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/*
* 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 "vppinfra/string.h"
#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, u32 *indexes, u8 n_counters)
{
switch (n_counters)
{
case 12:
counters[11] = _rdpmc (indexes[11] - 1);
case 11:
counters[10] = _rdpmc (indexes[10] - 1);
case 10:
counters[9] = _rdpmc (indexes[9] - 1);
case 9:
counters[8] = _rdpmc (indexes[8] - 1);
case 8:
counters[7] = _rdpmc (indexes[7] - 1);
case 7:
counters[6] = _rdpmc (indexes[6] - 1);
case 6:
counters[5] = _rdpmc (indexes[5] - 1);
case 5:
counters[4] = _rdpmc (indexes[4] - 1);
case 4:
counters[3] = _rdpmc (indexes[3] - 1);
case 3:
counters[2] = _rdpmc (indexes[2] - 1);
case 2:
counters[1] = _rdpmc (indexes[1] - 1);
case 1:
counters[0] = _rdpmc (indexes[0] - 1);
}
}
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;
struct
{
u64 t[2][PERF_MAX_EVENTS];
} samples;
uword rv;
clib_prefetch_load (s);
perfmon_read_pmcs (&samples.t[0][0], &rt->indexes[0], n_events);
rv = node->function (vm, node, frame);
perfmon_read_pmcs (&samples.t[1][0], &rt->indexes[0], n_events);
if (rv == 0)
return rv;
s->n_calls += 1;
s->n_packets += rv;
for (int i = 0; i < n_events; i++)
{
if (!(rt->preserve_samples & 1 << i))
{
s->value[i] += samples.t[1][i] - samples.t[0][i];
}
else
{
s->t[0].value[i] = samples.t[0][i];
s->t[1].value[i] = samples.t[1][i];
}
}
return rv;
}
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