From mboxrd@z Thu Jan 1 00:00:00 1970 From: Manish Chopra Subject: [PATCH net 1/1] qlge: Fix receive packets drop. Date: Tue, 15 Mar 2016 07:13:45 -0400 Message-ID: <1458040425-12937-1-git-send-email-manish.chopra@qlogic.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , To: Return-path: Received: from mx0b-0016ce01.pphosted.com ([67.231.156.153]:44304 "EHLO mx0b-0016ce01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934369AbcCOLyc (ORCPT ); Tue, 15 Mar 2016 07:54:32 -0400 Sender: netdev-owner@vger.kernel.org List-ID: 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 Signed-off-by: Manish Chopra --- drivers/net/ethernet/qlogic/qlge/qlge_main.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/net/ethernet/qlogic/qlge/qlge_main.c b/drivers/net/ethernet/qlogic/qlge/qlge_main.c index 9979764..b28e73e 100644 --- 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. */ -- 2.7.2