forked from Minki/linux
25763b3c86
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>
83 lines
2.1 KiB
C
83 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
|