Re: [PATCH bpf-next v5 9/9] selftest/bpf: Implement tests for bpftool gen min_core_btf

This commit implements some integration tests for "BTFGen". The goal
of such tests is to verify that the generated BTF file contains the
expected types.

Signed-off-by: Mauricio Vásquez <redacted>
Signed-off-by: Rafael David Tinoco <redacted>
Signed-off-by: Lorenzo Fontana <redacted>
Signed-off-by: Leonardo Di Donato <redacted>
---
 tools/testing/selftests/bpf/.gitignore        |   1 +
 tools/testing/selftests/bpf/Makefile          |   4 +-
 .../selftests/bpf/progs/btfgen_btf_source.c   |  12 +
 .../bpf/progs/btfgen_primitives_array.c       |  39 +++
 .../bpf/progs/btfgen_primitives_struct.c      |  40 +++
 .../bpf/progs/btfgen_primitives_struct2.c     |  44 ++++
 .../bpf/progs/btfgen_primitives_union.c       |  32 +++
 tools/testing/selftests/bpf/test_bpftool.c    | 228 ++++++++++++++++++
 8 files changed, 399 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/progs/btfgen_btf_source.c
 create mode 100644 tools/testing/selftests/bpf/progs/btfgen_primitives_array.c
 create mode 100644 tools/testing/selftests/bpf/progs/btfgen_primitives_struct.c
 create mode 100644 tools/testing/selftests/bpf/progs/btfgen_primitives_struct2.c
 create mode 100644 tools/testing/selftests/bpf/progs/btfgen_primitives_union.c
 create mode 100644 tools/testing/selftests/bpf/test_bpftool.c

diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
index 1dad8d617da8..308cd5b9cfc4 100644
--- a/tools/testing/selftests/bpf/.gitignore
+++ b/tools/testing/selftests/bpf/.gitignore

@@ -41,3 +41,4 @@ test_cpp
 *.tmp
 xdpxceiver
 xdp_redirect_multi
+test_bpftool

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 945f92d71db3..afc9bff6545d 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile

@@ -38,7 +38,8 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
 	test_sock test_sockmap get_cgroup_id_user \
 	test_cgroup_storage \
 	test_tcpnotify_user test_sysctl \
-	test_progs-no_alu32
+	test_progs-no_alu32 \
+	test_bpftool

 
 # Also test bpf-gcc, if present
 ifneq ($(BPF_GCC),)

@@ -212,6 +213,7 @@ $(OUTPUT)/xdping: $(TESTING_HELPERS)
 $(OUTPUT)/flow_dissector_load: $(TESTING_HELPERS)
 $(OUTPUT)/test_maps: $(TESTING_HELPERS)
 $(OUTPUT)/test_verifier: $(TESTING_HELPERS)
+$(OUTPUT)/test_bpftool:
 
 BPFTOOL ?= $(DEFAULT_BPFTOOL)
 $(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile)    \

diff --git a/tools/testing/selftests/bpf/test_bpftool.c b/tools/testing/selftests/bpf/test_bpftool.c
new file mode 100644
index 000000000000..ca7facc582d5
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_bpftool.c

@@ -0,0 +1,228 @@
+// SPDX-License-Identifier: GPL-2.0-only