drivers/net/ethernet/mellanox/mlx4/sense.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/mellanox/mlx4/sense.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/mellanox/mlx4/sense.c
Extension
.c
Size
4126 bytes
Lines
144
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#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,
			   MLX4_CMD_WRAPPED);
	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];
	}

	/*
	 * 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,

Annotation

Implementation Notes