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
  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;
 111extern bool prefer_frmr;
 112
 113struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
 114                                             int npages);
 115void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
 116                        struct rds_info_rdma_connection *iinfo);
 117void rds6_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
 118                         struct rds6_info_rdma_connection *iinfo6);
 119void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
 120void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 121                    struct rds_sock *rs, u32 *key_ret,
 122                    struct rds_connection *conn, u64 start, u64 length,
 123                    int need_odp);
 124void rds_ib_sync_mr(void *trans_private, int dir);
 125void rds_ib_free_mr(void *trans_private, int invalidate);
 126void rds_ib_flush_mrs(void);
 127int rds_ib_mr_init(void);
 128void rds_ib_mr_exit(void);
 129u32 rds_ib_get_lkey(void *trans_private);
 130
 131void __rds_ib_teardown_mr(struct rds_ib_mr *);
 132void rds_ib_teardown_mr(struct rds_ib_mr *);
 133struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
 134int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
 135struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
 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