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

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Message-ID: <c409964b-3f07-cac9-937c-4062f879cb85@intel.com>
Date:   Wed, 18 Nov 2020 16:41:38 -0800
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Parav Pandit <parav@...dia.com>, David Ahern <dsahern@...il.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 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?