On 18.03.16 10:50, Savolainen, Petri (Nokia - FI/Espoo) wrote:
Hi, Not yet, but going to do that soon. Do you need also an API for reading (sampling) the packet input HW timestamp from the interface? For example, rte_eth_timesync_read_rx_timestamp does that. I was going to add (first) only ability to the read timestamp stored in the received packet, timestamp frequency and a configuration option to enable/disable timestamping per interface (during pktio open). We have odp_time_ and odp_cpu_cycle APIs to read wall clock time and CPU cycle counters. More adcanced packet input clock (or IEEE 1588 clock) features could added later on.
Yep, but odp_time API covers different h/w counter then timestamps of incoming packets. Not sure if enabale/disable API is needed. The packet timestamps don't consume CPU time in normal circumstances and they are present or not. If h/w doesn't support timestamping then it can be emulated with odp_time_*, but it's rather an exception then rule. It should be warned that packet time stamp is not comparable with time API types. And one though, maybe it can be used with time API as a different time type....dislike it, as time API can consume more cycles after that, but it's possible.
-Petri *From:*EXT Dominic Pigott [mailto:d...@intelligentcompute.com] *Sent:* Thursday, March 17, 2016 4:39 PM *To:* Savolainen, Petri (Nokia - FI/Espoo) <petri.savolai...@nokia.com> *Cc:* lng-odp <lng-odp@lists.linaro.org> *Subject:* Re: Accesing hardware time stamps Hi Petri Thanks for the answer, did you have any time to look at this further? Most modern NICs can generate the timestamps in hardware so the overhead should be low, but its vendor specific. DPDK implements a standard API in 2.1 I believe: http://dpdk.org/doc/guides/rel_notes/release_2_1.html?highlight=timestamp Regards Dom ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ *From: *"Savolainen, Petri (Nokia - FI/Espoo)" <petri.savolai...@nokia.com <mailto:petri.savolai...@nokia.com>> *To: *"EXT Dominic Pigott" <d...@intelligentcompute.com <mailto:d...@intelligentcompute.com>>, "lng-odp" <lng-odp@lists.linaro.org <mailto:lng-odp@lists.linaro.org>> *Sent: *Friday, 11 March, 2016 05:13:52 *Subject: *RE: Accesing hardware time stamps Hi, There’s not yet packet time stamping, but I’m thinking to add a 64 bit time stamp into packet metadata and have a packet input configuration option to enable/disable timestamping, since it may take lots of CPU cycles to timestamp every packet (also when application would not need it). I’ll look into it more detail at next week. -Petri *From:*lng-odp [mailto:lng-odp-boun...@lists.linaro.org] *On Behalf Of *EXT Dominic Pigott *Sent:* Thursday, March 10, 2016 1:08 PM *To:* lng-odp@lists.linaro.org <mailto:lng-odp@lists.linaro.org> *Subject:* [lng-odp] Accesing hardware time stamps Hi, I cannot find in the documentation, but is it possible to access a packets hardware time stamp via the ODP API? Regards Dom _______________________________________________ lng-odp mailing list lng-odp@lists.linaro.org https://lists.linaro.org/mailman/listinfo/lng-odp
-- Regards, Ivan Khoronzhuk _______________________________________________ lng-odp mailing list lng-odp@lists.linaro.org https://lists.linaro.org/mailman/listinfo/lng-odp
