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.
- 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.
- Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/errno.hlinux/if_ether.hlinux/mlx4/cmd.hmlx4.h
Detected Declarations
function Copyrightfunction mlx4_do_sense_portsfunction mlx4_sense_portfunction mlx4_start_sensefunction mlx4_stop_sensefunction mlx4_sense_init
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
- Immediate include surface: `linux/errno.h`, `linux/if_ether.h`, `linux/mlx4/cmd.h`, `mlx4.h`.
- Detected declarations: `function Copyright`, `function mlx4_do_sense_ports`, `function mlx4_sense_port`, `function mlx4_start_sense`, `function mlx4_stop_sense`, `function mlx4_sense_init`.
- Atlas domain: Driver Families / drivers/net.
- Implementation status: source implementation candidate.
- Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.