linux-stable/drivers/net/mlx4/sense.c
Yevgeny Petrilin ab6dc30da5 mlx4: Sensing link type at device initialization
When bringing the port up, performing a SENSE_PORT command
To try and check to which physical link type (IB or Ethernet) the physical
port is connected.
In case there is no valid link partner, the port will come up as its
supported default.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-04-07 20:36:12 -07:00

156 lines
4.5 KiB
C

/*
* Copyright (c) 2007 Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <linux/errno.h>
#include <linux/if_ether.h>
#include <linux/mlx4/cmd.h>
#include "mlx4.h"
int mlx4_SENSE_PORT(struct mlx4_dev *dev, int port,
enum mlx4_port_type *type)
{
u64 out_param;
int err = 0;
err = mlx4_cmd_imm(dev, 0, &out_param, port, 0,
MLX4_CMD_SENSE_PORT, MLX4_CMD_TIME_CLASS_B);
if (err) {
mlx4_err(dev, "Sense command failed for port: %d\n", port);
return err;
}
if (out_param > 2) {
mlx4_err(dev, "Sense returned illegal value: 0x%llx\n", out_param);
return -EINVAL;
}
*type = out_param;
return 0;
}
void mlx4_do_sense_ports(struct mlx4_dev *dev,
enum mlx4_port_type *stype,
enum mlx4_port_type *defaults)
{
struct mlx4_sense *sense = &mlx4_priv(dev)->sense;
int err;
int i;
for (i = 1; i <= dev->caps.num_ports; i++) {
stype[i - 1] = 0;
if (sense->do_sense_port[i] && sense->sense_allowed[i] &&
dev->caps.possible_type[i] == MLX4_PORT_TYPE_AUTO) {
err = mlx4_SENSE_PORT(dev, i, &stype[i - 1]);
if (err)
stype[i - 1] = defaults[i - 1];
} else
stype[i - 1] = defaults[i - 1];
}
/*
* Adjust port configuration:
* If port 1 sensed nothing and port 2 is IB, set both as IB
* If port 2 sensed nothing and port 1 is Eth, set both as Eth
*/
if (stype[0] == MLX4_PORT_TYPE_ETH) {
for (i = 1; i < dev->caps.num_ports; i++)
stype[i] = stype[i] ? stype[i] : MLX4_PORT_TYPE_ETH;
}
if (stype[dev->caps.num_ports - 1] == MLX4_PORT_TYPE_IB) {
for (i = 0; i < dev->caps.num_ports - 1; i++)
stype[i] = stype[i] ? stype[i] : MLX4_PORT_TYPE_IB;
}
/*
* If sensed nothing, remain in current configuration.
*/
for (i = 0; i < dev->caps.num_ports; i++)
stype[i] = stype[i] ? stype[i] : defaults[i];
}
static void mlx4_sense_port(struct work_struct *work)
{
struct delayed_work *delay = to_delayed_work(work);
struct mlx4_sense *sense = container_of(delay, struct mlx4_sense,
sense_poll);
struct mlx4_dev *dev = sense->dev;
struct mlx4_priv *priv = mlx4_priv(dev);
enum mlx4_port_type stype[MLX4_MAX_PORTS];
mutex_lock(&priv->port_mutex);
mlx4_do_sense_ports(dev, stype, &dev->caps.port_type[1]);
if (mlx4_check_port_params(dev, stype))
goto sense_again;
if (mlx4_change_port_types(dev, stype))
mlx4_err(dev, "Failed to change port_types\n");
sense_again:
mutex_unlock(&priv->port_mutex);
queue_delayed_work(mlx4_wq , &sense->sense_poll,
round_jiffies_relative(MLX4_SENSE_RANGE));
}
void mlx4_start_sense(struct mlx4_dev *dev)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_sense *sense = &priv->sense;
if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP))
return;
queue_delayed_work(mlx4_wq , &sense->sense_poll,
round_jiffies_relative(MLX4_SENSE_RANGE));
}
void mlx4_stop_sense(struct mlx4_dev *dev)
{
cancel_delayed_work_sync(&mlx4_priv(dev)->sense.sense_poll);
}
void mlx4_sense_init(struct mlx4_dev *dev)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_sense *sense = &priv->sense;
int port;
sense->dev = dev;
for (port = 1; port <= dev->caps.num_ports; port++)
sense->do_sense_port[port] = 1;
INIT_DELAYED_WORK_DEFERRABLE(&sense->sense_poll, mlx4_sense_port);
}