drivers/net/ethernet/amd/xgbe/xgbe-ethtool.c

// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause)
/*
 * Copyright (c) 2014-2025, Advanced Micro Devices, Inc.
 * Copyright (c) 2014, Synopsys, Inc.
 * All rights reserved
 */

#include <linux/spinlock.h>
#include <linux/phy.h>
#include <linux/net_tstamp.h>

#include "xgbe.h"
#include "xgbe-common.h"

struct xgbe_stats {
	char stat_string[ETH_GSTRING_LEN];
	int stat_size;
	int stat_offset;
};

#define XGMAC_MMC_STAT(_string, _var)				\
	{ _string,						\
	  sizeof_field(struct xgbe_mmc_stats, _var),		\
	  offsetof(struct xgbe_prv_data, mmc_stats._var),	\
	}

#define XGMAC_EXT_STAT(_string, _var)				\
	{ _string,						\
	  sizeof_field(struct xgbe_ext_stats, _var),		\
	  offsetof(struct xgbe_prv_data, ext_stats._var),	\
	}

static const struct xgbe_stats xgbe_gstring_stats[] = {
	XGMAC_MMC_STAT("tx_bytes", txoctetcount_gb),
	XGMAC_MMC_STAT("tx_packets", txframecount_gb),
	XGMAC_MMC_STAT("tx_unicast_packets", txunicastframes_gb),
	XGMAC_MMC_STAT("tx_broadcast_packets", txbroadcastframes_gb),
	XGMAC_MMC_STAT("tx_multicast_packets", txmulticastframes_gb),
	XGMAC_MMC_STAT("tx_vlan_packets", txvlanframes_g),
	XGMAC_EXT_STAT("tx_vxlan_packets", tx_vxlan_packets),
	XGMAC_EXT_STAT("tx_tso_packets", tx_tso_packets),
	XGMAC_MMC_STAT("tx_64_byte_packets", tx64octets_gb),
	XGMAC_MMC_STAT("tx_65_to_127_byte_packets", tx65to127octets_gb),
	XGMAC_MMC_STAT("tx_128_to_255_byte_packets", tx128to255octets_gb),
	XGMAC_MMC_STAT("tx_256_to_511_byte_packets", tx256to511octets_gb),
	XGMAC_MMC_STAT("tx_512_to_1023_byte_packets", tx512to1023octets_gb),
	XGMAC_MMC_STAT("tx_1024_to_max_byte_packets", tx1024tomaxoctets_gb),
	XGMAC_MMC_STAT("tx_underflow_errors", txunderflowerror),
	XGMAC_MMC_STAT("tx_pause_frames", txpauseframes),

	XGMAC_MMC_STAT("rx_bytes", rxoctetcount_gb),
	XGMAC_MMC_STAT("rx_packets", rxframecount_gb),
	XGMAC_MMC_STAT("rx_unicast_packets", rxunicastframes_g),
	XGMAC_MMC_STAT("rx_broadcast_packets", rxbroadcastframes_g),
	XGMAC_MMC_STAT("rx_multicast_packets", rxmulticastframes_g),
	XGMAC_MMC_STAT("rx_vlan_packets", rxvlanframes_gb),
	XGMAC_EXT_STAT("rx_vxlan_packets", rx_vxlan_packets),
	XGMAC_MMC_STAT("rx_64_byte_packets", rx64octets_gb),
	XGMAC_MMC_STAT("rx_65_to_127_byte_packets", rx65to127octets_gb),
	XGMAC_MMC_STAT("rx_128_to_255_byte_packets", rx128to255octets_gb),
	XGMAC_MMC_STAT("rx_256_to_511_byte_packets", rx256to511octets_gb),
	XGMAC_MMC_STAT("rx_512_to_1023_byte_packets", rx512to1023octets_gb),
	XGMAC_MMC_STAT("rx_1024_to_max_byte_packets", rx1024tomaxoctets_gb),
	XGMAC_MMC_STAT("rx_undersize_packets", rxundersize_g),
	XGMAC_MMC_STAT("rx_oversize_packets", rxoversize_g),
	XGMAC_MMC_STAT("rx_crc_errors", rxcrcerror),
	XGMAC_MMC_STAT("rx_crc_errors_small_packets", rxrunterror),
	XGMAC_MMC_STAT("rx_crc_errors_giant_packets", rxjabbererror),
	XGMAC_MMC_STAT("rx_length_errors", rxlengtherror),
	XGMAC_MMC_STAT("rx_out_of_range_errors", rxoutofrangetype),
	XGMAC_MMC_STAT("rx_fifo_overflow_errors", rxfifooverflow),
	XGMAC_MMC_STAT("rx_watchdog_errors", rxwatchdogerror),
	XGMAC_EXT_STAT("rx_csum_errors", rx_csum_errors),
	XGMAC_EXT_STAT("rx_vxlan_csum_errors", rx_vxlan_csum_errors),
	XGMAC_MMC_STAT("rx_pause_frames", rxpauseframes),
	XGMAC_EXT_STAT("rx_split_header_packets", rx_split_header_packets),
	XGMAC_EXT_STAT("rx_buffer_unavailable", rx_buffer_unavailable),
};

#define XGBE_STATS_COUNT	ARRAY_SIZE(xgbe_gstring_stats)

static void xgbe_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	int i;

	switch (stringset) {
	case ETH_SS_TEST:
		xgbe_selftest_get_strings(pdata, data);
		break;
	case ETH_SS_STATS:
		for (i = 0; i < XGBE_STATS_COUNT; i++)
			ethtool_puts(&data, xgbe_gstring_stats[i].stat_string);

		for (i = 0; i < pdata->tx_ring_count; i++) {
			ethtool_sprintf(&data, "txq_%u_packets", i);
			ethtool_sprintf(&data, "txq_%u_bytes", i);
		}

		for (i = 0; i < pdata->rx_ring_count; i++) {
			ethtool_sprintf(&data, "rxq_%u_packets", i);
			ethtool_sprintf(&data, "rxq_%u_bytes", i);
		}

		break;
	}
}

static void xgbe_get_ethtool_stats(struct net_device *netdev,
				   struct ethtool_stats *stats, u64 *data)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	u8 *stat;
	int i;

	pdata->hw_if.read_mmc_stats(pdata);
	for (i = 0; i < XGBE_STATS_COUNT; i++) {
		stat = (u8 *)pdata + xgbe_gstring_stats[i].stat_offset;
		*data++ = *(u64 *)stat;
	}
	for (i = 0; i < pdata->tx_ring_count; i++) {
		*data++ = pdata->ext_stats.txq_packets[i];
		*data++ = pdata->ext_stats.txq_bytes[i];
	}
	for (i = 0; i < pdata->rx_ring_count; i++) {
		*data++ = pdata->ext_stats.rxq_packets[i];
		*data++ = pdata->ext_stats.rxq_bytes[i];
	}
}

static int xgbe_get_sset_count(struct net_device *netdev, int stringset)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	int ret;

	switch (stringset) {
	case ETH_SS_TEST:
		ret = xgbe_selftest_get_count(pdata);
		break;
	case ETH_SS_STATS:
		ret = XGBE_STATS_COUNT +
		      (pdata->tx_ring_count * 2) +
		      (pdata->rx_ring_count * 2);
		break;

	default:
		ret = -EOPNOTSUPP;
	}

	return ret;
}

static void xgbe_get_pauseparam(struct net_device *netdev,
				struct ethtool_pauseparam *pause)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	pause->autoneg = pdata->phy.pause_autoneg;
	pause->tx_pause = pdata->phy.tx_pause;
	pause->rx_pause = pdata->phy.rx_pause;
}

static int xgbe_set_pauseparam(struct net_device *netdev,
			       struct ethtool_pauseparam *pause)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	struct ethtool_link_ksettings *lks = &pdata->phy.lks;
	int ret = 0;

	if (pause->autoneg && (pdata->phy.autoneg != AUTONEG_ENABLE)) {
		netdev_err(netdev,
			   "autoneg disabled, pause autoneg not available\n");
		return -EINVAL;
	}

	pdata->phy.pause_autoneg = pause->autoneg;
	pdata->phy.tx_pause = pause->tx_pause;
	pdata->phy.rx_pause = pause->rx_pause;

	XGBE_CLR_ADV(lks, Pause);
	XGBE_CLR_ADV(lks, Asym_Pause);

	if (pause->rx_pause) {
		XGBE_SET_ADV(lks, Pause);
		XGBE_SET_ADV(lks, Asym_Pause);
	}

	if (pause->tx_pause) {
		/* Equivalent to XOR of Asym_Pause */
		if (XGBE_ADV(lks, Asym_Pause))
			XGBE_CLR_ADV(lks, Asym_Pause);
		else
			XGBE_SET_ADV(lks, Asym_Pause);
	}

	if (netif_running(netdev))
		ret = pdata->phy_if.phy_config_aneg(pdata);

	return ret;
}

static int xgbe_get_link_ksettings(struct net_device *netdev,
				   struct ethtool_link_ksettings *cmd)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	struct ethtool_link_ksettings *lks = &pdata->phy.lks;

	cmd->base.phy_address = pdata->phy.address;

	if (netif_carrier_ok(netdev)) {
		cmd->base.speed = pdata->phy.speed;
		cmd->base.duplex = pdata->phy.duplex;
	} else {
		cmd->base.speed = SPEED_UNKNOWN;
		cmd->base.duplex = DUPLEX_UNKNOWN;
	}

	cmd->base.autoneg = pdata->phy.autoneg;
	cmd->base.port = PORT_NONE;

	XGBE_LM_COPY(cmd, supported, lks, supported);
	XGBE_LM_COPY(cmd, advertising, lks, advertising);
	XGBE_LM_COPY(cmd, lp_advertising, lks, lp_advertising);

	return 0;
}

static int xgbe_set_link_ksettings(struct net_device *netdev,
				   const struct ethtool_link_ksettings *cmd)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	struct ethtool_link_ksettings *lks = &pdata->phy.lks;
	__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
	u32 speed;
	int ret;

	speed = cmd->base.speed;

	if (cmd->base.phy_address != pdata->phy.address) {
		netdev_err(netdev, "invalid phy address %hhu\n",
			   cmd->base.phy_address);
		return -EINVAL;
	}

	if ((cmd->base.autoneg != AUTONEG_ENABLE) &&
	    (cmd->base.autoneg != AUTONEG_DISABLE)) {
		netdev_err(netdev, "unsupported autoneg %hhu\n",
			   cmd->base.autoneg);
		return -EINVAL;
	}

	if (cmd->base.autoneg == AUTONEG_DISABLE) {
		if (!pdata->phy_if.phy_valid_speed(pdata, speed)) {
			netdev_err(netdev, "unsupported speed %u\n", speed);
			return -EINVAL;
		}

		if (cmd->base.duplex != DUPLEX_FULL) {
			netdev_err(netdev, "unsupported duplex %hhu\n",
				   cmd->base.duplex);
			return -EINVAL;
		}
	}

	netif_dbg(pdata, link, netdev,
		  "requested advertisement 0x%*pb, phy supported 0x%*pb\n",
		  __ETHTOOL_LINK_MODE_MASK_NBITS, cmd->link_modes.advertising,
		  __ETHTOOL_LINK_MODE_MASK_NBITS, lks->link_modes.supported);

	linkmode_and(advertising, cmd->link_modes.advertising,
		     lks->link_modes.supported);

	if ((cmd->base.autoneg == AUTONEG_ENABLE) &&
	    bitmap_empty(advertising, __ETHTOOL_LINK_MODE_MASK_NBITS)) {
		netdev_err(netdev,
			   "unsupported requested advertisement\n");
		return -EINVAL;
	}

	ret = 0;
	pdata->phy.autoneg = cmd->base.autoneg;
	pdata->phy.speed = speed;
	pdata->phy.duplex = cmd->base.duplex;
	linkmode_copy(lks->link_modes.advertising, advertising);

	if (cmd->base.autoneg == AUTONEG_ENABLE)
		XGBE_SET_ADV(lks, Autoneg);
	else
		XGBE_CLR_ADV(lks, Autoneg);

	if (netif_running(netdev))
		ret = pdata->phy_if.phy_config_aneg(pdata);

	return ret;
}

static void xgbe_get_drvinfo(struct net_device *netdev,
			     struct ethtool_drvinfo *drvinfo)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	struct xgbe_hw_features *hw_feat = &pdata->hw_feat;

	strscpy(drvinfo->driver, XGBE_DRV_NAME, sizeof(drvinfo->driver));
	strscpy(drvinfo->bus_info, dev_name(pdata->dev),
		sizeof(drvinfo->bus_info));
	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d.%d.%d",
		 XGMAC_GET_BITS(hw_feat->version, MAC_VR, USERVER),
		 XGMAC_GET_BITS(hw_feat->version, MAC_VR, DEVID),
		 XGMAC_GET_BITS(hw_feat->version, MAC_VR, SNPSVER));
}

static u32 xgbe_get_msglevel(struct net_device *netdev)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	return pdata->msg_enable;
}

static void xgbe_set_msglevel(struct net_device *netdev, u32 msglevel)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	pdata->msg_enable = msglevel;
}

static int xgbe_get_coalesce(struct net_device *netdev,
			     struct ethtool_coalesce *ec,
			     struct kernel_ethtool_coalesce *kernel_coal,
			     struct netlink_ext_ack *extack)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	memset(ec, 0, sizeof(struct ethtool_coalesce));

	ec->rx_coalesce_usecs = pdata->rx_usecs;
	ec->rx_max_coalesced_frames = pdata->rx_frames;

	ec->tx_coalesce_usecs = pdata->tx_usecs;
	ec->tx_max_coalesced_frames = pdata->tx_frames;

	return 0;
}

static int xgbe_set_coalesce(struct net_device *netdev,
			     struct ethtool_coalesce *ec,
			     struct kernel_ethtool_coalesce *kernel_coal,
			     struct netlink_ext_ack *extack)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	struct xgbe_hw_if *hw_if = &pdata->hw_if;
	unsigned int rx_frames, rx_riwt, rx_usecs;
	unsigned int tx_frames, tx_usecs;
	unsigned int jiffy_us = jiffies_to_usecs(1);

	rx_riwt = hw_if->usec_to_riwt(pdata, ec->rx_coalesce_usecs);
	rx_usecs = ec->rx_coalesce_usecs;
	rx_frames = ec->rx_max_coalesced_frames;

	/* Use smallest possible value if conversion resulted in zero */
	if (rx_usecs && !rx_riwt)
		rx_riwt = 1;

	/* Check the bounds of values for Rx */
	if (rx_riwt > XGMAC_MAX_DMA_RIWT) {
		NL_SET_ERR_MSG_FMT_MOD(extack,
				       "rx-usec is limited to %d usecs",
				       hw_if->riwt_to_usec(pdata,
							   XGMAC_MAX_DMA_RIWT));
		return -EINVAL;
	}
	if (rx_frames > pdata->rx_desc_count) {
		NL_SET_ERR_MSG_FMT_MOD(extack,
				       "rx-frames is limited to %d frames",
				       pdata->rx_desc_count);
		return -EINVAL;
	}

	tx_usecs = ec->tx_coalesce_usecs;
	tx_frames = ec->tx_max_coalesced_frames;

	/* Check the bounds of values for Tx */
	if (!tx_usecs) {
		NL_SET_ERR_MSG_MOD(extack, "tx-usecs must not be 0");
		return -EINVAL;
	}
	if (tx_usecs > XGMAC_MAX_COAL_TX_TICK) {
		NL_SET_ERR_MSG_FMT_MOD(extack, "tx-usecs is limited to %d usec",
				       XGMAC_MAX_COAL_TX_TICK);
		return -EINVAL;
	}
	if (tx_frames > pdata->tx_desc_count) {
		NL_SET_ERR_MSG_FMT_MOD(extack,
				       "tx-frames is limited to %d frames",
				       pdata->tx_desc_count);
		return -EINVAL;
	}

	/* Round tx-usecs to nearest multiple of jiffy granularity */
	if (tx_usecs % jiffy_us) {
		tx_usecs = rounddown(tx_usecs, jiffy_us);
		if (!tx_usecs)
			tx_usecs = jiffy_us;
		NL_SET_ERR_MSG_FMT_MOD(extack,
				       "tx-usecs rounded to %u usec due to jiffy granularity (%u usec)",
				       tx_usecs, jiffy_us);
	}

	pdata->rx_riwt = rx_riwt;
	pdata->rx_usecs = rx_usecs;
	pdata->rx_frames = rx_frames;
	hw_if->config_rx_coalesce(pdata);

	pdata->tx_usecs = tx_usecs;
	pdata->tx_frames = tx_frames;
	hw_if->config_tx_coalesce(pdata);

	return 0;
}

static u32 xgbe_get_rx_ring_count(struct net_device *netdev)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	return pdata->rx_ring_count;
}

static u32 xgbe_get_rxfh_key_size(struct net_device *netdev)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	return sizeof(pdata->rss_key);
}

static u32 xgbe_get_rxfh_indir_size(struct net_device *netdev)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	return ARRAY_SIZE(pdata->rss_table);
}

static int xgbe_get_rxfh(struct net_device *netdev,
			 struct ethtool_rxfh_param *rxfh)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	unsigned int i;

	if (rxfh->indir) {
		for (i = 0; i < ARRAY_SIZE(pdata->rss_table); i++)
			rxfh->indir[i] = XGMAC_GET_BITS(pdata->rss_table[i],
							MAC_RSSDR, DMCH);
	}

	if (rxfh->key)
		memcpy(rxfh->key, pdata->rss_key, sizeof(pdata->rss_key));

	rxfh->hfunc = ETH_RSS_HASH_TOP;

	return 0;
}

static int xgbe_set_rxfh(struct net_device *netdev,
			 struct ethtool_rxfh_param *rxfh,
			 struct netlink_ext_ack *extack)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	struct xgbe_hw_if *hw_if = &pdata->hw_if;
	int ret;

	if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
	    rxfh->hfunc != ETH_RSS_HASH_TOP) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported hash function");
		return -EOPNOTSUPP;
	}

	if (rxfh->indir) {
		ret = hw_if->set_rss_lookup_table(pdata, rxfh->indir);
		if (ret)
			return ret;
	}

	if (rxfh->key) {
		ret = hw_if->set_rss_hash_key(pdata, rxfh->key);
		if (ret)
			return ret;
	}

	return 0;
}

static int xgbe_get_ts_info(struct net_device *netdev,
			    struct kernel_ethtool_ts_info *ts_info)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	ts_info->so_timestamping = SOF_TIMESTAMPING_TX_SOFTWARE |
				   SOF_TIMESTAMPING_TX_HARDWARE |
				   SOF_TIMESTAMPING_RX_HARDWARE |
				   SOF_TIMESTAMPING_RAW_HARDWARE;

	if (pdata->ptp_clock)
		ts_info->phc_index = ptp_clock_index(pdata->ptp_clock);

	ts_info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON);
	ts_info->rx_filters = (1 << HWTSTAMP_FILTER_NONE) |
			      (1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT) |
			      (1 << HWTSTAMP_FILTER_PTP_V1_L4_SYNC) |
			      (1 << HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ) |
			      (1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT) |
			      (1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC) |
			      (1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ) |
			      (1 << HWTSTAMP_FILTER_PTP_V2_EVENT) |
			      (1 << HWTSTAMP_FILTER_PTP_V2_SYNC) |
			      (1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ) |
			      (1 << HWTSTAMP_FILTER_ALL);

	return 0;
}

static int xgbe_get_module_info(struct net_device *netdev,
				struct ethtool_modinfo *modinfo)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	return pdata->phy_if.module_info(pdata, modinfo);
}

static int xgbe_get_module_eeprom(struct net_device *netdev,
				  struct ethtool_eeprom *eeprom, u8 *data)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	return pdata->phy_if.module_eeprom(pdata, eeprom, data);
}

static void
xgbe_get_ringparam(struct net_device *netdev,
		   struct ethtool_ringparam *ringparam,
		   struct kernel_ethtool_ringparam *kernel_ringparam,
		   struct netlink_ext_ack *extack)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);

	ringparam->rx_max_pending = XGBE_RX_DESC_CNT_MAX;
	ringparam->tx_max_pending = XGBE_TX_DESC_CNT_MAX;
	ringparam->rx_pending = pdata->rx_desc_count;
	ringparam->tx_pending = pdata->tx_desc_count;
}

static int xgbe_set_ringparam(struct net_device *netdev,
			      struct ethtool_ringparam *ringparam,
			      struct kernel_ethtool_ringparam *kernel_ringparam,
			      struct netlink_ext_ack *extack)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	unsigned int rx, tx;

	if (ringparam->rx_mini_pending || ringparam->rx_jumbo_pending) {
		NL_SET_ERR_MSG_MOD(extack, "unsupported ring parameter");
		return -EINVAL;
	}

	if ((ringparam->rx_pending < XGBE_RX_DESC_CNT_MIN) ||
	    (ringparam->rx_pending > XGBE_RX_DESC_CNT_MAX)) {
		NL_SET_ERR_MSG_FMT_MOD(extack,
				       "rx ring parameter must be between %u and %u",
				       XGBE_RX_DESC_CNT_MIN,
				       XGBE_RX_DESC_CNT_MAX);
		return -EINVAL;
	}

	if ((ringparam->tx_pending < XGBE_TX_DESC_CNT_MIN) ||
	    (ringparam->tx_pending > XGBE_TX_DESC_CNT_MAX)) {
		NL_SET_ERR_MSG_FMT_MOD(extack,
				       "tx ring parameter must be between %u and %u",
				       XGBE_TX_DESC_CNT_MIN,
				       XGBE_TX_DESC_CNT_MAX);
		return -EINVAL;
	}

	rx = __rounddown_pow_of_two(ringparam->rx_pending);
	if (rx != ringparam->rx_pending)
		NL_SET_ERR_MSG_FMT_MOD(extack,
				       "rx ring parameter rounded to power of two: %u",
				       rx);

	tx = __rounddown_pow_of_two(ringparam->tx_pending);
	if (tx != ringparam->tx_pending)
		NL_SET_ERR_MSG_FMT_MOD(extack,
				       "tx ring parameter rounded to power of two: %u",
				       tx);

	if ((rx == pdata->rx_desc_count) &&
	    (tx == pdata->tx_desc_count))
		goto out;

	pdata->rx_desc_count = rx;
	pdata->tx_desc_count = tx;

	xgbe_restart_dev(pdata);

out:
	return 0;
}

static void xgbe_get_channels(struct net_device *netdev,
			      struct ethtool_channels *channels)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	unsigned int rx, tx, combined;

	/* Calculate maximums allowed:
	 *   - Take into account the number of available IRQs
	 *   - Do not take into account the number of online CPUs so that
	 *     the user can over-subscribe if desired
	 *   - Tx is additionally limited by the number of hardware queues
	 */
	rx = min(pdata->hw_feat.rx_ch_cnt, pdata->rx_max_channel_count);
	rx = min(rx, pdata->channel_irq_count);
	tx = min(pdata->hw_feat.tx_ch_cnt, pdata->tx_max_channel_count);
	tx = min(tx, pdata->channel_irq_count);
	tx = min(tx, pdata->tx_max_q_count);

	combined = min(rx, tx);

	channels->max_combined = combined;
	channels->max_rx = rx ? rx - 1 : 0;
	channels->max_tx = tx ? tx - 1 : 0;

	/* Get current settings based on device state */
	rx = pdata->new_rx_ring_count ? : pdata->rx_ring_count;
	tx = pdata->new_tx_ring_count ? : pdata->tx_ring_count;

	combined = min(rx, tx);
	rx -= combined;
	tx -= combined;

	channels->combined_count = combined;
	channels->rx_count = rx;
	channels->tx_count = tx;
}

static void xgbe_print_set_channels_input(struct net_device *netdev,
					  struct ethtool_channels *channels)
{
	netdev_err(netdev, "channel inputs: combined=%u, rx-only=%u, tx-only=%u\n",
		   channels->combined_count, channels->rx_count,
		   channels->tx_count);
}

static int xgbe_set_channels(struct net_device *netdev,
			     struct ethtool_channels *channels)
{
	struct xgbe_prv_data *pdata = netdev_priv(netdev);
	unsigned int rx, rx_curr, tx, tx_curr, combined;

	/* Calculate maximums allowed:
	 *   - Take into account the number of available IRQs
	 *   - Do not take into account the number of online CPUs so that
	 *     the user can over-subscribe if desired
	 *   - Tx is additionally limited by the number of hardware queues
	 */
	rx = min(pdata->hw_feat.rx_ch_cnt, pdata->rx_max_channel_count);
	rx = min(rx, pdata->channel_irq_count);
	tx = min(pdata->hw_feat.tx_ch_cnt, pdata->tx_max_channel_count);
	tx = min(tx, pdata->tx_max_q_count);
	tx = min(tx, pdata->channel_irq_count);

	combined = min(rx, tx);

	/* Should not be setting other count */
	if (channels->other_count) {
		netdev_err(netdev,
			   "other channel count must be zero\n");
		return -EINVAL;
	}

	/* Require at least one Combined (Rx and Tx) channel */
	if (!channels->combined_count) {
		netdev_err(netdev,
			   "at least one combined Rx/Tx channel is required\n");
		xgbe_print_set_channels_input(netdev, channels);
		return -EINVAL;
	}

	/* Check combined channels */
	if (channels->combined_count > combined) {
		netdev_err(netdev,
			   "combined channel count cannot exceed %u\n",
			   combined);
		xgbe_print_set_channels_input(netdev, channels);
		return -EINVAL;
	}

	/* Can have some Rx-only or Tx-only channels, but not both */
	if (channels->rx_count && channels->tx_count) {
		netdev_err(netdev,
			   "cannot specify both Rx-only and Tx-only channels\n");
		xgbe_print_set_channels_input(netdev, channels);
		return -EINVAL;
	}

	/* Check that we don't exceed the maximum number of channels */
	if ((channels->combined_count + channels->rx_count) > rx) {
		netdev_err(netdev,
			   "total Rx channels (%u) requested exceeds maximum available (%u)\n",
			   channels->combined_count + channels->rx_count, rx);
		xgbe_print_set_channels_input(netdev, channels);
		return -EINVAL;
	}

	if ((channels->combined_count + channels->tx_count) > tx) {
		netdev_err(netdev,
			   "total Tx channels (%u) requested exceeds maximum available (%u)\n",
			   channels->combined_count + channels->tx_count, tx);
		xgbe_print_set_channels_input(netdev, channels);
		return -EINVAL;
	}

	rx = channels->combined_count + channels->rx_count;
	tx = channels->combined_count + channels->tx_count;

	rx_curr = pdata->new_rx_ring_count ? : pdata->rx_ring_count;
	tx_curr = pdata->new_tx_ring_count ? : pdata->tx_ring_count;

	if ((rx == rx_curr) && (tx == tx_curr))
		goto out;

	pdata->new_rx_ring_count = rx;
	pdata->new_tx_ring_count = tx;

	xgbe_full_restart_dev(pdata);

out:
	return 0;
}

static const struct ethtool_ops xgbe_ethtool_ops = {
	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
				     ETHTOOL_COALESCE_MAX_FRAMES,
	.get_drvinfo = xgbe_get_drvinfo,
	.get_msglevel = xgbe_get_msglevel,
	.set_msglevel = xgbe_set_msglevel,
	.get_link = ethtool_op_get_link,
	.get_coalesce = xgbe_get_coalesce,
	.set_coalesce = xgbe_set_coalesce,
	.get_pauseparam = xgbe_get_pauseparam,
	.set_pauseparam = xgbe_set_pauseparam,
	.get_strings = xgbe_get_strings,
	.get_ethtool_stats = xgbe_get_ethtool_stats,
	.get_sset_count = xgbe_get_sset_count,
	.get_rx_ring_count = xgbe_get_rx_ring_count,
	.get_rxfh_key_size = xgbe_get_rxfh_key_size,
	.get_rxfh_indir_size = xgbe_get_rxfh_indir_size,
	.get_rxfh = xgbe_get_rxfh,
	.set_rxfh = xgbe_set_rxfh,
	.get_ts_info = xgbe_get_ts_info,
	.get_link_ksettings = xgbe_get_link_ksettings,
	.set_link_ksettings = xgbe_set_link_ksettings,
	.get_module_info = xgbe_get_module_info,
	.get_module_eeprom = xgbe_get_module_eeprom,
	.get_ringparam = xgbe_get_ringparam,
	.set_ringparam = xgbe_set_ringparam,
	.get_channels = xgbe_get_channels,
	.set_channels = xgbe_set_channels,
	.self_test = xgbe_selftest_run,
};

const struct ethtool_ops *xgbe_get_ethtool_ops(void)
{
	return &xgbe_ethtool_ops;
}