qtnfmac: send EAPOL frames via control path

Use control path to send EAPOL frames to make sure they are
sent with higher priority with aggregation disabled.
Signed-off-by: Igor Mitsyanko <igor.mitsyanko.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/quantenna/qtnfmac/bus.h

@@ -49,6 +49,7 @@ struct qtnf_bus {
 	struct napi_struct mux_napi;
 	struct net_device mux_dev;
 	struct workqueue_struct *workqueue;
+	struct workqueue_struct *hprio_workqueue;
 	struct work_struct fw_work;
 	struct work_struct event_work;
 	struct mutex bus_lock; /* lock during command/event processing */

drivers/net/wireless/quantenna/qtnfmac/cfg80211.c

@@ -144,6 +144,7 @@ int qtnf_del_virtual_intf(struct wiphy *wiphy, struct wireless_dev *wdev)
 {
 	struct net_device *netdev =  wdev->netdev;
 	struct qtnf_vif *vif;
+	struct sk_buff *skb;
 
 	if (WARN_ON(!netdev))
 		return -EFAULT;
@@ -157,6 +158,11 @@ int qtnf_del_virtual_intf(struct wiphy *wiphy, struct wireless_dev *wdev)
 	if (netif_carrier_ok(netdev))
 		netif_carrier_off(netdev);
 
+	while ((skb = skb_dequeue(&vif->high_pri_tx_queue)))
+		dev_kfree_skb_any(skb);
+
+	cancel_work_sync(&vif->high_pri_tx_work);
+
 	if (netdev->reg_state == NETREG_REGISTERED)
 		unregister_netdevice(netdev);
 
@@ -424,13 +430,13 @@ qtnf_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 	*cookie = short_cookie;
 
 	if (params->offchan)
-		flags |= QLINK_MGMT_FRAME_TX_FLAG_OFFCHAN;
+		flags |= QLINK_FRAME_TX_FLAG_OFFCHAN;
 
 	if (params->no_cck)
-		flags |= QLINK_MGMT_FRAME_TX_FLAG_NO_CCK;
+		flags |= QLINK_FRAME_TX_FLAG_NO_CCK;
 
 	if (params->dont_wait_for_ack)
-		flags |= QLINK_MGMT_FRAME_TX_FLAG_ACK_NOWAIT;
+		flags |= QLINK_FRAME_TX_FLAG_ACK_NOWAIT;
 
 	/* If channel is not specified, pass "freq = 0" to tell device
 	 * firmware to use current channel.
@@ -445,9 +451,8 @@ qtnf_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 		 le16_to_cpu(mgmt_frame->frame_control), mgmt_frame->da,
 		 params->len, short_cookie, flags);
 
-	return qtnf_cmd_send_mgmt_frame(vif, short_cookie, flags,
-					freq,
-					params->buf, params->len);
+	return qtnf_cmd_send_frame(vif, short_cookie, flags,
+				   freq, params->buf, params->len);
 }
 
 static int

drivers/net/wireless/quantenna/qtnfmac/commands.c

@@ -381,11 +381,11 @@ int qtnf_cmd_send_register_mgmt(struct qtnf_vif *vif, u16 frame_type, bool reg)
 	return ret;
 }
 
-int qtnf_cmd_send_mgmt_frame(struct qtnf_vif *vif, u32 cookie, u16 flags,
-			     u16 freq, const u8 *buf, size_t len)
+int qtnf_cmd_send_frame(struct qtnf_vif *vif, u32 cookie, u16 flags,
+			u16 freq, const u8 *buf, size_t len)
 {
 	struct sk_buff *cmd_skb;
-	struct qlink_cmd_mgmt_frame_tx *cmd;
+	struct qlink_cmd_frame_tx *cmd;
 	int ret;
 
 	if (sizeof(*cmd) + len > QTNF_MAX_CMD_BUF_SIZE) {
@@ -395,14 +395,14 @@ int qtnf_cmd_send_mgmt_frame(struct qtnf_vif *vif, u32 cookie, u16 flags,
 	}
 
 	cmd_skb = qtnf_cmd_alloc_new_cmdskb(vif->mac->macid, vif->vifid,
-					    QLINK_CMD_SEND_MGMT_FRAME,
+					    QLINK_CMD_SEND_FRAME,
 					    sizeof(*cmd));
 	if (!cmd_skb)
 		return -ENOMEM;
 
 	qtnf_bus_lock(vif->mac->bus);
 
-	cmd = (struct qlink_cmd_mgmt_frame_tx *)cmd_skb->data;
+	cmd = (struct qlink_cmd_frame_tx *)cmd_skb->data;
 	cmd->cookie = cpu_to_le32(cookie);
 	cmd->freq = cpu_to_le16(freq);
 	cmd->flags = cpu_to_le16(flags);

drivers/net/wireless/quantenna/qtnfmac/commands.h

@@ -27,8 +27,8 @@ int qtnf_cmd_send_start_ap(struct qtnf_vif *vif,
 			   const struct cfg80211_ap_settings *s);
 int qtnf_cmd_send_stop_ap(struct qtnf_vif *vif);
 int qtnf_cmd_send_register_mgmt(struct qtnf_vif *vif, u16 frame_type, bool reg);
-int qtnf_cmd_send_mgmt_frame(struct qtnf_vif *vif, u32 cookie, u16 flags,
-			     u16 freq, const u8 *buf, size_t len);
+int qtnf_cmd_send_frame(struct qtnf_vif *vif, u32 cookie, u16 flags,
+			u16 freq, const u8 *buf, size_t len);
 int qtnf_cmd_send_mgmt_set_appie(struct qtnf_vif *vif, u8 frame_type,
 				 const u8 *buf, size_t len);
 int qtnf_cmd_get_sta_info(struct qtnf_vif *vif, const u8 *sta_mac,

drivers/net/wireless/quantenna/qtnfmac/core.c

@@ -368,6 +368,23 @@ static void qtnf_mac_scan_timeout(struct work_struct *work)
 	qtnf_mac_scan_finish(mac, true);
 }
 
+static void qtnf_vif_send_data_high_pri(struct work_struct *work)
+{
+	struct qtnf_vif *vif =
+		container_of(work, struct qtnf_vif, high_pri_tx_work);
+	struct sk_buff *skb;
+
+	if (!vif->netdev ||
+	    vif->wdev.iftype == NL80211_IFTYPE_UNSPECIFIED)
+		return;
+
+	while ((skb = skb_dequeue(&vif->high_pri_tx_queue))) {
+		qtnf_cmd_send_frame(vif, 0, QLINK_FRAME_TX_FLAG_8023,
+				    0, skb->data, skb->len);
+		dev_kfree_skb_any(skb);
+	}
+}
+
 static struct qtnf_wmac *qtnf_core_mac_alloc(struct qtnf_bus *bus,
 					     unsigned int macid)
 {
@@ -395,7 +412,8 @@ static struct qtnf_wmac *qtnf_core_mac_alloc(struct qtnf_bus *bus,
 		vif->mac = mac;
 		vif->vifid = i;
 		qtnf_sta_list_init(&vif->sta_list);
-
+		INIT_WORK(&vif->high_pri_tx_work, qtnf_vif_send_data_high_pri);
+		skb_queue_head_init(&vif->high_pri_tx_queue);
 		vif->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 		if (!vif->stats64)
 			pr_warn("VIF%u.%u: per cpu stats allocation failed\n",
@@ -598,6 +616,13 @@ int qtnf_core_attach(struct qtnf_bus *bus)
 		goto error;
 	}
 
+	bus->hprio_workqueue = alloc_workqueue("QTNF_HPRI", WQ_HIGHPRI, 0);
+	if (!bus->hprio_workqueue) {
+		pr_err("failed to alloc high prio workqueue\n");
+		ret = -ENOMEM;
+		goto error;
+	}
+
 	INIT_WORK(&bus->event_work, qtnf_event_work_handler);
 
 	ret = qtnf_cmd_send_init_fw(bus);
@@ -607,7 +632,6 @@ int qtnf_core_attach(struct qtnf_bus *bus)
 	}
 
 	bus->fw_state = QTNF_FW_STATE_ACTIVE;
-
 	ret = qtnf_cmd_get_hw_info(bus);
 	if (ret) {
 		pr_err("failed to get HW info: %d\n", ret);
@@ -642,7 +666,6 @@ int qtnf_core_attach(struct qtnf_bus *bus)
 
 error:
 	qtnf_core_detach(bus);
-
 	return ret;
 }
 EXPORT_SYMBOL_GPL(qtnf_core_attach);
@@ -664,6 +687,13 @@ void qtnf_core_detach(struct qtnf_bus *bus)
 	if (bus->workqueue) {
 		flush_workqueue(bus->workqueue);
 		destroy_workqueue(bus->workqueue);
+		bus->workqueue = NULL;
+	}
+
+	if (bus->hprio_workqueue) {
+		flush_workqueue(bus->hprio_workqueue);
+		destroy_workqueue(bus->hprio_workqueue);
+		bus->hprio_workqueue = NULL;
 	}
 
 	qtnf_trans_free(bus);
@@ -800,6 +830,15 @@ void qtnf_update_tx_stats(struct net_device *ndev, const struct sk_buff *skb)
 }
 EXPORT_SYMBOL_GPL(qtnf_update_tx_stats);
 
+void qtnf_packet_send_hi_pri(struct sk_buff *skb)
+{
+	struct qtnf_vif *vif = qtnf_netdev_get_priv(skb->dev);
+
+	skb_queue_tail(&vif->high_pri_tx_queue, skb);
+	queue_work(vif->mac->bus->hprio_workqueue, &vif->high_pri_tx_work);
+}
+EXPORT_SYMBOL_GPL(qtnf_packet_send_hi_pri);
+
 MODULE_AUTHOR("Quantenna Communications");
 MODULE_DESCRIPTION("Quantenna 802.11 wireless LAN FullMAC driver.");
 MODULE_LICENSE("GPL");

drivers/net/wireless/quantenna/qtnfmac/core.h

@@ -63,6 +63,8 @@ struct qtnf_vif {
 	struct qtnf_wmac *mac;
 
 	struct work_struct reset_work;
+	struct work_struct high_pri_tx_work;
+	struct sk_buff_head high_pri_tx_queue;
 	struct qtnf_sta_list sta_list;
 	unsigned long cons_tx_timeout_cnt;
 	int generation;
@@ -149,6 +151,7 @@ void qtnf_virtual_intf_cleanup(struct net_device *ndev);
 
 void qtnf_netdev_updown(struct net_device *ndev, bool up);
 void qtnf_scan_done(struct qtnf_wmac *mac, bool aborted);
+void qtnf_packet_send_hi_pri(struct sk_buff *skb);
 
 static inline struct qtnf_vif *qtnf_netdev_get_priv(struct net_device *dev)
 {

drivers/net/wireless/quantenna/qtnfmac/pcie/pcie.c

@@ -354,6 +354,7 @@ static int qtnf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	pcie_priv->pcie_irq_count = 0;
 	pcie_priv->tx_reclaim_done = 0;
 	pcie_priv->tx_reclaim_req = 0;
+	pcie_priv->tx_eapol = 0;
 
 	pcie_priv->workqueue = create_singlethread_workqueue("QTNF_PCIE");
 	if (!pcie_priv->workqueue) {

drivers/net/wireless/quantenna/qtnfmac/pcie/pcie_priv.h

@@ -62,6 +62,7 @@ struct qtnf_pcie_bus_priv {
 	u32 tx_done_count;
 	u32 tx_reclaim_done;
 	u32 tx_reclaim_req;
+	u32 tx_eapol;
 
 	u8 msi_enabled;
 	u8 tx_stopped;

drivers/net/wireless/quantenna/qtnfmac/pcie/topaz_pcie.c

@@ -498,6 +498,13 @@ static int qtnf_pcie_data_tx(struct qtnf_bus *bus, struct sk_buff *skb)
 	int len;
 	int i;
 
+	if (unlikely(skb->protocol == htons(ETH_P_PAE))) {
+		qtnf_packet_send_hi_pri(skb);
+		qtnf_update_tx_stats(skb->dev, skb);
+		priv->tx_eapol++;
+		return NETDEV_TX_OK;
+	}
+
 	spin_lock_irqsave(&priv->tx_lock, flags);
 
 	if (!qtnf_tx_queue_ready(ts)) {
@@ -761,6 +768,7 @@ static int qtnf_dbg_pkt_stats(struct seq_file *s, void *data)
 	seq_printf(s, "tx_done_count(%u)\n", priv->tx_done_count);
 	seq_printf(s, "tx_reclaim_done(%u)\n", priv->tx_reclaim_done);
 	seq_printf(s, "tx_reclaim_req(%u)\n", priv->tx_reclaim_req);
+	seq_printf(s, "tx_eapol(%u)\n", priv->tx_eapol);
 
 	seq_printf(s, "tx_bd_r_index(%u)\n", priv->tx_bd_r_index);
 	seq_printf(s, "tx_done_index(%u)\n", tx_done_index);

drivers/net/wireless/quantenna/qtnfmac/qlink.h

@@ -206,6 +206,8 @@ struct qlink_sta_info_state {
  * execution status (one of &enum qlink_cmd_result). Reply message
  * may also contain data payload specific to the command type.
  *
+ * @QLINK_CMD_SEND_FRAME: send specified frame over the air; firmware will
+ *	encapsulate 802.3 packet into 802.11 frame automatically.
  * @QLINK_CMD_BAND_INFO_GET: for the specified MAC and specified band, get
  *	the band's description including number of operational channels and
  *	info on each channel, HT/VHT capabilities, supported rates etc.
@@ -220,7 +222,7 @@ enum qlink_cmd_type {
 	QLINK_CMD_FW_INIT		= 0x0001,
 	QLINK_CMD_FW_DEINIT		= 0x0002,
 	QLINK_CMD_REGISTER_MGMT		= 0x0003,
-	QLINK_CMD_SEND_MGMT_FRAME	= 0x0004,
+	QLINK_CMD_SEND_FRAME		= 0x0004,
 	QLINK_CMD_MGMT_SET_APPIE	= 0x0005,
 	QLINK_CMD_PHY_PARAMS_GET	= 0x0011,
 	QLINK_CMD_PHY_PARAMS_SET	= 0x0012,
@@ -321,22 +323,26 @@ struct qlink_cmd_mgmt_frame_register {
 	u8 do_register;
 } __packed;
 
-enum qlink_mgmt_frame_tx_flags {
-	QLINK_MGMT_FRAME_TX_FLAG_NONE		= 0,
-	QLINK_MGMT_FRAME_TX_FLAG_OFFCHAN	= BIT(0),
-	QLINK_MGMT_FRAME_TX_FLAG_NO_CCK		= BIT(1),
-	QLINK_MGMT_FRAME_TX_FLAG_ACK_NOWAIT	= BIT(2),
+/**
+ * @QLINK_FRAME_TX_FLAG_8023: frame has a 802.3 header; if not set, frame
+ *	is a 802.11 encapsulated.
+ */
+enum qlink_frame_tx_flags {
+	QLINK_FRAME_TX_FLAG_OFFCHAN	= BIT(0),
+	QLINK_FRAME_TX_FLAG_NO_CCK	= BIT(1),
+	QLINK_FRAME_TX_FLAG_ACK_NOWAIT	= BIT(2),
+	QLINK_FRAME_TX_FLAG_8023	= BIT(3),
 };
 
 /**
- * struct qlink_cmd_mgmt_frame_tx - data for QLINK_CMD_SEND_MGMT_FRAME command
+ * struct qlink_cmd_frame_tx - data for QLINK_CMD_SEND_FRAME command
  *
  * @cookie: opaque request identifier.
  * @freq: Frequency to use for frame transmission.
- * @flags: Transmission flags, one of &enum qlink_mgmt_frame_tx_flags.
+ * @flags: Transmission flags, one of &enum qlink_frame_tx_flags.
  * @frame_data: frame to transmit.
  */
-struct qlink_cmd_mgmt_frame_tx {
+struct qlink_cmd_frame_tx {
 	struct qlink_cmd chdr;
 	__le32 cookie;
 	__le16 freq;