1 #ifndef _NET_FLOW_OFFLOAD_H
2 #define _NET_FLOW_OFFLOAD_H
3 
4 #include <linux/kernel.h>
5 #include <linux/list.h>
6 #include <linux/netlink.h>
7 #include <net/flow_dissector.h>
8 
9 struct flow_match {
10 	struct flow_dissector	*dissector;
11 	void			*mask;
12 	void			*key;
13 };
14 
15 struct flow_match_meta {
16 	struct flow_dissector_key_meta *key, *mask;
17 };
18 
19 struct flow_match_basic {
20 	struct flow_dissector_key_basic *key, *mask;
21 };
22 
23 struct flow_match_control {
24 	struct flow_dissector_key_control *key, *mask;
25 };
26 
27 struct flow_match_eth_addrs {
28 	struct flow_dissector_key_eth_addrs *key, *mask;
29 };
30 
31 struct flow_match_vlan {
32 	struct flow_dissector_key_vlan *key, *mask;
33 };
34 
35 struct flow_match_ipv4_addrs {
36 	struct flow_dissector_key_ipv4_addrs *key, *mask;
37 };
38 
39 struct flow_match_ipv6_addrs {
40 	struct flow_dissector_key_ipv6_addrs *key, *mask;
41 };
42 
43 struct flow_match_ip {
44 	struct flow_dissector_key_ip *key, *mask;
45 };
46 
47 struct flow_match_ports {
48 	struct flow_dissector_key_ports *key, *mask;
49 };
50 
51 struct flow_match_icmp {
52 	struct flow_dissector_key_icmp *key, *mask;
53 };
54 
55 struct flow_match_tcp {
56 	struct flow_dissector_key_tcp *key, *mask;
57 };
58 
59 struct flow_match_mpls {
60 	struct flow_dissector_key_mpls *key, *mask;
61 };
62 
63 struct flow_match_enc_keyid {
64 	struct flow_dissector_key_keyid *key, *mask;
65 };
66 
67 struct flow_match_enc_opts {
68 	struct flow_dissector_key_enc_opts *key, *mask;
69 };
70 
71 struct flow_match_ct {
72 	struct flow_dissector_key_ct *key, *mask;
73 };
74 
75 struct flow_rule;
76 
77 void flow_rule_match_meta(const struct flow_rule *rule,
78 			  struct flow_match_meta *out);
79 void flow_rule_match_basic(const struct flow_rule *rule,
80 			   struct flow_match_basic *out);
81 void flow_rule_match_control(const struct flow_rule *rule,
82 			     struct flow_match_control *out);
83 void flow_rule_match_eth_addrs(const struct flow_rule *rule,
84 			       struct flow_match_eth_addrs *out);
85 void flow_rule_match_vlan(const struct flow_rule *rule,
86 			  struct flow_match_vlan *out);
87 void flow_rule_match_cvlan(const struct flow_rule *rule,
88 			   struct flow_match_vlan *out);
89 void flow_rule_match_ipv4_addrs(const struct flow_rule *rule,
90 				struct flow_match_ipv4_addrs *out);
91 void flow_rule_match_ipv6_addrs(const struct flow_rule *rule,
92 				struct flow_match_ipv6_addrs *out);
93 void flow_rule_match_ip(const struct flow_rule *rule,
94 			struct flow_match_ip *out);
95 void flow_rule_match_ports(const struct flow_rule *rule,
96 			   struct flow_match_ports *out);
97 void flow_rule_match_tcp(const struct flow_rule *rule,
98 			 struct flow_match_tcp *out);
99 void flow_rule_match_icmp(const struct flow_rule *rule,
100 			  struct flow_match_icmp *out);
101 void flow_rule_match_mpls(const struct flow_rule *rule,
102 			  struct flow_match_mpls *out);
103 void flow_rule_match_enc_control(const struct flow_rule *rule,
104 				 struct flow_match_control *out);
105 void flow_rule_match_enc_ipv4_addrs(const struct flow_rule *rule,
106 				    struct flow_match_ipv4_addrs *out);
107 void flow_rule_match_enc_ipv6_addrs(const struct flow_rule *rule,
108 				    struct flow_match_ipv6_addrs *out);
109 void flow_rule_match_enc_ip(const struct flow_rule *rule,
110 			    struct flow_match_ip *out);
111 void flow_rule_match_enc_ports(const struct flow_rule *rule,
112 			       struct flow_match_ports *out);
113 void flow_rule_match_enc_keyid(const struct flow_rule *rule,
114 			       struct flow_match_enc_keyid *out);
115 void flow_rule_match_enc_opts(const struct flow_rule *rule,
116 			      struct flow_match_enc_opts *out);
117 void flow_rule_match_ct(const struct flow_rule *rule,
118 			struct flow_match_ct *out);
119 
120 enum flow_action_id {
121 	FLOW_ACTION_ACCEPT		= 0,
122 	FLOW_ACTION_DROP,
123 	FLOW_ACTION_TRAP,
124 	FLOW_ACTION_GOTO,
125 	FLOW_ACTION_REDIRECT,
126 	FLOW_ACTION_MIRRED,
127 	FLOW_ACTION_REDIRECT_INGRESS,
128 	FLOW_ACTION_MIRRED_INGRESS,
129 	FLOW_ACTION_VLAN_PUSH,
130 	FLOW_ACTION_VLAN_POP,
131 	FLOW_ACTION_VLAN_MANGLE,
132 	FLOW_ACTION_TUNNEL_ENCAP,
133 	FLOW_ACTION_TUNNEL_DECAP,
134 	FLOW_ACTION_MANGLE,
135 	FLOW_ACTION_ADD,
136 	FLOW_ACTION_CSUM,
137 	FLOW_ACTION_MARK,
138 	FLOW_ACTION_PTYPE,
139 	FLOW_ACTION_PRIORITY,
140 	FLOW_ACTION_WAKE,
141 	FLOW_ACTION_QUEUE,
142 	FLOW_ACTION_SAMPLE,
143 	FLOW_ACTION_POLICE,
144 	FLOW_ACTION_CT,
145 	FLOW_ACTION_CT_METADATA,
146 	FLOW_ACTION_MPLS_PUSH,
147 	FLOW_ACTION_MPLS_POP,
148 	FLOW_ACTION_MPLS_MANGLE,
149 	FLOW_ACTION_GATE,
150 	FLOW_ACTION_PPPOE_PUSH,
151 	FLOW_ACTION_JUMP,
152 	FLOW_ACTION_PIPE,
153 	FLOW_ACTION_VLAN_PUSH_ETH,
154 	FLOW_ACTION_VLAN_POP_ETH,
155 	FLOW_ACTION_CONTINUE,
156 	NUM_FLOW_ACTIONS,
157 };
158 
159 /* This is mirroring enum pedit_header_type definition for easy mapping between
160  * tc pedit action. Legacy TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK is mapped to
161  * FLOW_ACT_MANGLE_UNSPEC, which is supported by no driver.
162  */
163 enum flow_action_mangle_base {
164 	FLOW_ACT_MANGLE_UNSPEC		= 0,
165 	FLOW_ACT_MANGLE_HDR_TYPE_ETH,
166 	FLOW_ACT_MANGLE_HDR_TYPE_IP4,
167 	FLOW_ACT_MANGLE_HDR_TYPE_IP6,
168 	FLOW_ACT_MANGLE_HDR_TYPE_TCP,
169 	FLOW_ACT_MANGLE_HDR_TYPE_UDP,
170 };
171 
172 enum flow_action_hw_stats_bit {
173 	FLOW_ACTION_HW_STATS_IMMEDIATE_BIT,
174 	FLOW_ACTION_HW_STATS_DELAYED_BIT,
175 	FLOW_ACTION_HW_STATS_DISABLED_BIT,
176 
177 	FLOW_ACTION_HW_STATS_NUM_BITS
178 };
179 
180 enum flow_action_hw_stats {
181 	FLOW_ACTION_HW_STATS_IMMEDIATE =
182 		BIT(FLOW_ACTION_HW_STATS_IMMEDIATE_BIT),
183 	FLOW_ACTION_HW_STATS_DELAYED = BIT(FLOW_ACTION_HW_STATS_DELAYED_BIT),
184 	FLOW_ACTION_HW_STATS_ANY = FLOW_ACTION_HW_STATS_IMMEDIATE |
185 				   FLOW_ACTION_HW_STATS_DELAYED,
186 	FLOW_ACTION_HW_STATS_DISABLED =
187 		BIT(FLOW_ACTION_HW_STATS_DISABLED_BIT),
188 	FLOW_ACTION_HW_STATS_DONT_CARE = BIT(FLOW_ACTION_HW_STATS_NUM_BITS) - 1,
189 };
190 
191 typedef void (*action_destr)(void *priv);
192 
193 struct flow_action_cookie {
194 	u32 cookie_len;
195 	u8 cookie[];
196 };
197 
198 struct flow_action_cookie *flow_action_cookie_create(void *data,
199 						     unsigned int len,
200 						     gfp_t gfp);
201 void flow_action_cookie_destroy(struct flow_action_cookie *cookie);
202 
203 struct flow_action_entry {
204 	enum flow_action_id		id;
205 	u32				hw_index;
206 	enum flow_action_hw_stats	hw_stats;
207 	action_destr			destructor;
208 	void				*destructor_priv;
209 	union {
210 		u32			chain_index;	/* FLOW_ACTION_GOTO */
211 		struct net_device	*dev;		/* FLOW_ACTION_REDIRECT */
212 		struct {				/* FLOW_ACTION_VLAN */
213 			u16		vid;
214 			__be16		proto;
215 			u8		prio;
216 		} vlan;
217 		struct {				/* FLOW_ACTION_VLAN_PUSH_ETH */
218 			unsigned char dst[ETH_ALEN];
219 			unsigned char src[ETH_ALEN];
220 		} vlan_push_eth;
221 		struct {				/* FLOW_ACTION_MANGLE */
222 							/* FLOW_ACTION_ADD */
223 			enum flow_action_mangle_base htype;
224 			u32		offset;
225 			u32		mask;
226 			u32		val;
227 		} mangle;
228 		struct ip_tunnel_info	*tunnel;	/* FLOW_ACTION_TUNNEL_ENCAP */
229 		u32			csum_flags;	/* FLOW_ACTION_CSUM */
230 		u32			mark;		/* FLOW_ACTION_MARK */
231 		u16                     ptype;          /* FLOW_ACTION_PTYPE */
232 		u32			priority;	/* FLOW_ACTION_PRIORITY */
233 		struct {				/* FLOW_ACTION_QUEUE */
234 			u32		ctx;
235 			u32		index;
236 			u8		vf;
237 		} queue;
238 		struct {				/* FLOW_ACTION_SAMPLE */
239 			struct psample_group	*psample_group;
240 			u32			rate;
241 			u32			trunc_size;
242 			bool			truncate;
243 		} sample;
244 		struct {				/* FLOW_ACTION_POLICE */
245 			u32			burst;
246 			u64			rate_bytes_ps;
247 			u64			peakrate_bytes_ps;
248 			u32			avrate;
249 			u16			overhead;
250 			u64			burst_pkt;
251 			u64			rate_pkt_ps;
252 			u32			mtu;
253 			struct {
254 				enum flow_action_id	act_id;
255 				u32			extval;
256 			} exceed, notexceed;
257 		} police;
258 		struct {				/* FLOW_ACTION_CT */
259 			int action;
260 			u16 zone;
261 			struct nf_flowtable *flow_table;
262 		} ct;
263 		struct {
264 			unsigned long cookie;
265 			u32 mark;
266 			u32 labels[4];
267 			bool orig_dir;
268 		} ct_metadata;
269 		struct {				/* FLOW_ACTION_MPLS_PUSH */
270 			u32		label;
271 			__be16		proto;
272 			u8		tc;
273 			u8		bos;
274 			u8		ttl;
275 		} mpls_push;
276 		struct {				/* FLOW_ACTION_MPLS_POP */
277 			__be16		proto;
278 		} mpls_pop;
279 		struct {				/* FLOW_ACTION_MPLS_MANGLE */
280 			u32		label;
281 			u8		tc;
282 			u8		bos;
283 			u8		ttl;
284 		} mpls_mangle;
285 		struct {
286 			s32		prio;
287 			u64		basetime;
288 			u64		cycletime;
289 			u64		cycletimeext;
290 			u32		num_entries;
291 			struct action_gate_entry *entries;
292 		} gate;
293 		struct {				/* FLOW_ACTION_PPPOE_PUSH */
294 			u16		sid;
295 		} pppoe;
296 	};
297 	struct flow_action_cookie *cookie; /* user defined action cookie */
298 };
299 
300 struct flow_action {
301 	unsigned int			num_entries;
302 	struct flow_action_entry	entries[];
303 };
304 
flow_action_has_entries(const struct flow_action * action)305 static inline bool flow_action_has_entries(const struct flow_action *action)
306 {
307 	return action->num_entries;
308 }
309 
310 /**
311  * flow_offload_has_one_action() - check if exactly one action is present
312  * @action: tc filter flow offload action
313  *
314  * Returns true if exactly one action is present.
315  */
flow_offload_has_one_action(const struct flow_action * action)316 static inline bool flow_offload_has_one_action(const struct flow_action *action)
317 {
318 	return action->num_entries == 1;
319 }
320 
flow_action_is_last_entry(const struct flow_action * action,const struct flow_action_entry * entry)321 static inline bool flow_action_is_last_entry(const struct flow_action *action,
322 					     const struct flow_action_entry *entry)
323 {
324 	return entry == &action->entries[action->num_entries - 1];
325 }
326 
327 #define flow_action_for_each(__i, __act, __actions)			\
328         for (__i = 0, __act = &(__actions)->entries[0];			\
329 	     __i < (__actions)->num_entries;				\
330 	     __act = &(__actions)->entries[++__i])
331 
332 static inline bool
flow_action_mixed_hw_stats_check(const struct flow_action * action,struct netlink_ext_ack * extack)333 flow_action_mixed_hw_stats_check(const struct flow_action *action,
334 				 struct netlink_ext_ack *extack)
335 {
336 	const struct flow_action_entry *action_entry;
337 	u8 last_hw_stats;
338 	int i;
339 
340 	if (flow_offload_has_one_action(action))
341 		return true;
342 
343 	flow_action_for_each(i, action_entry, action) {
344 		if (i && action_entry->hw_stats != last_hw_stats) {
345 			NL_SET_ERR_MSG_MOD(extack, "Mixing HW stats types for actions is not supported");
346 			return false;
347 		}
348 		last_hw_stats = action_entry->hw_stats;
349 	}
350 	return true;
351 }
352 
353 static inline const struct flow_action_entry *
flow_action_first_entry_get(const struct flow_action * action)354 flow_action_first_entry_get(const struct flow_action *action)
355 {
356 	WARN_ON(!flow_action_has_entries(action));
357 	return &action->entries[0];
358 }
359 
360 static inline bool
__flow_action_hw_stats_check(const struct flow_action * action,struct netlink_ext_ack * extack,bool check_allow_bit,enum flow_action_hw_stats_bit allow_bit)361 __flow_action_hw_stats_check(const struct flow_action *action,
362 			     struct netlink_ext_ack *extack,
363 			     bool check_allow_bit,
364 			     enum flow_action_hw_stats_bit allow_bit)
365 {
366 	const struct flow_action_entry *action_entry;
367 
368 	if (!flow_action_has_entries(action))
369 		return true;
370 	if (!flow_action_mixed_hw_stats_check(action, extack))
371 		return false;
372 
373 	action_entry = flow_action_first_entry_get(action);
374 
375 	/* Zero is not a legal value for hw_stats, catch anyone passing it */
376 	WARN_ON_ONCE(!action_entry->hw_stats);
377 
378 	if (!check_allow_bit &&
379 	    ~action_entry->hw_stats & FLOW_ACTION_HW_STATS_ANY) {
380 		NL_SET_ERR_MSG_MOD(extack, "Driver supports only default HW stats type \"any\"");
381 		return false;
382 	} else if (check_allow_bit &&
383 		   !(action_entry->hw_stats & BIT(allow_bit))) {
384 		NL_SET_ERR_MSG_MOD(extack, "Driver does not support selected HW stats type");
385 		return false;
386 	}
387 	return true;
388 }
389 
390 static inline bool
flow_action_hw_stats_check(const struct flow_action * action,struct netlink_ext_ack * extack,enum flow_action_hw_stats_bit allow_bit)391 flow_action_hw_stats_check(const struct flow_action *action,
392 			   struct netlink_ext_ack *extack,
393 			   enum flow_action_hw_stats_bit allow_bit)
394 {
395 	return __flow_action_hw_stats_check(action, extack, true, allow_bit);
396 }
397 
398 static inline bool
flow_action_basic_hw_stats_check(const struct flow_action * action,struct netlink_ext_ack * extack)399 flow_action_basic_hw_stats_check(const struct flow_action *action,
400 				 struct netlink_ext_ack *extack)
401 {
402 	return __flow_action_hw_stats_check(action, extack, false, 0);
403 }
404 
405 struct flow_rule {
406 	struct flow_match	match;
407 	struct flow_action	action;
408 };
409 
410 struct flow_rule *flow_rule_alloc(unsigned int num_actions);
411 
flow_rule_match_key(const struct flow_rule * rule,enum flow_dissector_key_id key)412 static inline bool flow_rule_match_key(const struct flow_rule *rule,
413 				       enum flow_dissector_key_id key)
414 {
415 	return dissector_uses_key(rule->match.dissector, key);
416 }
417 
418 struct flow_stats {
419 	u64	pkts;
420 	u64	bytes;
421 	u64	drops;
422 	u64	lastused;
423 	enum flow_action_hw_stats used_hw_stats;
424 	bool used_hw_stats_valid;
425 };
426 
flow_stats_update(struct flow_stats * flow_stats,u64 bytes,u64 pkts,u64 drops,u64 lastused,enum flow_action_hw_stats used_hw_stats)427 static inline void flow_stats_update(struct flow_stats *flow_stats,
428 				     u64 bytes, u64 pkts,
429 				     u64 drops, u64 lastused,
430 				     enum flow_action_hw_stats used_hw_stats)
431 {
432 	flow_stats->pkts	+= pkts;
433 	flow_stats->bytes	+= bytes;
434 	flow_stats->drops	+= drops;
435 	flow_stats->lastused	= max_t(u64, flow_stats->lastused, lastused);
436 
437 	/* The driver should pass value with a maximum of one bit set.
438 	 * Passing FLOW_ACTION_HW_STATS_ANY is invalid.
439 	 */
440 	WARN_ON(used_hw_stats == FLOW_ACTION_HW_STATS_ANY);
441 	flow_stats->used_hw_stats |= used_hw_stats;
442 	flow_stats->used_hw_stats_valid = true;
443 }
444 
445 enum flow_block_command {
446 	FLOW_BLOCK_BIND,
447 	FLOW_BLOCK_UNBIND,
448 };
449 
450 enum flow_block_binder_type {
451 	FLOW_BLOCK_BINDER_TYPE_UNSPEC,
452 	FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
453 	FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS,
454 	FLOW_BLOCK_BINDER_TYPE_RED_EARLY_DROP,
455 	FLOW_BLOCK_BINDER_TYPE_RED_MARK,
456 };
457 
458 struct flow_block {
459 	struct list_head cb_list;
460 };
461 
462 struct netlink_ext_ack;
463 
464 struct flow_block_offload {
465 	enum flow_block_command command;
466 	enum flow_block_binder_type binder_type;
467 	bool block_shared;
468 	bool unlocked_driver_cb;
469 	struct net *net;
470 	struct flow_block *block;
471 	struct list_head cb_list;
472 	struct list_head *driver_block_list;
473 	struct netlink_ext_ack *extack;
474 	struct Qdisc *sch;
475 	struct list_head *cb_list_head;
476 };
477 
478 enum tc_setup_type;
479 typedef int flow_setup_cb_t(enum tc_setup_type type, void *type_data,
480 			    void *cb_priv);
481 
482 struct flow_block_cb;
483 
484 struct flow_block_indr {
485 	struct list_head		list;
486 	struct net_device		*dev;
487 	struct Qdisc			*sch;
488 	enum flow_block_binder_type	binder_type;
489 	void				*data;
490 	void				*cb_priv;
491 	void				(*cleanup)(struct flow_block_cb *block_cb);
492 };
493 
494 struct flow_block_cb {
495 	struct list_head	driver_list;
496 	struct list_head	list;
497 	flow_setup_cb_t		*cb;
498 	void			*cb_ident;
499 	void			*cb_priv;
500 	void			(*release)(void *cb_priv);
501 	struct flow_block_indr	indr;
502 	unsigned int		refcnt;
503 };
504 
505 struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
506 					  void *cb_ident, void *cb_priv,
507 					  void (*release)(void *cb_priv));
508 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
509 					       void *cb_ident, void *cb_priv,
510 					       void (*release)(void *cb_priv),
511 					       struct flow_block_offload *bo,
512 					       struct net_device *dev,
513 					       struct Qdisc *sch, void *data,
514 					       void *indr_cb_priv,
515 					       void (*cleanup)(struct flow_block_cb *block_cb));
516 void flow_block_cb_free(struct flow_block_cb *block_cb);
517 
518 struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
519 					   flow_setup_cb_t *cb, void *cb_ident);
520 
521 void *flow_block_cb_priv(struct flow_block_cb *block_cb);
522 void flow_block_cb_incref(struct flow_block_cb *block_cb);
523 unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb);
524 
flow_block_cb_add(struct flow_block_cb * block_cb,struct flow_block_offload * offload)525 static inline void flow_block_cb_add(struct flow_block_cb *block_cb,
526 				     struct flow_block_offload *offload)
527 {
528 	list_add_tail(&block_cb->list, &offload->cb_list);
529 }
530 
flow_block_cb_remove(struct flow_block_cb * block_cb,struct flow_block_offload * offload)531 static inline void flow_block_cb_remove(struct flow_block_cb *block_cb,
532 					struct flow_block_offload *offload)
533 {
534 	list_move(&block_cb->list, &offload->cb_list);
535 }
536 
flow_indr_block_cb_remove(struct flow_block_cb * block_cb,struct flow_block_offload * offload)537 static inline void flow_indr_block_cb_remove(struct flow_block_cb *block_cb,
538 					     struct flow_block_offload *offload)
539 {
540 	list_del(&block_cb->indr.list);
541 	list_move(&block_cb->list, &offload->cb_list);
542 }
543 
544 bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
545 			   struct list_head *driver_block_list);
546 
547 int flow_block_cb_setup_simple(struct flow_block_offload *f,
548 			       struct list_head *driver_list,
549 			       flow_setup_cb_t *cb,
550 			       void *cb_ident, void *cb_priv, bool ingress_only);
551 
552 enum flow_cls_command {
553 	FLOW_CLS_REPLACE,
554 	FLOW_CLS_DESTROY,
555 	FLOW_CLS_STATS,
556 	FLOW_CLS_TMPLT_CREATE,
557 	FLOW_CLS_TMPLT_DESTROY,
558 };
559 
560 struct flow_cls_common_offload {
561 	u32 chain_index;
562 	__be16 protocol;
563 	u32 prio;
564 	struct netlink_ext_ack *extack;
565 };
566 
567 struct flow_cls_offload {
568 	struct flow_cls_common_offload common;
569 	enum flow_cls_command command;
570 	unsigned long cookie;
571 	struct flow_rule *rule;
572 	struct flow_stats stats;
573 	u32 classid;
574 };
575 
576 enum offload_act_command  {
577 	FLOW_ACT_REPLACE,
578 	FLOW_ACT_DESTROY,
579 	FLOW_ACT_STATS,
580 };
581 
582 struct flow_offload_action {
583 	struct netlink_ext_ack *extack; /* NULL in FLOW_ACT_STATS process*/
584 	enum offload_act_command  command;
585 	enum flow_action_id id;
586 	u32 index;
587 	struct flow_stats stats;
588 	struct flow_action action;
589 };
590 
591 struct flow_offload_action *offload_action_alloc(unsigned int num_actions);
592 
593 static inline struct flow_rule *
flow_cls_offload_flow_rule(struct flow_cls_offload * flow_cmd)594 flow_cls_offload_flow_rule(struct flow_cls_offload *flow_cmd)
595 {
596 	return flow_cmd->rule;
597 }
598 
flow_block_init(struct flow_block * flow_block)599 static inline void flow_block_init(struct flow_block *flow_block)
600 {
601 	INIT_LIST_HEAD(&flow_block->cb_list);
602 }
603 
604 typedef int flow_indr_block_bind_cb_t(struct net_device *dev, struct Qdisc *sch, void *cb_priv,
605 				      enum tc_setup_type type, void *type_data,
606 				      void *data,
607 				      void (*cleanup)(struct flow_block_cb *block_cb));
608 
609 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv);
610 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
611 			      void (*release)(void *cb_priv));
612 int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
613 				enum tc_setup_type type, void *data,
614 				struct flow_block_offload *bo,
615 				void (*cleanup)(struct flow_block_cb *block_cb));
616 bool flow_indr_dev_exists(void);
617 
618 #endif /* _NET_FLOW_OFFLOAD_H */
619