vnfs/qemu/qemu_dpdk_vhost_user.py

   1 # Copyright 2015 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 """Automation of QEMU hypervisor for launching vhost-user enabled guests.
  16 """
  17
  18 import logging
  19
  20 from conf import settings as S
  21 from vnfs.qemu.qemu import IVnfQemu
  22
  23 class QemuDpdkVhostUser(IVnfQemu):
  24     """
  25     Control an instance of QEMU with vHost user guest communication.
  26     """
  27     def __init__(self):
  28         """
  29         Initialisation function.
  30         """
  31         super(QemuDpdkVhostUser, self).__init__()
  32         self._logger = logging.getLogger(__name__)
  33
  34         # multi-queue values
  35         if int(S.getValue('GUEST_NIC_QUEUES')[self._number]):
  36             queue_str = ',queues={}'.format(S.getValue('GUEST_NIC_QUEUES')[self._number])
  37             mq_vector_str = ',mq=on,vectors={}'.format(
  38                 int(S.getValue('GUEST_NIC_QUEUES')[self._number]) * 2 + 2)
  39         else:
  40             queue_str, mq_vector_str = '', ''
  41
  42         # Guest merge buffer setting
  43         if S.getValue('GUEST_NIC_MERGE_BUFFERS_DISABLE')[self._number]:
  44             merge_buff = 'mrg_rxbuf=off,'
  45         else:
  46             merge_buff = ''
  47
  48         # calculate index of first interface, i.e. check how many
  49         # interfaces has been created for previous VMs, where 1st NIC
  50         # of 1st VM has index 0
  51         start_index = sum(S.getValue('GUEST_NICS_NR')[:self._number])
  52
  53         # setup requested number of interfaces
  54         for nic in range(len(self._nics)):
  55             index = start_index + nic
  56             ifi = str(index)
  57             net = 'net' + str(index + 1)
  58
  59             self._cmd += ['-chardev',
  60                           'socket,id=char' + ifi +
  61                           ',path=' + S.getValue('TOOLS')['ovs_var_tmp'] +
  62                           'dpdkvhostuser' + ifi,
  63                           '-netdev',
  64                           'type=vhost-user,id=' + net +
  65                           ',chardev=char' + ifi + ',vhostforce' + queue_str,
  66                           '-device',
  67                           'virtio-net-pci,mac=' +
  68                           self._nics[nic]['mac'] +
  69                           ',netdev=' + net + ',csum=off,' + merge_buff +
  70                           'gso=off,' +
  71                           'guest_tso4=off,guest_tso6=off,guest_ecn=off' +
  72                           mq_vector_str,
  73                          ]