Support of TX timestamps in kernel / by hardware

Support of TX timestamps in kernel / by hardware

[Stefan Bruens]

Hi,

I have looked through the individual hardware drivers, but there seems to be 
no way of getting an accurate time when an individual packet preamble hits the 
antenna.

For RX, most drivers support a RX timestamp based on the TSF and put this into  
struct ieee80211_rx_status -> mactime. For TX, I found nothing related.

Kind regards,

Stefan

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Re: Support of TX timestamps in kernel / by hardware

[Ben Greear]

On 05/17/2015 09:08 AM, Stefan Bruens wrote:
> Hi,
>
> I have looked through the individual hardware drivers, but there seems to be
> no way of getting an accurate time when an individual packet preamble hits the
> antenna.
>
> For RX, most drivers support a RX timestamp based on the TSF and put this into
> struct ieee80211_rx_status -> mactime. For TX, I found nothing related.

I guess a timestamp made in the driver when tx-status is given by the
firmware/hardware might be at least a good estimate.


Thanks,
Ben

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Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com