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

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Date:   Wed, 20 Jul 2022 20:49:24 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     longli@...rosoft.com
Cc:     "K. Y. 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: 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