Hi Jeff, RFNoC3 / UHD 3.15 does not support metadata. That is a new feature in RFNoC4 / UHD 4.0, so option 2 is not possible.
If you want to send out metadata in RFNoC3, I would suggest prepending it to packets you send to AXI wrapper. You can still use SIMPLE_MODE as long as you are producing a packet for every packet consumed. The different input/output packet lengths do not matter as AXI wrapper internally calculates the output packet length and updates the header automatically. Jonathon On Fri, Dec 11, 2020 at 3:48 PM Hodges, Jeff via USRP-users < usrp-users@lists.ettus.com> wrote: > I meant rfnoc_create_verilog.py > > > > https://github.com/EttusResearch/uhd/blob/master/host/utils/rfnoc_blocktool/rfnoc_create_verilog.py > > > jeff > ------------------------------ > *From:* Hodges, Jeff > *Sent:* Friday, December 11, 2020 3:44:41 PM > *To:* usrp-users@lists.ettus.com > *Subject:* RFNoC passing metadata on the dataplane > > > I'd like to pass metadata over the dataplane using the available space in > the CHDR header. However, I cannot find an easy way to do this using > UHD3.15. > > > I've identified two possible approaches but I'm not sure either will work: > (1) Set AXI_Wrapper (Simple_Mode =0) to require user provided CHDR header. > It's unclear how to provide the header, and if this can be modified quickly. > > (2) Expose the AXI-Stream CHDR interface the way UHD4.0 does it: > > In UHD4.0 the verilog_image_builder.py includes the options to expose HDL > interface: > > o Definition: Which HDL interface to expose > o Options: “AXI-Stream CHDR” (axis_chdr), “AXI-Stream Payload Context” > (axis_pyld_ctxt), or “AXI-Stream Data” (axis_data) > > If Option (2) is the recommended, can I just copy the code from > verilog_image_builder.py TEMPLATE such as below, or were other changes made > to make it incompatible with 3.15? > > %if config['data']['fpga_iface'] == > "axis_pyld_ctxt": > assign axis_data_clk = > ${config['data']['clk_domain']}_clk; > assign axis_data_rst = > ${config['data']['clk_domain']}_rst; > <%include file="/modules/axis_pyld_ctxt_modules_template.mako"/> > > > > Thanks, > > Jeff > > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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