Hey All,
Recently, iSER end-to-end T10-PI support maid it mainline.
I am wandering about the impact T10-PI should or shouldn't have on iSCSI
header
field "Expected Data Transfer Length".
RFC-7143 states:
"the Expected Data Transfer Length field contains the number of bytes of
data involved in this SCSI operation."
Since this field relates to *data bytes* I kept T10-PI implicit wrt this
field. The iSCSI target calculates the
total transfer length (data + protection) from the cdb transfer length
field and protect bits.
In FC, the fc_dl field was updated to relate to the total number of
transfer bytes and includes
data and protection bytes. virtio_scsi was added with a header PI
section (virtio_scsi_cmd_req_pi).
So my question is, should this field be updated to explicitly include
T10-PI bytes like the FC equivalent fc_dl?
Or should T10-PI bytes be implicit?
I want to pin down this one to avoid a situation where the standard is
open for interpretations.
Thanks,
Sagi.
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