sense.c revision 219820 
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
41static 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	if (err) {
50		mlx4_err(dev, "Sense command failed for port: %d\n", port);
51		return err;
52	}
53
54	if (out_param > 2) {
55		mlx4_err(dev, "Sense returned illegal value: 0x%llx\n", out_param);
56		return EINVAL;
57	}
58
59	*type = out_param;
60	return 0;
61}
62
63void mlx4_do_sense_ports(struct mlx4_dev *dev,
64			 enum mlx4_port_type *stype,
65			 enum mlx4_port_type *defaults)
66{
67	struct mlx4_sense *sense = &mlx4_priv(dev)->sense;
68	int err;
69	int i;
70
71	for (i = 1; i <= dev->caps.num_ports; i++) {
72		stype[i - 1] = 0;
73		if (sense->do_sense_port[i] && sense->sense_allowed[i] &&
74		    dev->caps.possible_type[i] == MLX4_PORT_TYPE_AUTO) {
75			err = mlx4_SENSE_PORT(dev, i, &stype[i - 1]);
76			if (err)
77				stype[i - 1] = defaults[i - 1];
78		} else
79			stype[i - 1] = defaults[i - 1];
80	}
81
82	/*
83	 * Adjust port configuration:
84	 * If port 1 sensed nothing and port 2 is IB, set both as IB
85	 * If port 2 sensed nothing and port 1 is Eth, set both as Eth
86	 */
87	if (stype[0] == MLX4_PORT_TYPE_ETH) {
88		for (i = 1; i < dev->caps.num_ports; i++)
89			stype[i] = stype[i] ? stype[i] : MLX4_PORT_TYPE_ETH;
90	}
91	if (stype[dev->caps.num_ports - 1] == MLX4_PORT_TYPE_IB) {
92		for (i = 0; i < dev->caps.num_ports - 1; i++)
93			stype[i] = stype[i] ? stype[i] : MLX4_PORT_TYPE_IB;
94	}
95
96	/*
97	 * If sensed nothing, remain in current configuration.
98	 */
99	for (i = 0; i < dev->caps.num_ports; i++)
100		stype[i] = stype[i] ? stype[i] : defaults[i];
101
102}
103
104static void mlx4_sense_port(struct work_struct *work)
105{
106	struct delayed_work *delay = to_delayed_work(work);
107	struct mlx4_sense *sense = container_of(delay, struct mlx4_sense,
108						sense_poll);
109	struct mlx4_dev *dev = sense->dev;
110	struct mlx4_priv *priv = mlx4_priv(dev);
111	enum mlx4_port_type stype[MLX4_MAX_PORTS];
112
113	mutex_lock(&priv->port_mutex);
114	mlx4_do_sense_ports(dev, stype, &dev->caps.port_type[1]);
115
116	if (mlx4_check_port_params(dev, stype))
117		goto sense_again;
118
119	if (mlx4_change_port_types(dev, stype))
120		mlx4_err(dev, "Failed to change port_types\n");
121
122sense_again:
123	mutex_unlock(&priv->port_mutex);
124	if (sense->resched)
125		queue_delayed_work(sense->sense_wq , &sense->sense_poll,
126				   round_jiffies(MLX4_SENSE_RANGE));
127}
128
129void mlx4_start_sense(struct mlx4_dev *dev)
130{
131	struct mlx4_priv *priv = mlx4_priv(dev);
132	struct mlx4_sense *sense = &priv->sense;
133
134	if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP))
135		return;
136
137	sense->resched = 1;
138	queue_delayed_work(sense->sense_wq , &sense->sense_poll,
139			   round_jiffies(MLX4_SENSE_RANGE));
140}
141
142
143void mlx4_stop_sense(struct mlx4_dev *dev)
144{
145	mlx4_priv(dev)->sense.resched = 0;
146}
147
148int mlx4_sense_init(struct mlx4_dev *dev)
149{
150	struct mlx4_priv *priv = mlx4_priv(dev);
151	struct mlx4_sense *sense = &priv->sense;
152	int port;
153
154	sense->dev = dev;
155	sense->sense_wq = create_singlethread_workqueue("mlx4_sense");
156	if (!sense->sense_wq)
157		return -ENOMEM;
158
159	for (port = 1; port <= dev->caps.num_ports; port++)
160		sense->do_sense_port[port] = 1;
161
162	INIT_DELAYED_WORK_DEFERRABLE(&sense->sense_poll, mlx4_sense_port);
163	return 0;
164}
165
166void mlx4_sense_cleanup(struct mlx4_dev *dev)
167{
168	mlx4_stop_sense(dev);
169	cancel_delayed_work(&mlx4_priv(dev)->sense.sense_poll);
170	destroy_workqueue(mlx4_priv(dev)->sense.sense_wq);
171}
172
173