netdev - Re: [PATCH v10 25/41] virtio_pci: struct virtio_pci_common_cfg add queue_notify

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Message-ID: <1656055326.9754634-1-xuanzhuo@linux.alibaba.com>
Date:   Fri, 24 Jun 2022 15:22:06 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Vadim Pasternak <vadimp@...dia.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Eric Farman <farman@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        linux-um@...ts.infradead.org, netdev@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, bpf@...r.kernel.org,
        kangjie.xu@...ux.alibaba.com
Subject: Re: [PATCH v10 25/41] virtio_pci: struct virtio_pci_common_cfg add queue_notify_data

On Fri, 24 Jun 2022 02:59:39 -0400, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> On Fri, Jun 24, 2022 at 10:56:05AM +0800, Xuan Zhuo wrote:
> > Add queue_notify_data in struct virtio_pci_common_cfg, which comes from
> > here https://github.com/oasis-tcs/virtio-spec/issues/89
> >
> > For not breaks uABI, add a new struct virtio_pci_common_cfg_notify.
>
> What exactly is meant by not breaking uABI?
> Users are supposed to be prepared for struct size to change ... no?

This was a previous discussion with Jason Wang, who was concerned about
affecting some existing programs.

https://lore.kernel.org/all/CACGkMEshTp8vSP9=pKj82y8+DDQFu9tFAk1EGhMZLvXUE-OSEA@mail.gmail.com/

Thanks.

>
>
> > Since I want to add queue_reset after queue_notify_data, I submitted
> > this patch first.
> >
> > Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> > Acked-by: Jason Wang <jasowang@...hat.com>
> > ---
> >  include/uapi/linux/virtio_pci.h | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
> > index 3a86f36d7e3d..22bec9bd0dfc 100644
> > --- a/include/uapi/linux/virtio_pci.h
> > +++ b/include/uapi/linux/virtio_pci.h
> > @@ -166,6 +166,13 @@ struct virtio_pci_common_cfg {
> >  	__le32 queue_used_hi;		/* read-write */
> >  };
> >
> > +struct virtio_pci_common_cfg_notify {
> > +	struct virtio_pci_common_cfg cfg;
> > +
> > +	__le16 queue_notify_data;	/* read-write */
> > +	__le16 padding;
> > +};
> > +
> >  /* Fields in VIRTIO_PCI_CAP_PCI_CFG: */
> >  struct virtio_pci_cfg_cap {
> >  	struct virtio_pci_cap cap;
> > --
> > 2.31.0
>