ARM: Orion: Set eth packet size csum offload limit

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>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Cc: <stable@vger.kernel.org>

arch/arm/mach-dove/common.c

@@ -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);
 }
 
 /*****************************************************************************

arch/arm/mach-kirkwood/common.c

@@ -301,7 +301,7 @@ void __init kirkwood_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	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 mv643xx_eth_platform_data *eth_data)
 {
 	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);
 }
 

arch/arm/mach-mv78xx0/common.c

@@ -213,7 +213,8 @@ void __init mv78xx0_ge00_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	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 mv643xx_eth_platform_data *eth_data)
 {
 	orion_ge01_init(eth_data,
 			GE01_PHYS_BASE, IRQ_MV78XX0_GE01_SUM,
-			NO_IRQ);
+			NO_IRQ,
+			MV643XX_TX_CSUM_DEFAULT_LIMIT);
 }
 
 

arch/arm/mach-orion5x/common.c

@@ -109,7 +109,8 @@ void __init orion5x_eth_init(struct mv643xx_eth_platform_data *eth_data)
 {
 	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);
 }
 
 

arch/arm/plat-orion/common.c

@@ -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);

arch/arm/plat-orion/include/plat/common.h

@@ -39,12 +39,14 @@ void __init orion_rtc_init(unsigned long mapbase,
 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,

include/linux/mv643xx_eth.h

@@ -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;