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rtl8192eu-linux-driver/core/mesh/rtw_mesh_pathtbl.h
Larry Finger d7c3737cd5 Remove wrappers for atomic operations 
These wrappers were useful when this driver had the hooks for Windows,
but are no longer needed.

Link: https://lore.kernel.org/r/20210802192721.23110-4-Larry.Finger@lwfinger.net
2021-10-11 10:44:02 +02:00

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/******************************************************************************
*
* Copyright(c) 2007 - 2017 Realtek Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*****************************************************************************/
#ifndef __RTW_MESH_PATHTBL_H_
#define __RTW_MESH_PATHTBL_H_
#ifndef DBG_RTW_MPATH
#define DBG_RTW_MPATH 1
#endif
#if DBG_RTW_MPATH
#define RTW_MPATH_DBG(fmt, arg...) RTW_PRINT(fmt, ##arg)
#else
#define RTW_MPATH_DBG(fmt, arg...) do {} while (0)
#endif
/**
* enum rtw_mesh_path_flags - mesh path flags
*
* @RTW_MESH_PATH_ACTIVE: the mesh path can be used for forwarding
* @RTW_MESH_PATH_RESOLVING: the discovery process is running for this mesh path
* @RTW_MESH_PATH_SN_VALID: the mesh path contains a valid destination sequence
* number
* @RTW_MESH_PATH_FIXED: the mesh path has been manually set and should not be
* modified
* @RTW_MESH_PATH_RESOLVED: the mesh path can has been resolved
* @RTW_MESH_PATH_REQ_QUEUED: there is an unsent path request for this destination
* already queued up, waiting for the discovery process to start.
* @RTW_MESH_PATH_DELETED: the mesh path has been deleted and should no longer
* be used
* @RTW_MESH_PATH_ROOT_ADD_CHK: root additional check in root mode.
* With this flag, It will try the last used rann_snd_addr
* @RTW_MESH_PATH_PEER_AKA: only used toward a peer, only used in active keep
* alive mechanism. PREQ's da = path dst
*
* RTW_MESH_PATH_RESOLVED is used by the mesh path timer to
* decide when to stop or cancel the mesh path discovery.
*/
enum rtw_mesh_path_flags {
RTW_MESH_PATH_ACTIVE = BIT(0),
RTW_MESH_PATH_RESOLVING = BIT(1),
RTW_MESH_PATH_SN_VALID = BIT(2),
RTW_MESH_PATH_FIXED = BIT(3),
RTW_MESH_PATH_RESOLVED = BIT(4),
RTW_MESH_PATH_REQ_QUEUED = BIT(5),
RTW_MESH_PATH_DELETED = BIT(6),
RTW_MESH_PATH_ROOT_ADD_CHK = BIT(7),
RTW_MESH_PATH_PEER_AKA = BIT(8),
};
/**
* struct rtw_mesh_path - mesh path structure
*
* @dst: mesh path destination mac address
* @mpp: mesh proxy mac address
* @rhash: rhashtable list pointer
* @gate_list: list pointer for known gates list
* @sdata: mesh subif
* @next_hop: mesh neighbor to which frames for this destination will be
* forwarded
* @timer: mesh path discovery timer
* @frame_queue: pending queue for frames sent to this destination while the
* path is unresolved
* @rcu: rcu head for freeing mesh path
* @sn: target sequence number
* @metric: current metric to this destination
* @hop_count: hops to destination
* @exp_time: in jiffies, when the path will expire or when it expired
* @discovery_timeout: timeout (lapse in jiffies) used for the last discovery
* retry
* @discovery_retries: number of discovery retries
* @flags: mesh path flags, as specified on &enum rtw_mesh_path_flags
* @state_lock: mesh path state lock used to protect changes to the
* mpath itself. No need to take this lock when adding or removing
* an mpath to a hash bucket on a path table.
* @rann_snd_addr: the RANN sender address
* @rann_metric: the aggregated path metric towards the root node
* @last_preq_to_root: Timestamp of last PREQ sent to root
* @is_root: the destination station of this path is a root node
* @is_gate: the destination station of this path is a mesh gate
*
*
* The dst address is unique in the mesh path table. Since the mesh_path is
* protected by RCU, deleting the next_hop STA must remove / substitute the
* mesh_path structure and wait until that is no longer reachable before
* destroying the STA completely.
*/
struct rtw_mesh_path {
u8 dst[ETH_ALEN];
u8 mpp[ETH_ALEN]; /* used for MPP or MAP */
rtw_rhash_head rhash;
rtw_hlist_node gate_list;
_adapter *adapter;
struct sta_info __rcu *next_hop;
_timer timer;
_queue frame_queue;
u32 frame_queue_len;
rtw_rcu_head rcu;
u32 sn;
u32 metric;
u8 hop_count;
systime exp_time;
systime discovery_timeout;
systime gate_timeout;
u32 gate_ann_int; /* gate announce interval */
u8 discovery_retries;
enum rtw_mesh_path_flags flags;
_lock state_lock;
u8 rann_snd_addr[ETH_ALEN];
#ifdef CONFIG_RTW_MESH_ADD_ROOT_CHK
u8 add_chk_rann_snd_addr[ETH_ALEN];
#endif
u32 rann_metric;
unsigned long last_preq_to_root;
bool is_root;
bool is_gate;
bool gate_asked;
};
/**
* struct rtw_mesh_table
*
* @known_gates: list of known mesh gates and their mpaths by the station. The
* gate's mpath may or may not be resolved and active.
* @gates_lock: protects updates to known_gates
* @rhead: the rhashtable containing struct mesh_paths, keyed by dest addr
* @entries: number of entries in the table
*/
struct rtw_mesh_table {
rtw_hlist_head known_gates;
_lock gates_lock;
rtw_rhashtable rhead;
atomic_t entries;
};
#define RTW_MESH_PATH_EXPIRE (600 * HZ)
/* Maximum number of paths per interface */
#define RTW_MESH_MAX_MPATHS 1024
/* Number of frames buffered per destination for unresolved destinations */
#define RTW_MESH_FRAME_QUEUE_LEN 10
int rtw_mesh_nexthop_lookup(_adapter *adapter,
const u8 *mda, const u8 *msa, u8 *ra);
int rtw_mesh_nexthop_resolve(_adapter *adapter,
struct xmit_frame *xframe);
struct rtw_mesh_path *rtw_mesh_path_lookup(_adapter *adapter,
const u8 *dst);
struct rtw_mesh_path *rtw_mpp_path_lookup(_adapter *adapter,
const u8 *dst);
int rtw_mpp_path_add(_adapter *adapter,
const u8 *dst, const u8 *mpp);
void dump_mpp(void *sel, _adapter *adapter);
struct rtw_mesh_path *
rtw_mesh_path_lookup_by_idx(_adapter *adapter, int idx);
struct rtw_mesh_path *
rtw_mpp_path_lookup_by_idx(_adapter *adapter, int idx);
void rtw_mesh_path_fix_nexthop(struct rtw_mesh_path *mpath, struct sta_info *next_hop);
void rtw_mesh_path_expire(_adapter *adapter);
struct rtw_mesh_path *
rtw_mesh_path_add(_adapter *adapter, const u8 *dst);
int rtw_mesh_path_add_gate(struct rtw_mesh_path *mpath);
void rtw_mesh_gate_del(struct rtw_mesh_table *tbl, struct rtw_mesh_path *mpath);
bool rtw_mesh_gate_search(struct rtw_mesh_table *tbl, const u8 *addr);
int rtw_mesh_path_send_to_gates(struct rtw_mesh_path *mpath);
int rtw_mesh_gate_num(_adapter *adapter);
bool rtw_mesh_is_primary_gate(_adapter *adapter);
void dump_known_gates(void *sel, _adapter *adapter);
void rtw_mesh_plink_broken(struct sta_info *sta);
void rtw_mesh_path_assign_nexthop(struct rtw_mesh_path *mpath, struct sta_info *sta);
void rtw_mesh_path_flush_pending(struct rtw_mesh_path *mpath);
void rtw_mesh_path_tx_pending(struct rtw_mesh_path *mpath);
int rtw_mesh_pathtbl_init(_adapter *adapter);
void rtw_mesh_pathtbl_unregister(_adapter *adapter);
int rtw_mesh_path_del(_adapter *adapter, const u8 *addr);
void rtw_mesh_path_flush_by_nexthop(struct sta_info *sta);
void rtw_mesh_path_discard_frame(_adapter *adapter,
struct xmit_frame *xframe);
static inline void rtw_mesh_path_activate(struct rtw_mesh_path *mpath)
{
mpath->flags |= RTW_MESH_PATH_ACTIVE | RTW_MESH_PATH_RESOLVED;
}
void rtw_mesh_path_flush_by_iface(_adapter *adapter);
#endif /* __RTW_MESH_PATHTBL_H_ */
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