Test OpenStack SRIOV (by quqi99)

作者：张华发表于：2016-12-06
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( http://blog.csdn.net/quqi99 )

硬件准备

我的实验硬件设备如下，需CPU与主板同时支持VT-x与VT-d，网卡支持SR-IOV:

英特尔（Intel）酷睿i5-4590 22纳米 Haswell架构盒装CPU处理器（LGA1150/3.3GHz/6M三级缓存）
华硕（ASUS） B85-PRO GAMER 主板（Intel B85/LGA 1150）
Winyao WY576T PCI-E X4 双口服务器千兆网卡 intel 82576

并更新华硕主板的BIOS程序至最后的B85-PRO-GAMER-ASUS-2203.zip配合使用i5:
http://www.asus.com/au/supportonly/B85-PRO%20GAMER/HelpDesk_Download/
http://www.asus.com/au/supportonly/B85-PRO%20GAMER/HelpDesk_CPU/

驱动准备

在启动igb模块后（sudo modprobe -r igb && sudo modprobe igb max_vfs=2）就能用lspci命令看到这块物理网卡已经被注册成了多个SR-IOV网卡。使用下列方法持久化：

1， vi /etc/modprobe.d/igb.confoptions igb max_vfs=2
2, update kernel, update-initramfs -k all -t -u
3, igbvf驱动应该是hypervisor里用的，所以host应该禁用它vi /etc/modprobe.d/blacklist-igbvf.confblacklist  igbvf

SRIOV NIC info

$ lspci -nn |grep 82576
06:00.0 Ethernet controller [0200]: Intel Corporation 82576 Gigabit Network Connection [8086:10c9] (rev 01)
06:00.1 Ethernet controller [0200]: Intel Corporation 82576 Gigabit Network Connection [8086:10c9] (rev 01)
07:10.0 Ethernet controller [0200]: Intel Corporation 82576 Virtual Function [8086:10ca] (rev 01)
07:10.1 Ethernet controller [0200]: Intel Corporation 82576 Virtual Function [8086:10ca] (rev 01)
07:10.2 Ethernet controller [0200]: Intel Corporation 82576 Virtual Function [8086:10ca] (rev 01)
07:10.3 Ethernet controller [0200]: Intel Corporation 82576 Virtual Function [8086:10ca] (rev 01)$ sudo virsh nodedev-list --tree...+- pci_0000_00_1c_4|   ||   +- pci_0000_06_00_0|   |   ||   |   +- net_enp6s0f0_2c_53_4a_02_20_3c|   +- pci_0000_06_00_1|   |   ||   |   +- net_enp6s0f1_2c_53_4a_02_20_3d|   +- pci_0000_07_10_0|   +- pci_0000_07_10_1|   +- pci_0000_07_10_2|   +- pci_0000_07_10_3$ ip link show enp6s0f0
3: enp6s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000link/ether 2c:53:4a:02:20:3c brd ff:ff:ff:ff:ff:ffvf 0 MAC 00:00:00:00:00:00, spoof checking on, link-state autovf 1 MAC 00:00:00:00:00:00, spoof checking on, link-state auto$ ip link show enp6s0f1
4: enp6s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000link/ether 2c:53:4a:02:20:3d brd ff:ff:ff:ff:ff:ffvf 0 MAC 00:00:00:00:00:00, spoof checking on, link-state autovf 1 MAC 00:00:00:00:00:00, spoof checking on, link-state auto

Step 1

Enable IOMMU support

#/etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="intel_iommu=pt intel_iommu=on pci=assign-busses"$ update-grub

Set up a common OpenStack env

# Network infoneutron net-create private --provider:network_type flat --provider:physical_network physnet1
neutron subnet-create --allocation-pool start=10.0.1.22,end=10.0.1.122 --gateway 10.0.1.1 private 10.0.1.0/24 --enable_dhcp=True --name privateneutron net-create public -- --router:external=True --provider:network_type flat --provider:physical_network public
neutron subnet-create --allocation-pool start=10.230.56.100,end=10.230.56.104 --gateway 10.230.56.1 public 10.230.56.100/21 --enable_dhcp=False --name public-subnetneutron router-create router1
EXT_NET_ID=$(neutron net-list |grep ' public ' |awk '{print $2}')
ROUTER_ID=$(neutron router-list |grep ' router1 ' |awk '{print $2}')
SUBNET_ID=$(neutron subnet-list |grep '10.0.1.0/24' |awk '{print $2}')
neutron router-interface-add $ROUTER_ID $SUBNET_ID
neutron router-gateway-set $ROUTER_ID $EXT_NET_ID

Step 2, Enable SRIOV support

/etc/neutron/plugins/ml2/ml2_conf.ini

[ml2_type_flat]
flat_networks = physnet1,physnet2,sriov1,sriov2[ml2_sriov]
supported_pci_vendor_devs = 8086:10ca[securitygroup]
firewall_driver = neutron.agent.firewall.NoopFirewallDriver[sriov_nic]
physical_device_mappings = sriov1:enp6s0f0,sriov2:enp6s0f1
exclude_devices =

Start neutron-sriov-nic-agent process

neutron-sriov-nic-agent --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini

Modify /etc/nova/nova.conf, and restart nova-schedule process
注: passthrough_whitelist用于nova-compute, scheduler_available_filters用于nova-schedule, pci_alias用于nova-api, 见: https://wiki.openstack.org/wiki/PCI_passthrough_SRIOV_support

[pci]
passthrough_whitelist = {"devname": "enp6s0f0", "physical_network": "sriov1"}
passthrough_whitelist = {"devname": "enp6s0f1", "physical_network": "sriov2"}[DEFAULT]
pci_alias={"vendor_id":"8086", "product_id":"10ca", "name":"a1"}scheduler_available_filters = nova.scheduler.filters.all_filters
scheduler_default_filters = RetryFilter, AvailabilityZoneFilter, RamFilter, ComputeFilter, ComputeCapabilitiesFilter, ImagePropertiesFilter, PciPassthroughFilter

Step 3, Create sriov network

neutron net-create sriov_net --provider:network_type flat --provider:physical_network sriov1
neutron subnet-create --allocation-pool start=192.168.9.122,end=192.168.9.129 sriov_net 192.168.9.0/24 --enable_dhcp=False --name=sriov_subnet

Step 4, Boot test VM

nova keypair-add --pub-key ~/.ssh/id_rsa.pub mykey
nova secgroup-add-rule default tcp 22 22 0.0.0.0/0
nova secgroup-add-rule default icmp -1 -1 0.0.0.0/0nova flavor-key m1.medium set "pci_passthrough:alias"="a1:1"neutron port-create sriov_net --name sriov_port --binding:vnic-type direct
nova boot --key-name mykey --image trusty-server-cloudimg-amd64-disk1 --flavor m1.medium --nic port-id=$(neutron port-list |grep ' sriov_port ' |awk '{print $2}') i1FLOATING_IP=$(nova floating-ip-create |grep 'public' |awk '{print $4}')
nova add-floating-ip i1 $FLOATING_IP
sudo ip addr add 192.168.101.1/24 dev br-ex
ssh ubuntu@192.168.101.101 -vIt equals:
neutron port-create sriov_net --name sriov_port --binding:host_id desktop --binding:vnic-type direct --binding:profile type=dict pci_vendor_info=8086:10ca,pci_slot=0000:07:10.0,physical_network=sriov1
nova interface-attach --port-id $(neutron port-show sriov_port |grep ' id ' |awk -F '|' '{print $3}') i1

Step 5, Problem Fix

1, VFIO_MAP_DMA cannot allocate memory

ln -s /etc/apparmor.d/usr.sbin.libvirtd  /etc/apparmor.d/disable/
ln -s /etc/apparmor.d/usr.lib.libvirt.virt-aa-helper  /etc/apparmor.d/disable/
apparmor_parser -R  /etc/apparmor.d/usr.sbin.libvirtd
apparmor_parser -R  /etc/apparmor.d/usr.lib.libvirt.virt-aa-helper

Step 6, Code analysis

1, 'nova boot' one VM will invoke _validate_and_build_base_options.
pci_request.get_pci_requests_from_flavor is used to create InstancePCIRequests(instance_uuid, InstancePCIRequest(count, spec, alias_name, is_new, request_id)) by the flavor with pci_alias.
self.network_api.create_pci_requests_for_sriov_ports is used to fill in request_net.pci_request_iddef _validate_and_build_base_options(...)
...
# PCI requests come from two sources: instance flavor and
# requested_networks. The first call in below returns an
# InstancePCIRequests object which is a list of InstancePCIRequest
# objects. The second call in below creates an InstancePCIRequest
# object for each SR-IOV port, and append it to the list in the
# InstancePCIRequests object
pci_request_info = pci_request.get_pci_requests_from_flavor(
instance_type)
self.network_api.create_pci_requests_for_sriov_ports(context,
pci_request_info, requested_networks)def get_pci_requests_from_flavor(flavor):
pci_requests = []
if ('extra_specs' in flavor and
'pci_passthrough:alias' in flavor['extra_specs']):
pci_requests = _translate_alias_to_requests(
flavor['extra_specs']['pci_passthrough:alias'])
return objects.InstancePCIRequests(requests=pci_requests)fields = {
'instance_uuid': fields.UUIDField(),
'requests': fields.ListOfObjectsField('InstancePCIRequest'),
}2, build_and_run_instance will invoke instance_claim then invoke _test_pci to clain pci for the instance by retrieving InstancePCIRequests via instance_uuid.def _test_pci(self):
pci_requests = objects.InstancePCIRequests.get_by_instance_uuid(
self.context, self.instance.uuid)
if pci_requests.requests:
devs = self.tracker.pci_tracker.claim_instance(self.context,
self.instance)
if not devs:
return _('Claim pci failed.')def _claim_instance(self, context, instance, prefix=''):
pci_requests = objects.InstancePCIRequests.get_by_instance(context, instance)
...
devs = self.stats.consume_requests(pci_requests.requests,instance_cells)
...
return devs3, Final pci_request_id conducts _populate_neutron_binding_profile to use pci_manager.get_instance_pci_devs find pci_dev for the instance, then set binding:profile for Neutron.def _populate_neutron_binding_profile(instance, pci_request_id, port_req_body):
if pci_request_id:
pci_dev = pci_manager.get_instance_pci_devs(
instance, pci_request_id).pop()
devspec = pci_whitelist.get_pci_device_devspec(pci_dev)
profile = {'pci_vendor_info': "%s:%s" % (pci_dev.vendor_id,
pci_dev.product_id),
'pci_slot': pci_dev.address,
'physical_network':
devspec.get_tags().get('physical_network')
}
port_req_body['port']['binding:profile'] = profileNOTE: for os-attach-interfaces extension api, allocate_port_for_instance invoked by attach_interface function will simply pass pci_request_id=None before running self.allocate_for_instance/_populate_neutron_binding_profile, so seems 'nova interface-attach' operation need to re-deploy the existing VM to have sr-iov ports after defining pci_alias for the flavor.