ipoib_ethtool.c

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/*
 * 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 <linux/kernel.h>
#include <linux/ethtool.h>
#include <linux/netdevice.h>

#include "ipoib.h"

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

static int ipoib_get_coalesce(struct net_device *dev,
                  struct ethtool_coalesce *coal)
{
    struct ipoib_dev_priv *priv = netdev_priv(dev);

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

    return 0;
}

static int ipoib_set_coalesce(struct net_device *dev,
                  struct ethtool_coalesce *coal)
{
    struct ipoib_dev_priv *priv = netdev_priv(dev);
    int ret;

    /*
     * 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;

    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;
    }

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

    return 0;
}

static const struct ethtool_ops ipoib_ethtool_ops = {
    .get_drvinfo        = ipoib_get_drvinfo,
    .get_coalesce       = ipoib_get_coalesce,
    .set_coalesce       = ipoib_set_coalesce,
};

void ipoib_set_ethtool_ops(struct net_device *dev)
{
    SET_ETHTOOL_OPS(dev, &ipoib_ethtool_ops);
}