[dpdk-users] DPDK e1000 Legacy Transmit Descriptor Format

[Zhao1, Wei]

Hi，Kilian Holzinger
> -----Original Message-----
> From: Zhao1, Wei
> Sent: Thursday, June 4, 2020 6:03 PM
> To: Kilian Holzinger <kilian.holzinger at gmail.com>; users at dpdk.org
> Cc: Guo, Jia <jia.guo at intel.com>
> Subject: RE: DPDK e1000 Legacy Transmit Descriptor Format
> 
> 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.


Sorry, what you need is " LaunchTime " , that is not support indeed.
 
> 
> > 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