netdev - Re: [PATCH v9 16/17] vduse: Introduce VDUSE

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Date:   Wed, 14 Jul 2021 13:45:10 +0800
From:   Yongji Xie <xieyongji@...edance.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Parav Pandit <parav@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Christian Brauner <christian.brauner@...onical.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>, bcrl@...ck.org,
        Jonathan Corbet <corbet@....net>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        joro@...tes.org, Greg KH <gregkh@...uxfoundation.org>,
        He Zhe <zhe.he@...driver.com>,
        Liu Xiaodong <xiaodong.liu@...el.com>,
        songmuchun@...edance.com,
        virtualization <virtualization@...ts.linux-foundation.org>,
        netdev@...r.kernel.org, kvm <kvm@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 16/17] vduse: Introduce VDUSE - vDPA Device in Userspace

On Wed, Jul 14, 2021 at 10:54 AM Jason Wang <jasowang@...hat.com> wrote:
>
>
> 在 2021/7/13 下午9:27, Dan Carpenter 写道:
> > On Tue, Jul 13, 2021 at 04:46:55PM +0800, Xie Yongji wrote:
> >> +static int vduse_dev_init_vdpa(struct vduse_dev *dev, const char *name)
> >> +{
> >> +    struct vduse_vdpa *vdev;
> >> +    int ret;
> >> +
> >> +    if (dev->vdev)
> >> +            return -EEXIST;
> >> +
> >> +    vdev = vdpa_alloc_device(struct vduse_vdpa, vdpa, dev->dev,
> >> +                             &vduse_vdpa_config_ops, name, true);
> >> +    if (!vdev)
> >> +            return -ENOMEM;
> > This should be an IS_ERR() check instead of a NULL check.
>
>
> Yes.
>
>
> >
> > The vdpa_alloc_device() macro is doing something very complicated but
> > I'm not sure what.  It calls container_of() and that looks buggy until
> > you spot the BUILD_BUG_ON_ZERO() compile time assert which ensures that
> > the container_of() is a no-op.
> >
> > Only one of the callers checks for error pointers correctly so maybe
> > it's too complicated or maybe there should be better documentation.
>
>
> We need better documentation for this macro and fix all the buggy callers.
>
> Yong Ji, want to do that?
>

Sure, I will send the fix soon.

Thanks,
Yongji