On Fri, 2008-02-15 at 16:01 +0900, Bruno Randolf wrote:
> define mactime as the time when the first data symbol arrived at the HW. the
> old definition was questionable because 802.11 defines timestamp only for
> beacon and probe response frames, and there it means the timestamp field.
>
> a stricter definition of mactime is necessary for correct merging of IBSS.
>
> note that it is up to the driver to convert whatever its hardware returns to
> this definition. unfortunately we don't know for example when atheros hardware
> takes its rx timestamp exactly :(
>
> Signed-off-by: Bruno Randolf <bruno@xxxxxxxxxxxxx>
Acked-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
> ---
>
> include/net/mac80211.h | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
>
> diff --git a/include/net/mac80211.h b/include/net/mac80211.h
> index 460da54..1b807f4 100644
> --- a/include/net/mac80211.h
> +++ b/include/net/mac80211.h
> @@ -295,7 +295,8 @@ enum mac80211_rx_flags {
> * The low-level driver should provide this information (the subset
> * supported by hardware) to the 802.11 code with each received
> * frame.
> - * @mactime: MAC timestamp as defined by 802.11
> + * @mactime: value in microseconds of the 64-bit Time Synchronization Function
> + * (TSF) timer when the first data symbol (MPDU) arrived at the hardware.
> * @band: the active band when this frame was received
> * @freq: frequency the radio was tuned to when receiving this frame, in MHz
> * @ssi: signal strength when receiving this frame
>
>
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