From ceb8f6be7e5a254cb5b894be7a032170ec34607b Mon Sep 17 00:00:00 2001 From: "Lendacky, Thomas" Date: Fri, 20 Mar 2015 11:50:16 -0500 Subject: [PATCH] amd-xgbe: Use the new DMA memory barriers where appropriate Use the new lighter weight memory barriers when working with the device descriptors. Signed-off-by: Tom Lendacky Signed-off-by: David S. Miller --- drivers/net/ethernet/amd/xgbe/xgbe-dev.c | 15 +++++++++------ drivers/net/ethernet/amd/xgbe/xgbe-drv.c | 5 ++++- 2 files changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c index 29137c9e2200..e165d069d6b0 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c +++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c @@ -1068,7 +1068,7 @@ static void xgbe_tx_desc_reset(struct xgbe_ring_data *rdata) rdesc->desc3 = 0; /* Make sure ownership is written to the descriptor */ - wmb(); + dma_wmb(); } static void xgbe_tx_desc_init(struct xgbe_channel *channel) @@ -1124,12 +1124,12 @@ static void xgbe_rx_desc_reset(struct xgbe_ring_data *rdata) * is written to the descriptor(s) before setting the OWN bit * for the descriptor */ - wmb(); + dma_wmb(); XGMAC_SET_BITS_LE(rdesc->desc3, RX_NORMAL_DESC3, OWN, 1); /* Make sure ownership is written to the descriptor */ - wmb(); + dma_wmb(); } static void xgbe_rx_desc_init(struct xgbe_channel *channel) @@ -1358,6 +1358,9 @@ static void xgbe_tx_start_xmit(struct xgbe_channel *channel, struct xgbe_prv_data *pdata = channel->pdata; struct xgbe_ring_data *rdata; + /* Make sure everything is written before the register write */ + wmb(); + /* Issue a poll command to Tx DMA by writing address * of next immediate free descriptor */ rdata = XGBE_GET_DESC_DATA(ring, ring->cur); @@ -1565,7 +1568,7 @@ static void xgbe_dev_xmit(struct xgbe_channel *channel) * is written to the descriptor(s) before setting the OWN bit * for the first descriptor */ - wmb(); + dma_wmb(); /* Set OWN bit for the first descriptor */ rdata = XGBE_GET_DESC_DATA(ring, start_index); @@ -1577,7 +1580,7 @@ static void xgbe_dev_xmit(struct xgbe_channel *channel) #endif /* Make sure ownership is written to the descriptor */ - wmb(); + dma_wmb(); ring->cur = cur_index + 1; if (!packet->skb->xmit_more || @@ -1613,7 +1616,7 @@ static int xgbe_dev_read(struct xgbe_channel *channel) return 1; /* Make sure descriptor fields are read after reading the OWN bit */ - rmb(); + dma_rmb(); #ifdef XGMAC_ENABLE_RX_DESC_DUMP xgbe_dump_rx_desc(ring, rdesc, ring->cur); diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c index 885b02b5be07..8635c9484b3a 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c +++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c @@ -1800,6 +1800,9 @@ static void xgbe_rx_refresh(struct xgbe_channel *channel) ring->dirty++; } + /* Make sure everything is written before the register write */ + wmb(); + /* Update the Rx Tail Pointer Register with address of * the last cleaned entry */ rdata = XGBE_GET_DESC_DATA(ring, ring->dirty - 1); @@ -1863,7 +1866,7 @@ static int xgbe_tx_poll(struct xgbe_channel *channel) /* Make sure descriptor fields are read after reading the OWN * bit */ - rmb(); + dma_rmb(); #ifdef XGMAC_ENABLE_TX_DESC_DUMP xgbe_dump_tx_desc(ring, ring->dirty, 1, 0); -- 2.30.2