From: Justin Tee <justin.tee@broadcom.com>
Date: Tue, 15 Nov 2022 17:19:17 -0800
Subject: scsi: lpfc: Correct bandwidth logging during receipt of congestion
 sync WCQE
Patch-mainline: v6.2-rc1
Git-commit: ae696255d655bec673e5a5707f37ff6a098e89c2
References: jsc#PED-1445

The lpfc_cmf_timer adjusts phba->cmf_link_byte_count periodically and can
artifically inflate bandwidth percent.

During bandwidth calculation, correct for this by setting a cap of logging
a maximum of 100%.

Bandwidth calculation is only used for display under LOG_CGN_MGMT so there
is no expectation of impacts on performance.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20221116011921.105995-3-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/scsi/lpfc/lpfc_sli.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -1846,6 +1846,12 @@ lpfc_cmf_sync_cmpl(struct lpfc_hba *phba
 				  phba->cmf_link_byte_count);
 		bwpcent = div64_u64(bw * 100 + slop,
 				    phba->cmf_link_byte_count);
+		/* Because of bytes adjustment due to shorter timer in
+		 * lpfc_cmf_timer() the cmf_link_byte_count can be shorter and
+		 * may seem like BW is above 100%.
+		 */
+		if (bwpcent > 100)
+			bwpcent = 100;
 
 		if (phba->cmf_max_bytes_per_interval < bw &&
 		    bwpcent > 95)