LXR linux/drivers/net/ethernet/intel/ice/ice

   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 master:1; /* this is a master */
  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_ */
  88