Control the flow of RoCE v2 by "Flow Programming"

Hello all,
We’ve done so many tests on “dns_filter” app and we really wish it can help us to control the flow of RoCE v2. After some tests on it,we find that only when turning off the offloading of OVS and changing the dst_port(4791) of the flow,can we use the dns_filter app to forward this kind of offloading traffic.However the speed of RoCE v2 fell down to 30MB/S from 2700MB/s after turning off the offloading function of OVS. We really don’t want low speed of RoCE v2 ,so is it possible for us to control the flow of RoCE v2 by “Flow Programming” when offloading the OVS? Really need your help,please.