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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 <bvanassche@acm.org>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Bart Van Assche 2014-10-30 14:45:36 +01:00 committed by Christoph Hellwig
parent 205fb5f5ba
commit efec4b90f1
2 changed files with 9 additions and 1 deletions
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2
drivers/scsi/scsi_lib.c
View File

@ -2106,7 +2106,7 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
memset(&shost->tag_set, 0, sizeof(shost->tag_set));
shost->tag_set.ops = &scsi_mq_ops;
shost->tag_set.nr_hw_queues = 1;
shost->tag_set.nr_hw_queues = shost->nr_hw_queues ? : 1;
shost->tag_set.queue_depth = shost->can_queue;
shost->tag_set.cmd_size = cmd_size;
shost->tag_set.numa_node = NUMA_NO_NODE;

8
include/scsi/scsi_host.h
View File

@ -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.