summaryrefslogtreecommitdiffstats
path: root/net/rds/ib_mr.h
blob: f440ace584c8f363639171bab2d986d1dc24043b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*
 * 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;
};

enum rds_ib_fr_state {
	FRMR_IS_FREE,	/* mr invalidated & ready for use */
	FRMR_IS_INUSE,	/* mr is in use or used & can be invalidated */
	FRMR_IS_STALE,	/* Stale MR and needs to be dropped  */
};

struct rds_ib_frmr {
	struct ib_mr		*mr;
	enum rds_ib_fr_state	fr_state;
	bool			fr_inv;
	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 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;

	union {
		struct rds_ib_fmr	fmr;
		struct rds_ib_frmr	frmr;
	} 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;
	bool			use_fastreg;
};

extern struct workqueue_struct *rds_ib_mr_wq;
extern bool prefer_frmr;

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);
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);
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_reg_fmr(struct rds_ib_device *, struct scatterlist *,
				 unsigned long, u32 *);
struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
void rds_ib_unreg_fmr(struct list_head *, unsigned int *,
		      unsigned long *, unsigned int);
void rds_ib_free_fmr_list(struct rds_ib_mr *);
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 *);
#endif