linux-kernel - [PATCH v7 3/3] vduse: enable Virtio-net device type

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Date: Tue,  9 Jan 2024 12:10:25 +0100
From: Maxime Coquelin <maxime.coquelin@...hat.com>
To: mst@...hat.com,
	jasowang@...hat.com,
	xuanzhuo@...ux.alibaba.com,
	xieyongji@...edance.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	david.marchand@...hat.com,
	lulu@...hat.com
Cc: Maxime Coquelin <maxime.coquelin@...hat.com>,
	Eugenio Pérez <eperezma@...hat.com>
Subject: [PATCH v7 3/3] vduse: enable Virtio-net device type

This patch adds Virtio-net device type to the supported
devices types.

Initialization fails if the device does not support
VIRTIO_F_VERSION_1 feature, in order to guarantee the
configuration space is read-only. It also fails with
-EPERM if the CAP_NET_ADMIN is missing.

Acked-by: Jason Wang <jasowang@...hat.com>
Reviewed-by: Eugenio Pérez <eperezma@...hat.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@...hat.com>
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 00f3f562ab5d..8924bbc55635 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -143,6 +143,7 @@ static struct workqueue_struct *vduse_irq_bound_wq;
 
 static u32 allowed_device_id[] = {
 	VIRTIO_ID_BLOCK,
+	VIRTIO_ID_NET,
 };
 
 static inline struct vduse_dev *vdpa_to_vduse(struct vdpa_device *vdpa)
@@ -1686,6 +1687,10 @@ static bool features_is_valid(struct vduse_dev_config *config)
 			(config->features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ)))
 		return false;
 
+	if ((config->device_id == VIRTIO_ID_NET) &&
+			!(config->features & BIT_ULL(VIRTIO_F_VERSION_1)))
+		return false;
+
 	return true;
 }
 
@@ -1793,6 +1798,10 @@ static int vduse_create_dev(struct vduse_dev_config *config,
 	int ret;
 	struct vduse_dev *dev;
 
+	ret = -EPERM;
+	if ((config->device_id == VIRTIO_ID_NET) && !capable(CAP_NET_ADMIN))
+		goto err;
+
 	ret = -EEXIST;
 	if (vduse_find_dev(config->name))
 		goto err;
@@ -2036,6 +2045,7 @@ static const struct vdpa_mgmtdev_ops vdpa_dev_mgmtdev_ops = {
 
 static struct virtio_device_id id_table[] = {
 	{ VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
+	{ VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
 	{ 0 },
 };
 
-- 
2.43.0