[dpdk-users] DPDK e1000 Legacy Transmit Descriptor Format

[Zhao1, Wei]

Hi, Kilian Holzinger
 

> -----Original Message-----
> From: Kilian Holzinger <kilian.holzinger at gmail.com>
> Sent: Wednesday, June 3, 2020 11:21 PM
> To: users at dpdk.org
> Cc: Zhao1, Wei <wei.zhao1 at intel.com>; Guo, Jia <jia.guo at intel.com>
> Subject: DPDK e1000 Legacy Transmit Descriptor Format
> 
> Hello,
> 
> today I was trying to find a way to use the Intel LaunchTime feature of the i210
> NIC in conjunction with DPDK IGB PMD driver. I thought it might be easy to get
> it to work, since it might be just some register that is missing. However I
> discovered that the e1000 driver uses the legacy transmit descriptor format
> and therefore the Launch Time feature is not easily available at all in DPDK.

You are righ, it seems igb driver do not get "DMA Time Stamp" at all, although it has use adv descriptor.
 
> Do you see any other options I have to use this feature in DPDK?

No

> Are there plans to move to the new Transmit Descriptor Format?

No plan, You had better enable this field yourself, no need to switch Transmit Descriptor Format, because e1000 it has use adv tx descriptor.

> 
> Best regards
> Kilian Holzinger