[RFC V4 0/2] mac80211: add 802.11 encapsulation offloading

[RFC V4 0/2] mac80211: add 802.11 encapsulation offloading

[John Crispin]

This series picks up prior work from QCA. The patch is currently shipped
inside QSDK as part of the wlan-open package.

The series tries to address all feedback from the V2
-> https://patchwork.kernel.org/patch/9602585/

Changes in V3
* rebase on latest kernel
* various code style clean ups
* give so eof the variables and functions more obvious names
* move the code that disables support for non linear frames to the core
* disable monitor and tkip support

Changes in V4
* disable encap when TKIP is used instead of refusing TKIP
* use a flag inside fx_info instead of an extra element
* move 4addr detection into ieee80211_set_hw_80211_encap()
* ieee80211_tx_dequeue() was dropping out to early

Vasanthakumar Thiagarajan (2):
  mac80211: add hw 80211 encapsulation offloading support
  ath10k: add tx hw 802.11 encapusaltion offloading support

 drivers/net/wireless/ath/ath10k/core.c   |  11 ++
 drivers/net/wireless/ath/ath10k/core.h   |   3 +
 drivers/net/wireless/ath/ath10k/htt_tx.c |  24 ++--
 drivers/net/wireless/ath/ath10k/mac.c    |  70 +++++++++---
 drivers/net/wireless/ath/ath10k/txrx.c   |  11 +-
 include/net/mac80211.h                   |  25 ++++
 net/mac80211/cfg.c                       |   3 +
 net/mac80211/debugfs.c                   |   1 +
 net/mac80211/ieee80211_i.h               |  10 ++
 net/mac80211/iface.c                     |  72 ++++++++++++
 net/mac80211/key.c                       |   7 ++
 net/mac80211/main.c                      |  10 +-
 net/mac80211/status.c                    |  79 +++++++++++++
 net/mac80211/tx.c                        | 189 ++++++++++++++++++++++++++++++-
 14 files changed, 481 insertions(+), 34 deletions(-)

-- 
2.11.0

[RFC V4 1/2] mac80211: add hw 80211 encapsulation offloading support

[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         |   3 +
 net/mac80211/debugfs.c     |   1 +
 net/mac80211/ieee80211_i.h |  10 +++
 net/mac80211/iface.c       |  72 +++++++++++++++++
 net/mac80211/key.c         |   7 ++
 net/mac80211/main.c        |  10 ++-
 net/mac80211/status.c      |  79 +++++++++++++++++++
 net/mac80211/tx.c          | 189 +++++++++++++++++++++++++++++++++++++++++++--
 9 files changed, 387 insertions(+), 9 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index ac2ed8ec662b..b9e77e295361 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -816,6 +816,7 @@ enum mac80211_tx_control_flags {
 	IEEE80211_TX_CTRL_RATE_INJECT		= BIT(2),
 	IEEE80211_TX_CTRL_AMSDU			= BIT(3),
 	IEEE80211_TX_CTRL_FAST_XMIT		= BIT(4),
+	IEEE80211_TX_CTRL_HW_80211_ENCAP	= BIT(5),
 };
 
 /*
@@ -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);
 
+int 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 0a1f6e0a0548..029fb4a672de 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2379,6 +2379,9 @@ 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 5d837d10fef7..f14da8d7a21b 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;
 };
@@ -1733,6 +1735,7 @@ 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);
@@ -1760,6 +1763,8 @@ 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);
@@ -1935,6 +1940,11 @@ 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..aa8f967f2b27 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1177,6 +1177,77 @@ 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,
+};
+
+int 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 (enable == sdata->hw_80211_encap)
+		return enable;
+
+	if (!sdata->dev)
+		return 0;
+
+	if (!ieee80211_hw_check(&local->hw, SUPPORTS_80211_ENCAP))
+		enable = 0;
+
+	switch (vif->type) {
+	case NL80211_IFTYPE_STATION:
+		if (sdata->u.mgd.use_4addr)
+			enable = 0;
+		break;
+	case NL80211_IFTYPE_AP_VLAN:
+		if (sdata->wdev.use_4addr)
+			enable = 0;
+		break;
+	default:
+		break;
+	}
+
+	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;
+	}
+
+	return enable;
+}
+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 +1480,7 @@ 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..b43888556901 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -171,6 +171,10 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
 			goto out_unsupported;
 	}
 
+	/* TKIP countermeasures wont work on encap offload mode */
+	if (key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
+		ieee80211_set_hw_80211_encap(&sdata->vif, 0);
+
 	ret = drv_set_key(key->local, SET_KEY, sdata,
 			  sta ? &sta->sta : NULL, &key->conf);
 
@@ -197,6 +201,9 @@ 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..fbd4b5267e04 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.flags & IEEE80211_TX_CTRL_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) &&
@@ -2357,9 +2358,9 @@ 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 +2856,9 @@ 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
@@ -3573,6 +3576,9 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
 		goto begin;
 	}
 
+	if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP)
+		goto encap_out;
+
 	if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
 		info->flags |= IEEE80211_TX_CTL_AMPDU;
 	else
@@ -3634,8 +3640,8 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
 		break;
 	}
 
+encap_out:
 	IEEE80211_SKB_CB(skb)->control.vif = vif;
-
 out:
 	spin_unlock_bh(&fq->lock);
 
@@ -4003,6 +4009,167 @@ 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.flags |= IEEE80211_TX_CTRL_HW_80211_ENCAP;
+	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 +4248,16 @@ 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.flags & IEEE80211_TX_CTRL_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;
 
-- 
2.11.0

[RFC V4 2/2] ath10k: add tx hw 802.11 encapusaltion offloading support

[John Crispin]

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

This patch adds support for ethernet rxtx mode to the driver. The feature
is enabled via a new module parameter. If enabled to driver will enable
the feature on a per vif basis if all other requirements were met.

Testing on a IPQ4019 based hardware shows a increase in TCP throughput
of ~20% when the feature is enabled.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
Signed-off-by: John Crispin <john@phrozen.org>
---
 drivers/net/wireless/ath/ath10k/core.c   | 11 +++++
 drivers/net/wireless/ath/ath10k/core.h   |  3 ++
 drivers/net/wireless/ath/ath10k/htt_tx.c | 24 +++++++----
 drivers/net/wireless/ath/ath10k/mac.c    | 70 +++++++++++++++++++++++++-------
 drivers/net/wireless/ath/ath10k/txrx.c   | 11 ++++-
 5 files changed, 94 insertions(+), 25 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index ac2cf3f1c7b4..e3db98df806d 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -30,6 +30,7 @@ static unsigned int ath10k_cryptmode_param;
 static bool uart_print;
 static bool skip_otp;
 static bool rawmode;
+static bool ethernetmode;
 
 unsigned long ath10k_coredump_mask = BIT(ATH10K_FW_CRASH_DUMP_REGISTERS) |
 				     BIT(ATH10K_FW_CRASH_DUMP_CE_DATA);
@@ -41,6 +42,7 @@ module_param(uart_print, bool, 0644);
 module_param(skip_otp, bool, 0644);
 module_param(rawmode, bool, 0644);
 module_param_named(coredump_mask, ath10k_coredump_mask, ulong, 0444);
+module_param(ethernetmode, bool, 0644);
 
 MODULE_PARM_DESC(debug_mask, "Debugging mask");
 MODULE_PARM_DESC(uart_print, "Uart target debugging");
@@ -48,6 +50,7 @@ MODULE_PARM_DESC(skip_otp, "Skip otp failure for calibration in testmode");
 MODULE_PARM_DESC(cryptmode, "Crypto mode: 0-hardware, 1-software");
 MODULE_PARM_DESC(rawmode, "Use raw 802.11 frame datapath");
 MODULE_PARM_DESC(coredump_mask, "Bitfield of what to include in firmware crash file");
+MODULE_PARM_DESC(ethernetmode, "Use ethernet frame datapath");
 
 static const struct ath10k_hw_params ath10k_hw_params_list[] = {
 	{
@@ -2926,6 +2929,14 @@ static void ath10k_core_register_work(struct work_struct *work)
 	/* peer stats are enabled by default */
 	set_bit(ATH10K_FLAG_PEER_STATS, &ar->dev_flags);
 
+	if (ethernetmode && rawmode) {
+		ath10k_err(ar, "ethernet and raw mode cannot co-exist\n");
+		status = -EINVAL;
+		goto err;
+	}
+
+	ar->ethernetmode = ethernetmode;
+
 	status = ath10k_core_probe_fw(ar);
 	if (status) {
 		ath10k_err(ar, "could not probe fw (%d)\n", status);
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 27ec5557de88..30199a2d66b4 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -109,6 +109,7 @@ enum ath10k_skb_flags {
 	ATH10K_SKB_F_MGMT = BIT(3),
 	ATH10K_SKB_F_QOS = BIT(4),
 	ATH10K_SKB_F_RAW_TX = BIT(5),
+	ATH10K_SKB_F_HW_80211_ENCAP = BIT(6),
 };
 
 struct ath10k_skb_cb {
@@ -1187,6 +1188,8 @@ struct ath10k {
 	struct work_struct radar_confirmation_work;
 	struct ath10k_bus_params bus_param;
 
+	bool ethernetmode;
+
 	/* must be last */
 	u8 drv_priv[0] __aligned(sizeof(void *));
 };
diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c
index d8e9cc0bb772..ae4c48b8b706 100644
--- a/drivers/net/wireless/ath/ath10k/htt_tx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_tx.c
@@ -1143,6 +1143,10 @@ static u8 ath10k_htt_tx_get_tid(struct sk_buff *skb, bool is_eth)
 	struct ieee80211_hdr *hdr = (void *)skb->data;
 	struct ath10k_skb_cb *cb = ATH10K_SKB_CB(skb);
 
+	/* Firmware takes care of tid classification for ethernet format */
+	if (cb->flags & ATH10K_SKB_F_HW_80211_ENCAP)
+		return skb->priority % IEEE80211_QOS_CTL_TID_MASK;
+
 	if (!is_eth && ieee80211_is_mgmt(hdr->frame_control))
 		return HTT_DATA_TX_EXT_TID_MGMT;
 	else if (cb->flags & ATH10K_SKB_F_QOS)
@@ -1351,15 +1355,17 @@ static int ath10k_htt_tx_32(struct ath10k_htt *htt,
 	txbuf_paddr = htt->txbuf.paddr +
 		      (sizeof(struct ath10k_htt_txbuf_32) * msdu_id);
 
-	if ((ieee80211_is_action(hdr->frame_control) ||
-	     ieee80211_is_deauth(hdr->frame_control) ||
-	     ieee80211_is_disassoc(hdr->frame_control)) &&
-	     ieee80211_has_protected(hdr->frame_control)) {
-		skb_put(msdu, IEEE80211_CCMP_MIC_LEN);
-	} else if (!(skb_cb->flags & ATH10K_SKB_F_NO_HWCRYPT) &&
-		   txmode == ATH10K_HW_TXRX_RAW &&
-		   ieee80211_has_protected(hdr->frame_control)) {
-		skb_put(msdu, IEEE80211_CCMP_MIC_LEN);
+	if (!(info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP)) {
+		if ((ieee80211_is_action(hdr->frame_control) ||
+		     ieee80211_is_deauth(hdr->frame_control) ||
+		     ieee80211_is_disassoc(hdr->frame_control)) &&
+		    ieee80211_has_protected(hdr->frame_control)) {
+			skb_put(msdu, IEEE80211_CCMP_MIC_LEN);
+		} else if (!(skb_cb->flags & ATH10K_SKB_F_NO_HWCRYPT) &&
+			   txmode == ATH10K_HW_TXRX_RAW &&
+			   ieee80211_has_protected(hdr->frame_control)) {
+			skb_put(msdu, IEEE80211_CCMP_MIC_LEN);
+		}
 	}
 
 	skb_cb->paddr = dma_map_single(dev, msdu->data, msdu->len,
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index b73c23d4ce86..893296152c22 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -3386,12 +3386,16 @@ ath10k_mac_tx_h_get_txmode(struct ath10k *ar,
 			   struct sk_buff *skb)
 {
 	const struct ieee80211_hdr *hdr = (void *)skb->data;
+	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 	const struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
 	__le16 fc = hdr->frame_control;
 
 	if (!vif || vif->type == NL80211_IFTYPE_MONITOR)
 		return ATH10K_HW_TXRX_RAW;
 
+	if (tx_info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP)
+		return ATH10K_HW_TXRX_ETHERNET;
+
 	if (ieee80211_is_mgmt(fc))
 		return ATH10K_HW_TXRX_MGMT;
 
@@ -3544,6 +3548,15 @@ static void ath10k_mac_tx_h_fill_cb(struct ath10k *ar,
 			ieee80211_is_data_qos(hdr->frame_control);
 
 	cb->flags = 0;
+	cb->vif = vif;
+	cb->txq = txq;
+	cb->airtime_est = airtime;
+
+	if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) {
+		cb->flags |= ATH10K_SKB_F_HW_80211_ENCAP;
+		return;
+	}
+
 	if (!ath10k_tx_h_use_hwcrypto(vif, skb))
 		cb->flags |= ATH10K_SKB_F_NO_HWCRYPT;
 
@@ -3562,10 +3575,6 @@ static void ath10k_mac_tx_h_fill_cb(struct ath10k *ar,
 		cb->flags |= ATH10K_SKB_F_NO_HWCRYPT;
 		cb->flags |= ATH10K_SKB_F_RAW_TX;
 	}
-
-	cb->vif = vif;
-	cb->txq = txq;
-	cb->airtime_est = airtime;
 }
 
 bool ath10k_mac_tx_frm_has_freq(struct ath10k *ar)
@@ -3675,6 +3684,9 @@ static int ath10k_mac_tx(struct ath10k *ar,
 	const struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(skb);
 	int ret;
 
+	if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP)
+		goto skip_encap;
+
 	/* We should disable CCK RATE due to P2P */
 	if (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
 		ath10k_dbg(ar, ATH10K_DBG_MAC, "IEEE80211_TX_CTL_NO_CCK_RATE\n");
@@ -3698,6 +3710,7 @@ static int ath10k_mac_tx(struct ath10k *ar,
 		}
 	}
 
+skip_encap:
 	if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) {
 		if (!ath10k_mac_tx_frm_has_freq(ar)) {
 			ath10k_dbg(ar, ATH10K_DBG_MAC, "queued offchannel skb %pK\n",
@@ -3747,6 +3760,7 @@ void ath10k_offchan_tx_work(struct work_struct *work)
 	int ret;
 	unsigned long time_left;
 	bool tmp_peer_created = false;
+	struct ieee80211_tx_info *info;
 
 	/* FW requirement: We must create a peer before FW will send out
 	 * an offchannel frame. Otherwise the frame will be stuck and
@@ -3766,8 +3780,14 @@ void ath10k_offchan_tx_work(struct work_struct *work)
 		ath10k_dbg(ar, ATH10K_DBG_MAC, "mac offchannel skb %pK\n",
 			   skb);
 
-		hdr = (struct ieee80211_hdr *)skb->data;
-		peer_addr = ieee80211_get_DA(hdr);
+		info = IEEE80211_SKB_CB(skb);
+
+		if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) {
+			peer_addr = skb->data;
+		} else {
+			hdr = (struct ieee80211_hdr *)skb->data;
+			peer_addr = ieee80211_get_DA(hdr);
+		}
 
 		spin_lock_bh(&ar->data_lock);
 		vdev_id = ar->scan.vdev_id;
@@ -4295,7 +4315,7 @@ static void ath10k_mac_op_tx(struct ieee80211_hw *hw,
 	struct ieee80211_vif *vif = info->control.vif;
 	struct ieee80211_sta *sta = control->sta;
 	struct ieee80211_txq *txq = NULL;
-	struct ieee80211_hdr *hdr = (void *)skb->data;
+	struct ieee80211_hdr *hdr;
 	enum ath10k_hw_txrx_mode txmode;
 	enum ath10k_mac_tx_path txpath;
 	bool is_htt;
@@ -4326,14 +4346,20 @@ static void ath10k_mac_op_tx(struct ieee80211_hw *hw,
 			return;
 		}
 
-		ret = ath10k_htt_tx_mgmt_inc_pending(htt, is_mgmt, is_presp);
-		if (ret) {
-			ath10k_dbg(ar, ATH10K_DBG_MAC, "failed to increase tx mgmt pending count: %d, dropping\n",
-				   ret);
-			ath10k_htt_tx_dec_pending(htt);
-			spin_unlock_bh(&ar->htt.tx_lock);
-			ieee80211_free_txskb(ar->hw, skb);
-			return;
+		if (is_mgmt) {
+			hdr = (struct ieee80211_hdr *)skb->data;
+			is_presp = ieee80211_is_probe_resp(hdr->frame_control);
+
+			ret = ath10k_htt_tx_mgmt_inc_pending(htt, is_mgmt,
+							     is_presp);
+			if (ret) {
+				ath10k_dbg(ar, ATH10K_DBG_MAC, "failed to increase tx mgmt pending count: %d, dropping\n",
+					   ret);
+				ath10k_htt_tx_dec_pending(htt);
+				spin_unlock_bh(&ar->htt.tx_lock);
+				ieee80211_free_txskb(ar->hw, skb);
+				return;
+			}
 		}
 		spin_unlock_bh(&ar->htt.tx_lock);
 	}
@@ -5094,6 +5120,7 @@ static int ath10k_add_interface(struct ieee80211_hw *hw,
 	struct ath10k_vif *arvif = (void *)vif->drv_priv;
 	struct ath10k_peer *peer;
 	enum wmi_sta_powersave_param param;
+	int hw_encap = 0;
 	int ret = 0;
 	u32 value;
 	int bit;
@@ -5185,6 +5212,17 @@ static int ath10k_add_interface(struct ieee80211_hw *hw,
 		break;
 	}
 
+	switch (vif->type) {
+	case NL80211_IFTYPE_STATION:
+	case NL80211_IFTYPE_AP_VLAN:
+	case NL80211_IFTYPE_AP:
+		hw_encap = 1;
+		break;
+	default:
+		break;
+	}
+	ieee80211_set_hw_80211_encap(vif, ar->ethernetmode & hw_encap);
+
 	/* Using vdev_id as queue number will make it very easy to do per-vif
 	 * tx queue locking. This shouldn't wrap due to interface combinations
 	 * but do a modulo for correctness sake and prevent using offchannel tx
@@ -8602,6 +8640,8 @@ int ath10k_mac_register(struct ath10k *ar)
 	ieee80211_hw_set(ar->hw, QUEUE_CONTROL);
 	ieee80211_hw_set(ar->hw, SUPPORTS_TX_FRAG);
 	ieee80211_hw_set(ar->hw, REPORTS_LOW_ACK);
+	if (ar->ethernetmode)
+		ieee80211_hw_set(ar->hw, SUPPORTS_80211_ENCAP);
 
 	if (!test_bit(ATH10K_FLAG_RAW_MODE, &ar->dev_flags))
 		ieee80211_hw_set(ar->hw, SW_CRYPTO_CONTROL);
diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c
index c5818d28f55a..bad5e7335c0e 100644
--- a/drivers/net/wireless/ath/ath10k/txrx.c
+++ b/drivers/net/wireless/ath/ath10k/txrx.c
@@ -50,6 +50,8 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
 	struct ath10k_skb_cb *skb_cb;
 	struct ath10k_txq *artxq;
 	struct sk_buff *msdu;
+	struct ieee80211_vif *vif;
+	u8 flags;
 
 	ath10k_dbg(ar, ATH10K_DBG_HTT,
 		   "htt tx completion msdu_id %u status %d\n",
@@ -78,6 +80,9 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
 		artxq->num_fw_queued--;
 	}
 
+	flags = skb_cb->flags;
+	vif = skb_cb->vif;
+
 	ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
 	ath10k_htt_tx_dec_pending(htt);
 	if (htt->num_pending_tx == 0)
@@ -121,7 +126,11 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
 		info->status.is_valid_ack_signal = true;
 	}
 
-	ieee80211_tx_status(htt->ar->hw, msdu);
+	if (flags & ATH10K_SKB_F_HW_80211_ENCAP)
+		ieee80211_tx_status_8023(htt->ar->hw, vif, msdu);
+	else
+		ieee80211_tx_status(htt->ar->hw, msdu);
+
 	/* we do not own the msdu anymore */
 
 	return 0;
-- 
2.11.0

Re: [RFC V4 2/2] ath10k: add tx hw 802.11 encapusaltion offloading support

[Kalle Valo]

John Crispin <john@phrozen.org> writes:

> From: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
>
> This patch adds support for ethernet rxtx mode to the driver. The feature
> is enabled via a new module parameter. If enabled to driver will enable
> the feature on a per vif basis if all other requirements were met.
>
> Testing on a IPQ4019 based hardware shows a increase in TCP throughput
> of ~20% when the feature is enabled.
>
> Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
> Signed-off-by: John Crispin <john@phrozen.org>

Looks good to me.

BTW, for ath10k patches (patchsets including ath10k patches) please try
to CC also the ath10k list. Easier to find ath10k patches that way.

-- 
Kalle Valo

Re: [RFC V4 2/2] ath10k: add tx hw 802.11 encapusaltion offloading support

[John Crispin]

On 10/04/2019 17:31, Kalle Valo wrote:
> John Crispin <john@phrozen.org> writes:
>
>> From: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
>>
>> This patch adds support for ethernet rxtx mode to the driver. The feature
>> is enabled via a new module parameter. If enabled to driver will enable
>> the feature on a per vif basis if all other requirements were met.
>>
>> Testing on a IPQ4019 based hardware shows a increase in TCP throughput
>> of ~20% when the feature is enabled.
>>
>> Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
>> Signed-off-by: John Crispin <john@phrozen.org>
> Looks good to me.
>
> BTW, for ath10k patches (patchsets including ath10k patches) please try
> to CC also the ath10k list. Easier to find ath10k patches that way.
>
Hi,

Thanks Kalle, I'll be sending a V5 tomorrow with a small improvement on 
the hw crypto part, that unbreaks wpa3. can I add your Acked-by on the 
ath10k part ?

     John

Re: [RFC V4 2/2] ath10k: add tx hw 802.11 encapusaltion offloading support

[Kalle Valo]

John Crispin <john@phrozen.org> writes:

> On 10/04/2019 17:31, Kalle Valo wrote:
>> John Crispin <john@phrozen.org> writes:
>>
>>> From: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
>>>
>>> This patch adds support for ethernet rxtx mode to the driver. The feature
>>> is enabled via a new module parameter. If enabled to driver will enable
>>> the feature on a per vif basis if all other requirements were met.
>>>
>>> Testing on a IPQ4019 based hardware shows a increase in TCP throughput
>>> of ~20% when the feature is enabled.
>>>
>>> Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
>>> Signed-off-by: John Crispin <john@phrozen.org>
>> Looks good to me.
>>
>> BTW, for ath10k patches (patchsets including ath10k patches) please try
>> to CC also the ath10k list. Easier to find ath10k patches that way.
>>
> Hi,
>
> Thanks Kalle, I'll be sending a V5 tomorrow with a small improvement
> on the hw crypto part, that unbreaks wpa3. can I add your Acked-by on
> the ath10k part ?

Adding my Acked-by is not necessary as I will be applying the ath10k
patch anyway. In these cases we usually do so that Johannes applies the
mac80211 part, he then assigns the driver patches to me in patchwork,
and once mac80211 commits are in my tree, I'll apply the driver part.

-- 
Kalle Valo

Re: [RFC V4 1/2] mac80211: add hw 80211 encapsulation offloading support

[Johannes Berg]

On Wed, 2019-04-10 at 09:35 +0200, John Crispin wrote:
> The driver
> needs to enable the support on a per vif basis if it finds that all
> pre-reqs are meet.

> + * @IEEE80211_HW_SUPPORTS_80211_ENCAP: Hardware/driver supports 802.11
> + *	encap for data frames.

I'm still not sure I can reconcile these ... why do you need the latter
if the driver has to enable per vif anyway?

> +int ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable);

Add documentation please. Would be better to return bool too, to be
symmetric.

> +++ b/net/mac80211/cfg.c
> @@ -2379,6 +2379,9 @@ 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;

Why not do this like TKIP and disable encap?

> +int 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 (enable == sdata->hw_80211_encap)
> +		return enable;

It feels like this is missing some locking? Or at least a lock
assertion, if it's always called with a certain lock held already.

> +	if (!sdata->dev)
> +		return 0;
> +
> +	if (!ieee80211_hw_check(&local->hw, SUPPORTS_80211_ENCAP))
> +		enable = 0;
> +
> +	switch (vif->type) {
> +	case NL80211_IFTYPE_STATION:
> +		if (sdata->u.mgd.use_4addr)
> +			enable = 0;
> +		break;
> +	case NL80211_IFTYPE_AP_VLAN:
> +		if (sdata->wdev.use_4addr)
> +			enable = 0;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
> +	    (local->hw.wiphy->frag_threshold != (u32)-1))
> +		enable = 0;

Shouldn't there be some kind of TKIP check here?

> +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);

This might be better with RCU, though for proper usage you'd actually
have to call it with the mutex held, otherwise it can change while
you're iterating ...

> +	/* TKIP countermeasures wont work on encap offload mode */
> +	if (key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
> +		ieee80211_set_hw_80211_encap(&sdata->vif, 0);

false.

> @@ -197,6 +201,9 @@ 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;

Yeah, and this means you're also missing a "do we have a SW crypto key
right now" check above in ieee80211_set_hw_80211_encap().

> +	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);
> +	}

Ok, maybe this addresses my question above about why we need both -
though it's not really clear what happens if the driver actually does
want to still enable monitor mode - which certainly we (iwlwifi) would.

> +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);

no need for !! with bool :-)

> +	/* check for driver support and ieee80211 encap offload */
> +	if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) ||
> +	    sdata->hw_80211_encap)
>  		return;

That comment isn't very useful? :-)
 
> @@ -3573,6 +3576,9 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
>  		goto begin;
>  	}
>  
> +	if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP)
> +		goto encap_out;
> +
>  	if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
>  		info->flags |= IEEE80211_TX_CTL_AMPDU;

Wouldn't you still want this flag, perhaps?

Not with ath10k I guess, which offloads aggregation sessions, but still?
That's not necessarily a requirement for encap offload, is it?

> +	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)]++;
> +	}

This is something to think about, aren't we usually doing that after
encapsulation? So the counters will be off a bit now?

> +	if (WARN_ON(unlikely(!sdata->hw_80211_encap))) {

I feel I'm repeating myself - WARN_ON() includes unlikely().

johannes