Re: [PATCH v3 1/3] cfg80211/nl80211: add support for scheduled scans

[Stanislaw Gruszka <sgruszka@redhat.com>]

On Wed, May 11, 2011 at 05:09:35PM +0300, Luciano Coelho wrote:
> Implement new functionality for scheduled scan offload.  With this feature we
> can scan automatically at certain intervals.
> 
> The idea is that the hardware can perform scan automatically and filter on
> desired results without waking up the host unnecessarily.

Can you elaborate more about this?

> Add NL80211_CMD_START_SCHED_SCAN and NL80211_CMD_STOP_SCHED_SCAN
> commands to the nl80211 interface.  When results are available they are
> reported by NL80211_CMD_SCHED_SCAN_RESULTS events.  The userspace is
> informed when the scheduled scan has stopped with a
> NL80211_CMD_SCHED_SCAN_STOPPED event, which can be triggered either by
> the driver or by a call to NL80211_CMD_STOP_SCHED_SCAN.
> 
> Signed-off-by: Luciano Coelho <coelho@ti.com>
> ---
>  include/linux/nl80211.h |   25 +++++
>  include/net/cfg80211.h  |   57 +++++++++++
>  net/wireless/core.c     |   12 ++-
>  net/wireless/core.h     |    7 ++
>  net/wireless/nl80211.c  |  250 +++++++++++++++++++++++++++++++++++++++++++++++
>  net/wireless/nl80211.h  |    4 +
>  net/wireless/scan.c     |   70 +++++++++++++
>  7 files changed, 424 insertions(+), 1 deletions(-)

And explain, why all of this is needed, instead of modify existing scan
code and reuse existing infrastructure. This sched_scan does not seems to
be something different than normal hardware scan we have already, or I'm
wrong.

Thanks
Stanislaw