diff mbox series

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

Message ID 1675110643-28143-6-git-send-email-si-wei.liu@oracle.com
State New
Headers
Series features provisioning fixes and mlx5_vdpa support |

Commit Message

Si-Wei Liu Jan. 30, 2023, 8:30 p.m. UTC 
  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 mbox series

Patch

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);