mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-19 10:44:14 +08:00
59929cd1fe
Because the previous two commit replaced the bpf_load implementation of the user program with libbpf, the corresponding kernel program's MAP definition can be replaced with new BTF-defined map syntax. This commit only updates the samples which uses libbpf API for loading bpf program not with bpf_load. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20200516040608.1377876-6-danieltimlee@gmail.com
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
|
|
*
|
|
* 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.
|
|
*/
|
|
#include <linux/ptrace.h>
|
|
#include <linux/version.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
|
|
struct pair {
|
|
u64 val;
|
|
u64 ip;
|
|
};
|
|
|
|
struct {
|
|
__uint(type, BPF_MAP_TYPE_HASH);
|
|
__type(key, long);
|
|
__type(value, struct pair);
|
|
__uint(max_entries, 1000000);
|
|
} my_map SEC(".maps");
|
|
|
|
/* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
|
|
* example will no longer be meaningful
|
|
*/
|
|
SEC("kprobe/kmem_cache_free")
|
|
int bpf_prog1(struct pt_regs *ctx)
|
|
{
|
|
long ptr = PT_REGS_PARM2(ctx);
|
|
|
|
bpf_map_delete_elem(&my_map, &ptr);
|
|
return 0;
|
|
}
|
|
|
|
SEC("kretprobe/kmem_cache_alloc_node")
|
|
int bpf_prog2(struct pt_regs *ctx)
|
|
{
|
|
long ptr = PT_REGS_RC(ctx);
|
|
long ip = 0;
|
|
|
|
/* get ip address of kmem_cache_alloc_node() caller */
|
|
BPF_KRETPROBE_READ_RET_IP(ip, ctx);
|
|
|
|
struct pair v = {
|
|
.val = bpf_ktime_get_ns(),
|
|
.ip = ip,
|
|
};
|
|
|
|
bpf_map_update_elem(&my_map, &ptr, &v, BPF_ANY);
|
|
return 0;
|
|
}
|
|
char _license[] SEC("license") = "GPL";
|
|
u32 _version SEC("version") = LINUX_VERSION_CODE;
|