[PATCH 2/6] lpfc: Correct bandwidth logging during receipt of congestion sync WCQE

[Justin Tee <justintee8345@gmail.com>]

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>
---
 drivers/scsi/lpfc/lpfc_sli.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index d25afc9dde14..a66026432572 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -1848,6 +1848,12 @@ lpfc_cmf_sync_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 				  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)
-- 
2.38.0