Message-ID: <20240515060320.2783244-4-danishanwar@ti.com>
Date: Wed, 15 May 2024 11:33:20 +0530
From: MD Danish Anwar <danishanwar@...com>
To: Dan Carpenter <dan.carpenter@...aro.org>,
        Jan Kiszka
	<jan.kiszka@...mens.com>, Andrew Lunn <andrew@...n.ch>,
        Simon Horman
	<horms@...nel.org>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        Wolfram Sang
	<wsa+renesas@...g-engineering.com>,
        Arnd Bergmann <arnd@...db.de>, Diogo Ivo
	<diogo.ivo@...mens.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Roger
 Quadros <rogerq@...nel.org>,
        MD Danish Anwar <danishanwar@...com>, Paolo
 Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>, Eric Dumazet
	<edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
CC: <linux-arm-kernel@...ts.infradead.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <srk@...com>,
        Vignesh Raghavendra
	<vigneshr@...com>, <r-gunasekaran@...com>
Subject: [RFC PATCH net-next v4 3/3] net: ti: icssg-prueth: Add support for ICSSG switch firmware

Add support for ICSSG switch firmware using existing Dual EMAC driver
with switchdev.

Limitations:
VLAN offloading is limited to 0-256 IDs.
MDB/FDB static entries are limited to 511 entries and different FDBs can
hash to same bucket and thus may not completely offloaded

Example assuming ETH1 and ETH2 as ICSSG2 interfaces:

Switch to ICSSG Switch mode:
 ip link add name br0 type bridge
 ip link set dev eth1 master br0
 ip link set dev eth2 master br0
 ip link set dev br0 up
 bridge vlan add dev br0 vid 1 pvid untagged self

Going back to Dual EMAC mode:

 ip link set dev br0 down
 ip link set dev eth1 nomaster
 ip link set dev eth2 nomaster
 ip link del name br0 type bridge

By default, Dual EMAC firmware is loaded, and can be changed to switch
mode by above steps

Signed-off-by: MD Danish Anwar <danishanwar@...com>
---
NOTE: The second interface can be added before / after the bridge is up
      and still forwarding would work. Similarly the second interface can
      be removed before / after bringing the bridge down and driver will
      transition back into dual emac mode.

      As we are not restarting the interfaces, the DRAM, SMEM and MSMC RAM
      doesn't get cleared. As a result with this approach all
      configurations will be saved.

 drivers/net/ethernet/ti/Kconfig              |   1 +
 drivers/net/ethernet/ti/Makefile             |   3 +-
 drivers/net/ethernet/ti/icssg/icssg_common.c |   2 +
 drivers/net/ethernet/ti/icssg/icssg_config.c | 136 ++++++++++-
 drivers/net/ethernet/ti/icssg/icssg_config.h |   7 +
 drivers/net/ethernet/ti/icssg/icssg_prueth.c | 238 ++++++++++++++++++-
 6 files changed, 372 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/ti/Kconfig b/drivers/net/ethernet/ti/Kconfig
index 1729eb0e0b41..f160a3b71499 100644
--- a/drivers/net/ethernet/ti/Kconfig
+++ b/drivers/net/ethernet/ti/Kconfig
@@ -204,6 +204,7 @@ config TI_ICSSG_PRUETH_SR1
 	select TI_ICSS_IEP
 	select TI_K3_CPPI_DESC_POOL
 	depends on PRU_REMOTEPROC
+	depends on NET_SWITCHDEV
 	depends on ARCH_K3 && OF && TI_K3_UDMA_GLUE_LAYER
 	help
 	  Support dual Gigabit Ethernet ports over the ICSSG PRU Subsystem.
diff --git a/drivers/net/ethernet/ti/Makefile b/drivers/net/ethernet/ti/Makefile
index 6e086b4c0384..59cd20a38267 100644
--- a/drivers/net/ethernet/ti/Makefile
+++ b/drivers/net/ethernet/ti/Makefile
@@ -39,7 +39,8 @@ icssg-prueth-y := icssg/icssg_prueth.o \
 		  icssg/icssg_config.o \
 		  icssg/icssg_mii_cfg.o \
 		  icssg/icssg_stats.o \
-		  icssg/icssg_ethtool.o
+		  icssg/icssg_ethtool.o \
+		  icssg/icssg_switchdev.o
 obj-$(CONFIG_TI_ICSSG_PRUETH_SR1) += icssg-prueth-sr1.o
 icssg-prueth-sr1-y := icssg/icssg_prueth_sr1.o \
 		      icssg/icssg_common.o \
diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c
index 1d62c05b5f7c..1044a814b2ad 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_common.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_common.c
@@ -557,6 +557,8 @@ static int emac_rx_packet(struct prueth_emac *emac, u32 flow_id)
 	} else {
 		/* send the filled skb up the n/w stack */
 		skb_put(skb, pkt_len);
+		if (emac->prueth->is_switch_mode)
+			skb->offload_fwd_mark = emac->offload_fwd_mark;
 		skb->protocol = eth_type_trans(skb, ndev);
 		napi_gro_receive(&emac->napi_rx, skb);
 		ndev->stats.rx_bytes += pkt_len;
diff --git a/drivers/net/ethernet/ti/icssg/icssg_config.c b/drivers/net/ethernet/ti/icssg/icssg_config.c
index 2213374d4d45..328b6564091f 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_config.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_config.c
@@ -107,28 +107,49 @@ static const struct map hwq_map[2][ICSSG_NUM_OTHER_QUEUES] = {
 	},
 };
 
+static void icssg_config_mii_init_switch(struct prueth_emac *emac)
+{
+	struct prueth *prueth = emac->prueth;
+	int mii = prueth_emac_slice(emac);
+	u32 txcfg_reg, pcnt_reg, txcfg;
+	struct regmap *mii_rt;
+
+	mii_rt = prueth->mii_rt;
+
+	txcfg_reg = (mii == ICSS_MII0) ? PRUSS_MII_RT_TXCFG0 :
+				       PRUSS_MII_RT_TXCFG1;
+	pcnt_reg = (mii == ICSS_MII0) ? PRUSS_MII_RT_RX_PCNT0 :
+				       PRUSS_MII_RT_RX_PCNT1;
+
+	txcfg = PRUSS_MII_RT_TXCFG_TX_ENABLE |
+		PRUSS_MII_RT_TXCFG_TX_AUTO_PREAMBLE |
+		PRUSS_MII_RT_TXCFG_TX_IPG_WIRE_CLK_EN;
+
+	if (emac->phy_if == PHY_INTERFACE_MODE_MII && mii == ICSS_MII1)
+		txcfg |= PRUSS_MII_RT_TXCFG_TX_MUX_SEL;
+	else if (emac->phy_if != PHY_INTERFACE_MODE_MII && mii == ICSS_MII0)
+		txcfg |= PRUSS_MII_RT_TXCFG_TX_MUX_SEL;
+
+	regmap_write(mii_rt, txcfg_reg, txcfg);
+	regmap_write(mii_rt, pcnt_reg, 0x1);
+}
+
 static void icssg_config_mii_init(struct prueth_emac *emac)
 {
-	u32 rxcfg, txcfg, rxcfg_reg, txcfg_reg, pcnt_reg;
 	struct prueth *prueth = emac->prueth;
 	int slice = prueth_emac_slice(emac);
+	u32 txcfg, txcfg_reg, pcnt_reg;
 	struct regmap *mii_rt;
 
 	mii_rt = prueth->mii_rt;
 
-	rxcfg_reg = (slice == ICSS_MII0) ? PRUSS_MII_RT_RXCFG0 :
-				       PRUSS_MII_RT_RXCFG1;
 	txcfg_reg = (slice == ICSS_MII0) ? PRUSS_MII_RT_TXCFG0 :
 				       PRUSS_MII_RT_TXCFG1;
 	pcnt_reg = (slice == ICSS_MII0) ? PRUSS_MII_RT_RX_PCNT0 :
 				       PRUSS_MII_RT_RX_PCNT1;
 
-	rxcfg = MII_RXCFG_DEFAULT;
 	txcfg = MII_TXCFG_DEFAULT;
 
-	if (slice == ICSS_MII1)
-		rxcfg |= PRUSS_MII_RT_RXCFG_RX_MUX_SEL;
-
 	/* In MII mode TX lines swapped inside ICSSG, so TX_MUX_SEL cfg need
 	 * to be swapped also comparing to RGMII mode.
 	 */
@@ -137,7 +158,6 @@ static void icssg_config_mii_init(struct prueth_emac *emac)
 	else if (emac->phy_if != PHY_INTERFACE_MODE_MII && slice == ICSS_MII1)
 		txcfg |= PRUSS_MII_RT_TXCFG_TX_MUX_SEL;
 
-	regmap_write(mii_rt, rxcfg_reg, rxcfg);
 	regmap_write(mii_rt, txcfg_reg, txcfg);
 	regmap_write(mii_rt, pcnt_reg, 0x1);
 }
@@ -257,6 +277,66 @@ static int emac_r30_is_done(struct prueth_emac *emac)
 	return 1;
 }
 
+static int prueth_switch_buffer_setup(struct prueth_emac *emac)
+{
+	struct icssg_buffer_pool_cfg __iomem *bpool_cfg;
+	struct icssg_rxq_ctx __iomem *rxq_ctx;
+	struct prueth *prueth = emac->prueth;
+	int slice = prueth_emac_slice(emac);
+	u32 addr;
+	int i;
+
+	addr = lower_32_bits(prueth->msmcram.pa);
+	if (slice)
+		addr += PRUETH_NUM_BUF_POOLS * PRUETH_EMAC_BUF_POOL_SIZE;
+
+	if (addr % SZ_64K) {
+		dev_warn(prueth->dev, "buffer pool needs to be 64KB aligned\n");
+		return -EINVAL;
+	}
+
+	bpool_cfg = emac->dram.va + BUFFER_POOL_0_ADDR_OFFSET;
+	/* workaround for f/w bug. bpool 0 needs to be initilalized */
+	for (i = 0; i <  PRUETH_NUM_BUF_POOLS; i++) {
+		writel(addr, &bpool_cfg[i].addr);
+		writel(PRUETH_EMAC_BUF_POOL_SIZE, &bpool_cfg[i].len);
+		addr += PRUETH_EMAC_BUF_POOL_SIZE;
+	}
+
+	if (!slice)
+		addr += PRUETH_NUM_BUF_POOLS * PRUETH_EMAC_BUF_POOL_SIZE;
+	else
+		addr += PRUETH_SW_NUM_BUF_POOLS_HOST * PRUETH_SW_BUF_POOL_SIZE_HOST;
+
+	for (i = PRUETH_NUM_BUF_POOLS;
+	     i < 2 * PRUETH_SW_NUM_BUF_POOLS_HOST + PRUETH_NUM_BUF_POOLS;
+	     i++) {
+		/* The driver only uses first 4 queues per PRU so only initialize them */
+		if (i % PRUETH_SW_NUM_BUF_POOLS_HOST < PRUETH_SW_NUM_BUF_POOLS_PER_PRU) {
+			writel(addr, &bpool_cfg[i].addr);
+			writel(PRUETH_SW_BUF_POOL_SIZE_HOST, &bpool_cfg[i].len);
+			addr += PRUETH_SW_BUF_POOL_SIZE_HOST;
+		} else {
+			writel(0, &bpool_cfg[i].addr);
+			writel(0, &bpool_cfg[i].len);
+		}
+	}
+
+	if (!slice)
+		addr += PRUETH_SW_NUM_BUF_POOLS_HOST * PRUETH_SW_BUF_POOL_SIZE_HOST;
+	else
+		addr += PRUETH_EMAC_RX_CTX_BUF_SIZE;
+
+	rxq_ctx = emac->dram.va + HOST_RX_Q_PRE_CONTEXT_OFFSET;
+	for (i = 0; i < 3; i++)
+		writel(addr, &rxq_ctx->start[i]);
+
+	addr += PRUETH_EMAC_RX_CTX_BUF_SIZE;
+	writel(addr - SZ_2K, &rxq_ctx->end);
+
+	return 0;
+}
+
 static int prueth_emac_buffer_setup(struct prueth_emac *emac)
 {
 	struct icssg_buffer_pool_cfg __iomem *bpool_cfg;
@@ -333,13 +413,41 @@ static void icssg_init_emac_mode(struct prueth *prueth)
 	icssg_class_set_host_mac_addr(prueth->miig_rt, mac);
 }
 
+static void icssg_init_switch_mode(struct prueth *prueth)
+{
+	u32 addr = prueth->shram.pa + EMAC_ICSSG_SWITCH_DEFAULT_VLAN_TABLE_OFFSET;
+	int i;
+
+	if (prueth->emacs_initialized)
+		return;
+
+	/* Set VLAN TABLE address base */
+	regmap_update_bits(prueth->miig_rt, FDB_GEN_CFG1, SMEM_VLAN_OFFSET_MASK,
+			   addr <<  SMEM_VLAN_OFFSET);
+	/* Set enable VLAN aware mode, and FDBs for all PRUs */
+	regmap_write(prueth->miig_rt, FDB_GEN_CFG2, FDB_EN_ALL);
+	prueth->vlan_tbl = (struct prueth_vlan_tbl __force *)(prueth->shram.va +
+			    EMAC_ICSSG_SWITCH_DEFAULT_VLAN_TABLE_OFFSET);
+	for (i = 0; i < SZ_4K - 1; i++) {
+		prueth->vlan_tbl[i].fid = i;
+		prueth->vlan_tbl[i].fid_c1 = 0;
+	}
+
+	if (prueth->hw_bridge_dev)
+		icssg_class_set_host_mac_addr(prueth->miig_rt, prueth->hw_bridge_dev->dev_addr);
+	icssg_set_pvid(prueth, prueth->default_vlan, PRUETH_PORT_HOST);
+}
+
 int icssg_config(struct prueth *prueth, struct prueth_emac *emac, int slice)
 {
 	void __iomem *config = emac->dram.va + ICSSG_CONFIG_OFFSET;
 	struct icssg_flow_cfg __iomem *flow_cfg;
 	int ret;
 
-	icssg_init_emac_mode(prueth);
+	if (prueth->is_switch_mode)
+		icssg_init_switch_mode(prueth);
+	else
+		icssg_init_emac_mode(prueth);
 
 	memset_io(config, 0, TAS_GATE_MASK_LIST0);
 	icssg_miig_queues_init(prueth, slice);
@@ -353,7 +461,10 @@ int icssg_config(struct prueth *prueth, struct prueth_emac *emac, int slice)
 	regmap_update_bits(prueth->miig_rt, ICSSG_CFG_OFFSET,
 			   ICSSG_CFG_DEFAULT, ICSSG_CFG_DEFAULT);
 	icssg_miig_set_interface_mode(prueth->miig_rt, slice, emac->phy_if);
-	icssg_config_mii_init(emac);
+	if (prueth->is_switch_mode)
+		icssg_config_mii_init_switch(emac);
+	else
+		icssg_config_mii_init(emac);
 	icssg_config_ipg(emac);
 	icssg_update_rgmii_cfg(prueth->miig_rt, emac);
 
@@ -376,7 +487,10 @@ int icssg_config(struct prueth *prueth, struct prueth_emac *emac, int slice)
 	writeb(0, config + SPL_PKT_DEFAULT_PRIORITY);
 	writeb(0, config + QUEUE_NUM_UNTAGGED);
 
-	ret = prueth_emac_buffer_setup(emac);
+	if (prueth->is_switch_mode)
+		ret = prueth_switch_buffer_setup(emac);
+	else
+		ret = prueth_emac_buffer_setup(emac);
 	if (ret)
 		return ret;
 
diff --git a/drivers/net/ethernet/ti/icssg/icssg_config.h b/drivers/net/ethernet/ti/icssg/icssg_config.h
index 9d8558bd0f15..57206662d5c5 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_config.h
+++ b/drivers/net/ethernet/ti/icssg/icssg_config.h
@@ -35,6 +35,13 @@ struct icssg_flow_cfg {
 	(2 * (PRUETH_EMAC_BUF_POOL_SIZE * PRUETH_NUM_BUF_POOLS + \
 	 PRUETH_EMAC_RX_CTX_BUF_SIZE * 2))
 
+#define PRUETH_SW_BUF_POOL_SIZE_HOST	SZ_4K
+#define PRUETH_SW_NUM_BUF_POOLS_HOST	8
+#define PRUETH_SW_NUM_BUF_POOLS_PER_PRU 4
+#define MSMC_RAM_SIZE_SWITCH_MODE \
+	(MSMC_RAM_SIZE + \
+	(2 * PRUETH_SW_BUF_POOL_SIZE_HOST * PRUETH_SW_NUM_BUF_POOLS_HOST))
+
 #define PRUETH_SWITCH_FDB_MASK ((SIZE_OF_FDB / NUMBER_OF_FDB_BUCKET_ENTRIES) - 1)
 
 struct icssg_rxq_ctx {
diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
index 7ece91b75aeb..92e30dba09c4 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
@@ -27,6 +27,7 @@
 #include <linux/remoteproc/pruss.h>
 #include <linux/regmap.h>
 #include <linux/remoteproc.h>
+#include <net/switchdev.h>
 
 #include "icssg_prueth.h"
 #include "icssg_mii_rt.h"
@@ -35,6 +36,10 @@
 
 #define PRUETH_MODULE_DESCRIPTION "PRUSS ICSSG Ethernet driver"
 
+#define DEFAULT_VID		1
+#define DEFAULT_PORT_MASK	1
+#define DEFAULT_UNTAG_MASK	1
+
 /* CTRLMMR_ICSSG_RGMII_CTRL register bits */
 #define ICSSG_CTRL_RGMII_ID_MODE                BIT(24)
 
@@ -113,6 +118,19 @@ static irqreturn_t prueth_tx_ts_irq(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static struct icssg_firmwares icssg_switch_firmwares[] = {
+	{
+		.pru = "ti-pruss/am65x-sr2-pru0-prusw-fw.elf",
+		.rtu = "ti-pruss/am65x-sr2-rtu0-prusw-fw.elf",
+		.txpru = "ti-pruss/am65x-sr2-txpru0-prusw-fw.elf",
+	},
+	{
+		.pru = "ti-pruss/am65x-sr2-pru1-prusw-fw.elf",
+		.rtu = "ti-pruss/am65x-sr2-rtu1-prusw-fw.elf",
+		.txpru = "ti-pruss/am65x-sr2-txpru1-prusw-fw.elf",
+	}
+};
+
 static struct icssg_firmwares icssg_emac_firmwares[] = {
 	{
 		.pru = "ti-pruss/am65x-sr2-pru0-prueth-fw.elf",
@@ -132,7 +150,10 @@ static int prueth_emac_start(struct prueth *prueth, struct prueth_emac *emac)
 	struct device *dev = prueth->dev;
 	int slice, ret;
 
-	firmwares = icssg_emac_firmwares;
+	if (prueth->is_switch_mode)
+		firmwares = icssg_switch_firmwares;
+	else
+		firmwares = icssg_emac_firmwares;
 
 	slice = prueth_emac_slice(emac);
 	if (slice < 0) {
@@ -436,9 +457,8 @@ static int emac_ndo_open(struct net_device *ndev)
 	ether_addr_copy(emac->mac_addr, ndev->dev_addr);
 
 	icssg_class_set_mac_addr(prueth->miig_rt, slice, emac->mac_addr);
-	icssg_ft1_set_mac_addr(prueth->miig_rt, slice, emac->mac_addr);
-
 	icssg_class_default(prueth->miig_rt, slice, 0, false);
+	icssg_ft1_set_mac_addr(prueth->miig_rt, slice, emac->mac_addr);
 
 	/* Notify the stack of the actual queue counts. */
 	ret = netif_set_real_num_tx_queues(ndev, num_data_chn);
@@ -829,6 +849,203 @@ bool prueth_dev_check(const struct net_device *ndev)
 	return false;
 }
 
+static void prueth_offload_fwd_mark_update(struct prueth *prueth)
+{
+	int set_val = 0;
+	int i;
+
+	if (prueth->br_members == (BIT(PRUETH_PORT_MII0) | BIT(PRUETH_PORT_MII1)))
+		set_val = 1;
+
+	dev_dbg(prueth->dev, "set offload_fwd_mark %d\n", set_val);
+
+	for (i = PRUETH_MAC0; i < PRUETH_NUM_MACS; i++) {
+		struct prueth_emac *emac = prueth->emac[i];
+
+		if (!emac || !emac->ndev)
+			continue;
+
+		emac->offload_fwd_mark = set_val;
+	}
+}
+
+static void prueth_emac_restart(struct prueth *prueth)
+{
+	struct prueth_emac *emac0 = prueth->emac[PRUETH_MAC0];
+	struct prueth_emac *emac1 = prueth->emac[PRUETH_MAC1];
+
+	/* Detach the net_device for both PRUeth ports*/
+	if (netif_running(emac0->ndev))
+		netif_device_detach(emac0->ndev);
+	if (netif_running(emac1->ndev))
+		netif_device_detach(emac1->ndev);
+
+	/* Disable both PRUeth ports */
+	emac_set_port_state(emac0, ICSSG_EMAC_PORT_DISABLE);
+	emac_set_port_state(emac1, ICSSG_EMAC_PORT_DISABLE);
+
+	/* Stop both pru cores for both PRUeth ports*/
+	prueth_emac_stop(emac0);
+	prueth->emacs_initialized--;
+	prueth_emac_stop(emac1);
+	prueth->emacs_initialized--;
+
+	/* Start both pru cores for both PRUeth ports */
+	prueth_emac_start(prueth, emac0);
+	prueth->emacs_initialized++;
+	prueth_emac_start(prueth, emac1);
+	prueth->emacs_initialized++;
+
+	/* Enable forwarding for both PRUeth ports */
+	emac_set_port_state(emac0, ICSSG_EMAC_PORT_FORWARD);
+	emac_set_port_state(emac1, ICSSG_EMAC_PORT_FORWARD);
+
+	/* Attache net_device for both PRUeth ports */
+	netif_device_attach(emac0->ndev);
+	netif_device_attach(emac1->ndev);
+}
+
+static void icssg_enable_switch_mode(struct prueth *prueth)
+{
+	struct prueth_emac *emac;
+	int mac;
+
+	prueth_emac_restart(prueth);
+
+	for (mac = PRUETH_MAC0; mac < PRUETH_NUM_MACS; mac++) {
+		emac = prueth->emac[mac];
+		if (netif_running(emac->ndev)) {
+			icssg_fdb_add_del(emac, eth_stp_addr, prueth->default_vlan,
+					  ICSSG_FDB_ENTRY_P0_MEMBERSHIP |
+					  ICSSG_FDB_ENTRY_P1_MEMBERSHIP |
+					  ICSSG_FDB_ENTRY_P2_MEMBERSHIP |
+					  ICSSG_FDB_ENTRY_BLOCK,
+					  true);
+			icssg_vtbl_modify(emac, emac->port_vlan | DEFAULT_VID,
+					  BIT(emac->port_id) | DEFAULT_PORT_MASK,
+					  BIT(emac->port_id) | DEFAULT_UNTAG_MASK,
+					  true);
+			icssg_set_pvid(prueth, emac->port_vlan, emac->port_id);
+			emac_set_port_state(emac, ICSSG_EMAC_PORT_VLAN_AWARE_ENABLE);
+		}
+	}
+}
+
+static int prueth_netdevice_port_link(struct net_device *ndev,
+				      struct net_device *br_ndev,
+				      struct netlink_ext_ack *extack)
+{
+	struct prueth_emac *emac = netdev_priv(ndev);
+	struct prueth *prueth = emac->prueth;
+	int err;
+
+	if (!prueth->br_members) {
+		prueth->hw_bridge_dev = br_ndev;
+	} else {
+		/* This is adding the port to a second bridge, this is
+		 * unsupported
+		 */
+		if (prueth->hw_bridge_dev != br_ndev)
+			return -EOPNOTSUPP;
+	}
+
+	err = switchdev_bridge_port_offload(br_ndev, ndev, emac,
+					    &prueth->prueth_switchdev_nb,
+					    &prueth->prueth_switchdev_bl_nb,
+					    false, extack);
+	if (err)
+		return err;
+
+	prueth->br_members |= BIT(emac->port_id);
+
+	if (!prueth->is_switch_mode) {
+		if (prueth->br_members & BIT(PRUETH_PORT_MII0) &&
+		    prueth->br_members & BIT(PRUETH_PORT_MII1)) {
+			prueth->is_switch_mode = true;
+			prueth->default_vlan = 1;
+			emac->port_vlan = prueth->default_vlan;
+			icssg_enable_switch_mode(prueth);
+		}
+	}
+
+	prueth_offload_fwd_mark_update(prueth);
+
+	return NOTIFY_DONE;
+}
+
+static void prueth_netdevice_port_unlink(struct net_device *ndev)
+{
+	struct prueth_emac *emac = netdev_priv(ndev);
+	struct prueth *prueth = emac->prueth;
+
+	prueth->br_members &= ~BIT(emac->port_id);
+
+	if (prueth->is_switch_mode) {
+		prueth->is_switch_mode = false;
+		emac->port_vlan = 0;
+		prueth_emac_restart(prueth);
+	}
+
+	prueth_offload_fwd_mark_update(prueth);
+
+	if (!prueth->br_members)
+		prueth->hw_bridge_dev = NULL;
+}
+
+/* netdev notifier */
+static int prueth_netdevice_event(struct notifier_block *unused,
+				  unsigned long event, void *ptr)
+{
+	struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
+	struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
+	struct netdev_notifier_changeupper_info *info;
+	int ret = NOTIFY_DONE;
+
+	if (ndev->netdev_ops != &emac_netdev_ops)
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_CHANGEUPPER:
+		info = ptr;
+
+		if (netif_is_bridge_master(info->upper_dev)) {
+			if (info->linking)
+				ret = prueth_netdevice_port_link(ndev, info->upper_dev, extack);
+			else
+				prueth_netdevice_port_unlink(ndev);
+		}
+		break;
+	default:
+		return NOTIFY_DONE;
+	}
+
+	return notifier_from_errno(ret);
+}
+
+static int prueth_register_notifiers(struct prueth *prueth)
+{
+	int ret = 0;
+
+	prueth->prueth_netdevice_nb.notifier_call = &prueth_netdevice_event;
+	ret = register_netdevice_notifier(&prueth->prueth_netdevice_nb);
+	if (ret) {
+		dev_err(prueth->dev, "can't register netdevice notifier\n");
+		return ret;
+	}
+
+	ret = prueth_switchdev_register_notifiers(prueth);
+	if (ret)
+		unregister_netdevice_notifier(&prueth->prueth_netdevice_nb);
+
+	return ret;
+}
+
+static void prueth_unregister_notifiers(struct prueth *prueth)
+{
+	prueth_switchdev_unregister_notifiers(prueth);
+	unregister_netdevice_notifier(&prueth->prueth_netdevice_nb);
+}
+
 static int prueth_probe(struct platform_device *pdev)
 {
 	struct device_node *eth_node, *eth_ports_node;
@@ -956,6 +1173,9 @@ static int prueth_probe(struct platform_device *pdev)
 	}
 
 	msmc_ram_size = MSMC_RAM_SIZE;
+	prueth->is_switchmode_supported = prueth->pdata.switch_mode;
+	if (prueth->is_switchmode_supported)
+		msmc_ram_size = MSMC_RAM_SIZE_SWITCH_MODE;
 
 	/* NOTE: FW bug needs buffer base to be 64KB aligned */
 	prueth->msmcram.va =
@@ -1051,6 +1271,14 @@ static int prueth_probe(struct platform_device *pdev)
 		phy_attached_info(prueth->emac[PRUETH_MAC1]->ndev->phydev);
 	}
 
+	if (prueth->is_switchmode_supported) {
+		ret = prueth_register_notifiers(prueth);
+		if (ret)
+			goto netdev_unregister;
+
+		sprintf(prueth->switch_id, "%s", dev_name(dev));
+	}
+
 	dev_info(dev, "TI PRU ethernet driver initialized: %s EMAC mode\n",
 		 (!eth0_node || !eth1_node) ? "single" : "dual");
 
@@ -1120,6 +1348,8 @@ static void prueth_remove(struct platform_device *pdev)
 	struct device_node *eth_node;
 	int i;
 
+	prueth_unregister_notifiers(prueth);
+
 	for (i = 0; i < PRUETH_NUM_MACS; i++) {
 		if (!prueth->registered_netdevs[i])
 			continue;
@@ -1161,10 +1391,12 @@ static void prueth_remove(struct platform_device *pdev)
 static const struct prueth_pdata am654_icssg_pdata = {
 	.fdqring_mode = K3_RINGACC_RING_MODE_MESSAGE,
 	.quirk_10m_link_issue = 1,
+	.switch_mode = 1,
 };
 
 static const struct prueth_pdata am64x_icssg_pdata = {
 	.fdqring_mode = K3_RINGACC_RING_MODE_RING,
+	.switch_mode = 1,
 };
 
 static const struct of_device_id prueth_dt_match[] = {
-- 
2.34.1

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