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aacraid: SCSI blk tag support

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The method to allocate and free FIB's in the present code utilizes
spinlocks. Multiple IO's have to wait on the spinlock to acquire or free
fibs creating a performance bottleneck.

An alternative solution would be to use block layer tags to keep track
of the fibs allocated and freed. To this end aac_fib_alloc_tag was
created to utilize the blk layer tags to plug into the Fib pool.These
functions are used exclusively in the IO path. 8 fibs are reserved for
the use of AIF management software and utilize the previous spinlock
based implementations.

Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@pmcs.com>
Reviewed-by: Shane Seymour <shane.seymour@hpe.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Raghava Aditya Renukunta
2016-02-03 15:05:59 -08:00
committed by Martin K. Petersen
parent bd8d859a21
commit 6bf3b630d0
5 changed files with 44 additions and 20 deletions
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32
drivers/scsi/aacraid/commsup.c
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@@ -137,6 +137,7 @@ int aac_fib_setup(struct aac_dev * dev)
i++, fibptr++)
{
fibptr->flags = 0;
fibptr->size = sizeof(struct fib);
fibptr->dev = dev;
fibptr->hw_fib_va = hw_fib;
fibptr->data = (void *) fibptr->hw_fib_va->data;
@@ -156,12 +157,37 @@ int aac_fib_setup(struct aac_dev * dev)
*/
dev->fibs[dev->scsi_host_ptr->can_queue + AAC_NUM_MGT_FIB - 1].next = NULL;
/*
* Enable this to debug out of queue space
*/
dev->free_fib = &dev->fibs[0];
* Set 8 fibs aside for management tools
*/
dev->free_fib = &dev->fibs[dev->scsi_host_ptr->can_queue];
return 0;
}
/**
* aac_fib_alloc_tag-allocate a fib using tags
* @dev: Adapter to allocate the fib for
*
* Allocate a fib from the adapter fib pool using tags
* from the blk layer.
*/
struct fib *aac_fib_alloc_tag(struct aac_dev *dev, struct scsi_cmnd *scmd)
{
struct fib *fibptr;
fibptr = &dev->fibs[scmd->request->tag];
/*
* Null out fields that depend on being zero at the start of
* each I/O
*/
fibptr->hw_fib_va->header.XferState = 0;
fibptr->type = FSAFS_NTC_FIB_CONTEXT;
fibptr->callback_data = NULL;
fibptr->callback = NULL;
return fibptr;
}
/**
* aac_fib_alloc - allocate a fib
* @dev: Adapter to allocate the fib for