nixpkgs/nixos/tests/bpf.nix
Dominique Martinet 0bf9c7660f bpftrace: fix tcp*.bt/runqlat.bt scripts
tcp*.bt scripts tried to include glibc headers, which didn't work on
nixos because bpftrace tried to call clang-major with some options to
get the paths, but we never told it where to find it.
Give bpftrace the path directly instead of giving it a path to clang.

runqlat.bt doesn't work with glibc headers and requires kernel headers
which are no longer extracted, just provide its value.

Note the default clang output also had some clang-internal headers, but
these seem to be included anyway through libclang API without having to
give them here, so we only pass the glibc ones.

While here:
- also backport another bpftrace patch that made the tcp*.bt tools to
actually not require these includes
- and add tests that we can include these.

Co-authored-by: Arian van Putten <arian.vanputten@gmail.com>
2024-06-23 21:07:42 +09:00

40 lines
1.5 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\\n\"); 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\\n\", ((struct task_struct*) curtask)->tgid); exit() "
"}'"))
# module BTF (bpftrace >= 0.17)
# test is currently disabled on aarch64 as kfunc does not work there yet
# https://github.com/iovisor/bpftrace/issues/2496
print(machine.succeed("uname -m | grep aarch64 || "
"bpftrace -e 'kfunc:nft_trans_alloc_gfp { "
" printf(\"portid: %d\\n\", args->ctx->portid); "
"} BEGIN { exit() }'"))
# glibc includes
print(machine.succeed("bpftrace -e '#include <errno.h>\n"
"BEGIN { printf(\"ok %d\\n\", EINVAL); exit(); }'"))
'';
})