+static char *
+patch_port_name(const struct ovsrec_bridge *b1, const struct ovsrec_bridge *b2)
+{
+ return xasprintf("patch-%s-to-%s", b1->name, b2->name);
+}
+
+/*
+ * Return true if the port is a patch port from b1 to b2
+ */
+static bool
+match_patch_port(const struct ovsrec_port *port,
+ const struct ovsrec_bridge *b1,
+ const struct ovsrec_bridge *b2)
+{
+ struct ovsrec_interface *iface;
+ size_t i;
+ char *peer_port_name;
+ bool res = false;
+
+ peer_port_name = patch_port_name(b2, b1);
+
+ for (i = 0; i < port->n_interfaces; i++) {
+ iface = port->interfaces[i];
+ if (strcmp(iface->type, "patch")) {
+ continue;
+ }
+ const char *peer;
+ peer = smap_get(&iface->options, "peer");
+ if (peer && !strcmp(peer, peer_port_name)) {
+ res = true;
+ break;
+ }
+ }
+
+ free(peer_port_name);
+
+ return res;
+}
+
+static void
+create_patch_port(struct controller_ctx *ctx,
+ const char *network,
+ const struct ovsrec_bridge *b1,
+ const struct ovsrec_bridge *b2)
+{
+ if (!ctx->ovs_idl_txn) {
+ return;
+ }
+
+ char *port_name = patch_port_name(b1, b2);
+ char *peer_port_name = patch_port_name(b2, b1);
+
+ ovsdb_idl_txn_add_comment(ctx->ovs_idl_txn,
+ "ovn-controller: creating patch port '%s' from '%s' to '%s'",
+ port_name, b1->name, b2->name);
+
+ struct ovsrec_interface *iface;
+ iface = ovsrec_interface_insert(ctx->ovs_idl_txn);
+ ovsrec_interface_set_name(iface, port_name);
+ ovsrec_interface_set_type(iface, "patch");
+ struct smap options = SMAP_INITIALIZER(&options);
+ smap_add(&options, "peer", peer_port_name);
+ ovsrec_interface_set_options(iface, &options);
+ smap_destroy(&options);
+
+ struct ovsrec_port *port;
+ port = ovsrec_port_insert(ctx->ovs_idl_txn);
+ ovsrec_port_set_name(port, port_name);
+ ovsrec_port_set_interfaces(port, &iface, 1);
+ struct smap ext_ids = SMAP_INITIALIZER(&ext_ids);
+ smap_add(&ext_ids, "ovn-patch-port", network);
+ ovsrec_port_set_external_ids(port, &ext_ids);
+ smap_destroy(&ext_ids);
+
+ struct ovsrec_port **ports;
+ ports = xmalloc(sizeof *ports * (b1->n_ports + 1));
+ memcpy(ports, b1->ports, sizeof *ports * b1->n_ports);
+ ports[b1->n_ports] = port;
+ ovsrec_bridge_verify_ports(b1);
+ ovsrec_bridge_set_ports(b1, ports, b1->n_ports + 1);
+
+ free(ports);
+ free(port_name);
+ free(peer_port_name);
+}
+
+static void
+create_patch_ports(struct controller_ctx *ctx,
+ const char *network,
+ struct shash *existing_ports,
+ const struct ovsrec_bridge *b1,
+ const struct ovsrec_bridge *b2)
+{
+ size_t i;
+
+ for (i = 0; i < b1->n_ports; i++) {
+ if (match_patch_port(b1->ports[i], b1, b2)) {
+ /* Patch port already exists on b1 */
+ shash_find_and_delete(existing_ports, b1->ports[i]->name);
+ break;
+ }
+ }
+ if (i == b1->n_ports) {
+ create_patch_port(ctx, network, b1, b2);
+ }
+}
+
+static void
+init_existing_ports(struct controller_ctx *ctx,
+ struct shash *existing_ports)
+{
+ const struct ovsrec_port *port;
+
+ OVSREC_PORT_FOR_EACH (port, ctx->ovs_idl) {
+ if (smap_get(&port->external_ids, "ovn-patch-port")) {
+ shash_add(existing_ports, port->name, port);
+ }
+ }
+}
+
+static void
+remove_port(struct controller_ctx *ctx,
+ const struct ovsrec_port *port)
+{
+ const struct ovsrec_bridge *bridge;
+
+ /* We know the port we want to delete, but we have to find the bridge its on
+ * to do so. Note this only runs on a config change that should be pretty
+ * rare. */
+ OVSREC_BRIDGE_FOR_EACH (bridge, ctx->ovs_idl) {
+ size_t i;
+ for (i = 0; i < bridge->n_ports; i++) {
+ if (bridge->ports[i] != port) {
+ continue;
+ }
+ struct ovsrec_port **new_ports;
+ new_ports = xmemdup(bridge->ports,
+ sizeof *new_ports * (bridge->n_ports - 1));
+ if (i != bridge->n_ports - 1) {
+ /* Removed port was not last */
+ new_ports[i] = bridge->ports[bridge->n_ports - 1];
+ }
+ ovsrec_bridge_verify_ports(bridge);
+ ovsrec_bridge_set_ports(bridge, new_ports, bridge->n_ports - 1);
+ free(new_ports);
+ ovsrec_port_delete(port);
+ return;
+ }
+ }
+}
+
+static void
+parse_bridge_mappings(struct controller_ctx *ctx,
+ const struct ovsrec_bridge *br_int,
+ const char *mappings_cfg)
+{
+ struct shash existing_ports = SHASH_INITIALIZER(&existing_ports);
+ init_existing_ports(ctx, &existing_ports);
+
+ char *cur, *next, *start;
+ next = start = xstrdup(mappings_cfg);
+ while ((cur = strsep(&next, ",")) && *cur) {
+ char *network, *bridge = cur;
+ const struct ovsrec_bridge *ovs_bridge;
+
+ network = strsep(&bridge, ":");
+ if (!bridge || !*network || !*bridge) {
+ VLOG_ERR("Invalid ovn-bridge-mappings configuration: '%s'",
+ mappings_cfg);
+ break;
+ }
+
+ ovs_bridge = get_bridge(ctx->ovs_idl, bridge);
+ if (!ovs_bridge) {
+ VLOG_WARN("Bridge '%s' not found for network '%s'",
+ bridge, network);
+ continue;
+ }
+
+ create_patch_ports(ctx, network, &existing_ports, br_int, ovs_bridge);
+ create_patch_ports(ctx, network, &existing_ports, ovs_bridge, br_int);
+ }
+ free(start);
+
+ /* Any ports left in existing_ports are related to configuration that has
+ * been removed, so we should delete the ports now. */
+ struct shash_node *port_node, *port_next_node;
+ SHASH_FOR_EACH_SAFE (port_node, port_next_node, &existing_ports) {
+ struct ovsrec_port *port = port_node->data;
+ shash_delete(&existing_ports, port_node);
+ remove_port(ctx, port);
+ }
+ shash_destroy(&existing_ports);
+}
+
+static void
+init_bridge_mappings(struct controller_ctx *ctx,
+ const struct ovsrec_bridge *br_int)
+{
+ const char *mappings_cfg = "";
+ const struct ovsrec_open_vswitch *cfg;
+
+ cfg = ovsrec_open_vswitch_first(ctx->ovs_idl);
+ if (cfg) {
+ mappings_cfg = smap_get(&cfg->external_ids, "ovn-bridge-mappings");
+ if (!mappings_cfg) {
+ mappings_cfg = "";
+ }
+ }
+ parse_bridge_mappings(ctx, br_int, mappings_cfg);
+}
+