drivers/infiniband/hw/hfi1/exp_rcv.h

Source file repositories/reference/linux-study-clean/drivers/infiniband/hw/hfi1/exp_rcv.h

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/hw/hfi1/exp_rcv.h
Extension
.h
Size
4795 bytes
Lines
172
Domain
Driver Families
Bucket
drivers/infiniband
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 tid_group {
	struct list_head list;
	u32 base;
	u8 size;
	u8 used;
	u8 map;
};

/*
 * Write an "empty" RcvArray entry.
 * This function exists so the TID registaration code can use it
 * to write to unused/unneeded entries and still take advantage
 * of the WC performance improvements. The HFI will ignore this
 * write to the RcvArray entry.
 */
static inline void rcv_array_wc_fill(struct hfi1_devdata *dd, u32 index)
{
	/*
	 * Doing the WC fill writes only makes sense if the device is
	 * present and the RcvArray has been mapped as WC memory.
	 */
	if ((dd->flags & HFI1_PRESENT) && dd->rcvarray_wc) {
		writeq(0, dd->rcvarray_wc + (index * 8));
		if ((index & 3) == 3)
			flush_wc();
	}
}

static inline void tid_group_add_tail(struct tid_group *grp,
				      struct exp_tid_set *set)
{
	list_add_tail(&grp->list, &set->list);
	set->count++;
}

static inline void tid_group_remove(struct tid_group *grp,
				    struct exp_tid_set *set)
{
	list_del_init(&grp->list);
	set->count--;
}

static inline void tid_group_move(struct tid_group *group,
				  struct exp_tid_set *s1,
				  struct exp_tid_set *s2)
{
	tid_group_remove(group, s1);
	tid_group_add_tail(group, s2);
}

static inline struct tid_group *tid_group_pop(struct exp_tid_set *set)
{
	struct tid_group *grp =
		list_first_entry(&set->list, struct tid_group, list);
	list_del_init(&grp->list);
	set->count--;
	return grp;
}

static inline u32 create_tid(u32 rcventry, u32 npages)
{
	u32 pair = rcventry & ~0x1;

	return EXP_TID_SET(IDX, pair >> 1) |
		EXP_TID_SET(CTRL, 1 << (rcventry - pair)) |
		EXP_TID_SET(LEN, npages);
}

/**
 * hfi1_tid_group_to_idx - convert an index to a group
 * @rcd - the receive context
 * @grp - the group pointer
 */
static inline u16
hfi1_tid_group_to_idx(struct hfi1_ctxtdata *rcd, struct tid_group *grp)
{
	return grp - &rcd->groups[0];
}

/**
 * hfi1_idx_to_tid_group - convert a group to an index
 * @rcd - the receive context
 * @idx - the index
 */
static inline struct tid_group *
hfi1_idx_to_tid_group(struct hfi1_ctxtdata *rcd, u16 idx)
{
	return &rcd->groups[idx];
}

Annotation

Implementation Notes