move around examples

tests/c-form/xdp_modify.bpf.c

@@ -0,0 +1,21 @@
+// xdp_rewrite.c
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <linux/if_ether.h>
+
+SEC("xdp")
+int xdp_rewrite_mac(struct xdp_md *ctx)
+{
+    void *data_end = (void *)(long)ctx->data_end;
+    void *data     = (void *)(long)ctx->data;
+
+    struct ethhdr *eth = data;
+    if ((void*)(eth + 1) > data_end)
+        return XDP_PASS;
+    __u8 new_src[ETH_ALEN] = {0x02,0x00,0x00,0x00,0x00,0x02};
+    for (int i = 0; i < ETH_ALEN; i++) eth->h_source[i] = new_src[i];
+
+    return XDP_PASS;
+}
+
+char _license[] SEC("license") = "GPL";

tests/failing_tests/vmlinux/Makefile

@@ -1,19 +0,0 @@
-BPF_CLANG := clang
-CFLAGS := -O2 -emit-llvm -target bpf -c
-
-SRC := $(wildcard *.bpf.c)
-LL := $(SRC:.bpf.c=.bpf.ll)
-OBJ := $(SRC:.bpf.c=.bpf.o)
-
-.PHONY: all clean
-
-all: $(LL) $(OBJ)
-
-%.bpf.o: %.bpf.c
-	$(BPF_CLANG) -O2 -g -target bpf -c $< -o $@
-
-%.bpf.ll: %.bpf.c
-	$(BPF_CLANG) $(CFLAGS) -g -S $< -o $@
-
-clean:
-	rm -f $(LL) $(OBJ)