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2cb2912d65
Discovere Fast Memmory Registration support using IB device IB_DEVICE_MEM_MGT_EXTENSIONS. Certain HCA might support just FRMR or FMR or both FMR and FRWR. In case both mr type are supported, default FMR is used. Default MR is still kept as FMR against what everyone else is following. Default will be changed to FRMR once the RDS performance with FRMR is comparable with FMR. The work is in progress for the same. Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
125 lines
4.2 KiB
C
125 lines
4.2 KiB
C
/*
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* Copyright (c) 2016 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _RDS_IB_MR_H
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#define _RDS_IB_MR_H
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#include <linux/kernel.h>
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#include "rds.h"
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#include "ib.h"
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#define RDS_MR_1M_POOL_SIZE (8192 / 2)
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#define RDS_MR_1M_MSG_SIZE 256
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#define RDS_MR_8K_MSG_SIZE 2
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#define RDS_MR_8K_SCALE (256 / (RDS_MR_8K_MSG_SIZE + 1))
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#define RDS_MR_8K_POOL_SIZE (RDS_MR_8K_SCALE * (8192 / 2))
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struct rds_ib_fmr {
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struct ib_fmr *fmr;
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u64 *dma;
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};
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/* This is stored as mr->r_trans_private. */
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struct rds_ib_mr {
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struct rds_ib_device *device;
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struct rds_ib_mr_pool *pool;
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struct rds_ib_connection *ic;
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struct llist_node llnode;
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/* unmap_list is for freeing */
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struct list_head unmap_list;
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unsigned int remap_count;
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struct scatterlist *sg;
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unsigned int sg_len;
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int sg_dma_len;
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union {
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struct rds_ib_fmr fmr;
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} u;
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};
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/* Our own little MR pool */
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struct rds_ib_mr_pool {
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unsigned int pool_type;
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struct mutex flush_lock; /* serialize fmr invalidate */
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struct delayed_work flush_worker; /* flush worker */
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atomic_t item_count; /* total # of MRs */
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atomic_t dirty_count; /* # dirty of MRs */
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struct llist_head drop_list; /* MRs not reached max_maps */
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struct llist_head free_list; /* unused MRs */
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struct llist_head clean_list; /* unused & unmapped MRs */
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wait_queue_head_t flush_wait;
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atomic_t free_pinned; /* memory pinned by free MRs */
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unsigned long max_items;
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unsigned long max_items_soft;
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unsigned long max_free_pinned;
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struct ib_fmr_attr fmr_attr;
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};
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extern struct workqueue_struct *rds_ib_mr_wq;
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extern unsigned int rds_ib_mr_1m_pool_size;
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extern unsigned int rds_ib_mr_8k_pool_size;
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extern bool prefer_frmr;
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struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_dev,
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int npages);
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void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
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struct rds_info_rdma_connection *iinfo);
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void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
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void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
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struct rds_sock *rs, u32 *key_ret);
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void rds_ib_sync_mr(void *trans_private, int dir);
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void rds_ib_free_mr(void *trans_private, int invalidate);
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void rds_ib_flush_mrs(void);
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int rds_ib_mr_init(void);
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void rds_ib_mr_exit(void);
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void __rds_ib_teardown_mr(struct rds_ib_mr *);
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void rds_ib_teardown_mr(struct rds_ib_mr *);
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struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *, int);
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int rds_ib_map_fmr(struct rds_ib_device *, struct rds_ib_mr *,
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struct scatterlist *, unsigned int);
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struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
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int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
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struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *, struct scatterlist *,
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unsigned long, u32 *);
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struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
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void rds_ib_unreg_fmr(struct list_head *, unsigned int *,
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unsigned long *, unsigned int);
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void rds_ib_free_fmr_list(struct rds_ib_mr *);
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#endif
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