Commit 81f64e1d authored by Zhu Lingshan's avatar Zhu Lingshan Committed by Michael S. Tsirkin
Browse files

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



This commit allows vDPA reporting the maximum number of
segments in a request of virtio-block devices to
user space.

Signed-off-by: default avatarZhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20240218185606.13509-5-lingshan.zhu@intel.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 3a1d33fb

drivers/vdpa/vdpa.c

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

}

include/uapi/linux/vdpa.h

+1 −0
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ enum vdpa_attr { 
	VDPA_ATTR_DEV_BLK_CFG_CAPACITY,		/* u64 */

	VDPA_ATTR_DEV_BLK_CFG_SEG_SIZE,		/* u32 */

	VDPA_ATTR_DEV_BLK_CFG_BLK_SIZE,		/* u32 */

	VDPA_ATTR_DEV_BLK_CFG_SEG_MAX,		/* u32 */



	/* new attributes must be added above here */

	VDPA_ATTR_MAX,