forked from Minki/linux
28d52b3cd8
This can be used to tune at run time the parameters controlling the event (interrupt) generation rate and thus reduce the overhead incurred by handling interrupts resulting in better throughput. Since IPoIB uses a single CQ for both RX and TX, RX is chosen to dictate configuration for both RX and TX. Signed-off-by: Eli Cohen <eli@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
/*
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* Copyright (c) 2007 Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/kernel.h>
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#include <linux/ethtool.h>
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#include <linux/netdevice.h>
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#include "ipoib.h"
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static void ipoib_get_drvinfo(struct net_device *netdev,
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struct ethtool_drvinfo *drvinfo)
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{
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strncpy(drvinfo->driver, "ipoib", sizeof(drvinfo->driver) - 1);
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}
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static int ipoib_get_coalesce(struct net_device *dev,
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struct ethtool_coalesce *coal)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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coal->rx_coalesce_usecs = priv->ethtool.coalesce_usecs;
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coal->tx_coalesce_usecs = priv->ethtool.coalesce_usecs;
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coal->rx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
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coal->tx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
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return 0;
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}
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static int ipoib_set_coalesce(struct net_device *dev,
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struct ethtool_coalesce *coal)
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{
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struct ipoib_dev_priv *priv = netdev_priv(dev);
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int ret;
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/*
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* Since IPoIB uses a single CQ for both rx and tx, we assume
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* that rx params dictate the configuration. These values are
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* saved in the private data and returned when ipoib_get_coalesce()
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* is called.
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*/
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if (coal->rx_coalesce_usecs > 0xffff ||
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coal->rx_max_coalesced_frames > 0xffff)
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return -EINVAL;
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ret = ib_modify_cq(priv->cq, coal->rx_max_coalesced_frames,
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coal->rx_coalesce_usecs);
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if (ret && ret != -ENOSYS) {
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ipoib_warn(priv, "failed modifying CQ (%d)\n", ret);
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return ret;
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}
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coal->tx_coalesce_usecs = coal->rx_coalesce_usecs;
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coal->tx_max_coalesced_frames = coal->rx_max_coalesced_frames;
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priv->ethtool.coalesce_usecs = coal->rx_coalesce_usecs;
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priv->ethtool.max_coalesced_frames = coal->rx_max_coalesced_frames;
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return 0;
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}
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static const struct ethtool_ops ipoib_ethtool_ops = {
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.get_drvinfo = ipoib_get_drvinfo,
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.get_tso = ethtool_op_get_tso,
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.get_coalesce = ipoib_get_coalesce,
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.set_coalesce = ipoib_set_coalesce,
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};
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void ipoib_set_ethtool_ops(struct net_device *dev)
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{
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SET_ETHTOOL_OPS(dev, &ipoib_ethtool_ops);
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}
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