litex/liteeth/core/etherbone/packet.py

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from liteeth.common import *
from liteeth.generic import *
from liteeth.generic.depacketizer import LiteEthDepacketizer
from liteeth.generic.packetizer import LiteEthPacketizer
class LiteEthEtherbonePacketPacketizer(LiteEthPacketizer):
def __init__(self):
LiteEthPacketizer.__init__(self,
eth_etherbone_packet_description(32),
eth_udp_user_description(32),
etherbone_packet_header,
etherbone_packet_header_len)
class LiteEthEtherbonePacketTX(Module):
def __init__(self, udp_port):
self.sink = sink = Sink(eth_etherbone_packet_user_description(32))
self.source = source = Source(eth_udp_user_description(32))
###
self.submodules.packetizer = packetizer = LiteEthEtherbonePacketPacketizer()
self.comb += [
packetizer.sink.stb.eq(sink.stb),
packetizer.sink.sop.eq(sink.sop),
packetizer.sink.eop.eq(sink.eop),
sink.ack.eq(packetizer.sink.ack),
packetizer.sink.magic.eq(etherbone_magic),
packetizer.sink.port_size.eq(32//8),
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packetizer.sink.addr_size.eq(32//8),
packetizer.sink.pf.eq(sink.pf),
packetizer.sink.pr.eq(sink.pr),
packetizer.sink.nr.eq(sink.nr),
packetizer.sink.version.eq(etherbone_version),
packetizer.sink.data.eq(sink.data)
]
self.submodules.fsm = fsm = FSM(reset_state="IDLE")
fsm.act("IDLE",
packetizer.source.ack.eq(1),
If(packetizer.source.stb & packetizer.source.sop,
packetizer.source.ack.eq(0),
NextState("SEND")
)
)
fsm.act("SEND",
Record.connect(packetizer.source, source),
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source.src_port.eq(udp_port),
source.dst_port.eq(udp_port),
source.ip_address.eq(sink.ip_address),
source.length.eq(sink.length + etherbone_packet_header_len),
If(source.stb & source.eop & source.ack,
NextState("IDLE")
)
)
class LiteEthEtherbonePacketDepacketizer(LiteEthDepacketizer):
def __init__(self):
LiteEthDepacketizer.__init__(self,
eth_udp_user_description(32),
eth_etherbone_packet_description(32),
etherbone_packet_header,
etherbone_packet_header_len)
class LiteEthEtherbonePacketRX(Module):
def __init__(self):
self.sink = sink = Sink(eth_udp_user_description(32))
self.source = source = Source(eth_etherbone_packet_user_description(32))
###
self.submodules.depacketizer = depacketizer = LiteEthEtherbonePacketDepacketizer()
self.comb += Record.connect(sink, depacketizer.sink)
self.submodules.fsm = fsm = FSM(reset_state="IDLE")
fsm.act("IDLE",
depacketizer.source.ack.eq(1),
If(depacketizer.source.stb & depacketizer.source.sop,
depacketizer.source.ack.eq(0),
NextState("CHECK")
)
)
valid = Signal()
self.sync += valid.eq(
depacketizer.source.stb &
(depacketizer.source.magic == etherbone_magic)
)
fsm.act("CHECK",
If(valid,
NextState("PRESENT")
).Else(
NextState("DROP")
)
)
self.comb += [
source.sop.eq(depacketizer.source.sop),
source.eop.eq(depacketizer.source.eop),
source.pf.eq(depacketizer.source.pf),
source.pr.eq(depacketizer.source.pr),
source.nr.eq(depacketizer.source.nr),
source.data.eq(depacketizer.source.data),
source.src_port.eq(sink.src_port),
source.dst_port.eq(sink.dst_port),
source.ip_address.eq(sink.ip_address),
source.length.eq(sink.length - etherbone_packet_header_len)
]
fsm.act("PRESENT",
source.stb.eq(depacketizer.source.stb),
depacketizer.source.ack.eq(source.ack),
If(source.stb & source.eop & source.ack,
NextState("IDLE")
)
)
fsm.act("DROP",
depacketizer.source.ack.eq(1),
If(depacketizer.source.stb & depacketizer.source.eop & depacketizer.source.ack,
NextState("IDLE")
)
)
class LiteEthEtherbonePacket(Module):
def __init__(self, udp, udp_port):
self.submodules.tx = tx = LiteEthEtherbonePacketTX(udp_port)
self.submodules.rx = rx = LiteEthEtherbonePacketRX()
udp_port = udp.crossbar.get_port(udp_port, dw=32)
self.comb += [
Record.connect(tx.source, udp_port.sink),
Record.connect(udp_port.source, rx.sink)
]
self.sink, self.source = self.tx.sink, self.rx.source