vDPA: report virtio-blk flush info to user space

This commit reports whether a virtio-blk device
support cache flush command to user space

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20240218185606.13509-11-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 2d02ea60af0c18af33861cef5a3d6dbb23c2d191..b246067e074bc0718ad49ad582b3ad9e382c9af0 100644 (file)
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -1095,6 +1095,17 @@ static int vdpa_dev_blk_ro_config_fill(struct sk_buff *msg, u64 features)
        return 0;
 }
 
+static int vdpa_dev_blk_flush_config_fill(struct sk_buff *msg, u64 features)
+{
+       u8 flush;
+
+       flush = ((features & BIT_ULL(VIRTIO_BLK_F_FLUSH)) == 0) ? 0 : 1;
+       if (nla_put_u8(msg, VDPA_ATTR_DEV_BLK_CFG_FLUSH, flush))
+               return -EMSGSIZE;
+
+       return 0;
+}
+
 static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
                                    struct sk_buff *msg)
 {
@@ -1136,6 +1147,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
        if (vdpa_dev_blk_ro_config_fill(msg, features_device))
                return -EMSGSIZE;
 
+       if (vdpa_dev_blk_flush_config_fill(msg, features_device))
+               return -EMSGSIZE;
+
        return 0;
 }
 

diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 4be8e3a1587413053246c27e10ba18f06a38769a..43c51698195ceb0619e5b2787428be675b007a7f 100644 (file)
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -71,6 +71,7 @@ enum vdpa_attr {
        VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEC,     /* u32 */
        VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEG,     /* u32 */
        VDPA_ATTR_DEV_BLK_CFG_READ_ONLY,                /* u8 */
+       VDPA_ATTR_DEV_BLK_CFG_FLUSH,            /* u8 */
 
        /* new attributes must be added above here */
        VDPA_ATTR_MAX,