On Tue, Aug 14, 2018 at 10:22:29PM +0800, ychen wrote:
> b. as we can see, we will use default group select method
> FIRST QUESTION: why we not use udp port for hash calculate? in function
> flow_hash_symmetric_l4(), we can see the following code:
> if (fields.eth_type == htons(ETH_TYPE_IP)) {
> fields.ipv4_addr = flow->nw_src ^ flow->nw_dst;
> fields.ip_proto = flow->nw_proto;
> if (fields.ip_proto == IPPROTO_TCP || fields.ip_proto ==
> IPPROTO_SCTP) {
> fields.tp_port = flow->tp_src ^ flow->tp_dst;
> }
> }
Did you read the comment just above that code?
> c. when send packet out from userspace vxlan port, it will first do group
> select, then build the total tunnel packet and send out
> SECOND QUESTION: how can we use the tunnel src port to do group hash?
> when packet do xlate in function xlate_select_group(), flow->tp_src is always > 0
I believe that you can get a second shot at the packet in the physical
bridge. See Documentation/howto/userspace-tunneling.rst.
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