ovn/controller-vtep/binding.c

   1 /* Copyright (c) 2015 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
  16 #include <config.h>
  17 #include "binding.h"
  18
  19 #include "lib/shash.h"
  20 #include "lib/smap.h"
  21 #include "lib/util.h"
  22 #include "openvswitch/vlog.h"
  23 #include "ovn-controller-vtep.h"
  24 #include "ovn/lib/ovn-sb-idl.h"
  25 #include "vtep/vtep-idl.h"
  26
  27 VLOG_DEFINE_THIS_MODULE(binding);
  28
  29 /*
  30  * This module scans through the Port_Binding table in ovnsb.  If there is a
  31  * logical port binding entry for logical switch in vtep gateway chassis's
  32  * 'vtep_logical_switches' column, sets the binding's chassis column to the
  33  * corresponding vtep gateway chassis.
  34  *
  35  */
  36
  37 \f
  38 /* Returns true if the 'vtep_lswitch' specified in 'port_binding_rec'
  39  * has already been bound to another port binding entry, and resets
  40  * 'port_binding_rec''s chassis column.  Otherwise, updates 'ls_to_pb'
  41  * and returns false. */
  42 static bool
  43 check_pb_conflict(struct shash *ls_to_pb,
  44                   const struct sbrec_port_binding *port_binding_rec,
  45                   const char *chassis_name,
  46                   const char *vtep_lswitch)
  47 {
  48     const struct sbrec_port_binding *pb_conflict =
  49         shash_find_data(ls_to_pb, vtep_lswitch);
  50
  51     if (pb_conflict) {
  52         VLOG_WARN("logical switch (%s), on vtep gateway chassis "
  53                   "(%s) has already been associated with logical "
  54                   "port (%s), ignore logical port (%s)",
  55                   vtep_lswitch, chassis_name,
  56                   pb_conflict->logical_port,
  57                   port_binding_rec->logical_port);
  58         sbrec_port_binding_set_chassis(port_binding_rec, NULL);
  59
  60         return true;
  61     }
  62
  63     shash_add(ls_to_pb, vtep_lswitch, port_binding_rec);
  64     return false;
  65 }
  66
  67 /* Returns true if the 'vtep_lswitch' specified in 'port_binding_rec'
  68  * has already been bound to a different datapath, and resets
  69  * 'port_binding_rec''s chassis column.  Otherwise, updates 'ls_to_db' and
  70  * returns false. */
  71 static bool
  72 check_db_conflict(struct shash *ls_to_db,
  73                   const struct sbrec_port_binding *port_binding_rec,
  74                   const char *chassis_name,
  75                   const char *vtep_lswitch)
  76 {
  77     const struct sbrec_datapath_binding *db_conflict =
  78         shash_find_data(ls_to_db, vtep_lswitch);
  79
  80     if (db_conflict && db_conflict != port_binding_rec->datapath) {
  81         VLOG_WARN("logical switch (%s), on vtep gateway chassis "
  82                   "(%s) has already been associated with logical "
  83                   "datapath (with tunnel key %"PRId64"), ignore "
  84                   "logical port (%s) which belongs to logical "
  85                   "datapath (with tunnel key %"PRId64")",
  86                   vtep_lswitch, chassis_name,
  87                   db_conflict->tunnel_key,
  88                   port_binding_rec->logical_port,
  89                   port_binding_rec->datapath->tunnel_key);
  90         sbrec_port_binding_set_chassis(port_binding_rec, NULL);
  91
  92         return true;
  93     }
  94
  95     shash_replace(ls_to_db, vtep_lswitch, port_binding_rec->datapath);
  96     return false;
  97 }
  98
  99 /* Updates the 'port_binding_rec''s chassis column to 'chassis_rec'. */
 100 static void
 101 update_pb_chassis(const struct sbrec_port_binding *port_binding_rec,
 102                   const struct sbrec_chassis *chassis_rec)
 103 {
 104     if (port_binding_rec->chassis != chassis_rec) {
 105         if (chassis_rec && port_binding_rec->chassis) {
 106             VLOG_DBG("Changing chassis association of logical "
 107                      "port (%s) from (%s) to (%s)",
 108                      port_binding_rec->logical_port,
 109                      port_binding_rec->chassis->name,
 110                      chassis_rec->name);
 111         }
 112         sbrec_port_binding_set_chassis(port_binding_rec, chassis_rec);
 113     }
 114 }
 115
 116 \f
 117 /* Checks and updates logical port to vtep logical switch bindings for each
 118  * physical switch in VTEP. */
 119 void
 120 binding_run(struct controller_vtep_ctx *ctx)
 121 {
 122     if (!ctx->ovnsb_idl_txn) {
 123         return;
 124     }
 125
 126     /* 'ls_to_db'
 127      *
 128      * Maps vtep logical switch name to the datapath binding entry.  This is
 129      * used to guarantee that each vtep logical switch is only included
 130      * in only one ovn datapath (ovn logical switch).  See check_db_conflict()
 131      * for details.
 132      *
 133      * 'ls_to_pb'
 134      *
 135      * Maps vtep logical switch name to the port binding entry.  This is used
 136      * to guarantee that each vtep logical switch on a vtep physical switch
 137      * is only bound to one logical port.  See check_pb_conflict() for
 138      * details.
 139      *
 140      */
 141     struct shash ls_to_db = SHASH_INITIALIZER(&ls_to_db);
 142
 143     /* Stores the 'chassis' and the 'ls_to_pb' map related to
 144      * a vtep physcial switch. */
 145     struct ps {
 146         const struct sbrec_chassis *chassis_rec;
 147         struct shash ls_to_pb;
 148     };
 149     struct shash ps_map = SHASH_INITIALIZER(&ps_map);
 150     const struct vteprec_physical_switch *pswitch;
 151     VTEPREC_PHYSICAL_SWITCH_FOR_EACH (pswitch, ctx->vtep_idl) {
 152         const struct sbrec_chassis *chassis_rec
 153             = get_chassis_by_name(ctx->ovnsb_idl, pswitch->name);
 154         struct ps *ps = xmalloc(sizeof *ps);
 155         size_t i;
 156
 157         /* 'chassis_rec' must exist. */
 158         ovs_assert(chassis_rec);
 159         ps->chassis_rec = chassis_rec;
 160         shash_init(&ps->ls_to_pb);
 161         for (i = 0; i < chassis_rec->n_vtep_logical_switches; i++) {
 162             shash_add(&ps->ls_to_pb, chassis_rec->vtep_logical_switches[i],
 163                       NULL);
 164         }
 165         shash_add(&ps_map, chassis_rec->name, ps);
 166     }
 167
 168     ovsdb_idl_txn_add_comment(ctx->ovnsb_idl_txn,
 169                               "ovn-controller-vtep: updating bindings");
 170
 171     const struct sbrec_port_binding *port_binding_rec;
 172     /* Port binding for vtep gateway chassis must have type "vtep",
 173      * and matched physical switch name and logical switch name. */
 174     SBREC_PORT_BINDING_FOR_EACH(port_binding_rec, ctx->ovnsb_idl) {
 175         const char *type = port_binding_rec->type;
 176         const char *vtep_pswitch = smap_get(&port_binding_rec->options,
 177                                             "vtep-physical-switch");
 178         const char *vtep_lswitch = smap_get(&port_binding_rec->options,
 179                                             "vtep-logical-switch");
 180         struct ps *ps
 181             = vtep_pswitch ? shash_find_data(&ps_map, vtep_pswitch) : NULL;
 182         bool found_ls
 183             = ps && vtep_lswitch && shash_find(&ps->ls_to_pb, vtep_lswitch);
 184
 185         if (!strcmp(type, "vtep") && found_ls) {
 186             bool pb_conflict, db_conflict;
 187
 188             pb_conflict = check_pb_conflict(&ps->ls_to_pb, port_binding_rec,
 189                                             ps->chassis_rec->name,
 190                                             vtep_lswitch);
 191             db_conflict = check_db_conflict(&ls_to_db, port_binding_rec,
 192                                             ps->chassis_rec->name,
 193                                             vtep_lswitch);
 194             /* Updates port binding's chassis column when there
 195              * is no conflict. */
 196             if (!pb_conflict && !db_conflict) {
 197                 update_pb_chassis(port_binding_rec, ps->chassis_rec);
 198             }
 199         } else if (port_binding_rec->chassis
 200                    && shash_find(&ps_map, port_binding_rec->chassis->name)) {
 201             /* Resets 'port_binding_rec' since it is no longer bound to
 202              * any vtep logical switch. */
 203             update_pb_chassis(port_binding_rec, NULL);
 204         }
 205     }
 206
 207     struct shash_node *iter, *next;
 208     SHASH_FOR_EACH_SAFE (iter, next, &ps_map) {
 209         struct ps *ps = iter->data;
 210         struct shash_node *node;
 211
 212         SHASH_FOR_EACH (node, &ps->ls_to_pb) {
 213             if (!node->data) {
 214                 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
 215                 VLOG_DBG_RL(&rl, "No port binding entry for logical switch (%s)"
 216                             "on vtep gateway chassis (%s)", node->name,
 217                             ps->chassis_rec->name);
 218             }
 219         }
 220         shash_delete(&ps_map, iter);
 221         shash_destroy(&ps->ls_to_pb);
 222         free(ps);
 223     }
 224     shash_destroy(&ls_to_db);
 225     shash_destroy(&ps_map);
 226 }
 227
 228 /* Removes all port binding association with vtep gateway chassis.
 229  * Returns true when done (i.e. there is no change made to 'ctx->ovnsb_idl'),
 230  * otherwise returns false. */
 231 bool
 232 binding_cleanup(struct controller_vtep_ctx *ctx)
 233 {
 234     if (!ctx->ovnsb_idl_txn) {
 235         return false;
 236     }
 237
 238     struct shash ch_to_pb = SHASH_INITIALIZER(&ch_to_pb);
 239     const struct sbrec_port_binding *port_binding_rec;
 240     bool all_done = true;
 241     /* Hashs all port binding entries using the associated chassis name. */
 242     SBREC_PORT_BINDING_FOR_EACH(port_binding_rec, ctx->ovnsb_idl) {
 243         if (port_binding_rec->chassis) {
 244             shash_add(&ch_to_pb, port_binding_rec->chassis->name,
 245                       port_binding_rec);
 246         }
 247     }
 248
 249     ovsdb_idl_txn_add_comment(ctx->ovnsb_idl_txn,
 250                               "ovn-controller-vtep: removing bindings");
 251
 252     const struct vteprec_physical_switch *pswitch;
 253     VTEPREC_PHYSICAL_SWITCH_FOR_EACH (pswitch, ctx->vtep_idl) {
 254         const struct sbrec_chassis *chassis_rec
 255             = get_chassis_by_name(ctx->ovnsb_idl, pswitch->name);
 256
 257         if (!chassis_rec) {
 258             continue;
 259         }
 260
 261         for (;;) {
 262             port_binding_rec = shash_find_and_delete(&ch_to_pb,
 263                                                      chassis_rec->name);
 264             if (!port_binding_rec) {
 265                 break;
 266             }
 267             all_done = false;
 268             update_pb_chassis(port_binding_rec, NULL);
 269         }
 270     }
 271     shash_destroy(&ch_to_pb);
 272
 273     return all_done;
 274 }