zebra: Install directly connected route after interface flap

Issue:
After vlan flap, zebra was not marking the selected/best route as installed.

As a result, when a static route was configured with nexthop as directly
connected interface's(vlan) IP, the static route was not being installed
in the kernel since its nexthop was unresolved. The nexthop was marked
unresolved because zebra failed to mark the best route as installed after
interface flap.

This was happening because, in dplane_route_update_internal() if the old and
new context type, and nexthop group id are the same, then zebra doesn't send
down a route replace request to kernel. But, the installed (ROUTE_ENTRY_INSTALLED)
flag is set when zebra receives a response from kernel. Since the
request to kernel was being skipped for the route entry, installed flag
was not being set

Fix:
In dplane_route_update_internal() if the old and new context type, and
nexthop group id are the same, then before returning, installed flag will
be set on the route-entry if it's not set already.

Signed-off-by: Pooja Jagadeesh Doijode <pdoijode@nvidia.com>

diff --git a/zebra/zebra_dplane.c b/zebra/zebra_dplane.c
index fb1ebc682737d76fcf7e0a27006ebc9b95c69409..4a4fcd2df22c2de42f6bcaf27ac6fc37e34efd62 100644 (file)
--- a/zebra/zebra_dplane.c
+++ b/zebra/zebra_dplane.c
@@ -3745,6 +3745,11 @@ dplane_route_update_internal(struct route_node *rn,
                                                 NEXTHOP_FLAG_FIB);
                        }
 
+                       if ((op == DPLANE_OP_ROUTE_UPDATE) && old_re && re &&
+                           (old_re != re) &&
+                           !CHECK_FLAG(re->status, ROUTE_ENTRY_INSTALLED))
+                               SET_FLAG(re->status, ROUTE_ENTRY_INSTALLED);
+
                        dplane_ctx_free(&ctx);
                        return ZEBRA_DPLANE_REQUEST_SUCCESS;
                }