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 
34 #include <linux/kernel.h>
35 #include <linux/ethtool.h>
36 #include <linux/netdevice.h>
37 #include <linux/delay.h>
38 #include <linux/mlx4/driver.h>
39 
40 #include "mlx4_en.h"
41 
42 
43 static int mlx4_en_test_registers(struct mlx4_en_priv *priv)
44 {
45 	return mlx4_cmd(priv->mdev->dev, 0, 0, 0, MLX4_CMD_HW_HEALTH_CHECK,
46 			MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
47 }
48 
49 static int mlx4_en_test_loopback_xmit(struct mlx4_en_priv *priv)
50 {
51 	struct sk_buff *skb;
52 	struct ethhdr *ethh;
53 	unsigned char *packet;
54 	unsigned int packet_size = MLX4_LOOPBACK_TEST_PAYLOAD;
55 	unsigned int i;
56 	int err;
57 
58 
59 	/* build the pkt before xmit */
60 	skb = netdev_alloc_skb(priv->dev, MLX4_LOOPBACK_TEST_PAYLOAD + ETH_HLEN + NET_IP_ALIGN);
61 	if (!skb) {
62 		en_err(priv, "-LOOPBACK_TEST_XMIT- failed to create skb for xmit\n");
63 		return -ENOMEM;
64 	}
65 	skb_reserve(skb, NET_IP_ALIGN);
66 
67 	ethh = (struct ethhdr *)skb_put(skb, sizeof(struct ethhdr));
68 	packet	= (unsigned char *)skb_put(skb, packet_size);
69 	memcpy(ethh->h_dest, priv->dev->dev_addr, ETH_ALEN);
70 	memset(ethh->h_source, 0, ETH_ALEN);
71 	ethh->h_proto = htons(ETH_P_ARP);
72 	skb_set_mac_header(skb, 0);
73 	for (i = 0; i < packet_size; ++i)	/* fill our packet */
74 		packet[i] = (unsigned char)(i & 0xff);
75 
76 	/* xmit the pkt */
77 	err = mlx4_en_xmit(skb, priv->dev);
78 	return err;
79 }
80 
81 static int mlx4_en_test_loopback(struct mlx4_en_priv *priv)
82 {
83 	u32 loopback_ok = 0;
84 	int i;
85 
86 
87         priv->loopback_ok = 0;
88 	priv->validate_loopback = 1;
89 
90 	/* xmit */
91 	if (mlx4_en_test_loopback_xmit(priv)) {
92 		en_err(priv, "Transmitting loopback packet failed\n");
93 		goto mlx4_en_test_loopback_exit;
94 	}
95 
96 	/* polling for result */
97 	for (i = 0; i < MLX4_EN_LOOPBACK_RETRIES; ++i) {
98 		msleep(MLX4_EN_LOOPBACK_TIMEOUT);
99 		if (priv->loopback_ok) {
100 			loopback_ok = 1;
101 			break;
102 		}
103 	}
104 	if (!loopback_ok)
105 		en_err(priv, "Loopback packet didn't arrive\n");
106 
107 mlx4_en_test_loopback_exit:
108 
109 	priv->validate_loopback = 0;
110 	return !loopback_ok;
111 }
112 
113 
114 static int mlx4_en_test_link(struct mlx4_en_priv *priv)
115 {
116 	if (mlx4_en_QUERY_PORT(priv->mdev, priv->port))
117 		return -ENOMEM;
118 	if (priv->port_state.link_state == 1)
119 		return 0;
120 	else
121 		return 1;
122 }
123 
124 static int mlx4_en_test_speed(struct mlx4_en_priv *priv)
125 {
126 
127 	if (mlx4_en_QUERY_PORT(priv->mdev, priv->port))
128 		return -ENOMEM;
129 
130 	/* The device currently only supports 10G speed */
131 	if (priv->port_state.link_speed != SPEED_10000)
132 		return priv->port_state.link_speed;
133 	return 0;
134 }
135 
136 
137 void mlx4_en_ex_selftest(struct net_device *dev, u32 *flags, u64 *buf)
138 {
139 	struct mlx4_en_priv *priv = netdev_priv(dev);
140 	struct mlx4_en_dev *mdev = priv->mdev;
141 	struct mlx4_en_tx_ring *tx_ring;
142 	int i, carrier_ok;
143 
144 	memset(buf, 0, sizeof(u64) * MLX4_EN_NUM_SELF_TEST);
145 
146 	if (*flags & ETH_TEST_FL_OFFLINE) {
147 		/* disable the interface */
148 		carrier_ok = netif_carrier_ok(dev);
149 
150 		netif_carrier_off(dev);
151 retry_tx:
152 		/* Wait until all tx queues are empty.
153 		 * there should not be any additional incoming traffic
154 		 * since we turned the carrier off */
155 		msleep(200);
156 		for (i = 0; i < priv->tx_ring_num && carrier_ok; i++) {
157 			tx_ring = &priv->tx_ring[i];
158 			if (tx_ring->prod != (tx_ring->cons + tx_ring->last_nr_txbb))
159 				goto retry_tx;
160 		}
161 
162 		if (priv->mdev->dev->caps.flags &
163 					MLX4_DEV_CAP_FLAG_UC_LOOPBACK) {
164 			buf[3] = mlx4_en_test_registers(priv);
165 			buf[4] = mlx4_en_test_loopback(priv);
166 		}
167 
168 		if (carrier_ok)
169 			netif_carrier_on(dev);
170 
171 	}
172 	buf[0] = mlx4_test_interrupts(mdev->dev);
173 	buf[1] = mlx4_en_test_link(priv);
174 	buf[2] = mlx4_en_test_speed(priv);
175 
176 	for (i = 0; i < MLX4_EN_NUM_SELF_TEST; i++) {
177 		if (buf[i])
178 			*flags |= ETH_TEST_FL_FAILED;
179 	}
180 }
181