linux-kernel - [PATCH net-next 1/2] r8152: add CONFIG_RTL8152_EARLY_AGG

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Message-ID: <1394628023-12713-1-git-send-email-hayeswang@realtek.com>
Date:	Wed, 12 Mar 2014 20:39:58 +0800
From:	Hayes Wang <hayeswang@...ltek.com>
To:	<netdev@...r.kernel.org>
CC:	<nic_swsd@...ltek.com>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: [PATCH net-next 1/2] r8152: add CONFIG_RTL8152_EARLY_AGG_SUPER

For slow CPU, the frequent bulk transfer would cause poor throughput.
One solution is to increase the timeout of the aggregation. It let
the hw could complete the bulk transfer later and fill more packets
into the buffer. Besides, it could reduce the frequency of the bulk
transfer efficiently and improve the performance.

However, the optimization value of the timeout depends on the
capability of the hardware, especially the CPU. For example, according
to the experiment, the value 0x0e835000 is better than the default
value for the chromebook with the ARM CPU.

Now add CONFIG_RTL8152_EARLY_AGG_SUPER to let someone could choose
desired timeout value if he wants to get the best performance.

Signed-off-by: Hayes Wang <hayeswang@...ltek.com>
---
 drivers/net/usb/Kconfig | 11 +++++++++++
 drivers/net/usb/r8152.c |  4 ++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/Kconfig b/drivers/net/usb/Kconfig
index 7e7269f..be6e21d 100644
--- a/drivers/net/usb/Kconfig
+++ b/drivers/net/usb/Kconfig
@@ -102,6 +102,17 @@ config USB_RTL8152
 	  To compile this driver as a module, choose M here: the
 	  module will be called r8152.
 
+	menu "Aggregation Settings"
+		depends on USB_RTL8152
+
+	config RTL8152_EARLY_AGG_SUPER
+		hex "rx early agg parameter for super speed"
+		default 0x0e832981
+		help
+		  This is the rx early agg parameter for USB super speed.
+
+	endmenu
+
 config USB_USBNET
 	tristate "Multi-purpose USB Networking Framework"
 	select MII
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index aa1d5b2..0c43b28 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -316,7 +316,7 @@
 #define PCUT_STATUS		0x0001
 
 /* USB_RX_EARLY_AGG */
-#define EARLY_AGG_SUPPER	0x0e832981
+/* CONFIG_RTL8152_EARLY_AGG_SUPER default is 0x0e832981 */
 #define EARLY_AGG_HIGH		0x0e837a12
 #define EARLY_AGG_SLOW		0x0e83ffff
 
@@ -1978,7 +1978,7 @@ static void r8153_set_rx_agg(struct r8152 *tp)
 			ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_BUF_TH,
 					RX_THR_SUPPER);
 			ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_EARLY_AGG,
-					EARLY_AGG_SUPPER);
+					CONFIG_RTL8152_EARLY_AGG_SUPER);
 		} else {
 			ocp_write_dword(tp, MCU_TYPE_USB, USB_RX_BUF_TH,
 					RX_THR_HIGH);
-- 
1.8.4.2

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