[PATCH net-next v3] selftests/xsk: decouple xskxceiver and xdp apps from test_progs objects

[Tushar Vyavahare <tushar.vyavahare@intel.com>]

Build xskxceiver, xdp_hw_metadata, and xdp_features from explicit source
lists instead of reusing helper objects produced by test_progs rules.

Reusing shared objects such as network_helpers.o and xsk.o can pull in
test_progs-only dependency chains and trigger unrelated libarena builds
when invoking a single target.

Keep these standalone binaries self-contained so each target builds only
its own required sources and BPF skeleton dependencies.

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com>
---
v3:
- Fix SoB line
- Add tags from Maciej

v2:
- Inline dependency lists in tools/testing/selftests/bpf/Makefile.
- Drop *_SRC helper variables per review feedback.
---
 tools/testing/selftests/bpf/Makefile | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index b642ee489ea6..f4e78bf8ec80 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -934,17 +934,26 @@ $(OUTPUT)/test_verifier: test_verifier.c verifier/tests.h $(BPFOBJ) | $(OUTPUT)
 	$(call msg,BINARY,,$@)
 	$(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
 
-# Include find_bit.c to compile xskxceiver.
-EXTRA_SRC := $(TOOLSDIR)/lib/find_bit.c prog_tests/test_xsk.c prog_tests/test_xsk.h
-$(OUTPUT)/xskxceiver: $(EXTRA_SRC) xskxceiver.c xskxceiver.h $(OUTPUT)/network_helpers.o $(OUTPUT)/xsk.o $(OUTPUT)/xsk_xdp_progs.skel.h $(BPFOBJ) | $(OUTPUT)
+# Keep xskxceiver independent from test_progs object dependencies.
+$(OUTPUT)/xskxceiver: xskxceiver.c xsk.c network_helpers.c \
+			   $(TOOLSDIR)/lib/find_bit.c prog_tests/test_xsk.c \
+			   xskxceiver.h xsk.h network_helpers.h \
+			   prog_tests/test_xsk.h test_progs.h bpf_util.h \
+			   $(OUTPUT)/xsk_xdp_progs.skel.h $(BPFOBJ) | $(OUTPUT)
 	$(call msg,BINARY,,$@)
 	$(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
 
-$(OUTPUT)/xdp_hw_metadata: xdp_hw_metadata.c $(OUTPUT)/network_helpers.o $(OUTPUT)/xsk.o $(OUTPUT)/xdp_hw_metadata.skel.h | $(OUTPUT)
+$(OUTPUT)/xdp_hw_metadata: xdp_hw_metadata.c xsk.c network_helpers.c \
+			   $(TOOLSDIR)/lib/find_bit.c xdp_metadata.h \
+			   xsk.h network_helpers.h test_progs.h bpf_util.h \
+			   $(OUTPUT)/xdp_hw_metadata.skel.h $(BPFOBJ) | $(OUTPUT)
 	$(call msg,BINARY,,$@)
 	$(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
 
-$(OUTPUT)/xdp_features: xdp_features.c $(OUTPUT)/network_helpers.o $(OUTPUT)/xdp_features.skel.h | $(OUTPUT)
+$(OUTPUT)/xdp_features: xdp_features.c network_helpers.c xdp_features.h \
+			   network_helpers.h \
+			   test_progs.h bpf_util.h $(OUTPUT)/xdp_features.skel.h \
+			   $(BPFOBJ) | $(OUTPUT)
 	$(call msg,BINARY,,$@)
 	$(Q)$(CC) $(CFLAGS) $(filter %.a %.o %.c,$^) $(LDLIBS) -o $@
 
-- 
2.43.0