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Subject: [OASIS Issue Tracker] (VIRTIO-181) virtio_blk_req.data size - Section 5.2.6 - version 1.1 draft 01


     [ https://issues.oasis-open.org/browse/VIRTIO-181?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael S. Tsirkin updated VIRTIO-181:
--------------------------------------
    Resolution: 
This is a duplicate report that was resolved as part of resolution of
https://github.com/oasis-tcs/virtio-spec/issues/32
bef3ff7 virtio-blk: document data[] size constraints

  was:
This is a duplicate report that was resolved as part of resolution of
https://github.com/oasis-tcs/virtio-spec/issues/34
bef3ff7 virtio-blk: document data[] size constraints


> virtio_blk_req.data size - Section 5.2.6 - version 1.1 draft 01
> ---------------------------------------------------------------
>
>                 Key: VIRTIO-181
>                 URL: https://issues.oasis-open.org/browse/VIRTIO-181
>             Project: OASIS Virtual I/O Device (VIRTIO) TC
>          Issue Type: Bug
>    Affects Versions: virtio 1.1 csprd01
>         Environment: "Savir, Gil" <gil.savir@intel.com>
>            Reporter: Michael S. Tsirkin
>            Priority: Major
>             Fix For: virtio 1.1 cs01
>
>
> In version 1.1 draft 01 - Section 5.2.6 - struct virtio_blk_req definition:
> Data field is defined as array of 512 Byte entries as follows:
>         u8 data[][512];
> It makes sense for IN and OUT requests, since defined for read/write sizes that are 512 Bytes multiplication.
> However, it is confusing when used for DISCARD or WRITE_ZEROES requests, since virtio_blk_discard_write_zeroes struct size is 16
> +Bytes.
> Is implying that DISCARD and WRITE_ZEROES requests must use data-field sizes that are 512 Bytes multiplication as well?
> If yes, than the device can't tell how many virtio_blk_discard_write_zeroes structs reside within data-field. In that case -
> +indication for number of virtio_blk_discard_write_zeroes structs needs to be added.



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