// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2009 - 2018 Intel Corporation. */

/* ethtool support for igbvf */

#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>

#include "igbvf.h"
#include <linux/if_vlan.h>

struct igbvf_stats {
        char stat_string[ETH_GSTRING_LEN];
        int sizeof_stat;
        int stat_offset;
        int base_stat_offset;
};

#define IGBVF_STAT(current, base) \
                sizeof(((struct igbvf_adapter *)0)->current), \
                offsetof(struct igbvf_adapter, current), \
                offsetof(struct igbvf_adapter, base)

static const struct igbvf_stats igbvf_gstrings_stats[] = {
        { "rx_packets", IGBVF_STAT(stats.gprc, stats.base_gprc) },
        { "tx_packets", IGBVF_STAT(stats.gptc, stats.base_gptc) },
        { "rx_bytes", IGBVF_STAT(stats.gorc, stats.base_gorc) },
        { "tx_bytes", IGBVF_STAT(stats.gotc, stats.base_gotc) },
        { "multicast", IGBVF_STAT(stats.mprc, stats.base_mprc) },
        { "lbrx_packets", IGBVF_STAT(stats.gprlbc, stats.base_gprlbc) },
        { "lbtx_packets", IGBVF_STAT(stats.gptlbc, stats.base_gptlbc) },
        { "lbrx_bytes", IGBVF_STAT(stats.gorlbc, stats.base_gorlbc) },
        { "lbtx_bytes", IGBVF_STAT(stats.gotlbc, stats.base_gotlbc) },
        { "tx_restart_queue", IGBVF_STAT(restart_queue, zero_base) },
        { "tx_timeout_count", IGBVF_STAT(tx_timeout_count, zero_base) },
        { "rx_csum_offload_good", IGBVF_STAT(hw_csum_good, zero_base) },
        { "rx_csum_offload_errors", IGBVF_STAT(hw_csum_err, zero_base) },
        { "rx_header_split", IGBVF_STAT(rx_hdr_split, zero_base) },
        { "alloc_rx_buff_failed", IGBVF_STAT(alloc_rx_buff_failed, zero_base) },
};

#define IGBVF_GLOBAL_STATS_LEN ARRAY_SIZE(igbvf_gstrings_stats)

static const char igbvf_gstrings_test[][ETH_GSTRING_LEN] = {
        "Link test   (on/offline)"
};

#define IGBVF_TEST_LEN ARRAY_SIZE(igbvf_gstrings_test)

static int igbvf_get_link_ksettings(struct net_device *netdev,
                                    struct ethtool_link_ksettings *cmd)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        u32 status;

        ethtool_link_ksettings_zero_link_mode(cmd, supported);
        ethtool_link_ksettings_add_link_mode(cmd, supported, 1000baseT_Full);
        ethtool_link_ksettings_zero_link_mode(cmd, advertising);
        ethtool_link_ksettings_add_link_mode(cmd, advertising, 1000baseT_Full);

        cmd->base.port = -1;

        status = er32(STATUS);
        if (status & E1000_STATUS_LU) {
                if (status & E1000_STATUS_SPEED_1000)
                        cmd->base.speed = SPEED_1000;
                else if (status & E1000_STATUS_SPEED_100)
                        cmd->base.speed = SPEED_100;
                else
                        cmd->base.speed = SPEED_10;

                if (status & E1000_STATUS_FD)
                        cmd->base.duplex = DUPLEX_FULL;
                else
                        cmd->base.duplex = DUPLEX_HALF;
        } else {
                cmd->base.speed = SPEED_UNKNOWN;
                cmd->base.duplex = DUPLEX_UNKNOWN;
        }

        cmd->base.autoneg = AUTONEG_DISABLE;

        return 0;
}

static int igbvf_set_link_ksettings(struct net_device *netdev,
                                    const struct ethtool_link_ksettings *cmd)
{
        return -EOPNOTSUPP;
}

static void igbvf_get_pauseparam(struct net_device *netdev,
                                 struct ethtool_pauseparam *pause)
{
}

static int igbvf_set_pauseparam(struct net_device *netdev,
                                struct ethtool_pauseparam *pause)
{
        return -EOPNOTSUPP;
}

static u32 igbvf_get_msglevel(struct net_device *netdev)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        return adapter->msg_enable;
}

static void igbvf_set_msglevel(struct net_device *netdev, u32 data)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        adapter->msg_enable = data;
}

static int igbvf_get_regs_len(struct net_device *netdev)
{
#define IGBVF_REGS_LEN 8
        return IGBVF_REGS_LEN * sizeof(u32);
}

static void igbvf_get_regs(struct net_device *netdev,
                           struct ethtool_regs *regs, void *p)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        u32 *regs_buff = p;

        memset(p, 0, IGBVF_REGS_LEN * sizeof(u32));

        regs->version = (1u << 24) |
                        (adapter->pdev->revision << 16) |
                        adapter->pdev->device;

        regs_buff[0] = er32(CTRL);
        regs_buff[1] = er32(STATUS);

        regs_buff[2] = er32(RDLEN(0));
        regs_buff[3] = er32(RDH(0));
        regs_buff[4] = er32(RDT(0));

        regs_buff[5] = er32(TDLEN(0));
        regs_buff[6] = er32(TDH(0));
        regs_buff[7] = er32(TDT(0));
}

static int igbvf_get_eeprom_len(struct net_device *netdev)
{
        return 0;
}

static int igbvf_get_eeprom(struct net_device *netdev,
                            struct ethtool_eeprom *eeprom, u8 *bytes)
{
        return -EOPNOTSUPP;
}

static int igbvf_set_eeprom(struct net_device *netdev,
                            struct ethtool_eeprom *eeprom, u8 *bytes)
{
        return -EOPNOTSUPP;
}

static void igbvf_get_drvinfo(struct net_device *netdev,
                              struct ethtool_drvinfo *drvinfo)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        strscpy(drvinfo->driver,  igbvf_driver_name, sizeof(drvinfo->driver));
        strscpy(drvinfo->bus_info, pci_name(adapter->pdev),
                sizeof(drvinfo->bus_info));
}

static void igbvf_get_ringparam(struct net_device *netdev,
                                struct ethtool_ringparam *ring,
                                struct kernel_ethtool_ringparam *kernel_ring,
                                struct netlink_ext_ack *extack)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct igbvf_ring *tx_ring = adapter->tx_ring;
        struct igbvf_ring *rx_ring = adapter->rx_ring;

        ring->rx_max_pending = IGBVF_MAX_RXD;
        ring->tx_max_pending = IGBVF_MAX_TXD;
        ring->rx_pending = rx_ring->count;
        ring->tx_pending = tx_ring->count;
}

static int igbvf_set_ringparam(struct net_device *netdev,
                               struct ethtool_ringparam *ring,
                               struct kernel_ethtool_ringparam *kernel_ring,
                               struct netlink_ext_ack *extack)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct igbvf_ring *temp_ring;
        int err = 0;
        u32 new_rx_count, new_tx_count;

        if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
                return -EINVAL;

        new_rx_count = max_t(u32, ring->rx_pending, IGBVF_MIN_RXD);
        new_rx_count = min_t(u32, new_rx_count, IGBVF_MAX_RXD);
        new_rx_count = ALIGN(new_rx_count, REQ_RX_DESCRIPTOR_MULTIPLE);

        new_tx_count = max_t(u32, ring->tx_pending, IGBVF_MIN_TXD);
        new_tx_count = min_t(u32, new_tx_count, IGBVF_MAX_TXD);
        new_tx_count = ALIGN(new_tx_count, REQ_TX_DESCRIPTOR_MULTIPLE);

        if ((new_tx_count == adapter->tx_ring->count) &&
            (new_rx_count == adapter->rx_ring->count)) {
                /* nothing to do */
                return 0;
        }

        while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
                usleep_range(1000, 2000);

        if (!netif_running(adapter->netdev)) {
                adapter->tx_ring->count = new_tx_count;
                adapter->rx_ring->count = new_rx_count;
                goto clear_reset;
        }

        temp_ring = vmalloc(sizeof(struct igbvf_ring));
        if (!temp_ring) {
                err = -ENOMEM;
                goto clear_reset;
        }

        igbvf_down(adapter);

        /* We can't just free everything and then setup again,
         * because the ISRs in MSI-X mode get passed pointers
         * to the Tx and Rx ring structs.
         */
        if (new_tx_count != adapter->tx_ring->count) {
                memcpy(temp_ring, adapter->tx_ring, sizeof(struct igbvf_ring));

                temp_ring->count = new_tx_count;
                err = igbvf_setup_tx_resources(adapter, temp_ring);
                if (err)
                        goto err_setup;

                igbvf_free_tx_resources(adapter->tx_ring);

                memcpy(adapter->tx_ring, temp_ring, sizeof(struct igbvf_ring));
        }

        if (new_rx_count != adapter->rx_ring->count) {
                memcpy(temp_ring, adapter->rx_ring, sizeof(struct igbvf_ring));

                temp_ring->count = new_rx_count;
                err = igbvf_setup_rx_resources(adapter, temp_ring);
                if (err)
                        goto err_setup;

                igbvf_free_rx_resources(adapter->rx_ring);

                memcpy(adapter->rx_ring, temp_ring, sizeof(struct igbvf_ring));
        }
err_setup:
        igbvf_up(adapter);
        vfree(temp_ring);
clear_reset:
        clear_bit(__IGBVF_RESETTING, &adapter->state);
        return err;
}

static int igbvf_link_test(struct igbvf_adapter *adapter, u64 *data)
{
        struct e1000_hw *hw = &adapter->hw;
        *data = 0;

        spin_lock_bh(&hw->mbx_lock);

        hw->mac.ops.check_for_link(hw);

        spin_unlock_bh(&hw->mbx_lock);

        if (!(er32(STATUS) & E1000_STATUS_LU))
                *data = 1;

        return *data;
}

static void igbvf_diag_test(struct net_device *netdev,
                            struct ethtool_test *eth_test, u64 *data)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        set_bit(__IGBVF_TESTING, &adapter->state);

        /* Link test performed before hardware reset so autoneg doesn't
         * interfere with test result
         */
        if (igbvf_link_test(adapter, &data[0]))
                eth_test->flags |= ETH_TEST_FL_FAILED;

        clear_bit(__IGBVF_TESTING, &adapter->state);
        msleep_interruptible(4 * 1000);
}

static void igbvf_get_wol(struct net_device *netdev,
                          struct ethtool_wolinfo *wol)
{
        wol->supported = 0;
        wol->wolopts = 0;
}

static int igbvf_set_wol(struct net_device *netdev,
                         struct ethtool_wolinfo *wol)
{
        return -EOPNOTSUPP;
}

static int igbvf_get_coalesce(struct net_device *netdev,
                              struct ethtool_coalesce *ec,
                              struct kernel_ethtool_coalesce *kernel_coal,
                              struct netlink_ext_ack *extack)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        if (adapter->requested_itr <= 3)
                ec->rx_coalesce_usecs = adapter->requested_itr;
        else
                ec->rx_coalesce_usecs = adapter->current_itr >> 2;

        return 0;
}

static int igbvf_set_coalesce(struct net_device *netdev,
                              struct ethtool_coalesce *ec,
                              struct kernel_ethtool_coalesce *kernel_coal,
                              struct netlink_ext_ack *extack)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;

        if ((ec->rx_coalesce_usecs >= IGBVF_MIN_ITR_USECS) &&
            (ec->rx_coalesce_usecs <= IGBVF_MAX_ITR_USECS)) {
                adapter->current_itr = ec->rx_coalesce_usecs << 2;
                adapter->requested_itr = 1000000000 /
                                        (adapter->current_itr * 256);
        } else if ((ec->rx_coalesce_usecs == 3) ||
                   (ec->rx_coalesce_usecs == 2)) {
                adapter->current_itr = IGBVF_START_ITR;
                adapter->requested_itr = ec->rx_coalesce_usecs;
        } else if (ec->rx_coalesce_usecs == 0) {
                /* The user's desire is to turn off interrupt throttling
                 * altogether, but due to HW limitations, we can't do that.
                 * Instead we set a very small value in EITR, which would
                 * allow ~967k interrupts per second, but allow the adapter's
                 * internal clocking to still function properly.
                 */
                adapter->current_itr = 4;
                adapter->requested_itr = 1000000000 /
                                        (adapter->current_itr * 256);
        } else {
                return -EINVAL;
        }

        writel(adapter->current_itr,
               hw->hw_addr + adapter->rx_ring->itr_register);

        return 0;
}

static int igbvf_nway_reset(struct net_device *netdev)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        if (netif_running(netdev))
                igbvf_reinit_locked(adapter);
        return 0;
}

static void igbvf_get_ethtool_stats(struct net_device *netdev,
                                    struct ethtool_stats *stats,
                                    u64 *data)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        int i;

        igbvf_update_stats(adapter);
        for (i = 0; i < IGBVF_GLOBAL_STATS_LEN; i++) {
                char *p = (char *)adapter +
                          igbvf_gstrings_stats[i].stat_offset;
                char *b = (char *)adapter +
                          igbvf_gstrings_stats[i].base_stat_offset;
                data[i] = ((igbvf_gstrings_stats[i].sizeof_stat ==
                            sizeof(u64)) ? (*(u64 *)p - *(u64 *)b) :
                            (*(u32 *)p - *(u32 *)b));
        }
}

static int igbvf_get_sset_count(struct net_device *dev, int stringset)
{
        switch (stringset) {
        case ETH_SS_TEST:
                return IGBVF_TEST_LEN;
        case ETH_SS_STATS:
                return IGBVF_GLOBAL_STATS_LEN;
        default:
                return -EINVAL;
        }
}

static void igbvf_get_strings(struct net_device *netdev, u32 stringset,
                              u8 *data)
{
        u8 *p = data;
        int i;

        switch (stringset) {
        case ETH_SS_TEST:
                memcpy(data, *igbvf_gstrings_test, sizeof(igbvf_gstrings_test));
                break;
        case ETH_SS_STATS:
                for (i = 0; i < IGBVF_GLOBAL_STATS_LEN; i++) {
                        memcpy(p, igbvf_gstrings_stats[i].stat_string,
                               ETH_GSTRING_LEN);
                        p += ETH_GSTRING_LEN;
                }
                break;
        }
}

static const struct ethtool_ops igbvf_ethtool_ops = {
        .supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS,
        .get_drvinfo            = igbvf_get_drvinfo,
        .get_regs_len           = igbvf_get_regs_len,
        .get_regs               = igbvf_get_regs,
        .get_wol                = igbvf_get_wol,
        .set_wol                = igbvf_set_wol,
        .get_msglevel           = igbvf_get_msglevel,
        .set_msglevel           = igbvf_set_msglevel,
        .nway_reset             = igbvf_nway_reset,
        .get_link               = ethtool_op_get_link,
        .get_eeprom_len         = igbvf_get_eeprom_len,
        .get_eeprom             = igbvf_get_eeprom,
        .set_eeprom             = igbvf_set_eeprom,
        .get_ringparam          = igbvf_get_ringparam,
        .set_ringparam          = igbvf_set_ringparam,
        .get_pauseparam         = igbvf_get_pauseparam,
        .set_pauseparam         = igbvf_set_pauseparam,
        .self_test              = igbvf_diag_test,
        .get_sset_count         = igbvf_get_sset_count,
        .get_strings            = igbvf_get_strings,
        .get_ethtool_stats      = igbvf_get_ethtool_stats,
        .get_coalesce           = igbvf_get_coalesce,
        .set_coalesce           = igbvf_set_coalesce,
        .get_link_ksettings     = igbvf_get_link_ksettings,
        .set_link_ksettings     = igbvf_set_link_ksettings,
};

void igbvf_set_ethtool_ops(struct net_device *netdev)
{
        netdev->ethtool_ops = &igbvf_ethtool_ops;
}