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    Subject[PATCH V5 2/6 net-next] netdevice.h: Add zero-copy flag in netdevice
    From
    Date
    Signed-off-by: Shirley Ma <xma@us.ibm.com>
    ---

    include/linux/netdevice.h | 10 ++++++++++
    1 files changed, 10 insertions(+), 0 deletions(-)

    diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
    index a134d80..2646251 100644
    --- a/include/linux/netdevice.h
    +++ b/include/linux/netdevice.h
    @@ -1066,6 +1066,16 @@ struct net_device {
    #define NETIF_F_NOCACHE_COPY (1 << 30) /* Use no-cache copyfromuser */
    #define NETIF_F_LOOPBACK (1 << 31) /* Enable loopback */

    +/*
    + * Bit 31 is for device to map userspace buffers -- zerocopy
    + * Device can set this flag when it supports HIGHDMA.
    + * Device can't recycle this kind of skb buffers.
    + * There are 256 bytes copied, the rest of buffers are mapped.
    + * The userspace callback should only be called when last reference to this skb
    + * is gone.
    + */
    +#define NETIF_F_ZEROCOPY (1 << 31)
    +
    /* Segmentation offload features */
    #define NETIF_F_GSO_SHIFT 16
    #define NETIF_F_GSO_MASK 0x00ff0000



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