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Hello Bob – An example application for the FPX

Hello Bob – An example application for the FPX. Applied Research Laboratory Washington University, St. Louis http://www.arl.wustl.edu/arl/projects/fpx florian@arl.wustl.edu. Overview. Full FPX application (incl. RAD) Parse UDP datagrams (using higher level framework)

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Hello Bob – An example application for the FPX

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  1. Hello Bob – An example application for the FPX Applied Research Laboratory Washington University, St. Louis http://www.arl.wustl.edu/arl/projects/fpx florian@arl.wustl.edu

  2. Overview • Full FPX application (incl. RAD) • Parse UDP datagrams (using higher level framework) • Send datagram back (UDP Echo) • String match (“Hello”) • Use SRAM interface (to read name) • Replace data

  3. Replacing the content

  4. Simplified example • Assume continuous data (easier for SRAM access) • Limit name length to 14 characters (incl. \0) • Name will fit in first cell • Don’t resize datagram (check for length)

  5. Hello Bob Tarball • Download “hellobob.tar.gz” from http://www.arl.wustl.edu/arl/projects/fpx/workshop_0101/hellobob.tar.gz(save under D:\) • Unpack • “cd d:” • “tar xvzf hellobob.tar.gz” • Archive contains tree below FPX_TREE/RAD

  6. Compiling fpxlib • Go to subdirectory “HelloBob/MODULES/LIB” • Compile processors by typing “make compile” in: • CellProcessor/sim • FrameProcessor/sim • IPProcessor/sim • UDPProcessor/sim

  7. Dataflow HelloBob/MODULES/HelloBob/vhdl/hello_bob.vhdl

  8. Memory access • Request memory when we receive frame • Sample grant (and store it) before we access memory • Save SRAM_GRANT on SOD • If we don’t get a grant use “John Doe” • Release memory after processing name

  9. Statemachines

  10. HelloBob module HelloBob/MODULES/HelloBob/vhdl/module.vhdl

  11. RAD core HelloBob/TOP/RAD_HelloBob/vhdl/rad_hellobob.vhdl

  12. Testbench HelloBob/TOP/RAD_HelloBob/sim/testbench.vhdl

  13. Compile Testbench • Go to subdirectory “HelloBob/TOP/RAD_HelloBob/sim” • Compile RAD and testbench by typing “make compile”

  14. Hello Bob • Send control cell to write “Bob” to SRAM • Is read from EGRESSIN.DAT • Send UDP datagram with “Hello…..” • Is read from INGRESSIN.DAT • Datagram with “Hello Bob” should return • IP addresses and UDP ports should be swapped

  15. Start simulator • Go to subdirectory “HelloBob/TOP/RAD_HelloBob/sim” • Type “make sim” (simulator starts up) • Type “do testbench.do” (starts simulation)

  16. Exercises • Implement Memory Statemachine • Generate SRAM_REQ • Sample SRAM_GRANT • Replace payload with name • Check terminating \0 • Watch for “o_” and shift HelloBob/MODULES/HelloBob/vhdl/hello_bob.vhdl

  17. Dataflow

  18. Testfiles • PROBE.DAT probe-request • SETVCI51.DAT control cell to change VCI from 0x32 to 0x33 • SRAM_BOB.DAT write name “Bob” to SRAM • UDP7HELLO.DAT datagram with “Hello” on port 7 • UDP7SALUT.DAT datagram with “Salut” on port 7 • UDP8HELLO.DAT datagram with “Hello” on port 8 • UDP51HELLO.DAT datagram with “Hello” on port 7, but VCI 0x33 (51) • UDP0HELLO.DAT TTL field is zero

  19. Other tests • Send “Salut” instead of “Hello” (UDP7SALUT.DAT) • Type “cp UDP7SALUT.DAT INGRESSIN.DAT” • Run test again • Use port 8 instead of 7 (UDP8HELLO.DAT) • NOTE: testdata to HelloBob is read from INGRESSIN.DAT, testdata to the CCP is read from EGRESSIN.DAT

  20. Hello <Your Name> • Login to jeeves (login on two terminals) • User: workshop## ex:workshop71(port 7 stack 1) • Password: workshop## • Invoking fpx_control • fpx_control fpx_number ex: fpx_control 7.1 • Writing String • enable rad logging: g rad • Write string: ws mod_num address ‘your name’ ex: ws 1 0 ‘Bob Smith’

  21. Hello <Your Name> (cont) • Open log_file in second terminal • vi rad_log_xx.txt • Copy cell to clipboard • Highlight cell in vi • Right click on xterm in toolbar • Edit -> Copy X Selection -> To Clipboard • Paste Selection in notepad • Start -> Run -> notepad • Edit -> Paste • Save file as “EGRESSIN.DAT”

  22. Different application VCI • We will change the application VCI (0x32 to 0x33) by sending a control cell to the CellProcessor • Create a new INGRESSIN.DAT from SETVCI51.DAT and UDP7HELLO.DAT • Type “cat SETVCI51.DAT UDP7HELLO.DAT > INGRESSIN.DAT” • Use UDP packet on channel 0x33 (51): UDP51HELLO.DAT

  23. Probe Request • Sending a Probe-Request to the CellProcessor results in a “Generic CellProcessor Version 1.0” response • Use PROBE.DAT to send control cell

  24. Change Probe Response • Change Probe Response in CellProcessor to “Hello Bob Version 1.0” HelloBob/MODULES/LIB/CellProcessor/vhdl/cellproc.vhdl

  25. AAL5 Errors • Change payload word, do not change the CRC • CRC field is non-zero (=error) in FrameProcessor

  26. TTL of zero • IP packets with TTL==zero are dropped (UDP0HELLO.DAT) • Frame does not appear on data output

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