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/* 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_ */
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