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

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Date:   Mon, 9 Jan 2017 19:39:54 -0800
From:   "Vishwanathapura, Niranjana" <niranjana.vishwanathapura@...el.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        "ira.weiny" <ira.weiny@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        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 Mon, Jan 09, 2017 at 09:51:04AM +0200, Leon Romanovsky wrote:
>On Thu, Dec 15, 2016 at 11:28:06AM -0500, Doug Ledford wrote:
>> On 12/15/2016 9:52 AM, ira.weiny wrote:
>>
>> 2) With more than 60% of the code being MAD related, and another
>> significant chunk being hfi related, and only a minor bit (20% maybe?)
>> being net related,
>
>Hi Doug and Ira,
>
>I may admit that I didn't read the code very deep, but from brief
>overview, I didn't find support for the claim the "60% code is MAD related".
>It looks like the opposite thing will be more accurate.
>
>Can you help me to understand this claim? How did you come to this
>conclusion?
>
>Thanks

Hi Leon,

Here is the breakdown of patches based on functionality.
In this series, patches #3..#8 compose hfi_vnic driver. In that, patches #4, #7 
and #8 are MAD focused (interfacing with MAD agent and handling MAD packets).
Patch #6 and half of #3 (_encap.c/h) are OPA encapsulation related. Patch #5 is 
netdev statistic related (which includes statistics MAD definitions).
So, only part of patch #3 (_netdev.c and _ethtool.c) deals with interfacing 
with netstack.
Those percentage numbers are based on actual lines of code in these patches 
(files).

We are also looking into Jason’s suggestion to make hfi_vnic interface to the 
bottom driver a generic interface. This will include moving some of the 
netstack interfacing to the bottom hfi1 driver.

Niranjana