Re: [PATCH 1/2] eventdev: add event adapter for ethernet Rx queues

-----Original Message-----
From: Jerin Jacob [mailto:jerin.jacob@caviumnetworks.com]
Sent: Monday, July 24, 2017 15:54
To: Nipun Gupta <redacted>
Cc: Nikhil Rao <redacted>; gage.eads@intel.com; dev@dpdk.org;
thomas@monjalon.net; bruce.richardson@intel.com;
harry.van.haaren@intel.com; Hemant Agrawal [off-list ref];
narender.vangati@intel.com; Abhinandan Gujjar
[off-list ref]
Subject: Re: [PATCH 1/2] eventdev: add event adapter for ethernet Rx queues

-----Original Message-----

quoted

Date: Mon, 24 Jul 2017 10:10:50 +0000
From: Nipun Gupta <redacted>
To: Nikhil Rao <redacted>, "jerin.jacob@caviumnetworks.com"
 [off-list ref]
CC: "gage.eads@intel.com" <redacted>, "dev@dpdk.org"
 [off-list ref], "thomas@monjalon.net" [off-list ref],
 "bruce.richardson@intel.com" [off-list ref],
 "harry.van.haaren@intel.com" [off-list ref], Hemant

Agrawal

quoted

 [off-list ref], "narender.vangati@intel.com"
 [off-list ref], Abhinandan Gujjar
 [off-list ref]
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

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it seems that this indeed will not fit with the cases where ethdev is capable of

enqueing packets

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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

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HW configs. e.g. In queue case - rte_eventdev and rte_ethdev - both PMDs at

hw level shall be configured.

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A typical eventdev hardware will require queues of eth devices will be

configured to directly attach to

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eventdev in the hardware.

Mapping it to NXP eventdev, enabling this functionality requires some

configuration where dev private

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information of both the devices (event dev and eth dev) is required at the same

time,

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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.

quoted

Jerin,

I have an impression that Cavium hardware has H/W capability to inject

packets from Ethernet

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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

quoted

Thanks,
Nipun