[dpdk-dev] Accurate timestamps in received packets

[Mcnamara, John]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Montorsi, Francesco
> Sent: Monday, October 12, 2015 9:26 AM
> To: Lu, Wenzhuo; dev at dpdk.org
> Subject: Re: [dpdk-dev] Accurate timestamps in received packets
> 
> Hi Wenzhuo,
> 
> > -----Original Message-----
> > From: Lu, Wenzhuo [mailto:wenzhuo.lu at intel.com]
> >
> > Why not
> > searching ieee1588 in the dpdk git repository?  Surely you'll find
> > something.
>
> I tried using IEEE 1588 without success. In particular I enabled it at
> build-time of DPDK and then after calling rte_eth_rx_burst() I tried
> calling rte_eth_timesync_read_tx_timestamp() to get a timestamp from the
> port_id used to receive a burst of packets, but the function always
> returns with an error.
> Moreover, even if the function succeeded I need a timestamp for every
> incoming packet, not a single timestamp for the whole burst of received
> packets... do you know how I could achieve that?

Hi,

IEEE1588 isn't suitable for this. It is a timesync protocol rather than a timestamping function.

AFAIK, timestamping of every packet isn't supported by ixgbe/i40e nics and I don't know about non-Intel nics. It was supported for some(?) igb nics and hence the patch you linked to. Also, there isn't any DPDK API to enable/disable it even if it is supported by the nic.

John