netdev - Re: [net-next PATCH v2 0/9] Introduce NAPI queues support

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Message-ID: <35f733b5-577e-4529-b63b-30dc1d6568e5@intel.com>
Date: Wed, 23 Aug 2023 16:49:17 -0700
From: "Nambiar, Amritha" <amritha.nambiar@...el.com>
To: David Laight <David.Laight@...LAB.COM>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "kuba@...nel.org" <kuba@...nel.org>,
	"davem@...emloft.net" <davem@...emloft.net>
CC: "sridhar.samudrala@...el.com" <sridhar.samudrala@...el.com>
Subject: Re: [net-next PATCH v2 0/9] Introduce NAPI queues support

On 8/23/2023 3:24 AM, David Laight wrote:
> From: Amritha Nambiar
>> Sent: Tuesday, August 22, 2023 12:25 AM
>>
>> Introduce support for associating NAPI instances with
>> corresponding RX and TX queue set. Add the capability
>> to export NAPI information supported by the device.
>> Extend the netdev_genl generic netlink family for netdev
>> with NAPI data. The NAPI fields exposed are:
>> - NAPI id
>> - NAPI device ifindex
>> - queue/queue-set (both RX and TX) associated with each
>>    NAPI instance
>> - Interrupt number associated with the NAPI instance
>> - PID for the NAPI thread
>>
>> This series only supports 'get' ability for retrieving
>> certain NAPI attributes. The 'set' ability for setting
>> queue[s] associated with a NAPI instance via netdev-genl
>> will be submitted as a separate patch series.
>>
>> Previous discussion at:
>> https://lore.kernel.org/netdev/c8476530638a5f4381d64db0e024ed49c2db3b02.camel@gmail.com/T/#m00999652a8
>> b4731fbdb7bf698d2e3666c65a60e7
> 
> Not of this answers: what is it for?

The use-case is to limit the number of napi instances for the queues
within a queue-group. Other discussions at 
https://lore.kernel.org/netdev/20230524111259.1323415-2-bigeasy@linutronix.de/ 
also explains the need.

> 
> 	David
> 
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
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