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Linux/net/rds/ib_mr.h

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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 
 46 struct rds_ib_fmr {
 47         struct ib_fmr           *fmr;
 48 };
 49 
 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  */
 54 };
 55 
 56 struct rds_ib_frmr {
 57         struct ib_mr            *mr;
 58         enum rds_ib_fr_state    fr_state;
 59         bool                    fr_inv;
 60         struct ib_send_wr       fr_wr;
 61         unsigned int            dma_npages;
 62         unsigned int            sg_byte_len;
 63 };
 64 
 65 /* This is stored as mr->r_trans_private. */
 66 struct rds_ib_mr {
 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         union {
 82                 struct rds_ib_fmr       fmr;
 83                 struct rds_ib_frmr      frmr;
 84         } u;
 85 };
 86 
 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 */
 92 
 93         atomic_t                item_count;     /* total # of MRs */
 94         atomic_t                dirty_count;    /* # dirty of MRs */
 95 
 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;
100 
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;
106         bool                    use_fastreg;
107 };
108 
109 extern struct workqueue_struct *rds_ib_mr_wq;
110 extern bool prefer_frmr;
111 
112 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
113                                              int npages);
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);
124 
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 int rds_ib_map_fmr(struct rds_ib_device *, struct rds_ib_mr *,
129                    struct scatterlist *, unsigned int);
130 struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
131 int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
132 struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *, struct scatterlist *,
133                                  unsigned long, u32 *);
134 struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
135 void rds_ib_unreg_fmr(struct list_head *, unsigned int *,
136                       unsigned long *, unsigned int);
137 void rds_ib_free_fmr_list(struct rds_ib_mr *);
138 struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev,
139                                   struct rds_ib_connection *ic,
140                                   struct scatterlist *sg,
141                                   unsigned long nents, u32 *key);
142 void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed,
143                        unsigned long *unpinned, unsigned int goal);
144 void rds_ib_free_frmr_list(struct rds_ib_mr *);
145 #endif
146 

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