include/rdma/rdmavt_mr.h

Source file repositories/reference/linux-study-clean/include/rdma/rdmavt_mr.h

File Facts

System
Linux kernel
Corpus path
include/rdma/rdmavt_mr.h
Extension
.h
Size
4038 bytes
Lines
156
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rvt_seg {
	void *vaddr;
	size_t length;
};

/* The number of rvt_segs that fit in a page. */
#define RVT_SEGSZ     (PAGE_SIZE / sizeof(struct rvt_seg))

struct rvt_segarray {
	struct rvt_seg segs[RVT_SEGSZ];
};

struct rvt_mregion {
	struct ib_pd *pd;       /* shares refcnt of ibmr.pd */
	u64 user_base;          /* User's address for this region */
	u64 iova;               /* IB start address of this region */
	size_t length;
	u32 lkey;
	u32 offset;             /* offset (bytes) to start of region */
	int access_flags;
	u32 max_segs;           /* number of rvt_segs in all the arrays */
	u32 mapsz;              /* size of the map array */
	atomic_t lkey_invalid;	/* true if current lkey is invalid */
	u8  page_shift;         /* 0 - non unform/non powerof2 sizes */
	u8  lkey_published;     /* in global table */
	struct percpu_ref refcount;
	struct completion comp; /* complete when refcount goes to zero */
	struct rvt_segarray *map[];    /* the segments */
};

#define RVT_MAX_LKEY_TABLE_BITS 23

struct rvt_lkey_table {
	/* read mostly fields */
	u32 max;                /* size of the table */
	u32 shift;              /* lkey/rkey shift */
	struct rvt_mregion __rcu **table;
	/* writeable fields */
	/* protect changes in this struct */
	spinlock_t lock ____cacheline_aligned_in_smp;
	u32 next;               /* next unused index (speeds search) */
	u32 gen;                /* generation count */
};

/*
 * These keep track of the copy progress within a memory region.
 * Used by the verbs layer.
 */
struct rvt_sge {
	struct rvt_mregion *mr;
	void *vaddr;            /* kernel virtual address of segment */
	u32 sge_length;         /* length of the SGE */
	u32 length;             /* remaining length of the segment */
	u16 m;                  /* current index: mr->map[m] */
	u16 n;                  /* current index: mr->map[m]->segs[n] */
};

struct rvt_sge_state {
	struct rvt_sge *sg_list;      /* next SGE to be used if any */
	struct rvt_sge sge;   /* progress state for the current SGE */
	u32 total_len;
	u8 num_sge;
};

static inline void rvt_put_mr(struct rvt_mregion *mr)
{
	percpu_ref_put(&mr->refcount);
}

static inline void rvt_get_mr(struct rvt_mregion *mr)
{
	percpu_ref_get(&mr->refcount);
}

static inline void rvt_put_ss(struct rvt_sge_state *ss)
{
	while (ss->num_sge) {
		rvt_put_mr(ss->sge.mr);
		if (--ss->num_sge)
			ss->sge = *ss->sg_list++;
	}
}

static inline u32 rvt_get_sge_length(struct rvt_sge *sge, u32 length)
{
	u32 len = sge->length;

	if (len > length)
		len = length;
	if (len > sge->sge_length)

Annotation

Implementation Notes