1 /*
2  * Copyright (C) 2016 Netronome Systems, Inc.
3  *
4  * This software is dual licensed under the GNU General License Version 2,
5  * June 1991 as shown in the file COPYING in the top-level directory of this
6  * source tree or the BSD 2-Clause License provided below.  You have the
7  * option to license this software under the complete terms of either license.
8  *
9  * The BSD 2-Clause License:
10  *
11  *     Redistribution and use in source and binary forms, with or
12  *     without modification, are permitted provided that the following
13  *     conditions are met:
14  *
15  *      1. Redistributions of source code must retain the above
16  *         copyright notice, this list of conditions and the following
17  *         disclaimer.
18  *
19  *      2. Redistributions in binary form must reproduce the above
20  *         copyright notice, this list of conditions and the following
21  *         disclaimer in the documentation and/or other materials
22  *         provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33 
34 #ifndef __NFP_BPF_H__
35 #define __NFP_BPF_H__ 1
36 
37 #include <linux/bitfield.h>
38 #include <linux/bpf.h>
39 #include <linux/list.h>
40 #include <linux/types.h>
41 
42 #include "../nfp_asm.h"
43 #include "../nfp_net.h"
44 
45 /* For branch fixup logic use up-most byte of branch instruction as scratch
46  * area.  Remember to clear this before sending instructions to HW!
47  */
48 #define OP_BR_SPECIAL	0xff00000000000000ULL
49 
50 enum br_special {
51 	OP_BR_NORMAL = 0,
52 	OP_BR_GO_OUT,
53 	OP_BR_GO_ABORT,
54 };
55 
56 enum static_regs {
57 	STATIC_REG_IMM		= 21, /* Bank AB */
58 	STATIC_REG_PKT_LEN	= 22, /* Bank B */
59 };
60 
61 enum pkt_vec {
62 	PKT_VEC_PKT_LEN		= 0,
63 	PKT_VEC_PKT_PTR		= 2,
64 };
65 
66 enum nfp_bpf_action_type {
67 	NN_ACT_TC_DROP,
68 	NN_ACT_TC_REDIR,
69 	NN_ACT_DIRECT,
70 	NN_ACT_XDP,
71 };
72 
73 #define pv_len(np)	reg_lm(1, PKT_VEC_PKT_LEN)
74 #define pv_ctm_ptr(np)	reg_lm(1, PKT_VEC_PKT_PTR)
75 
76 #define plen_reg(np)	reg_b(STATIC_REG_PKT_LEN)
77 #define pptr_reg(np)	pv_ctm_ptr(np)
78 #define imm_a(np)	reg_a(STATIC_REG_IMM)
79 #define imm_b(np)	reg_b(STATIC_REG_IMM)
80 #define imm_both(np)	reg_both(STATIC_REG_IMM)
81 
82 #define NFP_BPF_ABI_FLAGS	reg_imm(0)
83 #define   NFP_BPF_ABI_FLAG_MARK	1
84 
85 struct nfp_prog;
86 struct nfp_insn_meta;
87 typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *);
88 
89 #define nfp_prog_first_meta(nfp_prog)					\
90 	list_first_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
91 #define nfp_prog_last_meta(nfp_prog)					\
92 	list_last_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
93 #define nfp_meta_next(meta)	list_next_entry(meta, l)
94 #define nfp_meta_prev(meta)	list_prev_entry(meta, l)
95 
96 /**
97  * struct nfp_insn_meta - BPF instruction wrapper
98  * @insn: BPF instruction
99  * @off: index of first generated machine instruction (in nfp_prog.prog)
100  * @n: eBPF instruction number
101  * @skip: skip this instruction (optimized out)
102  * @double_cb: callback for second part of the instruction
103  * @l: link on nfp_prog->insns list
104  */
105 struct nfp_insn_meta {
106 	struct bpf_insn insn;
107 	unsigned int off;
108 	unsigned short n;
109 	bool skip;
110 	instr_cb_t double_cb;
111 
112 	struct list_head l;
113 };
114 
115 #define BPF_SIZE_MASK	0x18
116 
117 static inline u8 mbpf_class(const struct nfp_insn_meta *meta)
118 {
119 	return BPF_CLASS(meta->insn.code);
120 }
121 
122 static inline u8 mbpf_src(const struct nfp_insn_meta *meta)
123 {
124 	return BPF_SRC(meta->insn.code);
125 }
126 
127 static inline u8 mbpf_op(const struct nfp_insn_meta *meta)
128 {
129 	return BPF_OP(meta->insn.code);
130 }
131 
132 static inline u8 mbpf_mode(const struct nfp_insn_meta *meta)
133 {
134 	return BPF_MODE(meta->insn.code);
135 }
136 
137 /**
138  * struct nfp_prog - nfp BPF program
139  * @prog: machine code
140  * @prog_len: number of valid instructions in @prog array
141  * @__prog_alloc_len: alloc size of @prog array
142  * @act: BPF program/action type (TC DA, TC with action, XDP etc.)
143  * @num_regs: number of registers used by this program
144  * @regs_per_thread: number of basic registers allocated per thread
145  * @start_off: address of the first instruction in the memory
146  * @tgt_out: jump target for normal exit
147  * @tgt_abort: jump target for abort (e.g. access outside of packet buffer)
148  * @tgt_done: jump target to get the next packet
149  * @n_translated: number of successfully translated instructions (for errors)
150  * @error: error code if something went wrong
151  * @insns: list of BPF instruction wrappers (struct nfp_insn_meta)
152  */
153 struct nfp_prog {
154 	u64 *prog;
155 	unsigned int prog_len;
156 	unsigned int __prog_alloc_len;
157 
158 	enum nfp_bpf_action_type act;
159 
160 	unsigned int num_regs;
161 	unsigned int regs_per_thread;
162 
163 	unsigned int start_off;
164 	unsigned int tgt_out;
165 	unsigned int tgt_abort;
166 	unsigned int tgt_done;
167 
168 	unsigned int n_translated;
169 	int error;
170 
171 	struct list_head insns;
172 };
173 
174 struct nfp_bpf_result {
175 	unsigned int n_instr;
176 	bool dense_mode;
177 };
178 
179 int
180 nfp_bpf_jit(struct bpf_prog *filter, void *prog, enum nfp_bpf_action_type act,
181 	    unsigned int prog_start, unsigned int prog_done,
182 	    unsigned int prog_sz, struct nfp_bpf_result *res);
183 
184 int nfp_prog_verify(struct nfp_prog *nfp_prog, struct bpf_prog *prog);
185 
186 struct nfp_net;
187 struct tc_cls_bpf_offload;
188 
189 /**
190  * struct nfp_net_bpf_priv - per-vNIC BPF private data
191  * @rx_filter:		Filter offload statistics - dropped packets/bytes
192  * @rx_filter_prev:	Filter offload statistics - values from previous update
193  * @rx_filter_change:	Jiffies when statistics last changed
194  * @rx_filter_stats_timer:  Timer for polling filter offload statistics
195  * @rx_filter_lock:	Lock protecting timer state changes (teardown)
196  */
197 struct nfp_net_bpf_priv {
198 	struct nfp_stat_pair rx_filter, rx_filter_prev;
199 	unsigned long rx_filter_change;
200 	struct timer_list rx_filter_stats_timer;
201 	spinlock_t rx_filter_lock;
202 };
203 
204 int nfp_net_bpf_offload(struct nfp_net *nn, struct tc_cls_bpf_offload *cls_bpf);
205 void nfp_net_filter_stats_timer(unsigned long data);
206 
207 #endif
208