[dpdk-dev] [PATCH v3 2/2] net/i40e: replace SMP barrier with thread fence
From: Joyce Kong <hidden>
Date: 2021-07-06 06:55:17
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> Reviewed-by: Ruifeng Wang <redacted> --- 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