X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fadj%2Fadj_midchain.h;h=5fb0ee8efb3334942dde0de29a213bcdb2c50ab1;hb=a91cb4590;hp=65892314f409a8edb03b43556da17b814642ee92;hpb=db14f5aff69311d13a0a90baa3567e92f3faa783;p=vpp.git

diff --git a/src/vnet/adj/adj_midchain.h b/src/vnet/adj/adj_midchain.h
index 65892314f40..5fb0ee8efb3 100644
--- a/src/vnet/adj/adj_midchain.h
+++ b/src/vnet/adj/adj_midchain.h
@@ -50,10 +50,32 @@ extern void adj_nbr_midchain_update_rewrite(adj_index_t adj_index,
 					    adj_flags_t flags,
 					    u8 *rewrite);
 
+/**
+ * @brief
+ *  Return the adjacency's next node to its default value
+ *
+ * @param adj_index
+ *  The index of the neighbour adjacency.
+ */
+extern void adj_nbr_midchain_reset_next_node(adj_index_t adj_index);
+
+/**
+ * @brief
+ *  Update the VLIB node to which packets are sent post processing
+ *
+ * @param adj_index
+ *  The index of the neighbour adjacency.
+ *
+ * @param node node-index to send to
+ */
+extern void adj_nbr_midchain_update_next_node(adj_index_t adj_index,
+                                              u32 node_index);
+
 /**
  * @brief
  *  [re]stack a midchain. 'Stacking' is the act of forming parent-child
- *  relationships in the data-plane graph.
+ *  relationships in the data-plane graph. Do NOT use this function to
+ *  stack on a DPO type that might form a loop.
  *
  * @param adj_index
  *  The index of the midchain to stack
@@ -64,6 +86,25 @@ extern void adj_nbr_midchain_update_rewrite(adj_index_t adj_index,
 extern void adj_nbr_midchain_stack(adj_index_t adj_index,
 				   const dpo_id_t *dpo);
 
+/**
+ * @brief
+ *  [re]stack a midchain. 'Stacking' is the act of forming parent-child
+ *  relationships in the data-plane graph. Since function performs recursive
+ *  loop detection.
+ *
+ * @param adj_index
+ *  The index of the midchain to stack
+ *
+ * @param fei
+ *  The FIB entry to stack on
+ *
+ * @param fct
+ *  The chain type to use from the fib entry fowarding
+ */
+extern void adj_nbr_midchain_stack_on_fib_entry(adj_index_t adj_index,
+                                                fib_node_index_t fei,
+                                                fib_forward_chain_type_t fct);
+
 /**
  * @brief
  *  unstack a midchain. This will break the chain between the midchain and
@@ -74,6 +115,18 @@ extern void adj_nbr_midchain_stack(adj_index_t adj_index,
  */
 extern void adj_nbr_midchain_unstack(adj_index_t adj_index);
 
+/**
+ * @brief descend the FIB graph looking for loops
+ *
+ * @param ai
+ *  The adj index to traverse
+ *
+ * @param entry_indicies)
+ *  A pointer to a vector of FIB entries already visited.
+ */
+extern int adj_ndr_midchain_recursive_loop_detect(adj_index_t ai,
+                                                  fib_node_index_t **entry_indicies);
+
 /**
  * @brief
  *  Module initialisation
@@ -86,4 +139,27 @@ extern void adj_midchain_module_init(void);
  */
 extern u8* format_adj_midchain(u8* s, va_list *ap);
 
+/**
+ * @brief
+ *  create/attach a midchain delegate and stack it on the prefix passed
+ * @param ai - the index of the adjacency to stack
+ * @param fib_index - The FIB index of the prefix on which to stack
+ * @param pfx - The prefix on which to stack
+ */
+extern void adj_midchain_delegate_stack(adj_index_t ai,
+                                        u32 fib_index,
+                                        const fib_prefix_t *pfx);
+
+/**
+ * @brief restack a midchain delegate
+ */
+extern void adj_midchain_delegate_restack(adj_index_t ai);
+
+/**
+ * @brief unstack a midchain delegate (this stacks it on a drop)
+ */
+extern void adj_midchain_delegate_unstack(adj_index_t ai);
+
+extern u8 adj_is_midchain (adj_index_t ai);
+
 #endif