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scsi: introduce a max_segment_size host_template parameters

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This allows the host driver to indicate the maximum supported
segment size in a nice an easy way, so that the driver doesn't
have to worry about DMA-layer imposed limitations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig
2018-12-13 16:17:03 +01:00
committed by Martin K. Petersen
parent 2a3d4eb8e2
commit 50c2e9107f
5 changed files with 15 additions and 9 deletions
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6
include/scsi/scsi_host.h
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@@ -364,6 +364,11 @@ struct scsi_host_template {
*/
unsigned int max_sectors;
/*
* Maximum size in bytes of a single segment.
*/
unsigned int max_segment_size;
/*
* DMA scatter gather segment boundary limit. A segment crossing this
* boundary will be split in two.
@@ -603,6 +608,7 @@ struct Scsi_Host {
short unsigned int sg_tablesize;
short unsigned int sg_prot_tablesize;
unsigned int max_sectors;
unsigned int max_segment_size;
unsigned long dma_boundary;
/*
* In scsi-mq mode, the number of hardware queues supported by the LLD.