stats: python vpp_stats rewrite to access stat segment directly

This module implement Python access to the VPP statistics segment. It
accesses the data structures directly in shared memory.
VPP uses optimistic locking, so data structures may change underneath
us while we are reading. Data is copied out and it's important to
spend as little time as possible "holding the lock".

Counters are stored in VPP as a two dimensional array.
Index by thread and index (typically sw_if_index).
Simple counters count only packets, Combined counters count packets
and octets.

Counters can be accessed in either dimension.
stat['/if/rx'] - returns 2D lists
stat['/if/rx'][0] - returns counters for all interfaces for thread 0
stat['/if/rx'][0][1] - returns counter for interface 1 on thread 0
stat['/if/rx'][0][1]['packets'] - returns the packet counter
                                  for interface 1 on thread 0
stat['/if/rx'][:, 1] - returns the counters for interface 1 on all threads
stat['/if/rx'][:, 1].packets() - returns the packet counters for
                                 interface 1 on all threads
stat['/if/rx'][:, 1].sum_packets() - returns the sum of packet counters for
                                     interface 1 on all threads
stat['/if/rx-miss'][:, 1].sum() - returns the sum of packet counters for
                                  interface 1 on all threads for simple counters

Type: refactor
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: I1fe7f7c7d11378d06be8276db5e1900ecdb8f515
Signed-off-by: Ole Troan <ot@cisco.com>

1 files changed, 48 insertions, 96 deletions

diff --git a/test/test_ipsec_tun_if_esp.py b/test/test_ipsec_tun_if_esp.py
index b72d464c663..6534dd66190 100644
--- a/test/test_ipsec_tun_if_esp.py
+++ b/test/test_ipsec_tun_if_esp.py
@@ -654,10 +654,8 @@ class TestIpsec4MultiTunIfEsp(TemplateIpsec4TunProtect,
         """Multiple IPSEC tunnel interfaces """
         for p in self.multi_params:
             self.verify_tun_44(p, count=127)
-            c = p.tun_if.get_rx_stats()
-            self.assertEqual(c['packets'], 127)
-            c = p.tun_if.get_tx_stats()
-            self.assertEqual(c['packets'], 127)
+            self.assertEqual(p.tun_if.get_rx_stats(), 127)
+            self.assertEqual(p.tun_if.get_tx_stats(), 127)
 
     def test_tun_rr_44(self):
         """ Round-robin packets acrros multiple interface """
@@ -929,10 +927,8 @@ class TestIpsec6MultiTunIfEsp(TemplateIpsec6TunProtect,
         """Multiple IPSEC tunnel interfaces """
         for p in self.multi_params:
             self.verify_tun_66(p, count=127)
-            c = p.tun_if.get_rx_stats()
-            self.assertEqual(c['packets'], 127)
-            c = p.tun_if.get_tx_stats()
-            self.assertEqual(c['packets'], 127)
+            self.assertEqual(p.tun_if.get_rx_stats(), 127)
+            self.assertEqual(p.tun_if.get_tx_stats(), 127)
 
 
 class TestIpsecGreTebIfEsp(TemplateIpsec,
@@ -1997,17 +1993,13 @@ class TestIpsec4TunProtect(TemplateIpsec,
         self.config_protect(p)
 
         self.verify_tun_44(p, count=127)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 127)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 127)
+        self.assertEqual(p.tun_if.get_rx_stats(), 127)
+        self.assertEqual(p.tun_if.get_tx_stats(), 127)
 
         self.vapi.cli("clear ipsec sa")
         self.verify_tun_64(p, count=127)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 254)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 254)
+        self.assertEqual(p.tun_if.get_rx_stats(), 254)
+        self.assertEqual(p.tun_if.get_tx_stats(), 254)
 
         # rekey - create new SAs and update the tunnel protection
         np = copy.copy(p)
@@ -2024,10 +2016,8 @@ class TestIpsec4TunProtect(TemplateIpsec,
         self.unconfig_sa(p)
 
         self.verify_tun_44(np, count=127)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 381)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 381)
+        self.assertEqual(p.tun_if.get_rx_stats(), 381)
+        self.assertEqual(p.tun_if.get_tx_stats(), 381)
 
         # teardown
         self.unconfig_protect(np)
@@ -2074,10 +2064,8 @@ class TestIpsec4TunProtectUdp(TemplateIpsec,
         p = self.ipv4_params
 
         self.verify_tun_44(p, count=127)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 127)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 127)
+        self.assertEqual(p.tun_if.get_rx_stats(), 127)
+        self.assertEqual(p.tun_if.get_tx_stats(), 127)
 
     def test_keepalive(self):
         """ IPSEC NAT Keepalive """
@@ -2168,10 +2156,8 @@ class TestIpsec4TunProtectTun(TemplateIpsec,
 
         self.verify_tun_44(p, count=127)
 
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 127)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 127)
+        self.assertEqual(p.tun_if.get_rx_stats(), 127)
+        self.assertEqual(p.tun_if.get_tx_stats(), 127)
 
         # rekey - create new SAs and update the tunnel protection
         np = copy.copy(p)
@@ -2188,10 +2174,8 @@ class TestIpsec4TunProtectTun(TemplateIpsec,
         self.unconfig_sa(p)
 
         self.verify_tun_44(np, count=127)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 254)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 254)
+        self.assertEqual(p.tun_if.get_rx_stats(), 254)
+        self.assertEqual(p.tun_if.get_tx_stats(), 254)
 
         # teardown
         self.unconfig_protect(np)
@@ -2275,10 +2259,8 @@ class TestIpsec6TunProtect(TemplateIpsec,
         self.config_protect(p)
 
         self.verify_tun_66(p, count=127)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 127)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 127)
+        self.assertEqual(p.tun_if.get_rx_stats(), 127)
+        self.assertEqual(p.tun_if.get_tx_stats(), 127)
 
         # rekey - create new SAs and update the tunnel protection
         np = copy.copy(p)
@@ -2295,10 +2277,8 @@ class TestIpsec6TunProtect(TemplateIpsec,
         self.unconfig_sa(p)
 
         self.verify_tun_66(np, count=127)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 254)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 254)
+        self.assertEqual(p.tun_if.get_rx_stats(), 254)
+        self.assertEqual(p.tun_if.get_tx_stats(), 254)
 
         # bounce the interface state
         p.tun_if.admin_down()
@@ -2342,10 +2322,8 @@ class TestIpsec6TunProtect(TemplateIpsec,
         self.verify_tun_66(np3, np3, count=127)
         self.verify_drop_tun_66(np, count=127)
 
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 127*9)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 127*8)
+        self.assertEqual(p.tun_if.get_rx_stats(), 127*9)
+        self.assertEqual(p.tun_if.get_tx_stats(), 127*8)
         self.unconfig_sa(np)
 
         # teardown
@@ -2363,10 +2341,8 @@ class TestIpsec6TunProtect(TemplateIpsec,
         self.config_protect(p)
 
         self.verify_tun_46(p, count=127)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 127)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 127)
+        self.assertEqual(p.tun_if.get_rx_stats(), 127)
+        self.assertEqual(p.tun_if.get_tx_stats(), 127)
 
         # teardown
         self.unconfig_protect(p)
@@ -2447,10 +2423,8 @@ class TestIpsec6TunProtectTun(TemplateIpsec,
 
         self.verify_tun_66(p, count=127)
 
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 127)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 127)
+        self.assertEqual(p.tun_if.get_rx_stats(), 127)
+        self.assertEqual(p.tun_if.get_tx_stats(), 127)
 
         # rekey - create new SAs and update the tunnel protection
         np = copy.copy(p)
@@ -2467,10 +2441,8 @@ class TestIpsec6TunProtectTun(TemplateIpsec,
         self.unconfig_sa(p)
 
         self.verify_tun_66(np, count=127)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 254)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 254)
+        self.assertEqual(p.tun_if.get_rx_stats(), 254)
+        self.assertEqual(p.tun_if.get_tx_stats(), 254)
 
         # teardown
         self.unconfig_protect(np)
@@ -2630,29 +2602,23 @@ class TestIpsecItf4(TemplateIpsec,
         self.config_protect(p)
 
         self.verify_tun_44(p, count=n_pkts)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), n_pkts)
 
         p.tun_if.admin_down()
         self.verify_tun_dropped_44(p, count=n_pkts)
         p.tun_if.admin_up()
         self.verify_tun_44(p, count=n_pkts)
 
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 3*n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 2*n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), 3*n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), 2*n_pkts)
 
         # it's a v6 packet when its encrypted
         self.tun4_encrypt_node_name = "esp6-encrypt-tun"
 
         self.verify_tun_64(p, count=n_pkts)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 4*n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 3*n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), 4*n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), 3*n_pkts)
 
         self.tun4_encrypt_node_name = "esp4-encrypt-tun"
 
@@ -2675,10 +2641,8 @@ class TestIpsecItf4(TemplateIpsec,
         self.unconfig_sa(p)
 
         self.verify_tun_44(np, count=n_pkts)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), n_pkts)
 
         # teardown
         self.unconfig_protect(np)
@@ -2735,10 +2699,8 @@ class TestIpsecItf4(TemplateIpsec,
         policer.apply_vpp_config(p.tun_if.sw_if_index, True)
 
         self.verify_tun_44(p, count=n_pkts)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), n_pkts)
 
         stats = policer.get_stats()
 
@@ -2942,29 +2904,23 @@ class TestIpsecItf6(TemplateIpsec,
         self.config_protect(p)
 
         self.verify_tun_66(p, count=n_pkts)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), n_pkts)
 
         p.tun_if.admin_down()
         self.verify_drop_tun_66(p, count=n_pkts)
         p.tun_if.admin_up()
         self.verify_tun_66(p, count=n_pkts)
 
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 3*n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 2*n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), 3*n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), 2*n_pkts)
 
         # it's a v4 packet when its encrypted
         self.tun6_encrypt_node_name = "esp4-encrypt-tun"
 
         self.verify_tun_46(p, count=n_pkts)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], 4*n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], 3*n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), 4*n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), 3*n_pkts)
 
         self.tun6_encrypt_node_name = "esp6-encrypt-tun"
 
@@ -2993,10 +2949,8 @@ class TestIpsecItf6(TemplateIpsec,
         self.unconfig_sa(p)
 
         self.verify_tun_66(np, count=n_pkts)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), n_pkts)
 
         # teardown
         self.unconfig_protect(np)
@@ -3032,10 +2986,8 @@ class TestIpsecItf6(TemplateIpsec,
         policer.apply_vpp_config(p.tun_if.sw_if_index, True)
 
         self.verify_tun_66(p, count=n_pkts)
-        c = p.tun_if.get_rx_stats()
-        self.assertEqual(c['packets'], n_pkts)
-        c = p.tun_if.get_tx_stats()
-        self.assertEqual(c['packets'], n_pkts)
+        self.assertEqual(p.tun_if.get_rx_stats(), n_pkts)
+        self.assertEqual(p.tun_if.get_tx_stats(), n_pkts)
 
         stats = policer.get_stats()