qtnfmac: drop redundant data copy in control path

Command responses and events from the firmware are copied twice in
control path: at first in shm core (qtnf_shm_handle_new_data) and
then in pcie bus drivers (qtnf_pcie_control_rx_callback). There
is no need to copy this data twice, it can be done only once
in rx callbacks.
Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -242,7 +242,8 @@ static int qtnf_pcie_init_memory(struct qtnf_pcie_bus_priv *priv)
 	return 0;
 }
 
-static void qtnf_pcie_control_rx_callback(void *arg, const u8 *buf, size_t len)
+static void qtnf_pcie_control_rx_callback(void *arg, const u8 __iomem *buf,
+					  size_t len)
 {
 	struct qtnf_pcie_bus_priv *priv = arg;
 	struct qtnf_bus *bus = pci_get_drvdata(priv->pdev);
@@ -260,7 +261,7 @@ static void qtnf_pcie_control_rx_callback(void *arg, const u8 *buf, size_t len)
 		return;
 	}
 
-	skb_put_data(skb, buf, len);
+	memcpy_fromio(skb_put(skb, len), buf, len);
 
 	qtnf_trans_handle_rx_ctl_packet(bus, skb);
 }

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

@@ -42,19 +42,18 @@ static void qtnf_shm_handle_new_data(struct qtnf_shm_ipc *ipc)
 	if (unlikely(size == 0 || size > QTN_IPC_MAX_DATA_SZ)) {
 		pr_err("wrong rx packet size: %zu\n", size);
 		rx_buff_ok = false;
-	} else {
-		memcpy_fromio(ipc->rx_data, ipc->shm_region->data, size);
+	}
+
+	if (likely(rx_buff_ok)) {
+		ipc->rx_packet_count++;
+		ipc->rx_callback.fn(ipc->rx_callback.arg,
+				    ipc->shm_region->data, size);
 	}
 
 	writel(QTNF_SHM_IPC_ACK, &shm_reg_hdr->flags);
 	readl(&shm_reg_hdr->flags); /* flush PCIe write */
 
 	ipc->interrupt.fn(ipc->interrupt.arg);
-
-	if (likely(rx_buff_ok)) {
-		ipc->rx_packet_count++;
-		ipc->rx_callback.fn(ipc->rx_callback.arg, ipc->rx_data, size);
-	}
 }
 
 static void qtnf_shm_ipc_irq_work(struct work_struct *work)

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

@@ -32,7 +32,7 @@ struct qtnf_shm_ipc_int {
 };
 
 struct qtnf_shm_ipc_rx_callback {
-	void (*fn)(void *arg, const u8 *buf, size_t len);
+	void (*fn)(void *arg, const u8 __iomem *buf, size_t len);
 	void *arg;
 };
 
@@ -51,8 +51,6 @@ struct qtnf_shm_ipc {
 
 	u8 waiting_for_ack;
 
-	u8 rx_data[QTN_IPC_MAX_DATA_SZ] __aligned(sizeof(u32));
-
 	struct qtnf_shm_ipc_int interrupt;
 	struct qtnf_shm_ipc_rx_callback rx_callback;