linux-kernel - [PATCH v1 4/4] vduse: update the vq

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Date:   Wed, 11 Oct 2023 14:42:08 +0800
From:   Cindy Lu <lulu@...hat.com>
To:     lulu@...hat.com, jasowang@...hat.com, mst@...hat.com,
        xieyongji@...edance.com, linux-kernel@...r.kernel.org,
        maxime.coquelin@...hat.com
Subject: [PATCH v1 4/4] vduse: update the vq_info in ioctl

In VDUSE_VQ_GET_INFO, the driver will sync the last_avail_idx
with reconnect info, After mapping the reconnect pages to userspace
The userspace App will update the reconnect_time in
struct vhost_reconnect_vring, If this is not 0 then it means this
vq is reconnected and will update the last_avail_idx

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 0f15e7ac716b..42e7a90ab74c 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -1213,6 +1213,9 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
 		struct vduse_vq_info vq_info;
 		struct vduse_virtqueue *vq;
 		u32 index;
+		struct vdpa_reconnect_info *area;
+		struct vhost_reconnect_vring *vq_reconnect;
+		struct vhost_reconnect_data *dev_reconnect;
 
 		ret = -EFAULT;
 		if (copy_from_user(&vq_info, argp, sizeof(vq_info)))
@@ -1244,6 +1247,19 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
 
 		vq_info.ready = vq->ready;
 
+		area = &dev->reconnect_status;
+		dev_reconnect = (struct vhost_reconnect_data *)area->vaddr;
+
+		area = &vq->reconnect_info;
+		vq_reconnect = (struct vhost_reconnect_vring *)area->vaddr;
+		/*check if the vq is reconnect, if yes then update the last_avail_idx*/
+		if ((vq_reconnect->last_avail_idx !=
+		     vq_info.split.avail_index) &&
+		    (dev_reconnect->reconnect_time != 0)) {
+			vq_info.split.avail_index =
+				vq_reconnect->last_avail_idx;
+		}
+
 		ret = -EFAULT;
 		if (copy_to_user(argp, &vq_info, sizeof(vq_info)))
 			break;
-- 
2.34.3