qlge: Fix receive packets drop.

[ Upstream commit 2c9a266afefe137bff06bbe0fc48b4d3b3cb348c ]

When running small packets [length < 256 bytes] traffic, packets were
being dropped due to invalid data in those packets which were
delivered by the driver upto the stack. Using pci_dma_sync_single_for_cpu
ensures copying latest and updated data into skb from the receive buffer.

Signed-off-by: Sony Chacko <sony.chacko@qlogic.com>
Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/ethernet/qlogic/qlge/qlge_main.c b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
index 078da66132d53e7d87613981624cab1e0d3b80fc..907a1c6d6e1f890abe278483e57036c98c7b742b 100644 (file)
--- a/drivers/net/ethernet/qlogic/qlge/qlge_main.c
+++ b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
@@ -1648,7 +1648,18 @@ static void ql_process_mac_rx_skb(struct ql_adapter *qdev,
                return;
        }
        skb_reserve(new_skb, NET_IP_ALIGN);
+
+       pci_dma_sync_single_for_cpu(qdev->pdev,
+                                   dma_unmap_addr(sbq_desc, mapaddr),
+                                   dma_unmap_len(sbq_desc, maplen),
+                                   PCI_DMA_FROMDEVICE);
+
        memcpy(skb_put(new_skb, length), skb->data, length);
+
+       pci_dma_sync_single_for_device(qdev->pdev,
+                                      dma_unmap_addr(sbq_desc, mapaddr),
+                                      dma_unmap_len(sbq_desc, maplen),
+                                      PCI_DMA_FROMDEVICE);
        skb = new_skb;
 
        /* Frame error, so drop the packet. */