scsi: lpfc: Save FPIN frequency statistics upon receipt of peer cgn notifications

FPIN frequency is provided by the fabric in peer congestion notifications.

Currently, the frequency is only logged in a message, but it should also be
saved into the phba's cgn_fpin statistics member for proper application
functionality.

Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20240131185112.149731-10-justintee8345@gmail.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: Justin Tee

drivers/scsi/lpfc/lpfc_els.c

@@ -10131,6 +10131,9 @@ lpfc_els_rcv_fpin_peer_cgn(struct lpfc_hba *phba, struct fc_tlv_desc *tlv)
 	pc_evt_str = lpfc_get_fpin_congn_event_nm(pc_evt);
 	cnt = be32_to_cpu(pc->pname_count);
 
+	/* Capture FPIN frequency */
+	phba->cgn_fpin_frequency = be32_to_cpu(pc->event_period);
+
 	lpfc_printf_log(phba, KERN_INFO, LOG_CGN_MGMT | LOG_ELS,
 			"4684 FPIN Peer Congestion %s (x%x) "
 			"Duration %d mSecs "