On starting a mesh or AP BSS, the interface dtim_count
countdown should match that of the driver TSF.
Signed-off-by: Thomas Pedersen <twpedersen@xxxxxxxxx>
---
v2:
adjust dtim_count instead of setting TSF=0
(Sergey)
v3:
handle interface types other than mesh, and drop
IBSS dtim calculation since mac80211 doesn't
support ad-hoc PS.
net/mac80211/cfg.c | 2 ++
net/mac80211/debugfs_netdev.c | 1 +
net/mac80211/ieee80211_i.h | 2 ++
net/mac80211/mesh.c | 1 +
net/mac80211/util.c | 40 ++++++++++++++++++++++++++++++++++++++++
5 files changed, 46 insertions(+)
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index ac18528..8211d30 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -951,6 +951,7 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
struct cfg80211_ap_settings *params)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+ struct ieee80211_local *local = sdata->local;
struct beacon_data *old;
struct ieee80211_sub_if_data *vlan;
u32 changed = BSS_CHANGED_BEACON_INT |
@@ -1030,6 +1031,7 @@ 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);
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 04b5a14..89160f7 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -468,6 +468,7 @@ static ssize_t ieee80211_if_parse_tsf(
}
}
+ ieee80211_recalc_dtim(local, sdata);
return buflen;
}
__IEEE80211_IF_FILE_W(tsf);
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 33ebe08..337fcad 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1794,6 +1794,8 @@ 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
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 5a74b24..5b919ca 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -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);
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 656648b..d51d6c1 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2588,3 +2588,43 @@ int ieee80211_cs_headroom(struct ieee80211_local *local,
return headroom;
}
+
+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;
+}
--
1.7.10.4
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