203 lines
6.0 KiB
C
203 lines
6.0 KiB
C
/*
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* Copyright (C) 2016 Netronome Systems, Inc.
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*
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* This software is dual licensed under the GNU General License Version 2,
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* June 1991 as shown in the file COPYING in the top-level directory of this
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* source tree or the BSD 2-Clause License provided below. You have the
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* option to license this software under the complete terms of either license.
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*
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* The BSD 2-Clause License:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef __NFP_BPF_H__
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#define __NFP_BPF_H__ 1
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#include <linux/bitfield.h>
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#include <linux/bpf.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#define FIELD_FIT(mask, val) (!((((u64)val) << __bf_shf(mask)) & ~(mask)))
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/* For branch fixup logic use up-most byte of branch instruction as scratch
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* area. Remember to clear this before sending instructions to HW!
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*/
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#define OP_BR_SPECIAL 0xff00000000000000ULL
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enum br_special {
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OP_BR_NORMAL = 0,
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OP_BR_GO_OUT,
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OP_BR_GO_ABORT,
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};
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enum static_regs {
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STATIC_REG_PKT = 1,
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#define REG_PKT_BANK ALU_DST_A
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STATIC_REG_IMM = 2, /* Bank AB */
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};
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enum nfp_bpf_action_type {
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NN_ACT_TC_DROP,
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NN_ACT_TC_REDIR,
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NN_ACT_DIRECT,
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};
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/* Software register representation, hardware encoding in asm.h */
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#define NN_REG_TYPE GENMASK(31, 24)
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#define NN_REG_VAL GENMASK(7, 0)
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enum nfp_bpf_reg_type {
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NN_REG_GPR_A = BIT(0),
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NN_REG_GPR_B = BIT(1),
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NN_REG_NNR = BIT(2),
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NN_REG_XFER = BIT(3),
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NN_REG_IMM = BIT(4),
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NN_REG_NONE = BIT(5),
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};
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#define NN_REG_GPR_BOTH (NN_REG_GPR_A | NN_REG_GPR_B)
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#define reg_both(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_GPR_BOTH))
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#define reg_a(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_GPR_A))
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#define reg_b(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_GPR_B))
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#define reg_nnr(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_NNR))
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#define reg_xfer(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_XFER))
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#define reg_imm(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_IMM))
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#define reg_none() (FIELD_PREP(NN_REG_TYPE, NN_REG_NONE))
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#define pkt_reg(np) reg_a((np)->regs_per_thread - STATIC_REG_PKT)
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#define imm_a(np) reg_a((np)->regs_per_thread - STATIC_REG_IMM)
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#define imm_b(np) reg_b((np)->regs_per_thread - STATIC_REG_IMM)
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#define imm_both(np) reg_both((np)->regs_per_thread - STATIC_REG_IMM)
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#define NFP_BPF_ABI_FLAGS reg_nnr(0)
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#define NFP_BPF_ABI_FLAG_MARK 1
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#define NFP_BPF_ABI_MARK reg_nnr(1)
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#define NFP_BPF_ABI_PKT reg_nnr(2)
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#define NFP_BPF_ABI_LEN reg_nnr(3)
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struct nfp_prog;
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struct nfp_insn_meta;
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typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *);
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#define nfp_prog_first_meta(nfp_prog) \
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list_first_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
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#define nfp_prog_last_meta(nfp_prog) \
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list_last_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
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#define nfp_meta_next(meta) list_next_entry(meta, l)
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#define nfp_meta_prev(meta) list_prev_entry(meta, l)
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/**
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* struct nfp_insn_meta - BPF instruction wrapper
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* @insn: BPF instruction
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* @off: index of first generated machine instruction (in nfp_prog.prog)
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* @n: eBPF instruction number
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* @skip: skip this instruction (optimized out)
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* @double_cb: callback for second part of the instruction
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* @l: link on nfp_prog->insns list
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*/
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struct nfp_insn_meta {
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struct bpf_insn insn;
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unsigned int off;
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unsigned short n;
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bool skip;
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instr_cb_t double_cb;
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struct list_head l;
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};
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#define BPF_SIZE_MASK 0x18
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static inline u8 mbpf_class(const struct nfp_insn_meta *meta)
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{
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return BPF_CLASS(meta->insn.code);
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}
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static inline u8 mbpf_src(const struct nfp_insn_meta *meta)
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{
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return BPF_SRC(meta->insn.code);
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}
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static inline u8 mbpf_op(const struct nfp_insn_meta *meta)
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{
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return BPF_OP(meta->insn.code);
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}
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static inline u8 mbpf_mode(const struct nfp_insn_meta *meta)
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{
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return BPF_MODE(meta->insn.code);
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}
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/**
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* struct nfp_prog - nfp BPF program
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* @prog: machine code
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* @prog_len: number of valid instructions in @prog array
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* @__prog_alloc_len: alloc size of @prog array
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* @act: BPF program/action type (TC DA, TC with action, XDP etc.)
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* @num_regs: number of registers used by this program
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* @regs_per_thread: number of basic registers allocated per thread
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* @start_off: address of the first instruction in the memory
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* @tgt_out: jump target for normal exit
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* @tgt_abort: jump target for abort (e.g. access outside of packet buffer)
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* @tgt_done: jump target to get the next packet
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* @n_translated: number of successfully translated instructions (for errors)
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* @error: error code if something went wrong
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* @insns: list of BPF instruction wrappers (struct nfp_insn_meta)
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*/
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struct nfp_prog {
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u64 *prog;
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unsigned int prog_len;
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unsigned int __prog_alloc_len;
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enum nfp_bpf_action_type act;
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unsigned int num_regs;
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unsigned int regs_per_thread;
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unsigned int start_off;
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unsigned int tgt_out;
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unsigned int tgt_abort;
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unsigned int tgt_done;
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unsigned int n_translated;
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int error;
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struct list_head insns;
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};
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struct nfp_bpf_result {
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unsigned int n_instr;
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bool dense_mode;
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};
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int
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nfp_bpf_jit(struct bpf_prog *filter, void *prog, enum nfp_bpf_action_type act,
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unsigned int prog_start, unsigned int prog_done,
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unsigned int prog_sz, struct nfp_bpf_result *res);
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int nfp_prog_verify(struct nfp_prog *nfp_prog, struct bpf_prog *prog);
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#endif
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