linux-kernel - RE: [PATCH 1/1] Drivers: infiniband: hw: vmbus-nd: NetworkDirect driver for Linux

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Message-ID: <DM2PR0301MB0783A488E36D1BFAC43A4704A00F0@DM2PR0301MB0783.namprd03.prod.outlook.com>
Date:	Wed, 27 Jul 2016 22:32:36 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Leon Romanovsky <leon@...nel.org>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"yishaih@...lanox.com" <yishaih@...lanox.com>,
	"sean.hefty@...el.com" <sean.hefty@...el.com>,
	"dledford@...hat.com" <dledford@...hat.com>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"leann.ogasawara@...onical.com" <leann.ogasawara@...onical.com>,
	Long Li <longli@...rosoft.com>
Subject: RE: [PATCH 1/1] Drivers: infiniband: hw: vmbus-nd: NetworkDirect
 driver for Linux



> -----Original Message-----
> From: Leon Romanovsky [mailto:leon@...nel.org]
> Sent: Tuesday, July 26, 2016 9:25 PM
> To: KY Srinivasan <kys@...rosoft.com>
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; linux-rdma@...r.kernel.org;
> yishaih@...lanox.com; sean.hefty@...el.com; dledford@...hat.com;
> olaf@...fle.de; apw@...onical.com; vkuznets@...hat.com;
> jasowang@...hat.com; leann.ogasawara@...onical.com; Long Li
> <longli@...rosoft.com>
> Subject: Re: [PATCH 1/1] Drivers: infiniband: hw: vmbus-nd: NetworkDirect
> driver for Linux
> 
> On Tue, Jul 26, 2016 at 07:05:37PM -0700, kys@...hange.microsoft.com
> wrote:
> > From: K. Y. Srinivasan <kys@...rosoft.com>
> >
> > This driver is a bridge driver that surfaces a Mellanox device in the Linux
> guest and plugs into
> > the "NetworkDirect" RDMA infrastructure on the Windows host. Only a subset
> of the ibverbs are
> > implemented (this decision is based on the verbs supported by the Windows
> host).
> > The control path is implemented over the vmbus using the NetworkDirect
> protocol for
> > virtualized environments. The data path bypasses the guest and host kernel
> and the NIC is able to RDMA
> > into guest addresses.
> >
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > ---
> >  drivers/infiniband/Kconfig                  |    1 +
> >  drivers/infiniband/hw/Makefile              |    1 +
> >  drivers/infiniband/hw/vmbus-nd/Kconfig      |    5 +
> >  drivers/infiniband/hw/vmbus-nd/Makefile     |    3 +
> >  drivers/infiniband/hw/vmbus-nd/hvnd_addr.c  |  292 +++
> >  drivers/infiniband/hw/vmbus-nd/mx_abi.h     |  232 ++
> >  drivers/infiniband/hw/vmbus-nd/provider.c   | 2844
> ++++++++++++++++++++++++
> >  drivers/infiniband/hw/vmbus-nd/vmbus_rdma.c | 3086
> +++++++++++++++++++++++++++
> >  drivers/infiniband/hw/vmbus-nd/vmbus_rdma.h | 2205
> +++++++++++++++++++
> >  9 files changed, 8669 insertions(+), 0 deletions(-)
> 
> If your final goal is to merge this driver into Linux kernel, so I will
> ask from you to do the following actions:

Yes, our final goal is to get the driver into the Linux Kernel.

> 
> 1. Split this patch to smaller patches to allow review.

In the past I have submitted new drivers as a single patch and that is what I did here.
That said, I will try to breakup this driver on a per verb implementation basis. Hope that
is adequate for making the review easy.

> You can see as an example - latest submission of "Add Paravirtual RDMA
> Driver" [1].
> 2. Fix licenses, magic numbers, remove creepy comments and learn about
> MAINTAINERS file.
> 3. Use preferred for this susbsystem title format.

I will do that.

> 4. Find the relevant mailing list and maintainer for this submission and
> don't add unrelated people.

I looked at the MAINTAINERS file and selected the addresses that I thought I should send to.
Sean Hefty (from Intel) helped me during the initial implementation and so I included him.
In my next submission, I will do as you are recommending here.

Leon,

Thank you for your comments and I will address them all in my next submission.

Regards,

K. Y
> 
> Thanks.
> 
> [1] http://marc.info/?l=linux-rdma&m=146835226218818&w=2
> 
> >  create mode 100644 drivers/infiniband/hw/vmbus-nd/Kconfig
> >  create mode 100644 drivers/infiniband/hw/vmbus-nd/Makefile
> >  create mode 100644 drivers/infiniband/hw/vmbus-nd/hvnd_addr.c
> >  create mode 100644 drivers/infiniband/hw/vmbus-nd/mx_abi.h
> >  create mode 100644 drivers/infiniband/hw/vmbus-nd/provider.c
> >  create mode 100644 drivers/infiniband/hw/vmbus-nd/vmbus_rdma.c
> >  create mode 100644 drivers/infiniband/hw/vmbus-nd/vmbus_rdma.h