linux-kernel - Re: [PATCH V8 5/9] vDPA: introduce vDPA bus

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Message-ID: <20200325122949.GW13183@mellanox.com>
Date:   Wed, 25 Mar 2020 09:29:49 -0300
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        maxime.coquelin@...hat.com, cunming.liang@...el.com,
        zhihong.wang@...el.com, rob.miller@...adcom.com,
        xiao.w.wang@...el.com, lingshan.zhu@...el.com, eperezma@...hat.com,
        lulu@...hat.com, parav@...lanox.com, kevin.tian@...el.com,
        stefanha@...hat.com, rdunlap@...radead.org, hch@...radead.org,
        aadam@...hat.com, jiri@...lanox.com, shahafs@...lanox.com,
        hanand@...inx.com, mhabets@...arflare.com, gdawar@...inx.com,
        saugatm@...inx.com, vmireyno@...vell.com
Subject: Re: [PATCH V8 5/9] vDPA: introduce vDPA bus

On Wed, Mar 25, 2020 at 04:27:07PM +0800, Jason Wang wrote:
> +struct vdpa_device *__vdpa_alloc_device(struct device *parent,
> +					const struct vdpa_config_ops *config,
> +					size_t size);
> +
> +#define vdpa_alloc_device(dev_struct, member, parent, config)   \
> +			  container_of(__vdpa_alloc_device( \
> +				       parent, config, \
> +				       sizeof(struct dev_struct) + \
> +				       BUILD_BUG_ON_ZERO(offsetof( \
> +				       struct dev_struct, member))), \
> +				       struct dev_struct, member)

This all looks robust now, one minor remark is to not do 'struct
dev_struct' here so the caller has to do

   vdpa_alloc_device(struct foo, vpda, ...)

Which suggests to the reader something unusual is happening

Jason