litex/liteeth/common.py

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import math
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from collections import OrderedDict
from migen.fhdl.std import *
from migen.fhdl.decorators import ModuleDecorator
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from migen.genlib.resetsync import AsyncResetSynchronizer
from migen.genlib.record import *
from migen.genlib.fsm import FSM, NextState
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from migen.genlib.misc import chooser
from migen.flow.actor import *
from migen.flow.plumbing import Buffer
from migen.actorlib.structuring import Converter, Pipeline
from migen.actorlib.fifo import SyncFIFO, AsyncFIFO
from migen.bank.description import *
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eth_mtu = 1532
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eth_min_len = 46
eth_interpacket_gap = 12
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eth_preamble = 0xD555555555555555
buffer_depth = 2**log2_int(eth_mtu, need_pow2=False)
class HField():
def __init__(self, byte, offset, width):
self.byte = byte
self.offset = offset
self.width = width
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ethernet_type_ip = 0x800
ethernet_type_arp = 0x806
mac_header_len = 14
mac_header = {
"target_mac": HField(0, 0, 48),
"sender_mac": HField(6, 0, 48),
"ethernet_type": HField(12, 0, 16)
}
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arp_hwtype_ethernet = 0x0001
arp_proto_ip = 0x0800
arp_opcode_request = 0x0001
arp_opcode_reply = 0x0002
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arp_header_len = 28
arp_header = {
"hwtype": HField( 0, 0, 16),
"proto": HField( 2, 0, 16),
"hwsize": HField( 4, 0, 8),
"protosize": HField( 5, 0, 8),
"opcode": HField( 6, 0, 16),
"sender_mac": HField( 8, 0, 48),
"sender_ip": HField(14, 0, 32),
"target_mac": HField(18, 0, 48),
"target_ip": HField(24, 0, 32)
}
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ipv4_header_len = 20
ipv4_header = {
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"ihl": HField(0, 0, 4),
"version": HField(0, 4, 4),
"total_length": HField(2, 0, 16),
"identification": HField(4, 0, 16),
"ttl": HField(8, 0, 8),
"protocol": HField(9, 0, 8),
"checksum": HField(10, 0, 16),
"sender_ip": HField(12, 0, 32),
"target_ip": HField(16, 0, 32)
}
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icmp_header_len = 8
icmp_header = {
"msgtype": HField( 0, 0, 8),
"code": HField( 1, 0, 8),
"checksum": HField( 2, 0, 16),
"quench": HField( 4, 0, 32)
}
icmp_protocol = 0x01
udp_header_len = 8
udp_header = {
"src_port": HField( 0, 0, 16),
"dst_port": HField( 2, 0, 16),
"length": HField( 4, 0, 16),
"checksum": HField( 6, 0, 16)
}
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udp_protocol = 0x11
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etherbone_magic = 0x4e6f
etherbone_version = 1
etherbone_header_len = 8
etherbone_header = {
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"magic": HField( 0, 0, 16),
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"version": HField( 2, 4, 4),
"nr": HField( 2, 2, 1),
"pr": HField( 2, 1, 1),
"pf": HField( 2, 0, 1),
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"addr_size": HField( 3, 4, 4),
"port_size": HField( 3, 0, 4)
}
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etherbone_record_header_len = 4
etherbone_record_header = {
"bca": HField( 0, 0, 1),
"rca": HField( 0, 1, 1),
"rff": HField( 0, 2, 1),
"cyc": HField( 0, 4, 1),
"wca": HField( 0, 5, 1),
"wff": HField( 0, 6, 1),
"byte_enable": HField( 1, 0, 8),
"wcount": HField( 2, 0, 8),
"rcount": HField( 3, 0, 8)
}
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def reverse_bytes(v):
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n = math.ceil(flen(v)/8)
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r = []
for i in reversed(range(n)):
r.append(v[i*8:min((i+1)*8, flen(v))])
return Cat(iter(r))
# layouts
def _layout_from_header(header):
_layout = []
for k, v in sorted(header.items()):
_layout.append((k, v.width))
return _layout
def eth_phy_description(dw):
payload_layout = [
("data", dw),
("last_be", dw//8),
("error", dw//8)
]
return EndpointDescription(payload_layout, packetized=True)
def eth_mac_description(dw):
payload_layout = _layout_from_header(mac_header) + [
("data", dw),
("last_be", dw//8),
("error", dw//8)
]
return EndpointDescription(payload_layout, packetized=True)
def eth_arp_description(dw):
payload_layout = [
("data", dw),
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("error", dw//8)
]
param_layout = _layout_from_header(arp_header)
return EndpointDescription(payload_layout, param_layout, packetized=True)
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arp_table_request_layout = [
("ip_address", 32)
]
arp_table_response_layout = [
("failed", 1),
("mac_address", 48)
]
def eth_ipv4_description(dw):
payload_layout = [
("data", dw),
("error", dw//8)
]
param_layout = _layout_from_header(ipv4_header)
return EndpointDescription(payload_layout, param_layout, packetized=True)
def eth_ipv4_user_description(dw):
payload_layout = [
("data", dw),
("error", dw//8)
]
param_layout = [
("length", 16),
("protocol", 8),
("ip_address", 32)
]
return EndpointDescription(payload_layout, param_layout, packetized=True)
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def convert_ip(s):
ip = 0
for e in s.split("."):
ip = ip << 8
ip += int(e)
return ip
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def eth_icmp_description(dw):
payload_layout = [
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("data", dw),
("error", dw//8)
]
param_layout = _layout_from_header(icmp_header)
return EndpointDescription(payload_layout, param_layout, packetized=True)
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def eth_icmp_user_description(dw):
payload_layout = [
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("data", dw),
("error", dw//8)
]
param_layout = _layout_from_header(icmp_header) + [
("ip_address", 32),
("length", 16)
]
return EndpointDescription(payload_layout, param_layout, packetized=True)
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def eth_udp_description(dw):
payload_layout = [
("data", dw),
("error", dw//8)
]
param_layout = _layout_from_header(udp_header)
return EndpointDescription(payload_layout, param_layout, packetized=True)
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def eth_udp_user_description(dw):
payload_layout = [
("data", dw),
("error", dw//8)
]
param_layout = [
("src_port", 16),
("dst_port", 16),
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("ip_address", 32),
("length", 16)
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]
return EndpointDescription(payload_layout, param_layout, packetized=True)
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def eth_etherbone_description(dw):
payload_layout = [
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("data", dw),
("error", dw//8)
]
param_layout = _layout_from_header(etherbone_header)
return EndpointDescription(payload_layout, param_layout, packetized=True)
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def eth_etherbone_description(dw):
payload_layout = [
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("data", dw),
("error", dw//8)
]
param_layout = _layout_from_header(etherbone_header)
return EndpointDescription(payload_layout, param_layout, packetized=True)
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def eth_etherbone_user_description(dw):
payload_layout = [
("data", dw),
("error", dw//8)
]
param_layout = [
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("length", 16),
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("ip_address", 32),
("wcount", 8),
("rcount", 8)
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]
return EndpointDescription(payload_layout, param_layout, packetized=True)
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# Generic classes
class Port:
def connect(self, port):
r = [
Record.connect(self.source, port.sink),
Record.connect(port.source, self.sink)
]
return r
# Generic modules
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@DecorateModule(InsertReset)
@DecorateModule(InsertCE)
class FlipFlop(Module):
def __init__(self, *args, **kwargs):
self.d = Signal(*args, **kwargs)
self.q = Signal(*args, **kwargs)
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self.sync += self.q.eq(self.d)
@DecorateModule(InsertReset)
@DecorateModule(InsertCE)
class Counter(Module):
def __init__(self, signal=None, **kwargs):
if signal is None:
self.value = Signal(**kwargs)
else:
self.value = signal
self.width = flen(self.value)
self.sync += self.value.eq(self.value+1)
@DecorateModule(InsertReset)
@DecorateModule(InsertCE)
class Timeout(Module):
def __init__(self, length):
self.reached = Signal()
###
value = Signal(max=length)
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self.sync += If(~self.reached, value.eq(value+1))
self.comb += self.reached.eq(value == (length-1))
class BufferizeEndpoints(ModuleDecorator):
def __init__(self, submodule, *args):
ModuleDecorator.__init__(self, submodule)
endpoints = get_endpoints(submodule)
sinks = {}
sources = {}
for name, endpoint in endpoints.items():
if name in args or len(args) == 0:
if isinstance(endpoint, Sink):
sinks.update({name : endpoint})
elif isinstance(endpoint, Source):
sources.update({name : endpoint})
# add buffer on sinks
for name, sink in sinks.items():
buf = Buffer(sink.description)
self.submodules += buf
setattr(self, name, buf.d)
self.comb += Record.connect(buf.q, sink)
# add buffer on sources
for name, source in sources.items():
buf = Buffer(source.description)
self.submodules += buf
self.comb += Record.connect(source, buf.d)
setattr(self, name, buf.q)
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class EndpointPacketStatus(Module):
def __init__(self, endpoint):
self.start = Signal()
self.done = Signal()
self.ongoing = Signal()
ongoing = Signal()
self.comb += [
self.start.eq(endpoint.stb & endpoint.sop & endpoint.ack),
self.done.eq(endpoint.stb & endpoint.eop & endpoint.ack)
]
self.sync += \
If(self.start,
ongoing.eq(1)
).Elif(self.done,
ongoing.eq(0)
)
self.comb += self.ongoing.eq((self.start | ongoing) & ~self.done)
class PacketBuffer(Module):
def __init__(self, description, data_depth, cmd_depth=4, almost_full=None):
self.sink = sink = Sink(description)
self.source = source = Source(description)
###
sink_status = EndpointPacketStatus(self.sink)
source_status = EndpointPacketStatus(self.source)
self.submodules += sink_status, source_status
# store incoming packets
# cmds
def cmd_description():
layout = [("error", 1)]
return EndpointDescription(layout)
cmd_fifo = SyncFIFO(cmd_description(), cmd_depth)
self.submodules += cmd_fifo
self.comb += [
cmd_fifo.sink.stb.eq(sink_status.done),
cmd_fifo.sink.error.eq(sink.error)
]
# data
data_fifo = SyncFIFO(description, data_depth, buffered=True)
self.submodules += data_fifo
self.comb += [
Record.connect(self.sink, data_fifo.sink),
data_fifo.sink.stb.eq(self.sink.stb & cmd_fifo.sink.ack),
self.sink.ack.eq(data_fifo.sink.ack & cmd_fifo.sink.ack),
]
# output packets
self.fsm = fsm = FSM(reset_state="IDLE")
self.submodules += fsm
fsm.act("IDLE",
If(cmd_fifo.source.stb,
NextState("SEEK_SOP")
)
)
fsm.act("SEEK_SOP",
If(~data_fifo.source.sop,
data_fifo.source.ack.eq(1)
).Else(
NextState("OUTPUT")
)
)
fsm.act("OUTPUT",
Record.connect(data_fifo.source, self.source),
self.source.error.eq(cmd_fifo.source.error),
If(source_status.done,
cmd_fifo.source.ack.eq(1),
NextState("IDLE")
)
)
# compute almost full
if almost_full is not None:
self.almost_full = Signal()
self.comb += self.almost_full.eq(data_fifo.fifo.level > almost_full)