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 import os
  21
  22 from src.ovs import OFBridge
  23 from src.dpdk import dpdk
  24 from conf import settings
  25 from vswitches.ovs import IVSwitchOvs
  26
  27 class OvsDpdkVhost(IVSwitchOvs):
  28     """ Open vSwitch with DPDK support
  29
  30     Generic OVS wrapper functionality in src.ovs is maximally used. This
  31     class wraps DPDK system configuration along with DPDK specific OVS
  32     parameters
  33
  34     The method docstrings document only considerations specific to this
  35     implementation. For generic information of the nature of the methods,
  36     see the interface.
  37     """
  38
  39     def __init__(self):
  40         super(OvsDpdkVhost, self).__init__()
  41         self._logger = logging.getLogger(__name__)
  42
  43         vswitchd_args = []
  44
  45         # legacy DPDK configuration through --dpdk option of vswitchd
  46         if self.old_dpdk_config():
  47             vswitchd_args = ['--dpdk'] + settings.getValue('VSWITCHD_DPDK_ARGS')
  48             if self._vswitchd_args:
  49                 self._vswitchd_args = vswitchd_args + ['--'] + self._vswitchd_args
  50             else:
  51                 self._vswitchd_args = vswitchd_args
  52
  53     def configure(self):
  54         """ Configure vswitchd DPDK options through ovsdb if needed
  55         """
  56         dpdk_config = settings.getValue('VSWITCHD_DPDK_CONFIG')
  57         if dpdk_config and not self.old_dpdk_config():
  58             # enforce calls to ovs-vsctl with --no-wait
  59             tmp_br = OFBridge(timeout=-1)
  60             for option in dpdk_config:
  61                 tmp_br.set_db_attribute('Open_vSwitch', '.',
  62                                         'other_config:' + option, dpdk_config[option])
  63
  64     def start(self):
  65         """See IVswitch for general description
  66
  67         Activates DPDK kernel modules, ovsdb and vswitchd.
  68         """
  69         dpdk.init()
  70         super(OvsDpdkVhost, self).start()
  71         # old style OVS <= 2.5.0 multi-queue enable
  72         if settings.getValue('OVS_OLD_STYLE_MQ') and \
  73                 int(settings.getValue('VSWITCH_DPDK_MULTI_QUEUES')):
  74             tmp_br = OFBridge(timeout=-1)
  75             tmp_br.set_db_attribute(
  76                 'Open_vSwitch', '.', 'other_config:' +
  77                 'n-dpdk-rxqs', settings.getValue('VSWITCH_DPDK_MULTI_QUEUES'))
  78
  79     def stop(self):
  80         """See IVswitch for general description
  81
  82         Kills ovsdb and vswitchd and removes DPDK kernel modules.
  83         """
  84
  85         super(OvsDpdkVhost, self).stop()
  86         dpdk.cleanup()
  87
  88     def add_switch(self, switch_name, params=None):
  89         """See IVswitch for general description
  90         """
  91         switch_params = ['--', 'set', 'bridge', switch_name, 'datapath_type=netdev']
  92         if params:
  93             switch_params = switch_params + params
  94
  95         super(OvsDpdkVhost, self).add_switch(switch_name, switch_params)
  96         if settings.getValue('VSWITCH_AFFINITIZATION_ON') == 1:
  97             # Sets the PMD core mask to VSWITCH_PMD_CPU_MASK
  98             # for CPU core affinitization
  99             self._bridges[switch_name].set_db_attribute('Open_vSwitch', '.',
 100                                                         'other_config:pmd-cpu-mask',
 101                                                         settings.getValue('VSWITCH_PMD_CPU_MASK'))
 102
 103     def add_phy_port(self, switch_name):
 104         """See IVswitch for general description
 105
 106         Creates a port of type dpdk.
 107         The new port is named dpdk<n> where n is an integer starting from 0.
 108         """
 109         bridge = self._bridges[switch_name]
 110         dpdk_count = self._get_port_count('type=dpdk')
 111         port_name = 'dpdk' + str(dpdk_count)
 112         params = ['--', 'set', 'Interface', port_name, 'type=dpdk']
 113         # multi-queue enable
 114
 115         if int(settings.getValue('VSWITCH_DPDK_MULTI_QUEUES')) and \
 116                 not settings.getValue('OVS_OLD_STYLE_MQ'):
 117                 params += ['options:n_rxq={}'.format(
 118                     settings.getValue('VSWITCH_DPDK_MULTI_QUEUES'))]
 119         of_port = bridge.add_port(port_name, params)
 120         return (port_name, of_port)
 121
 122     def add_vport(self, switch_name):
 123         """See IVswitch for general description
 124
 125         Creates a port of type dpdkvhost
 126         The new port is named dpdkvhost<n> where n is an integer starting
 127         from 0
 128         """
 129         bridge = self._bridges[switch_name]
 130         vhost_count = self._get_port_count('type=dpdkvhostuser')
 131         port_name = 'dpdkvhostuser' + str(vhost_count)
 132         params = ['--', 'set', 'Interface', port_name, 'type=dpdkvhostuser']
 133         # multi queue enable
 134         if int(settings.getValue('VSWITCH_DPDK_MULTI_QUEUES')) and \
 135                 not settings.getValue('OVS_OLD_STYLE_MQ'):
 136             params += ['options:n_rxq={}'.format(
 137                 settings.getValue('VSWITCH_DPDK_MULTI_QUEUES'))]
 138         of_port = bridge.add_port(port_name, params)
 139
 140         return (port_name, of_port)
 141
 142     @staticmethod
 143     def old_dpdk_config():
 144         """Checks if ovs-vswitchd uses legacy dpdk configuration via --dpdk option
 145
 146         :returns: True if legacy --dpdk option is supported, otherwise it returns False
 147         """
 148
 149         ovs_vswitchd_bin = settings.getValue('TOOLS')['ovs-vswitchd']
 150         try:
 151             subprocess.check_output(ovs_vswitchd_bin + r' --help | grep "\-\-dpdk"', shell=True)
 152             return True
 153         except subprocess.CalledProcessError:
 154             return False