scsi: qedf: Wait for upload and link down processing during soft ctx reset

 - Wait for all the connections to get uploaded.
Signed-off-by: Chad Dupuis <cdupuis@marvell.com>
Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qedf/qedf.h

@@ -500,7 +500,7 @@ extern void qedf_set_vlan_id(struct qedf_ctx *qedf, int vlan_id);
 extern void qedf_create_sysfs_ctx_attr(struct qedf_ctx *qedf);
 extern void qedf_remove_sysfs_ctx_attr(struct qedf_ctx *qedf);
 extern void qedf_capture_grc_dump(struct qedf_ctx *qedf);
-extern void qedf_wait_for_upload(struct qedf_ctx *qedf);
+bool qedf_wait_for_upload(struct qedf_ctx *qedf);
 extern void qedf_process_unsol_compl(struct qedf_ctx *qedf, uint16_t que_idx,
 	struct fcoe_cqe *cqe);
 extern void qedf_restart_rport(struct qedf_rport *fcport);
@@ -514,6 +514,8 @@ extern void qedf_get_protocol_tlv_data(void *dev, void *data);
 extern void qedf_fp_io_handler(struct work_struct *work);
 extern void qedf_get_generic_tlv_data(void *dev, struct qed_generic_tlvs *data);
 extern void qedf_wq_grcdump(struct work_struct *work);
+void qedf_stag_change_work(struct work_struct *work);
+void qedf_ctx_soft_reset(struct fc_lport *lport);
 
 #define FCOE_WORD_TO_BYTE  4
 #define QEDF_MAX_TASK_NUM	0xFFFF

drivers/scsi/qedf/qedf_fip.c

@@ -236,9 +236,7 @@ void qedf_fip_recv(struct qedf_ctx *qedf, struct sk_buff *skb)
 		QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
 		    "do_reset=%d.\n", do_reset);
 		if (do_reset) {
-			fcoe_ctlr_link_down(&qedf->ctlr);
-			qedf_wait_for_upload(qedf);
-			fcoe_ctlr_link_up(&qedf->ctlr);
+			qedf_ctx_soft_reset(qedf->lport);
 		}
 		kfree_skb(skb);
 	} else {

drivers/scsi/qedf/qedf_main.c

@@ -156,7 +156,8 @@ static void qedf_handle_link_update(struct work_struct *work)
 	    container_of(work, struct qedf_ctx, link_update.work);
 	int rc;
 
-	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Entered.\n");
+	QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC, "Entered. link_state=%d.\n",
+		  atomic_read(&qedf->link_state));
 
 	if (atomic_read(&qedf->link_state) == QEDF_LINK_UP) {
 		rc = qedf_initiate_fipvlan_req(qedf);
@@ -194,7 +195,9 @@ static void qedf_handle_link_update(struct work_struct *work)
 		QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
 		    "Calling fcoe_ctlr_link_down().\n");
 		fcoe_ctlr_link_down(&qedf->ctlr);
-		qedf_wait_for_upload(qedf);
+		if (qedf_wait_for_upload(qedf) == false)
+			QEDF_ERR(&qedf->dbg_ctx,
+				 "Could not upload all sessions.\n");
 		/* Reset the number of FIP VLAN retries */
 		qedf->fipvlan_retries = qedf_fipvlan_retries;
 	}
@@ -780,22 +783,42 @@ static int qedf_eh_device_reset(struct scsi_cmnd *sc_cmd)
 	return qedf_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
 }
 
-void qedf_wait_for_upload(struct qedf_ctx *qedf)
+bool qedf_wait_for_upload(struct qedf_ctx *qedf)
 {
+	struct qedf_rport *fcport = NULL;
+
 	while (1) {
 		if (atomic_read(&qedf->num_offloads))
 			QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
 			    "Waiting for all uploads to complete.\n");
 		else
-			break;
+			return true;
 		msleep(500);
 	}
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(fcport, &qedf->fcports, peers) {
+		if (fcport && test_bit(QEDF_RPORT_SESSION_READY,
+				       &fcport->flags)) {
+			if (fcport->rdata)
+				QEDF_ERR(&qedf->dbg_ctx,
+					 "Waiting for fcport %p portid=%06x.\n",
+					 fcport, fcport->rdata->ids.port_id);
+			} else {
+				QEDF_ERR(&qedf->dbg_ctx,
+					 "Waiting for fcport %p.\n", fcport);
+			}
+	}
+	rcu_read_unlock();
+	return false;
+
 }
 
 /* Performs soft reset of qedf_ctx by simulating a link down/up */
-static void qedf_ctx_soft_reset(struct fc_lport *lport)
+void qedf_ctx_soft_reset(struct fc_lport *lport)
 {
 	struct qedf_ctx *qedf;
+	struct qed_link_output if_link;
 
 	if (lport->vport) {
 		QEDF_ERR(NULL, "Cannot issue host reset on NPIV port.\n");
@@ -806,11 +829,32 @@ static void qedf_ctx_soft_reset(struct fc_lport *lport)
 
 	/* For host reset, essentially do a soft link up/down */
 	atomic_set(&qedf->link_state, QEDF_LINK_DOWN);
+	QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC,
+		  "Queuing link down work.\n");
 	queue_delayed_work(qedf->link_update_wq, &qedf->link_update,
 	    0);
-	qedf_wait_for_upload(qedf);
+
+	if (qedf_wait_for_upload(qedf) == false) {
+		QEDF_ERR(&qedf->dbg_ctx, "Could not upload all sessions.\n");
+		WARN_ON(atomic_read(&qedf->num_offloads));
+	}
+
+	/* Before setting link up query physical link state */
+	qed_ops->common->get_link(qedf->cdev, &if_link);
+	/* Bail if the physical link is not up */
+	if (!if_link.link_up) {
+		QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC,
+			  "Physical link is not up.\n");
+		return;
+	}
+	/* Flush and wait to make sure link down is processed */
+	flush_delayed_work(&qedf->link_update);
+	msleep(500);
+
 	atomic_set(&qedf->link_state, QEDF_LINK_UP);
 	qedf->vlan_id  = 0;
+	QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_DISC,
+		  "Queue link up work.\n");
 	queue_delayed_work(qedf->link_update_wq, &qedf->link_update,
 	    0);
 }
@@ -3453,7 +3497,9 @@ static void __qedf_remove(struct pci_dev *pdev, int mode)
 		fcoe_ctlr_link_down(&qedf->ctlr);
 	else
 		fc_fabric_logoff(qedf->lport);
-	qedf_wait_for_upload(qedf);
+
+	if (qedf_wait_for_upload(qedf) == false)
+		QEDF_ERR(&qedf->dbg_ctx, "Could not upload all sessions.\n");
 
 #ifdef CONFIG_DEBUG_FS
 	qedf_dbg_host_exit(&(qedf->dbg_ctx));