vswitches/ovs_dpdk_vhost.py

   1 # Copyright 2015-2016 Intel Corporation.
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #   http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 """VSPERF VSwitch implementation using DPDK and vhost ports
  16 """
  17
  18 import logging
  19 import subprocess
  20
  21 from src.ovs import OFBridge
  22 from src.dpdk import dpdk
  23 from conf import settings
  24 from vswitches.ovs import IVSwitchOvs
  25
  26 class OvsDpdkVhost(IVSwitchOvs):
  27     """ Open vSwitch with DPDK support
  28
  29     Generic OVS wrapper functionality in src.ovs is maximally used. This
  30     class wraps DPDK system configuration along with DPDK specific OVS
  31     parameters
  32
  33     The method docstrings document only considerations specific to this
  34     implementation. For generic information of the nature of the methods,
  35     see the interface.
  36     """
  37
  38     def __init__(self):
  39         super(OvsDpdkVhost, self).__init__()
  40         self._logger = logging.getLogger(__name__)
  41
  42         vswitchd_args = []
  43
  44         # legacy DPDK configuration through --dpdk option of vswitchd
  45         if self.old_dpdk_config():
  46             vswitchd_args = ['--dpdk'] + settings.getValue('VSWITCHD_DPDK_ARGS')
  47             if self._vswitchd_args:
  48                 self._vswitchd_args = vswitchd_args + ['--'] + self._vswitchd_args
  49             else:
  50                 self._vswitchd_args = vswitchd_args
  51
  52     def configure(self):
  53         """ Configure vswitchd DPDK options through ovsdb if needed
  54         """
  55         dpdk_config = settings.getValue('VSWITCHD_DPDK_CONFIG')
  56         if dpdk_config and not self.old_dpdk_config():
  57             # enforce calls to ovs-vsctl with --no-wait
  58             tmp_br = OFBridge(timeout=-1)
  59             for option in dpdk_config:
  60                 tmp_br.set_db_attribute('Open_vSwitch', '.',
  61                                         'other_config:' + option, dpdk_config[option])
  62
  63     def start(self):
  64         """See IVswitch for general description
  65
  66         Activates DPDK kernel modules, ovsdb and vswitchd.
  67         """
  68         dpdk.init()
  69         super(OvsDpdkVhost, self).start()
  70         # old style OVS <= 2.5.0 multi-queue enable
  71         if settings.getValue('OVS_OLD_STYLE_MQ') and \
  72                 int(settings.getValue('VSWITCH_DPDK_MULTI_QUEUES')):
  73             tmp_br = OFBridge(timeout=-1)
  74             tmp_br.set_db_attribute(
  75                 'Open_vSwitch', '.', 'other_config:' +
  76                 'n-dpdk-rxqs', settings.getValue('VSWITCH_DPDK_MULTI_QUEUES'))
  77
  78     def stop(self):
  79         """See IVswitch for general description
  80
  81         Kills ovsdb and vswitchd and removes DPDK kernel modules.
  82         """
  83
  84         super(OvsDpdkVhost, self).stop()
  85         dpdk.cleanup()
  86
  87     def add_switch(self, switch_name, params=None):
  88         """See IVswitch for general description
  89         """
  90         switch_params = ['--', 'set', 'bridge', switch_name, 'datapath_type=netdev']
  91         if params:
  92             switch_params = switch_params + params
  93
  94         super(OvsDpdkVhost, self).add_switch(switch_name, switch_params)
  95         if settings.getValue('VSWITCH_AFFINITIZATION_ON') == 1:
  96             # Sets the PMD core mask to VSWITCH_PMD_CPU_MASK
  97             # for CPU core affinitization
  98             self._bridges[switch_name].set_db_attribute('Open_vSwitch', '.',
  99                                                         'other_config:pmd-cpu-mask',
 100                                                         settings.getValue('VSWITCH_PMD_CPU_MASK'))
 101
 102     def add_phy_port(self, switch_name):
 103         """See IVswitch for general description
 104
 105         Creates a port of type dpdk.
 106         The new port is named dpdk<n> where n is an integer starting from 0.
 107         """
 108         bridge = self._bridges[switch_name]
 109         dpdk_count = self._get_port_count('type=dpdk')
 110         port_name = 'dpdk' + str(dpdk_count)
 111         params = ['--', 'set', 'Interface', port_name, 'type=dpdk']
 112         # multi-queue enable
 113
 114         if int(settings.getValue('VSWITCH_DPDK_MULTI_QUEUES')) and \
 115                 not settings.getValue('OVS_OLD_STYLE_MQ'):
 116             params += ['options:n_rxq={}'.format(
 117                 settings.getValue('VSWITCH_DPDK_MULTI_QUEUES'))]
 118         of_port = bridge.add_port(port_name, params)
 119         return (port_name, of_port)
 120
 121     def add_vport(self, switch_name):
 122         """See IVswitch for general description
 123
 124         Creates a port of type dpdkvhost
 125         The new port is named dpdkvhost<n> where n is an integer starting
 126         from 0
 127         """
 128         bridge = self._bridges[switch_name]
 129         vhost_count = self._get_port_count('type=dpdkvhostuser')
 130         port_name = 'dpdkvhostuser' + str(vhost_count)
 131         params = ['--', 'set', 'Interface', port_name, 'type=dpdkvhostuser']
 132         # multi queue enable
 133         if int(settings.getValue('VSWITCH_DPDK_MULTI_QUEUES')) and \
 134                 not settings.getValue('OVS_OLD_STYLE_MQ'):
 135             params += ['options:n_rxq={}'.format(
 136                 settings.getValue('VSWITCH_DPDK_MULTI_QUEUES'))]
 137         of_port = bridge.add_port(port_name, params)
 138
 139         return (port_name, of_port)
 140
 141     @staticmethod
 142     def old_dpdk_config():
 143         """Checks if ovs-vswitchd uses legacy dpdk configuration via --dpdk option
 144
 145         :returns: True if legacy --dpdk option is supported, otherwise it returns False
 146         """
 147
 148         ovs_vswitchd_bin = settings.getValue('TOOLS')['ovs-vswitchd']
 149         try:
 150             subprocess.check_output(ovs_vswitchd_bin + r' --help | grep "\-\-dpdk"', shell=True)
 151             return True
 152         except subprocess.CalledProcessError:
 153             return False