install.sh doesn't remove the old igb_uio module and install the new one when compiling dpdk

[lyuxiaosu]

Bug Report

Current Behavior
install.sh doesn't reinstall igb_uio module generated by dpdk if it finds the system has already installed one. Since dpdk provides the driver of igb_uio which might be often updated, the old igb_uio module should be removed and replaced by the dpdk's. This can cause a run-time error for running dpdk_iface_main to create a dpdk-iface device.

Expected behavior/code
igb_uio module should be removed and re-installed at each time of compiling dpdk

Steps to reproduce

• Apply for a new machine or reboot a machine from cloudlab, the system has already installed a default igb_uio, use grep -m 1 "igb_uio" /proc/modules to display:

igb_uio 2446317 0 - Live 0x0000000000000000 (OX)

• Then run install.sh to compile dpdk, and use grep -m 1 "igb_uio" /proc/modules to display again:

igb_uio 2446317 0 - Live 0x0000000000000000 (OX)

The old igb_uio module was not replaced by the new one.

• Run setup_mtcp_onvm_env.sh to create a dpdk-iface device, an error happened:

xiaosuGW@node2:~/mtcp$ ./setup_mtcp_onvm_env.sh
Checking ldflags.txt...
RTE_SDK env variable is set to /users/xiaosuGW/openNetVM-dev/dpdk
RTE_TARGET env variable is set to x86_64-native-linuxapp-gcc
Are you using an Intel NIC (y/n)? y
Creating dpdk interface entries
make -C /lib/modules/3.13.0-117-generic/build/ M=/users/xiaosuGW/mtcp/dpdk-iface-kmod modules
make[1]: Entering directory `/usr/src/linux-headers-3.13.0-117-generic'
  Building modules, stage 2.
  MODPOST 1 modules
make[1]: Leaving directory `/usr/src/linux-headers-3.13.0-117-generic'
make -C /lib/modules/3.13.0-117-generic/build/ M=/users/xiaosuGW/mtcp/dpdk-iface-kmod modules
make[1]: Entering directory `/usr/src/linux-headers-3.13.0-117-generic'
  Building modules, stage 2.
  MODPOST 1 modules
make[1]: Leaving directory `/usr/src/linux-headers-3.13.0-117-generic'
sudo ./dpdk_iface_main
Removing existing device node entry... not present.
Creating device node entry... done.
Setting permissions on the device node entry... done.
Scanning the system for dpdk-compatible devices... done.
Clearing previous entries
ioctl call failed!
make: *** [run] Error 1

Environment

• OS: cloudlab machines
• onvm version: develop branch with commit e305489b76c868e722470c7799625de90d5f37bb
• dpdk version: 18.11.0
• mtcp: branch onvm_build_readme_fix

Possible Solution
Removing the old igb_uio and re-installing the new one under $RTE_SDK/$RTE_TARGET/kmod can resolve this problem.

[koolzz]

This just confirms that we need to fix our install script. I'll look into this.