xdp: T2666: switch to example code provided by xdp-tutorial

1 files changed, 61 insertions, 0 deletions

diff --git a/src/xdp/include/bpf_util.h b/src/xdp/include/bpf_util.h
new file mode 100644
index 000000000..e74b33e9d
--- /dev/null
+++ b/src/xdp/include/bpf_util.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copied from $(LINUX)/tools/testing/selftests/bpf/bpf_util.h */
+#ifndef __BPF_UTIL__
+#define __BPF_UTIL__
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+static inline unsigned int bpf_num_possible_cpus(void)
+{
+	static const char *fcpu = "/sys/devices/system/cpu/possible";
+	unsigned int start, end, possible_cpus = 0;
+	char buff[128];
+	FILE *fp;
+	int n;
+
+	fp = fopen(fcpu, "r");
+	if (!fp) {
+		printf("Failed to open %s: '%s'!\n", fcpu, strerror(errno));
+		exit(1);
+	}
+
+	while (fgets(buff, sizeof(buff), fp)) {
+		n = sscanf(buff, "%u-%u", &start, &end);
+		if (n == 0) {
+			printf("Failed to retrieve # possible CPUs!\n");
+			exit(1);
+		} else if (n == 1) {
+			end = start;
+		}
+		possible_cpus = start == 0 ? end + 1 : 0;
+		break;
+	}
+	fclose(fp);
+
+	return possible_cpus;
+}
+
+#define __bpf_percpu_val_align	__attribute__((__aligned__(8)))
+
+#define BPF_DECLARE_PERCPU(type, name)				\
+	struct { type v; /* padding */ } __bpf_percpu_val_align	\
+		name[bpf_num_possible_cpus()]
+#define bpf_percpu(name, cpu) name[(cpu)].v
+
+#ifndef ARRAY_SIZE
+# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+#endif
+
+#ifndef sizeof_field
+#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
+#endif
+
+#ifndef offsetofend
+#define offsetofend(TYPE, MEMBER) \
+	(offsetof(TYPE, MEMBER)	+ sizeof_field(TYPE, MEMBER))
+#endif
+
+#endif /* __BPF_UTIL__ */