stats: counters data model

This adds a new data model for counters.
Specifying the errors severity and unit.
A later patch will update vpp_get_stats to take advantage of this.
Only the map plugin is updates as an example.

New .api language:
A new "counters" keyword to define counter sets.

counters map {
  none {
    severity info;
    type counter64;
    units "packets";
    description "valid MAP packets";
  };
  bad_protocol {
    severity error;
    type counter64;
    units "packets";
    description "bad protocol";
  };
};

Each counter has 4 keywords. severity, which is one of error, info or warn.
A type, which is one of counter64 or gauge64.
units, which is a text field using units from YANG.

paths {
  "/err/ip4-map" "map";
  "/err/ip6-map" "map";
  "/err/ip4-t-map" "map";
  "/err/ip6-t-map" "map";
};

A new paths keyword that maps the counter-set to a path in the stats segment KV store.

Updated VPP CLI to include severity so user can see error counter severity.
DBGvpp# show errors
   Count               Node                    Reason        Severity
        13        ethernet-input              no error         error

Type: feature
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: Ib2177543f49d4c3aef4d7fa72476cff2068f7771
Signed-off-by: Ole Troan <ot@cisco.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/tools/vppapigen/vppapigen_json.py b/src/tools/vppapigen/vppapigen_json.py
index 6e7aaa2e6f5..f41bfb08c58 100644
--- a/src/tools/vppapigen/vppapigen_json.py
+++ b/src/tools/vppapigen/vppapigen_json.py
@@ -1,6 +1,7 @@
 # JSON generation
 import json
 
+
 def walk_imports(s):
     r = []
     for e in s:
@@ -8,6 +9,19 @@ def walk_imports(s):
     return r
 
 
+def walk_counters(s, pathset):
+    r = []
+    for e in s:
+        r2 = {'name': e.name, 'elements': e.block}
+        r.append(r2)
+
+    r3 = []
+    for p in pathset:
+        r3.append(p.paths)
+
+    return r, r3
+
+
 def walk_enums(s):
     r = []
     for e in s:
@@ -66,6 +80,7 @@ def walk_defs(s, is_message=False):
         r.append(d)
     return r
 
+
 #
 # Plugin entry point
 #
@@ -84,4 +99,5 @@ def run(args, filename, s):
     j['aliases'] = {o.name:o.alias for o in s['types'] if o.__class__.__name__ == 'Using'}
     j['vl_api_version'] = hex(s['file_crc'])
     j['imports'] = walk_imports(i for i in s['Import'])
+    j['counters'], j['paths'] = walk_counters(s['Counters'], s['Paths'])
     return json.dumps(j, indent=4, separators=(',', ': '))