diff options
Diffstat (limited to 'lib/librte_bpf/bpf_def.h')
| -rw-r--r-- | lib/librte_bpf/bpf_def.h | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/lib/librte_bpf/bpf_def.h b/lib/librte_bpf/bpf_def.h new file mode 100644 index 00000000..c10f3aec --- /dev/null +++ b/lib/librte_bpf/bpf_def.h @@ -0,0 +1,143 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * Copyright(c) 1982, 1986, 1990, 1993 + * The Regents of the University of California. + * Copyright(c) 2018 Intel Corporation. + */ + +#ifndef _RTE_BPF_DEF_H_ +#define _RTE_BPF_DEF_H_ + +/** + * @file + * + * classic BPF (cBPF) and extended BPF (eBPF) related defines. + * For more information regarding cBPF and eBPF ISA and their differences, + * please refer to: + * https://www.kernel.org/doc/Documentation/networking/filter.txt. + * As a rule of thumb for that file: + * all definitions used by both cBPF and eBPF start with bpf(BPF)_ prefix, + * while eBPF only ones start with ebpf(EBPF)) prefix. + */ + +#include <stdint.h> + + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * The instruction encodings. + */ + +/* Instruction classes */ +#define BPF_CLASS(code) ((code) & 0x07) +#define BPF_LD 0x00 +#define BPF_LDX 0x01 +#define BPF_ST 0x02 +#define BPF_STX 0x03 +#define BPF_ALU 0x04 +#define BPF_JMP 0x05 +#define BPF_RET 0x06 +#define BPF_MISC 0x07 + +#define EBPF_ALU64 0x07 + +/* ld/ldx fields */ +#define BPF_SIZE(code) ((code) & 0x18) +#define BPF_W 0x00 +#define BPF_H 0x08 +#define BPF_B 0x10 +#define EBPF_DW 0x18 + +#define BPF_MODE(code) ((code) & 0xe0) +#define BPF_IMM 0x00 +#define BPF_ABS 0x20 +#define BPF_IND 0x40 +#define BPF_MEM 0x60 +#define BPF_LEN 0x80 +#define BPF_MSH 0xa0 + +#define EBPF_XADD 0xc0 + +/* alu/jmp fields */ +#define BPF_OP(code) ((code) & 0xf0) +#define BPF_ADD 0x00 +#define BPF_SUB 0x10 +#define BPF_MUL 0x20 +#define BPF_DIV 0x30 +#define BPF_OR 0x40 +#define BPF_AND 0x50 +#define BPF_LSH 0x60 +#define BPF_RSH 0x70 +#define BPF_NEG 0x80 +#define BPF_MOD 0x90 +#define BPF_XOR 0xa0 + +#define EBPF_MOV 0xb0 +#define EBPF_ARSH 0xc0 +#define EBPF_END 0xd0 + +#define BPF_JA 0x00 +#define BPF_JEQ 0x10 +#define BPF_JGT 0x20 +#define BPF_JGE 0x30 +#define BPF_JSET 0x40 + +#define EBPF_JNE 0x50 +#define EBPF_JSGT 0x60 +#define EBPF_JSGE 0x70 +#define EBPF_CALL 0x80 +#define EBPF_EXIT 0x90 +#define EBPF_JLT 0xa0 +#define EBPF_JLE 0xb0 +#define EBPF_JSLT 0xc0 +#define EBPF_JSLE 0xd0 + +#define BPF_SRC(code) ((code) & 0x08) +#define BPF_K 0x00 +#define BPF_X 0x08 + +/* if BPF_OP(code) == EBPF_END */ +#define EBPF_TO_LE 0x00 /* convert to little-endian */ +#define EBPF_TO_BE 0x08 /* convert to big-endian */ + +/* + * eBPF registers + */ +enum { + EBPF_REG_0, /* return value from internal function/for eBPF program */ + EBPF_REG_1, /* 0-th argument to internal function */ + EBPF_REG_2, /* 1-th argument to internal function */ + EBPF_REG_3, /* 2-th argument to internal function */ + EBPF_REG_4, /* 3-th argument to internal function */ + EBPF_REG_5, /* 4-th argument to internal function */ + EBPF_REG_6, /* callee saved register */ + EBPF_REG_7, /* callee saved register */ + EBPF_REG_8, /* callee saved register */ + EBPF_REG_9, /* callee saved register */ + EBPF_REG_10, /* stack pointer (read-only) */ + EBPF_REG_NUM, +}; + +/* + * eBPF instruction format + */ +struct ebpf_insn { + uint8_t code; + uint8_t dst_reg:4; + uint8_t src_reg:4; + int16_t off; + int32_t imm; +}; + +/* + * eBPF allows functions with R1-R5 as arguments. + */ +#define EBPF_FUNC_MAX_ARGS (EBPF_REG_6 - EBPF_REG_1) + +#ifdef __cplusplus +} +#endif + +#endif /* RTE_BPF_DEF_H_ */ |