1 /*
2  * Copyright (C) 2016-2017 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/bpf_verifier.h>
40 #include <linux/list.h>
41 #include <linux/types.h>
42 
43 #include "../nfp_asm.h"
44 
45 /* For relocation 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_RELO_TYPE	0xff00000000000000ULL
49 
50 enum nfp_relo_type {
51 	RELO_NONE = 0,
52 	/* standard internal jumps */
53 	RELO_BR_REL,
54 	/* internal jumps to parts of the outro */
55 	RELO_BR_GO_OUT,
56 	RELO_BR_GO_ABORT,
57 	/* external jumps to fixed addresses */
58 	RELO_BR_NEXT_PKT,
59 };
60 
61 /* To make absolute relocated branches (branches other than RELO_BR_REL)
62  * distinguishable in user space dumps from normal jumps, add a large offset
63  * to them.
64  */
65 #define BR_OFF_RELO		15000
66 
67 enum static_regs {
68 	STATIC_REG_IMM		= 21, /* Bank AB */
69 	STATIC_REG_STACK	= 22, /* Bank A */
70 	STATIC_REG_PKT_LEN	= 22, /* Bank B */
71 };
72 
73 enum pkt_vec {
74 	PKT_VEC_PKT_LEN		= 0,
75 	PKT_VEC_PKT_PTR		= 2,
76 };
77 
78 #define pv_len(np)	reg_lm(1, PKT_VEC_PKT_LEN)
79 #define pv_ctm_ptr(np)	reg_lm(1, PKT_VEC_PKT_PTR)
80 
81 #define stack_reg(np)	reg_a(STATIC_REG_STACK)
82 #define stack_imm(np)	imm_b(np)
83 #define plen_reg(np)	reg_b(STATIC_REG_PKT_LEN)
84 #define pptr_reg(np)	pv_ctm_ptr(np)
85 #define imm_a(np)	reg_a(STATIC_REG_IMM)
86 #define imm_b(np)	reg_b(STATIC_REG_IMM)
87 #define imm_both(np)	reg_both(STATIC_REG_IMM)
88 
89 #define NFP_BPF_ABI_FLAGS	reg_imm(0)
90 #define   NFP_BPF_ABI_FLAG_MARK	1
91 
92 /**
93  * struct nfp_app_bpf - bpf app priv structure
94  * @app:		backpointer to the app
95  *
96  * @map_list:		list of offloaded maps
97  *
98  * @adjust_head:	adjust head capability
99  * @flags:		extra flags for adjust head
100  * @off_min:		minimal packet offset within buffer required
101  * @off_max:		maximum packet offset within buffer required
102  * @guaranteed_sub:	amount of negative adjustment guaranteed possible
103  * @guaranteed_add:	amount of positive adjustment guaranteed possible
104  */
105 struct nfp_app_bpf {
106 	struct nfp_app *app;
107 
108 	struct list_head map_list;
109 
110 	struct nfp_bpf_cap_adjust_head {
111 		u32 flags;
112 		int off_min;
113 		int off_max;
114 		int guaranteed_sub;
115 		int guaranteed_add;
116 	} adjust_head;
117 };
118 
119 /**
120  * struct nfp_bpf_map - private per-map data attached to BPF maps for offload
121  * @offmap:	pointer to the offloaded BPF map
122  * @bpf:	back pointer to bpf app private structure
123  * @tid:	table id identifying map on datapath
124  * @l:		link on the nfp_app_bpf->map_list list
125  */
126 struct nfp_bpf_map {
127 	struct bpf_offloaded_map *offmap;
128 	struct nfp_app_bpf *bpf;
129 	u32 tid;
130 	struct list_head l;
131 };
132 
133 struct nfp_prog;
134 struct nfp_insn_meta;
135 typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *);
136 
137 #define nfp_prog_first_meta(nfp_prog)					\
138 	list_first_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
139 #define nfp_prog_last_meta(nfp_prog)					\
140 	list_last_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
141 #define nfp_meta_next(meta)	list_next_entry(meta, l)
142 #define nfp_meta_prev(meta)	list_prev_entry(meta, l)
143 
144 #define FLAG_INSN_IS_JUMP_DST	BIT(0)
145 
146 /**
147  * struct nfp_insn_meta - BPF instruction wrapper
148  * @insn: BPF instruction
149  * @ptr: pointer type for memory operations
150  * @ldst_gather_len: memcpy length gathered from load/store sequence
151  * @paired_st: the paired store insn at the head of the sequence
152  * @arg2: arg2 for call instructions
153  * @ptr_not_const: pointer is not always constant
154  * @jmp_dst: destination info for jump instructions
155  * @off: index of first generated machine instruction (in nfp_prog.prog)
156  * @n: eBPF instruction number
157  * @flags: eBPF instruction extra optimization flags
158  * @skip: skip this instruction (optimized out)
159  * @double_cb: callback for second part of the instruction
160  * @l: link on nfp_prog->insns list
161  */
162 struct nfp_insn_meta {
163 	struct bpf_insn insn;
164 	union {
165 		struct {
166 			struct bpf_reg_state ptr;
167 			struct bpf_insn *paired_st;
168 			s16 ldst_gather_len;
169 			bool ptr_not_const;
170 		};
171 		struct nfp_insn_meta *jmp_dst;
172 		struct bpf_reg_state arg2;
173 	};
174 	unsigned int off;
175 	unsigned short n;
176 	unsigned short flags;
177 	bool skip;
178 	instr_cb_t double_cb;
179 
180 	struct list_head l;
181 };
182 
183 #define BPF_SIZE_MASK	0x18
184 
185 static inline u8 mbpf_class(const struct nfp_insn_meta *meta)
186 {
187 	return BPF_CLASS(meta->insn.code);
188 }
189 
190 static inline u8 mbpf_src(const struct nfp_insn_meta *meta)
191 {
192 	return BPF_SRC(meta->insn.code);
193 }
194 
195 static inline u8 mbpf_op(const struct nfp_insn_meta *meta)
196 {
197 	return BPF_OP(meta->insn.code);
198 }
199 
200 static inline u8 mbpf_mode(const struct nfp_insn_meta *meta)
201 {
202 	return BPF_MODE(meta->insn.code);
203 }
204 
205 static inline bool is_mbpf_load(const struct nfp_insn_meta *meta)
206 {
207 	return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_LDX | BPF_MEM);
208 }
209 
210 static inline bool is_mbpf_store(const struct nfp_insn_meta *meta)
211 {
212 	return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_MEM);
213 }
214 
215 /**
216  * struct nfp_prog - nfp BPF program
217  * @bpf: backpointer to the bpf app priv structure
218  * @prog: machine code
219  * @prog_len: number of valid instructions in @prog array
220  * @__prog_alloc_len: alloc size of @prog array
221  * @verifier_meta: temporary storage for verifier's insn meta
222  * @type: BPF program type
223  * @last_bpf_off: address of the last instruction translated from BPF
224  * @tgt_out: jump target for normal exit
225  * @tgt_abort: jump target for abort (e.g. access outside of packet buffer)
226  * @n_translated: number of successfully translated instructions (for errors)
227  * @error: error code if something went wrong
228  * @stack_depth: max stack depth from the verifier
229  * @adjust_head_location: if program has single adjust head call - the insn no.
230  * @insns: list of BPF instruction wrappers (struct nfp_insn_meta)
231  */
232 struct nfp_prog {
233 	struct nfp_app_bpf *bpf;
234 
235 	u64 *prog;
236 	unsigned int prog_len;
237 	unsigned int __prog_alloc_len;
238 
239 	struct nfp_insn_meta *verifier_meta;
240 
241 	enum bpf_prog_type type;
242 
243 	unsigned int last_bpf_off;
244 	unsigned int tgt_out;
245 	unsigned int tgt_abort;
246 
247 	unsigned int n_translated;
248 	int error;
249 
250 	unsigned int stack_depth;
251 	unsigned int adjust_head_location;
252 
253 	struct list_head insns;
254 };
255 
256 /**
257  * struct nfp_bpf_vnic - per-vNIC BPF priv structure
258  * @tc_prog:	currently loaded cls_bpf program
259  * @start_off:	address of the first instruction in the memory
260  * @tgt_done:	jump target to get the next packet
261  */
262 struct nfp_bpf_vnic {
263 	struct bpf_prog *tc_prog;
264 	unsigned int start_off;
265 	unsigned int tgt_done;
266 };
267 
268 void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt);
269 int nfp_bpf_jit(struct nfp_prog *prog);
270 
271 extern const struct bpf_prog_offload_ops nfp_bpf_analyzer_ops;
272 
273 struct netdev_bpf;
274 struct nfp_app;
275 struct nfp_net;
276 
277 int nfp_ndo_bpf(struct nfp_app *app, struct nfp_net *nn,
278 		struct netdev_bpf *bpf);
279 int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog,
280 			bool old_prog);
281 
282 struct nfp_insn_meta *
283 nfp_bpf_goto_meta(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
284 		  unsigned int insn_idx, unsigned int n_insns);
285 
286 void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv);
287 #endif
288