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// SPDX-License-Identifier: GPL-3.0-or-later
#include "plugin_proc.h"
#define PLUGIN_PROC_MODULE_NET_SOFTNET_NAME "/proc/net/softnet_stat"
static inline char *softnet_column_name(size_t column) {
switch(column) {
// https://github.com/torvalds/linux/blob/a7fd20d1c476af4563e66865213474a2f9f473a4/net/core/net-procfs.c#L161-L166
case 0: return "processed";
case 1: return "dropped";
case 2: return "squeezed";
case 9: return "received_rps";
case 10: return "flow_limit_count";
default: return NULL;
}
}
int do_proc_net_softnet_stat(int update_every, usec_t dt) {
(void)dt;
static procfile *ff = NULL;
static int do_per_core = -1;
static size_t allocated_lines = 0, allocated_columns = 0;
static uint32_t *data = NULL;
if(unlikely(do_per_core == -1)) do_per_core = config_get_boolean("plugin:proc:/proc/net/softnet_stat", "softnet_stat per core", 1);
if(unlikely(!ff)) {
char filename[FILENAME_MAX + 1];
snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/net/softnet_stat");
ff = procfile_open(config_get("plugin:proc:/proc/net/softnet_stat", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
if(unlikely(!ff)) return 1;
}
ff = procfile_readall(ff);
if(unlikely(!ff)) return 0; // we return 0, so that we will retry to open it next time
size_t lines = procfile_lines(ff), l;
size_t words = procfile_linewords(ff, 0), w;
if(unlikely(!lines || !words)) {
error("Cannot read /proc/net/softnet_stat, %zu lines and %zu columns reported.", lines, words);
return 1;
}
if(unlikely(lines > 200)) lines = 200;
if(unlikely(words > 50)) words = 50;
if(unlikely(!data || lines > allocated_lines || words > allocated_columns)) {
freez(data);
allocated_lines = lines;
allocated_columns = words;
data = mallocz((allocated_lines + 1) * allocated_columns * sizeof(uint32_t));
}
// initialize to zero
memset(data, 0, (allocated_lines + 1) * allocated_columns * sizeof(uint32_t));
// parse the values
for(l = 0; l < lines ;l++) {
words = procfile_linewords(ff, l);
if(unlikely(!words)) continue;
if(unlikely(words > allocated_columns))
words = allocated_columns;
for(w = 0; w < words ; w++) {
if(unlikely(softnet_column_name(w))) {
uint32_t t = (uint32_t)strtoul(procfile_lineword(ff, l, w), NULL, 16);
data[w] += t;
data[((l + 1) * allocated_columns) + w] = t;
}
}
}
if(unlikely(data[(lines * allocated_columns)] == 0))
lines--;
RRDSET *st;
// --------------------------------------------------------------------
st = rrdset_find_bytype_localhost("system", "softnet_stat");
if(unlikely(!st)) {
st = rrdset_create_localhost(
"system"
, "softnet_stat"
, NULL
, "softnet_stat"
, "system.softnet_stat"
, "System softnet_stat"
, "events/s"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_NET_SOFTNET_NAME
, NETDATA_CHART_PRIO_SYSTEM_SOFTNET_STAT
, update_every
, RRDSET_TYPE_LINE
);
for(w = 0; w < allocated_columns ;w++)
if(unlikely(softnet_column_name(w)))
rrddim_add(st, softnet_column_name(w), NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
}
else rrdset_next(st);
for(w = 0; w < allocated_columns ;w++)
if(unlikely(softnet_column_name(w)))
rrddim_set(st, softnet_column_name(w), data[w]);
rrdset_done(st);
if(do_per_core) {
for(l = 0; l < lines ;l++) {
char id[50+1];
snprintfz(id, 50, "cpu%zu_softnet_stat", l);
st = rrdset_find_bytype_localhost("cpu", id);
if(unlikely(!st)) {
char title[100+1];
snprintfz(title, 100, "CPU%zu softnet_stat", l);
st = rrdset_create_localhost(
"cpu"
, id
, NULL
, "softnet_stat"
, "cpu.softnet_stat"
, title
, "events/s"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_NET_SOFTNET_NAME
, NETDATA_CHART_PRIO_SOFTNET_PER_CORE + l
, update_every
, RRDSET_TYPE_LINE
);
for(w = 0; w < allocated_columns ;w++)
if(unlikely(softnet_column_name(w)))
rrddim_add(st, softnet_column_name(w), NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
}
else rrdset_next(st);
for(w = 0; w < allocated_columns ;w++)
if(unlikely(softnet_column_name(w)))
rrddim_set(st, softnet_column_name(w), data[((l + 1) * allocated_columns) + w]);
rrdset_done(st);
}
}
return 0;
}
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