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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 u64
perfmon_mmap_read_pmc1 (const struct perf_event_mmap_page *mmap_page)
{
u64 count;
u32 seq;
/* See documentation in /usr/include/linux/perf_event.h, for more details
* but the 2 main important things are:
* 1) if seq != mmap_page->lock, it means the kernel is currently updating
* the user page and we need to read it again
* 2) if idx == 0, it means the perf event is currently turned off and we
* just need to read the kernel-updated 'offset', otherwise we must also
* add the current hw value (hence rdmpc) */
do
{
u32 idx;
seq = mmap_page->lock;
CLIB_COMPILER_BARRIER ();
idx = mmap_page->index;
count = mmap_page->offset;
if (idx)
count += _rdpmc (idx - 1);
CLIB_COMPILER_BARRIER ();
}
while (mmap_page->lock != seq);
return count;
}
static_always_inline void
perfmon_mmap_read_pmcs (u64 *counters,
struct perf_event_mmap_page **mmap_pages,
u8 n_counters)
{
switch (n_counters)
{
default:
case 7:
counters[6] = perfmon_mmap_read_pmc1 (mmap_pages[6]);
case 6:
counters[5] = perfmon_mmap_read_pmc1 (mmap_pages[5]);
case 5:
counters[4] = perfmon_mmap_read_pmc1 (mmap_pages[4]);
case 4:
counters[3] = perfmon_mmap_read_pmc1 (mmap_pages[3]);
case 3:
counters[2] = perfmon_mmap_read_pmc1 (mmap_pages[2]);
case 2:
counters[1] = perfmon_mmap_read_pmc1 (mmap_pages[1]);
case 1:
counters[0] = perfmon_mmap_read_pmc1 (mmap_pages[0]);
break;
}
}
uword
perfmon_dispatch_wrapper_mmap (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;
u64 before[PERF_MAX_EVENTS];
u64 after[PERF_MAX_EVENTS];
uword rv;
clib_prefetch_load (s);
perfmon_mmap_read_pmcs (&before[0], rt->mmap_pages, n_events);
rv = node->function (vm, node, frame);
perfmon_mmap_read_pmcs (&after[0], rt->mmap_pages, 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;
}
static_always_inline void
perfmon_metric_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_metric_index (perfmon_bundle_t *b, u8 i)
{
return (int) (b->metrics[i]);
}
uword
perfmon_dispatch_wrapper_metrics (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;
u64 before[PERF_MAX_EVENTS];
int pmc_index[PERF_MAX_EVENTS];
uword rv;
clib_prefetch_load (s);
switch (n_events)
{
default:
case 7:
pmc_index[6] = perfmon_metric_index (rt->bundle, 6);
case 6:
pmc_index[5] = perfmon_metric_index (rt->bundle, 5);
case 5:
pmc_index[4] = perfmon_metric_index (rt->bundle, 4);
case 4:
pmc_index[3] = perfmon_metric_index (rt->bundle, 3);
case 3:
pmc_index[2] = perfmon_metric_index (rt->bundle, 2);
case 2:
pmc_index[1] = perfmon_metric_index (rt->bundle, 1);
case 1:
pmc_index[0] = perfmon_metric_index (rt->bundle, 0);
break;
}
perfmon_metric_read_pmcs (&before[0], pmc_index, n_events);
rv = node->function (vm, node, frame);
clib_memcpy_fast (&s->t[0].value[0], &before, sizeof (before));
perfmon_metric_read_pmcs (&s->t[1].value[0], pmc_index, n_events);
if (rv == 0)
return rv;
s->n_calls += 1;
s->n_packets += rv;
return rv;
}
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