netdev - RE: [Patch v4 06/12] net: mana: Define data structures for protection domain and memory registration

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Date:   Wed, 13 Jul 2022 07:22:19 +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 06/12] net: mana: Define data structures for protection
 domain and memory registration

> From: Ajay Sharma <sharmaajay@...rosoft.com>
> Sent: Tuesday, July 12, 2022 9:39 PM
> To: Dexuan Cui <decui@...rosoft.com>; Long Li <longli@...rosoft.com>; KY
>  ...
> > The definition of struct gdma_create_mr_params is not naturally aligned.
> > This can potenially cause issues.
> This is union and so the biggest element is aligned to word. I feel since this is
> not passed to the hw it should be fine.

Ajay, you're right. I didn't realize struct gdma_create_mr_params is not really
passed to the PF driver or the device. Please ignore my comments on
struct gdma_create_mr_params. Sorry for the confusion!

> > BTW, Haiyang added "/* HW DATA */ " to other definitions, e.g.
> > gdma_create_queue_resp. Can you please add the same comment for
> > consistency?
It's still recommended that we add the tag "/* HW DATA */ " to new definitions
that are passed to the PF driver or the device.

> > +struct gdma_create_mr_request {
> > +	struct gdma_req_hdr hdr;
> > +	gdma_obj_handle_t pd_handle;
> > +	enum gdma_mr_type mr_type;
> > +	u32 reserved;
> > +
> > +	union {
> > +		struct {
> > +			enum gdma_mr_access_flags access_flags;
> > +		} gpa;
> > +
> > +		struct {
> > +			gdma_obj_handle_t dma_region_handle;
> > +			u64 virtual_address;
> > +			enum gdma_mr_access_flags access_flags;
> 
> Similarly, there is a hidden u32 field here. We should explicitly define it.

The issue with struct gdma_create_mr_request is valid, since it's
passed to the PF driver. We should explicitly define the hidden field.