Re: [PATCH v2 2/4] vdpa: pass initial config to _vdpa_register_device()
From: Si-Wei Liu
Date: Fri Oct 21 2022 - 20:31:46 EST
On 10/20/2022 7:51 PM, Jason Wang wrote:
On Fri, Oct 21, 2022 at 2:45 AM Si-Wei Liu <si-wei.liu@xxxxxxxxxx> 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@xxxxxxxxxx> 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@xxxxxxxxxx>
---
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@xxxxxxxxxx>
Date: Fri Apr 29 17:10:30 2022 +0800
vdpa/vp_vdpa : add vdpa tool support in vp_vdpa
OK, I was thinking of something else for e.g. support legacy driver
changing the default MAC with VIRTIO_NET_F_MAC provisioned. Then it
looks Alibaba eni_vdpa can only be provisioned without any config
attribute specified, thus unable to enjoy the other benefit from the
netlink API. Since it's kind of out of scope of my work, I'd like to
have the author of this driver (cc'ed) to make decision for it.
-Siwei
Thanks
-Siwei
Thanks