linux-stable/kernel/bpf/bpf_lru_list.h
Thomas Gleixner 25763b3c86 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of version 2 of the gnu general public license as
  published by the free software foundation

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 107 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528171438.615055994@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:29:53 -07:00

82 lines
2.1 KiB
C

/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2016 Facebook
*/
#ifndef __BPF_LRU_LIST_H_
#define __BPF_LRU_LIST_H_
#include <linux/list.h>
#include <linux/spinlock_types.h>
#define NR_BPF_LRU_LIST_T (3)
#define NR_BPF_LRU_LIST_COUNT (2)
#define NR_BPF_LRU_LOCAL_LIST_T (2)
#define BPF_LOCAL_LIST_T_OFFSET NR_BPF_LRU_LIST_T
enum bpf_lru_list_type {
BPF_LRU_LIST_T_ACTIVE,
BPF_LRU_LIST_T_INACTIVE,
BPF_LRU_LIST_T_FREE,
BPF_LRU_LOCAL_LIST_T_FREE,
BPF_LRU_LOCAL_LIST_T_PENDING,
};
struct bpf_lru_node {
struct list_head list;
u16 cpu;
u8 type;
u8 ref;
};
struct bpf_lru_list {
struct list_head lists[NR_BPF_LRU_LIST_T];
unsigned int counts[NR_BPF_LRU_LIST_COUNT];
/* The next inacitve list rotation starts from here */
struct list_head *next_inactive_rotation;
raw_spinlock_t lock ____cacheline_aligned_in_smp;
};
struct bpf_lru_locallist {
struct list_head lists[NR_BPF_LRU_LOCAL_LIST_T];
u16 next_steal;
raw_spinlock_t lock;
};
struct bpf_common_lru {
struct bpf_lru_list lru_list;
struct bpf_lru_locallist __percpu *local_list;
};
typedef bool (*del_from_htab_func)(void *arg, struct bpf_lru_node *node);
struct bpf_lru {
union {
struct bpf_common_lru common_lru;
struct bpf_lru_list __percpu *percpu_lru;
};
del_from_htab_func del_from_htab;
void *del_arg;
unsigned int hash_offset;
unsigned int nr_scans;
bool percpu;
};
static inline void bpf_lru_node_set_ref(struct bpf_lru_node *node)
{
/* ref is an approximation on access frequency. It does not
* have to be very accurate. Hence, no protection is used.
*/
if (!node->ref)
node->ref = 1;
}
int bpf_lru_init(struct bpf_lru *lru, bool percpu, u32 hash_offset,
del_from_htab_func del_from_htab, void *delete_arg);
void bpf_lru_populate(struct bpf_lru *lru, void *buf, u32 node_offset,
u32 elem_size, u32 nr_elems);
void bpf_lru_destroy(struct bpf_lru *lru);
struct bpf_lru_node *bpf_lru_pop_free(struct bpf_lru *lru, u32 hash);
void bpf_lru_push_free(struct bpf_lru *lru, struct bpf_lru_node *node);
void bpf_lru_promote(struct bpf_lru *lru, struct bpf_lru_node *node);
#endif