If unsure, say Y.
+config BLK_DEV_BSG
+ bool "Block layer SG support v4 (EXPERIMENTAL)"
+ depends on EXPERIMENTAL
+ ---help---
+ Saying Y here will enable generic SG (SCSI generic) v4 support
+ for any block device.
+
+ Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
+ can handle complicated SCSI commands: tagged variable length cdbs
+ with bidirectional data transfers and generic request/response
+ protocols (e.g. Task Management Functions and SMP in Serial
+ Attached SCSI).
+
endif # BLOCK
source block/Kconfig.iosched