drivers/net/ethernet/mellanox/mlx5/core/en_dim.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/mellanox/mlx5/core/en_dim.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/mellanox/mlx5/core/en_dim.c
Extension
.c
Size
4109 bytes
Lines
150
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 "en.h"
#include "en/dim.h"

static void
mlx5e_complete_dim_work(struct dim *dim, struct dim_cq_moder moder,
			struct mlx5_core_dev *mdev, struct mlx5_core_cq *mcq)
{
	mlx5e_modify_cq_moderation(mdev, mcq, moder.usec, moder.pkts,
				   mlx5e_cq_period_mode(moder.cq_period_mode));
	dim->state = DIM_START_MEASURE;
}

void mlx5e_rx_dim_work(struct work_struct *work)
{
	struct dim *dim = container_of(work, struct dim, work);
	struct mlx5e_rq *rq = dim->priv;
	struct dim_cq_moder cur_moder =
		net_dim_get_rx_moderation(dim->mode, dim->profile_ix);

	mlx5e_complete_dim_work(dim, cur_moder, rq->mdev, &rq->cq.mcq);
}

void mlx5e_tx_dim_work(struct work_struct *work)
{
	struct dim *dim = container_of(work, struct dim, work);
	struct mlx5e_txqsq *sq = dim->priv;
	struct dim_cq_moder cur_moder =
		net_dim_get_tx_moderation(dim->mode, dim->profile_ix);

	mlx5e_complete_dim_work(dim, cur_moder, sq->cq.mdev, &sq->cq.mcq);
}

static struct dim *mlx5e_dim_enable(struct mlx5_core_dev *mdev,
				    void (*work_fun)(struct work_struct *), int cpu,
				    u8 cq_period_mode, struct mlx5_core_cq *mcq,
				    void *queue)
{
	struct dim *dim;
	int err;

	dim = kvzalloc_node(sizeof(*dim), GFP_KERNEL, cpu_to_node(cpu));
	if (!dim)
		return ERR_PTR(-ENOMEM);

	INIT_WORK(&dim->work, work_fun);

	dim->mode = cq_period_mode;
	dim->priv = queue;

	err = mlx5e_modify_cq_period_mode(mdev, mcq, dim->mode);
	if (err) {
		kvfree(dim);
		return ERR_PTR(err);
	}

	return dim;
}

static void mlx5e_dim_disable(struct dim *dim)
{
	cancel_work_sync(&dim->work);
	kvfree(dim);
}

int mlx5e_dim_rx_change(struct mlx5e_rq *rq, bool enable)
{
	if (enable == !!rq->dim)
		return 0;

	if (enable) {
		struct mlx5e_channel *c = rq->channel;
		struct dim *dim;

		dim = mlx5e_dim_enable(rq->mdev, mlx5e_rx_dim_work, c->cpu,
				       c->rx_cq_moder.cq_period_mode, &rq->cq.mcq, rq);
		if (IS_ERR(dim))
			return PTR_ERR(dim);

		rq->dim = dim;

		__set_bit(MLX5E_RQ_STATE_DIM, &rq->state);
	} else {
		__clear_bit(MLX5E_RQ_STATE_DIM, &rq->state);
		synchronize_net();
		mlx5e_dim_disable(rq->dim);
		rq->dim = NULL;
	}

	return 0;
}

Annotation

Implementation Notes