[ovs-git] [openvswitch/ovs] 283276: datapath: compat: Fix build on RHEL 7.5

[GitHub]

  Branch: refs/heads/branch-2.8
  Home:   https://github.com/openvswitch/ovs
  Commit: 28327610eb2b7be1c2b2c67d4a8f5d244aa74ac5
      https://github.com/openvswitch/ovs/commit/28327610eb2b7be1c2b2c67d4a8f5d244aa74ac5
  Author: Yi-Hung Wei <yihung.wei at gmail.com>
  Date:   2018-05-14 (Mon, 14 May 2018)

  Changed paths:
    M acinclude.m4
    M datapath/linux/compat/geneve.c
    M datapath/linux/compat/ip_gre.c
    M datapath/linux/compat/lisp.c
    M datapath/linux/compat/stt.c
    M datapath/linux/compat/vxlan.c
    M datapath/vport-internal_dev.c

  Log Message:
  -----------
  datapath: compat: Fix build on RHEL 7.5

1) OVS datapath compat modules breaks on RHEL 7.5, because it moves
ndo_change_mtu function pointer from 'struct net_device_ops' to
'struct net_device_ops_extended'.

2) RHEL 7.5 introduces the MTU range checking as mentioned in
6c0bf091 ("datapath: use core MTU range checking in core net infra").
However, the max_mtu field is defined in 'struct net_device_extended'
but not in 'struct net_device' as upstream kernel.

This patch defines a new symbol HAVE_RHEL7_MAX_MTU that determines
the previous 2 conditions, and fixes the backport issue.

Signed-off-by: Yi-Hung Wei <yihung.wei at gmail.com>
Acked-by: Lucas Alvares Gomes <lucasagomes at gmail.com>
Signed-off-by: Pravin B Shelar <pshelar at ovn.org>



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