[dpdk-users] DPDK e1000 Legacy Transmit Descriptor Format

[dpdk-users] DPDK e1000 Legacy Transmit Descriptor Format

[Kilian Holzinger]

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.
Do you see any other options I have to use this feature in DPDK?
Are there plans to move to the new Transmit Descriptor Format?

Best regards
Kilian Holzinger

Re: [dpdk-users] DPDK e1000 Legacy Transmit Descriptor Format

[Zhao1, Wei]

Hi, Kilian Holzinger
 

> -----Original Message-----
> From: Kilian Holzinger <kilian.holzinger@gmail.com>
> Sent: Wednesday, June 3, 2020 11:21 PM
> To: users@dpdk.org
> Cc: Zhao1, Wei <wei.zhao1@intel.com>; Guo, Jia <jia.guo@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

Re: [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@gmail.com>; users@dpdk.org
> Cc: Guo, Jia <jia.guo@intel.com>
> Subject: RE: DPDK e1000 Legacy Transmit Descriptor Format
> 
> Hi, Kilian Holzinger
> 
> 
> > -----Original Message-----
> > From: Kilian Holzinger <kilian.holzinger@gmail.com>
> > Sent: Wednesday, June 3, 2020 11:21 PM
> > To: users@dpdk.org
> > Cc: Zhao1, Wei <wei.zhao1@intel.com>; Guo, Jia <jia.guo@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