selftests/bpf: Add missing files required by test_bpftool.sh for installing

test_bpftool.sh relies on bpftool and test_bpftool.py.

'make install' will install bpftool to INSTALL_PATH/bpf/bpftool, and
export it to PATH so that it can be used after installing.

Signed-off-by: Li Zhijian <[e-mail]>
Signed-off-by: Alexei Starovoitov <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

tools/testing/selftests/bpf/Makefile

···
 
 TEST_PROGS_EXTENDED := with_addr.sh \
 	with_tunnels.sh \
-	test_xdp_vlan.sh
+	test_xdp_vlan.sh test_bpftool.py
 
 # Compile but not part of 'make run_tests'
 TEST_GEN_PROGS_EXTENDED = test_sock_addr test_skb_cgroup_id_user \
···
 		    OUTPUT=$(SCRATCH_DIR)/ VMLINUX_BTF=$(VMLINUX_BTF)   \
 		    BPFOBJ=$(BPFOBJ) BPF_INCLUDE=$(INCLUDE_DIR) &&	\
 		    cp $(SCRATCH_DIR)/runqslower $@
+
+TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL)
 
 $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(OUTPUT)/test_stub.o $(BPFOBJ)
 

tools/testing/selftests/bpf/test_bpftool.sh

···
 # SPDX-License-Identifier: GPL-2.0
 # Copyright (c) 2020 SUSE LLC.
 
+# 'make -C tools/testing/selftests/bpf install' will install to SCRIPT_DIR
 SCRIPT_DIR=$(dirname $(realpath $0))
 
 # 'make -C tools/testing/selftests/bpf' will install to BPFTOOL_INSTALL_PATH
 BPFTOOL_INSTALL_PATH="$SCRIPT_DIR"/tools/sbin
-export PATH=$BPFTOOL_INSTALL_PATH:$PATH
+export PATH=$SCRIPT_DIR:$BPFTOOL_INSTALL_PATH:$PATH
 python3 -m unittest -v test_bpftool.TestBpftool