RTL8365MB_CFG0_MAX_LEN_MASK,
+				 FIELD_PREP(RTL8365MB_CFG0_MAX_LEN_MASK, 1536));
+	if (ret)
+		goto out_teardown_irq;
+
+	ret = realtek_smi_setup_mdio(smi);
+	if (ret) {
+		dev_err(smi->dev, "could not set up MDIO bus\n");
+		goto out_teardown_irq;
+	}
+
+	/* Start statistics counter polling */
+	rtl8365mb_stats_setup(smi);
+
+	return 0;
+
+out_teardown_irq:
+	rtl8365mb_irq_teardown(smi);
+
+out_error:
+	return ret;
+}
+
+static void rtl8365mb_teardown(struct dsa_switch *ds)
+{
+	struct realtek_smi *smi = ds->priv;
+
+	rtl8365mb_stats_teardown(smi);
+	rtl8365mb_irq_teardown(smi);
+}
+
+static int rtl8365mb_get_chip_id_and_ver(struct regmap *map, u32 *id, u32 *ver)
+{
+	int ret;
+
+	/* For some reason we have to write a magic value to an arbitrary
+	 * register whenever accessing the chip ID/version registers.
+	 */
+	ret = regmap_write(map, RTL8365MB_MAGIC_REG, RTL8365MB_MAGIC_VALUE);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(map, RTL8365MB_CHIP_ID_REG, id);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(map, RTL8365MB_CHIP_VER_REG, ver);
+	if (ret)
+		return ret;
+
+	/* Reset magic register */
+	ret = regmap_write(map, RTL8365MB_MAGIC_REG, 0);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int rtl8365mb_detect(struct realtek_smi *smi)
+{
+	struct rtl8365mb *mb = smi->chip_data;
+	u32 chip_id;
+	u32 chip_ver;
+	int ret;
+
+	ret = rtl8365mb_get_chip_id_and_ver(smi->map, &chip_id, &chip_ver);
+	if (ret) {
+		dev_err(smi->dev, "failed to read chip id and version: %d\n",
+			ret);
+		return ret;
+	}
+
+	switch (chip_id) {
+	case RTL8365MB_CHIP_ID_8365MB_VC:
+		dev_info(smi->dev,
+			 "found an RTL8365MB-VC switch (ver=0x%04x)\n",
+			 chip_ver);
+
+		smi->cpu_port = RTL8365MB_CPU_PORT_NUM_8365MB_VC;
+		smi->num_ports = smi->cpu_port + 1;
+
+		mb->smi = smi;
+		mb->chip_id = chip_id;
+		mb->chip_ver = chip_ver;
+		mb->port_mask = BIT(smi->num_ports) - 1;
+		mb->learn_limit_max = RTL8365MB_LEARN_LIMIT_MAX_8365MB_VC;
+		mb->jam_table = rtl8365mb_init_jam_8365mb_vc;
+		mb->jam_size = ARRAY_SIZE(rtl8365mb_init_jam_8365mb_vc);
+
+		mb->cpu.enable = 1;
+		mb->cpu.mask = BIT(smi->cpu_port);
+		mb->cpu.trap_port = smi->cpu_port;
+		mb->cpu.insert = RTL8365MB_CPU_INSERT_TO_ALL;
+		mb->cpu.position = RTL8365MB_CPU_POS_AFTER_SA;
+		mb->cpu.rx_length = RTL8365MB_CPU_RXLEN_64BYTES;
+		mb->cpu.format = RTL8365MB_CPU_FORMAT_8BYTES;
+
+		break;
+	default:
+		dev_err(smi->dev,
+			"found an unknown Realtek switch (id=0x%04x, ver=0x%04x)\n",
+			chip_id, chip_ver);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static const struct dsa_switch_ops rtl8365mb_switch_ops = {
+	.get_tag_protocol = rtl8365mb_get_tag_protocol,
+	.setup = rtl8365mb_setup,
+	.teardown = rtl8365mb_teardown,
+	.phylink_validate = rtl8365mb_phylink_validate,
+	.phylink_mac_config = rtl8365mb_phylink_mac_config,
+	.phylink_mac_link_down = rtl8365mb_phylink_mac_link_down,
+	.phylink_mac_link_up = rtl8365mb_phylink_mac_link_up,
+	.port_stp_state_set = rtl8365mb_port_stp_state_set,
+	.get_strings = rtl8365mb_get_strings,
+	.get_ethtool_stats = rtl8365mb_get_ethtool_stats,
+	.get_sset_count = rtl8365mb_get_sset_count,
+	.get_eth_phy_stats = rtl8365mb_get_phy_stats,
+	.get_eth_mac_stats = rtl8365mb_get_mac_stats,
+	.get_eth_ctrl_stats = rtl8365mb_get_ctrl_stats,
+	.get_stats64 = rtl8365mb_get_stats64,
+};
+
+static const struct realtek_smi_ops rtl8365mb_smi_ops = {
+	.detect = rtl8365mb_detect,
+	.phy_read = rtl8365mb_phy_read,
+	.phy_write = rtl8365mb_phy_write,
+};
+
+const struct realtek_smi_variant rtl8365mb_variant = {
+	.ds_ops = &rtl8365mb_switch_ops,
+	.ops = &rtl8365mb_smi_ops,
+	.clk_delay = 10,
+	.cmd_read = 0xb9,
+	.cmd_write = 0xb8,
+	.chip_data_sz = sizeof(struct rtl8365mb),
+};
+EXPORT_SYMBOL_GPL(rtl8365mb_variant);

drivers/net/phy/realtek.c

···
 		.resume		= genphy_resume,
 		.read_page	= rtl821x_read_page,
 		.write_page	= rtl821x_write_page,
+	}, {
+		PHY_ID_MATCH_EXACT(0x001cc942),
+		.name		= "RTL8365MB-VC Gigabit Ethernet",
+		/* Interrupt handling analogous to RTL8366RB */
+		.config_intr	= genphy_no_config_intr,
+		.handle_interrupt = genphy_handle_interrupt_no_ack,
+		.suspend	= genphy_suspend,
+		.resume		= genphy_resume,
 	},
 };
 

include/net/dsa.h

···
 #define DSA_TAG_PROTO_SEVILLE_VALUE		21
 #define DSA_TAG_PROTO_BRCM_LEGACY_VALUE		22
 #define DSA_TAG_PROTO_SJA1110_VALUE		23
+#define DSA_TAG_PROTO_RTL8_4_VALUE		24
 
 enum dsa_tag_protocol {
 	DSA_TAG_PROTO_NONE		= DSA_TAG_PROTO_NONE_VALUE,
···
 	DSA_TAG_PROTO_OCELOT_8021Q	= DSA_TAG_PROTO_OCELOT_8021Q_VALUE,
 	DSA_TAG_PROTO_SEVILLE		= DSA_TAG_PROTO_SEVILLE_VALUE,
 	DSA_TAG_PROTO_SJA1110		= DSA_TAG_PROTO_SJA1110_VALUE,
+	DSA_TAG_PROTO_RTL8_4		= DSA_TAG_PROTO_RTL8_4_VALUE,
 };
 
 struct dsa_switch;
···
 	int	(*get_sset_count)(struct dsa_switch *ds, int port, int sset);
 	void	(*get_ethtool_phy_stats)(struct dsa_switch *ds,
 					 int port, uint64_t *data);
+	void	(*get_eth_phy_stats)(struct dsa_switch *ds, int port,
+				     struct ethtool_eth_phy_stats *phy_stats);
+	void	(*get_eth_mac_stats)(struct dsa_switch *ds, int port,
+				     struct ethtool_eth_mac_stats *mac_stats);
+	void	(*get_eth_ctrl_stats)(struct dsa_switch *ds, int port,
+				      struct ethtool_eth_ctrl_stats *ctrl_stats);
 	void	(*get_stats64)(struct dsa_switch *ds, int port,
 				   struct rtnl_link_stats64 *s);
 	void	(*self_test)(struct dsa_switch *ds, int port,

include/uapi/linux/if_ether.h

···
 					 * over Ethernet
 					 */
 #define ETH_P_PAE	0x888E		/* Port Access Entity (IEEE 802.1X) */
+#define ETH_P_REALTEK	0x8899          /* Multiple proprietary protocols */
 #define ETH_P_AOE	0x88A2		/* ATA over Ethernet		*/
 #define ETH_P_8021AD	0x88A8          /* 802.1ad Service VLAN		*/
 #define ETH_P_802_EX1	0x88B5		/* 802.1 Local Experimental 1.  */

net/dsa/Kconfig

···
 	  Say Y if you want to enable support for tagging frames for the
 	  Microchip 8795/9477/9893 families of switches.
 
-config NET_DSA_TAG_RTL4_A
-	tristate "Tag driver for Realtek 4 byte protocol A tags"
-	help
-	  Say Y or M if you want to enable support for tagging frames for the
-	  Realtek switches with 4 byte protocol A tags, sich as found in
-	  the Realtek RTL8366RB.
-
 config NET_DSA_TAG_OCELOT
 	tristate "Tag driver for Ocelot family of switches, using NPI port"
 	select PACKING
···
 	help
 	  Say Y or M if you want to enable support for tagging frames for
 	  the Qualcomm Atheros QCA8K switches.
+
+config NET_DSA_TAG_RTL4_A
+	tristate "Tag driver for Realtek 4 byte protocol A tags"
+	help
+	  Say Y or M if you want to enable support for tagging frames for the
+	  Realtek switches with 4 byte protocol A tags, sich as found in
+	  the Realtek RTL8366RB.
+
+config NET_DSA_TAG_RTL8_4
+	tristate "Tag driver for Realtek 8 byte protocol 4 tags"
+	help
+	  Say Y or M if you want to enable support for tagging frames for Realtek
+	  switches with 8 byte protocol 4 tags, such as the Realtek RTL8365MB-VC.
 
 config NET_DSA_TAG_LAN9303
 	tristate "Tag driver for SMSC/Microchip LAN9303 family of switches"

net/dsa/Makefile

···
 obj-$(CONFIG_NET_DSA_TAG_GSWIP) += tag_gswip.o
 obj-$(CONFIG_NET_DSA_TAG_HELLCREEK) += tag_hellcreek.o
 obj-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o
-obj-$(CONFIG_NET_DSA_TAG_RTL4_A) += tag_rtl4_a.o
 obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
 obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
 obj-$(CONFIG_NET_DSA_TAG_OCELOT) += tag_ocelot.o
 obj-$(CONFIG_NET_DSA_TAG_OCELOT_8021Q) += tag_ocelot_8021q.o
 obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
+obj-$(CONFIG_NET_DSA_TAG_RTL4_A) += tag_rtl4_a.o
+obj-$(CONFIG_NET_DSA_TAG_RTL8_4) += tag_rtl8_4.o
 obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o
 obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
 obj-$(CONFIG_NET_DSA_TAG_XRS700X) += tag_xrs700x.o

net/dsa/slave.c

···
 	return -EOPNOTSUPP;
 }
 
+static void dsa_slave_get_eth_phy_stats(struct net_device *dev,
+					struct ethtool_eth_phy_stats *phy_stats)
+{
+	struct dsa_port *dp = dsa_slave_to_port(dev);
+	struct dsa_switch *ds = dp->ds;
+
+	if (ds->ops->get_eth_phy_stats)
+		ds->ops->get_eth_phy_stats(ds, dp->index, phy_stats);
+}
+
+static void dsa_slave_get_eth_mac_stats(struct net_device *dev,
+					struct ethtool_eth_mac_stats *mac_stats)
+{
+	struct dsa_port *dp = dsa_slave_to_port(dev);
+	struct dsa_switch *ds = dp->ds;
+
+	if (ds->ops->get_eth_mac_stats)
+		ds->ops->get_eth_mac_stats(ds, dp->index, mac_stats);
+}
+
+static void
+dsa_slave_get_eth_ctrl_stats(struct net_device *dev,
+			     struct ethtool_eth_ctrl_stats *ctrl_stats)
+{
+	struct dsa_port *dp = dsa_slave_to_port(dev);
+	struct dsa_switch *ds = dp->ds;
+
+	if (ds->ops->get_eth_ctrl_stats)
+		ds->ops->get_eth_ctrl_stats(ds, dp->index, ctrl_stats);
+}
+
 static void dsa_slave_net_selftest(struct net_device *ndev,
 				   struct ethtool_test *etest, u64 *buf)
 {
···
 	.get_strings		= dsa_slave_get_strings,
 	.get_ethtool_stats	= dsa_slave_get_ethtool_stats,
 	.get_sset_count		= dsa_slave_get_sset_count,
+	.get_eth_phy_stats	= dsa_slave_get_eth_phy_stats,
+	.get_eth_mac_stats	= dsa_slave_get_eth_mac_stats,
+	.get_eth_ctrl_stats	= dsa_slave_get_eth_ctrl_stats,
 	.set_wol		= dsa_slave_set_wol,
 	.get_wol		= dsa_slave_get_wol,
 	.set_eee		= dsa_slave_set_eee,

net/dsa/tag_rtl8_4.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Handler for Realtek 8 byte switch tags
+ *
+ * Copyright (C) 2021 Alvin Šipraga <[e-mail]>
+ *
+ * NOTE: Currently only supports protocol "4" found in the RTL8365MB, hence
+ * named tag_rtl8_4.
+ *
+ * This tag header has the following format:
+ *
+ *  -------------------------------------------
+ *  | MAC DA | MAC SA | 8 byte tag | Type | ...
+ *  -------------------------------------------
+ *     _______________/            \______________________________________
+ *    /                                                                   \
+ *  0                                  7|8                                 15
+ *  |-----------------------------------+-----------------------------------|---
+ *  |                               (16-bit)                                | ^
+ *  |                       Realtek EtherType [0x8899]                      | |
+ *  |-----------------------------------+-----------------------------------| 8
+ *  |              (8-bit)              |              (8-bit)              |
+ *  |          Protocol [0x04]          |              REASON               | b
+ *  |-----------------------------------+-----------------------------------| y
+ *  |   (1)  | (1) | (2) |   (1)  | (3) | (1)  | (1) |    (1)    |   (5)    | t
+ *  | FID_EN |  X  | FID | PRI_EN | PRI | KEEP |  X  | LEARN_DIS |    X     | e
+ *  |-----------------------------------+-----------------------------------| s
+ *  |   (1)  |                       (15-bit)                               | |
+ *  |  ALLOW |                        TX/RX                                 | v
+ *  |-----------------------------------+-----------------------------------|---
+ *
+ * With the following field descriptions:
+ *
+ *    field      | description
+ *   ------------+-------------
+ *    Realtek    | 0x8899: indicates that this is a proprietary Realtek tag;
+ *     EtherType |         note that Realtek uses the same EtherType for
+ *               |         other incompatible tag formats (e.g. tag_rtl4_a.c)
+ *    Protocol   | 0x04: indicates that this tag conforms to this format
+ *    X          | reserved
+ *   ------------+-------------
+ *    REASON     | reason for forwarding packet to CPU
+ *               | 0: packet was forwarded or flooded to CPU
+ *               | 80: packet was trapped to CPU
+ *    FID_EN     | 1: packet has an FID
+ *               | 0: no FID
+ *    FID        | FID of packet (if FID_EN=1)
+ *    PRI_EN     | 1: force priority of packet
+ *               | 0: don't force priority
+ *    PRI        | priority of packet (if PRI_EN=1)
+ *    KEEP       | preserve packet VLAN tag format
+ *    LEARN_DIS  | don't learn the source MAC address of the packet
+ *    ALLOW      | 1: treat TX/RX field as an allowance port mask, meaning the
+ *               |    packet may only be forwarded to ports specified in the
+ *               |    mask
+ *               | 0: no allowance port mask, TX/RX field is the forwarding
+ *               |    port mask
+ *    TX/RX      | TX (switch->CPU): port number the packet was received on
+ *               | RX (CPU->switch): forwarding port mask (if ALLOW=0)
+ *               |                   allowance port mask (if ALLOW=1)
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/etherdevice.h>
+
+#include "dsa_priv.h"
+
+/* Protocols supported:
+ *
+ * 0x04 = RTL8365MB DSA protocol
+ */
+
+#define RTL8_4_TAG_LEN			8
+
+#define RTL8_4_PROTOCOL			GENMASK(15, 8)
+#define   RTL8_4_PROTOCOL_RTL8365MB	0x04
+#define RTL8_4_REASON			GENMASK(7, 0)
+#define   RTL8_4_REASON_FORWARD		0
+#define   RTL8_4_REASON_TRAP		80
+
+#define RTL8_4_LEARN_DIS		BIT(5)
+
+#define RTL8_4_TX			GENMASK(3, 0)
+#define RTL8_4_RX			GENMASK(10, 0)
+
+static struct sk_buff *rtl8_4_tag_xmit(struct sk_buff *skb,
+				       struct net_device *dev)
+{
+	struct dsa_port *dp = dsa_slave_to_port(dev);
+	__be16 *tag;
+
+	skb_push(skb, RTL8_4_TAG_LEN);
+
+	dsa_alloc_etype_header(skb, RTL8_4_TAG_LEN);
+	tag = dsa_etype_header_pos_tx(skb);
+
+	/* Set Realtek EtherType */
+	tag[0] = htons(ETH_P_REALTEK);
+
+	/* Set Protocol; zero REASON */
+	tag[1] = htons(FIELD_PREP(RTL8_4_PROTOCOL, RTL8_4_PROTOCOL_RTL8365MB));
+
+	/* Zero FID_EN, FID, PRI_EN, PRI, KEEP; set LEARN_DIS */
+	tag[2] = htons(FIELD_PREP(RTL8_4_LEARN_DIS, 1));
+
+	/* Zero ALLOW; set RX (CPU->switch) forwarding port mask */
+	tag[3] = htons(FIELD_PREP(RTL8_4_RX, BIT(dp->index)));
+
+	return skb;
+}
+
+static struct sk_buff *rtl8_4_tag_rcv(struct sk_buff *skb,
+				      struct net_device *dev)
+{
+	__be16 *tag;
+	u16 etype;
+	u8 reason;
+	u8 proto;
+	u8 port;
+
+	if (unlikely(!pskb_may_pull(skb, RTL8_4_TAG_LEN)))
+		return NULL;
+
+	tag = dsa_etype_header_pos_rx(skb);
+
+	/* Parse Realtek EtherType */
+	etype = ntohs(tag[0]);
+	if (unlikely(etype != ETH_P_REALTEK)) {
+		dev_warn_ratelimited(&dev->dev,
+				     "non-realtek ethertype 0x%04x\n", etype);
+		return NULL;
+	}
+
+	/* Parse Protocol */
+	proto = FIELD_GET(RTL8_4_PROTOCOL, ntohs(tag[1]));
+	if (unlikely(proto != RTL8_4_PROTOCOL_RTL8365MB)) {
+		dev_warn_ratelimited(&dev->dev,
+				     "unknown realtek protocol 0x%02x\n",
+				     proto);
+		return NULL;
+	}
+
+	/* Parse REASON */
+	reason = FIELD_GET(RTL8_4_REASON, ntohs(tag[1]));
+
+	/* Parse TX (switch->CPU) */
+	port = FIELD_GET(RTL8_4_TX, ntohs(tag[3]));
+	skb->dev = dsa_master_find_slave(dev, 0, port);
+	if (!skb->dev) {
+		dev_warn_ratelimited(&dev->dev,
+				     "could not find slave for port %d\n",
+				     port);
+		return NULL;
+	}
+
+	/* Remove tag and recalculate checksum */
+	skb_pull_rcsum(skb, RTL8_4_TAG_LEN);
+
+	dsa_strip_etype_header(skb, RTL8_4_TAG_LEN);
+
+	if (reason != RTL8_4_REASON_TRAP)
+		dsa_default_offload_fwd_mark(skb);
+
+	return skb;
+}
+
+static const struct dsa_device_ops rtl8_4_netdev_ops = {
+	.name = "rtl8_4",
+	.proto = DSA_TAG_PROTO_RTL8_4,
+	.xmit = rtl8_4_tag_xmit,
+	.rcv = rtl8_4_tag_rcv,
+	.needed_headroom = RTL8_4_TAG_LEN,
+};
+module_dsa_tag_driver(rtl8_4_netdev_ops);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_RTL8_4);