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samples/bpf: Fix tracex2 error: No such file or directory

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since commit c504e5c2f964("net: skb: introduce kfree_skb_reason()")
kfree_skb() is replaced by kfree_skb_reason() and kfree_skb() is set to
the inline function. So, we replace kprobe/kfree_skb with
kprobe/kfree_skb_reason to solve the tracex2 error.

 $ cd samples/bpf
 $ sudo ./tracex2
 libbpf: prog 'bpf_prog2': failed to create kprobe 'kfree_skb+0x0' perf event: No such file or directory
 ERROR: bpf_program__attach failed

Signed-off-by: Rong Tao <rongtao@cestc.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/tencent_0F0DAE84C0B3C42E0B550E5E9F47A9114D09@qq.com
This commit is contained in:
Rong Tao 2022-10-29 17:11:13 +08:00 committed by Andrii Nakryiko
parent 2e20f50ff8
commit 1baa7e3800
2 changed files with 4 additions and 3 deletions
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4
samples/bpf/tracex2_kern.c
View File

@ -22,14 +22,14 @@ struct {
/* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
* example will no longer be meaningful
*/
SEC("kprobe/kfree_skb")
SEC("kprobe/kfree_skb_reason")
int bpf_prog2(struct pt_regs *ctx)
{
long loc = 0;
long init_val = 1;
long *value;
/* read ip of kfree_skb caller.
/* read ip of kfree_skb_reason caller.
* non-portable version of __builtin_return_address(0)
*/
BPF_KPROBE_READ_RET_IP(loc, ctx);

3
samples/bpf/tracex2_user.c
View File

@ -146,7 +146,8 @@ int main(int ac, char **argv)
signal(SIGINT, int_exit);
signal(SIGTERM, int_exit);
/* start 'ping' in the background to have some kfree_skb events */
/* start 'ping' in the background to have some kfree_skb_reason
* events */
f = popen("ping -4 -c5 localhost", "r");
(void) f;