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authorNeale Ranns <nranns@cisco.com>2020-11-09 10:09:42 +0000
committerFlorin Coras <florin.coras@gmail.com>2021-01-14 19:55:55 +0000
commitdfd3954c0427422e2739b858d1e18503a5c59970 (patch)
tree13225967f028f7d386b8da863656b5e576c0b463 /src/vnet
parent1b5ca985dc51bea730ce5ee799641c75f73a0f26 (diff)
docs: Update FIB documentation
Type: docs Signed-off-by: Neale Ranns <nranns@cisco.com> Change-Id: I3dfde4520a48c945ca9707accabbe1735c1a8799
Diffstat (limited to 'src/vnet')
-rw-r--r--src/vnet/fib/fib_source.h23
1 files changed, 17 insertions, 6 deletions
diff --git a/src/vnet/fib/fib_source.h b/src/vnet/fib/fib_source.h
index 198ef194e2b..f4063a7819c 100644
--- a/src/vnet/fib/fib_source.h
+++ b/src/vnet/fib/fib_source.h
@@ -20,8 +20,11 @@
/**
* The different sources that can create a route.
- * The sources are defined here with their relative priority order.
- * The lower the value the higher the priority
+ *
+ * A source is a combination of two concepts; priority and behaviour.
+ * Priority determines whether the source is contributing forwarding.
+ * Behaviour determines how FIB entries with this source interact with
+ * other elements of FIB.
*/
typedef enum fib_source_t_ {
/**
@@ -171,7 +174,7 @@ STATIC_ASSERT (sizeof(fib_source_t) == 1,
}
/**
- * Each source is assigned a priority. lower priority is beeter.
+ * Each source is assigned a priority. lower priority is better.
* the source with the best source with have its contribution added
* to forwarding. the lesser sources will be 'remembered' by FIB and
* added to forwarding should the best source be removed.
@@ -190,12 +193,14 @@ typedef enum fib_source_priority_cmp_t_
/**
* Each source has a defined behaviour that controls how entries
- * behave that have that source
+ * behave that have that source.
+ * Sources with non-default behaviour may have a private data area
+ * in the fib_entry_src_t union.
*/
typedef enum fib_source_behaviour_t_
{
/**
- * If your adding a new source from a plugin pick one of these
+ * If you're adding a new source from a plugin pick one of these
*/
/** Default behaviour - always install a drop */
FIB_SOURCE_BH_DROP,
@@ -216,7 +221,13 @@ typedef enum fib_source_behaviour_t_
FIB_SOURCE_BH_INTERFACE,
/** interpose */
FIB_SOURCE_BH_INTERPOSE,
- /** simple + source fib tracking */
+ /**
+ * simple behaviour, plus the source specific data stores the
+ * FIB index that is used for subsequent lookups using the
+ * packet's source address.
+ * This doesn't need to be a LISP specific source, it's just
+ * 'simple' behaviour with a u32 stored in the source specific data.
+ */
FIB_SOURCE_BH_LISP,
/** adj w/ cover tracking + refinement */
FIB_SOURCE_BH_ADJ,