From 88fc83eb716bf07f4634de6de5b569f795a56418 Mon Sep 17 00:00:00 2001 From: Neale Ranns Date: Wed, 5 Apr 2017 08:11:14 -0700 Subject: BFD-FIB interactions - single-hop BFD: attach a delegate to the appropriate adjacency - multi-hop BFD [not supported yet]: attach a delegate to the FIB entry. adjacency/fib_entry state tracks the BFD session state. when the state is down the object does not contribute forwarding hence and hence dependent objects will not use it. For example, if a route is ECMP via two adjacencies and one of them is BFD down, then only the other is used to forward (i.e. we don't drop half the traffic). Change-Id: I0ef53e20e73b067001a132cd0a3045408811a822 Signed-off-by: Neale Ranns --- src/vnet/adj/adj_delegate.h | 104 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 104 insertions(+) create mode 100644 src/vnet/adj/adj_delegate.h (limited to 'src/vnet/adj/adj_delegate.h') diff --git a/src/vnet/adj/adj_delegate.h b/src/vnet/adj/adj_delegate.h new file mode 100644 index 00000000..17651203 --- /dev/null +++ b/src/vnet/adj/adj_delegate.h @@ -0,0 +1,104 @@ +/* + * Copyright (c) 2016 Cisco and/or its affiliates. + * 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 __ADJ_DELEGATE_T__ +#define __ADJ_DELEGATE_T__ + +#include + +/** + * Delegate types + */ +typedef enum adj_delegate_type_t_ { + /** + * BFD session state + */ + ADJ_DELEGATE_BFD, +} adj_delegate_type_t; + +#define FOR_EACH_ADJ_DELEGATE(_adj, _adt, _aed, _body) \ +{ \ + for (_adt = ADJ_DELEGATE_BFD; \ + _adt <= ADJ_DELEGATE_BFD; \ + _adt++) \ + { \ + _aed = adj_delegate_get(_adj, _adt); \ + if (NULL != _aed) { \ + _body; \ + } \ + } \ +} + +/** + * Distillation of the BFD session states into a go/no-go for using + * the associated tracked adjacency + */ +typedef enum adj_bfd_state_t_ +{ + ADJ_BFD_STATE_DOWN, + ADJ_BFD_STATE_UP, +} adj_bfd_state_t; + +/** + * A Delagate is a means to implement the Delagation design pattern; + * the extension of an object's functionality through the composition of, + * and delgation to, other objects. + * These 'other' objects are delegates. Delagates are thus attached to + * ADJ objects to extend their functionality. + */ +typedef struct adj_delegate_t_ +{ + /** + * The ADJ entry object to which the delagate is attached + */ + adj_index_t ad_adj_index; + + /** + * The delagate type + */ + adj_delegate_type_t ad_type; + + /** + * A union of data for the different delegate types + */ + union + { + /** + * BFD delegate daa + */ + struct { + /** + * BFD session state + */ + adj_bfd_state_t ad_bfd_state; + /** + * BFD session index + */ + u32 ad_bfd_index; + }; + }; +} adj_delegate_t; + +extern void adj_delegate_remove(ip_adjacency_t *adj, + adj_delegate_type_t type); + +extern adj_delegate_t *adj_delegate_find_or_add(ip_adjacency_t *adj, + adj_delegate_type_t fdt); +extern adj_delegate_t *adj_delegate_get(const ip_adjacency_t *adj, + adj_delegate_type_t type); + +extern u8 *format_adj_deletegate(u8 * s, va_list * args); + +#endif -- cgit 1.2.3-korg