From: Deepak Sehrawat <d.sehrawat@gmail.com>
To: "Zhang, Helin" <helin.zhang@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] Fast Path Query
Date: Wed, 14 Jan 2015 13:28:17 +0530 [thread overview]
Message-ID: <CAH+GhR=4pCBN7xZRRZiXNz96JrDY5+iBr9_s-pwVBopXGBi-bw@mail.gmail.com> (raw)
In-Reply-To: <F35DEAC7BCE34641BA9FAC6BCA4A12E70A7E85E7@SHSMSX104.ccr.corp.intel.com>
Hi Helin,
If we use exception_path or KNI, which extracts packet from Linux kernel
(for DPDK application processing), will it still remain fast path? Will it
not impact the performance; as Linux interrupt framework shall also come
into picture here?
On Wed, Jan 14, 2015 at 1:17 PM, Zhang, Helin <helin.zhang@intel.com> wrote:
> Hi Deepak
>
> If a NIC port is controlled by DPDK, all packets received by that port
> will go directly to DPDK, and Linux kernel doesn't know those packets
> anymore.
> But, the packets received by DPDK can be put into kernel by two special
> ways. They are exception_path and KNI. Please check the examples/ for more
> details.
> In the future, a port may be co-controlled by both Linux and DPDK. Part of
> queues will be controlled by Linux kernel driver, part of queues will be
> controlled by DPDK. Check the DPDK roadmap for more details.
>
> Regards,
> Helin
>
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Deepak Sehrawat
> > Sent: Wednesday, January 14, 2015 2:16 PM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] Fast Path Query
> >
> > Hi All,
> >
> > I have a use-case where my slow path application (control path) is to
> run on
> > Linux where as my data path is to run as DPDK application. Because both
> > control and data packets are going to be received via same NIC card, how
> will
> > these two flows be separated and passed on to Linux control app and DPDK
> > data path app respectively? In short I want to understand how NIC
> received
> > packets are separated between Linux Eth driver and PMD (poll mode
> > driver) of DPDK?
> >
> > Thanks for the help in advance.
> >
> > Thanks,
> > Deepak
>
--
======================================
The Harder I work,
The Luckier I Get
----------------------------------------------------------------------------
DEEPAK $EHRAWAT
Senior Principal Engineer
Hughes Systique Corporation,
D-8, InfoCity Phase- II,
Sector-33, Gurgaon-122001
Mobile No. 9818228349
deepak.sehrawat@hsc.com
======================================
next prev parent reply other threads:[~2015-01-14 7:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-14 6:16 Deepak Sehrawat
2015-01-14 6:24 ` Gal Sagie
2015-01-14 7:47 ` Zhang, Helin
2015-01-14 7:58 ` Deepak Sehrawat [this message]
2015-01-14 8:02 ` Zhang, Helin
[not found] ` <CAH+GhRmonvEv=JsRY8T4ykYDkfFfvHat=HX_nDyRg=sz1dQ6rg@mail.gmail.com>
[not found] ` <F35DEAC7BCE34641BA9FAC6BCA4A12E70A7E8648@SHSMSX104.ccr.corp.intel.com>
[not found] ` <CAH+GhRm-yvJw6iZvoxXChKPYyuWJDsFZLtPTk4DENHPYc+bAXg@mail.gmail.com>
2015-01-15 6:46 ` Zhang, Helin
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