linux_dsm_epyc7002/drivers/net/ethernet/ti/cpsw_ethtool.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Texas Instruments Ethernet Switch Driver ethtool intf
 *
 * Copyright (C) 2019 Texas Instruments
 */

#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/kmemleak.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/net_tstamp.h>
#include <linux/phy.h>
#include <linux/pm_runtime.h>
#include <linux/skbuff.h>

#include "cpsw.h"
#include "cpts.h"
#include "cpsw_ale.h"
#include "cpsw_priv.h"
#include "davinci_cpdma.h"

struct cpsw_hw_stats {
	u32	rxgoodframes;
	u32	rxbroadcastframes;
	u32	rxmulticastframes;
	u32	rxpauseframes;
	u32	rxcrcerrors;
	u32	rxaligncodeerrors;
	u32	rxoversizedframes;
	u32	rxjabberframes;
	u32	rxundersizedframes;
	u32	rxfragments;
	u32	__pad_0[2];
	u32	rxoctets;
	u32	txgoodframes;
	u32	txbroadcastframes;
	u32	txmulticastframes;
	u32	txpauseframes;
	u32	txdeferredframes;
	u32	txcollisionframes;
	u32	txsinglecollframes;
	u32	txmultcollframes;
	u32	txexcessivecollisions;
	u32	txlatecollisions;
	u32	txunderrun;
	u32	txcarriersenseerrors;
	u32	txoctets;
	u32	octetframes64;
	u32	octetframes65t127;
	u32	octetframes128t255;
	u32	octetframes256t511;
	u32	octetframes512t1023;
	u32	octetframes1024tup;
	u32	netoctets;
	u32	rxsofoverruns;
	u32	rxmofoverruns;
	u32	rxdmaoverruns;
};

struct cpsw_stats {
	char stat_string[ETH_GSTRING_LEN];
	int type;
	int sizeof_stat;
	int stat_offset;
};

enum {
	CPSW_STATS,
	CPDMA_RX_STATS,
	CPDMA_TX_STATS,
};

#define CPSW_STAT(m)		CPSW_STATS,				\
				FIELD_SIZEOF(struct cpsw_hw_stats, m), \
				offsetof(struct cpsw_hw_stats, m)
#define CPDMA_RX_STAT(m)	CPDMA_RX_STATS,				   \
				FIELD_SIZEOF(struct cpdma_chan_stats, m), \
				offsetof(struct cpdma_chan_stats, m)
#define CPDMA_TX_STAT(m)	CPDMA_TX_STATS,				   \
				FIELD_SIZEOF(struct cpdma_chan_stats, m), \
				offsetof(struct cpdma_chan_stats, m)

static const struct cpsw_stats cpsw_gstrings_stats[] = {
	{ "Good Rx Frames", CPSW_STAT(rxgoodframes) },
	{ "Broadcast Rx Frames", CPSW_STAT(rxbroadcastframes) },
	{ "Multicast Rx Frames", CPSW_STAT(rxmulticastframes) },
	{ "Pause Rx Frames", CPSW_STAT(rxpauseframes) },
	{ "Rx CRC Errors", CPSW_STAT(rxcrcerrors) },
	{ "Rx Align/Code Errors", CPSW_STAT(rxaligncodeerrors) },
	{ "Oversize Rx Frames", CPSW_STAT(rxoversizedframes) },
	{ "Rx Jabbers", CPSW_STAT(rxjabberframes) },
	{ "Undersize (Short) Rx Frames", CPSW_STAT(rxundersizedframes) },
	{ "Rx Fragments", CPSW_STAT(rxfragments) },
	{ "Rx Octets", CPSW_STAT(rxoctets) },
	{ "Good Tx Frames", CPSW_STAT(txgoodframes) },
	{ "Broadcast Tx Frames", CPSW_STAT(txbroadcastframes) },
	{ "Multicast Tx Frames", CPSW_STAT(txmulticastframes) },
	{ "Pause Tx Frames", CPSW_STAT(txpauseframes) },
	{ "Deferred Tx Frames", CPSW_STAT(txdeferredframes) },
	{ "Collisions", CPSW_STAT(txcollisionframes) },
	{ "Single Collision Tx Frames", CPSW_STAT(txsinglecollframes) },
	{ "Multiple Collision Tx Frames", CPSW_STAT(txmultcollframes) },
	{ "Excessive Collisions", CPSW_STAT(txexcessivecollisions) },
	{ "Late Collisions", CPSW_STAT(txlatecollisions) },
	{ "Tx Underrun", CPSW_STAT(txunderrun) },
	{ "Carrier Sense Errors", CPSW_STAT(txcarriersenseerrors) },
	{ "Tx Octets", CPSW_STAT(txoctets) },
	{ "Rx + Tx 64 Octet Frames", CPSW_STAT(octetframes64) },
	{ "Rx + Tx 65-127 Octet Frames", CPSW_STAT(octetframes65t127) },
	{ "Rx + Tx 128-255 Octet Frames", CPSW_STAT(octetframes128t255) },
	{ "Rx + Tx 256-511 Octet Frames", CPSW_STAT(octetframes256t511) },
	{ "Rx + Tx 512-1023 Octet Frames", CPSW_STAT(octetframes512t1023) },
	{ "Rx + Tx 1024-Up Octet Frames", CPSW_STAT(octetframes1024tup) },
	{ "Net Octets", CPSW_STAT(netoctets) },
	{ "Rx Start of Frame Overruns", CPSW_STAT(rxsofoverruns) },
	{ "Rx Middle of Frame Overruns", CPSW_STAT(rxmofoverruns) },
	{ "Rx DMA Overruns", CPSW_STAT(rxdmaoverruns) },
};

static const struct cpsw_stats cpsw_gstrings_ch_stats[] = {
	{ "head_enqueue", CPDMA_RX_STAT(head_enqueue) },
	{ "tail_enqueue", CPDMA_RX_STAT(tail_enqueue) },
	{ "pad_enqueue", CPDMA_RX_STAT(pad_enqueue) },
	{ "misqueued", CPDMA_RX_STAT(misqueued) },
	{ "desc_alloc_fail", CPDMA_RX_STAT(desc_alloc_fail) },
	{ "pad_alloc_fail", CPDMA_RX_STAT(pad_alloc_fail) },
	{ "runt_receive_buf", CPDMA_RX_STAT(runt_receive_buff) },
	{ "runt_transmit_buf", CPDMA_RX_STAT(runt_transmit_buff) },
	{ "empty_dequeue", CPDMA_RX_STAT(empty_dequeue) },
	{ "busy_dequeue", CPDMA_RX_STAT(busy_dequeue) },
	{ "good_dequeue", CPDMA_RX_STAT(good_dequeue) },
	{ "requeue", CPDMA_RX_STAT(requeue) },
	{ "teardown_dequeue", CPDMA_RX_STAT(teardown_dequeue) },
};

#define CPSW_STATS_COMMON_LEN	ARRAY_SIZE(cpsw_gstrings_stats)
#define CPSW_STATS_CH_LEN	ARRAY_SIZE(cpsw_gstrings_ch_stats)

u32 cpsw_get_msglevel(struct net_device *ndev)
{
	struct cpsw_priv *priv = netdev_priv(ndev);

	return priv->msg_enable;
}

void cpsw_set_msglevel(struct net_device *ndev, u32 value)
{
	struct cpsw_priv *priv = netdev_priv(ndev);

	priv->msg_enable = value;
}

int cpsw_get_coalesce(struct net_device *ndev, struct ethtool_coalesce *coal)
{
	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);

	coal->rx_coalesce_usecs = cpsw->coal_intvl;
	return 0;
}

int cpsw_set_coalesce(struct net_device *ndev, struct ethtool_coalesce *coal)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	u32 int_ctrl;
	u32 num_interrupts = 0;
	u32 prescale = 0;
	u32 addnl_dvdr = 1;
	u32 coal_intvl = 0;
	struct cpsw_common *cpsw = priv->cpsw;

	coal_intvl = coal->rx_coalesce_usecs;

	int_ctrl =  readl(&cpsw->wr_regs->int_control);
	prescale = cpsw->bus_freq_mhz * 4;

	if (!coal->rx_coalesce_usecs) {
		int_ctrl &= ~(CPSW_INTPRESCALE_MASK | CPSW_INTPACEEN);
		goto update_return;
	}

	if (coal_intvl < CPSW_CMINTMIN_INTVL)
		coal_intvl = CPSW_CMINTMIN_INTVL;

	if (coal_intvl > CPSW_CMINTMAX_INTVL) {
		/* Interrupt pacer works with 4us Pulse, we can
		 * throttle further by dilating the 4us pulse.
		 */
		addnl_dvdr = CPSW_INTPRESCALE_MASK / prescale;

		if (addnl_dvdr > 1) {
			prescale *= addnl_dvdr;
			if (coal_intvl > (CPSW_CMINTMAX_INTVL * addnl_dvdr))
				coal_intvl = (CPSW_CMINTMAX_INTVL
						* addnl_dvdr);
		} else {
			addnl_dvdr = 1;
			coal_intvl = CPSW_CMINTMAX_INTVL;
		}
	}

	num_interrupts = (1000 * addnl_dvdr) / coal_intvl;
	writel(num_interrupts, &cpsw->wr_regs->rx_imax);
	writel(num_interrupts, &cpsw->wr_regs->tx_imax);

	int_ctrl |= CPSW_INTPACEEN;
	int_ctrl &= (~CPSW_INTPRESCALE_MASK);
	int_ctrl |= (prescale & CPSW_INTPRESCALE_MASK);

update_return:
	writel(int_ctrl, &cpsw->wr_regs->int_control);

	cpsw_notice(priv, timer, "Set coalesce to %d usecs.\n", coal_intvl);
	cpsw->coal_intvl = coal_intvl;

	return 0;
}

int cpsw_get_sset_count(struct net_device *ndev, int sset)
{
	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);

	switch (sset) {
	case ETH_SS_STATS:
		return (CPSW_STATS_COMMON_LEN +
		       (cpsw->rx_ch_num + cpsw->tx_ch_num) *
		       CPSW_STATS_CH_LEN);
	default:
		return -EOPNOTSUPP;
	}
}

static void cpsw_add_ch_strings(u8 **p, int ch_num, int rx_dir)
{
	int ch_stats_len;
	int line;
	int i;

	ch_stats_len = CPSW_STATS_CH_LEN * ch_num;
	for (i = 0; i < ch_stats_len; i++) {
		line = i % CPSW_STATS_CH_LEN;
		snprintf(*p, ETH_GSTRING_LEN,
			 "%s DMA chan %ld: %s", rx_dir ? "Rx" : "Tx",
			 (long)(i / CPSW_STATS_CH_LEN),
			 cpsw_gstrings_ch_stats[line].stat_string);
		*p += ETH_GSTRING_LEN;
	}
}

void cpsw_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
{
	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);
	u8 *p = data;
	int i;

	switch (stringset) {
	case ETH_SS_STATS:
		for (i = 0; i < CPSW_STATS_COMMON_LEN; i++) {
			memcpy(p, cpsw_gstrings_stats[i].stat_string,
			       ETH_GSTRING_LEN);
			p += ETH_GSTRING_LEN;
		}

		cpsw_add_ch_strings(&p, cpsw->rx_ch_num, 1);
		cpsw_add_ch_strings(&p, cpsw->tx_ch_num, 0);
		break;
	}
}

void cpsw_get_ethtool_stats(struct net_device *ndev,
			    struct ethtool_stats *stats, u64 *data)
{
	u8 *p;
	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);
	struct cpdma_chan_stats ch_stats;
	int i, l, ch;

	/* Collect Davinci CPDMA stats for Rx and Tx Channel */
	for (l = 0; l < CPSW_STATS_COMMON_LEN; l++)
		data[l] = readl(cpsw->hw_stats +
				cpsw_gstrings_stats[l].stat_offset);

	for (ch = 0; ch < cpsw->rx_ch_num; ch++) {
		cpdma_chan_get_stats(cpsw->rxv[ch].ch, &ch_stats);
		for (i = 0; i < CPSW_STATS_CH_LEN; i++, l++) {
			p = (u8 *)&ch_stats +
				cpsw_gstrings_ch_stats[i].stat_offset;
			data[l] = *(u32 *)p;
		}
	}

	for (ch = 0; ch < cpsw->tx_ch_num; ch++) {
		cpdma_chan_get_stats(cpsw->txv[ch].ch, &ch_stats);
		for (i = 0; i < CPSW_STATS_CH_LEN; i++, l++) {
			p = (u8 *)&ch_stats +
				cpsw_gstrings_ch_stats[i].stat_offset;
			data[l] = *(u32 *)p;
		}
	}
}

void cpsw_get_pauseparam(struct net_device *ndev,
			 struct ethtool_pauseparam *pause)
{
	struct cpsw_priv *priv = netdev_priv(ndev);

	pause->autoneg = AUTONEG_DISABLE;
	pause->rx_pause = priv->rx_pause ? true : false;
	pause->tx_pause = priv->tx_pause ? true : false;
}

void cpsw_get_wol(struct net_device *ndev, struct ethtool_wolinfo *wol)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int slave_no = cpsw_slave_index(cpsw, priv);

	wol->supported = 0;
	wol->wolopts = 0;

	if (cpsw->slaves[slave_no].phy)
		phy_ethtool_get_wol(cpsw->slaves[slave_no].phy, wol);
}

int cpsw_set_wol(struct net_device *ndev, struct ethtool_wolinfo *wol)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int slave_no = cpsw_slave_index(cpsw, priv);

	if (cpsw->slaves[slave_no].phy)
		return phy_ethtool_set_wol(cpsw->slaves[slave_no].phy, wol);
	else
		return -EOPNOTSUPP;
}

int cpsw_get_regs_len(struct net_device *ndev)
{
	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);

	return cpsw->data.ale_entries * ALE_ENTRY_WORDS * sizeof(u32);
}

void cpsw_get_regs(struct net_device *ndev, struct ethtool_regs *regs, void *p)
{
	u32 *reg = p;
	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);

	/* update CPSW IP version */
	regs->version = cpsw->version;

	cpsw_ale_dump(cpsw->ale, reg);
}

int cpsw_ethtool_op_begin(struct net_device *ndev)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int ret;

	ret = pm_runtime_get_sync(cpsw->dev);
	if (ret < 0) {
		cpsw_err(priv, drv, "ethtool begin failed %d\n", ret);
		pm_runtime_put_noidle(cpsw->dev);
	}

	return ret;
}

void cpsw_ethtool_op_complete(struct net_device *ndev)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	int ret;

	ret = pm_runtime_put(priv->cpsw->dev);
	if (ret < 0)
		cpsw_err(priv, drv, "ethtool complete failed %d\n", ret);
}

void cpsw_get_channels(struct net_device *ndev, struct ethtool_channels *ch)
{
	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);

	ch->max_rx = cpsw->quirk_irq ? 1 : CPSW_MAX_QUEUES;
	ch->max_tx = cpsw->quirk_irq ? 1 : CPSW_MAX_QUEUES;
	ch->max_combined = 0;
	ch->max_other = 0;
	ch->other_count = 0;
	ch->rx_count = cpsw->rx_ch_num;
	ch->tx_count = cpsw->tx_ch_num;
	ch->combined_count = 0;
}

int cpsw_get_link_ksettings(struct net_device *ndev,
			    struct ethtool_link_ksettings *ecmd)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int slave_no = cpsw_slave_index(cpsw, priv);

	if (!cpsw->slaves[slave_no].phy)
		return -EOPNOTSUPP;

	phy_ethtool_ksettings_get(cpsw->slaves[slave_no].phy, ecmd);
	return 0;
}

int cpsw_set_link_ksettings(struct net_device *ndev,
			    const struct ethtool_link_ksettings *ecmd)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int slave_no = cpsw_slave_index(cpsw, priv);

	if (!cpsw->slaves[slave_no].phy)
		return -EOPNOTSUPP;

	return phy_ethtool_ksettings_set(cpsw->slaves[slave_no].phy, ecmd);
}

int cpsw_get_eee(struct net_device *ndev, struct ethtool_eee *edata)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int slave_no = cpsw_slave_index(cpsw, priv);

	if (cpsw->slaves[slave_no].phy)
		return phy_ethtool_get_eee(cpsw->slaves[slave_no].phy, edata);
	else
		return -EOPNOTSUPP;
}

int cpsw_set_eee(struct net_device *ndev, struct ethtool_eee *edata)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int slave_no = cpsw_slave_index(cpsw, priv);

	if (cpsw->slaves[slave_no].phy)
		return phy_ethtool_set_eee(cpsw->slaves[slave_no].phy, edata);
	else
		return -EOPNOTSUPP;
}

int cpsw_nway_reset(struct net_device *ndev)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int slave_no = cpsw_slave_index(cpsw, priv);

	if (cpsw->slaves[slave_no].phy)
		return genphy_restart_aneg(cpsw->slaves[slave_no].phy);
	else
		return -EOPNOTSUPP;
}

static void cpsw_suspend_data_pass(struct net_device *ndev)
{
	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);
	int i;

	/* Disable NAPI scheduling */
	cpsw_intr_disable(cpsw);

	/* Stop all transmit queues for every network device.
	 */
	for (i = 0; i < cpsw->data.slaves; i++) {
		ndev = cpsw->slaves[i].ndev;
		if (!(ndev && netif_running(ndev)))
			continue;

		netif_tx_stop_all_queues(ndev);

		/* Barrier, so that stop_queue visible to other cpus */
		smp_mb__after_atomic();
	}

	/* Handle rest of tx packets and stop cpdma channels */
	cpdma_ctlr_stop(cpsw->dma);
}

static int cpsw_resume_data_pass(struct net_device *ndev)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int i, ret;

	/* After this receive is started */
	if (cpsw->usage_count) {
		ret = cpsw_fill_rx_channels(priv);
		if (ret)
			return ret;

		cpdma_ctlr_start(cpsw->dma);
		cpsw_intr_enable(cpsw);
	}

	/* Resume transmit for every affected interface */
	for (i = 0; i < cpsw->data.slaves; i++) {
		ndev = cpsw->slaves[i].ndev;
		if (ndev && netif_running(ndev))
			netif_tx_start_all_queues(ndev);
	}

	return 0;
}

static int cpsw_check_ch_settings(struct cpsw_common *cpsw,
				  struct ethtool_channels *ch)
{
	if (cpsw->quirk_irq) {
		dev_err(cpsw->dev, "Maximum one tx/rx queue is allowed");
		return -EOPNOTSUPP;
	}

	if (ch->combined_count)
		return -EINVAL;

	/* verify we have at least one channel in each direction */
	if (!ch->rx_count || !ch->tx_count)
		return -EINVAL;

	if (ch->rx_count > cpsw->data.channels ||
	    ch->tx_count > cpsw->data.channels)
		return -EINVAL;

	return 0;
}

static int cpsw_update_channels_res(struct cpsw_priv *priv, int ch_num, int rx,
				    cpdma_handler_fn rx_handler)
{
	struct cpsw_common *cpsw = priv->cpsw;
	void (*handler)(void *, int, int);
	struct netdev_queue *queue;
	struct cpsw_vector *vec;
	int ret, *ch, vch;

	if (rx) {
		ch = &cpsw->rx_ch_num;
		vec = cpsw->rxv;
		handler = rx_handler;
	} else {
		ch = &cpsw->tx_ch_num;
		vec = cpsw->txv;
		handler = cpsw_tx_handler;
	}

	while (*ch < ch_num) {
		vch = rx ? *ch : 7 - *ch;
		vec[*ch].ch = cpdma_chan_create(cpsw->dma, vch, handler, rx);
		queue = netdev_get_tx_queue(priv->ndev, *ch);
		queue->tx_maxrate = 0;

		if (IS_ERR(vec[*ch].ch))
			return PTR_ERR(vec[*ch].ch);

		if (!vec[*ch].ch)
			return -EINVAL;

		cpsw_info(priv, ifup, "created new %d %s channel\n", *ch,
			  (rx ? "rx" : "tx"));
		(*ch)++;
	}

	while (*ch > ch_num) {
		(*ch)--;

		ret = cpdma_chan_destroy(vec[*ch].ch);
		if (ret)
			return ret;

		cpsw_info(priv, ifup, "destroyed %d %s channel\n", *ch,
			  (rx ? "rx" : "tx"));
	}

	return 0;
}

int cpsw_set_channels_common(struct net_device *ndev,
			     struct ethtool_channels *chs,
			     cpdma_handler_fn rx_handler)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	struct net_device *sl_ndev;
	int i, ret;

	ret = cpsw_check_ch_settings(cpsw, chs);
	if (ret < 0)
		return ret;

	cpsw_suspend_data_pass(ndev);

	ret = cpsw_update_channels_res(priv, chs->rx_count, 1, rx_handler);
	if (ret)
		goto err;

	ret = cpsw_update_channels_res(priv, chs->tx_count, 0, rx_handler);
	if (ret)
		goto err;

	for (i = 0; i < cpsw->data.slaves; i++) {
		sl_ndev = cpsw->slaves[i].ndev;
		if (!(sl_ndev && netif_running(sl_ndev)))
			continue;

		/* Inform stack about new count of queues */
		ret = netif_set_real_num_tx_queues(sl_ndev, cpsw->tx_ch_num);
		if (ret) {
			dev_err(priv->dev, "cannot set real number of tx queues\n");
			goto err;
		}

		ret = netif_set_real_num_rx_queues(sl_ndev, cpsw->rx_ch_num);
		if (ret) {
			dev_err(priv->dev, "cannot set real number of rx queues\n");
			goto err;
		}
	}

	if (cpsw->usage_count)
		cpsw_split_res(cpsw);

	ret = cpsw_resume_data_pass(ndev);
	if (!ret)
		return 0;
err:
	dev_err(priv->dev, "cannot update channels number, closing device\n");
	dev_close(ndev);
	return ret;
}

void cpsw_get_ringparam(struct net_device *ndev,
			struct ethtool_ringparam *ering)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;

	/* not supported */
	ering->tx_max_pending = cpsw->descs_pool_size - CPSW_MAX_QUEUES;
	ering->tx_pending = cpdma_get_num_tx_descs(cpsw->dma);
	ering->rx_max_pending = cpsw->descs_pool_size - CPSW_MAX_QUEUES;
	ering->rx_pending = cpdma_get_num_rx_descs(cpsw->dma);
}

int cpsw_set_ringparam(struct net_device *ndev,
		       struct ethtool_ringparam *ering)
{
	struct cpsw_priv *priv = netdev_priv(ndev);
	struct cpsw_common *cpsw = priv->cpsw;
	int ret;

	/* ignore ering->tx_pending - only rx_pending adjustment is supported */

	if (ering->rx_mini_pending || ering->rx_jumbo_pending ||
	    ering->rx_pending < CPSW_MAX_QUEUES ||
	    ering->rx_pending > (cpsw->descs_pool_size - CPSW_MAX_QUEUES))
		return -EINVAL;

	if (ering->rx_pending == cpdma_get_num_rx_descs(cpsw->dma))
		return 0;

	cpsw_suspend_data_pass(ndev);

	cpdma_set_num_rx_descs(cpsw->dma, ering->rx_pending);

	if (cpsw->usage_count)
		cpdma_chan_split_pool(cpsw->dma);

	ret = cpsw_resume_data_pass(ndev);
	if (!ret)
		return 0;

	dev_err(cpsw->dev, "cannot set ring params, closing device\n");
	dev_close(ndev);
	return ret;
}

#if IS_ENABLED(CONFIG_TI_CPTS)
int cpsw_get_ts_info(struct net_device *ndev, struct ethtool_ts_info *info)
{
	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);

	info->so_timestamping =
		SOF_TIMESTAMPING_TX_HARDWARE |
		SOF_TIMESTAMPING_TX_SOFTWARE |
		SOF_TIMESTAMPING_RX_HARDWARE |
		SOF_TIMESTAMPING_RX_SOFTWARE |
		SOF_TIMESTAMPING_SOFTWARE |
		SOF_TIMESTAMPING_RAW_HARDWARE;
	info->phc_index = cpsw->cpts->phc_index;
	info->tx_types =
		(1 << HWTSTAMP_TX_OFF) |
		(1 << HWTSTAMP_TX_ON);
	info->rx_filters =
		(1 << HWTSTAMP_FILTER_NONE) |
		(1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT) |
		(1 << HWTSTAMP_FILTER_PTP_V2_EVENT);
	return 0;
}
#else
int cpsw_get_ts_info(struct net_device *ndev, struct ethtool_ts_info *info)
{
	info->so_timestamping =
		SOF_TIMESTAMPING_TX_SOFTWARE |
		SOF_TIMESTAMPING_RX_SOFTWARE |
		SOF_TIMESTAMPING_SOFTWARE;
	info->phc_index = -1;
	info->tx_types = 0;
	info->rx_filters = 0;
	return 0;
}
#endif