| /* |
| * 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; |
| } |
| |
| static 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; |
| |
| if (!sta->uploaded) |
| 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_P2P_DEVICE: |
| continue; |
| case NL80211_IFTYPE_STATION: |
| 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)) |
| 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; |
| } |
| |
| static 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 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 = ieee80211_is_radar_required(local); |
| 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); |
| } |
| |
| static 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; |
| |
| 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; |
| } |
| 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 setting local->radar_detect_enabled */ |
| lockdep_assert_held(&local->mtx); |
| |
| radar_enabled = ieee80211_is_radar_required(local); |
| |
| if (radar_enabled == chanctx->conf.radar_enabled) |
| return; |
| |
| chanctx->conf.radar_enabled = radar_enabled; |
| local->radar_detect_enabled = chanctx->conf.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; |
| |
| 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); |
| 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); |
| |
| 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: |
| 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 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; |
| |
| 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); |
| |
| 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); |
| |
| 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; |
| |
| 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 = kzalloc(sizeof(vif_chsw[0]) * n_vifs, 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 i, 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). |
| */ |
| |
| 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 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); |
| |
| 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); |
| } |
| |
| 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); |
| |
| /* 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: |
| 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); |