Commit 057d5f4b authored by Thomas Pedersen's avatar Thomas Pedersen Committed by Johannes Berg
Browse files

mac80211: sync dtim_count to TSF



On starting a mesh or AP BSS, the interface dtim_count
countdown should match that of the driver TSF.
Signed-off-by: default avatarThomas Pedersen <twpedersen@gmail.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 60a4fe0a
......@@ -1035,6 +1035,7 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
return err;
}
ieee80211_recalc_dtim(local, sdata);
ieee80211_bss_info_change_notify(sdata, changed);
netif_carrier_on(dev);
......
......@@ -474,6 +474,7 @@ static ssize_t ieee80211_if_parse_tsf(
}
}
ieee80211_recalc_dtim(local, sdata);
return buflen;
}
IEEE80211_IF_FILE_RW(tsf);
......
......@@ -1800,6 +1800,8 @@ ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
int ieee80211_cs_headroom(struct ieee80211_local *local,
struct cfg80211_crypto_settings *crypto,
enum nl80211_iftype iftype);
void ieee80211_recalc_dtim(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata);
#ifdef CONFIG_MAC80211_NOINLINE
#define debug_noinline noinline
......
......@@ -807,6 +807,7 @@ int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
return -ENOMEM;
}
ieee80211_recalc_dtim(local, sdata);
ieee80211_bss_info_change_notify(sdata, changed);
netif_carrier_on(sdata->dev);
......
......@@ -2734,3 +2734,44 @@ int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
return ret;
}
EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
void ieee80211_recalc_dtim(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata)
{
u64 tsf = drv_get_tsf(local, sdata);
u64 dtim_count = 0;
u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
u8 dtim_period = sdata->vif.bss_conf.dtim_period;
struct ps_data *ps;
u8 bcns_from_dtim;
if (tsf == -1ULL || !beacon_int || !dtim_period)
return;
if (sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
if (!sdata->bss)
return;
ps = &sdata->bss->ps;
} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
ps = &sdata->u.mesh.ps;
} else {
return;
}
/*
* actually finds last dtim_count, mac80211 will update in
* __beacon_add_tim().
* dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
*/
do_div(tsf, beacon_int);
bcns_from_dtim = do_div(tsf, dtim_period);
/* just had a DTIM */
if (!bcns_from_dtim)
dtim_count = 0;
else
dtim_count = dtim_period - bcns_from_dtim;
ps->dtim_count = dtim_count;
}
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