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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/drivers/net/ethernet/netronome/nfp/bpf/main.h
....@@ -1,35 +1,5 @@
1
-/*
2
- * Copyright (C) 2016-2018 Netronome Systems, Inc.
3
- *
4
- * This software is dual licensed under the GNU General License Version 2,
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- * June 1991 as shown in the file COPYING in the top-level directory of this
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- * source tree or the BSD 2-Clause License provided below.  You have the
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- * option to license this software under the complete terms of either license.
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- *
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- * The BSD 2-Clause License:
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- *
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- *     Redistribution and use in source and binary forms, with or
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- *     without modification, are permitted provided that the following
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- *     conditions are met:
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- *
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- *      1. Redistributions of source code must retain the above
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- *         copyright notice, this list of conditions and the following
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- *         disclaimer.
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- *
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- *      2. Redistributions in binary form must reproduce the above
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- *         copyright notice, this list of conditions and the following
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- *         disclaimer in the documentation and/or other materials
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- *         provided with the distribution.
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- *
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- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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- * SOFTWARE.
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- */
1
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
2
+/* Copyright (C) 2016-2018 Netronome Systems, Inc. */
333 
344 #ifndef __NFP_BPF_H__
355 #define __NFP_BPF_H__ 1
....@@ -44,6 +14,7 @@
4414 #include <linux/types.h>
4515 #include <linux/wait.h>
4616 
17
+#include "../ccm.h"
4718 #include "../nfp_asm.h"
4819 #include "fw.h"
4920 
....@@ -61,6 +32,8 @@
6132 	/* internal jumps to parts of the outro */
6233 	RELO_BR_GO_OUT,
6334 	RELO_BR_GO_ABORT,
35
+	RELO_BR_GO_CALL_PUSH_REGS,
36
+	RELO_BR_GO_CALL_POP_REGS,
6437 	/* external jumps to fixed addresses */
6538 	RELO_BR_NEXT_PKT,
6639 	RELO_BR_HELPER,
....@@ -104,6 +77,7 @@
10477 #define imma_a(np)	reg_a(STATIC_REG_IMMA)
10578 #define imma_b(np)	reg_b(STATIC_REG_IMMA)
10679 #define imm_both(np)	reg_both(STATIC_REG_IMM)
80
+#define ret_reg(np)	imm_a(np)
10781 
10882 #define NFP_BPF_ABI_FLAGS	reg_imm(0)
10983 #define   NFP_BPF_ABI_FLAG_MARK	1
....@@ -111,21 +85,21 @@
11185 /**
11286  * struct nfp_app_bpf - bpf app priv structure
11387  * @app:		backpointer to the app
88
+ * @ccm:		common control message handler data
11489  *
11590  * @bpf_dev:		BPF offload device handle
11691  *
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- * @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
120
- *
121
- * @cmsg_replies:	received cmsg replies waiting to be consumed
122
- * @cmsg_wq:		work queue for waiting for cmsg replies
92
+ * @cmsg_key_sz:	size of key in cmsg element array
93
+ * @cmsg_val_sz:	size of value in cmsg element array
12394  *
12495  * @map_list:		list of offloaded maps
12596  * @maps_in_use:	number of currently offloaded maps
12697  * @map_elems_in_use:	number of elements allocated to offloaded maps
12798  *
12899  * @maps_neutral:	hash table of offload-neutral maps (on pointer)
100
+ *
101
+ * @abi_version:	global BPF ABI version
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+ * @cmsg_cache_cnt:	number of entries to read for caching
129103  *
130104  * @adjust_head:	adjust head capability
131105  * @adjust_head.flags:		extra flags for adjust head
....@@ -151,24 +125,26 @@
151125  * @pseudo_random:	FW initialized the pseudo-random machinery (CSRs)
152126  * @queue_select:	BPF can set the RX queue ID in packet vector
153127  * @adjust_tail:	BPF can simply trunc packet size for adjust tail
128
+ * @cmsg_multi_ent:	FW can pack multiple map entries in a single cmsg
154129  */
155130 struct nfp_app_bpf {
156131 	struct nfp_app *app;
132
+	struct nfp_ccm ccm;
157133 
158134 	struct bpf_offload_dev *bpf_dev;
159135 
160
-	DECLARE_BITMAP(tag_allocator, U16_MAX + 1);
161
-	u16 tag_alloc_next;
162
-	u16 tag_alloc_last;
136
+	unsigned int cmsg_key_sz;
137
+	unsigned int cmsg_val_sz;
163138 
164
-	struct sk_buff_head cmsg_replies;
165
-	struct wait_queue_head cmsg_wq;
139
+	unsigned int cmsg_cache_cnt;
166140 
167141 	struct list_head map_list;
168142 	unsigned int maps_in_use;
169143 	unsigned int map_elems_in_use;
170144 
171145 	struct rhashtable maps_neutral;
146
+
147
+	u32 abi_version;
172148 
173149 	struct nfp_bpf_cap_adjust_head {
174150 		u32 flags;
....@@ -197,6 +173,7 @@
197173 	bool pseudo_random;
198174 	bool queue_select;
199175 	bool adjust_tail;
176
+	bool cmsg_multi_ent;
200177 };
201178 
202179 enum nfp_bpf_map_use {
....@@ -211,11 +188,21 @@
211188 	unsigned char non_zero_update	:1;
212189 };
213190 
191
+#define NFP_BPF_MAP_CACHE_CNT		4U
192
+#define NFP_BPF_MAP_CACHE_TIME_NS	(250 * 1000)
193
+
214194 /**
215195  * struct nfp_bpf_map - private per-map data attached to BPF maps for offload
216196  * @offmap:	pointer to the offloaded BPF map
217197  * @bpf:	back pointer to bpf app private structure
218198  * @tid:	table id identifying map on datapath
199
+ *
200
+ * @cache_lock:	protects @cache_blockers, @cache_to, @cache
201
+ * @cache_blockers:	number of ops in flight which block caching
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+ * @cache_gen:	counter incremented by every blocker on exit
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+ * @cache_to:	time when cache will no longer be valid (ns)
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+ * @cache:	skb with cached response
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+ *
219206  * @l:		link on the nfp_app_bpf->map_list list
220207  * @use_map:	map of how the value is used (in 4B chunks)
221208  */
....@@ -223,6 +210,13 @@
223210 	struct bpf_offloaded_map *offmap;
224211 	struct nfp_app_bpf *bpf;
225212 	u32 tid;
213
+
214
+	spinlock_t cache_lock;
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+	u32 cache_blockers;
216
+	u32 cache_gen;
217
+	u64 cache_to;
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+	struct sk_buff *cache;
219
+
226220 	struct list_head l;
227221 	struct nfp_bpf_map_word use_map[];
228222 };
....@@ -257,7 +251,21 @@
257251 	bool var_off;
258252 };
259253 
260
-#define FLAG_INSN_IS_JUMP_DST	BIT(0)
254
+#define FLAG_INSN_IS_JUMP_DST			BIT(0)
255
+#define FLAG_INSN_IS_SUBPROG_START		BIT(1)
256
+#define FLAG_INSN_PTR_CALLER_STACK_FRAME	BIT(2)
257
+/* Instruction is pointless, noop even on its own */
258
+#define FLAG_INSN_SKIP_NOOP			BIT(3)
259
+/* Instruction is optimized out based on preceding instructions */
260
+#define FLAG_INSN_SKIP_PREC_DEPENDENT		BIT(4)
261
+/* Instruction is optimized by the verifier */
262
+#define FLAG_INSN_SKIP_VERIFIER_OPT		BIT(5)
263
+/* Instruction needs to zero extend to high 32-bit */
264
+#define FLAG_INSN_DO_ZEXT			BIT(6)
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+
266
+#define FLAG_INSN_SKIP_MASK		(FLAG_INSN_SKIP_NOOP | \
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+					 FLAG_INSN_SKIP_PREC_DEPENDENT | \
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+					 FLAG_INSN_SKIP_VERIFIER_OPT)
261269 
262270 /**
263271  * struct nfp_insn_meta - BPF instruction wrapper
....@@ -274,6 +282,7 @@
274282  * @xadd_maybe_16bit: 16bit immediate is possible
275283  * @jmp_dst: destination info for jump instructions
276284  * @jump_neg_op: jump instruction has inverted immediate, use ADD instead of SUB
285
+ * @num_insns_after_br: number of insns following a branch jump, used for fixup
277286  * @func_id: function id for call instructions
278287  * @arg1: arg1 for call instructions
279288  * @arg2: arg2 for call instructions
....@@ -284,7 +293,7 @@
284293  * @off: index of first generated machine instruction (in nfp_prog.prog)
285294  * @n: eBPF instruction number
286295  * @flags: eBPF instruction extra optimization flags
287
- * @skip: skip this instruction (optimized out)
296
+ * @subprog_idx: index of subprogram to which the instruction belongs
288297  * @double_cb: callback for second part of the instruction
289298  * @l: link on nfp_prog->insns list
290299  */
....@@ -309,6 +318,7 @@
309318 		struct {
310319 			struct nfp_insn_meta *jmp_dst;
311320 			bool jump_neg_op;
321
+			u32 num_insns_after_br; /* only for BPF-to-BPF calls */
312322 		};
313323 		/* function calls */
314324 		struct {
....@@ -330,7 +340,7 @@
330340 	unsigned int off;
331341 	unsigned short n;
332342 	unsigned short flags;
333
-	bool skip;
343
+	unsigned short subprog_idx;
334344 	instr_cb_t double_cb;
335345 
336346 	struct list_head l;
....@@ -366,6 +376,21 @@
366376 static inline bool is_mbpf_load(const struct nfp_insn_meta *meta)
367377 {
368378 	return (meta->insn.code & ~BPF_SIZE_MASK) == (BPF_LDX | BPF_MEM);
379
+}
380
+
381
+static inline bool is_mbpf_jmp32(const struct nfp_insn_meta *meta)
382
+{
383
+	return mbpf_class(meta) == BPF_JMP32;
384
+}
385
+
386
+static inline bool is_mbpf_jmp64(const struct nfp_insn_meta *meta)
387
+{
388
+	return mbpf_class(meta) == BPF_JMP;
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+}
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+
391
+static inline bool is_mbpf_jmp(const struct nfp_insn_meta *meta)
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+{
393
+	return is_mbpf_jmp32(meta) || is_mbpf_jmp64(meta);
369394 }
370395 
371396 static inline bool is_mbpf_store(const struct nfp_insn_meta *meta)
....@@ -418,23 +443,71 @@
418443 	return is_mbpf_alu(meta) && mbpf_op(meta) == BPF_DIV;
419444 }
420445 
446
+static inline bool is_mbpf_cond_jump(const struct nfp_insn_meta *meta)
447
+{
448
+	u8 op;
449
+
450
+	if (is_mbpf_jmp32(meta))
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+		return true;
452
+
453
+	if (!is_mbpf_jmp64(meta))
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+		return false;
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+
456
+	op = mbpf_op(meta);
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+	return op != BPF_JA && op != BPF_EXIT && op != BPF_CALL;
458
+}
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+
460
+static inline bool is_mbpf_helper_call(const struct nfp_insn_meta *meta)
461
+{
462
+	struct bpf_insn insn = meta->insn;
463
+
464
+	return insn.code == (BPF_JMP | BPF_CALL) &&
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+		insn.src_reg != BPF_PSEUDO_CALL;
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+}
467
+
468
+static inline bool is_mbpf_pseudo_call(const struct nfp_insn_meta *meta)
469
+{
470
+	struct bpf_insn insn = meta->insn;
471
+
472
+	return insn.code == (BPF_JMP | BPF_CALL) &&
473
+		insn.src_reg == BPF_PSEUDO_CALL;
474
+}
475
+
476
+#define STACK_FRAME_ALIGN 64
477
+
478
+/**
479
+ * struct nfp_bpf_subprog_info - nfp BPF sub-program (a.k.a. function) info
480
+ * @stack_depth:	maximum stack depth used by this sub-program
481
+ * @needs_reg_push:	whether sub-program uses callee-saved registers
482
+ */
483
+struct nfp_bpf_subprog_info {
484
+	u16 stack_depth;
485
+	u8 needs_reg_push : 1;
486
+};
487
+
421488 /**
422489  * struct nfp_prog - nfp BPF program
423490  * @bpf: backpointer to the bpf app priv structure
424491  * @prog: machine code
425492  * @prog_len: number of valid instructions in @prog array
426493  * @__prog_alloc_len: alloc size of @prog array
494
+ * @stack_size: total amount of stack used
427495  * @verifier_meta: temporary storage for verifier's insn meta
428496  * @type: BPF program type
429497  * @last_bpf_off: address of the last instruction translated from BPF
430498  * @tgt_out: jump target for normal exit
431499  * @tgt_abort: jump target for abort (e.g. access outside of packet buffer)
500
+ * @tgt_call_push_regs: jump target for subroutine for saving R6~R9 to stack
501
+ * @tgt_call_pop_regs: jump target for subroutine used for restoring R6~R9
432502  * @n_translated: number of successfully translated instructions (for errors)
433503  * @error: error code if something went wrong
434
- * @stack_depth: max stack depth from the verifier
504
+ * @stack_frame_depth: max stack depth for current frame
435505  * @adjust_head_location: if program has single adjust head call - the insn no.
436506  * @map_records_cnt: the number of map pointers recorded for this prog
507
+ * @subprog_cnt: number of sub-programs, including main function
437508  * @map_records: the map record pointers from bpf->maps_neutral
509
+ * @subprog: pointer to an array of objects holding info about sub-programs
510
+ * @n_insns: number of instructions on @insns list
438511  * @insns: list of BPF instruction wrappers (struct nfp_insn_meta)
439512  */
440513 struct nfp_prog {
....@@ -444,6 +517,8 @@
444517 	unsigned int prog_len;
445518 	unsigned int __prog_alloc_len;
446519 
520
+	unsigned int stack_size;
521
+
447522 	struct nfp_insn_meta *verifier_meta;
448523 
449524 	enum bpf_prog_type type;
....@@ -451,16 +526,21 @@
451526 	unsigned int last_bpf_off;
452527 	unsigned int tgt_out;
453528 	unsigned int tgt_abort;
529
+	unsigned int tgt_call_push_regs;
530
+	unsigned int tgt_call_pop_regs;
454531 
455532 	unsigned int n_translated;
456533 	int error;
457534 
458
-	unsigned int stack_depth;
535
+	unsigned int stack_frame_depth;
459536 	unsigned int adjust_head_location;
460537 
461538 	unsigned int map_records_cnt;
539
+	unsigned int subprog_cnt;
462540 	struct nfp_bpf_neutral_map **map_records;
541
+	struct nfp_bpf_subprog_info *subprog;
463542 
543
+	unsigned int n_insns;
464544 	struct list_head insns;
465545 };
466546 
....@@ -476,11 +556,22 @@
476556 	unsigned int tgt_done;
477557 };
478558 
479
-void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog, unsigned int cnt);
559
+bool nfp_is_subprog_start(struct nfp_insn_meta *meta);
560
+void nfp_bpf_jit_prepare(struct nfp_prog *nfp_prog);
480561 int nfp_bpf_jit(struct nfp_prog *prog);
481562 bool nfp_bpf_supported_opcode(u8 code);
563
+bool nfp_bpf_offload_check_mtu(struct nfp_net *nn, struct bpf_prog *prog,
564
+			       unsigned int mtu);
482565 
483
-extern const struct bpf_prog_offload_ops nfp_bpf_analyzer_ops;
566
+int nfp_verify_insn(struct bpf_verifier_env *env, int insn_idx,
567
+		    int prev_insn_idx);
568
+int nfp_bpf_finalize(struct bpf_verifier_env *env);
569
+
570
+int nfp_bpf_opt_replace_insn(struct bpf_verifier_env *env, u32 off,
571
+			     struct bpf_insn *insn);
572
+int nfp_bpf_opt_remove_insns(struct bpf_verifier_env *env, u32 off, u32 cnt);
573
+
574
+extern const struct bpf_prog_offload_ops nfp_bpf_dev_ops;
484575 
485576 struct netdev_bpf;
486577 struct nfp_app;
....@@ -493,10 +584,13 @@
493584 
494585 struct nfp_insn_meta *
495586 nfp_bpf_goto_meta(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta,
496
-		  unsigned int insn_idx, unsigned int n_insns);
587
+		  unsigned int insn_idx);
497588 
498589 void *nfp_bpf_relo_for_vnic(struct nfp_prog *nfp_prog, struct nfp_bpf_vnic *bv);
499590 
591
+unsigned int nfp_bpf_ctrl_cmsg_min_mtu(struct nfp_app_bpf *bpf);
592
+unsigned int nfp_bpf_ctrl_cmsg_mtu(struct nfp_app_bpf *bpf);
593
+unsigned int nfp_bpf_ctrl_cmsg_cache_cnt(struct nfp_app_bpf *bpf);
500594 long long int
501595 nfp_bpf_ctrl_alloc_map(struct nfp_app_bpf *bpf, struct bpf_map *map);
502596 void