[deliverable/linux.git] / net / rds / ib_mr.h

/*
 * Copyright (c) 2016 Oracle.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#ifndef _RDS_IB_MR_H
#define _RDS_IB_MR_H

#include <linux/kernel.h>

#include "rds.h"
#include "ib.h"

#define RDS_MR_1M_POOL_SIZE		(8192 / 2)
#define RDS_MR_1M_MSG_SIZE		256
#define RDS_MR_8K_MSG_SIZE		2
#define RDS_MR_8K_SCALE			(256 / (RDS_MR_8K_MSG_SIZE + 1))
#define RDS_MR_8K_POOL_SIZE		(RDS_MR_8K_SCALE * (8192 / 2))

struct rds_ib_fmr {
	struct ib_fmr		*fmr;
	u64			*dma;
};

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

	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;

	union {
		struct rds_ib_fmr	fmr;
	} 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;

	atomic_t		free_pinned;	/* memory pinned by free MRs */
	unsigned long		max_items;
	unsigned long		max_items_soft;
	unsigned long		max_free_pinned;
	struct ib_fmr_attr	fmr_attr;
};

extern struct workqueue_struct *rds_ib_mr_wq;
extern unsigned int rds_ib_mr_1m_pool_size;
extern unsigned int rds_ib_mr_8k_pool_size;

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 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);
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);

void __rds_ib_teardown_mr(struct rds_ib_mr *);
void rds_ib_teardown_mr(struct rds_ib_mr *);
struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *, int);
int rds_ib_map_fmr(struct rds_ib_device *, struct rds_ib_mr *,
		   struct scatterlist *, unsigned int);
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 **);
#endif
Commit	Line	Data
f6df683f	1	/*
	2	* Copyright (c) 2016 Oracle. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*/
	32	#ifndef _RDS_IB_MR_H
	33	#define _RDS_IB_MR_H
	34
	35	#include <linux/kernel.h>
	36
	37	#include "rds.h"
	38	#include "ib.h"
	39
	40	#define RDS_MR_1M_POOL_SIZE (8192 / 2)
	41	#define RDS_MR_1M_MSG_SIZE 256
	42	#define RDS_MR_8K_MSG_SIZE 2
	43	#define RDS_MR_8K_SCALE (256 / (RDS_MR_8K_MSG_SIZE + 1))
	44	#define RDS_MR_8K_POOL_SIZE (RDS_MR_8K_SCALE * (8192 / 2))
	45
a69365a3	46	struct rds_ib_fmr {
	47	struct ib_fmr *fmr;
	48	u64 *dma;
	49	};
	50
f6df683f	51	/* This is stored as mr->r_trans_private. */
	52	struct rds_ib_mr {
	53	struct rds_ib_device *device;
	54	struct rds_ib_mr_pool *pool;
f6df683f	55
	56	struct llist_node llnode;
	57
	58	/* unmap_list is for freeing */
	59	struct list_head unmap_list;
	60	unsigned int remap_count;
	61
	62	struct scatterlist *sg;
	63	unsigned int sg_len;
f6df683f	64	int sg_dma_len;
a69365a3	65
	66	union {
	67	struct rds_ib_fmr fmr;
	68	} u;
f6df683f	69	};
	70
	71	/* Our own little MR pool */
	72	struct rds_ib_mr_pool {
	73	unsigned int pool_type;
	74	struct mutex flush_lock; /* serialize fmr invalidate */
	75	struct delayed_work flush_worker; /* flush worker */
	76
	77	atomic_t item_count; /* total # of MRs */
	78	atomic_t dirty_count; /* # dirty of MRs */
	79
	80	struct llist_head drop_list; /* MRs not reached max_maps */
	81	struct llist_head free_list; /* unused MRs */
	82	struct llist_head clean_list; /* unused & unmapped MRs */
	83	wait_queue_head_t flush_wait;
	84
	85	atomic_t free_pinned; /* memory pinned by free MRs */
	86	unsigned long max_items;
	87	unsigned long max_items_soft;
	88	unsigned long max_free_pinned;
	89	struct ib_fmr_attr fmr_attr;
	90	};
	91
	92	extern struct workqueue_struct *rds_ib_mr_wq;
	93	extern unsigned int rds_ib_mr_1m_pool_size;
	94	extern unsigned int rds_ib_mr_8k_pool_size;
	95
	96	struct rds_ib_mr_pool rds_ib_create_mr_pool(struct rds_ib_device rds_dev,
	97	int npages);
	98	void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
	99	struct rds_info_rdma_connection *iinfo);
	100	void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
	101	void rds_ib_get_mr(struct scatterlist sg, unsigned long nents,
	102	struct rds_sock rs, u32 key_ret);
	103	void rds_ib_sync_mr(void *trans_private, int dir);
	104	void rds_ib_free_mr(void *trans_private, int invalidate);
	105	void rds_ib_flush_mrs(void);
	106	int rds_ib_mr_init(void);
	107	void rds_ib_mr_exit(void);
	108
	109	void __rds_ib_teardown_mr(struct rds_ib_mr *);
	110	void rds_ib_teardown_mr(struct rds_ib_mr *);
	111	struct rds_ib_mr rds_ib_alloc_fmr(struct rds_ib_device , int);
	112	int rds_ib_map_fmr(struct rds_ib_device , struct rds_ib_mr ,
	113	struct scatterlist *, unsigned int);
	114	struct rds_ib_mr rds_ib_reuse_mr(struct rds_ib_mr_pool );
	115	int rds_ib_flush_mr_pool(struct rds_ib_mr_pool , int, struct rds_ib_mr *);
	116	#endif