One pkt in mbuf chain - virtio pmd driver

One pkt in mbuf chain - virtio pmd driver

[Czaus, Tomasz]

Hello,

Does virtio pmd driver support scenario when a frame fits in mbuf chain, this means all headers (eth/ipv4/tcp) are located in first mbuf and user data is located in next mbuf. I have asked the same question on dpdk-ovs mailing group, here is a thread and more details:

https://lists.01.org/pipermail/dpdk-ovs/2014-August/001557.html

Best Regards,
Tomasz Czaus

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Re: One pkt in mbuf chain - virtio pmd driver

[Xie, Huawei]

Hi Tomasz:
This is a known issue in user space vhost. Will be fixed in subsequent patch once the vhost lib is applied.

BR.
-Huawei
> -----Original Message-----
> From: dev [mailto:dev-bounces-VfR2kkLFssw@public.gmane.org] On Behalf Of Czaus, Tomasz
> Sent: Thursday, August 07, 2014 2:20 PM
> To: dev-VfR2kkLFssw@public.gmane.org
> Subject: [dpdk-dev] One pkt in mbuf chain - virtio pmd driver
> 
> Hello,
> 
> Does virtio pmd driver support scenario when a frame fits in mbuf chain, this
> means all headers (eth/ipv4/tcp) are located in first mbuf and user data is
> located in next mbuf. I have asked the same question on dpdk-ovs mailing group,
> here is a thread and more details:
> 
> https://lists.01.org/pipermail/dpdk-ovs/2014-August/001557.html
> 
> Best Regards,
> Tomasz Czaus
> 
> --------------------------------------------------------------------
> 
> Intel Technology Poland sp. z o.o.
> ul. Slowackiego 173 | 80-298 Gdansk | Sad Rejonowy Gdansk Polnoc | VII
> Wydzial Gospodarczy Krajowego Rejestru Sadowego - KRS 101882 | NIP 957-07-
> 52-316 | Kapital zakladowy 200.000 PLN.
> 
> Ta wiadomosc wraz z zalacznikami jest przeznaczona dla okreslonego adresata i
> moze zawierac informacje poufne. W razie przypadkowego otrzymania tej
> wiadomosci, prosimy o powiadomienie nadawcy oraz trwale jej usuniecie;
> jakiekolwiek
> przegladanie lub rozpowszechnianie jest zabronione.
> This e-mail and any attachments may contain confidential material for the sole
> use of the intended recipient(s). If you are not the intended recipient, please
> contact the sender and delete all copies; any review or distribution by
> others is strictly prohibited.

Re: One pkt in mbuf chain - virtio pmd driver

[Ouyang, Changchun]

It is one feature in developing,
scatter and mergeable RX will be support in virtio subsequent patch.
Thanks 
Changchun


> -----Original Message-----
> From: dev [mailto:dev-bounces-VfR2kkLFssw@public.gmane.org] On Behalf Of Xie, Huawei
> Sent: Thursday, August 7, 2014 3:07 PM
> To: Czaus, Tomasz; dev-VfR2kkLFssw@public.gmane.org
> Subject: Re: [dpdk-dev] One pkt in mbuf chain - virtio pmd driver
> 
> Hi Tomasz:
> This is a known issue in user space vhost. Will be fixed in subsequent patch
> once the vhost lib is applied.
> 
> BR.
> -Huawei
> > -----Original Message-----
> > From: dev [mailto:dev-bounces-VfR2kkLFssw@public.gmane.org] On Behalf Of Czaus, Tomasz
> > Sent: Thursday, August 07, 2014 2:20 PM
> > To: dev-VfR2kkLFssw@public.gmane.org
> > Subject: [dpdk-dev] One pkt in mbuf chain - virtio pmd driver
> >
> > Hello,
> >
> > Does virtio pmd driver support scenario when a frame fits in mbuf
> > chain, this means all headers (eth/ipv4/tcp) are located in first mbuf
> > and user data is located in next mbuf. I have asked the same question
> > on dpdk-ovs mailing group, here is a thread and more details:
> >
> > https://lists.01.org/pipermail/dpdk-ovs/2014-August/001557.html
> >
> > Best Regards,
> > Tomasz Czaus
> >
> > --------------------------------------------------------------------
> >
> > Intel Technology Poland sp. z o.o.
> > ul. Slowackiego 173 | 80-298 Gdansk | Sad Rejonowy Gdansk Polnoc | VII
> > Wydzial Gospodarczy Krajowego Rejestru Sadowego - KRS 101882 | NIP
> > 957-07-
> > 52-316 | Kapital zakladowy 200.000 PLN.
> >
> > Ta wiadomosc wraz z zalacznikami jest przeznaczona dla okreslonego
> > adresata i moze zawierac informacje poufne. W razie przypadkowego
> > otrzymania tej wiadomosci, prosimy o powiadomienie nadawcy oraz trwale
> > jej usuniecie; jakiekolwiek przegladanie lub rozpowszechnianie jest
> > zabronione.
> > This e-mail and any attachments may contain confidential material for
> > the sole use of the intended recipient(s). If you are not the intended
> > recipient, please contact the sender and delete all copies; any review
> > or distribution by others is strictly prohibited.

Re: One pkt in mbuf chain - virtio pmd driver

[Czaus, Tomasz]

Hi,

First of all thank you for quick answer! Do we know when exactly this feature will be available?

Best Regards,
Tomasz Czaus

-----Original Message-----
From: Xie, Huawei 
Sent: Thursday, August 07, 2014 9:07 AM
To: Czaus, Tomasz; dev-VfR2kkLFssw@public.gmane.org
Cc: Long, Thomas
Subject: RE: [dpdk-dev] One pkt in mbuf chain - virtio pmd driver

Hi Tomasz:
This is a known issue in user space vhost. Will be fixed in subsequent patch once the vhost lib is applied.

BR.
-Huawei
> -----Original Message-----
> From: dev [mailto:dev-bounces-VfR2kkLFssw@public.gmane.org] On Behalf Of Czaus, Tomasz
> Sent: Thursday, August 07, 2014 2:20 PM
> To: dev-VfR2kkLFssw@public.gmane.org
> Subject: [dpdk-dev] One pkt in mbuf chain - virtio pmd driver
> 
> Hello,
> 
> Does virtio pmd driver support scenario when a frame fits in mbuf 
> chain, this means all headers (eth/ipv4/tcp) are located in first mbuf 
> and user data is located in next mbuf. I have asked the same question 
> on dpdk-ovs mailing group, here is a thread and more details:
> 
> https://lists.01.org/pipermail/dpdk-ovs/2014-August/001557.html
> 
> Best Regards,
> Tomasz Czaus
> 
> --------------------------------------------------------------------
> 
> Intel Technology Poland sp. z o.o.
> ul. Slowackiego 173 | 80-298 Gdansk | Sad Rejonowy Gdansk Polnoc | VII 
> Wydzial Gospodarczy Krajowego Rejestru Sadowego - KRS 101882 | NIP 
> 957-07-
> 52-316 | Kapital zakladowy 200.000 PLN.
> 
> Ta wiadomosc wraz z zalacznikami jest przeznaczona dla okreslonego 
> adresata i moze zawierac informacje poufne. W razie przypadkowego 
> otrzymania tej wiadomosci, prosimy o powiadomienie nadawcy oraz trwale 
> jej usuniecie; jakiekolwiek przegladanie lub rozpowszechnianie jest 
> zabronione.
> This e-mail and any attachments may contain confidential material for 
> the sole use of the intended recipient(s). If you are not the intended 
> recipient, please contact the sender and delete all copies; any review 
> or distribution by others is strictly prohibited.
--------------------------------------------------------------------

Intel Technology Poland sp. z o.o.
ul. Slowackiego 173 | 80-298 Gdansk | Sad Rejonowy Gdansk Polnoc | VII Wydzial Gospodarczy Krajowego Rejestru Sadowego - KRS 101882 | NIP 957-07-52-316 | Kapital zakladowy 200.000 PLN.

Ta wiadomosc wraz z zalacznikami jest przeznaczona dla okreslonego adresata i moze zawierac informacje poufne. W razie przypadkowego otrzymania tej wiadomosci, prosimy o powiadomienie nadawcy oraz trwale jej usuniecie; jakiekolwiek
przegladanie lub rozpowszechnianie jest zabronione.
This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). If you are not the intended recipient, please contact the sender and delete all copies; any review or distribution by
others is strictly prohibited.

Re: One pkt in mbuf chain - virtio pmd driver

[Stephen Hemminger]

On Thu, 7 Aug 2014 06:19:58 +0000
"Czaus, Tomasz" <tomasz.czaus-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> wrote:

> Hello,
> 
> Does virtio pmd driver support scenario when a frame fits in mbuf chain, this means all headers (eth/ipv4/tcp) are located in first mbuf and user data is located in next mbuf. I have asked the same question on dpdk-ovs mailing group, here is a thread and more details:
> 
> https://lists.01.org/pipermail/dpdk-ovs/2014-August/001557.html
> 
> Best Regards,
> Tomasz Czaus

Existing DPDK 1.7 virtio driver does not.
I wrote a virtio DPDK driver (before the 1.6 one) that does handle it, so it is possible.

I have some patches to handle multi-part mbuf and messages, based on backport
from that driver but they are untested.