[CI-NO-BUILD] [vioscsi] Programmatically determine max_segments #1306
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Waiting on PR #1216 to merge before rebasing and review. |
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Refactors VioScsiFindAdapter() to:
1. Use new mnemonic adaptExt->max_segments to replace adaptExt->max_physical_breaks
(also used in the VioScsiBuildIo() and VioScsiReadExtendedData() functions)
2. Enable Registry lookup for max_segments in neo value "MaxPhysicalSegments" or
the legacy value "PhysicalBreaks". New value defined by REGISTRY_MAX_PH_SEGMENTS.
3. Also derive max_segments from adaptExt->scsi_config.seg_max and also from
the adaptExt->scsi_config.max_sectors value
4. Choose from among best candidates and check within limits
5. Enforce legacy StorPort NOPB off-by-one behaviour and provide explanation
6. Improves relevant instrumentation
7. Use new mnemonic PHYS_SEGMENTS_LIMIT to replace MAX_PHYS_SEGMENTS
8. Update VIRTIO_MAX_SG to (PHYS_SEGMENTS_LIMIT + 1)
9. Update VIRTIO_SCSI_QUEUE_LAST to (MAX_CPU - VIRTIO_SCSI_REQUEST_QUEUE_0)
10. Removed max_segments increment from calculation of sgMaxElements in VioScsiBuildIo()
Note: This commit enables the use of max_segments greater than
adaptExt->scsi_config.seg_max (max = 254) up to
PHYS_SEGMENTS_LIMIT (presently 512).
Signed-off-by: benyamin-codez <[email protected]>
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Refactors
VioScsiFindAdapter()to:adaptExt->max_segmentsto replaceadaptExt->max_physical_breaks(also used in theVioScsiBuildIo()andVioScsiReadExtendedData()functions)max_segmentsin neo value "MaxPhysicalSegments" or the legacy value "PhysicalBreaks". New value defined byREGISTRY_MAX_PH_SEGMENTS.max_segmentsfromadaptExt->scsi_config.seg_maxand from theadaptExt->scsi_config.max_sectorsvaluePHYS_SEGMENTS_LIMITto replaceMAX_PHYS_SEGMENTSVIRTIO_MAX_SGto(PHYS_SEGMENTS_LIMIT + 1)VIRTIO_SCSI_QUEUE_LASTto(MAX_CPU - VIRTIO_SCSI_REQUEST_QUEUE_0)max_segmentsincrement from calculation ofsgMaxElementsinVioScsiBuildIo()Note: This commit enables the use of max_segments greater than
adaptExt->scsi_config.seg_max(max = 254) up toPHYS_SEGMENTS_LIMIT(presently 512). PR #1316 increases this value to 1,022.