1/* SPDX-License-Identifier: GPL-2.0 */
 2/* Copyright (C) 2018-2021, Intel Corporation. */
 3
 4#ifndef _ICE_LAG_H_
 5#define _ICE_LAG_H_
 6
 7#include <linux/netdevice.h>
 8
 9/* LAG roles for netdev */
10enum ice_lag_role {
11	ICE_LAG_NONE,
12	ICE_LAG_PRIMARY,
13	ICE_LAG_BACKUP,
14	ICE_LAG_UNSET
15};
16
17struct ice_pf;
18
19/* LAG info struct */
20struct ice_lag {
21	struct ice_pf *pf; /* backlink to PF struct */
22	struct net_device *netdev; /* this PF's netdev */
23	struct net_device *peer_netdev;
24	struct net_device *upper_netdev; /* upper bonding netdev */
25	struct notifier_block notif_block;
26	u8 bonded:1; /* currently bonded */
27	u8 primary:1; /* this is primary */
28	u8 handler:1; /* did we register a rx_netdev_handler */
29	/* each thing blocking bonding will increment this value by one.
30	 * If this value is zero, then bonding is allowed.
31	 */
32	u16 dis_lag;
33	u8 role;
34};
35
36int ice_init_lag(struct ice_pf *pf);
37void ice_deinit_lag(struct ice_pf *pf);
38rx_handler_result_t ice_lag_nop_handler(struct sk_buff **pskb);
39
40/**
41 * ice_disable_lag - increment LAG disable count
42 * @lag: LAG struct
43 */
44static inline void ice_disable_lag(struct ice_lag *lag)
45{
46	/* If LAG this PF is not already disabled, disable it */
47	rtnl_lock();
48	if (!netdev_is_rx_handler_busy(lag->netdev)) {
49		if (!netdev_rx_handler_register(lag->netdev,
50						ice_lag_nop_handler,
51						NULL))
52			lag->handler = true;
53	}
54	rtnl_unlock();
55	lag->dis_lag++;
56}
57
58/**
59 * ice_enable_lag - decrement disable count for a PF
60 * @lag: LAG struct
61 *
62 * Decrement the disable counter for a port, and if that count reaches
63 * zero, then remove the no-op Rx handler from that netdev
64 */
65static inline void ice_enable_lag(struct ice_lag *lag)
66{
67	if (lag->dis_lag)
68		lag->dis_lag--;
69	if (!lag->dis_lag && lag->handler) {
70		rtnl_lock();
71		netdev_rx_handler_unregister(lag->netdev);
72		rtnl_unlock();
73		lag->handler = false;
74	}
75}
76
77/**
78 * ice_is_lag_dis - is LAG disabled
79 * @lag: LAG struct
80 *
81 * Return true if bonding is disabled
82 */
83static inline bool ice_is_lag_dis(struct ice_lag *lag)
84{
85	return !!(lag->dis_lag);
86}
87#endif /* _ICE_LAG_H_ */