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authorMichal Kazior <michal.kazior@tieto.com>2014-06-25 14:35:09 +0400
committerJohannes Berg <johannes.berg@intel.com>2014-06-25 20:06:20 +0400
commit4c3ebc56d7561526524ec62c61aa3e2040b71f6e (patch)
tree9fe45d875f637b6ba0a93829e6ffa492cba2a35d /net/mac80211/mlme.c
parent03078de4f928ffcbe629a914dea8bdf66a9d6a48 (diff)
downloadlinux-4c3ebc56d7561526524ec62c61aa3e2040b71f6e.tar.xz
mac80211: use chanctx reservation for STA CSA
Channel switch finalization is now 2-step. First step is when driver calls chswitch_done(), the other is when reservation is actually finalized (which be defered for in-place reservation). It is now safe to call ieee80211_chswitch_done() more than once. Also remove the ieee80211_vif_change_channel() because it is no longer used. Signed-off-by: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/mlme.c')
-rw-r--r--net/mac80211/mlme.c99
1 files changed, 65 insertions, 34 deletions
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index eccc8492a59c..931330bbe00c 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -940,52 +940,70 @@ static void ieee80211_chswitch_work(struct work_struct *work)
container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
- u32 changed = 0;
int ret;
if (!ieee80211_sdata_running(sdata))
return;
sdata_lock(sdata);
+ mutex_lock(&local->mtx);
+ mutex_lock(&local->chanctx_mtx);
+
if (!ifmgd->associated)
goto out;
- mutex_lock(&local->mtx);
- ret = ieee80211_vif_change_channel(sdata, &changed);
- mutex_unlock(&local->mtx);
- if (ret) {
+ if (!sdata->vif.csa_active)
+ goto out;
+
+ /*
+ * using reservation isn't immediate as it may be deferred until later
+ * with multi-vif. once reservation is complete it will re-schedule the
+ * work with no reserved_chanctx so verify chandef to check if it
+ * completed successfully
+ */
+
+ if (sdata->reserved_chanctx) {
+ /*
+ * with multi-vif csa driver may call ieee80211_csa_finish()
+ * many times while waiting for other interfaces to use their
+ * reservations
+ */
+ if (sdata->reserved_ready)
+ goto out;
+
+ ret = ieee80211_vif_use_reserved_context(sdata);
+ if (ret) {
+ sdata_info(sdata,
+ "failed to use reserved channel context, disconnecting (err=%d)\n",
+ ret);
+ ieee80211_queue_work(&sdata->local->hw,
+ &ifmgd->csa_connection_drop_work);
+ goto out;
+ }
+
+ goto out;
+ }
+
+ if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
+ &sdata->csa_chandef)) {
sdata_info(sdata,
- "vif channel switch failed, disconnecting\n");
+ "failed to finalize channel switch, disconnecting\n");
ieee80211_queue_work(&sdata->local->hw,
&ifmgd->csa_connection_drop_work);
goto out;
}
- if (!local->use_chanctx) {
- local->_oper_chandef = sdata->csa_chandef;
- /* Call "hw_config" only if doing sw channel switch.
- * Otherwise update the channel directly
- */
- if (!local->ops->channel_switch)
- ieee80211_hw_config(local, 0);
- else
- local->hw.conf.chandef = local->_oper_chandef;
- }
-
/* XXX: shouldn't really modify cfg80211-owned data! */
ifmgd->associated->channel = sdata->csa_chandef.chan;
- ieee80211_bss_info_change_notify(sdata, changed);
-
- mutex_lock(&local->mtx);
sdata->vif.csa_active = false;
+
/* XXX: wait for a beacon first? */
if (sdata->csa_block_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_block_tx = false;
}
- mutex_unlock(&local->mtx);
ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
@@ -993,6 +1011,8 @@ static void ieee80211_chswitch_work(struct work_struct *work)
ieee80211_sta_reset_conn_monitor(sdata);
out:
+ mutex_unlock(&local->chanctx_mtx);
+ mutex_unlock(&local->mtx);
sdata_unlock(sdata);
}
@@ -1029,6 +1049,7 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct cfg80211_bss *cbss = ifmgd->associated;
+ struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *chanctx;
enum ieee80211_band current_band;
struct ieee80211_csa_ie csa_ie;
@@ -1072,7 +1093,22 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
+ mutex_lock(&local->mtx);
mutex_lock(&local->chanctx_mtx);
+ conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
+ lockdep_is_held(&local->chanctx_mtx));
+ if (!conf) {
+ sdata_info(sdata,
+ "no channel context assigned to vif?, disconnecting\n");
+ ieee80211_queue_work(&local->hw,
+ &ifmgd->csa_connection_drop_work);
+ mutex_unlock(&local->chanctx_mtx);
+ mutex_unlock(&local->mtx);
+ return;
+ }
+
+ chanctx = container_of(conf, struct ieee80211_chanctx, conf);
+
if (local->use_chanctx) {
u32 num_chanctx = 0;
list_for_each_entry(chanctx, &local->chanctx_list, list)
@@ -1085,32 +1121,27 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
mutex_unlock(&local->chanctx_mtx);
+ mutex_unlock(&local->mtx);
return;
}
}
- if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
- ieee80211_queue_work(&local->hw,
- &ifmgd->csa_connection_drop_work);
- mutex_unlock(&local->chanctx_mtx);
- return;
- }
- chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
- struct ieee80211_chanctx, conf);
- if (ieee80211_chanctx_refcount(local, chanctx) > 1) {
+ res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
+ chanctx->mode, false);
+ if (res) {
sdata_info(sdata,
- "channel switch with multiple interfaces on the same channel, disconnecting\n");
+ "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
+ res);
ieee80211_queue_work(&local->hw,
&ifmgd->csa_connection_drop_work);
mutex_unlock(&local->chanctx_mtx);
+ mutex_unlock(&local->mtx);
return;
}
mutex_unlock(&local->chanctx_mtx);
- sdata->csa_chandef = csa_ie.chandef;
-
- mutex_lock(&local->mtx);
sdata->vif.csa_active = true;
+ sdata->csa_chandef = csa_ie.chandef;
sdata->csa_block_tx = csa_ie.mode;
if (sdata->csa_block_tx)