[dpdk-dev] [PATCH] 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_adminq.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/base/i40e_adminq.c b/drivers/net/i40e/base/i40e_adminq.c
index 0d3a83f..1038a95 100644
--- a/drivers/net/i40e/base/i40e_adminq.c
+++ b/drivers/net/i40e/base/i40e_adminq.c
@@ -832,6 +832,7 @@ enum i40e_status_code i40e_asq_send_command(struct i40e_hw *hw,
 	}
 
 	val = rd32(hw, hw->aq.asq.head);
+	rte_rmb();
 	if (val >= hw->aq.num_asq_entries) {
 		i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE,
 			   "AQTX: head overrun at %d\n", val);
@@ -929,8 +930,10 @@ enum i40e_status_code i40e_asq_send_command(struct i40e_hw *hw,
 	(hw->aq.asq.next_to_use)++;
 	if (hw->aq.asq.next_to_use == hw->aq.asq.count)
 		hw->aq.asq.next_to_use = 0;
-	if (!details->postpone)
+	if (!details->postpone) {
 		wr32(hw, hw->aq.asq.tail, hw->aq.asq.next_to_use);
+		rte_wmb();
+	}
 
 	/* if cmd_details are not defined or async flag is not set,
 	 * we need to wait for desc write back
-- 
2.7.4