Reuse of Packets

A target driver can reuse packets in the following ways:

• Resubmit the packet unchanged.

• Use scsi_sync_pkt(9F) to synchronize the data, then process the data in the driver and resubmit.

• Free DMA resources, using scsi_dmafree(9F), and pass the pkt pointer to scsi_init_pkt(9F) for binding to a new bp. The target driver is responsible for reinitializing the packet. The CDB has to have the same length as the previous CDB.

• If partial DMA was allocated during the first call to scsi_init_pkt(9F), subsequent calls to scsi_init_pkt(9F) can be made for the same packet and bp to adjust the DMA resources to the next portion of the transfer.