[PATCH v10 2/2] ethdev: add quota flow action and item

[Thomas Monjalon]

02/02/2023 14:47, Gregory Etelson:
> Quota action limits traffic according to pre-defined configuration.
> Quota reflects overall traffic usage regardless bandwidth.
> Quota flow action initialized with signed tokens number value.
> Quota flow action updates tokens number according to
> these rules:
> 1. if quota was configured to count packet length, for each packet
>    of size S, tokens number reduced by S.
> 2. If quota was configured to count packets, each packet decrements
>    tokens number.
> quota action sets packet metadata according to a number of remaining
> tokens number:
>   PASS - remaining tokens number is non-negative.
>   BLOCK - remaining tokens number is negative.
> 
> Quota flow item matches on that data
> 
> Application updates tokens number in quota flow action
> with SET or ADD calls:
>  SET(QUOTA, val) - arm quota with new tokens number set to val
>  ADD(QUOTA, val) - increase existing quota tokens number by val
> 
> Both SET and ADD return to application number of tokens stored in port
> before update.
> 
> If quota state was BLOCK (negative action tokens number)
> application can change it to PASS after providing enough tokens to
> raise action tokens number to 0 or above.
> 
> Application must create a rule with quota action to mark flow and
> match on the mark with quota item in following flow rule.
> 
> Signed-off-by: Gregory Etelson <getelson at nvidia.com>
> Acked-by: Ori Kam <orika at nvidia.com>

I feel this kind of explanation would have been better in rte_flow.rst
instead of a "doxygen-like" documentation.

Greogory, Ori, feels lucky, you've just got promoted as the rewriters
of the whole rte_flow.rst :)