7efce2e59c
Implement EXT_SCSI_PASS_THRU.GetNextTarget() and EXT_SCSI_PASS_THRU.GetNextTargetLun(). ScsiBusDxe scans all MaxTarget * MaxLun possible devices. This can take unnecessarily long for large number of targets. To deal with this, VirtioScsiDxe has defined PCDs to limit the MaxTarget & MaxLun to desired values which gives sufficient performance. It is very important in virtio-scsi as it can have very big MaxTarget & MaxLun. Even though a common PVSCSI device has a default MaxTarget=64 and MaxLun=0, we implement similar mechanism as virtio-scsi for completeness. This may be useful in the future when PVSCSI will have bigger values for MaxTarget and MaxLun. Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2567 Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Liran Alon <liran.alon@oracle.com> Message-Id: <20200328200100.60786-7-liran.alon@oracle.com> Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>