commit ad6295aecbb1cd0ab9e026f951b24b9a7a59bd42
Author: Jarod Wilson <jarod@redhat.com>
Date:   Tue Jun 26 09:35:08 2018 -0400

    Fix MTU limiting for IPoIB in datagram mode
    
    RHEL-only
    
    Signed-off-by: Jarod Wilson <jarod@redhat.com>

diff --git a/redhat/rdma.ifup-ib b/redhat/rdma.ifup-ib
index bb4d4f71..3779e13f 100644
--- a/redhat/rdma.ifup-ib
+++ b/redhat/rdma.ifup-ib
@@ -117,7 +117,7 @@ if [ -e /sys/class/net/${DEVICE}/mode ]; then
         echo datagram > /sys/class/net/${DEVICE}/mode
 	# cap the MTU where we should based upon mode
 	[ -z "$MTU" ] && MTU=2044
-	[ "$MTU" -gt 2044 ] && MTU=2044
+	[ "$MTU" -gt 4092 ] && MTU=4092
     fi
 fi