diff mbox series

[bpf-next,2/2] bpf: allow kfuncs within normal tracepoint programs

Message ID 20240814235800.15253-3-inwardvessel@gmail.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series allow calling kfuncs in normal tracepoint programs | expand

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bpf/vmtest-bpf-next-PR success PR summary
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Commit Message

JP Kobryn Aug. 14, 2024, 11:58 p.m. UTC 
Account for normal tracepoint programs by associating them with the kfunc
tracing hook. This allows kfuncs to be called within tracepoint programs.

Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
---
 kernel/bpf/btf.c | 1 +
 1 file changed, 1 insertion(+)

Comments

Andrii Nakryiko Aug. 15, 2024, 10:51 p.m. UTC | #1 
On Wed, Aug 14, 2024 at 4:58 PM JP Kobryn <inwardvessel@gmail.com> wrote:
>
> Account for normal tracepoint programs by associating them with the kfunc
> tracing hook. This allows kfuncs to be called within tracepoint programs.
>
> Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
> ---
>  kernel/bpf/btf.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
> index 520f49f422fe..8b844d6fd041 100644
> --- a/kernel/bpf/btf.c
> +++ b/kernel/bpf/btf.c
> @@ -8303,6 +8303,7 @@ static int bpf_prog_type_to_kfunc_hook(enum bpf_prog_type prog_type)
>                 return BTF_KFUNC_HOOK_TC;
>         case BPF_PROG_TYPE_STRUCT_OPS:
>                 return BTF_KFUNC_HOOK_STRUCT_OPS;
> +       case BPF_PROG_TYPE_TRACEPOINT:
>         case BPF_PROG_TYPE_TRACING:
>         case BPF_PROG_TYPE_LSM:
>                 return BTF_KFUNC_HOOK_TRACING;
> --
> 2.46.0
>

I'm not 100% sure it's ok to map TRACEPOINT prog type to HOOK_TRACING.
But assuming it is, shouldn't we then also do the same for KPROBE and
PERF_EVENT programs?

Either way, please consider Eduard's suggestion about changing patch
order and switching to TEST_LOADER approach.

pw-bot: cr
diff mbox series

Patch

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 520f49f422fe..8b844d6fd041 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -8303,6 +8303,7 @@  static int bpf_prog_type_to_kfunc_hook(enum bpf_prog_type prog_type)
 		return BTF_KFUNC_HOOK_TC;
 	case BPF_PROG_TYPE_STRUCT_OPS:
 		return BTF_KFUNC_HOOK_STRUCT_OPS;
+	case BPF_PROG_TYPE_TRACEPOINT:
 	case BPF_PROG_TYPE_TRACING:
 	case BPF_PROG_TYPE_LSM:
 		return BTF_KFUNC_HOOK_TRACING;