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mac80211: use chanctx reservation for AP CSA

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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@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michal Kazior
2014-06-25 12:35:08 +02:00
committed by Johannes Berg
parent 71e6195ed2
commit 03078de4f9
2 changed files with 96 additions and 37 deletions
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98
net/mac80211/cfg.c
View File

@@ -2792,17 +2792,35 @@ 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);
@@ -2839,6 +2857,7 @@ 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)
@@ -2850,6 +2869,7 @@ 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);
}
@@ -2995,7 +3015,7 @@ __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);
@@ -3010,37 +3030,43 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
&sdata->vif.bss_conf.chandef))
return -EINVAL;
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;
}
/* 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;
}
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;
/* don't allow another channel switch if one is already active. */
if (sdata->vif.csa_active)
return -EBUSY;
err = ieee80211_set_csa_beacon(sdata, params, &changed);
if (err)
return err;
mutex_lock(&local->chanctx_mtx);
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (!conf) {
err = -EBUSY;
goto out;
}
chanctx = container_of(conf, struct ieee80211_chanctx, conf);
if (!chanctx) {
err = -EBUSY;
goto out;
}
err = ieee80211_vif_reserve_chanctx(sdata, &params->chandef,
chanctx->mode,
params->radar_required);
if (err)
goto out;
/* 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) {
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;
@@ -3057,7 +3083,9 @@ __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,