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/*
* Copyright (C) 2016-2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __NFP_BPF_H__
#define __NFP_BPF_H__ 1
#include <linux/bitfield.h>
#include <linux/bpf.h>
#include <linux/bpf_verifier.h>
#include <linux/list.h>
#include <linux/types.h>
#include "../nfp_asm.h"
/* For branch fixup logic use up-most byte of branch instruction as scratch
* area. Remember to clear this before sending instructions to HW!
*/
#define OP_BR_SPECIAL 0xff00000000000000ULL
enum br_special {
OP_BR_NORMAL = 0,
OP_BR_GO_OUT,
OP_BR_GO_ABORT,
};
enum static_regs {
STATIC_REG_IMM = 21, /* Bank AB */
STATIC_REG_STACK = 22, /* Bank A */
STATIC_REG_PKT_LEN = 22, /* Bank B */
};
enum pkt_vec {
PKT_VEC_PKT_LEN = 0,
PKT_VEC_PKT_PTR = 2,
};
#define pv_len(np) reg_lm(1, PKT_VEC_PKT_LEN)
#define pv_ctm_ptr(np) reg_lm(1, PKT_VEC_PKT_PTR)
#define stack_reg(np) reg_a(STATIC_REG_STACK)
#define stack_imm(np) imm_b(np)
#define plen_reg(np) reg_b(STATIC_REG_PKT_LEN)
#define pptr_reg(np) pv_ctm_ptr(np)
#define imm_a(np) reg_a(STATIC_REG_IMM)
#define imm_b(np) reg_b(STATIC_REG_IMM)
#define imm_both(np) reg_both(STATIC_REG_IMM)
#define NFP_BPF_ABI_FLAGS reg_imm(0)
#define NFP_BPF_ABI_FLAG_MARK 1
struct nfp_prog;
struct nfp_insn_meta;
typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *);
#define nfp_prog_first_meta(nfp_prog) \
list_first_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
#define nfp_prog_last_meta(nfp_prog) \
list_last_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
#define nfp_meta_next(meta) list_next_entry(meta, l)
#define nfp_meta_prev(meta) list_prev_entry(meta, l)
#define FLAG_INSN_IS_JUMP_DST BIT(0)
/**
* struct nfp_insn_meta - BPF instruction wrapper
* @insn: BPF instruction
* @ptr: pointer type for memory operations
* @ldst_gather_len: memcpy length gathered from load/store sequence
* @paired_st: the paired store insn at the head of the sequence
* @ptr_not_const: pointer is not always constant
* @jmp_dst: destination info for jump instructions
* @off: index of first generated machine instruction (in nfp_prog.prog)
* @n: eBPF instruction number
* @flags: eBPF instruction extra optimization flags
* @skip: skip this instruction (optimized out)
* @double_cb: callback for second part of the instruction
* @l: link on nfp_prog->insns list
*/
struct nfp_insn_meta {
struct bpf_insn insn;
union {
struct {
struct bpf_reg_state ptr;
struct bpf_insn *paired_st;
s16 ldst_gather_len;
bool ptr_not_const;
};
struct nfp_insn_meta *jmp_dst;
};
unsigned int off;
unsigned short n;
unsigned short flags;
bool skip;
instr_cb_t double_cb;
struct list_head l;
};
#define BPF_SIZE_MASK 0x18
static inline u8 mbpf_class(const struct nfp_insn_meta *meta)
{
return BPF_CLASS(meta->insn.code);
}
static inline u8 mbpf_src(const struct nfp_insn_meta *meta)
{
return BPF_SRC(meta->insn.code);
}
static inline u8 mbpf_op(const struct nfp_insn_meta *meta)
{
return BPF_OP(meta->insn.code);
}
static inline u8 mbpf_mode(const struct nfp_insn_meta *meta)
{
return BPF_MODE(meta->insn.code);
}
static inline bool is_mbpf_load(const struct nfp_insn_meta *meta)
{
return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_LDX | BPF_MEM);
}
static inline bool is_mbpf_store(const struct nfp_insn_meta *meta)
{
return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_MEM);
}
/**
* struct nfp_prog - nfp BPF program
* @prog: machine code
* @prog_len: number of valid instructions in @prog array
* @__prog_alloc_len: alloc size of @prog array
* @verifier_meta: temporary storage for verifier's insn meta
* @type: BPF program type
* @start_off: address of the first instruction in the memory
* @last_bpf_off: address of the last instruction translated from BPF
* @tgt_out: jump target for normal exit
* @tgt_abort: jump target for abort (e.g. access outside of packet buffer)
* @tgt_done: jump target to get the next packet
* @n_translated: number of successfully translated instructions (for errors)
* @error: error code if something went wrong
* @stack_depth: max stack depth from the verifier
* @insns: list of BPF instruction wrappers (struct nfp_insn_meta)
*/
struct nfp_prog {
u64 *prog;
unsigned int prog_len;
unsigned int __prog_alloc_len;
struct nfp_insn_meta *verifier_meta;
enum bpf_prog_type type;
unsigned int start_off;
unsigned int last_bpf_off;
unsigned int tgt_out;
unsigned int tgt_abort;
unsigned int tgt_done;
unsigned int n_translated;
int error;
unsigned int stack_depth;
struct list_head insns;
};
int nfp_bpf_jit(struct nfp_prog *prog);
extern const struct bpf_ext_analyzer_ops nfp_bpf_analyzer_ops;
struct netdev_bpf;
struct nfp_app;
struct nfp_net;
int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog,
bool old_prog);
int nfp_bpf_verifier_prep(struct nfp_app *app, struct nfp_net *nn,
struct netdev_bpf *bpf);
int nfp_bpf_translate(struct nfp_app *app, struct nfp_net *nn,
struct bpf_prog *prog);
int nfp_bpf_destroy(struct nfp_app *app, struct nfp_net *nn,
struct bpf_prog *prog);
struct nfp_insn_meta *
nfp_bpf_goto_meta(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
unsigned int insn_idx, unsigned int n_insns);
#endif
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