release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/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
  41 static 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
  63 void 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
 104 static 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
 122 sense_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
 128 void 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
 140 void mlx4_stop_sense(struct mlx4_dev *dev)
 141 {
 142         cancel_delayed_work_sync(&mlx4_priv(dev)->sense.sense_poll);
 143 }
 144
 145 void  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 }