// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2005-2006 Fen Systems Ltd.
 * Copyright 2006-2013 Solarflare Communications Inc.
 */

#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/rtnetlink.h>
#include <linux/in.h>
#include "net_driver.h"
#include "workarounds.h"
#include "selftest.h"
#include "efx.h"
#include "efx_channels.h"
#include "rx_common.h"
#include "tx_common.h"
#include "ethtool_common.h"
#include "filter.h"
#include "nic.h"

#define EFX_ETHTOOL_EEPROM_MAGIC 0xEFAB

/**************************************************************************
 *
 * Ethtool operations
 *
 **************************************************************************
 */

/* Identify device by flashing LEDs */
static int efx_ethtool_phys_id(struct net_device *net_dev,
			       enum ethtool_phys_id_state state)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	enum efx_led_mode mode = EFX_LED_DEFAULT;

	switch (state) {
	case ETHTOOL_ID_ON:
		mode = EFX_LED_ON;
		break;
	case ETHTOOL_ID_OFF:
		mode = EFX_LED_OFF;
		break;
	case ETHTOOL_ID_INACTIVE:
		mode = EFX_LED_DEFAULT;
		break;
	case ETHTOOL_ID_ACTIVE:
		return 1;	/* cycle on/off once per second */
	}

	return efx_siena_mcdi_set_id_led(efx, mode);
}

static int efx_ethtool_get_regs_len(struct net_device *net_dev)
{
	return efx_siena_get_regs_len(netdev_priv(net_dev));
}

static void efx_ethtool_get_regs(struct net_device *net_dev,
				 struct ethtool_regs *regs, void *buf)
{
	struct efx_nic *efx = netdev_priv(net_dev);

	regs->version = efx->type->revision;
	efx_siena_get_regs(efx, buf);
}

/*
 * Each channel has a single IRQ and moderation timer, started by any
 * completion (or other event).  Unless the module parameter
 * separate_tx_channels is set, IRQs and moderation are therefore
 * shared between RX and TX completions.  In this case, when RX IRQ
 * moderation is explicitly changed then TX IRQ moderation is
 * automatically changed too, but otherwise we fail if the two values
 * are requested to be different.
 *
 * The hardware does not support a limit on the number of completions
 * before an IRQ, so we do not use the max_frames fields.  We should
 * report and require that max_frames == (usecs != 0), but this would
 * invalidate existing user documentation.
 *
 * The hardware does not have distinct settings for interrupt
 * moderation while the previous IRQ is being handled, so we should
 * not use the 'irq' fields.  However, an earlier developer
 * misunderstood the meaning of the 'irq' fields and the driver did
 * not support the standard fields.  To avoid invalidating existing
 * user documentation, we report and accept changes through either the
 * standard or 'irq' fields.  If both are changed at the same time, we
 * prefer the standard field.
 *
 * We implement adaptive IRQ moderation, but use a different algorithm
 * from that assumed in the definition of struct ethtool_coalesce.
 * Therefore we do not use any of the adaptive moderation parameters
 * in it.
 */

static int efx_ethtool_get_coalesce(struct net_device *net_dev,
				    struct ethtool_coalesce *coalesce,
				    struct kernel_ethtool_coalesce *kernel_coal,
				    struct netlink_ext_ack *extack)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	unsigned int tx_usecs, rx_usecs;
	bool rx_adaptive;

	efx_siena_get_irq_moderation(efx, &tx_usecs, &rx_usecs, &rx_adaptive);

	coalesce->tx_coalesce_usecs = tx_usecs;
	coalesce->tx_coalesce_usecs_irq = tx_usecs;
	coalesce->rx_coalesce_usecs = rx_usecs;
	coalesce->rx_coalesce_usecs_irq = rx_usecs;
	coalesce->use_adaptive_rx_coalesce = rx_adaptive;

	return 0;
}

static int efx_ethtool_set_coalesce(struct net_device *net_dev,
				    struct ethtool_coalesce *coalesce,
				    struct kernel_ethtool_coalesce *kernel_coal,
				    struct netlink_ext_ack *extack)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	struct efx_channel *channel;
	unsigned int tx_usecs, rx_usecs;
	bool adaptive, rx_may_override_tx;
	int rc;

	efx_siena_get_irq_moderation(efx, &tx_usecs, &rx_usecs, &adaptive);

	if (coalesce->rx_coalesce_usecs != rx_usecs)
		rx_usecs = coalesce->rx_coalesce_usecs;
	else
		rx_usecs = coalesce->rx_coalesce_usecs_irq;

	adaptive = coalesce->use_adaptive_rx_coalesce;

	/* If channels are shared, TX IRQ moderation can be quietly
	 * overridden unless it is changed from its old value.
	 */
	rx_may_override_tx = (coalesce->tx_coalesce_usecs == tx_usecs &&
			      coalesce->tx_coalesce_usecs_irq == tx_usecs);
	if (coalesce->tx_coalesce_usecs != tx_usecs)
		tx_usecs = coalesce->tx_coalesce_usecs;
	else
		tx_usecs = coalesce->tx_coalesce_usecs_irq;

	rc = efx_siena_init_irq_moderation(efx, tx_usecs, rx_usecs, adaptive,
					   rx_may_override_tx);
	if (rc != 0)
		return rc;

	efx_for_each_channel(channel, efx)
		efx->type->push_irq_moderation(channel);

	return 0;
}

static void
efx_ethtool_get_ringparam(struct net_device *net_dev,
			  struct ethtool_ringparam *ring,
			  struct kernel_ethtool_ringparam *kernel_ring,
			  struct netlink_ext_ack *extack)
{
	struct efx_nic *efx = netdev_priv(net_dev);

	ring->rx_max_pending = EFX_MAX_DMAQ_SIZE;
	ring->tx_max_pending = EFX_TXQ_MAX_ENT(efx);
	ring->rx_pending = efx->rxq_entries;
	ring->tx_pending = efx->txq_entries;
}

static int
efx_ethtool_set_ringparam(struct net_device *net_dev,
			  struct ethtool_ringparam *ring,
			  struct kernel_ethtool_ringparam *kernel_ring,
			  struct netlink_ext_ack *extack)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	u32 txq_entries;

	if (ring->rx_mini_pending || ring->rx_jumbo_pending ||
	    ring->rx_pending > EFX_MAX_DMAQ_SIZE ||
	    ring->tx_pending > EFX_TXQ_MAX_ENT(efx))
		return -EINVAL;

	if (ring->rx_pending < EFX_RXQ_MIN_ENT) {
		netif_err(efx, drv, efx->net_dev,
			  "RX queues cannot be smaller than %u\n",
			  EFX_RXQ_MIN_ENT);
		return -EINVAL;
	}

	txq_entries = max(ring->tx_pending, EFX_TXQ_MIN_ENT(efx));
	if (txq_entries != ring->tx_pending)
		netif_warn(efx, drv, efx->net_dev,
			   "increasing TX queue size to minimum of %u\n",
			   txq_entries);

	return efx_siena_realloc_channels(efx, ring->rx_pending, txq_entries);
}

static void efx_ethtool_get_wol(struct net_device *net_dev,
				struct ethtool_wolinfo *wol)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	return efx->type->get_wol(efx, wol);
}


static int efx_ethtool_set_wol(struct net_device *net_dev,
			       struct ethtool_wolinfo *wol)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	return efx->type->set_wol(efx, wol->wolopts);
}

static void efx_ethtool_get_fec_stats(struct net_device *net_dev,
				      struct ethtool_fec_stats *fec_stats)
{
	struct efx_nic *efx = netdev_priv(net_dev);

	if (efx->type->get_fec_stats)
		efx->type->get_fec_stats(efx, fec_stats);
}

static int efx_ethtool_get_ts_info(struct net_device *net_dev,
				   struct kernel_ethtool_ts_info *ts_info)
{
	struct efx_nic *efx = netdev_priv(net_dev);

	efx_siena_ptp_get_ts_info(efx, ts_info);
	return 0;
}

const struct ethtool_ops efx_siena_ethtool_ops = {
	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
				     ETHTOOL_COALESCE_USECS_IRQ |
				     ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
	.get_drvinfo		= efx_siena_ethtool_get_drvinfo,
	.get_regs_len		= efx_ethtool_get_regs_len,
	.get_regs		= efx_ethtool_get_regs,
	.get_msglevel		= efx_siena_ethtool_get_msglevel,
	.set_msglevel		= efx_siena_ethtool_set_msglevel,
	.get_link		= ethtool_op_get_link,
	.get_coalesce		= efx_ethtool_get_coalesce,
	.set_coalesce		= efx_ethtool_set_coalesce,
	.get_ringparam		= efx_ethtool_get_ringparam,
	.set_ringparam		= efx_ethtool_set_ringparam,
	.get_pauseparam         = efx_siena_ethtool_get_pauseparam,
	.set_pauseparam         = efx_siena_ethtool_set_pauseparam,
	.get_sset_count		= efx_siena_ethtool_get_sset_count,
	.self_test		= efx_siena_ethtool_self_test,
	.get_strings		= efx_siena_ethtool_get_strings,
	.set_phys_id		= efx_ethtool_phys_id,
	.get_ethtool_stats	= efx_siena_ethtool_get_stats,
	.get_wol                = efx_ethtool_get_wol,
	.set_wol                = efx_ethtool_set_wol,
	.reset			= efx_siena_ethtool_reset,
	.get_rxnfc		= efx_siena_ethtool_get_rxnfc,
	.set_rxnfc		= efx_siena_ethtool_set_rxnfc,
	.get_rxfh_indir_size	= efx_siena_ethtool_get_rxfh_indir_size,
	.get_rxfh_key_size	= efx_siena_ethtool_get_rxfh_key_size,
	.get_rxfh		= efx_siena_ethtool_get_rxfh,
	.set_rxfh		= efx_siena_ethtool_set_rxfh,
	.get_ts_info		= efx_ethtool_get_ts_info,
	.get_module_info	= efx_siena_ethtool_get_module_info,
	.get_module_eeprom	= efx_siena_ethtool_get_module_eeprom,
	.get_link_ksettings	= efx_siena_ethtool_get_link_ksettings,
	.set_link_ksettings	= efx_siena_ethtool_set_link_ksettings,
	.get_fec_stats		= efx_ethtool_get_fec_stats,
	.get_fecparam		= efx_siena_ethtool_get_fecparam,
	.set_fecparam		= efx_siena_ethtool_set_fecparam,
};
