Re: [dpdk-dev] [PATCH 0/2] Native uio-based PMD for Mellanox ConnectX-3 devices

[Keunhong Lee <dlrmsghd@gmail.com>]

We found that optimizing fragmentation configuration of mlx4 driver
performs as fast as native PMD.
I think we have to re-consider using native driver rather than ib driver.

Keunhong.

2015-07-07 1:14 GMT+09:00 Thomas Monjalon <thomas.monjalon@6wind.com>:

> 2015-07-07 00:57, Keunhong Lee:
> > Answer 1. UIO based driver is faster then ib based driver.
> > It can saturate 40G link with MTU sized packets using a single thread
> while
> > ib wrapper cannot.
>
> OK, interesting. Do you have numbers and details about your
> testbed/scenario?
>
> > Answer 2. Sorry, I missed that. I'll make a new patch email with my real
> > name.
> >
> > Question 1. Is it OK if I separate GPL-based and BSD-based codes into
> > separated patches?
> > mlx4 kernel driver itself is dual licenses, so I think they are
> considered
> > as BSD in my source code.
> > The only source code under GPL is bitmap, integer logarithm, and
> red-black
> > tree contained in mlnx_uio/kernel directory.
>
> These parts will be built in the user-space driver library, right?
> It would change the license, which is not desirable.
>
> Technically, your approach may be interesting.
> But from a maintenance point of view, this huge codebase may be a
> nightmare.
>
>
> > 2015-07-06 23:17 GMT+09:00 Thomas Monjalon <thomas.monjalon@6wind.com>:
> >
> > > 2015-07-06 22:28, leeopop:
> > > > This is a native UIO-based PMD for Mellanox ConnectX-3 devices.
> > > > It uses a persistent memory library in order to provide a persistent
> > > > scartch area for the mlx4 HCA driver.
> > >
> > > What is the benefit of this UIO approach compared to the OFED based
> driver?
> > >
> > > > We release the driver itself under BSD license, but to use it for
> > > > commercial products, you may have to re-implement the separated GPL
> > > > sources.
> > >
> > > The GPL sources are not really separated.
> > > The DPDK libraries must be BSD-licensed.
> > >
> > > > The GPL affected source codes reside in the mlnx_uio/kernel
> directory.
> > >
> > > It seems that a large part of the GPL driver was also copied in
> > > mlnx_uio/mlnx/.
> > >
> > > Given that you are dropping a huge GPL codebase (whose you don't own
> the
> > > copyright) in a BSD library, and that you didn't give your real name in
> > > the signed-off line, it is NACK.
>
>
>
>