[ovs-git] [openvswitch/ovs] 52d12c: rhel7.6: Support kmod build and load for mulitple ...

[yifsun]

  Branch: refs/heads/master
  Home:   https://github.com/openvswitch/ovs
  Commit: 52d12cc4590d5b95505a21d3508586db3bb35d07
      https://github.com/openvswitch/ovs/commit/52d12cc4590d5b95505a21d3508586db3bb35d07
  Author: Yifeng Sun <pkusunyifeng at gmail.com>
  Date:   2019-06-05 (Wed, 05 Jun 2019)

  Changed paths:
    M rhel/openvswitch-kmod-fedora.spec.in
    M rhel/usr_share_openvswitch_scripts_ovs-kmod-manage.sh

  Log Message:
  -----------
  rhel7.6: Support kmod build and load for mulitple kernel versions

RHEL 7.6's new kernel 3.10.0-957.12.1.el7 introduced some ABI changes.
This leads to an issue that OVS kernel module built against
kernels newer than 12.1 cannot be loaded on systems running kernels
older than 12.1, vice versa.

By inspecting datapath/linux/openvswitch.mod.c, signatures of
the following kernel functions have changed in 3.10.0-957.12.1.el7:
    nf_ct_get_tuple
    nf_ct_invert_tuplepr
    __nf_ct_l4proto_find

This patch enables OVS to build kernel modules against multiple
kernel versions and enables RHEL 7.6 system to load the compatible
module at runtime.

make rpm-fedora-kmod \
    RPMBUILD_OPT='-D "kversion 3.10.0-957.10.1.el7.x86_64 \
    3.10.0-957.12.1.el7.x86_64"'

Acked-by: Yi-Hung Wei <yihung.wei at gmail.com>
Signed-off-by: Yifeng Sun <pkusunyifeng at gmail.com>
Signed-off-by: Ben Pfaff <blp at ovn.org>