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/errno.h>
35 #include <linux/if_ether.h>
36 
37 #include <linux/mlx4/cmd.h>
38 
39 #include "mlx4.h"
40 
41 int mlx4_SENSE_PORT(struct mlx4_dev *dev, int port,
42 		    enum mlx4_port_type *type)
43 {
44 	u64 out_param;
45 	int err = 0;
46 
47 	err = mlx4_cmd_imm(dev, 0, &out_param, port, 0,
48 			   MLX4_CMD_SENSE_PORT, MLX4_CMD_TIME_CLASS_B,
49 			   MLX4_CMD_WRAPPED);
50 	if (err) {
51 		mlx4_err(dev, "Sense command failed for port: %d\n", port);
52 		return err;
53 	}
54 
55 	if (out_param > 2) {
56 		mlx4_err(dev, "Sense returned illegal value: 0x%llx\n", out_param);
57 		return -EINVAL;
58 	}
59 
60 	*type = out_param;
61 	return 0;
62 }
63 
64 void mlx4_do_sense_ports(struct mlx4_dev *dev,
65 			 enum mlx4_port_type *stype,
66 			 enum mlx4_port_type *defaults)
67 {
68 	struct mlx4_sense *sense = &mlx4_priv(dev)->sense;
69 	int err;
70 	int i;
71 
72 	for (i = 1; i <= dev->caps.num_ports; i++) {
73 		stype[i - 1] = 0;
74 		if (sense->do_sense_port[i] && sense->sense_allowed[i] &&
75 		    dev->caps.possible_type[i] == MLX4_PORT_TYPE_AUTO) {
76 			err = mlx4_SENSE_PORT(dev, i, &stype[i - 1]);
77 			if (err)
78 				stype[i - 1] = defaults[i - 1];
79 		} else
80 			stype[i - 1] = defaults[i - 1];
81 	}
82 
83 	/*
84 	 * If sensed nothing, remain in current configuration.
85 	 */
86 	for (i = 0; i < dev->caps.num_ports; i++)
87 		stype[i] = stype[i] ? stype[i] : defaults[i];
88 
89 }
90 
91 static void mlx4_sense_port(struct work_struct *work)
92 {
93 	struct delayed_work *delay = to_delayed_work(work);
94 	struct mlx4_sense *sense = container_of(delay, struct mlx4_sense,
95 						sense_poll);
96 	struct mlx4_dev *dev = sense->dev;
97 	struct mlx4_priv *priv = mlx4_priv(dev);
98 	enum mlx4_port_type stype[MLX4_MAX_PORTS];
99 
100 	mutex_lock(&priv->port_mutex);
101 	mlx4_do_sense_ports(dev, stype, &dev->caps.port_type[1]);
102 
103 	if (mlx4_check_port_params(dev, stype))
104 		goto sense_again;
105 
106 	if (mlx4_change_port_types(dev, stype))
107 		mlx4_err(dev, "Failed to change port_types\n");
108 
109 sense_again:
110 	mutex_unlock(&priv->port_mutex);
111 	queue_delayed_work(mlx4_wq , &sense->sense_poll,
112 			   round_jiffies_relative(MLX4_SENSE_RANGE));
113 }
114 
115 void mlx4_start_sense(struct mlx4_dev *dev)
116 {
117 	struct mlx4_priv *priv = mlx4_priv(dev);
118 	struct mlx4_sense *sense = &priv->sense;
119 
120 	if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP))
121 		return;
122 
123 	queue_delayed_work(mlx4_wq , &sense->sense_poll,
124 			   round_jiffies_relative(MLX4_SENSE_RANGE));
125 }
126 
127 void mlx4_stop_sense(struct mlx4_dev *dev)
128 {
129 	cancel_delayed_work_sync(&mlx4_priv(dev)->sense.sense_poll);
130 }
131 
132 void  mlx4_sense_init(struct mlx4_dev *dev)
133 {
134 	struct mlx4_priv *priv = mlx4_priv(dev);
135 	struct mlx4_sense *sense = &priv->sense;
136 	int port;
137 
138 	sense->dev = dev;
139 	for (port = 1; port <= dev->caps.num_ports; port++)
140 		sense->do_sense_port[port] = 1;
141 
142 	INIT_DEFERRABLE_WORK(&sense->sense_poll, mlx4_sense_port);
143 }
144