linux-kernel - Re: [PATCH V3 2/3] vdpa_sim_net: support feature provisioning

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Date:   Tue, 4 Oct 2022 14:46:22 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, elic@...dia.com, si-wei.liu@...cle.com,
        parav@...dia.com, wuzongyong@...ux.alibaba.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, eperezma@...hat.com,
        lingshan.zhu@...el.com, gdawar@...inx.com, lulu@...hat.com,
        xieyongji@...edance.com
Subject: Re: [PATCH V3 2/3] vdpa_sim_net: support feature provisioning

On Tue, Sep 27, 2022 at 03:48:09PM +0800, Jason Wang wrote:
>This patch implements features provisioning for vdpa_sim_net.
>
>1) validating the provisioned features to be a subset of the parent
>   features.
>2) clearing the features that is not wanted by the userspace
>
>For example:
>
># vdpa mgmtdev show
>vdpasim_net:
>  supported_classes net
>  max_supported_vqs 3
>  dev_features MTU MAC CTRL_VQ CTRL_MAC_ADDR ANY_LAYOUT VERSION_1 ACCESS_PLATFORM
>
>1) provision vDPA device with all features that are supported by the
>   net simulator
>
># vdpa dev add name dev1 mgmtdev vdpasim_net
># vdpa dev config show
>dev1: mac 00:00:00:00:00:00 link up link_announce false mtu 1500
>  negotiated_features MTU MAC CTRL_VQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM
>
>2) provision vDPA device with a subset of the features
>
># vdpa dev add name dev1 mgmtdev vdpasim_net device_features 0x300020000
># vdpa dev config show
>dev1: mac 00:00:00:00:00:00 link up link_announce false mtu 1500
>  negotiated_features CTRL_VQ VERSION_1 ACCESS_PLATFORM
>
>Reviewed-by: Eli Cohen <elic@...dia.com>
>Signed-off-by: Jason Wang <jasowang@...hat.com>
>---
> drivers/vdpa/vdpa_sim/vdpa_sim.c     | 12 +++++++++++-
> drivers/vdpa/vdpa_sim/vdpa_sim.h     |  3 ++-
> drivers/vdpa/vdpa_sim/vdpa_sim_blk.c |  2 +-
> drivers/vdpa/vdpa_sim/vdpa_sim_net.c |  5 +++--
> 4 files changed, 17 insertions(+), 5 deletions(-)
>
>diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
>index 225b7f5d8be3..b071f0d842fb 100644
>--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
>+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
>@@ -18,6 +18,7 @@
> #include <linux/vdpa.h>
> #include <linux/vhost_iotlb.h>
> #include <linux/iova.h>
>+#include <uapi/linux/vdpa.h>
>
> #include "vdpa_sim.h"
>
>@@ -245,13 +246,22 @@ static const struct dma_map_ops vdpasim_dma_ops = {
> static const struct vdpa_config_ops vdpasim_config_ops;
> static const struct vdpa_config_ops vdpasim_batch_config_ops;
>
>-struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
>+struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr,
>+			       const struct vdpa_dev_set_config *config)
> {
> 	const struct vdpa_config_ops *ops;
> 	struct vdpasim *vdpasim;
> 	struct device *dev;
> 	int i, ret = -ENOMEM;
>
>+	if (config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
>+		if (config->device_features &
>+		    ~dev_attr->supported_features)
>+			return ERR_PTR(-EINVAL);
>+		dev_attr->supported_features =
>+			config->device_features;
>+	}
>+
> 	if (batch_mapping)
> 		ops = &vdpasim_batch_config_ops;
> 	else
>diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h b/drivers/vdpa/vdpa_sim/vdpa_sim.h
>index 061986f30911..0e78737dcc16 100644
>--- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
>+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
>@@ -71,7 +71,8 @@ struct vdpasim {
> 	spinlock_t iommu_lock;
> };
>
>-struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr);
>+struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *attr,
>+			       const struct vdpa_dev_set_config *config);
>
> /* TODO: cross-endian support */
> static inline bool vdpasim_is_little_endian(struct vdpasim *vdpasim)
>diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
>index c8bfea3b7db2..c6db1a1baf76 100644
>--- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
>+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
>@@ -383,7 +383,7 @@ static int vdpasim_blk_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
> 	dev_attr.work_fn = vdpasim_blk_work;
> 	dev_attr.buffer_size = VDPASIM_BLK_CAPACITY << SECTOR_SHIFT;
>
>-	simdev = vdpasim_create(&dev_attr);
>+	simdev = vdpasim_create(&dev_attr, config);
> 	if (IS_ERR(simdev))
> 		return PTR_ERR(simdev);
>
>diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
>index 886449e88502..c3cb225ea469 100644
>--- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
>+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
>@@ -254,7 +254,7 @@ static int vdpasim_net_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
> 	dev_attr.work_fn = vdpasim_net_work;
> 	dev_attr.buffer_size = PAGE_SIZE;
>
>-	simdev = vdpasim_create(&dev_attr);
>+	simdev = vdpasim_create(&dev_attr, config);
> 	if (IS_ERR(simdev))
> 		return PTR_ERR(simdev);
>
>@@ -294,7 +294,8 @@ static struct vdpa_mgmt_dev mgmt_dev = {
> 	.id_table = id_table,
> 	.ops = &vdpasim_net_mgmtdev_ops,
> 	.config_attr_mask = (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR |
>-			     1 << VDPA_ATTR_DEV_NET_CFG_MTU),
>+			     1 << VDPA_ATTR_DEV_NET_CFG_MTU |
>+		             1 << VDPA_ATTR_DEV_FEATURES),
> 	.max_supported_vqs = VDPASIM_NET_VQ_NUM,
> 	.supported_features = VDPASIM_NET_FEATURES,
> };
>-- 
>2.25.1
>

Fine for me:

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

I'll send a followup to enable VDPA_ATTR_DEV_FEATURES in vdpa_sim_blk 
and test it.

Thanks,
Stefano