ofproto/ofproto-dpif.h

   1 /* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
   2  *
   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:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   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. */
  14
  15 #ifndef OFPROTO_DPIF_H
  16 #define OFPROTO_DPIF_H 1
  17
  18 #include <stdint.h>
  19
  20 #include "hmapx.h"
  21 #include "odp-util.h"
  22 #include "ofp-util.h"
  23 #include "ovs-thread.h"
  24 #include "timer.h"
  25 #include "util.h"
  26 #include "ovs-thread.h"
  27
  28 union user_action_cookie;
  29 struct dpif_flow_stats;
  30 struct ofproto;
  31 struct ofproto_dpif;
  32 struct ofproto_packet_in;
  33 struct ofport_dpif;
  34 struct dpif_backer;
  35 struct OVS_LOCKABLE rule_dpif;
  36 struct OVS_LOCKABLE group_dpif;
  37
  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
  41                                              * should be passed to
  42                                              * the controller. */
  43     RULE_DPIF_LOOKUP_VERDICT_DROP,          /* A miss occurred and the packet
  44                                              * should be dropped. */
  45 };
  46
  47 /* For lock annotation below only. */
  48 extern struct ovs_rwlock xlate_rwlock;
  49
  50 /* Ofproto-dpif -- DPIF based ofproto implementation.
  51  *
  52  * Ofproto-dpif provides an ofproto implementation for those platforms which
  53  * implement the netdev and dpif interface defined in netdev.h and dpif.h.  The
  54  * most important of which is the Linux Kernel Module (dpif-linux), but
  55  * alternatives are supported such as a userspace only implementation
  56  * (dpif-netdev), and a dummy implementation used for unit testing.
  57  *
  58  * Ofproto-dpif is divided into three major chunks.
  59  *
  60  * - ofproto-dpif.c
  61  *   The main ofproto-dpif module is responsible for implementing the
  62  *   provider interface, installing and removing datapath flows, maintaining
  63  *   packet statistics, running protocols (BFD, LACP, STP, etc), and
  64  *   configuring relevant submodules.
  65  *
  66  * - ofproto-dpif-upcall.c
  67  *   Ofproto-dpif-upcall is responsible for retrieving upcalls from the kernel,
  68  *   processing miss upcalls, and handing more complex ones up to the main
  69  *   ofproto-dpif module.  Miss upcall processing boils down to figuring out
  70  *   what each packet's actions are, executing them (i.e. asking the kernel to
  71  *   forward it), and handing it up to ofproto-dpif to decided whether or not
  72  *   to install a kernel flow.
  73  *
  74  * - ofproto-dpif-xlate.c
  75  *   Ofproto-dpif-xlate is responsible for translating translating OpenFlow
  76  *   actions into datapath actions. */
  77
  78 size_t ofproto_dpif_get_max_mpls_depth(const struct ofproto_dpif *);
  79
  80 uint8_t rule_dpif_lookup(struct ofproto_dpif *, const struct flow *,
  81                          struct flow_wildcards *, struct rule_dpif **rule);
  82
  83 enum rule_dpif_lookup_verdict rule_dpif_lookup_from_table(struct ofproto_dpif *,
  84                                                           const struct flow *,
  85                                                           struct flow_wildcards *,
  86                                                           bool force_controller_on_miss,
  87                                                           uint8_t *table_id,
  88                                                           struct rule_dpif **rule);
  89
  90 void rule_dpif_ref(struct rule_dpif *);
  91 void rule_dpif_unref(struct rule_dpif *);
  92
  93 void rule_dpif_credit_stats(struct rule_dpif *rule ,
  94                             const struct dpif_flow_stats *);
  95
  96 bool rule_dpif_is_fail_open(const struct rule_dpif *);
  97 bool rule_dpif_is_table_miss(const struct rule_dpif *);
  98 bool rule_dpif_is_internal(const struct rule_dpif *);
  99
 100 struct rule_actions *rule_dpif_get_actions(const struct rule_dpif *);
 101
 102 ovs_be64 rule_dpif_get_flow_cookie(const struct rule_dpif *rule);
 103
 104 void rule_dpif_reduce_timeouts(struct rule_dpif *rule, uint16_t idle_timeout,
 105                                uint16_t hard_timeout);
 106
 107 void choose_miss_rule(enum ofputil_port_config,
 108                       struct rule_dpif *miss_rule,
 109                       struct rule_dpif *no_packet_in_rule,
 110                       struct rule_dpif **rule);
 111
 112 bool group_dpif_lookup(struct ofproto_dpif *ofproto, uint32_t group_id,
 113                        struct group_dpif **group);
 114
 115 void group_dpif_release(struct group_dpif *group);
 116
 117 void group_dpif_get_buckets(const struct group_dpif *group,
 118                             const struct list **buckets);
 119 enum ofp11_group_type group_dpif_get_type(const struct group_dpif *group);
 120
 121 bool ofproto_has_vlan_splinters(const struct ofproto_dpif *);
 122 ofp_port_t vsp_realdev_to_vlandev(const struct ofproto_dpif *,
 123                                   ofp_port_t realdev_ofp_port,
 124                                   ovs_be16 vlan_tci);
 125 bool vsp_adjust_flow(const struct ofproto_dpif *, struct flow *);
 126
 127 int ofproto_dpif_execute_actions(struct ofproto_dpif *, const struct flow *,
 128                                  struct rule_dpif *, const struct ofpact *,
 129                                  size_t ofpacts_len, struct ofpbuf *)
 130     OVS_EXCLUDED(xlate_rwlock);
 131 void ofproto_dpif_send_packet_in(struct ofproto_dpif *,
 132                                  struct ofproto_packet_in *);
 133 int ofproto_dpif_send_packet(const struct ofport_dpif *, struct ofpbuf *);
 134 void ofproto_dpif_flow_mod(struct ofproto_dpif *, struct ofputil_flow_mod *);
 135
 136 struct ofport_dpif *odp_port_to_ofport(const struct dpif_backer *, odp_port_t);
 137
 138 /*
 139  * Recirculation
 140  * =============
 141  *
 142  * Recirculation is a technique to allow a frame to re-enter the packet
 143  * processing path for one or multiple times to achieve more flexible packet
 144  * processing in the data path. MPLS handling and selecting bond slave port
 145  * of a bond ports.
 146  *
 147  * Data path and user space interface
 148  * -----------------------------------
 149  *
 150  * Two new fields, recirc_id and dp_hash, are added to the current flow data
 151  * structure. They are both of type uint32_t. In addition, a new action,
 152  * RECIRC, are added.
 153  *
 154  * The value recirc_id is used to distinguish a packet from multiple
 155  * iterations of recirculation. A packet initially received is considered of
 156  * having recirc_id of 0. Recirc_id is managed by the user space, opaque to
 157  * the data path.
 158  *
 159  * On the other hand, dp_hash can only be computed by the data path, opaque to
 160  * the user space. In fact, user space may not able to recompute the hash
 161  * value. The dp_hash value should be wildcarded when for a newly received
 162  * packet. RECIRC action specifies whether the hash is computed. If computed,
 163  * how many fields to be included in the hash computation. The computed hash
 164  * value is stored into the dp_hash field prior to recirculation.
 165  *
 166  * The RECIRC action computes and set the dp_hash field, set the recirc_id
 167  * field and then reprocess the packet as if it was received on the same input
 168  * port. RECIRC action works like a function call; actions listed behind the
 169  * RECIRC action will be executed after its execution.  RECIRC action can be
 170  * nested, data path implementation limits the number of recirculation executed
 171  * to prevent unreasonable nesting depth or infinite loop.
 172  *
 173  * Both flow fields and the RECIRC action are exposed as open flow fields via
 174  * Nicira extensions.
 175  *
 176  * Post recirculation flow
 177  * ------------------------
 178  *
 179  * At the open flow level, post recirculation rules are always hidden from the
 180  * controller.  They are installed in table 254 which is set up as a hidden
 181  * table during boot time. Those rules are managed by the local user space
 182  * program only.
 183  *
 184  * To speed up the classifier look up process, recirc_id is always reflected
 185  * into the metadata field, since recirc_id is required to be exactly matched.
 186  *
 187  * Classifier look up always starts with table 254. A post recirculation flow
 188  * lookup should find its hidden rule within this table. On the other hand, A
 189  * newly received packet should miss all post recirculation rules because its
 190  * recirc_id is zero, then hit a pre-installed lower priority rule to redirect
 191  * classifier to look up starting from table 0:
 192  *
 193  *       * , actions=resubmit(,0)
 194  *
 195  * Post recirculation data path flows are managed like other data path flows.
 196  * They are created on demand. Miss handling, stats collection and revalidation
 197  * work the same way as regular flows.
 198  */
 199
 200 uint32_t ofproto_dpif_alloc_recirc_id(struct ofproto_dpif *ofproto);
 201 void ofproto_dpif_free_recirc_id(struct ofproto_dpif *ofproto, uint32_t recirc_id);
 202 #endif /* ofproto-dpif.h */