LXR linux/net/rds/ib

   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
 144