[PATCH] FT: Add FT over-the-DS selection for SME based drivers

Dennis Bland dennis at dbperformance.com
Sat Apr 13 08:24:47 PDT 2019

On Sat, Apr 06, 2019 at 12:24:21PM -0600, Jasraj Randhawa wrote:
> The purpose of the config parameter is to allow the user to give a
> preference for over-the-DS vs over-the-air. From a performance
> perspective, over-the-air should be the fastest and therefore the
> preferred choice. However, since support for over-the-air is mandatory
> when a device supports FT and over-the-DS is optional, over-the-air would
> always be selected even when over-the-DS is advertised by the AP.

Why would over-the-air be the preferred choice? Over-the-DS allows a
working association and same operating channel to be maintained during
the authentication step and interruption in data delivery is only for
the time it takes to change channels and exchange reassociation frames.

I don't see why the user would need to know about this type of detail.
Is there a specific need for being able to prefer an option that the
implementation would consider worse?

Some implementations (e.g. mobile IoT Wi-Fi) prefer FT over-the-DS for
the reasons you mentioned above, if the AP advertises support for it.
Is there another way for wpa_supplicant to autonomously select FT
over-the-DS, if supported by the AP?

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