xref: /linux/drivers/net/ethernet/ti/icssg/icssg_prueth.c (revision 9e4e86a604dfd06402933467578c4b79f5412b2c)

// SPDX-License-Identifier: GPL-2.0

/* Texas Instruments ICSSG Ethernet Driver
 *
 * Copyright (C) 2018-2022 Texas Instruments Incorporated - https://www.ti.com/
 *
 */

#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dma/ti-cppi5.h>
#include <linux/etherdevice.h>
#include <linux/genalloc.h>
#include <linux/if_hsr.h>
#include <linux/if_vlan.h>
#include <linux/interrupt.h>
#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include <linux/platform_device.h>
#include <linux/phy.h>
#include <linux/property.h>
#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"
#include "icssg_switchdev.h"
#include "../k3-cppi-desc-pool.h"

#define PRUETH_MODULE_DESCRIPTION "PRUSS ICSSG Ethernet driver"

#define DEFAULT_VID		1
#define DEFAULT_PORT_MASK	1
#define DEFAULT_UNTAG_MASK	1

#define NETIF_PRUETH_HSR_OFFLOAD_FEATURES	(NETIF_F_HW_HSR_FWD | \
						 NETIF_F_HW_HSR_DUP | \
						 NETIF_F_HW_HSR_TAG_INS | \
						 NETIF_F_HW_HSR_TAG_RM)

#define PRUETH_RX_DMA_ATTR			(DMA_ATTR_SKIP_CPU_SYNC |\
						 DMA_ATTR_WEAK_ORDERING)

/* CTRLMMR_ICSSG_RGMII_CTRL register bits */
#define ICSSG_CTRL_RGMII_ID_MODE                BIT(24)

static void emac_adjust_link(struct net_device *ndev);

static int emac_get_tx_ts(struct prueth_emac *emac,
			  struct emac_tx_ts_response *rsp)
{
	struct prueth *prueth = emac->prueth;
	int slice = prueth_emac_slice(emac);
	int addr;

	addr = icssg_queue_pop(prueth, slice == 0 ?
			       ICSSG_TS_POP_SLICE0 : ICSSG_TS_POP_SLICE1);
	if (addr < 0)
		return addr;

	memcpy_fromio(rsp, prueth->shram.va + addr, sizeof(*rsp));
	/* return buffer back for to pool */
	icssg_queue_push(prueth, slice == 0 ?
			 ICSSG_TS_PUSH_SLICE0 : ICSSG_TS_PUSH_SLICE1, addr);

	return 0;
}

static void tx_ts_work(struct prueth_emac *emac)
{
	struct skb_shared_hwtstamps ssh;
	struct emac_tx_ts_response tsr;
	struct sk_buff *skb;
	int ret = 0;
	u32 hi_sw;
	u64 ns;

	/* There may be more than one pending requests */
	while (1) {
		ret = emac_get_tx_ts(emac, &tsr);
		if (ret) /* nothing more */
			break;

		if (tsr.cookie >= PRUETH_MAX_TX_TS_REQUESTS ||
		    !emac->tx_ts_skb[tsr.cookie]) {
			netdev_err(emac->ndev, "Invalid TX TS cookie 0x%x\n",
				   tsr.cookie);
			break;
		}

		skb = emac->tx_ts_skb[tsr.cookie];
		emac->tx_ts_skb[tsr.cookie] = NULL;	/* free slot */
		if (!skb) {
			netdev_err(emac->ndev, "Driver Bug! got NULL skb\n");
			break;
		}

		hi_sw = readl(emac->prueth->shram.va +
			      TIMESYNC_FW_WC_COUNT_HI_SW_OFFSET_OFFSET);
		ns = icssg_ts_to_ns(hi_sw, tsr.hi_ts, tsr.lo_ts,
				    IEP_DEFAULT_CYCLE_TIME_NS);

		memset(&ssh, 0, sizeof(ssh));
		ssh.hwtstamp = ns_to_ktime(ns);

		skb_tstamp_tx(skb, &ssh);
		dev_consume_skb_any(skb);

		if (atomic_dec_and_test(&emac->tx_ts_pending))	/* no more? */
			break;
	}
}

static irqreturn_t prueth_tx_ts_irq(int irq, void *dev_id)
{
	struct prueth_emac *emac = dev_id;

	/* currently only TX timestamp is being returned */
	tx_ts_work(emac);

	return IRQ_HANDLED;
}

static int prueth_start(struct rproc *rproc, const char *fw_name)
{
	int ret;

	ret = rproc_set_firmware(rproc, fw_name);
	if (ret)
		return ret;
	return rproc_boot(rproc);
}

static void prueth_shutdown(struct rproc *rproc)
{
	rproc_shutdown(rproc);
}

static int prueth_emac_start(struct prueth *prueth)
{
	struct icssg_firmwares *firmwares;
	struct device *dev = prueth->dev;
	int ret, slice;

	if (prueth->is_switch_mode)
		firmwares = prueth->icssg_switch_firmwares;
	else if (prueth->is_hsr_offload_mode && HSR_V1 == prueth->hsr_prp_version)
		firmwares = prueth->icssg_hsr_firmwares;
	else if (prueth->is_hsr_offload_mode && PRP_V1 == prueth->hsr_prp_version)
		firmwares = prueth->icssg_prp_firmwares;
	else
		firmwares = prueth->icssg_emac_firmwares;

	for (slice = 0; slice < PRUETH_NUM_MACS; slice++) {
		ret = prueth_start(prueth->pru[slice], firmwares[slice].pru);
		if (ret) {
			dev_err(dev, "failed to boot PRU%d: %d\n", slice, ret);
			goto unwind_slices;
		}

		ret = prueth_start(prueth->rtu[slice], firmwares[slice].rtu);
		if (ret) {
			dev_err(dev, "failed to boot RTU%d: %d\n", slice, ret);
			rproc_shutdown(prueth->pru[slice]);
			goto unwind_slices;
		}

		ret = prueth_start(prueth->txpru[slice], firmwares[slice].txpru);
		if (ret) {
			dev_err(dev, "failed to boot TX_PRU%d: %d\n", slice, ret);
			rproc_shutdown(prueth->rtu[slice]);
			rproc_shutdown(prueth->pru[slice]);
			goto unwind_slices;
		}
	}

	return 0;

unwind_slices:
	while (--slice >= 0) {
		prueth_shutdown(prueth->txpru[slice]);
		prueth_shutdown(prueth->rtu[slice]);
		prueth_shutdown(prueth->pru[slice]);
	}

	return ret;
}

static void prueth_emac_stop(struct prueth *prueth)
{
	int slice;

	for (slice = 0; slice < PRUETH_NUM_MACS; slice++) {
		prueth_shutdown(prueth->txpru[slice]);
		prueth_shutdown(prueth->rtu[slice]);
		prueth_shutdown(prueth->pru[slice]);
	}
}

static void icssg_enable_fw_offload(struct prueth *prueth)
{
	struct prueth_emac *emac;
	int mac;

	for (mac = PRUETH_MAC0; mac < PRUETH_NUM_MACS; mac++) {
		emac = prueth->emac[mac];
		if (prueth->is_hsr_offload_mode) {
			if (emac->ndev->features & NETIF_F_HW_HSR_TAG_RM)
				icssg_set_port_state(emac, ICSSG_EMAC_HSR_RX_OFFLOAD_ENABLE);
			else
				icssg_set_port_state(emac, ICSSG_EMAC_HSR_RX_OFFLOAD_DISABLE);
		}

		if (prueth->is_switch_mode || prueth->is_hsr_offload_mode) {
			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);
				if (prueth->is_hsr_offload_mode)
					icssg_vtbl_modify(emac, DEFAULT_VID,
							  DEFAULT_PORT_MASK,
							  DEFAULT_UNTAG_MASK, true);
				icssg_set_pvid(prueth, emac->port_vlan, emac->port_id);
				if (prueth->is_switch_mode)
					icssg_set_port_state(emac, ICSSG_EMAC_PORT_VLAN_AWARE_ENABLE);
			}
		}
	}
}

static int prueth_emac_common_start(struct prueth *prueth)
{
	struct prueth_emac *emac;
	int ret = 0;
	int slice;

	if (!prueth->emac[ICSS_SLICE0] && !prueth->emac[ICSS_SLICE1])
		return -EINVAL;

	/* clear SMEM and MSMC settings for all slices */
	memset_io(prueth->msmcram.va, 0, prueth->msmcram.size);
	memset_io(prueth->shram.va, 0, ICSSG_CONFIG_OFFSET_SLICE1 * PRUETH_NUM_MACS);

	icssg_class_default(prueth->miig_rt, ICSS_SLICE0, 0, false);
	icssg_class_default(prueth->miig_rt, ICSS_SLICE1, 0, false);

	/* Configure HSR/PRP protocol filtering if in HSR offload mode */
	if (prueth->is_hsr_offload_mode) {
		icssg_ft3_hsr_configurations(prueth->miig_rt, ICSS_SLICE0, prueth);
		icssg_ft3_hsr_configurations(prueth->miig_rt, ICSS_SLICE1, prueth);
	}

	if (prueth->is_switch_mode || prueth->is_hsr_offload_mode)
		icssg_init_fw_offload_mode(prueth);
	else
		icssg_init_emac_mode(prueth);

	for (slice = 0; slice < PRUETH_NUM_MACS; slice++) {
		emac = prueth->emac[slice];
		if (!emac)
			continue;
		ret = icssg_config(prueth, emac, slice);
		if (ret)
			goto disable_class;

		/* Reset link state to force reconfiguration in
		 * emac_adjust_link(). Without this, if the link was already up
		 * before restart, emac_adjust_link() won't detect any state
		 * change and will skip critical configuration like writing
		 * speed to firmware.
		 */
		emac->link = 0;

		mutex_lock(&emac->ndev->phydev->lock);
		emac_adjust_link(emac->ndev);
		mutex_unlock(&emac->ndev->phydev->lock);
	}

	ret = prueth_emac_start(prueth);
	if (ret)
		goto disable_class;

	emac = prueth->emac[ICSS_SLICE0] ? prueth->emac[ICSS_SLICE0] :
	       prueth->emac[ICSS_SLICE1];
	ret = icss_iep_init(emac->iep, &prueth_iep_clockops,
			    emac, IEP_DEFAULT_CYCLE_TIME_NS);
	if (ret) {
		dev_err(prueth->dev, "Failed to initialize IEP module\n");
		goto stop_pruss;
	}

	return 0;

stop_pruss:
	prueth_emac_stop(prueth);

disable_class:
	icssg_class_disable(prueth->miig_rt, ICSS_SLICE0);
	icssg_class_disable(prueth->miig_rt, ICSS_SLICE1);

	return ret;
}

static int prueth_emac_common_stop(struct prueth *prueth)
{
	struct prueth_emac *emac;

	if (!prueth->emac[ICSS_SLICE0] && !prueth->emac[ICSS_SLICE1])
		return -EINVAL;

	icssg_class_disable(prueth->miig_rt, ICSS_SLICE0);
	icssg_class_disable(prueth->miig_rt, ICSS_SLICE1);

	prueth_emac_stop(prueth);

	emac = prueth->emac[ICSS_SLICE0] ? prueth->emac[ICSS_SLICE0] :
	       prueth->emac[ICSS_SLICE1];
	icss_iep_exit(emac->iep);

	return 0;
}

/* called back by PHY layer if there is change in link state of hw port*/
static void emac_adjust_link(struct net_device *ndev)
{
	struct prueth_emac *emac = netdev_priv(ndev);
	struct phy_device *phydev = ndev->phydev;
	struct prueth *prueth = emac->prueth;
	bool new_state = false;
	unsigned long flags;

	if (phydev->link) {
		/* check the mode of operation - full/half duplex */
		if (phydev->duplex != emac->duplex) {
			new_state = true;
			emac->duplex = phydev->duplex;
		}
		if (phydev->speed != emac->speed) {
			new_state = true;
			emac->speed = phydev->speed;
		}
		if (!emac->link) {
			new_state = true;
			emac->link = 1;
		}
	} else if (emac->link) {
		new_state = true;
		emac->link = 0;

		/* f/w should support 100 & 1000 */
		emac->speed = SPEED_1000;

		/* half duplex may not be supported by f/w */
		emac->duplex = DUPLEX_FULL;
	}

	if (new_state) {
		phy_print_status(phydev);

		/* update RGMII and MII configuration based on PHY negotiated
		 * values
		 */
		if (emac->link) {
			if (emac->duplex == DUPLEX_HALF)
				icssg_config_half_duplex(emac);
			/* Set the RGMII cfg for gig en and full duplex */
			icssg_update_rgmii_cfg(prueth->miig_rt, emac);

			/* update the Tx IPG based on 100M/1G speed */
			spin_lock_irqsave(&emac->lock, flags);
			icssg_config_ipg(emac);
			spin_unlock_irqrestore(&emac->lock, flags);
			icssg_config_set_speed(emac);
			icssg_set_port_state(emac, ICSSG_EMAC_PORT_FORWARD);

		} else {
			icssg_set_port_state(emac, ICSSG_EMAC_PORT_DISABLE);
		}
	}

	if (emac->link) {
		/* reactivate the transmit queue */
		netif_tx_wake_all_queues(ndev);
	} else {
		netif_tx_stop_all_queues(ndev);
		prueth_cleanup_tx_ts(emac);
	}
}

static enum hrtimer_restart emac_rx_timer_callback(struct hrtimer *timer)
{
	struct prueth_emac *emac =
			container_of(timer, struct prueth_emac, rx_hrtimer);
	int rx_flow = PRUETH_RX_FLOW_DATA;

	if (emac->rx_chns.irq_disabled) {
		/* re-enable the RX IRQ */
		emac->rx_chns.irq_disabled = false;
		enable_irq(emac->rx_chns.irq[rx_flow]);
	}
	return HRTIMER_NORESTART;
}

static int emac_phy_connect(struct prueth_emac *emac)
{
	struct prueth *prueth = emac->prueth;
	struct net_device *ndev = emac->ndev;
	/* connect PHY */
	ndev->phydev = of_phy_connect(emac->ndev, emac->phy_node,
				      &emac_adjust_link, 0,
				      emac->phy_if);
	if (!ndev->phydev) {
		dev_err(prueth->dev, "couldn't connect to phy %s\n",
			emac->phy_node->full_name);
		return -ENODEV;
	}

	if (!emac->half_duplex) {
		dev_dbg(prueth->dev, "half duplex mode is not supported\n");
		phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT);
		phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT);
	}

	/* remove unsupported modes */
	phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);
	phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_Pause_BIT);
	phy_remove_link_mode(ndev->phydev, ETHTOOL_LINK_MODE_Asym_Pause_BIT);

	if (emac->phy_if == PHY_INTERFACE_MODE_MII)
		phy_set_max_speed(ndev->phydev, SPEED_100);

	return 0;
}

static u64 prueth_iep_gettime(void *clockops_data, struct ptp_system_timestamp *sts)
{
	u32 hi_rollover_count, hi_rollover_count_r;
	struct prueth_emac *emac = clockops_data;
	struct prueth *prueth = emac->prueth;
	void __iomem *fw_hi_r_count_addr;
	void __iomem *fw_count_hi_addr;
	u32 iepcount_hi, iepcount_hi_r;
	unsigned long flags;
	u32 iepcount_lo;
	u64 ts = 0;

	fw_count_hi_addr = prueth->shram.va + TIMESYNC_FW_WC_COUNT_HI_SW_OFFSET_OFFSET;
	fw_hi_r_count_addr = prueth->shram.va + TIMESYNC_FW_WC_HI_ROLLOVER_COUNT_OFFSET;

	local_irq_save(flags);
	do {
		iepcount_hi = icss_iep_get_count_hi(emac->iep);
		iepcount_hi += readl(fw_count_hi_addr);
		hi_rollover_count = readl(fw_hi_r_count_addr);
		ptp_read_system_prets(sts);
		iepcount_lo = icss_iep_get_count_low(emac->iep);
		ptp_read_system_postts(sts);

		iepcount_hi_r = icss_iep_get_count_hi(emac->iep);
		iepcount_hi_r += readl(fw_count_hi_addr);
		hi_rollover_count_r = readl(fw_hi_r_count_addr);
	} while ((iepcount_hi_r != iepcount_hi) ||
		 (hi_rollover_count != hi_rollover_count_r));
	local_irq_restore(flags);

	ts = ((u64)hi_rollover_count) << 23 | iepcount_hi;
	ts = ts * (u64)IEP_DEFAULT_CYCLE_TIME_NS + iepcount_lo;

	return ts;
}

static void prueth_iep_settime(void *clockops_data, u64 ns)
{
	struct icssg_setclock_desc __iomem *sc_descp;
	struct prueth_emac *emac = clockops_data;
	struct icssg_setclock_desc sc_desc;
	u64 cyclecount;
	u32 cycletime;
	int timeout;

	sc_descp = emac->prueth->shram.va + TIMESYNC_FW_WC_SETCLOCK_DESC_OFFSET;

	cycletime = IEP_DEFAULT_CYCLE_TIME_NS;
	cyclecount = ns / cycletime;

	memset(&sc_desc, 0, sizeof(sc_desc));
	sc_desc.margin = cycletime - 1000;
	sc_desc.cyclecounter0_set = cyclecount & GENMASK(31, 0);
	sc_desc.cyclecounter1_set = (cyclecount & GENMASK(63, 32)) >> 32;
	sc_desc.iepcount_set = ns % cycletime;
	/* Count from 0 to (cycle time) - emac->iep->def_inc */
	sc_desc.CMP0_current = cycletime - emac->iep->def_inc;

	memcpy_toio(sc_descp, &sc_desc, sizeof(sc_desc));

	writeb(1, &sc_descp->request);

	timeout = 5;	/* fw should take 2-3 ms */
	while (timeout--) {
		if (readb(&sc_descp->acknowledgment))
			return;

		usleep_range(500, 1000);
	}

	dev_err(emac->prueth->dev, "settime timeout\n");
}

static int prueth_perout_enable(void *clockops_data,
				struct ptp_perout_request *req, int on,
				u64 *cmp)
{
	struct prueth_emac *emac = clockops_data;
	u32 reduction_factor = 0, offset = 0;
	struct timespec64 ts;
	u64 current_cycle;
	u64 start_offset;
	u64 ns_period;

	if (!on)
		return 0;

	/* Any firmware specific stuff for PPS/PEROUT handling */
	ts.tv_sec = req->period.sec;
	ts.tv_nsec = req->period.nsec;
	ns_period = timespec64_to_ns(&ts);

	/* f/w doesn't support period less than cycle time */
	if (ns_period < IEP_DEFAULT_CYCLE_TIME_NS)
		return -ENXIO;

	reduction_factor = ns_period / IEP_DEFAULT_CYCLE_TIME_NS;
	offset = ns_period % IEP_DEFAULT_CYCLE_TIME_NS;

	/* f/w requires at least 1uS within a cycle so CMP
	 * can trigger after SYNC is enabled
	 */
	if (offset < 5 * NSEC_PER_USEC)
		offset = 5 * NSEC_PER_USEC;

	/* if offset is close to cycle time then we will miss
	 * the CMP event for last tick when IEP rolls over.
	 * In normal mode, IEP tick is 4ns.
	 * In slow compensation it could be 0ns or 8ns at
	 * every slow compensation cycle.
	 */
	if (offset > IEP_DEFAULT_CYCLE_TIME_NS - 8)
		offset = IEP_DEFAULT_CYCLE_TIME_NS - 8;

	/* we're in shadow mode so need to set upper 32-bits */
	*cmp = (u64)offset << 32;

	writel(reduction_factor, emac->prueth->shram.va +
		TIMESYNC_FW_WC_SYNCOUT_REDUCTION_FACTOR_OFFSET);

	current_cycle = icssg_read_time(emac->prueth->shram.va +
					TIMESYNC_FW_WC_CYCLECOUNT_OFFSET);

	/* Rounding of current_cycle count to next second */
	start_offset = roundup(current_cycle, MSEC_PER_SEC);

	hi_lo_writeq(start_offset, emac->prueth->shram.va +
		     TIMESYNC_FW_WC_SYNCOUT_START_TIME_CYCLECOUNT_OFFSET);

	return 0;
}

const struct icss_iep_clockops prueth_iep_clockops = {
	.settime = prueth_iep_settime,
	.gettime = prueth_iep_gettime,
	.perout_enable = prueth_perout_enable,
};

static void prueth_destroy_xdp_rxqs(struct prueth_emac *emac)
{
	struct xdp_rxq_info *rxq = &emac->rx_chns.xdp_rxq;

	if (xdp_rxq_info_is_reg(rxq))
		xdp_rxq_info_unreg(rxq);
}

static int prueth_create_xdp_rxqs(struct prueth_emac *emac)
{
	struct xdp_rxq_info *rxq = &emac->rx_chns.xdp_rxq;
	struct page_pool *pool = emac->rx_chns.pg_pool;
	struct prueth_rx_chn *rx_chn = &emac->rx_chns;
	int ret;

	ret = xdp_rxq_info_reg(rxq, emac->ndev, 0, emac->napi_rx.napi_id);
	if (ret)
		return ret;

	if (rx_chn->xsk_pool) {
		ret = xdp_rxq_info_reg_mem_model(rxq, MEM_TYPE_XSK_BUFF_POOL, NULL);
		if (ret)
			goto xdp_unreg;
		xsk_pool_set_rxq_info(rx_chn->xsk_pool, rxq);
	} else {
		ret = xdp_rxq_info_reg_mem_model(rxq, MEM_TYPE_PAGE_POOL, pool);
		if (ret)
			goto xdp_unreg;
	}

	return 0;

xdp_unreg:
	prueth_destroy_xdp_rxqs(emac);
	return ret;
}

static int icssg_prueth_add_mcast(struct net_device *ndev, const u8 *addr)
{
	struct net_device *real_dev;
	struct prueth_emac *emac;
	int port_mask;
	u8 vlan_id;

	vlan_id = is_vlan_dev(ndev) ? vlan_dev_vlan_id(ndev) : PRUETH_DFLT_VLAN_MAC;
	real_dev = is_vlan_dev(ndev) ? vlan_dev_real_dev(ndev) : ndev;
	emac = netdev_priv(real_dev);

	port_mask = BIT(emac->port_id) | icssg_fdb_lookup(emac, addr, vlan_id);
	icssg_fdb_add_del(emac, addr, vlan_id, port_mask, true);
	icssg_vtbl_modify(emac, vlan_id, port_mask, port_mask, true);

	return 0;
}

static int icssg_prueth_del_mcast(struct net_device *ndev, const u8 *addr)
{
	struct net_device *real_dev;
	struct prueth_emac *emac;
	int other_port_mask;
	int port_mask;
	u8 vlan_id;

	vlan_id = is_vlan_dev(ndev) ? vlan_dev_vlan_id(ndev) : PRUETH_DFLT_VLAN_MAC;
	real_dev = is_vlan_dev(ndev) ? vlan_dev_real_dev(ndev) : ndev;
	emac = netdev_priv(real_dev);

	port_mask = BIT(emac->port_id);
	other_port_mask = port_mask ^ icssg_fdb_lookup(emac, addr, vlan_id);

	icssg_fdb_add_del(emac, addr, vlan_id, port_mask, false);
	icssg_vtbl_modify(emac, vlan_id, port_mask, port_mask, false);

	if (other_port_mask) {
		icssg_fdb_add_del(emac, addr, vlan_id, other_port_mask, true);
		icssg_vtbl_modify(emac, vlan_id, other_port_mask,
				  other_port_mask, true);
	}

	return 0;
}

/**
 * icssg_is_addr_synced - Check if address is synced from HSR master
 * @ndev: network device
 * @addr: multicast MAC address
 *
 * Checks if the address is synced from HSR master (hsr0) via
 * dev_mc_sync_multiple() or added directly to the slave port.
 *
 * Return: true if synced from HSR master, false if added directly
 */
static bool icssg_is_addr_synced(struct net_device *ndev, const u8 *addr)
{
	struct netdev_hw_addr *ha;
	bool is_synced = false;

	netif_addr_lock_bh(ndev);
	netdev_for_each_mc_addr(ha, ndev) {
		if (ether_addr_equal(ha->addr, addr)) {
			is_synced = ha->synced;
			break;
		}
	}
	netif_addr_unlock_bh(ndev);

	return is_synced;
}

/**
 * icssg_hsr_fdb_update - Update FDB and VLAN table for HSR multicast
 * @emac: PRUETH EMAC private data
 * @addr: multicast MAC address
 * @vid: VLAN ID
 * @port_membership: port membership bitmap (P0=0x1, P1=0x2, P2=0x4)
 * @add: true to add entry, false to delete
 *
 * Updates both FDB and VLAN table entries for the given address.
 */
static void icssg_hsr_fdb_update(struct prueth_emac *emac, const u8 *addr,
				 u8 vid, u8 port_membership, bool add)
{
	icssg_fdb_add_del(emac, addr, vid, port_membership, add);
	icssg_vtbl_modify(emac, vid, BIT(emac->port_id),
			  BIT(emac->port_id), add);
}

/**
 * icssg_prueth_hsr_fdb_add_del - Manage FDB port membership for HSR multicast
 * @emac: PRUETH EMAC private data
 * @addr: multicast MAC address
 * @vid: VLAN ID
 * @is_synced: true if synced from HSR master, false if added directly
 * @is_vlan_path: true if called from VLAN interface path, false for direct path
 * @add: true to add/update, false to remove
 *
 * Manages FDB port membership bits (P0/P1/P2) for multicast addresses.
 * On add: accumulates membership with existing ports.
 * On delete: removes only the specific port, cleans up orphaned P0 if needed.
 */
static void icssg_prueth_hsr_fdb_add_del(struct prueth_emac *emac,
					 const u8 *addr, u8 vid,
					 bool is_synced, bool is_vlan_path,
					 bool add)
{
	int existing_membership, other_port_membership;
	u8 port_membership;

	/* Set P0 (HSR master) bit when:
	 * - Address is synced from HSR master (is_synced=true), OR
	 * - In HSR offload mode AND it's a VLAN interface (is_vlan_path=true)
	 * This ensures VLAN interfaces on HSR master (hsr0.X) also get P0 set.
	 */
	if (is_synced || (emac->prueth->is_hsr_offload_mode && is_vlan_path))
		port_membership = ICSSG_FDB_ENTRY_P0_MEMBERSHIP | BIT(emac->port_id);
	else
		port_membership = BIT(emac->port_id);
	existing_membership = icssg_fdb_lookup(emac, addr, vid);
	if (existing_membership < 0) {
		netdev_dbg(emac->ndev,
			   "FDB lookup failed for %pM: %d, assuming no existing entry\n",
			   addr, existing_membership);
		existing_membership = 0;
	}

	if (add) {
		/* Accumulate with existing membership */
		port_membership |= existing_membership;

		netdev_dbg(emac->ndev,
			   "FDB add %pM: P%d%s -> membership 0x%x\n",
			   addr, emac->port_id, is_synced ? "+P0" : "",
			   port_membership);

		icssg_hsr_fdb_update(emac, addr, vid, port_membership, true);
	} else {
		other_port_membership = existing_membership & ~port_membership;

		/* Clean up orphaned P0 if neither HSR synced nor VLAN path */
		if (!is_synced && !is_vlan_path &&
		    (existing_membership & ICSSG_FDB_ENTRY_P0_MEMBERSHIP))
			other_port_membership &=
				~ICSSG_FDB_ENTRY_P0_MEMBERSHIP;

		netdev_dbg(emac->ndev,
			   "FDB del %pM: 0x%x -> 0x%x\n",
			   addr, existing_membership, other_port_membership);

		icssg_hsr_fdb_update(emac, addr, vid, port_membership, false);

		if (other_port_membership)
			icssg_hsr_fdb_update(emac, addr, vid,
					     other_port_membership, true);
	}
}

static int icssg_prueth_hsr_add_mcast(struct net_device *ndev, const u8 *addr)
{
	struct net_device *real_dev, *port_dev;
	bool is_synced, is_vlan_path;
	struct prueth_emac *emac;
	u8 vlan_id, i;

	is_vlan_path = is_vlan_dev(ndev);
	vlan_id = is_vlan_path ? vlan_dev_vlan_id(ndev) : PRUETH_DFLT_VLAN_HSR;
	real_dev = is_vlan_path ? vlan_dev_real_dev(ndev) : ndev;

	/* Check if this address is synced from HSR master */
	is_synced = icssg_is_addr_synced(ndev, addr);

	if (is_hsr_master(real_dev)) {
		for (i = HSR_PT_SLAVE_A; i < HSR_PT_INTERLINK; i++) {
			port_dev = hsr_get_port_ndev(real_dev, i);
			emac = netdev_priv(port_dev);
			if (!emac) {
				dev_put(port_dev);
				return -EINVAL;
			}
			icssg_prueth_hsr_fdb_add_del(emac, addr, vlan_id,
						     is_synced, is_vlan_path,
						     true);
			dev_put(port_dev);
		}
	} else {
		emac = netdev_priv(real_dev);
		icssg_prueth_hsr_fdb_add_del(emac, addr, vlan_id,
					     is_synced, is_vlan_path, true);
	}

	return 0;
}

static int icssg_prueth_hsr_del_mcast(struct net_device *ndev, const u8 *addr)
{
	struct net_device *real_dev, *port_dev;
	bool is_synced, is_vlan_path;
	struct prueth_emac *emac;
	u8 vlan_id, i;

	is_vlan_path = is_vlan_dev(ndev);
	vlan_id = is_vlan_path ? vlan_dev_vlan_id(ndev) : PRUETH_DFLT_VLAN_HSR;
	real_dev = is_vlan_path ? vlan_dev_real_dev(ndev) : ndev;

	/* Check if this address was synced from HSR master */
	is_synced = icssg_is_addr_synced(ndev, addr);

	if (is_hsr_master(real_dev)) {
		for (i = HSR_PT_SLAVE_A; i < HSR_PT_INTERLINK; i++) {
			port_dev = hsr_get_port_ndev(real_dev, i);
			emac = netdev_priv(port_dev);
			if (!emac) {
				dev_put(port_dev);
				return -EINVAL;
			}
			icssg_prueth_hsr_fdb_add_del(emac, addr, vlan_id,
						     is_synced, is_vlan_path,
						     false);
			dev_put(port_dev);
		}
	} else {
		emac = netdev_priv(real_dev);
		icssg_prueth_hsr_fdb_add_del(emac, addr, vlan_id,
					     is_synced, is_vlan_path, false);
	}

	return 0;
}

static int icssg_update_vlan_mcast(struct net_device *vdev, int vid,
				   void *args)
{
	struct prueth_emac *emac = args;

	if (!vdev || !vid)
		return 0;

	netif_addr_lock_bh(vdev);
	__hw_addr_sync_multiple(&emac->vlan_mcast_list[vid], &vdev->mc,
				vdev->addr_len);
	netif_addr_unlock_bh(vdev);

	if (emac->prueth->is_hsr_offload_mode)
		__hw_addr_sync_dev(&emac->vlan_mcast_list[vid], vdev,
				   icssg_prueth_hsr_add_mcast,
				   icssg_prueth_hsr_del_mcast);
	else
		__hw_addr_sync_dev(&emac->vlan_mcast_list[vid], vdev,
				   icssg_prueth_add_mcast,
				   icssg_prueth_del_mcast);

	return 0;
}

static void prueth_set_xsk_pool(struct prueth_emac *emac, u16 queue_id)
{
	struct prueth_tx_chn *tx_chn = &emac->tx_chns[queue_id];
	struct prueth_rx_chn *rx_chn = &emac->rx_chns;

	if (emac->xsk_qid != queue_id) {
		rx_chn->xsk_pool = NULL;
		tx_chn->xsk_pool = NULL;
	} else {
		rx_chn->xsk_pool = xsk_get_pool_from_qid(emac->ndev, queue_id);
		tx_chn->xsk_pool = xsk_get_pool_from_qid(emac->ndev, queue_id);
	}
}

static void prueth_destroy_txq(struct prueth_emac *emac)
{
	int ret, i;

	atomic_set(&emac->tdown_cnt, emac->tx_ch_num);
	/* ensure new tdown_cnt value is visible */
	smp_mb__after_atomic();
	/* tear down and disable UDMA channels */
	reinit_completion(&emac->tdown_complete);
	for (i = 0; i < emac->tx_ch_num; i++)
		k3_udma_glue_tdown_tx_chn(emac->tx_chns[i].tx_chn, false);

	ret = wait_for_completion_timeout(&emac->tdown_complete,
					  msecs_to_jiffies(1000));
	if (!ret)
		netdev_err(emac->ndev, "tx teardown timeout\n");

	for (i = 0; i < emac->tx_ch_num; i++) {
		napi_disable(&emac->tx_chns[i].napi_tx);
		hrtimer_cancel(&emac->tx_chns[i].tx_hrtimer);
		k3_udma_glue_reset_tx_chn(emac->tx_chns[i].tx_chn,
					  &emac->tx_chns[i],
					  prueth_tx_cleanup);
		k3_udma_glue_disable_tx_chn(emac->tx_chns[i].tx_chn);
	}
}

static void prueth_destroy_rxq(struct prueth_emac *emac)
{
	int i, ret;

	/* tear down and disable UDMA channels */
	reinit_completion(&emac->tdown_complete);
	k3_udma_glue_tdown_rx_chn(emac->rx_chns.rx_chn, true);

	/* When RX DMA Channel Teardown is initiated, it will result in an
	 * interrupt and a Teardown Completion Marker (TDCM) is queued into
	 * the RX Completion queue. Acknowledging the interrupt involves
	 * popping the TDCM descriptor from the RX Completion queue via the
	 * RX NAPI Handler. To avoid timing out when waiting for the TDCM to
	 * be popped, schedule the RX NAPI handler to run immediately.
	 */
	if (!napi_if_scheduled_mark_missed(&emac->napi_rx)) {
		if (napi_schedule_prep(&emac->napi_rx))
			__napi_schedule(&emac->napi_rx);
	}

	ret = wait_for_completion_timeout(&emac->tdown_complete,
					  msecs_to_jiffies(1000));
	if (!ret)
		netdev_err(emac->ndev, "rx teardown timeout\n");

	for (i = 0; i < PRUETH_MAX_RX_FLOWS; i++) {
		napi_disable(&emac->napi_rx);
		hrtimer_cancel(&emac->rx_hrtimer);
		k3_udma_glue_reset_rx_chn(emac->rx_chns.rx_chn, i,
					  &emac->rx_chns,
					  prueth_rx_cleanup);
	}

	prueth_destroy_xdp_rxqs(emac);
	k3_udma_glue_disable_rx_chn(emac->rx_chns.rx_chn);
}

static int prueth_create_txq(struct prueth_emac *emac)
{
	int ret, i;

	for (i = 0; i < emac->tx_ch_num; i++) {
		ret = k3_udma_glue_enable_tx_chn(emac->tx_chns[i].tx_chn);
		if (ret)
			goto reset_tx_chan;
		napi_enable(&emac->tx_chns[i].napi_tx);
	}
	return 0;

reset_tx_chan:
	/* Since interface is not yet up, there is wouldn't be
	 * any SKB for completion. So set false to free_skb
	 */
	prueth_reset_tx_chan(emac, i, false);
	return ret;
}

static int prueth_create_rxq(struct prueth_emac *emac)
{
	int ret;

	ret = prueth_prepare_rx_chan(emac, &emac->rx_chns, PRUETH_MAX_PKT_SIZE);
	if (ret)
		return ret;

	ret = k3_udma_glue_enable_rx_chn(emac->rx_chns.rx_chn);
	if (ret)
		goto reset_rx_chn;

	ret = prueth_create_xdp_rxqs(emac);
	if (ret)
		goto reset_rx_chn;

	napi_enable(&emac->napi_rx);
	return 0;

reset_rx_chn:
	prueth_reset_rx_chan(&emac->rx_chns, PRUETH_MAX_RX_FLOWS, false);
	return ret;
}

/**
 * emac_ndo_open - EMAC device open
 * @ndev: network adapter device
 *
 * Called when system wants to start the interface.
 *
 * Return: 0 for a successful open, or appropriate error code
 */
static int emac_ndo_open(struct net_device *ndev)
{
	struct prueth_emac *emac = netdev_priv(ndev);
	int ret, num_data_chn = emac->tx_ch_num;
	struct icssg_flow_cfg __iomem *flow_cfg;
	struct prueth *prueth = emac->prueth;
	int slice = prueth_emac_slice(emac);
	struct device *dev = prueth->dev;
	int max_rx_flows;
	int rx_flow;

	/* set h/w MAC as user might have re-configured */
	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);

	/* Notify the stack of the actual queue counts. */
	ret = netif_set_real_num_tx_queues(ndev, num_data_chn);
	if (ret) {
		dev_err(dev, "cannot set real number of tx queues\n");
		return ret;
	}

	emac->xsk_qid = -EINVAL;
	init_completion(&emac->cmd_complete);
	ret = prueth_init_tx_chns(emac);
	if (ret) {
		dev_err(dev, "failed to init tx channel: %d\n", ret);
		return ret;
	}

	max_rx_flows = PRUETH_MAX_RX_FLOWS;
	ret = prueth_init_rx_chns(emac, &emac->rx_chns, "rx",
				  max_rx_flows, PRUETH_MAX_RX_DESC);
	if (ret) {
		dev_err(dev, "failed to init rx channel: %d\n", ret);
		goto cleanup_tx;
	}

	ret = prueth_ndev_add_tx_napi(emac);
	if (ret)
		goto cleanup_rx;

	/* we use only the highest priority flow for now i.e. @irq[3] */
	rx_flow = PRUETH_RX_FLOW_DATA;
	ret = request_irq(emac->rx_chns.irq[rx_flow], prueth_rx_irq,
			  IRQF_TRIGGER_HIGH, dev_name(dev), emac);
	if (ret) {
		dev_err(dev, "unable to request RX IRQ\n");
		goto cleanup_napi;
	}

	if (!prueth->emacs_initialized) {
		ret = prueth_emac_common_start(prueth);
		if (ret)
			goto free_rx_irq;
		icssg_enable_fw_offload(prueth);
	}

	flow_cfg = emac->dram.va + ICSSG_CONFIG_OFFSET + PSI_L_REGULAR_FLOW_ID_BASE_OFFSET;
	writew(emac->rx_flow_id_base, &flow_cfg->rx_base_flow);
	ret = emac_fdb_flow_id_updated(emac);

	if (ret) {
		netdev_err(ndev, "Failed to update Rx Flow ID %d", ret);
		goto stop;
	}

	icssg_mii_update_mtu(prueth->mii_rt, slice, ndev->max_mtu);

	ret = request_threaded_irq(emac->tx_ts_irq, NULL, prueth_tx_ts_irq,
				   IRQF_ONESHOT, dev_name(dev), emac);
	if (ret)
		goto stop;

	/* Prepare RX */
	ret = prueth_create_rxq(emac);
	if (ret)
		goto free_tx_ts_irq;

	ret = prueth_create_txq(emac);
	if (ret)
		goto destroy_rxq;

	/* start PHY */
	phy_start(ndev->phydev);

	prueth->emacs_initialized++;

	queue_work(system_long_wq, &emac->stats_work.work);

	return 0;

destroy_rxq:
	prueth_destroy_rxq(emac);
free_tx_ts_irq:
	free_irq(emac->tx_ts_irq, emac);
stop:
	if (!prueth->emacs_initialized)
		prueth_emac_common_stop(prueth);
free_rx_irq:
	free_irq(emac->rx_chns.irq[rx_flow], emac);
cleanup_napi:
	prueth_ndev_del_tx_napi(emac, emac->tx_ch_num);
cleanup_rx:
	prueth_cleanup_rx_chns(emac, &emac->rx_chns, max_rx_flows);
cleanup_tx:
	prueth_cleanup_tx_chns(emac);

	return ret;
}

/**
 * emac_ndo_stop - EMAC device stop
 * @ndev: network adapter device
 *
 * Called when system wants to stop or down the interface.
 *
 * Return: Always 0 (Success)
 */
static int emac_ndo_stop(struct net_device *ndev)
{
	struct prueth_emac *emac = netdev_priv(ndev);
	struct prueth *prueth = emac->prueth;

	/* inform the upper layers. */
	netif_tx_stop_all_queues(ndev);

	/* block packets from wire */
	if (ndev->phydev)
		phy_stop(ndev->phydev);

	if (emac->prueth->is_hsr_offload_mode)
		__dev_mc_unsync(ndev, icssg_prueth_hsr_del_mcast);
	else
		__dev_mc_unsync(ndev, icssg_prueth_del_mcast);

	prueth_destroy_txq(emac);
	prueth_destroy_rxq(emac);

	cancel_work_sync(&emac->rx_mode_work);

	/* Destroying the queued work in ndo_stop() */
	cancel_delayed_work_sync(&emac->stats_work);

	/* stop PRUs */
	if (prueth->emacs_initialized == 1)
		prueth_emac_common_stop(prueth);

	free_irq(emac->tx_ts_irq, emac);

	free_irq(emac->rx_chns.irq[PRUETH_RX_FLOW_DATA], emac);
	prueth_ndev_del_tx_napi(emac, emac->tx_ch_num);

	prueth_cleanup_rx_chns(emac, &emac->rx_chns, PRUETH_MAX_RX_FLOWS);
	prueth_cleanup_tx_chns(emac);

	prueth->emacs_initialized--;

	return 0;
}

/**
 * icssg_hsr_handle_multicast_sync() - Handle HSR multicast overlapping memberships
 * @emac: PRUETH EMAC private structure
 *
 * Post-process multicast addresses to handle overlapping memberships where
 * the same address is added from multiple paths (hsr0 + eth1). The kernel
 * increments refcount without triggering callbacks, so manually check refcount
 * to detect and update FDB port membership accordingly.
 */
static void icssg_hsr_handle_multicast_sync(struct prueth_emac *emac)
{
	struct hsr_mcast_update {
		struct list_head list;
		u8 addr[ETH_ALEN];
		int refcount;
		bool synced;
	};
	struct hsr_mcast_update *update, *tmp;
	struct net_device *ndev = emac->ndev;
	u8 vlan_id = PRUETH_DFLT_VLAN_HSR;
	struct netdev_hw_addr *ha;
	int existing_membership;
	LIST_HEAD(update_list);
	u8 port_membership;

	/* Handle overlapping memberships: When the same address
	 * is added from multiple paths (hsr0 + eth1), kernel
	 * increments refcount without triggering callbacks.
	 * Manually check refcount to detect:
	 * - refcount=2 + synced: HSR only, membership = P0
	 * - refcount>=3 + synced: HSR + direct, membership = P0|Px
	 * - !synced but P0 set: HSR removed, clean up orphaned P0
	 *
	 * Collect addresses to update while holding the lock, then
	 * process them after releasing the lock to avoid sleeping
	 * while atomic (icssg_fdb_lookup/update can sleep).
	 */
	netif_addr_lock_bh(ndev);
	netdev_for_each_mc_addr(ha, ndev) {
		/* Queue this address for processing.
		 * We need to check existing_membership via FDB lookup
		 * (which can sleep), so defer that until after unlock.
		 * Save synced/refcount to reproduce original logic.
		 */
		update = kmalloc_obj(*update, GFP_ATOMIC);
		if (!update)
			continue;

		ether_addr_copy(update->addr, ha->addr);
		update->synced = ha->synced;
		update->refcount = ha->refcount;
		list_add_tail(&update->list, &update_list);
	}
	netif_addr_unlock_bh(ndev);

	/* Process collected addresses outside spinlock */
	list_for_each_entry_safe(update, tmp, &update_list, list) {
		existing_membership = icssg_fdb_lookup(emac,
						       update->addr,
						       vlan_id);
		if (existing_membership < 0) {
			netdev_dbg(ndev,
				   "FDB lookup failed for %pM: %d, skipping\n",
				   update->addr, existing_membership);
			list_del(&update->list);
			kfree(update);
			continue;
		}

		port_membership = existing_membership;
		if (update->synced) {
			port_membership |=
				ICSSG_FDB_ENTRY_P0_MEMBERSHIP;
			if (update->refcount >= 3)
				port_membership |= BIT(emac->port_id);
			else
				port_membership &= ~BIT(emac->port_id);
		} else if (existing_membership &
			   ICSSG_FDB_ENTRY_P0_MEMBERSHIP) {
			port_membership &=
				~ICSSG_FDB_ENTRY_P0_MEMBERSHIP;
		}

		if (existing_membership != port_membership) {
			netdev_dbg(ndev, "Update %pM: 0x%x -> 0x%x\n",
				   update->addr, existing_membership,
				   port_membership);

			icssg_hsr_fdb_update(emac, update->addr,
					     vlan_id, port_membership,
					     true);
		}

		list_del(&update->list);
		kfree(update);
	}
}

static void emac_ndo_set_rx_mode_work(struct work_struct *work)
{
	struct prueth_emac *emac = container_of(work, struct prueth_emac, rx_mode_work);
	struct net_device *ndev = emac->ndev;
	bool promisc, allmulti;

	if (!netif_running(ndev))
		return;

	promisc = ndev->flags & IFF_PROMISC;
	allmulti = ndev->flags & IFF_ALLMULTI;
	icssg_set_port_state(emac, ICSSG_EMAC_PORT_UC_FLOODING_DISABLE);
	icssg_set_port_state(emac, ICSSG_EMAC_PORT_MC_FLOODING_DISABLE);

	if (promisc) {
		icssg_set_port_state(emac, ICSSG_EMAC_PORT_UC_FLOODING_ENABLE);
		icssg_set_port_state(emac, ICSSG_EMAC_PORT_MC_FLOODING_ENABLE);
		return;
	}

	if (allmulti) {
		icssg_set_port_state(emac, ICSSG_EMAC_PORT_MC_FLOODING_ENABLE);
		return;
	}

	if (emac->prueth->is_hsr_offload_mode) {
		/* Track basic add/delete via callbacks */
		__dev_mc_sync(ndev, icssg_prueth_hsr_add_mcast,
			      icssg_prueth_hsr_del_mcast);

		/* Handle overlapping memberships */
		icssg_hsr_handle_multicast_sync(emac);

		if (rtnl_trylock()) {
			vlan_for_each(emac->prueth->hsr_dev,
				      icssg_update_vlan_mcast, emac);
			rtnl_unlock();
		}
	} else {
		__dev_mc_sync(ndev, icssg_prueth_add_mcast,
			      icssg_prueth_del_mcast);
		if (rtnl_trylock()) {
			vlan_for_each(ndev, icssg_update_vlan_mcast, emac);
			rtnl_unlock();
		}
	}
}

/**
 * emac_ndo_set_rx_mode - EMAC set receive mode function
 * @ndev: The EMAC network adapter
 *
 * Called when system wants to set the receive mode of the device.
 *
 */
static void emac_ndo_set_rx_mode(struct net_device *ndev)
{
	struct prueth_emac *emac = netdev_priv(ndev);

	schedule_work(&emac->rx_mode_work);
}

static netdev_features_t emac_ndo_fix_features(struct net_device *ndev,
					       netdev_features_t features)
{
	/* hsr tag insertion offload and hsr dup offload are tightly coupled in
	 * firmware implementation. Both these features need to be enabled /
	 * disabled together.
	 */
	if (!(ndev->features & (NETIF_F_HW_HSR_DUP | NETIF_F_HW_HSR_TAG_INS)))
		if ((features & NETIF_F_HW_HSR_DUP) ||
		    (features & NETIF_F_HW_HSR_TAG_INS))
			features |= NETIF_F_HW_HSR_DUP |
				    NETIF_F_HW_HSR_TAG_INS;

	if ((ndev->features & NETIF_F_HW_HSR_DUP) ||
	    (ndev->features & NETIF_F_HW_HSR_TAG_INS))
		if (!(features & NETIF_F_HW_HSR_DUP) ||
		    !(features & NETIF_F_HW_HSR_TAG_INS))
			features &= ~(NETIF_F_HW_HSR_DUP |
				      NETIF_F_HW_HSR_TAG_INS);

	return features;
}

static int emac_ndo_vlan_rx_add_vid(struct net_device *ndev,
				    __be16 proto, u16 vid)
{
	struct prueth_emac *emac = netdev_priv(ndev);
	struct prueth *prueth = emac->prueth;
	int port_mask = BIT(emac->port_id);
	int untag_mask = 0;

	if (prueth->is_hsr_offload_mode)
		port_mask |= BIT(PRUETH_PORT_HOST);

	__hw_addr_init(&emac->vlan_mcast_list[vid]);
	netdev_dbg(emac->ndev, "VID add vid:%u port_mask:%X untag_mask %X\n",
		   vid, port_mask, untag_mask);

	icssg_vtbl_modify(emac, vid, port_mask, untag_mask, true);
	icssg_set_pvid(emac->prueth, vid, emac->port_id);

	return 0;
}

static int emac_ndo_vlan_rx_del_vid(struct net_device *ndev,
				    __be16 proto, u16 vid)
{
	struct prueth_emac *emac = netdev_priv(ndev);
	struct prueth *prueth = emac->prueth;
	int port_mask = BIT(emac->port_id);
	int untag_mask = 0;

	if (prueth->is_hsr_offload_mode)
		port_mask = BIT(PRUETH_PORT_HOST);

	netdev_dbg(emac->ndev, "VID del vid:%u port_mask:%X untag_mask  %X\n",
		   vid, port_mask, untag_mask);
	icssg_vtbl_modify(emac, vid, port_mask, untag_mask, false);

	return 0;
}

/**
 * emac_xdp_xmit - Implements ndo_xdp_xmit
 * @dev: netdev
 * @n: number of frames
 * @frames: array of XDP buffer pointers
 * @flags: XDP extra info
 *
 * Return: number of frames successfully sent. Failed frames
 * will be free'ed by XDP core.
 *
 * For error cases, a negative errno code is returned and no-frames
 * are transmitted (caller must handle freeing frames).
 **/
static int emac_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
			 u32 flags)
{
	struct prueth_emac *emac = netdev_priv(dev);
	struct net_device *ndev = emac->ndev;
	struct netdev_queue *netif_txq;
	int cpu = smp_processor_id();
	struct xdp_frame *xdpf;
	unsigned int q_idx;
	int nxmit = 0;
	u32 err;
	int i;

	q_idx = cpu % emac->tx_ch_num;
	netif_txq = netdev_get_tx_queue(ndev, q_idx);

	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
		return -EINVAL;

	__netif_tx_lock(netif_txq, cpu);
	for (i = 0; i < n; i++) {
		xdpf = frames[i];
		err = emac_xmit_xdp_frame(emac, xdpf, q_idx,
					  PRUETH_TX_BUFF_TYPE_XDP_NDO);
		if (err != ICSSG_XDP_TX) {
			ndev->stats.tx_dropped++;
			break;
		}
		nxmit++;
	}
	__netif_tx_unlock(netif_txq);

	return nxmit;
}

/**
 * emac_xdp_setup - add/remove an XDP program
 * @emac: emac device
 * @bpf: XDP program
 *
 * Return: Always 0 (Success)
 **/
static int emac_xdp_setup(struct prueth_emac *emac, struct netdev_bpf *bpf)
{
	struct bpf_prog *prog = bpf->prog;

	if (!emac->xdpi.prog && !prog)
		return 0;

	WRITE_ONCE(emac->xdp_prog, prog);

	xdp_attachment_setup(&emac->xdpi, bpf);

	return 0;
}

static int prueth_xsk_pool_enable(struct prueth_emac *emac,
				  struct xsk_buff_pool *pool, u16 queue_id)
{
	struct prueth_rx_chn *rx_chn = &emac->rx_chns;
	u32 frame_size;
	int ret;

	if (queue_id >= PRUETH_MAX_RX_FLOWS ||
	    queue_id >= emac->tx_ch_num) {
		netdev_err(emac->ndev, "Invalid XSK queue ID %d\n", queue_id);
		return -EINVAL;
	}

	frame_size = xsk_pool_get_rx_frame_size(pool);
	if (frame_size < PRUETH_MAX_PKT_SIZE)
		return -EOPNOTSUPP;

	ret = xsk_pool_dma_map(pool, rx_chn->dma_dev, PRUETH_RX_DMA_ATTR);
	if (ret) {
		netdev_err(emac->ndev, "Failed to map XSK pool: %d\n", ret);
		return ret;
	}

	if (netif_running(emac->ndev)) {
		/* stop packets from wire for graceful teardown */
		ret = icssg_set_port_state(emac, ICSSG_EMAC_PORT_DISABLE);
		if (ret)
			return ret;
		prueth_destroy_rxq(emac);
	}

	emac->xsk_qid = queue_id;
	prueth_set_xsk_pool(emac, queue_id);

	if (netif_running(emac->ndev)) {
		ret = prueth_create_rxq(emac);
		if (ret) {
			netdev_err(emac->ndev, "Failed to create RX queue: %d\n", ret);
			return ret;
		}
		ret = icssg_set_port_state(emac, ICSSG_EMAC_PORT_FORWARD);
		if (ret) {
			prueth_destroy_rxq(emac);
			return ret;
		}
		ret = prueth_xsk_wakeup(emac->ndev, queue_id, XDP_WAKEUP_RX);
		if (ret)
			return ret;
	}

	return 0;
}

static int prueth_xsk_pool_disable(struct prueth_emac *emac, u16 queue_id)
{
	struct xsk_buff_pool *pool;
	int ret;

	if (queue_id >= PRUETH_MAX_RX_FLOWS ||
	    queue_id >= emac->tx_ch_num) {
		netdev_err(emac->ndev, "Invalid XSK queue ID %d\n", queue_id);
		return -EINVAL;
	}

	if (emac->xsk_qid != queue_id) {
		netdev_err(emac->ndev, "XSK queue ID %d not registered\n", queue_id);
		return -EINVAL;
	}

	pool = xsk_get_pool_from_qid(emac->ndev, queue_id);
	if (!pool) {
		netdev_err(emac->ndev, "No XSK pool registered for queue %d\n", queue_id);
		return -EINVAL;
	}

	if (netif_running(emac->ndev)) {
		/* stop packets from wire for graceful teardown */
		ret = icssg_set_port_state(emac, ICSSG_EMAC_PORT_DISABLE);
		if (ret)
			return ret;
		prueth_destroy_rxq(emac);
	}

	xsk_pool_dma_unmap(pool, PRUETH_RX_DMA_ATTR);
	emac->xsk_qid = -EINVAL;
	prueth_set_xsk_pool(emac, queue_id);

	if (netif_running(emac->ndev)) {
		ret = prueth_create_rxq(emac);
		if (ret) {
			netdev_err(emac->ndev, "Failed to create RX queue: %d\n", ret);
			return ret;
		}
		ret = icssg_set_port_state(emac, ICSSG_EMAC_PORT_FORWARD);
		if (ret) {
			prueth_destroy_rxq(emac);
			return ret;
		}
	}

	return 0;
}

/**
 * emac_ndo_bpf - implements ndo_bpf for icssg_prueth
 * @ndev: network adapter device
 * @bpf: XDP program
 *
 * Return: 0 on success, error code on failure.
 **/
static int emac_ndo_bpf(struct net_device *ndev, struct netdev_bpf *bpf)
{
	struct prueth_emac *emac = netdev_priv(ndev);

	switch (bpf->command) {
	case XDP_SETUP_PROG:
		return emac_xdp_setup(emac, bpf);
	case XDP_SETUP_XSK_POOL:
		return bpf->xsk.pool ?
			prueth_xsk_pool_enable(emac, bpf->xsk.pool, bpf->xsk.queue_id) :
			prueth_xsk_pool_disable(emac, bpf->xsk.queue_id);
	default:
		return -EINVAL;
	}
}

int prueth_xsk_wakeup(struct net_device *ndev, u32 qid, u32 flags)
{
	struct prueth_emac *emac = netdev_priv(ndev);
	struct prueth_tx_chn *tx_chn = &emac->tx_chns[qid];
	struct prueth_rx_chn *rx_chn = &emac->rx_chns;

	if (emac->xsk_qid != qid) {
		netdev_err(ndev, "XSK queue %d not registered\n", qid);
		return -EINVAL;
	}

	if (qid >= PRUETH_MAX_RX_FLOWS || qid >= emac->tx_ch_num) {
		netdev_err(ndev, "Invalid XSK queue ID %d\n", qid);
		return -EINVAL;
	}

	if (!tx_chn->xsk_pool) {
		netdev_err(ndev, "XSK pool not registered for queue %d\n", qid);
		return -EINVAL;
	}

	if (!rx_chn->xsk_pool) {
		netdev_err(ndev, "XSK pool not registered for RX queue %d\n", qid);
		return -EINVAL;
	}

	if (flags & XDP_WAKEUP_TX) {
		if (!napi_if_scheduled_mark_missed(&tx_chn->napi_tx)) {
			if (likely(napi_schedule_prep(&tx_chn->napi_tx)))
				__napi_schedule(&tx_chn->napi_tx);
		}
	}

	if (flags & XDP_WAKEUP_RX) {
		if (!napi_if_scheduled_mark_missed(&emac->napi_rx)) {
			if (likely(napi_schedule_prep(&emac->napi_rx)))
				__napi_schedule(&emac->napi_rx);
		}
	}

	return 0;
}

static const struct net_device_ops emac_netdev_ops = {
	.ndo_open = emac_ndo_open,
	.ndo_stop = emac_ndo_stop,
	.ndo_start_xmit = icssg_ndo_start_xmit,
	.ndo_set_mac_address = eth_mac_addr,
	.ndo_validate_addr = eth_validate_addr,
	.ndo_tx_timeout = icssg_ndo_tx_timeout,
	.ndo_set_rx_mode = emac_ndo_set_rx_mode,
	.ndo_eth_ioctl = phy_do_ioctl,
	.ndo_get_stats64 = icssg_ndo_get_stats64,
	.ndo_get_phys_port_name = icssg_ndo_get_phys_port_name,
	.ndo_fix_features = emac_ndo_fix_features,
	.ndo_vlan_rx_add_vid = emac_ndo_vlan_rx_add_vid,
	.ndo_vlan_rx_kill_vid = emac_ndo_vlan_rx_del_vid,
	.ndo_bpf = emac_ndo_bpf,
	.ndo_xdp_xmit = emac_xdp_xmit,
	.ndo_hwtstamp_get = icssg_ndo_get_ts_config,
	.ndo_hwtstamp_set = icssg_ndo_set_ts_config,
	.ndo_xsk_wakeup = prueth_xsk_wakeup,
};

static int prueth_netdev_init(struct prueth *prueth,
			      struct device_node *eth_node)
{
	int ret, num_tx_chn = PRUETH_MAX_TX_QUEUES;
	struct prueth_emac *emac;
	struct net_device *ndev;
	enum prueth_port port;
	const char *irq_name;
	enum prueth_mac mac;

	port = prueth_node_port(eth_node);
	if (port == PRUETH_PORT_INVALID)
		return -EINVAL;

	mac = prueth_node_mac(eth_node);
	if (mac == PRUETH_MAC_INVALID)
		return -EINVAL;

	ndev = alloc_etherdev_mq(sizeof(*emac), num_tx_chn);
	if (!ndev)
		return -ENOMEM;

	emac = netdev_priv(ndev);
	emac->prueth = prueth;
	emac->ndev = ndev;
	emac->port_id = port;
	emac->xdp_prog = NULL;
	emac->ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
	INIT_WORK(&emac->rx_mode_work, emac_ndo_set_rx_mode_work);

	INIT_DELAYED_WORK(&emac->stats_work, icssg_stats_work_handler);

	ret = pruss_request_mem_region(prueth->pruss,
				       port == PRUETH_PORT_MII0 ?
				       PRUSS_MEM_DRAM0 : PRUSS_MEM_DRAM1,
				       &emac->dram);
	if (ret) {
		dev_err(prueth->dev, "unable to get DRAM: %d\n", ret);
		ret = -ENOMEM;
		goto free_ndev;
	}

	emac->tx_ch_num = 1;

	irq_name = "tx_ts0";
	if (emac->port_id == PRUETH_PORT_MII1)
		irq_name = "tx_ts1";
	emac->tx_ts_irq = platform_get_irq_byname_optional(prueth->pdev, irq_name);
	if (emac->tx_ts_irq < 0) {
		ret = dev_err_probe(prueth->dev, emac->tx_ts_irq, "could not get tx_ts_irq\n");
		goto free;
	}

	SET_NETDEV_DEV(ndev, prueth->dev);
	spin_lock_init(&emac->lock);
	mutex_init(&emac->cmd_lock);

	emac->phy_node = of_parse_phandle(eth_node, "phy-handle", 0);
	if (!emac->phy_node && !of_phy_is_fixed_link(eth_node)) {
		dev_err(prueth->dev, "couldn't find phy-handle\n");
		ret = -ENODEV;
		goto free;
	} else if (of_phy_is_fixed_link(eth_node)) {
		ret = of_phy_register_fixed_link(eth_node);
		if (ret) {
			dev_err_probe(prueth->dev, ret, "failed to register fixed-link phy\n");
			goto free;
		}

		emac->phy_node = eth_node;
	}

	ret = of_get_phy_mode(eth_node, &emac->phy_if);
	if (ret) {
		dev_err(prueth->dev, "could not get phy-mode property\n");
		goto free;
	}

	if (emac->phy_if != PHY_INTERFACE_MODE_MII &&
	    !phy_interface_mode_is_rgmii(emac->phy_if)) {
		dev_err(prueth->dev, "PHY mode unsupported %s\n", phy_modes(emac->phy_if));
		ret = -EINVAL;
		goto free;
	}

	/* AM65 SR2.0 has TX Internal delay always enabled by hardware
	 * and it is not possible to disable TX Internal delay. The below
	 * switch case block describes how we handle different phy modes
	 * based on hardware restriction.
	 */
	switch (emac->phy_if) {
	case PHY_INTERFACE_MODE_RGMII_ID:
		emac->phy_if = PHY_INTERFACE_MODE_RGMII_RXID;
		break;
	case PHY_INTERFACE_MODE_RGMII_TXID:
		emac->phy_if = PHY_INTERFACE_MODE_RGMII;
		break;
	case PHY_INTERFACE_MODE_RGMII:
	case PHY_INTERFACE_MODE_RGMII_RXID:
		dev_err(prueth->dev, "RGMII mode without TX delay is not supported");
		ret = -EINVAL;
		goto free;
	default:
		break;
	}

	/* get mac address from DT and set private and netdev addr */
	ret = of_get_ethdev_address(eth_node, ndev);
	if (!is_valid_ether_addr(ndev->dev_addr)) {
		eth_hw_addr_random(ndev);
		dev_warn(prueth->dev, "port %d: using random MAC addr: %pM\n",
			 port, ndev->dev_addr);
	}
	ether_addr_copy(emac->mac_addr, ndev->dev_addr);

	ndev->dev.of_node = eth_node;
	ndev->min_mtu = PRUETH_MIN_PKT_SIZE;
	ndev->max_mtu = PRUETH_MAX_MTU;
	ndev->netdev_ops = &emac_netdev_ops;
	ndev->ethtool_ops = &icssg_ethtool_ops;
	ndev->hw_features = NETIF_F_SG;
	ndev->features = ndev->hw_features | NETIF_F_HW_VLAN_CTAG_FILTER;
	ndev->hw_features |= NETIF_PRUETH_HSR_OFFLOAD_FEATURES;
	xdp_set_features_flag(ndev,
			      NETDEV_XDP_ACT_BASIC |
			      NETDEV_XDP_ACT_REDIRECT |
			      NETDEV_XDP_ACT_NDO_XMIT |
			      NETDEV_XDP_ACT_XSK_ZEROCOPY);

	netif_napi_add(ndev, &emac->napi_rx, icssg_napi_rx_poll);
	hrtimer_setup(&emac->rx_hrtimer, &emac_rx_timer_callback, CLOCK_MONOTONIC,
		      HRTIMER_MODE_REL_PINNED);
	prueth->emac[mac] = emac;

	return 0;

free:
	pruss_release_mem_region(prueth->pruss, &emac->dram);
free_ndev:
	emac->ndev = NULL;
	prueth->emac[mac] = NULL;
	free_netdev(ndev);

	return ret;
}

bool prueth_dev_check(const struct net_device *ndev)
{
	if (ndev->netdev_ops == &emac_netdev_ops && netif_running(ndev)) {
		struct prueth_emac *emac = netdev_priv(ndev);

		return emac->prueth->is_switch_mode;
	}

	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 int prueth_emac_restart(struct prueth *prueth)
{
	struct prueth_emac *emac0 = prueth->emac[PRUETH_MAC0];
	struct prueth_emac *emac1 = prueth->emac[PRUETH_MAC1];
	int ret;

	/* 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 */
	ret = icssg_set_port_state(emac0, ICSSG_EMAC_PORT_DISABLE);
	ret |= icssg_set_port_state(emac1, ICSSG_EMAC_PORT_DISABLE);
	if (ret)
		return ret;

	/* Stop both pru cores for both PRUeth ports*/
	ret = prueth_emac_common_stop(prueth);
	if (ret) {
		dev_err(prueth->dev, "Failed to stop the firmwares");
		return ret;
	}

	/* Start both pru cores for both PRUeth ports */
	ret = prueth_emac_common_start(prueth);
	if (ret) {
		dev_err(prueth->dev, "Failed to start the firmwares");
		return ret;
	}

	/* Enable forwarding for both PRUeth ports */
	ret = icssg_set_port_state(emac0, ICSSG_EMAC_PORT_FORWARD);
	ret |= icssg_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);

	return ret;
}

static void icssg_change_mode(struct prueth *prueth)
{
	int ret;

	ret = prueth_emac_restart(prueth);
	if (ret) {
		dev_err(prueth->dev, "Failed to restart the firmwares, aborting the process");
		return;
	}

	icssg_enable_fw_offload(prueth);
}

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 = PRUETH_DFLT_VLAN_SW;
			emac->port_vlan = prueth->default_vlan;
			icssg_change_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;
	int ret;

	prueth->br_members &= ~BIT(emac->port_id);

	if (prueth->is_switch_mode) {
		prueth->is_switch_mode = false;
		emac->port_vlan = 0;
		ret = prueth_emac_restart(prueth);
		if (ret) {
			dev_err(prueth->dev, "Failed to restart the firmwares, aborting the process");
			return;
		}
	}

	prueth_offload_fwd_mark_update(prueth);

	if (!prueth->br_members)
		prueth->hw_bridge_dev = NULL;
}

static int prueth_hsr_port_link(struct net_device *ndev)
{
	struct prueth_emac *emac = netdev_priv(ndev);
	struct prueth *prueth = emac->prueth;
	struct prueth_emac *emac0;
	struct prueth_emac *emac1;

	emac0 = prueth->emac[PRUETH_MAC0];
	emac1 = prueth->emac[PRUETH_MAC1];

	if (prueth->is_switch_mode)
		return -EOPNOTSUPP;

	prueth->hsr_members |= BIT(emac->port_id);
	if (!prueth->is_hsr_offload_mode) {
		if (prueth->hsr_members & BIT(PRUETH_PORT_MII0) &&
		    prueth->hsr_members & BIT(PRUETH_PORT_MII1)) {
			if (!(emac0->ndev->features &
			      NETIF_PRUETH_HSR_OFFLOAD_FEATURES) &&
			    !(emac1->ndev->features &
			      NETIF_PRUETH_HSR_OFFLOAD_FEATURES))
				return -EOPNOTSUPP;
			prueth->is_hsr_offload_mode = true;
			prueth->default_vlan = PRUETH_DFLT_VLAN_HSR;
			emac0->port_vlan = prueth->default_vlan;
			emac1->port_vlan = prueth->default_vlan;
			icssg_change_mode(prueth);
			netdev_dbg(ndev, "Enabling HSR offload mode\n");
		}
	}

	return 0;
}

static void prueth_hsr_port_unlink(struct net_device *ndev)
{
	struct prueth_emac *emac = netdev_priv(ndev);
	struct prueth *prueth = emac->prueth;
	struct prueth_emac *emac0;
	struct prueth_emac *emac1;
	int ret;

	emac0 = prueth->emac[PRUETH_MAC0];
	emac1 = prueth->emac[PRUETH_MAC1];

	prueth->hsr_members &= ~BIT(emac->port_id);
	if (prueth->is_hsr_offload_mode) {
		prueth->is_hsr_offload_mode = false;
		emac0->port_vlan = 0;
		emac1->port_vlan = 0;
		prueth->hsr_dev = NULL;
		ret = prueth_emac_restart(prueth);
		if (ret) {
			dev_err(prueth->dev, "Failed to restart the firmwares, aborting the process");
			return;
		}
		netdev_dbg(ndev, "Disabling HSR Offload mode\n");
	}
}

/* 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;
	struct prueth_emac *emac = netdev_priv(ndev);
	struct prueth *prueth = emac->prueth;
	enum hsr_version hsr_ndev_version;
	int ret = NOTIFY_DONE;

	if (ndev->netdev_ops != &emac_netdev_ops)
		return NOTIFY_DONE;

	switch (event) {
	case NETDEV_CHANGEUPPER:
		info = ptr;

		if ((ndev->features & NETIF_PRUETH_HSR_OFFLOAD_FEATURES) &&
		    is_hsr_master(info->upper_dev)) {
			hsr_get_version(info->upper_dev, &hsr_ndev_version);
			if (hsr_ndev_version != HSR_V1 && hsr_ndev_version != PRP_V1)
				return -EOPNOTSUPP;
			prueth->hsr_prp_version = hsr_ndev_version;

			if (info->linking) {
				if (!prueth->hsr_dev) {
					prueth->hsr_dev = info->upper_dev;
					icssg_class_set_host_mac_addr(prueth->miig_rt,
								      prueth->hsr_dev->dev_addr);
				} else {
					if (prueth->hsr_dev != info->upper_dev) {
						netdev_dbg(ndev, "Both interfaces must be linked to same upper device\n");
						return -EOPNOTSUPP;
					}
				}
				prueth_hsr_port_link(ndev);
			} else {
				prueth_hsr_port_unlink(ndev);
			}
		}

		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 void icssg_read_firmware_names(struct device_node *np,
				      struct icssg_firmwares *fw)
{
	int i;

	for (i = 0; i < PRUETH_NUM_MACS; i++) {
		of_property_read_string_index(np, "firmware-name", i * 3 + 0,
					      &fw[i].pru);
		of_property_read_string_index(np, "firmware-name", i * 3 + 1,
					      &fw[i].rtu);
		of_property_read_string_index(np, "firmware-name", i * 3 + 2,
					      &fw[i].txpru);
	}
}

/* icssg_firmware_name_replace - Replace a substring in firmware name
 * @dev: device pointer for memory allocation
 * @src: source firmware name string
 * @from: substring to replace
 * @to: replacement substring
 *
 * Return: a newly allocated string with the replacement, or the original
 * string if replacement is not possible.
 */
static const char *icssg_firmware_name_replace(struct device *dev,
					       const char *src,
					       const char *from,
					       const char *to)
{
	size_t prefix, from_len, to_len, total;
	const char *p = strstr(src, from);
	char *buf;

	if (!p)
		return src; /* fallback: no replacement, use original */

	prefix = p - src;
	from_len = strlen(from);
	to_len = strlen(to);
	total = strlen(src) - from_len + to_len + 1;

	buf = devm_kzalloc(dev, total, GFP_KERNEL);
	if (!buf)
		return src; /* fallback: allocation failed, use original */

	strscpy(buf, src, prefix + 1);
	strscpy(buf + prefix, to, to_len + 1);
	strscpy(buf + prefix + to_len, p + from_len, total - prefix - to_len);

	return buf;
}

/**
 * icssg_mode_firmware_names - Generate firmware names for a specific mode
 * @dev: device pointer for logging and context
 * @src: source array of firmware name structures
 * @dst: destination array to store updated firmware name structures
 * @from: substring in firmware names to be replaced
 * @to: substring to replace @from in firmware names
 *
 * Iterates over all MACs and replaces occurrences of the @from substring
 * with @to in the firmware names (pru, rtu, txpru) for each MAC. The
 * updated firmware names are stored in the @dst array.
 */
static void icssg_mode_firmware_names(struct device *dev,
				      struct icssg_firmwares *src,
				      struct icssg_firmwares *dst,
				      const char *from, const char *to)
{
	int i;

	for (i = 0; i < PRUETH_NUM_MACS; i++) {
		dst[i].pru = icssg_firmware_name_replace(dev, src[i].pru,
							 from, to);
		dst[i].rtu = icssg_firmware_name_replace(dev, src[i].rtu,
							 from, to);
		dst[i].txpru = icssg_firmware_name_replace(dev, src[i].txpru,
							   from, to);
	}
}

static int prueth_probe(struct platform_device *pdev)
{
	struct device_node *eth_node, *eth_ports_node;
	struct device_node  *eth0_node = NULL;
	struct device_node  *eth1_node = NULL;
	struct genpool_data_align gp_data = {
		.align = SZ_64K,
	};
	struct device *dev = &pdev->dev;
	struct device_node *np;
	struct prueth *prueth;
	struct pruss *pruss;
	u32 msmc_ram_size;
	int i, ret;

	np = dev->of_node;

	BUILD_BUG_ON_MSG((sizeof(struct prueth_swdata) > PRUETH_NAV_SW_DATA_SIZE),
			 "insufficient SW_DATA size");

	prueth = devm_kzalloc(dev, sizeof(*prueth), GFP_KERNEL);
	if (!prueth)
		return -ENOMEM;

	dev_set_drvdata(dev, prueth);
	prueth->pdev = pdev;
	prueth->pdata = *(const struct prueth_pdata *)device_get_match_data(dev);

	prueth->dev = dev;
	eth_ports_node = of_get_child_by_name(np, "ethernet-ports");
	if (!eth_ports_node)
		return -ENOENT;

	for_each_child_of_node(eth_ports_node, eth_node) {
		u32 reg;

		if (strcmp(eth_node->name, "port"))
			continue;
		ret = of_property_read_u32(eth_node, "reg", &reg);
		if (ret < 0) {
			dev_err(dev, "%pOF error reading port_id %d\n",
				eth_node, ret);
		}

		of_node_get(eth_node);

		if (reg == 0) {
			eth0_node = eth_node;
			if (!of_device_is_available(eth0_node)) {
				of_node_put(eth0_node);
				eth0_node = NULL;
			}
		} else if (reg == 1) {
			eth1_node = eth_node;
			if (!of_device_is_available(eth1_node)) {
				of_node_put(eth1_node);
				eth1_node = NULL;
			}
		} else {
			dev_err(dev, "port reg should be 0 or 1\n");
		}
	}

	of_node_put(eth_ports_node);

	/* At least one node must be present and available else we fail */
	if (!eth0_node && !eth1_node) {
		dev_err(dev, "neither port0 nor port1 node available\n");
		return -ENODEV;
	}

	if (eth0_node == eth1_node) {
		dev_err(dev, "port0 and port1 can't have same reg\n");
		of_node_put(eth0_node);
		return -ENODEV;
	}

	prueth->eth_node[PRUETH_MAC0] = eth0_node;
	prueth->eth_node[PRUETH_MAC1] = eth1_node;

	prueth->miig_rt = syscon_regmap_lookup_by_phandle(np, "ti,mii-g-rt");
	if (IS_ERR(prueth->miig_rt)) {
		dev_err(dev, "couldn't get ti,mii-g-rt syscon regmap\n");
		return -ENODEV;
	}

	prueth->mii_rt = syscon_regmap_lookup_by_phandle(np, "ti,mii-rt");
	if (IS_ERR(prueth->mii_rt)) {
		dev_err(dev, "couldn't get ti,mii-rt syscon regmap\n");
		return -ENODEV;
	}

	prueth->pa_stats = syscon_regmap_lookup_by_phandle(np, "ti,pa-stats");
	if (IS_ERR(prueth->pa_stats)) {
		dev_err(dev, "couldn't get ti,pa-stats syscon regmap\n");
		prueth->pa_stats = NULL;
	}

	if (eth0_node || eth1_node) {
		ret = prueth_get_cores(prueth, ICSS_SLICE0, false);
		if (ret)
			goto put_cores;
		ret = prueth_get_cores(prueth, ICSS_SLICE1, false);
		if (ret)
			goto put_cores;
	}

	pruss = pruss_get(eth0_node ?
			  prueth->pru[ICSS_SLICE0] : prueth->pru[ICSS_SLICE1]);
	if (IS_ERR(pruss)) {
		ret = PTR_ERR(pruss);
		dev_err(dev, "unable to get pruss handle\n");
		goto put_cores;
	}

	prueth->pruss = pruss;

	ret = pruss_request_mem_region(pruss, PRUSS_MEM_SHRD_RAM2,
				       &prueth->shram);
	if (ret) {
		dev_err(dev, "unable to get PRUSS SHRD RAM2: %d\n", ret);
		goto put_pruss;
	}

	prueth->sram_pool = of_gen_pool_get(np, "sram", 0);
	if (!prueth->sram_pool) {
		dev_err(dev, "unable to get SRAM pool\n");
		ret = -ENODEV;

		goto put_mem;
	}

	prueth->is_switchmode_supported = prueth->pdata.switch_mode;
	if (prueth->pdata.banked_ms_ram) {
		/* Reserve 2 MSMC RAM banks for buffers to avoid arbitration */
		msmc_ram_size = (2 * MSMC_RAM_BANK_SIZE);
	} else {
		msmc_ram_size = PRUETH_EMAC_TOTAL_BUF_SIZE;
		if (prueth->is_switchmode_supported)
			msmc_ram_size = PRUETH_SW_TOTAL_BUF_SIZE;
	}

	/* NOTE: FW bug needs buffer base to be 64KB aligned */
	prueth->msmcram.va =
		(void __iomem *)gen_pool_alloc_algo(prueth->sram_pool,
						    msmc_ram_size,
						    gen_pool_first_fit_align,
						    &gp_data);

	if (!prueth->msmcram.va) {
		ret = -ENOMEM;
		dev_err(dev, "unable to allocate MSMC resource\n");
		goto put_mem;
	}
	prueth->msmcram.pa = gen_pool_virt_to_phys(prueth->sram_pool,
						   (unsigned long)prueth->msmcram.va);
	prueth->msmcram.size = msmc_ram_size;
	memset_io(prueth->msmcram.va, 0, msmc_ram_size);
	dev_dbg(dev, "sram: pa %llx va %p size %zx\n", prueth->msmcram.pa,
		prueth->msmcram.va, prueth->msmcram.size);

	prueth->iep0 = icss_iep_get_idx(np, 0);
	if (IS_ERR(prueth->iep0)) {
		ret = dev_err_probe(dev, PTR_ERR(prueth->iep0), "iep0 get failed\n");
		prueth->iep0 = NULL;
		goto free_pool;
	}

	prueth->iep1 = icss_iep_get_idx(np, 1);
	if (IS_ERR(prueth->iep1)) {
		ret = dev_err_probe(dev, PTR_ERR(prueth->iep1), "iep1 get failed\n");
		goto put_iep0;
	}

	if (prueth->pdata.quirk_10m_link_issue) {
		/* Enable IEP1 for FW in 64bit mode as W/A for 10M FD link detect issue under TX
		 * traffic.
		 */
		icss_iep_init_fw(prueth->iep1);
	}

	/* Read EMAC firmware names from device tree */
	icssg_read_firmware_names(np, prueth->icssg_emac_firmwares);

	/* Generate other mode firmware names based on EMAC firmware names */
	icssg_mode_firmware_names(dev, prueth->icssg_emac_firmwares,
				  prueth->icssg_switch_firmwares, "eth", "sw");
	icssg_mode_firmware_names(dev, prueth->icssg_emac_firmwares,
				  prueth->icssg_hsr_firmwares, "eth", "hsr");
	icssg_mode_firmware_names(dev, prueth->icssg_emac_firmwares,
				  prueth->icssg_prp_firmwares, "eth", "prp");

	spin_lock_init(&prueth->vtbl_lock);
	spin_lock_init(&prueth->stats_lock);
	/* setup netdev interfaces */
	if (eth0_node) {
		ret = prueth_netdev_init(prueth, eth0_node);
		if (ret) {
			dev_err_probe(dev, ret, "netdev init %s failed\n",
				      eth0_node->name);
			goto exit_iep;
		}

		prueth->emac[PRUETH_MAC0]->half_duplex =
			of_property_read_bool(eth0_node, "ti,half-duplex-capable");

		prueth->emac[PRUETH_MAC0]->iep = prueth->iep0;
	}

	if (eth1_node) {
		ret = prueth_netdev_init(prueth, eth1_node);
		if (ret) {
			dev_err_probe(dev, ret, "netdev init %s failed\n",
				      eth1_node->name);
			goto netdev_exit;
		}

		prueth->emac[PRUETH_MAC1]->half_duplex =
			of_property_read_bool(eth1_node, "ti,half-duplex-capable");

		prueth->emac[PRUETH_MAC1]->iep = prueth->iep0;
	}

	/* register the network devices */
	if (eth0_node) {
		ret = register_netdev(prueth->emac[PRUETH_MAC0]->ndev);
		if (ret) {
			dev_err(dev, "can't register netdev for port MII0");
			goto netdev_exit;
		}

		prueth->registered_netdevs[PRUETH_MAC0] = prueth->emac[PRUETH_MAC0]->ndev;

		ret = emac_phy_connect(prueth->emac[PRUETH_MAC0]);
		if (ret) {
			dev_err(dev,
				"can't connect to MII0 PHY, error -%d", ret);
			goto netdev_unregister;
		}
		phy_attached_info(prueth->emac[PRUETH_MAC0]->ndev->phydev);
	}

	if (eth1_node) {
		ret = register_netdev(prueth->emac[PRUETH_MAC1]->ndev);
		if (ret) {
			dev_err(dev, "can't register netdev for port MII1");
			goto netdev_unregister;
		}

		prueth->registered_netdevs[PRUETH_MAC1] = prueth->emac[PRUETH_MAC1]->ndev;
		ret = emac_phy_connect(prueth->emac[PRUETH_MAC1]);
		if (ret) {
			dev_err(dev,
				"can't connect to MII1 PHY, error %d", ret);
			goto netdev_unregister;
		}
		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");

	if (eth1_node)
		of_node_put(eth1_node);
	if (eth0_node)
		of_node_put(eth0_node);
	return 0;

netdev_unregister:
	for (i = 0; i < PRUETH_NUM_MACS; i++) {
		if (!prueth->registered_netdevs[i])
			continue;
		if (prueth->emac[i]->ndev->phydev) {
			phy_disconnect(prueth->emac[i]->ndev->phydev);
			prueth->emac[i]->ndev->phydev = NULL;
		}
		unregister_netdev(prueth->registered_netdevs[i]);
		disable_work_sync(&prueth->emac[i]->rx_mode_work);
	}

netdev_exit:
	for (i = 0; i < PRUETH_NUM_MACS; i++) {
		eth_node = prueth->eth_node[i];
		if (!eth_node)
			continue;

		prueth_netdev_exit(prueth, eth_node);
	}

exit_iep:
	if (prueth->pdata.quirk_10m_link_issue)
		icss_iep_exit_fw(prueth->iep1);
	icss_iep_put(prueth->iep1);

put_iep0:
	icss_iep_put(prueth->iep0);
	prueth->iep0 = NULL;
	prueth->iep1 = NULL;

free_pool:
	gen_pool_free(prueth->sram_pool,
		      (unsigned long)prueth->msmcram.va,
		      prueth->msmcram.size);

put_mem:
	pruss_release_mem_region(prueth->pruss, &prueth->shram);

put_pruss:
	pruss_put(prueth->pruss);

put_cores:
	if (eth0_node || eth1_node) {
		prueth_put_cores(prueth, ICSS_SLICE0);
		of_node_put(eth0_node);

		prueth_put_cores(prueth, ICSS_SLICE1);
		of_node_put(eth1_node);
	}

	return ret;
}

static void prueth_remove(struct platform_device *pdev)
{
	struct prueth *prueth = platform_get_drvdata(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;
		phy_stop(prueth->emac[i]->ndev->phydev);
		phy_disconnect(prueth->emac[i]->ndev->phydev);
		prueth->emac[i]->ndev->phydev = NULL;
		unregister_netdev(prueth->registered_netdevs[i]);
		disable_work_sync(&prueth->emac[i]->rx_mode_work);
	}

	for (i = 0; i < PRUETH_NUM_MACS; i++) {
		eth_node = prueth->eth_node[i];
		if (!eth_node)
			continue;

		prueth_netdev_exit(prueth, eth_node);
	}

	if (prueth->pdata.quirk_10m_link_issue)
		icss_iep_exit_fw(prueth->iep1);

	icss_iep_put(prueth->iep1);
	icss_iep_put(prueth->iep0);

	gen_pool_free(prueth->sram_pool,
		(unsigned long)prueth->msmcram.va,
		prueth->msmcram.size);

	pruss_release_mem_region(prueth->pruss, &prueth->shram);

	pruss_put(prueth->pruss);

	if (prueth->eth_node[PRUETH_MAC1])
		prueth_put_cores(prueth, ICSS_SLICE1);

	if (prueth->eth_node[PRUETH_MAC0])
		prueth_put_cores(prueth, ICSS_SLICE0);
}

static const struct prueth_pdata am654_icssg_pdata = {
	.fdqring_mode = K3_RINGACC_RING_MODE_MESSAGE,
	.quirk_10m_link_issue = 1,
	.switch_mode = 1,
	.banked_ms_ram = 0,
};

static const struct prueth_pdata am64x_icssg_pdata = {
	.fdqring_mode = K3_RINGACC_RING_MODE_RING,
	.quirk_10m_link_issue = 1,
	.switch_mode = 1,
	.banked_ms_ram = 1,
};

static const struct of_device_id prueth_dt_match[] = {
	{ .compatible = "ti,am654-icssg-prueth", .data = &am654_icssg_pdata },
	{ .compatible = "ti,am642-icssg-prueth", .data = &am64x_icssg_pdata },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, prueth_dt_match);

static struct platform_driver prueth_driver = {
	.probe = prueth_probe,
	.remove = prueth_remove,
	.driver = {
		.name = "icssg-prueth",
		.of_match_table = prueth_dt_match,
		.pm = &prueth_dev_pm_ops,
	},
};
module_platform_driver(prueth_driver);

MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
MODULE_AUTHOR("Md Danish Anwar <danishanwar@ti.com>");
MODULE_DESCRIPTION("PRUSS ICSSG Ethernet Driver");
MODULE_LICENSE("GPL");