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qlge: Fix receive packets drop. 

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>
This commit is contained in:
Manish Chopra 2016-03-15 07:13:45 -04:00 committed by David S. Miller
parent cc2fa619a7
commit 2c9a266afe
1 changed files with 11 additions and 0 deletions
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11
drivers/net/ethernet/qlogic/qlge/qlge_main.c
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@ -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. */