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	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	queue_delayed_work(mlx4_wq , &sense->sense_poll,
125			   round_jiffies_relative(MLX4_SENSE_RANGE));
126}
127
128void mlx4_start_sense(struct mlx4_dev *dev)
129{
130	struct mlx4_priv *priv = mlx4_priv(dev);
131	struct mlx4_sense *sense = &priv->sense;
132
133	if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP))
134		return;
135
136	queue_delayed_work(mlx4_wq , &sense->sense_poll,
137			   round_jiffies_relative(MLX4_SENSE_RANGE));
138}
139
140void mlx4_stop_sense(struct mlx4_dev *dev)
141{
142	cancel_delayed_work_sync(&mlx4_priv(dev)->sense.sense_poll);
143}
144
145void  mlx4_sense_init(struct mlx4_dev *dev)
146{
147	struct mlx4_priv *priv = mlx4_priv(dev);
148	struct mlx4_sense *sense = &priv->sense;
149	int port;
150
151	sense->dev = dev;
152	for (port = 1; port <= dev->caps.num_ports; port++)
153		sense->do_sense_port[port] = 1;
154
155	INIT_DELAYED_WORK_DEFERRABLE(&sense->sense_poll, mlx4_sense_port);
156}