netdev - Re: [PATCH net-next 03/13] devlink: Support add and delete devlink port

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Date:   Wed, 18 Nov 2020 17:56:05 -0800
From:   "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To:     David Ahern <dsahern@...il.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Parav Pandit <parav@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Cc:     Jiri Pirko <jiri@...dia.com>, Jason Gunthorpe <jgg@...dia.com>,
        "dledford@...hat.com" <dledford@...hat.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Vu Pham <vuhuong@...dia.com>
Subject: Re: [PATCH net-next 03/13] devlink: Support add and delete devlink
 port



On 11/18/2020 5:17 PM, David Ahern wrote:
> On 11/18/20 5:41 PM, Jacob Keller wrote:
>>
>>
>> On 11/18/2020 11:22 AM, Parav Pandit wrote:
>>>
>>>
>>>> From: David Ahern <dsahern@...il.com>
>>>> Sent: Wednesday, November 18, 2020 11:33 PM
>>>>
>>>>
>>>> With Connectx-4 Lx for example the netdev can have at most 63 queues
>>>> leaving 96 cpu servers a bit short - as an example of the limited number of
>>>> queues that a nic can handle (or currently exposes to the OS not sure which).
>>>> If I create a subfunction for ethernet traffic, how many queues are allocated
>>>> to it by default, is it managed via ethtool like the pf and is there an impact to
>>>> the resources used by / available to the primary device?
>>>
>>> Jason already answered it with details.
>>> Thanks a lot Jason.
>>>
>>> Short answer to ethtool question, yes, ethtool can change num queues for subfunction like PF.
>>> Default is same number of queues for subfunction as that of PF in this patchset.
>>>
>>
>> But what is the mechanism for partitioning the global resources of the
>> device into each sub function?
>>
>> Is it just evenly divided into the subfunctions? is there some maximum
>> limit per sub function?
>>
> 
> I hope it is not just evenly divided; it should be user controllable. If
> I create a subfunction for say a container's networking, I may want to
> only assign 1 Rx and 1 Tx queue pair (or 1 channel depending on
> terminology where channel includes Rx, Tx and CQ).

I think we need a way to expose and configure policy for resources 
associated with each type of auxiliary device.
   For ex: default, min and max queues and interrupt vectors.

Once an auxiliary device is created, the user should be able to 
configure the resources within the allowed min-max values.