[dpdk-users] Adding multiple fields as key in ip_pipeline application

[Singh, Jasvinder]

Hi Nidhia,


I am developing an application in which I need to use both incoming port and vlan as the key for the flow table. Port field is available at 24th byte of mbuf and vlan(single tagged) will be at 268th byte (128 mbuf + 128 headroom + 12 ethernet header).
How can I represent this in my config file in the src_mask field?
Is there any way to take these fields separately and keep in headroom and then use them to calculate hash for lookup?


[Jasvinder] - If you look at edge_router_upstream.cfg,  pass-through pipeline have mask and offset defined for extracting the key from the packet header and storing in the headroom at the offset 128. This key is used in flow_classification pipeline to classify the flows. You can follow similar approach by using pass-through pipeline doing that action at the input port. For that, define mask (00000000FFFFFFFF)  and offset fields for extracting the vlan-tag from the packet in pass-through pipeline and store at the desired offset in the headroom and  prepend the vlan tag  stored in the metadata with port id read from mbuf.  In flow-classification pipeline, you can specify the headroom offset and mask to read the final key (portid+vlan tag) stored in the packet-metadata for classification. 



Thanks for your reply and help.


Regards,
Nidhia Varghese