Scatter gather list in SCSI miniport driver
in [Device Drivers]
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From: Maxim S. Shatskih on 2 Mar 2010 02:02 >so whatever i understood is, SCSIport will send only single entry to >miniport and each entry by entry i have to transfer using DMA, unlike >the ATA driver it can't send all entrys at a time.? No. SCSIPORT creates the SGL (associated with the IRP/SRB) and keeps it internally. If you need to enumerate the SGL - call ScsiPortGetPhysicalAddress in a loop, it will give you entry after entry. Same logic as with explicit SGL, since you will also need to enumerate it to translate to your hardware's format. -- Maxim S. Shatskih Windows DDK MVP maxim(a)storagecraft.com http://www.storagecraft.com
From: hitesh on 2 Mar 2010 03:18
On Mar 2, 12:02 pm, "Maxim S. Shatskih" <ma...(a)storagecraft.com.no.spam> wrote: > >so whatever i understood is, SCSIport will send only single entry to > >miniport and each entry by entry i have to transfer using DMA, unlike > >the ATA driver it can't send all entrys at a time.? > > No. > > SCSIPORT creates the SGL (associated with the IRP/SRB) and keeps it internally. > > If you need to enumerate the SGL - call ScsiPortGetPhysicalAddress in a loop, it will give you entry after entry. > > Same logic as with explicit SGL, since you will also need to enumerate it to translate to your hardware's format. > > -- > Maxim S. Shatskih > Windows DDK MVP > ma...(a)storagecraft.comhttp://www.storagecraft.com oh now it's clear, thanks maxim. |