[dpdk-dev] [PATCH 1/2] eventdev: add event adapter for ethernet Rx queues

[Nipun Gupta]

> -----Original Message-----
> From: Jerin Jacob [mailto:jerin.jacob at caviumnetworks.com]
> Sent: Monday, July 24, 2017 15:54
> To: Nipun Gupta <nipun.gupta at nxp.com>
> Cc: Nikhil Rao <nikhil.rao at intel.com>; gage.eads at intel.com; dev at dpdk.org;
> thomas at monjalon.net; bruce.richardson at intel.com;
> harry.van.haaren at intel.com; Hemant Agrawal <hemant.agrawal at nxp.com>;
> narender.vangati at intel.com; Abhinandan Gujjar
> <abhinandan.gujjar at intel.com>
> Subject: Re: [PATCH 1/2] eventdev: add event adapter for ethernet Rx queues
> 
> -----Original Message-----
> > Date: Mon, 24 Jul 2017 10:10:50 +0000
> > From: Nipun Gupta <nipun.gupta at nxp.com>
> > To: Nikhil Rao <nikhil.rao at intel.com>, "jerin.jacob at caviumnetworks.com"
> >  <jerin.jacob at caviumnetworks.com>
> > CC: "gage.eads at intel.com" <gage.eads at intel.com>, "dev at dpdk.org"
> >  <dev at dpdk.org>, "thomas at monjalon.net" <thomas at monjalon.net>,
> >  "bruce.richardson at intel.com" <bruce.richardson at intel.com>,
> >  "harry.van.haaren at intel.com" <harry.van.haaren at intel.com>, Hemant
> Agrawal
> >  <hemant.agrawal at nxp.com>, "narender.vangati at intel.com"
> >  <narender.vangati at intel.com>, Abhinandan Gujjar
> >  <abhinandan.gujjar at intel.com>
> > Subject: RE: [PATCH 1/2] eventdev: add event adapter for ethernet Rx queues
> >
> > Looking at the rte_event_eth_rx_adapter_queue_add &
> event_eth_rx_adapter_service_func
> > it seems that this indeed will not fit with the cases where ethdev is capable of
> enqueing packets
> > to the eventdev (as was mentioned in Jerin's first RFC).
> >
> > In case of hardware based eventdev and queues, these function should also
> invoke respective PMD
> > HW configs. e.g. In queue case - rte_eventdev and rte_ethdev - both PMDs at
> hw level shall be configured.
> >
> > A typical eventdev hardware will require queues of eth devices will be
> configured to directly attach to
> > eventdev in the hardware.
> >
> > Mapping it to NXP eventdev, enabling this functionality requires some
> configuration where dev private
> > information of both the devices (event dev and eth dev) is required at the same
> time,
> > and the final configuration is provided via eth device to H/W. So, this require
> inter device communication in DPDK.
> 
> Just like dpaa2 bus layer functions used in another subsystems. You
> can export a function from ethdev dpaa2 to eventdev dpaa2 for ethdev rx queue
> to eventdev queue connection.

Yes! That could be done to resolve PMD interdependencies.

> 
> >
> > Jerin,
> >
> > I have an impression that Cavium hardware has H/W capability to inject
> packets from Ethernet
> > devices to event devices? If yes, how do you plan to support it?
> 
> Please check the latest review comments on this patch set
> http://dpdk.org/dev/patchwork/patch/26534/.
> 
> Nikhil is changing ops(function pointer) based approach. With that HW
> support can be added.

This looks great :). Somehow missed them.

Thanks,
Nipun

> 
> >
> > Thanks,
> > Nipun
> >