Subject: Re: [RFC V3 1/2] mac80211: add hw 80211 encapsulation offloading
 support
To:     John Crispin <john@phrozen.org>,
        Johannes Berg <johannes@sipsolutions.net>,
        Kalle Valo <kvalo@codeaurora.org>
Cc:     linux-wireless@vger.kernel.org,
        Shashidhar Lakkavalli <slakkavalli@datto.com>,
        Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
References: <20190401131416.22646-1-john@phrozen.org>
 <20190401131416.22646-2-john@phrozen.org>
From:   Sebastian Gottschall <s.gottschall@newmedia-net.de>
Message-ID: <fff76783-1298-9315-6706-f8eaea393c6b@newmedia-net.de>
Date:   Tue, 2 Apr 2019 11:31:34 +0200
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the introduced control field hw_80211_encap in ieee80211_tx_info leads 
to a compile assert
/include/linux/compiler.h:522:38: error: call to 
'__compiletime_assert_1307' declared with attribute error: BUILD_BUG_ON 
failed: sizeof(struct ieee80211_tx_info) > sizeof(skb->cb)

skb->cb is to small on x64 devices
i suggest to implement hw_80211_encap in ieee80211_vif which is a member 
of control in ieee80211_tx_info

Sebastian

Am 01.04.2019 um 15:14 schrieb John Crispin:
> From: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
>
> This patch adds a new transmit path for hardware that supports 802.11
> encapsulation offloading. In those cases 802.3a frames get passed
> directly to the driver allowing to hardware to handle the encapsulation.
>
> Certain features wont work and the patch masks these out.
> * monitor interfaces are not supported if any of the vif is in encap mode.
> * amsdu/non-linear frames wont work in encap offloading mode.
> * TKIP countermeasures cannot be triggered and hence those keys are not
>    accepted.
>
> The patch defines a secondary netdev_ops struct that the device is assigned
> to the device if 802.11 encap support is available and enabled. The driver
> needs to enable the support on a per vif basis if it finds that all
> pre-reqs are meet.
>
> Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
> Signed-off-by: John Crispin <john@phrozen.org>
> ---
>   include/net/mac80211.h     |  25 ++++++
>   net/mac80211/cfg.c         |  12 ++-
>   net/mac80211/debugfs.c     |   1 +
>   net/mac80211/ieee80211_i.h |  10 +++
>   net/mac80211/iface.c       |  54 +++++++++++++
>   net/mac80211/key.c         |   3 +
>   net/mac80211/main.c        |  10 ++-
>   net/mac80211/status.c      |  79 +++++++++++++++++++
>   net/mac80211/tx.c          | 188 +++++++++++++++++++++++++++++++++++++++++++--
>   9 files changed, 373 insertions(+), 9 deletions(-)
>
> diff --git a/include/net/mac80211.h b/include/net/mac80211.h
> index ac2ed8ec662b..3e8929770839 100644
> --- a/include/net/mac80211.h
> +++ b/include/net/mac80211.h
> @@ -1021,6 +1021,7 @@ struct ieee80211_tx_info {
>   			struct ieee80211_key_conf *hw_key;
>   			u32 flags;
>   			codel_time_t enqueue_time;
> +			u8 hw_80211_encap;
>   		} control;
>   		struct {
>   			u64 cookie;
> @@ -2243,6 +2244,9 @@ struct ieee80211_txq {
>    * @IEEE80211_HW_SUPPORTS_ONLY_HE_MULTI_BSSID: Hardware supports multi BSSID
>    *	only for HE APs. Applies if @IEEE80211_HW_SUPPORTS_MULTI_BSSID is set.
>    *
> + * @IEEE80211_HW_SUPPORTS_80211_ENCAP: Hardware/driver supports 802.11
> + *	encap for data frames.
> + *
>    * @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
>    */
>   enum ieee80211_hw_flags {
> @@ -2294,6 +2298,7 @@ enum ieee80211_hw_flags {
>   	IEEE80211_HW_TX_STATUS_NO_AMPDU_LEN,
>   	IEEE80211_HW_SUPPORTS_MULTI_BSSID,
>   	IEEE80211_HW_SUPPORTS_ONLY_HE_MULTI_BSSID,
> +	IEEE80211_HW_SUPPORTS_80211_ENCAP,
>   
>   	/* keep last, obviously */
>   	NUM_IEEE80211_HW_FLAGS
> @@ -4587,6 +4592,25 @@ void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
>   				 struct sk_buff *skb);
>   
>   /**
> + * ieee80211_tx_status_8023 - transmit status callback for 802.3 frame format
> + *
> + * Call this function for all transmitted data frames after their transmit
> + * completion. This callback should only be called for data frames which
> + * are are using driver's (or hardware's) offload capability of encap/decap
> + * 802.11 frames.
> + *
> + * This function may not be called in IRQ context. Calls to this function
> + * for a single hardware must be synchronized against each other.
> + *
> + * @hw: the hardware the frame was transmitted by
> + * @vif: the interface for which the frame was transmitted
> + * @skb: the frame that was transmitted, owned by mac80211 after this call
> + */
> +void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
> +			       struct ieee80211_vif *vif,
> +			       struct sk_buff *skb);
> +
> +/**
>    * ieee80211_report_low_ack - report non-responding station
>    *
>    * When operating in AP-mode, call this function to report a non-responding
> @@ -6359,4 +6383,5 @@ void ieee80211_nan_func_match(struct ieee80211_vif *vif,
>   			      struct cfg80211_nan_match_params *match,
>   			      gfp_t gfp);
>   
> +void ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable);
>   #endif /* MAC80211_H */
> diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
> index 09dd1c2860fc..53b56f8fcdfc 100644
> --- a/net/mac80211/cfg.c
> +++ b/net/mac80211/cfg.c
> @@ -367,8 +367,15 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
>   
>   	/* reject WEP and TKIP keys if WEP failed to initialize */
>   	switch (params->cipher) {
> -	case WLAN_CIPHER_SUITE_WEP40:
>   	case WLAN_CIPHER_SUITE_TKIP:
> +		/* countermeasures wont work on encap offload mode so reject
> +		 * TKIP keys
> +		 */
> +		if (ieee80211_hw_check(&local->hw, SUPPORTS_80211_ENCAP))
> +			return -EINVAL;
> +
> +		/* drop through */
> +	case WLAN_CIPHER_SUITE_WEP40:
>   	case WLAN_CIPHER_SUITE_WEP104:
>   		if (IS_ERR(local->wep_tx_tfm))
>   			return -EINVAL;
> @@ -2379,6 +2386,9 @@ static int ieee80211_set_wiphy_params(struct wiphy *wiphy, u32 changed)
>   	if (changed & WIPHY_PARAM_FRAG_THRESHOLD) {
>   		ieee80211_check_fast_xmit_all(local);
>   
> +		if (ieee80211_is_hw_80211_encap(local))
> +			return -EINVAL;
> +
>   		err = drv_set_frag_threshold(local, wiphy->frag_threshold);
>   
>   		if (err) {
> diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
> index 2d43bc127043..a4df6bca192f 100644
> --- a/net/mac80211/debugfs.c
> +++ b/net/mac80211/debugfs.c
> @@ -221,6 +221,7 @@ static const char *hw_flag_names[] = {
>   	FLAG(TX_STATUS_NO_AMPDU_LEN),
>   	FLAG(SUPPORTS_MULTI_BSSID),
>   	FLAG(SUPPORTS_ONLY_HE_MULTI_BSSID),
> +	FLAG(SUPPORTS_80211_ENCAP),
>   #undef FLAG
>   };
>   
> diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
> index e170f986d226..d7569a455a06 100644
> --- a/net/mac80211/ieee80211_i.h
> +++ b/net/mac80211/ieee80211_i.h
> @@ -987,6 +987,8 @@ struct ieee80211_sub_if_data {
>   	} debugfs;
>   #endif
>   
> +	bool hw_80211_encap;
> +
>   	/* must be last, dynamically sized area in this! */
>   	struct ieee80211_vif vif;
>   };
> @@ -1732,6 +1734,7 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
>   		     struct vif_params *params);
>   int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
>   			     enum nl80211_iftype type);
> +bool ieee80211_is_hw_80211_encap(struct ieee80211_local *local);
>   void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata);
>   void ieee80211_remove_interfaces(struct ieee80211_local *local);
>   u32 ieee80211_idle_off(struct ieee80211_local *local);
> @@ -1759,6 +1762,8 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
>   					 struct net_device *dev);
>   netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
>   				       struct net_device *dev);
> +netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
> +					    struct net_device *dev);
>   void __ieee80211_subif_start_xmit(struct sk_buff *skb,
>   				  struct net_device *dev,
>   				  u32 info_flags);
> @@ -1933,6 +1938,11 @@ void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
>   				 struct sk_buff *skb, int tid,
>   				 enum nl80211_band band, u32 txdata_flags);
>   
> +/* sta_out needs to be checked for ERR_PTR() before using */
> +int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
> +			    struct sk_buff *skb,
> +			    struct sta_info **sta_out);
> +
>   static inline void
>   ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
>   			  struct sk_buff *skb, int tid,
> diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
> index 4a6ff1482a9f..4090c2c5fde0 100644
> --- a/net/mac80211/iface.c
> +++ b/net/mac80211/iface.c
> @@ -1177,6 +1177,59 @@ static const struct net_device_ops ieee80211_dataif_ops = {
>   	.ndo_get_stats64	= ieee80211_get_stats64,
>   };
>   
> +static const struct net_device_ops ieee80211_dataif_8023_ops = {
> +	.ndo_open		= ieee80211_open,
> +	.ndo_stop		= ieee80211_stop,
> +	.ndo_uninit		= ieee80211_uninit,
> +	.ndo_start_xmit		= ieee80211_subif_start_xmit_8023,
> +	.ndo_set_rx_mode	= ieee80211_set_multicast_list,
> +	.ndo_set_mac_address	= ieee80211_change_mac,
> +	.ndo_select_queue	= ieee80211_netdev_select_queue,
> +	.ndo_get_stats64	= ieee80211_get_stats64,
> +};
> +
> +void ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable)
> +{
> +	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
> +	struct ieee80211_local *local = sdata->local;
> +
> +	if (!sdata->dev)
> +		return;
> +
> +	if (!ieee80211_hw_check(&local->hw, SUPPORTS_80211_ENCAP))
> +		enable = 0;
> +
> +	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
> +	    (local->hw.wiphy->frag_threshold != (u32)-1))
> +		enable = 0;
> +
> +	if (enable) {
> +		sdata->dev->netdev_ops = &ieee80211_dataif_8023_ops;
> +		sdata->hw_80211_encap = true;
> +	} else {
> +		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
> +		sdata->hw_80211_encap = false;
> +	}
> +}
> +EXPORT_SYMBOL(ieee80211_set_hw_80211_encap);
> +
> +bool ieee80211_is_hw_80211_encap(struct ieee80211_local *local)
> +{
> +	struct ieee80211_sub_if_data *sdata;
> +	bool offloaded = false;
> +
> +	mutex_lock(&local->iflist_mtx);
> +	list_for_each_entry(sdata, &local->interfaces, list) {
> +		if (sdata->hw_80211_encap) {
> +			offloaded = true;
> +			break;
> +		}
> +	}
> +	mutex_unlock(&local->iflist_mtx);
> +
> +	return offloaded;
> +}
> +
>   static u16 ieee80211_monitor_select_queue(struct net_device *dev,
>   					  struct sk_buff *skb,
>   					  struct net_device *sb_dev,
> @@ -1409,6 +1462,7 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
>   	sdata->vif.bss_conf.idle = true;
>   
>   	sdata->noack_map = 0;
> +	sdata->hw_80211_encap = false;
>   
>   	/* only monitor/p2p-device differ */
>   	if (sdata->dev) {
> diff --git a/net/mac80211/key.c b/net/mac80211/key.c
> index 4700718e010f..861b67d43eb7 100644
> --- a/net/mac80211/key.c
> +++ b/net/mac80211/key.c
> @@ -197,6 +197,9 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
>   			  key->conf.keyidx,
>   			  sta ? sta->sta.addr : bcast_addr, ret);
>   
> +	if (sdata->hw_80211_encap)
> +		return -EINVAL;
> +
>    out_unsupported:
>   	switch (key->conf.cipher) {
>   	case WLAN_CIPHER_SUITE_WEP40:
> diff --git a/net/mac80211/main.c b/net/mac80211/main.c
> index 800e67615e2a..a49bcec3891e 100644
> --- a/net/mac80211/main.c
> +++ b/net/mac80211/main.c
> @@ -1000,9 +1000,13 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
>   		hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
>   	}
>   
> -	/* mac80211 always supports monitor */
> -	hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
> -	hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
> +	if (ieee80211_hw_check(hw, SUPPORTS_80211_ENCAP)) {
> +		/* mac80211 always supports monitor unless we do 802.11
> +		 * encapsulation offloading.
> +		 */
> +		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
> +		hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
> +	}
>   
>   	/* mac80211 doesn't support more than one IBSS interface right now */
>   	for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
> diff --git a/net/mac80211/status.c b/net/mac80211/status.c
> index 5b9952b1caf3..8feafaab88a4 100644
> --- a/net/mac80211/status.c
> +++ b/net/mac80211/status.c
> @@ -1019,6 +1019,85 @@ void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
>   }
>   EXPORT_SYMBOL(ieee80211_tx_rate_update);
>   
> +void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
> +			      struct ieee80211_vif *vif,
> +			      struct sk_buff *skb)
> +{
> +	struct ieee80211_local *local = hw_to_local(hw);
> +	struct ieee80211_sub_if_data *sdata;
> +	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
> +	struct sta_info *sta;
> +	int retry_count;
> +	int rates_idx;
> +	bool acked;
> +
> +	if (WARN_ON(!ieee80211_hw_check(hw, SUPPORTS_80211_ENCAP)))
> +		goto skip_stats_update;
> +
> +	sdata = vif_to_sdata(vif);
> +
> +	acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
> +	rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
> +
> +	rcu_read_lock();
> +
> +	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
> +		rcu_read_unlock();
> +		goto counters_update;
> +	}
> +
> +	if (!sta || IS_ERR(sta)) {
> +		rcu_read_unlock();
> +		goto counters_update;
> +	}
> +
> +	if (!acked)
> +		sta->status_stats.retry_failed++;
> +
> +	if (rates_idx != -1)
> +		sta->tx_stats.last_rate = info->status.rates[rates_idx];
> +
> +	sta->status_stats.retry_count += retry_count;
> +
> +	if (ieee80211_hw_check(hw, REPORTS_TX_ACK_STATUS)) {
> +		if (acked && vif->type == NL80211_IFTYPE_STATION)
> +			ieee80211_sta_reset_conn_monitor(sdata);
> +
> +		sta->status_stats.last_ack = jiffies;
> +		if (info->flags & IEEE80211_TX_STAT_ACK) {
> +			if (sta->status_stats.lost_packets)
> +				sta->status_stats.lost_packets = 0;
> +
> +			if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
> +				sta->status_stats.last_tdls_pkt_time = jiffies;
> +		} else {
> +			ieee80211_lost_packet(sta, info);
> +		}
> +	}
> +
> +	rcu_read_unlock();
> +
> +counters_update:
> +	ieee80211_led_tx(local);
> +
> +	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
> +	    !(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED))
> +		goto skip_stats_update;
> +
> +	I802_DEBUG_INC(local->dot11TransmittedFrameCount);
> +	if (is_multicast_ether_addr(skb->data))
> +		I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
> +	if (retry_count > 0)
> +		I802_DEBUG_INC(local->dot11RetryCount);
> +	if (retry_count > 1)
> +		I802_DEBUG_INC(local->dot11MultipleRetryCount);
> +
> +skip_stats_update:
> +	ieee80211_report_used_skb(local, skb, false);
> +	dev_kfree_skb(skb);
> +}
> +EXPORT_SYMBOL(ieee80211_tx_status_8023);
> +
>   void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
>   {
>   	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
> diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
> index 8a49a74c0a37..85356c208c02 100644
> --- a/net/mac80211/tx.c
> +++ b/net/mac80211/tx.c
> @@ -1253,7 +1253,8 @@ static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
>   	    (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
>   		return NULL;
>   
> -	if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
> +	if (!info->control.hw_80211_encap &&
> +	    unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
>   		if ((!ieee80211_is_mgmt(hdr->frame_control) ||
>   		     ieee80211_is_bufferable_mmpdu(hdr->frame_control) ||
>   		     vif->type == NL80211_IFTYPE_STATION) &&
> @@ -1400,6 +1401,7 @@ static void ieee80211_txq_enqueue(struct ieee80211_local *local,
>   	struct fq *fq = &local->fq;
>   	struct fq_tin *tin = &txqi->tin;
>   
> +	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
>   	ieee80211_set_skb_enqueue_time(skb);
>   	fq_tin_enqueue(fq, tin, skb,
>   		       fq_skb_free_func,
> @@ -2357,9 +2359,9 @@ static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
>   	       skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
>   }
>   
> -static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
> -				   struct sk_buff *skb,
> -				   struct sta_info **sta_out)
> +int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
> +			    struct sk_buff *skb,
> +			    struct sta_info **sta_out)
>   {
>   	struct sta_info *sta;
>   
> @@ -2855,7 +2857,9 @@ void ieee80211_check_fast_xmit(struct sta_info *sta)
>   	struct ieee80211_chanctx_conf *chanctx_conf;
>   	__le16 fc;
>   
> -	if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
> +	/* check for driver support and ieee80211 encap offload */
> +	if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) ||
> +	    sdata->hw_80211_encap)
>   		return;
>   
>   	/* Locking here protects both the pointer itself, and against concurrent
> @@ -3554,6 +3558,9 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
>   	hdr = (struct ieee80211_hdr *)skb->data;
>   	info = IEEE80211_SKB_CB(skb);
>   
> +	if (info->control.hw_80211_encap)
> +		goto out;
> +
>   	memset(&tx, 0, sizeof(tx));
>   	__skb_queue_head_init(&tx.skbs);
>   	tx.local = local;
> @@ -4003,6 +4010,167 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
>   	return NETDEV_TX_OK;
>   }
>   
> +static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
> +			      struct sk_buff *skb, int led_len,
> +			      struct sta_info *sta,
> +			      bool txpending)
> +{
> +	struct ieee80211_local *local = sdata->local;
> +	struct ieee80211_tx_control control = {};
> +	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
> +	struct ieee80211_sta *pubsta = NULL;
> +	unsigned long flags;
> +	int q = info->hw_queue;
> +
> +	if (ieee80211_queue_skb(local, sdata, sta, skb))
> +		return true;
> +
> +	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
> +
> +	if (local->queue_stop_reasons[q] ||
> +	    (!txpending && !skb_queue_empty(&local->pending[q]))) {
> +		if (txpending)
> +			skb_queue_head(&local->pending[q], skb);
> +		else
> +			skb_queue_tail(&local->pending[q], skb);
> +
> +		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
> +
> +		return false;
> +	}
> +
> +	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
> +
> +	if (sta && sta->uploaded)
> +		pubsta = &sta->sta;
> +
> +	control.sta = pubsta;
> +
> +	drv_tx(local, &control, skb);
> +
> +	return true;
> +}
> +
> +static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
> +				struct net_device *dev, struct sta_info *sta,
> +				struct sk_buff *skb)
> +{
> +	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
> +	struct ethhdr *ehdr = (struct ethhdr *)skb->data;
> +	struct ieee80211_local *local = sdata->local;
> +	bool authorized = false;
> +	bool multicast;
> +	bool tdls_peer;
> +	unsigned char *ra = NULL;
> +
> +	if (IS_ERR(sta) || (sta && !sta->uploaded))
> +		sta = NULL;
> +
> +	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
> +		tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
> +		if (tdls_peer)
> +			ra = skb->data;
> +		else
> +			ra = sdata->u.mgd.bssid;
> +	} else {
> +		ra = ehdr->h_dest;
> +	}
> +
> +	if (!ra)
> +		goto out_free;
> +	multicast = is_multicast_ether_addr(ra);
> +
> +	if (sta)
> +		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
> +
> +	if (!multicast && !authorized &&
> +	    ((ehdr->h_proto != sdata->control_port_protocol) ||
> +	     !ether_addr_equal(sdata->vif.addr, ehdr->h_source)))
> +		goto out_free;
> +
> +	if (multicast && sdata->vif.type == NL80211_IFTYPE_AP &&
> +	    !atomic_read(&sdata->u.ap.num_mcast_sta))
> +		goto out_free;
> +
> +	if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
> +	    test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
> +		goto out_free;
> +
> +	/* TODO: Handle frames requiring wifi tx status to be notified */
> +
> +	memset(info, 0, sizeof(*info));
> +
> +	if (unlikely(sdata->control_port_protocol == ehdr->h_proto)) {
> +		if (sdata->control_port_no_encrypt)
> +			info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
> +		info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
> +	}
> +
> +	if (multicast)
> +		info->flags |= IEEE80211_TX_CTL_NO_ACK;
> +
> +	info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
> +
> +	ieee80211_tx_stats(dev, skb->len);
> +
> +	if (sta) {
> +		sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
> +		sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
> +	}
> +
> +	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
> +		sdata = container_of(sdata->bss,
> +				     struct ieee80211_sub_if_data, u.ap);
> +
> +	info->control.hw_80211_encap = true;
> +	info->control.vif = &sdata->vif;
> +
> +	ieee80211_tx_8023(sdata, skb, skb->len, sta, false);
> +
> +	return;
> +
> +out_free:
> +	kfree_skb(skb);
> +}
> +
> +netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
> +					    struct net_device *dev)
> +{
> +	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
> +	struct sta_info *sta;
> +
> +	if (WARN_ON(unlikely(!sdata->hw_80211_encap))) {
> +		kfree_skb(skb);
> +		return NETDEV_TX_OK;
> +	}
> +
> +	if (unlikely(skb->len < ETH_HLEN)) {
> +		kfree_skb(skb);
> +		return NETDEV_TX_OK;
> +	}
> +
> +	if (WARN_ON(dev->ieee80211_ptr->use_4addr)) {
> +		kfree_skb(skb);
> +		return NETDEV_TX_OK;
> +	}
> +
> +	rcu_read_lock();
> +
> +	if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
> +		goto out_free;
> +
> +	ieee80211_8023_xmit(sdata, dev, sta, skb);
> +
> +	goto out;
> +
> +out_free:
> +	kfree_skb(skb);
> +out:
> +	rcu_read_unlock();
> +
> +	return NETDEV_TX_OK;
> +}
> +
>   struct sk_buff *
>   ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
>   			      struct sk_buff *skb, u32 info_flags)
> @@ -4081,6 +4249,16 @@ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
>   		}
>   		info->band = chanctx_conf->def.chan->band;
>   		result = ieee80211_tx(sdata, NULL, skb, true, 0);
> +	} else if (info->control.hw_80211_encap) {
> +		if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
> +			dev_kfree_skb(skb);
> +			return true;
> +		}
> +
> +		if (IS_ERR(sta) || (sta && !sta->uploaded))
> +			sta = NULL;
> +
> +		result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true);
>   	} else {
>   		struct sk_buff_head skbs;
>