Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / samples / bpf / bpf_helpers.h

diff --git a/kernel/samples/bpf/bpf_helpers.h b/kernel/samples/bpf/bpf_helpers.h
new file mode 100644 (file)
index 0000000..f960b5f
--- /dev/null
+++ b/kernel/samples/bpf/bpf_helpers.h
@@ -0,0 +1,53 @@
+#ifndef __BPF_HELPERS_H
+#define __BPF_HELPERS_H
+
+/* helper macro to place programs, maps, license in
+ * different sections in elf_bpf file. Section names
+ * are interpreted by elf_bpf loader
+ */
+#define SEC(NAME) __attribute__((section(NAME), used))
+
+/* helper functions called from eBPF programs written in C */
+static void *(*bpf_map_lookup_elem)(void *map, void *key) =
+       (void *) BPF_FUNC_map_lookup_elem;
+static int (*bpf_map_update_elem)(void *map, void *key, void *value,
+                                 unsigned long long flags) =
+       (void *) BPF_FUNC_map_update_elem;
+static int (*bpf_map_delete_elem)(void *map, void *key) =
+       (void *) BPF_FUNC_map_delete_elem;
+static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) =
+       (void *) BPF_FUNC_probe_read;
+static unsigned long long (*bpf_ktime_get_ns)(void) =
+       (void *) BPF_FUNC_ktime_get_ns;
+static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
+       (void *) BPF_FUNC_trace_printk;
+
+/* llvm builtin functions that eBPF C program may use to
+ * emit BPF_LD_ABS and BPF_LD_IND instructions
+ */
+struct sk_buff;
+unsigned long long load_byte(void *skb,
+                            unsigned long long off) asm("llvm.bpf.load.byte");
+unsigned long long load_half(void *skb,
+                            unsigned long long off) asm("llvm.bpf.load.half");
+unsigned long long load_word(void *skb,
+                            unsigned long long off) asm("llvm.bpf.load.word");
+
+/* a helper structure used by eBPF C program
+ * to describe map attributes to elf_bpf loader
+ */
+struct bpf_map_def {
+       unsigned int type;
+       unsigned int key_size;
+       unsigned int value_size;
+       unsigned int max_entries;
+};
+
+static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
+       (void *) BPF_FUNC_skb_store_bytes;
+static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
+       (void *) BPF_FUNC_l3_csum_replace;
+static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
+       (void *) BPF_FUNC_l4_csum_replace;
+
+#endif