zebra: Ethernet segment management and support for MAC-ECMP

1. Local ethernet segments are configured in zebra by attaching a
local-es-id and sys-mac to a access interface -
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
!
interface hostbond1
 evpn mh es-id 1
 evpn mh es-sys-mac 00:00:00:00:01:11
!
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
This info is then sent to BGP and used for the generation of EAD-per-ES
routes.

2. Access VLANs associated with an (ES) access port are translated into
ES-EVI objects and sent to BGP. This is used by BGP for the
generation of EAD-EVI routes.

3. Remote ESs are imported by BGP and sent to zebra. A list of VTEPs
is maintained per-remote ES in zebra. This list is used for the creation
of the L2-NHG that is used for forwarding traffic.

4. MAC entries with a non-zero ESI destination use the L2-NHG associated
with the ESI for forwarding traffic over the VxLAN overlay.

Please see zebra_evpn_mh.h for the datastruct organization details.

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/zebra/zebra_vxlan_private.h b/zebra/zebra_vxlan_private.h
index 806611c50e..a9f62fde10 100644
--- a/zebra/zebra_vxlan_private.h
+++ b/zebra/zebra_vxlan_private.h
@@ -62,6 +62,9 @@ struct zebra_vtep_t_ {
 	struct zebra_vtep_t_ *prev;
 };
 
+RB_HEAD(zebra_es_evi_rb_head, zebra_evpn_es_evi);
+RB_PROTOTYPE(zebra_es_evi_rb_head, zebra_evpn_es_evi, rb_node,
+		zebra_es_evi_rb_cmp);
 
 /*
  * VNI hash table
@@ -73,6 +76,10 @@ struct zebra_vni_t_ {
 	/* VNI - key */
 	vni_t vni;
 
+	/* ES flags */
+	uint32_t flags;
+#define ZVNI_READY_FOR_BGP (1 << 0) /* ready to be sent to BGP */
+
 	/* Flag for advertising gw macip */
 	uint8_t advertise_gw_macip;
 
@@ -102,6 +109,12 @@ struct zebra_vni_t_ {
 
 	/* List of local or remote neighbors (MAC+IP) */
 	struct hash *neigh_table;
+
+	/* RB tree of ES-EVIs */
+	struct zebra_es_evi_rb_head es_evi_rb_tree;
+
+	/* List of local ESs */
+	struct list *local_es_evi_list;
 };
 
 /* L3 VNI hash table */
@@ -316,6 +329,9 @@ struct zebra_mac_t_ {
 		struct in_addr r_vtep_ip;
 	} fwd_info;
 
+	/* Local or remote ES */
+	struct zebra_evpn_es *es;
+
 	/* Mobility sequence numbers associated with this entry. */
 	uint32_t rem_seq;
 	uint32_t loc_seq;
@@ -391,6 +407,9 @@ struct zebra_neigh_t_ {
 	/* MAC address. */
 	struct ethaddr emac;
 
+	/* Back pointer to MAC. Only applicable to hosts in a L2-VNI. */
+	zebra_mac_t *mac;
+
 	/* Underlying interface. */
 	ifindex_t ifindex;
 
@@ -507,4 +526,6 @@ typedef struct zebra_vxlan_sg_ {
 	uint32_t ref_cnt;
 } zebra_vxlan_sg_t;
 
+extern zebra_vni_t *zvni_lookup(vni_t vni);
+
 #endif /* _ZEBRA_VXLAN_PRIVATE_H */