376 lines
12 KiB
Python
376 lines
12 KiB
Python
"""
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Copyright (c) 2020 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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import logging
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import struct
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import zlib
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from collections import deque
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import cocotb
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from cocotb.triggers import RisingEdge, ReadOnly, Timer, First, Event
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from cocotb.utils import get_sim_time
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from .version import __version__
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from .constants import EthPre, ETH_PREAMBLE, XgmiiCtrl
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class XgmiiFrame(object):
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def __init__(self, data=None, ctrl=None):
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self.data = bytearray()
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self.ctrl = None
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self.rx_sim_time = None
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self.rx_start_lane = None
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if type(data) is XgmiiFrame:
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self.data = bytearray(data.data)
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self.ctrl = data.ctrl
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self.rx_sim_time = data.rx_sim_time
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self.rx_start_lane = data.rx_start_lane
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else:
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self.data = bytearray(data)
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self.ctrl = ctrl
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@classmethod
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def from_payload(cls, payload, add_fcs=True):
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data = bytearray(ETH_PREAMBLE)
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data.extend(payload)
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if add_fcs:
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data.extend(struct.pack('<L', zlib.crc32(payload)))
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return cls(data)
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def get_preamble_len(self):
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return self.data.index(EthPre.SFD)+1
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def get_preamble(self):
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return self.data[0:self.get_preamble_len()]
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def get_payload(self, strip_fcs=True):
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if strip_fcs:
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return self.data[self.get_preamble_len():-4]
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else:
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return self.data[self.get_preamble_len():]
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def get_fcs(self):
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return self.data[-4:]
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def check_fcs(self):
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return self.get_fcs() == struct.pack('<L', zlib.crc32(self.get_payload(strip_fcs=True)))
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def normalize(self):
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n = len(self.data)
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if self.ctrl is not None:
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self.ctrl = self.ctrl[:n] + [self.ctrl[-1]]*(n-len(self.ctrl))
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else:
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self.ctrl = [0]*n
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def compact(self):
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if not any(self.ctrl):
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self.ctrl = None
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def __eq__(self, other):
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if type(other) is XgmiiFrame:
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return self.data == other.data
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def __repr__(self):
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return (
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f"{type(self).__name__}(data={repr(self.data)}, "
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f"ctrl={repr(self.ctrl)}, "
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f"rx_sim_time={repr(self.rx_sim_time)}, "
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f"rx_start_lane={repr(self.rx_start_lane)})"
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)
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def __len__(self):
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return len(self.data)
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def __iter__(self):
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return self.data.__iter__()
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class XgmiiSource(object):
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def __init__(self, data, ctrl, clock, reset=None, enable=None, *args, **kwargs):
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self.log = logging.getLogger(f"cocotb.{data._path}")
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self.data = data
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self.ctrl = ctrl
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self.clock = clock
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self.reset = reset
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self.enable = enable
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self.log.info("XGMII source")
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self.log.info("cocotbext-eth version %s", __version__)
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self.log.info("Copyright (c) 2020 Alex Forencich")
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self.log.info("https://github.com/alexforencich/cocotbext-eth")
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super().__init__(*args, **kwargs)
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self.active = False
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self.queue = deque()
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self.enable_dic = True
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self.ifg = 12
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self.force_offset_start = False
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self.queue_occupancy_bytes = 0
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self.queue_occupancy_frames = 0
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self.width = len(self.data)
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self.byte_width = len(self.ctrl)
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self.reset = reset
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assert self.width == self.byte_width * 8
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self.idle_d = 0
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self.idle_c = 0
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for k in range(self.byte_width):
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self.idle_d |= XgmiiCtrl.IDLE << k*8
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self.idle_c |= 1 << k
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self.data.setimmediatevalue(0)
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self.ctrl.setimmediatevalue(0)
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cocotb.fork(self._run())
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def send(self, frame):
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frame = XgmiiFrame(frame)
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self.queue_occupancy_bytes += len(frame)
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self.queue_occupancy_frames += 1
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self.queue.append(frame)
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def count(self):
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return len(self.queue)
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def empty(self):
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return not self.queue
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def idle(self):
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return self.empty() and not self.active
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async def wait(self):
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while not self.idle():
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await RisingEdge(self.clock)
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async def _run(self):
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frame = None
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ifg_cnt = 0
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deficit_idle_cnt = 0
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self.active = False
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while True:
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await ReadOnly()
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if self.reset is not None and self.reset.value:
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await RisingEdge(self.clock)
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frame = None
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ifg_cnt = 0
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deficit_idle_cnt = 0
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self.active = False
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self.data <= 0
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self.ctrl <= 0
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continue
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await RisingEdge(self.clock)
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if self.enable is None or self.enable.value:
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if ifg_cnt + deficit_idle_cnt > self.byte_width-1 or (not self.enable_dic and ifg_cnt > 4):
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# in IFG
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ifg_cnt = ifg_cnt - self.byte_width
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if ifg_cnt < 0:
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if self.enable_dic:
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deficit_idle_cnt = max(deficit_idle_cnt+ifg_cnt, 0)
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ifg_cnt = 0
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elif frame is None:
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# idle
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if self.queue:
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# send frame
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frame = self.queue.popleft()
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self.queue_occupancy_bytes -= len(frame)
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self.queue_occupancy_frames -= 1
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self.log.info("TX frame: %s", frame)
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frame.normalize()
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assert frame.data[0] == EthPre.PRE
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assert frame.ctrl[0] == 0
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frame.data[0] = XgmiiCtrl.START
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frame.ctrl[0] = 1
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frame.data.append(XgmiiCtrl.TERM)
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frame.ctrl.append(1)
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# offset start
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if self.enable_dic:
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min_ifg = 3 - deficit_idle_cnt
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else:
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min_ifg = 0
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if self.byte_width > 4 and (ifg_cnt > min_ifg or self.force_offset_start):
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ifg_cnt = ifg_cnt-4
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frame.data = bytearray([XgmiiCtrl.IDLE]*4)+frame.data
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frame.ctrl = [1]*4+frame.ctrl
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if self.enable_dic:
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deficit_idle_cnt = max(deficit_idle_cnt+ifg_cnt, 0)
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ifg_cnt = 0
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self.active = True
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else:
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# clear counters
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deficit_idle_cnt = 0
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ifg_cnt = 0
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if frame is not None:
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d_val = 0
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c_val = 0
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for k in range(self.byte_width):
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if frame is not None:
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d_val |= frame.data.pop(0) << k*8
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c_val |= frame.ctrl.pop(0) << k
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if not frame.data:
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ifg_cnt = max(self.ifg - (self.byte_width-k), 0)
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frame = None
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else:
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d_val |= XgmiiCtrl.IDLE << k*8
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c_val |= 1 << k
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self.data <= d_val
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self.ctrl <= c_val
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else:
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self.data <= self.idle_d
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self.ctrl <= self.idle_c
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self.active = False
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class XgmiiSink(object):
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def __init__(self, data, ctrl, clock, reset=None, enable=None, *args, **kwargs):
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self.log = logging.getLogger(f"cocotb.{data._path}")
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self.data = data
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self.ctrl = ctrl
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self.clock = clock
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self.reset = reset
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self.enable = enable
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self.log.info("XGMII sink")
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self.log.info("cocotbext-eth version %s", __version__)
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self.log.info("Copyright (c) 2020 Alex Forencich")
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self.log.info("https://github.com/alexforencich/cocotbext-eth")
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super().__init__(*args, **kwargs)
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self.active = False
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self.queue = deque()
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self.sync = Event()
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self.queue_occupancy_bytes = 0
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self.queue_occupancy_frames = 0
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self.width = len(self.data)
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self.byte_width = len(self.ctrl)
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self.reset = reset
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assert self.width == self.byte_width * 8
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cocotb.fork(self._run())
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def recv(self):
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if self.queue:
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frame = self.queue.popleft()
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self.queue_occupancy_bytes -= len(frame)
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self.queue_occupancy_frames -= 1
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return frame
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return None
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def count(self):
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return len(self.queue)
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def empty(self):
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return not self.queue
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def idle(self):
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return not self.active
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async def wait(self, timeout=0, timeout_unit=None):
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if not self.empty():
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return
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self.sync.clear()
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if timeout:
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await First(self.sync.wait(), Timer(timeout, timeout_unit))
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else:
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await self.sync.wait()
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async def _run(self):
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frame = None
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self.active = False
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while True:
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await ReadOnly()
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if self.reset is not None and self.reset.value:
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await RisingEdge(self.clock)
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frame = None
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self.active = False
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continue
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if self.enable is None or self.enable.value:
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for offset in range(self.byte_width):
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d_val = (self.data.value.integer >> (offset*8)) & 0xff
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c_val = (self.ctrl.value.integer >> offset) & 1
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if frame is None:
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if c_val and d_val == XgmiiCtrl.START:
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# start
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frame = XgmiiFrame(bytearray([EthPre.PRE]), [0])
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frame.rx_sim_time = get_sim_time()
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frame.rx_start_lane = offset
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else:
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if c_val:
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# got a control character; terminate frame reception
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if d_val != XgmiiCtrl.TERM:
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# store control character if it's not a termination
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frame.data.append(d_val)
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frame.ctrl.append(c_val)
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frame.compact()
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self.log.info("RX frame: %s", frame)
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self.queue_occupancy_bytes += len(frame)
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self.queue_occupancy_frames += 1
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self.queue.append(frame)
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self.sync.set()
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frame = None
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else:
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frame.data.append(d_val)
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frame.ctrl.append(c_val)
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await RisingEdge(self.clock)
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class XgmiiMonitor(XgmiiSink):
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pass
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