[PATCH 0/6] features provisioning fixes and mlx5_vdpa support

[PATCH 0/6] features provisioning fixes and mlx5_vdpa support

[Si-Wei Liu]

This patchset is pre-requisite to export and provision device
config attributes and features for vdpa live migration, in a way
backward and forward compatibility can be retained. The follow up
work [1] will need to be built around the new feature provisioning
uAPI, with which it's easier to formalize migration compatibility
support at the driver level.

Thanks,
-Siwei

[1] [PATCH v3 0/4] vDPA: initial config export via "vdpa dev show"
https://lore.kernel.org/virtualization/1666392237-4042-1-git-send-email-si-wei.liu@oracle.com/

---

Si-Wei Liu (6):
  vdpa: fix improper error message when adding vdpa dev
  vdpa: conditionally read STATUS in config space
  vdpa: validate provisioned device features against specified attribute
  virtio: VIRTIO_DEVICE_F_MASK for all per-device features
  vdpa: validate device feature provisioning against supported class
  vdpa/mlx5: support device features provisioning

 drivers/vdpa/mlx5/net/mlx5_vnet.c  | 72 ++++++++++++++++++++++------
 drivers/vdpa/vdpa.c                | 98 ++++++++++++++++++++++++++++++++------
 include/uapi/linux/virtio_config.h |  8 ++++
 3 files changed, 149 insertions(+), 29 deletions(-)

-- 
1.8.3.1

[PATCH 0/6] features provisioning fixes and mlx5_vdpa support

[Si-Wei Liu]

This patchset is pre-requisite to export and provision device
config attributes and features for vdpa live migration, in a way
backward and forward compatibility can be retained. The follow up
work [1] will need to be built around the new feature provisioning
uAPI, with which it's easier to formalize migration compatibility
support at the driver level.

Thanks,
-Siwei

[1] [PATCH v3 0/4] vDPA: initial config export via "vdpa dev show"
https://lore.kernel.org/virtualization/1666392237-4042-1-git-send-email-si-wei.liu@oracle.com/

---

Si-Wei Liu (6):
  vdpa: fix improper error message when adding vdpa dev
  vdpa: conditionally read STATUS in config space
  vdpa: validate provisioned device features against specified attribute
  virtio: VIRTIO_DEVICE_F_MASK for all per-device features
  vdpa: validate device feature provisioning against supported class
  vdpa/mlx5: support device features provisioning

 drivers/vdpa/mlx5/net/mlx5_vnet.c  | 72 ++++++++++++++++++++++------
 drivers/vdpa/vdpa.c                | 98 ++++++++++++++++++++++++++++++++------
 include/uapi/linux/virtio_config.h |  8 ++++
 3 files changed, 149 insertions(+), 29 deletions(-)

-- 
1.8.3.1

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[PATCH 1/6] vdpa: fix improper error message when adding vdpa dev

[Si-Wei Liu]

In below example, before the fix, mtu attribute is supported
by the parent mgmtdev, but the error message showing "All
provided are not supported" is just misleading.

$ 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

$ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
Error: vdpa: All provided attributes are not supported.
kernel answers: Operation not supported

After fix, the relevant error message will be like:

$ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
Error: vdpa: Some provided attributes are not supported.
kernel answers: Operation not supported

$ vdpa dev add mgmtdev vdpasim_net name vdpasim0 max_vqp 2
Error: vdpa: All provided attributes are not supported.
kernel answers: Operation not supported

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
 drivers/vdpa/vdpa.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 8ef7aa1..5e57935 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -622,13 +622,20 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
 		err = PTR_ERR(mdev);
 		goto err;
 	}
-	if ((config.mask & mdev->config_attr_mask) != config.mask) {
+	if (config.mask && (config.mask & mdev->config_attr_mask) == 0) {
 		NL_SET_ERR_MSG_MOD(info->extack,
 				   "All provided attributes are not supported");
 		err = -EOPNOTSUPP;
 		goto err;
 	}
 
+	if ((config.mask & mdev->config_attr_mask) != config.mask) {
+		NL_SET_ERR_MSG_MOD(info->extack,
+				   "Some provided attributes are not supported");
+		err = -EOPNOTSUPP;
+		goto err;
+	}
+
 	err = mdev->ops->dev_add(mdev, name, &config);
 err:
 	up_write(&vdpa_dev_lock);
-- 
1.8.3.1

[PATCH 1/6] vdpa: fix improper error message when adding vdpa dev

[Si-Wei Liu]

In below example, before the fix, mtu attribute is supported
by the parent mgmtdev, but the error message showing "All
provided are not supported" is just misleading.

$ 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

$ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
Error: vdpa: All provided attributes are not supported.
kernel answers: Operation not supported

After fix, the relevant error message will be like:

$ vdpa dev add mgmtdev vdpasim_net name vdpasim0 mtu 5000 max_vqp 2
Error: vdpa: Some provided attributes are not supported.
kernel answers: Operation not supported

$ vdpa dev add mgmtdev vdpasim_net name vdpasim0 max_vqp 2
Error: vdpa: All provided attributes are not supported.
kernel answers: Operation not supported

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
---
 drivers/vdpa/vdpa.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 8ef7aa1..5e57935 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -622,13 +622,20 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
 		err = PTR_ERR(mdev);
 		goto err;
 	}
-	if ((config.mask & mdev->config_attr_mask) != config.mask) {
+	if (config.mask && (config.mask & mdev->config_attr_mask) == 0) {
 		NL_SET_ERR_MSG_MOD(info->extack,
 				   "All provided attributes are not supported");
 		err = -EOPNOTSUPP;
 		goto err;
 	}
 
+	if ((config.mask & mdev->config_attr_mask) != config.mask) {
+		NL_SET_ERR_MSG_MOD(info->extack,
+				   "Some provided attributes are not supported");
+		err = -EOPNOTSUPP;
+		goto err;
+	}
+
 	err = mdev->ops->dev_add(mdev, name, &config);
 err:
 	up_write(&vdpa_dev_lock);
-- 
1.8.3.1

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[PATCH 2/6] vdpa: conditionally read STATUS in config space

[Si-Wei Liu]

The spec says:
    status only exists if VIRTIO_NET_F_STATUS is set

Similar to MAC and MTU, vdpa_dev_net_config_fill() should read
STATUS conditionally depending on the feature bits.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 drivers/vdpa/vdpa.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 5e57935..5f4883b 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -848,18 +848,25 @@ static int vdpa_dev_net_mac_config_fill(struct sk_buff *msg, u64 features,
 			sizeof(config->mac), config->mac);
 }
 
+static int vdpa_dev_net_status_config_fill(struct sk_buff *msg, u64 features,
+					   const struct virtio_net_config *config)
+{
+	u16 val_u16;
+
+	if ((features & BIT_ULL(VIRTIO_NET_F_STATUS)) == 0)
+		return 0;
+
+	val_u16 = __virtio16_to_cpu(true, config->status);
+	return nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16);
+}
+
 static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
 {
 	struct virtio_net_config config = {};
 	u64 features_device;
-	u16 val_u16;
 
 	vdev->config->get_config(vdev, 0, &config, sizeof(config));
 
-	val_u16 = __virtio16_to_cpu(true, config.status);
-	if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16))
-		return -EMSGSIZE;
-
 	features_device = vdev->config->get_device_features(vdev);
 
 	if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_FEATURES, features_device,
@@ -872,6 +879,9 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
 	if (vdpa_dev_net_mac_config_fill(msg, features_device, &config))
 		return -EMSGSIZE;
 
+	if (vdpa_dev_net_status_config_fill(msg, features_device, &config))
+		return -EMSGSIZE;
+
 	return vdpa_dev_net_mq_config_fill(msg, features_device, &config);
 }
 
-- 
1.8.3.1

[PATCH 2/6] vdpa: conditionally read STATUS in config space

[Si-Wei Liu]

The spec says:
    status only exists if VIRTIO_NET_F_STATUS is set

Similar to MAC and MTU, vdpa_dev_net_config_fill() should read
STATUS conditionally depending on the feature bits.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 drivers/vdpa/vdpa.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 5e57935..5f4883b 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -848,18 +848,25 @@ static int vdpa_dev_net_mac_config_fill(struct sk_buff *msg, u64 features,
 			sizeof(config->mac), config->mac);
 }
 
+static int vdpa_dev_net_status_config_fill(struct sk_buff *msg, u64 features,
+					   const struct virtio_net_config *config)
+{
+	u16 val_u16;
+
+	if ((features & BIT_ULL(VIRTIO_NET_F_STATUS)) == 0)
+		return 0;
+
+	val_u16 = __virtio16_to_cpu(true, config->status);
+	return nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16);
+}
+
 static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
 {
 	struct virtio_net_config config = {};
 	u64 features_device;
-	u16 val_u16;
 
 	vdev->config->get_config(vdev, 0, &config, sizeof(config));
 
-	val_u16 = __virtio16_to_cpu(true, config.status);
-	if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16))
-		return -EMSGSIZE;
-
 	features_device = vdev->config->get_device_features(vdev);
 
 	if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_FEATURES, features_device,
@@ -872,6 +879,9 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
 	if (vdpa_dev_net_mac_config_fill(msg, features_device, &config))
 		return -EMSGSIZE;
 
+	if (vdpa_dev_net_status_config_fill(msg, features_device, &config))
+		return -EMSGSIZE;
+
 	return vdpa_dev_net_mq_config_fill(msg, features_device, &config);
 }
 
-- 
1.8.3.1

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[PATCH 3/6] vdpa: validate provisioned device features against specified attribute

[Si-Wei Liu]

With device feature provisioning, there's a chance for misconfiguration
that the vdpa feature attribute supplied in 'vdpa dev add' command doesn't
get selected on the device_features to be provisioned. For instance, when
a @mac attribute is specified, the corresponding feature bit _F_MAC in
device_features should be set for consistency. If there's conflict on
provisioned features against the attribute, it should be treated as an
error to fail the ambiguous command. Noted the opposite is not
necessarily true, for e.g. it's okay to have _F_MAC set in device_features
without providing a corresponding @mac attribute, in which case the vdpa
vendor driver could load certain default value for attribute that is not
explicitly specified.

Generalize this check in vdpa core so that there's no duplicate code in
each vendor driver.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 drivers/vdpa/vdpa.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 5f4883b..6d02b8c 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -601,8 +601,26 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
 		config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
 	}
 	if (nl_attrs[VDPA_ATTR_DEV_FEATURES]) {
+		u64 missing = 0x0ULL;
+
 		config.device_features =
 			nla_get_u64(nl_attrs[VDPA_ATTR_DEV_FEATURES]);
+		if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR] &&
+		    !(config.device_features & BIT_ULL(VIRTIO_NET_F_MAC)))
+			missing |= BIT_ULL(VIRTIO_NET_F_MAC);
+		if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU] &&
+		    !(config.device_features & BIT_ULL(VIRTIO_NET_F_MTU)))
+			missing |= BIT_ULL(VIRTIO_NET_F_MTU);
+		if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MAX_VQP] &&
+		    config.net.max_vq_pairs > 1 &&
+		    !(config.device_features & BIT_ULL(VIRTIO_NET_F_MQ)))
+			missing |= BIT_ULL(VIRTIO_NET_F_MQ);
+		if (missing) {
+			NL_SET_ERR_MSG_FMT_MOD(info->extack,
+					       "Missing features 0x%llx for provided attributes",
+					       missing);
+			return -EINVAL;
+		}
 		config.mask |= BIT_ULL(VDPA_ATTR_DEV_FEATURES);
 	}
 
-- 
1.8.3.1

[PATCH 3/6] vdpa: validate provisioned device features against specified attribute

[Si-Wei Liu]

With device feature provisioning, there's a chance for misconfiguration
that the vdpa feature attribute supplied in 'vdpa dev add' command doesn't
get selected on the device_features to be provisioned. For instance, when
a @mac attribute is specified, the corresponding feature bit _F_MAC in
device_features should be set for consistency. If there's conflict on
provisioned features against the attribute, it should be treated as an
error to fail the ambiguous command. Noted the opposite is not
necessarily true, for e.g. it's okay to have _F_MAC set in device_features
without providing a corresponding @mac attribute, in which case the vdpa
vendor driver could load certain default value for attribute that is not
explicitly specified.

Generalize this check in vdpa core so that there's no duplicate code in
each vendor driver.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 drivers/vdpa/vdpa.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 5f4883b..6d02b8c 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -601,8 +601,26 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
 		config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
 	}
 	if (nl_attrs[VDPA_ATTR_DEV_FEATURES]) {
+		u64 missing = 0x0ULL;
+
 		config.device_features =
 			nla_get_u64(nl_attrs[VDPA_ATTR_DEV_FEATURES]);
+		if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR] &&
+		    !(config.device_features & BIT_ULL(VIRTIO_NET_F_MAC)))
+			missing |= BIT_ULL(VIRTIO_NET_F_MAC);
+		if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MTU] &&
+		    !(config.device_features & BIT_ULL(VIRTIO_NET_F_MTU)))
+			missing |= BIT_ULL(VIRTIO_NET_F_MTU);
+		if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MAX_VQP] &&
+		    config.net.max_vq_pairs > 1 &&
+		    !(config.device_features & BIT_ULL(VIRTIO_NET_F_MQ)))
+			missing |= BIT_ULL(VIRTIO_NET_F_MQ);
+		if (missing) {
+			NL_SET_ERR_MSG_FMT_MOD(info->extack,
+					       "Missing features 0x%llx for provided attributes",
+					       missing);
+			return -EINVAL;
+		}
 		config.mask |= BIT_ULL(VDPA_ATTR_DEV_FEATURES);
 	}
 
-- 
1.8.3.1

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[PATCH 4/6] virtio: VIRTIO_DEVICE_F_MASK for all per-device features

[Si-Wei Liu]

Introduce VIRTIO_DEVICE_F_MASK bitmask used for identification
of per-device features. Feature bits VIRTIO_TRANSPORT_F_START
through VIRTIO_TRANSPORT_F_END are reserved for transport
features hence are not counted as per-device features against
the 64bit feature space.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 include/uapi/linux/virtio_config.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index 3c05162..3bdc7ed 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -54,6 +54,14 @@
 #define VIRTIO_TRANSPORT_F_START	28
 #define VIRTIO_TRANSPORT_F_END		41
 
+/*
+ * Bitmask for all per-device features: feature bits VIRTIO_TRANSPORT_F_START
+ * through VIRTIO_TRANSPORT_F_END are unset, i.e. 0xfffffc000fffffff for
+ * all 64bit features
+ */
+#define VIRTIO_DEVICE_F_MASK (~0ULL << (VIRTIO_TRANSPORT_F_END + 1) | \
+			      ((1ULL << VIRTIO_TRANSPORT_F_START) - 1))
+
 #ifndef VIRTIO_CONFIG_NO_LEGACY
 /* Do we get callbacks when the ring is completely used, even if we've
  * suppressed them? */
-- 
1.8.3.1

[PATCH 4/6] virtio: VIRTIO_DEVICE_F_MASK for all per-device features

[Si-Wei Liu]

Introduce VIRTIO_DEVICE_F_MASK bitmask used for identification
of per-device features. Feature bits VIRTIO_TRANSPORT_F_START
through VIRTIO_TRANSPORT_F_END are reserved for transport
features hence are not counted as per-device features against
the 64bit feature space.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 include/uapi/linux/virtio_config.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index 3c05162..3bdc7ed 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -54,6 +54,14 @@
 #define VIRTIO_TRANSPORT_F_START	28
 #define VIRTIO_TRANSPORT_F_END		41
 
+/*
+ * Bitmask for all per-device features: feature bits VIRTIO_TRANSPORT_F_START
+ * through VIRTIO_TRANSPORT_F_END are unset, i.e. 0xfffffc000fffffff for
+ * all 64bit features
+ */
+#define VIRTIO_DEVICE_F_MASK (~0ULL << (VIRTIO_TRANSPORT_F_END + 1) | \
+			      ((1ULL << VIRTIO_TRANSPORT_F_START) - 1))
+
 #ifndef VIRTIO_CONFIG_NO_LEGACY
 /* Do we get callbacks when the ring is completely used, even if we've
  * suppressed them? */
-- 
1.8.3.1

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[PATCH 5/6] vdpa: validate device feature provisioning against supported class

[Si-Wei Liu]

Today when device features are explicitly provisioned, the features
user supplied may contain device class specific features that are
not supported by the parent managment device. On the other hand,
when parent managment device supports more than one class, the
device features to provision may be ambiguous if none of the class
specific attributes is provided at the same time. Validate these
cases and prompt appropriate user errors accordingly.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 drivers/vdpa/vdpa.c | 51 ++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 42 insertions(+), 9 deletions(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 6d02b8c..d5d6729 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -460,12 +460,30 @@ static int vdpa_nl_mgmtdev_handle_fill(struct sk_buff *msg, const struct vdpa_mg
 	return 0;
 }
 
+static u64 vdpa_mgmtdev_get_classes(const struct vdpa_mgmt_dev *mdev,
+				    unsigned int *nclasses)
+{
+	u64 supported_classes = 0;
+	unsigned int n = 0;
+	int i = 0;
+
+	while (mdev->id_table[i].device) {
+		if (mdev->id_table[i].device <= 63) {
+			supported_classes |= BIT_ULL(mdev->id_table[i].device);
+			n++;
+		}
+		i++;
+	}
+	if (nclasses)
+		*nclasses = n;
+
+	return supported_classes;
+}
+
 static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *msg,
 			     u32 portid, u32 seq, int flags)
 {
-	u64 supported_classes = 0;
 	void *hdr;
-	int i = 0;
 	int err;
 
 	hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_MGMTDEV_NEW);
@@ -475,14 +493,9 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
 	if (err)
 		goto msg_err;
 
-	while (mdev->id_table[i].device) {
-		if (mdev->id_table[i].device <= 63)
-			supported_classes |= BIT_ULL(mdev->id_table[i].device);
-		i++;
-	}
-
 	if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES,
-			      supported_classes, VDPA_ATTR_UNSPEC)) {
+			      vdpa_mgmtdev_get_classes(mdev, NULL),
+			      VDPA_ATTR_UNSPEC)) {
 		err = -EMSGSIZE;
 		goto msg_err;
 	}
@@ -571,8 +584,10 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
 	struct vdpa_dev_set_config config = {};
 	struct nlattr **nl_attrs = info->attrs;
 	struct vdpa_mgmt_dev *mdev;
+	unsigned int ncls = 0;
 	const u8 *macaddr;
 	const char *name;
+	u64 classes;
 	int err = 0;
 
 	if (!info->attrs[VDPA_ATTR_DEV_NAME])
@@ -654,6 +669,24 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
 		goto err;
 	}
 
+	classes = vdpa_mgmtdev_get_classes(mdev, &ncls);
+	if (config.mask & VDPA_DEV_NET_ATTRS_MASK &&
+	    !(classes & BIT_ULL(VIRTIO_ID_NET))) {
+		NL_SET_ERR_MSG_MOD(info->extack,
+				   "Network class attributes provided on unsupported management device");
+		err = -EINVAL;
+		goto err;
+	}
+	if (!(config.mask & VDPA_DEV_NET_ATTRS_MASK) &&
+	    config.mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES) &&
+	    classes & BIT_ULL(VIRTIO_ID_NET) && ncls > 1 &&
+	    config.device_features & VIRTIO_DEVICE_F_MASK) {
+		NL_SET_ERR_MSG_MOD(info->extack,
+				   "Management device supports multi-class while device features specified are ambiguous");
+		err = -EINVAL;
+		goto err;
+	}
+
 	err = mdev->ops->dev_add(mdev, name, &config);
 err:
 	up_write(&vdpa_dev_lock);
-- 
1.8.3.1

[PATCH 5/6] vdpa: validate device feature provisioning against supported class

[Si-Wei Liu]

Today when device features are explicitly provisioned, the features
user supplied may contain device class specific features that are
not supported by the parent managment device. On the other hand,
when parent managment device supports more than one class, the
device features to provision may be ambiguous if none of the class
specific attributes is provided at the same time. Validate these
cases and prompt appropriate user errors accordingly.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 drivers/vdpa/vdpa.c | 51 ++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 42 insertions(+), 9 deletions(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 6d02b8c..d5d6729 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -460,12 +460,30 @@ static int vdpa_nl_mgmtdev_handle_fill(struct sk_buff *msg, const struct vdpa_mg
 	return 0;
 }
 
+static u64 vdpa_mgmtdev_get_classes(const struct vdpa_mgmt_dev *mdev,
+				    unsigned int *nclasses)
+{
+	u64 supported_classes = 0;
+	unsigned int n = 0;
+	int i = 0;
+
+	while (mdev->id_table[i].device) {
+		if (mdev->id_table[i].device <= 63) {
+			supported_classes |= BIT_ULL(mdev->id_table[i].device);
+			n++;
+		}
+		i++;
+	}
+	if (nclasses)
+		*nclasses = n;
+
+	return supported_classes;
+}
+
 static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *msg,
 			     u32 portid, u32 seq, int flags)
 {
-	u64 supported_classes = 0;
 	void *hdr;
-	int i = 0;
 	int err;
 
 	hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags, VDPA_CMD_MGMTDEV_NEW);
@@ -475,14 +493,9 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
 	if (err)
 		goto msg_err;
 
-	while (mdev->id_table[i].device) {
-		if (mdev->id_table[i].device <= 63)
-			supported_classes |= BIT_ULL(mdev->id_table[i].device);
-		i++;
-	}
-
 	if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES,
-			      supported_classes, VDPA_ATTR_UNSPEC)) {
+			      vdpa_mgmtdev_get_classes(mdev, NULL),
+			      VDPA_ATTR_UNSPEC)) {
 		err = -EMSGSIZE;
 		goto msg_err;
 	}
@@ -571,8 +584,10 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
 	struct vdpa_dev_set_config config = {};
 	struct nlattr **nl_attrs = info->attrs;
 	struct vdpa_mgmt_dev *mdev;
+	unsigned int ncls = 0;
 	const u8 *macaddr;
 	const char *name;
+	u64 classes;
 	int err = 0;
 
 	if (!info->attrs[VDPA_ATTR_DEV_NAME])
@@ -654,6 +669,24 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
 		goto err;
 	}
 
+	classes = vdpa_mgmtdev_get_classes(mdev, &ncls);
+	if (config.mask & VDPA_DEV_NET_ATTRS_MASK &&
+	    !(classes & BIT_ULL(VIRTIO_ID_NET))) {
+		NL_SET_ERR_MSG_MOD(info->extack,
+				   "Network class attributes provided on unsupported management device");
+		err = -EINVAL;
+		goto err;
+	}
+	if (!(config.mask & VDPA_DEV_NET_ATTRS_MASK) &&
+	    config.mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES) &&
+	    classes & BIT_ULL(VIRTIO_ID_NET) && ncls > 1 &&
+	    config.device_features & VIRTIO_DEVICE_F_MASK) {
+		NL_SET_ERR_MSG_MOD(info->extack,
+				   "Management device supports multi-class while device features specified are ambiguous");
+		err = -EINVAL;
+		goto err;
+	}
+
 	err = mdev->ops->dev_add(mdev, name, &config);
 err:
 	up_write(&vdpa_dev_lock);
-- 
1.8.3.1

_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization

[PATCH 6/6] vdpa/mlx5: support device features provisioning

[Si-Wei Liu]

This patch implements features provisioning for mlx5_vdpa.

1) Validate the provisioned features are a subset of the parent
   features.
2) Clearing features that are not wanted by userspace.
3) Set config space field only when the corresponding feature is
   provisioned.

For example:

   # vdpa mgmtdev show
   pci/0000:41:04.2:
     supported_classes net
     max_supported_vqs 65
     dev_features CSUM GUEST_CSUM MTU MAC HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ CTRL_VLAN MQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM

1) Provision vDPA device with all features derived from the parent

   # vdpa dev add name vdpa1 mgmtdev pci/0000:41:04.2
   # vdpa dev config show
   vdpa1: mac e4:11:c6:d3:45:f0 link up link_announce false max_vq_pairs 1 mtu 1500
     negotiated_features CSUM GUEST_CSUM MTU HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ CTRL_VLAN MQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM

2) Provision vDPA device with a subset of parent features

   # vdpa dev add name vdpa1 mgmtdev pci/0000:41:04.2 device_features 0x300020000
   # vdpa dev config show
   vdpa1:
     negotiated_features CTRL_VQ VERSION_1 ACCESS_PLATFORM

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 72 +++++++++++++++++++++++++++++++--------
 1 file changed, 58 insertions(+), 14 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 3a6dbbc6..5d6dfd2 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -2183,6 +2183,7 @@ static u64 get_supported_features(struct mlx5_core_dev *mdev)
 	mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_STATUS);
 	mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_MTU);
 	mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_CTRL_VLAN);
+	mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_MAC);
 
 	return mlx_vdpa_features;
 }
@@ -3009,6 +3010,8 @@ static int event_handler(struct notifier_block *nb, unsigned long event, void *p
 	struct mlx5_vdpa_wq_ent *wqent;
 
 	if (event == MLX5_EVENT_TYPE_PORT_CHANGE) {
+		if (!(ndev->mvdev.actual_features & BIT_ULL(VIRTIO_NET_F_STATUS)))
+			return NOTIFY_DONE;
 		switch (eqe->sub_type) {
 		case MLX5_PORT_CHANGE_SUBTYPE_DOWN:
 		case MLX5_PORT_CHANGE_SUBTYPE_ACTIVE:
@@ -3060,6 +3063,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 	struct mlx5_vdpa_dev *mvdev;
 	struct mlx5_vdpa_net *ndev;
 	struct mlx5_core_dev *mdev;
+	u64 device_features;
 	u32 max_vqs;
 	u16 mtu;
 	int err;
@@ -3068,6 +3072,25 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 		return -ENOSPC;
 
 	mdev = mgtdev->madev->mdev;
+	device_features = mgtdev->mgtdev.supported_features;
+	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
+		if (add_config->device_features & ~device_features) {
+			dev_warn(mdev->device,
+				 "The provisioned features 0x%llx are not supported by this device with features 0x%llx\n",
+				 add_config->device_features, device_features);
+			return -EINVAL;
+		}
+		device_features &= add_config->device_features;
+	}
+	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES) &&
+	    !(device_features & BIT_ULL(VIRTIO_F_VERSION_1) &&
+	      device_features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM))) {
+		dev_warn(mdev->device,
+			 "Must provision minimum features 0x%llx for this device",
+			 BIT_ULL(VIRTIO_F_VERSION_1) | BIT_ULL(VIRTIO_F_ACCESS_PLATFORM));
+		return -EOPNOTSUPP;
+	}
+
 	if (!(MLX5_CAP_DEV_VDPA_EMULATION(mdev, virtio_queue_type) &
 	    MLX5_VIRTIO_EMULATION_CAP_VIRTIO_QUEUE_TYPE_SPLIT)) {
 		dev_warn(mdev->device, "missing support for split virtqueues\n");
@@ -3096,7 +3119,6 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 	if (IS_ERR(ndev))
 		return PTR_ERR(ndev);
 
-	ndev->mvdev.mlx_features = mgtdev->mgtdev.supported_features;
 	ndev->mvdev.max_vqs = max_vqs;
 	mvdev = &ndev->mvdev;
 	mvdev->mdev = mdev;
@@ -3118,20 +3140,26 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 			goto err_alloc;
 	}
 
-	err = query_mtu(mdev, &mtu);
-	if (err)
-		goto err_alloc;
+	if (device_features & BIT_ULL(VIRTIO_NET_F_MTU)) {
+		err = query_mtu(mdev, &mtu);
+		if (err)
+			goto err_alloc;
 
-	ndev->config.mtu = cpu_to_mlx5vdpa16(mvdev, mtu);
+		ndev->config.mtu = cpu_to_mlx5vdpa16(mvdev, mtu);
+	}
 
-	if (get_link_state(mvdev))
-		ndev->config.status |= cpu_to_mlx5vdpa16(mvdev, VIRTIO_NET_S_LINK_UP);
-	else
-		ndev->config.status &= cpu_to_mlx5vdpa16(mvdev, ~VIRTIO_NET_S_LINK_UP);
+	if (device_features & BIT_ULL(VIRTIO_NET_F_STATUS)) {
+		if (get_link_state(mvdev))
+			ndev->config.status |= cpu_to_mlx5vdpa16(mvdev, VIRTIO_NET_S_LINK_UP);
+		else
+			ndev->config.status &= cpu_to_mlx5vdpa16(mvdev, ~VIRTIO_NET_S_LINK_UP);
+	}
 
 	if (add_config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
 		memcpy(ndev->config.mac, add_config->net.mac, ETH_ALEN);
-	} else {
+	/* No bother setting mac address in config if not going to provision _F_MAC */
+	} else if ((add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) == 0 ||
+		   device_features & BIT_ULL(VIRTIO_NET_F_MAC)) {
 		err = mlx5_query_nic_vport_mac_address(mdev, 0, 0, config->mac);
 		if (err)
 			goto err_alloc;
@@ -3142,11 +3170,26 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 		err = mlx5_mpfs_add_mac(pfmdev, config->mac);
 		if (err)
 			goto err_alloc;
-
-		ndev->mvdev.mlx_features |= BIT_ULL(VIRTIO_NET_F_MAC);
+	} else if ((add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) == 0) {
+		/*
+		 * We used to clear _F_MAC feature bit if seeing
+		 * zero mac address when device features are not
+		 * specifically provisioned. Keep the behaviour
+		 * so old scripts do not break.
+		 */
+		device_features &= ~BIT_ULL(VIRTIO_NET_F_MAC);
+	} else if (device_features & BIT_ULL(VIRTIO_NET_F_MAC)) {
+		/* Don't provision zero mac address for _F_MAC */
+		mlx5_vdpa_warn(&ndev->mvdev,
+			       "No mac address provisioned?\n");
+		err = -EINVAL;
+		goto err_alloc;
 	}
 
-	config->max_virtqueue_pairs = cpu_to_mlx5vdpa16(mvdev, max_vqs / 2);
+	if (device_features & BIT_ULL(VIRTIO_NET_F_MQ))
+		config->max_virtqueue_pairs = cpu_to_mlx5vdpa16(mvdev, max_vqs / 2);
+
+	ndev->mvdev.mlx_features = device_features;
 	mvdev->vdev.dma_dev = &mdev->pdev->dev;
 	err = mlx5_vdpa_alloc_resources(&ndev->mvdev);
 	if (err)
@@ -3243,7 +3286,8 @@ static int mlx5v_probe(struct auxiliary_device *adev,
 	mgtdev->mgtdev.id_table = id_table;
 	mgtdev->mgtdev.config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR) |
 					  BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP) |
-					  BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU);
+					  BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU) |
+					  BIT_ULL(VDPA_ATTR_DEV_FEATURES);
 	mgtdev->mgtdev.max_supported_vqs =
 		MLX5_CAP_DEV_VDPA_EMULATION(mdev, max_num_virtio_queues) + 1;
 	mgtdev->mgtdev.supported_features = get_supported_features(mdev);
-- 
1.8.3.1

[PATCH 6/6] vdpa/mlx5: support device features provisioning

[Si-Wei Liu]

This patch implements features provisioning for mlx5_vdpa.

1) Validate the provisioned features are a subset of the parent
   features.
2) Clearing features that are not wanted by userspace.
3) Set config space field only when the corresponding feature is
   provisioned.

For example:

   # vdpa mgmtdev show
   pci/0000:41:04.2:
     supported_classes net
     max_supported_vqs 65
     dev_features CSUM GUEST_CSUM MTU MAC HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ CTRL_VLAN MQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM

1) Provision vDPA device with all features derived from the parent

   # vdpa dev add name vdpa1 mgmtdev pci/0000:41:04.2
   # vdpa dev config show
   vdpa1: mac e4:11:c6:d3:45:f0 link up link_announce false max_vq_pairs 1 mtu 1500
     negotiated_features CSUM GUEST_CSUM MTU HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ CTRL_VLAN MQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM

2) Provision vDPA device with a subset of parent features

   # vdpa dev add name vdpa1 mgmtdev pci/0000:41:04.2 device_features 0x300020000
   # vdpa dev config show
   vdpa1:
     negotiated_features CTRL_VQ VERSION_1 ACCESS_PLATFORM

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 drivers/vdpa/mlx5/net/mlx5_vnet.c | 72 +++++++++++++++++++++++++++++++--------
 1 file changed, 58 insertions(+), 14 deletions(-)

diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
index 3a6dbbc6..5d6dfd2 100644
--- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
+++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
@@ -2183,6 +2183,7 @@ static u64 get_supported_features(struct mlx5_core_dev *mdev)
 	mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_STATUS);
 	mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_MTU);
 	mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_CTRL_VLAN);
+	mlx_vdpa_features |= BIT_ULL(VIRTIO_NET_F_MAC);
 
 	return mlx_vdpa_features;
 }
@@ -3009,6 +3010,8 @@ static int event_handler(struct notifier_block *nb, unsigned long event, void *p
 	struct mlx5_vdpa_wq_ent *wqent;
 
 	if (event == MLX5_EVENT_TYPE_PORT_CHANGE) {
+		if (!(ndev->mvdev.actual_features & BIT_ULL(VIRTIO_NET_F_STATUS)))
+			return NOTIFY_DONE;
 		switch (eqe->sub_type) {
 		case MLX5_PORT_CHANGE_SUBTYPE_DOWN:
 		case MLX5_PORT_CHANGE_SUBTYPE_ACTIVE:
@@ -3060,6 +3063,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 	struct mlx5_vdpa_dev *mvdev;
 	struct mlx5_vdpa_net *ndev;
 	struct mlx5_core_dev *mdev;
+	u64 device_features;
 	u32 max_vqs;
 	u16 mtu;
 	int err;
@@ -3068,6 +3072,25 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 		return -ENOSPC;
 
 	mdev = mgtdev->madev->mdev;
+	device_features = mgtdev->mgtdev.supported_features;
+	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
+		if (add_config->device_features & ~device_features) {
+			dev_warn(mdev->device,
+				 "The provisioned features 0x%llx are not supported by this device with features 0x%llx\n",
+				 add_config->device_features, device_features);
+			return -EINVAL;
+		}
+		device_features &= add_config->device_features;
+	}
+	if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES) &&
+	    !(device_features & BIT_ULL(VIRTIO_F_VERSION_1) &&
+	      device_features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM))) {
+		dev_warn(mdev->device,
+			 "Must provision minimum features 0x%llx for this device",
+			 BIT_ULL(VIRTIO_F_VERSION_1) | BIT_ULL(VIRTIO_F_ACCESS_PLATFORM));
+		return -EOPNOTSUPP;
+	}
+
 	if (!(MLX5_CAP_DEV_VDPA_EMULATION(mdev, virtio_queue_type) &
 	    MLX5_VIRTIO_EMULATION_CAP_VIRTIO_QUEUE_TYPE_SPLIT)) {
 		dev_warn(mdev->device, "missing support for split virtqueues\n");
@@ -3096,7 +3119,6 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 	if (IS_ERR(ndev))
 		return PTR_ERR(ndev);
 
-	ndev->mvdev.mlx_features = mgtdev->mgtdev.supported_features;
 	ndev->mvdev.max_vqs = max_vqs;
 	mvdev = &ndev->mvdev;
 	mvdev->mdev = mdev;
@@ -3118,20 +3140,26 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 			goto err_alloc;
 	}
 
-	err = query_mtu(mdev, &mtu);
-	if (err)
-		goto err_alloc;
+	if (device_features & BIT_ULL(VIRTIO_NET_F_MTU)) {
+		err = query_mtu(mdev, &mtu);
+		if (err)
+			goto err_alloc;
 
-	ndev->config.mtu = cpu_to_mlx5vdpa16(mvdev, mtu);
+		ndev->config.mtu = cpu_to_mlx5vdpa16(mvdev, mtu);
+	}
 
-	if (get_link_state(mvdev))
-		ndev->config.status |= cpu_to_mlx5vdpa16(mvdev, VIRTIO_NET_S_LINK_UP);
-	else
-		ndev->config.status &= cpu_to_mlx5vdpa16(mvdev, ~VIRTIO_NET_S_LINK_UP);
+	if (device_features & BIT_ULL(VIRTIO_NET_F_STATUS)) {
+		if (get_link_state(mvdev))
+			ndev->config.status |= cpu_to_mlx5vdpa16(mvdev, VIRTIO_NET_S_LINK_UP);
+		else
+			ndev->config.status &= cpu_to_mlx5vdpa16(mvdev, ~VIRTIO_NET_S_LINK_UP);
+	}
 
 	if (add_config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
 		memcpy(ndev->config.mac, add_config->net.mac, ETH_ALEN);
-	} else {
+	/* No bother setting mac address in config if not going to provision _F_MAC */
+	} else if ((add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) == 0 ||
+		   device_features & BIT_ULL(VIRTIO_NET_F_MAC)) {
 		err = mlx5_query_nic_vport_mac_address(mdev, 0, 0, config->mac);
 		if (err)
 			goto err_alloc;
@@ -3142,11 +3170,26 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
 		err = mlx5_mpfs_add_mac(pfmdev, config->mac);
 		if (err)
 			goto err_alloc;
-
-		ndev->mvdev.mlx_features |= BIT_ULL(VIRTIO_NET_F_MAC);
+	} else if ((add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) == 0) {
+		/*
+		 * We used to clear _F_MAC feature bit if seeing
+		 * zero mac address when device features are not
+		 * specifically provisioned. Keep the behaviour
+		 * so old scripts do not break.
+		 */
+		device_features &= ~BIT_ULL(VIRTIO_NET_F_MAC);
+	} else if (device_features & BIT_ULL(VIRTIO_NET_F_MAC)) {
+		/* Don't provision zero mac address for _F_MAC */
+		mlx5_vdpa_warn(&ndev->mvdev,
+			       "No mac address provisioned?\n");
+		err = -EINVAL;
+		goto err_alloc;
 	}
 
-	config->max_virtqueue_pairs = cpu_to_mlx5vdpa16(mvdev, max_vqs / 2);
+	if (device_features & BIT_ULL(VIRTIO_NET_F_MQ))
+		config->max_virtqueue_pairs = cpu_to_mlx5vdpa16(mvdev, max_vqs / 2);
+
+	ndev->mvdev.mlx_features = device_features;
 	mvdev->vdev.dma_dev = &mdev->pdev->dev;
 	err = mlx5_vdpa_alloc_resources(&ndev->mvdev);
 	if (err)
@@ -3243,7 +3286,8 @@ static int mlx5v_probe(struct auxiliary_device *adev,
 	mgtdev->mgtdev.id_table = id_table;
 	mgtdev->mgtdev.config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR) |
 					  BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP) |
-					  BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU);
+					  BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MTU) |
+					  BIT_ULL(VDPA_ATTR_DEV_FEATURES);
 	mgtdev->mgtdev.max_supported_vqs =
 		MLX5_CAP_DEV_VDPA_EMULATION(mdev, max_num_virtio_queues) + 1;
 	mgtdev->mgtdev.supported_features = get_supported_features(mdev);
-- 
1.8.3.1

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Re: [PATCH 0/6] features provisioning fixes and mlx5_vdpa support

[Si-Wei Liu]

Please disregard this series for v1, please refer to the v2 at:

Message-ID: 1675207345-22328-1-git-send-email-si-wei.liu@oracle.com

Apologies I accidentally got v1 resent at the same time when v2 was sent.

-Siwei

On 1/31/2023 3:22 PM, Si-Wei Liu wrote:
> You are currently receiving this informational message with the original email attached. We need your help in notifying the team or sender responsible for this mail flow to ensure future email is delivered properly.
>
> The host that sent this message is not compliant with Oracle's email security policy (DMARC). Please notify the person(s) responsible for this message and share the content below so they can take actions to resolve their issue.
>
> If you have no idea who is responsible, then please address the #ww-oracle-dmarc slack channel for assistance.
>
> Deadlines
> 	• We plan to move to quarantine non-compliant messages early 2023 (date to be determined).  After this date, if the issues are not fixed, messages will be held in a folder on our email gateway and will not be delivered to you.
> 	• We will then move to reject early 2023 (date to be determined).  After this date, messages will be rejected.
>
> For more technical resources and information, see:
> https://confluence.oci.oraclecorp.com/display/EMAIL/DMARC+for+Oracle+IT+and+Email+Delivery+Frequently+Asked+Questions
> https://confluence.oraclecorp.com/confluence/display/OITGLOBAL/DMARC+Global+FAQ
>
> Thank you in advance for your attention to this matter.
>
> ----------------------------------------------------------------------
> This patchset is pre-requisite to export and provision device
> config attributes and features for vdpa live migration, in a way
> backward and forward compatibility can be retained. The follow up
> work [1] will need to be built around the new feature provisioning
> uAPI, with which it's easier to formalize migration compatibility
> support at the driver level.
>
> Thanks,
> -Siwei
>
> [1] [PATCH v3 0/4] vDPA: initial config export via "vdpa dev show"
> https://lore.kernel.org/virtualization/1666392237-4042-1-git-send-email-si-wei.liu@oracle.com/
>
> ---
>
> Si-Wei Liu (6):
>    vdpa: fix improper error message when adding vdpa dev
>    vdpa: conditionally read STATUS in config space
>    vdpa: validate provisioned device features against specified attribute
>    virtio: VIRTIO_DEVICE_F_MASK for all per-device features
>    vdpa: validate device feature provisioning against supported class
>    vdpa/mlx5: support device features provisioning
>
>   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 72 ++++++++++++++++++++++------
>   drivers/vdpa/vdpa.c                | 98 ++++++++++++++++++++++++++++++++------
>   include/uapi/linux/virtio_config.h |  8 ++++
>   3 files changed, 149 insertions(+), 29 deletions(-)
>

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Re: [PATCH 0/6] features provisioning fixes and mlx5_vdpa support

[Si-Wei Liu]

Please disregard this series for v1, please refer to the v2 at:

Message-ID: 1675207345-22328-1-git-send-email-si-wei.liu@oracle.com

Apologies I accidentally got v1 resent at the same time when v2 was sent.

-Siwei

On 1/31/2023 3:22 PM, Si-Wei Liu wrote:
> You are currently receiving this informational message with the original email attached. We need your help in notifying the team or sender responsible for this mail flow to ensure future email is delivered properly.
>
> The host that sent this message is not compliant with Oracle's email security policy (DMARC). Please notify the person(s) responsible for this message and share the content below so they can take actions to resolve their issue.
>
> If you have no idea who is responsible, then please address the #ww-oracle-dmarc slack channel for assistance.
>
> Deadlines
> 	• We plan to move to quarantine non-compliant messages early 2023 (date to be determined).  After this date, if the issues are not fixed, messages will be held in a folder on our email gateway and will not be delivered to you.
> 	• We will then move to reject early 2023 (date to be determined).  After this date, messages will be rejected.
>
> For more technical resources and information, see:
> https://confluence.oci.oraclecorp.com/display/EMAIL/DMARC+for+Oracle+IT+and+Email+Delivery+Frequently+Asked+Questions
> https://confluence.oraclecorp.com/confluence/display/OITGLOBAL/DMARC+Global+FAQ
>
> Thank you in advance for your attention to this matter.
>
> ----------------------------------------------------------------------
> This patchset is pre-requisite to export and provision device
> config attributes and features for vdpa live migration, in a way
> backward and forward compatibility can be retained. The follow up
> work [1] will need to be built around the new feature provisioning
> uAPI, with which it's easier to formalize migration compatibility
> support at the driver level.
>
> Thanks,
> -Siwei
>
> [1] [PATCH v3 0/4] vDPA: initial config export via "vdpa dev show"
> https://lore.kernel.org/virtualization/1666392237-4042-1-git-send-email-si-wei.liu@oracle.com/
>
> ---
>
> Si-Wei Liu (6):
>    vdpa: fix improper error message when adding vdpa dev
>    vdpa: conditionally read STATUS in config space
>    vdpa: validate provisioned device features against specified attribute
>    virtio: VIRTIO_DEVICE_F_MASK for all per-device features
>    vdpa: validate device feature provisioning against supported class
>    vdpa/mlx5: support device features provisioning
>
>   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 72 ++++++++++++++++++++++------
>   drivers/vdpa/vdpa.c                | 98 ++++++++++++++++++++++++++++++++------
>   include/uapi/linux/virtio_config.h |  8 ++++
>   3 files changed, 149 insertions(+), 29 deletions(-)
>

Re: [PATCH 0/6] features provisioning fixes and mlx5_vdpa support

[Michael S. Tsirkin]

On Tue, Jan 31, 2023 at 03:22:01PM -0800, Si-Wei Liu wrote:
> This patchset is pre-requisite to export and provision device
> config attributes and features for vdpa live migration, in a way
> backward and forward compatibility can be retained. The follow up
> work [1] will need to be built around the new feature provisioning
> uAPI, with which it's easier to formalize migration compatibility
> support at the driver level.
> 
> Thanks,
> -Siwei
> 
> [1] [PATCH v3 0/4] vDPA: initial config export via "vdpa dev show"
> https://lore.kernel.org/virtualization/1666392237-4042-1-git-send-email-si-wei.liu@oracle.com/

1-6 look like bugfixes right?

> ---
> 
> Si-Wei Liu (6):
>   vdpa: fix improper error message when adding vdpa dev
>   vdpa: conditionally read STATUS in config space
>   vdpa: validate provisioned device features against specified attribute
>   virtio: VIRTIO_DEVICE_F_MASK for all per-device features
>   vdpa: validate device feature provisioning against supported class
>   vdpa/mlx5: support device features provisioning
> 
>  drivers/vdpa/mlx5/net/mlx5_vnet.c  | 72 ++++++++++++++++++++++------
>  drivers/vdpa/vdpa.c                | 98 ++++++++++++++++++++++++++++++++------
>  include/uapi/linux/virtio_config.h |  8 ++++
>  3 files changed, 149 insertions(+), 29 deletions(-)
> 
> -- 
> 1.8.3.1

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Re: [PATCH 0/6] features provisioning fixes and mlx5_vdpa support

[Michael S. Tsirkin]

On Tue, Jan 31, 2023 at 03:22:01PM -0800, Si-Wei Liu wrote:
> This patchset is pre-requisite to export and provision device
> config attributes and features for vdpa live migration, in a way
> backward and forward compatibility can be retained. The follow up
> work [1] will need to be built around the new feature provisioning
> uAPI, with which it's easier to formalize migration compatibility
> support at the driver level.
> 
> Thanks,
> -Siwei
> 
> [1] [PATCH v3 0/4] vDPA: initial config export via "vdpa dev show"
> https://lore.kernel.org/virtualization/1666392237-4042-1-git-send-email-si-wei.liu@oracle.com/

1-6 look like bugfixes right?

> ---
> 
> Si-Wei Liu (6):
>   vdpa: fix improper error message when adding vdpa dev
>   vdpa: conditionally read STATUS in config space
>   vdpa: validate provisioned device features against specified attribute
>   virtio: VIRTIO_DEVICE_F_MASK for all per-device features
>   vdpa: validate device feature provisioning against supported class
>   vdpa/mlx5: support device features provisioning
> 
>  drivers/vdpa/mlx5/net/mlx5_vnet.c  | 72 ++++++++++++++++++++++------
>  drivers/vdpa/vdpa.c                | 98 ++++++++++++++++++++++++++++++++------
>  include/uapi/linux/virtio_config.h |  8 ++++
>  3 files changed, 149 insertions(+), 29 deletions(-)
> 
> -- 
> 1.8.3.1

Re: [PATCH 0/6] features provisioning fixes and mlx5_vdpa support

[Si-Wei Liu]

On 2/2/2023 9:30 AM, Michael S. Tsirkin wrote:
> On Tue, Jan 31, 2023 at 03:22:01PM -0800, Si-Wei Liu wrote:
>> This patchset is pre-requisite to export and provision device
>> config attributes and features for vdpa live migration, in a way
>> backward and forward compatibility can be retained. The follow up
>> work [1] will need to be built around the new feature provisioning
>> uAPI, with which it's easier to formalize migration compatibility
>> support at the driver level.
>>
>> Thanks,
>> -Siwei
>>
>> [1] [PATCH v3 0/4] vDPA: initial config export via "vdpa dev show"
>> https://lore.kernel.org/virtualization/1666392237-4042-1-git-send-email-si-wei.liu@oracle.com/
> 1-6 look like bugfixes right?
1 and 2 are bug fixes, 3-5 you can say are bug fix for device_features, 
but they would lay the ground for standardizing device_features 
assumptions for drivers. Patch 6 is adding device_features to mlx5_vdpa 
as you can recognize.

(please match the corresponding patch in the v2 series)

Thanks,
-Siwei

>> ---
>>
>> Si-Wei Liu (6):
>>    vdpa: fix improper error message when adding vdpa dev
>>    vdpa: conditionally read STATUS in config space
>>    vdpa: validate provisioned device features against specified attribute
>>    virtio: VIRTIO_DEVICE_F_MASK for all per-device features
>>    vdpa: validate device feature provisioning against supported class
>>    vdpa/mlx5: support device features provisioning
>>
>>   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 72 ++++++++++++++++++++++------
>>   drivers/vdpa/vdpa.c                | 98 ++++++++++++++++++++++++++++++++------
>>   include/uapi/linux/virtio_config.h |  8 ++++
>>   3 files changed, 149 insertions(+), 29 deletions(-)
>>
>> -- 
>> 1.8.3.1

Re: [PATCH 0/6] features provisioning fixes and mlx5_vdpa support

[Si-Wei Liu]

On 2/2/2023 9:30 AM, Michael S. Tsirkin wrote:
> On Tue, Jan 31, 2023 at 03:22:01PM -0800, Si-Wei Liu wrote:
>> This patchset is pre-requisite to export and provision device
>> config attributes and features for vdpa live migration, in a way
>> backward and forward compatibility can be retained. The follow up
>> work [1] will need to be built around the new feature provisioning
>> uAPI, with which it's easier to formalize migration compatibility
>> support at the driver level.
>>
>> Thanks,
>> -Siwei
>>
>> [1] [PATCH v3 0/4] vDPA: initial config export via "vdpa dev show"
>> https://lore.kernel.org/virtualization/1666392237-4042-1-git-send-email-si-wei.liu@oracle.com/
> 1-6 look like bugfixes right?
1 and 2 are bug fixes, 3-5 you can say are bug fix for device_features, 
but they would lay the ground for standardizing device_features 
assumptions for drivers. Patch 6 is adding device_features to mlx5_vdpa 
as you can recognize.

(please match the corresponding patch in the v2 series)

Thanks,
-Siwei

>> ---
>>
>> Si-Wei Liu (6):
>>    vdpa: fix improper error message when adding vdpa dev
>>    vdpa: conditionally read STATUS in config space
>>    vdpa: validate provisioned device features against specified attribute
>>    virtio: VIRTIO_DEVICE_F_MASK for all per-device features
>>    vdpa: validate device feature provisioning against supported class
>>    vdpa/mlx5: support device features provisioning
>>
>>   drivers/vdpa/mlx5/net/mlx5_vnet.c  | 72 ++++++++++++++++++++++------
>>   drivers/vdpa/vdpa.c                | 98 ++++++++++++++++++++++++++++++++------
>>   include/uapi/linux/virtio_config.h |  8 ++++
>>   3 files changed, 149 insertions(+), 29 deletions(-)
>>
>> -- 
>> 1.8.3.1

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[PATCH 4/6] virtio: VIRTIO_DEVICE_F_MASK for all per-device features

[Si-Wei Liu]

Introduce VIRTIO_DEVICE_F_MASK bitmask used for identification
of per-device features. Feature bits VIRTIO_TRANSPORT_F_START
through VIRTIO_TRANSPORT_F_END are reserved for transport
features hence are not counted as per-device features against
the 64bit feature space.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 include/uapi/linux/virtio_config.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index 3c05162..3bdc7ed 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -54,6 +54,14 @@
 #define VIRTIO_TRANSPORT_F_START	28
 #define VIRTIO_TRANSPORT_F_END		41
 
+/*
+ * Bitmask for all per-device features: feature bits VIRTIO_TRANSPORT_F_START
+ * through VIRTIO_TRANSPORT_F_END are unset, i.e. 0xfffffc000fffffff for
+ * all 64bit features
+ */
+#define VIRTIO_DEVICE_F_MASK (~0ULL << (VIRTIO_TRANSPORT_F_END + 1) | \
+			      ((1ULL << VIRTIO_TRANSPORT_F_START) - 1))
+
 #ifndef VIRTIO_CONFIG_NO_LEGACY
 /* Do we get callbacks when the ring is completely used, even if we've
  * suppressed them? */
-- 
1.8.3.1

[PATCH 4/6] virtio: VIRTIO_DEVICE_F_MASK for all per-device features

[Si-Wei Liu]

Introduce VIRTIO_DEVICE_F_MASK bitmask used for identification
of per-device features. Feature bits VIRTIO_TRANSPORT_F_START
through VIRTIO_TRANSPORT_F_END are reserved for transport
features hence are not counted as per-device features against
the 64bit feature space.

Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
---
 include/uapi/linux/virtio_config.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index 3c05162..3bdc7ed 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -54,6 +54,14 @@
 #define VIRTIO_TRANSPORT_F_START	28
 #define VIRTIO_TRANSPORT_F_END		41
 
+/*
+ * Bitmask for all per-device features: feature bits VIRTIO_TRANSPORT_F_START
+ * through VIRTIO_TRANSPORT_F_END are unset, i.e. 0xfffffc000fffffff for
+ * all 64bit features
+ */
+#define VIRTIO_DEVICE_F_MASK (~0ULL << (VIRTIO_TRANSPORT_F_END + 1) | \
+			      ((1ULL << VIRTIO_TRANSPORT_F_START) - 1))
+
 #ifndef VIRTIO_CONFIG_NO_LEGACY
 /* Do we get callbacks when the ring is completely used, even if we've
  * suppressed them? */
-- 
1.8.3.1

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