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vDPA: report virtio-block max segment size to user space
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>
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@ -956,6 +956,20 @@ vdpa_dev_blk_capacity_config_fill(struct sk_buff *msg,
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val_u64, VDPA_ATTR_PAD);
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}
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static int
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vdpa_dev_blk_seg_size_config_fill(struct sk_buff *msg, u64 features,
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const struct virtio_blk_config *config)
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{
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u32 val_u32;
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if ((features & BIT_ULL(VIRTIO_BLK_F_SIZE_MAX)) == 0)
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return 0;
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val_u32 = __virtio32_to_cpu(true, config->size_max);
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return nla_put_u32(msg, VDPA_ATTR_DEV_BLK_CFG_SEG_SIZE, val_u32);
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}
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static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
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struct sk_buff *msg)
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{
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@ -973,6 +987,9 @@ static int vdpa_dev_blk_config_fill(struct vdpa_device *vdev,
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if (vdpa_dev_blk_capacity_config_fill(msg, &config))
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return -EMSGSIZE;
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if (vdpa_dev_blk_seg_size_config_fill(msg, features_device, &config))
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return -EMSGSIZE;
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return 0;
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}
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@ -57,6 +57,7 @@ enum vdpa_attr {
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VDPA_ATTR_DEV_FEATURES, /* u64 */
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VDPA_ATTR_DEV_BLK_CFG_CAPACITY, /* u64 */
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VDPA_ATTR_DEV_BLK_CFG_SEG_SIZE, /* u32 */
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/* new attributes must be added above here */
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VDPA_ATTR_MAX,
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