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| author | Bart Van Assche <bvanassche@acm.org> | 2014-10-30 14:45:36 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2014-11-12 11:16:09 +0100 |
| commit | efec4b90f1a9b4c80827e4b8c0863334e13b0bf1 (patch) | |
| tree | fef1e42abeb10ae721e59c6da163a1bfe8b2ad60 /include/scsi | |
| parent | 205fb5f5ba1d8edcf18009998ed05b80b7d186af (diff) | |
| download | lwn-efec4b90f1a9b4c80827e4b8c0863334e13b0bf1.tar.gz lwn-efec4b90f1a9b4c80827e4b8c0863334e13b0bf1.zip | |
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>
Diffstat (limited to 'include/scsi')
| -rw-r--r-- | include/scsi/scsi_host.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 5e362489ee88..bb9e27815be5 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. |