vDPA: report virtio-block max segments in a request to user space

[linux-2.6-microblaze.git] / drivers / vdpa / vdpa.c

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index d96dc2a..3e3c84b 100644 (file)
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -985,6 +985,20 @@ vdpa_dev_blk_block_size_config_fill(struct sk_buff *msg, u64 features,
        return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_BLK_SIZE, val_u32);
 }
 
+static int
+vdpa_dev_blk_seg_max_config_fill(struct sk_buff *msg, u64 features,
+                                const struct virtio_blk_config *config)
+{
+       u32 val_u32;
+
+       if ((features & BIT_ULL(VIRTIO_BLK_F_SEG_MAX)) == 0)
+               return 0;
+
+       val_u32 = __virtio32_to_cpu(true, config->seg_max);
+
+       return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_SEG_MAX, val_u32);
+}
+
 static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
                                    struct sk_buff *msg)
 {
@@ -1008,6 +1022,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
        if (vdpa_dev_blk_block_size_config_fill(msg, features_device, &config))
                return -EMSGSIZE;
 
+       if (vdpa_dev_blk_seg_max_config_fill(msg, features_device, &config))
+               return -EMSGSIZE;
+
        return 0;
 }