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| author |   Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2025-07-03 13:48:15 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2025-07-03 19:30:07 -0700 |
| commit | 21a3afc76a317b9fb214c5afcfd5e1587b2ae9b3 (patch) | |
| tree | ae96587b69145b4d1f1e383c516e7916d6be93d9 | |
| parent | bpf: Report rqspinlock deadlocks/timeout to BPF stderr (diff) | |
| download | wireguard-linux-21a3afc76a317b9fb214c5afcfd5e1587b2ae9b3.tar.xz wireguard-linux-21a3afc76a317b9fb214c5afcfd5e1587b2ae9b3.zip | |
libbpf: Add bpf_stream_printk() macro
Add a convenience macro to print data to the BPF streams. BPF_STDOUT and
BPF_STDERR stream IDs in the vmlinux.h can be passed to the macro to
print to the respective streams.
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250703204818.925464-10-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
| -rw-r--r-- | tools/lib/bpf/bpf_helpers.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h index a50773d4616e..76b127a9f24d 100644 --- a/tools/lib/bpf/bpf_helpers.h +++ b/tools/lib/bpf/bpf_helpers.h @@ -314,6 +314,22 @@ enum libbpf_tristate { ___param, sizeof(___param)); \ }) +extern int bpf_stream_vprintk(int stream_id, const char *fmt__str, const void *args, + __u32 len__sz, void *aux__prog) __weak __ksym; + +#define bpf_stream_printk(stream_id, fmt, args...) \ +({ \ + static const char ___fmt[] = fmt; \ + unsigned long long ___param[___bpf_narg(args)]; \ + \ + _Pragma("GCC diagnostic push") \ + _Pragma("GCC diagnostic ignored \"-Wint-conversion\"") \ + ___bpf_fill(___param, args); \ + _Pragma("GCC diagnostic pop") \ + \ + bpf_stream_vprintk(stream_id, ___fmt, ___param, sizeof(___param), NULL);\ +}) + /* Use __bpf_printk when bpf_printk call has 3 or fewer fmt args * Otherwise use __bpf_vprintk */ |