perfmon: new perfmon plugin

Type: feature
Change-Id: I2c14f82393d11fc05c6d229f5c58603ab5c0f14d
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/src/plugins/perfmon/dispatch_wrapper.c b/src/plugins/perfmon/dispatch_wrapper.c
new file mode 100644
index 00000000000..4ae9c7707ef
--- /dev/null
+++ b/src/plugins/perfmon/dispatch_wrapper.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2020 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/vnet.h>
+
+#include <vlibapi/api.h>
+#include <vlibmemory/api.h>
+#include <vnet/plugin/plugin.h>
+#include <vpp/app/version.h>
+#include <linux/limits.h>
+#include <sys/ioctl.h>
+
+#include <perfmon/perfmon.h>
+
+static_always_inline void
+perfmon_read_pmcs (u64 *counters, int *pmc_index, u8 n_counters)
+{
+  switch (n_counters)
+    {
+    default:
+    case 7:
+      counters[6] = _rdpmc (pmc_index[6]);
+    case 6:
+      counters[5] = _rdpmc (pmc_index[5]);
+    case 5:
+      counters[4] = _rdpmc (pmc_index[4]);
+    case 4:
+      counters[3] = _rdpmc (pmc_index[3]);
+    case 3:
+      counters[2] = _rdpmc (pmc_index[2]);
+    case 2:
+      counters[1] = _rdpmc (pmc_index[1]);
+    case 1:
+      counters[0] = _rdpmc (pmc_index[0]);
+      break;
+    }
+}
+
+static_always_inline int
+perfmon_calc_pmc_index (perfmon_thread_runtime_t *tr, u8 i)
+{
+  return (int) (tr->mmap_pages[i]->index + tr->mmap_pages[i]->offset);
+}
+
+uword
+perfmon_dispatch_wrapper (vlib_main_t *vm, vlib_node_runtime_t *node,
+			  vlib_frame_t *frame)
+{
+  perfmon_main_t *pm = &perfmon_main;
+  perfmon_thread_runtime_t *rt =
+    vec_elt_at_index (pm->thread_runtimes, vm->thread_index);
+  perfmon_node_stats_t *s =
+    vec_elt_at_index (rt->node_stats, node->node_index);
+  u8 n_events = rt->n_events;
+  int pmc_index[PERF_MAX_EVENTS];
+  u64 before[PERF_MAX_EVENTS];
+  u64 after[PERF_MAX_EVENTS];
+  uword rv;
+
+  clib_prefetch_load (s);
+
+  switch (n_events)
+    {
+    default:
+    case 7:
+      pmc_index[6] = perfmon_calc_pmc_index (rt, 6);
+    case 6:
+      pmc_index[5] = perfmon_calc_pmc_index (rt, 5);
+    case 5:
+      pmc_index[4] = perfmon_calc_pmc_index (rt, 4);
+    case 4:
+      pmc_index[3] = perfmon_calc_pmc_index (rt, 3);
+    case 3:
+      pmc_index[2] = perfmon_calc_pmc_index (rt, 2);
+    case 2:
+      pmc_index[1] = perfmon_calc_pmc_index (rt, 1);
+    case 1:
+      pmc_index[0] = perfmon_calc_pmc_index (rt, 0);
+      break;
+    }
+
+  perfmon_read_pmcs (before, pmc_index, n_events);
+  rv = node->function (vm, node, frame);
+  perfmon_read_pmcs (after, pmc_index, n_events);
+
+  if (rv == 0)
+    return rv;
+
+  s->n_calls += 1;
+  s->n_packets += rv;
+  for (int i = 0; i < n_events; i++)
+    s->value[i] += after[i] - before[i];
+
+  return rv;
+}