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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 <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas 2015-03-20 11:50:16 -05:00 committed by David S. Miller
parent 600c8811d3
commit ceb8f6be7e
2 changed files with 13 additions and 7 deletions
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15
drivers/net/ethernet/amd/xgbe/xgbe-dev.c
View File

@ -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);

5
drivers/net/ethernet/amd/xgbe/xgbe-drv.c
View File

@ -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);