[PATCH 02/10] vDPA: report virtio-block max segment size to user space

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This commit allows reporting the max size of any
single segment of virtio-block devices to user space.

Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
---
 drivers/vdpa/vdpa.c       | 17 +++++++++++++++++
 include/uapi/linux/vdpa.h |  1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index d5ccb618de2b..ee1472d32b0d 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -956,6 +956,20 @@ vdpa_dev_blk_capacity_config_fill(struct sk_buff *msg,
 				 val_u64, VDPA_ATTR_PAD);
 }
 
+static int
+vdpa_dev_blk_seg_size_config_fill(struct sk_buff *msg, u64 features,
+				  const struct virtio_blk_config *config)
+{
+	u32 val_u32;
+
+	if ((features & BIT_ULL(VIRTIO_BLK_F_SIZE_MAX)) == 0)
+		return 0;
+
+	val_u32 = __virtio32_to_cpu(true, config->size_max);
+
+	return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_SEG_SIZE, val_u32);
+}
+
 static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
 				    struct sk_buff *msg)
 {
@@ -973,6 +987,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
 	if (vdpa_dev_blk_capacity_config_fill(msg, &config))
 		return -EMSGSIZE;
 
+	if (vdpa_dev_blk_seg_size_config_fill(msg, features_device, &config))
+		return -EMSGSIZE;
+
 	return 0;
 }
 
diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 1bf69226cb96..586bce3c906a 100644
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -57,6 +57,7 @@ enum vdpa_attr {
 	VDPA_ATTR_DEV_FEATURES,                 /* u64 */
 
 	VDPA_ATTR_DEV_BLK_CFG_CAPACITY,		/* u64 */
+	VDPA_ATTR_DEV_BLK_CFG_SEG_SIZE,		/* u32 */
 
 	/* new attributes must be added above here */
 	VDPA_ATTR_MAX,
-- 
2.39.3





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