tg3: Add memory barriers to sync BD data

for weak memory model architectures to ensure that the chip will DMA
valid BD data.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Reviewed-by: Benjamin Li <benli@broadcom.com>
Reviewed-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 4b3243b2bdf1..0da93dbbd0c8 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -5928,6 +5928,9 @@ next_pkt_nopost:
 
         /* Refill RX ring(s). */
         if (!tg3_flag(tp, ENABLE_RSS)) {
+                /* Sync BD data before updating mailbox */
+                wmb();
+
                 if (work_mask & RXD_OPAQUE_RING_STD) {
                         tpr->rx_std_prod_idx = std_prod_idx &
                                                tp->rx_std_ring_mask;
@@ -6970,6 +6973,9 @@ static netdev_tx_t tg3_start_xmit(struct sk_buff *skb, struct net_device *dev)
         skb_tx_timestamp(skb);
         netdev_sent_queue(tp->dev, skb->len);
 
+        /* Sync BD data before updating mailbox */
+        wmb();
+
         /* Packets are ready, update Tx producer idx local and on card. */
         tw32_tx_mbox(tnapi->prodmbox, entry);
 
@@ -11763,6 +11769,9 @@ static int tg3_run_loopback(struct tg3 *tp, u32 pktsz, bool tso_loopback)
 
         tnapi->tx_prod++;
 
+        /* Sync BD data before updating mailbox */
+        wmb();
+
         tw32_tx_mbox(tnapi->prodmbox, tnapi->tx_prod);
         tr32_mailbox(tnapi->prodmbox);