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Please backport the following commit needed for BZ 1558567:

commit 65a87968f4cfd9cf7a433a3156d98118078f9e4e
Author: Pablo Cascón <pablo.cascon>
Date:   Fri Apr 27 17:40:49 2018 +0100

    netdev-dpdk: don't enable scatter for jumbo RX support for nfp
    
    Currently to RX jumbo packets fails for NICs not supporting scatter.
    Scatter is not strictly needed for jumbo RX support. This change fixes
    the issue by not enabling scatter only for the PMD/NIC known not to
    need it to support jumbo RX.
    
    Note: this change is temporary and not needed for later releases OVS/DPDK
    
    Reported-by: Louis Peens <louis.peens>
    Signed-off-by: Pablo Cascón <pablo.cascon>
    Reviewed-by: Simon Horman <simon.horman>
    Acked-by: Kevin Traynor <ktraynor>
    Signed-off-by: Ian Stokes <ian.stokes>

Please note there is a later fix related to this commit. It is in the mailing list and hasn't hit master yet:

https://mail.openvswitch.org/pipermail/ovs-dev/2018-May/347089.html

The fix has been verified by running concurrent netperf tests between guests over OVS-dpdk/vxlan/nfp tunnel.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:1962