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// This script tracks time between packet queue and transmit. The
// information is provided to userspace via procfs in JSON format.

global net_devices

probe json_data
{
  @json_output_data_start

  foreach (dev in net_devices) {
    if (@count(skb_queue_t[dev])) {
      @json_output_array_numeric_value("net_xmit_data", dev, "xmit_count",
				       @sum(skb_queue_t[dev]))
      @json_output_array_numeric_value("net_xmit_data", dev, "xmit_latency",
				       @count(skb_queue_t[dev]))
    }
    else {
      @json_output_array_numeric_value("net_xmit_data", dev, "xmit_count", 0)
      @json_output_array_numeric_value("net_xmit_data", dev, "xmit_latency", 0)
    }
  }

  @json_output_data_end
}

// Set up the metrics
probe begin
{
  // fallback instance device "eth0" if none specified
  if (argc == 0) {
    argv[1] = "eth0"
    argc = 1
  }
  
  // remember all the network devices
  for (i = 1; i <= argc; i++) {
    dev = argv[i]
    net_devices[dev] = i - 1
  }

  // Set the prefix to be used instead of the module name.
  json_set_prefix("net_xmit")

  // Add the metrics
  json_add_array("net_xmit_data",
		 "Network transmit data indexed by ethernet device")
  json_add_array_numeric_metric("net_xmit_data", "xmit_count",
				"number of packets for xmit device", "count")
  json_add_array_numeric_metric("net_xmit_data", "xmit_latency",
				"sum of latency for xmit device", "")
}

// probes to track the information

global skb_queue_start_t, skb_queue_t

probe kernel.trace("net_dev_queue") {
  skb_queue_start_t[$skb] = gettimeofday_ns();
}

probe kernel.trace("net_dev_start_xmit") ?, kernel.trace("net_dev_xmit") {
  t = gettimeofday_ns();
  st = skb_queue_start_t[$skb]
  if (st){
    skb_queue_t[kernel_string($dev->name)] <<< t - st
    delete skb_queue_start_t[$skb]
  }
}