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->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 }
100