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from trex_stl_lib.api import *
# step is not 1.
class STLS1(object):
def __init__ (self):
self.fsize =64; # the size of the packet
def create_stream (self):
# Create base packet and pad it to size
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'
vm = STLScVmRaw( [ STLVmFlowVar(name="mac_src", min_value=1, max_value=30, size=2, op="dec",step=1),
STLVmWrMaskFlowVar(fv_name="mac_src", pkt_offset= 10,pkt_cast_size=1, mask=0x1,shift=-1) # take var mac_src>>1 and write the LSB every two packet there should be a change
]
)
return STLStream(packet = STLPktBuilder(pkt = base_pkt/pad,vm = vm),
mode = STLTXCont( pps=10 ))
def get_streams (self, direction = 0, **kwargs):
# create 1 stream
return [ self.create_stream() ]
# dynamic load - used for trex console or simulator
def register():
return STLS1()
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