scsi: lpfc: Correct sysfs reporting of loop support after SFP status change

Applications determine loop support in part by querying the 'pls' sysfs
node. Reporting of 'pls' (Private Loop Support) is derived from the
descriptor returned by the COMMON_GET_SLI4_PARAMETERS mailbox command,
which is issued during initialization or after a reset.

The value of this field may change if there is a dynamic SFP change.  The
driver currently will not pick up the change as there was no reset
scenario.

Rework to commonize the sending of the COMMON_GET_SLI4_PARAMETERS
command. Add the calling of the routine after receipt of an async event
indicating an SFP change.

Link: https://lore.kernel.org/r/[email protected]
Co-developed-by: Justin Tee <[email protected]>
Signed-off-by: Justin Tee <[email protected]>
Signed-off-by: James Smart <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: jsmart-gh

drivers/scsi/lpfc/lpfc_crtn.h

@@ -205,6 +205,7 @@ void lpfc_delayed_disc_timeout_handler(struct lpfc_vport *);
 int lpfc_config_port_prep(struct lpfc_hba *);
 void lpfc_update_vport_wwn(struct lpfc_vport *vport);
 int lpfc_config_port_post(struct lpfc_hba *);
+int lpfc_sli4_refresh_params(struct lpfc_hba *phba);
 int lpfc_hba_down_prep(struct lpfc_hba *);
 int lpfc_hba_down_post(struct lpfc_hba *);
 void lpfc_hba_init(struct lpfc_hba *, uint32_t *);

drivers/scsi/lpfc/lpfc_init.c

@@ -662,6 +662,50 @@ lpfc_config_port_post(struct lpfc_hba *phba)
 	return 0;
 }
 
+/**
+ * lpfc_sli4_refresh_params - update driver copy of params.
+ * @phba: Pointer to HBA context object.
+ *
+ * This is called to refresh driver copy of dynamic fields from the
+ * common_get_sli4_parameters descriptor.
+ **/
+int
+lpfc_sli4_refresh_params(struct lpfc_hba *phba)
+{
+	LPFC_MBOXQ_t *mboxq;
+	struct lpfc_mqe *mqe;
+	struct lpfc_sli4_parameters *mbx_sli4_parameters;
+	int length, rc;
+
+	mboxq = (LPFC_MBOXQ_t *)mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
+	if (!mboxq)
+		return -ENOMEM;
+
+	mqe = &mboxq->u.mqe;
+	/* Read the port's SLI4 Config Parameters */
+	length = (sizeof(struct lpfc_mbx_get_sli4_parameters) -
+		  sizeof(struct lpfc_sli4_cfg_mhdr));
+	lpfc_sli4_config(phba, mboxq, LPFC_MBOX_SUBSYSTEM_COMMON,
+			 LPFC_MBOX_OPCODE_GET_SLI4_PARAMETERS,
+			 length, LPFC_SLI4_MBX_EMBED);
+
+	rc = lpfc_sli_issue_mbox(phba, mboxq, MBX_POLL);
+	if (unlikely(rc)) {
+		mempool_free(mboxq, phba->mbox_mem_pool);
+		return rc;
+	}
+	mbx_sli4_parameters = &mqe->un.get_sli4_parameters.sli4_parameters;
+	phba->sli4_hba.pc_sli4_params.mi_ver =
+			bf_get(cfg_mi_ver, mbx_sli4_parameters);
+	phba->sli4_hba.pc_sli4_params.cmf =
+			bf_get(cfg_cmf, mbx_sli4_parameters);
+	phba->sli4_hba.pc_sli4_params.pls =
+			bf_get(cfg_pvl, mbx_sli4_parameters);
+
+	mempool_free(mboxq, phba->mbox_mem_pool);
+	return rc;
+}
+
 /**
  * lpfc_hba_init_link - Initialize the FC link
  * @phba: pointer to lpfc hba data structure.
@@ -6455,6 +6499,12 @@ lpfc_sli4_async_sli_evt(struct lpfc_hba *phba, struct lpfc_acqe_sli *acqe_sli)
 					"3194 Unable to retrieve supported "
 					"speeds, rc = 0x%x\n", rc);
 		}
+		rc = lpfc_sli4_refresh_params(phba);
+		if (rc) {
+			lpfc_printf_log(phba, KERN_ERR, LOG_SLI,
+					"3174 Unable to update pls support, "
+					"rc x%x\n", rc);
+		}
 		vports = lpfc_create_vport_work_array(phba);
 		if (vports != NULL) {
 			for (i = 0; i <= phba->max_vports && vports[i] != NULL;

drivers/scsi/lpfc/lpfc_sli.c

@@ -7891,36 +7891,19 @@ static int
 lpfc_cmf_setup(struct lpfc_hba *phba)
 {
 	LPFC_MBOXQ_t *mboxq;
-	struct lpfc_mqe *mqe;
 	struct lpfc_dmabuf *mp;
 	struct lpfc_pc_sli4_params *sli4_params;
-	struct lpfc_sli4_parameters *mbx_sli4_parameters;
-	int length;
 	int rc, cmf, mi_ver;
 
+	rc = lpfc_sli4_refresh_params(phba);
+	if (unlikely(rc))
+		return rc;
+
 	mboxq = (LPFC_MBOXQ_t *)mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
 	if (!mboxq)
 		return -ENOMEM;
-	mqe = &mboxq->u.mqe;
-
-	/* Read the port's SLI4 Config Parameters */
-	length = (sizeof(struct lpfc_mbx_get_sli4_parameters) -
-		  sizeof(struct lpfc_sli4_cfg_mhdr));
-	lpfc_sli4_config(phba, mboxq, LPFC_MBOX_SUBSYSTEM_COMMON,
-			 LPFC_MBOX_OPCODE_GET_SLI4_PARAMETERS,
-			 length, LPFC_SLI4_MBX_EMBED);
-
-	rc = lpfc_sli_issue_mbox(phba, mboxq, MBX_POLL);
-	if (unlikely(rc)) {
-		mempool_free(mboxq, phba->mbox_mem_pool);
-		return rc;
-	}
 
-	/* Gather info on CMF and MI support */
 	sli4_params = &phba->sli4_hba.pc_sli4_params;
-	mbx_sli4_parameters = &mqe->un.get_sli4_parameters.sli4_parameters;
-	sli4_params->mi_ver = bf_get(cfg_mi_ver, mbx_sli4_parameters);
-	sli4_params->cmf = bf_get(cfg_cmf, mbx_sli4_parameters);
 
 	/* Are we forcing MI off via module parameter? */
 	if (!phba->cfg_enable_mi)