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mpt2sas, mpt3sas: fix upper bound for the module parameter max_sgl_entries

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Change Set:

1. Extended the upper boundary restriction for the module parameter
   max_sgl_entries. Earlier, the max_sgl_entries was capped at the
   SCSI_MAX_SG_SEGMENTS kernel definition. With this change, the user
   would be able to set the max_sgl_entries to any value which is
   greater than SCSI_MAX_SG_SEGMENTS and less than the minimum of
   SCSI_MAX_SG_CHAIN_SEGMENTS & hardware limit (Calculated using
   IOCFacts's MaxChainDepth).

2. Added a print for the message log whenever the user sets the
   max_sgl_entries to a value greater than SCSI_MAX_SG_SEGMENTS to
   warn about the kernel definition overriding.

Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@avagotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sreekanth Reddy 2015-01-12 11:39:00 +05:30 committed by Christoph Hellwig
parent d42432ad6c
commit ad666a0f41
2 changed files with 15 additions and 5 deletions
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10
drivers/scsi/mpt2sas/mpt2sas_base.c
View file

@ -2492,9 +2492,13 @@ _base_allocate_memory_pools(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
/* command line tunables for max sgl entries */
if (max_sgl_entries != -1) {
ioc->shost->sg_tablesize = (max_sgl_entries <
MPT2SAS_SG_DEPTH) ? max_sgl_entries :
MPT2SAS_SG_DEPTH;
ioc->shost->sg_tablesize = min_t(unsigned short,
max_sgl_entries, SCSI_MAX_SG_CHAIN_SEGMENTS);
if (ioc->shost->sg_tablesize > MPT2SAS_SG_DEPTH)
printk(MPT2SAS_WARN_FMT
"sg_tablesize(%u) is bigger than kernel defined"
" SCSI_MAX_SG_SEGMENTS(%u)\n", ioc->name,
ioc->shost->sg_tablesize, MPT2SAS_SG_DEPTH);
} else {
ioc->shost->sg_tablesize = MPT2SAS_SG_DEPTH;
}

10
drivers/scsi/mpt3sas/mpt3sas_base.c
View file

@ -2666,8 +2666,14 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc, int sleep_flag)
if (sg_tablesize < MPT3SAS_MIN_PHYS_SEGMENTS)
sg_tablesize = MPT3SAS_MIN_PHYS_SEGMENTS;
else if (sg_tablesize > MPT3SAS_MAX_PHYS_SEGMENTS)
sg_tablesize = MPT3SAS_MAX_PHYS_SEGMENTS;
else if (sg_tablesize > MPT3SAS_MAX_PHYS_SEGMENTS) {
sg_tablesize = min_t(unsigned short, sg_tablesize,
SCSI_MAX_SG_CHAIN_SEGMENTS);
pr_warn(MPT3SAS_FMT
"sg_tablesize(%u) is bigger than kernel"
" defined SCSI_MAX_SG_SEGMENTS(%u)\n", ioc->name,
sg_tablesize, MPT3SAS_MAX_PHYS_SEGMENTS);
}
ioc->shost->sg_tablesize = sg_tablesize;
ioc->hi_priority_depth = facts->HighPriorityCredit;