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from trex_stl_lib.api import *
class STLS1(object):
"""
Create flow stat latency stream of UDP packet.
Can specify using tunables the packet length (fsize) and packet group id (pg_id)
Since we can't have two latency streams with same pg_id, in order to be able to start this profile
on more than one port, we add port_id to the pg_id
Notice that for perfomance reasons, latency streams are not affected by -m flag, so
you can only change the pps value by editing the code.
"""
def __init__ (self):
self.fsize = 64
self.pg_id = 0
def _create_stream (self):
size = self.fsize - 4; # HW will add 4 bytes ethernet FCS
base_pkt = Ether() / IP(src = "16.0.0.1", dst = "48.0.0.1") / UDP(dport = 12, sport = 1025)
pad = max(0, size - len(base_pkt)) * 'x'
pkt = STLPktBuilder(pkt = base_pkt/pad)
return [STLStream(packet = pkt,
mode = STLTXCont(pps=1000),
flow_stats = STLFlowLatencyStats(pg_id = self.pg_id))
]
def get_streams (self, fsize = 64, pg_id = 7, **kwargs):
self.fsize = fsize
self.pg_id = pg_id + kwargs['port_id']
return self._create_stream()
# dynamic load - used for trex console or simulator
def register():
return STLS1()
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