[dpdk-dev] [PATCH 2/2] ixgbe: add memory barriers in vector rx/tx

[Eric Kinzie <ehkinzie@gmail.com>]

Add write memory barrier before writing tail pointer.

Fixes c95584dc2b18 ("ixgbe: new vectorized functions for Rx/Tx")

Signed-off-by: Eric Kinzie <ehkinzie@gmail.com>
---
 drivers/net/ixgbe/ixgbe_rxtx_vec.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec.c b/drivers/net/ixgbe/ixgbe_rxtx_vec.c
index abd10f6..b601de8 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx_vec.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx_vec.c
@@ -123,6 +123,7 @@ ixgbe_rxq_rearm(struct ixgbe_rx_queue *rxq)
 			     (rxq->nb_rx_desc - 1) : (rxq->rxrearm_start - 1));
 
 	/* Update the tail pointer on the NIC */
+	rte_wmb();
 	IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id);
 }
 
@@ -645,6 +646,8 @@ ixgbe_xmit_pkts_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
 
 	txq->tx_tail = tx_id;
 
+	/* update tail pointer */
+	rte_wmb();
 	IXGBE_PCI_REG_WRITE(txq->tdt_reg_addr, txq->tx_tail);
 
 	return nb_pkts;
-- 
1.7.10.4