net/rds/ib_mr.h

Source file repositories/reference/linux-study-clean/net/rds/ib_mr.h

File Facts

System
Linux kernel
Corpus path
net/rds/ib_mr.h
Extension
.h
Size
4854 bytes
Lines
143
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rds_ib_frmr {
	struct ib_mr		*mr;
	enum rds_ib_fr_state	fr_state;
	bool			fr_inv;
	wait_queue_head_t	fr_inv_done;
	bool			fr_reg;
	wait_queue_head_t	fr_reg_done;
	struct ib_send_wr	fr_wr;
	unsigned int		dma_npages;
	unsigned int		sg_byte_len;
};

/* This is stored as mr->r_trans_private. */
struct rds_ib_mr {
	struct delayed_work		work;
	struct rds_ib_device		*device;
	struct rds_ib_mr_pool		*pool;
	struct rds_ib_connection	*ic;

	struct llist_node		llnode;

	/* unmap_list is for freeing */
	struct list_head		unmap_list;
	unsigned int			remap_count;

	struct scatterlist		*sg;
	unsigned int			sg_len;
	int				sg_dma_len;

	u8				odp:1;
	union {
		struct rds_ib_frmr	frmr;
		struct ib_mr		*mr;
	} u;
};

/* Our own little MR pool */
struct rds_ib_mr_pool {
	unsigned int            pool_type;
	struct mutex		flush_lock;	/* serialize fmr invalidate */
	struct delayed_work	flush_worker;	/* flush worker */

	atomic_t		item_count;	/* total # of MRs */
	atomic_t		dirty_count;	/* # dirty of MRs */

	struct llist_head	drop_list;	/* MRs not reached max_maps */
	struct llist_head	free_list;	/* unused MRs */
	struct llist_head	clean_list;	/* unused & unmapped MRs */
	wait_queue_head_t	flush_wait;
	spinlock_t		clean_lock;	/* "clean_list" concurrency */

	atomic_t		free_pinned;	/* memory pinned by free MRs */
	unsigned long		max_items;
	unsigned long		max_items_soft;
	unsigned long		max_free_pinned;
	unsigned int		max_pages;
};

extern struct workqueue_struct *rds_ib_mr_wq;

struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
					     int npages);
void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
			struct rds_info_rdma_connection *iinfo);
void rds6_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
			 struct rds6_info_rdma_connection *iinfo6);
void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
		    struct rds_sock *rs, u32 *key_ret,
		    struct rds_connection *conn, u64 start, u64 length,
		    int need_odp);
void rds_ib_sync_mr(void *trans_private, int dir);
void rds_ib_free_mr(void *trans_private, int invalidate);
void rds_ib_flush_mrs(void);
int rds_ib_mr_init(void);
void rds_ib_mr_exit(void);
u32 rds_ib_get_lkey(void *trans_private);

void __rds_ib_teardown_mr(struct rds_ib_mr *);
void rds_ib_teardown_mr(struct rds_ib_mr *);
struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev,
				  struct rds_ib_connection *ic,
				  struct scatterlist *sg,
				  unsigned long nents, u32 *key);
void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed,
		       unsigned long *unpinned, unsigned int goal);
void rds_ib_free_frmr_list(struct rds_ib_mr *);

Annotation

Implementation Notes