Commit 2cf7b7ff authored by Toke Høiland-Jørgensen's avatar Toke Høiland-Jørgensen Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add selftest for calling global functions from freplace 



Add a selftest that calls a global function with a context object parameter
from an freplace function to check that the program context type is
correctly converted to the freplace target when fetching the context type
from the kernel BTF.

v2:
- Trim includes
- Get rid of global function
- Use __noinline

Signed-off-by: default avatarToke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20220606075253.28422-2-toke@redhat.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent f858c2b2

tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c

+14 −0
Original line number Diff line number Diff line
@@ -395,6 +395,18 @@ static void test_func_map_prog_compatibility(void) 
				     "./test_attach_probe.o");

}



static void test_func_replace_global_func(void)

{

	const char *prog_name[] = {

		"freplace/test_pkt_access",

	};



	test_fexit_bpf2bpf_common("./freplace_global_func.o",

				  "./test_pkt_access.o",

				  ARRAY_SIZE(prog_name),

				  prog_name, false, NULL);

}



/* NOTE: affect other tests, must run in serial mode */

void serial_test_fexit_bpf2bpf(void)

{
@@ -416,4 +428,6 @@ void serial_test_fexit_bpf2bpf(void) 
		test_func_replace_multi();

	if (test__start_subtest("fmod_ret_freplace"))

		test_fmod_ret_freplace();

	if (test__start_subtest("func_replace_global_func"))

		test_func_replace_global_func();

}

tools/testing/selftests/bpf/progs/freplace_global_func.c

0 → 100644
+18 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <linux/bpf.h>

#include <bpf/bpf_helpers.h>



__noinline

int test_ctx_global_func(struct __sk_buff *skb)

{

	volatile int retval = 1;

	return retval;

}



SEC("freplace/test_pkt_access")

int new_test_pkt_access(struct __sk_buff *skb)

{

	return test_ctx_global_func(skb);

}



char _license[] SEC("license") = "GPL";