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

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Message-ID: <4e22bf29-2260-0768-ab17-9a8df6306f37@redhat.com>
Date:   Thu, 15 Dec 2016 13:19:18 -0500
From:   Doug Ledford <dledford@...hat.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.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 12/15/2016 12:07 PM, Jason Gunthorpe wrote:
> 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.

Yes, see my comments in point #3 of my previous email...

> 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
> 


-- 
Doug Ledford <dledford@...hat.com>
    GPG Key ID: 0E572FDD



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