netdev - Re: [pull request][net-next V10 00/14] Add mlx5 subfunction support

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Date:   Mon, 25 Jan 2021 12:05:57 -0800
From:   Edwin Peer <edwin.peer@...adcom.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Parav Pandit <parav@...dia.com>, Saeed Mahameed <saeed@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Sridhar Samudrala <sridhar.samudrala@...el.com>,
        David Ahern <dsahern@...nel.org>,
        Kiran Patil <kiran.patil@...el.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        "Ertman, David M" <david.m.ertman@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [pull request][net-next V10 00/14] Add mlx5 subfunction support

On Mon, Jan 25, 2021 at 11:49 AM Jason Gunthorpe <jgg@...dia.com> wrote:

> I've never seen someone implement a NumVF > 256 by co-opting the bus
> number.

Usually the VF offset already places the VF routing IDs into a
different bus number range from the PF. That much at least works
today.

> Can Linux even assign more bus numbers to a port without firmware
> help? Bus numbers are something that requires the root complex to be
> aware of to setup routability.

I'm not sure, presumably something already infers this for the first
additional bus number based on the SR-IOV config capability?

Regards,
Edwin Peer

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