netdev - RE: [EXTERNAL] Re: [Patch v4 12/12] RDMA/mana_ib: Add a driver for Microsoft Azure Network Adapter

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Date:   Thu, 21 Jul 2022 19:24:14 +0000
From:   Ajay Sharma <sharmaajay@...rosoft.com>
To:     Jason Gunthorpe <jgg@...dia.com>, Long Li <longli@...rosoft.com>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Leon Romanovsky <leon@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "shiraz.saleem@...el.com" <shiraz.saleem@...el.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Ajay Sharma <sharmaajay@...rosoft.com>
Subject: RE: [EXTERNAL] Re: [Patch v4 12/12] RDMA/mana_ib: Add a driver for
 Microsoft Azure Network Adapter



> -----Original Message-----
> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Wednesday, July 20, 2022 6:49 PM
> To: Long Li <longli@...rosoft.com>
> Cc: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; Stephen Hemminger
> <sthemmin@...rosoft.com>; Wei Liu <wei.liu@...nel.org>; Dexuan Cui
> <decui@...rosoft.com>; David S. Miller <davem@...emloft.net>; Jakub
> Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>; Leon
> Romanovsky <leon@...nel.org>; edumazet@...gle.com;
> shiraz.saleem@...el.com; Ajay Sharma <sharmaajay@...rosoft.com>; linux-
> hyperv@...r.kernel.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-rdma@...r.kernel.org
> Subject: [EXTERNAL] Re: [Patch v4 12/12] RDMA/mana_ib: Add a driver for
> Microsoft Azure Network Adapter
> 
> On Wed, Jun 15, 2022 at 07:07:20PM -0700, longli@...uxonhyperv.com
> wrote:
> 
> > +static int mana_ib_alloc_pd(struct ib_pd *ibpd, struct ib_udata
> > +*udata) {
> > +	struct mana_ib_pd *pd = container_of(ibpd, struct mana_ib_pd, ibpd);
> > +	struct ib_device *ibdev = ibpd->device;
> > +	enum gdma_pd_flags flags = 0;
> > +	struct mana_ib_dev *dev;
> > +	int ret;
> > +
> > +	dev = container_of(ibdev, struct mana_ib_dev, ib_dev);
> > +
> > +	/* Set flags if this is a kernel request */
> > +	if (!ibpd->uobject)
> > +		flags = GDMA_PD_FLAG_ALLOW_GPA_MR |
> GDMA_PD_FLAG_ALLOW_FMR_MR;
> 
> I'm confused, this driver doesn't seem to support kverbs:
> 
> > +static const struct ib_device_ops mana_ib_dev_ops = {
> > +	.owner = THIS_MODULE,
> > +	.driver_id = RDMA_DRIVER_MANA,
> > +	.uverbs_abi_ver = MANA_IB_UVERBS_ABI_VERSION,
> > +
> > +	.alloc_pd = mana_ib_alloc_pd,
> > +	.alloc_ucontext = mana_ib_alloc_ucontext,
> > +	.create_cq = mana_ib_create_cq,
> > +	.create_qp = mana_ib_create_qp,
> > +	.create_rwq_ind_table = mana_ib_create_rwq_ind_table,
> > +	.create_wq = mana_ib_create_wq,
> > +	.dealloc_pd = mana_ib_dealloc_pd,
> > +	.dealloc_ucontext = mana_ib_dealloc_ucontext,
> > +	.dereg_mr = mana_ib_dereg_mr,
> > +	.destroy_cq = mana_ib_destroy_cq,
> > +	.destroy_qp = mana_ib_destroy_qp,
> > +	.destroy_rwq_ind_table = mana_ib_destroy_rwq_ind_table,
> > +	.destroy_wq = mana_ib_destroy_wq,
> > +	.disassociate_ucontext = mana_ib_disassociate_ucontext,
> > +	.get_port_immutable = mana_ib_get_port_immutable,
> > +	.mmap = mana_ib_mmap,
> > +	.modify_qp = mana_ib_modify_qp,
> > +	.modify_wq = mana_ib_modify_wq,
> > +	.query_device = mana_ib_query_device,
> > +	.query_gid = mana_ib_query_gid,
> > +	.query_port = mana_ib_query_port,
> > +	.reg_user_mr = mana_ib_reg_user_mr,
> 
> eg there is no way to create a kernel MR..
> 
> So, why do I see so many kverbs like things - and why are things like FMR in
> this driver that can never be used?
> 
> Jason

The idea was to introduce kernel support in future. I will remove it from the code and upload the patch.