Channel switch finalization is now 2-step. First
step is when driver calls csa_finish(), the other
is when reservation is actually finalized (which
can be deferred for in-place reservation).
It is now safe to call ieee80211_csa_finish() more
than 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()
v7:
* tune commit message
* put the initial ieee80211_vif_chanctx_reservation_complete()
implementation here [Johannes]
* remove 'default' case and use all iftypes explicitly and WARN_ON
v8:
* fix typo in commit message [Johannes]
net/mac80211/cfg.c | 82 +++++++++++++++++++++++++++++++++++------------------
net/mac80211/chan.c | 35 +++++++++++++++++++++--
2 files changed, 88 insertions(+), 29 deletions(-)
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index c17e624..787254e 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -3126,17 +3126,35 @@ 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);
@@ -3172,6 +3190,7 @@ 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)
@@ -3183,6 +3202,7 @@ 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);
}
@@ -3328,7 +3348,7 @@ __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);
@@ -3343,37 +3363,43 @@ __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;
@@ -3391,7 +3417,9 @@ __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 2bac54a..fcbe9b9 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -1034,6 +1034,30 @@ int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
return 0;
}
+static void
+ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
+{
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_ADHOC:
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_MESH_POINT:
+ ieee80211_queue_work(&sdata->local->hw,
+ &sdata->csa_finalize_work);
+ break;
+ case NL80211_IFTYPE_UNSPECIFIED:
+ case NL80211_IFTYPE_STATION:
+ case NL80211_IFTYPE_AP_VLAN:
+ case NL80211_IFTYPE_WDS:
+ case NL80211_IFTYPE_MONITOR:
+ case NL80211_IFTYPE_P2P_CLIENT:
+ case NL80211_IFTYPE_P2P_GO:
+ case NL80211_IFTYPE_P2P_DEVICE:
+ case NUM_NL80211_IFTYPES:
+ WARN_ON(1);
+ break;
+ }
+}
+
static int
ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
{
@@ -1081,7 +1105,7 @@ ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
ieee80211_free_chanctx(local, new_ctx);
- return err;
+ goto out;
}
list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
@@ -1100,6 +1124,8 @@ ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
if (changed)
ieee80211_bss_info_change_notify(sdata, changed);
+out:
+ ieee80211_vif_chanctx_reservation_complete(sdata);
return err;
}
@@ -1144,6 +1170,7 @@ ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
}
out:
+ ieee80211_vif_chanctx_reservation_complete(sdata);
return err;
}
@@ -1364,6 +1391,8 @@ ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
list_move(&sdata->assigned_chanctx_list,
&new_ctx->assigned_vifs);
sdata->reserved_chanctx = NULL;
+
+ ieee80211_vif_chanctx_reservation_complete(sdata);
}
/*
@@ -1427,8 +1456,10 @@ err:
continue;
list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
- reserved_chanctx_list)
+ reserved_chanctx_list) {
ieee80211_vif_unreserve_chanctx(sdata);
+ ieee80211_vif_chanctx_reservation_complete(sdata);
+ }
}
return err;
--
1.8.5.3
--
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