Added TUNGETSUPPORTEDOFFLOADS that should allow
to get bits of supported offloads.
Added 2 additional offlloads for USO(IPv4 & IPv6).
Separate offloads are required for Windows VM guests,
g.e. Windows may set USO rx only for IPv4.
Signed-off-by: Andrew Melnychenko <[email protected]>
---
include/uapi/linux/if_tun.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
index 454ae31b93c7..07680fae6e18 100644
--- a/include/uapi/linux/if_tun.h
+++ b/include/uapi/linux/if_tun.h
@@ -61,6 +61,7 @@
#define TUNSETFILTEREBPF _IOR('T', 225, int)
#define TUNSETCARRIER _IOW('T', 226, int)
#define TUNGETDEVNETNS _IO('T', 227)
+#define TUNGETSUPPORTEDOFFLOADS _IOR('T', 228, unsigned int)
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001
@@ -88,6 +89,8 @@
#define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
#define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
#define TUN_F_UFO 0x10 /* I can handle UFO packets */
+#define TUN_F_USO4 0x20 /* I can handle USO for IPv4 packets */
+#define TUN_F_USO6 0x40 /* I can handle USO for IPv6 packets */
/* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
#define TUN_PKT_STRIP 0x0001
--
2.34.1
在 2022/1/25 下午4:46, Andrew Melnychenko 写道:
> Added TUNGETSUPPORTEDOFFLOADS that should allow
> to get bits of supported offloads.
So we don't use dedicated ioctls in the past, instead, we just probing
by checking the return value of TUNSETOFFLOADS.
E.g qemu has the following codes:
int tap_probe_has_ufo(int fd)
{
unsigned offload;
offload = TUN_F_CSUM | TUN_F_UFO;
if (ioctl(fd, TUNSETOFFLOAD, offload) < 0)
return 0;
return 1;
}
Any reason we can't keep using that?
Thanks
> Added 2 additional offlloads for USO(IPv4 & IPv6).
> Separate offloads are required for Windows VM guests,
> g.e. Windows may set USO rx only for IPv4.
>
> Signed-off-by: Andrew Melnychenko <[email protected]>
> ---
> include/uapi/linux/if_tun.h | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
> index 454ae31b93c7..07680fae6e18 100644
> --- a/include/uapi/linux/if_tun.h
> +++ b/include/uapi/linux/if_tun.h
> @@ -61,6 +61,7 @@
> #define TUNSETFILTEREBPF _IOR('T', 225, int)
> #define TUNSETCARRIER _IOW('T', 226, int)
> #define TUNGETDEVNETNS _IO('T', 227)
> +#define TUNGETSUPPORTEDOFFLOADS _IOR('T', 228, unsigned int)
>
> /* TUNSETIFF ifr flags */
> #define IFF_TUN 0x0001
> @@ -88,6 +89,8 @@
> #define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
> #define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
> #define TUN_F_UFO 0x10 /* I can handle UFO packets */
> +#define TUN_F_USO4 0x20 /* I can handle USO for IPv4 packets */
> +#define TUN_F_USO6 0x40 /* I can handle USO for IPv6 packets */
>
> /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
> #define TUN_PKT_STRIP 0x0001
Hi all,
On Wed, Feb 9, 2022 at 6:26 AM Jason Wang <[email protected]> wrote:
>
>
> 在 2022/1/25 下午4:46, Andrew Melnychenko 写道:
> > Added TUNGETSUPPORTEDOFFLOADS that should allow
> > to get bits of supported offloads.
>
>
> So we don't use dedicated ioctls in the past, instead, we just probing
> by checking the return value of TUNSETOFFLOADS.
>
> E.g qemu has the following codes:
>
> int tap_probe_has_ufo(int fd)
> {
> unsigned offload;
>
> offload = TUN_F_CSUM | TUN_F_UFO;
>
> if (ioctl(fd, TUNSETOFFLOAD, offload) < 0)
> return 0;
>
> return 1;
> }
>
> Any reason we can't keep using that?
>
> Thanks
>
Well, even in this example. To check the ufo feature, we trying to set it.
What if we don't need to "enable" UFO and/or do not change its state?
I think it's a good idea to have the ability to get supported offloads
without changing device behavior.
>
> > Added 2 additional offlloads for USO(IPv4 & IPv6).
> > Separate offloads are required for Windows VM guests,
> > g.e. Windows may set USO rx only for IPv4.
> >
> > Signed-off-by: Andrew Melnychenko <[email protected]>
> > ---
> > include/uapi/linux/if_tun.h | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
> > index 454ae31b93c7..07680fae6e18 100644
> > --- a/include/uapi/linux/if_tun.h
> > +++ b/include/uapi/linux/if_tun.h
> > @@ -61,6 +61,7 @@
> > #define TUNSETFILTEREBPF _IOR('T', 225, int)
> > #define TUNSETCARRIER _IOW('T', 226, int)
> > #define TUNGETDEVNETNS _IO('T', 227)
> > +#define TUNGETSUPPORTEDOFFLOADS _IOR('T', 228, unsigned int)
> >
> > /* TUNSETIFF ifr flags */
> > #define IFF_TUN 0x0001
> > @@ -88,6 +89,8 @@
> > #define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
> > #define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
> > #define TUN_F_UFO 0x10 /* I can handle UFO packets */
> > +#define TUN_F_USO4 0x20 /* I can handle USO for IPv4 packets */
> > +#define TUN_F_USO6 0x40 /* I can handle USO for IPv6 packets */
> >
> > /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
> > #define TUN_PKT_STRIP 0x0001
>
Hi Jason,
We agree that the same can be done also using the old way, i.e. try to
set specific offload - if failed, probably it is not supported.
We think this is a little not scalable and we suggest adding the ioctl
that will allow us to query allo the supported features in a single
call.
We think this will make QEMU code more simple also in future.
Do I understand correctly that you suggest to skip this new ioctl and
use the old way of query for this (USO) feature and all future
extensions?
Thanks
On Wed, Feb 23, 2022 at 5:53 AM Jason Wang <[email protected]> wrote:
>
> On Tue, Feb 22, 2022 at 9:28 PM Andrew Melnichenko <[email protected]> wrote:
> >
> > Hi all,
> >
> > On Wed, Feb 9, 2022 at 6:26 AM Jason Wang <[email protected]> wrote:
> > >
> > >
> > > 在 2022/1/25 下午4:46, Andrew Melnychenko 写道:
> > > > Added TUNGETSUPPORTEDOFFLOADS that should allow
> > > > to get bits of supported offloads.
> > >
> > >
> > > So we don't use dedicated ioctls in the past, instead, we just probing
> > > by checking the return value of TUNSETOFFLOADS.
> > >
> > > E.g qemu has the following codes:
> > >
> > > int tap_probe_has_ufo(int fd)
> > > {
> > > unsigned offload;
> > >
> > > offload = TUN_F_CSUM | TUN_F_UFO;
> > >
> > > if (ioctl(fd, TUNSETOFFLOAD, offload) < 0)
> > > return 0;
> > >
> > > return 1;
> > > }
> > >
> > > Any reason we can't keep using that?
> > >
> > > Thanks
> > >
> >
> > Well, even in this example. To check the ufo feature, we trying to set it.
> > What if we don't need to "enable" UFO and/or do not change its state?
>
> So at least Qemu doesn't have such a requirement since during the
> probe the virtual networking backend is not even started.
>
> > I think it's a good idea to have the ability to get supported offloads
> > without changing device behavior.
>
> Do you see a real user for this?
>
> Btw, we still need to probe this new ioctl anyway.
>
> Thanks
>
> >
> > >
> > > > Added 2 additional offlloads for USO(IPv4 & IPv6).
> > > > Separate offloads are required for Windows VM guests,
> > > > g.e. Windows may set USO rx only for IPv4.
> > > >
> > > > Signed-off-by: Andrew Melnychenko <[email protected]>
> > > > ---
> > > > include/uapi/linux/if_tun.h | 3 +++
> > > > 1 file changed, 3 insertions(+)
> > > >
> > > > diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
> > > > index 454ae31b93c7..07680fae6e18 100644
> > > > --- a/include/uapi/linux/if_tun.h
> > > > +++ b/include/uapi/linux/if_tun.h
> > > > @@ -61,6 +61,7 @@
> > > > #define TUNSETFILTEREBPF _IOR('T', 225, int)
> > > > #define TUNSETCARRIER _IOW('T', 226, int)
> > > > #define TUNGETDEVNETNS _IO('T', 227)
> > > > +#define TUNGETSUPPORTEDOFFLOADS _IOR('T', 228, unsigned int)
> > > >
> > > > /* TUNSETIFF ifr flags */
> > > > #define IFF_TUN 0x0001
> > > > @@ -88,6 +89,8 @@
> > > > #define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
> > > > #define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
> > > > #define TUN_F_UFO 0x10 /* I can handle UFO packets */
> > > > +#define TUN_F_USO4 0x20 /* I can handle USO for IPv4 packets */
> > > > +#define TUN_F_USO6 0x40 /* I can handle USO for IPv6 packets */
> > > >
> > > > /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
> > > > #define TUN_PKT_STRIP 0x0001
> > >
> >
>
On Tue, Feb 22, 2022 at 9:28 PM Andrew Melnichenko <[email protected]> wrote:
>
> Hi all,
>
> On Wed, Feb 9, 2022 at 6:26 AM Jason Wang <[email protected]> wrote:
> >
> >
> > 在 2022/1/25 下午4:46, Andrew Melnychenko 写道:
> > > Added TUNGETSUPPORTEDOFFLOADS that should allow
> > > to get bits of supported offloads.
> >
> >
> > So we don't use dedicated ioctls in the past, instead, we just probing
> > by checking the return value of TUNSETOFFLOADS.
> >
> > E.g qemu has the following codes:
> >
> > int tap_probe_has_ufo(int fd)
> > {
> > unsigned offload;
> >
> > offload = TUN_F_CSUM | TUN_F_UFO;
> >
> > if (ioctl(fd, TUNSETOFFLOAD, offload) < 0)
> > return 0;
> >
> > return 1;
> > }
> >
> > Any reason we can't keep using that?
> >
> > Thanks
> >
>
> Well, even in this example. To check the ufo feature, we trying to set it.
> What if we don't need to "enable" UFO and/or do not change its state?
So at least Qemu doesn't have such a requirement since during the
probe the virtual networking backend is not even started.
> I think it's a good idea to have the ability to get supported offloads
> without changing device behavior.
Do you see a real user for this?
Btw, we still need to probe this new ioctl anyway.
Thanks
>
> >
> > > Added 2 additional offlloads for USO(IPv4 & IPv6).
> > > Separate offloads are required for Windows VM guests,
> > > g.e. Windows may set USO rx only for IPv4.
> > >
> > > Signed-off-by: Andrew Melnychenko <[email protected]>
> > > ---
> > > include/uapi/linux/if_tun.h | 3 +++
> > > 1 file changed, 3 insertions(+)
> > >
> > > diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
> > > index 454ae31b93c7..07680fae6e18 100644
> > > --- a/include/uapi/linux/if_tun.h
> > > +++ b/include/uapi/linux/if_tun.h
> > > @@ -61,6 +61,7 @@
> > > #define TUNSETFILTEREBPF _IOR('T', 225, int)
> > > #define TUNSETCARRIER _IOW('T', 226, int)
> > > #define TUNGETDEVNETNS _IO('T', 227)
> > > +#define TUNGETSUPPORTEDOFFLOADS _IOR('T', 228, unsigned int)
> > >
> > > /* TUNSETIFF ifr flags */
> > > #define IFF_TUN 0x0001
> > > @@ -88,6 +89,8 @@
> > > #define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
> > > #define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
> > > #define TUN_F_UFO 0x10 /* I can handle UFO packets */
> > > +#define TUN_F_USO4 0x20 /* I can handle USO for IPv4 packets */
> > > +#define TUN_F_USO6 0x40 /* I can handle USO for IPv6 packets */
> > >
> > > /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
> > > #define TUN_PKT_STRIP 0x0001
> >
>
On Wed, Feb 23, 2022 at 9:31 PM Yuri Benditovich
<[email protected]> wrote:
>
> Hi Jason,
> We agree that the same can be done also using the old way, i.e. try to
> set specific offload - if failed, probably it is not supported.
> We think this is a little not scalable and we suggest adding the ioctl
> that will allow us to query allo the supported features in a single
> call.
Possibly but then you need some kind of probing. E.g we need endup
with probing TUNGETSUPPORTEDOFFLOADS iotctl itself.
> We think this will make QEMU code more simple also in future.
We can discuss this when qemu patches were sent.
> Do I understand correctly that you suggest to skip this new ioctl and
> use the old way of query for this (USO) feature and all future
> extensions?
Yes, since it's not a must. And we can do the TUNGETSUPPORTEDOFFLOADS
in a separate series.
Thanks
>
> Thanks
>
>
> On Wed, Feb 23, 2022 at 5:53 AM Jason Wang <[email protected]> wrote:
> >
> > On Tue, Feb 22, 2022 at 9:28 PM Andrew Melnichenko <[email protected]> wrote:
> > >
> > > Hi all,
> > >
> > > On Wed, Feb 9, 2022 at 6:26 AM Jason Wang <[email protected]> wrote:
> > > >
> > > >
> > > > 在 2022/1/25 下午4:46, Andrew Melnychenko 写道:
> > > > > Added TUNGETSUPPORTEDOFFLOADS that should allow
> > > > > to get bits of supported offloads.
> > > >
> > > >
> > > > So we don't use dedicated ioctls in the past, instead, we just probing
> > > > by checking the return value of TUNSETOFFLOADS.
> > > >
> > > > E.g qemu has the following codes:
> > > >
> > > > int tap_probe_has_ufo(int fd)
> > > > {
> > > > unsigned offload;
> > > >
> > > > offload = TUN_F_CSUM | TUN_F_UFO;
> > > >
> > > > if (ioctl(fd, TUNSETOFFLOAD, offload) < 0)
> > > > return 0;
> > > >
> > > > return 1;
> > > > }
> > > >
> > > > Any reason we can't keep using that?
> > > >
> > > > Thanks
> > > >
> > >
> > > Well, even in this example. To check the ufo feature, we trying to set it.
> > > What if we don't need to "enable" UFO and/or do not change its state?
> >
> > So at least Qemu doesn't have such a requirement since during the
> > probe the virtual networking backend is not even started.
> >
> > > I think it's a good idea to have the ability to get supported offloads
> > > without changing device behavior.
> >
> > Do you see a real user for this?
> >
> > Btw, we still need to probe this new ioctl anyway.
> >
> > Thanks
> >
> > >
> > > >
> > > > > Added 2 additional offlloads for USO(IPv4 & IPv6).
> > > > > Separate offloads are required for Windows VM guests,
> > > > > g.e. Windows may set USO rx only for IPv4.
> > > > >
> > > > > Signed-off-by: Andrew Melnychenko <[email protected]>
> > > > > ---
> > > > > include/uapi/linux/if_tun.h | 3 +++
> > > > > 1 file changed, 3 insertions(+)
> > > > >
> > > > > diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
> > > > > index 454ae31b93c7..07680fae6e18 100644
> > > > > --- a/include/uapi/linux/if_tun.h
> > > > > +++ b/include/uapi/linux/if_tun.h
> > > > > @@ -61,6 +61,7 @@
> > > > > #define TUNSETFILTEREBPF _IOR('T', 225, int)
> > > > > #define TUNSETCARRIER _IOW('T', 226, int)
> > > > > #define TUNGETDEVNETNS _IO('T', 227)
> > > > > +#define TUNGETSUPPORTEDOFFLOADS _IOR('T', 228, unsigned int)
> > > > >
> > > > > /* TUNSETIFF ifr flags */
> > > > > #define IFF_TUN 0x0001
> > > > > @@ -88,6 +89,8 @@
> > > > > #define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
> > > > > #define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
> > > > > #define TUN_F_UFO 0x10 /* I can handle UFO packets */
> > > > > +#define TUN_F_USO4 0x20 /* I can handle USO for IPv4 packets */
> > > > > +#define TUN_F_USO6 0x40 /* I can handle USO for IPv6 packets */
> > > > >
> > > > > /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
> > > > > #define TUN_PKT_STRIP 0x0001
> > > >
> > >
> >
>