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    Subject[RFC PATCH v10 16/16]An example how to alloc user buffer based on napi_gro_frags() interface.
    Date
    From: Xin Xiaohui <xiaohui.xin@intel.com>

    This example is made on ixgbe driver which using napi_gro_frags().
    It can get buffers from guest side directly using netdev_alloc_page()
    and release guest buffers using netdev_free_page().

    ---
    drivers/net/ixgbe/ixgbe_main.c | 25 +++++++++++++++++++++----
    1 files changed, 21 insertions(+), 4 deletions(-)

    diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
    index 905d6d2..0977f2f 100644
    --- a/drivers/net/ixgbe/ixgbe_main.c
    +++ b/drivers/net/ixgbe/ixgbe_main.c
    @@ -691,7 +691,14 @@ static inline void ixgbe_release_rx_desc(struct ixgbe_hw *hw,
    static bool is_rx_buffer_mapped_as_page(struct ixgbe_rx_buffer *bi,
    struct net_device *dev)
    {
    - return true;
    + return dev_is_mpassthru(dev);
    +}
    +
    +static u32 get_page_skb_offset(struct net_device *dev)
    +{
    + if (!dev_is_mpassthru(dev))
    + return 0;
    + return dev->mp_port->vnet_hlen;
    }

    /**
    @@ -764,7 +771,8 @@ static void ixgbe_alloc_rx_buffers(struct ixgbe_adapter *adapter,
    adapter->alloc_rx_page_failed++;
    goto no_buffers;
    }
    - bi->page_skb_offset = 0;
    + bi->page_skb_offset =
    + get_page_skb_offset(adapter->netdev);
    bi->dma = pci_map_page(pdev, bi->page_skb,
    bi->page_skb_offset,
    (PAGE_SIZE / 2),
    @@ -899,8 +907,10 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
    len = le16_to_cpu(rx_desc->wb.upper.length);
    }

    - if (is_no_buffer(rx_buffer_info))
    + if (is_no_buffer(rx_buffer_info)) {
    + printk("no buffers\n");
    break;
    + }

    cleaned = true;

    @@ -959,6 +969,12 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
    rx_buffer_info->page_skb,
    rx_buffer_info->page_skb_offset,
    len);
    + if (dev_is_mpassthru(netdev) &&
    + netdev->mp_port->hash)
    + skb_shinfo(skb)->destructor_arg =
    + netdev->mp_port->hash(netdev,
    + rx_buffer_info->page_skb);
    +
    rx_buffer_info->page_skb = NULL;
    skb->len += len;
    skb->data_len += len;
    @@ -976,7 +992,8 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
    upper_len);

    if ((rx_ring->rx_buf_len > (PAGE_SIZE / 2)) ||
    - (page_count(rx_buffer_info->page) != 1))
    + (page_count(rx_buffer_info->page) != 1) ||
    + dev_is_mpassthru(netdev))
    rx_buffer_info->page = NULL;
    else
    get_page(rx_buffer_info->page);
    --
    1.5.4.4


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