scsi: qedf: Modify flush routine to handle all I/Os and TMF

The purpose of flush routine is to cleanup I/Os to the firmware and
complete them to scsi middle layer. This routine is invoked before
connection is uploaded because of rport going away.

 - Don't process any I/Os, aborts, TMFs coming when flush in progress.

 - Add flags to handle cleanup and release of I/Os because flush can
   prematurely complete I/Os.

 - Original command can get completed to driver when cleanup for same is
   posted to firmware, handle this condition.

 - Modify flush to handle I/Os in all the states like abort, TMF, RRQ and
   timeouts.

Signed-off-by: Shyam Sundar <ssundar@marvell.com>
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_els.c

@@ -135,6 +135,8 @@ static int qedf_initiate_els(struct qedf_rport *fcport, unsigned int op,
 	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Ringing doorbell for ELS "
 		   "req\n");
 	qedf_ring_doorbell(fcport);
+	set_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
+
 	spin_unlock_irqrestore(&fcport->rport_lock, flags);
 els_err:
 	return rc;
@@ -151,6 +153,8 @@ void qedf_process_els_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
 	QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_ELS, "Entered with xid = 0x%x"
 		   " cmd_type = %d.\n", els_req->xid, els_req->cmd_type);
 
+	clear_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
+
 	/* Kill the ELS timer */
 	cancel_delayed_work(&els_req->timeout_work);