1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ice/ice_lag.h b/drivers/net/ethernet/intel/ice/ice_lag.h
new file mode 100644
index 000000000000..c2e3688dd8fd
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_lag.h
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2018-2021, Intel Corporation. */
+
+#ifndef _ICE_LAG_H_
+#define _ICE_LAG_H_
+
+#include <linux/netdevice.h>
+
+/* LAG roles for netdev */
+enum ice_lag_role {
+	ICE_LAG_NONE,
+	ICE_LAG_PRIMARY,
+	ICE_LAG_BACKUP,
+	ICE_LAG_UNSET
+};
+
+struct ice_pf;
+
+/* LAG info struct */
+struct ice_lag {
+	struct ice_pf *pf; /* backlink to PF struct */
+	struct net_device *netdev; /* this PF's netdev */
+	struct net_device *peer_netdev;
+	struct net_device *upper_netdev; /* upper bonding netdev */
+	struct notifier_block notif_block;
+	u8 bonded:1; /* currently bonded */
+	u8 master:1; /* this is a master */
+	u8 handler:1; /* did we register a rx_netdev_handler */
+	/* each thing blocking bonding will increment this value by one.
+	 * If this value is zero, then bonding is allowed.
+	 */
+	u16 dis_lag;
+	u8 role;
+};
+
+int ice_init_lag(struct ice_pf *pf);
+void ice_deinit_lag(struct ice_pf *pf);
+rx_handler_result_t ice_lag_nop_handler(struct sk_buff **pskb);
+
+/**
+ * ice_disable_lag - increment LAG disable count
+ * @lag: LAG struct
+ */
+static inline void ice_disable_lag(struct ice_lag *lag)
+{
+	/* If LAG this PF is not already disabled, disable it */
+	rtnl_lock();
+	if (!netdev_is_rx_handler_busy(lag->netdev)) {
+		if (!netdev_rx_handler_register(lag->netdev,
+						ice_lag_nop_handler,
+						NULL))
+			lag->handler = true;
+	}
+	rtnl_unlock();
+	lag->dis_lag++;
+}
+
+/**
+ * ice_enable_lag - decrement disable count for a PF
+ * @lag: LAG struct
+ *
+ * Decrement the disable counter for a port, and if that count reaches
+ * zero, then remove the no-op Rx handler from that netdev
+ */
+static inline void ice_enable_lag(struct ice_lag *lag)
+{
+	if (lag->dis_lag)
+		lag->dis_lag--;
+	if (!lag->dis_lag && lag->handler) {
+		rtnl_lock();
+		netdev_rx_handler_unregister(lag->netdev);
+		rtnl_unlock();
+		lag->handler = false;
+	}
+}
+
+/**
+ * ice_is_lag_dis - is LAG disabled
+ * @lag: LAG struct
+ *
+ * Return true if bonding is disabled
+ */
+static inline bool ice_is_lag_dis(struct ice_lag *lag)
+{
+	return !!(lag->dis_lag);
+}
+#endif /* _ICE_LAG_H_ */