Virtualbox Linux drivers cannot be built with 5.11 kernel

[cloudsw]

Failed to rebuild drivers after installing 5.11 kernel:

$sudo vboxconfig vboxdrv.sh: Stopping VirtualBox services. vboxdrv.sh: Starting VirtualBox services. vboxdrv.sh: Building VirtualBox kernel modules. vboxdrv.sh: failed: Look at /var/log/vbox-setup.log to find out what went wrong.

There were problems setting up VirtualBox. To re-start the set-up process, run

/sbin/vboxconfig

as root. If your system is using EFI Secure Boot you may need to sign the kernel modules (vboxdrv, vboxnetflt, vboxnetadp, vboxpci) before you can load them. Please see your Linux system's documentation for more information.

vbox-setup.log is attached

/tmp/vbox.0/linux/VBoxNetFlt-linux.c: In function ‘vboxNetFltNeedsLinkState’: /tmp/vbox.0/linux/VBoxNetFlt-linux.c:1761:47: error: dereferencing pointer to incomplete type ‘const struct ethtool_ops’

1761 | if (pDev->ethtool_ops && pDev->ethtool_ops->get_drvinfo)

| ^~

/tmp/vbox.0/linux/VBoxNetFlt-linux.c:1763:32: error: storage size of ‘Info’ isn’t known

1763 | struct ethtool_drvinfo Info;

| ^~

/tmp/vbox.0/linux/VBoxNetFlt-linux.c:1766:20: error: ‘ETHTOOL_GDRVINFO’ undeclared (first use in this function)

1766 | Info.cmd = ETHTOOL_GDRVINFO;

| ^~

/tmp/vbox.0/linux/VBoxNetFlt-linux.c:1766:20: note: each undeclared identifier is reported only once for each function it appears in /tmp/vbox.0/linux/VBoxNetFlt-linux.c:1763:32: warning: unused variable ‘Info’ [-Wunused-variable]

1763 | struct ethtool_drvinfo Info;

| ^~

make[2]: * [scripts/Makefile.build:279: /tmp/vbox.0/linux/VBoxNetFlt-linux.o] Error 1 make[1]: * [Makefile:1800: /tmp/vbox.0] Error 2 make: * vboxnetflt Error 2