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List:       freebsd-net
Subject:    Re: does qlnxe 100G support DAC splitter?
From:       Nick Wolff <darkfiberiru () gmail ! com>
Date:       2019-07-24 20:36:28
Message-ID: CACxAneAoBWaTSfTHXt1JoqOHvz0FOmTdvmVPN-1+yZS+3ruK=Q () mail ! gmail ! com
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Ronald,

If you don't need to do both at the same time or have a dual port 100g nic
you should be able to use adapters like this
https://www.fs.com/products/75320.html to go from qsfp+ to sfp+ or the
qsfp28 variant for 25g

On Sun, Jul 21, 2019 at 10:40 AM Ronald Khoo <ronald@taufilms.com> wrote:

> hi freebsd-net,
>
> two questions:
>
> a. does the qlnxe driver support treating one 100G port as four separate
> 25G ethernet interfaces via a QSFP28 to 4 x SP25 DAC splitter cable?
>
> b. and does it work for one of those to be plugged into a 10G SFP+ switch?
>
> trying to figure out an upgrade path from 10G to 25G to 100G  on a slot
> constrained server -- a recent TYAN which only has one proprietary slot for
> a high speed NIC and I'd like to be able to connect to both a current 10G
> switch as well as a 100G switch in future (at 25 while migrating and then
> at 100 once done).
>
> the alternative would be to buy a dual 10G NIC initially and then throw it
> away when going to 100G -- I'm wondering if I can avoid that.
>
> thanks!
> ronald
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