Merge tag 'imx-drm-fixes-2021-04-01' of git://git.pengutronix.de/git/pza/linux into...
[linux-2.6-microblaze.git] / include / net / flow_offload.h
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         NUM_FLOW_ACTIONS,
151 };
152
153 /* This is mirroring enum pedit_header_type definition for easy mapping between
154  * tc pedit action. Legacy TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK is mapped to
155  * FLOW_ACT_MANGLE_UNSPEC, which is supported by no driver.
156  */
157 enum flow_action_mangle_base {
158         FLOW_ACT_MANGLE_UNSPEC          = 0,
159         FLOW_ACT_MANGLE_HDR_TYPE_ETH,
160         FLOW_ACT_MANGLE_HDR_TYPE_IP4,
161         FLOW_ACT_MANGLE_HDR_TYPE_IP6,
162         FLOW_ACT_MANGLE_HDR_TYPE_TCP,
163         FLOW_ACT_MANGLE_HDR_TYPE_UDP,
164 };
165
166 enum flow_action_hw_stats_bit {
167         FLOW_ACTION_HW_STATS_IMMEDIATE_BIT,
168         FLOW_ACTION_HW_STATS_DELAYED_BIT,
169         FLOW_ACTION_HW_STATS_DISABLED_BIT,
170
171         FLOW_ACTION_HW_STATS_NUM_BITS
172 };
173
174 enum flow_action_hw_stats {
175         FLOW_ACTION_HW_STATS_IMMEDIATE =
176                 BIT(FLOW_ACTION_HW_STATS_IMMEDIATE_BIT),
177         FLOW_ACTION_HW_STATS_DELAYED = BIT(FLOW_ACTION_HW_STATS_DELAYED_BIT),
178         FLOW_ACTION_HW_STATS_ANY = FLOW_ACTION_HW_STATS_IMMEDIATE |
179                                    FLOW_ACTION_HW_STATS_DELAYED,
180         FLOW_ACTION_HW_STATS_DISABLED =
181                 BIT(FLOW_ACTION_HW_STATS_DISABLED_BIT),
182         FLOW_ACTION_HW_STATS_DONT_CARE = BIT(FLOW_ACTION_HW_STATS_NUM_BITS) - 1,
183 };
184
185 typedef void (*action_destr)(void *priv);
186
187 struct flow_action_cookie {
188         u32 cookie_len;
189         u8 cookie[];
190 };
191
192 struct flow_action_cookie *flow_action_cookie_create(void *data,
193                                                      unsigned int len,
194                                                      gfp_t gfp);
195 void flow_action_cookie_destroy(struct flow_action_cookie *cookie);
196
197 struct flow_action_entry {
198         enum flow_action_id             id;
199         enum flow_action_hw_stats       hw_stats;
200         action_destr                    destructor;
201         void                            *destructor_priv;
202         union {
203                 u32                     chain_index;    /* FLOW_ACTION_GOTO */
204                 struct net_device       *dev;           /* FLOW_ACTION_REDIRECT */
205                 struct {                                /* FLOW_ACTION_VLAN */
206                         u16             vid;
207                         __be16          proto;
208                         u8              prio;
209                 } vlan;
210                 struct {                                /* FLOW_ACTION_MANGLE */
211                                                         /* FLOW_ACTION_ADD */
212                         enum flow_action_mangle_base htype;
213                         u32             offset;
214                         u32             mask;
215                         u32             val;
216                 } mangle;
217                 struct ip_tunnel_info   *tunnel;        /* FLOW_ACTION_TUNNEL_ENCAP */
218                 u32                     csum_flags;     /* FLOW_ACTION_CSUM */
219                 u32                     mark;           /* FLOW_ACTION_MARK */
220                 u16                     ptype;          /* FLOW_ACTION_PTYPE */
221                 u32                     priority;       /* FLOW_ACTION_PRIORITY */
222                 struct {                                /* FLOW_ACTION_QUEUE */
223                         u32             ctx;
224                         u32             index;
225                         u8              vf;
226                 } queue;
227                 struct {                                /* FLOW_ACTION_SAMPLE */
228                         struct psample_group    *psample_group;
229                         u32                     rate;
230                         u32                     trunc_size;
231                         bool                    truncate;
232                 } sample;
233                 struct {                                /* FLOW_ACTION_POLICE */
234                         u32                     index;
235                         u32                     burst;
236                         u64                     rate_bytes_ps;
237                         u32                     mtu;
238                 } police;
239                 struct {                                /* FLOW_ACTION_CT */
240                         int action;
241                         u16 zone;
242                         struct nf_flowtable *flow_table;
243                 } ct;
244                 struct {
245                         unsigned long cookie;
246                         u32 mark;
247                         u32 labels[4];
248                         bool orig_dir;
249                 } ct_metadata;
250                 struct {                                /* FLOW_ACTION_MPLS_PUSH */
251                         u32             label;
252                         __be16          proto;
253                         u8              tc;
254                         u8              bos;
255                         u8              ttl;
256                 } mpls_push;
257                 struct {                                /* FLOW_ACTION_MPLS_POP */
258                         __be16          proto;
259                 } mpls_pop;
260                 struct {                                /* FLOW_ACTION_MPLS_MANGLE */
261                         u32             label;
262                         u8              tc;
263                         u8              bos;
264                         u8              ttl;
265                 } mpls_mangle;
266                 struct {
267                         u32             index;
268                         s32             prio;
269                         u64             basetime;
270                         u64             cycletime;
271                         u64             cycletimeext;
272                         u32             num_entries;
273                         struct action_gate_entry *entries;
274                 } gate;
275         };
276         struct flow_action_cookie *cookie; /* user defined action cookie */
277 };
278
279 struct flow_action {
280         unsigned int                    num_entries;
281         struct flow_action_entry        entries[];
282 };
283
284 static inline bool flow_action_has_entries(const struct flow_action *action)
285 {
286         return action->num_entries;
287 }
288
289 /**
290  * flow_action_has_one_action() - check if exactly one action is present
291  * @action: tc filter flow offload action
292  *
293  * Returns true if exactly one action is present.
294  */
295 static inline bool flow_offload_has_one_action(const struct flow_action *action)
296 {
297         return action->num_entries == 1;
298 }
299
300 #define flow_action_for_each(__i, __act, __actions)                     \
301         for (__i = 0, __act = &(__actions)->entries[0];                 \
302              __i < (__actions)->num_entries;                            \
303              __act = &(__actions)->entries[++__i])
304
305 static inline bool
306 flow_action_mixed_hw_stats_check(const struct flow_action *action,
307                                  struct netlink_ext_ack *extack)
308 {
309         const struct flow_action_entry *action_entry;
310         u8 last_hw_stats;
311         int i;
312
313         if (flow_offload_has_one_action(action))
314                 return true;
315
316         flow_action_for_each(i, action_entry, action) {
317                 if (i && action_entry->hw_stats != last_hw_stats) {
318                         NL_SET_ERR_MSG_MOD(extack, "Mixing HW stats types for actions is not supported");
319                         return false;
320                 }
321                 last_hw_stats = action_entry->hw_stats;
322         }
323         return true;
324 }
325
326 static inline const struct flow_action_entry *
327 flow_action_first_entry_get(const struct flow_action *action)
328 {
329         WARN_ON(!flow_action_has_entries(action));
330         return &action->entries[0];
331 }
332
333 static inline bool
334 __flow_action_hw_stats_check(const struct flow_action *action,
335                              struct netlink_ext_ack *extack,
336                              bool check_allow_bit,
337                              enum flow_action_hw_stats_bit allow_bit)
338 {
339         const struct flow_action_entry *action_entry;
340
341         if (!flow_action_has_entries(action))
342                 return true;
343         if (!flow_action_mixed_hw_stats_check(action, extack))
344                 return false;
345
346         action_entry = flow_action_first_entry_get(action);
347
348         /* Zero is not a legal value for hw_stats, catch anyone passing it */
349         WARN_ON_ONCE(!action_entry->hw_stats);
350
351         if (!check_allow_bit &&
352             ~action_entry->hw_stats & FLOW_ACTION_HW_STATS_ANY) {
353                 NL_SET_ERR_MSG_MOD(extack, "Driver supports only default HW stats type \"any\"");
354                 return false;
355         } else if (check_allow_bit &&
356                    !(action_entry->hw_stats & BIT(allow_bit))) {
357                 NL_SET_ERR_MSG_MOD(extack, "Driver does not support selected HW stats type");
358                 return false;
359         }
360         return true;
361 }
362
363 static inline bool
364 flow_action_hw_stats_check(const struct flow_action *action,
365                            struct netlink_ext_ack *extack,
366                            enum flow_action_hw_stats_bit allow_bit)
367 {
368         return __flow_action_hw_stats_check(action, extack, true, allow_bit);
369 }
370
371 static inline bool
372 flow_action_basic_hw_stats_check(const struct flow_action *action,
373                                  struct netlink_ext_ack *extack)
374 {
375         return __flow_action_hw_stats_check(action, extack, false, 0);
376 }
377
378 struct flow_rule {
379         struct flow_match       match;
380         struct flow_action      action;
381 };
382
383 struct flow_rule *flow_rule_alloc(unsigned int num_actions);
384
385 static inline bool flow_rule_match_key(const struct flow_rule *rule,
386                                        enum flow_dissector_key_id key)
387 {
388         return dissector_uses_key(rule->match.dissector, key);
389 }
390
391 struct flow_stats {
392         u64     pkts;
393         u64     bytes;
394         u64     drops;
395         u64     lastused;
396         enum flow_action_hw_stats used_hw_stats;
397         bool used_hw_stats_valid;
398 };
399
400 static inline void flow_stats_update(struct flow_stats *flow_stats,
401                                      u64 bytes, u64 pkts,
402                                      u64 drops, u64 lastused,
403                                      enum flow_action_hw_stats used_hw_stats)
404 {
405         flow_stats->pkts        += pkts;
406         flow_stats->bytes       += bytes;
407         flow_stats->drops       += drops;
408         flow_stats->lastused    = max_t(u64, flow_stats->lastused, lastused);
409
410         /* The driver should pass value with a maximum of one bit set.
411          * Passing FLOW_ACTION_HW_STATS_ANY is invalid.
412          */
413         WARN_ON(used_hw_stats == FLOW_ACTION_HW_STATS_ANY);
414         flow_stats->used_hw_stats |= used_hw_stats;
415         flow_stats->used_hw_stats_valid = true;
416 }
417
418 enum flow_block_command {
419         FLOW_BLOCK_BIND,
420         FLOW_BLOCK_UNBIND,
421 };
422
423 enum flow_block_binder_type {
424         FLOW_BLOCK_BINDER_TYPE_UNSPEC,
425         FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS,
426         FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS,
427         FLOW_BLOCK_BINDER_TYPE_RED_EARLY_DROP,
428         FLOW_BLOCK_BINDER_TYPE_RED_MARK,
429 };
430
431 struct flow_block {
432         struct list_head cb_list;
433 };
434
435 struct netlink_ext_ack;
436
437 struct flow_block_offload {
438         enum flow_block_command command;
439         enum flow_block_binder_type binder_type;
440         bool block_shared;
441         bool unlocked_driver_cb;
442         struct net *net;
443         struct flow_block *block;
444         struct list_head cb_list;
445         struct list_head *driver_block_list;
446         struct netlink_ext_ack *extack;
447         struct Qdisc *sch;
448 };
449
450 enum tc_setup_type;
451 typedef int flow_setup_cb_t(enum tc_setup_type type, void *type_data,
452                             void *cb_priv);
453
454 struct flow_block_cb;
455
456 struct flow_block_indr {
457         struct list_head                list;
458         struct net_device               *dev;
459         struct Qdisc                    *sch;
460         enum flow_block_binder_type     binder_type;
461         void                            *data;
462         void                            *cb_priv;
463         void                            (*cleanup)(struct flow_block_cb *block_cb);
464 };
465
466 struct flow_block_cb {
467         struct list_head        driver_list;
468         struct list_head        list;
469         flow_setup_cb_t         *cb;
470         void                    *cb_ident;
471         void                    *cb_priv;
472         void                    (*release)(void *cb_priv);
473         struct flow_block_indr  indr;
474         unsigned int            refcnt;
475 };
476
477 struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
478                                           void *cb_ident, void *cb_priv,
479                                           void (*release)(void *cb_priv));
480 struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
481                                                void *cb_ident, void *cb_priv,
482                                                void (*release)(void *cb_priv),
483                                                struct flow_block_offload *bo,
484                                                struct net_device *dev,
485                                                struct Qdisc *sch, void *data,
486                                                void *indr_cb_priv,
487                                                void (*cleanup)(struct flow_block_cb *block_cb));
488 void flow_block_cb_free(struct flow_block_cb *block_cb);
489
490 struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
491                                            flow_setup_cb_t *cb, void *cb_ident);
492
493 void *flow_block_cb_priv(struct flow_block_cb *block_cb);
494 void flow_block_cb_incref(struct flow_block_cb *block_cb);
495 unsigned int flow_block_cb_decref(struct flow_block_cb *block_cb);
496
497 static inline void flow_block_cb_add(struct flow_block_cb *block_cb,
498                                      struct flow_block_offload *offload)
499 {
500         list_add_tail(&block_cb->list, &offload->cb_list);
501 }
502
503 static inline void flow_block_cb_remove(struct flow_block_cb *block_cb,
504                                         struct flow_block_offload *offload)
505 {
506         list_move(&block_cb->list, &offload->cb_list);
507 }
508
509 static inline void flow_indr_block_cb_remove(struct flow_block_cb *block_cb,
510                                              struct flow_block_offload *offload)
511 {
512         list_del(&block_cb->indr.list);
513         list_move(&block_cb->list, &offload->cb_list);
514 }
515
516 bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
517                            struct list_head *driver_block_list);
518
519 int flow_block_cb_setup_simple(struct flow_block_offload *f,
520                                struct list_head *driver_list,
521                                flow_setup_cb_t *cb,
522                                void *cb_ident, void *cb_priv, bool ingress_only);
523
524 enum flow_cls_command {
525         FLOW_CLS_REPLACE,
526         FLOW_CLS_DESTROY,
527         FLOW_CLS_STATS,
528         FLOW_CLS_TMPLT_CREATE,
529         FLOW_CLS_TMPLT_DESTROY,
530 };
531
532 struct flow_cls_common_offload {
533         u32 chain_index;
534         __be16 protocol;
535         u32 prio;
536         struct netlink_ext_ack *extack;
537 };
538
539 struct flow_cls_offload {
540         struct flow_cls_common_offload common;
541         enum flow_cls_command command;
542         unsigned long cookie;
543         struct flow_rule *rule;
544         struct flow_stats stats;
545         u32 classid;
546 };
547
548 static inline struct flow_rule *
549 flow_cls_offload_flow_rule(struct flow_cls_offload *flow_cmd)
550 {
551         return flow_cmd->rule;
552 }
553
554 static inline void flow_block_init(struct flow_block *flow_block)
555 {
556         INIT_LIST_HEAD(&flow_block->cb_list);
557 }
558
559 typedef int flow_indr_block_bind_cb_t(struct net_device *dev, struct Qdisc *sch, void *cb_priv,
560                                       enum tc_setup_type type, void *type_data,
561                                       void *data,
562                                       void (*cleanup)(struct flow_block_cb *block_cb));
563
564 int flow_indr_dev_register(flow_indr_block_bind_cb_t *cb, void *cb_priv);
565 void flow_indr_dev_unregister(flow_indr_block_bind_cb_t *cb, void *cb_priv,
566                               void (*release)(void *cb_priv));
567 int flow_indr_dev_setup_offload(struct net_device *dev, struct Qdisc *sch,
568                                 enum tc_setup_type type, void *data,
569                                 struct flow_block_offload *bo,
570                                 void (*cleanup)(struct flow_block_cb *block_cb));
571
572 #endif /* _NET_FLOW_OFFLOAD_H */