[dpdk-dev] net/e1000: correct mb function

[Xiao Zhang <xiao.zhang@intel.com>]

Use rte_cio_wmb instead of rte_wmb when writing TX descriptor since it's
CIO memory.
Replace rte_io_wmb and E1000_PCI_REG_WRITE_RELAXED with
E1000_PCI_REG_WRITE since it has rte_io_wmb inside, which will be more
clear.

Fixes: 1fc9701238ed ("net/e1000: fix i219 hang on reset/close")
Cc: stable@dpdk.org

Signed-off-by: Xiao Zhang <xiao.zhang@intel.com>
---
 drivers/net/e1000/em_rxtx.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/e1000/em_rxtx.c b/drivers/net/e1000/em_rxtx.c
index 5925e49..49c5371 100644
--- a/drivers/net/e1000/em_rxtx.c
+++ b/drivers/net/e1000/em_rxtx.c
@@ -2049,13 +2049,12 @@ e1000_flush_tx_ring(struct rte_eth_dev *dev)
 		tx_desc->lower.data = rte_cpu_to_le_32(txd_lower | size);
 		tx_desc->upper.data = 0;
 
-		rte_wmb();
+		rte_cio_wmb();
 		txq->tx_tail++;
 		if (txq->tx_tail == txq->nb_tx_desc)
 			txq->tx_tail = 0;
-		rte_io_wmb();
 		tdt_reg_addr = E1000_PCI_REG_ADDR(hw, E1000_TDT(i));
-		E1000_PCI_REG_WRITE_RELAXED(tdt_reg_addr, txq->tx_tail);
+		E1000_PCI_REG_WRITE(tdt_reg_addr, txq->tx_tail);
 		usec_delay(250);
 	}
 }
-- 
2.7.4