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5f33141d2f
In order to:
1) avoid a silly bouncing between "clean_list" and "drop_list"
triggered by function "rds_ib_reg_frmr" as it is releases frmr
regions whose state is not "FRMR_IS_FREE" right away.
2) prevent an invalid access error in a race from a pending
"IB_WR_LOCAL_INV" operation with a teardown ("dma_unmap_sg", "put_page")
and de-registration ("ib_dereg_mr") of the corresponding
memory region.
Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
151 lines
5.0 KiB
C
151 lines
5.0 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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};
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enum rds_ib_fr_state {
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FRMR_IS_FREE, /* mr invalidated & ready for use */
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FRMR_IS_INUSE, /* mr is in use or used & can be invalidated */
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FRMR_IS_STALE, /* Stale MR and needs to be dropped */
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};
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struct rds_ib_frmr {
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struct ib_mr *mr;
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enum rds_ib_fr_state fr_state;
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bool fr_inv;
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wait_queue_head_t fr_inv_done;
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bool fr_reg;
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wait_queue_head_t fr_reg_done;
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struct ib_send_wr fr_wr;
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unsigned int dma_npages;
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unsigned int sg_byte_len;
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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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struct rds_ib_frmr frmr;
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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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spinlock_t clean_lock; /* "clean_list" concurrency */
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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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bool use_fastreg;
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};
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extern struct workqueue_struct *rds_ib_mr_wq;
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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 rds6_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
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struct rds6_info_rdma_connection *iinfo6);
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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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struct rds_connection *conn);
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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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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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struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev,
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struct rds_ib_connection *ic,
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struct scatterlist *sg,
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unsigned long nents, u32 *key);
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void rds_ib_unreg_frmr(struct list_head *list, unsigned int *nfreed,
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unsigned long *unpinned, unsigned int goal);
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void rds_ib_free_frmr_list(struct rds_ib_mr *);
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#endif
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