"Ronciak, John" <[email protected]> wrote:
> The enabling and/or disabling takes place during configuration which
> is based on the actual HW the driver is loading on. So I think the
> current code is correct. The HW just won't timestamp at all if it
> can't or can't be put into that mode. Did you read the datasheet on
> how the actual HW works regarding timestamping? While "all" can be
I had a look at section 7.10 and 8.17 of OpenSDM_82576-DS-2p0.pdf, but I
might have overlooked something.
> set for the 82576 HW it can't really do it as there need to be a
> register read per packet which can't happen in the time when another
Does kernel igb driver support one of those hardwares? Jesse said
82575/576 does not support HWTSTAMP_FILTER_ALL, and AFAICS igb module
handles those models, only.
> frame arrives. This will result in all packets arriving being
> timestamped with the same timestamp until the register is read. So
> all are being timestamped, just not the way you would expect. That is
> why it is clearly called out in the HW datasheet that timestamping is
> only recommended for PTP packets on the 82576 HW. Other Intel
> Ethernet HW can timestamp all packets.
But I tried reading E1000_RXSTMP[LH] registers as soon as
E1000_RXD_STAT_TS is set with no luck; ie. the timestamp was activated
only for ptp packets (even tried reading those registers regardless of
.._STAT_TS without success). So as you said, that probably means
HWTSTAMP_FILTER_ALL is not working on my HW. Is there a way to find out
if HWTSTAMP_FILTER_ALL is supported by the HW so that the igb driver
return -ERANGE from the ioctl()?
Ali
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