Commit 4c3ebc56 authored by Michal Kazior's avatar Michal Kazior Committed by Johannes Berg
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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: default avatarMichal Kazior <michal.kazior@tieto.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 03078de4

net/mac80211/chan.c

+4 −65
Original line number Diff line number Diff line
@@ -819,70 +819,6 @@ int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, 
	return ret;

}



static int __ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata,

					  struct ieee80211_chanctx *ctx,

					  u32 *changed)

{

	struct ieee80211_local *local = sdata->local;

	const struct cfg80211_chan_def *chandef = &sdata->csa_chandef;

	u32 chanctx_changed = 0;



	if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,

				     IEEE80211_CHAN_DISABLED))

		return -EINVAL;



	if (ieee80211_chanctx_refcount(local, ctx) != 1)

		return -EINVAL;



	if (sdata->vif.bss_conf.chandef.width != chandef->width) {

		chanctx_changed = IEEE80211_CHANCTX_CHANGE_WIDTH;

		*changed |= BSS_CHANGED_BANDWIDTH;

	}



	sdata->vif.bss_conf.chandef = *chandef;

	ctx->conf.def = *chandef;



	chanctx_changed |= IEEE80211_CHANCTX_CHANGE_CHANNEL;

	drv_change_chanctx(local, ctx, chanctx_changed);



	ieee80211_recalc_chanctx_chantype(local, ctx);

	ieee80211_recalc_smps_chanctx(local, ctx);

	ieee80211_recalc_radar_chanctx(local, ctx);

	ieee80211_recalc_chanctx_min_def(local, ctx);



	return 0;

}



int ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata,

				 u32 *changed)

{

	struct ieee80211_local *local = sdata->local;

	struct ieee80211_chanctx_conf *conf;

	struct ieee80211_chanctx *ctx;

	int ret;



	lockdep_assert_held(&local->mtx);



	/* should never be called if not performing a channel switch. */

	if (WARN_ON(!sdata->vif.csa_active))

		return -EINVAL;



	mutex_lock(&local->chanctx_mtx);

	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,

					 lockdep_is_held(&local->chanctx_mtx));

	if (!conf) {

		ret = -EINVAL;

		goto out;

	}



	ctx = container_of(conf, struct ieee80211_chanctx, conf);



	ret = __ieee80211_vif_change_channel(sdata, ctx, changed);

 out:

	mutex_unlock(&local->chanctx_mtx);

	return ret;

}



static void

__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,

				      bool clear)
@@ -1066,8 +1002,11 @@ ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata) 
		ieee80211_queue_work(&sdata->local->hw,

				     &sdata->csa_finalize_work);

		break;

	case NL80211_IFTYPE_UNSPECIFIED:

	case NL80211_IFTYPE_STATION:

		ieee80211_queue_work(&sdata->local->hw,

				     &sdata->u.mgd.chswitch_work);

		break;

	case NL80211_IFTYPE_UNSPECIFIED:

	case NL80211_IFTYPE_AP_VLAN:

	case NL80211_IFTYPE_WDS:

	case NL80211_IFTYPE_MONITOR:

net/mac80211/ieee80211_i.h

+0 −5
Original line number Diff line number Diff line
@@ -788,7 +788,6 @@ struct ieee80211_sub_if_data { 
	struct mac80211_qos_map __rcu *qos_map;



	struct work_struct csa_finalize_work;

	bool csa_radar_required;

	bool csa_block_tx; /* write-protected by sdata_lock and local->mtx */

	struct cfg80211_chan_def csa_chandef;
@@ -1850,10 +1849,6 @@ int __must_check 
ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,

			       const struct cfg80211_chan_def *chandef,

			       u32 *changed);

/* NOTE: only use ieee80211_vif_change_channel() for channel switch */

int __must_check

ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata,

			     u32 *changed);

void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata);

void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata);

void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,

net/mac80211/mlme.c

+65 −34
Original line number Diff line number Diff line
@@ -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 (!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,

			   "vif channel switch failed, disconnecting\n");

				   "failed to use reserved channel context, disconnecting (err=%d)\n",

				   ret);

			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;

		goto out;

	}



	if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,

					&sdata->csa_chandef)) {

		sdata_info(sdata,

			   "failed to finalize channel switch, disconnecting\n");

		ieee80211_queue_work(&sdata->local->hw,

				     &ifmgd->csa_connection_drop_work);

		goto out;

	}



	/* 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)

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