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

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Message-ID: <5ddfcf07-2d3c-17ac-2db8-4f657506c2fd@gmail.com>
Date:   Wed, 18 Nov 2020 18:17:05 -0700
From:   David Ahern <dsahern@...il.com>
To:     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 11/18/20 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).