[ovs-discuss] ovs module build failing on kernel version 3.11 (ubuntu 13.10).

[Dave Benson]

ovs module build failing on kernel version 3.11 (ubuntu 13.10).

This problem does not occur when building for kernel version 3.13 (ubuntu
14.04).

I performed a fresh clone of OVS, built for debian, installed common
package, tried to install datapath-dkms package - which failed compilation.
 (Originally found this when catching up to latest master while preparing a
patch - created a brand new workspace to confirm the problem.)

Suspect this is due to recent patch named 'datapath: Add support for RHEL-7
/ CentOS-7 kernel.'.  Previously, datapath/inux/compat/include/net/vxlan.h
tested for kernel version 3.12 or better, if true it would include_next
<net/vxlan.h>.  Now it tries to include it even if kernel version is 3.11.
The file net/vxlan.h does not exist prior to kernel version 3.12.

What I did:
git clone https://github.com/openvswitch/ovs.git
./boot.sh
./configure
DEB_BUILD_OPTIONS='parallel=3' fakeroot debian/rules binary

Build was successful, then did:
dpkg -i openvswitch-common_2.3.90-1_amd64.deb
dpkg -i openvswitch-datapath-dkms_2.3.90-1_all.deb

Output as follows:
(Reading database ... 451459 files and directories currently installed.)
Preparing to replace openvswitch-datapath-dkms 2.1.90-PBBR1.1 (using
openvswitch-datapath-dkms_2.3.90-1_all.deb) ...

-------- Uninstall Beginning --------
Module:  openvswitch
Version: 2.1.90
Kernel:  3.11.0-26-generic (x86_64)
-------------------------------------

Status: Before uninstall, this module version was ACTIVE on this kernel.

openvswitch.ko:
 - Uninstallation
   - Deleting from: /lib/modules/3.11.0-26-generic/updates/dkms/
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.

depmod......

DKMS: uninstall completed.

------------------------------
Deleting module version: 2.1.90
completely from the DKMS tree.
------------------------------
Done.
Unpacking replacement openvswitch-datapath-dkms ...
Setting up openvswitch-datapath-dkms (2.3.90-1) ...

Creating symlink /var/lib/dkms/openvswitch/2.3.90/source ->
                 /usr/src/openvswitch-2.3.90

DKMS: add completed.

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area....(bad exit status: 2)
./configure --with-linux='/lib/modules/3.11.0-26-generic/build' && make -C
datapath/linux..........(bad exit status: 2)
Error! Bad return status for module build on kernel: 3.11.0-26-generic
(x86_64)
Consult /var/lib/dkms/openvswitch/2.3.90/build/make.log for more
information.

emacs /var/lib/dkms/openvswitch/2.3.90/build/make.log&

The following is copied from end of log...

make -C /lib/modules/3.11.0-26-generic/build
M=/var/lib/dkms/openvswitch/2.3.90/build/datapath/linux modules
make[1]: Entering directory `/usr/src/linux-headers-3.11.0-26-generic'
  CC [M]  /var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/actions.o
  CC [M]  /var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/datapath.o
  CC [M]  /var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/dp_notify.o
  CC [M]  /var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/flow.o
  CC [M]
 /var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/flow_netlink.o
  CC [M]  /var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/flow_table.o
  CC [M]  /var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/vport.o
  CC [M]
 /var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/vport-geneve.o
In file included from
/var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/vport-geneve.c:34:0:
/var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/compat/include/net/vxlan.h:11:28:
fatal error: net/vxlan.h: No such file or directory
 #include_next <net/vxlan.h>
                            ^
compilation terminated.
make[2]: ***
[/var/lib/dkms/openvswitch/2.3.90/build/datapath/linux/vport-geneve.o]
Error 1
make[1]: ***
[_module_/var/lib/dkms/openvswitch/2.3.90/build/datapath/linux] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-3.11.0-26-generic'
make: *** [default] Error 2
make: Leaving directory
`/var/lib/dkms/openvswitch/2.3.90/build/datapath/linux'
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