1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/net/tap/tap_bpf.h b/drivers/net/tap/tap_bpf.h
new file mode 100644
index 00000000..1a70ffe2
--- /dev/null
+++ b/drivers/net/tap/tap_bpf.h
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+ * Copyright 2017 Mellanox Technologies, Ltd.
+ */
+
+#ifndef __TAP_BPF_H__
+#define __TAP_BPF_H__
+
+#include <tap_autoconf.h>
+
+/* Do not #include <linux/bpf.h> since eBPF must compile on different
+ * distros which may include partial definitions for eBPF (while the
+ * kernel itself may support eBPF). Instead define here all that is needed
+ */
+
+/* BPF_MAP_UPDATE_ELEM command flags */
+#define	BPF_ANY	0 /* create a new element or update an existing */
+
+/* BPF architecture instruction struct */
+struct bpf_insn {
+	__u8	code;
+	__u8	dst_reg:4;
+	__u8	src_reg:4;
+	__s16	off;
+	__s32	imm; /* immediate value */
+};
+
+/* BPF program types */
+enum bpf_prog_type {
+	BPF_PROG_TYPE_UNSPEC,
+	BPF_PROG_TYPE_SOCKET_FILTER,
+	BPF_PROG_TYPE_KPROBE,
+	BPF_PROG_TYPE_SCHED_CLS,
+	BPF_PROG_TYPE_SCHED_ACT,
+};
+
+/* BPF commands types */
+enum bpf_cmd {
+	BPF_MAP_CREATE,
+	BPF_MAP_LOOKUP_ELEM,
+	BPF_MAP_UPDATE_ELEM,
+	BPF_MAP_DELETE_ELEM,
+	BPF_MAP_GET_NEXT_KEY,
+	BPF_PROG_LOAD,
+};
+
+/* BPF maps types */
+enum bpf_map_type {
+	BPF_MAP_TYPE_UNSPEC,
+	BPF_MAP_TYPE_HASH,
+};
+
+/* union of anonymous structs used with TAP BPF commands */
+union bpf_attr {
+	/* BPF_MAP_CREATE command */
+	struct {
+		__u32	map_type;
+		__u32	key_size;
+		__u32	value_size;
+		__u32	max_entries;
+		__u32	map_flags;
+		__u32	inner_map_fd;
+	};
+
+	/* BPF_MAP_UPDATE_ELEM, BPF_MAP_DELETE_ELEM commands */
+	struct {
+		__u32		map_fd;
+		__aligned_u64	key;
+		union {
+			__aligned_u64 value;
+			__aligned_u64 next_key;
+		};
+		__u64		flags;
+	};
+
+	/* BPF_PROG_LOAD command */
+	struct {
+		__u32		prog_type;
+		__u32		insn_cnt;
+		__aligned_u64	insns;
+		__aligned_u64	license;
+		__u32		log_level;
+		__u32		log_size;
+		__aligned_u64	log_buf;
+		__u32		kern_version;
+		__u32		prog_flags;
+	};
+} __attribute__((aligned(8)));
+
+#ifndef __NR_bpf
+# if defined(__i386__)
+#  define __NR_bpf 357
+# elif defined(__x86_64__)
+#  define __NR_bpf 321
+# elif defined(__arm__)
+#  define __NR_bpf 386
+# elif defined(__aarch64__)
+#  define __NR_bpf 280
+# elif defined(__sparc__)
+#  define __NR_bpf 349
+# elif defined(__s390__)
+#  define __NR_bpf 351
+# elif defined(__powerpc__)
+#  define __NR_bpf 361
+# else
+#  error __NR_bpf not defined
+# endif
+#endif
+
+enum {
+	BPF_MAP_ID_KEY,
+	BPF_MAP_ID_SIMPLE,
+};
+
+static int bpf_load(enum bpf_prog_type type, const struct bpf_insn *insns,
+		size_t insns_cnt, const char *license);
+
+#endif /* __TAP_BPF_H__ */