path: root/drivers/net/ethernet/freescale/gianfar_ethtool.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  drivers/net/ethernet/freescale/gianfar_ethtool.c
 *
 *  Gianfar Ethernet Driver
 *  Ethtool support for Gianfar Enet
 *  Based on e1000 ethtool support
 *
 *  Author: Andy Fleming
 *  Maintainer: Kumar Gala
 *  Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
 *
 *  Copyright 2003-2006, 2008-2009, 2011 Freescale Semiconductor, Inc.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/net_tstamp.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mm.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/crc32.h>
#include <asm/types.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/sort.h>
#include <linux/if_vlan.h>
#include <linux/of_platform.h>
#include <linux/fsl/ptp_qoriq.h>

#include "gianfar.h"

#define GFAR_MAX_COAL_USECS 0xffff
#define GFAR_MAX_COAL_FRAMES 0xff

static const char stat_gstrings[][ETH_GSTRING_LEN] = {
	/* extra stats */
	"rx-allocation-errors",
	"rx-large-frame-errors",
	"rx-short-frame-errors",
	"rx-non-octet-errors",
	"rx-crc-errors",
	"rx-overrun-errors",
	"rx-busy-errors",
	"rx-babbling-errors",
	"rx-truncated-frames",
	"ethernet-bus-error",
	"tx-babbling-errors",
	"tx-underrun-errors",
	"tx-timeout-errors",
	/* rmon stats */
	"tx-rx-64-frames",
	"tx-rx-65-127-frames",
	"tx-rx-128-255-frames",
	"tx-rx-256-511-frames",
	"tx-rx-512-1023-frames",
	"tx-rx-1024-1518-frames",
	"tx-rx-1519-1522-good-vlan",
	"rx-bytes",
	"rx-packets",
	"rx-fcs-errors",
	"receive-multicast-packet",
	"receive-broadcast-packet",
	"rx-control-frame-packets",
	"rx-pause-frame-packets",
	"rx-unknown-op-code",
	"rx-alignment-error",
	"rx-frame-length-error",
	"rx-code-error",
	"rx-carrier-sense-error",
	"rx-undersize-packets",
	"rx-oversize-packets",
	"rx-fragmented-frames",
	"rx-jabber-frames",
	"rx-dropped-frames",
	"tx-byte-counter",
	"tx-packets",
	"tx-multicast-packets",
	"tx-broadcast-packets",
	"tx-pause-control-frames",
	"tx-deferral-packets",
	"tx-excessive-deferral-packets",
	"tx-single-collision-packets",
	"tx-multiple-collision-packets",
	"tx-late-collision-packets",
	"tx-excessive-collision-packets",
	"tx-total-collision",
	"reserved",
	"tx-dropped-frames",
	"tx-jabber-frames",
	"tx-fcs-errors",
	"tx-control-frames",
	"tx-oversize-frames",
	"tx-undersize-frames",
	"tx-fragmented-frames",
};

/* Fill in a buffer with the strings which correspond to the
 * stats */
static void gfar_gstrings(struct net_device *dev, u32 stringset, u8 * buf)
{
	struct gfar_private *priv = netdev_priv(dev);

	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON)
		memcpy(buf, stat_gstrings, GFAR_STATS_LEN * ETH_GSTRING_LEN);
	else
		memcpy(buf, stat_gstrings,
		       GFAR_EXTRA_STATS_LEN * ETH_GSTRING_LEN);
}

/* Fill in an array of 64-bit statistics from various sources.
 * This array will be appended to the end of the ethtool_stats
 * structure, and returned to user space
 */
static void gfar_fill_stats(struct net_device *dev, struct ethtool_stats *dummy,
			    u64 *buf)
{
	int i;
	struct gfar_private *priv = netdev_priv(dev);
	struct gfar __iomem *regs = priv->gfargrp[0].regs;
	atomic64_t *extra = (atomic64_t *)&priv->extra_stats;

	for (i = 0; i < GFAR_EXTRA_STATS_LEN; i++)
		buf[i] = atomic64_read(&extra[i]);

	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON) {
		u32 __iomem *rmon = (u32 __iomem *) &regs->rmon;

		for (; i < GFAR_STATS_LEN; i++, rmon++)
			buf[i] = (u64) gfar_read(rmon);
	}
}

static int gfar_sset_count(struct net_device *dev, int sset)
{
	struct gfar_private *priv = netdev_priv(dev);

	switch (sset) {
	case ETH_SS_STATS:
		if (priv->device_flags & FSL_GIANFAR_DEV_HAS_RMON)
			return GFAR_STATS_LEN;
		else
			return GFAR_EXTRA_STATS_LEN;
	default:
		return -EOPNOTSUPP;
	}
}

/* Fills in the drvinfo structure with some basic info */
static void gfar_gdrvinfo(struct net_device *dev,
			  struct ethtool_drvinfo *drvinfo)
{
	strscpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
}

/* Return the length of the register structure */
static int gfar_reglen(struct net_device *dev)
{
	return sizeof (struct gfar);
}

/* Return a dump of the GFAR register space */
static void gfar_get_regs(struct net_device *dev, struct ethtool_regs *regs,
			  void *regbuf)
{
	int i;
	struct gfar_private *priv = netdev_priv(dev);
	u32 __iomem *theregs = (u32 __iomem *) priv->gfargrp[0].regs;
	u32 *buf = (u32 *) regbuf;

	for (i = 0; i < sizeof (struct gfar) / sizeof (u32); i++)
		buf[i] = gfar_read(&theregs[i]);
}

/* Convert microseconds to ethernet clock ticks, which changes
 * depending on what speed the controller is running at */
static unsigned int gfar_usecs2ticks(struct gfar_private *priv,
				     unsigned int usecs)
{
	struct net_device *ndev = priv->ndev;
	struct phy_device *phydev = ndev->phydev;
	unsigned int count;

	/* The timer is different, depending on the interface speed */
	switch (phydev->speed) {
	case SPEED_1000:
		count = GFAR_GBIT_TIME;
		break;
	case SPEED_100:
		count = GFAR_100_TIME;
		break;
	case SPEED_10:
	default:
		count = GFAR_10_TIME;
		break;
	}

	/* Make sure we return a number greater than 0
	 * if usecs > 0 */
	return DIV_ROUND_UP(usecs * 1000, count);
}

/* Convert ethernet clock ticks to microseconds */
static unsigned int gfar_ticks2usecs(struct gfar_private *priv,
				     unsigned int ticks)
{
	struct net_device *ndev = priv->ndev;
	struct phy_device *phydev = ndev->phydev;
	unsigned int count;

	/* The timer is different, depending on the interface speed */
	switch (phydev->speed) {
	case SPEED_1000:
		count = GFAR_GBIT_TIME;
		break;
	case SPEED_100:
		count = GFAR_100_TIME;
		break;
	case SPEED_10:
	default:
		count = GFAR_10_TIME;
		break;
	}

	/* Make sure we return a number greater than 0 */
	/* if ticks is > 0 */
	return (ticks * count) / 1000;
}

/* Get the coalescing parameters, and put them in the cvals
 * structure.  */
static int gfar_gcoalesce(struct net_device *dev,
			  struct ethtool_coalesce *cvals,
			  struct kernel_ethtool_coalesce *kernel_coal,
			  struct netlink_ext_ack *extack)
{
	struct gfar_private *priv = netdev_priv(dev);
	struct gfar_priv_rx_q *rx_queue = NULL;
	struct gfar_priv_tx_q *tx_queue = NULL;
	unsigned long rxtime;
	unsigned long rxcount;
	unsigned long txtime;
	unsigned long txcount;

	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_COALESCE))
		return -EOPNOTSUPP;

	if (!dev->phydev)
		return -ENODEV;

	rx_queue = priv->rx_queue[0];
	tx_queue = priv->tx_queue[0];

	rxtime  = get_ictt_value(rx_queue->rxic);
	rxcount = get_icft_value(rx_queue->rxic);
	txtime  = get_ictt_value(tx_queue->txic);
	txcount = get_icft_value(tx_queue->txic);
	cvals->rx_coalesce_usecs = gfar_ticks2usecs(priv, rxtime);
	cvals->rx_max_coalesced_frames = rxcount;

	cvals->tx_coalesce_usecs = gfar_ticks2usecs(priv, txtime);
	cvals->tx_max_coalesced_frames = txcount;

	return 0;
}

/* Change the coalescing values.
 * Both cvals->*_usecs and cvals->*_frames have to be > 0
 * in order for coalescing to be active
 */
static int gfar_scoalesce(struct net_device *dev,
			  struct ethtool_coalesce *cvals,
			  struct kernel_ethtool_co