[RFC,v2,2/7] net/mlx5: dmb for immediate doorbell ring on aarch64
diff mbox series

Message ID 20200410164127.54229-3-gavin.hu@arm.com
State New
Delegated to: Thomas Monjalon
Headers show
  • introduce new barrier class and use it for mlx5 PMD
Related show


Context Check Description
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Gavin Hu April 10, 2020, 4:41 p.m. UTC
A 'DMB' is enough to evict the merge buffer on aarch64,when the doorbell
register is mapped as 'Normal-NC', the counterpart of WC on x86.

Otherwise, it is mapped as Device memory, no barriers required at all.

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
 drivers/net/mlx5/mlx5_rxtx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff mbox series

diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index 939778aa5..e509f3b88 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -661,7 +661,7 @@  mlx5_tx_dbrec_cond_wmb(struct mlx5_txq_data *txq, volatile struct mlx5_wqe *wqe,
 	mlx5_uar_write64_relaxed(*src, dst, txq->uar_lock);
 	if (cond)
-		rte_wmb();
+		rte_dma_wmb();