drivers/infiniband/ulp/ipoib/ipoib_ethtool.c

   1 /*
   2  * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/netdevice.h>
  36
  37 #include "ipoib.h"
  38
  39 static void ipoib_get_drvinfo(struct net_device *netdev,
  40                               struct ethtool_drvinfo *drvinfo)
  41 {
  42         strncpy(drvinfo->driver, "ipoib", sizeof(drvinfo->driver) - 1);
  43 }
  44
  45 static int ipoib_get_coalesce(struct net_device *dev,
  46                               struct ethtool_coalesce *coal)
  47 {
  48         struct ipoib_dev_priv *priv = netdev_priv(dev);
  49
  50         coal->rx_coalesce_usecs = priv->ethtool.coalesce_usecs;
  51         coal->tx_coalesce_usecs = priv->ethtool.coalesce_usecs;
  52         coal->rx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
  53         coal->tx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
  54
  55         return 0;
  56 }
  57
  58 static int ipoib_set_coalesce(struct net_device *dev,
  59                               struct ethtool_coalesce *coal)
  60 {
  61         struct ipoib_dev_priv *priv = netdev_priv(dev);
  62         int ret;
  63
  64         /*
  65          * Since IPoIB uses a single CQ for both rx and tx, we assume
  66          * that rx params dictate the configuration.  These values are
  67          * saved in the private data and returned when ipoib_get_coalesce()
  68          * is called.
  69          */
  70         if (coal->rx_coalesce_usecs       > 0xffff ||
  71             coal->rx_max_coalesced_frames > 0xffff)
  72                 return -EINVAL;
  73
  74         ret = ib_modify_cq(priv->recv_cq, coal->rx_max_coalesced_frames,
  75                            coal->rx_coalesce_usecs);
  76         if (ret && ret != -ENOSYS) {
  77                 ipoib_warn(priv, "failed modifying CQ (%d)\n", ret);
  78                 return ret;
  79         }
  80
  81         coal->tx_coalesce_usecs       = coal->rx_coalesce_usecs;
  82         coal->tx_max_coalesced_frames = coal->rx_max_coalesced_frames;
  83         priv->ethtool.coalesce_usecs       = coal->rx_coalesce_usecs;
  84         priv->ethtool.max_coalesced_frames = coal->rx_max_coalesced_frames;
  85
  86         return 0;
  87 }
  88
  89 static const struct ethtool_ops ipoib_ethtool_ops = {
  90         .get_drvinfo            = ipoib_get_drvinfo,
  91         .get_tso                = ethtool_op_get_tso,
  92         .get_coalesce           = ipoib_get_coalesce,
  93         .set_coalesce           = ipoib_set_coalesce,
  94 };
  95
  96 void ipoib_set_ethtool_ops(struct net_device *dev)
  97 {
  98         SET_ETHTOOL_OPS(dev, &ipoib_ethtool_ops);
  99 }