mirror of
https://github.com/alexforencich/verilog-ethernet.git
synced 2025-01-14 06:43:18 +08:00
260 lines
9.7 KiB
Python
260 lines
9.7 KiB
Python
"""
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Copyright (c) 2014 Alex Forencich
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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"""
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from myhdl import *
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import axis_ep
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from Queue import Queue
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import struct
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import zlib
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class EthFrame(object):
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def __init__(self, payload=b'', eth_dest_mac=0, eth_src_mac=0, eth_type=0, eth_fcs=None):
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self._payload = axis_ep.AXIStreamFrame()
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self.eth_dest_mac = eth_dest_mac
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self.eth_src_mac = eth_src_mac
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self.eth_type = eth_type
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self.eth_fcs = eth_fcs
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if type(payload) is dict:
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self.payload = axis_ep.AXIStreamFrame(payload['eth_payload'])
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self.eth_dest_mac = payload['eth_dest_mac']
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self.eth_src_mac = payload['eth_src_mac']
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self.eth_type = payload['eth_type']
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self.eth_fcs = payload['eth_fcs']
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if type(payload) is bytes:
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payload = bytearray(payload)
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if type(payload) is bytearray or type(payload) is axis_ep.AXIStreamFrame:
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self.payload = axis_ep.AXIStreamFrame(payload)
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if type(payload) is EthFrame:
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self.payload = axis_ep.AXIStreamFrame(payload.payload)
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self.eth_dest_mac = payload.eth_dest_mac
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self.eth_src_mac = payload.eth_src_mac
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self.eth_type = payload.eth_type
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self.eth_fcs = payload.eth_fcs
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@property
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def payload(self):
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return self._payload
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@payload.setter
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def payload(self, value):
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self._payload = axis_ep.AXIStreamFrame(value)
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def calc_fcs(self):
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frame = self.build_axis().data
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return zlib.crc32(bytes(frame)) & 0xffffffff
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def update_fcs(self):
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self.eth_fcs = self.calc_fcs()
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def build_axis(self):
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data = b''
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data += struct.pack('>Q', self.eth_dest_mac)[2:]
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data += struct.pack('>Q', self.eth_src_mac)[2:]
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data += struct.pack('>H', self.eth_type)
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data += self.payload.data
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return axis_ep.AXIStreamFrame(data)
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def build_axis_fcs(self):
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if self.eth_fcs is None:
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self.update_fcs()
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data = self.build_axis().data
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data += struct.pack('<L', self.eth_fcs)
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return axis_ep.AXIStreamFrame(data)
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def parse_axis(self, data):
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data = axis_ep.AXIStreamFrame(data).data
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self.eth_dest_mac = struct.unpack('>Q', '\x00\x00'+data[0:6])[0]
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self.eth_src_mac = struct.unpack('>Q', '\x00\x00'+data[6:12])[0]
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self.eth_type = struct.unpack('>H', data[12:14])[0]
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data = data[14:]
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self.payload = axis_ep.AXIStreamFrame(data)
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def parse_axis_fcs(self, data):
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self.parse_axis(data)
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data = self.payload.data
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self.payload = axis_ep.AXIStreamFrame(data[:-4])
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self.eth_fcs = struct.unpack('<L', data[-4:])[0]
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def __eq__(self, other):
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if type(other) is EthFrame:
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return (self.eth_src_mac == other.eth_src_mac and
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self.eth_dest_mac == other.eth_dest_mac and
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self.eth_type == other.eth_type and
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self.payload == other.payload)
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def __repr__(self):
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fcs = 'None'
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if self.eth_fcs is not None:
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fcs = '0x%08x' % self.eth_fcs
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return 'EthFrame(payload=%s, eth_dest_mac=0x%012x, eth_src_mac=0x%012x, eth_type=0x%04x, eth_fcs=%s)' % (repr(self.payload), self.eth_dest_mac, self.eth_src_mac, self.eth_type, fcs)
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def EthFrameSource(clk, rst,
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eth_hdr_valid=None,
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eth_hdr_ready=None,
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eth_dest_mac=Signal(intbv(0)[48:]),
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eth_src_mac=Signal(intbv(0)[48:]),
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eth_type=Signal(intbv(0)[16:]),
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eth_payload_tdata=None,
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eth_payload_tkeep=Signal(bool(True)),
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eth_payload_tvalid=Signal(bool(False)),
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eth_payload_tready=Signal(bool(True)),
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eth_payload_tlast=Signal(bool(False)),
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eth_payload_tuser=Signal(bool(False)),
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fifo=None,
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pause=0,
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name=None):
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eth_hdr_ready_int = Signal(bool(False))
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eth_hdr_valid_int = Signal(bool(False))
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eth_payload_pause = Signal(bool(False))
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eth_payload_fifo = Queue()
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eth_payload_source = axis_ep.AXIStreamSource(clk,
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rst,
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tdata=eth_payload_tdata,
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tkeep=eth_payload_tkeep,
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tvalid=eth_payload_tvalid,
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tready=eth_payload_tready,
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tlast=eth_payload_tlast,
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tuser=eth_payload_tuser,
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fifo=eth_payload_fifo,
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pause=eth_payload_pause)
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@always_comb
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def pause_logic():
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eth_hdr_ready_int.next = eth_hdr_ready and not pause
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eth_hdr_valid.next = eth_hdr_valid_int and not pause
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eth_payload_pause.next = pause # or eth_hdr_valid_int
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@instance
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def logic():
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frame = dict()
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while True:
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yield clk.posedge, rst.posedge
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if rst:
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eth_hdr_valid_int.next = False
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else:
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if eth_hdr_ready_int:
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eth_hdr_valid_int.next = False
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if (eth_payload_tlast and eth_hdr_ready_int and eth_hdr_valid) or not eth_hdr_valid_int:
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if not fifo.empty():
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frame = fifo.get()
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frame = EthFrame(frame)
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eth_dest_mac.next = frame.eth_dest_mac
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eth_src_mac.next = frame.eth_src_mac
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eth_type.next = frame.eth_type
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eth_payload_fifo.put(frame.payload)
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if name is not None:
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print("[%s] Sending frame %s" % (name, repr(frame)))
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eth_hdr_valid_int.next = True
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return logic, pause_logic, eth_payload_source
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def EthFrameSink(clk, rst,
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eth_hdr_valid=None,
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eth_hdr_ready=None,
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eth_dest_mac=Signal(intbv(0)[48:]),
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eth_src_mac=Signal(intbv(0)[48:]),
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eth_type=Signal(intbv(0)[16:]),
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eth_payload_tdata=None,
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eth_payload_tkeep=Signal(bool(True)),
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eth_payload_tvalid=Signal(bool(True)),
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eth_payload_tready=Signal(bool(True)),
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eth_payload_tlast=Signal(bool(True)),
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eth_payload_tuser=Signal(bool(False)),
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fifo=None,
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pause=0,
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name=None):
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eth_hdr_ready_int = Signal(bool(False))
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eth_hdr_valid_int = Signal(bool(False))
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eth_payload_pause = Signal(bool(False))
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eth_payload_fifo = Queue()
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eth_header_fifo = Queue()
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eth_payload_sink = axis_ep.AXIStreamSink(clk,
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rst,
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tdata=eth_payload_tdata,
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tkeep=eth_payload_tkeep,
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tvalid=eth_payload_tvalid,
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tready=eth_payload_tready,
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tlast=eth_payload_tlast,
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tuser=eth_payload_tuser,
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fifo=eth_payload_fifo,
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pause=eth_payload_pause)
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@always_comb
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def pause_logic():
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eth_hdr_ready.next = eth_hdr_ready_int and not pause
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eth_hdr_valid_int.next = eth_hdr_valid and not pause
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eth_payload_pause.next = pause # or eth_hdr_valid_int
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@instance
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def logic():
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frame = EthFrame()
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while True:
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yield clk.posedge, rst.posedge
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if rst:
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eth_hdr_ready_int.next = False
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frame = EthFrame()
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else:
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eth_hdr_ready_int.next = True
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if eth_hdr_ready_int and eth_hdr_valid_int:
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frame = EthFrame()
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frame.eth_dest_mac = int(eth_dest_mac)
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frame.eth_src_mac = int(eth_src_mac)
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frame.eth_type = int(eth_type)
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eth_header_fifo.put(frame)
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if not eth_payload_fifo.empty() and not eth_header_fifo.empty():
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frame = eth_header_fifo.get()
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frame.payload = eth_payload_fifo.get()
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fifo.put(frame)
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if name is not None:
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print("[%s] Got frame %s" % (name, repr(frame)))
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frame = dict()
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return logic, pause_logic, eth_payload_sink
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