• Jesper Dangaard Brouer's avatar
    xdp: introduce xdp_return_frame_rx_napi · 389ab7f0
    Jesper Dangaard Brouer authored
    When sending an xdp_frame through xdp_do_redirect call, then error
    cases can happen where the xdp_frame needs to be dropped, and
    returning an -errno code isn't sufficient/possible any-longer
    (e.g. for cpumap case). This is already fully supported, by simply
    calling xdp_return_frame.
    This patch is an optimization, which provides xdp_return_frame_rx_napi,
    which is a faster variant for these error cases.  It take advantage of
    the protection provided by XDP RX running under NAPI protection.
    This change is mostly relevant for drivers using the page_pool
    allocator as it can take advantage of this. (Tested with mlx5).
    Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
    Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
page_pool.h 4.43 KB