net:add one common config ARCH_WANT_RELAX_ORDER to support relax ordering

Relax ordering(RO) is one feature of 82599 NIC, to enable this feature can
enhance the performance for some cpu architecure, such as SPARC and so on.
Currently it only supports one special cpu architecture(SPARC) in 82599
driver to enable RO feature, this is not very common for other cpu architecture
which really needs RO feature.
This patch add one common config CONFIG_ARCH_WANT_RELAX_ORDER to set RO feature,
and should define CONFIG_ARCH_WANT_RELAX_ORDER in sparc Kconfig firstly.

Signed-off-by: Mao Wenan <maowenan@huawei.com>
Reviewed-by: Alexander Duyck <alexander.duyck@gmail.com>
Reviewed-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 5 insertions, 1 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 99839c23d453..bd04eace455c 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -781,4 +781,7 @@ config VMAP_STACK
           the stack to map directly to the KASAN shadow map using a formula
           that is incorrect if the stack is in vmalloc space.
 
+config ARCH_WANT_RELAX_ORDER
+        bool
+
 source "kernel/gcov/Kconfig"
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index cf4034c66362..68ac5c7cd982 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -44,6 +44,7 @@ config SPARC
         select CPU_NO_EFFICIENT_FFS
         select HAVE_ARCH_HARDENED_USERCOPY
         select PROVE_LOCKING_SMALL if PROVE_LOCKING
+        select ARCH_WANT_RELAX_ORDER
 
 config SPARC32
         def_bool !64BIT
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
index 094e1d63309a..c38d50c1fcf7 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
@@ -350,7 +350,7 @@ s32 ixgbe_start_hw_gen2(struct ixgbe_hw *hw)
         }
         IXGBE_WRITE_FLUSH(hw);
 
-#ifndef CONFIG_SPARC
+#ifndef CONFIG_ARCH_WANT_RELAX_ORDER
         /* Disable relaxed ordering */
         for (i = 0; i < hw->mac.max_tx_queues; i++) {
                 u32 regval;