48 lines
1.3 KiB
Python
48 lines
1.3 KiB
Python
from misoclib.liteeth.common import *
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from misoclib.liteeth.generic import *
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class LiteEthMACPaddingInserter(Module):
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def __init__(self, dw, packet_min_length):
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self.sink = sink = Sink(eth_phy_description(dw))
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self.source = source = Source(eth_phy_description(dw))
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###
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packet_min_data = math.ceil(packet_min_length/(dw/8))
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self.submodules.counter = counter = Counter(max=eth_mtu)
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self.submodules.fsm = fsm = FSM(reset_state="COPY")
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fsm.act("COPY",
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counter.reset.eq(sink.stb & sink.sop),
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Record.connect(sink, source),
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If(sink.stb & sink.ack,
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counter.ce.eq(1),
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If(sink.eop,
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If(counter.value < (packet_min_data-1),
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source.eop.eq(0),
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NextState("PADDING")
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)
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)
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)
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)
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fsm.act("PADDING",
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source.stb.eq(1),
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source.eop.eq(counter.value == (packet_min_data-1)),
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source.data.eq(0),
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If(source.ack,
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counter.ce.eq(1),
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If(source.eop,
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NextState("COPY")
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)
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)
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)
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class LiteEthMACPaddingChecker(Module):
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def __init__(self, dw, packet_min_length):
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self.sink = sink = Sink(eth_phy_description(dw))
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self.source = source = Source(eth_phy_description(dw))
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###
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# XXX see if we should drop the packet when
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# payload size < minimum ethernet payload size
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self.comb += Record.connect(sink, source)
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