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
 46struct rds_ib_fmr {
 47	struct ib_fmr		*fmr;
 48};
 49
 50enum 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
 56struct 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. */
 66struct 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 */
 88struct 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
109extern struct workqueue_struct *rds_ib_mr_wq;
110extern bool prefer_frmr;
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 rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
117void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
118		    struct rds_sock *rs, u32 *key_ret);
119void rds_ib_sync_mr(void *trans_private, int dir);
120void rds_ib_free_mr(void *trans_private, int invalidate);
121void rds_ib_flush_mrs(void);
122int rds_ib_mr_init(void);
123void rds_ib_mr_exit(void);
124
125void __rds_ib_teardown_mr(struct rds_ib_mr *);
126void rds_ib_teardown_mr(struct rds_ib_mr *);
127struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *, int);
128struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
129int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
130struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *, struct scatterlist *,
131				 unsigned long, u32 *);
132struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
133void rds_ib_unreg_fmr(struct list_head *, unsigned int *,
134		      unsigned long *, unsigned int);
135void rds_ib_free_fmr_list(struct rds_ib_mr *);
136struct 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);
140void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed,
141		       unsigned long *unpinned, unsigned int goal);
142void rds_ib_free_frmr_list(struct rds_ib_mr *);
143#endif