1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright 2011-2012, Pavel Zubarev <pavel.zubarev@gmail.com>
4  * Copyright 2011-2012, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
5  * Copyright 2011-2012, cozybit Inc.
10 #include "driver-ops.h"
13  * which we do no TSF adjustment.
19  * introduced by TSF adjustment latency.
36  * mesh_peer_tbtt_adjusting - check if an mp is currently adjusting its TBTT
42 	return (ie->mesh_config->meshconf_cap &  in mesh_peer_tbtt_adjusting()
48 	struct ieee80211_local *local = sdata->local;  in mesh_sync_adjust_tsf()
49 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;  in mesh_sync_adjust_tsf()
50 	/* sdata->vif.bss_conf.beacon_int in 1024us units, 0.04% */  in mesh_sync_adjust_tsf()
51 	u64 beacon_int_fraction = sdata->vif.bss_conf.beacon_int * 1024 / 2500;  in mesh_sync_adjust_tsf()
55 	spin_lock_bh(&ifmsh->sync_offset_lock);  in mesh_sync_adjust_tsf()
56 	if (ifmsh->sync_offset_clockdrift_max < beacon_int_fraction) {  in mesh_sync_adjust_tsf()
58 			  (long long) ifmsh->sync_offset_clockdrift_max);  in mesh_sync_adjust_tsf()
59 		tsfdelta = -ifmsh->sync_offset_clockdrift_max;  in mesh_sync_adjust_tsf()
60 		ifmsh->sync_offset_clockdrift_max = 0;  in mesh_sync_adjust_tsf()
63 			  (long long) ifmsh->sync_offset_clockdrift_max,  in mesh_sync_adjust_tsf()
65 		tsfdelta = -beacon_int_fraction;  in mesh_sync_adjust_tsf()
66 		ifmsh->sync_offset_clockdrift_max -= beacon_int_fraction;  in mesh_sync_adjust_tsf()
68 	spin_unlock_bh(&ifmsh->sync_offset_lock);  in mesh_sync_adjust_tsf()
70 	if (local->ops->offset_tsf) {  in mesh_sync_adjust_tsf()
74 		if (tsf != -1ULL)  in mesh_sync_adjust_tsf()
85 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;  in mesh_sync_offset_rx_bcn_presp()
86 	struct ieee80211_local *local = sdata->local;  in mesh_sync_offset_rx_bcn_presp()
90 	WARN_ON(ifmsh->mesh_sp_id != IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET);  in mesh_sync_offset_rx_bcn_presp()
99 	 * drv_get_tsf() must be called before entering the rcu-read  in mesh_sync_offset_rx_bcn_presp()
105 						       elems->total_len +  in mesh_sync_offset_rx_bcn_presp()
112 	sta = sta_info_get(sdata, mgmt->sa);  in mesh_sync_offset_rx_bcn_presp()
119 	 * dot11MeshNbrOffsetMaxNeighbor non-peer non-MBSS neighbors  in mesh_sync_offset_rx_bcn_presp()
122 	if (elems->mesh_config && mesh_peer_tbtt_adjusting(elems)) {  in mesh_sync_offset_rx_bcn_presp()
124 			  sta->sta.addr);  in mesh_sync_offset_rx_bcn_presp()
128 	/* Timing offset calculation (see 13.13.2.2.2) */  in mesh_sync_offset_rx_bcn_presp()
129 	t_t = le64_to_cpu(mgmt->u.beacon.timestamp);  in mesh_sync_offset_rx_bcn_presp()
130 	sta->mesh->t_offset = t_t - t_r;  in mesh_sync_offset_rx_bcn_presp()
133 		s64 t_clockdrift = sta->mesh->t_offset_setpoint - sta->mesh->t_offset;  in mesh_sync_offset_rx_bcn_presp()
136 			  sta->sta.addr, (long long) sta->mesh->t_offset,  in mesh_sync_offset_rx_bcn_presp()
137 			  (long long) sta->mesh->t_offset_setpoint,  in mesh_sync_offset_rx_bcn_presp()
141 		    t_clockdrift < -TOFFSET_MAXIMUM_ADJUSTMENT) {  in mesh_sync_offset_rx_bcn_presp()
144 				  sta->sta.addr,  in mesh_sync_offset_rx_bcn_presp()
150 		spin_lock_bh(&ifmsh->sync_offset_lock);  in mesh_sync_offset_rx_bcn_presp()
151 		if (t_clockdrift > ifmsh->sync_offset_clockdrift_max)  in mesh_sync_offset_rx_bcn_presp()
152 			ifmsh->sync_offset_clockdrift_max = t_clockdrift;  in mesh_sync_offset_rx_bcn_presp()
153 		spin_unlock_bh(&ifmsh->sync_offset_lock);  in mesh_sync_offset_rx_bcn_presp()
155 		sta->mesh->t_offset_setpoint = sta->mesh->t_offset - TOFFSET_SET_MARGIN;  in mesh_sync_offset_rx_bcn_presp()
159 			  sta->sta.addr,  in mesh_sync_offset_rx_bcn_presp()
160 			  (long long) sta->mesh->t_offset);  in mesh_sync_offset_rx_bcn_presp()
170 	struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;  in mesh_sync_offset_adjust_tsf()
172 	WARN_ON(ifmsh->mesh_sp_id != IEEE80211_SYNC_METHOD_NEIGHBOR_OFFSET);  in mesh_sync_offset_adjust_tsf()
175 	spin_lock_bh(&ifmsh->sync_offset_lock);  in mesh_sync_offset_adjust_tsf()
177 	if (ifmsh->sync_offset_clockdrift_max > TOFFSET_MINIMUM_ADJUSTMENT) {  in mesh_sync_offset_adjust_tsf()
181 		 * the tsf adjustment to the mesh tasklet  in mesh_sync_offset_adjust_tsf()
184 			  "TSF : kicking off TSF adjustment with clockdrift_max=%lld\n",  in mesh_sync_offset_adjust_tsf()
185 			  ifmsh->sync_offset_clockdrift_max);  in mesh_sync_offset_adjust_tsf()
186 		set_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags);  in mesh_sync_offset_adjust_tsf()
190 			  (long long)ifmsh->sync_offset_clockdrift_max);  in mesh_sync_offset_adjust_tsf()
191 		ifmsh->sync_offset_clockdrift_max = 0;  in mesh_sync_offset_adjust_tsf()
193 	spin_unlock_bh(&ifmsh->sync_offset_lock);  in mesh_sync_offset_adjust_tsf()