netdev - Re: [RFC v2 00/10] HFI Virtual Network Interface Controller (VNIC)

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Message-ID: <20161215170713.GD3264@obsidianresearch.com>
Date:   Thu, 15 Dec 2016 10:07:13 -0700
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Doug Ledford <dledford@...hat.com>
Cc:     "ira.weiny" <ira.weiny@...el.com>,
        Leon Romanovsky <leon@...nel.org>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Vishwanathapura, Niranjana" <niranjana.vishwanathapura@...el.com>,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        dennis.dalessandro@...el.com
Subject: Re: [RFC v2 00/10] HFI Virtual Network Interface Controller (VNIC)

On Thu, Dec 15, 2016 at 11:28:06AM -0500, Doug Ledford wrote:

> 1) Since your intent is to make this work with multiple versions of the
> hfi drivers, I disagree with Jason that just because there is only one
> driver today that we should keep it simple.  Design it right from the
> beginning of multi driver is your intent is, IMO, a better way to go.
> You'll work out the bugs in the initial implementation and when it comes
> time to add the second driver, things will go much more smoothly.

If that is your position then this should be a straight up IB ULP that
works with any IB hardware.

There is nothing HFI specific about it except for the
micro-optimization of pushing packets via SDMA instead of post_send,
and that same micro optimization probably applies to ipoib.

In other words, lets see the first version as a straight ULP with no
special HFI hooks, then we can discuss how best to micro optimize it
for HFI SDMA.

Jason