kernel-selftest: add it

The framework for kernel-selftest, this framework contains many aspect, such as bpf, we should enable bpf kernel feature, this enable bpf syscall.

How to test?
On target, enter directory: /opt/kselftest/bpf/, run "./test_align 0 11"
this command test all the bpf align testcases.

Results:

     Test   0: mov ... PASS
     Test   1: shift ... PASS
     Test   2: addsub ... PASS
     Test   3: mul ... PASS
     Test   4: unknown shift ... PASS
     Test   5: unknown mul ... PASS
     Test   6: packet const offset ... PASS
     Test   7: packet variable offset ... PASS
     Test   8: packet variable offset 2 ... PASS
     Test   9: dubious pointer arithmetic ... PASS

Test 10: variable subtraction ... PASS Test 11: pointer variable subtraction ... PASS
Results: 12 pass 0 fail

Signed-off-by Dengke Du <[email protected]>

---
  .../kernel-selftest/kernel-selftest.bb             | 94 ++++++++++++++++++++++
  meta/recipes-kernel/linux/linux-yocto.inc          |  1 +
  2 files changed, 95 insertions(+)

create mode 100644 meta/recipes-kernel/kernel-selftest/kernel-selftest.bb

meta/recipes-kernel/kernel-selftest/kernel-selftest.bb new file +94 -0

new file mode 100644
index 0000000..c976e7b
@@ -0,0 +1,94 @@
+SUMMARY = "Kernel selftest for Linux"
+DESCRIPTION = "Kernel selftest for Linux"
+LICENSE = "GPLv2"
+
+DEPENDS = " \
+    elfutils \
+    libcap \
+    libcap-ng \
+    fuse \
+    util-linux \
+    rsync-native \
+"
+
+do_configure[depends] += "virtual/kernel:do_shared_workdir"
+
+inherit linux-kernel-base kernel-arch
+
+do_populate_lic[depends] += "virtual/kernel:do_patch"
+
+inherit kernelsrc
+
+S = "${WORKDIR}/${BP}"
+
+# The LDFLAGS is required or some old kernels fails due missing
+# symbols and this is preferred than requiring patches to every old
+# supported kernel.
+LDFLAGS="-ldl -lutil"
+
+EXTRA_OEMAKE = '\
+    CROSS_COMPILE=${TARGET_PREFIX} \
+    ARCH=${ARCH} \
+    CC="${CC}" \
+    AR="${AR}" \
+    LD="${LD}" \
+    EXTRA_CFLAGS="-ldw" \
+    ${PACKAGECONFIG_CONFARGS} \
+'
+
+EXTRA_OEMAKE += "\
+    'DESTDIR=${D}' \
+    'prefix=${prefix}' \
+    'bindir=${bindir}' \
+    'sharedir=${datadir}' \
+    'sysconfdir=${sysconfdir}' \
+    'sharedir=${@os.path.relpath(datadir, prefix)}' \
+    'mandir=${@os.path.relpath(mandir, prefix)}' \
+    'infodir=${@os.path.relpath(infodir, prefix)}' \
+"
+
+KERNEL_SELFTEST_SRC ?= "Makefile \
+             include \
+             tools \
+"
+
+# Add bpf selftest now, other can be added later.
+do_compile () {
+	# Linux kernel build system is expected to do the right thing
+	unset CFLAGS
+	oe_runmake -C ${S}/tools/testing/selftests/bpf
+}
+
+# On target, enter /opt/kselftest/bpf directory, run "./test_align 0 11"
+# The test_align testcase test the bpf instruction set, the testcase defined here:
+# https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/tree/tools/testing/selftests/bpf/test_align.c#n47
+do_install () {
+	# Linux kernel build system is expected to do the right thing
+	unset CFLAGS
+	mkdir -p ${D}/opt/kselftest/bpf
+	install -m 0755 ${B}/tools/testing/selftests/bpf/test_align ${D}/opt/kselftest/bpf/
+}
+
+do_configure[prefuncs] += "copy_perf_source_from_kernel remove_clang_related"
+python copy_perf_source_from_kernel() {
+    sources = (d.getVar("KERNEL_SELFTEST_SRC") or "").split()
+    src_dir = d.getVar("STAGING_KERNEL_DIR")
+    dest_dir = d.getVar("S")
+    bb.utils.mkdirhier(dest_dir)
+    for s in sources:
+        src = oe.path.join(src_dir, s)
+        dest = oe.path.join(dest_dir, s)
+        if os.path.isdir(src):
+            oe.path.copytree(src, dest)
+        else:
+            bb.utils.copyfile(src, dest)
+}
+
+remove_clang_related() {
+	sed -i -e '/test_pkt_access/d' -e '/test_pkt_md_access/d' ${S}/tools/testing/selftests/bpf/Makefile
+}
+
+PACKAGE_ARCH = "${MACHINE_ARCH}"
+
+INHIBIT_PACKAGE_DEBUG_SPLIT="1"
+FILES_${PN} += "/opt/kselftest/bpf/*"

meta/recipes-kernel/linux/linux-yocto.inc +1 -0

index 1ebfb60..362d6d8 100644
@@ -72,3 +72,4 @@ addtask kernel_configcheck after do_configure before do_compile
 
  # enable kernel-sample for oeqa/runtime/cases's ksample.py test
  KERNEL_FEATURES_append_qemuall=" features/kernel-sample/kernel-sample.scc"
+KERNEL_FEATURES_append = " ${@bb.utils.contains('DISTRO_FEATURES', 'ptest', 'features/bpf/bpf.scc', '', d)}"