v4.19.13 snapshot.
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
new file mode 100644
index 0000000..d9558ff
--- /dev/null
+++ b/net/mac80211/chan.c
@@ -0,0 +1,1796 @@
+/*
+ * mac80211 - channel management
+ */
+
+#include <linux/nl80211.h>
+#include <linux/export.h>
+#include <linux/rtnetlink.h>
+#include <net/cfg80211.h>
+#include "ieee80211_i.h"
+#include "driver-ops.h"
+
+static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ struct ieee80211_sub_if_data *sdata;
+ int num = 0;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
+ num++;
+
+ return num;
+}
+
+static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ struct ieee80211_sub_if_data *sdata;
+ int num = 0;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
+ num++;
+
+ return num;
+}
+
+int ieee80211_chanctx_refcount(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ return ieee80211_chanctx_num_assigned(local, ctx) +
+ ieee80211_chanctx_num_reserved(local, ctx);
+}
+
+static int ieee80211_num_chanctx(struct ieee80211_local *local)
+{
+ struct ieee80211_chanctx *ctx;
+ int num = 0;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ list_for_each_entry(ctx, &local->chanctx_list, list)
+ num++;
+
+ return num;
+}
+
+static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
+{
+ lockdep_assert_held(&local->chanctx_mtx);
+ return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
+}
+
+static struct ieee80211_chanctx *
+ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local __maybe_unused = sdata->local;
+ struct ieee80211_chanctx_conf *conf;
+
+ conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
+ lockdep_is_held(&local->chanctx_mtx));
+ if (!conf)
+ return NULL;
+
+ return container_of(conf, struct ieee80211_chanctx, conf);
+}
+
+static const struct cfg80211_chan_def *
+ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx,
+ const struct cfg80211_chan_def *compat)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ list_for_each_entry(sdata, &ctx->reserved_vifs,
+ reserved_chanctx_list) {
+ if (!compat)
+ compat = &sdata->reserved_chandef;
+
+ compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
+ compat);
+ if (!compat)
+ break;
+ }
+
+ return compat;
+}
+
+static const struct cfg80211_chan_def *
+ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx,
+ const struct cfg80211_chan_def *compat)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ list_for_each_entry(sdata, &ctx->assigned_vifs,
+ assigned_chanctx_list) {
+ if (sdata->reserved_chanctx != NULL)
+ continue;
+
+ if (!compat)
+ compat = &sdata->vif.bss_conf.chandef;
+
+ compat = cfg80211_chandef_compatible(
+ &sdata->vif.bss_conf.chandef, compat);
+ if (!compat)
+ break;
+ }
+
+ return compat;
+}
+
+static const struct cfg80211_chan_def *
+ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx,
+ const struct cfg80211_chan_def *compat)
+{
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
+ if (!compat)
+ return NULL;
+
+ compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
+ if (!compat)
+ return NULL;
+
+ return compat;
+}
+
+static bool
+ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx,
+ const struct cfg80211_chan_def *def)
+{
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ if (ieee80211_chanctx_combined_chandef(local, ctx, def))
+ return true;
+
+ if (!list_empty(&ctx->reserved_vifs) &&
+ ieee80211_chanctx_reserved_chandef(local, ctx, def))
+ return true;
+
+ return false;
+}
+
+static struct ieee80211_chanctx *
+ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
+ const struct cfg80211_chan_def *chandef,
+ enum ieee80211_chanctx_mode mode)
+{
+ struct ieee80211_chanctx *ctx;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
+ return NULL;
+
+ list_for_each_entry(ctx, &local->chanctx_list, list) {
+ if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
+ continue;
+
+ if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
+ continue;
+
+ if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
+ chandef))
+ continue;
+
+ return ctx;
+ }
+
+ return NULL;
+}
+
+enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)
+{
+ switch (sta->bandwidth) {
+ case IEEE80211_STA_RX_BW_20:
+ if (sta->ht_cap.ht_supported)
+ return NL80211_CHAN_WIDTH_20;
+ else
+ return NL80211_CHAN_WIDTH_20_NOHT;
+ case IEEE80211_STA_RX_BW_40:
+ return NL80211_CHAN_WIDTH_40;
+ case IEEE80211_STA_RX_BW_80:
+ return NL80211_CHAN_WIDTH_80;
+ case IEEE80211_STA_RX_BW_160:
+ /*
+ * This applied for both 160 and 80+80. since we use
+ * the returned value to consider degradation of
+ * ctx->conf.min_def, we have to make sure to take
+ * the bigger one (NL80211_CHAN_WIDTH_160).
+ * Otherwise we might try degrading even when not
+ * needed, as the max required sta_bw returned (80+80)
+ * might be smaller than the configured bw (160).
+ */
+ return NL80211_CHAN_WIDTH_160;
+ default:
+ WARN_ON(1);
+ return NL80211_CHAN_WIDTH_20;
+ }
+}
+
+static enum nl80211_chan_width
+ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
+{
+ enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
+ struct sta_info *sta;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
+ if (sdata != sta->sdata &&
+ !(sta->sdata->bss && sta->sdata->bss == sdata->bss))
+ continue;
+
+ max_bw = max(max_bw, ieee80211_get_sta_bw(&sta->sta));
+ }
+ rcu_read_unlock();
+
+ return max_bw;
+}
+
+static enum nl80211_chan_width
+ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
+ struct ieee80211_chanctx_conf *conf)
+{
+ struct ieee80211_sub_if_data *sdata;
+ enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ struct ieee80211_vif *vif = &sdata->vif;
+ enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
+
+ if (!ieee80211_sdata_running(sdata))
+ continue;
+
+ if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
+ continue;
+
+ switch (vif->type) {
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_AP_VLAN:
+ width = ieee80211_get_max_required_bw(sdata);
+ break;
+ case NL80211_IFTYPE_STATION:
+ /*
+ * The ap's sta->bandwidth is not set yet at this
+ * point, so take the width from the chandef, but
+ * account also for TDLS peers
+ */
+ width = max(vif->bss_conf.chandef.width,
+ ieee80211_get_max_required_bw(sdata));
+ break;
+ case NL80211_IFTYPE_P2P_DEVICE:
+ case NL80211_IFTYPE_NAN:
+ continue;
+ case NL80211_IFTYPE_ADHOC:
+ case NL80211_IFTYPE_WDS:
+ case NL80211_IFTYPE_MESH_POINT:
+ case NL80211_IFTYPE_OCB:
+ width = vif->bss_conf.chandef.width;
+ break;
+ case NL80211_IFTYPE_UNSPECIFIED:
+ case NUM_NL80211_IFTYPES:
+ case NL80211_IFTYPE_MONITOR:
+ case NL80211_IFTYPE_P2P_CLIENT:
+ case NL80211_IFTYPE_P2P_GO:
+ WARN_ON_ONCE(1);
+ }
+ max_bw = max(max_bw, width);
+ }
+
+ /* use the configured bandwidth in case of monitor interface */
+ sdata = rcu_dereference(local->monitor_sdata);
+ if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
+ max_bw = max(max_bw, conf->def.width);
+
+ rcu_read_unlock();
+
+ return max_bw;
+}
+
+/*
+ * recalc the min required chan width of the channel context, which is
+ * the max of min required widths of all the interfaces bound to this
+ * channel context.
+ */
+void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ enum nl80211_chan_width max_bw;
+ struct cfg80211_chan_def min_def;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ /* don't optimize 5MHz, 10MHz, and radar_enabled confs */
+ if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
+ ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
+ ctx->conf.radar_enabled) {
+ ctx->conf.min_def = ctx->conf.def;
+ return;
+ }
+
+ max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
+
+ /* downgrade chandef up to max_bw */
+ min_def = ctx->conf.def;
+ while (min_def.width > max_bw)
+ ieee80211_chandef_downgrade(&min_def);
+
+ if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
+ return;
+
+ ctx->conf.min_def = min_def;
+ if (!ctx->driver_present)
+ return;
+
+ drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
+}
+
+static void ieee80211_change_chanctx(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx,
+ const struct cfg80211_chan_def *chandef)
+{
+ if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
+ ieee80211_recalc_chanctx_min_def(local, ctx);
+ return;
+ }
+
+ WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
+
+ ctx->conf.def = *chandef;
+ drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
+ ieee80211_recalc_chanctx_min_def(local, ctx);
+
+ if (!local->use_chanctx) {
+ local->_oper_chandef = *chandef;
+ ieee80211_hw_config(local, 0);
+ }
+}
+
+static struct ieee80211_chanctx *
+ieee80211_find_chanctx(struct ieee80211_local *local,
+ const struct cfg80211_chan_def *chandef,
+ enum ieee80211_chanctx_mode mode)
+{
+ struct ieee80211_chanctx *ctx;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
+ return NULL;
+
+ list_for_each_entry(ctx, &local->chanctx_list, list) {
+ const struct cfg80211_chan_def *compat;
+
+ if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
+ continue;
+
+ if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
+ continue;
+
+ compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
+ if (!compat)
+ continue;
+
+ compat = ieee80211_chanctx_reserved_chandef(local, ctx,
+ compat);
+ if (!compat)
+ continue;
+
+ ieee80211_change_chanctx(local, ctx, compat);
+
+ return ctx;
+ }
+
+ return NULL;
+}
+
+bool ieee80211_is_radar_required(struct ieee80211_local *local)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ lockdep_assert_held(&local->mtx);
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ if (sdata->radar_required) {
+ rcu_read_unlock();
+ return true;
+ }
+ }
+ rcu_read_unlock();
+
+ return false;
+}
+
+static bool
+ieee80211_chanctx_radar_required(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ struct ieee80211_chanctx_conf *conf = &ctx->conf;
+ struct ieee80211_sub_if_data *sdata;
+ bool required = false;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+ lockdep_assert_held(&local->mtx);
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ if (!ieee80211_sdata_running(sdata))
+ continue;
+ if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
+ continue;
+ if (!sdata->radar_required)
+ continue;
+
+ required = true;
+ break;
+ }
+ rcu_read_unlock();
+
+ return required;
+}
+
+static struct ieee80211_chanctx *
+ieee80211_alloc_chanctx(struct ieee80211_local *local,
+ const struct cfg80211_chan_def *chandef,
+ enum ieee80211_chanctx_mode mode)
+{
+ struct ieee80211_chanctx *ctx;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
+ if (!ctx)
+ return NULL;
+
+ INIT_LIST_HEAD(&ctx->assigned_vifs);
+ INIT_LIST_HEAD(&ctx->reserved_vifs);
+ ctx->conf.def = *chandef;
+ ctx->conf.rx_chains_static = 1;
+ ctx->conf.rx_chains_dynamic = 1;
+ ctx->mode = mode;
+ ctx->conf.radar_enabled = false;
+ ieee80211_recalc_chanctx_min_def(local, ctx);
+
+ return ctx;
+}
+
+static int ieee80211_add_chanctx(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ u32 changed;
+ int err;
+
+ lockdep_assert_held(&local->mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ if (!local->use_chanctx)
+ local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
+
+ /* turn idle off *before* setting channel -- some drivers need that */
+ changed = ieee80211_idle_off(local);
+ if (changed)
+ ieee80211_hw_config(local, changed);
+
+ if (!local->use_chanctx) {
+ local->_oper_chandef = ctx->conf.def;
+ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+ } else {
+ err = drv_add_chanctx(local, ctx);
+ if (err) {
+ ieee80211_recalc_idle(local);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static struct ieee80211_chanctx *
+ieee80211_new_chanctx(struct ieee80211_local *local,
+ const struct cfg80211_chan_def *chandef,
+ enum ieee80211_chanctx_mode mode)
+{
+ struct ieee80211_chanctx *ctx;
+ int err;
+
+ lockdep_assert_held(&local->mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ ctx = ieee80211_alloc_chanctx(local, chandef, mode);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ err = ieee80211_add_chanctx(local, ctx);
+ if (err) {
+ kfree(ctx);
+ return ERR_PTR(err);
+ }
+
+ list_add_rcu(&ctx->list, &local->chanctx_list);
+ return ctx;
+}
+
+static void ieee80211_del_chanctx(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ if (!local->use_chanctx) {
+ struct cfg80211_chan_def *chandef = &local->_oper_chandef;
+ chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
+ chandef->center_freq1 = chandef->chan->center_freq;
+ chandef->center_freq2 = 0;
+
+ /* NOTE: Disabling radar is only valid here for
+ * single channel context. To be sure, check it ...
+ */
+ WARN_ON(local->hw.conf.radar_enabled &&
+ !list_empty(&local->chanctx_list));
+
+ local->hw.conf.radar_enabled = false;
+
+ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+ } else {
+ drv_remove_chanctx(local, ctx);
+ }
+
+ ieee80211_recalc_idle(local);
+}
+
+static void ieee80211_free_chanctx(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
+
+ list_del_rcu(&ctx->list);
+ ieee80211_del_chanctx(local, ctx);
+ kfree_rcu(ctx, rcu_head);
+}
+
+void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
+{
+ struct ieee80211_chanctx_conf *conf = &ctx->conf;
+ struct ieee80211_sub_if_data *sdata;
+ const struct cfg80211_chan_def *compat = NULL;
+ struct sta_info *sta;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+
+ if (!ieee80211_sdata_running(sdata))
+ continue;
+ if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
+ continue;
+ if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+ continue;
+
+ if (!compat)
+ compat = &sdata->vif.bss_conf.chandef;
+
+ compat = cfg80211_chandef_compatible(
+ &sdata->vif.bss_conf.chandef, compat);
+ if (WARN_ON_ONCE(!compat))
+ break;
+ }
+
+ /* TDLS peers can sometimes affect the chandef width */
+ list_for_each_entry_rcu(sta, &local->sta_list, list) {
+ if (!sta->uploaded ||
+ !test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
+ !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
+ !sta->tdls_chandef.chan)
+ continue;
+
+ compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
+ compat);
+ if (WARN_ON_ONCE(!compat))
+ break;
+ }
+ rcu_read_unlock();
+
+ if (!compat)
+ return;
+
+ ieee80211_change_chanctx(local, ctx, compat);
+}
+
+static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
+ struct ieee80211_chanctx *chanctx)
+{
+ bool radar_enabled;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+ /* for ieee80211_is_radar_required */
+ lockdep_assert_held(&local->mtx);
+
+ radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
+
+ if (radar_enabled == chanctx->conf.radar_enabled)
+ return;
+
+ chanctx->conf.radar_enabled = radar_enabled;
+
+ if (!local->use_chanctx) {
+ local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
+ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+ }
+
+ drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
+}
+
+static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_chanctx *new_ctx)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx_conf *conf;
+ struct ieee80211_chanctx *curr_ctx = NULL;
+ int ret = 0;
+
+ if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
+ return -ENOTSUPP;
+
+ conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
+ lockdep_is_held(&local->chanctx_mtx));
+
+ if (conf) {
+ curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
+
+ drv_unassign_vif_chanctx(local, sdata, curr_ctx);
+ conf = NULL;
+ list_del(&sdata->assigned_chanctx_list);
+ }
+
+ if (new_ctx) {
+ ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
+ if (ret)
+ goto out;
+
+ conf = &new_ctx->conf;
+ list_add(&sdata->assigned_chanctx_list,
+ &new_ctx->assigned_vifs);
+ }
+
+out:
+ rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
+
+ sdata->vif.bss_conf.idle = !conf;
+
+ if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
+ ieee80211_recalc_chanctx_chantype(local, curr_ctx);
+ ieee80211_recalc_smps_chanctx(local, curr_ctx);
+ ieee80211_recalc_radar_chanctx(local, curr_ctx);
+ ieee80211_recalc_chanctx_min_def(local, curr_ctx);
+ }
+
+ if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
+ ieee80211_recalc_txpower(sdata, false);
+ ieee80211_recalc_chanctx_min_def(local, new_ctx);
+ }
+
+ if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
+ sdata->vif.type != NL80211_IFTYPE_MONITOR)
+ ieee80211_bss_info_change_notify(sdata,
+ BSS_CHANGED_IDLE);
+
+ ieee80211_check_fast_xmit_iface(sdata);
+
+ return ret;
+}
+
+void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
+ struct ieee80211_chanctx *chanctx)
+{
+ struct ieee80211_sub_if_data *sdata;
+ u8 rx_chains_static, rx_chains_dynamic;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ rx_chains_static = 1;
+ rx_chains_dynamic = 1;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ u8 needed_static, needed_dynamic;
+
+ if (!ieee80211_sdata_running(sdata))
+ continue;
+
+ if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
+ &chanctx->conf)
+ continue;
+
+ switch (sdata->vif.type) {
+ case NL80211_IFTYPE_P2P_DEVICE:
+ case NL80211_IFTYPE_NAN:
+ continue;
+ case NL80211_IFTYPE_STATION:
+ if (!sdata->u.mgd.associated)
+ continue;
+ break;
+ case NL80211_IFTYPE_AP_VLAN:
+ continue;
+ case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_ADHOC:
+ case NL80211_IFTYPE_WDS:
+ case NL80211_IFTYPE_MESH_POINT:
+ case NL80211_IFTYPE_OCB:
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ }
+
+ switch (sdata->smps_mode) {
+ default:
+ WARN_ONCE(1, "Invalid SMPS mode %d\n",
+ sdata->smps_mode);
+ /* fall through */
+ case IEEE80211_SMPS_OFF:
+ needed_static = sdata->needed_rx_chains;
+ needed_dynamic = sdata->needed_rx_chains;
+ break;
+ case IEEE80211_SMPS_DYNAMIC:
+ needed_static = 1;
+ needed_dynamic = sdata->needed_rx_chains;
+ break;
+ case IEEE80211_SMPS_STATIC:
+ needed_static = 1;
+ needed_dynamic = 1;
+ break;
+ }
+
+ rx_chains_static = max(rx_chains_static, needed_static);
+ rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
+ }
+
+ /* Disable SMPS for the monitor interface */
+ sdata = rcu_dereference(local->monitor_sdata);
+ if (sdata &&
+ rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
+ rx_chains_dynamic = rx_chains_static = local->rx_chains;
+
+ rcu_read_unlock();
+
+ if (!local->use_chanctx) {
+ if (rx_chains_static > 1)
+ local->smps_mode = IEEE80211_SMPS_OFF;
+ else if (rx_chains_dynamic > 1)
+ local->smps_mode = IEEE80211_SMPS_DYNAMIC;
+ else
+ local->smps_mode = IEEE80211_SMPS_STATIC;
+ ieee80211_hw_config(local, 0);
+ }
+
+ if (rx_chains_static == chanctx->conf.rx_chains_static &&
+ rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
+ return;
+
+ chanctx->conf.rx_chains_static = rx_chains_static;
+ chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
+ drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
+}
+
+static void
+__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
+ bool clear)
+{
+ struct ieee80211_local *local __maybe_unused = sdata->local;
+ struct ieee80211_sub_if_data *vlan;
+ struct ieee80211_chanctx_conf *conf;
+
+ if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
+ return;
+
+ lockdep_assert_held(&local->mtx);
+
+ /* Check that conf exists, even when clearing this function
+ * must be called with the AP's channel context still there
+ * as it would otherwise cause VLANs to have an invalid
+ * channel context pointer for a while, possibly pointing
+ * to a channel context that has already been freed.
+ */
+ conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
+ lockdep_is_held(&local->chanctx_mtx));
+ WARN_ON(!conf);
+
+ if (clear)
+ conf = NULL;
+
+ list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
+ rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
+}
+
+void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
+ bool clear)
+{
+ struct ieee80211_local *local = sdata->local;
+
+ mutex_lock(&local->chanctx_mtx);
+
+ __ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
+
+ mutex_unlock(&local->chanctx_mtx);
+}
+
+int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
+
+ lockdep_assert_held(&sdata->local->chanctx_mtx);
+
+ if (WARN_ON(!ctx))
+ return -EINVAL;
+
+ list_del(&sdata->reserved_chanctx_list);
+ sdata->reserved_chanctx = NULL;
+
+ if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
+ if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
+ if (WARN_ON(!ctx->replace_ctx))
+ return -EINVAL;
+
+ WARN_ON(ctx->replace_ctx->replace_state !=
+ IEEE80211_CHANCTX_WILL_BE_REPLACED);
+ WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
+
+ ctx->replace_ctx->replace_ctx = NULL;
+ ctx->replace_ctx->replace_state =
+ IEEE80211_CHANCTX_REPLACE_NONE;
+
+ list_del_rcu(&ctx->list);
+ kfree_rcu(ctx, rcu_head);
+ } else {
+ ieee80211_free_chanctx(sdata->local, ctx);
+ }
+ }
+
+ return 0;
+}
+
+int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
+ const struct cfg80211_chan_def *chandef,
+ enum ieee80211_chanctx_mode mode,
+ bool radar_required)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ curr_ctx = ieee80211_vif_get_chanctx(sdata);
+ if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
+ return -ENOTSUPP;
+
+ new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
+ if (!new_ctx) {
+ if (ieee80211_can_create_new_chanctx(local)) {
+ new_ctx = ieee80211_new_chanctx(local, chandef, mode);
+ if (IS_ERR(new_ctx))
+ return PTR_ERR(new_ctx);
+ } else {
+ if (!curr_ctx ||
+ (curr_ctx->replace_state ==
+ IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
+ !list_empty(&curr_ctx->reserved_vifs)) {
+ /*
+ * Another vif already requested this context
+ * for a reservation. Find another one hoping
+ * all vifs assigned to it will also switch
+ * soon enough.
+ *
+ * TODO: This needs a little more work as some
+ * cases (more than 2 chanctx capable devices)
+ * may fail which could otherwise succeed
+ * provided some channel context juggling was
+ * performed.
+ *
+ * Consider ctx1..3, vif1..6, each ctx has 2
+ * vifs. vif1 and vif2 from ctx1 request new
+ * different chandefs starting 2 in-place
+ * reserations with ctx4 and ctx5 replacing
+ * ctx1 and ctx2 respectively. Next vif5 and
+ * vif6 from ctx3 reserve ctx4. If vif3 and
+ * vif4 remain on ctx2 as they are then this
+ * fails unless `replace_ctx` from ctx5 is
+ * replaced with ctx3.
+ */
+ list_for_each_entry(ctx, &local->chanctx_list,
+ list) {
+ if (ctx->replace_state !=
+ IEEE80211_CHANCTX_REPLACE_NONE)
+ continue;
+
+ if (!list_empty(&ctx->reserved_vifs))
+ continue;
+
+ curr_ctx = ctx;
+ break;
+ }
+ }
+
+ /*
+ * If that's true then all available contexts already
+ * have reservations and cannot be used.
+ */
+ if (!curr_ctx ||
+ (curr_ctx->replace_state ==
+ IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
+ !list_empty(&curr_ctx->reserved_vifs))
+ return -EBUSY;
+
+ new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
+ if (!new_ctx)
+ return -ENOMEM;
+
+ new_ctx->replace_ctx = curr_ctx;
+ new_ctx->replace_state =
+ IEEE80211_CHANCTX_REPLACES_OTHER;
+
+ curr_ctx->replace_ctx = new_ctx;
+ curr_ctx->replace_state =
+ IEEE80211_CHANCTX_WILL_BE_REPLACED;
+
+ list_add_rcu(&new_ctx->list, &local->chanctx_list);
+ }
+ }
+
+ list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
+ sdata->reserved_chanctx = new_ctx;
+ sdata->reserved_chandef = *chandef;
+ sdata->reserved_radar_required = radar_required;
+ sdata->reserved_ready = false;
+
+ 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:
+ case NL80211_IFTYPE_OCB:
+ ieee80211_queue_work(&sdata->local->hw,
+ &sdata->csa_finalize_work);
+ break;
+ 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:
+ case NL80211_IFTYPE_P2P_CLIENT:
+ case NL80211_IFTYPE_P2P_GO:
+ case NL80211_IFTYPE_P2P_DEVICE:
+ case NL80211_IFTYPE_NAN:
+ case NUM_NL80211_IFTYPES:
+ WARN_ON(1);
+ break;
+ }
+}
+
+static void
+ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
+ const struct cfg80211_chan_def *chandef)
+{
+ struct ieee80211_sub_if_data *vlan;
+
+ sdata->vif.bss_conf.chandef = *chandef;
+
+ if (sdata->vif.type != NL80211_IFTYPE_AP)
+ return;
+
+ list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
+ vlan->vif.bss_conf.chandef = *chandef;
+}
+
+static int
+ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
+ struct ieee80211_chanctx *old_ctx, *new_ctx;
+ const struct cfg80211_chan_def *chandef;
+ u32 changed = 0;
+ int err;
+
+ lockdep_assert_held(&local->mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ new_ctx = sdata->reserved_chanctx;
+ old_ctx = ieee80211_vif_get_chanctx(sdata);
+
+ if (WARN_ON(!sdata->reserved_ready))
+ return -EBUSY;
+
+ if (WARN_ON(!new_ctx))
+ return -EINVAL;
+
+ if (WARN_ON(!old_ctx))
+ return -EINVAL;
+
+ if (WARN_ON(new_ctx->replace_state ==
+ IEEE80211_CHANCTX_REPLACES_OTHER))
+ return -EINVAL;
+
+ chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
+ &sdata->reserved_chandef);
+ if (WARN_ON(!chandef))
+ return -EINVAL;
+
+ ieee80211_change_chanctx(local, new_ctx, chandef);
+
+ vif_chsw[0].vif = &sdata->vif;
+ vif_chsw[0].old_ctx = &old_ctx->conf;
+ vif_chsw[0].new_ctx = &new_ctx->conf;
+
+ list_del(&sdata->reserved_chanctx_list);
+ sdata->reserved_chanctx = NULL;
+
+ err = drv_switch_vif_chanctx(local, vif_chsw, 1,
+ CHANCTX_SWMODE_REASSIGN_VIF);
+ if (err) {
+ if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
+ ieee80211_free_chanctx(local, new_ctx);
+
+ goto out;
+ }
+
+ list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
+ rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
+
+ if (sdata->vif.type == NL80211_IFTYPE_AP)
+ __ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
+
+ ieee80211_check_fast_xmit_iface(sdata);
+
+ if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
+ ieee80211_free_chanctx(local, old_ctx);
+
+ if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
+ changed = BSS_CHANGED_BANDWIDTH;
+
+ ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
+
+ ieee80211_recalc_smps_chanctx(local, new_ctx);
+ ieee80211_recalc_radar_chanctx(local, new_ctx);
+ ieee80211_recalc_chanctx_min_def(local, new_ctx);
+
+ if (changed)
+ ieee80211_bss_info_change_notify(sdata, changed);
+
+out:
+ ieee80211_vif_chanctx_reservation_complete(sdata);
+ return err;
+}
+
+static int
+ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx *old_ctx, *new_ctx;
+ const struct cfg80211_chan_def *chandef;
+ int err;
+
+ old_ctx = ieee80211_vif_get_chanctx(sdata);
+ new_ctx = sdata->reserved_chanctx;
+
+ if (WARN_ON(!sdata->reserved_ready))
+ return -EINVAL;
+
+ if (WARN_ON(old_ctx))
+ return -EINVAL;
+
+ if (WARN_ON(!new_ctx))
+ return -EINVAL;
+
+ if (WARN_ON(new_ctx->replace_state ==
+ IEEE80211_CHANCTX_REPLACES_OTHER))
+ return -EINVAL;
+
+ chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
+ &sdata->reserved_chandef);
+ if (WARN_ON(!chandef))
+ return -EINVAL;
+
+ ieee80211_change_chanctx(local, new_ctx, chandef);
+
+ list_del(&sdata->reserved_chanctx_list);
+ sdata->reserved_chanctx = NULL;
+
+ err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
+ if (err) {
+ if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
+ ieee80211_free_chanctx(local, new_ctx);
+
+ goto out;
+ }
+
+out:
+ ieee80211_vif_chanctx_reservation_complete(sdata);
+ return err;
+}
+
+static bool
+ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_chanctx *old_ctx, *new_ctx;
+
+ lockdep_assert_held(&sdata->local->chanctx_mtx);
+
+ new_ctx = sdata->reserved_chanctx;
+ old_ctx = ieee80211_vif_get_chanctx(sdata);
+
+ if (!old_ctx)
+ return false;
+
+ if (WARN_ON(!new_ctx))
+ return false;
+
+ if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
+ return false;
+
+ if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
+ return false;
+
+ return true;
+}
+
+static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
+ struct ieee80211_chanctx *new_ctx)
+{
+ const struct cfg80211_chan_def *chandef;
+
+ lockdep_assert_held(&local->mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
+ if (WARN_ON(!chandef))
+ return -EINVAL;
+
+ local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
+ local->_oper_chandef = *chandef;
+ ieee80211_hw_config(local, 0);
+
+ return 0;
+}
+
+static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
+ int n_vifs)
+{
+ struct ieee80211_vif_chanctx_switch *vif_chsw;
+ struct ieee80211_sub_if_data *sdata;
+ struct ieee80211_chanctx *ctx, *old_ctx;
+ int i, err;
+
+ lockdep_assert_held(&local->mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
+ if (!vif_chsw)
+ return -ENOMEM;
+
+ i = 0;
+ list_for_each_entry(ctx, &local->chanctx_list, list) {
+ if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
+ continue;
+
+ if (WARN_ON(!ctx->replace_ctx)) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ list_for_each_entry(sdata, &ctx->reserved_vifs,
+ reserved_chanctx_list) {
+ if (!ieee80211_vif_has_in_place_reservation(
+ sdata))
+ continue;
+
+ old_ctx = ieee80211_vif_get_chanctx(sdata);
+ vif_chsw[i].vif = &sdata->vif;
+ vif_chsw[i].old_ctx = &old_ctx->conf;
+ vif_chsw[i].new_ctx = &ctx->conf;
+
+ i++;
+ }
+ }
+
+ err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
+ CHANCTX_SWMODE_SWAP_CONTEXTS);
+
+out:
+ kfree(vif_chsw);
+ return err;
+}
+
+static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
+{
+ struct ieee80211_chanctx *ctx;
+ int err;
+
+ lockdep_assert_held(&local->mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ list_for_each_entry(ctx, &local->chanctx_list, list) {
+ if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
+ continue;
+
+ if (!list_empty(&ctx->replace_ctx->assigned_vifs))
+ continue;
+
+ ieee80211_del_chanctx(local, ctx->replace_ctx);
+ err = ieee80211_add_chanctx(local, ctx);
+ if (err)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ WARN_ON(ieee80211_add_chanctx(local, ctx));
+ list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
+ if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
+ continue;
+
+ if (!list_empty(&ctx->replace_ctx->assigned_vifs))
+ continue;
+
+ ieee80211_del_chanctx(local, ctx);
+ WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
+ }
+
+ return err;
+}
+
+static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
+{
+ struct ieee80211_sub_if_data *sdata, *sdata_tmp;
+ struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
+ struct ieee80211_chanctx *new_ctx = NULL;
+ int err, n_assigned, n_reserved, n_ready;
+ int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
+
+ lockdep_assert_held(&local->mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ /*
+ * If there are 2 independent pairs of channel contexts performing
+ * cross-switch of their vifs this code will still wait until both are
+ * ready even though it could be possible to switch one before the
+ * other is ready.
+ *
+ * For practical reasons and code simplicity just do a single huge
+ * switch.
+ */
+
+ /*
+ * Verify if the reservation is still feasible.
+ * - if it's not then disconnect
+ * - if it is but not all vifs necessary are ready then defer
+ */
+
+ list_for_each_entry(ctx, &local->chanctx_list, list) {
+ if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
+ continue;
+
+ if (WARN_ON(!ctx->replace_ctx)) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ if (!local->use_chanctx)
+ new_ctx = ctx;
+
+ n_ctx++;
+
+ n_assigned = 0;
+ n_reserved = 0;
+ n_ready = 0;
+
+ list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
+ assigned_chanctx_list) {
+ n_assigned++;
+ if (sdata->reserved_chanctx) {
+ n_reserved++;
+ if (sdata->reserved_ready)
+ n_ready++;
+ }
+ }
+
+ if (n_assigned != n_reserved) {
+ if (n_ready == n_reserved) {
+ wiphy_info(local->hw.wiphy,
+ "channel context reservation cannot be finalized because some interfaces aren't switching\n");
+ err = -EBUSY;
+ goto err;
+ }
+
+ return -EAGAIN;
+ }
+
+ ctx->conf.radar_enabled = false;
+ list_for_each_entry(sdata, &ctx->reserved_vifs,
+ reserved_chanctx_list) {
+ if (ieee80211_vif_has_in_place_reservation(sdata) &&
+ !sdata->reserved_ready)
+ return -EAGAIN;
+
+ old_ctx = ieee80211_vif_get_chanctx(sdata);
+ if (old_ctx) {
+ if (old_ctx->replace_state ==
+ IEEE80211_CHANCTX_WILL_BE_REPLACED)
+ n_vifs_switch++;
+ else
+ n_vifs_assign++;
+ } else {
+ n_vifs_ctxless++;
+ }
+
+ if (sdata->reserved_radar_required)
+ ctx->conf.radar_enabled = true;
+ }
+ }
+
+ if (WARN_ON(n_ctx == 0) ||
+ WARN_ON(n_vifs_switch == 0 &&
+ n_vifs_assign == 0 &&
+ n_vifs_ctxless == 0) ||
+ WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
+ WARN_ON(!new_ctx && !local->use_chanctx)) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ /*
+ * All necessary vifs are ready. Perform the switch now depending on
+ * reservations and driver capabilities.
+ */
+
+ if (local->use_chanctx) {
+ if (n_vifs_switch > 0) {
+ err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
+ if (err)
+ goto err;
+ }
+
+ if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
+ err = ieee80211_chsw_switch_ctxs(local);
+ if (err)
+ goto err;
+ }
+ } else {
+ err = ieee80211_chsw_switch_hwconf(local, new_ctx);
+ if (err)
+ goto err;
+ }
+
+ /*
+ * Update all structures, values and pointers to point to new channel
+ * context(s).
+ */
+ list_for_each_entry(ctx, &local->chanctx_list, list) {
+ if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
+ continue;
+
+ if (WARN_ON(!ctx->replace_ctx)) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ list_for_each_entry(sdata, &ctx->reserved_vifs,
+ reserved_chanctx_list) {
+ u32 changed = 0;
+
+ if (!ieee80211_vif_has_in_place_reservation(sdata))
+ continue;
+
+ rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
+
+ if (sdata->vif.type == NL80211_IFTYPE_AP)
+ __ieee80211_vif_copy_chanctx_to_vlans(sdata,
+ false);
+
+ ieee80211_check_fast_xmit_iface(sdata);
+
+ sdata->radar_required = sdata->reserved_radar_required;
+
+ if (sdata->vif.bss_conf.chandef.width !=
+ sdata->reserved_chandef.width)
+ changed = BSS_CHANGED_BANDWIDTH;
+
+ ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
+ if (changed)
+ ieee80211_bss_info_change_notify(sdata,
+ changed);
+
+ ieee80211_recalc_txpower(sdata, false);
+ }
+
+ 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);
+
+ list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
+ reserved_chanctx_list) {
+ if (ieee80211_vif_get_chanctx(sdata) != ctx)
+ continue;
+
+ list_del(&sdata->reserved_chanctx_list);
+ list_move(&sdata->assigned_chanctx_list,
+ &ctx->assigned_vifs);
+ sdata->reserved_chanctx = NULL;
+
+ ieee80211_vif_chanctx_reservation_complete(sdata);
+ }
+
+ /*
+ * This context might have been a dependency for an already
+ * ready re-assign reservation interface that was deferred. Do
+ * not propagate error to the caller though. The in-place
+ * reservation for originally requested interface has already
+ * succeeded at this point.
+ */
+ list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
+ reserved_chanctx_list) {
+ if (WARN_ON(ieee80211_vif_has_in_place_reservation(
+ sdata)))
+ continue;
+
+ if (WARN_ON(sdata->reserved_chanctx != ctx))
+ continue;
+
+ if (!sdata->reserved_ready)
+ continue;
+
+ if (ieee80211_vif_get_chanctx(sdata))
+ err = ieee80211_vif_use_reserved_reassign(
+ sdata);
+ else
+ err = ieee80211_vif_use_reserved_assign(sdata);
+
+ if (err) {
+ sdata_info(sdata,
+ "failed to finalize (re-)assign reservation (err=%d)\n",
+ err);
+ ieee80211_vif_unreserve_chanctx(sdata);
+ cfg80211_stop_iface(local->hw.wiphy,
+ &sdata->wdev,
+ GFP_KERNEL);
+ }
+ }
+ }
+
+ /*
+ * Finally free old contexts
+ */
+
+ list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
+ if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
+ continue;
+
+ ctx->replace_ctx->replace_ctx = NULL;
+ ctx->replace_ctx->replace_state =
+ IEEE80211_CHANCTX_REPLACE_NONE;
+
+ list_del_rcu(&ctx->list);
+ kfree_rcu(ctx, rcu_head);
+ }
+
+ return 0;
+
+err:
+ list_for_each_entry(ctx, &local->chanctx_list, list) {
+ if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
+ continue;
+
+ list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
+ reserved_chanctx_list) {
+ ieee80211_vif_unreserve_chanctx(sdata);
+ ieee80211_vif_chanctx_reservation_complete(sdata);
+ }
+ }
+
+ return err;
+}
+
+static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx_conf *conf;
+ struct ieee80211_chanctx *ctx;
+ bool use_reserved_switch = false;
+
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
+ lockdep_is_held(&local->chanctx_mtx));
+ if (!conf)
+ return;
+
+ ctx = container_of(conf, struct ieee80211_chanctx, conf);
+
+ if (sdata->reserved_chanctx) {
+ if (sdata->reserved_chanctx->replace_state ==
+ IEEE80211_CHANCTX_REPLACES_OTHER &&
+ ieee80211_chanctx_num_reserved(local,
+ sdata->reserved_chanctx) > 1)
+ use_reserved_switch = true;
+
+ ieee80211_vif_unreserve_chanctx(sdata);
+ }
+
+ ieee80211_assign_vif_chanctx(sdata, NULL);
+ if (ieee80211_chanctx_refcount(local, ctx) == 0)
+ ieee80211_free_chanctx(local, ctx);
+
+ sdata->radar_required = false;
+
+ /* Unreserving may ready an in-place reservation. */
+ if (use_reserved_switch)
+ ieee80211_vif_use_reserved_switch(local);
+}
+
+int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
+ const struct cfg80211_chan_def *chandef,
+ enum ieee80211_chanctx_mode mode)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx *ctx;
+ u8 radar_detect_width = 0;
+ int ret;
+
+ lockdep_assert_held(&local->mtx);
+
+ WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
+
+ mutex_lock(&local->chanctx_mtx);
+
+ ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
+ chandef,
+ sdata->wdev.iftype);
+ if (ret < 0)
+ goto out;
+ if (ret > 0)
+ radar_detect_width = BIT(chandef->width);
+
+ sdata->radar_required = ret;
+
+ ret = ieee80211_check_combinations(sdata, chandef, mode,
+ radar_detect_width);
+ if (ret < 0)
+ goto out;
+
+ __ieee80211_vif_release_channel(sdata);
+
+ ctx = ieee80211_find_chanctx(local, chandef, mode);
+ if (!ctx)
+ ctx = ieee80211_new_chanctx(local, chandef, mode);
+ if (IS_ERR(ctx)) {
+ ret = PTR_ERR(ctx);
+ goto out;
+ }
+
+ ieee80211_vif_update_chandef(sdata, chandef);
+
+ ret = ieee80211_assign_vif_chanctx(sdata, ctx);
+ if (ret) {
+ /* if assign fails refcount stays the same */
+ if (ieee80211_chanctx_refcount(local, ctx) == 0)
+ ieee80211_free_chanctx(local, ctx);
+ goto out;
+ }
+
+ ieee80211_recalc_smps_chanctx(local, ctx);
+ ieee80211_recalc_radar_chanctx(local, ctx);
+ out:
+ if (ret)
+ sdata->radar_required = false;
+
+ mutex_unlock(&local->chanctx_mtx);
+ return ret;
+}
+
+int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx *new_ctx;
+ struct ieee80211_chanctx *old_ctx;
+ int err;
+
+ lockdep_assert_held(&local->mtx);
+ lockdep_assert_held(&local->chanctx_mtx);
+
+ new_ctx = sdata->reserved_chanctx;
+ old_ctx = ieee80211_vif_get_chanctx(sdata);
+
+ if (WARN_ON(!new_ctx))
+ return -EINVAL;
+
+ if (WARN_ON(new_ctx->replace_state ==
+ IEEE80211_CHANCTX_WILL_BE_REPLACED))
+ return -EINVAL;
+
+ if (WARN_ON(sdata->reserved_ready))
+ return -EINVAL;
+
+ sdata->reserved_ready = true;
+
+ if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
+ if (old_ctx)
+ err = ieee80211_vif_use_reserved_reassign(sdata);
+ else
+ err = ieee80211_vif_use_reserved_assign(sdata);
+
+ if (err)
+ return err;
+ }
+
+ /*
+ * In-place reservation may need to be finalized now either if:
+ * a) sdata is taking part in the swapping itself and is the last one
+ * b) sdata has switched with a re-assign reservation to an existing
+ * context readying in-place switching of old_ctx
+ *
+ * In case of (b) do not propagate the error up because the requested
+ * sdata already switched successfully. Just spill an extra warning.
+ * The ieee80211_vif_use_reserved_switch() already stops all necessary
+ * interfaces upon failure.
+ */
+ if ((old_ctx &&
+ old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
+ new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
+ err = ieee80211_vif_use_reserved_switch(local);
+ if (err && err != -EAGAIN) {
+ if (new_ctx->replace_state ==
+ IEEE80211_CHANCTX_REPLACES_OTHER)
+ return err;
+
+ wiphy_info(local->hw.wiphy,
+ "depending in-place reservation failed (err=%d)\n",
+ err);
+ }
+ }
+
+ return 0;
+}
+
+int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
+ const struct cfg80211_chan_def *chandef,
+ u32 *changed)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_chanctx_conf *conf;
+ struct ieee80211_chanctx *ctx;
+ const struct cfg80211_chan_def *compat;
+ int ret;
+
+ if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
+ IEEE80211_CHAN_DISABLED))
+ return -EINVAL;
+
+ mutex_lock(&local->chanctx_mtx);
+ if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
+ ret = 0;
+ goto out;
+ }
+
+ if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
+ sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ 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);
+
+ compat = cfg80211_chandef_compatible(&conf->def, chandef);
+ if (!compat) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ switch (ctx->replace_state) {
+ case IEEE80211_CHANCTX_REPLACE_NONE:
+ if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ break;
+ case IEEE80211_CHANCTX_WILL_BE_REPLACED:
+ /* TODO: Perhaps the bandwidth change could be treated as a
+ * reservation itself? */
+ ret = -EBUSY;
+ goto out;
+ case IEEE80211_CHANCTX_REPLACES_OTHER:
+ /* channel context that is going to replace another channel
+ * context doesn't really exist and shouldn't be assigned
+ * anywhere yet */
+ WARN_ON(1);
+ break;
+ }
+
+ ieee80211_vif_update_chandef(sdata, chandef);
+
+ ieee80211_recalc_chanctx_chantype(local, ctx);
+
+ *changed |= BSS_CHANGED_BANDWIDTH;
+ ret = 0;
+ out:
+ mutex_unlock(&local->chanctx_mtx);
+ return ret;
+}
+
+void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
+{
+ WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
+
+ lockdep_assert_held(&sdata->local->mtx);
+
+ mutex_lock(&sdata->local->chanctx_mtx);
+ __ieee80211_vif_release_channel(sdata);
+ mutex_unlock(&sdata->local->chanctx_mtx);
+}
+
+void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_sub_if_data *ap;
+ struct ieee80211_chanctx_conf *conf;
+
+ if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
+ return;
+
+ ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
+
+ mutex_lock(&local->chanctx_mtx);
+
+ conf = rcu_dereference_protected(ap->vif.chanctx_conf,
+ lockdep_is_held(&local->chanctx_mtx));
+ rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
+ mutex_unlock(&local->chanctx_mtx);
+}
+
+void ieee80211_iter_chan_contexts_atomic(
+ struct ieee80211_hw *hw,
+ void (*iter)(struct ieee80211_hw *hw,
+ struct ieee80211_chanctx_conf *chanctx_conf,
+ void *data),
+ void *iter_data)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_chanctx *ctx;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
+ if (ctx->driver_present)
+ iter(hw, &ctx->conf, iter_data);
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);