106 lines
3.2 KiB
Python
106 lines
3.2 KiB
Python
#
|
|
# This file is part of LiteEth.
|
|
#
|
|
# Copyright (c) 2015-2019 Florent Kermarrec <florent@enjoy-digital.fr>
|
|
# SPDX-License-Identifier: BSD-2-Clause
|
|
|
|
import math
|
|
|
|
from litex.soc.interconnect.stream_sim import *
|
|
|
|
from liteeth.common import *
|
|
|
|
from test.model import ip
|
|
|
|
# Helpers ------------------------------------------------------------------------------------------
|
|
|
|
def print_udp(s):
|
|
print_with_prefix(s, "[UDP]")
|
|
|
|
|
|
# UDP Packet ---------------------------------------------------------------------------------------
|
|
|
|
class UDPPacket(Packet):
|
|
def __init__(self, init=[]):
|
|
Packet.__init__(self, init)
|
|
|
|
def decode(self):
|
|
header = []
|
|
for byte in self[:udp_header.length]:
|
|
header.append(self.pop(0))
|
|
for k, v in sorted(udp_header.fields.items()):
|
|
setattr(self, k, get_field_data(v, header))
|
|
|
|
def encode(self):
|
|
header = 0
|
|
for k, v in sorted(udp_header.fields.items()):
|
|
value = merge_bytes(split_bytes(getattr(self, k),
|
|
math.ceil(v.width/8)),
|
|
"little")
|
|
header += (value << v.offset+(v.byte*8))
|
|
for d in split_bytes(header, udp_header.length):
|
|
self.insert(0, d)
|
|
|
|
def __repr__(self):
|
|
r = "--------\n"
|
|
for k in sorted(udp_header.fields.keys()):
|
|
r += k + " : 0x{:0x}\n".format(getattr(self, k))
|
|
r += "payload: "
|
|
for d in self:
|
|
r += "{:02x}".format(d)
|
|
return r
|
|
|
|
# UDP ----------------------------------------------------------------------------------------------
|
|
|
|
class UDP(Module):
|
|
def __init__(self, ip, ip_address, debug=False, loopback=False):
|
|
self.ip = ip
|
|
self.ip_address = ip_address
|
|
self.debug = debug
|
|
self.loopback = loopback
|
|
self.tx_packets = []
|
|
self.tx_packet = UDPPacket()
|
|
self.rx_packet = UDPPacket()
|
|
|
|
self.etherbone_callback = None
|
|
|
|
self.ip.set_udp_callback(self.callback)
|
|
|
|
def set_etherbone_callback(self, callback):
|
|
self.etherbone_callback = callback
|
|
|
|
def send(self, packet):
|
|
packet.encode()
|
|
if self.debug:
|
|
print_udp(">>>>>>>>")
|
|
print_udp(packet)
|
|
ip_packet = ip.IPPacket(packet)
|
|
ip_packet.version = 0x4
|
|
ip_packet.ihl = 0x5
|
|
ip_packet.total_length = len(packet) + ip_packet.ihl
|
|
ip_packet.identification = 0
|
|
ip_packet.flags = 0
|
|
ip_packet.fragment_offset = 0
|
|
ip_packet.ttl = 0x80
|
|
ip_packet.sender_ip = self.ip_address
|
|
ip_packet.target_ip = 0x12345678 # FIXME
|
|
ip_packet.checksum = 0
|
|
ip_packet.protocol = udp_protocol
|
|
self.ip.send(ip_packet)
|
|
|
|
def callback(self, packet):
|
|
packet = UDPPacket(packet)
|
|
packet.decode()
|
|
if self.debug:
|
|
print_udp("<<<<<<<<")
|
|
print_udp(packet)
|
|
if self.loopback:
|
|
self.send(packet)
|
|
else:
|
|
self.process(packet)
|
|
|
|
def process(self, packet):
|
|
if packet.dst_port == 0x1234: # FIXME
|
|
if self.etherbone_callback is not None:
|
|
self.etherbone_callback(packet)
|