[dpdk-stable] [PATCH v3 2/2] net/i40e: replace SMP barrier with thread fence
Joyce Kong
joyce.kong at arm.com
Tue Jul 6 08:54:04 CEST 2021
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.kong at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at 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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