drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
Extension
.h
Size
16207 bytes
Lines
586
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 mlx5e_xmit_data {
	dma_addr_t  dma_addr;
	void       *data;
	u32         len : 31;
	u32         has_frags : 1;
};

struct mlx5e_xmit_data_frags {
	struct mlx5e_xmit_data xd;
	struct skb_shared_info *sinfo;
	dma_addr_t *dma_arr;
};

netdev_tx_t mlx5e_xmit(struct sk_buff *skb, struct net_device *dev);
bool mlx5e_poll_tx_cq(struct mlx5e_cq *cq, int napi_budget);
void mlx5e_free_txqsq_descs(struct mlx5e_txqsq *sq);

static inline bool
mlx5e_skb_fifo_has_room(struct mlx5e_skb_fifo *fifo)
{
	return (u16)(*fifo->pc - *fifo->cc) <= fifo->mask;
}

static inline bool
mlx5e_wqc_has_room_for(struct mlx5_wq_cyc *wq, u16 cc, u16 pc, u16 n)
{
	return (mlx5_wq_cyc_ctr2ix(wq, cc - pc) >= n) || (cc == pc);
}

static inline void *mlx5e_fetch_wqe(struct mlx5_wq_cyc *wq, u16 pi, size_t wqe_size)
{
	void *wqe;

	wqe = mlx5_wq_cyc_get_wqe(wq, pi);
	memset(wqe, 0, wqe_size);

	return wqe;
}

#define MLX5E_TX_FETCH_WQE(sq, pi) \
	((struct mlx5e_tx_wqe *)mlx5e_fetch_wqe(&(sq)->wq, pi, sizeof(struct mlx5e_tx_wqe)))

static inline struct mlx5e_tx_wqe *
mlx5e_post_nop(struct mlx5_wq_cyc *wq, u32 sqn, u16 *pc)
{
	u16                         pi   = mlx5_wq_cyc_ctr2ix(wq, *pc);
	struct mlx5e_tx_wqe        *wqe  = mlx5_wq_cyc_get_wqe(wq, pi);
	struct mlx5_wqe_ctrl_seg   *cseg = &wqe->ctrl;

	memset(cseg, 0, sizeof(*cseg));

	cseg->opmod_idx_opcode = cpu_to_be32((*pc << 8) | MLX5_OPCODE_NOP);
	cseg->qpn_ds           = cpu_to_be32((sqn << 8) | 0x01);

	(*pc)++;

	return wqe;
}

static inline struct mlx5e_tx_wqe *
mlx5e_post_nop_fence(struct mlx5_wq_cyc *wq, u32 sqn, u16 *pc)
{
	u16                         pi   = mlx5_wq_cyc_ctr2ix(wq, *pc);
	struct mlx5e_tx_wqe        *wqe  = mlx5_wq_cyc_get_wqe(wq, pi);
	struct mlx5_wqe_ctrl_seg   *cseg = &wqe->ctrl;

	memset(cseg, 0, sizeof(*cseg));

	cseg->opmod_idx_opcode = cpu_to_be32((*pc << 8) | MLX5_OPCODE_NOP);
	cseg->qpn_ds           = cpu_to_be32((sqn << 8) | 0x01);
	cseg->fm_ce_se         = MLX5_FENCE_MODE_INITIATOR_SMALL;

	(*pc)++;

	return wqe;
}

struct mlx5e_tx_wqe_info {
	struct sk_buff *skb;
	u32 num_bytes;
	u8 num_wqebbs;
	u8 num_dma;
	u8 num_fifo_pkts;
#ifdef CONFIG_MLX5_EN_TLS
	struct page *resync_dump_frag_page;
#endif
};

static inline u16 mlx5e_txqsq_get_next_pi(struct mlx5e_txqsq *sq, u16 size)
{

Annotation

Implementation Notes