xref: /linux/net/rds/ib_mr.h (revision 4b4193256c8d3bc3a5397b5cd9494c2ad386317d)
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 
46 enum rds_ib_fr_state {
47 	FRMR_IS_FREE,	/* mr invalidated & ready for use */
48 	FRMR_IS_INUSE,	/* mr is in use or used & can be invalidated */
49 	FRMR_IS_STALE,	/* Stale MR and needs to be dropped  */
50 };
51 
52 struct rds_ib_frmr {
53 	struct ib_mr		*mr;
54 	enum rds_ib_fr_state	fr_state;
55 	bool			fr_inv;
56 	wait_queue_head_t	fr_inv_done;
57 	bool			fr_reg;
58 	wait_queue_head_t	fr_reg_done;
59 	struct ib_send_wr	fr_wr;
60 	unsigned int		dma_npages;
61 	unsigned int		sg_byte_len;
62 };
63 
64 /* This is stored as mr->r_trans_private. */
65 struct rds_ib_mr {
66 	struct delayed_work		work;
67 	struct rds_ib_device		*device;
68 	struct rds_ib_mr_pool		*pool;
69 	struct rds_ib_connection	*ic;
70 
71 	struct llist_node		llnode;
72 
73 	/* unmap_list is for freeing */
74 	struct list_head		unmap_list;
75 	unsigned int			remap_count;
76 
77 	struct scatterlist		*sg;
78 	unsigned int			sg_len;
79 	int				sg_dma_len;
80 
81 	u8				odp:1;
82 	union {
83 		struct rds_ib_frmr	frmr;
84 		struct ib_mr		*mr;
85 	} u;
86 };
87 
88 /* Our own little MR pool */
89 struct rds_ib_mr_pool {
90 	unsigned int            pool_type;
91 	struct mutex		flush_lock;	/* serialize fmr invalidate */
92 	struct delayed_work	flush_worker;	/* flush worker */
93 
94 	atomic_t		item_count;	/* total # of MRs */
95 	atomic_t		dirty_count;	/* # dirty of MRs */
96 
97 	struct llist_head	drop_list;	/* MRs not reached max_maps */
98 	struct llist_head	free_list;	/* unused MRs */
99 	struct llist_head	clean_list;	/* unused & unmapped MRs */
100 	wait_queue_head_t	flush_wait;
101 	spinlock_t		clean_lock;	/* "clean_list" concurrency */
102 
103 	atomic_t		free_pinned;	/* memory pinned by free MRs */
104 	unsigned long		max_items;
105 	unsigned long		max_items_soft;
106 	unsigned long		max_free_pinned;
107 	unsigned int		max_pages;
108 };
109 
110 extern struct workqueue_struct *rds_ib_mr_wq;
111 extern bool prefer_frmr;
112 
113 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
114 					     int npages);
115 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
116 			struct rds_info_rdma_connection *iinfo);
117 void rds6_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
118 			 struct rds6_info_rdma_connection *iinfo6);
119 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
120 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
121 		    struct rds_sock *rs, u32 *key_ret,
122 		    struct rds_connection *conn, u64 start, u64 length,
123 		    int need_odp);
124 void rds_ib_sync_mr(void *trans_private, int dir);
125 void rds_ib_free_mr(void *trans_private, int invalidate);
126 void rds_ib_flush_mrs(void);
127 int rds_ib_mr_init(void);
128 void rds_ib_mr_exit(void);
129 u32 rds_ib_get_lkey(void *trans_private);
130 
131 void __rds_ib_teardown_mr(struct rds_ib_mr *);
132 void rds_ib_teardown_mr(struct rds_ib_mr *);
133 struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
134 int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
135 struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
136 struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev,
137 				  struct rds_ib_connection *ic,
138 				  struct scatterlist *sg,
139 				  unsigned long nents, u32 *key);
140 void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed,
141 		       unsigned long *unpinned, unsigned int goal);
142 void rds_ib_free_frmr_list(struct rds_ib_mr *);
143 #endif
144