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 struct ipoib_stats {
40 	char stat_string[ETH_GSTRING_LEN];
41 	int stat_offset;
42 };
43 
44 #define IPOIB_NETDEV_STAT(m) { \
45 		.stat_string = #m, \
46 		.stat_offset = offsetof(struct rtnl_link_stats64, m) }
47 
48 static const struct ipoib_stats ipoib_gstrings_stats[] = {
49 	IPOIB_NETDEV_STAT(rx_packets),
50 	IPOIB_NETDEV_STAT(tx_packets),
51 	IPOIB_NETDEV_STAT(rx_bytes),
52 	IPOIB_NETDEV_STAT(tx_bytes),
53 	IPOIB_NETDEV_STAT(tx_errors),
54 	IPOIB_NETDEV_STAT(rx_dropped),
55 	IPOIB_NETDEV_STAT(tx_dropped)
56 };
57 
58 #define IPOIB_GLOBAL_STATS_LEN	ARRAY_SIZE(ipoib_gstrings_stats)
59 
60 static void ipoib_get_drvinfo(struct net_device *netdev,
61 			      struct ethtool_drvinfo *drvinfo)
62 {
63 	struct ipoib_dev_priv *priv = netdev_priv(netdev);
64 
65 	snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
66 		 "%d.%d.%d", (int)(priv->ca->attrs.fw_ver >> 32),
67 		 (int)(priv->ca->attrs.fw_ver >> 16) & 0xffff,
68 		 (int)priv->ca->attrs.fw_ver & 0xffff);
69 
70 	strlcpy(drvinfo->bus_info, dev_name(priv->ca->dma_device),
71 		sizeof(drvinfo->bus_info));
72 
73 	strlcpy(drvinfo->version, ipoib_driver_version,
74 		sizeof(drvinfo->version));
75 
76 	strlcpy(drvinfo->driver, "ib_ipoib", sizeof(drvinfo->driver));
77 }
78 
79 static int ipoib_get_coalesce(struct net_device *dev,
80 			      struct ethtool_coalesce *coal)
81 {
82 	struct ipoib_dev_priv *priv = netdev_priv(dev);
83 
84 	coal->rx_coalesce_usecs = priv->ethtool.coalesce_usecs;
85 	coal->rx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
86 
87 	return 0;
88 }
89 
90 static int ipoib_set_coalesce(struct net_device *dev,
91 			      struct ethtool_coalesce *coal)
92 {
93 	struct ipoib_dev_priv *priv = netdev_priv(dev);
94 	int ret;
95 
96 	/*
97 	 * These values are saved in the private data and returned
98 	 * when ipoib_get_coalesce() is called
99 	 */
100 	if (coal->rx_coalesce_usecs       > 0xffff ||
101 	    coal->rx_max_coalesced_frames > 0xffff)
102 		return -EINVAL;
103 
104 	ret = ib_modify_cq(priv->recv_cq, coal->rx_max_coalesced_frames,
105 			   coal->rx_coalesce_usecs);
106 	if (ret && ret != -ENOSYS) {
107 		ipoib_warn(priv, "failed modifying CQ (%d)\n", ret);
108 		return ret;
109 	}
110 
111 	priv->ethtool.coalesce_usecs       = coal->rx_coalesce_usecs;
112 	priv->ethtool.max_coalesced_frames = coal->rx_max_coalesced_frames;
113 
114 	return 0;
115 }
116 static void ipoib_get_ethtool_stats(struct net_device *dev,
117 				    struct ethtool_stats __always_unused *stats,
118 				    u64 *data)
119 {
120 	int i;
121 	struct net_device_stats *net_stats = &dev->stats;
122 	u8 *p = (u8 *)net_stats;
123 
124 	for (i = 0; i < IPOIB_GLOBAL_STATS_LEN; i++)
125 		data[i] = *(u64 *)(p + ipoib_gstrings_stats[i].stat_offset);
126 
127 }
128 static void ipoib_get_strings(struct net_device __always_unused *dev,
129 			      u32 stringset, u8 *data)
130 {
131 	u8 *p = data;
132 	int i;
133 
134 	switch (stringset) {
135 	case ETH_SS_STATS:
136 		for (i = 0; i < IPOIB_GLOBAL_STATS_LEN; i++) {
137 			memcpy(p, ipoib_gstrings_stats[i].stat_string,
138 				ETH_GSTRING_LEN);
139 			p += ETH_GSTRING_LEN;
140 		}
141 		break;
142 	case ETH_SS_TEST:
143 	default:
144 		break;
145 	}
146 }
147 static int ipoib_get_sset_count(struct net_device __always_unused *dev,
148 				 int sset)
149 {
150 	switch (sset) {
151 	case ETH_SS_STATS:
152 		return IPOIB_GLOBAL_STATS_LEN;
153 	case ETH_SS_TEST:
154 	default:
155 		break;
156 	}
157 	return -EOPNOTSUPP;
158 }
159 
160 static const struct ethtool_ops ipoib_ethtool_ops = {
161 	.get_drvinfo		= ipoib_get_drvinfo,
162 	.get_coalesce		= ipoib_get_coalesce,
163 	.set_coalesce		= ipoib_set_coalesce,
164 	.get_strings		= ipoib_get_strings,
165 	.get_ethtool_stats	= ipoib_get_ethtool_stats,
166 	.get_sset_count		= ipoib_get_sset_count,
167 };
168 
169 void ipoib_set_ethtool_ops(struct net_device *dev)
170 {
171 	dev->ethtool_ops = &ipoib_ethtool_ops;
172 }
173