Hi all I am interested in add some new header support to OVS.
I find some instructions at the end of this page. https://github.com/openvswitch/ovs/blob/7169d4fdc8e564331c7a5ad910bc1d99cb413712/FAQ.rst I read the OVS code in related parts. Following is my understanding of how the fields are processed: 1. The compiler first parses the enum mf_field_id in meta-flow.h, and read the *comment *in enum mf_field_id to construct the match field id in OXM and NXM. eg. NXM: NXM_NX_MPLS_TTL(30) since v2.6 will make the id of this field as 30 in NXM. 2. The compiler also parses the field name in the comment, and match it with the name in the struct flow?*(this part i am not sure) * eg. MFF_CT_STATE, /* "ct_zone". ..... , this will parse the MFF_CT_STATE in the ct_zone in the struct flow? 3. In run time, miniflow_extract will push the value of different fields in the packet into the corresponding field of the struct flow. 4. Since the compiler already links the field id in step one, so the controller can send the match instruction using the class and id described in step. Questions: 1. am I right for the steps described above 2. I am not sure about what nx_put_raw does. Is it used for parsing the enum mf_field_id and its comment? 3. Is it ok that I add a new field, eg. MFF_MY_Field. NXM: NXM_NX_MY_FIELD(#ID). and the #ID is not same as the ids already defined in the enum mf_field_id? 4. Is there any experimenter match class api i can use? 6. If at the switch side, I have MFF_MY_Field. NXM: NXM_NX_MY_FIELD(#ID) ready, At the controller side, I just need to construct the oxm_fields according to the setup in the switch. 7. There is two NXM class in OXM class: OFPXMC_NXM_0 OFPXMC_NXM_1. How should I define the class of my match in these two? 5. Is there any more detailed explanation or tutorial that I can learn about how to do this? (PS: https://github.com/openvswitch/ovs/blob/7169d4fdc8e564331c7a5ad910bc1d99cb413712/FAQ.rst This information seems a little out of date, because In 2.7 the "struct flow" is defined in the include/openvswitch/flow.h, and the enum mf_field_id is in include/openvswitch/flow.h.) THANKS IN ADVANCE !!!! Yours Charles
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