LXR linux/drivers/net/ethernet/mellanox/mlx4/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}
 144