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#
# Copyright 2017 Ettus Research (National Instruments)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""
Ethernet dispatcher table control
"""
from builtins import str
from builtins import object
import netaddr
from .mpmlog import get_logger
from .uio import UIO
from .net import get_mac_addr
class EthDispatcherTable(object):
"""
Controls an Ethernet dispatcher table.
"""
DEFAULT_VITA_PORT = (49153, 49154)
# Address offsets:
OWN_IP_OFFSET = 0x0000
OWN_PORT_OFFSET = (0x0004, 0x0008)
SID_IP_OFFSET = 0x1000
SID_PORT_MAC_HI_OFFSET = 0x1400
SID_MAC_LO_OFFSET = 0x1800
def __init__(self, label):
self.log = get_logger(label)
self._regs = UIO(label=label, read_only=False)
self.poke32 = self._regs.poke32
self.peek32 = self._regs.peek32
def set_ipv4_addr(self, ip_addr):
"""
Set the own IPv4 address for this Ethernet dispatcher.
Outgoing packets will have this IP address.
"""
self.log.debug("Setting my own IP address to `{}'".format(ip_addr))
ip_addr_int = int(netaddr.IPAddress(ip_addr))
self.poke32(self.OWN_IP_OFFSET, ip_addr_int)
def set_vita_port(self, port_value=None, port_idx=None):
"""
Set the port that is used for incoming VITA traffic. This is used to
distinguish traffic that goes to the FPGA from that going to the ARM.
"""
port_idx = port_idx or 0
port_value = port_value or self.DEFAULT_VITA_PORT[port_idx]
assert port_idx in (0, 1)
port_reg_addr = self.OWN_PORT_OFFSET[port_idx]
self.poke32(port_reg_addr, port_value)
def set_route(self, sid, ip_addr, udp_port, mac_addr=None):
"""
Sets up routing in the Ethernet dispatcher. From sid, only the
destination part is important. After this call, any CHDR packet
reaching this Ethernet dispatcher will get routed to `ip_addr' and
`udp_port'.
It automatically looks up the MAC address of the destination unless a
MAC address is given.
sid -- Full SID, but only destination part matters.
ip_addr -- IPv4 destination address. String format ("1.2.3.4").
udp_addr -- Destination UDP port.
mac_addr -- If given, this will replace an ARP lookup for the MAC
address. String format, ("aa:bb:cc:dd:ee:ff"), case does
not matter.
"""
udp_port = int(udp_port)
if mac_addr is None:
mac_addr = get_mac_addr(ip_addr)
if mac_addr is None:
self.log.error(
"Could not resolve a MAC address for IP address `{}'".format(ip_addr)
)
dst_ep = sid.dst_ep
self.log.debug(
"Routing SID `{sid}' (endpoint `{ep}') to IP address `{ip}', " \
"MAC address `{mac}', port `{port}'".format(
sid=str(sid),
ep=dst_ep,
ip=ip_addr,
mac=mac_addr,
port=udp_port
)
)
ip_addr_int = int(netaddr.IPAddress(ip_addr))
mac_addr_int = int(netaddr.EUI(mac_addr))
sid_offset = 4 * dst_ep
def poke_and_trace(addr, data):
" Do a poke32() and log.trace() "
self.log.trace("Writing to address 0x{:04X}: 0x{:04X}".format(
addr, data
))
self.poke32(addr, data)
poke_and_trace(
self.SID_IP_OFFSET + sid_offset,
ip_addr_int
)
poke_and_trace(
self.SID_MAC_LO_OFFSET + sid_offset,
mac_addr_int & 0xFFFFFFFF,
)
poke_and_trace(
self.SID_PORT_MAC_HI_OFFSET + sid_offset,
(udp_port << 16) | (mac_addr_int >> 32)
)
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