dpdk在虚拟机上出错处理

正文

DPDK介绍见：www.dpdk.org

本文介绍的步骤基本适用于dpdk 1.7.0 - dpdk 2.0.0 各版本。只是setup.sh显示的菜单有一些小的不同；
同样的，也适用于ubuntu更高版本（已在ubuntu 12.04+及14.04上验证过)

1. 所用系统与软件版本

系统：Ubuntu 12.04.3 LTS 64位， CentOS Linux release 7.0.1406 64位
dpdk: 1.7.0 (下载页）

dpdk 1.7.1 经过试验，发现在这两个系统上都有问题，运行各示例程序都有以下错误
EAL: Error reading from file descriptor

这个bug已经由dpdk的开发人员修复，patch内容如下：

diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c

index d1ca26e..c46a00f 100644

--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c

+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c

@@ -505,14 +505,11 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)

         }

         /* fall back to INTX */

     case RTE_INTR_MODE_LEGACY:

-        if (pci_intx_mask_supported(dev)) {

-            dev_dbg(&dev->dev, "using INTX");

-            udev->info.irq_flags = IRQF_SHARED;

-            udev->info.irq = dev->irq;

-            udev->mode = RTE_INTR_MODE_LEGACY;

-            break;

-        }

-        dev_notice(&dev->dev, "PCI INTX mask not supported\n");

+        dev_dbg(&dev->dev, "using INTX");

+        udev->info.irq_flags = IRQF_SHARED;

+        udev->info.irq = dev->irq;

+        udev->mode = RTE_INTR_MODE_LEGACY;

+        break;

         /* fall back to no IRQ */

     case RTE_INTR_MODE_NONE:

         udev->mode = RTE_INTR_MODE_NONE;

在虚拟机里使用时，打上以上的补丁，或手工修改文件后重新编译即可。

回到顶部

2. 虚拟机配置

虚拟机软件：VMWare WorkStation 10.0.1 build-1379776
CPU： 2个CPU，每个CPU2个核心
内存： 1GB+
网卡：intel网卡*2，用于dpdk试验；另一块网卡用于和宿主系统进行通信

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3. Ubuntu 12.04上的配置

3.1 准备

需要安装gcc及其他一些小工具等，默认都有了，没有的话运行sudo apt-get install装一下。dkdk的一些脚本用到了python，也装一下。

3.2 通过setup脚本进行配置

首先运行su切换到root权限，root没有开的话使用

sudo passwd root

来开一下。

dpdk提供了一个方便的配置脚本： <dpdk>/tools/setup.sh，通过它可以方便地配置环境。
1）设置环境变量，这里是linux 64位的配置

export RTE_SDK=<dpdk主目录>

export RTE_TARGET=x86_64-native-linuxapp-gcc

2）运行setup.sh，显示如下

------------------------------------------------------------------------------

 RTE_SDK exported as /home/hack/dpdk-1.7.0

------------------------------------------------------------------------------

----------------------------------------------------------

 Step 1: Select the DPDK environment to build

----------------------------------------------------------

[1] i686-native-linuxapp-gcc

[2] i686-native-linuxapp-icc

[3] x86_64-ivshmem-linuxapp-gcc

[4] x86_64-ivshmem-linuxapp-icc

[5] x86_64-native-bsdapp-gcc

[6] x86_64-native-linuxapp-gcc

[7] x86_64-native-linuxapp-icc

----------------------------------------------------------

 Step 2: Setup linuxapp environment

----------------------------------------------------------

[8] Insert IGB UIO module

[9] Insert VFIO module

[10] Insert KNI module

[11] Setup hugepage mappings for non-NUMA systems

[12] Setup hugepage mappings for NUMA systems

[13] Display current Ethernet device settings

[14] Bind Ethernet device to IGB UIO module

[15] Bind Ethernet device to VFIO module

[16] Setup VFIO permissions

----------------------------------------------------------

 Step 3: Run test application for linuxapp environment

----------------------------------------------------------

[17] Run test application ($RTE_TARGET/app/test)

[18] Run testpmd application in interactive mode ($RTE_TARGET/app/testpmd)

----------------------------------------------------------

 Step 4: Other tools

----------------------------------------------------------

[19] List hugepage info from /proc/meminfo

----------------------------------------------------------

 Step 5: Uninstall and system cleanup

----------------------------------------------------------

[20] Uninstall all targets

[21] Unbind NICs from IGB UIO driver

[22] Remove IGB UIO module

[23] Remove VFIO module

[24] Remove KNI module

[25] Remove hugepage mappings

[26] Exit Script

选择6，进行编译

3）选择8，插入igb_uio模块

4）选择11，配置大页内存（非NUMA），选择后会提示你选择页数，输入64，128什么的即可

Removing currently reserved hugepages

Unmounting /mnt/huge and removing directory

  Input the number of 2MB pages

  Example: to have 128MB of hugepages available, enter '64' to

  reserve 64 * 2MB pages

Number of pages: 128

选择19，可以确认一下大页内存的配置：

AnonHugePages:         0 kB

HugePages_Total:     128

HugePages_Free:      128

HugePages_Rsvd:        0

HugePages_Surp:        0

Hugepagesize:       2048 kB

5）选择14，绑定dpdk要使用的网卡

Network devices using DPDK-compatible driver

============================================

<none>

Network devices using kernel driver

===================================

0000:02:01.0 '82545EM Gigabit Ethernet Controller (Copper)' if=eth0 drv=e1000 unused=igb_uio *Active*

0000:02:06.0 '82545EM Gigabit Ethernet Controller (Copper)' if=eth1 drv=e1000 unused=igb_uio

0000:02:07.0 '82545EM Gigabit Ethernet Controller (Copper)' if=eth2 drv=e1000 unused=igb_uio 

Other network devices

=====================

<none>

Enter PCI address of device to bind to IGB UIO driver: 0000:02:06.0

绑定好后，选择13，可以查看当前的网卡配置：

Network devices using DPDK-compatible driver

============================================

0000:02:06.0 '82545EM Gigabit Ethernet Controller (Copper)' drv=igb_uio unused=e1000

0000:02:07.0 '82545EM Gigabit Ethernet Controller (Copper)' drv=igb_uio unused=e1000

Network devices using kernel driver

===================================

0000:02:01.0 '82545EM Gigabit Ethernet Controller (Copper)' if=eth0 drv=e1000 unused=igb_uio *Active*

Other network devices

=====================

<none>

6）选择18，运行testpmd测试程序

注意，运行这个测试程序，虚拟机最好提供2个网卡用于dpdk。

  Enter hex bitmask of cores to execute testpmd app on

  Example: to execute app on cores 0 to 7, enter 0xff

bitmask: f

如果没问题，按回车后会出现以下输出：

Launching app

EAL: Detected lcore 0 as core 0 on socket 0

EAL: Detected lcore 1 as core 1 on socket 0

EAL: Detected lcore 2 as core 0 on socket 0

EAL: Detected lcore 3 as core 1 on socket 0

EAL: Support maximum 64 logical core(s) by configuration.

EAL: Detected 4 lcore(s)

EAL: Setting up memory...

EAL: Ask a virtual area of 0xf000000 bytes

EAL: Virtual area found at 0x7fe828000000 (size = 0xf000000)

EAL: Ask a virtual area of 0x200000 bytes

EAL: Virtual area found at 0x7fe827c00000 (size = 0x200000)

EAL: Ask a virtual area of 0x200000 bytes

EAL: Virtual area found at 0x7fe827800000 (size = 0x200000)

EAL: Ask a virtual area of 0x800000 bytes

EAL: Virtual area found at 0x7fe826e00000 (size = 0x800000)

EAL: Ask a virtual area of 0x400000 bytes

EAL: Virtual area found at 0x7fe826800000 (size = 0x400000)

EAL: Requesting 128 pages of size 2MB from socket 0

EAL: TSC frequency is ~3292453 KHz

EAL: Master core 0 is ready (tid=37c79800)

EAL: Core 3 is ready (tid=24ffc700)

EAL: Core 2 is ready (tid=257fd700)

EAL: Core 1 is ready (tid=25ffe700)

EAL: PCI device 0000:02:01.0 on NUMA socket -1

EAL:   probe driver: 8086:100f rte_em_pmd

EAL:   0000:02:01.0 not managed by UIO driver, skipping

EAL: PCI device 0000:02:06.0 on NUMA socket -1

EAL:   probe driver: 8086:100f rte_em_pmd

EAL:   PCI memory mapped at 0x7fe837c23000

EAL:   PCI memory mapped at 0x7fe837c13000

EAL: PCI device 0000:02:07.0 on NUMA socket -1

EAL:   probe driver: 8086:100f rte_em_pmd

EAL:   PCI memory mapped at 0x7fe837bf3000

EAL:   PCI memory mapped at 0x7fe837be3000

Interactive-mode selected

Configuring Port 0 (socket 0)

Port 0: 00:0C:29:14:50:CE

Configuring Port 1 (socket 0)

Port 1: 00:0C:29:14:50:D8

Checking link statuses...

Port 0 Link Up - speed 1000 Mbps - full-duplex

Port 1 Link Up - speed 1000 Mbps - full-duplex

Done

testpmd>

输入start，开始包转发

testpmd> start

  io packet forwarding - CRC stripping disabled - packets/burst=32

  nb forwarding cores=1 - nb forwarding ports=2

  RX queues=1 - RX desc=128 - RX free threshold=0

  RX threshold registers: pthresh=8 hthresh=8 wthresh=0

  TX queues=1 - TX desc=512 - TX free threshold=0

  TX threshold registers: pthresh=32 hthresh=0 wthresh=0

  TX RS bit threshold=0 - TXQ flags=0x0

输入stop，停止包转发，这时会显示统计信息

testpmd> stop

Telling cores to stop...

Waiting for lcores to finish...

  ---------------------- Forward statistics for port 0  ----------------------

  RX-packets: 5544832        RX-dropped: 0             RX-total: 5544832

  TX-packets: 5544832        TX-dropped: 0             TX-total: 5544832

  ----------------------------------------------------------------------------

  ---------------------- Forward statistics for port 1  ----------------------

  RX-packets: 5544832        RX-dropped: 0             RX-total: 5544832

  TX-packets: 5544832        TX-dropped: 0             TX-total: 5544832

  ----------------------------------------------------------------------------

  +++++++++++++++ Accumulated forward statistics for all ports+++++++++++++++

  RX-packets: 11089664       RX-dropped: 0             RX-total: 11089664

  TX-packets: 11089664       TX-dropped: 0             TX-total: 11089664

  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Done.

3.3 通过命令配置

最好切换到root权限。

1）编译dpdk

进入dpdk主目录<dpdk>，输入

make install T=x86_64-native-linuxapp-gcc

进行编译

2）配置大页内存（非NUMA）

echo 128 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages

mkdir /mnt/huge

mount -t hugetlbfs nodev /mnt/huge

可以用以下命令查看大页内存状态：

cat /proc/meminfo | grep Huge

3）安装igb_uio驱动

modprobe uio

insmod x86_64-native-linuxapp-gcc/kmod/igb_uio.ko

4）绑定网卡

先看一下当前网卡的状态

 ./tools/dpdk_nic_bind.py --status

Network devices using DPDK-compatible driver

============================================

<none>

Network devices using kernel driver

===================================

0000:02:01.0 '82545EM Gigabit Ethernet Controller (Copper)' if=eth0 drv=e1000 unused=igb_uio *Active*

Other network devices

=====================

0000:02:06.0 '82545EM Gigabit Ethernet Controller (Copper)' unused=e1000,igb_uio

0000:02:07.0 '82545EM Gigabit Ethernet Controller (Copper)' unused=e1000,igb_uio

进行绑定：

./tools/dpdk_nic_bind.py -b igb_uio 0000:02:06.0

./tools/dpdk_nic_bind.py -b igb_uio 0000:02:07.0

如果网卡有接口名，如eth1, eth2, 也可以在-b igb_uio后面使用接口名，而不使用pci地址。

5）运行testpmd测试程序

 ./x86_64-native-linuxapp-gcc/app/testpmd -c 0x3 -n 2 -- -i

6）编译运行其他示例程序

<dpdk>/examples下面有很多示例程序，这些程序在dpdk编译时，没有被编译。这里以编译helloworld为例，首先要设置环境变量：

export RTE_SDK=<dpdk主目录>

export RTE_TARGET=x86_64-native-linuxapp-gcc

之后进入<dpdk>/examples/helloworld，运行make，成功会生成build目录，其中有编译好的helloworld程序。

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4. CentOS 7.0上的配置

4.1 准备

安装CentOS虚拟机时，如果选择minimal安装，还需要安装其下的基本开发工具集(含gcc，python等）

另外，dpdk提供的dpdk_nic_bind.py脚本中会调用到lspci命令，这个默认没有安装，运行以下命令安装(不安装此工具则无法绑定网卡）：

yum install pciutils

ifconfig默认也没有安装，如果想用它，应运行：

yum install net-tools

在CentOS上，要绑定给dpdk使用的网卡在绑定前，可能是活动的(active)，应将其禁用，否则无法绑定。禁用的一种方式是运行：

ifconfig eno33554984 down

eno33554984是接口名，如同eth0一样。

在CentOS上使用setup.sh和通过命令编译和配置dpdk的过程与Ubuntu一样，这里就从略了。