On 8/14/25 7:36 PM, Ales Musil via dev wrote:
> Pair learned remote VTEPs with their respective datapaths and tunnel
> ports. This creates binding that can be used for physical flows. In
> order to accommodate for multicast groups we need to also create
> specific EVPN multicast groups.
>
> All data are ovn-controller specific due to the nature of EVPN and
> also to avoid possible scalability issues within SB database.
>
> Those bindings and multicast groups are used in later commits to
> create physical flows responsible for the delivery.
>
> Note that there isn't any way to set vni for given LS that will
> be part of future patch ("dynamic-routing-vni").
>
> Acked-by: Xavier Simonart <xsimo...@redhat.com>
> Signed-off-by: Ales Musil <amu...@redhat.com>
> ---
> v4: Rebase on top of latest main.
> Add Xavier's ack.
> Address review comments:
> - Add missing hash_init() and use has_int() instead of hash_add().
>
> v3: Rebase on top of latest main.
> Rename "tunnel_key" to "binding_key".
> Adjust the tunnel search to use the tunnels created by ovn.
>
> v2: Rebase on top of latest main.
> Fix small memory leak that was present in multicast groups.
> Address nits from Dumitru.
> ---
> controller/automake.mk | 2 +
> controller/evpn-binding.c | 416 ++++++++++++++++++++++++++++++++++++
> controller/evpn-binding.h | 88 ++++++++
> controller/ovn-controller.c | 203 ++++++++++++++++--
> lib/ovn-util.h | 3 +
> 5 files changed, 700 insertions(+), 12 deletions(-)
> create mode 100644 controller/evpn-binding.c
> create mode 100644 controller/evpn-binding.h
>
> diff --git a/controller/automake.mk b/controller/automake.mk
> index 37cfd4396..8d94fb646 100644
> --- a/controller/automake.mk
> +++ b/controller/automake.mk
> @@ -10,6 +10,8 @@ controller_ovn_controller_SOURCES = \
> controller/chassis.h \
> controller/encaps.c \
> controller/encaps.h \
> + controller/evpn-binding.c \
> + controller/evpn-binding.h \
> controller/ha-chassis.c \
> controller/ha-chassis.h \
> controller/if-status.c \
> diff --git a/controller/evpn-binding.c b/controller/evpn-binding.c
> new file mode 100644
> index 000000000..d57e8067d
> --- /dev/null
> +++ b/controller/evpn-binding.c
> @@ -0,0 +1,416 @@
> +/* Copyright (c) 2025, Red Hat, Inc.
> + *
> + * Licensed under the Apache License, Version 2.0 (the "License");
> + * you may not use this file except in compliance with the License.
> + * You may obtain a copy of the License at:
> + *
> + * http://www.apache.org/licenses/LICENSE-2.0
> + *
> + * Unless required by applicable law or agreed to in writing, software
> + * distributed under the License is distributed on an "AS IS" BASIS,
> + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
> + * See the License for the specific language governing permissions and
> + * limitations under the License.
> + */
> +
> +#include <config.h>
> +
> +#include "flow.h"
> +#include "local_data.h"
> +#include "neighbor-exchange.h"
> +#include "openvswitch/vlog.h"
> +#include "ovn-sb-idl.h"
> +#include "unixctl.h"
> +#include "vec.h"
> +#include "vswitch-idl.h"
> +
> +#include "evpn-binding.h"
> +
> +VLOG_DEFINE_THIS_MODULE(evpn_binding);
> +
> +static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 1);
> +
> +struct evpn_datapath {
> + uint32_t vni;
> + uint32_t dp_key;
> +};
> +
> +static struct vector collect_evpn_datapaths(
> + const struct hmap *local_datapaths);
> +static const struct evpn_datapath *evpn_datapath_find(
> + const struct vector *evpn_datapaths, uint32_t vni);
> +
> +struct evpn_tunnel {
> + uint16_t dst_port;
> + ofp_port_t ofport;
> +};
> +
> +static struct vector collect_evpn_tunnel_interfaces(
> + const struct ovsrec_bridge *br_int);
> +static const struct evpn_tunnel *evpn_tunnel_find(
> + const struct vector *evpn_tunnels, uint16_t dst_port);
> +
> +static struct evpn_binding *evpn_binding_add(
> + struct hmap *evpn_bindings, const struct evpn_remote_vtep *vtep,
> + uint32_t binding_key);
> +static uint32_t evpn_binding_hash(const struct in6_addr *remote_ip,
> + uint32_t vni);
> +static struct evpn_multicast_group *evpn_multicast_group_find(
> + const struct hmap *evpn_mc_groups, uint32_t vni);
> +static struct evpn_multicast_group *evpn_multicast_group_add(
> + struct hmap *evpn_mc_groups, uint32_t vni);
> +
> +void
> +evpn_binding_run(const struct evpn_binding_ctx_in *b_ctx_in,
> + struct evpn_binding_ctx_out *b_ctx_out)
> +{
> + struct vector datapaths =
> + collect_evpn_datapaths(b_ctx_in->local_datapaths);
> + struct vector tunnels = collect_evpn_tunnel_interfaces(b_ctx_in->br_int);
> + struct hmapx stale_bindings = HMAPX_INITIALIZER(&stale_bindings);
> + struct hmapx stale_mc_groups = HMAPX_INITIALIZER(&stale_mc_groups);
> + uint32_t hint = OVN_MIN_EVPN_KEY;
> +
> + struct evpn_binding *binding;
> + HMAP_FOR_EACH (binding, hmap_node, b_ctx_out->bindings) {
> + hmapx_add(&stale_bindings, binding);
> + }
> +
> + struct evpn_multicast_group *mc_group;
> + HMAP_FOR_EACH (mc_group, hmap_node, b_ctx_out->multicast_groups) {
> + hmapx_add(&stale_mc_groups, mc_group);
> + }
> +
> + const struct evpn_remote_vtep *vtep;
> + HMAP_FOR_EACH (vtep, hmap_node, b_ctx_in->remote_vteps) {
> + const struct evpn_tunnel *tun = evpn_tunnel_find(&tunnels,
> vtep->port);
> + if (!tun) {
> + VLOG_WARN_RL(&rl, "Couldn't find EVPN tunnel for %"PRIu16
> + " destination port.", vtep->port);
> + continue;
> + }
> +
> + const struct evpn_datapath *edp = evpn_datapath_find(&datapaths,
> + vtep->vni);
> + if (!edp) {
> + VLOG_WARN_RL(&rl, "Couldn't find EVPN datapath for %"PRIu16"
> VNI",
> + vtep->vni);
> + continue;
> + }
> +
> + binding = evpn_binding_find(b_ctx_out->bindings, &vtep->ip,
> vtep->vni);
> + if (!binding) {
> + uint32_t tunnel_key =
> + ovn_allocate_tnlid(b_ctx_out->tunnel_keys, "evpn-binding",
> + OVN_MIN_EVPN_KEY, OVN_MAX_EVPN_KEY,
> &hint);
> + if (!tunnel_key) {
> + continue;
> + }
> +
> + binding = evpn_binding_add(b_ctx_out->bindings, vtep,
> tunnel_key);
> + }
> +
> + mc_group = evpn_multicast_group_find(b_ctx_out->multicast_groups,
> + vtep->vni);
> + if (!mc_group) {
> + mc_group = evpn_multicast_group_add(b_ctx_out->multicast_groups,
> + vtep->vni);
> + }
> +
> + bool updated = false;
> + if (binding->tunnel_ofport != tun->ofport) {
> + binding->tunnel_ofport = tun->ofport;
> + updated = true;
> + }
> +
> + if (binding->dp_key != edp->dp_key) {
> + binding->dp_key = edp->dp_key;
> + updated = true;
> + }
> +
> + if (updated) {
> + hmapx_add(b_ctx_out->updated_bindings, binding);
> +
> + hmapx_add(&mc_group->bindings, binding);
> + hmapx_add(b_ctx_out->updated_multicast_groups, mc_group);
> + }
> +
> + hmapx_find_and_delete(&stale_bindings, binding);
> + hmapx_find_and_delete(&stale_mc_groups, mc_group);
> + }
> +
> + struct hmapx_node *node;
> + HMAPX_FOR_EACH (node, &stale_mc_groups) {
> + mc_group = node->data;
> +
> + uuidset_insert(b_ctx_out->removed_multicast_groups,
> + &mc_group->flow_uuid);
> + hmap_remove(b_ctx_out->multicast_groups, &mc_group->hmap_node);
> + free(mc_group);
> + }
> +
> + HMAPX_FOR_EACH (node, &stale_bindings) {
> + binding = node->data;
> +
> + mc_group = evpn_multicast_group_find(b_ctx_out->multicast_groups,
> + binding->vni);
> + if (mc_group) {
> + hmapx_find_and_delete(&mc_group->bindings, binding);
> + hmapx_add(b_ctx_out->updated_multicast_groups, mc_group);
> + }
> + uuidset_insert(b_ctx_out->removed_bindings, &binding->flow_uuid);
> + hmap_remove(b_ctx_out->bindings, &binding->hmap_node);
> + free(binding);
> + }
> +
> + vector_destroy(&datapaths);
> + vector_destroy(&tunnels);
> + hmapx_destroy(&stale_bindings);
> + hmapx_destroy(&stale_mc_groups);
> +}
> +
> +struct evpn_binding *
> +evpn_binding_find(const struct hmap *evpn_bindings,
> + const struct in6_addr *remote_ip, uint32_t vni)
> +{
> + uint32_t hash = evpn_binding_hash(remote_ip, vni);
> +
> + struct evpn_binding *binding;
> + HMAP_FOR_EACH_WITH_HASH (binding, hmap_node, hash, evpn_bindings) {
> + if (ipv6_addr_equals(&binding->remote_ip, remote_ip) &&
> + binding->vni == vni) {
> + return binding;
> + }
> + }
> +
> + return NULL;
> +}
> +
> +void
> +evpn_bindings_destroy(struct hmap *bindings)
> +{
> + struct evpn_binding *binding;
> + HMAP_FOR_EACH_POP (binding, hmap_node, bindings) {
> + free(binding);
> + }
> + hmap_destroy(bindings);
> +}
> +
> +void
> +evpn_vtep_binding_list(struct unixctl_conn *conn, int argc OVS_UNUSED,
> + const char *argv[] OVS_UNUSED, void *data_)
> +{
> + struct hmap *bindings = data_;
> + struct ds ds = DS_EMPTY_INITIALIZER;
> +
> + const struct evpn_binding *binding;
> + HMAP_FOR_EACH (binding, hmap_node, bindings) {
> + ds_put_format(&ds, "UUID: "UUID_FMT", Remote IP: ",
> + UUID_ARGS(&binding->flow_uuid));
> + ipv6_format_mapped(&binding->remote_ip, &ds);
> + ds_put_format(&ds, ", vni: %"PRIu32", binding_key: %#"PRIx32", "
> + "tunnel_ofport: %"PRIu32", dp_key: %"PRIu32,
> + binding->vni, binding->binding_key,
> + binding->tunnel_ofport, binding->dp_key);
> + ds_put_char(&ds, '\n');
> + }
> +
> + unixctl_command_reply(conn, ds_cstr_ro(&ds));
> + ds_destroy(&ds);
> +}
> +
> +void
> +evpn_multicast_groups_destroy(struct hmap *multicast_groups)
> +{
> + struct evpn_multicast_group *mc_group;
> + HMAP_FOR_EACH_POP (mc_group, hmap_node, multicast_groups) {
> + hmapx_destroy(&mc_group->bindings);
> + free(mc_group);
> + }
> + hmap_destroy(multicast_groups);
> +}
> +
> +
One too many empty lines.
> +void
> +evpn_multicast_group_list(struct unixctl_conn *conn, int argc OVS_UNUSED,
> + const char *argv[] OVS_UNUSED, void *data_)
> +{
> + struct hmap *mc_groups = data_;
> + struct ds ds = DS_EMPTY_INITIALIZER;
> +
> + const struct evpn_multicast_group *mc_group;
> + HMAP_FOR_EACH (mc_group, hmap_node, mc_groups) {
> + ds_put_format(&ds, "UUID: "UUID_FMT", Remote IPs: ",
> + UUID_ARGS(&mc_group->flow_uuid));
> +
> + struct hmapx_node *node;
> + HMAPX_FOR_EACH (node, &mc_group->bindings) {
> + const struct evpn_binding *binding = node->data;
> + ipv6_format_mapped(&binding->remote_ip, &ds);
> + ds_put_cstr(&ds, ", ");
> + }
> +
> + ds_put_format(&ds, "vni: %"PRIu32, mc_group->vni);
> + ds_put_char(&ds, '\n');
> + }
> +
> + unixctl_command_reply(conn, ds_cstr_ro(&ds));
> + ds_destroy(&ds);
> +}
> +
> +static struct vector
> +collect_evpn_datapaths(const struct hmap *local_datapaths)
> +{
> + struct vector evpn_datapaths =
> + VECTOR_EMPTY_INITIALIZER(struct evpn_datapath);
> +
> + struct local_datapath *ld;
> + HMAP_FOR_EACH (ld, hmap_node, local_datapaths) {
> + if (!ld->is_switch) {
> + continue;
> + }
> +
> + int64_t vni = ovn_smap_get_llong(&ld->datapath->external_ids,
> + "dynamic-routing-vni", -1);
> + if (!ovn_is_valid_vni(vni)) {
> + continue;
> + }
> +
> + if (evpn_datapath_find(&evpn_datapaths, vni)) {
> + VLOG_WARN_RL(&rl, "Datapath "UUID_FMT" with duplicate VNI
> %"PRIi64,
> + UUID_ARGS(&ld->datapath->header_.uuid), vni);
> + continue;
> + }
> +
> + struct evpn_datapath edp = {
> + .vni = vni,
> + .dp_key = ld->datapath->tunnel_key,
> + };
> + vector_push(&evpn_datapaths, &edp);
> + }
> +
> + return evpn_datapaths;
> +}
> +
> +static const struct evpn_datapath *
> +evpn_datapath_find(const struct vector *evpn_datapaths, uint32_t vni)
> +{
> + const struct evpn_datapath *edp;
> + VECTOR_FOR_EACH_PTR (evpn_datapaths, edp) {
> + if (edp->vni == vni) {
> + return edp;
> + }
> + }
> +
> + return NULL;
> +}
> +
> +static struct vector
> +collect_evpn_tunnel_interfaces(const struct ovsrec_bridge *br_int)
> +{
> + struct vector evpn_tunnels = VECTOR_EMPTY_INITIALIZER(struct
> evpn_tunnel);
> +
> + for (size_t i = 0; i < br_int->n_ports; i++) {
> + const struct ovsrec_port *port = br_int->ports[i];
> + if (!smap_get_bool(&port->external_ids, "ovn-evpn-tunnel", false)) {
> + continue;
> + }
> +
> + const struct ovsrec_interface *iface = port->interfaces[0];
> + if (iface->n_ofport != 1) {
> + continue;
> + }
> +
> + const char *dst_port_str =
> + smap_get_def(&iface->options, "dst_port",
> + OVS_STRINGIZE(DEFAULT_VXLAN_PORT));
> + unsigned int dst_port;
> + if (!str_to_uint(dst_port_str, 10, &dst_port)) {
> + VLOG_WARN_RL(&rl, "Couldn't parse \"dst_port\" %s for tunnel"
> + " interface %s", dst_port_str, iface->name);
> + continue;
> + }
> +
> + struct evpn_tunnel tun = {
> + .dst_port = dst_port,
> + .ofport = u16_to_ofp(iface->ofport[0]),
> + };
> + vector_push(&evpn_tunnels, &tun);
> + }
> +
> + return evpn_tunnels;
> +}
> +
> +static const struct evpn_tunnel *
> +evpn_tunnel_find(const struct vector *evpn_tunnels, uint16_t dst_port)
> +{
> + const struct evpn_tunnel *tun;
> + VECTOR_FOR_EACH_PTR (evpn_tunnels, tun) {
> + if (tun->dst_port == dst_port) {
> + return tun;
> + }
> + }
> +
> + return NULL;
> +}
> +
> +static uint32_t
> +evpn_binding_hash(const struct in6_addr *remote_ip, uint32_t vni)
> +{
> + uint32_t hash = 0;
> + hash = hash_add_in6_addr(hash, remote_ip);
> + hash = hash_add(hash, vni);
> +
> + return hash_finish(hash, 20);
> +}
> +
> +static struct evpn_binding *
> +evpn_binding_add(struct hmap *evpn_bindings,
> + const struct evpn_remote_vtep *vtep, uint32_t binding_key)
> +{
> + struct evpn_binding *binding = xmalloc(sizeof *binding);
> + *binding = (struct evpn_binding) {
> + .flow_uuid = uuid_random(),
> + .remote_ip = vtep->ip,
> + .vni = vtep->vni,
> + .binding_key = binding_key,
> + .tunnel_ofport = OFPP_NONE,
> + .dp_key = 0,
> + };
> +
> + uint32_t hash = evpn_binding_hash(&vtep->ip, vtep->vni);
> + hmap_insert(evpn_bindings, &binding->hmap_node, hash);
> +
> + return binding;
> +}
> +
> +static struct evpn_multicast_group *
> +evpn_multicast_group_find(const struct hmap *evpn_mc_groups, uint32_t vni)
> +{
> + uint32_t hash = hash_int(vni, 4);
> +
> + struct evpn_multicast_group *mc_group;
> + HMAP_FOR_EACH_WITH_HASH (mc_group, hmap_node, hash, evpn_mc_groups) {
> + if (mc_group->vni == vni) {
> + return mc_group;
> + }
> + }
> +
> + return NULL;
> +}
> +
> +static struct evpn_multicast_group *
> +evpn_multicast_group_add(struct hmap *evpn_mc_groups, uint32_t vni)
> +{
> + struct evpn_multicast_group *mc_group = xmalloc(sizeof *mc_group);
> + *mc_group = (struct evpn_multicast_group) {
> + .flow_uuid = uuid_random(),
> + .bindings = HMAPX_INITIALIZER(&mc_group->bindings),
> + .vni = vni,
> + };
> +
> + uint32_t hash = hash_int(vni, 4);
> + hmap_insert(evpn_mc_groups, &mc_group->hmap_node, hash);
> +
> + return mc_group;
> +}
> diff --git a/controller/evpn-binding.h b/controller/evpn-binding.h
> new file mode 100644
> index 000000000..229d29b09
> --- /dev/null
> +++ b/controller/evpn-binding.h
> @@ -0,0 +1,88 @@
> +/* Copyright (c) 2025, Red Hat, Inc.
> + *
> + * Licensed under the Apache License, Version 2.0 (the "License");
> + * you may not use this file except in compliance with the License.
> + * You may obtain a copy of the License at:
> + *
> + * http://www.apache.org/licenses/LICENSE-2.0
> + *
> + * Unless required by applicable law or agreed to in writing, software
> + * distributed under the License is distributed on an "AS IS" BASIS,
> + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
> + * See the License for the specific language governing permissions and
> + * limitations under the License.
> + */
> +
> +#ifndef EVPN_BINDING_H
> +#define EVPN_BINDING_H 1
> +
> +#include <stdint.h>
> +
> +#include "hmapx.h"
> +#include "openvswitch/hmap.h"
> +#include "uuidset.h"
> +
> +struct ovsrec_bridge;
> +struct unixctl_conn;
> +
> +struct evpn_binding_ctx_in {
> + const struct ovsrec_bridge *br_int;
> + /* Contains 'struct local_datapath'. */
> + const struct hmap *local_datapaths;
> + /* Contains 'struct evpn_remote_vtep'. */
> + const struct hmap *remote_vteps;
> +};
> +
> +struct evpn_binding_ctx_out {
> + /* Contains 'struct evpn_binding'. */
> + struct hmap *bindings;
> + /* Contains pointers to 'struct evpn_binding'. */
> + struct hmapx *updated_bindings;
> + /* Contains 'flow_uuid' from removed 'struct evpn_binding'. */
> + struct uuidset *removed_bindings;
> + /* Contains 'struct evpn_multicast_group'. */
> + struct hmap *multicast_groups;
> + /* Contains pointers to 'struct evpn_multicast_group'. */
> + struct hmapx *updated_multicast_groups;
> + /* Contains 'flow_uuid' from removed 'struct evpn_multicast_group'. */
> + struct uuidset *removed_multicast_groups;
> + /* Contains 'struct tnlid_node". */
> + struct hmap *tunnel_keys;
> +};
> +
> +struct evpn_binding {
> + struct hmap_node hmap_node;
> + /* UUID used to identify physical flows related to this binding. */
> + struct uuid flow_uuid;
> + /* IP address of the remote VTEP. */
> + struct in6_addr remote_ip;
> + uint32_t vni;
> + /* Local tunnel key to identify the binding. */
> + uint32_t binding_key;
> +
> + ofp_port_t tunnel_ofport;
> + uint32_t dp_key;
> +};
> +
> +struct evpn_multicast_group {
> + struct hmap_node hmap_node;
> + /* UUID used to identify physical flows related to this mutlicast group.
> */
> + struct uuid flow_uuid;
> + /* Contains pointers to 'struct evpn_bindings'. */
> + struct hmapx bindings;
> + uint32_t vni;
> +};
> +
> +void evpn_binding_run(const struct evpn_binding_ctx_in *,
> + struct evpn_binding_ctx_out *);
> +struct evpn_binding *evpn_binding_find(const struct hmap *evpn_bindings,
> + const struct in6_addr *remote_ip,
> + uint32_t vni);
> +void evpn_bindings_destroy(struct hmap *bindings);
> +void evpn_vtep_binding_list(struct unixctl_conn *conn, int argc,
> + const char *argv[], void *data_);
> +void evpn_multicast_groups_destroy(struct hmap *multicast_groups);
> +void evpn_multicast_group_list(struct unixctl_conn *conn, int argc,
> + const char *argv[], void *data_);
> +
> +#endif /* EVPN_BINDING_H */
> diff --git a/controller/ovn-controller.c b/controller/ovn-controller.c
> index fc9181f88..e22cffb2d 100644
> --- a/controller/ovn-controller.c
> +++ b/controller/ovn-controller.c
> @@ -98,6 +98,7 @@
> #include "neighbor.h"
> #include "neighbor-exchange.h"
> #include "neighbor-table-notify.h"
> +#include "evpn-binding.h"
>
> VLOG_DEFINE_THIS_MODULE(main);
>
> @@ -4558,6 +4559,23 @@ parse_encap_ips(const struct ovsrec_open_vswitch_table
> *ovs_table,
> }
> }
>
> +struct ed_type_evpn_vtep_binding {
> + /* Contains 'struct evpn_binding'. */
> + struct hmap bindings;
> + /* Contains pointers to 'struct evpn_binding'. */
> + struct hmapx updated_bindings;
> + /* Contains 'flow_uuid' from removed 'struct evpn_binding'. */
> + struct uuidset removed_bindings;
> + /* Contains 'struct evpn_multicast_group'. */
> + struct hmap multicast_groups;
> + /* Contains pointers to 'struct evpn_multicast_group'. */
> + struct hmapx updated_multicast_groups;
> + /* Contains 'flow_uuid' from removed 'struct evpn_multicast_group'. */
> + struct uuidset removed_multicast_groups;
> + /* Contains 'struct tnlid_node". */
> + struct hmap tunnel_keys;
> +};
> +
> static void init_physical_ctx(struct engine_node *node,
> struct ed_type_runtime_data *rt_data,
> struct ed_type_non_vif_data *non_vif_data,
> @@ -4988,14 +5006,6 @@ controller_output_garp_rarp_handler(struct engine_node
> *node OVS_UNUSED,
> return EN_HANDLED_UPDATED;
> }
>
> -static enum engine_input_handler_result
> -controller_output_neighbor_exchange_handler(
> - struct engine_node *node OVS_UNUSED,
> - void *data OVS_UNUSED)
> -{
> - return EN_HANDLED_UPDATED;
> -}
> -
> /* Handles sbrec_chassis changes.
> * If a new chassis is added or removed return false, so that
> * flows are recomputed. For any updates, there is no need for
> @@ -5767,7 +5777,7 @@ neighbor_runtime_data_handler(struct engine_node *node,
> void *data OVS_UNUSED)
> HMAP_FOR_EACH (tdp, node, &rt_data->tracked_dp_bindings) {
> struct local_datapath *ld =
> get_local_datapath(&rt_data->local_datapaths,
> tdp->dp->tunnel_key);
> - if (!ld) {
> + if (!ld || !ld->is_switch) {
This should've been done in the patch #5, IIUC.
Best regards, Ilya Maximets.
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