netdev - [RFC 3/6] vDPA/ifcvf: support userspace to query device feature bits

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Message-Id: <20220513083935.1253031-4-lingshan.zhu@intel.com>
Date:   Fri, 13 May 2022 16:39:32 +0800
From:   Zhu Lingshan <lingshan.zhu@...el.com>
To:     jasowang@...hat.com, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [RFC 3/6] vDPA/ifcvf: support userspace to query device feature bits

This commit supports userspace to query device feature bits
by filling the relevant netlink attribute.

There are two types of netlink attributes:
VDPA_ATTR_DEV_XXXX work for virtio devices config space, and
VDPA_ATTR_MGMTDEV_XXXX work for the management devices.

This commit fixes a misuse of VDPA_ATTR_DEV_SUPPORTED_FEATURES,
this attr is for a virtio device, not management devices.

Thus VDPA_ATTR_MGMTDEV_SUPPORTED_FEATURES is introduced for
reporting management device features, and VDPA_ATTR_DEV_SUPPORTED_FEATURES
for virtio devices feature bits.

Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
---
 drivers/vdpa/vdpa.c       | 15 ++++++++++-----
 include/uapi/linux/vdpa.h |  1 +
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 2b75c00b1005..c820dd2b0307 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -508,7 +508,7 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m
 		err = -EMSGSIZE;
 		goto msg_err;
 	}
-	if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_SUPPORTED_FEATURES,
+	if (nla_put_u64_64bit(msg, VDPA_ATTR_MGMTDEV_SUPPORTED_FEATURES,
 			      mdev->supported_features, VDPA_ATTR_PAD)) {
 		err = -EMSGSIZE;
 		goto msg_err;
@@ -827,7 +827,7 @@ static int vdpa_dev_net_mq_config_fill(struct vdpa_device *vdev,
 static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
 {
 	struct virtio_net_config config = {};
-	u64 features;
+	u64 features_device, features_driver;
 	u16 val_u16;
 
 	vdpa_get_config_unlocked(vdev, 0, &config, sizeof(config));
@@ -844,12 +844,17 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
 	if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
 		return -EMSGSIZE;
 
-	features = vdev->config->get_driver_features(vdev);
-	if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features,
+	features_driver = vdev->config->get_driver_features(vdev);
+	if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver,
 			      VDPA_ATTR_PAD))
 		return -EMSGSIZE;
 
-	return vdpa_dev_net_mq_config_fill(vdev, msg, features, &config);
+	features_device = vdev->config->get_device_features(vdev);
+	if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_SUPPORTED_FEATURES, features_device,
+			      VDPA_ATTR_PAD))
+		return -EMSGSIZE;
+
+	return vdpa_dev_net_mq_config_fill(vdev, msg, features_device, &config);
 }
 
 static int
diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 1061d8d2d09d..70a3672c288f 100644
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -30,6 +30,7 @@ enum vdpa_attr {
 	VDPA_ATTR_MGMTDEV_BUS_NAME,		/* string */
 	VDPA_ATTR_MGMTDEV_DEV_NAME,		/* string */
 	VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES,	/* u64 */
+	VDPA_ATTR_MGMTDEV_SUPPORTED_FEATURES,	/* u64 */
 
 	VDPA_ATTR_DEV_NAME,			/* string */
 	VDPA_ATTR_DEV_ID,			/* u32 */
-- 
2.31.1