diff options
Diffstat (limited to 'net/mac80211/chan.c')
| -rw-r--r-- | net/mac80211/chan.c | 826 |
1 files changed, 681 insertions, 145 deletions
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c index 3a4764b2869..a310e33972d 100644 --- a/net/mac80211/chan.c +++ b/net/mac80211/chan.c @@ -9,6 +9,310 @@ #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 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->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: + 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) @@ -20,6 +324,7 @@ static void ieee80211_change_chanctx(struct ieee80211_local *local, 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; @@ -49,6 +354,11 @@ ieee80211_find_chanctx(struct ieee80211_local *local, if (!compat) continue; + compat = ieee80211_chanctx_reserved_chandef(local, ctx, + compat); + if (!compat) + continue; + ieee80211_change_chanctx(local, ctx, compat); return ctx; @@ -61,6 +371,8 @@ 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) { @@ -74,66 +386,91 @@ static bool ieee80211_is_radar_required(struct ieee80211_local *local) } static struct ieee80211_chanctx * -ieee80211_new_chanctx(struct ieee80211_local *local, - const struct cfg80211_chan_def *chandef, - enum ieee80211_chanctx_mode mode) +ieee80211_alloc_chanctx(struct ieee80211_local *local, + const struct cfg80211_chan_def *chandef, + enum ieee80211_chanctx_mode mode) { struct ieee80211_chanctx *ctx; - u32 changed; - int err; lockdep_assert_held(&local->chanctx_mtx); ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); if (!ctx) - return ERR_PTR(-ENOMEM); + 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; - /* acquire mutex to prevent idle from changing */ - mutex_lock(&local->mtx); /* 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 = *chandef; - ieee80211_hw_config(local, 0); + local->_oper_chandef = ctx->conf.def; + ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); } else { err = drv_add_chanctx(local, ctx); if (err) { - kfree(ctx); - ctx = ERR_PTR(err); - ieee80211_recalc_idle(local); - goto out; + return err; } } - /* and keep the mutex held until the new chanctx is on the list */ - list_add_rcu(&ctx->list, &local->chanctx_list); + return 0; +} - out: - mutex_unlock(&local->mtx); +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_free_chanctx(struct ieee80211_local *local, - struct ieee80211_chanctx *ctx) +static void ieee80211_del_chanctx(struct ieee80211_local *local, + struct ieee80211_chanctx *ctx) { - bool check_single_channel = false; lockdep_assert_held(&local->chanctx_mtx); - WARN_ON_ONCE(ctx->refcount != 0); - if (!local->use_chanctx) { struct cfg80211_chan_def *chandef = &local->_oper_chandef; chandef->width = NL80211_CHAN_WIDTH_20_NOHT; @@ -143,49 +480,29 @@ static void ieee80211_free_chanctx(struct ieee80211_local *local, /* NOTE: Disabling radar is only valid here for * single channel context. To be sure, check it ... */ - if (local->hw.conf.radar_enabled) - check_single_channel = true; + WARN_ON(local->hw.conf.radar_enabled && + !list_empty(&local->chanctx_list)); + local->hw.conf.radar_enabled = false; - ieee80211_hw_config(local, 0); + ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); } else { drv_remove_chanctx(local, ctx); } - list_del_rcu(&ctx->list); - kfree_rcu(ctx, rcu_head); - - /* throw a warning if this wasn't the only channel context. */ - WARN_ON(check_single_channel && !list_empty(&local->chanctx_list)); - - mutex_lock(&local->mtx); ieee80211_recalc_idle(local); - mutex_unlock(&local->mtx); } -static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, - struct ieee80211_chanctx *ctx) +static void ieee80211_free_chanctx(struct ieee80211_local *local, + struct ieee80211_chanctx *ctx) { - struct ieee80211_local *local = sdata->local; - int ret; - lockdep_assert_held(&local->chanctx_mtx); - ret = drv_assign_vif_chanctx(local, sdata, ctx); - if (ret) - return ret; - - rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf); - ctx->refcount++; - - ieee80211_recalc_txpower(sdata); - sdata->vif.bss_conf.idle = false; - - if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && - sdata->vif.type != NL80211_IFTYPE_MONITOR) - ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE); + WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0); - return 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, @@ -221,72 +538,106 @@ static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, ieee80211_change_chanctx(local, ctx, compat); } -static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata, - struct ieee80211_chanctx *ctx) +static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, + struct ieee80211_chanctx *chanctx) { - struct ieee80211_local *local = sdata->local; + bool radar_enabled; lockdep_assert_held(&local->chanctx_mtx); + /* for setting local->radar_detect_enabled */ + lockdep_assert_held(&local->mtx); - ctx->refcount--; - rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); - - sdata->vif.bss_conf.idle = true; + radar_enabled = ieee80211_is_radar_required(local); - if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && - sdata->vif.type != NL80211_IFTYPE_MONITOR) - ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE); + if (radar_enabled == chanctx->conf.radar_enabled) + return; - drv_unassign_vif_chanctx(local, sdata, ctx); + chanctx->conf.radar_enabled = radar_enabled; + local->radar_detect_enabled = chanctx->conf.radar_enabled; - if (ctx->refcount > 0) { - ieee80211_recalc_chanctx_chantype(sdata->local, ctx); - ieee80211_recalc_smps_chanctx(local, ctx); - ieee80211_recalc_radar_chanctx(local, ctx); + 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 void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) +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 *ctx; - - lockdep_assert_held(&local->chanctx_mtx); + 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) - return; - ctx = container_of(conf, struct ieee80211_chanctx, conf); + if (conf) { + curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); - ieee80211_unassign_vif_chanctx(sdata, ctx); - if (ctx->refcount == 0) - ieee80211_free_chanctx(local, ctx); + 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_radar_chanctx(struct ieee80211_local *local, - struct ieee80211_chanctx *chanctx) +static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) { - bool radar_enabled; + struct ieee80211_local *local = sdata->local; + struct ieee80211_chanctx_conf *conf; + struct ieee80211_chanctx *ctx; lockdep_assert_held(&local->chanctx_mtx); - radar_enabled = ieee80211_is_radar_required(local); - - if (radar_enabled == chanctx->conf.radar_enabled) + conf = rcu_dereference_protected(sdata->vif.chanctx_conf, + lockdep_is_held(&local->chanctx_mtx)); + if (!conf) return; - chanctx->conf.radar_enabled = radar_enabled; - local->radar_detect_enabled = chanctx->conf.radar_enabled; + ctx = container_of(conf, struct ieee80211_chanctx, conf); - if (!local->use_chanctx) { - local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; - ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); - } + if (sdata->reserved_chanctx) + ieee80211_vif_unreserve_chanctx(sdata); - drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); + ieee80211_assign_vif_chanctx(sdata, NULL); + if (ieee80211_chanctx_refcount(local, ctx) == 0) + ieee80211_free_chanctx(local, ctx); } void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, @@ -351,6 +702,13 @@ void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, 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) { @@ -378,11 +736,30 @@ int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, { 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); @@ -398,7 +775,7 @@ int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, ret = ieee80211_assign_vif_chanctx(sdata, ctx); if (ret) { /* if assign fails refcount stays the same */ - if (ctx->refcount == 0) + if (ieee80211_chanctx_refcount(local, ctx) == 0) ieee80211_free_chanctx(local, ctx); goto out; } @@ -410,25 +787,142 @@ int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, return ret; } +static int __ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata, + struct ieee80211_chanctx *ctx, + u32 *changed) +{ + struct ieee80211_local *local = sdata->local; + const struct cfg80211_chan_def *chandef = &sdata->csa_chandef; + u32 chanctx_changed = 0; + + if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, + IEEE80211_CHAN_DISABLED)) + return -EINVAL; + + if (ieee80211_chanctx_refcount(local, ctx) != 1) + return -EINVAL; + + if (sdata->vif.bss_conf.chandef.width != chandef->width) { + chanctx_changed = IEEE80211_CHANCTX_CHANGE_WIDTH; + *changed |= BSS_CHANGED_BANDWIDTH; + } + + sdata->vif.bss_conf.chandef = *chandef; + ctx->conf.def = *chandef; + + chanctx_changed |= IEEE80211_CHANCTX_CHANGE_CHANNEL; + drv_change_chanctx(local, ctx, chanctx_changed); + + ieee80211_recalc_chanctx_chantype(local, ctx); + ieee80211_recalc_smps_chanctx(local, ctx); + ieee80211_recalc_radar_chanctx(local, ctx); + ieee80211_recalc_chanctx_min_def(local, ctx); + + return 0; +} + int ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata, - const struct cfg80211_chan_def *chandef, u32 *changed) { struct ieee80211_local *local = sdata->local; struct ieee80211_chanctx_conf *conf; struct ieee80211_chanctx *ctx; int ret; - u32 chanctx_changed = 0; + + lockdep_assert_held(&local->mtx); /* should never be called if not performing a channel switch. */ if (WARN_ON(!sdata->vif.csa_active)) return -EINVAL; - if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, - IEEE80211_CHAN_DISABLED)) + mutex_lock(&local->chanctx_mtx); + conf = rcu_dereference_protected(sdata->vif.chanctx_conf, + lockdep_is_held(&local->chanctx_mtx)); + if (!conf) { + ret = -EINVAL; + goto out; + } + + ctx = container_of(conf, struct ieee80211_chanctx, conf); + + ret = __ieee80211_vif_change_channel(sdata, ctx, changed); + out: + mutex_unlock(&local->chanctx_mtx); + return ret; +} + +static void +__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, + bool clear) +{ + 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) + 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_conf *conf; + struct ieee80211_chanctx *new_ctx, *curr_ctx; + int ret = 0; + mutex_lock(&local->chanctx_mtx); + conf = rcu_dereference_protected(sdata->vif.chanctx_conf, lockdep_is_held(&local->chanctx_mtx)); if (!conf) { @@ -436,34 +930,108 @@ int ieee80211_vif_change_channel(struct ieee80211_sub_if_data *sdata, goto out; } - ctx = container_of(conf, struct ieee80211_chanctx, conf); - if (ctx->refcount != 1) { + curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); + + new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode); + if (!new_ctx) { + if (ieee80211_chanctx_refcount(local, curr_ctx) == 1 && + (local->hw.flags & IEEE80211_HW_CHANGE_RUNNING_CHANCTX)) { + /* if we're the only users of the chanctx and + * the driver supports changing a running + * context, reserve our current context + */ + new_ctx = curr_ctx; + } else if (ieee80211_can_create_new_chanctx(local)) { + /* create a new context and reserve it */ + new_ctx = ieee80211_new_chanctx(local, chandef, mode); + if (IS_ERR(new_ctx)) { + ret = PTR_ERR(new_ctx); + goto out; + } + } else { + ret = -EBUSY; + goto out; + } + } + + 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; +out: + mutex_unlock(&local->chanctx_mtx); + return ret; +} + +int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata, + u32 *changed) +{ + struct ieee80211_local *local = sdata->local; + struct ieee80211_chanctx *ctx; + struct ieee80211_chanctx *old_ctx; + struct ieee80211_chanctx_conf *conf; + int ret; + u32 tmp_changed = *changed; + + /* TODO: need to recheck if the chandef is usable etc.? */ + + lockdep_assert_held(&local->mtx); + + mutex_lock(&local->chanctx_mtx); + + ctx = sdata->reserved_chanctx; + if (WARN_ON(!ctx)) { ret = -EINVAL; goto out; } - if (sdata->vif.bss_conf.chandef.width != chandef->width) { - chanctx_changed = IEEE80211_CHANCTX_CHANGE_WIDTH; - *changed |= BSS_CHANGED_BANDWIDTH; + conf = rcu_dereference_protected(sdata->vif.chanctx_conf, + lockdep_is_held(&local->chanctx_mtx)); + if (!conf) { + ret = -EINVAL; + goto out; } - sdata->vif.bss_conf.chandef = *chandef; - ctx->conf.def = *chandef; + old_ctx = container_of(conf, struct ieee80211_chanctx, conf); - chanctx_changed |= IEEE80211_CHANCTX_CHANGE_CHANNEL; - drv_change_chanctx(local, ctx, chanctx_changed); + if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width) + tmp_changed |= BSS_CHANGED_BANDWIDTH; - if (!local->use_chanctx) { - local->_oper_chandef = *chandef; - ieee80211_hw_config(local, 0); + sdata->vif.bss_conf.chandef = sdata->reserved_chandef; + + /* unref our reservation */ + sdata->reserved_chanctx = NULL; + sdata->radar_required = sdata->reserved_radar_required; + list_del(&sdata->reserved_chanctx_list); + + if (old_ctx == ctx) { + /* This is our own context, just change it */ + ret = __ieee80211_vif_change_channel(sdata, old_ctx, + &tmp_changed); + if (ret) + goto out; + } else { + ret = ieee80211_assign_vif_chanctx(sdata, ctx); + if (ieee80211_chanctx_refcount(local, old_ctx) == 0) + ieee80211_free_chanctx(local, old_ctx); + if (ret) { + /* if assign fails refcount stays the same */ + if (ieee80211_chanctx_refcount(local, ctx) == 0) + ieee80211_free_chanctx(local, ctx); + goto out; + } + + if (sdata->vif.type == NL80211_IFTYPE_AP) + __ieee80211_vif_copy_chanctx_to_vlans(sdata, false); } + *changed = tmp_changed; + ieee80211_recalc_chanctx_chantype(local, ctx); ieee80211_recalc_smps_chanctx(local, ctx); ieee80211_recalc_radar_chanctx(local, ctx); - - ret = 0; - out: + ieee80211_recalc_chanctx_min_def(local, ctx); +out: mutex_unlock(&local->chanctx_mtx); return ret; } @@ -521,6 +1089,8 @@ 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); @@ -545,40 +1115,6 @@ void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata) mutex_unlock(&local->chanctx_mtx); } -void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, - bool clear) -{ - struct ieee80211_local *local = sdata->local; - struct ieee80211_sub_if_data *vlan; - struct ieee80211_chanctx_conf *conf; - - ASSERT_RTNL(); - - if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) - return; - - mutex_lock(&local->chanctx_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); - - mutex_unlock(&local->chanctx_mtx); -} - void ieee80211_iter_chan_contexts_atomic( struct ieee80211_hw *hw, void (*iter)(struct ieee80211_hw *hw, |