OVS DPDK DMA-Dev library/Design Discussion

[Mcnamara, John]

      -----Original Appointment-----
      From: Stokes, Ian <ian.stokes at intel.com>
      Sent: Thursday, March 24, 2022 3:37 PM
      To: Stokes, Ian; Pai G, Sunil; Hu, Jiayu; Ferriter, Cian; Van Haaren, Harry; Ilya Maximets; Maxime Coquelin (maxime.coquelin at redhat.com); ovs-dev at openvswitch.org; dev at dpdk.org
      Cc: Mcnamara, John; O'Driscoll, Tim; Finn, Emma
      Subject: OVS DPDK DMA-Dev library/Design Discussion
      When: 29 March 2022 14:00-15:00 (UTC+00:00) Dublin, Edinburgh, Lisbon, London.
      Where: Google Meet


      Hi All,

      This meeting is a follow up to the call earlier this week.

      This week Sunil presented 3 different approaches to integrating DMA-Dev with OVS along with the performance impacts.

      https://github.com/Sunil-Pai-G/OVS-DPDK-presentation-share/blob/main/OVS%20vhost%20async%20datapath%20design%202022.pdf

      The approaches were as follows:

*       Defer work.
*       Tx completions from Rx context.
*       Tx completions from Rx context + lockless ring.

      The pros and cons of each approach were discussed but there was no clear solution reached.

      As such a follow up call was suggested to continue discussion and to reach a clear decision on the approach to take.

      Please see agenda as it stands below:

      Agenda
*       Opens
*       Continue discussion of 3x approaches from last week (Defer work, "V3", V4, links to patches in Sunil's slides above)
*       Design Feedback (please review solutions of above & slide-deck from last week before call to be informed)
*       Dynamic Allocation of DMA engine per queue
*       Code Availability (DPDK GitHub, OVS GitHub branches)

      Please feel free to respond with any other items to be added to the agenda.

      Google Meet: https://meet.google.com/hme-pygf-bfb

      Regards
      Ian

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