Channel switch finalization is now 2-step. First
step is when driver calls csa_finish(), the other
is when reservation is actually finalized (which
be defered for in-place reservation).
It is now safe to call ieee80211_csa_finish() more
then once.
Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
---
Notes:
v3:
* fix lockdep typo s/mtx/chanctx_mtx/ [Johannes]
* fix comment style [Johannes]
* use goto for cleaner unlocking/returning [Johannes]
* squash with ieee80211_vif_change_channel() removal patch [Johannes]
* fix commit message [Johannes]
* add resilience for multiple ieee80211_csa_finish() calls
v4:
* split removal of ieee80211_vif_change_channel()
net/mac80211/cfg.c | 82 +++++++++++++++++++++++++++++++++++------------------
net/mac80211/chan.c | 11 ++++++-
2 files changed, 65 insertions(+), 28 deletions(-)
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index aab258b..b75014e 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3114,17 +3114,35 @@ static int __ieee80211_csa_finalize(struct ieee80211_sub_if_data *sdata)
sdata_assert_lock(sdata);
lockdep_assert_held(&local->mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
- sdata->radar_required = sdata->csa_radar_required;
- err = ieee80211_vif_change_channel(sdata, &changed);
- if (err < 0)
- return err;
+ /*
+ * 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 (!local->use_chanctx) {
- local->_oper_chandef = sdata->csa_chandef;
- ieee80211_hw_config(local, 0);
+ 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)
+ return 0;
+
+ err = ieee80211_vif_use_reserved_context(sdata);
+ if (err)
+ return err;
+
+ return 0;
}
+ if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
+ &sdata->csa_chandef))
+ return -EINVAL;
+
sdata->vif.csa_active = false;
err = ieee80211_set_after_csa_beacon(sdata, &changed);
@@ -3160,6 +3178,7 @@ void ieee80211_csa_finalize_work(struct work_struct *work)
sdata_lock(sdata);
mutex_lock(&local->mtx);
+ mutex_lock(&local->chanctx_mtx);
/* AP might have been stopped while waiting for the lock. */
if (!sdata->vif.csa_active)
@@ -3171,6 +3190,7 @@ void ieee80211_csa_finalize_work(struct work_struct *work)
ieee80211_csa_finalize(sdata);
unlock:
+ mutex_unlock(&local->chanctx_mtx);
mutex_unlock(&local->mtx);
sdata_unlock(sdata);
}
@@ -3314,7 +3334,7 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *chanctx;
- int err, num_chanctx, changed = 0;
+ int err, changed = 0;
sdata_assert_lock(sdata);
lockdep_assert_held(&local->mtx);
@@ -3329,37 +3349,43 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
&sdata->vif.bss_conf.chandef))
return -EINVAL;
+ /* don't allow another channel switch if one is already active. */
+ if (sdata->vif.csa_active)
+ return -EBUSY;
+
mutex_lock(&local->chanctx_mtx);
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (!conf) {
- mutex_unlock(&local->chanctx_mtx);
- return -EBUSY;
+ err = -EBUSY;
+ goto out;
}
- /* don't handle for multi-VIF cases */
chanctx = container_of(conf, struct ieee80211_chanctx, conf);
- if (ieee80211_chanctx_refcount(local, chanctx) > 1) {
- mutex_unlock(&local->chanctx_mtx);
- return -EBUSY;
+ if (!chanctx) {
+ err = -EBUSY;
+ goto out;
}
- num_chanctx = 0;
- list_for_each_entry_rcu(chanctx, &local->chanctx_list, list)
- num_chanctx++;
- mutex_unlock(&local->chanctx_mtx);
- if (num_chanctx > 1)
- return -EBUSY;
+ err = ieee80211_vif_reserve_chanctx(sdata, ¶ms->chandef,
+ chanctx->mode,
+ params->radar_required);
+ if (err)
+ goto out;
- /* don't allow another channel switch if one is already active. */
- if (sdata->vif.csa_active)
- return -EBUSY;
+ /* if reservation is invalid then this will fail */
+ err = ieee80211_check_combinations(sdata, NULL, chanctx->mode, 0);
+ if (err) {
+ ieee80211_vif_unreserve_chanctx(sdata);
+ goto out;
+ }
err = ieee80211_set_csa_beacon(sdata, params, &changed);
- if (err)
- return err;
+ if (err) {
+ ieee80211_vif_unreserve_chanctx(sdata);
+ goto out;
+ }
- sdata->csa_radar_required = params->radar_required;
sdata->csa_chandef = params->chandef;
sdata->csa_block_tx = params->block_tx;
sdata->vif.csa_active = true;
@@ -3377,7 +3403,9 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
ieee80211_csa_finalize(sdata);
}
- return 0;
+out:
+ mutex_unlock(&local->chanctx_mtx);
+ return err;
}
int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 3965470..6ca007f 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -966,7 +966,16 @@ int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
static void
ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
{
- /* stub */
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_ADHOC:
+ case NL80211_IFTYPE_MESH_POINT:
+ ieee80211_queue_work(&sdata->local->hw,
+ &sdata->csa_finalize_work);
+ break;
+ default:
+ break;
+ }
}
static int
--
1.8.5.3
--
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