drivers/net/ethernet/cisco/enic/vnic_wq.h

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/cisco/enic/vnic_wq.h

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/cisco/enic/vnic_wq.h
Extension
.h
Size
5109 bytes
Lines
187
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 vnic_wq_ctrl {
	u64 ring_base;			/* 0x00 */
	u32 ring_size;			/* 0x08 */
	u32 pad0;
	u32 posted_index;		/* 0x10 */
	u32 pad1;
	u32 cq_index;			/* 0x18 */
	u32 pad2;
	u32 enable;			/* 0x20 */
	u32 pad3;
	u32 running;			/* 0x28 */
	u32 pad4;
	u32 fetch_index;		/* 0x30 */
	u32 pad5;
	u32 dca_value;			/* 0x38 */
	u32 pad6;
	u32 error_interrupt_enable;	/* 0x40 */
	u32 pad7;
	u32 error_interrupt_offset;	/* 0x48 */
	u32 pad8;
	u32 error_status;		/* 0x50 */
	u32 pad9;
};

struct vnic_wq_buf {
	struct vnic_wq_buf *next;
	dma_addr_t dma_addr;
	void *os_buf;
	unsigned int len;
	unsigned int index;
	int sop;
	void *desc;
	uint64_t wr_id; /* Cookie */
	uint8_t cq_entry; /* Gets completion event from hw */
	uint8_t desc_skip_cnt; /* Num descs to occupy */
	uint8_t compressed_send; /* Both hdr and payload in one desc */
	struct vnic_wq_buf *prev;
};

/* Break the vnic_wq_buf allocations into blocks of 32/64 entries */
#define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32
#define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64
#define VNIC_WQ_BUF_BLK_ENTRIES(entries) \
	((unsigned int)((entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \
	VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES))
#define VNIC_WQ_BUF_BLK_SZ(entries) \
	(VNIC_WQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_wq_buf))
#define VNIC_WQ_BUF_BLKS_NEEDED(entries) \
	DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES(entries))
#define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(16384)

struct vnic_wq {
	unsigned int index;
	struct vnic_dev *vdev;
	struct vnic_wq_ctrl __iomem *ctrl;              /* memory-mapped */
	struct vnic_dev_ring ring;
	struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX];
	struct vnic_wq_buf *to_use;
	struct vnic_wq_buf *to_clean;
	unsigned int pkts_outstanding;
};

struct devcmd2_controller {
	struct vnic_wq_ctrl __iomem *wq_ctrl;
	struct vnic_devcmd2 *cmd_ring;
	struct devcmd2_result *result;
	u16 next_result;
	u16 result_size;
	int color;
	struct vnic_dev_ring results_ring;
	struct vnic_wq wq;
	u32 posted;
};

static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq)
{
	/* how many does SW own? */
	return wq->ring.desc_avail;
}

static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq)
{
	/* how many does HW own? */
	return wq->ring.desc_count - wq->ring.desc_avail - 1;
}

static inline void *vnic_wq_next_desc(struct vnic_wq *wq)
{
	return wq->to_use->desc;
}

Annotation

Implementation Notes