On Fri, Nov 19, 2021 at 7:33 PM Alexei Starovoitov
<alexei.starovoitov@xxxxxxxxx> wrote:
>
> From: Alexei Starovoitov <ast@xxxxxxxxxx>
>
> Make relo_core.c to be compiled for the kernel and for user space libbpf.
>
> Note the patch is reducing BPF_CORE_SPEC_MAX_LEN from 64 to 32.
> This is the maximum number of nested structs and arrays.
> For example:
> struct sample {
> int a;
> struct {
> int b[10];
> };
> };
>
> struct sample *s = ...;
> int y = &s->b[5];
> This field access is encoded as "0:1:0:5" and spec len is 4.
>
> The follow up patch might bump it back to 64.
>
> Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
> ---
Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>
> include/linux/btf.h | 81 +++++++++++++++++++++++++++++++++++++++
> kernel/bpf/Makefile | 4 ++
> kernel/bpf/btf.c | 26 +++++++++++++
> tools/lib/bpf/relo_core.c | 76 ++++++++++++++++++++++++++++++------
> 4 files changed, 176 insertions(+), 11 deletions(-)
>
[...]
