New upstream version 18.02

[deb_dpdk.git] / drivers / net / tap / tap_bpf.h

diff --git a/drivers/net/tap/tap_bpf.h b/drivers/net/tap/tap_bpf.h
new file mode 100644 (file)
index 0000000..1a70ffe
--- /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__ */