Jason Wang
2014-Nov-20 09:03 UTC
[PATCH net V5] virtio-net: validate features during probe
We currently trigger BUG when VIRTIO_NET_F_CTRL_VQ is not set but one of features depending on it is. That's not a friendly way to report errors to hypervisors. Let's check, and fail probe instead. Cc: Rusty Russell <rusty at rustcorp.com.au> Cc: Cornelia Huck <cornelia.huck at de.ibm.com> Cc: Wanlong Gao <gaowanlong at cn.fujitsu.com> Signed-off-by: Michael S. Tsirkin <mst at redhat.com> Signed-off-by: Jason Wang <jasowang at redhat.com> --- Changes from V1: - Drop NETIF_F_*_UFO from checklist Changes from V2: - only check the features for ctrl vq (this fix the real bug) - better error message and simplify API Changes from V3: - pass dbit directly and even better error message - typo fix Changes from v4: - add "device" before "advertise" --- drivers/net/virtio_net.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index ec2a8b4..b0bc8ea 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -1673,6 +1673,40 @@ static const struct attribute_group virtio_net_mrg_rx_group = { }; #endif +static bool virtnet_fail_on_feature(struct virtio_device *vdev, + unsigned int fbit, + const char *fname, const char *dname) +{ + if (!virtio_has_feature(vdev, fbit)) + return false; + + dev_err(&vdev->dev, "device advertises feature %s but not %s", + fname, dname); + + return true; +} + +#define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ + virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) + +static bool virtnet_validate_features(struct virtio_device *vdev) +{ + if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && + (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, + "VIRTIO_NET_F_CTRL_VQ") || + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, + "VIRTIO_NET_F_CTRL_VQ") || + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, + "VIRTIO_NET_F_CTRL_VQ") || + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, + "VIRTIO_NET_F_CTRL_VQ"))) { + return false; + } + + return true; +} + static int virtnet_probe(struct virtio_device *vdev) { int i, err; @@ -1680,6 +1714,9 @@ static int virtnet_probe(struct virtio_device *vdev) struct virtnet_info *vi; u16 max_queue_pairs; + if (!virtnet_validate_features(vdev)) + return -EINVAL; + /* Find if host supports multiqueue virtio_net device */ err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, struct virtio_net_config, -- 1.9.1
Cornelia Huck
2014-Nov-20 09:48 UTC
[PATCH net V5] virtio-net: validate features during probe
On Thu, 20 Nov 2014 17:03:05 +0800 Jason Wang <jasowang at redhat.com> wrote:> We currently trigger BUG when VIRTIO_NET_F_CTRL_VQ > is not set but one of features depending on it is. > That's not a friendly way to report errors to > hypervisors. > Let's check, and fail probe instead. > > Cc: Rusty Russell <rusty at rustcorp.com.au> > Cc: Cornelia Huck <cornelia.huck at de.ibm.com> > Cc: Wanlong Gao <gaowanlong at cn.fujitsu.com> > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > Signed-off-by: Jason Wang <jasowang at redhat.com>> +static bool virtnet_validate_features(struct virtio_device *vdev) > +{ > + if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && > + (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, > + "VIRTIO_NET_F_CTRL_VQ") || > + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, > + "VIRTIO_NET_F_CTRL_VQ") || > + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, > + "VIRTIO_NET_F_CTRL_VQ") || > + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || > + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, > + "VIRTIO_NET_F_CTRL_VQ"))) { > + return false; > + } > + > + return true; > +}I still think it may make sense to print all incorrectly set bits, but let's just fix the BUG() trigger for now. Acked-by: Cornelia Huck <cornelia.huck at de.ibm.com>
Jason Wang
2014-Nov-20 09:52 UTC
[PATCH net V5] virtio-net: validate features during probe
On 11/20/2014 05:48 PM, Cornelia Huck wrote:> On Thu, 20 Nov 2014 17:03:05 +0800 > Jason Wang <jasowang at redhat.com> wrote: > >> We currently trigger BUG when VIRTIO_NET_F_CTRL_VQ >> is not set but one of features depending on it is. >> That's not a friendly way to report errors to >> hypervisors. >> Let's check, and fail probe instead. >> >> Cc: Rusty Russell <rusty at rustcorp.com.au> >> Cc: Cornelia Huck <cornelia.huck at de.ibm.com> >> Cc: Wanlong Gao <gaowanlong at cn.fujitsu.com> >> Signed-off-by: Michael S. Tsirkin <mst at redhat.com> >> Signed-off-by: Jason Wang <jasowang at redhat.com> >> +static bool virtnet_validate_features(struct virtio_device *vdev) >> +{ >> + if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && >> + (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, >> + "VIRTIO_NET_F_CTRL_VQ") || >> + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, >> + "VIRTIO_NET_F_CTRL_VQ") || >> + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, >> + "VIRTIO_NET_F_CTRL_VQ") || >> + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || >> + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, >> + "VIRTIO_NET_F_CTRL_VQ"))) { >> + return false; >> + } >> + >> + return true; >> +} > I still think it may make sense to print all incorrectly set bits, but > let's just fix the BUG() trigger for now. > > Acked-by: Cornelia Huck <cornelia.huck at de.ibm.com> >Right, will do it in the future. Thanks
Michael S. Tsirkin
2014-Nov-20 12:44 UTC
[PATCH net V5] virtio-net: validate features during probe
On Thu, Nov 20, 2014 at 05:03:05PM +0800, Jason Wang wrote:> We currently trigger BUG when VIRTIO_NET_F_CTRL_VQ > is not set but one of features depending on it is. > That's not a friendly way to report errors to > hypervisors. > Let's check, and fail probe instead. > > Cc: Rusty Russell <rusty at rustcorp.com.au> > Cc: Cornelia Huck <cornelia.huck at de.ibm.com> > Cc: Wanlong Gao <gaowanlong at cn.fujitsu.com> > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > Signed-off-by: Jason Wang <jasowang at redhat.com>Acked-by: Michael S. Tsirkin <mst at redhat.com> Cc DaveM to pick up the patch.> --- > Changes from V1: > - Drop NETIF_F_*_UFO from checklist > Changes from V2: > - only check the features for ctrl vq (this fix the real bug) > - better error message and simplify API > Changes from V3: > - pass dbit directly and even better error message > - typo fix > Changes from v4: > - add "device" before "advertise" > --- > drivers/net/virtio_net.c | 37 +++++++++++++++++++++++++++++++++++++ > 1 file changed, 37 insertions(+) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index ec2a8b4..b0bc8ea 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -1673,6 +1673,40 @@ static const struct attribute_group virtio_net_mrg_rx_group = { > }; > #endif > > +static bool virtnet_fail_on_feature(struct virtio_device *vdev, > + unsigned int fbit, > + const char *fname, const char *dname) > +{ > + if (!virtio_has_feature(vdev, fbit)) > + return false; > + > + dev_err(&vdev->dev, "device advertises feature %s but not %s", > + fname, dname); > + > + return true; > +} > + > +#define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ > + virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) > + > +static bool virtnet_validate_features(struct virtio_device *vdev) > +{ > + if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && > + (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, > + "VIRTIO_NET_F_CTRL_VQ") || > + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, > + "VIRTIO_NET_F_CTRL_VQ") || > + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, > + "VIRTIO_NET_F_CTRL_VQ") || > + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || > + VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, > + "VIRTIO_NET_F_CTRL_VQ"))) { > + return false; > + } > + > + return true; > +} > + > static int virtnet_probe(struct virtio_device *vdev) > { > int i, err; > @@ -1680,6 +1714,9 @@ static int virtnet_probe(struct virtio_device *vdev) > struct virtnet_info *vi; > u16 max_queue_pairs; > > + if (!virtnet_validate_features(vdev)) > + return -EINVAL; > + > /* Find if host supports multiqueue virtio_net device */ > err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, > struct virtio_net_config, > -- > 1.9.1
David Miller
2014-Nov-21 05:27 UTC
[PATCH net V5] virtio-net: validate features during probe
From: Jason Wang <jasowang at redhat.com> Date: Thu, 20 Nov 2014 17:03:05 +0800> We currently trigger BUG when VIRTIO_NET_F_CTRL_VQ > is not set but one of features depending on it is. > That's not a friendly way to report errors to > hypervisors. > Let's check, and fail probe instead. > > Cc: Rusty Russell <rusty at rustcorp.com.au> > Cc: Cornelia Huck <cornelia.huck at de.ibm.com> > Cc: Wanlong Gao <gaowanlong at cn.fujitsu.com> > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > Signed-off-by: Jason Wang <jasowang at redhat.com>Applied, thanks.
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