SR-IOV功能介紹
SR-IOV 使一個單一的功能單元(比如,一個以太網端口)能看起來像多個獨立的物理設備,即支持SR-IOV 功能的物理設備能被配置爲多個功能單元。
SR-IOV 兩種功能(function):
物理功能(Physical Functions,PF):這是完整的帶有 SR-IOV 能力的PCIe 設備。PF 能像普通 PCI 設備那樣被發現、管理和配置。 虛擬功能(Virtual Functions,VF):簡單的 PCIe 功能,它只能處理I/O。每個 VF 都是從 PF 中分離出來的。每個物理硬件都有一個 VF 數目的限制。一個 PF,能被虛擬成多個 VF 用於分配給多個虛擬機。 Hypervisor 能將一個或者多個 VF 分配給一個虛機。在某一時刻,一個 VF 只能被分配給一個虛機。一個虛機可以擁有多個 VF。在虛機的操作系統看來,一個 VF 網卡看起來和一個普通網卡沒有區別。SR-IOV 驅動是在內核中實現的。 網卡 SR-IOV 的例子:
將sriov計算節點的PF虛擬化成多個VF
sriov計算節點選擇光口1(例如 enp5s0f1)作爲sriov網卡
1) 在計算節點上,設置BIOS,對於Intel使支持VT-d,可通過cat /proc/cpuinfo | grep vmx驗證
2) 配置計算節點的/etc/default/grub文件,在GRUB_CMDLINE_LINUX中添加intel_iommu=on來激活VT-d功能,重啓物理機(本環境採用intel 82599系列網卡)
$ cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=bclinux/root rd.lvm.lv=bclinux/swap intel_iommu=on rhgb quiet" GRUB_DISABLE_RECOVERY="true" $ grub2-mkconfig --output=/boot/grub2/grub.cfg $ reboot
3) 本環境中82599網卡最多支持64個vf,擬在每個sriov計算節點虛擬出16個vf供使用命令如下:
# echo '16' > /sys/class/net/enp5s0f1/device/sriov_numvfs ###查看是否生效 # lspci | grep Ethernet 05:00.0 Ethernet controller [0200]: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection [8086:10fb] (rev 01) 05:00.1 Ethernet controller [0200]: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection [8086:10fb] (rev 01) 05:10.1 Ethernet controller [0200]: Intel Corporation 82599 Ethernet Controller Virtual Function [8086:10ed] (rev 01) ...
# ip link show enp5s0f1 5: enp5s0f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT qlen 1000 link/ether 6c:92:bf:04:66:01 brd ff:ff:ff:ff:ff:ff vf 0 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off, query_rss off vf 1 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off, query_rss off vf 2 MAC 00:00:00:00:00:00, spoof checking on, link-state auto, trust off, query_rss off ...
4) 保證重啓後vfs仍然存在,需要將設置vf的數目命令寫入/etc/rc.local,命令如下
# echo "echo '16' > /sys/class/net/enp5s0f1/device/sriov_numvfs" >> /etc/rc.local # chmod +x /etc/rc.local /etc/rc.d/rc.local
5) 修改控制節點nova.conf文件,讓nova-schedule支持對pci passthrough的過濾
# vim /etc/nova/nova.conf enable_filters = RetryFilter, AvailabilityZoneFilter, RamFilter, ComputeFilter, ComputeCapabilitiesFilter, ImagePropertiesFilter, ServerGroupAntiAffinityFilter, ServerGroupAffinityFilter, PciPassthroughFilter available_filters = nova.scheduler.filters.all_filters # systemctl restart openstack-nova-scheduler
配置SRIOV虛機計算節點
1) 安裝neutron-sriov-agent
# yum install openstack-neutron-sriov-nic-agent openstack-neutron
2) 配置neutron.conf 可以將控制節點neutron.conf配置拷貝過來,修改相應參數即可,主要是修改本地管理網ip參數
3) 配置sriov_agent.ini
# vim /etc/neutron/plugins/ml2/sriov_agent.ini [securitygroup] firewall_driver = neutron.agent.firewall.NoopFirewallDriver [sriov_nic] physical_device_mappings = default: enp5s0f1 exclude_devices =
4) 啓動neutron-sriov-agent服務
# systemctl enable neutron-sriov-nic-agent # systemctl start neutron-sriov-nic-agent
5) 修改該節點nova.conf文件,重啓nova-compute
# vim /etc/nova/nova.conf passthrough_whitelist = {"devname": "enp5s0f1", "physical_network": "physnet1"} # systemctl restart openstack-nova-compute
若需要配置多塊SRIOV網卡
[root@controller ~]# vim /etc/nova/nova.conf [pci] passthrough_whitelist = {"devname": "enp129s0f0", "physical_network": "physnet1"} passthrough_whitelist = {"devname": "enp130s0f0", "physical_network": "physnet1"} [root@SRIOV03 ~]# vim /etc/neutron/plugins/ml2/sriov_agent.ini [sriov_nic] physical_device_mappings = physnet1:enp129s0f0,physnet1:enp130s0f0
測試srivo非親和功能
即:設定vm的兩個vnic在同一個非親和組,生成的sriov虛擬機的兩個vnic會分佈在不同的兩個物理SRIOV網卡上
[root@controller ~]# openstack port create --vnic-type direct --binding-profile anti_affinity_group=gwgh729 --network 40fa3655-1dc6-4fa1-8a21-507ae2a92cc5 sriov-port-1
[root@controller ~]# openstack port create --vnic-type direct --binding-profile anti_affinity_group=gwgh729 --network 40fa3655-1dc6-4fa1-8a21-507ae2a92cc5 sriov-port-2 +-----------------------+-----------------------------------------------------------------------------+
[root@controller ~]# nova boot han-sriov-antiaffinity --image 4ce53c0e-b3f5-4463-bdcd-20ee0f74fec6 --flavor 071b6288-8087-4d2e-959a-0b3bbb7fc565 --nic port-id=cb96ed5a-9bbc-46f7-9a44-fdc45e11b25b --nic port-id=d8ae3337-b98a-4523-9665-ed7773c6da90 --availability-zone sriov:SRIOV03
[root@SRIOV03 ~]# ip link show enp130s0f0|grep fa:16:3e:c8:f7:9f [root@SRIOV03 ~]# ip link show enp129s0f0|grep fa:16:3e:c8:f7:9f vf 0 MAC fa:16:3e:c8:f7:9f, vlan 811, spoof checking on, link-state auto, trust off, query_rss off [root@SRIOV03 ~]# ip link show enp130s0f0|grep fa:16:3e:23:0e:45 vf 0 MAC fa:16:3e:23:0e:45, vlan 811, spoof checking on, link-state auto, trust off, query_rss off [root@SRIOV03 ~]# ip link show enp129s0f0|grep fa:16:3e:23:0e:45 [root@SRIOV03 ~]#
mac地址爲fa:16:3e:c8:f7:9f的vnic落在enp129s0f0,mac地址爲fa:16:3e:23:0e:45的vnic落在enp130s0f0