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    Subject[RFC][PATCH v5 07/19] Add interface to get external buffers.
    Date
    From: Xin Xiaohui <xiaohui.xin@intel.com>

    Currently, it can get external buffers from mp device.

    Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
    Signed-off-by: Zhao Yu <yzhao81new@gmail.com>
    Reviewed-by: Jeff Dike <jdike@linux.intel.com>
    ---
    include/linux/skbuff.h | 12 ++++++++++++
    net/core/skbuff.c | 16 ++++++++++++++++
    2 files changed, 28 insertions(+), 0 deletions(-)

    diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
    index cf309c9..281a1c0 100644
    --- a/include/linux/skbuff.h
    +++ b/include/linux/skbuff.h
    @@ -1519,6 +1519,18 @@ static inline void netdev_free_page(struct net_device *dev, struct page *page)
    __free_page(page);
    }

    +extern struct skb_external_page *netdev_alloc_external_pages(
    + struct net_device *dev,
    + struct sk_buff *skb, int npages);
    +
    +static inline struct skb_external_page *netdev_alloc_external_page(
    + struct net_device *dev,
    + struct sk_buff *skb, unsigned int size)
    +{
    + return netdev_alloc_external_pages(dev, skb,
    + DIV_ROUND_UP(size, PAGE_SIZE));
    +}
    +
    /**
    * skb_clone_writable - is the header of a clone writable
    * @skb: buffer to check
    diff --git a/net/core/skbuff.c b/net/core/skbuff.c
    index 93c4e06..6345acc 100644
    --- a/net/core/skbuff.c
    +++ b/net/core/skbuff.c
    @@ -278,6 +278,22 @@ struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask)
    }
    EXPORT_SYMBOL(__netdev_alloc_page);

    +struct skb_external_page *netdev_alloc_external_pages(struct net_device *dev,
    + struct sk_buff *skb, int npages)
    +{
    + struct mpassthru_port *port;
    + struct skb_external_page *ext_page = NULL;
    +
    + port = rcu_dereference(dev->mp_port);
    + if (!port)
    + goto out;
    + BUG_ON(npages > port->npages);
    + ext_page = port->ctor(port, skb, npages);
    +out:
    + return ext_page;
    +}
    +EXPORT_SYMBOL(netdev_alloc_external_pages);
    +
    void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
    int size)
    {
    --
    1.5.4.4


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