Does DPDK provide RX timestamps?

Does DPDK provide RX timestamps?

[Dpdk Newbie]

Hi. I am using Intel (i210) and AWS ENA network interface cards.

I would like to measure the following RX latencies:

1) NIC to DPDK packet ring buffer
2) DPDK packet ring buffer to application via rte_eth_rx_burst.

I don't mind measuring in nanoseconds or CPU cycles.

Unfortunately I cannot find any mention of hardware timestamps.

I found brief references to mbuf containing a timestamp in the dynamic
fields, but nothing definitive.

Could someone please clarify what the situation is?

Thanks,

Re: Does DPDK provide RX timestamps?

[Dmitry Kozlyuk]

2024-09-08 23:34 (UTC+0100), Dpdk Newbie:
> Hi. I am using Intel (i210) and AWS ENA network interface cards.
> 
> I would like to measure the following RX latencies:
> 
> 1) NIC to DPDK packet ring buffer
> 2) DPDK packet ring buffer to application via rte_eth_rx_burst.
> 
> I don't mind measuring in nanoseconds or CPU cycles.
> 
> Unfortunately I cannot find any mention of hardware timestamps.
> 
> I found brief references to mbuf containing a timestamp in the dynamic
> fields, but nothing definitive.
> 
> Could someone please clarify what the situation is?
> 
> Thanks,

DPDK only provides API to access Rx timestamp if it's available.
Example: https://elixir.bootlin.com/dpdk/v24.07/source/app/test-pmd/util.c#L37

Rx timestamp availability depends on the PMD and HW.
Support matrix: https://doc.dpdk.org/guides/nics/overview.html
It seems to be no support for i210 (igb?) or AWS ENA (ena).

	

Re: Does DPDK provide RX timestamps?

[Dpdk Newbie]

Thank you for the clarification regarding hardware/NIC timestamp on
i210 and ENA.

Does DPDK take a timestamp to facilitate my second measurement, from
the packet ring buffer to my application?

On Mon, 9 Sept 2024 at 00:07, Dmitry Kozlyuk <dmitry.kozliuk@gmail.com> wrote:
>
> 2024-09-08 23:34 (UTC+0100), Dpdk Newbie:
> > Hi. I am using Intel (i210) and AWS ENA network interface cards.
> >
> > I would like to measure the following RX latencies:
> >
> > 1) NIC to DPDK packet ring buffer
> > 2) DPDK packet ring buffer to application via rte_eth_rx_burst.
> >
> > I don't mind measuring in nanoseconds or CPU cycles.
> >
> > Unfortunately I cannot find any mention of hardware timestamps.
> >
> > I found brief references to mbuf containing a timestamp in the dynamic
> > fields, but nothing definitive.
> >
> > Could someone please clarify what the situation is?
> >
> > Thanks,
>
> DPDK only provides API to access Rx timestamp if it's available.
> Example: https://elixir.bootlin.com/dpdk/v24.07/source/app/test-pmd/util.c#L37
>
> Rx timestamp availability depends on the PMD and HW.
> Support matrix: https://doc.dpdk.org/guides/nics/overview.html
> It seems to be no support for i210 (igb?) or AWS ENA (ena).
>
>