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

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Date:   Wed, 13 Jul 2022 07:36:53 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Ajay Sharma <sharmaajay@...rosoft.com>,
        Long Li <longli@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "shiraz.saleem@...el.com" <shiraz.saleem@...el.com>
CC:     "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>
Subject: RE: [Patch v4 12/12] RDMA/mana_ib: Add a driver for Microsoft Azure
 Network Adapter

> From: Ajay Sharma <sharmaajay@...rosoft.com>
> Sent: Tuesday, July 12, 2022 9:33 PM
> >  ...
> > +	switch (mr_params->mr_type) {
> > +	case GDMA_MR_TYPE_GVA:
> > +		req.mr_type = GDMA_MR_TYPE_GVA;
> > +		req.gva.dma_region_handle = mr_params->gva.dma_region_handle;
> > +		req.gva.virtual_address = mr_params->gva.virtual_address;
> > +		req.gva.access_flags = mr_params->gva.access_flags;
> > +		break;
> > +
> > +	case GDMA_MR_TYPE_GPA:
> > +		req.mr_type = GDMA_MR_TYPE_GPA;
> > +		req.gpa.access_flags = mr_params->gpa.access_flags;
> > +		break;
> > +
> > +	case GDMA_MR_TYPE_FMR:
> > +		req.mr_type = GDMA_MR_TYPE_FMR;
> > +		req.fmr.page_size = mr_params->fmr.page_size;
> > +		req.fmr.reserved_pte_count = mr_params->fmr.reserved_pte_count;
> > +		break;
> > +
> > +	default:
> > +		ibdev_dbg(&dev->ib_dev,
> > +			  "invalid param (GDMA_MR_TYPE) passed, type %d\n",
> > +			  req.mr_type);
> 
> Here req.mr_type is always 0.
> We should remove the 3 above lines of "req.mr_type = ...", and add a line
> "req.mr_type = mr_params->mr_type;" before the "switch" line..
> 
> No, That's incorrect. The mr_type is being explicitly set here to control what
> regions get exposed to the user and kernel. GPA and FMR are never exposed to
> user. So we cannot assign req.mr_type = mr_params->mr_type.

I'm not following you. I meant the below change, which should have no
functional change, right? In the "default:" branch , we just "goto error;", so
there is no functional change either.

--- drivers/infiniband/hw/mana/main.c.orig
+++ drivers/infiniband/hw/mana/main.c
@@ -394,21 +394,19 @@
                             sizeof(resp));
        req.pd_handle = mr_params->pd_handle;

+       req.mr_type = mr_params->mr_type;
        switch (mr_params->mr_type) {
        case GDMA_MR_TYPE_GVA:
-               req.mr_type = GDMA_MR_TYPE_GVA;
                req.gva.dma_region_handle = mr_params->gva.dma_region_handle;
                req.gva.virtual_address = mr_params->gva.virtual_address;
                req.gva.access_flags = mr_params->gva.access_flags;
                break;

        case GDMA_MR_TYPE_GPA:
-               req.mr_type = GDMA_MR_TYPE_GPA;
                req.gpa.access_flags = mr_params->gpa.access_flags;
                break;

        case GDMA_MR_TYPE_FMR:
-               req.mr_type = GDMA_MR_TYPE_FMR;
                req.fmr.page_size = mr_params->fmr.page_size;
                req.fmr.reserved_pte_count = mr_params->fmr.reserved_pte_count;
                break;