/* Copyright 2008-2016 Freescale Semiconductor, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Freescale Semiconductor nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation, either version 2 of that License or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/string.h>

#include "dpaa_eth.h"
#include "mac.h"

static const char dpaa_stats_percpu[][ETH_GSTRING_LEN] = {
        "interrupts",
        "rx packets",
        "tx packets",
        "tx confirm",
        "tx S/G",
        "tx error",
        "rx error",
};

static char dpaa_stats_global[][ETH_GSTRING_LEN] = {
        /* dpa rx errors */
        "rx dma error",
        "rx frame physical error",
        "rx frame size error",
        "rx header error",

        /* demultiplexing errors */
        "qman cg_tdrop",
        "qman wred",
        "qman error cond",
        "qman early window",
        "qman late window",
        "qman fq tdrop",
        "qman fq retired",
        "qman orp disabled",

        /* congestion related stats */
        "congestion time (ms)",
        "entered congestion",
        "congested (0/1)"
};

#define DPAA_STATS_PERCPU_LEN ARRAY_SIZE(dpaa_stats_percpu)
#define DPAA_STATS_GLOBAL_LEN ARRAY_SIZE(dpaa_stats_global)

static int dpaa_get_link_ksettings(struct net_device *net_dev,
                                   struct ethtool_link_ksettings *cmd)
{
        if (!net_dev->phydev) {
                netdev_dbg(net_dev, "phy device not initialized\n");
                return 0;
        }

        phy_ethtool_ksettings_get(net_dev->phydev, cmd);

        return 0;
}

static int dpaa_set_link_ksettings(struct net_device *net_dev,
                                   const struct ethtool_link_ksettings *cmd)
{
        int err;

        if (!net_dev->phydev) {
                netdev_err(net_dev, "phy device not initialized\n");
                return -ENODEV;
        }

        err = phy_ethtool_ksettings_set(net_dev->phydev, cmd);
        if (err < 0)
                netdev_err(net_dev, "phy_ethtool_ksettings_set() = %d\n", err);

        return err;
}

static void dpaa_get_drvinfo(struct net_device *net_dev,
                             struct ethtool_drvinfo *drvinfo)
{
        int len;

        strlcpy(drvinfo->driver, KBUILD_MODNAME,
                sizeof(drvinfo->driver));
        len = snprintf(drvinfo->version, sizeof(drvinfo->version),
                       "%X", 0);
        len = snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
                       "%X", 0);

        if (len >= sizeof(drvinfo->fw_version)) {
                /* Truncated output */
                netdev_notice(net_dev, "snprintf() = %d\n", len);
        }
        strlcpy(drvinfo->bus_info, dev_name(net_dev->dev.parent->parent),
                sizeof(drvinfo->bus_info));
}

static u32 dpaa_get_msglevel(struct net_device *net_dev)
{
        return ((struct dpaa_priv *)netdev_priv(net_dev))->msg_enable;
}

static void dpaa_set_msglevel(struct net_device *net_dev,
                              u32 msg_enable)
{
        ((struct dpaa_priv *)netdev_priv(net_dev))->msg_enable = msg_enable;
}

static int dpaa_nway_reset(struct net_device *net_dev)
{
        int err;

        if (!net_dev->phydev) {
                netdev_err(net_dev, "phy device not initialized\n");
                return -ENODEV;
        }

        err = 0;
        if (net_dev->phydev->autoneg) {
                err = phy_start_aneg(net_dev->phydev);
                if (err < 0)
                        netdev_err(net_dev, "phy_start_aneg() = %d\n",
                                   err);
        }

        return err;
}

static void dpaa_get_pauseparam(struct net_device *net_dev,
                                struct ethtool_pauseparam *epause)
{
        struct mac_device *mac_dev;
        struct dpaa_priv *priv;

        priv = netdev_priv(net_dev);
        mac_dev = priv->mac_dev;

        if (!net_dev->phydev) {
                netdev_err(net_dev, "phy device not initialized\n");
                return;
        }

        epause->autoneg = mac_dev->autoneg_pause;
        epause->rx_pause = mac_dev->rx_pause_active;
        epause->tx_pause = mac_dev->tx_pause_active;
}

static int dpaa_set_pauseparam(struct net_device *net_dev,
                               struct ethtool_pauseparam *epause)
{
        struct mac_device *mac_dev;
        struct phy_device *phydev;
        bool rx_pause, tx_pause;
        struct dpaa_priv *priv;
        u32 newadv, oldadv;
        int err;

        priv = netdev_priv(net_dev);
        mac_dev = priv->mac_dev;

        phydev = net_dev->phydev;
        if (!phydev) {
                netdev_err(net_dev, "phy device not initialized\n");
                return -ENODEV;
        }

        if (!(phydev->supported & SUPPORTED_Pause) ||
            (!(phydev->supported & SUPPORTED_Asym_Pause) &&
            (epause->rx_pause != epause->tx_pause)))
                return -EINVAL;

        /* The MAC should know how to handle PAUSE frame autonegotiation before
         * adjust_link is triggered by a forced renegotiation of sym/asym PAUSE
         * settings.
         */
        mac_dev->autoneg_pause = !!epause->autoneg;
        mac_dev->rx_pause_req = !!epause->rx_pause;
        mac_dev->tx_pause_req = !!epause->tx_pause;

        /* Determine the sym/asym advertised PAUSE capabilities from the desired
         * rx/tx pause settings.
         */
        newadv = 0;
        if (epause->rx_pause)
                newadv = ADVERTISED_Pause | ADVERTISED_Asym_Pause;
        if (epause->tx_pause)
                newadv |= ADVERTISED_Asym_Pause;

        oldadv = phydev->advertising &
                        (ADVERTISED_Pause | ADVERTISED_Asym_Pause);

        /* If there are differences between the old and the new advertised
         * values, restart PHY autonegotiation and advertise the new values.
         */
        if (oldadv != newadv) {
                phydev->advertising &= ~(ADVERTISED_Pause
                                | ADVERTISED_Asym_Pause);
                phydev->advertising |= newadv;
                if (phydev->autoneg) {
                        err = phy_start_aneg(phydev);
                        if (err < 0)
                                netdev_err(net_dev, "phy_start_aneg() = %d\n",
                                           err);
                }
        }

        fman_get_pause_cfg(mac_dev, &rx_pause, &tx_pause);
        err = fman_set_mac_active_pause(mac_dev, rx_pause, tx_pause);
        if (err < 0)
                netdev_err(net_dev, "set_mac_active_pause() = %d\n", err);

        return err;
}

static int dpaa_get_sset_count(struct net_device *net_dev, int type)
{
        unsigned int total_stats, num_stats;

        num_stats   = num_online_cpus() + 1;
        total_stats = num_stats * (DPAA_STATS_PERCPU_LEN + DPAA_BPS_NUM) +
                        DPAA_STATS_GLOBAL_LEN;

        switch (type) {
        case ETH_SS_STATS:
                return total_stats;
        default:
                return -EOPNOTSUPP;
        }
}

static void copy_stats(struct dpaa_percpu_priv *percpu_priv, int num_cpus,
                       int crr_cpu, u64 *bp_count, u64 *data)
{
        int num_values = num_cpus + 1;
        int crr = 0, j;

        /* update current CPU's stats and also add them to the total values */
        data[crr * num_values + crr_cpu] = percpu_priv->in_interrupt;
        data[crr++ * num_values + num_cpus] += percpu_priv->in_interrupt;

        data[crr * num_values + crr_cpu] = percpu_priv->stats.rx_packets;
        data[crr++ * num_values + num_cpus] += percpu_priv->stats.rx_packets;

        data[crr * num_values + crr_cpu] = percpu_priv->stats.tx_packets;
        data[crr++ * num_values + num_cpus] += percpu_priv->stats.tx_packets;

        data[crr * num_values + crr_cpu] = percpu_priv->tx_confirm;
        data[crr++ * num_values + num_cpus] += percpu_priv->tx_confirm;

        data[crr * num_values + crr_cpu] = percpu_priv->tx_frag_skbuffs;
        data[crr++ * num_values + num_cpus] += percpu_priv->tx_frag_skbuffs;

        data[crr * num_values + crr_cpu] = percpu_priv->stats.tx_errors;
        data[crr++ * num_values + num_cpus] += percpu_priv->stats.tx_errors;

        data[crr * num_values + crr_cpu] = percpu_priv->stats.rx_errors;
        data[crr++ * num_values + num_cpus] += percpu_priv->stats.rx_errors;

        for (j = 0; j < DPAA_BPS_NUM; j++) {
                data[crr * num_values + crr_cpu] = bp_count[j];
                data[crr++ * num_values + num_cpus] += bp_count[j];
        }
}

static void dpaa_get_ethtool_stats(struct net_device *net_dev,
                                   struct ethtool_stats *stats, u64 *data)
{
        u64 bp_count[DPAA_BPS_NUM], cg_time, cg_num;
        struct dpaa_percpu_priv *percpu_priv;
        struct dpaa_rx_errors rx_errors;
        unsigned int num_cpus, offset;
        struct dpaa_ern_cnt ern_cnt;
        struct dpaa_bp *dpaa_bp;
        struct dpaa_priv *priv;
        int total_stats, i, j;
        bool cg_status;

        total_stats = dpaa_get_sset_count(net_dev, ETH_SS_STATS);
        priv     = netdev_priv(net_dev);
        num_cpus = num_online_cpus();

        memset(&bp_count, 0, sizeof(bp_count));
        memset(&rx_errors, 0, sizeof(struct dpaa_rx_errors));
        memset(&ern_cnt, 0, sizeof(struct dpaa_ern_cnt));
        memset(data, 0, total_stats * sizeof(u64));

        for_each_online_cpu(i) {
                percpu_priv = per_cpu_ptr(priv->percpu_priv, i);
                for (j = 0; j < DPAA_BPS_NUM; j++) {
                        dpaa_bp = priv->dpaa_bps[j];
                        if (!dpaa_bp->percpu_count)
                                continue;
                        bp_count[j] = *(per_cpu_ptr(dpaa_bp->percpu_count, i));
                }
                rx_errors.dme += percpu_priv->rx_errors.dme;
                rx_errors.fpe += percpu_priv->rx_errors.fpe;
                rx_errors.fse += percpu_priv->rx_errors.fse;
                rx_errors.phe += percpu_priv->rx_errors.phe;

                ern_cnt.cg_tdrop     += percpu_priv->ern_cnt.cg_tdrop;
                ern_cnt.wred         += percpu_priv->ern_cnt.wred;
                ern_cnt.err_cond     += percpu_priv->ern_cnt.err_cond;
                ern_cnt.early_window += percpu_priv->ern_cnt.early_window;
                ern_cnt.late_window  += percpu_priv->ern_cnt.late_window;
                ern_cnt.fq_tdrop     += percpu_priv->ern_cnt.fq_tdrop;
                ern_cnt.fq_retired   += percpu_priv->ern_cnt.fq_retired;
                ern_cnt.orp_zero     += percpu_priv->ern_cnt.orp_zero;

                copy_stats(percpu_priv, num_cpus, i, bp_count, data);
        }

        offset = (num_cpus + 1) * (DPAA_STATS_PERCPU_LEN + DPAA_BPS_NUM);
        memcpy(data + offset, &rx_errors, sizeof(struct dpaa_rx_errors));

        offset += sizeof(struct dpaa_rx_errors) / sizeof(u64);
        memcpy(data + offset, &ern_cnt, sizeof(struct dpaa_ern_cnt));

        /* gather congestion related counters */
        cg_num    = 0;
        cg_status = 0;
        cg_time   = jiffies_to_msecs(priv->cgr_data.congested_jiffies);
        if (qman_query_cgr_congested(&priv->cgr_data.cgr, &cg_status) == 0) {
                cg_num    = priv->cgr_data.cgr_congested_count;

                /* reset congestion stats (like QMan API does */
                priv->cgr_data.congested_jiffies   = 0;
                priv->cgr_data.cgr_congested_count = 0;
        }

        offset += sizeof(struct dpaa_ern_cnt) / sizeof(u64);
        data[offset++] = cg_time;
        data[offset++] = cg_num;
        data[offset++] = cg_status;
}

static void dpaa_get_strings(struct net_device *net_dev, u32 stringset,
                             u8 *data)
{
        unsigned int i, j, num_cpus, size;
        char string_cpu[ETH_GSTRING_LEN];
        u8 *strings;

        memset(string_cpu, 0, sizeof(string_cpu));
        strings   = data;
        num_cpus  = num_online_cpus();
        size      = DPAA_STATS_GLOBAL_LEN * ETH_GSTRING_LEN;

        for (i = 0; i < DPAA_STATS_PERCPU_LEN; i++) {
                for (j = 0; j < num_cpus; j++) {
                        snprintf(string_cpu, ETH_GSTRING_LEN, "%s [CPU %d]",
                                 dpaa_stats_percpu[i], j);
                        memcpy(strings, string_cpu, ETH_GSTRING_LEN);
                        strings += ETH_GSTRING_LEN;
                }
                snprintf(string_cpu, ETH_GSTRING_LEN, "%s [TOTAL]",
                         dpaa_stats_percpu[i]);
                memcpy(strings, string_cpu, ETH_GSTRING_LEN);
                strings += ETH_GSTRING_LEN;
        }
        for (i = 0; i < DPAA_BPS_NUM; i++) {
                for (j = 0; j < num_cpus; j++) {
                        snprintf(string_cpu, ETH_GSTRING_LEN,
                                 "bpool %c [CPU %d]", 'a' + i, j);
                        memcpy(strings, string_cpu, ETH_GSTRING_LEN);
                        strings += ETH_GSTRING_LEN;
                }
                snprintf(string_cpu, ETH_GSTRING_LEN, "bpool %c [TOTAL]",
                         'a' + i);
                memcpy(strings, string_cpu, ETH_GSTRING_LEN);
                strings += ETH_GSTRING_LEN;
        }
        memcpy(strings, dpaa_stats_global, size);
}

static int dpaa_get_hash_opts(struct net_device *dev,
                              struct ethtool_rxnfc *cmd)
{
        struct dpaa_priv *priv = netdev_priv(dev);

        cmd->data = 0;

        switch (cmd->flow_type) {
        case TCP_V4_FLOW:
        case TCP_V6_FLOW:
        case UDP_V4_FLOW:
        case UDP_V6_FLOW:
                if (priv->keygen_in_use)
                        cmd->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
                /* Fall through */
        case IPV4_FLOW:
        case IPV6_FLOW:
        case SCTP_V4_FLOW:
        case SCTP_V6_FLOW:
        case AH_ESP_V4_FLOW:
        case AH_ESP_V6_FLOW:
        case AH_V4_FLOW:
        case AH_V6_FLOW:
        case ESP_V4_FLOW:
        case ESP_V6_FLOW:
                if (priv->keygen_in_use)
                        cmd->data |= RXH_IP_SRC | RXH_IP_DST;
                break;
        default:
                cmd->data = 0;
                break;
        }

        return 0;
}

static int dpaa_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd,
                          u32 *unused)
{
        int ret = -EOPNOTSUPP;

        switch (cmd->cmd) {
        case ETHTOOL_GRXFH:
                ret = dpaa_get_hash_opts(dev, cmd);
                break;
        default:
                break;
        }

        return ret;
}

static void dpaa_set_hash(struct net_device *net_dev, bool enable)
{
        struct mac_device *mac_dev;
        struct fman_port *rxport;
        struct dpaa_priv *priv;

        priv = netdev_priv(net_dev);
        mac_dev = priv->mac_dev;
        rxport = mac_dev->port[0];

        fman_port_use_kg_hash(rxport, enable);
        priv->keygen_in_use = enable;
}

static int dpaa_set_hash_opts(struct net_device *dev,
                              struct ethtool_rxnfc *nfc)
{
        int ret = -EINVAL;

        /* we support hashing on IPv4/v6 src/dest IP and L4 src/dest port */
        if (nfc->data &
            ~(RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3))
                return -EINVAL;

        switch (nfc->flow_type) {
        case TCP_V4_FLOW:
        case TCP_V6_FLOW:
        case UDP_V4_FLOW:
        case UDP_V6_FLOW:
        case IPV4_FLOW:
        case IPV6_FLOW:
        case SCTP_V4_FLOW:
        case SCTP_V6_FLOW:
        case AH_ESP_V4_FLOW:
        case AH_ESP_V6_FLOW:
        case AH_V4_FLOW:
        case AH_V6_FLOW:
        case ESP_V4_FLOW:
        case ESP_V6_FLOW:
                dpaa_set_hash(dev, !!nfc->data);
                ret = 0;
                break;
        default:
                break;
        }

        return ret;
}

static int dpaa_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd)
{
        int ret = -EOPNOTSUPP;

        switch (cmd->cmd) {
        case ETHTOOL_SRXFH:
                ret = dpaa_set_hash_opts(dev, cmd);
                break;
        default:
                break;
        }

        return ret;
}

const struct ethtool_ops dpaa_ethtool_ops = {
        .get_drvinfo = dpaa_get_drvinfo,
        .get_msglevel = dpaa_get_msglevel,
        .set_msglevel = dpaa_set_msglevel,
        .nway_reset = dpaa_nway_reset,
        .get_pauseparam = dpaa_get_pauseparam,
        .set_pauseparam = dpaa_set_pauseparam,
        .get_link = ethtool_op_get_link,
        .get_sset_count = dpaa_get_sset_count,
        .get_ethtool_stats = dpaa_get_ethtool_stats,
        .get_strings = dpaa_get_strings,
        .get_link_ksettings = dpaa_get_link_ksettings,
        .set_link_ksettings = dpaa_set_link_ksettings,
        .get_rxnfc = dpaa_get_rxnfc,
        .set_rxnfc = dpaa_set_rxnfc,
};