import math
from collections import OrderedDict

from migen.fhdl.std import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from migen.genlib.record import *
from migen.genlib.fsm import FSM, NextState
from migen.genlib.misc import chooser, reverse_bytes, FlipFlop, Counter, WaitTimer
from migen.flow.actor import *
from migen.actorlib.structuring import Converter, Pipeline
from migen.actorlib.fifo import SyncFIFO, AsyncFIFO
from migen.actorlib.packet import *
from migen.bank.description import *

class Port:
    def connect(self, port):
        r = [
            Record.connect(self.source, port.sink),
            Record.connect(port.source, self.sink)
        ]
        return r

eth_mtu = 1532
eth_min_len = 46
eth_interpacket_gap = 12
eth_preamble = 0xD555555555555555
buffer_depth = 2**log2_int(eth_mtu, need_pow2=False)

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 = mac_header.get_layout() + [
        ("data", dw),
        ("last_be", dw//8),
        ("error", dw//8)
    ]
    return EndpointDescription(payload_layout, packetized=True)