The mv643xx ethernet controller limits the packet size for the TX
checksum offloading. This patch sets this limits for Kirkwood and
Dove which have smaller limits that the default.

As a side note, this patch is an updated version of a patch sent some years
ago: http://lists.infradead.org/pipermail/linux-arm-kernel/2010-June/017320.html
which seems to have been lost.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>

Index: alunn/arch/arm/mach-dove/common.c
===================================================================
--- alunn.orig/arch/arm/mach-dove/common.c	2012-07-26 12:04:52.433913851 +0200
+++ alunn/arch/arm/mach-dove/common.c	2012-07-26 12:05:11.321913026 +0200
@@ -102,7 +102,8 @@ void __init dove_ehci1_init(void)
 void __init dove_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge00_init(eth_data, DOVE_GE00_PHYS_BASE,
-			IRQ_DOVE_GE00_SUM, IRQ_DOVE_GE00_ERR);
+			IRQ_DOVE_GE00_SUM, IRQ_DOVE_GE00_ERR,
+			1600);
 }
 
 /*****************************************************************************
Index: alunn/arch/arm/mach-kirkwood/common.c
===================================================================
--- alunn.orig/arch/arm/mach-kirkwood/common.c	2012-07-26 12:04:52.433913851 +0200
+++ alunn/arch/arm/mach-kirkwood/common.c	2012-07-26 12:05:11.341913018 +0200
@@ -301,7 +301,7 @@ void __init kirkwood_ge00_init(struct mv
 {
 	orion_ge00_init(eth_data,
 			GE00_PHYS_BASE, IRQ_KIRKWOOD_GE00_SUM,
-			IRQ_KIRKWOOD_GE00_ERR);
+			IRQ_KIRKWOOD_GE00_ERR, 1600);
 	/* The interface forgets the MAC address assigned by u-boot if
 	the clock is turned off, so claim the clk now. */
 	clk_prepare_enable(ge0);
@@ -315,7 +315,7 @@ void __init kirkwood_ge01_init(struct mv
 {
 	orion_ge01_init(eth_data,
 			GE01_PHYS_BASE, IRQ_KIRKWOOD_GE01_SUM,
-			IRQ_KIRKWOOD_GE01_ERR);
+			IRQ_KIRKWOOD_GE01_ERR, 1600);
 	clk_prepare_enable(ge1);
 }
 
Index: alunn/arch/arm/mach-mv78xx0/common.c
===================================================================
--- alunn.orig/arch/arm/mach-mv78xx0/common.c	2012-07-26 12:04:52.433913851 +0200
+++ alunn/arch/arm/mach-mv78xx0/common.c	2012-07-26 12:05:11.365913016 +0200
@@ -213,7 +213,8 @@ void __init mv78xx0_ge00_init(struct mv6
 {
 	orion_ge00_init(eth_data,
 			GE00_PHYS_BASE, IRQ_MV78XX0_GE00_SUM,
-			IRQ_MV78XX0_GE_ERR);
+			IRQ_MV78XX0_GE_ERR,
+			MV643XX_TX_CSUM_DEFAULT_LIMIT);
 }
 
 
@@ -224,7 +225,8 @@ void __init mv78xx0_ge01_init(struct mv6
 {
 	orion_ge01_init(eth_data,
 			GE01_PHYS_BASE, IRQ_MV78XX0_GE01_SUM,
-			NO_IRQ);
+			NO_IRQ,
+			MV643XX_TX_CSUM_DEFAULT_LIMIT);
 }
 
 
Index: alunn/arch/arm/mach-orion5x/common.c
===================================================================
--- alunn.orig/arch/arm/mach-orion5x/common.c	2012-07-26 12:04:52.433913851 +0200
+++ alunn/arch/arm/mach-orion5x/common.c	2012-07-26 12:05:11.365913016 +0200
@@ -109,7 +109,8 @@ void __init orion5x_eth_init(struct mv64
 {
 	orion_ge00_init(eth_data,
 			ORION5X_ETH_PHYS_BASE, IRQ_ORION5X_ETH_SUM,
-			IRQ_ORION5X_ETH_ERR);
+			IRQ_ORION5X_ETH_ERR,
+			MV643XX_TX_CSUM_DEFAULT_LIMIT);
 }
 
 
Index: alunn/arch/arm/plat-orion/common.c
===================================================================
--- alunn.orig/arch/arm/plat-orion/common.c	2012-07-26 12:04:52.433913851 +0200
+++ alunn/arch/arm/plat-orion/common.c	2012-07-26 12:05:11.369913016 +0200
@@ -291,10 +291,12 @@ static struct platform_device orion_ge00
 void __init orion_ge00_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err)
+			    unsigned long irq_err,
+			    unsigned int tx_csum_limit)
 {
 	fill_resources(&orion_ge00_shared, orion_ge00_shared_resources,
 		       mapbase + 0x2000, SZ_16K - 1, irq_err);
+	orion_ge00_shared_data.tx_csum_limit = tx_csum_limit;
 	ge_complete(&orion_ge00_shared_data,
 		    orion_ge00_resources, irq, &orion_ge00_shared,
 		    eth_data, &orion_ge00);
@@ -343,10 +345,12 @@ static struct platform_device orion_ge01
 void __init orion_ge01_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err)
+			    unsigned long irq_err,
+			    unsigned int tx_csum_limit)
 {
 	fill_resources(&orion_ge01_shared, orion_ge01_shared_resources,
 		       mapbase + 0x2000, SZ_16K - 1, irq_err);
+	orion_ge01_shared_data.tx_csum_limit = tx_csum_limit;
 	ge_complete(&orion_ge01_shared_data,
 		    orion_ge01_resources, irq, &orion_ge01_shared,
 		    eth_data, &orion_ge01);
Index: alunn/arch/arm/plat-orion/include/plat/common.h
===================================================================
--- alunn.orig/arch/arm/plat-orion/include/plat/common.h	2012-07-26 12:04:52.433913851 +0200
+++ alunn/arch/arm/plat-orion/include/plat/common.h	2012-07-26 12:05:11.369913016 +0200
@@ -39,12 +39,14 @@ void __init orion_rtc_init(unsigned long
 void __init orion_ge00_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err);
+			    unsigned long irq_err,
+			    unsigned int tx_csum_limit);
 
 void __init orion_ge01_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
 			    unsigned long irq,
-			    unsigned long irq_err);
+			    unsigned long irq_err,
+			    unsigned int tx_csum_limit);
 
 void __init orion_ge10_init(struct mv643xx_eth_platform_data *eth_data,
 			    unsigned long mapbase,
Index: alunn/include/linux/mv643xx_eth.h
===================================================================
--- alunn.orig/include/linux/mv643xx_eth.h	2012-07-26 12:04:52.433913851 +0200
+++ alunn/include/linux/mv643xx_eth.h	2012-07-26 12:05:11.369913016 +0200
@@ -15,6 +15,8 @@
 #define MV643XX_ETH_SIZE_REG_4		0x2224
 #define MV643XX_ETH_BASE_ADDR_ENABLE_REG	0x2290
 
+#define MV643XX_TX_CSUM_DEFAULT_LIMIT	0
+
 struct mv643xx_eth_shared_platform_data {
 	struct mbus_dram_target_info	*dram;
 	struct platform_device	*shared_smi;