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vDPA: report virtio-block discarding configuration to user space

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This commit reports virtio-blk discarding configuration
to user space,includes:
1) the maximum discard sectors
2) maximum number of discard segments for the block driver to use
3) the alignment for splitting a discarding request

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20240218185606.13509-8-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2024-02-19 02:56:03 +08:00 committed by Michael S. Tsirkin
parent c9d989b4ab
commit 65848f46e1
2 changed files with 29 additions and 0 deletions
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26
drivers/vdpa/vdpa.c
View file

@ -1041,6 +1041,29 @@ static int vdpa_dev_blk_topology_config_fill(struct sk_buff *msg, u64 features,
return 0;
}
static int vdpa_dev_blk_discard_config_fill(struct sk_buff *msg, u64 features,
const struct virtio_blk_config *config)
{
u32 val_u32;
if ((features & BIT_ULL(VIRTIO_BLK_F_DISCARD)) == 0)
return 0;
val_u32 = __virtio32_to_cpu(true, config->max_discard_sectors);
if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_MAX_DISCARD_SEC, val_u32))
return -EMSGSIZE;
val_u32 = __virtio32_to_cpu(true, config->max_discard_seg);
if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_MAX_DISCARD_SEG, val_u32))
return -EMSGSIZE;
val_u32 = __virtio32_to_cpu(true, config->discard_sector_alignment);
if (nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_DISCARD_SEC_ALIGN, val_u32))
return -EMSGSIZE;
return 0;
}
static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
struct sk_buff *msg)
{
@ -1073,6 +1096,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
if (vdpa_dev_blk_topology_config_fill(msg, features_device, &config))
return -EMSGSIZE;
if (vdpa_dev_blk_discard_config_fill(msg, features_device, &config))
return -EMSGSIZE;
return 0;
}

3
include/uapi/linux/vdpa.h
View file

@ -65,6 +65,9 @@ enum vdpa_attr {
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 */
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 */
/* new attributes must be added above here */
VDPA_ATTR_MAX,