[dpdk-dev] NTT TechnoCross roadmap for 21.02

[Hideyuki Yamashita <yamashita.hideyuki@ntt-tx.co.jp>]

Hello,

Following are the work items planned for 21.02 from NTT TechnoCross:
I will try to post patch set after 20.11 is released.

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1) Introduce API stats function
In general, DPDK application consumes CPU usage because it polls
incoming packets using rx_burst API in infinite loop.
This makes difficult to estimate how much CPU usage is really
used to send/receive packets by the DPDK application.

For example, even if no incoming packets arriving, CPU usage
looks nearly 100% when observed by top command. 

It is beneficial if developers can observe real CPU usage of the 
DPDK application.
Such information can be exported to monitoring application like 
prometheus/graphana and shows CPU usage graphically.

To achieve above, this patch set provides apistats functionality.
apistats provides the followiing two counters for each lcore.
- rx_burst_counts[RTE_MAX_LCORE]
- tx_burst_counts[RTE_MAX_LCORE]
Those accumulates rx_burst/tx_burst counts since the application starts.

By using those values, developers can roughly estimate CPU usage.
Let us assume a DPDK application is simply forwarding packets.
It calls tx_burst only if it receive packets.
If rx_burst_counts=1000 and tx_burst_count=1000 during certain 
period of time, one can assume CPU usage is 100%.
If rx_burst_counts=1000 and tx_burst_count=100 during certain
period of time, one can assume CPU usage is 10%.
Here we assumes that tx_burst_count equals counts which rx_burst function
really receives incoming packets. 
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Thank you,
Hideyuki Yamashita
NTT TechnoCross