i40e: fix bug in dma sync

BugLink: http://bugs.launchpad.net/bugs/1547674

Driver was using an offset based off a DMA handle while mapping and
unmapping using sync_single_range_for[cpu|device], where it should
be using DMA handle (returned from alloc_coherent) and the offset of the
memory to be sync'd.

Change-ID: I208256565b1595ff0e9171ab852de06b997917c6
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Nelson, Shannon <shannon.nelson@intel.com>
Reviewed-by: Williams, Mitch A <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
(cherry picked from net-next commit 3578fa0a)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

drivers/net/ethernet/intel/i40e/i40e_txrx.c

@@ -1226,8 +1226,8 @@ void i40e_alloc_rx_buffers_ps(struct i40e_ring *rx_ring, u16 cleaned_count)
 		}
 
 		dma_sync_single_range_for_device(rx_ring->dev,
-						 bi->dma,
-						 0,
+						 rx_ring->rx_bi[0].dma,
+						 i * rx_ring->rx_hdr_len,
 						 rx_ring->rx_hdr_len,
 						 DMA_FROM_DEVICE);
 		/* Refresh the desc even if buffer_addrs didn't change
@@ -1542,8 +1542,8 @@ static int i40e_clean_rx_irq_ps(struct i40e_ring *rx_ring, int budget)
 			skb_record_rx_queue(skb, rx_ring->queue_index);
 			/* we are reusing so sync this buffer for CPU use */
 			dma_sync_single_range_for_cpu(rx_ring->dev,
-						      rx_bi->dma,
-						      0,
+						      rx_ring->rx_bi[0].dma,
+						      i * rx_ring->rx_hdr_len,
 						      rx_ring->rx_hdr_len,
 						      DMA_FROM_DEVICE);
 		}

drivers/net/ethernet/intel/i40evf/i40e_txrx.c

@@ -700,8 +700,8 @@ void i40evf_alloc_rx_buffers_ps(struct i40e_ring *rx_ring, u16 cleaned_count)
 		}
 
 		dma_sync_single_range_for_device(rx_ring->dev,
-						 bi->dma,
-						 0,
+						 rx_ring->rx_bi[0].dma,
+						 i * rx_ring->rx_hdr_len,
 						 rx_ring->rx_hdr_len,
 						 DMA_FROM_DEVICE);
 		/* Refresh the desc even if buffer_addrs didn't change
@@ -1007,8 +1007,8 @@ static int i40e_clean_rx_irq_ps(struct i40e_ring *rx_ring, int budget)
 			skb_record_rx_queue(skb, rx_ring->queue_index);
 			/* we are reusing so sync this buffer for CPU use */
 			dma_sync_single_range_for_cpu(rx_ring->dev,
-						      rx_bi->dma,
-						      0,
+						      rx_ring->rx_bi[0].dma,
+						      i * rx_ring->rx_hdr_len,
 						      rx_ring->rx_hdr_len,
 						      DMA_FROM_DEVICE);
 		}