Commit 88f7fe72 authored by Song Liu's avatar Song Liu Committed by Daniel Borkmann
Browse files

libbpf: Support test run of raw tracepoint programs 



Add bpf_prog_test_run_opts() with support of new fields in bpf_attr.test,
namely, flags and cpu. Also extend _opts operations to support outputs via
opts.

Signed-off-by: default avatarSong Liu <songliubraving@fb.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAndrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200925205432.1777-3-songliubraving@fb.com
parent 1b4d60ec

tools/lib/bpf/bpf.c

+31 −0
Original line number Diff line number Diff line
@@ -712,6 +712,37 @@ int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 
	return ret;

}



int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts)

{

	union bpf_attr attr;

	int ret;



	if (!OPTS_VALID(opts, bpf_test_run_opts))

		return -EINVAL;



	memset(&attr, 0, sizeof(attr));

	attr.test.prog_fd = prog_fd;

	attr.test.cpu = OPTS_GET(opts, cpu, 0);

	attr.test.flags = OPTS_GET(opts, flags, 0);

	attr.test.repeat = OPTS_GET(opts, repeat, 0);

	attr.test.duration = OPTS_GET(opts, duration, 0);

	attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0);

	attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0);

	attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0);

	attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0);

	attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL));

	attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL));

	attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL));

	attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL));



	ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));

	OPTS_SET(opts, data_size_out, attr.test.data_size_out);

	OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out);

	OPTS_SET(opts, duration, attr.test.duration);

	OPTS_SET(opts, retval, attr.test.retval);

	return ret;

}



static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd)

{

	union bpf_attr attr;

tools/lib/bpf/bpf.h

+26 −0
Original line number Diff line number Diff line
@@ -251,6 +251,32 @@ struct bpf_prog_bind_opts { 


LIBBPF_API int bpf_prog_bind_map(int prog_fd, int map_fd,

				 const struct bpf_prog_bind_opts *opts);



struct bpf_test_run_opts {

	size_t sz; /* size of this struct for forward/backward compatibility */

	const void *data_in; /* optional */

	void *data_out;      /* optional */

	__u32 data_size_in;

	__u32 data_size_out; /* in: max length of data_out

			      * out: length of data_out

			      */

	const void *ctx_in; /* optional */

	void *ctx_out;      /* optional */

	__u32 ctx_size_in;

	__u32 ctx_size_out; /* in: max length of ctx_out

			     * out: length of cxt_out

			     */

	__u32 retval;        /* out: return code of the BPF program */

	int repeat;

	__u32 duration;      /* out: average per repetition in ns */

	__u32 flags;

	__u32 cpu;

};

#define bpf_test_run_opts__last_field cpu



LIBBPF_API int bpf_prog_test_run_opts(int prog_fd,

				      struct bpf_test_run_opts *opts);



#ifdef __cplusplus

} /* extern "C" */

#endif

tools/lib/bpf/libbpf.map

+1 −0
Original line number Diff line number Diff line
@@ -303,6 +303,7 @@ LIBBPF_0.1.0 { 
LIBBPF_0.2.0 {

	global:

		bpf_prog_bind_map;

		bpf_prog_test_run_opts;

		bpf_program__section_name;

		perf_buffer__buffer_cnt;

		perf_buffer__buffer_fd;

tools/lib/bpf/libbpf_internal.h

+5 −0
Original line number Diff line number Diff line
@@ -136,6 +136,11 @@ static inline bool libbpf_validate_opts(const char *opts, 
	((opts) && opts->sz >= offsetofend(typeof(*(opts)), field))

#define OPTS_GET(opts, field, fallback_value) \

	(OPTS_HAS(opts, field) ? (opts)->field : fallback_value)

#define OPTS_SET(opts, field, value)		\

	do {					\

		if (OPTS_HAS(opts, field))	\

			(opts)->field = value;	\

	} while (0)



int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz);

int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz);

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