7a33572057
The private headers are compiled internally with a C compiler. Thus extern "C" declaration is useless in such files. Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 1982, 1986, 1990, 1993
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* The Regents of the University of California.
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* Copyright(c) 2018 Intel Corporation.
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*/
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#ifndef _RTE_BPF_DEF_H_
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#define _RTE_BPF_DEF_H_
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/**
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* @file
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*
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* classic BPF (cBPF) and extended BPF (eBPF) related defines.
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* For more information regarding cBPF and eBPF ISA and their differences,
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* please refer to:
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* https://www.kernel.org/doc/Documentation/networking/filter.txt.
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* As a rule of thumb for that file:
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* all definitions used by both cBPF and eBPF start with bpf(BPF)_ prefix,
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* while eBPF only ones start with ebpf(EBPF)) prefix.
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*/
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#include <stdint.h>
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/*
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* The instruction encodings.
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*/
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/* Instruction classes */
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#define BPF_CLASS(code) ((code) & 0x07)
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#define BPF_LD 0x00
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#define BPF_LDX 0x01
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#define BPF_ST 0x02
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#define BPF_STX 0x03
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#define BPF_ALU 0x04
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#define BPF_JMP 0x05
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#define BPF_RET 0x06
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#define BPF_MISC 0x07
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#define EBPF_ALU64 0x07
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/* ld/ldx fields */
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#define BPF_SIZE(code) ((code) & 0x18)
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#define BPF_W 0x00
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#define BPF_H 0x08
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#define BPF_B 0x10
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#define EBPF_DW 0x18
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#define BPF_MODE(code) ((code) & 0xe0)
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#define BPF_IMM 0x00
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#define BPF_ABS 0x20
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#define BPF_IND 0x40
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#define BPF_MEM 0x60
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#define BPF_LEN 0x80
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#define BPF_MSH 0xa0
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#define EBPF_XADD 0xc0
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/* alu/jmp fields */
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#define BPF_OP(code) ((code) & 0xf0)
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#define BPF_ADD 0x00
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#define BPF_SUB 0x10
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#define BPF_MUL 0x20
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#define BPF_DIV 0x30
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#define BPF_OR 0x40
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#define BPF_AND 0x50
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#define BPF_LSH 0x60
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#define BPF_RSH 0x70
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#define BPF_NEG 0x80
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#define BPF_MOD 0x90
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#define BPF_XOR 0xa0
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#define EBPF_MOV 0xb0
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#define EBPF_ARSH 0xc0
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#define EBPF_END 0xd0
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#define BPF_JA 0x00
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#define BPF_JEQ 0x10
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#define BPF_JGT 0x20
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#define BPF_JGE 0x30
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#define BPF_JSET 0x40
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#define EBPF_JNE 0x50
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#define EBPF_JSGT 0x60
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#define EBPF_JSGE 0x70
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#define EBPF_CALL 0x80
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#define EBPF_EXIT 0x90
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#define EBPF_JLT 0xa0
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#define EBPF_JLE 0xb0
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#define EBPF_JSLT 0xc0
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#define EBPF_JSLE 0xd0
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#define BPF_SRC(code) ((code) & 0x08)
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#define BPF_K 0x00
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#define BPF_X 0x08
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/* if BPF_OP(code) == EBPF_END */
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#define EBPF_TO_LE 0x00 /* convert to little-endian */
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#define EBPF_TO_BE 0x08 /* convert to big-endian */
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/*
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* eBPF registers
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*/
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enum {
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EBPF_REG_0, /* return value from internal function/for eBPF program */
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EBPF_REG_1, /* 0-th argument to internal function */
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EBPF_REG_2, /* 1-th argument to internal function */
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EBPF_REG_3, /* 2-th argument to internal function */
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EBPF_REG_4, /* 3-th argument to internal function */
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EBPF_REG_5, /* 4-th argument to internal function */
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EBPF_REG_6, /* callee saved register */
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EBPF_REG_7, /* callee saved register */
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EBPF_REG_8, /* callee saved register */
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EBPF_REG_9, /* callee saved register */
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EBPF_REG_10, /* stack pointer (read-only) */
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EBPF_REG_NUM,
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};
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/*
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* When EBPF_CALL instruction has src_reg == EBPF_PSEUDO_CALL,
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* it should be treated as pseudo-call instruction, where
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* imm value contains pc-relative offset to another EBPF function.
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* Right now DPDK EBPF library doesn't support it.
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*/
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#define EBPF_PSEUDO_CALL EBPF_REG_1
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/*
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* eBPF instruction format
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*/
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struct ebpf_insn {
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uint8_t code;
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uint8_t dst_reg:4;
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uint8_t src_reg:4;
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int16_t off;
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int32_t imm;
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};
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/*
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* eBPF allows functions with R1-R5 as arguments.
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*/
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#define EBPF_FUNC_MAX_ARGS (EBPF_REG_6 - EBPF_REG_1)
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#endif /* RTE_BPF_DEF_H_ */
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