qtnfmac: simplify firmware state tracking

This patch streamlines firmware state tracking. In particular, state
QTNF_FW_STATE_FW_DNLD_DONE is removed, states QTNF_FW_STATE_RESET and
QTNF_FW_STATE_DETACHED are merged into a single state. Besides, new
state QTNF_FW_STATE_RUNNING is introduced to distinguish between
the following two cases:
- firmware load succeeded, firmware init process is ongoing
- firmware init succeeded, firmware is fully functional

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -13,12 +13,11 @@
 #define QTNF_MAX_MAC		3
 
 enum qtnf_fw_state {
-	QTNF_FW_STATE_RESET,
-	QTNF_FW_STATE_FW_DNLD_DONE,
+	QTNF_FW_STATE_DETACHED,
 	QTNF_FW_STATE_BOOT_DONE,
 	QTNF_FW_STATE_ACTIVE,
-	QTNF_FW_STATE_DETACHED,
-	QTNF_FW_STATE_EP_DEAD,
+	QTNF_FW_STATE_RUNNING,
+	QTNF_FW_STATE_DEAD,
 };
 
 struct qtnf_bus;
@@ -58,6 +57,23 @@ struct qtnf_bus {
 	char bus_priv[0] __aligned(sizeof(void *));
 };
 
+static inline bool qtnf_fw_is_up(struct qtnf_bus *bus)
+{
+	enum qtnf_fw_state state = bus->fw_state;
+
+	return ((state == QTNF_FW_STATE_ACTIVE) ||
+		(state == QTNF_FW_STATE_RUNNING));
+}
+
+static inline bool qtnf_fw_is_attached(struct qtnf_bus *bus)
+{
+	enum qtnf_fw_state state = bus->fw_state;
+
+	return ((state == QTNF_FW_STATE_ACTIVE) ||
+		(state == QTNF_FW_STATE_RUNNING) ||
+		(state == QTNF_FW_STATE_DEAD));
+}
+
 static inline void *get_bus_priv(struct qtnf_bus *bus)
 {
 	if (WARN(!bus, "qtnfmac: invalid bus pointer"))

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

@@ -89,8 +89,7 @@ static int qtnf_cmd_send_with_reply(struct qtnf_bus *bus,
 
 	pr_debug("VIF%u.%u cmd=0x%.4X\n", mac_id, vif_id, cmd_id);
 
-	if (bus->fw_state != QTNF_FW_STATE_ACTIVE &&
-	    cmd_id != QLINK_CMD_FW_INIT) {
+	if (!qtnf_fw_is_up(bus) && cmd_id != QLINK_CMD_FW_INIT) {
 		pr_warn("VIF%u.%u: drop cmd 0x%.4X in fw state %d\n",
 			mac_id, vif_id, cmd_id, bus->fw_state);
 		dev_kfree_skb(cmd_skb);

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

@@ -589,8 +589,6 @@ int qtnf_core_attach(struct qtnf_bus *bus)
 	int ret;
 
 	qtnf_trans_init(bus);
-
-	bus->fw_state = QTNF_FW_STATE_BOOT_DONE;
 	qtnf_bus_data_rx_start(bus);
 
 	bus->workqueue = alloc_ordered_workqueue("QTNF_BUS", 0);
@@ -639,6 +637,7 @@ int qtnf_core_attach(struct qtnf_bus *bus)
 		}
 	}
 
+	bus->fw_state = QTNF_FW_STATE_RUNNING;
 	return 0;
 
 error:
@@ -657,7 +656,7 @@ void qtnf_core_detach(struct qtnf_bus *bus)
 	for (macid = 0; macid < QTNF_MAX_MAC; macid++)
 		qtnf_core_mac_detach(bus, macid);
 
-	if (bus->fw_state == QTNF_FW_STATE_ACTIVE)
+	if (qtnf_fw_is_up(bus))
 		qtnf_cmd_send_deinit_fw(bus);
 
 	bus->fw_state = QTNF_FW_STATE_DETACHED;
@@ -683,6 +682,9 @@ struct net_device *qtnf_classify_skb(struct qtnf_bus *bus, struct sk_buff *skb)
 	struct qtnf_wmac *mac;
 	struct qtnf_vif *vif;
 
+	if (unlikely(bus->fw_state != QTNF_FW_STATE_RUNNING))
+		return NULL;
+
 	meta = (struct qtnf_frame_meta_info *)
 		(skb_tail_pointer(skb) - sizeof(*meta));
 

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

@@ -56,7 +56,7 @@ int qtnf_pcie_control_tx(struct qtnf_bus *bus, struct sk_buff *skb)
 
 	if (ret == -ETIMEDOUT) {
 		pr_err("EP firmware is dead\n");
-		bus->fw_state = QTNF_FW_STATE_EP_DEAD;
+		bus->fw_state = QTNF_FW_STATE_DEAD;
 	}
 
 	return ret;
@@ -132,11 +132,10 @@ int qtnf_pcie_fw_boot_done(struct qtnf_bus *bus)
 {
 	int ret;
 
-	bus->fw_state = QTNF_FW_STATE_FW_DNLD_DONE;
+	bus->fw_state = QTNF_FW_STATE_BOOT_DONE;
 	ret = qtnf_core_attach(bus);
 	if (ret) {
 		pr_err("failed to attach core\n");
-		bus->fw_state = QTNF_FW_STATE_DETACHED;
 	} else {
 		qtnf_debugfs_init(bus, DRV_NAME);
 		qtnf_debugfs_add_entry(bus, "mps", qtnf_dbg_mps_show);
@@ -335,7 +334,7 @@ static int qtnf_pcie_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	pcie_priv = get_bus_priv(bus);
 	pci_set_drvdata(pdev, bus);
 	bus->dev = &pdev->dev;
-	bus->fw_state = QTNF_FW_STATE_RESET;
+	bus->fw_state = QTNF_FW_STATE_DETACHED;
 	pcie_priv->pdev = pdev;
 	pcie_priv->tx_stopped = 0;
 	pcie_priv->rx_bd_num = rx_bd_size_param;
@@ -410,8 +409,7 @@ static void qtnf_pcie_remove(struct pci_dev *dev)
 
 	cancel_work_sync(&bus->fw_work);
 
-	if (bus->fw_state == QTNF_FW_STATE_ACTIVE ||
-	    bus->fw_state == QTNF_FW_STATE_EP_DEAD)
+	if (qtnf_fw_is_attached(bus))
 		qtnf_core_detach(bus);
 
 	netif_napi_del(&bus->mux_napi);