From: Jason Wang <jasowang@redhat.com>
To: Eli Cohen <elic@nvidia.com>
Cc: "Hemminger, Stephen" <stephen@networkplumber.org>,
netdev <netdev@vger.kernel.org>,
Si-Wei Liu <si-wei.liu@oracle.com>,
Jianbo Liu <jianbol@nvidia.com>, Gautam Dawar <gdawar@xilinx.com>
Subject: Re: [PATCH 2/3] virtio: Define bit numbers for device independent features
Date: Thu, 17 Feb 2022 14:06:39 +0800 [thread overview]
Message-ID: <CACGkMEvNoG89M0m_=Z9E-d2U0tPJ2_-eiEEj3s_FGYOKTbkH0w@mail.gmail.com> (raw)
In-Reply-To: <20220216071553.GB2109@mtl-vdi-166.wap.labs.mlnx>
On Wed, Feb 16, 2022 at 3:16 PM Eli Cohen <elic@nvidia.com> wrote:
>
> On Mon, Feb 14, 2022 at 02:06:54PM +0800, Jason Wang wrote:
> >
> > 在 2022/2/10 下午5:27, Eli Cohen 写道:
> > > On Thu, Feb 10, 2022 at 04:35:28PM +0800, Jason Wang wrote:
> > > > On Thu, Feb 10, 2022 at 4:31 PM Eli Cohen <elic@nvidia.com> wrote:
> > > > > On Thu, Feb 10, 2022 at 03:54:57PM +0800, Jason Wang wrote:
> > > > > > On Mon, Feb 7, 2022 at 8:56 PM Eli Cohen <elic@nvidia.com> wrote:
> > > > > > > Define bit fields for device independent feature bits. We need them in a
> > > > > > > follow up patch.
> > > > > > >
> > > > > > > Also, define macros for start and end of these feature bits.
> > > > > > >
> > > > > > > Reviewed-by: Jianbo Liu <jianbol@nvidia.com>
> > > > > > > Signed-off-by: Eli Cohen <elic@nvidia.com>
> > > > > > > ---
> > > > > > > include/uapi/linux/virtio_config.h | 16 ++++++++--------
> > > > > > > 1 file changed, 8 insertions(+), 8 deletions(-)
> > > > > > >
> > > > > > > diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
> > > > > > > index 3bf6c8bf8477..6d92cc31a8d3 100644
> > > > > > > --- a/include/uapi/linux/virtio_config.h
> > > > > > > +++ b/include/uapi/linux/virtio_config.h
> > > > > > > @@ -45,14 +45,14 @@
> > > > > > > /* We've given up on this device. */
> > > > > > > #define VIRTIO_CONFIG_S_FAILED 0x80
> > > > > > >
> > > > > > > -/*
> > > > > > > - * Virtio feature bits VIRTIO_TRANSPORT_F_START through
> > > > > > > - * VIRTIO_TRANSPORT_F_END are reserved for the transport
> > > > > > > - * being used (e.g. virtio_ring, virtio_pci etc.), the
> > > > > > > - * rest are per-device feature bits.
> > > > > > > - */
> > > > > > > -#define VIRTIO_TRANSPORT_F_START 28
> > > > > > > -#define VIRTIO_TRANSPORT_F_END 38
> > > > > > > +/* Device independent features per virtio spec 1.1 range from 28 to 38 */
> > > > > > > +#define VIRTIO_DEV_INDEPENDENT_F_START 28
> > > > > > > +#define VIRTIO_DEV_INDEPENDENT_F_END 38
> > > > > > Haven't gone through patch 3 but I think it's probably better not
> > > > > > touch uapi stuff. Or we can define those macros in other place?
> > > > > >
> > > > > I can put it in vdpa.c
> > > > >
> > > > > > > +
> > > > > > > +#define VIRTIO_F_RING_INDIRECT_DESC 28
> > > > > > > +#define VIRTIO_F_RING_EVENT_IDX 29
> > > > > > > +#define VIRTIO_F_IN_ORDER 35
> > > > > > > +#define VIRTIO_F_NOTIFICATION_DATA 38
> > > > > > This part belongs to the virtio_ring.h any reason not pull that file
> > > > > > instead of squashing those into virtio_config.h?
> > > > > >
> > > > > Not sure what you mean here. I can't find virtio_ring.h in my tree.
> > > > I meant just copy the virtio_ring.h in the linux tree. It seems cleaner.
> > > I will still miss VIRTIO_F_ORDER_PLATFORM and VIRTIO_F_NOTIFICATION_DATA
> > > which are only defined in drivers/net/ethernet/sfc/mcdi_pcol.h for block
> > > devices only.
> > >
> > > What would you suggest to do with them? Maybe define them in vdpa.c?
> >
> >
> > I meant maybe we need a full synchronization from the current Linux uapi
> > headers for virtio_config.h and and add virtio_ring.h here.
> >
>
> virtio_config.h is updatd already and virtio_ring.h does not add any
> flag definition that we're missing.
>
> The flags I was missing are
> +#define VIRTIO_F_IN_ORDER 35
> +#define VIRTIO_F_NOTIFICATION_DATA 38
Right, so Gautam posted a path for _F_IN_ORDER [1].
We probably need another patch for NOTIFICATION_DATA.
>
> and both of these do not appear in the linux headers. They appear as
> block specific flags:
>
> drivers/net/ethernet/sfc/mcdi_pcol.h:21471:#define VIRTIO_BLK_CONFIG_VIRTIO_F_IN_ORDER_LBN 35
> drivers/net/ethernet/sfc/mcdi_pcol.h:21480:#define VIRTIO_BLK_CONFIG_VIRTIO_F_NOTIFICATION_DATA_LBN 38
>
> So I just defined these two in vdpa.c (in patch v1).
Fine, but we need to remove them if we get update from linux kernel uapi headers
[1] https://lkml.org/lkml/2022/2/15/43
Thanks
>
> > Thanks
> >
> >
> > >
> > > > Thanks
> > > >
> > > > > > Thanks
> > > > > >
> > > > > > > #ifndef VIRTIO_CONFIG_NO_LEGACY
> > > > > > > /* Do we get callbacks when the ring is completely used, even if we've
> > > > > > > --
> > > > > > > 2.34.1
> > > > > > >
> >
>
next prev parent reply other threads:[~2022-02-17 6:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-07 12:55 [PATCH 0/3] vdpa tool support for configuring max VQs Eli Cohen
2022-02-07 12:55 ` [PATCH 1/3] vdpa: Remove unsupported command line option Eli Cohen
2022-02-10 7:50 ` Jason Wang
2022-02-07 12:55 ` [PATCH 2/3] virtio: Define bit numbers for device independent features Eli Cohen
2022-02-10 7:54 ` Jason Wang
2022-02-10 8:30 ` Eli Cohen
2022-02-10 8:35 ` Jason Wang
2022-02-10 9:27 ` Eli Cohen
2022-02-14 6:06 ` Jason Wang
2022-02-16 7:15 ` Eli Cohen
2022-02-17 6:06 ` Jason Wang [this message]
2022-02-17 8:26 ` Eli Cohen
2022-02-07 12:55 ` [PATCH 3/3] vdpa: Add support to configure max number of VQs Eli Cohen
2022-02-10 8:07 ` Jason Wang
2022-02-10 8:44 ` Eli Cohen
2022-02-10 8:51 ` Jason Wang
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