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From: Kris Van Hees <kris.van.hees@oracle.com>
To: netdev@vger.kernel.org, bpf@vger.kernel.org,
	dtrace-devel@oss.oracle.com, linux-kernel@vger.kernel.org
Cc: rostedt@goodmis.org, mhiramat@kernel.org, acme@kernel.org,
	ast@kernel.org, daniel@iogearbox.net
Subject: [RFC PATCH 03/11] bpf: export proto for bpf_perf_event_output helper
Date: Mon, 20 May 2019 23:50:58 +0000 (UTC)
Message-ID: <201905202350.x4KNox5o024711@userv0121.oracle.com> (raw)

The bpf_perf_event_output helper is used by various tracer BPF program
types, but it was not visible outside of bpf_trace.c.  In order to make
it available to tracer BPF program types that are implemented elsewhere,
a function is added similar to bpf_get_trace_printk_proto() to query the
prototype (bpf_get_perf_event_output_proto()).

Signed-off-by: Kris Van Hees <kris.van.hees@oracle.com>
Reviewed-by: Nick Alcock <nick.alcock@oracle.com>
 include/linux/bpf.h      | 1 +
 kernel/trace/bpf_trace.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 7a40a3cd7ff2..e4bcb79656c4 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -479,6 +479,7 @@ bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *f
 int bpf_prog_calc_tag(struct bpf_prog *fp);
 const struct bpf_func_proto *bpf_get_trace_printk_proto(void);
+const struct bpf_func_proto *bpf_get_perf_event_output_proto(void);
 typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src,
 					unsigned long off, unsigned long len);
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index b496ffdf5f36..3d812238bc40 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -473,6 +473,12 @@ static const struct bpf_func_proto bpf_perf_event_output_proto = {
 	.arg5_type	= ARG_CONST_SIZE_OR_ZERO,
+const struct bpf_func_proto *bpf_get_perf_event_output_proto(void)
+	return &bpf_perf_event_output_proto;
 static DEFINE_PER_CPU(struct pt_regs, bpf_pt_regs);
 static DEFINE_PER_CPU(struct perf_sample_data, bpf_misc_sd);

             reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-20 23:50 Kris Van Hees [this message]
  -- strict thread matches above, loose matches on Subject: below --
2019-05-20 23:47 [RFC PATCH 00/11] bpf, trace, dtrace: DTrace BPF program type implementation and sample use Kris Van Hees
2019-05-21 20:39 ` [RFC PATCH 03/11] bpf: export proto for bpf_perf_event_output helper Kris Van Hees

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