From: Stephen Hemminger <stephen@networkplumber.org>
To: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: Alex Rosenbaum <rosenbaumalex@gmail.com>,
"Wiles, Keith" <keith.wiles@intel.com>,
"Dumitrescu, Cristian" <cristian.dumitrescu@intel.com>,
Jay Rolette <rolette@infinite.io>,
Thomas Monjalon <thomas@monjalon.net>, DPDK <dev@dpdk.org>
Subject: Re: [dpdk-dev] [RFC] Kernel Control Path (KCP)
Date: Fri, 16 Jun 2017 09:48:33 -0700 [thread overview]
Message-ID: <20170616094833.701cfb28@xeon-e3> (raw)
In-Reply-To: <7879b121-fca9-995a-0087-12c840fbc47e@intel.com>
On Fri, 16 Jun 2017 16:27:47 +0100
Ferruh Yigit <ferruh.yigit@intel.com> wrote:
> Hi Alex,
>
> On 6/15/2017 1:07 PM, Alex Rosenbaum wrote:
> > please excuse me if I missed out of the previous conversation and
> > asking these questions again...
> >
> > Why create a new driver instead of improving the existing KNI driver?
>
> For control path, KNI uses Linux kernel driver within KNI kernel module.
> This method works, but may not be best option, and technically not
> extendable for some drivers. KNI control path currently supports only
> two drivers, proposed KCP works for all PMDs by default.
>
> Overall, KCP is outcome of the effort of improving KNI control path.
>
> Initial proposal was (a year ago I guess) introducing two new modules,
> one for control path and one for data path, and replace KNI completely.
> But current target is have KCP to have better control path support.
>
> Also, KNI handles both data and control path. But both are different
> functionalities and not need to be in some module. For example an
> application may not need exception data path to kernel, but may be
> interested in controlling DPDK interfaces via common Linux tools.
>
> > Can you share a table of the differences between the two driver /
> > approaches [KNI vs KCP]?
>
> KCP differences against KNI:
>
> - KCP is only for control path
> - Linux virtual interfaces created automatically, without DPDK
> application modification.
> - To create/destroy interfaces KCP uses rtnl, KNI uses ioctl. So
> technically it is possible to use "ip" tool to create / destroy
> interfaces supported by KCP.
> - KCP kernel module and userspace counterpart communicates via netlink,
> KNI uses ioctl.
> - KCP works for all PMDs without update on PMDs.
>
> >
> > Why do you want to remove features like data path that is provided by KNI today?
>
> There is not intention to remove exception data path, the focus is to
> improve KNI.
>
> >
> > thanks,
> > Alex
> >
>
Hopefully KCP can be submitted for upstream kernel, and therefore be supportable over
the long term. KNI in its current form is not acceptable upstream for a number
of reasons: style, use of ioctl, races with control operations, etc.
next prev parent reply other threads:[~2017-06-16 16:48 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-26 16:52 Ferruh Yigit
2017-05-28 16:55 ` Wiles, Keith
2017-05-29 9:26 ` Bruce Richardson
2017-05-29 17:29 ` Wiles, Keith
2017-06-16 15:54 ` Ferruh Yigit
2017-06-20 12:33 ` Ferruh Yigit
2017-05-30 10:55 ` Thomas Monjalon
2017-06-13 17:21 ` Ferruh Yigit
2017-06-13 18:00 ` Jay Rolette
2017-06-13 18:04 ` Dumitrescu, Cristian
2017-06-13 18:18 ` Wiles, Keith
2017-06-15 12:07 ` Alex Rosenbaum
2017-06-16 15:27 ` Ferruh Yigit
2017-06-16 16:48 ` Stephen Hemminger [this message]
2017-06-13 18:17 ` Wiles, Keith
2017-06-21 11:06 ` [dpdk-dev] [PATCH v8 0/4] Userspace Network Control Interface (UNCI) Ferruh Yigit
2017-06-21 11:06 ` [dpdk-dev] [PATCH v8 1/4] ethtool: move from sample folder to lib folder Ferruh Yigit
2017-06-26 11:02 ` Bruce Richardson
2017-06-21 11:06 ` [dpdk-dev] [PATCH v8 2/4] unci: add kernel control path kernel module Ferruh Yigit
2017-06-21 15:23 ` Stephen Hemminger
2017-06-30 17:02 ` Ferruh Yigit
2017-06-21 11:06 ` [dpdk-dev] [PATCH v8 3/4] rte_ctrl_if: add control interface library Ferruh Yigit
2017-06-26 11:09 ` Bruce Richardson
2017-06-26 11:30 ` Bruce Richardson
2017-06-21 11:06 ` [dpdk-dev] [PATCH v8 4/4] ethdev: add control interface support Ferruh Yigit
2017-06-21 15:24 ` Stephen Hemminger
2017-06-30 17:06 ` Ferruh Yigit
2017-06-26 11:39 ` [dpdk-dev] [PATCH v8 0/4] Userspace Network Control Interface (UNCI) Bruce Richardson
2017-06-29 16:13 ` Ferruh Yigit
2017-06-30 16:56 ` Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 00/20] " Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 01/20] ethtool: add library skeleton Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 02/20] ethtool: move from sample folder into lib folder Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 03/20] ethtool: remove PMD specific API call Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 04/20] ethtool: update header doxygen syntax Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 05/20] ethtool: enable library Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 06/20] doc: add ethtool library documentation Ferruh Yigit
2017-07-02 20:18 ` Mcnamara, John
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 07/20] doc: update ethtool sample app doc Ferruh Yigit
2017-07-02 20:17 ` Mcnamara, John
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 08/20] unci: add module skeleton Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 09/20] unci: add rtnl newlink Ferruh Yigit
2017-06-30 17:27 ` Stephen Hemminger
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 10/20] unci: init netlink Ferruh Yigit
2017-06-30 17:28 ` Stephen Hemminger
2017-06-30 17:29 ` Stephen Hemminger
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 11/20] unci: add netlink exec Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 12/20] unci: add netdevice ops Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 13/20] unci: add ethtool support Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 14/20] ctrl_if: add library skeleton Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 15/20] ctrl_if: add create destroy interface APIs Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 16/20] ctrl_if: initialize netlink interface Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 17/20] ctrl_if: process control messages Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 18/20] ctrl_if: process ethtool messages Ferruh Yigit
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 19/20] doc: add control interface library documentation Ferruh Yigit
2017-07-02 20:16 ` Mcnamara, John
2017-06-30 16:51 ` [dpdk-dev] [PATCH v9 20/20] ethdev: add control interface support Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 00/20] Userspace Network Control Interface (UNCI) Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 01/20] ethtool: add library skeleton Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 02/20] ethtool: move from sample folder into lib folder Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 03/20] ethtool: remove PMD specific API call Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 04/20] ethtool: update header doxygen syntax Ferruh Yigit
2017-07-06 9:18 ` Burakov, Anatoly
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 05/20] ethtool: enable library Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 06/20] doc: add ethtool library documentation Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 07/20] doc: update ethtool sample app doc Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 08/20] unci: add module skeleton Ferruh Yigit
2017-07-06 9:25 ` Burakov, Anatoly
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 09/20] unci: add rtnl newlink Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 10/20] unci: init netlink Ferruh Yigit
2017-07-06 9:32 ` Burakov, Anatoly
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 11/20] unci: add netlink exec Ferruh Yigit
2017-07-05 19:07 ` Stephen Hemminger
2017-07-06 10:45 ` Ferruh Yigit
2017-07-07 0:25 ` Stephen Hemminger
2017-07-05 19:15 ` Stephen Hemminger
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 12/20] unci: add netdevice ops Ferruh Yigit
2017-07-05 19:12 ` Stephen Hemminger
2017-07-05 19:12 ` Stephen Hemminger
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 13/20] unci: add ethtool support Ferruh Yigit
2017-07-05 19:07 ` Stephen Hemminger
2017-07-05 19:08 ` Stephen Hemminger
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 14/20] ctrl_if: add library skeleton Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 15/20] ctrl_if: add create destroy interface APIs Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 16/20] ctrl_if: initialize generic netlink interface Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 17/20] ctrl_if: process control messages Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 18/20] ctrl_if: process ethtool messages Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 19/20] doc: add control interface library documentation Ferruh Yigit
2017-07-04 16:13 ` [dpdk-dev] [PATCH v10 20/20] ethdev: add control interface support Ferruh Yigit
2017-07-08 6:28 ` Yuanhan Liu
2017-07-20 14:55 ` Ferruh Yigit
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