3f2189e4f7
For bpf_global_percpu_ma, the pointer passed to bpf_mem_free_rcu() is allocated by kmalloc() and its size is fixed (16-bytes on x86-64). So no matter which cache allocates the dynamic per-cpu area, on x86-64 cache[2] will always be used to free the per-cpu area. Fix the unbalance by checking whether the bpf memory allocator is per-cpu or not and use pcpu_alloc_size() instead of ksize() to find the correct cache for per-cpu free. Signed-off-by: Hou Tao <houtao1@huawei.com> Link: https://lore.kernel.org/r/20231020133202.4043247-5-houtao@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
|
|
#ifndef _BPF_MEM_ALLOC_H
|
|
#define _BPF_MEM_ALLOC_H
|
|
#include <linux/compiler_types.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
struct bpf_mem_cache;
|
|
struct bpf_mem_caches;
|
|
|
|
struct bpf_mem_alloc {
|
|
struct bpf_mem_caches __percpu *caches;
|
|
struct bpf_mem_cache __percpu *cache;
|
|
bool percpu;
|
|
struct work_struct work;
|
|
};
|
|
|
|
/* 'size != 0' is for bpf_mem_alloc which manages fixed-size objects.
|
|
* Alloc and free are done with bpf_mem_cache_{alloc,free}().
|
|
*
|
|
* 'size = 0' is for bpf_mem_alloc which manages many fixed-size objects.
|
|
* Alloc and free are done with bpf_mem_{alloc,free}() and the size of
|
|
* the returned object is given by the size argument of bpf_mem_alloc().
|
|
*/
|
|
int bpf_mem_alloc_init(struct bpf_mem_alloc *ma, int size, bool percpu);
|
|
void bpf_mem_alloc_destroy(struct bpf_mem_alloc *ma);
|
|
|
|
/* kmalloc/kfree equivalent: */
|
|
void *bpf_mem_alloc(struct bpf_mem_alloc *ma, size_t size);
|
|
void bpf_mem_free(struct bpf_mem_alloc *ma, void *ptr);
|
|
void bpf_mem_free_rcu(struct bpf_mem_alloc *ma, void *ptr);
|
|
|
|
/* kmem_cache_alloc/free equivalent: */
|
|
void *bpf_mem_cache_alloc(struct bpf_mem_alloc *ma);
|
|
void bpf_mem_cache_free(struct bpf_mem_alloc *ma, void *ptr);
|
|
void bpf_mem_cache_free_rcu(struct bpf_mem_alloc *ma, void *ptr);
|
|
void bpf_mem_cache_raw_free(void *ptr);
|
|
void *bpf_mem_cache_alloc_flags(struct bpf_mem_alloc *ma, gfp_t flags);
|
|
|
|
#endif /* _BPF_MEM_ALLOC_H */
|