[daily][dpdk] 内核模块(网卡驱动)无法卸载

由于程序的异常退出, 内核的引用计数没有被清除(我猜的). 所以驱动不能被卸载掉, 强制也不行.

如下:

[root@localhost ~]# insmod /opt/scorpion/KingKong/kmod/igb_uio.ko 
insmod: error inserting '/opt/scorpion/KingKong/kmod/igb_uio.ko': -1 File exists
You have new mail in /var/spool/mail/root
[root@localhost ~]# rmmod /opt/scorpion/KingKong/kmod/igb_uio.ko [root@localhost ~]# insmod /opt/scorpion/KingKong/kmod/igb_uio.ko 

ERROR: Module igb_uio is in use
[root@localhost ~]# rmmod -f /opt/scorpion/KingKong/kmod/igb_uio.ko 
ERROR: Removing 'igb_uio': Resource temporarily unavailable
insmod: error inserting '/opt/scorpion/KingKong/kmod/igb_uio.ko': -1 File exists
You have new mail in /var/spool/mail/root
[root@localhost ~]# rmmod /opt/scorpion/KingKong/kmod/igb_uio.ko 
ERROR: Module igb_uio is in use
[root@localhost ~]# rmmod -f /opt/scorpion/KingKong/kmod/igb_uio.ko 
ERROR: Removing 'igb_uio': Resource temporarily unavailable

因为 -f 参数实际上是没有起作用的. 可以修改内存参数使其其作用, 这样就能强制卸载了.

这个参数的名字是: 

CONFIG_MODULE_FORCE_UNLOAD

[root@T185 ~]# cat /boot/config-3.4.68-1.el6.x86_64  |grep FORCE_UNLOAD
# CONFIG_MODULE_FORCE_UNLOAD is not set
[root@T185 ~]# 

不过需要重新编译内核才行.