1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
* Copyright (C) 2016 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/list.h>
#include <linux/types.h>
#define FIELD_FIT(mask, val) (!((((u64)val) << __bf_shf(mask)) & ~(mask)))
/* 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_PKT = 1,
#define REG_PKT_BANK ALU_DST_A
STATIC_REG_IMM = 2, /* Bank AB */
};
enum nfp_bpf_action_type {
NN_ACT_TC_DROP,
NN_ACT_TC_REDIR,
NN_ACT_DIRECT,
};
/* Software register representation, hardware encoding in asm.h */
#define NN_REG_TYPE GENMASK(31, 24)
#define NN_REG_VAL GENMASK(7, 0)
enum nfp_bpf_reg_type {
NN_REG_GPR_A = BIT(0),
NN_REG_GPR_B = BIT(1),
NN_REG_NNR = BIT(2),
NN_REG_XFER = BIT(3),
NN_REG_IMM = BIT(4),
NN_REG_NONE = BIT(5),
};
#define NN_REG_GPR_BOTH (NN_REG_GPR_A | NN_REG_GPR_B)
#define reg_both(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_GPR_BOTH))
#define reg_a(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_GPR_A))
#define reg_b(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_GPR_B))
#define reg_nnr(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_NNR))
#define reg_xfer(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_XFER))
#define reg_imm(x) ((x) | FIELD_PREP(NN_REG_TYPE, NN_REG_IMM))
#define reg_none() (FIELD_PREP(NN_REG_TYPE, NN_REG_NONE))
#define pkt_reg(np) reg_a((np)->regs_per_thread - STATIC_REG_PKT)
#define imm_a(np) reg_a((np)->regs_per_thread - STATIC_REG_IMM)
#define imm_b(np) reg_b((np)->regs_per_thread - STATIC_REG_IMM)
#define imm_both(np) reg_both((np)->regs_per_thread - STATIC_REG_IMM)
#define NFP_BPF_ABI_FLAGS reg_nnr(0)
#define NFP_BPF_ABI_FLAG_MARK 1
#define NFP_BPF_ABI_MARK reg_nnr(1)
#define NFP_BPF_ABI_PKT reg_nnr(2)
#define NFP_BPF_ABI_LEN reg_nnr(3)
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)
/**
* struct nfp_insn_meta - BPF instruction wrapper
* @insn: BPF instruction
* @off: index of first generated machine instruction (in nfp_prog.prog)
* @n: eBPF instruction number
* @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;
unsigned int off;
unsigned short n;
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);
}
/**
* 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
* @act: BPF program/action type (TC DA, TC with action, XDP etc.)
* @num_regs: number of registers used by this program
* @regs_per_thread: number of basic registers allocated per thread
* @start_off: address of the first instruction in the memory
* @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
* @insns: list of BPF instruction wrappers (struct nfp_insn_meta)
*/
struct nfp_prog {
u64 *prog;
unsigned int prog_len;
unsigned int __prog_alloc_len;
enum nfp_bpf_action_type act;
unsigned int num_regs;
unsigned int regs_per_thread;
unsigned int start_off;
unsigned int tgt_out;
unsigned int tgt_abort;
unsigned int tgt_done;
unsigned int n_translated;
int error;
struct list_head insns;
};
struct nfp_bpf_result {
unsigned int n_instr;
bool dense_mode;
};
int
nfp_bpf_jit(struct bpf_prog *filter, void *prog, enum nfp_bpf_action_type act,
unsigned int prog_start, unsigned int prog_done,
unsigned int prog_sz, struct nfp_bpf_result *res);
int nfp_prog_verify(struct nfp_prog *nfp_prog, struct bpf_prog *prog);
#endif
|
