mac80211: introduce channel context skeleton code
Channel context are the foundation for multi-channel operation. They are are immutable and are re-created (or re-used if other interfaces are bound to a certain channel and a compatible channel type) on channel switching. This is an initial implementation and more features will come in separate patches. Signed-off-by: Michal Kazior <michal.kazior@tieto.com> [some changes including RCU protection] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michal Kazior
Johannes Berg
parent
ddffeb8c4d
commit
d01a1e6586
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@ -143,6 +143,32 @@ struct ieee80211_low_level_stats {
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unsigned int dot11RTSSuccessCount;
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};
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/**
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* enum ieee80211_chanctx_change - change flag for channel context
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* @IEEE80211_CHANCTX_CHANGE_CHANNEL_TYPE: The channel type was changed
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*/
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enum ieee80211_chanctx_change {
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IEEE80211_CHANCTX_CHANGE_CHANNEL_TYPE = BIT(0),
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};
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/**
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* struct ieee80211_chanctx_conf - channel context that vifs may be tuned to
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*
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* This is the driver-visible part. The ieee80211_chanctx
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* that contains it is visible in mac80211 only.
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*
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* @channel: the channel to tune to
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* @channel_type: the channel (HT) type
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* @drv_priv: data area for driver use, will always be aligned to
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* sizeof(void *), size is determined in hw information.
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*/
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struct ieee80211_chanctx_conf {
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struct ieee80211_channel *channel;
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enum nl80211_channel_type channel_type;
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u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
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};
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/**
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* enum ieee80211_bss_change - BSS change notification flags
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*
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@ -931,6 +957,11 @@ enum ieee80211_vif_flags {
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* at runtime, mac80211 will never touch this field
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* @hw_queue: hardware queue for each AC
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* @cab_queue: content-after-beacon (DTIM beacon really) queue, AP mode only
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* @chanctx_conf: The channel context this interface is assigned to, or %NULL
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* when it is not assigned. This pointer is RCU-protected due to the TX
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* path needing to access it; even though the netdev carrier will always
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* be off when it is %NULL there can still be races and packets could be
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* processed after it switches back to %NULL.
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* @drv_priv: data area for driver use, will always be aligned to
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* sizeof(void *).
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*/
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@ -943,6 +974,8 @@ struct ieee80211_vif {
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u8 cab_queue;
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u8 hw_queue[IEEE80211_NUM_ACS];
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struct ieee80211_chanctx_conf __rcu *chanctx_conf;
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u32 driver_flags;
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/* must be last */
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@ -1325,6 +1358,8 @@ enum ieee80211_hw_flags {
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* within &struct ieee80211_vif.
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* @sta_data_size: size (in bytes) of the drv_priv data area
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* within &struct ieee80211_sta.
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* @chanctx_data_size: size (in bytes) of the drv_priv data area
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* within &struct ieee80211_chanctx_conf.
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*
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* @max_rates: maximum number of alternate rate retry stages the hw
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* can handle.
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@ -1369,6 +1404,7 @@ struct ieee80211_hw {
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int channel_change_time;
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int vif_data_size;
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int sta_data_size;
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int chanctx_data_size;
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int napi_weight;
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u16 queues;
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u16 max_listen_interval;
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@ -168,3 +168,150 @@ bool ieee80211_set_channel_type(struct ieee80211_local *local,
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return true;
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}
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static struct ieee80211_chanctx *
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ieee80211_find_chanctx(struct ieee80211_local *local,
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struct ieee80211_channel *channel,
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enum nl80211_channel_type channel_type,
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enum ieee80211_chanctx_mode mode)
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{
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struct ieee80211_chanctx *ctx;
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lockdep_assert_held(&local->chanctx_mtx);
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if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
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return NULL;
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if (WARN_ON(!channel))
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return NULL;
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list_for_each_entry(ctx, &local->chanctx_list, list) {
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if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
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continue;
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if (ctx->conf.channel != channel)
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continue;
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if (ctx->conf.channel_type != channel_type)
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continue;
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return ctx;
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}
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return NULL;
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}
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static struct ieee80211_chanctx *
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ieee80211_new_chanctx(struct ieee80211_local *local,
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struct ieee80211_channel *channel,
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enum nl80211_channel_type channel_type,
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enum ieee80211_chanctx_mode mode)
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{
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struct ieee80211_chanctx *ctx;
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lockdep_assert_held(&local->chanctx_mtx);
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ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
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if (!ctx)
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return ERR_PTR(-ENOMEM);
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ctx->conf.channel = channel;
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ctx->conf.channel_type = channel_type;
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ctx->mode = mode;
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list_add(&ctx->list, &local->chanctx_list);
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return ctx;
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}
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static void ieee80211_free_chanctx(struct ieee80211_local *local,
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struct ieee80211_chanctx *ctx)
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{
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lockdep_assert_held(&local->chanctx_mtx);
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WARN_ON_ONCE(ctx->refcount != 0);
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list_del(&ctx->list);
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kfree_rcu(ctx, rcu_head);
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}
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static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_chanctx *ctx)
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{
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struct ieee80211_local *local __maybe_unused = sdata->local;
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lockdep_assert_held(&local->chanctx_mtx);
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rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
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ctx->refcount++;
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return 0;
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}
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static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_chanctx *ctx)
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{
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struct ieee80211_local *local __maybe_unused = sdata->local;
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lockdep_assert_held(&local->chanctx_mtx);
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ctx->refcount--;
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rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
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}
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static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_chanctx_conf *conf;
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struct ieee80211_chanctx *ctx;
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lockdep_assert_held(&local->chanctx_mtx);
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conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
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lockdep_is_held(&local->chanctx_mtx));
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if (!conf)
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return;
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ctx = container_of(conf, struct ieee80211_chanctx, conf);
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ieee80211_unassign_vif_chanctx(sdata, ctx);
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if (ctx->refcount == 0)
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ieee80211_free_chanctx(local, ctx);
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}
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int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_channel *channel,
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enum nl80211_channel_type channel_type,
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enum ieee80211_chanctx_mode mode)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_chanctx *ctx;
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int ret;
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mutex_lock(&local->chanctx_mtx);
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__ieee80211_vif_release_channel(sdata);
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ctx = ieee80211_find_chanctx(local, channel, channel_type, mode);
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if (!ctx)
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ctx = ieee80211_new_chanctx(local, channel, channel_type, mode);
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if (IS_ERR(ctx)) {
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ret = PTR_ERR(ctx);
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goto out;
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}
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ret = ieee80211_assign_vif_chanctx(sdata, ctx);
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if (ret) {
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/* if assign fails refcount stays the same */
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if (ctx->refcount == 0)
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ieee80211_free_chanctx(local, ctx);
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goto out;
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}
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out:
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mutex_unlock(&local->chanctx_mtx);
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return ret;
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}
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void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
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{
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mutex_lock(&sdata->local->chanctx_mtx);
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__ieee80211_vif_release_channel(sdata);
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mutex_unlock(&sdata->local->chanctx_mtx);
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}
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@ -658,6 +658,30 @@ enum ieee80211_sdata_state_bits {
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SDATA_STATE_OFFCHANNEL,
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};
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/**
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* enum ieee80211_chanctx_mode - channel context configuration mode
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*
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* @IEEE80211_CHANCTX_SHARED: channel context may be used by
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* multiple interfaces
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* @IEEE80211_CHANCTX_EXCLUSIVE: channel context can be used
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* only by a single interface. This can be used for example for
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* non-fixed channel IBSS.
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*/
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enum ieee80211_chanctx_mode {
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IEEE80211_CHANCTX_SHARED,
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IEEE80211_CHANCTX_EXCLUSIVE
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};
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struct ieee80211_chanctx {
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struct list_head list;
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struct rcu_head rcu_head;
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enum ieee80211_chanctx_mode mode;
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int refcount;
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struct ieee80211_chanctx_conf conf;
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};
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struct ieee80211_sub_if_data {
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struct list_head list;
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@ -987,6 +1011,10 @@ struct ieee80211_local {
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struct ieee80211_channel *tmp_channel;
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enum nl80211_channel_type tmp_channel_type;
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/* channel contexts */
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struct list_head chanctx_list;
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struct mutex chanctx_mtx;
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/* SNMP counters */
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/* dot11CountersTable */
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u32 dot11TransmittedFragmentCount;
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@ -1510,6 +1538,13 @@ bool ieee80211_set_channel_type(struct ieee80211_local *local,
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enum nl80211_channel_type
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ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper);
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int __must_check
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ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_channel *channel,
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enum nl80211_channel_type channel_type,
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enum ieee80211_chanctx_mode mode);
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void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata);
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#ifdef CONFIG_MAC80211_NOINLINE
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#define debug_noinline noinline
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#else
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@ -626,6 +626,9 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
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spin_lock_init(&local->filter_lock);
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spin_lock_init(&local->queue_stop_reason_lock);
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INIT_LIST_HEAD(&local->chanctx_list);
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mutex_init(&local->chanctx_mtx);
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/*
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* The rx_skb_queue is only accessed from tasklets,
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* but other SKB queues are used from within IRQ
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