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    SubjectRe: [PATCH V3 2/8] Add a new zerocopy device flag
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    On Wed, 2011-04-20 at 12:44 -0700, Shirley Ma wrote:
    > This zerocopy flag is used to support device DMA userspace buffers.
    >
    > Signed-off-by: Shirley Ma <xma@us.ibm.com>
    > ---
    >
    > include/linux/netdevice.h | 3 +++
    > 1 files changed, 3 insertions(+), 0 deletions(-)
    >
    > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
    > index 0249fe7..0998d3d 100644
    > --- a/include/linux/netdevice.h
    > +++ b/include/linux/netdevice.h
    > @@ -1067,6 +1067,9 @@ struct net_device {
    > #define NETIF_F_RXHASH (1 << 28) /* Receive hashing offload */
    > #define NETIF_F_RXCSUM (1 << 29) /* Receive checksumming offload */
    >
    > +/* bit 29 is for device to map userspace buffers -- zerocopy */
    > +#define NETIF_F_ZEROCOPY (1 << 29)

    Look above.

    Ben.

    > /* Segmentation offload features */
    > #define NETIF_F_GSO_SHIFT 16
    > #define NETIF_F_GSO_MASK 0x00ff0000
    >
    >
    > --
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    --
    Ben Hutchings, Senior Software Engineer, Solarflare
    Not speaking for my employer; that's the marketing department's job.
    They asked us to note that Solarflare product names are trademarked.



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