[PATCH] e1000: Added disable packet split capability

Adds the ability to disability packet split at compile time and use the legacy receive path on PCI express hardware.  Made this a CONFIG option and modified the Kconfig, to reflect the new option.
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

arch/arm/configs/ep80219_defconfig

@@ -522,6 +522,7 @@ CONFIG_E100=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 CONFIG_E1000_NAPI=y
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/arm/configs/iq31244_defconfig

@@ -493,6 +493,7 @@ CONFIG_NETDEVICES=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 CONFIG_E1000_NAPI=y
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/arm/configs/iq80321_defconfig

@@ -415,6 +415,7 @@ CONFIG_NETDEVICES=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 CONFIG_E1000_NAPI=y
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/arm/configs/iq80331_defconfig

@@ -496,6 +496,7 @@ CONFIG_NETDEVICES=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 CONFIG_E1000_NAPI=y
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/arm/configs/iq80332_defconfig

@@ -496,6 +496,7 @@ CONFIG_NETDEVICES=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 CONFIG_E1000_NAPI=y
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/i386/defconfig

@@ -644,6 +644,8 @@ CONFIG_8139TOO_PIO=y
 # CONFIG_ACENIC is not set
 # CONFIG_DL2K is not set
 # CONFIG_E1000 is not set
+# CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/ia64/configs/gensparse_defconfig

@@ -557,6 +557,7 @@ CONFIG_E100=m
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/ia64/configs/tiger_defconfig

@@ -565,6 +565,7 @@ CONFIG_E100=m
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/ia64/configs/zx1_defconfig

@@ -548,6 +548,7 @@ CONFIG_E100=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/ia64/defconfig

@@ -565,6 +565,7 @@ CONFIG_E100=m
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/parisc/configs/a500_defconfig

@@ -602,6 +602,7 @@ CONFIG_ACENIC_OMIT_TIGON_I=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=m
 CONFIG_E1000_NAPI=y
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/parisc/configs/c3000_defconfig

@@ -626,6 +626,7 @@ CONFIG_ACENIC=m
 # CONFIG_DL2K is not set
 CONFIG_E1000=m
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/powerpc/configs/cell_defconfig

@@ -533,6 +533,7 @@ CONFIG_MII=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=m
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/powerpc/configs/g5_defconfig

@@ -675,6 +675,7 @@ CONFIG_ACENIC_OMIT_TIGON_I=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/powerpc/configs/iseries_defconfig

@@ -567,6 +567,7 @@ CONFIG_ACENIC=m
 # CONFIG_DL2K is not set
 CONFIG_E1000=m
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/powerpc/configs/maple_defconfig

@@ -454,6 +454,7 @@ CONFIG_AMD8111_ETH=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/powerpc/configs/ppc64_defconfig

@@ -724,6 +724,7 @@ CONFIG_ACENIC_OMIT_TIGON_I=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/powerpc/configs/pseries_defconfig

@@ -671,6 +671,7 @@ CONFIG_ACENIC_OMIT_TIGON_I=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/ppc/configs/bamboo_defconfig

@@ -499,6 +499,7 @@ CONFIG_NATSEMI=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/ppc/configs/katana_defconfig

@@ -488,6 +488,7 @@ CONFIG_E100=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/ppc/configs/mpc834x_sys_defconfig

@@ -402,6 +402,7 @@ CONFIG_E100=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/ppc/configs/power3_defconfig

@@ -442,6 +442,7 @@ CONFIG_E100=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

arch/sparc64/defconfig

@@ -529,6 +529,7 @@ CONFIG_NET_PCI=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=m
 CONFIG_E1000_NAPI=y
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_MYRI_SBUS is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set

arch/x86_64/defconfig

@@ -646,6 +646,7 @@ CONFIG_8139TOO=y
 # CONFIG_DL2K is not set
 CONFIG_E1000=y
 # CONFIG_E1000_NAPI is not set
+# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
 # CONFIG_NS83820 is not set
 # CONFIG_HAMACHI is not set
 # CONFIG_YELLOWFIN is not set

drivers/net/Kconfig

@@ -1914,6 +1914,15 @@ config E1000_NAPI
 
 	  If in doubt, say N.
 
+config E1000_DISABLE_PACKET_SPLIT
+	bool "Disable Packet Split for PCI express adapters"
+	depends on E1000
+	help
+	  Say Y here if you want to use the legacy receive path for PCI express
+	  hadware.
+
+	  If in doubt, say N.
+
 source "drivers/net/ixp2000/Kconfig"
 
 config MYRI_SBUS

drivers/net/e1000/e1000_main.c

@@ -1621,7 +1621,7 @@ e1000_setup_rctl(struct e1000_adapter *adapter)
 {
 	uint32_t rctl, rfctl;
 	uint32_t psrctl = 0;
-#ifdef CONFIG_E1000_PACKET_SPLIT
+#ifndef CONFIG_E1000_DISABLE_PACKET_SPLIT
 	uint32_t pages = 0;
 #endif
 
@@ -1672,7 +1672,7 @@ e1000_setup_rctl(struct e1000_adapter *adapter)
 		}
 	}
 
-#ifdef CONFIG_E1000_PACKET_SPLIT
+#ifndef CONFIG_E1000_DISABLE_PACKET_SPLIT
 	/* 82571 and greater support packet-split where the protocol
 	 * header is placed in skb->data and the packet data is
 	 * placed in pages hanging off of skb_shinfo(skb)->nr_frags.