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[SCSI] mpt2sas: Calulate the Reply post queue depth calculation as per the MPI spec

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[jejb: checkpatch fixes]
Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Sreekanth Reddy 2013-02-01 22:02:04 +05:30 committed by James Bottomley
parent 48ba2efc38
commit 148124d931
1 changed files with 14 additions and 12 deletions
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26
drivers/scsi/mpt2sas/mpt2sas_base.c
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@ -2503,23 +2503,25 @@ _base_allocate_memory_pools(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
/* reply free queue sizing - taking into account for 64 FW events */
ioc->reply_free_queue_depth = ioc->hba_queue_depth + 64;
/* calculate reply descriptor post queue depth */
ioc->reply_post_queue_depth = ioc->hba_queue_depth +
ioc->reply_free_queue_depth + 1;
/* align the reply post queue on the next 16 count boundary */
if (!ioc->reply_free_queue_depth % 16)
ioc->reply_post_queue_depth = ioc->reply_free_queue_depth + 16;
else
ioc->reply_post_queue_depth = ioc->reply_free_queue_depth +
32 - (ioc->reply_free_queue_depth % 16);
if (ioc->reply_post_queue_depth % 16)
ioc->reply_post_queue_depth += 16 -
(ioc->reply_post_queue_depth % 16);
if (ioc->reply_post_queue_depth >
facts->MaxReplyDescriptorPostQueueDepth) {
ioc->reply_post_queue_depth = min_t(u16,
(facts->MaxReplyDescriptorPostQueueDepth -
(facts->MaxReplyDescriptorPostQueueDepth % 16)),
(ioc->hba_queue_depth - (ioc->hba_queue_depth % 16)));
ioc->reply_free_queue_depth = ioc->reply_post_queue_depth - 16;
ioc->hba_queue_depth = ioc->reply_free_queue_depth - 64;
ioc->reply_post_queue_depth =
facts->MaxReplyDescriptorPostQueueDepth -
(facts->MaxReplyDescriptorPostQueueDepth % 16);
ioc->hba_queue_depth =
((ioc->reply_post_queue_depth - 64) / 2) - 1;
ioc->reply_free_queue_depth = ioc->hba_queue_depth + 64;
}
dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "scatter gather: "
"sge_in_main_msg(%d), sge_per_chain(%d), sge_per_io(%d), "
"chains_per_io(%d)\n", ioc->name, ioc->max_sges_in_main_message,