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 	IPOIB_NETDEV_STAT(multicast),
57 };
58 
59 #define IPOIB_GLOBAL_STATS_LEN	ARRAY_SIZE(ipoib_gstrings_stats)
60 
61 static void ipoib_get_drvinfo(struct net_device *netdev,
62 			      struct ethtool_drvinfo *drvinfo)
63 {
64 	struct ipoib_dev_priv *priv = ipoib_priv(netdev);
65 
66 	ib_get_device_fw_str(priv->ca, drvinfo->fw_version);
67 
68 	strlcpy(drvinfo->bus_info, dev_name(priv->ca->dev.parent),
69 		sizeof(drvinfo->bus_info));
70 
71 	strlcpy(drvinfo->driver, "ib_ipoib", sizeof(drvinfo->driver));
72 }
73 
74 static int ipoib_get_coalesce(struct net_device *dev,
75 			      struct ethtool_coalesce *coal)
76 {
77 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
78 
79 	coal->rx_coalesce_usecs = priv->ethtool.coalesce_usecs;
80 	coal->rx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
81 
82 	return 0;
83 }
84 
85 static int ipoib_set_coalesce(struct net_device *dev,
86 			      struct ethtool_coalesce *coal)
87 {
88 	struct ipoib_dev_priv *priv = ipoib_priv(dev);
89 	int ret;
90 
91 	/*
92 	 * These values are saved in the private data and returned
93 	 * when ipoib_get_coalesce() is called
94 	 */
95 	if (coal->rx_coalesce_usecs       > 0xffff ||
96 	    coal->rx_max_coalesced_frames > 0xffff)
97 		return -EINVAL;
98 
99 	ret = rdma_set_cq_moderation(priv->recv_cq,
100 				     coal->rx_max_coalesced_frames,
101 				     coal->rx_coalesce_usecs);
102 	if (ret && ret != -EOPNOTSUPP) {
103 		ipoib_warn(priv, "failed modifying CQ (%d)\n", ret);
104 		return ret;
105 	}
106 
107 	priv->ethtool.coalesce_usecs       = coal->rx_coalesce_usecs;
108 	priv->ethtool.max_coalesced_frames = coal->rx_max_coalesced_frames;
109 
110 	return 0;
111 }
112 static void ipoib_get_ethtool_stats(struct net_device *dev,
113 				    struct ethtool_stats __always_unused *stats,
114 				    u64 *data)
115 {
116 	int i;
117 	struct net_device_stats *net_stats = &dev->stats;
118 	u8 *p = (u8 *)net_stats;
119 
120 	for (i = 0; i < IPOIB_GLOBAL_STATS_LEN; i++)
121 		data[i] = *(u64 *)(p + ipoib_gstrings_stats[i].stat_offset);
122 
123 }
124 static void ipoib_get_strings(struct net_device __always_unused *dev,
125 			      u32 stringset, u8 *data)
126 {
127 	u8 *p = data;
128 	int i;
129 
130 	switch (stringset) {
131 	case ETH_SS_STATS:
132 		for (i = 0; i < IPOIB_GLOBAL_STATS_LEN; i++) {
133 			memcpy(p, ipoib_gstrings_stats[i].stat_string,
134 				ETH_GSTRING_LEN);
135 			p += ETH_GSTRING_LEN;
136 		}
137 		break;
138 	default:
139 		break;
140 	}
141 }
142 static int ipoib_get_sset_count(struct net_device __always_unused *dev,
143 				 int sset)
144 {
145 	switch (sset) {
146 	case ETH_SS_STATS:
147 		return IPOIB_GLOBAL_STATS_LEN;
148 	default:
149 		break;
150 	}
151 	return -EOPNOTSUPP;
152 }
153 
154 /* Return lane speed in unit of 1e6 bit/sec */
155 static inline int ib_speed_enum_to_int(int speed)
156 {
157 	switch (speed) {
158 	case IB_SPEED_SDR:
159 		return SPEED_2500;
160 	case IB_SPEED_DDR:
161 		return SPEED_5000;
162 	case IB_SPEED_QDR:
163 	case IB_SPEED_FDR10:
164 		return SPEED_10000;
165 	case IB_SPEED_FDR:
166 		return SPEED_14000;
167 	case IB_SPEED_EDR:
168 		return SPEED_25000;
169 	}
170 
171 	return SPEED_UNKNOWN;
172 }
173 
174 static int ipoib_get_link_ksettings(struct net_device *netdev,
175 				    struct ethtool_link_ksettings *cmd)
176 {
177 	struct ipoib_dev_priv *priv = ipoib_priv(netdev);
178 	struct ib_port_attr attr;
179 	int ret, speed, width;
180 
181 	if (!netif_carrier_ok(netdev)) {
182 		cmd->base.speed = SPEED_UNKNOWN;
183 		cmd->base.duplex = DUPLEX_UNKNOWN;
184 		return 0;
185 	}
186 
187 	ret = ib_query_port(priv->ca, priv->port, &attr);
188 	if (ret < 0)
189 		return -EINVAL;
190 
191 	speed = ib_speed_enum_to_int(attr.active_speed);
192 	width = ib_width_enum_to_int(attr.active_width);
193 
194 	if (speed < 0 || width < 0)
195 		return -EINVAL;
196 
197 	/* Except the following are set, the other members of
198 	 * the struct ethtool_link_settings are initialized to
199 	 * zero in the function __ethtool_get_link_ksettings.
200 	 */
201 	cmd->base.speed		 = speed * width;
202 	cmd->base.duplex	 = DUPLEX_FULL;
203 
204 	cmd->base.phy_address	 = 0xFF;
205 
206 	cmd->base.autoneg	 = AUTONEG_ENABLE;
207 	cmd->base.port		 = PORT_OTHER;
208 
209 	return 0;
210 }
211 
212 static const struct ethtool_ops ipoib_ethtool_ops = {
213 	.supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS |
214 				     ETHTOOL_COALESCE_RX_MAX_FRAMES,
215 	.get_link_ksettings	= ipoib_get_link_ksettings,
216 	.get_drvinfo		= ipoib_get_drvinfo,
217 	.get_coalesce		= ipoib_get_coalesce,
218 	.set_coalesce		= ipoib_set_coalesce,
219 	.get_strings		= ipoib_get_strings,
220 	.get_ethtool_stats	= ipoib_get_ethtool_stats,
221 	.get_sset_count		= ipoib_get_sset_count,
222 	.get_link		= ethtool_op_get_link,
223 };
224 
225 void ipoib_set_ethtool_ops(struct net_device *dev)
226 {
227 	dev->ethtool_ops = &ipoib_ethtool_ops;
228 }
229