Merge branch 'selftests-move-bpf-offload-test-from-bpf-to-net'

Jakub Kicinski says:

====================
selftests: move bpf-offload test from bpf to net

The test_offload.py test fits in networking and bpf equally
well. We started adding more Python tests in networking
and some of the code in test_offload.py can be reused,
so move it to networking. Looks like it bit rotted over
time and some fixes are needed.

Admittedly more code could be extracted but I only had
the time for a minor cleanup :(
====================

Link: https://lore.kernel.org/r/20240409031549.3531084-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/bpf/Makefile

@@ -102,7 +102,6 @@ TEST_PROGS := test_kmod.sh \
 	test_xdp_redirect_multi.sh \
 	test_xdp_meta.sh \
 	test_xdp_veth.sh \
-	test_offload.py \
 	test_sock_addr.sh \
 	test_tunnel.sh \
 	test_lwt_seg6local.sh \

tools/testing/selftests/net/Makefile

@@ -84,6 +84,8 @@ TEST_GEN_FILES += sctp_hello
 TEST_GEN_FILES += csum
 TEST_GEN_FILES += nat6to4.o
 TEST_GEN_FILES += xdp_dummy.o
+TEST_GEN_FILES += sample_ret0.bpf.o
+TEST_GEN_FILES += sample_map_ret0.bpf.o
 TEST_GEN_FILES += ip_local_port_range
 TEST_GEN_FILES += bind_wildcard
 TEST_PROGS += test_vxlan_mdb.sh
@@ -93,6 +95,7 @@ TEST_PROGS += test_bridge_backup_port.sh
 TEST_PROGS += fdb_flush.sh
 TEST_PROGS += fq_band_pktlimit.sh
 TEST_PROGS += vlan_hw_filter.sh
+TEST_PROGS += bpf_offload.py
 
 TEST_FILES := settings
 TEST_FILES += in_netns.sh lib.sh net_helper.sh setup_loopback.sh setup_veth.sh
@@ -142,8 +145,12 @@ endif
 
 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG),$(CLANG_TARGET_ARCH))
 
-$(OUTPUT)/nat6to4.o $(OUTPUT)/xdp_dummy.o: $(OUTPUT)/%.o : %.c $(BPFOBJ) | $(MAKE_DIRS)
-	$(CLANG) -O2 --target=bpf -c $< $(CCINCLUDE) $(CLANG_SYS_INCLUDES) -o $@
+BPF_PROG_OBJS := $(OUTPUT)/nat6to4.o $(OUTPUT)/xdp_dummy.o \
+	$(OUTPUT)/sample_map_ret0.bpf.o $(OUTPUT)/sample_ret0.bpf.o
+
+$(BPF_PROG_OBJS): $(OUTPUT)/%.o : %.c $(BPFOBJ) | $(MAKE_DIRS)
+	$(CLANG) -O2 -g --target=bpf $(CCINCLUDE) $(CLANG_SYS_INCLUDES) \
+	-c $< -o $@
 
 $(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile)		       \
 	   $(APIDIR)/linux/bpf.h					       \

tools/testing/selftests/net/lib/py/nsim.py

@@ -21,8 +21,11 @@ class NetdevSim:
         if match and int(match.groups()[0]) != port_index + 1:
             raise Exception("netdevice name mismatches the expected one")
 
+        self.ifname = ifname
         self.nsimdev = nsimdev
         self.port_index = port_index
+        self.ns = ns
+        self.dfs_dir = "%s/ports/%u/" % (nsimdev.dfs_dir, port_index)
         ret = ip("-j link show dev %s" % ifname, ns=ns)
         self.dev = json.loads(ret.stdout)[0]
 
@@ -79,8 +82,10 @@ class NetdevSimDev:
 
         self.nsims = []
         for port_index in range(port_count):
-            self.nsims.append(NetdevSim(self, port_index, ifnames[port_index],
-                                        ns=ns))
+            self.nsims.append(self._make_port(port_index, ifnames[port_index]))
+
+    def _make_port(self, port_index, ifname):
+        return NetdevSim(self, port_index, ifname, self.ns)
 
     def get_ifnames(self):
         ifnames = []

tools/testing/selftests/bpf/progs/sample_map_ret0.c → tools/testing/selftests/net/sample_map_ret0.bpf.c

@@ -17,7 +17,7 @@ struct {
 } array SEC(".maps");
 
 /* Sample program which should always load for testing control paths. */
-SEC(".text") int func()
+SEC("xdp") int func()
 {
 	__u64 key64 = 0;
 	__u32 key = 0;

tools/testing/selftests/bpf/progs/sample_ret0.c → tools/testing/selftests/net/sample_ret0.bpf.c

 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
 
+#define SEC(name) __attribute__((section(name), used))
+
 /* Sample program which should always load for testing control paths. */
+SEC("xdp")
 int func()
 {
 	return 0;