* [PATCH] vdpa: Consider device id larger than 31
@ 2021-11-25 18:09 Parav Pandit via Virtualization
2021-11-26 2:48 ` Jason Wang
0 siblings, 1 reply; 5+ messages in thread
From: Parav Pandit via Virtualization @ 2021-11-25 18:09 UTC (permalink / raw)
To: virtualization, mst, jasowang
Cc: kbuild-all, lkp, kbuild, linux-kernel, edumazet, elic,
Dan Carpenter
virtio device id value can be more than 31. Hence, use BIT_ULL in
assignment.
Fixes: 33b347503f01 ("vdpa: Define vdpa mgmt device, ops and a netlink interface")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Parav Pandit <parav@nvidia.com>
---
drivers/vdpa/vdpa.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 7332a74a4b00..e91c71aeeddf 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -404,7 +404,7 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
goto msg_err;
while (mdev->id_table[i].device) {
- supported_classes |= BIT(mdev->id_table[i].device);
+ supported_classes |= BIT_ULL(mdev->id_table[i].device);
i++;
}
--
2.26.2
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^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] vdpa: Consider device id larger than 31
2021-11-25 18:09 [PATCH] vdpa: Consider device id larger than 31 Parav Pandit via Virtualization
@ 2021-11-26 2:48 ` Jason Wang
[not found] ` <20211128071435.GB99190@mtl-vdi-166.wap.labs.mlnx>
0 siblings, 1 reply; 5+ messages in thread
From: Jason Wang @ 2021-11-26 2:48 UTC (permalink / raw)
To: Parav Pandit
Cc: kbuild-all, kernel test robot, mst, kbuild, linux-kernel,
virtualization, Eric Dumazet, Eli Cohen, Dan Carpenter
On Fri, Nov 26, 2021 at 2:09 AM Parav Pandit <parav@nvidia.com> wrote:
>
> virtio device id value can be more than 31. Hence, use BIT_ULL in
> assignment.
>
> Fixes: 33b347503f01 ("vdpa: Define vdpa mgmt device, ops and a netlink interface")
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Parav Pandit <parav@nvidia.com>
Acked-by: Jason Wang <jasowang@redhat.com>
> ---
> drivers/vdpa/vdpa.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 7332a74a4b00..e91c71aeeddf 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -404,7 +404,7 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
> goto msg_err;
>
> while (mdev->id_table[i].device) {
> - supported_classes |= BIT(mdev->id_table[i].device);
> + supported_classes |= BIT_ULL(mdev->id_table[i].device);
> i++;
> }
>
> --
> 2.26.2
>
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] vdpa: Consider device id larger than 31
[not found] ` <20211128071435.GB99190@mtl-vdi-166.wap.labs.mlnx>
@ 2021-11-28 7:45 ` Michael S. Tsirkin
2021-11-29 6:58 ` Dan Carpenter
1 sibling, 0 replies; 5+ messages in thread
From: Michael S. Tsirkin @ 2021-11-28 7:45 UTC (permalink / raw)
To: Eli Cohen
Cc: kbuild-all, kernel test robot, linux-kernel, virtualization,
Eric Dumazet, kbuild, Dan Carpenter
On Sun, Nov 28, 2021 at 09:14:35AM +0200, Eli Cohen wrote:
> On Fri, Nov 26, 2021 at 10:48:12AM +0800, Jason Wang wrote:
> > On Fri, Nov 26, 2021 at 2:09 AM Parav Pandit <parav@nvidia.com> wrote:
> > >
> > > virtio device id value can be more than 31. Hence, use BIT_ULL in
> > > assignment.
> > >
> > > Fixes: 33b347503f01 ("vdpa: Define vdpa mgmt device, ops and a netlink interface")
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> > > Signed-off-by: Parav Pandit <parav@nvidia.com>
> >
> > Acked-by: Jason Wang <jasowang@redhat.com>
> >
> > > ---
> > > drivers/vdpa/vdpa.c | 2 +-
> > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> > > index 7332a74a4b00..e91c71aeeddf 100644
> > > --- a/drivers/vdpa/vdpa.c
> > > +++ b/drivers/vdpa/vdpa.c
> > > @@ -404,7 +404,7 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
> > > goto msg_err;
> > >
> > > while (mdev->id_table[i].device) {
> > > - supported_classes |= BIT(mdev->id_table[i].device);
> > > + supported_classes |= BIT_ULL(mdev->id_table[i].device);
> > > i++;
> > > }
> > >
>
> type of mdev->id_table[i].device is __u32 so in theory you're limited
> to device ID's up to 63.
> Maybe add assert here?
I think 1 << 63 is illegal though.
> > > --
> > > 2.26.2
> > >
> >
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] vdpa: Consider device id larger than 31
[not found] ` <20211128071435.GB99190@mtl-vdi-166.wap.labs.mlnx>
2021-11-28 7:45 ` Michael S. Tsirkin
@ 2021-11-29 6:58 ` Dan Carpenter
2021-11-29 7:22 ` Parav Pandit via Virtualization
1 sibling, 1 reply; 5+ messages in thread
From: Dan Carpenter @ 2021-11-29 6:58 UTC (permalink / raw)
To: Eli Cohen
Cc: kbuild-all, kernel test robot, mst, linux-kernel, virtualization,
Eric Dumazet, kbuild
On Sun, Nov 28, 2021 at 09:14:35AM +0200, Eli Cohen wrote:
> On Fri, Nov 26, 2021 at 10:48:12AM +0800, Jason Wang wrote:
> > On Fri, Nov 26, 2021 at 2:09 AM Parav Pandit <parav@nvidia.com> wrote:
> > >
> > > virtio device id value can be more than 31. Hence, use BIT_ULL in
> > > assignment.
> > >
> > > Fixes: 33b347503f01 ("vdpa: Define vdpa mgmt device, ops and a netlink interface")
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> > > Signed-off-by: Parav Pandit <parav@nvidia.com>
> >
> > Acked-by: Jason Wang <jasowang@redhat.com>
> >
> > > ---
> > > drivers/vdpa/vdpa.c | 2 +-
> > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> > > index 7332a74a4b00..e91c71aeeddf 100644
> > > --- a/drivers/vdpa/vdpa.c
> > > +++ b/drivers/vdpa/vdpa.c
> > > @@ -404,7 +404,7 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
> > > goto msg_err;
> > >
> > > while (mdev->id_table[i].device) {
> > > - supported_classes |= BIT(mdev->id_table[i].device);
> > > + supported_classes |= BIT_ULL(mdev->id_table[i].device);
> > > i++;
> > > }
> > >
>
> type of mdev->id_table[i].device is __u32 so in theory you're limited
> to device ID's up to 63.
A u32 can fit numbers up to 4 million? These .device numbers are
normally hardcoded defines listed in usr/include/linux/virtio_ids.h
But sometimes they're not like in vp_modern_probe() which does:
mdev->id.device = pci_dev->device - 0x1040;
I don't know if an assert is really worth it, considering how almost all
of them are hardcoded. Also if we do want an assert maybe there is a
better place to put it?
regards,
dan carpenter
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^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: [PATCH] vdpa: Consider device id larger than 31
2021-11-29 6:58 ` Dan Carpenter
@ 2021-11-29 7:22 ` Parav Pandit via Virtualization
0 siblings, 0 replies; 5+ messages in thread
From: Parav Pandit via Virtualization @ 2021-11-29 7:22 UTC (permalink / raw)
To: Dan Carpenter, Eli Cohen
Cc: kbuild-all@lists.01.org, kernel test robot, mst, linux-kernel,
virtualization, Eric Dumazet, kbuild@lists.01.org
> From: Dan Carpenter <dan.carpenter@oracle.com>
> Sent: Monday, November 29, 2021 12:29 PM
>
> On Sun, Nov 28, 2021 at 09:14:35AM +0200, Eli Cohen wrote:
> > On Fri, Nov 26, 2021 at 10:48:12AM +0800, Jason Wang wrote:
> > > On Fri, Nov 26, 2021 at 2:09 AM Parav Pandit <parav@nvidia.com> wrote:
> > > >
> > > > virtio device id value can be more than 31. Hence, use BIT_ULL in
> > > > assignment.
> > > >
> > > > Fixes: 33b347503f01 ("vdpa: Define vdpa mgmt device, ops and a
> > > > netlink interface")
> > > > Reported-by: kernel test robot <lkp@intel.com>
> > > > Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> > > > Signed-off-by: Parav Pandit <parav@nvidia.com>
> > >
> > > Acked-by: Jason Wang <jasowang@redhat.com>
> > >
> > > > ---
> > > > drivers/vdpa/vdpa.c | 2 +-
> > > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index
> > > > 7332a74a4b00..e91c71aeeddf 100644
> > > > --- a/drivers/vdpa/vdpa.c
> > > > +++ b/drivers/vdpa/vdpa.c
> > > > @@ -404,7 +404,7 @@ static int vdpa_mgmtdev_fill(const struct
> vdpa_mgmt_dev *mdev, struct sk_buff *m
> > > > goto msg_err;
> > > >
> > > > while (mdev->id_table[i].device) {
> > > > - supported_classes |= BIT(mdev->id_table[i].device);
> > > > + supported_classes |=
> > > > + BIT_ULL(mdev->id_table[i].device);
> > > > i++;
> > > > }
> > > >
> >
> > type of mdev->id_table[i].device is __u32 so in theory you're limited
> > to device ID's up to 63.
>
> A u32 can fit numbers up to 4 million? These .device numbers are normally
> hardcoded defines listed in usr/include/linux/virtio_ids.h
>
> But sometimes they're not like in vp_modern_probe() which does:
>
> mdev->id.device = pci_dev->device - 0x1040;
>
> I don't know if an assert is really worth it, considering how almost all of them
> are hardcoded. Also if we do want an assert maybe there is a better place to
> put it?
I am changing above fix to report device id only upto 63.
Others higher values (which are not part of the current spec) will be ignored.
There is no need for assert for any undefined value anyway.
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end of thread, other threads:[~2021-11-29 7:22 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2021-11-25 18:09 [PATCH] vdpa: Consider device id larger than 31 Parav Pandit via Virtualization
2021-11-26 2:48 ` Jason Wang
[not found] ` <20211128071435.GB99190@mtl-vdi-166.wap.labs.mlnx>
2021-11-28 7:45 ` Michael S. Tsirkin
2021-11-29 6:58 ` Dan Carpenter
2021-11-29 7:22 ` Parav Pandit via Virtualization
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