sense.c

  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
 41int 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
 64void 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
 91static 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
109sense_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
115void 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
127void mlx4_stop_sense(struct mlx4_dev *dev)
128{
129	cancel_delayed_work_sync(&mlx4_priv(dev)->sense.sense_poll);
130}
131
132void  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}