cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ice_lag.h (2058B)

      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_ */