1 /* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License. */
15 #ifndef OFPROTO_DPIF_H
16 #define OFPROTO_DPIF_H 1
20 #include "fail-open.h"
24 #include "ovs-thread.h"
25 #include "ofproto-provider.h"
28 #include "ovs-thread.h"
30 union user_action_cookie;
31 struct dpif_flow_stats;
34 struct ofproto_packet_in;
37 struct OVS_LOCKABLE rule_dpif;
38 struct OVS_LOCKABLE group_dpif;
40 enum rule_dpif_lookup_verdict {
41 RULE_DPIF_LOOKUP_VERDICT_MATCH, /* A match occurred. */
42 RULE_DPIF_LOOKUP_VERDICT_CONTROLLER, /* A miss occurred and the packet
45 RULE_DPIF_LOOKUP_VERDICT_DROP, /* A miss occurred and the packet
46 * should be dropped. */
47 RULE_DPIF_LOOKUP_VERDICT_DEFAULT, /* A miss occurred and the packet
48 * should handled by the default
50 * For pre-OF1.3 it should be
51 * forwarded to the controller.
52 * For OF1.3+ it should be
56 /* Number of implemented OpenFlow tables. */
57 enum { N_TABLES = 255 };
58 enum { TBL_INTERNAL = N_TABLES - 1 }; /* Used for internal hidden rules. */
59 BUILD_ASSERT_DECL(N_TABLES >= 2 && N_TABLES <= 255);
61 /* For lock annotation below only. */
62 extern struct fat_rwlock xlate_rwlock;
64 /* Ofproto-dpif -- DPIF based ofproto implementation.
66 * Ofproto-dpif provides an ofproto implementation for those platforms which
67 * implement the netdev and dpif interface defined in netdev.h and dpif.h. The
68 * most important of which is the Linux Kernel Module (dpif-linux), but
69 * alternatives are supported such as a userspace only implementation
70 * (dpif-netdev), and a dummy implementation used for unit testing.
72 * Ofproto-dpif is divided into three major chunks.
75 * The main ofproto-dpif module is responsible for implementing the
76 * provider interface, installing and removing datapath flows, maintaining
77 * packet statistics, running protocols (BFD, LACP, STP, etc), and
78 * configuring relevant submodules.
80 * - ofproto-dpif-upcall.c
81 * Ofproto-dpif-upcall is responsible for retrieving upcalls from the kernel,
82 * processing miss upcalls, and handing more complex ones up to the main
83 * ofproto-dpif module. Miss upcall processing boils down to figuring out
84 * what each packet's actions are, executing them (i.e. asking the kernel to
85 * forward it), and handing it up to ofproto-dpif to decided whether or not
86 * to install a kernel flow.
88 * - ofproto-dpif-xlate.c
89 * Ofproto-dpif-xlate is responsible for translating OpenFlow actions into
90 * datapath actions. */
92 size_t ofproto_dpif_get_max_mpls_depth(const struct ofproto_dpif *);
93 bool ofproto_dpif_get_enable_recirc(const struct ofproto_dpif *);
95 uint8_t rule_dpif_lookup(struct ofproto_dpif *, struct flow *,
96 struct flow_wildcards *, struct rule_dpif **rule,
99 /* If 'recirc_id' is set, starts looking up from internal table for
100 * post recirculation flows or packets. Otherwise, starts from table 0. */
101 static inline uint8_t
102 rule_dpif_lookup_get_init_table_id(const struct flow *flow)
104 return flow->recirc_id ? TBL_INTERNAL : 0;
107 enum rule_dpif_lookup_verdict rule_dpif_lookup_from_table(struct ofproto_dpif *,
109 struct flow_wildcards *,
110 bool force_controller_on_miss,
112 struct rule_dpif **rule,
115 static inline void rule_dpif_ref(struct rule_dpif *);
116 static inline void rule_dpif_unref(struct rule_dpif *);
118 void rule_dpif_credit_stats(struct rule_dpif *rule ,
119 const struct dpif_flow_stats *);
121 static inline bool rule_dpif_is_fail_open(const struct rule_dpif *);
122 static inline bool rule_dpif_is_table_miss(const struct rule_dpif *);
123 static inline bool rule_dpif_is_internal(const struct rule_dpif *);
125 uint8_t rule_dpif_get_table(const struct rule_dpif *);
127 bool table_is_internal(uint8_t table_id);
129 const struct rule_actions *rule_dpif_get_actions(const struct rule_dpif *);
131 ovs_be64 rule_dpif_get_flow_cookie(const struct rule_dpif *rule);
133 void rule_dpif_reduce_timeouts(struct rule_dpif *rule, uint16_t idle_timeout,
134 uint16_t hard_timeout);
136 void choose_miss_rule(enum ofputil_port_config,
137 struct rule_dpif *miss_rule,
138 struct rule_dpif *no_packet_in_rule,
139 struct rule_dpif **rule, bool take_ref);
141 bool group_dpif_lookup(struct ofproto_dpif *ofproto, uint32_t group_id,
142 struct group_dpif **group);
144 void group_dpif_release(struct group_dpif *group);
146 void group_dpif_get_buckets(const struct group_dpif *group,
147 const struct list **buckets);
148 enum ofp11_group_type group_dpif_get_type(const struct group_dpif *group);
150 bool ofproto_has_vlan_splinters(const struct ofproto_dpif *);
151 ofp_port_t vsp_realdev_to_vlandev(const struct ofproto_dpif *,
152 ofp_port_t realdev_ofp_port,
154 bool vsp_adjust_flow(const struct ofproto_dpif *, struct flow *);
156 int ofproto_dpif_execute_actions(struct ofproto_dpif *, const struct flow *,
157 struct rule_dpif *, const struct ofpact *,
158 size_t ofpacts_len, struct ofpbuf *)
159 OVS_EXCLUDED(xlate_rwlock);
160 void ofproto_dpif_send_packet_in(struct ofproto_dpif *,
161 struct ofproto_packet_in *);
162 bool ofproto_dpif_wants_packet_in_on_miss(struct ofproto_dpif *);
163 int ofproto_dpif_send_packet(const struct ofport_dpif *, struct ofpbuf *);
164 void ofproto_dpif_flow_mod(struct ofproto_dpif *, struct ofputil_flow_mod *);
165 struct rule_dpif *ofproto_dpif_refresh_rule(struct rule_dpif *);
167 struct ofport_dpif *odp_port_to_ofport(const struct dpif_backer *, odp_port_t);
173 * Recirculation is a technique to allow a frame to re-enter the packet
174 * processing path for one or multiple times to achieve more flexible packet
175 * processing in the data path. MPLS handling and selecting bond slave port
178 * Data path and user space interface
179 * -----------------------------------
181 * Two new fields, recirc_id and dp_hash, are added to the current flow data
182 * structure. They are both of type uint32_t. In addition, a new action,
185 * The value recirc_id is used to distinguish a packet from multiple
186 * iterations of recirculation. A packet initially received is considered of
187 * having recirc_id of 0. Recirc_id is managed by the user space, opaque to
190 * On the other hand, dp_hash can only be computed by the data path, opaque to
191 * the user space. In fact, user space may not able to recompute the hash
192 * value. The dp_hash value should be wildcarded when for a newly received
193 * packet. RECIRC action specifies whether the hash is computed. If computed,
194 * how many fields to be included in the hash computation. The computed hash
195 * value is stored into the dp_hash field prior to recirculation.
197 * The RECIRC action computes and set the dp_hash field, set the recirc_id
198 * field and then reprocess the packet as if it was received on the same input
199 * port. RECIRC action works like a function call; actions listed behind the
200 * RECIRC action will be executed after its execution. RECIRC action can be
201 * nested, data path implementation limits the number of recirculation executed
202 * to prevent unreasonable nesting depth or infinite loop.
204 * Both flow fields and the RECIRC action are exposed as open flow fields via
207 * Post recirculation flow
208 * ------------------------
210 * At the open flow level, post recirculation rules are always hidden from the
211 * controller. They are installed in table 254 which is set up as a hidden
212 * table during boot time. Those rules are managed by the local user space
215 * To speed up the classifier look up process, recirc_id is always reflected
216 * into the metadata field, since recirc_id is required to be exactly matched.
218 * Classifier look up always starts with table 254. A post recirculation flow
219 * lookup should find its hidden rule within this table. On the other hand, A
220 * newly received packet should miss all post recirculation rules because its
221 * recirc_id is zero, then hit a pre-installed lower priority rule to redirect
222 * classifier to look up starting from table 0:
224 * * , actions=resubmit(,0)
226 * Post recirculation data path flows are managed like other data path flows.
227 * They are created on demand. Miss handling, stats collection and revalidation
228 * work the same way as regular flows.
230 * If the bridge which originates the recirculation is different from the bridge
231 * that receives the post recirculation packet (e.g. when patch port is used),
232 * the packet will be processed directly by the recirculation bridge with
233 * in_port set to OFPP_NONE. Admittedly, doing this limits the recirculation
234 * bridge from matching on in_port of post recirculation packets, and will be
235 * fixed in the near future.
237 * TODO: Always restore the correct in_port.
241 struct ofproto_dpif *ofproto_dpif_recirc_get_ofproto(const struct dpif_backer *ofproto,
243 uint32_t ofproto_dpif_alloc_recirc_id(struct ofproto_dpif *ofproto);
244 void ofproto_dpif_free_recirc_id(struct ofproto_dpif *ofproto, uint32_t recirc_id);
245 int ofproto_dpif_add_internal_flow(struct ofproto_dpif *,
246 const struct match *, int priority,
247 const struct ofpbuf *ofpacts,
248 struct rule **rulep);
249 int ofproto_dpif_delete_internal_flow(struct ofproto_dpif *, struct match *,
252 /* struct rule_dpif has struct rule as it's first member. */
253 #define RULE_CAST(RULE) ((struct rule *)RULE)
255 static inline void rule_dpif_ref(struct rule_dpif *rule)
258 ofproto_rule_ref(RULE_CAST(rule));
262 static inline void rule_dpif_unref(struct rule_dpif *rule)
265 ofproto_rule_unref(RULE_CAST(rule));
269 static inline bool rule_dpif_is_fail_open(const struct rule_dpif *rule)
271 return is_fail_open_rule(RULE_CAST(rule));
274 static inline bool rule_dpif_is_table_miss(const struct rule_dpif *rule)
276 return rule_is_table_miss(RULE_CAST(rule));
279 /* Returns true if 'rule' is an internal rule, false otherwise. */
280 static inline bool rule_dpif_is_internal(const struct rule_dpif *rule)
282 return RULE_CAST(rule)->table_id == TBL_INTERNAL;
287 #endif /* ofproto-dpif.h */