summaryrefslogtreecommitdiffstats
path: root/drivers/net/tap/tap_bpf.h
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/tap/tap_bpf.h')
-rw-r--r--drivers/net/tap/tap_bpf.h117
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__ */