add Linux Softnet Stat app (#15094)

* add linux_softnet_stat poller

* add graphs and app page for linux_softnet_stat

* fix polling

* rename a few items, clean up the app specific page, and add to the apps page

* convert from derive to counter

* save the budget and budget_usecs to app data

* display current value of the budgets

* now track budget values

* add tests data

* rename it

* add docs for Linux Softnet Stat

* re-order and add budget for app page graph order

* style fix

* correct data location

* fix metrics for the json

includes/html/graphs/application/linux_softnet_stat_backlog_length.inc.php

@@ -0,0 +1,11 @@
+<?php
+
+$ds = 'backlog_length';
+$unit_text = 'Backlog Length';
+$filename = Rrd::name($device['hostname'], ['app', 'linux_softnet_stat', $app->app_id]);
+
+if (! Rrd::checkRrdExists($filename)) {
+    d_echo('RRD "' . $filename . '" not found');
+}
+
+require 'includes/html/graphs/generic_stats.inc.php';

includes/html/graphs/application/linux_softnet_stat_budget.inc.php

@@ -0,0 +1,29 @@
+<?php
+
+$name = 'linux_softnet_stat';
+$unit_text = 'Budget Value';
+$colours = 'psychedelic';
+$dostack = 0;
+$printtotal = 0;
+$addarea = 1;
+$transparency = 15;
+
+$rrd_filename = Rrd::name($device['hostname'], ['app', $name, $app->app_id]);
+
+$rrd_list = [];
+if (Rrd::checkRrdExists($rrd_filename)) {
+    $rrd_list[] = [
+        'filename' => $rrd_filename,
+        'descr'    => 'Budget',
+        'ds'       => 'budget',
+    ];
+    $rrd_list[] = [
+        'filename' => $rrd_filename,
+        'descr'    => 'Budget usecs',
+        'ds'       => 'budget_usecs',
+    ];
+} else {
+    d_echo('RRD "' . $rrd_filename . '" not found');
+}
+
+require 'includes/html/graphs/generic_multi_line.inc.php';

includes/html/graphs/application/linux_softnet_stat_cpu_collision.inc.php

@@ -0,0 +1,11 @@
+<?php
+
+$ds = 'cpu_collision';
+$unit_text = 'CPU Collision';
+$filename = Rrd::name($device['hostname'], ['app', 'linux_softnet_stat', $app->app_id]);
+
+if (! Rrd::checkRrdExists($filename)) {
+    d_echo('RRD "' . $filename . '" not found');
+}
+
+require 'includes/html/graphs/generic_stats.inc.php';

includes/html/graphs/application/linux_softnet_stat_flow_limit.inc.php

@@ -0,0 +1,11 @@
+<?php
+
+$ds = 'flow_limit';
+$unit_text = 'Limit Hits/Sec';
+$filename = Rrd::name($device['hostname'], ['app', 'linux_softnet_stat', $app->app_id]);
+
+if (! Rrd::checkRrdExists($filename)) {
+    d_echo('RRD "' . $filename . '" not found');
+}
+
+require 'includes/html/graphs/generic_stats.inc.php';

includes/html/graphs/application/linux_softnet_stat_packet_dropped.inc.php

@@ -0,0 +1,11 @@
+<?php
+
+$ds = 'packet_dropped';
+$unit_text = 'Pkt Drops/Sec';
+$filename = Rrd::name($device['hostname'], ['app', 'linux_softnet_stat', $app->app_id]);
+
+if (! Rrd::checkRrdExists($filename)) {
+    d_echo('RRD "' . $filename . '" not found');
+}
+
+require 'includes/html/graphs/generic_stats.inc.php';

includes/html/graphs/application/linux_softnet_stat_packets.inc.php

@@ -0,0 +1,11 @@
+<?php
+
+$ds = 'packets';
+$unit_text = 'Pkts/Sec';
+$filename = Rrd::name($device['hostname'], ['app', 'linux_softnet_stat', $app->app_id]);
+
+if (! Rrd::checkRrdExists($filename)) {
+    d_echo('RRD "' . $filename . '" not found');
+}
+
+require 'includes/html/graphs/generic_stats.inc.php';

includes/html/graphs/application/linux_softnet_stat_received_rps.inc.php

@@ -0,0 +1,11 @@
+<?php
+
+$ds = 'received_rps';
+$unit_text = 'RPS/Sec';
+$filename = Rrd::name($device['hostname'], ['app', 'linux_softnet_stat', $app->app_id]);
+
+if (! Rrd::checkRrdExists($filename)) {
+    d_echo('RRD "' . $filename . '" not found');
+}
+
+require 'includes/html/graphs/generic_stats.inc.php';

includes/html/graphs/application/linux_softnet_stat_time_squeeze.inc.php

@@ -0,0 +1,11 @@
+<?php
+
+$ds = 'time_squeeze';
+$unit_text = 'Time Squeeze';
+$filename = Rrd::name($device['hostname'], ['app', 'linux_softnet_stat', $app->app_id]);
+
+if (! Rrd::checkRrdExists($filename)) {
+    d_echo('RRD "' . $filename . '" not found');
+}
+
+require 'includes/html/graphs/generic_stats.inc.php';

includes/html/pages/apps.inc.php

@@ -456,6 +456,16 @@ $graphs['wireguard'] = [
 $graphs['linux_config_files'] = [
     'number_of_confs',
 ];
+$graphs['linux_softnet_stat'] = [
+    'packets',
+    'time_squeeze',
+    'backlog_length',
+    'packet_dropped',
+    'cpu_collision',
+    'flow_limit',
+    'received_rps',
+    'budget',
+];
 
 echo '<div class="panel panel-default">';
 echo '<div class="panel-heading">';

includes/html/pages/device/apps/linux_softnet_stat.inc.php

@@ -0,0 +1,39 @@
+<?php
+
+$budget = $app->data['budget'] ?? 'unknown';
+$budget_usecs = $app->data['budget_usecs'] ?? 'unknown';
+
+print_optionbar_start();
+echo 'Current Budget: ' . $budget . "<br>\nCurrent Budget usecs:" . $budget_usecs . "\n<br>";
+print_optionbar_end();
+
+$graphs = [
+    'linux_softnet_stat_packets' => 'Packets Per Second',
+    'linux_softnet_stat_time_squeeze' => 'Time Squeezes Per Second',
+    'linux_softnet_stat_backlog_length' => 'Backlog Lenght',
+    'linux_softnet_stat_packet_dropped' => 'Packets Dropped Per Second',
+    'linux_softnet_stat_cpu_collision' => 'CPU Collisions Per Second',
+    'linux_softnet_stat_flow_limit' => 'Flow Limit Hit Per Second',
+    'linux_softnet_stat_received_rps' => 'Received RPS Per Second',
+    'linux_softnet_stat_budget' => 'Budget Sysctl Values',
+];
+
+foreach ($graphs as $key => $text) {
+    $graph_type = $key;
+    $graph_array['height'] = '100';
+    $graph_array['width'] = '215';
+    $graph_array['to'] = \LibreNMS\Config::get('time.now');
+    $graph_array['id'] = $app['app_id'];
+    $graph_array['type'] = 'application_' . $key;
+
+    echo '<div class="panel panel-default">
+    <div class="panel-heading">
+        <h3 class="panel-title">' . $text . '</h3>
+    </div>
+    <div class="panel-body">
+    <div class="row">';
+    include 'includes/html/print-graphrow.inc.php';
+    echo '</div>';
+    echo '</div>';
+    echo '</div>';
+}