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-rw-r--r--src/plugins/perfmon/dispatch_wrapper.c107
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
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+++ 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;
+}