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  • Zoltan Kiss's avatar
    xen-netback: Stop using xenvif_tx_pending_slots_available · 869b9b19
    Zoltan Kiss authored
    Since the early days TX stops if there isn't enough free pending slots to
    consume a maximum sized (slot-wise) packet. Probably the reason for that is to
    avoid the case when we don't have enough free pending slot in the ring to finish
    the packet. But if we make sure that the pending ring has the same size as the
    shared ring, that shouldn't really happen. The frontend can only post packets
    which fit the to the free space of the shared ring. If it doesn't, the frontend
    has to stop, as it can only increase the req_prod when the whole packet fits
    onto the ring.
    This patch avoid using this checking, makes sure the 2 ring has the same size,
    and remove a checking from the callback. As now we don't stop the NAPI instance
    on this condition, we don't have to wake it up if we free pending slots up.
    Signed-off-by: default avatarZoltan Kiss <>
    Signed-off-by: default avatarDavid S. Miller <>