drivers/net/ethernet/mellanox/mlx4/icm.h

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/mellanox/mlx4/icm.h

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/mellanox/mlx4/icm.h
Extension
.h
Size
4441 bytes
Lines
145
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

struct mlx4_icm_buf {
	void			*addr;
	size_t			size;
	dma_addr_t		dma_addr;
};

struct mlx4_icm_chunk {
	struct list_head	list;
	int			npages;
	int			nsg;
	bool			coherent;
	union {
		struct scatterlist	sg[MLX4_ICM_CHUNK_LEN];
		struct mlx4_icm_buf	buf[MLX4_ICM_CHUNK_LEN];
	};
};

struct mlx4_icm {
	struct list_head	chunk_list;
	int			refcount;
};

struct mlx4_icm_iter {
	struct mlx4_icm	       *icm;
	struct mlx4_icm_chunk  *chunk;
	int			page_idx;
};

struct mlx4_dev;

struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
				gfp_t gfp_mask, int coherent);
void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent);

int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
			 u32 start, u32 end);
void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
			  u32 start, u32 end);
int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
			u64 virt, int obj_size,	u32 nobj, int reserved,
			int use_lowmem, int use_coherent);
void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table);
void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle);

static inline void mlx4_icm_first(struct mlx4_icm *icm,
				  struct mlx4_icm_iter *iter)
{
	iter->icm      = icm;
	iter->chunk    = list_empty(&icm->chunk_list) ?
		NULL : list_entry(icm->chunk_list.next,
				  struct mlx4_icm_chunk, list);
	iter->page_idx = 0;
}

static inline int mlx4_icm_last(struct mlx4_icm_iter *iter)
{
	return !iter->chunk;
}

static inline void mlx4_icm_next(struct mlx4_icm_iter *iter)
{
	if (++iter->page_idx >= iter->chunk->nsg) {
		if (iter->chunk->list.next == &iter->icm->chunk_list) {
			iter->chunk = NULL;
			return;
		}

		iter->chunk = list_entry(iter->chunk->list.next,
					 struct mlx4_icm_chunk, list);
		iter->page_idx = 0;
	}
}

static inline dma_addr_t mlx4_icm_addr(struct mlx4_icm_iter *iter)
{
	if (iter->chunk->coherent)
		return iter->chunk->buf[iter->page_idx].dma_addr;
	else
		return sg_dma_address(&iter->chunk->sg[iter->page_idx]);
}

static inline unsigned long mlx4_icm_size(struct mlx4_icm_iter *iter)
{
	if (iter->chunk->coherent)
		return iter->chunk->buf[iter->page_idx].size;
	else
		return sg_dma_len(&iter->chunk->sg[iter->page_idx]);
}

Annotation

Implementation Notes