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  • Amir Vadai's avatar
    net/mlx4_en: Add accelerated RFS support · 1eb8c695
    Amir Vadai authored
    Use RFS infrastructure and flow steering in HW to keep CPU
    affinity of rx interrupts and application per TCP stream.
    A flow steering filter is added to the HW whenever the RFS
    ndo callback is invoked by core networking code.
    Because the invocation takes place in interrupt context, the
    actual setup of HW is done using workqueue. Whenever new filter
    is added, the driver checks for expiry of existing filters.
    Since there's window in time between the point where the core
    RFS code invoked the ndo callback, to the point where the HW
    is configured from the workqueue context, the 2nd, 3rd etc
    packets from that stream will cause the net core to invoke
    the callback again and again.
    To prevent inefficient/double configuration of the HW, the filters
    are kept in a database which is indexed using hash function to enable
    fast access.
    Signed-off-by: default avatarAmir Vadai <>
    Signed-off-by: default avatarOr Gerlitz <>
    Signed-off-by: default avatarDavid S. Miller <>