OVS DPDK DMA-Dev library/Design Discussion

[Stokes, Ian]

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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