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Mon, 27 Oct 2025 06:54:39 -0700 (PDT) Received: from pengdl-pc.mioffice.cn ([43.224.245.249]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-33fed70a83csm8574361a91.4.2025.10.27.06.54.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Oct 2025 06:54:38 -0700 (PDT) From: Donglin Peng To: ast@kernel.org Cc: linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Donglin Peng , Eduard Zingerman , Andrii Nakryiko , Alan Maguire , Song Liu , pengdonglin Subject: [RFC PATCH v3 2/3] selftests/bpf: add tests for BTF type permutation Date: Mon, 27 Oct 2025 21:54:22 +0800 Message-Id: <20251027135423.3098490-3-dolinux.peng@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251027135423.3098490-1-dolinux.peng@gmail.com> References: <20251027135423.3098490-1-dolinux.peng@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Verify that BTF type permutation functionality works correctly. Cc: Eduard Zingerman Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Alan Maguire Cc: Song Liu Signed-off-by: pengdonglin Signed-off-by: Donglin Peng --- tools/testing/selftests/bpf/prog_tests/btf.c | 109 ++++++++++++++++--- 1 file changed, 94 insertions(+), 15 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/s= elftests/bpf/prog_tests/btf.c index 8a9ba4292109..0688449613d4 100644 --- a/tools/testing/selftests/bpf/prog_tests/btf.c +++ b/tools/testing/selftests/bpf/prog_tests/btf.c @@ -6935,14 +6935,18 @@ struct btf_raw_data { __u32 str_sec_size; }; =20 -struct btf_dedup_test { +struct btf_dedup_permute_test { const char *descr; struct btf_raw_data input; struct btf_raw_data expect; - struct btf_dedup_opts opts; + bool permute; + struct btf_dedup_opts dedup_opts; + struct btf_permute_opts permute_opts; }; =20 -static struct btf_dedup_test dedup_tests[] =3D { +static __u32 permute_ids_sort_by_kind_name[] =3D {3, 4, 5, 8, 11, 14, 6, 9= , 12, 15, 7, 10, 13, 16, 1, 2}; + +static struct btf_dedup_permute_test dedup_permute_tests[] =3D { =20 { .descr =3D "dedup: unused strings filtering", @@ -7105,7 +7109,7 @@ static struct btf_dedup_test dedup_tests[] =3D { }, BTF_STR_SEC("\0s\0x"), }, - .opts =3D { + .dedup_opts =3D { .force_collisions =3D true, /* force hash collisions */ }, }, @@ -7151,7 +7155,7 @@ static struct btf_dedup_test dedup_tests[] =3D { }, BTF_STR_SEC("\0s\0x"), }, - .opts =3D { + .dedup_opts =3D { .force_collisions =3D true, /* force hash collisions */ }, }, @@ -7354,7 +7358,7 @@ static struct btf_dedup_test dedup_tests[] =3D { }, BTF_STR_SEC("\0.bss\0t"), }, - .opts =3D { + .dedup_opts =3D { .force_collisions =3D true }, }, @@ -8022,6 +8026,72 @@ static struct btf_dedup_test dedup_tests[] =3D { BTF_STR_SEC("\0foo\0x\0y\0foo_ptr"), }, }, +{ + .descr =3D "permute: func/func_param/struct/struct_member tags", + .input =3D { + .raw_types =3D { + /* int */ + BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */ + /* void f(int a1, int a2) */ + BTF_FUNC_PROTO_ENC(0, 2), /* [2] */ + BTF_FUNC_PROTO_ARG_ENC(NAME_NTH(1), 1), + BTF_FUNC_PROTO_ARG_ENC(NAME_NTH(2), 1), + BTF_FUNC_ENC(NAME_NTH(3), 2), /* [3] */ + /* struct t {int m1; int m2;} */ + BTF_STRUCT_ENC(NAME_NTH(4), 2, 8), /* [4] */ + BTF_MEMBER_ENC(NAME_NTH(5), 1, 0), + BTF_MEMBER_ENC(NAME_NTH(6), 1, 32), + /* tag -> f: tag1, tag2, tag3 */ + BTF_DECL_TAG_ENC(NAME_NTH(7), 3, -1), /* [5] */ + BTF_DECL_TAG_ENC(NAME_NTH(8), 3, -1), /* [6] */ + BTF_DECL_TAG_ENC(NAME_NTH(9), 3, -1), /* [7] */ + /* tag -> f/a2: tag1, tag2, tag3 */ + BTF_DECL_TAG_ENC(NAME_NTH(7), 3, 1), /* [8] */ + BTF_DECL_TAG_ENC(NAME_NTH(8), 3, 1), /* [9] */ + BTF_DECL_TAG_ENC(NAME_NTH(9), 3, 1), /* [10] */ + /* tag -> t: tag1, tag2, tag3 */ + BTF_DECL_TAG_ENC(NAME_NTH(7), 4, -1), /* [11] */ + BTF_DECL_TAG_ENC(NAME_NTH(8), 4, -1), /* [12] */ + BTF_DECL_TAG_ENC(NAME_NTH(9), 4, -1), /* [13] */ + /* tag -> t/m2: tag1, tag3 */ + BTF_DECL_TAG_ENC(NAME_NTH(7), 4, 1), /* [14] */ + BTF_DECL_TAG_ENC(NAME_NTH(8), 4, 1), /* [15] */ + BTF_DECL_TAG_ENC(NAME_NTH(9), 4, 1), /* [16] */ + BTF_END_RAW, + }, + BTF_STR_SEC("\0a1\0a2\0f\0t\0m1\0m2\0tag1\0tag2\0tag3"), + }, + .expect =3D { + .raw_types =3D { + BTF_FUNC_ENC(NAME_NTH(3), 16), /* [1] */ + BTF_STRUCT_ENC(NAME_NTH(4), 2, 8), /* [2] */ + BTF_MEMBER_ENC(NAME_NTH(5), 15, 0), + BTF_MEMBER_ENC(NAME_NTH(6), 15, 32), + BTF_DECL_TAG_ENC(NAME_NTH(7), 1, -1), /* [3] */ + BTF_DECL_TAG_ENC(NAME_NTH(7), 1, 1), /* [4] */ + BTF_DECL_TAG_ENC(NAME_NTH(7), 2, -1), /* [5] */ + BTF_DECL_TAG_ENC(NAME_NTH(7), 2, 1), /* [6] */ + BTF_DECL_TAG_ENC(NAME_NTH(8), 1, -1), /* [7] */ + BTF_DECL_TAG_ENC(NAME_NTH(8), 1, 1), /* [8] */ + BTF_DECL_TAG_ENC(NAME_NTH(8), 2, -1), /* [9] */ + BTF_DECL_TAG_ENC(NAME_NTH(8), 2, 1), /* [10] */ + BTF_DECL_TAG_ENC(NAME_NTH(9), 1, -1), /* [11] */ + BTF_DECL_TAG_ENC(NAME_NTH(9), 1, 1), /* [12] */ + BTF_DECL_TAG_ENC(NAME_NTH(9), 2, -1), /* [13] */ + BTF_DECL_TAG_ENC(NAME_NTH(9), 2, 1), /* [14] */ + BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [15] */ + BTF_FUNC_PROTO_ENC(0, 2), /* [16] */ + BTF_FUNC_PROTO_ARG_ENC(NAME_NTH(1), 15), + BTF_FUNC_PROTO_ARG_ENC(NAME_NTH(2), 15), + BTF_END_RAW, + }, + BTF_STR_SEC("\0a1\0a2\0f\0t\0m1\0m2\0tag1\0tag2\0tag3"), + }, + .permute =3D true, + .permute_opts =3D { + .ids =3D permute_ids_sort_by_kind_name, + }, +}, }; =20 static int btf_type_size(const struct btf_type *t) @@ -8078,9 +8148,9 @@ static void dump_btf_strings(const char *strs, __u32 = len) } } =20 -static void do_test_dedup(unsigned int test_num) +static void do_test_dedup_permute(unsigned int test_num) { - struct btf_dedup_test *test =3D &dedup_tests[test_num - 1]; + struct btf_dedup_permute_test *test =3D &dedup_permute_tests[test_num - 1= ]; __u32 test_nr_types, expect_nr_types, test_btf_size, expect_btf_size; const struct btf_header *test_hdr, *expect_hdr; struct btf *test_btf =3D NULL, *expect_btf =3D NULL; @@ -8124,11 +8194,20 @@ static void do_test_dedup(unsigned int test_num) goto done; } =20 - test->opts.sz =3D sizeof(test->opts); - err =3D btf__dedup(test_btf, &test->opts); - if (CHECK(err, "btf_dedup failed errno:%d", err)) { - err =3D -1; - goto done; + if (test->permute) { + test->permute_opts.sz =3D sizeof(test->permute_opts); + err =3D btf__permute(test_btf, &test->permute_opts); + if (CHECK(err, "btf_permute failed errno:%d", err)) { + err =3D -1; + goto done; + } + } else { + test->dedup_opts.sz =3D sizeof(test->dedup_opts); + err =3D btf__dedup(test_btf, &test->dedup_opts); + if (CHECK(err, "btf_dedup failed errno:%d", err)) { + err =3D -1; + goto done; + } } =20 test_btf_data =3D btf__raw_data(test_btf, &test_btf_size); @@ -8249,7 +8328,7 @@ void test_btf(void) do_test_file(i); for (i =3D 1; i <=3D ARRAY_SIZE(info_raw_tests); i++) do_test_info_raw(i); - for (i =3D 1; i <=3D ARRAY_SIZE(dedup_tests); i++) - do_test_dedup(i); + for (i =3D 1; i <=3D ARRAY_SIZE(dedup_permute_tests); i++) + do_test_dedup_permute(i); test_pprint(); } --=20 2.34.1