Commit 330b8aea authored by Zhu Lingshan's avatar Zhu Lingshan Committed by Michael S. Tsirkin
Browse files

vDPA: report virtio-block max segment size to user space 



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

Signed-off-by: default avatarZhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20240218185606.13509-3-lingshan.zhu@intel.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent c2475a9a

drivers/vdpa/vdpa.c

+17 −0
Original line number Diff line number Diff line
@@ -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;

}

include/uapi/linux/vdpa.h

+1 −0
Original line number Diff line number Diff line
@@ -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,