[RFCv2 0/2] Add new transmit data path for ethernet frame format

[RFCv2 0/2] Add new transmit data path for ethernet frame format

[mpubbise]

From: Manikanta Pubbisetty <mpubbise@qti.qualcomm.com>

This patch set adds a new transmit data path to offload 802.11 header
encap to driver/hardware. Drivers having support for ieee80211
header encap and other offload functionalities which can't be done
before encap can make use of this new data path. Currently it is
implemented for STA and AP interface type, this can be extend other
interface types like adhoc.

This patchset only adds support for tx in ethernet frame format
and receive can happen in 802.11 format with existing rx framework.

With ath10k driver changes using this new Tx/Rx path, 10 - 15%
CPU usage and upto ~20Mbps TCP performance improvements are
observed with this ethernet data path.

Vasanthakumar Thiagarajan (2):
  mac80211: Add provision for 802.11 encap offload
  mac80211: Implement data xmit for 802.11 encap offload

V2:
 * 802.11 decap offload is removed from the patchset
 * Code changes as per review comments of v1.

 include/net/mac80211.h     |   30 ++++++-
 net/mac80211/cfg.c         |    9 ++
 net/mac80211/debugfs.c     |    1 +
 net/mac80211/ieee80211_i.h |   10 +++
 net/mac80211/iface.c       |   72 +++++++++++++++
 net/mac80211/key.c         |    3 +
 net/mac80211/status.c      |   79 +++++++++++++++++
 net/mac80211/tx.c          |  207 +++++++++++++++++++++++++++++++++++++++++++-
 8 files changed, 406 insertions(+), 5 deletions(-)

-- 
1.7.9.5

[RFCv2 1/2] mac80211: Add provision for 802.11 encap offload

[mpubbise]

From: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>

Drivers can have the capability to offload 802.11 encap
to firmware or hardware for data frames. This patch adds a new
hw_flag for driver to advertise the offload support.
Transmit path offloading 802.11 header (including cipher headers)
encap for data frames will be implemented in a separate patch.

Drivers advertising this capability should also implement other
functionalities which deal with 802.11 frame format like below

        - Hardware encryption
        - Aggregation of A-MSDU offload
        - Fragmentation offload

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
Signed-off-by: Manikanta Pubbisetty <mpubbise@qti.qualcomm.com>
---
 include/net/mac80211.h |    4 ++++
 net/mac80211/debugfs.c |    1 +
 2 files changed, 5 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 3edb469..0239b7d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2049,6 +2049,9 @@ struct ieee80211_txq {
  *	The stack will not do fragmentation.
  *	The callback for @set_frag_threshold should be set as well.
  *
+ * @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 {
@@ -2091,6 +2094,7 @@ enum ieee80211_hw_flags {
 	IEEE80211_HW_TX_FRAG_LIST,
 	IEEE80211_HW_REPORTS_LOW_ACK,
 	IEEE80211_HW_SUPPORTS_TX_FRAG,
+	IEEE80211_HW_SUPPORTS_80211_ENCAP,
 
 	/* keep last, obviously */
 	NUM_IEEE80211_HW_FLAGS
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 5fae001..b97ffb4 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -211,6 +211,7 @@ static ssize_t reset_write(struct file *file, const char __user *user_buf,
 	FLAG(TX_FRAG_LIST),
 	FLAG(REPORTS_LOW_ACK),
 	FLAG(SUPPORTS_TX_FRAG),
+	FLAG(SUPPORTS_80211_ENCAP),
 #undef FLAG
 };
 
-- 
1.7.9.5

[RFCv2 2/2] mac80211: Implement data xmit for 802.11 encap offload

[mpubbise]

From: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>

Driver (or hw) supporting 802.11 encapsulation offload
for data frames can make use of this new xmit path.

This patch defines new ndo_ops, all these callbacks are same as
ieee80211_dataif_ops other than ndo_start_xmit() which does
minimal processing leaving 802.11 encap related to driver.

This patch makes netdev_ops registration based on the
driver/hardware capability for 802.11 encap offload and interface type.

There is a field, no_80211_encap, added to ieee80211_tx_info:control
to mark if the 802.11 encapsulation is offloaded to driver.
There is also a new callback for tx completion status indication
to handle data frames using 802.11 encap offload.

Currently ath10k fw is capable of doing 802.11 encapsulation offload
and with the corresponding driver changes, 802.11 encap offload
might improve performance.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
Signed-off-by: Manikanta Pubbisetty <mpubbise@qti.qualcomm.com>
---
 include/net/mac80211.h     |   26 +++++-
 net/mac80211/cfg.c         |    9 ++
 net/mac80211/ieee80211_i.h |   11 +++
 net/mac80211/iface.c       |   72 +++++++++++++++
 net/mac80211/key.c         |    3 +
 net/mac80211/status.c      |   82 ++++++++++++++++++
 net/mac80211/tx.c          |  207 +++++++++++++++++++++++++++++++++++++++++++-
 7 files changed, 405 insertions(+), 5 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 0239b7d..b9e74b3 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -921,7 +921,12 @@ struct ieee80211_tx_info {
 			};
 			struct ieee80211_key_conf *hw_key;
 			u32 flags;
-			/* 4 bytes free */
+			/* XXX: This frame is not encapsulated with 802.11
+			 * header. Should this be added to %IEEE80211_TX_CTRL_*
+			 * flags?.
+			 */
+			bool no_80211_encap;
+			/* 3 bytes free */
 		} control;
 		struct {
 			u64 cookie;
@@ -4265,6 +4270,25 @@ 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
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 9c7490c..e1c6f3e 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -129,6 +129,9 @@ static int ieee80211_change_iface(struct wiphy *wiphy,
 		}
 	}
 
+	if (!ieee80211_sdata_running(sdata))
+		ieee80211_if_check_80211_encap_offl(sdata);
+
 	return 0;
 }
 
@@ -2273,6 +2276,12 @@ 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_iface_uses_80211_encap_offl(local))
+			return -EINVAL;
+
+		if (!local->ops->set_frag_threshold)
+			return -EINVAL;
+
 		err = drv_set_frag_threshold(local, wiphy->frag_threshold);
 
 		if (err) {
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 0e71843..1618806 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -966,6 +966,8 @@ struct ieee80211_sub_if_data {
 	} debugfs;
 #endif
 
+	bool data_80211_encap_offloaded;
+
 	/* must be last, dynamically sized area in this! */
 	struct ieee80211_vif vif;
 };
@@ -1696,6 +1698,8 @@ 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);
+void ieee80211_if_check_80211_encap_offl(struct ieee80211_sub_if_data *sdata);
+bool ieee80211_iface_uses_80211_encap_offl(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);
@@ -1723,6 +1727,8 @@ 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_8023_start_xmit(struct sk_buff *skb,
+					    struct net_device *dev);
 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
 				  struct net_device *dev,
 				  u32 info_flags);
@@ -1877,6 +1883,11 @@ void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
 				 struct sk_buff *skb, int tid,
 				 enum nl80211_band band);
 
+/* 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 40813dd..d8cabfa 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1161,6 +1161,17 @@ static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 	.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_8023_start_xmit,
+	.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,
+};
+
 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 					  struct sk_buff *skb,
 					  void *accel_priv,
@@ -1194,6 +1205,63 @@ static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 	.ndo_get_stats64	= ieee80211_get_stats64,
 };
 
+static bool
+ieee80211_if_encap_offl_supported(struct ieee80211_sub_if_data *sdata)
+{
+	struct ieee80211_local *local = sdata->local;
+
+	if (!ieee80211_hw_check(&local->hw, SUPPORTS_80211_ENCAP))
+		return false;
+
+	if (local->hw.wiphy->frag_threshold != (u32)-1 &&
+	    !local->ops->set_frag_threshold)
+		return false;
+
+	switch (sdata->vif.type) {
+	case NL80211_IFTYPE_AP:
+		return true;
+	case NL80211_IFTYPE_STATION:
+		if (sdata->u.mgd.use_4addr)
+			return false;
+		return true;
+	case NL80211_IFTYPE_AP_VLAN:
+		if (sdata->wdev.use_4addr)
+			return false;
+		return true;
+	default:
+		return false;
+	}
+}
+
+void ieee80211_if_check_80211_encap_offl(struct ieee80211_sub_if_data *sdata)
+{
+	if (!sdata->dev)
+		return;
+
+	if (!ieee80211_if_encap_offl_supported(sdata))
+		return;
+
+	sdata->dev->netdev_ops = &ieee80211_dataif_8023_ops;
+	sdata->data_80211_encap_offloaded = true;
+}
+
+bool ieee80211_iface_uses_80211_encap_offl(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->data_80211_encap_offloaded) {
+			offloaded = true;
+			break;
+		}
+	}
+	mutex_unlock(&local->iflist_mtx);
+
+	return offloaded;
+}
+
 static void ieee80211_if_free(struct net_device *dev)
 {
 	free_percpu(dev->tstats);
@@ -1425,6 +1493,8 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 
 	sdata->noack_map = 0;
 
+	sdata->data_80211_encap_offloaded = false;
+
 	/* only monitor/p2p-device differ */
 	if (sdata->dev) {
 		sdata->dev->netdev_ops = &ieee80211_dataif_ops;
@@ -1907,6 +1977,8 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 	list_add_tail_rcu(&sdata->list, &local->interfaces);
 	mutex_unlock(&local->iflist_mtx);
 
+	ieee80211_if_check_80211_encap_offl(sdata);
+
 	if (new_wdev)
 		*new_wdev = &sdata->wdev;
 
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index a98fc2b..960eed1 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -193,6 +193,9 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 			  key->conf.keyidx,
 			  sta ? sta->sta.addr : bcast_addr, ret);
 
+	if (sdata->data_80211_encap_offloaded)
+		return -EINVAL;
+
  out_unsupported:
 	switch (key->conf.cipher) {
 	case WLAN_CIPHER_SUITE_WEP40:
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index a3af6e1..620a826 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -952,6 +952,88 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 }
 EXPORT_SYMBOL(ieee80211_tx_status);
 
+/* TODO: Check the possibility to use ieee80211_tx_status for reporting the tx status
+ * of 802.11 encap offloaded frames.
+ */
+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(info->control.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 ba8d7db..1d7844e 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1250,12 +1250,18 @@ static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 	struct ieee80211_txq *txq = NULL;
+	bool is_data;
 
 	if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
 	    (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
 		return NULL;
 
-	if (!ieee80211_is_data(hdr->frame_control))
+	if (!info->control.no_80211_encap)
+		is_data = ieee80211_is_data(hdr->frame_control);
+	else
+		is_data = true;
+
+	if (!is_data)
 		return NULL;
 
 	if (sta) {
@@ -1427,6 +1433,7 @@ void ieee80211_txq_purge(struct ieee80211_local *local,
 {
 	struct fq *fq = &local->fq;
 	struct fq_tin *tin = &txqi->tin;
+	struct ieee80211_tx_info *info;
 
 	fq_tin_reset(fq, tin, fq_skb_free_func);
 	ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
@@ -2262,9 +2269,9 @@ 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;
 
@@ -3432,6 +3439,9 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
 	hdr = (struct ieee80211_hdr *)skb->data;
 	info = IEEE80211_SKB_CB(skb);
 
+	if (info->control.no_80211_encap)
+		goto out;
+
 	memset(&tx, 0, sizeof(tx));
 	__skb_queue_head_init(&tx.skbs);
 	tx.local = local;
@@ -3705,6 +3715,185 @@ 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);
+
+	/* TODO: Update throughput led trigger with the number of tx bytes */
+
+	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;
+
+	/* XXX: Add a generic helper for this */
+	if (sdata->vif.type == NL80211_IFTYPE_AP ||
+	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
+	    sdata->vif.type == NL80211_IFTYPE_ADHOC)
+		ra = ehdr->h_dest;
+
+	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;
+	}
+
+	if (!ra)
+		goto out_free;
+
+	multicast = is_multicast_ether_addr(ra);
+
+	if (sta)
+		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
+
+	/* XXX: Should we add new txrx stats for 802.3 to update stats
+	 * like if the frame is dropped due to unathourized port,
+	 * just like the ones available in tx_handlers?.
+	 */
+
+	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.no_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_8023_start_xmit(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->data_80211_encap_offloaded))) {
+		kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	if (unlikely(skb->len < ETH_HLEN)) {
+		kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+
+	/* TODO: Extend it for Adhoc interface type */
+	if (WARN_ON(dev->ieee80211_ptr->use_4addr ||
+		    (sdata->vif.type != NL80211_IFTYPE_STATION &&
+		     sdata->vif.type != NL80211_IFTYPE_AP &&
+		     sdata->vif.type != NL80211_IFTYPE_AP_VLAN))) {
+		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)
@@ -3783,6 +3972,16 @@ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
 		}
 		info->band = chanctx_conf->def.chan->band;
 		result = ieee80211_tx(sdata, NULL, skb, true);
+	} else if (info->control.no_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;
 
-- 
1.7.9.5

Re: [RFCv2 1/2] mac80211: Add provision for 802.11 encap offload

[Johannes Berg]

On Fri, 2017-03-03 at 17:03 +0530, mpubbise@qti.qualcomm.com wrote:
> From: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
> 
> Drivers can have the capability to offload 802.11 encap
> to firmware or hardware for data frames. This patch adds a new
> hw_flag for driver to advertise the offload support.
> Transmit path offloading 802.11 header (including cipher headers)
> encap for data frames will be implemented in a separate patch.
> 
> Drivers advertising this capability should also implement other
> functionalities which deal with 802.11 frame format like below
> 
>         - Hardware encryption
>         - Aggregation of A-MSDU offload
>         - Fragmentation offload

Not much point in having this as a separate patch, but this
documentation paragraph should move into the documentation for the new
flag in mac80211.h

johannes

Re: [RFCv2 2/2] mac80211: Implement data xmit for 802.11 encap offload

[Johannes Berg]

> There is a field, no_80211_encap, added to ieee80211_tx_info:control
> to mark if the 802.11 encapsulation is offloaded to driver.

Why is that needed? Since you have a separate TX path (ndo_start_xmit),
wouldn't it make more sense to call into a drv_tx_8023() or something
like that instead?

> There is also a new callback for tx completion status indication
> to handle data frames using 802.11 encap offload.

Maybe you could just use _noskb?

Haven't really looked at the rest all that much, few comments:

 * not sure you're handling non-linear frames right, are you assuming
   the driver can handle them? probably a fair assumption, but should
   be documented
 * you seem to also be assuming that the driver not only does all
   encryption in HW (which is obviously needed) but also does all the
   key lookups etc. - also seems fair, but also should be documented
 * similarly for a lot of other (all?) fields in tx_info
 * you seem to be assuming that if encap offload is supported then it's
   also *desired* for AP/VLAN and client interfaces, if not 4-addr.
   This seems ... probably about right, but if drivers don't always
   support it? Or support it in more cases? Perhaps we can move the
   SUPPORTS_80211_ENCAP flag into a VIF flag instead, so they can do it
   more fine-grained?

johannes

RE: [RFCv2 2/2] mac80211: Implement data xmit for 802.11 encap offload

[Pubbisetty, Manikanta]

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RE: [RFCv2 1/2] mac80211: Add provision for 802.11 encap offload

[Pubbisetty, Manikanta]

Pj4gRHJpdmVycyBjYW4gaGF2ZSB0aGUgY2FwYWJpbGl0eSB0byBvZmZsb2FkIDgwMi4xMSBlbmNh
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Cg==

Re: [RFCv2 2/2] mac80211: Implement data xmit for 802.11 encap offload

[Johannes Berg]

> > Why is that needed? Since you have a separate TX path
> > (ndo_start_xmit),
> > wouldn't it make more sense to call into a drv_tx_8023() or
> > something like that instead?
> > 
> 
> [Manikanta]  Yes, it makes sense having a separate driver hook
> instead of using drv_tx, but in case of drivers (fe ath10k) 
> where enqueuing and dequeuing tx logic (wake_tx_queue and
> ieee80211_tx_dequeue) is used there should be a way
> to indicate that the packet is not 80211 encapsulated, isn't it?
> Correct me if I am missing anything.

Ah, interesting. Yeah, I guess that makes some sense then, though I'm
not super happy with sharing the code paths between differently
encapsulated frames - best to leave that as minimal as possible.

> [Manikanta]  Hmmm you are right. I just went through the code, seems
> ieee80211_tx_status_noskb does most of them what
> ieee80211_tx_status_8023 is doing, resetting the station connection
> monitoring logic and updating last known tx rate is missing in
> _noskb. These are required, isn't it?

Maybe. I don't think the tx rate is strictly required but would be
nice, while the monitoring logic is probably needed only to avoid
spurious null data packets over the air.

However, come to think of it, we need to see how this interacts with
the tx status thing - if tx status is requested then I believe _no_skb
cannot be used.

> [Manikanta] You are correct. It is good if driver advertises the vif
> types it support in encap offload mode, but how can we decide the
> netdev_ops to be used while creating the vif? drv_add_interface will
> be invoked from ndo_open and
> even before invoking driver add_interface we have to make the
> decision of using Ethernet mode netdev_ops or the default netdev_ops,
> isn't it?

It might not be a problem to swap the dev->netdev_ops, changing only
the start_xmit, while the interface is being brought up. I assume the
driver can make this decision in add_interface(), and I think swapping
there should be OK. It might be problematic if this value changes
during suspend/resume or HW restart though.

> Can we have a separate driver hook which gives whether 80211 encap
> offload is supported for the given interface type and then decide the
> netdev_ops to be attached for the vif?

I don't think that makes sense, since you can't know if the interface
will ever be brought up, so the driver can't make a good decision since
it normally doesn't have to care about interfaces that aren't brought
up.

The only real alternative I see, which might be preferable, is for the
driver to advertise a bitmap of interface types that it wants to use
ethernet framing with.

johannes

RE: [RFCv2 2/2] mac80211: Implement data xmit for 802.11 encap offload

[Pubbisetty, Manikanta]

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Re: [RFCv2 2/2] mac80211: Implement data xmit for 802.11 encap offload

[Johannes Berg]

Hi,

[Manikanta] In that case I will keep this change, should we consider
a separate driver hook for legacy/mgmt tx like drv_tx_8023??
> How about having wake_tx_queue_8023 and ieee80211_tx_dequeue_8023 so
> that Ethernet transmit path is totally exclusive. Thoughts??

I'm not sure this will work well. The driver might have more space for
sending to a specific station, but doesn't really know which frames
should go first. So either it'd have to call both (dequeue_8023
followed by dequeue) with mac80211 sorting out what to do, or we should
keep it combined. I think mac80211 sorting out the priority here etc.
would be far more complex than this.

> [Manikanta] Hmmm, I would like to have ieee80211_tx_status_8023 for
> now and go with a TODO for single tx reporting mechanism for both
> Ethernet and 802.11 tx formats. Any thoughts?

There's an additional wrinkle btw - we currently report the 802.11
frame to the monitor interface, if active. Not sure we can keep that,
but it's something to think about.

> > The only real alternative I see, which might be preferable, is for
> > the driver to advertise a bitmap of interface types that it wants
> > to use ethernet framing with.
> > 
> 
> [Manikanta] Correct, this would be a onetime registration. Isn't it ?
> I am just curious to know whether the supported vif types for
> ethernet framing can change dynamically, is this possible?

I don't see why it would change. I guess there's a small chance that
you might design the HW in a way that it only has enough HW resources
to do header format conversion for a limited number of interfaces, but
if that ends up being a problem we can perhaps add more other
capabilities.

The way we're looking at it will be type/header format dependent,
nothing else.

johannes

RE: [RFCv2 2/2] mac80211: Implement data xmit for 802.11 encap offload

[Manikanta Pubbisetty]

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Re: [RFCv2 2/2] mac80211: Implement data xmit for 802.11 encap offload

[Johannes Berg]

Sorry, almost dropped this thread - my bad.

> > > [Manikanta] Hmmm, I would like to have ieee80211_tx_status_8023
> > > for
> > > now and go with a TODO for single tx reporting mechanism for both
> > > Ethernet and 802.11 tx formats. Any thoughts?
> > 
> > There's an additional wrinkle btw - we currently report the 802.11
> > frame to the monitor interface, if active. Not sure we can keep
> > that, but it's something to think about.
> > 
> 
> [Manikanta] Good point, this is something we have to think about. I
> believe this one is tricky, do we need to add the .11 header just
> before giving to monitor interfaces?

It's complicated. The interface has radiotap+802.11 type, so on the one
hand it should have 802.11 header. On the other hand, having what went
to the hardware can be helpful. However, I don't think we can get
around the radiotap+802.11 type in any way.

> How important will this be for Ethernet tx changes? I am running out
> of thoughts.

Well I think it's something we should consider when we look at this
path. Hopefully nobody who really cares about performance has the
monitor stuff active - although we're thinking of ways to push down
filters to make that less expensive.

johannes

RE: [RFCv2 2/2] mac80211: Implement data xmit for 802.11 encap offload

[Manikanta Pubbisetty]

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