[PATCH net] selftests/net: mv bpf/nat6to4.c to net folder

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There are some issues with the bpf/nat6to4.c building.

1. It use TEST_CUSTOM_PROGS, which will add the nat6to4.o to
   kselftest-list file and run by common run_tests.
2. When building the test via `make -C tools/testing/selftests/
   TARGETS="net"`, the nat6to4.o will be build in selftests/net/bpf/
   folder. But in test udpgro_frglist.sh it refers to ../bpf/nat6to4.o.
   The correct path should be ./bpf/nat6to4.o.
3. If building the test via `make -C tools/testing/selftests/ TARGETS="net"
   install`. The nat6to4.o will be installed to kselftest_install/net/
   folder. Then the udpgro_frglist.sh should refer to ./nat6to4.o.

To fix the confusing test path, let's just move the nat6to4.c to net folder
and build it as TEST_GEN_FILES.

Fixes: edae34a3ed92 ("selftests net: add UDP GRO fraglist + bpf self-tests")
Signed-off-by: Hangbin Liu <liuhangbin@xxxxxxxxx>
---
 tools/testing/selftests/net/Makefile            | 11 +++++++++--
 tools/testing/selftests/net/bpf/Makefile        | 14 --------------
 tools/testing/selftests/net/{bpf => }/nat6to4.c |  0
 tools/testing/selftests/net/udpgro_frglist.sh   |  6 +++---
 4 files changed, 12 insertions(+), 19 deletions(-)
 delete mode 100644 tools/testing/selftests/net/bpf/Makefile
 rename tools/testing/selftests/net/{bpf => }/nat6to4.c (100%)

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index 69c58362c0ed..d1495107a320 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -71,14 +71,21 @@ TEST_GEN_FILES += bind_bhash
 TEST_GEN_PROGS += sk_bind_sendto_listen
 TEST_GEN_PROGS += sk_connect_zero_addr
 TEST_PROGS += test_ingress_egress_chaining.sh
+TEST_GEN_FILES += nat6to4.o
 
 TEST_FILES := settings
 
 include ../lib.mk
 
-include bpf/Makefile
-
 $(OUTPUT)/reuseport_bpf_numa: LDLIBS += -lnuma
 $(OUTPUT)/tcp_mmap: LDLIBS += -lpthread
 $(OUTPUT)/tcp_inq: LDLIBS += -lpthread
 $(OUTPUT)/bind_bhash: LDLIBS += -lpthread
+
+CLANG ?= clang
+CCINCLUDE += -I../bpf
+CCINCLUDE += -I../../../lib
+CCINCLUDE += -I../../../../usr/include/
+
+$(OUTPUT)/nat6to4.o: nat6to4.c
+	$(CLANG) -O2 -target bpf -c $< $(CCINCLUDE) -o $@
diff --git a/tools/testing/selftests/net/bpf/Makefile b/tools/testing/selftests/net/bpf/Makefile
deleted file mode 100644
index 8ccaf8732eb2..000000000000
--- a/tools/testing/selftests/net/bpf/Makefile
+++ /dev/null
@@ -1,14 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-
-CLANG ?= clang
-CCINCLUDE += -I../../bpf
-CCINCLUDE += -I../../../../lib
-CCINCLUDE += -I../../../../../usr/include/
-
-TEST_CUSTOM_PROGS = $(OUTPUT)/bpf/nat6to4.o
-all: $(TEST_CUSTOM_PROGS)
-
-$(OUTPUT)/%.o: %.c
-	$(CLANG) -O2 -target bpf -c $< $(CCINCLUDE) -o $@
-
-EXTRA_CLEAN := $(TEST_CUSTOM_PROGS)
diff --git a/tools/testing/selftests/net/bpf/nat6to4.c b/tools/testing/selftests/net/nat6to4.c
similarity index 100%
rename from tools/testing/selftests/net/bpf/nat6to4.c
rename to tools/testing/selftests/net/nat6to4.c
diff --git a/tools/testing/selftests/net/udpgro_frglist.sh b/tools/testing/selftests/net/udpgro_frglist.sh
index c9c4b9d65839..4f58444c90a1 100755
--- a/tools/testing/selftests/net/udpgro_frglist.sh
+++ b/tools/testing/selftests/net/udpgro_frglist.sh
@@ -40,8 +40,8 @@ run_one() {
 
 	ip -n "${PEER_NS}" link set veth1 xdp object ${BPF_FILE} section xdp
 	tc -n "${PEER_NS}" qdisc add dev veth1 clsact
-	tc -n "${PEER_NS}" filter add dev veth1 ingress prio 4 protocol ipv6 bpf object-file ../bpf/nat6to4.o section schedcls/ingress6/nat_6  direct-action
-	tc -n "${PEER_NS}" filter add dev veth1 egress prio 4 protocol ip bpf object-file ../bpf/nat6to4.o section schedcls/egress4/snat4 direct-action
+	tc -n "${PEER_NS}" filter add dev veth1 ingress prio 4 protocol ipv6 bpf object-file nat6to4.o section schedcls/ingress6/nat_6  direct-action
+	tc -n "${PEER_NS}" filter add dev veth1 egress prio 4 protocol ip bpf object-file nat6to4.o section schedcls/egress4/snat4 direct-action
         echo ${rx_args}
 	ip netns exec "${PEER_NS}" ./udpgso_bench_rx ${rx_args} -r &
 
@@ -88,7 +88,7 @@ if [ ! -f ${BPF_FILE} ]; then
 	exit -1
 fi
 
-if [ ! -f bpf/nat6to4.o ]; then
+if [ ! -f nat6to4.o ]; then
 	echo "Missing nat6to4 helper. Build bpfnat6to4.o selftest first"
 	exit -1
 fi
-- 
2.38.1




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