On Tue, Sep 20, 2022 at 1:46 PM Zhu, Lingshan <lingshan.zhu@xxxxxxxxx> wrote:
>
>
>
> On 9/20/2022 10:16 AM, Jason Wang wrote:
> > On Fri, Sep 9, 2022 at 5:05 PM Zhu Lingshan <lingshan.zhu@xxxxxxxxx> wrote:
> >> vdpa_dev_net_config_fill() should only report driver features
> >> to userspace after features negotiation is done.
> >>
> >> Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
> >> ---
> >> drivers/vdpa/vdpa.c | 13 +++++++++----
> >> 1 file changed, 9 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> >> index 798a02c7aa94..29d7e8858e6f 100644
> >> --- a/drivers/vdpa/vdpa.c
> >> +++ b/drivers/vdpa/vdpa.c
> >> @@ -819,6 +819,7 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
> >> struct virtio_net_config config = {};
> >> u64 features_device, features_driver;
> >> u16 val_u16;
> >> + u8 status;
> >>
> >> vdev->config->get_config(vdev, 0, &config, sizeof(config));
> >>
> >> @@ -834,10 +835,14 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
> >> if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
> >> return -EMSGSIZE;
> >>
> >> - features_driver = vdev->config->get_driver_features(vdev);
> >> - if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver,
> >> - VDPA_ATTR_PAD))
> >> - return -EMSGSIZE;
> >> + /* only read driver features after the feature negotiation is done */
> >> + status = vdev->config->get_status(vdev);
> >> + if (status & VIRTIO_CONFIG_S_FEATURES_OK) {
> > Any reason this is not checked in its caller as what it used to do before?
> will check the existence of vdev->config->get_status before calling it in V2
Just to clarify, I meant to check FEAUTRES_OK in the caller -
vdpa_dev_config_fill() otherwise each type needs to repeat this in
their specific codes.
Thanks
>
> Thanks,
> Zhu Lingshan
> >
> > Thanks
> >
> >> + features_driver = vdev->config->get_driver_features(vdev);
> >> + if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver,
> >> + VDPA_ATTR_PAD))
> >> + return -EMSGSIZE;
> >> + }
> >>
> >> features_device = vdev->config->get_device_features(vdev);
> >>
> >> --
> >> 2.31.1
> >>
>
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