bpf_vprintk functions similarly to BPF_SEQ_PRINTF and BPF_SNPRINTF macros elsewhere in the file - it allows use of bpf_trace_vprintk without manual conversion of varargs to u64 array.
Like the bpf_printk macro, bpf_vprintk is meant to be the main interface to the bpf_trace_vprintk helper and thus is uncapitalized.
Signed-off-by: Dave Marchevsky davemarchevsky@fb.com --- tools/lib/bpf/bpf_helpers.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h index b9987c3efa3c..43c8115956c3 100644 --- a/tools/lib/bpf/bpf_helpers.h +++ b/tools/lib/bpf/bpf_helpers.h @@ -224,4 +224,22 @@ enum libbpf_tristate { ___param, sizeof(___param)); \ })
+/* + * bpf_vprintk wraps the bpf_trace_printk helper with variadic arguments + * instead of an array of u64. + */ +#define bpf_vprintk(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_trace_vprintk(___fmt, sizeof(___fmt), \ + ___param, sizeof(___param)); \ +}) + #endif