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scsi: cxlflash: Remove port configuration assumptions

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At present, the cxlflash driver only supports hardware with two FC ports. The
code was initially designed with this assumption and is dependent on having
two FC ports - adding more ports will break logic within the driver.

To mitigate this issue, remove the existing port assumptions and transition
the code to support more than two ports. As a side effect, clarify the
interpretation of the DK_CXLFLASH_ALL_PORTS_ACTIVE flag.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Matthew R. Ochs
2017-04-12 14:14:05 -05:00
committed by Martin K. Petersen
parent 78ae028e82
commit 8fa4f1770d
8 changed files with 77 additions and 45 deletions
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4
drivers/scsi/cxlflash/common.h
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@@ -29,6 +29,10 @@ extern const struct file_operations cxlflash_cxl_fops;
#define NUM_FC_PORTS CXLFLASH_NUM_FC_PORTS /* ports per AFU */
#define MAX_FC_PORTS CXLFLASH_MAX_FC_PORTS /* ports per AFU */
#define CHAN2PORTMASK(_x) (1 << (_x)) /* channel to port mask */
#define PORTMASK2CHAN(_x) (ilog2((_x))) /* port mask to channel */
#define PORTNUM2CHAN(_x) ((_x) - 1) /* port number to channel */
#define CXLFLASH_BLOCK_SIZE 4096 /* 4K blocks */
#define CXLFLASH_MAX_XFER_SIZE 16777216 /* 16MB transfer */
#define CXLFLASH_MAX_SECTORS (CXLFLASH_MAX_XFER_SIZE/512) /* SCSI wants