/*-
 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
 *
 * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <sys/cdefs.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>

#include "ipoib.h"

static void ipoib_get_drvinfo(if_t netdev,
                              struct ethtool_drvinfo *drvinfo)
{
        strncpy(drvinfo->driver, "ipoib", sizeof(drvinfo->driver) - 1);
}

static u32 ipoib_get_rx_csum(if_t dev)
{
        struct ipoib_dev_priv *priv = dev->if_softc;
        return test_bit(IPOIB_FLAG_CSUM, &priv->flags) &&
                !test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
}

static int ipoib_get_coalesce(if_t dev,
                              struct ethtool_coalesce *coal)
{
        struct ipoib_dev_priv *priv = dev->if_softc;

        coal->rx_coalesce_usecs = priv->ethtool.coalesce_usecs;
        coal->tx_coalesce_usecs = priv->ethtool.coalesce_usecs;
        coal->rx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
        coal->tx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;

        return 0;
}

static int ipoib_set_coalesce(if_t dev,
                              struct ethtool_coalesce *coal)
{
        struct ipoib_dev_priv *priv = dev->if_softc;
        int ret;

        /*
         * Since IPoIB uses a single CQ for both rx and tx, we assume
         * that rx params dictate the configuration.  These values are
         * saved in the private data and returned when ipoib_get_coalesce()
         * is called.
         */
        if (coal->rx_coalesce_usecs       > 0xffff ||
            coal->rx_max_coalesced_frames > 0xffff)
                return -EINVAL;

        if (coal->rx_max_coalesced_frames | coal->rx_coalesce_usecs) {
                if (!coal->rx_max_coalesced_frames)
                        coal->rx_max_coalesced_frames = 0xffff;
                else if (!coal->rx_coalesce_usecs)
                        coal->rx_coalesce_usecs = 0xffff;
        }

        ret = ib_modify_cq(priv->recv_cq, coal->rx_max_coalesced_frames,
                           coal->rx_coalesce_usecs);
        if (ret && ret != -ENOSYS) {
                ipoib_warn(priv, "failed modifying CQ (%d)\n", ret);
                return ret;
        }

        coal->tx_coalesce_usecs       = coal->rx_coalesce_usecs;
        coal->tx_max_coalesced_frames = coal->rx_max_coalesced_frames;
        priv->ethtool.coalesce_usecs       = coal->rx_coalesce_usecs;
        priv->ethtool.max_coalesced_frames = coal->rx_max_coalesced_frames;

        return 0;
}

static const char ipoib_stats_keys[][ETH_GSTRING_LEN] = {
        "LRO aggregated", "LRO flushed",
        "LRO avg aggr", "LRO no desc"
};

static void ipoib_get_strings(if_t netdev, u32 stringset, u8 *data)
{
        switch (stringset) {
        case ETH_SS_STATS:
                memcpy(data, *ipoib_stats_keys, sizeof(ipoib_stats_keys));
                break;
        }
}

static int ipoib_get_sset_count(if_t dev, int sset)
{
        switch (sset) {
        case ETH_SS_STATS:
                return ARRAY_SIZE(ipoib_stats_keys);
        default:
                return -EOPNOTSUPP;
        }
}

static void ipoib_get_ethtool_stats(if_t dev,
                                struct ethtool_stats *stats, uint64_t *data)
{
        struct ipoib_dev_priv *priv = dev->if_softc;
        int index = 0;

        /* Get LRO statistics */
        data[index++] = priv->lro.lro_mgr.stats.aggregated;
        data[index++] = priv->lro.lro_mgr.stats.flushed;
        if (priv->lro.lro_mgr.stats.flushed)
                data[index++] = priv->lro.lro_mgr.stats.aggregated /
                                priv->lro.lro_mgr.stats.flushed;
        else
                data[index++] = 0;
        data[index++] = priv->lro.lro_mgr.stats.no_desc;
}

static const struct ethtool_ops ipoib_ethtool_ops = {
        .get_drvinfo            = ipoib_get_drvinfo,
        .get_rx_csum            = ipoib_get_rx_csum,
        .get_coalesce           = ipoib_get_coalesce,
        .set_coalesce           = ipoib_set_coalesce,
        .get_flags              = ethtool_op_get_flags,
        .set_flags              = ethtool_op_set_flags,
        .get_strings            = ipoib_get_strings,
        .get_sset_count         = ipoib_get_sset_count,
        .get_ethtool_stats      = ipoib_get_ethtool_stats,
};

void ipoib_set_ethtool_ops(if_t dev)
{
        SET_ETHTOOL_OPS(dev, &ipoib_ethtool_ops);
}