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Re: [PATCH] ath5k: RX timestamp is reported at end of frame

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Hi,

It may be; that's the problem. :/



Adrian

On 12 November 2012 10:53, Thomas Pedersen <thomas@xxxxxxxxxxx> wrote:
> This is true for at least AR5213, and shouldn't be different for other
> ath5k PHYs.
>
> Signed-off-by: Thomas Pedersen <thomas@xxxxxxxxxxx>
> ---
>  drivers/net/wireless/ath/ath5k/base.c |   13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
> index 9f31cfa..ae1a2fe 100644
> --- a/drivers/net/wireless/ath/ath5k/base.c
> +++ b/drivers/net/wireless/ath/ath5k/base.c
> @@ -1335,20 +1335,9 @@ ath5k_receive_frame(struct ath5k_hw *ah, struct sk_buff *skb,
>          * 15bit only. that means TSF extension has to be done within
>          * 32768usec (about 32ms). it might be necessary to move this to
>          * the interrupt handler, like it is done in madwifi.
> -        *
> -        * Unfortunately we don't know when the hardware takes the rx
> -        * timestamp (beginning of phy frame, data frame, end of rx?).
> -        * The only thing we know is that it is hardware specific...
> -        * On AR5213 it seems the rx timestamp is at the end of the
> -        * frame, but I'm not sure.
> -        *
> -        * NOTE: mac80211 defines mactime at the beginning of the first
> -        * data symbol. Since we don't have any time references it's
> -        * impossible to comply to that. This affects IBSS merge only
> -        * right now, so it's not too bad...
>          */
>         rxs->mactime = ath5k_extend_tsf(ah, rs->rs_tstamp);
> -       rxs->flag |= RX_FLAG_MACTIME_MPDU;
> +       rxs->flag |= RX_FLAG_MACTIME_END;
>
>         rxs->freq = ah->curchan->center_freq;
>         rxs->band = ah->curchan->band;
> --
> 1.7.10.4
>
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