Simply replace the SMP barrier with atomic thread fence for
i40e hw ring sacn, if there is no synchronization point.

Signed-off-by: Joyce Kong <joyce.k...@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.w...@arm.com>
---
 drivers/net/i40e/i40e_rxtx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_rxtx.c b/drivers/net/i40e/i40e_rxtx.c
index 9aaabfd92..86e2f083e 100644
--- a/drivers/net/i40e/i40e_rxtx.c
+++ b/drivers/net/i40e/i40e_rxtx.c
@@ -482,7 +482,8 @@ i40e_rx_scan_hw_ring(struct i40e_rx_queue *rxq)
                                        I40E_RXD_QW1_STATUS_SHIFT;
                }
 
-               rte_smp_rmb();
+               /* This barrier is to order loads of different words in the 
descriptor */
+               rte_atomic_thread_fence(__ATOMIC_ACQUIRE);
 
                /* Compute how many status bits were set */
                for (j = 0, nb_dd = 0; j < I40E_LOOK_AHEAD; j++) {
-- 
2.17.1

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