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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
46enum 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
52struct 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. */
65struct 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 */
89struct 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
110extern struct workqueue_struct *rds_ib_mr_wq;
111
112struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
113 int npages);
114void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
115 struct rds_info_rdma_connection *iinfo);
116void rds6_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
117 struct rds6_info_rdma_connection *iinfo6);
118void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
119void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
120 struct rds_sock *rs, u32 *key_ret,
121 struct rds_connection *conn, u64 start, u64 length,
122 int need_odp);
123void rds_ib_sync_mr(void *trans_private, int dir);
124void rds_ib_free_mr(void *trans_private, int invalidate);
125void rds_ib_flush_mrs(void);
126int rds_ib_mr_init(void);
127void rds_ib_mr_exit(void);
128u32 rds_ib_get_lkey(void *trans_private);
129
130void __rds_ib_teardown_mr(struct rds_ib_mr *);
131void rds_ib_teardown_mr(struct rds_ib_mr *);
132struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
133int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
134struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
135struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev,
136 struct rds_ib_connection *ic,
137 struct scatterlist *sg,
138 unsigned long nents, u32 *key);
139void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed,
140 unsigned long *unpinned, unsigned int goal);
141void rds_ib_free_frmr_list(struct rds_ib_mr *);
142#endif