From: Jerin Jacob <jerin.jacob@caviumnetworks.com>
To: "Eads, Gage" <gage.eads@intel.com>
Cc: "Rao, Nikhil" <nikhil.rao@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
"thomas@monjalon.net" <thomas@monjalon.net>,
"Richardson, Bruce" <bruce.richardson@intel.com>,
"Van Haaren, Harry" <harry.van.haaren@intel.com>,
"hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>,
"nipun.gupta@nxp.com" <nipun.gupta@nxp.com>,
"Vangati, Narender" <narender.vangati@intel.com>,
"Gujjar, Abhinandan S" <abhinandan.gujjar@intel.com>
Subject: Re: [dpdk-dev] [PATCH 1/2] eventdev: add event adapter for ethernet Rx queues
Date: Thu, 10 Aug 2017 22:23:21 +0530 [thread overview]
Message-ID: <20170810165319.GA6051@jerin> (raw)
In-Reply-To: <9184057F7FC11744A2107296B6B8EB1E01F0EEF4@FMSMSX108.amr.corp.intel.com>
-----Original Message-----
> Date: Wed, 9 Aug 2017 19:24:30 +0000
> From: "Eads, Gage" <gage.eads@intel.com>
> To: Jerin Jacob <jerin.jacob@caviumnetworks.com>
> CC: "Rao, Nikhil" <nikhil.rao@intel.com>, "dev@dpdk.org" <dev@dpdk.org>,
> "thomas@monjalon.net" <thomas@monjalon.net>, "Richardson, Bruce"
> <bruce.richardson@intel.com>, "Van Haaren, Harry"
> <harry.van.haaren@intel.com>, "hemant.agrawal@nxp.com"
> <hemant.agrawal@nxp.com>, "nipun.gupta@nxp.com" <nipun.gupta@nxp.com>,
> "Vangati, Narender" <narender.vangati@intel.com>, "Gujjar, Abhinandan S"
> <abhinandan.gujjar@intel.com>
> Subject: RE: [PATCH 1/2] eventdev: add event adapter for ethernet Rx queues
> > > > > >
> > > > >
> > > > > I don't think we can rely on there being another port available --
> > > > > a user may
> > > > have configured the sw eventdev with all 64 ports, for instance.
> > > >
> > > > On that case, irrespective any scheme(callback vs non callback) the
> > > > adapter creation would fail. Right?
> > > >
> > > > > What if the user is required to calculate cfg.nb_event_ports as a
> > > > > function of
> > > > the RX_ADAPTER_CAP_INBUILT_PORT capability (i.e. add a port if the
> > > > capability is not set), such that a reconfigure is not required?
> > > >
> > > > We have only one NON INBUILT eventdev port per adapter. Right? i.e
> > > > in the v1 spec it was rte_event_eth_rx_adapter_conf.event_port_id,
> > > > How about it can be rte_event_port_count() + 1 ? Since we are NOT
> > > > linking this port, the context call be kept in adapter itself. Right?
> > >
> > > It could be. Thinking on it some more, I'm a little concerned about doing
> > configuration without the application's knowledge. Possible issues that could
> > arise:
> > > - The user later reconfigures the event device with fewer ports and
> > > the adapter's port becomes invalid, or reconfigures it with more ports
> > > and begins using the port the adapter is using
> > > - rte_event_port_count() + 1 extends beyond the PMD's capabilities
> > > (the sw PMD is hard-coded to support a max of 64 ports, for example)
> > >
> > > Having the user be responsible for the port configuration could avoid these
> > problems. Since the user needs to check the <eventdev, ethdev> pair's
> > capabilities for the CAP_ADD_QUEUE anyway, they could also check for
> > INBUILT_PORT and decide whether or not to request an additional port at
> > eventdev configure time -- thereby ensuring they don't waste a port when using
> > hardware with inbuilt ports. And this keeps the configuration code in one place
> > (the app), rather than spread across the app, adapter, and potentially the
> > conf_cb.
> >
> > OK.Sounds reasonable.May be we can push the responsibility to application.We
> > could have a helper function using the proposed adapter API. That helper
> > function would create the adapter based on the capability for the _default_
> > case.
> > Applications free to use the raw adapter API to get more control if required.
> > Otherwise we will duplicate the code in all the applications.
> >
>
> Makes sense. Are you thinking the helper function would do stop + reconfig with additional port + start + setup port, or just setup the port with an ID the app supplies (only when a port is required, of course)? The second one could be done with little additional code -- the app just needs to check if an additional port is needed when configuring the eventdev, and another helper function could take a list of <eventdev, ethdev> pairs and return true if any don't have an inbuilt port.
I am in favor adding more logic in helper function(I believe, first one ) so that it will help
application reuse the helper functions for the normal case.
next prev parent reply other threads:[~2017-08-10 16:53 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-09 20:38 [dpdk-dev] [RFC] " Gage Eads
2017-05-11 16:38 ` Jerin Jacob
2017-05-16 20:51 ` Thomas Monjalon
2017-05-24 4:30 ` Rao, Nikhil
2017-06-19 10:05 ` Jerin Jacob
2017-06-26 13:19 ` Jerin Jacob
2017-06-28 6:47 ` Rao, Nikhil
2017-07-06 21:52 ` [dpdk-dev] [PATCH 1/2] " Nikhil Rao
2017-07-06 14:18 ` Jerin Jacob
2017-07-07 6:21 ` Rao, Nikhil
2017-07-07 15:03 ` Jerin Jacob
2017-07-07 15:57 ` Jerin Jacob
2017-07-10 6:14 ` Rao, Nikhil
2017-07-10 10:41 ` Jerin Jacob
2017-07-13 3:26 ` Rao, Nikhil
2017-07-13 18:45 ` Jerin Jacob
2017-07-27 10:58 ` Rao, Nikhil
2017-07-29 15:12 ` Jerin Jacob
2017-07-31 3:57 ` Nipun Gupta
2017-07-31 15:31 ` Jerin Jacob
2017-08-01 8:40 ` Rao, Nikhil
2017-08-01 16:42 ` Jerin Jacob
2017-08-02 19:19 ` Eads, Gage
2017-08-03 6:23 ` Jerin Jacob
2017-08-09 2:23 ` Eads, Gage
2017-08-09 16:19 ` Jerin Jacob
2017-08-09 19:24 ` Eads, Gage
2017-08-10 16:53 ` Jerin Jacob [this message]
2017-08-14 8:48 ` Rao, Nikhil
2017-08-14 11:11 ` Jerin Jacob
2017-08-16 5:06 ` Rao, Nikhil
2017-08-11 5:25 ` Rao, Nikhil
2017-08-11 9:49 ` Jerin Jacob
2017-09-04 6:37 ` Jerin Jacob
2017-07-06 21:52 ` [dpdk-dev] [PATCH 2/2] eventdev: add event eth rx adapter unit tests Nikhil Rao
2017-07-24 10:10 ` [dpdk-dev] [PATCH 1/2] eventdev: add event adapter for ethernet Rx queues Nipun Gupta
2017-07-24 10:24 ` Jerin Jacob
2017-07-24 11:37 ` Nipun Gupta
2017-07-24 10:32 ` Van Haaren, Harry
2017-07-24 13:06 ` Nipun Gupta
2017-07-24 13:33 ` Van Haaren, Harry
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