From efec4b90f1a9b4c80827e4b8c0863334e13b0bf1 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Thu, 30 Oct 2014 14:45:36 +0100 Subject: scsi: add support for multiple hardware queues Allow a SCSI LLD to declare how many hardware queues it supports by setting Scsi_Host.nr_hw_queues before calling scsi_add_host(). Signed-off-by: Bart Van Assche Reviewed-by: Sagi Grimberg Reviewed-by: Martin K. Petersen Signed-off-by: Christoph Hellwig --- include/scsi/scsi_host.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include/scsi') diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 5e36248..bb9e278 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -638,6 +638,14 @@ struct Scsi_Host { short unsigned int sg_prot_tablesize; unsigned int max_sectors; unsigned long dma_boundary; + /* + * In scsi-mq mode, the number of hardware queues supported by the LLD. + * + * Note: it is assumed that each hardware queue has a queue depth of + * can_queue. In other words, the total queue depth per host + * is nr_hw_queues * can_queue. + */ + unsigned nr_hw_queues; /* * Used to assign serial numbers to the cmds. * Protected by the host lock. -- cgit v1.1