nixpkgs/nixos/tests/bpf.nix
Dominique Martinet fd5d7b2586 tests/bpf: add module BTF test
bpftrace 0.17 added module BTF support, check this works.

On bpftrace 0.16, this failed with the following error:
> ERROR: kfunc:nft_trans_alloc_gfp: no BTF data for the function
2023-02-03 16:53:17 -06:00

34 lines
1.2 KiB
Nix

import ./make-test-python.nix ({ pkgs, ... }: {
name = "bpf";
meta.maintainers = with pkgs.lib.maintainers; [ martinetd ];
nodes.machine = { pkgs, ... }: {
programs.bcc.enable = true;
environment.systemPackages = with pkgs; [ bpftrace ];
};
testScript = ''
## bcc
# syscount -d 1 stops 1s after probe started so is good for that
print(machine.succeed("syscount -d 1"))
## bpftrace
# list probes
machine.succeed("bpftrace -l")
# simple BEGIN probe (user probe on bpftrace itself)
print(machine.succeed("bpftrace -e 'BEGIN { print(\"ok\"); exit(); }'"))
# tracepoint
print(machine.succeed("bpftrace -e 'tracepoint:syscalls:sys_enter_* { print(probe); exit() }'"))
# kprobe
print(machine.succeed("bpftrace -e 'kprobe:schedule { print(probe); exit() }'"))
# BTF
print(machine.succeed("bpftrace -e 'kprobe:schedule { "
" printf(\"tgid: %d\", ((struct task_struct*) curtask)->tgid); exit() "
"}'"))
# module BTF (bpftrace >= 0.17)
print(machine.succeed("bpftrace -e 'kfunc:nft_trans_alloc_gfp { "
" printf(\"portid: %d\\n\",args->ctx->portid); "
"} BEGIN { exit() }'"))
'';
})