This commit allows vDPA reporting topology information of
virtio-blk devices to user space, includes:
1) the number of logical blocks per physical block
2) offset of first aligned logical block
3) suggested minimum I/O size in blocks
4) optimal (suggested maximum) I/O size in blocks
Signed-off-by: Zhu Lingshan <lingshan.zhu@xxxxxxxxx>
---
drivers/vdpa/vdpa.c | 32 ++++++++++++++++++++++++++++++++
include/uapi/linux/vdpa.h | 4 ++++
2 files changed, 36 insertions(+)
diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
index 26e8768b869a..dfd9aa5779dc 100644
--- a/drivers/vdpa/vdpa.c
+++ b/drivers/vdpa/vdpa.c
@@ -1012,6 +1012,35 @@ static int vdpa_dev_blk_mq_config_fill(struct sk_buff *msg, u64 features,
return nla_put_u16(msg, VDPA_ATTR_DEV_BLK_CFG_NUM_QUEUES, val_u16);
}
+static int vdpa_dev_blk_topology_config_fill(struct sk_buff *msg, u64 features,
+ const struct virtio_blk_config *config)
+{
+ u16 min_io_size;
+ u32 opt_io_size;
+
+ if ((features & BIT_ULL(VIRTIO_BLK_F_TOPOLOGY)) == 0)
+ return 0;
+
+ min_io_size = __virtio16_to_cpu(true, config->min_io_size);
+ opt_io_size = __virtio32_to_cpu(true, config->opt_io_size);
+
+ if (nla_put_u8(msg, VDPA_ATTR_DEV_BLK_CFG_PHY_BLK_EXP,
+ config->physical_block_exp))
+ return -EMSGSIZE;
+
+ if (nla_put_u8(msg, VDPA_ATTR_DEV_BLK_CFG_ALIGN_OFFSET,
+ config->alignment_offset))
+ return -EMSGSIZE;
+
+ if (nla_put_u16(msg, VDPA_ATTR_DEV_BLK_CFG_MIN_IO_SIZE, min_io_size))
+ return -EMSGSIZE;
+
+ if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_OPT_IO_SIZE, opt_io_size))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
struct sk_buff *msg)
{
@@ -1041,6 +1070,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
if (vdpa_dev_blk_mq_config_fill(msg, features_device, &config))
return -EMSGSIZE;
+ if (vdpa_dev_blk_topology_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 3c8e3c87a864..5cc70614c97a 100644
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -61,6 +61,10 @@ enum vdpa_attr {
VDPA_ATTR_DEV_BLK_CFG_BLK_SIZE, /* u32 */
VDPA_ATTR_DEV_BLK_CFG_SEG_MAX, /* u32 */
VDPA_ATTR_DEV_BLK_CFG_NUM_QUEUES, /* u16 */
+ VDPA_ATTR_DEV_BLK_CFG_PHY_BLK_EXP, /* u8 */
+ VDPA_ATTR_DEV_BLK_CFG_ALIGN_OFFSET, /* u8 */
+ VDPA_ATTR_DEV_BLK_CFG_MIN_IO_SIZE, /* u16 */
+ VDPA_ATTR_DEV_BLK_CFG_OPT_IO_SIZE, /* u32 */
/* new attributes must be added above here */
VDPA_ATTR_MAX,
--
2.39.3
