selftests/bpf: add selftest that use test_libbpf_open

Web:        https://git.kernel.org/torvalds/c/f09b2e382e9a7053e3ae6f2fb6535efd5760cf5d
Commit:     f09b2e382e9a7053e3ae6f2fb6535efd5760cf5d
Parent:     864db336c677c288d81524c30a656804785902f9
Refname:    refs/heads/master
Author:     Jesper Dangaard Brouer <[email protected]>
AuthorDate: Thu Feb 8 12:48:27 2018 +0100
Committer:  Daniel Borkmann <[email protected]>
CommitDate: Fri Feb 9 00:25:12 2018 +0100

    selftests/bpf: add selftest that use test_libbpf_open
    
    This script test_libbpf.sh will be part of the 'make run_tests'
    invocation, but can also be invoked manually in this directory,
    and a verbose mode can be enabled via setting the environment
    variable $VERBOSE like:
    
     $ VERBOSE=yes ./test_libbpf.sh
    
    The script contains some tests that are commented out, as they
    currently fail.  They are reminders about what we need to improve
    for the libbpf loader library.
    
    Signed-off-by: Jesper Dangaard Brouer <[email protected]>
    Signed-off-by: Daniel Borkmann <[email protected]>
---
 tools/testing/selftests/bpf/Makefile       | 14 +++++++--
 tools/testing/selftests/bpf/test_libbpf.sh | 49 ++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 3f48da0866ba..5c43c187f27c 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -13,6 +13,7 @@ endif
 CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include
 LDLIBS += -lcap -lelf -lrt -lpthread
 
+# Order correspond to 'make run_tests' order
 TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
 	test_align test_verifier_log test_dev_cgroup test_tcpbpf_user
 
@@ -20,17 +21,26 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test
 	test_pkt_md_access.o test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o     \
 	sockmap_verdict_prog.o dev_cgroup.o sample_ret0.o test_tracepoint.o \
 	test_l4lb_noinline.o test_xdp_noinline.o test_stacktrace_map.o \
-	sample_map_ret0.o test_tcpbpf_kern.o test_libbpf_open
+	sample_map_ret0.o test_tcpbpf_kern.o
 
-TEST_PROGS := test_kmod.sh test_xdp_redirect.sh test_xdp_meta.sh \
+# Order correspond to 'make run_tests' order
+TEST_PROGS := test_kmod.sh \
+	test_libbpf.sh \
+	test_xdp_redirect.sh \
+	test_xdp_meta.sh \
 	test_offload.py
 
+# Compile but not part of 'make run_tests'
+TEST_GEN_PROGS_EXTENDED = test_libbpf_open
+
 include ../lib.mk
 
 BPFOBJ := $(OUTPUT)/libbpf.a cgroup_helpers.c
 
 $(TEST_GEN_PROGS): $(BPFOBJ)
 
+$(TEST_GEN_PROGS_EXTENDED): $(OUTPUT)/libbpf.a
+
 .PHONY: force
 
 # force a rebuild of BPFOBJ when its dependencies are updated
diff --git a/tools/testing/selftests/bpf/test_libbpf.sh b/tools/testing/selftests/bpf/test_libbpf.sh
new file mode 100755
index 000000000000..d97dc914cd49
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_libbpf.sh
@@ -0,0 +1,49 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+export TESTNAME=test_libbpf
+
+# Determine selftest success via shell exit code
+exit_handler()
+{
+	if (( $? == 0 )); then
+		echo "selftests: $TESTNAME [PASS]";
+	else
+		echo "$TESTNAME: failed at file $LAST_LOADED" 1>&2
+		echo "selftests: $TESTNAME [FAILED]";
+	fi
+}
+
+libbpf_open_file()
+{
+	LAST_LOADED=$1
+	if [ -n "$VERBOSE" ]; then
+	    ./test_libbpf_open $1
+	else
+	    ./test_libbpf_open --quiet $1
+	fi
+}
+
+# Exit script immediately (well catched by trap handler) if any
+# program/thing exits with a non-zero status.
+set -e
+
+# (Use 'trap -l' to list meaning of numbers)
+trap exit_handler 0 2 3 6 9
+
+libbpf_open_file test_l4lb.o
+
+# TODO: fix libbpf to load noinline functions
+# [warning] libbpf: incorrect bpf_call opcode
+#libbpf_open_file test_l4lb_noinline.o
+
+# TODO: fix test_xdp_meta.c to load with libbpf
+# [warning] libbpf: test_xdp_meta.o doesn't provide kernel version
+#libbpf_open_file test_xdp_meta.o
+
+# TODO: fix libbpf to handle .eh_frame
+# [warning] libbpf: relocation failed: no section(10)
+#libbpf_open_file ../../../../samples/bpf/tracex3_kern.o
+
+# Success
+exit 0
--
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