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| -rw-r--r-- | content.tex | 41 |
1 files changed, 37 insertions, 4 deletions
diff --git a/content.tex b/content.tex index a745599..7e88411 100644 --- a/content.tex +++ b/content.tex @@ -4420,6 +4420,9 @@ This section relies on definitions from \hyperref[intro:SAM]{SAM}. \item[VIRTIO_SCSI_F_CHANGE (2)] The host will report changes to LUN parameters via a VIRTIO_SCSI_T_PARAM_CHANGE event. + +\item[VIRTIO_SCSI_F_T10_PI (3)] The extended fields for T10 protection + information (DIF/DIX) are included in the SCSI request header. \end{description} \subsection{Device configuration layout}\label{sec:Device Types / SCSI Host Device / Device configuration layout} @@ -4532,7 +4535,12 @@ struct virtio_scsi_req_cmd { u8 prio; u8 crn; u8 cdb[cdb_size]; + // The next two fields are only present if VIRTIO_SCSI_F_T10_PI + // is negotiated. + u32 pi_bytesout; + u8 pi_out[pi_bytesout]; u8 dataout[]; + // Device-writable part le32 sense_len; le32 residual; @@ -4540,6 +4548,10 @@ struct virtio_scsi_req_cmd { u8 status; u8 response; u8 sense[sense_size]; + // The next two fields are only present if VIRTIO_SCSI_F_T10_PI + // is negotiated + u32 pi_bytesin; + u8 pi_in[pi_bytesin]; u8 datain[]; }; @@ -4580,13 +4592,25 @@ by clients, but is generally expected to be 0. The maximum CRN value defined by the protocol is 255, since CRN is stored in an 8-bit integer. -All of these fields are defined in \hyperref[intro:SAM]{SAM}. They are always -device-readable, as are \field{cdb} and \field{dataout}. \field{cdb_size} is -taken from the configuration space. +The CDB is included in \field{cdb} and its size, \field{cdb_size}, +is taken from the configuration space. + +All of these fields are defined in \hyperref[intro:SAM]{SAM} and are +always device-readable. + +\field{pi_bytesout} determines the size of the \field{pi_out} field +in bytes. If it is nonzero, the \field{pi_out} field contains outgoing +protection information for write operations. Both fields are only +present if VIRTIO_SCSI_F_T10_PI has been negotiated. + +The remainder of the device-readable part is the data output buffer, +\field{dataout}. \field{sense} and subsequent fields are always device-writable. \field{sense_len} indicates the number of bytes actually written to the sense -buffer. \field{residual} indicates the residual size, +buffer. + +\field{residual} indicates the residual size, calculated as ``data_length - number_of_transferred_bytes'', for read or write operations. For bidirectional commands, the number_of_transferred_bytes includes both read and written bytes. @@ -4596,6 +4620,15 @@ exceeds the size of \field{datain} means that \field{dataout} was processed partially and \field{datain} was not processed at all. +\field{pi_bytesin} determines the size of the \field{pi_in} field +in bytes. If it is nonzero, the \field{pi_in} field contains incoming +protection information for read operations. Both fields are only present +if VIRTIO_SCSI_F_T10_PI has been negotiated. + +The remainder of the device-writable part is the data input buffer, +\field{datain}. + + \devicenormative{\paragraph}{Device Operation: Request Queues}{Device Types / SCSI Host Device / Device Operation / Device Operation: Request Queues} The device MUST write the \field{status} byte as the status code as |