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#
# Copyright 2017 Ettus Research, National Instruments Company
#
# SPDX-License-Identifier: GPL-3.0
#
"""
UDP Transport manager
"""
from builtins import object
from six import iteritems, itervalues
from usrp_mpm.ethtable import EthDispatcherTable
from usrp_mpm.sys_utils import net
from usrp_mpm.mpmtypes import SID
from usrp_mpm import lib
class XportMgrUDP(object):
"""
Transport manager for UDP connections
"""
# The interface configuration describes how the Ethernet interfaces are
# hooked up to the crossbar and the FPGA. It could look like this:
# iface_config = {
# 'eth1': { # Add key for every Ethernet iface connected to the FPGA
# 'label': 'misc-enet-regs0', # UIO label for the Eth table
# 'xbar': 0, # Which crossbar? 0 -> /dev/crossbar0
# 'xbar_port': 0, # Which port on the crossbar it is connected to
# },
# }
iface_config = {}
# The control addresses are typically addresses bound to the controlling
# UHD session. When the requested source address is below or equal to this
# number, we override requested SID source addresses based on other logic.
max_ctrl_addr = 1
def __init__(self, log):
assert len(self.iface_config)
assert all((
all((key in x for key in ('label', 'xbar', 'xbar_port')))
for x in itervalues(self.iface_config)
))
self.log = log
self.log.trace("Initializing UDP xport manager...")
self._possible_chdr_ifaces = self.iface_config.keys()
self.log.trace("Identifying available network interfaces...")
self.chdr_port = EthDispatcherTable.DEFAULT_VITA_PORT[0]
self._chdr_ifaces = \
self._init_interfaces(self._possible_chdr_ifaces)
self._eth_dispatchers = {}
self._allocations = {}
def _init_interfaces(self, possible_ifaces):
"""
Enumerate all network interfaces that are currently able to stream CHDR
Returns a dictionary iface name -> iface info, where iface info is the
return value of get_iface_info().
"""
self.log.trace("Testing available interfaces out of `{}'".format(
list(possible_ifaces)
))
valid_ifaces = net.get_valid_interfaces(possible_ifaces)
if len(valid_ifaces):
self.log.debug("Found CHDR interfaces: `{}'".format(valid_ifaces))
else:
self.log.warning("No CHDR interfaces found!")
return {
x: net.get_iface_info(x)
for x in valid_ifaces
}
def _update_dispatchers(self):
"""
Updates the self._eth_dispatchers dictionary, makes sure that all IP
addresses are programmed correctly.
After calling this, _chdr_ifaces and _eth_dispatchers are in sync.
"""
ifaces_to_remove = [
x for x in self._eth_dispatchers.keys()
if x not in self._chdr_ifaces
]
for iface in ifaces_to_remove:
self._eth_dispatchers.pop(iface)
for iface in self._chdr_ifaces:
if iface not in self._eth_dispatchers:
self._eth_dispatchers[iface] = \
EthDispatcherTable(self.iface_config[iface]['label'])
self._eth_dispatchers[iface].set_ipv4_addr(
self._chdr_ifaces[iface]['ip_addr']
)
def init(self, args):
"""
Call this when the user calls 'init' on the periph manager
"""
self._chdr_ifaces = \
self._init_interfaces(self._possible_chdr_ifaces)
self._update_dispatchers()
for _, table in iteritems(self._eth_dispatchers):
if 'forward_eth' in args or 'forward_bcast' in args:
table.set_forward_policy(
args.get('forward_eth', False),
args.get('forward_bcast', False)
)
if 'preload_ethtables' in args:
self._preload_ethtables(
self._eth_dispatchers,
args['preload_ethtables']
)
def deinit(self):
" Clean up after a session terminates "
self._allocations = {}
def _preload_ethtables(self, eth_dispatchers, table_file):
"""
Populates the ethernet tables from a JSON file
"""
import json
try:
eth_table_data = json.load(open(table_file))
except ValueError as ex:
self.log.warning(
"Bad values in preloading table file: %s",
str(ex)
)
return
self.log.info(
"Preloading Ethernet dispatch tables from JSON file `%s'.",
table_file
)
for eth_iface, data in iteritems(eth_table_data):
if eth_iface not in eth_dispatchers:
self.log.warning(
"Request to preload eth dispatcher table for "
"iface `{}', but no such interface is "
"registered. Known interfaces: {}".format(
str(eth_iface),
",".join(eth_dispatchers.keys())
)
)
continue
eth_dispatcher = eth_dispatchers[eth_iface]
self.log.debug("Preloading {} dispatch table".format(eth_iface))
try:
for dst_ep, udp_data in iteritems(data):
sid = SID()
sid.set_dst_ep(int(dst_ep))
eth_dispatcher.set_route(
sid,
udp_data['ip_addr'],
udp_data['port'],
udp_data.get('mac_addr', None)
)
except ValueError as ex:
self.log.warning(
"Bad values in preloading table file: %s",
str(ex)
)
def get_xbar_dev(self, iface):
"""
Given an Ethernet interface (e.g., 'eth1') returns the crossbar device
it is connected to.
"""
xbar_idx = self.iface_config[iface]['xbar']
return "/dev/crossbar{}".format(xbar_idx)
def request_xport(
self,
sid,
xport_type,
):
"""
Return UDP xport info
"""
def fixup_sid(sid, iface_name):
" Modify the source SID (e.g. the UHD SID) "
if sid.src_addr <= self.max_ctrl_addr:
sid.src_addr = self.iface_config[iface_name]['ctrl_src_addr']
return sid
assert xport_type in ('CTRL', 'ASYNC_MSG', 'TX_DATA', 'RX_DATA')
allocation_getter = lambda iface: {
'CTRL': 0,
'ASYNC_MSG': 0,
'RX_DATA': self._allocations.get(iface, {}).get('rx', 0),
'TX_DATA': self._allocations.get(iface, {}).get('tx', 0),
}[xport_type]
xport_info = sorted([
{
'type': 'UDP',
'ipv4': str(iface_info['ip_addr']),
'port': str(self.chdr_port),
'send_sid': str(fixup_sid(sid, iface_name)),
'allocation': str(allocation_getter(iface_name)),
'xport_type': xport_type,
}
for iface_name, iface_info in iteritems(self._chdr_ifaces)
], key=lambda x: int(x['allocation']), reverse=False)
return xport_info
def commit_xport(self, sid, xport_info):
"""
fuu
"""
self.log.trace("Sanity checking xport_info %s...", str(xport_info))
assert xport_info['type'] == 'UDP'
assert any([xport_info['ipv4'] == x['ip_addr']
for x in itervalues(self._chdr_ifaces)])
assert xport_info['port'] == str(self.chdr_port)
assert len(xport_info.get('src_ipv4')) > 5
assert int(xport_info.get('src_port')) > 0
sender_addr = xport_info['src_ipv4']
sender_port = int(xport_info['src_port'])
self.log.trace("Incoming connection is coming from %s:%d",
sender_addr, sender_port)
mac_addr = net.get_mac_addr(sender_addr)
if mac_addr is None:
raise RuntimeError(
"Could not find MAC address for IP address {}".format(
sender_addr))
self.log.trace("Incoming connection is coming from %s",
mac_addr)
eth_iface = net.ip_addr_to_iface(xport_info['ipv4'], self._chdr_ifaces)
xbar_port = self.iface_config[eth_iface]['xbar_port']
self.log.trace("Using Ethernet interface %s, crossbar port %d",
eth_iface, xbar_port)
xbar_iface = lib.xbar.xbar.make(self.get_xbar_dev(eth_iface))
xbar_iface.set_route(sid.src_addr, xbar_port)
self._eth_dispatchers[eth_iface].set_route(
sid.reversed(), sender_addr, sender_port)
self.log.trace("UDP transport successfully committed!")
if xport_info.get('xport_type') == 'TX_DATA':
self._allocations[eth_iface] = \
{'tx': self._allocations.get(eth_iface, {}).get('tx', 0) + 1}
if xport_info.get('xport_type') == 'RX_DATA':
self._allocations[eth_iface] = \
{'rx': self._allocations.get(eth_iface, {}).get('rx', 0) + 1}
self.log.trace(
"New link allocations for %s: TX: %d RX: %d",
eth_iface,
self._allocations.get(eth_iface, {}).get('tx', 0),
self._allocations.get(eth_iface, {}).get('rx', 0),
)
return True
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