[SCSI] mpt2sas: Calulate the Reply post queue depth calculation as per the MPI spec
[jejb: checkpatch fixes]
Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index 8bb1fe9..ccd6d5a 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -2503,23 +2503,25 @@
/* 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,