Re: [PATCH v7] ethdev: add template table resize API

[Thomas Monjalon <thomas@monjalon.net>]

14/02/2024 15:32, Gregory Etelson:
> +The resizable template table API enables applications to dynamically adjust
> +capacity of template tables without disrupting the existing flow rules
> +operation. The resizable template table API allows applications to optimize the
> +memory usage and performance of template tables according to the traffic
> +conditions and requirements.
> +
> +A typical use case for the resizable template table API:
> +
> +  #. Create a resizable table with the initial capacity.
> +  #. Change the table flow rules capacity.
> +  #. Update table flow objects.
> +  #. Complete the table resize.
> +
> +A resizable table can be either in normal or resizable state.
> +When application begins to resize the table, its state is changed to resizable.
> +The table stays in resizable state until the application finishes resize
> +procedure.
> +The application can resize a table in the normal state only.
> +
> +The application needs to set the ``RTE_FLOW_TABLE_SPECIALIZE_RESIZABLE`` bit in
> +the table attributes when creating a template table that can be resized,
> +and the bit cannot be set or cleared later.
> +
> +The application triggers the table resize by calling
> +the ``rte_flow_template_table_resize()`` function. The resize process updates
> +the table configuration to fit the new flow rules capacity.
> +Table resize does not change existing flow objects configuration.
> +The application can create new flow rules and modify or delete existing flow
> +rules while the table is resizing, but the table performance might be
> +slower than usual.
> +
> +Flow rules that existed before table resize are fully functional after
> +table resize. However, the application must update flow objects to match
> +the new table configuration.
> +The application calls ``rte_flow_async_update_resized()`` to update flow object
> +for the new table configuration.
> +All table flow rules must be updated.
> +
> +The application calls ``rte_flow_template_table_resize_complete()`` to return a
> +table to normal state after it completed flow objects update.

[...]
> + * Update flow for the new template table configuration after table resize.
> + * Must be called for each *rule* created before and after *table* resize.
> + * Must be called before rte_flow_template_table_resize_complete().

That's a clear explanation.

Acked-by: Thomas Monjalon <thomas@monjalon.net>