https://community.nxp.com/t5/Layerscape/Linux-QBMan-QMan-driver-safe-copy-dqrr/m-p/2398316#M16792 <P>The Linux SDK for QorIQ processors includes <A href="https://github.com/nxp-qoriq/linux/blob/lf-6.12.y/drivers/staging/fsl_qbman/qman_high.c" target="_blank" rel="noopener">qman_high.c</A> in the driver staging tree. This includes the function safe_copy_dqrr(), which the comments say is&nbsp;<EM>ensuring reads reach QBMan in order</EM> and //preventing a WRAP transaction to be seen by the QBMan//.<BR /><BR />I presume this is referring to an AXI WRAP burst transaction, rather than anything to do with the DQRR index wrap.<BR /><BR />Can anyone explain why this is problem that needs to be made safe?<BR /><BR />Thanks in advance.</P> Thu, 23 Jul 2026 12:21:47 GMT tim8 2026-07-23T12:21:47Z https://community.nxp.com/t5/Layerscape/Linux-QBMan-QMan-driver-safe-copy-dqrr/m-p/2398316#M16792 <P>The Linux SDK for QorIQ processors includes <A href="https://github.com/nxp-qoriq/linux/blob/lf-6.12.y/drivers/staging/fsl_qbman/qman_high.c" target="_blank" rel="noopener">qman_high.c</A> in the driver staging tree. This includes the function safe_copy_dqrr(), which the comments say is&nbsp;<EM>ensuring reads reach QBMan in order</EM> and //preventing a WRAP transaction to be seen by the QBMan//.<BR /><BR />I presume this is referring to an AXI WRAP burst transaction, rather than anything to do with the DQRR index wrap.<BR /><BR />Can anyone explain why this is problem that needs to be made safe?<BR /><BR />Thanks in advance.</P> Thu, 23 Jul 2026 12:21:47 GMT https://community.nxp.com/t5/Layerscape/Linux-QBMan-QMan-driver-safe-copy-dqrr/m-p/2398316#M16792 tim8 2026-07-23T12:21:47Z