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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 <[email protected]>
Signed-off-by: Uma Krishnan <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
This commit is contained in:
Matthew R. Ochs 2017-04-12 14:14:05 -05:00 • committed by Martin K. Petersen
commit 8fa4f1770d
8 changed files with 77 additions and 45 deletions
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5
Documentation/powerpc/cxlflash.txt
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@ -239,6 +239,11 @@ DK_CXLFLASH_USER_VIRTUAL
resource handle that is provided is already referencing provisioned
storage. This is reflected by the last LBA being a non-zero value.
When a LUN is accessible from more than one port, this ioctl will
return with the DK_CXLFLASH_ALL_PORTS_ACTIVE return flag set. This
provides the user with a hint that I/O can be retried in the event
of an I/O error as the LUN can be reached over multiple paths.
DK_CXLFLASH_VLUN_RESIZE
-----------------------
This ioctl is responsible for resizing a previously created virtual