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 u32 ipoib_get_rx_csum(struct net_device *dev)
46 {
47 	struct ipoib_dev_priv *priv = netdev_priv(dev);
48 	return test_bit(IPOIB_FLAG_CSUM, &priv->flags) &&
49 		!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
50 }
51 
52 static int ipoib_set_tso(struct net_device *dev, u32 data)
53 {
54 	struct ipoib_dev_priv *priv = netdev_priv(dev);
55 
56 	if (data) {
57 		if (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
58 		    (dev->features & NETIF_F_SG) &&
59 		    (priv->hca_caps & IB_DEVICE_UD_TSO)) {
60 			dev->features |= NETIF_F_TSO;
61 		} else {
62 			ipoib_warn(priv, "can't set TSO on\n");
63 			return -EOPNOTSUPP;
64 		}
65 	} else
66 		dev->features &= ~NETIF_F_TSO;
67 
68 	return 0;
69 }
70 
71 static int ipoib_get_coalesce(struct net_device *dev,
72 			      struct ethtool_coalesce *coal)
73 {
74 	struct ipoib_dev_priv *priv = netdev_priv(dev);
75 
76 	coal->rx_coalesce_usecs = priv->ethtool.coalesce_usecs;
77 	coal->rx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
78 
79 	return 0;
80 }
81 
82 static int ipoib_set_coalesce(struct net_device *dev,
83 			      struct ethtool_coalesce *coal)
84 {
85 	struct ipoib_dev_priv *priv = netdev_priv(dev);
86 	int ret;
87 
88 	/*
89 	 * These values are saved in the private data and returned
90 	 * when ipoib_get_coalesce() is called
91 	 */
92 	if (coal->rx_coalesce_usecs       > 0xffff ||
93 	    coal->rx_max_coalesced_frames > 0xffff)
94 		return -EINVAL;
95 
96 	ret = ib_modify_cq(priv->recv_cq, coal->rx_max_coalesced_frames,
97 			   coal->rx_coalesce_usecs);
98 	if (ret && ret != -ENOSYS) {
99 		ipoib_warn(priv, "failed modifying CQ (%d)\n", ret);
100 		return ret;
101 	}
102 
103 	priv->ethtool.coalesce_usecs       = coal->rx_coalesce_usecs;
104 	priv->ethtool.max_coalesced_frames = coal->rx_max_coalesced_frames;
105 
106 	return 0;
107 }
108 
109 static const char ipoib_stats_keys[][ETH_GSTRING_LEN] = {
110 	"LRO aggregated", "LRO flushed",
111 	"LRO avg aggr", "LRO no desc"
112 };
113 
114 static void ipoib_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
115 {
116 	switch (stringset) {
117 	case ETH_SS_STATS:
118 		memcpy(data, *ipoib_stats_keys,	sizeof(ipoib_stats_keys));
119 		break;
120 	}
121 }
122 
123 static int ipoib_get_sset_count(struct net_device *dev, int sset)
124 {
125 	switch (sset) {
126 	case ETH_SS_STATS:
127 		return ARRAY_SIZE(ipoib_stats_keys);
128 	default:
129 		return -EOPNOTSUPP;
130 	}
131 }
132 
133 static void ipoib_get_ethtool_stats(struct net_device *dev,
134 				struct ethtool_stats *stats, uint64_t *data)
135 {
136 	struct ipoib_dev_priv *priv = netdev_priv(dev);
137 	int index = 0;
138 
139 	/* Get LRO statistics */
140 	data[index++] = priv->lro.lro_mgr.stats.aggregated;
141 	data[index++] = priv->lro.lro_mgr.stats.flushed;
142 	if (priv->lro.lro_mgr.stats.flushed)
143 		data[index++] = priv->lro.lro_mgr.stats.aggregated /
144 				priv->lro.lro_mgr.stats.flushed;
145 	else
146 		data[index++] = 0;
147 	data[index++] = priv->lro.lro_mgr.stats.no_desc;
148 }
149 
150 static const struct ethtool_ops ipoib_ethtool_ops = {
151 	.get_drvinfo		= ipoib_get_drvinfo,
152 	.get_rx_csum		= ipoib_get_rx_csum,
153 	.set_tso		= ipoib_set_tso,
154 	.get_coalesce		= ipoib_get_coalesce,
155 	.set_coalesce		= ipoib_set_coalesce,
156 	.get_flags		= ethtool_op_get_flags,
157 	.set_flags		= ethtool_op_set_flags,
158 	.get_strings		= ipoib_get_strings,
159 	.get_sset_count		= ipoib_get_sset_count,
160 	.get_ethtool_stats	= ipoib_get_ethtool_stats,
161 };
162 
163 void ipoib_set_ethtool_ops(struct net_device *dev)
164 {
165 	SET_ETHTOOL_OPS(dev, &ipoib_ethtool_ops);
166 }
167