123 lines
3.3 KiB
Python
123 lines
3.3 KiB
Python
from liteeth.common import *
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from liteeth.generic.depacketizer import LiteEthDepacketizer
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from liteeth.generic.packetizer import LiteEthPacketizer
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class LiteEthUDPDepacketizer(LiteEthDepacketizer):
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def __init__(self):
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LiteEthDepacketizer.__init__(self,
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eth_ipv4_user_description(8),
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eth_udp_description(8),
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udp_header,
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udp_header_len)
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class LiteEthUDPPacketizer(LiteEthPacketizer):
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def __init__(self):
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LiteEthPacketizer.__init__(self,
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eth_udp_description(8),
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eth_ipv4_user_description(8),
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udp_header,
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udp_header_len)
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class LiteEthUDPTX(Module):
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def __init__(self, ip_address):
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self.sink = Sink(eth_udp_user_description(8))
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self.source = Source(eth_ipv4_user_description(8))
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###
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packetizer = LiteEthUDPPacketizer()
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self.submodules += packetizer
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self.comb += [
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packetizer.sink.stb.eq(self.sink.stb),
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packetizer.sink.sop.eq(self.sink.sop),
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packetizer.sink.eop.eq(self.sink.eop),
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self.sink.eq(packetizer.sink.ack),
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packetizer.sink.source_port.eq(self.sink.source_port),
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packetizer.sink.destination_port.eq(self.sink.destination_port),
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packetizer.sink.length.eq(self.sink.length + udp_header_len),
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packetizer.sink.checksum.eq(0),
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]
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sink = packetizer.source
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fsm = FSM(reset_state="IDLE")
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self.submodules += fsm
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fsm.act("IDLE",
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sink.ack.eq(1),
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If(sink.stb & sink.sop,
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sink.ack.eq(0),
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NextState("SEND")
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)
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)
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fsm.act("SEND",
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Record.connect(packetizer.source, self.source),
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self.source.length.eq(packetizer.sink.length + ipv4_header_len),
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self.source.protocol.eq(udp_protocol),
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self.source.ip_address.eq(self.sink.ip_address),
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If(self.source.stb & self.source.eop & self.source.ack,
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NextState("IDLE")
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)
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)
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class LiteEthUDPRX(Module):
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def __init__(self, ip_address):
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self.sink = Sink(eth_ipv4_user_description(8))
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self.source = source = Source(eth_udp_user_description(8))
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###
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depacketizer = LiteEthUDPDepacketizer()
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self.submodules += depacketizer
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self.comb += Record.connect(self.sink, depacketizer.sink)
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sink = depacketizer.source
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fsm = FSM(reset_state="IDLE")
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self.submodules += fsm
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fsm.act("IDLE",
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sink.ack.eq(1),
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If(sink.stb & sink.sop,
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sink.ack.eq(0),
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NextState("CHECK")
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)
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)
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valid = Signal()
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self.comb += valid.eq(
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sink.stb &
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(self.sink.protocol == udp_protocol) &
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(self.sink.ip_address == ip_address)
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)
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fsm.act("CHECK",
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If(valid,
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NextState("PRESENT")
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).Else(
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NextState("DROP")
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)
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),
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fsm.act("PRESENT",
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source.stb.eq(sink.stb),
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source.sop.eq(sink.sop),
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source.eop.eq(sink.eop),
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sink.ack.eq(source.ack),
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source.source_port.eq(sink.source_port),
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source.destination_port.eq(sink.destination_port),
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source.ip_address.eq(0),
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source.length.eq(sink.length - udp_header_len),
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source.data.eq(sink.data),
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source.error.eq(sink.error),
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If(source.stb & source.eop & source.ack,
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NextState("IDLE")
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)
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)
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fsm.act("DROP",
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sink.ack.eq(1),
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If(source.stb & source.eop & source.ack,
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NextState("IDLE")
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)
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)
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class LiteEthUDP(Module):
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def __init__(self, ip, ip_address):
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self.submodules.tx = LiteEthUDPTX(ip_address)
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self.submodules.rx = LiteEthUDPRX(ip_address)
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self.comb += [
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Record.connect(self.tx.source, ip.sink),
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Record.connect(ip.source, self.rx.sink)
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]
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self.sink, self.source = self.tx.sink, self.rx.source
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