diff options
| author | Alexei Starovoitov <ast@kernel.org> | 2021-05-13 17:36:10 -0700 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2021-05-19 00:33:40 +0200 |
| commit | 387544bfa291a22383d60b40f887360e2b931ec6 (patch) | |
| tree | 2220ac18903453f6499b85682e448c9ad755540e /kernel/bpf/syscall.c | |
| parent | 2341d6bb133d44caeba9fbdc851f8624739a84a2 (diff) | |
bpf: Introduce fd_idx
Typical program loading sequence involves creating bpf maps and applying
map FDs into bpf instructions in various places in the bpf program.
This job is done by libbpf that is using compiler generated ELF relocations
to patch certain instruction after maps are created and BTFs are loaded.
The goal of fd_idx is to allow bpf instructions to stay immutable
after compilation. At load time the libbpf would still create maps as usual,
but it wouldn't need to patch instructions. It would store map_fds into
__u32 fd_array[] and would pass that pointer to sys_bpf(BPF_PROG_LOAD).
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210514003623.28033-9-alexei.starovoitov@gmail.com
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 415865c49dd4..da7dc2406470 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -2089,7 +2089,7 @@ static bool is_perfmon_prog_type(enum bpf_prog_type prog_type) } /* last field in 'union bpf_attr' used by this command */ -#define BPF_PROG_LOAD_LAST_FIELD attach_prog_fd +#define BPF_PROG_LOAD_LAST_FIELD fd_array static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr) { |