linux-kernel - Re: [PATCH v2 2/4] vdpa: pass initial config to _vdpa_register

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Date:   Fri, 21 Oct 2022 10:51:11 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Si-Wei Liu <si-wei.liu@...cle.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org,
        Wu Zongyong <wuzongyong@...ux.alibaba.com>
Subject: Re: [PATCH v2 2/4] vdpa: pass initial config to _vdpa_register_device()

On Fri, Oct 21, 2022 at 2:45 AM Si-Wei Liu <si-wei.liu@...cle.com> wrote:
>
>
>
> On 10/19/2022 10:20 PM, Jason Wang wrote:
> > On Wed, Oct 19, 2022 at 8:56 AM Si-Wei Liu <si-wei.liu@...cle.com> wrote:
> >> Just as _vdpa_register_device taking @nvqs as the number of queues
> > I wonder if it's better to embed nvqs in the config structure.
> Hmmm, the config structure is mostly for containing the configurables
> specified in the 'vdpa dev add' command, while each field is
> conditionally set and guarded by a corresponding mask bit. If @nvqs
> needs to be folded into a structure, I feel it might be better to use
> another struct for holding the informational fields (i.e. those are
> read-only and always exist). But doing this would make @nvqs a weird
> solo member in that struct with no extra benefit, and all the other
> informational fields shown in the 'vdpa dev show' command would be
> gotten from the device through config_ops directly. Maybe do this until
> another read-only field comes around?

That's fine.

>
> >
> >> to feed userspace inquery via vdpa_dev_fill(), we can follow the
> >> same to stash config attributes in struct vdpa_device at the time
> >> of vdpa registration.
> >>
> >> Signed-off-by: Si-Wei Liu <si-wei.liu@...cle.com>
> >> ---
> >>   drivers/vdpa/ifcvf/ifcvf_main.c      |  2 +-
> >>   drivers/vdpa/mlx5/net/mlx5_vnet.c    |  2 +-
> >>   drivers/vdpa/vdpa.c                  | 15 +++++++++++----
> >>   drivers/vdpa/vdpa_sim/vdpa_sim_blk.c |  2 +-
> >>   drivers/vdpa/vdpa_sim/vdpa_sim_net.c |  2 +-
> >>   drivers/vdpa/vdpa_user/vduse_dev.c   |  2 +-
> >>   drivers/vdpa/virtio_pci/vp_vdpa.c    |  3 ++-
> >>   include/linux/vdpa.h                 |  3 ++-
> >>   8 files changed, 20 insertions(+), 11 deletions(-)
> >>
> >> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
> >> index f9c0044..c54ab2c 100644
> >> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
> >> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
> >> @@ -771,7 +771,7 @@ static int ifcvf_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
> >>          else
> >>                  ret = dev_set_name(&vdpa_dev->dev, "vdpa%u", vdpa_dev->index);
> >>
> >> -       ret = _vdpa_register_device(&adapter->vdpa, vf->nr_vring);
> >> +       ret = _vdpa_register_device(&adapter->vdpa, vf->nr_vring, config);
> >>          if (ret) {
> >>                  put_device(&adapter->vdpa.dev);
> >>                  IFCVF_ERR(pdev, "Failed to register to vDPA bus");
> >> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> >> index 9091336..376082e 100644
> >> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> >> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> >> @@ -3206,7 +3206,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
> >>          mlx5_notifier_register(mdev, &ndev->nb);
> >>          ndev->nb_registered = true;
> >>          mvdev->vdev.mdev = &mgtdev->mgtdev;
> >> -       err = _vdpa_register_device(&mvdev->vdev, max_vqs + 1);
> >> +       err = _vdpa_register_device(&mvdev->vdev, max_vqs + 1, add_config);
> >>          if (err)
> >>                  goto err_reg;
> >>
> >> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> >> index febdc99..566c1c6 100644
> >> --- a/drivers/vdpa/vdpa.c
> >> +++ b/drivers/vdpa/vdpa.c
> >> @@ -215,11 +215,16 @@ static int vdpa_name_match(struct device *dev, const void *data)
> >>          return (strcmp(dev_name(&vdev->dev), data) == 0);
> >>   }
> >>
> >> -static int __vdpa_register_device(struct vdpa_device *vdev, u32 nvqs)
> >> +static int __vdpa_register_device(struct vdpa_device *vdev, u32 nvqs,
> >> +                                 const struct vdpa_dev_set_config *cfg)
> >>   {
> >>          struct device *dev;
> >>
> >>          vdev->nvqs = nvqs;
> >> +       if (cfg)
> >> +               vdev->vdev_cfg = *cfg;
> >> +       else
> >> +               vdev->vdev_cfg.mask = 0ULL;
> > I think it would be nice if we can convert eni to use netlink then we
> > don't need any workaround like this.
> Yes, Alibaba ENI is the only consumer of the old vdpa_register_device()
> API without being ported to the netlink API. Not sure what is needed but
> it seems another work to make netlink API committed to support a legacy
> compatible model?

It's only about the provisioning (which is kind of out of the spec).
So if I was not wrong, it should be something similar like the work
that Cindy has done, (per VF mgmtdev):

commit ffbda8e9df10d1784d5427ec199e7d8308e3763f
Author: Cindy Lu <lulu@...hat.com>
Date:   Fri Apr 29 17:10:30 2022 +0800

    vdpa/vp_vdpa : add vdpa tool support in vp_vdpa

Thanks

>
> -Siwei
>
> >
> > Thanks
> >
>