scsi: lpfc: Log when congestion management limits are in effect

When bandwidth reduces from or recovers back to 100% due to congestion
management, log the event.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20221017164323.14536-3-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/lpfc/lpfc_sli.c

@@ -1848,6 +1848,18 @@ 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);
+
+		if (phba->cmf_max_bytes_per_interval < bw &&
+		    bwpcent > 95)
+			lpfc_printf_log(phba, KERN_INFO, LOG_CGN_MGMT,
+					"6208 Congestion bandwidth "
+					"limits removed\n");
+		else if ((phba->cmf_max_bytes_per_interval > bw) &&
+			 ((bwpcent + pcent) <= 100) && ((bwpcent + pcent) > 95))
+			lpfc_printf_log(phba, KERN_INFO, LOG_CGN_MGMT,
+					"6209 Congestion bandwidth "
+					"limits in effect\n");
+
 		if (asig) {
 			lpfc_printf_log(phba, KERN_INFO, LOG_CGN_MGMT,
 					"6237 BW Threshold %lld%% (%lld): "