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
23 #include "ovs-thread.h"
26 #include "ovs-thread.h"
28 union user_action_cookie;
29 struct dpif_flow_stats;
32 struct ofproto_packet_in;
35 struct OVS_LOCKABLE rule_dpif;
36 struct OVS_LOCKABLE group_dpif;
38 enum rule_dpif_lookup_verdict {
39 RULE_DPIF_LOOKUP_VERDICT_MATCH, /* A match occurred. */
40 RULE_DPIF_LOOKUP_VERDICT_CONTROLLER, /* A miss occurred and the packet
43 RULE_DPIF_LOOKUP_VERDICT_DROP, /* A miss occurred and the packet
44 * should be dropped. */
45 RULE_DPIF_LOOKUP_VERDICT_DEFAULT, /* A miss occurred and the packet
46 * should handled by the default
48 * For pre-OF1.3 it should be
49 * forwarded to the controller.
50 * For OF1.3+ it should be
54 /* For lock annotation below only. */
55 extern struct ovs_rwlock xlate_rwlock;
57 /* Ofproto-dpif -- DPIF based ofproto implementation.
59 * Ofproto-dpif provides an ofproto implementation for those platforms which
60 * implement the netdev and dpif interface defined in netdev.h and dpif.h. The
61 * most important of which is the Linux Kernel Module (dpif-linux), but
62 * alternatives are supported such as a userspace only implementation
63 * (dpif-netdev), and a dummy implementation used for unit testing.
65 * Ofproto-dpif is divided into three major chunks.
68 * The main ofproto-dpif module is responsible for implementing the
69 * provider interface, installing and removing datapath flows, maintaining
70 * packet statistics, running protocols (BFD, LACP, STP, etc), and
71 * configuring relevant submodules.
73 * - ofproto-dpif-upcall.c
74 * Ofproto-dpif-upcall is responsible for retrieving upcalls from the kernel,
75 * processing miss upcalls, and handing more complex ones up to the main
76 * ofproto-dpif module. Miss upcall processing boils down to figuring out
77 * what each packet's actions are, executing them (i.e. asking the kernel to
78 * forward it), and handing it up to ofproto-dpif to decided whether or not
79 * to install a kernel flow.
81 * - ofproto-dpif-xlate.c
82 * Ofproto-dpif-xlate is responsible for translating translating OpenFlow
83 * actions into datapath actions. */
85 size_t ofproto_dpif_get_max_mpls_depth(const struct ofproto_dpif *);
87 uint8_t rule_dpif_lookup(struct ofproto_dpif *, const struct flow *,
88 struct flow_wildcards *, struct rule_dpif **rule);
90 enum rule_dpif_lookup_verdict rule_dpif_lookup_from_table(struct ofproto_dpif *,
92 struct flow_wildcards *,
93 bool force_controller_on_miss,
95 struct rule_dpif **rule);
97 void rule_dpif_ref(struct rule_dpif *);
98 void rule_dpif_unref(struct rule_dpif *);
100 void rule_dpif_credit_stats(struct rule_dpif *rule ,
101 const struct dpif_flow_stats *);
103 bool rule_dpif_is_fail_open(const struct rule_dpif *);
104 bool rule_dpif_is_table_miss(const struct rule_dpif *);
105 bool rule_dpif_is_internal(const struct rule_dpif *);
107 struct rule_actions *rule_dpif_get_actions(const struct rule_dpif *);
109 ovs_be64 rule_dpif_get_flow_cookie(const struct rule_dpif *rule);
111 void rule_dpif_reduce_timeouts(struct rule_dpif *rule, uint16_t idle_timeout,
112 uint16_t hard_timeout);
114 void choose_miss_rule(enum ofputil_port_config,
115 struct rule_dpif *miss_rule,
116 struct rule_dpif *no_packet_in_rule,
117 struct rule_dpif **rule);
119 bool group_dpif_lookup(struct ofproto_dpif *ofproto, uint32_t group_id,
120 struct group_dpif **group);
122 void group_dpif_release(struct group_dpif *group);
124 void group_dpif_get_buckets(const struct group_dpif *group,
125 const struct list **buckets);
126 enum ofp11_group_type group_dpif_get_type(const struct group_dpif *group);
128 bool ofproto_has_vlan_splinters(const struct ofproto_dpif *);
129 ofp_port_t vsp_realdev_to_vlandev(const struct ofproto_dpif *,
130 ofp_port_t realdev_ofp_port,
132 bool vsp_adjust_flow(const struct ofproto_dpif *, struct flow *);
134 int ofproto_dpif_execute_actions(struct ofproto_dpif *, const struct flow *,
135 struct rule_dpif *, const struct ofpact *,
136 size_t ofpacts_len, struct ofpbuf *)
137 OVS_EXCLUDED(xlate_rwlock);
138 void ofproto_dpif_send_packet_in(struct ofproto_dpif *,
139 struct ofproto_packet_in *);
140 bool ofproto_dpif_wants_packet_in_on_miss(struct ofproto_dpif *);
141 int ofproto_dpif_send_packet(const struct ofport_dpif *, struct ofpbuf *);
142 void ofproto_dpif_flow_mod(struct ofproto_dpif *, struct ofputil_flow_mod *);
144 struct ofport_dpif *odp_port_to_ofport(const struct dpif_backer *, odp_port_t);
150 * Recirculation is a technique to allow a frame to re-enter the packet
151 * processing path for one or multiple times to achieve more flexible packet
152 * processing in the data path. MPLS handling and selecting bond slave port
155 * Data path and user space interface
156 * -----------------------------------
158 * Two new fields, recirc_id and dp_hash, are added to the current flow data
159 * structure. They are both of type uint32_t. In addition, a new action,
162 * The value recirc_id is used to distinguish a packet from multiple
163 * iterations of recirculation. A packet initially received is considered of
164 * having recirc_id of 0. Recirc_id is managed by the user space, opaque to
167 * On the other hand, dp_hash can only be computed by the data path, opaque to
168 * the user space. In fact, user space may not able to recompute the hash
169 * value. The dp_hash value should be wildcarded when for a newly received
170 * packet. RECIRC action specifies whether the hash is computed. If computed,
171 * how many fields to be included in the hash computation. The computed hash
172 * value is stored into the dp_hash field prior to recirculation.
174 * The RECIRC action computes and set the dp_hash field, set the recirc_id
175 * field and then reprocess the packet as if it was received on the same input
176 * port. RECIRC action works like a function call; actions listed behind the
177 * RECIRC action will be executed after its execution. RECIRC action can be
178 * nested, data path implementation limits the number of recirculation executed
179 * to prevent unreasonable nesting depth or infinite loop.
181 * Both flow fields and the RECIRC action are exposed as open flow fields via
184 * Post recirculation flow
185 * ------------------------
187 * At the open flow level, post recirculation rules are always hidden from the
188 * controller. They are installed in table 254 which is set up as a hidden
189 * table during boot time. Those rules are managed by the local user space
192 * To speed up the classifier look up process, recirc_id is always reflected
193 * into the metadata field, since recirc_id is required to be exactly matched.
195 * Classifier look up always starts with table 254. A post recirculation flow
196 * lookup should find its hidden rule within this table. On the other hand, A
197 * newly received packet should miss all post recirculation rules because its
198 * recirc_id is zero, then hit a pre-installed lower priority rule to redirect
199 * classifier to look up starting from table 0:
201 * * , actions=resubmit(,0)
203 * Post recirculation data path flows are managed like other data path flows.
204 * They are created on demand. Miss handling, stats collection and revalidation
205 * work the same way as regular flows.
208 uint32_t ofproto_dpif_alloc_recirc_id(struct ofproto_dpif *ofproto);
209 void ofproto_dpif_free_recirc_id(struct ofproto_dpif *ofproto, uint32_t recirc_id);
210 #endif /* ofproto-dpif.h */