be2net: don't rearm mcc cq when device is not open

When an MCC cmd is issued (via a netdev/ethtool op)
while the device is not open, the MCC CQ gets processed but the EQ
is not processed (as isr is not registered.) This can cause the EQ
to become full. So, while the device is not open, CQ must not be re-armed
to prevent EQ entries.
Signed-off-by: Sathya Perla <sathyap@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/benet/be.h

@@ -151,6 +151,7 @@ struct be_eq_obj {
 struct be_mcc_obj {
 	struct be_queue_info q;
 	struct be_queue_info cq;
+	bool rearm_cq;
 };
 
 struct be_drvr_stats {

drivers/net/benet/be_cmds.c

@@ -104,10 +104,26 @@ static struct be_mcc_compl *be_mcc_compl_get(struct be_adapter *adapter)
 	return NULL;
 }
 
+void be_async_mcc_enable(struct be_adapter *adapter)
+{
+	spin_lock_bh(&adapter->mcc_cq_lock);
+
+	be_cq_notify(adapter, adapter->mcc_obj.cq.id, true, 0);
+	adapter->mcc_obj.rearm_cq = true;
+
+	spin_unlock_bh(&adapter->mcc_cq_lock);
+}
+
+void be_async_mcc_disable(struct be_adapter *adapter)
+{
+	adapter->mcc_obj.rearm_cq = false;
+}
+
 int be_process_mcc(struct be_adapter *adapter)
 {
 	struct be_mcc_compl *compl;
 	int num = 0, status = 0;
+	struct be_mcc_obj *mcc_obj = &adapter->mcc_obj;
 
 	spin_lock_bh(&adapter->mcc_cq_lock);
 	while ((compl = be_mcc_compl_get(adapter))) {
@@ -120,14 +136,14 @@ int be_process_mcc(struct be_adapter *adapter)
 				(struct be_async_event_link_state *) compl);
 		} else if (compl->flags & CQE_FLAGS_COMPLETED_MASK) {
 				status = be_mcc_compl_process(adapter, compl);
-				atomic_dec(&adapter->mcc_obj.q.used);
+				atomic_dec(&mcc_obj->q.used);
 		}
 		be_mcc_compl_use(compl);
 		num++;
 	}
 
 	if (num)
-		be_cq_notify(adapter, adapter->mcc_obj.cq.id, true, num);
+		be_cq_notify(adapter, mcc_obj->cq.id, mcc_obj->rearm_cq, num);
 
 	spin_unlock_bh(&adapter->mcc_cq_lock);
 	return status;

drivers/net/benet/be_cmds.h

@@ -937,6 +937,8 @@ extern int be_cmd_enable_magic_wol(struct be_adapter *adapter, u8 *mac,
 				struct be_dma_mem *nonemb_cmd);
 extern int be_cmd_fw_init(struct be_adapter *adapter);
 extern int be_cmd_fw_clean(struct be_adapter *adapter);
+extern void be_async_mcc_enable(struct be_adapter *adapter);
+extern void be_async_mcc_disable(struct be_adapter *adapter);
 extern int be_cmd_loopback_test(struct be_adapter *adapter, u32 port_num,
 				u32 loopback_type, u32 pkt_size,
 				u32 num_pkts, u64 pattern);

drivers/net/benet/be_main.c

@@ -1655,6 +1655,9 @@ static int be_open(struct net_device *netdev)
 	/* Rx compl queue may be in unarmed state; rearm it */
 	be_cq_notify(adapter, adapter->rx_obj.cq.id, true, 0);
 
+	/* Now that interrupts are on we can process async mcc */
+	be_async_mcc_enable(adapter);
+
 	status = be_cmd_link_status_query(adapter, &link_up, &mac_speed,
 			&link_speed);
 	if (status)
@@ -1780,6 +1783,8 @@ static int be_close(struct net_device *netdev)
 
 	cancel_delayed_work_sync(&adapter->work);
 
+	be_async_mcc_disable(adapter);
+
 	netif_stop_queue(netdev);
 	netif_carrier_off(netdev);
 	adapter->link_up = false;