Add VAT support for LB - vpp - Vector Packet Processing

about summary refs log tree commit diff stats

diff options

author	Hongjun Ni <hongjun.ni@intel.com>	2019-02-18 23:26:48 +0800
committer	Damjan Marion <dmarion@me.com>	2019-03-07 10:25:26 +0000
commit	313f1b9e5b964fc2e6f654576e2dd50a904846d6 (patch)
tree	baed47ac7694f51192fd5e782467a0deca2eca85 /src/plugins/cdp
parent	f8d2e860999784739a5ea99b7c1f97d19673256a (diff)

Add VAT support for LB

Change-Id: I61d8c35f48a059968909fc8523bd313fc4799389 Signed-off-by: Hongjun Ni <hongjun.ni@intel.com>

Diffstat (limited to 'src/plugins/cdp')

0 files changed, 0 insertions, 0 deletions

7' href='#n127'>127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721

#!/usr/bin/env python
#
# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

from __future__ import print_function
from __future__ import absolute_import
import sys
import os
import logging
import collections
import struct
import functools
import json
import threading
import fnmatch
import weakref
import atexit
from . vpp_serializer import VPPType, VPPEnumType, VPPUnionType, BaseTypes
from . vpp_serializer import VPPMessage, vpp_get_type, VPPTypeAlias
from . macaddress import MACAddress, mac_pton, mac_ntop

logger = logging.getLogger(__name__)

if sys.version[0] == '2':
    import Queue as queue
else:
    import queue as queue


def metaclass(metaclass):
    @functools.wraps(metaclass)
    def wrapper(cls):
        return metaclass(cls.__name__, cls.__bases__, cls.__dict__.copy())

    return wrapper


class VppEnumType(type):
    def __getattr__(cls, name):
        t = vpp_get_type(name)
        return t.enum


@metaclass(VppEnumType)
class VppEnum(object):
    pass


def vpp_atexit(vpp_weakref):
    """Clean up VPP connection on shutdown."""
    vpp_instance = vpp_weakref()
    if vpp_instance and vpp_instance.transport.connected:
        vpp_instance.logger.debug('Cleaning up VPP on exit')
        vpp_instance.disconnect()


if sys.version[0] == '2':
    def vpp_iterator(d):
        return d.iteritems()
else:
    def vpp_iterator(d):
        return d.items()


def call_logger(msgdef, kwargs):
    s = 'Calling {}('.format(msgdef.name)
    for k, v in kwargs.items():
        s += '{}:{} '.format(k, v)
    s += ')'
    return s


def return_logger(r):
    s = 'Return from {}'.format(r)
    return s


class VppApiDynamicMethodHolder(object):
    pass


class FuncWrapper(object):
    def __init__(self, func):
        self._func = func
        self.__name__ = func.__name__
        self.__doc__ = func.__doc__

    def __call__(self, **kwargs):
        return self._func(**kwargs)


class VPPApiError(Exception):
    pass


class VPPNotImplementedError(NotImplementedError):
    pass


class VPPIOError(IOError):
    pass


class VPPRuntimeError(RuntimeError):
    pass


class VPPValueError(ValueError):
    pass


class VPPApiClient(object):
    """VPP interface.

    This class provides the APIs to VPP.  The APIs are loaded
    from provided .api.json files and makes functions accordingly.
    These functions are documented in the VPP .api files, as they
    are dynamically created.

    Additionally, VPP can send callback messages; this class
    provides a means to register a callback function to receive
    these messages in a background thread.
    """
    apidir = None
    VPPApiError = VPPApiError
    VPPRuntimeError = VPPRuntimeError
    VPPValueError = VPPValueError
    VPPNotImplementedError = VPPNotImplementedError
    VPPIOError = VPPIOError

    def process_json_file(self, apidef_file):
        api = json.load(apidef_file)
        types = {}
        for t in api['enums']:
            t[0] = 'vl_api_' + t[0] + '_t'
            types[t[0]] = {'type': 'enum', 'data': t}
        for t in api['unions']:
            t[0] = 'vl_api_' + t[0] + '_t'
            types[t[0]] = {'type': 'union', 'data': t}
        for t in api['types']:
            t[0] = 'vl_api_' + t[0] + '_t'
            types[t[0]] = {'type': 'type', 'data': t}
        for t, v in api['aliases'].items():
            types['vl_api_' + t + '_t'] = {'type': 'alias', 'data': v}
        self.services.update(api['services'])

        i = 0
        while True:
            unresolved = {}
            for k, v in types.items():
                t = v['data']
                if not vpp_get_type(k):
                    if v['type'] == 'enum':
                        try:
                            VPPEnumType(t[0], t[1:])
                        except ValueError:
                            unresolved[k] = v
                    elif v['type'] == 'union':
                        try:
                            VPPUnionType(t[0], t[1:])
                        except ValueError:
                            unresolved[k] = v
                    elif v['type'] == 'type':
                        try:
                            VPPType(t[0], t[1:])
                        except ValueError:
                            unresolved[k] = v
                    elif v['type'] == 'alias':
                        try:
                            VPPTypeAlias(k, t)
                        except ValueError:
                            unresolved[k] = v
            if len(unresolved) == 0:
                break
            if i > 3:
                raise VPPValueError('Unresolved type definitions {}'
                                    .format(unresolved))
            types = unresolved
            i += 1

        for m in api['messages']:
            try:
                self.messages[m[0]] = VPPMessage(m[0], m[1:])
            except VPPNotImplementedError:
                self.logger.error('Not implemented error for {}'.format(m[0]))

    def __init__(self, apifiles=None, testmode=False, async_thread=True,
                 logger=None, loglevel=None,
                 read_timeout=5, use_socket=False,
                 server_address='/run/vpp-api.sock'):
        """Create a VPP API object.

        apifiles is a list of files containing API
        descriptions that will be loaded - methods will be
        dynamically created reflecting these APIs.  If not
        provided this will load the API files from VPP's
        default install location.

        logger, if supplied, is the logging logger object to log to.
        loglevel, if supplied, is the log level this logger is set
        to report at (from the loglevels in the logging module).
        """
        if logger is None:
            logger = logging.getLogger(__name__)
            if loglevel is not None:
                logger.setLevel(loglevel)
        self.logger = logger

        self.messages = {}
        self.services = {}
        self.id_names = []
        self.id_msgdef = []
        self.header = VPPType('header', [['u16', 'msgid'],
                                         ['u32', 'client_index']])
        self.apifiles = []
        self.event_callback = None
        self.message_queue = queue.Queue()
        self.read_timeout = read_timeout
        self.async_thread = async_thread
        self.event_thread = None

        if use_socket:
            from . vpp_transport_socket import VppTransport
        else:
            from . vpp_transport_shmem import VppTransport

        if not apifiles:
            # Pick up API definitions from default directory
            try:
                apifiles = self.find_api_files()
            except RuntimeError:
                # In test mode we don't care that we can't find the API files
                if testmode:
                    apifiles = []
                else:
                    raise VPPRuntimeError

        for file in apifiles:
            with open(file) as apidef_file:
                self.process_json_file(apidef_file)

        self.apifiles = apifiles

        # Basic sanity check
        if len(self.messages) == 0 and not testmode:
            raise VPPValueError(1, 'Missing JSON message definitions')

        self.transport = VppTransport(self, read_timeout=read_timeout,
                                      server_address=server_address)
        # Make sure we allow VPP to clean up the message rings.
        atexit.register(vpp_atexit, weakref.ref(self))

    class ContextId(object):
        """Thread-safe provider of unique context IDs."""
        def __init__(self):
            self.context = 0
            self.lock = threading.Lock()

        def __call__(self):
            """Get a new unique (or, at least, not recently used) context."""
            with self.lock:
                self.context += 1
                return self.context
    get_context = ContextId()

    def get_type(self, name):
        return vpp_get_type(name)

    @classmethod
    def find_api_dir(cls):
        """Attempt to find the best directory in which API definition
        files may reside. If the value VPP_API_DIR exists in the environment
        then it is first on the search list. If we're inside a recognized
        location in a VPP source tree (src/scripts and src/vpp-api/python)
        then entries from there to the likely locations in build-root are
        added. Finally the location used by system packages is added.

        :returns: A single directory name, or None if no such directory
            could be found.
        """
        dirs = [cls.apidir] if cls.apidir else []

        # perhaps we're in the 'src/scripts' or 'src/vpp-api/python' dir;
        # in which case, plot a course to likely places in the src tree
        import __main__ as main
        if hasattr(main, '__file__'):
            # get the path of the calling script
            localdir = os.path.dirname(os.path.realpath(main.__file__))
        else:
            # use cwd if there is no calling script
            localdir = os.getcwd()
        localdir_s = localdir.split(os.path.sep)

        def dmatch(dir):
            """Match dir against right-hand components of the script dir"""
            d = dir.split('/')  # param 'dir' assumes a / separator
            length = len(d)
            return len(localdir_s) > length and localdir_s[-length:] == d

        def sdir(srcdir, variant):
            """Build a path from srcdir to the staged API files of
            'variant'  (typically '' or '_debug')"""
            # Since 'core' and 'plugin' files are staged
            # in separate directories, we target the parent dir.
            return os.path.sep.join((
                srcdir,
                'build-root',
                'install-vpp%s-native' % variant,
                'vpp',
                'share',
                'vpp',
                'api',
            ))

        srcdir = None
        if dmatch('src/scripts'):
            srcdir = os.path.sep.join(localdir_s[:-2])
        elif dmatch('src/vpp-api/python'):
            srcdir = os.path.sep.join(localdir_s[:-3])
        elif dmatch('test'):
            # we're apparently running tests
            srcdir = os.path.sep.join(localdir_s[:-1])

        if srcdir:
            # we're in the source tree, try both the debug and release
            # variants.
            dirs.append(sdir(srcdir, '_debug'))
            dirs.append(sdir(srcdir, ''))

        # Test for staged copies of the scripts
        # For these, since we explicitly know if we're running a debug versus
        # release variant, target only the relevant directory
        if dmatch('build-root/install-vpp_debug-native/vpp/bin'):
            srcdir = os.path.sep.join(localdir_s[:-4])
            dirs.append(sdir(srcdir, '_debug'))
        if dmatch('build-root/install-vpp-native/vpp/bin'):
            srcdir = os.path.sep.join(localdir_s[:-4])
            dirs.append(sdir(srcdir, ''))

        # finally, try the location system packages typically install into
        dirs.append(os.path.sep.join(('', 'usr', 'share', 'vpp', 'api')))

        # check the directories for existence; first one wins
        for dir in dirs:
            if os.path.isdir(dir):
                return dir

        return None

    @classmethod
    def find_api_files(cls, api_dir=None, patterns='*'):
        """Find API definition files from the given directory tree with the
        given pattern. If no directory is given then find_api_dir() is used
        to locate one. If no pattern is given then all definition files found
        in the directory tree are used.

        :param api_dir: A directory tree in which to locate API definition
            files; subdirectories are descended into.
            If this is None then find_api_dir() is called to discover it.
        :param patterns: A list of patterns to use in each visited directory
            when looking for files.
            This can be a list/tuple object or a comma-separated string of
            patterns. Each value in the list will have leading/trialing
            whitespace stripped.
            The pattern specifies the first part of the filename, '.api.json'
            is appended.
            The results are de-duplicated, thus overlapping patterns are fine.
            If this is None it defaults to '*' meaning "all API files".
        :returns: A list of file paths for the API files found.
        """
        if api_dir is None:
            api_dir = cls.find_api_dir()
            if api_dir is None:
                raise VPPApiError("api_dir cannot be located")

        if isinstance(patterns, list) or isinstance(patterns, tuple):
            patterns = [p.strip() + '.api.json' for p in patterns]
        else:
            patterns = [p.strip() + '.api.json' for p in patterns.split(",")]

        api_files = []
        for root, dirnames, files in os.walk(api_dir):
            # iterate all given patterns and de-dup the result
            files = set(sum([fnmatch.filter(files, p) for p in patterns], []))
            for filename in files:
                api_files.append(os.path.join(root, filename))

        return api_files

    @property
    def api(self):
        if not hasattr(self, "_api"):
            raise VPPApiError("Not connected, api definitions not available")
        return self._api

    def make_function(self, msg, i, multipart, do_async):
        if (do_async):
            def f(**kwargs):
                return self._call_vpp_async(i, msg, **kwargs)
        else:
            def f(**kwargs):
                return self._call_vpp(i, msg, multipart, **kwargs)

        f.__name__ = str(msg.name)
        f.__doc__ = ", ".join(["%s %s" %
                               (msg.fieldtypes[j], k)
                               for j, k in enumerate(msg.fields)])
        f.msg = msg

        return f

    def _register_functions(self, do_async=False):
        self.id_names = [None] * (self.vpp_dictionary_maxid + 1)
        self.id_msgdef = [None] * (self.vpp_dictionary_maxid + 1)
        self._api = VppApiDynamicMethodHolder()
        for name, msg in vpp_iterator(self.messages):
            n = name + '_' + msg.crc[2:]
            i = self.transport.get_msg_index(n.encode('utf-8'))
            if i > 0:
                self.id_msgdef[i] = msg
                self.id_names[i] = name

                # Create function for client side messages.
                if name in self.services:
                    if 'stream' in self.services[name] and \
                       self.services[name]['stream']:
                        multipart = True
                    else:
                        multipart = False
                    f = self.make_function(msg, i, multipart, do_async)
                    setattr(self._api, name, FuncWrapper(f))
            else:
                self.logger.debug(
                    'No such message type or failed CRC checksum: %s', n)

    def connect_internal(self, name, msg_handler, chroot_prefix, rx_qlen,
                         do_async):
        pfx = chroot_prefix.encode('utf-8') if chroot_prefix else None

        rv = self.transport.connect(name.encode('utf-8'), pfx,
                                    msg_handler, rx_qlen)
        if rv != 0:
            raise VPPIOError(2, 'Connect failed')
        self.vpp_dictionary_maxid = self.transport.msg_table_max_index()
        self._register_functions(do_async=do_async)

        # Initialise control ping
        crc = self.messages['control_ping'].crc
        self.control_ping_index = self.transport.get_msg_index(
            ('control_ping' + '_' + crc[2:]).encode('utf-8'))
        self.control_ping_msgdef = self.messages['control_ping']
        if self.async_thread:
            self.event_thread = threading.Thread(
                target=self.thread_msg_handler)
            self.event_thread.daemon = True
            self.event_thread.start()
        else:
            self.event_thread = None
        return rv

    def connect(self, name, chroot_prefix=None, do_async=False, rx_qlen=32):
        """Attach to VPP.

        name - the name of the client.
        chroot_prefix - if VPP is chroot'ed, the prefix of the jail
        do_async - if true, messages are sent without waiting for a reply
        rx_qlen - the length of the VPP message receive queue between
        client and server.
        """
        msg_handler = self.transport.get_callback(do_async)
        return self.connect_internal(name, msg_handler, chroot_prefix, rx_qlen,
                                     do_async)

    def connect_sync(self, name, chroot_prefix=None, rx_qlen=32):
        """Attach to VPP in synchronous mode. Application must poll for events.

        name - the name of the client.
        chroot_prefix - if VPP is chroot'ed, the prefix of the jail
        rx_qlen - the length of the VPP message receive queue between
        client and server.
        """

        return self.connect_internal(name, None, chroot_prefix, rx_qlen,
                                     do_async=False)

    def disconnect(self):
        """Detach from VPP."""
        rv = self.transport.disconnect()
        if self.event_thread is not None:
            self.message_queue.put("terminate event thread")
        return rv

    def msg_handler_sync(self, msg):
        """Process an incoming message from VPP in sync mode.

        The message may be a reply or it may be an async notification.
        """
        r = self.decode_incoming_msg(msg)
        if r is None:
            return

        # If we have a context, then use the context to find any
        # request waiting for a reply
        context = 0
        if hasattr(r, 'context') and r.context > 0:
            context = r.context

        if context == 0:
            # No context -> async notification that we feed to the callback
            self.message_queue.put_nowait(r)
        else:
            raise VPPIOError(2, 'RPC reply message received in event handler')

    def has_context(self, msg):
        if len(msg) < 10:
            return False

        header = VPPType('header_with_context', [['u16', 'msgid'],
                                                 ['u32', 'client_index'],
                                                 ['u32', 'context']])

        (i, ci, context), size = header.unpack(msg, 0)
        if self.id_names[i] == 'rx_thread_exit':
            return

        #
        # Decode message and returns a tuple.
        #
        msgobj = self.id_msgdef[i]
        if 'context' in msgobj.field_by_name and context >= 0:
            return True
        return False

    def decode_incoming_msg(self, msg, no_type_conversion=False):
        if not msg:
            self.logger.warning('vpp_api.read failed')
            return

        (i, ci), size = self.header.unpack(msg, 0)
        if self.id_names[i] == 'rx_thread_exit':
            return

        #
        # Decode message and returns a tuple.
        #
        msgobj = self.id_msgdef[i]
        if not msgobj:
            raise VPPIOError(2, 'Reply message undefined')

        r, size = msgobj.unpack(msg, ntc=no_type_conversion)
        return r

    def msg_handler_async(self, msg):
        """Process a message from VPP in async mode.

        In async mode, all messages are returned to the callback.
        """
        r = self.decode_incoming_msg(msg)
        if r is None:
            return

        msgname = type(r).__name__

        if self.event_callback:
            self.event_callback(msgname, r)

    def _control_ping(self, context):
        """Send a ping command."""
        self._call_vpp_async(self.control_ping_index,
                             self.control_ping_msgdef,
                             context=context)

    def validate_args(self, msg, kwargs):
        d = set(kwargs.keys()) - set(msg.field_by_name.keys())
        if d:
            raise VPPValueError('Invalid argument {} to {}'
                                .format(list(d), msg.name))

    def _call_vpp(self, i, msgdef, multipart, **kwargs):
        """Given a message, send the message and await a reply.

        msgdef - the message packing definition
        i - the message type index
        multipart - True if the message returns multiple
        messages in return.
        context - context number - chosen at random if not
        supplied.
        The remainder of the kwargs are the arguments to the API call.

        The return value is the message or message array containing
        the response.  It will raise an IOError exception if there was
        no response within the timeout window.
        """

        if 'context' not in kwargs:
            context = self.get_context()
            kwargs['context'] = context
        else:
            context = kwargs['context']
        kwargs['_vl_msg_id'] = i

        no_type_conversion = kwargs.pop('_no_type_conversion', False)

        try:
            if self.transport.socket_index:
                kwargs['client_index'] = self.transport.socket_index
        except AttributeError:
            pass
        self.validate_args(msgdef, kwargs)

        logging.debug(call_logger(msgdef, kwargs))

        b = msgdef.pack(kwargs)
        self.transport.suspend()

        self.transport.write(b)

        if multipart:
            # Send a ping after the request - we use its response
            # to detect that we have seen all results.
            self._control_ping(context)

        # Block until we get a reply.
        rl = []
        while (True):
            msg = self.transport.read()
            if not msg:
                raise VPPIOError(2, 'VPP API client: read failed')
            r = self.decode_incoming_msg(msg, no_type_conversion)
            msgname = type(r).__name__
            if context not in r or r.context == 0 or context != r.context:
                # Message being queued
                self.message_queue.put_nowait(r)
                continue

            if not multipart:
                rl = r
                break
            if msgname == 'control_ping_reply':
                break

            rl.append(r)

        self.transport.resume()

        logger.debug(return_logger(rl))
        return rl

    def _call_vpp_async(self, i, msg, **kwargs):
        """Given a message, send the message and await a reply.

        msgdef - the message packing definition
        i - the message type index
        context - context number - chosen at random if not
        supplied.
        The remainder of the kwargs are the arguments to the API call.
        """
        if 'context' not in kwargs:
            context = self.get_context()
            kwargs['context'] = context
        else:
            context = kwargs['context']
        try:
            if self.transport.socket_index:
                kwargs['client_index'] = self.transport.socket_index
        except AttributeError:
            kwargs['client_index'] = 0
        kwargs['_vl_msg_id'] = i
        b = msg.pack(kwargs)

        self.transport.write(b)

    def register_event_callback(self, callback):
        """Register a callback for async messages.

        This will be called for async notifications in sync mode,
        and all messages in async mode.  In sync mode, replies to
        requests will not come here.

        callback is a fn(msg_type_name, msg_type) that will be
        called when a message comes in.  While this function is
        executing, note that (a) you are in a background thread and
        may wish to use threading.Lock to protect your datastructures,
        and (b) message processing from VPP will stop (so if you take
        a long while about it you may provoke reply timeouts or cause
        VPP to fill the RX buffer).  Passing None will disable the
        callback.
        """
        self.event_callback = callback

    def thread_msg_handler(self):
        """Python thread calling the user registered message handler.

        This is to emulate the old style event callback scheme. Modern
        clients should provide their own thread to poll the event
        queue.
        """
        while True:
            r = self.message_queue.get()
            if r == "terminate event thread":
                break
            msgname = type(r).__name__
            if self.event_callback:
                self.event_callback(msgname, r)

# Provide the old name for backward compatibility.
VPP = VPPApiClient

# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4


context:
space:
mode: