summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/netronome/nfp/bpf/main.h
blob: 57b6043177a3891c49096ab85906ee539b3d5ecb (plain)
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
/*
 * 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/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)

/**
 * struct nfp_insn_meta - BPF instruction wrapper
 * @insn: BPF instruction
 * @ptr: pointer type for memory operations
 * @ptr_not_const: pointer is not always constant
 * @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;
	struct bpf_reg_state ptr;
	bool ptr_not_const;
	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
 * @verifier_meta: temporary storage for verifier's insn meta
 * @type: BPF program type
 * @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
 * @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 tgt_out;
	unsigned int tgt_abort;
	unsigned int tgt_done;

	unsigned int n_translated;
	int error;

	unsigned int stack_depth;

	struct list_head insns;
};

/**
 * struct nfp_bpf_vnic - per-vNIC BPF priv structure
 * @tc_prog:	currently loaded cls_bpf program
 */
struct nfp_bpf_vnic {
	struct bpf_prog *tc_prog;
};

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);
#endif