diff options
| author | Trey Aspelund <taspelund@nvidia.com> | 2023-01-31 14:36:45 -0500 |
|---|---|---|
| committer | Trey Aspelund <taspelund@nvidia.com> | 2023-05-30 15:20:35 +0000 |
| commit | 56fe240061ea63dfab41b3544248f51099323f91 (patch) | |
| tree | 1789bda9538aa766a8832ee10ac133d0f333c6c0 /bgpd/bgp_mac.c | |
| parent | 63e04998a7a12ee203fa4aeea205e3b9671bf995 (diff) | |
bgpd: only rescan EVPN tables if self-mac changes
When processing an interface up/create event from zebra, we insert that
interface's MAC address into the self_mac_hash used for dropping EVPN
routes carrying a 'self mac' (RMAC ext-comm or MAC in Type-2 NLRI).
However, we were unconditionally triggering a "rescan" of the EVPN RIB
to ensure we handle routes that match the MAC - even if the MAC already
existed in self_mac_hash (i.e. the change wasn't actionable).
This adds logic to only kick off a "rescan" if the MAC learned from
zebra is not already in the self_mac_hash.
Signed-off-by: Trey Aspelund <taspelund@nvidia.com>
Diffstat (limited to 'bgpd/bgp_mac.c')
| -rw-r--r-- | bgpd/bgp_mac.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/bgpd/bgp_mac.c b/bgpd/bgp_mac.c index 6272bdb884..0398e4e8c1 100644 --- a/bgpd/bgp_mac.c +++ b/bgpd/bgp_mac.c @@ -279,15 +279,29 @@ static void bgp_mac_remove_ifp_internal(struct bgp_self_mac *bsm, char *ifname, } } +/* Add/Update entry of the 'bgp mac hash' table. + * A rescan of the EVPN tables is only needed if + * a new hash bucket is allocated. + * Learning an existing mac on a new interface (or + * having an existing mac move from one interface to + * another) does not result in changes to self mac + * state, so we shouldn't trigger a rescan. + */ void bgp_mac_add_mac_entry(struct interface *ifp) { struct bgp_self_mac lookup; struct bgp_self_mac *bsm; struct bgp_self_mac *old_bsm; char *ifname; + bool mac_added = false; memcpy(&lookup.macaddr, &ifp->hw_addr, ETH_ALEN); - bsm = hash_get(bm->self_mac_hash, &lookup, bgp_mac_hash_alloc); + bsm = hash_lookup(bm->self_mac_hash, &lookup); + if (!bsm) { + bsm = hash_get(bm->self_mac_hash, &lookup, bgp_mac_hash_alloc); + /* mac is new, rescan needs to be triggered */ + mac_added = true; + } /* * Does this happen to be a move @@ -318,7 +332,8 @@ void bgp_mac_add_mac_entry(struct interface *ifp) listnode_add(bsm->ifp_list, ifname); } - bgp_mac_rescan_all_evpn_tables(&bsm->macaddr); + if (mac_added) + bgp_mac_rescan_all_evpn_tables(&bsm->macaddr); } void bgp_mac_del_mac_entry(struct interface *ifp) |