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vDPA: report virtio-block topology info to user space

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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@intel.com>
Message-Id: <20240218185606.13509-7-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2024-02-19 02:56:02 +08:00 committed by Michael S. Tsirkin
parent 54fb04b02e
commit c9d989b4ab
2 changed files with 36 additions and 0 deletions
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32
drivers/vdpa/vdpa.c
View file

@ -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;
}

4
include/uapi/linux/vdpa.h
View file

@ -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,