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vDPA: report virtio-block max segment size to user space

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This commit allows reporting the max size of any
single segment of virtio-block devices to user space.

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20240218185606.13509-3-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2024-02-19 02:55:58 +08:00 committed by Michael S. Tsirkin
parent c2475a9a78
commit 330b8aea69
2 changed files with 18 additions and 0 deletions
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17
drivers/vdpa/vdpa.c
View file

@ -956,6 +956,20 @@ vdpa_dev_blk_capacity_config_fill(struct sk_buff *msg,
val_u64, VDPA_ATTR_PAD);
}
static int
vdpa_dev_blk_seg_size_config_fill(struct sk_buff *msg, u64 features,
const struct virtio_blk_config *config)
{
u32 val_u32;
if ((features & BIT_ULL(VIRTIO_BLK_F_SIZE_MAX)) == 0)
return 0;
val_u32 = __virtio32_to_cpu(true, config->size_max);
return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_SEG_SIZE, val_u32);
}
static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
struct sk_buff *msg)
{
@ -973,6 +987,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
if (vdpa_dev_blk_capacity_config_fill(msg, &config))
return -EMSGSIZE;
if (vdpa_dev_blk_seg_size_config_fill(msg, features_device, &config))
return -EMSGSIZE;
return 0;
}

1
include/uapi/linux/vdpa.h
View file

@ -57,6 +57,7 @@ enum vdpa_attr {
VDPA_ATTR_DEV_FEATURES, /* u64 */
VDPA_ATTR_DEV_BLK_CFG_CAPACITY, /* u64 */
VDPA_ATTR_DEV_BLK_CFG_SEG_SIZE, /* u32 */
/* new attributes must be added above here */
VDPA_ATTR_MAX,