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authorNeale Ranns <nranns@cisco.com>2017-07-15 07:37:25 -0700
committerDamjan Marion <dmarion.lists@gmail.com>2017-07-18 20:46:29 +0000
commit57b5860f013953ce161d05302e05370db9cd6ee2 (patch)
tree2d4cdbbc631848be4c43c599698019b2121e000b /src/vnet/fib/fib_entry_src.c
parent51822bf07a3f0fe72834ea94659faf6e262475ba (diff)
FIB path preference
Paths are given a preference, lowest value is 'best'. Only paths that are up are up contribute to fprwarding - that's unchanged. What's new is that of the path's that re up only those that have the best preference contribute. A poor man's primary and backup. It's not true primary/backup function because the FIB must converge before the lower preference paths are used. Change-Id: Ie4453c4a7b1094c6c2b51fe1594b8302103bb68e Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/fib/fib_entry_src.c')
-rw-r--r--src/vnet/fib/fib_entry_src.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/vnet/fib/fib_entry_src.c b/src/vnet/fib/fib_entry_src.c
index 8c5082846a8..ff73cbf90f1 100644
--- a/src/vnet/fib/fib_entry_src.c
+++ b/src/vnet/fib/fib_entry_src.c
@@ -193,6 +193,7 @@ typedef struct fib_entry_src_collect_forwarding_ctx_t_
const fib_entry_src_t *esrc;
fib_forward_chain_type_t fct;
int n_recursive_constrained;
+ u16 preference;
} fib_entry_src_collect_forwarding_ctx_t;
/**
@@ -351,6 +352,22 @@ fib_entry_src_collect_forwarding (fib_node_index_t pl_index,
{
ctx->n_recursive_constrained += 1;
}
+ if (0xffff == ctx->preference)
+ {
+ /*
+ * not set a preference yet, so the first path we encounter
+ * sets the preference we are collecting.
+ */
+ ctx->preference = fib_path_get_preference(path_index);
+ }
+ else if (ctx->preference != fib_path_get_preference(path_index))
+ {
+ /*
+ * this path does not belong to the same preference as the
+ * previous paths encountered. we are done now.
+ */
+ return (FIB_PATH_LIST_WALK_STOP);
+ }
/*
* get the matching path-extension for the path being visited.
@@ -422,6 +439,7 @@ fib_entry_src_mk_lb (fib_entry_t *fib_entry,
.next_hops = NULL,
.n_recursive_constrained = 0,
.fct = fct,
+ .preference = 0xffff,
};
/*