// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright IBM Corp. 2018
 */

#define pr_fmt(fmt) "qeth: " fmt

#include <linux/ethtool.h>
#include "qeth_core.h"


#define QETH_TXQ_STAT(_name, _stat) { \
        .name = _name, \
        .offset = offsetof(struct qeth_out_q_stats, _stat) \
}

#define QETH_CARD_STAT(_name, _stat) { \
        .name = _name, \
        .offset = offsetof(struct qeth_card_stats, _stat) \
}

struct qeth_stats {
        char name[ETH_GSTRING_LEN];
        unsigned int offset;
};

static const struct qeth_stats txq_stats[] = {
        QETH_TXQ_STAT("IO buffers", bufs),
        QETH_TXQ_STAT("IO buffer elements", buf_elements),
        QETH_TXQ_STAT("packed IO buffers", bufs_pack),
        QETH_TXQ_STAT("skbs", tx_packets),
        QETH_TXQ_STAT("packed skbs", skbs_pack),
        QETH_TXQ_STAT("SG skbs", skbs_sg),
        QETH_TXQ_STAT("HW csum skbs", skbs_csum),
        QETH_TXQ_STAT("TSO skbs", skbs_tso),
        QETH_TXQ_STAT("linearized skbs", skbs_linearized),
        QETH_TXQ_STAT("linearized+error skbs", skbs_linearized_fail),
        QETH_TXQ_STAT("TSO bytes", tso_bytes),
        QETH_TXQ_STAT("Packing mode switches", packing_mode_switch),
        QETH_TXQ_STAT("Queue stopped", stopped),
        QETH_TXQ_STAT("Doorbell", doorbell),
        QETH_TXQ_STAT("IRQ for frames", coal_frames),
        QETH_TXQ_STAT("Completion IRQ", completion_irq),
        QETH_TXQ_STAT("Completion yield", completion_yield),
        QETH_TXQ_STAT("Completion timer", completion_timer),
};

static const struct qeth_stats card_stats[] = {
        QETH_CARD_STAT("rx0 IO buffers", rx_bufs),
        QETH_CARD_STAT("rx0 HW csum skbs", rx_skb_csum),
        QETH_CARD_STAT("rx0 SG skbs", rx_sg_skbs),
        QETH_CARD_STAT("rx0 SG page frags", rx_sg_frags),
        QETH_CARD_STAT("rx0 SG page allocs", rx_sg_alloc_page),
        QETH_CARD_STAT("rx0 dropped, no memory", rx_dropped_nomem),
        QETH_CARD_STAT("rx0 dropped, bad format", rx_dropped_notsupp),
        QETH_CARD_STAT("rx0 dropped, runt", rx_dropped_runt),
};

#define TXQ_STATS_LEN   ARRAY_SIZE(txq_stats)
#define CARD_STATS_LEN  ARRAY_SIZE(card_stats)

static void qeth_add_stat_data(u64 **dst, void *src,
                               const struct qeth_stats stats[],
                               unsigned int size)
{
        unsigned int i;
        char *stat;

        for (i = 0; i < size; i++) {
                stat = (char *)src + stats[i].offset;
                **dst = *(u64 *)stat;
                (*dst)++;
        }
}

static void qeth_add_stat_strings(u8 **data, const char *prefix,
                                  const struct qeth_stats stats[],
                                  unsigned int size)
{
        unsigned int i;

        for (i = 0; i < size; i++)
                ethtool_sprintf(data, "%s%s", prefix, stats[i].name);
}

static int qeth_get_sset_count(struct net_device *dev, int stringset)
{
        struct qeth_card *card = dev->ml_priv;

        switch (stringset) {
        case ETH_SS_STATS:
                return CARD_STATS_LEN +
                       card->qdio.no_out_queues * TXQ_STATS_LEN;
        default:
                return -EINVAL;
        }
}

static void qeth_get_ethtool_stats(struct net_device *dev,
                                   struct ethtool_stats *stats, u64 *data)
{
        struct qeth_card *card = dev->ml_priv;
        unsigned int i;

        qeth_add_stat_data(&data, &card->stats, card_stats, CARD_STATS_LEN);
        for (i = 0; i < card->qdio.no_out_queues; i++)
                qeth_add_stat_data(&data, &card->qdio.out_qs[i]->stats,
                                   txq_stats, TXQ_STATS_LEN);
}

static void __qeth_set_coalesce(struct net_device *dev,
                                struct qeth_qdio_out_q *queue,
                                struct ethtool_coalesce *coal)
{
        WRITE_ONCE(queue->coalesce_usecs, coal->tx_coalesce_usecs);
        WRITE_ONCE(queue->max_coalesced_frames, coal->tx_max_coalesced_frames);

        if (coal->tx_coalesce_usecs &&
            netif_running(dev) &&
            !qeth_out_queue_is_empty(queue))
                qeth_tx_arm_timer(queue, coal->tx_coalesce_usecs);
}

static int qeth_set_coalesce(struct net_device *dev,
                             struct ethtool_coalesce *coal,
                             struct kernel_ethtool_coalesce *kernel_coal,
                             struct netlink_ext_ack *extack)
{
        struct qeth_card *card = dev->ml_priv;
        struct qeth_qdio_out_q *queue;
        unsigned int i;

        if (!IS_IQD(card))
                return -EOPNOTSUPP;

        if (!coal->tx_coalesce_usecs && !coal->tx_max_coalesced_frames)
                return -EINVAL;

        qeth_for_each_output_queue(card, queue, i)
                __qeth_set_coalesce(dev, queue, coal);

        return 0;
}

static void qeth_get_ringparam(struct net_device *dev,
                               struct ethtool_ringparam *param,
                               struct kernel_ethtool_ringparam *kernel_param,
                               struct netlink_ext_ack *extack)
{
        struct qeth_card *card = dev->ml_priv;

        param->rx_max_pending = QDIO_MAX_BUFFERS_PER_Q;
        param->rx_mini_max_pending = 0;
        param->rx_jumbo_max_pending = 0;
        param->tx_max_pending = QDIO_MAX_BUFFERS_PER_Q;

        param->rx_pending = card->qdio.in_buf_pool.buf_count;
        param->rx_mini_pending = 0;
        param->rx_jumbo_pending = 0;
        param->tx_pending = QDIO_MAX_BUFFERS_PER_Q;
}

static void qeth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
{
        struct qeth_card *card = dev->ml_priv;
        char prefix[ETH_GSTRING_LEN] = "";
        unsigned int i;

        switch (stringset) {
        case ETH_SS_STATS:
                qeth_add_stat_strings(&data, prefix, card_stats,
                                      CARD_STATS_LEN);
                for (i = 0; i < card->qdio.no_out_queues; i++) {
                        scnprintf(prefix, ETH_GSTRING_LEN, "tx%u ", i);
                        qeth_add_stat_strings(&data, prefix, txq_stats,
                                              TXQ_STATS_LEN);
                }
                break;
        default:
                WARN_ON(1);
                break;
        }
}

static void qeth_get_drvinfo(struct net_device *dev,
                             struct ethtool_drvinfo *info)
{
        struct qeth_card *card = dev->ml_priv;

        strscpy(info->driver, IS_LAYER2(card) ? "qeth_l2" : "qeth_l3",
                sizeof(info->driver));
        strscpy(info->fw_version, card->info.mcl_level,
                sizeof(info->fw_version));
        scnprintf(info->bus_info, sizeof(info->bus_info), "%s/%s/%s",
                  CARD_RDEV_ID(card), CARD_WDEV_ID(card), CARD_DDEV_ID(card));
}

static void qeth_get_channels(struct net_device *dev,
                              struct ethtool_channels *channels)
{
        struct qeth_card *card = dev->ml_priv;

        channels->max_rx = dev->num_rx_queues;
        channels->max_tx = card->qdio.no_out_queues;
        channels->max_other = 0;
        channels->max_combined = 0;
        channels->rx_count = dev->real_num_rx_queues;
        channels->tx_count = dev->real_num_tx_queues;
        channels->other_count = 0;
        channels->combined_count = 0;
}

static int qeth_set_channels(struct net_device *dev,
                             struct ethtool_channels *channels)
{
        struct qeth_priv *priv = netdev_priv(dev);
        struct qeth_card *card = dev->ml_priv;
        int rc;

        if (channels->rx_count == 0 || channels->tx_count == 0)
                return -EINVAL;
        if (channels->tx_count > card->qdio.no_out_queues)
                return -EINVAL;

        /* Prio-queueing needs all TX queues: */
        if (qeth_uses_tx_prio_queueing(card))
                return -EPERM;

        if (IS_IQD(card)) {
                if (channels->tx_count < QETH_IQD_MIN_TXQ)
                        return -EINVAL;

                /* Reject downgrade while running. It could push displaced
                 * ucast flows onto txq0, which is reserved for mcast.
                 */
                if (netif_running(dev) &&
                    channels->tx_count < dev->real_num_tx_queues)
                        return -EPERM;
        }

        rc = qeth_set_real_num_tx_queues(card, channels->tx_count);
        if (!rc)
                priv->tx_wanted_queues = channels->tx_count;

        return rc;
}

static int qeth_get_ts_info(struct net_device *dev,
                            struct kernel_ethtool_ts_info *info)
{
        struct qeth_card *card = dev->ml_priv;

        if (!IS_IQD(card))
                return -EOPNOTSUPP;

        return ethtool_op_get_ts_info(dev, info);
}

static int qeth_get_tunable(struct net_device *dev,
                            const struct ethtool_tunable *tuna, void *data)
{
        struct qeth_priv *priv = netdev_priv(dev);

        switch (tuna->id) {
        case ETHTOOL_RX_COPYBREAK:
                *(u32 *)data = priv->rx_copybreak;
                return 0;
        default:
                return -EOPNOTSUPP;
        }
}

static int qeth_set_tunable(struct net_device *dev,
                            const struct ethtool_tunable *tuna,
                            const void *data)
{
        struct qeth_priv *priv = netdev_priv(dev);

        switch (tuna->id) {
        case ETHTOOL_RX_COPYBREAK:
                WRITE_ONCE(priv->rx_copybreak, *(u32 *)data);
                return 0;
        default:
                return -EOPNOTSUPP;
        }
}

static int qeth_get_per_queue_coalesce(struct net_device *dev, u32 __queue,
                                       struct ethtool_coalesce *coal)
{
        struct qeth_card *card = dev->ml_priv;
        struct qeth_qdio_out_q *queue;

        if (!IS_IQD(card))
                return -EOPNOTSUPP;

        if (__queue >= card->qdio.no_out_queues)
                return -EINVAL;

        queue = card->qdio.out_qs[__queue];

        coal->tx_coalesce_usecs = queue->coalesce_usecs;
        coal->tx_max_coalesced_frames = queue->max_coalesced_frames;
        return 0;
}

static int qeth_set_per_queue_coalesce(struct net_device *dev, u32 queue,
                                       struct ethtool_coalesce *coal)
{
        struct qeth_card *card = dev->ml_priv;

        if (!IS_IQD(card))
                return -EOPNOTSUPP;

        if (queue >= card->qdio.no_out_queues)
                return -EINVAL;

        if (!coal->tx_coalesce_usecs && !coal->tx_max_coalesced_frames)
                return -EINVAL;

        __qeth_set_coalesce(dev, card->qdio.out_qs[queue], coal);
        return 0;
}

/* Helper function to fill 'advertising' and 'supported' which are the same. */
/* Autoneg and full-duplex are supported and advertised unconditionally.     */
/* Always advertise and support all speeds up to specified, and only one     */
/* specified port type.                                                      */
static void qeth_set_ethtool_link_modes(struct ethtool_link_ksettings *cmd,
                                        enum qeth_link_mode link_mode)
{
        ethtool_link_ksettings_zero_link_mode(cmd, supported);
        ethtool_link_ksettings_zero_link_mode(cmd, advertising);
        ethtool_link_ksettings_zero_link_mode(cmd, lp_advertising);

        ethtool_link_ksettings_add_link_mode(cmd, supported, Autoneg);
        ethtool_link_ksettings_add_link_mode(cmd, advertising, Autoneg);

        switch (cmd->base.port) {
        case PORT_TP:
                ethtool_link_ksettings_add_link_mode(cmd, supported, TP);
                ethtool_link_ksettings_add_link_mode(cmd, advertising, TP);

                switch (cmd->base.speed) {
                case SPEED_10000:
                        ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                             10000baseT_Full);
                        ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                             10000baseT_Full);
                        fallthrough;
                case SPEED_1000:
                        ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                             1000baseT_Full);
                        ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                             1000baseT_Full);
                        ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                             1000baseT_Half);
                        ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                             1000baseT_Half);
                        fallthrough;
                case SPEED_100:
                        ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                             100baseT_Full);
                        ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                             100baseT_Full);
                        ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                             100baseT_Half);
                        ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                             100baseT_Half);
                        fallthrough;
                case SPEED_10:
                        ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                             10baseT_Full);
                        ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                             10baseT_Full);
                        ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                             10baseT_Half);
                        ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                             10baseT_Half);
                        break;
                default:
                        break;
                }

                break;
        case PORT_FIBRE:
                ethtool_link_ksettings_add_link_mode(cmd, supported, FIBRE);
                ethtool_link_ksettings_add_link_mode(cmd, advertising, FIBRE);

                switch (cmd->base.speed) {
                case SPEED_25000:
                        ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                             25000baseSR_Full);
                        ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                             25000baseSR_Full);
                        break;
                case SPEED_10000:
                        if (link_mode == QETH_LINK_MODE_FIBRE_LONG) {
                                ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                                     10000baseLR_Full);
                                ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                                     10000baseLR_Full);
                        } else if (link_mode == QETH_LINK_MODE_FIBRE_SHORT) {
                                ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                                     10000baseSR_Full);
                                ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                                     10000baseSR_Full);
                        }
                        break;
                case SPEED_1000:
                        ethtool_link_ksettings_add_link_mode(cmd, supported,
                                                             1000baseX_Full);
                        ethtool_link_ksettings_add_link_mode(cmd, advertising,
                                                             1000baseX_Full);
                        break;
                default:
                        break;
                }

                break;
        default:
                break;
        }
}

static int qeth_get_link_ksettings(struct net_device *netdev,
                                   struct ethtool_link_ksettings *cmd)
{
        struct qeth_card *card = netdev->ml_priv;

        QETH_CARD_TEXT(card, 4, "ethtglks");
        cmd->base.speed = card->info.link_info.speed;
        cmd->base.duplex = card->info.link_info.duplex;
        cmd->base.port = card->info.link_info.port;
        cmd->base.autoneg = AUTONEG_ENABLE;
        cmd->base.phy_address = 0;
        cmd->base.mdio_support = 0;
        cmd->base.eth_tp_mdix = ETH_TP_MDI_INVALID;
        cmd->base.eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID;

        qeth_set_ethtool_link_modes(cmd, card->info.link_info.link_mode);

        return 0;
}

const struct ethtool_ops qeth_ethtool_ops = {
        .supported_coalesce_params = ETHTOOL_COALESCE_TX_USECS |
                                     ETHTOOL_COALESCE_TX_MAX_FRAMES,
        .get_link = ethtool_op_get_link,
        .set_coalesce = qeth_set_coalesce,
        .get_ringparam = qeth_get_ringparam,
        .get_strings = qeth_get_strings,
        .get_ethtool_stats = qeth_get_ethtool_stats,
        .get_sset_count = qeth_get_sset_count,
        .get_drvinfo = qeth_get_drvinfo,
        .get_channels = qeth_get_channels,
        .set_channels = qeth_set_channels,
        .get_ts_info = qeth_get_ts_info,
        .get_tunable = qeth_get_tunable,
        .set_tunable = qeth_set_tunable,
        .get_per_queue_coalesce = qeth_get_per_queue_coalesce,
        .set_per_queue_coalesce = qeth_set_per_queue_coalesce,
        .get_link_ksettings = qeth_get_link_ksettings,
};