--- /dev/null
+From: Maharaja Kennadyrajan <maharaja.kennadyrajan@oss.qualcomm.com>
+Date: Fri, 18 Jul 2025 11:38:35 +0530
+Subject: [PATCH] wifi: mac80211: Add link iteration macro for link data
+ with rcu_dereference
+
+Currently, the existing macro for_each_link_data() uses sdata_dereference()
+which requires the wiphy lock. This lock cannot be used in atomic or RCU
+read-side contexts, such as in the RX path.
+
+Introduce a new macro, for_each_link_data_rcu(), that iterates over link of
+sdata using rcu_dereference(), making it safe to use in RCU contexts. This
+allows callers to access link data without requiring the wiphy lock.
+
+The macro takes into account the vif.valid_links bitmap and ensures only
+valid links are accessed safely. Callers are responsible for ensuring that
+rcu_read_lock() is held when using this macro.
+
+Signed-off-by: Maharaja Kennadyrajan <maharaja.kennadyrajan@oss.qualcomm.com>
+Link: https://patch.msgid.link/20250718060837.59371-3-maharaja.kennadyrajan@oss.qualcomm.com
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/net/mac80211/ieee80211_i.h
++++ b/net/mac80211/ieee80211_i.h
+@@ -1211,6 +1211,30 @@ struct ieee80211_sub_if_data *vif_to_sda
+ if ((_link = wiphy_dereference((local)->hw.wiphy, \
+ ___sdata->link[___link_id])))
+
++#define for_each_link_data(sdata, __link) \
++ /* outer loop just to define the variable ... */ \
++ for (struct ieee80211_sub_if_data *__sdata = (sdata); __sdata; \
++ __sdata = NULL /* always stop */) \
++ for (int __link_id = 0; \
++ __link_id < ARRAY_SIZE((__sdata)->link); __link_id++) \
++ if ((!(__sdata)->vif.valid_links || \
++ (__sdata)->vif.valid_links & BIT(__link_id)) && \
++ ((__link) = sdata_dereference((__sdata)->link[__link_id], \
++ (__sdata))))
++
++/*
++ * for_each_link_data_rcu should be used under RCU read lock.
++ */
++#define for_each_link_data_rcu(sdata, __link) \
++ /* outer loop just to define the variable ... */ \
++ for (struct ieee80211_sub_if_data *__sdata = (sdata); __sdata; \
++ __sdata = NULL /* always stop */) \
++ for (int __link_id = 0; \
++ __link_id < ARRAY_SIZE((__sdata)->link); __link_id++) \
++ if ((!(__sdata)->vif.valid_links || \
++ (__sdata)->vif.valid_links & BIT(__link_id)) && \
++ ((__link) = rcu_dereference((__sdata)->link[__link_id]))) \
++
+ static inline int
+ ieee80211_get_mbssid_beacon_len(struct cfg80211_mbssid_elems *elems,
+ struct cfg80211_rnr_elems *rnr_elems,
--- /dev/null
+From: Maharaja Kennadyrajan <maharaja.kennadyrajan@oss.qualcomm.com>
+Date: Fri, 18 Jul 2025 11:38:36 +0530
+Subject: [PATCH] wifi: mac80211: extend beacon monitoring for MLO
+
+Currently, reset beacon monitor (ieee80211_sta_reset_beacon_monitor())
+timer is handled only for non-AP non-MLD STA and do not support non-AP MLD
+STA. When the beacon loss occurs in non-AP MLD STA with the current
+implementation, it is treated as a single link and the timer will reset
+based on the timeout of the deflink, without checking all the links.
+
+Check the CSA flags for all the links in the MLO and decide whether to
+schedule the work queue for beacon loss. If any of the links has CSA
+active, then beacon loss work is not scheduled.
+
+Also, call the functions ieee80211_sta_reset_beacon_monitor() and
+ieee80211_sta_reset_conn_monitor() from ieee80211_csa_switch_work() only
+when all the links are CSA active.
+
+Signed-off-by: Maharaja Kennadyrajan <maharaja.kennadyrajan@oss.qualcomm.com>
+Link: https://patch.msgid.link/20250718060837.59371-4-maharaja.kennadyrajan@oss.qualcomm.com
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/net/mac80211/mlme.c
++++ b/net/mac80211/mlme.c
+@@ -2159,6 +2159,21 @@ static void ieee80211_csa_switch_work(st
+ }
+ }
+
++ /*
++ * It is not necessary to reset these timers if any link does not
++ * have an active CSA and that link still receives the beacons
++ * when other links have active CSA.
++ */
++ for_each_link_data(sdata, link) {
++ if (!link->conf->csa_active)
++ return;
++ }
++
++ /*
++ * Reset the beacon monitor and connection monitor timers when CSA
++ * is active for all links in MLO when channel switch occurs in all
++ * the links.
++ */
+ ieee80211_sta_reset_beacon_monitor(sdata);
+ ieee80211_sta_reset_conn_monitor(sdata);
+ }
+@@ -7863,6 +7878,29 @@ void ieee80211_sta_work(struct ieee80211
+ }
+ }
+
++static bool
++ieee80211_is_csa_in_progress(struct ieee80211_sub_if_data *sdata)
++{
++ /*
++ * In MLO, check the CSA flags 'active' and 'waiting_bcn' for all
++ * the links.
++ */
++ struct ieee80211_link_data *link;
++ bool ret = true;
++
++ rcu_read_lock();
++ for_each_link_data_rcu(sdata, link) {
++ if (!(link->conf->csa_active &&
++ !link->u.mgd.csa.waiting_bcn)) {
++ ret = false;
++ break;
++ }
++ }
++ rcu_read_unlock();
++
++ return ret;
++}
++
+ static void ieee80211_sta_bcn_mon_timer(struct timer_list *t)
+ {
+ struct ieee80211_sub_if_data *sdata =
--- /dev/null
+From: Maharaja Kennadyrajan <maharaja.kennadyrajan@oss.qualcomm.com>
+Date: Fri, 18 Jul 2025 11:38:37 +0530
+Subject: [PATCH] wifi: mac80211: extend connection monitoring for MLO
+
+Currently, reset connection monitor (ieee80211_sta_reset_conn_monitor())
+timer is handled only for non-AP non-MLD STA and do not support non-AP MLD
+STA. The current implementation checks for the CSA active and update the
+monitor timer with the timeout value of deflink and reset the timer based
+on the deflink's timeout value else schedule the connection loss work when
+the deflink is timed out and it won't work for the non-AP MLD STA.
+
+Handle the reset connection monitor timer for non-AP MLD STA by updating
+the monitor timer with the timeout value which is determined based on the
+link that will expire last among all the links in MLO. If at least one link
+has not timed out, the timer is updated accordingly with the latest timeout
+value else schedule the connection loss work when all links have timed out.
+
+Remove the MLO-related WARN_ON() checks in the beacon and connection
+monitoring logic code paths as they support MLO now.
+
+Signed-off-by: Maharaja Kennadyrajan <maharaja.kennadyrajan@oss.qualcomm.com>
+Link: https://patch.msgid.link/20250718060837.59371-5-maharaja.kennadyrajan@oss.qualcomm.com
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/net/mac80211/mlme.c
++++ b/net/mac80211/mlme.c
+@@ -3831,9 +3831,6 @@ static void ieee80211_mgd_probe_ap_send(
+
+ lockdep_assert_wiphy(sdata->local->hw.wiphy);
+
+- if (WARN_ON(ieee80211_vif_is_mld(&sdata->vif)))
+- return;
+-
+ /*
+ * Try sending broadcast probe requests for the last three
+ * probe requests after the first ones failed since some
+@@ -3879,9 +3876,6 @@ static void ieee80211_mgd_probe_ap(struc
+
+ lockdep_assert_wiphy(sdata->local->hw.wiphy);
+
+- if (WARN_ON_ONCE(ieee80211_vif_is_mld(&sdata->vif)))
+- return;
+-
+ if (!ieee80211_sdata_running(sdata))
+ return;
+
+@@ -7921,36 +7915,73 @@ static void ieee80211_sta_bcn_mon_timer(
+ &sdata->u.mgd.beacon_connection_loss_work);
+ }
+
++static unsigned long
++ieee80211_latest_active_link_conn_timeout(struct ieee80211_sub_if_data *sdata)
++{
++ unsigned long latest_timeout = 0;
++ unsigned int link_id;
++ struct sta_info *sta;
++
++ rcu_read_lock();
++
++ sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
++ if (!sta)
++ goto out;
++
++ for (link_id = 0; link_id < ARRAY_SIZE(sta->link);
++ link_id++) {
++ struct link_sta_info *link_sta;
++ unsigned long timeout;
++
++ link_sta = rcu_dereference(sta->link[link_id]);
++ if (!link_sta)
++ continue;
++
++ timeout = link_sta->status_stats.last_ack;
++ if (time_before(timeout, link_sta->rx_stats.last_rx))
++ timeout = link_sta->rx_stats.last_rx;
++
++ timeout += IEEE80211_CONNECTION_IDLE_TIME;
++
++ /*
++ * latest_timeout holds the timeout of the link
++ * that will expire last among all links in an
++ * non-AP MLD STA. This ensures that the connection
++ * monitor timer is only reset if at least one link
++ * is still active, and it is scheduled to fire at
++ * the latest possible timeout.
++ */
++ if (time_is_after_jiffies(timeout) &&
++ time_after(timeout, latest_timeout))
++ latest_timeout = timeout;
++ }
++
++out:
++ rcu_read_unlock();
++
++ return latest_timeout;
++}
++
+ static void ieee80211_sta_conn_mon_timer(struct timer_list *t)
+ {
+ struct ieee80211_sub_if_data *sdata =
+ from_timer(sdata, t, u.mgd.conn_mon_timer);
+ struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+ struct ieee80211_local *local = sdata->local;
+- struct sta_info *sta;
+- unsigned long timeout;
++ unsigned long latest_timeout;
+
+- if (WARN_ON(ieee80211_vif_is_mld(&sdata->vif)))
++ if (ieee80211_is_csa_in_progress(sdata))
+ return;
+
+- if (sdata->vif.bss_conf.csa_active &&
+- !sdata->deflink.u.mgd.csa.waiting_bcn)
+- return;
+-
+- sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
+- if (!sta)
+- return;
+-
+- timeout = sta->deflink.status_stats.last_ack;
+- if (time_before(sta->deflink.status_stats.last_ack, sta->deflink.rx_stats.last_rx))
+- timeout = sta->deflink.rx_stats.last_rx;
+- timeout += IEEE80211_CONNECTION_IDLE_TIME;
++ latest_timeout = ieee80211_latest_active_link_conn_timeout(sdata);
+
+- /* If timeout is after now, then update timer to fire at
+- * the later date, but do not actually probe at this time.
+- */
+- if (time_is_after_jiffies(timeout)) {
+- mod_timer(&ifmgd->conn_mon_timer, round_jiffies_up(timeout));
++ /*
++ * If latest timeout is after now, then update timer to fire at
++ * the later date, but do not actually probe at this time.
++ */
++ if (latest_timeout) {
++ mod_timer(&ifmgd->conn_mon_timer,
++ round_jiffies_up(latest_timeout));
+ return;
+ }
+
--- /dev/null
+From: Lorenzo Bianconi <lorenzo@kernel.org>
+Date: Tue, 26 Aug 2025 13:54:31 +0200
+Subject: [PATCH] wifi: mac80211: Make CONNECTION_MONITOR optional for MLO sta
+
+Since commit '1bc892d76a6f ("wifi: mac80211: extend connection
+monitoring for MLO")' mac80211 supports connection monitor for MLO
+client interfaces. Remove the CONNECTION_MONITOR requirement in
+ieee80211_register_hw routine.
+
+Fixes: 1bc892d76a6f ("wifi: mac80211: extend connection monitoring for MLO")
+Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
+---
+
+--- a/net/mac80211/main.c
++++ b/net/mac80211/main.c
+@@ -1174,9 +1174,6 @@ int ieee80211_register_hw(struct ieee802
+ if (WARN_ON(!ieee80211_hw_check(hw, MFP_CAPABLE)))
+ return -EINVAL;
+
+- if (WARN_ON(!ieee80211_hw_check(hw, CONNECTION_MONITOR)))
+- return -EINVAL;
+-
+ if (WARN_ON(ieee80211_hw_check(hw, NEED_DTIM_BEFORE_ASSOC)))
+ return -EINVAL;
+
projects / thirdparty / openwrt.git / commitdiff
