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wifi: mac80211: move color collision detection report in a delayed work

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Move color collision report in a dedicated delayed work and do not run
it in interrupt context in order to rate-limit the number of events
reported to userspace. Moreover grab wdev mutex in
ieee80211_color_collision_detection_work routine since it is required
by cfg80211_obss_color_collision_notify().

Tested-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Fixes: 5f9404abdf ("mac80211: add support for BSS color change")
Link: https://lore.kernel.org/r/3f6cf60c892ad40c1cca4a55d62b1224ef1c6ce9.1674644379.git.lorenzo@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Lorenzo Bianconi 2023-01-25 12:01:02 +01:00 committed by Johannes Berg
parent 015b8cc5e7
commit 9288188438
3 changed files with 31 additions and 1 deletions
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26
net/mac80211/cfg.c
View File

@ -4652,6 +4652,20 @@ unlock:
sdata_unlock(sdata);
}
void ieee80211_color_collision_detection_work(struct work_struct *work)
{
struct delayed_work *delayed_work = to_delayed_work(work);
struct ieee80211_link_data *link =
container_of(delayed_work, struct ieee80211_link_data,
color_collision_detect_work);
struct ieee80211_sub_if_data *sdata = link->sdata;
sdata_lock(sdata);
cfg80211_obss_color_collision_notify(sdata->dev, link->color_bitmap,
GFP_KERNEL);
sdata_unlock(sdata);
}
void ieee80211_color_change_finish(struct ieee80211_vif *vif)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
@ -4666,11 +4680,21 @@ ieee80211_obss_color_collision_notify(struct ieee80211_vif *vif,
u64 color_bitmap, gfp_t gfp)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct ieee80211_link_data *link = &sdata->deflink;
if (sdata->vif.bss_conf.color_change_active || sdata->vif.bss_conf.csa_active)
return;
cfg80211_obss_color_collision_notify(sdata->dev, color_bitmap, gfp);
if (delayed_work_pending(&link->color_collision_detect_work))
return;
link->color_bitmap = color_bitmap;
/* queue the color collision detection event every 500 ms in order to
* avoid sending too much netlink messages to userspace.
*/
ieee80211_queue_delayed_work(&sdata->local->hw,
&link->color_collision_detect_work,
msecs_to_jiffies(500));
}
EXPORT_SYMBOL_GPL(ieee80211_obss_color_collision_notify);

3
net/mac80211/ieee80211_i.h
View File

@ -974,6 +974,8 @@ struct ieee80211_link_data {
struct cfg80211_chan_def csa_chandef;
struct work_struct color_change_finalize_work;
struct delayed_work color_collision_detect_work;
u64 color_bitmap;
/* context reservation -- protected with chanctx_mtx */
struct ieee80211_chanctx *reserved_chanctx;
@ -1929,6 +1931,7 @@ int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
/* color change handling */
void ieee80211_color_change_finalize_work(struct work_struct *work);
void ieee80211_color_collision_detection_work(struct work_struct *work);
/* interface handling */
#define MAC80211_SUPPORTED_FEATURES_TX (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | \

3
net/mac80211/link.c
View File

@ -39,6 +39,8 @@ void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
ieee80211_csa_finalize_work);
INIT_WORK(&link->color_change_finalize_work,
ieee80211_color_change_finalize_work);
INIT_DELAYED_WORK(&link->color_collision_detect_work,
ieee80211_color_collision_detection_work);
INIT_LIST_HEAD(&link->assigned_chanctx_list);
INIT_LIST_HEAD(&link->reserved_chanctx_list);
INIT_DELAYED_WORK(&link->dfs_cac_timer_work,
@ -66,6 +68,7 @@ void ieee80211_link_stop(struct ieee80211_link_data *link)
if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
ieee80211_mgd_stop_link(link);
cancel_delayed_work_sync(&link->color_collision_detect_work);
ieee80211_link_release_channel(link);
}