linux-kernel - [PATCH bpf-next v5 4/9] bpf: selftests: test_loader: Support __btf

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Message-ID: <660ea7f2fdbdd5103bc1af87c9fc931f05327926.1702325874.git.dxu@dxuuu.xyz>
Date:   Mon, 11 Dec 2023 13:20:08 -0700
From:   Daniel Xu <dxu@...uu.xyz>
To:     ast@...nel.org, andrii@...nel.org, shuah@...nel.org,
        daniel@...earbox.net, steffen.klassert@...unet.com,
        antony.antony@...unet.com, alexei.starovoitov@...il.com,
        yonghong.song@...ux.dev, eddyz87@...il.com, eyal.birger@...il.com
Cc:     mykolal@...com, martin.lau@...ux.dev, song@...nel.org,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        devel@...ux-ipsec.org, netdev@...r.kernel.org
Subject: [PATCH bpf-next v5 4/9] bpf: selftests: test_loader: Support __btf_path() annotation

This commit adds support for per-prog btf_custom_path. This is necessary
for testing CO-RE relocations on non-vmlinux types using test_loader
infrastructure.

Acked-by: Andrii Nakryiko <andrii@...nel.org>
Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 tools/testing/selftests/bpf/progs/bpf_misc.h | 1 +
 tools/testing/selftests/bpf/test_loader.c    | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/bpf_misc.h b/tools/testing/selftests/bpf/progs/bpf_misc.h
index 799fff4995d8..2fd59970c43a 100644
--- a/tools/testing/selftests/bpf/progs/bpf_misc.h
+++ b/tools/testing/selftests/bpf/progs/bpf_misc.h
@@ -71,6 +71,7 @@
 #define __retval_unpriv(val)	__attribute__((btf_decl_tag("comment:test_retval_unpriv="#val)))
 #define __auxiliary		__attribute__((btf_decl_tag("comment:test_auxiliary")))
 #define __auxiliary_unpriv	__attribute__((btf_decl_tag("comment:test_auxiliary_unpriv")))
+#define __btf_path(path)	__attribute__((btf_decl_tag("comment:test_btf_path=" path)))
 
 /* Convenience macro for use with 'asm volatile' blocks */
 #define __naked __attribute__((naked))
diff --git a/tools/testing/selftests/bpf/test_loader.c b/tools/testing/selftests/bpf/test_loader.c
index a350ecdfba4a..74ceb7877ae2 100644
--- a/tools/testing/selftests/bpf/test_loader.c
+++ b/tools/testing/selftests/bpf/test_loader.c
@@ -27,6 +27,7 @@
 #define TEST_TAG_RETVAL_PFX_UNPRIV "comment:test_retval_unpriv="
 #define TEST_TAG_AUXILIARY "comment:test_auxiliary"
 #define TEST_TAG_AUXILIARY_UNPRIV "comment:test_auxiliary_unpriv"
+#define TEST_BTF_PATH "comment:test_btf_path="
 
 /* Warning: duplicated in bpf_misc.h */
 #define POINTER_VALUE	0xcafe4all
@@ -58,6 +59,7 @@ struct test_spec {
 	const char *prog_name;
 	struct test_subspec priv;
 	struct test_subspec unpriv;
+	const char *btf_custom_path;
 	int log_level;
 	int prog_flags;
 	int mode_mask;
@@ -288,6 +290,8 @@ static int parse_test_spec(struct test_loader *tester,
 					goto cleanup;
 				update_flags(&spec->prog_flags, flags, clear);
 			}
+		} else if (str_has_pfx(s, TEST_BTF_PATH)) {
+			spec->btf_custom_path = s + sizeof(TEST_BTF_PATH) - 1;
 		}
 	}
 
@@ -578,6 +582,9 @@ void run_subtest(struct test_loader *tester,
 		}
 	}
 
+	/* Implicitly reset to NULL if next test case doesn't specify */
+	open_opts->btf_custom_path = spec->btf_custom_path;
+
 	tobj = bpf_object__open_mem(obj_bytes, obj_byte_cnt, open_opts);
 	if (!ASSERT_OK_PTR(tobj, "obj_open_mem")) /* shouldn't happen */
 		goto subtest_cleanup;
-- 
2.42.1