[POC v2] net/iavf: support no data path polling mode

[Stephen Hemminger]

On Thu, 20 Jul 2023 10:08:14 +0000
Mingjin Ye <mingjinx.ye at intel.com> wrote:

> Introduces a devargs "no-poll-on-link-down" in iavf PMD. When this
> flag is set, the PMD switches to no-poll mode when the link state is
> down (rx/tx burst returns to 0 immediately). When the link state
> returns to normal, PMD switches to normal rx/tx burst state.
> 
> Signed-off-by: Mingjin Ye <mingjinx.ye at intel.com>

There is not enough explanation of this.
Why is this necessary?
Why is it unique to the iavf device and not true of other devices?
Where is the documentation?