scsi: lpfc: Correct speeds on SFP swap

Supported speeds is not updated when SFP is removed or replaced

Supported speed is obtained from lmt field in READ_CONFIG mailbox
response. Driver updates supported speeds only once from PCI probe
path. After that it is never updated. So, supported speeds remains the
same till reboot or driver reload.

When SFP is removed or inserted, driver gets SLI-Port Event ACQE.  If
SFP is removed, lmt wil have value 0. If a different SFP is inserted,
lmt will have value according to its supported speeds.  So, afterr
SLI-Port Event ACQE handling path, send READ_CONFIG mailbox and update
supported speeds. If READ_CONFIG fails, set supported speeds to
unknown and log.
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/lpfc/lpfc_init.c

@@ -4102,6 +4102,30 @@ int lpfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
 	return stat;
 }
 
+void lpfc_host_supported_speeds_set(struct Scsi_Host *shost)
+{
+	struct lpfc_vport *vport = (struct lpfc_vport *)shost->hostdata;
+	struct lpfc_hba   *phba = vport->phba;
+
+	fc_host_supported_speeds(shost) = 0;
+	if (phba->lmt & LMT_64Gb)
+		fc_host_supported_speeds(shost) |= FC_PORTSPEED_64GBIT;
+	if (phba->lmt & LMT_32Gb)
+		fc_host_supported_speeds(shost) |= FC_PORTSPEED_32GBIT;
+	if (phba->lmt & LMT_16Gb)
+		fc_host_supported_speeds(shost) |= FC_PORTSPEED_16GBIT;
+	if (phba->lmt & LMT_10Gb)
+		fc_host_supported_speeds(shost) |= FC_PORTSPEED_10GBIT;
+	if (phba->lmt & LMT_8Gb)
+		fc_host_supported_speeds(shost) |= FC_PORTSPEED_8GBIT;
+	if (phba->lmt & LMT_4Gb)
+		fc_host_supported_speeds(shost) |= FC_PORTSPEED_4GBIT;
+	if (phba->lmt & LMT_2Gb)
+		fc_host_supported_speeds(shost) |= FC_PORTSPEED_2GBIT;
+	if (phba->lmt & LMT_1Gb)
+		fc_host_supported_speeds(shost) |= FC_PORTSPEED_1GBIT;
+}
+
 /**
  * lpfc_host_attrib_init - Initialize SCSI host attributes on a FC port
  * @shost: pointer to SCSI host data structure.
@@ -4129,23 +4153,7 @@ void lpfc_host_attrib_init(struct Scsi_Host *shost)
 	lpfc_vport_symbolic_node_name(vport, fc_host_symbolic_name(shost),
 				 sizeof fc_host_symbolic_name(shost));
 
-	fc_host_supported_speeds(shost) = 0;
-	if (phba->lmt & LMT_64Gb)
-		fc_host_supported_speeds(shost) |= FC_PORTSPEED_64GBIT;
-	if (phba->lmt & LMT_32Gb)
-		fc_host_supported_speeds(shost) |= FC_PORTSPEED_32GBIT;
-	if (phba->lmt & LMT_16Gb)
-		fc_host_supported_speeds(shost) |= FC_PORTSPEED_16GBIT;
-	if (phba->lmt & LMT_10Gb)
-		fc_host_supported_speeds(shost) |= FC_PORTSPEED_10GBIT;
-	if (phba->lmt & LMT_8Gb)
-		fc_host_supported_speeds(shost) |= FC_PORTSPEED_8GBIT;
-	if (phba->lmt & LMT_4Gb)
-		fc_host_supported_speeds(shost) |= FC_PORTSPEED_4GBIT;
-	if (phba->lmt & LMT_2Gb)
-		fc_host_supported_speeds(shost) |= FC_PORTSPEED_2GBIT;
-	if (phba->lmt & LMT_1Gb)
-		fc_host_supported_speeds(shost) |= FC_PORTSPEED_1GBIT;
+	lpfc_host_supported_speeds_set(shost);
 
 	fc_host_maxframe_size(shost) =
 		(((uint32_t) vport->fc_sparam.cmn.bbRcvSizeMsb & 0x0F) << 8) |
@@ -4758,6 +4766,8 @@ lpfc_sli4_async_sli_evt(struct lpfc_hba *phba, struct lpfc_acqe_sli *acqe_sli)
 	struct temp_event temp_event_data;
 	struct lpfc_acqe_misconfigured_event *misconfigured;
 	struct Scsi_Host  *shost;
+	struct lpfc_vport **vports;
+	int rc, i;
 
 	evt_type = bf_get(lpfc_trailer_type, acqe_sli);
 
@@ -4883,6 +4893,25 @@ lpfc_sli4_async_sli_evt(struct lpfc_hba *phba, struct lpfc_acqe_sli *acqe_sli)
 			sprintf(message, "Unknown event status x%02x", status);
 			break;
 		}
+
+		/* Issue READ_CONFIG mbox command to refresh supported speeds */
+		rc = lpfc_sli4_read_config(phba);
+		if (rc == -EIO) {
+			phba->lmt = 0;
+			lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
+					"3194 Unable to retrieve supported "
+					"speeds\n");
+		}
+		vports = lpfc_create_vport_work_array(phba);
+		if (vports != NULL) {
+			for (i = 0; i <= phba->max_vports && vports[i] != NULL;
+					i++) {
+				shost = lpfc_shost_from_vport(vports[i]);
+				lpfc_host_supported_speeds_set(shost);
+			}
+		}
+		lpfc_destroy_vport_work_array(phba, vports);
+
 		phba->sli4_hba.lnk_info.optic_state = status;
 		lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
 				"3176 Port Name %c %s\n", port_name, message);