amd-xgbe: Add a read memory barrier to Tx/Rx path

Add a read memory barrier to the Tx and Rx paths where the ownership
bit is checked to be sure that all descriptor fields are read after
having read the ownership bit for the descriptor.

This has not been an issue to date, but it's a good safe-guard to have.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
index f6014d330b2e..9b1d9fa68257 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
@@ -1558,6 +1558,9 @@ static int xgbe_dev_read(struct xgbe_channel *channel)
         if (XGMAC_GET_BITS_LE(rdesc->desc3, RX_NORMAL_DESC3, OWN))
                 return 1;
 
+        /* Make sure descriptor fields are read after reading the OWN bit */
+        rmb();
+
 #ifdef XGMAC_ENABLE_RX_DESC_DUMP
         xgbe_dump_rx_desc(ring, rdesc, ring->cur);
 #endif
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
index 0544931329d1..eebb787251c4 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
@@ -1791,6 +1791,10 @@ static int xgbe_tx_poll(struct xgbe_channel *channel)
                 if (!hw_if->tx_complete(rdesc))
                         break;
 
+                /* Make sure descriptor fields are read after reading the OWN
+                 * bit */
+                rmb();
+
 #ifdef XGMAC_ENABLE_TX_DESC_DUMP
                 xgbe_dump_tx_desc(ring, ring->dirty, 1, 0);
 #endif