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

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

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Message-Id: <20240218185606.13509-5-lingshan.zhu@intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2024-02-19 02:56:00 +08:00 committed by Michael S. Tsirkin
parent 3a1d33fb7e
commit 81f64e1d91
2 changed files with 18 additions and 0 deletions
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17
drivers/vdpa/vdpa.c
View file

@ -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;
}

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

@ -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,