[dpdk-dev] [PATCH v2] i40e: Fix eth_i40e_dev_init sequence on ThunderX

[Satha Rao]

i40e_asq_send_command: rd32 & wr32 under ThunderX gives unpredictable
                       results. To solve this include rte memory barriers

Signed-off-by: Satha Rao <skoteshwar at caviumnetworks.com>
---
 drivers/net/i40e/base/i40e_osdep.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/i40e/base/i40e_osdep.h b/drivers/net/i40e/base/i40e_osdep.h
index 38e7ba5..ffa3160 100644
--- a/drivers/net/i40e/base/i40e_osdep.h
+++ b/drivers/net/i40e/base/i40e_osdep.h
@@ -158,7 +158,13 @@ do {                                                            \
 	((volatile uint32_t *)((char *)(a)->hw_addr + (reg)))
 static inline uint32_t i40e_read_addr(volatile void *addr)
 {
+#if defined(RTE_ARCH_ARM64)
+	uint32_t val = rte_le_to_cpu_32(I40E_PCI_REG(addr));
+	rte_rmb();
+	return val;
+#else
 	return rte_le_to_cpu_32(I40E_PCI_REG(addr));
+#endif
 }
 #define I40E_PCI_REG_WRITE(reg, value) \
 	do { I40E_PCI_REG((reg)) = rte_cpu_to_le_32(value); } while (0)
@@ -171,8 +177,16 @@ static inline uint32_t i40e_read_addr(volatile void *addr)
 	I40E_PCI_REG_WRITE(I40E_PCI_REG_ADDR((hw), (reg)), (value))
 
 #define rd32(a, reg) i40e_read_addr(I40E_PCI_REG_ADDR((a), (reg)))
+#if defined(RTE_ARCH_ARM64)
+#define wr32(a, reg, value) \
+	do { \
+		I40E_PCI_REG_WRITE(I40E_PCI_REG_ADDR((a), (reg)), (value)); \
+		rte_wmb(); \
+	} while (0)
+#else
 #define wr32(a, reg, value) \
 	I40E_PCI_REG_WRITE(I40E_PCI_REG_ADDR((a), (reg)), (value))
+#endif
 #define flush(a) i40e_read_addr(I40E_PCI_REG_ADDR((a), (I40E_GLGEN_STAT)))
 
 #define ARRAY_SIZE(arr) (sizeof(arr)/sizeof(arr[0]))
-- 
2.7.4