2 * Copyright (C) 2016-2018 Netronome Systems, Inc.
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35 #define __NFP_BPF_H__ 1
37 #include <linux/bitfield.h>
38 #include <linux/bpf.h>
39 #include <linux/bpf_verifier.h>
40 #include <linux/kernel.h>
41 #include <linux/list.h>
42 #include <linux/rhashtable.h>
43 #include <linux/skbuff.h>
44 #include <linux/types.h>
45 #include <linux/wait.h>
47 #include "../nfp_asm.h"
50 #define cmsg_warn(bpf, msg...) nn_dp_warn(&(bpf)->app->ctrl->dp, msg)
52 /* For relocation logic use up-most byte of branch instruction as scratch
53 * area. Remember to clear this before sending instructions to HW!
55 #define OP_RELO_TYPE 0xff00000000000000ULL
59 /* standard internal jumps */
61 /* internal jumps to parts of the outro */
64 /* external jumps to fixed addresses */
67 /* immediate relocation against load address */
71 /* To make absolute relocated branches (branches other than RELO_BR_REL)
72 * distinguishable in user space dumps from normal jumps, add a large offset
75 #define BR_OFF_RELO 15000
78 STATIC_REG_IMMA = 20, /* Bank AB */
79 STATIC_REG_IMM = 21, /* Bank AB */
80 STATIC_REG_STACK = 22, /* Bank A */
81 STATIC_REG_PKT_LEN = 22, /* Bank B */
91 #define PKT_VEL_QSEL_SET_BIT 4
93 #define pv_len(np) reg_lm(1, PKT_VEC_PKT_LEN)
94 #define pv_ctm_ptr(np) reg_lm(1, PKT_VEC_PKT_PTR)
95 #define pv_qsel_set(np) reg_lm(1, PKT_VEC_QSEL_SET)
96 #define pv_qsel_val(np) reg_lm(1, PKT_VEC_QSEL_VAL)
98 #define stack_reg(np) reg_a(STATIC_REG_STACK)
99 #define stack_imm(np) imm_b(np)
100 #define plen_reg(np) reg_b(STATIC_REG_PKT_LEN)
101 #define pptr_reg(np) pv_ctm_ptr(np)
102 #define imm_a(np) reg_a(STATIC_REG_IMM)
103 #define imm_b(np) reg_b(STATIC_REG_IMM)
104 #define imma_a(np) reg_a(STATIC_REG_IMMA)
105 #define imma_b(np) reg_b(STATIC_REG_IMMA)
106 #define imm_both(np) reg_both(STATIC_REG_IMM)
108 #define NFP_BPF_ABI_FLAGS reg_imm(0)
109 #define NFP_BPF_ABI_FLAG_MARK 1
112 * struct nfp_app_bpf - bpf app priv structure
113 * @app: backpointer to the app
115 * @bpf_dev: BPF offload device handle
117 * @tag_allocator: bitmap of control message tags in use
118 * @tag_alloc_next: next tag bit to allocate
119 * @tag_alloc_last: next tag bit to be freed
121 * @cmsg_replies: received cmsg replies waiting to be consumed
122 * @cmsg_wq: work queue for waiting for cmsg replies
124 * @map_list: list of offloaded maps
125 * @maps_in_use: number of currently offloaded maps
126 * @map_elems_in_use: number of elements allocated to offloaded maps
128 * @maps_neutral: hash table of offload-neutral maps (on pointer)
130 * @adjust_head: adjust head capability
131 * @adjust_head.flags: extra flags for adjust head
132 * @adjust_head.off_min: minimal packet offset within buffer required
133 * @adjust_head.off_max: maximum packet offset within buffer required
134 * @adjust_head.guaranteed_sub: negative adjustment guaranteed possible
135 * @adjust_head.guaranteed_add: positive adjustment guaranteed possible
137 * @maps: map capability
138 * @maps.types: supported map types
139 * @maps.max_maps: max number of maps supported
140 * @maps.max_elems: max number of entries in each map
141 * @maps.max_key_sz: max size of map key
142 * @maps.max_val_sz: max size of map value
143 * @maps.max_elem_sz: max size of map entry (key + value)
145 * @helpers: helper addressess for various calls
146 * @helpers.map_lookup: map lookup helper address
147 * @helpers.map_update: map update helper address
148 * @helpers.map_delete: map delete helper address
149 * @helpers.perf_event_output: output perf event to a ring buffer
151 * @pseudo_random: FW initialized the pseudo-random machinery (CSRs)
152 * @queue_select: BPF can set the RX queue ID in packet vector
153 * @adjust_tail: BPF can simply trunc packet size for adjust tail
158 struct bpf_offload_dev *bpf_dev;
160 DECLARE_BITMAP(tag_allocator, U16_MAX + 1);
164 struct sk_buff_head cmsg_replies;
165 struct wait_queue_head cmsg_wq;
167 struct list_head map_list;
168 unsigned int maps_in_use;
169 unsigned int map_elems_in_use;
171 struct rhashtable maps_neutral;
173 struct nfp_bpf_cap_adjust_head {
194 u32 perf_event_output;
202 enum nfp_bpf_map_use {
206 NFP_MAP_USE_ATOMIC_CNT,
209 struct nfp_bpf_map_word {
210 unsigned char type :4;
211 unsigned char non_zero_update :1;
215 * struct nfp_bpf_map - private per-map data attached to BPF maps for offload
216 * @offmap: pointer to the offloaded BPF map
217 * @bpf: back pointer to bpf app private structure
218 * @tid: table id identifying map on datapath
219 * @l: link on the nfp_app_bpf->map_list list
220 * @use_map: map of how the value is used (in 4B chunks)
223 struct bpf_offloaded_map *offmap;
224 struct nfp_app_bpf *bpf;
227 struct nfp_bpf_map_word use_map[];
230 struct nfp_bpf_neutral_map {
237 extern const struct rhashtable_params nfp_bpf_maps_neutral_params;
240 struct nfp_insn_meta;
241 typedef int (*instr_cb_t)(struct nfp_prog *, struct nfp_insn_meta *);
243 #define nfp_prog_first_meta(nfp_prog) \
244 list_first_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
245 #define nfp_prog_last_meta(nfp_prog) \
246 list_last_entry(&(nfp_prog)->insns, struct nfp_insn_meta, l)
247 #define nfp_meta_next(meta) list_next_entry(meta, l)
248 #define nfp_meta_prev(meta) list_prev_entry(meta, l)
251 * struct nfp_bpf_reg_state - register state for calls
252 * @reg: BPF register state from latest path
253 * @var_off: for stack arg - changes stack offset on different paths
255 struct nfp_bpf_reg_state {
256 struct bpf_reg_state reg;
260 #define FLAG_INSN_IS_JUMP_DST BIT(0)
263 * struct nfp_insn_meta - BPF instruction wrapper
264 * @insn: BPF instruction
265 * @ptr: pointer type for memory operations
266 * @ldst_gather_len: memcpy length gathered from load/store sequence
267 * @paired_st: the paired store insn at the head of the sequence
268 * @ptr_not_const: pointer is not always constant
269 * @pkt_cache: packet data cache information
270 * @pkt_cache.range_start: start offset for associated packet data cache
271 * @pkt_cache.range_end: end offset for associated packet data cache
272 * @pkt_cache.do_init: this read needs to initialize packet data cache
273 * @xadd_over_16bit: 16bit immediate is not guaranteed
274 * @xadd_maybe_16bit: 16bit immediate is possible
275 * @jmp_dst: destination info for jump instructions
276 * @jump_neg_op: jump instruction has inverted immediate, use ADD instead of SUB
277 * @func_id: function id for call instructions
278 * @arg1: arg1 for call instructions
279 * @arg2: arg2 for call instructions
280 * @umin_src: copy of core verifier umin_value for src opearnd.
281 * @umax_src: copy of core verifier umax_value for src operand.
282 * @umin_dst: copy of core verifier umin_value for dst opearnd.
283 * @umax_dst: copy of core verifier umax_value for dst operand.
284 * @off: index of first generated machine instruction (in nfp_prog.prog)
285 * @n: eBPF instruction number
286 * @flags: eBPF instruction extra optimization flags
287 * @skip: skip this instruction (optimized out)
288 * @double_cb: callback for second part of the instruction
289 * @l: link on nfp_prog->insns list
291 struct nfp_insn_meta {
292 struct bpf_insn insn;
294 /* pointer ops (ld/st/xadd) */
296 struct bpf_reg_state ptr;
297 struct bpf_insn *paired_st;
305 bool xadd_over_16bit;
306 bool xadd_maybe_16bit;
310 struct nfp_insn_meta *jmp_dst;
316 struct bpf_reg_state arg1;
317 struct nfp_bpf_reg_state arg2;
319 /* We are interested in range info for operands of ALU
320 * operations. For example, shift amount, multiplicand and
332 unsigned short flags;
334 instr_cb_t double_cb;
339 #define BPF_SIZE_MASK 0x18
341 static inline u8 mbpf_class(const struct nfp_insn_meta *meta)
343 return BPF_CLASS(meta->insn.code);
346 static inline u8 mbpf_src(const struct nfp_insn_meta *meta)
348 return BPF_SRC(meta->insn.code);
351 static inline u8 mbpf_op(const struct nfp_insn_meta *meta)
353 return BPF_OP(meta->insn.code);
356 static inline u8 mbpf_mode(const struct nfp_insn_meta *meta)
358 return BPF_MODE(meta->insn.code);
361 static inline bool is_mbpf_alu(const struct nfp_insn_meta *meta)
363 return mbpf_class(meta) == BPF_ALU64 || mbpf_class(meta) == BPF_ALU;
366 static inline bool is_mbpf_load(const struct nfp_insn_meta *meta)
368 return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_LDX | BPF_MEM);
371 static inline bool is_mbpf_store(const struct nfp_insn_meta *meta)
373 return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_MEM);
376 static inline bool is_mbpf_load_pkt(const struct nfp_insn_meta *meta)
378 return is_mbpf_load(meta) && meta->ptr.type == PTR_TO_PACKET;
381 static inline bool is_mbpf_store_pkt(const struct nfp_insn_meta *meta)
383 return is_mbpf_store(meta) && meta->ptr.type == PTR_TO_PACKET;
386 static inline bool is_mbpf_classic_load(const struct nfp_insn_meta *meta)
388 u8 code = meta->insn.code;
390 return BPF_CLASS(code) == BPF_LD &&
391 (BPF_MODE(code) == BPF_ABS || BPF_MODE(code) == BPF_IND);
394 static inline bool is_mbpf_classic_store(const struct nfp_insn_meta *meta)
396 u8 code = meta->insn.code;
398 return BPF_CLASS(code) == BPF_ST && BPF_MODE(code) == BPF_MEM;
401 static inline bool is_mbpf_classic_store_pkt(const struct nfp_insn_meta *meta)
403 return is_mbpf_classic_store(meta) && meta->ptr.type == PTR_TO_PACKET;
406 static inline bool is_mbpf_xadd(const struct nfp_insn_meta *meta)
408 return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_XADD);
411 static inline bool is_mbpf_mul(const struct nfp_insn_meta *meta)
413 return is_mbpf_alu(meta) && mbpf_op(meta) == BPF_MUL;
416 static inline bool is_mbpf_div(const struct nfp_insn_meta *meta)
418 return is_mbpf_alu(meta) && mbpf_op(meta) == BPF_DIV;
422 * struct nfp_prog - nfp BPF program
423 * @bpf: backpointer to the bpf app priv structure
424 * @prog: machine code
425 * @prog_len: number of valid instructions in @prog array
426 * @__prog_alloc_len: alloc size of @prog array
427 * @verifier_meta: temporary storage for verifier's insn meta
428 * @type: BPF program type
429 * @last_bpf_off: address of the last instruction translated from BPF
430 * @tgt_out: jump target for normal exit
431 * @tgt_abort: jump target for abort (e.g. access outside of packet buffer)
432 * @n_translated: number of successfully translated instructions (for errors)
433 * @error: error code if something went wrong
434 * @stack_depth: max stack depth from the verifier
435 * @adjust_head_location: if program has single adjust head call - the insn no.
436 * @map_records_cnt: the number of map pointers recorded for this prog
437 * @map_records: the map record pointers from bpf->maps_neutral
438 * @insns: list of BPF instruction wrappers (struct nfp_insn_meta)
441 struct nfp_app_bpf *bpf;
444 unsigned int prog_len;
445 unsigned int __prog_alloc_len;
447 struct nfp_insn_meta *verifier_meta;
449 enum bpf_prog_type type;
451 unsigned int last_bpf_off;
452 unsigned int tgt_out;
453 unsigned int tgt_abort;
455 unsigned int n_translated;
458 unsigned int stack_depth;
459 unsigned int adjust_head_location;
461 unsigned int map_records_cnt;
462 struct nfp_bpf_neutral_map **map_records;
464 struct list_head insns;
468 * struct nfp_bpf_vnic - per-vNIC BPF priv structure
469 * @tc_prog: currently loaded cls_bpf program
470 * @start_off: address of the first instruction in the memory
471 * @tgt_done: jump target to get the next packet
473 struct nfp_bpf_vnic {
474 struct bpf_prog *tc_prog;
475 unsigned int start_off;
476 unsigned int tgt_done;
479 void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt);
480 int nfp_bpf_jit(struct nfp_prog *prog);
481 bool nfp_bpf_supported_opcode(u8 code);
483 extern const struct bpf_prog_offload_ops nfp_bpf_analyzer_ops;
489 int nfp_ndo_bpf(struct nfp_app *app, struct nfp_net *nn,
490 struct netdev_bpf *bpf);
491 int nfp_net_bpf_offload(struct nfp_net *nn, struct bpf_prog *prog,
492 bool old_prog, struct netlink_ext_ack *extack);
494 struct nfp_insn_meta *
495 nfp_bpf_goto_meta(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
496 unsigned int insn_idx, unsigned int n_insns);
498 void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv);
501 nfp_bpf_ctrl_alloc_map(struct nfp_app_bpf *bpf, struct bpf_map *map);
503 nfp_bpf_ctrl_free_map(struct nfp_app_bpf *bpf, struct nfp_bpf_map *nfp_map);
504 int nfp_bpf_ctrl_getfirst_entry(struct bpf_offloaded_map *offmap,
506 int nfp_bpf_ctrl_update_entry(struct bpf_offloaded_map *offmap,
507 void *key, void *value, u64 flags);
508 int nfp_bpf_ctrl_del_entry(struct bpf_offloaded_map *offmap, void *key);
509 int nfp_bpf_ctrl_lookup_entry(struct bpf_offloaded_map *offmap,
510 void *key, void *value);
511 int nfp_bpf_ctrl_getnext_entry(struct bpf_offloaded_map *offmap,
512 void *key, void *next_key);
514 int nfp_bpf_event_output(struct nfp_app_bpf *bpf, const void *data,
517 void nfp_bpf_ctrl_msg_rx(struct nfp_app *app, struct sk_buff *skb);
519 nfp_bpf_ctrl_msg_rx_raw(struct nfp_app *app, const void *data,