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
39static void ipoib_get_drvinfo(struct ifnet *netdev,
40			      struct ethtool_drvinfo *drvinfo)
41{
42	strncpy(drvinfo->driver, "ipoib", sizeof(drvinfo->driver) - 1);
43}
44
45static u32 ipoib_get_rx_csum(struct ifnet *dev)
46{
47	struct ipoib_dev_priv *priv = dev->if_softc;
48	return test_bit(IPOIB_FLAG_CSUM, &priv->flags) &&
49		!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
50}
51
52static int ipoib_get_coalesce(struct ifnet *dev,
53			      struct ethtool_coalesce *coal)
54{
55	struct ipoib_dev_priv *priv = dev->if_softc;
56
57	coal->rx_coalesce_usecs = priv->ethtool.coalesce_usecs;
58	coal->tx_coalesce_usecs = priv->ethtool.coalesce_usecs;
59	coal->rx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
60	coal->tx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
61
62	return 0;
63}
64
65static int ipoib_set_coalesce(struct ifnet *dev,
66			      struct ethtool_coalesce *coal)
67{
68	struct ipoib_dev_priv *priv = dev->if_softc;
69	int ret;
70
71	/*
72	 * Since IPoIB uses a single CQ for both rx and tx, we assume
73	 * that rx params dictate the configuration.  These values are
74	 * saved in the private data and returned when ipoib_get_coalesce()
75	 * is called.
76	 */
77	if (coal->rx_coalesce_usecs       > 0xffff ||
78	    coal->rx_max_coalesced_frames > 0xffff)
79		return -EINVAL;
80
81	if (coal->rx_max_coalesced_frames | coal->rx_coalesce_usecs) {
82		if (!coal->rx_max_coalesced_frames)
83			coal->rx_max_coalesced_frames = 0xffff;
84		else if (!coal->rx_coalesce_usecs)
85			coal->rx_coalesce_usecs = 0xffff;
86	}
87
88	ret = ib_modify_cq(priv->recv_cq, coal->rx_max_coalesced_frames,
89			   coal->rx_coalesce_usecs);
90	if (ret && ret != -ENOSYS) {
91		ipoib_warn(priv, "failed modifying CQ (%d)\n", ret);
92		return ret;
93	}
94
95	coal->tx_coalesce_usecs       = coal->rx_coalesce_usecs;
96	coal->tx_max_coalesced_frames = coal->rx_max_coalesced_frames;
97	priv->ethtool.coalesce_usecs       = coal->rx_coalesce_usecs;
98	priv->ethtool.max_coalesced_frames = coal->rx_max_coalesced_frames;
99
100	return 0;
101}
102
103static const char ipoib_stats_keys[][ETH_GSTRING_LEN] = {
104	"LRO aggregated", "LRO flushed",
105	"LRO avg aggr", "LRO no desc"
106};
107
108static void ipoib_get_strings(struct ifnet *netdev, u32 stringset, u8 *data)
109{
110	switch (stringset) {
111	case ETH_SS_STATS:
112		memcpy(data, *ipoib_stats_keys,	sizeof(ipoib_stats_keys));
113		break;
114	}
115}
116
117static int ipoib_get_sset_count(struct ifnet *dev, int sset)
118{
119	switch (sset) {
120	case ETH_SS_STATS:
121		return ARRAY_SIZE(ipoib_stats_keys);
122	default:
123		return -EOPNOTSUPP;
124	}
125}
126
127static void ipoib_get_ethtool_stats(struct ifnet *dev,
128				struct ethtool_stats *stats, uint64_t *data)
129{
130	struct ipoib_dev_priv *priv = dev->if_softc;
131	int index = 0;
132
133	/* Get LRO statistics */
134	data[index++] = priv->lro.lro_mgr.stats.aggregated;
135	data[index++] = priv->lro.lro_mgr.stats.flushed;
136	if (priv->lro.lro_mgr.stats.flushed)
137		data[index++] = priv->lro.lro_mgr.stats.aggregated /
138				priv->lro.lro_mgr.stats.flushed;
139	else
140		data[index++] = 0;
141	data[index++] = priv->lro.lro_mgr.stats.no_desc;
142}
143
144static const struct ethtool_ops ipoib_ethtool_ops = {
145	.get_drvinfo		= ipoib_get_drvinfo,
146	.get_rx_csum		= ipoib_get_rx_csum,
147	.get_coalesce		= ipoib_get_coalesce,
148	.set_coalesce		= ipoib_set_coalesce,
149	.get_flags		= ethtool_op_get_flags,
150	.set_flags		= ethtool_op_set_flags,
151	.get_strings		= ipoib_get_strings,
152	.get_sset_count		= ipoib_get_sset_count,
153	.get_ethtool_stats	= ipoib_get_ethtool_stats,
154};
155
156void ipoib_set_ethtool_ops(struct ifnet *dev)
157{
158	SET_ETHTOOL_OPS(dev, &ipoib_ethtool_ops);
159}
160