• J
    nfp: bpf: perf event output helpers support · 9816dd35
    Jakub Kicinski 提交于
    Add support for the perf_event_output family of helpers.
    
    The implementation on the NFP will not match the host code exactly.
    The state of the host map and rings is unknown to the device, hence
    device can't return errors when rings are not installed.  The device
    simply packs the data into a firmware notification message and sends
    it over to the host, returning success to the program.
    
    There is no notion of a host CPU on the device when packets are being
    processed.  Device will only offload programs which set BPF_F_CURRENT_CPU.
    Still, if map index doesn't match CPU no error will be returned (see
    above).
    
    Dropped/lost firmware notification messages will not cause "lost
    events" event on the perf ring, they are only visible via device
    error counters.
    
    Firmware notification messages may also get reordered in respect
    to the packets which caused their generation.
    Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com>
    Reviewed-by: NQuentin Monnet <quentin.monnet@netronome.com>
    Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
    9816dd35
offload.c 14.7 KB