Commit 6bdc7846 authored by Zhu Lingshan's avatar Zhu Lingshan Committed by Michael S. Tsirkin
Browse files

vDPA: report virtio-block write zeroes configuration to user space 



This commits reports write zeroes configuration of
virtio-block devices to user space, includes:
1)maximum write zeroes sectors size
2)maximum write zeroes segment number

Signed-off-by: default avatarZhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20240218185606.13509-9-lingshan.zhu@intel.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 65848f46

drivers/vdpa/vdpa.c

+23 −0
Original line number Diff line number Diff line
@@ -1064,6 +1064,26 @@ static int vdpa_dev_blk_discard_config_fill(struct sk_buff *msg, u64 features, 
	return 0;

}



static int

vdpa_dev_blk_write_zeroes_config_fill(struct sk_buff *msg, u64 features,

				     const struct virtio_blk_config *config)

{

	u32 val_u32;



	if ((features & BIT_ULL(VIRTIO_BLK_F_WRITE_ZEROES)) == 0)

		return 0;



	val_u32 = __virtio32_to_cpu(true, config->max_write_zeroes_sectors);

	if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEC, val_u32))

		return -EMSGSIZE;



	val_u32 = __virtio32_to_cpu(true, config->max_write_zeroes_seg);

	if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEG, val_u32))

		return -EMSGSIZE;



	return 0;

}



static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,

				    struct sk_buff *msg)

{
@@ -1099,6 +1119,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev, 
	if (vdpa_dev_blk_discard_config_fill(msg, features_device, &config))

		return -EMSGSIZE;



	if (vdpa_dev_blk_write_zeroes_config_fill(msg, features_device, &config))

		return -EMSGSIZE;



	return 0;

}

include/uapi/linux/vdpa.h

+2 −0
Original line number Diff line number Diff line
@@ -68,6 +68,8 @@ enum vdpa_attr { 
	VDPA_ATTR_DEV_BLK_CFG_MAX_DISCARD_SEC,	/* u32 */

	VDPA_ATTR_DEV_BLK_CFG_MAX_DISCARD_SEG,	/* u32 */

	VDPA_ATTR_DEV_BLK_CFG_DISCARD_SEC_ALIGN,/* u32 */

	VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEC,	/* u32 */

	VDPA_ATTR_DEV_BLK_CFG_MAX_WRITE_ZEROES_SEG,	/* u32 */



	/* new attributes must be added above here */

	VDPA_ATTR_MAX,