fib: Table Replace

Type: feature

from the API doc, a table replace is:

"
    The use-case is that, for some unspecified reason, the control plane
    has a very different set of entries it wants in the table than VPP
    currently has. The CP would thus like to 'replace' VPP's current table
    only by specifying what the new set of entries shall be, i.e. it is not
    going to delete anything that already eixts.
    the CP delcartes the start of this procedure with this begin_replace
    API Call, and when it has populated all the entries it wants, it calls
    the below end_replace API. From this point on it is of coursce free
    to add and delete entries as usual.
    The underlying mechanism by which VPP implements this replace is
    purposefully left unspecified.
"

In the FIB, the algorithm is implemented using mark and sweep.

Algorithm goes:
1) replace_begin: this marks all the entries in that table as 'stale'
2) download all the entries that should be in this table
 - this clears the stale flag on those entries
3) signal the table converged: ip_table_replace_end
 - this removes all entries that are still stale

this procedure can be used when an agent first connects to VPP,
as an alternative to dump and diff state reconciliation.

Change-Id: I168edec10cf7670866076b129ebfe6149ea8222e
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 95 insertions, 1 deletions

diff --git a/src/vnet/fib/fib_table.c b/src/vnet/fib/fib_table.c
index 3778fa9a944..d3cf5dc88b1 100644
--- a/src/vnet/fib/fib_table.c
+++ b/src/vnet/fib/fib_table.c
@@ -23,6 +23,8 @@
 #include <vnet/fib/ip6_fib.h>
 #include <vnet/fib/mpls_fib.h>
 
+const static char * fib_table_flags_strings[] = FIB_TABLE_ATTRIBUTES;
+
 fib_table_t *
 fib_table_get (fib_node_index_t index,
 	       fib_protocol_t proto)
@@ -1305,6 +1307,26 @@ format_fib_table_name (u8* s, va_list* ap)
     return (s);
 }
 
+u8*
+format_fib_table_flags (u8 *s, va_list *args)
+{
+    fib_table_flags_t flags = va_arg(*args, int);
+    fib_table_attribute_t attr;
+
+    if (!flags)
+    {
+        return format(s, "none");
+    }
+
+    FOR_EACH_FIB_TABLE_ATTRIBUTE(attr) {
+        if (1 << attr & flags) {
+            s = format(s, "%s", fib_table_flags_strings[attr]);
+        }
+    }
+
+    return (s);
+}
+
 /**
  * @brief Table flush context. Store the indicies of matching FIB entries
  * that need to be removed.
@@ -1335,7 +1357,6 @@ fib_table_flush_cb (fib_node_index_t fib_entry_index,
     return (FIB_TABLE_WALK_CONTINUE);
 }
 
-
 void
 fib_table_flush (u32 fib_index,
 		 fib_protocol_t proto,
@@ -1359,6 +1380,79 @@ fib_table_flush (u32 fib_index,
     vec_free(ctx.ftf_entries);
 }
 
+static fib_table_walk_rc_t
+fib_table_mark_cb (fib_node_index_t fib_entry_index,
+                   void *arg)
+{
+    fib_table_flush_ctx_t *ctx = arg;
+
+    if (fib_entry_is_sourced(fib_entry_index, ctx->ftf_source))
+    {
+        fib_entry_mark(fib_entry_index, ctx->ftf_source);
+    }
+    return (FIB_TABLE_WALK_CONTINUE);
+}
+
+void
+fib_table_mark (u32 fib_index,
+                fib_protocol_t proto,
+                fib_source_t source)
+{
+    fib_table_flush_ctx_t ctx = {
+        .ftf_source = source,
+    };
+    fib_table_t *fib_table;
+
+    fib_table = fib_table_get(fib_index, proto);
+
+    fib_table->ft_epoch++;
+    fib_table->ft_flags |= FIB_TABLE_FLAG_RESYNC;
+
+    fib_table_walk(fib_index, proto,
+                   fib_table_mark_cb,
+                   &ctx);
+}
+
+static fib_table_walk_rc_t
+fib_table_sweep_cb (fib_node_index_t fib_entry_index,
+                    void *arg)
+{
+    fib_table_flush_ctx_t *ctx = arg;
+
+    if (fib_entry_is_marked(fib_entry_index, ctx->ftf_source))
+    {
+        vec_add1(ctx->ftf_entries, fib_entry_index);
+    }
+    return (FIB_TABLE_WALK_CONTINUE);
+}
+
+void
+fib_table_sweep (u32 fib_index,
+                 fib_protocol_t proto,
+                 fib_source_t source)
+{
+    fib_table_flush_ctx_t ctx = {
+        .ftf_source = source,
+    };
+    fib_node_index_t *fib_entry_index;
+    fib_table_t *fib_table;
+
+    fib_table = fib_table_get(fib_index, proto);
+
+    fib_table->ft_flags &= ~FIB_TABLE_FLAG_RESYNC;
+
+    fib_table_walk(fib_index, proto,
+                   fib_table_sweep_cb,
+                   &ctx);
+
+    vec_foreach(fib_entry_index, ctx.ftf_entries)
+    {
+        fib_table_entry_delete_index(*fib_entry_index, source);
+    }
+
+    vec_free(ctx.ftf_entries);
+}
+
 u8 *
 format_fib_table_memory (u8 *s, va_list *args)
 {