2 * Copyright (c) 2016 Oracle. All rights reserved.
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:
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11 * without modification, are permitted provided that the following
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15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
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21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 #include <linux/kernel.h>
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))
50 enum rds_ib_fr_state {
51 FRMR_IS_FREE, /* mr invalidated & ready for use */
52 FRMR_IS_INUSE, /* mr is in use or used & can be invalidated */
53 FRMR_IS_STALE, /* Stale MR and needs to be dropped */
58 enum rds_ib_fr_state fr_state;
60 struct ib_send_wr fr_wr;
61 unsigned int dma_npages;
62 unsigned int sg_byte_len;
65 /* This is stored as mr->r_trans_private. */
67 struct rds_ib_device *device;
68 struct rds_ib_mr_pool *pool;
69 struct rds_ib_connection *ic;
71 struct llist_node llnode;
73 /* unmap_list is for freeing */
74 struct list_head unmap_list;
75 unsigned int remap_count;
77 struct scatterlist *sg;
82 struct rds_ib_fmr fmr;
83 struct rds_ib_frmr frmr;
87 /* Our own little MR pool */
88 struct rds_ib_mr_pool {
89 unsigned int pool_type;
90 struct mutex flush_lock; /* serialize fmr invalidate */
91 struct delayed_work flush_worker; /* flush worker */
93 atomic_t item_count; /* total # of MRs */
94 atomic_t dirty_count; /* # dirty of MRs */
96 struct llist_head drop_list; /* MRs not reached max_maps */
97 struct llist_head free_list; /* unused MRs */
98 struct llist_head clean_list; /* unused & unmapped MRs */
99 wait_queue_head_t flush_wait;
101 atomic_t free_pinned; /* memory pinned by free MRs */
102 unsigned long max_items;
103 unsigned long max_items_soft;
104 unsigned long max_free_pinned;
105 struct ib_fmr_attr fmr_attr;
109 extern struct workqueue_struct *rds_ib_mr_wq;
110 extern bool prefer_frmr;
112 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
114 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
115 struct rds_info_rdma_connection *iinfo);
116 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
117 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
118 struct rds_sock *rs, u32 *key_ret);
119 void rds_ib_sync_mr(void *trans_private, int dir);
120 void rds_ib_free_mr(void *trans_private, int invalidate);
121 void rds_ib_flush_mrs(void);
122 int rds_ib_mr_init(void);
123 void rds_ib_mr_exit(void);
125 void __rds_ib_teardown_mr(struct rds_ib_mr *);
126 void rds_ib_teardown_mr(struct rds_ib_mr *);
127 struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *, int);
128 struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
129 int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
130 struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *, struct scatterlist *,
131 unsigned long, u32 *);
132 struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
133 void rds_ib_unreg_fmr(struct list_head *, unsigned int *,
134 unsigned long *, unsigned int);
135 void rds_ib_free_fmr_list(struct rds_ib_mr *);
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 *);