• Maxime Chevallier's avatar
    net: mvpp2: cls: Add Classification offload support · 90b509b3
    Maxime Chevallier authored
    This commit introduces basic classification offloading support for the
    PPv2 controller.
    
    The PPv2 classifier has many classification engines, for now we only use
    the C2 TCAM match engine.
    
    This engine allows to perform ternary lookups on 64 bits keys (called
    Header Extracted Key), that are built by extracting fields from the packet
    header and concatenating them. At most 4 fields can be extracted for a
    single lookup.
    
    This basic implementation allows to build the HEK from the following
    fields :
     - L4 source and destination ports (for UDP and TCP)
    
    More fields are to be added in the future.
    
    Classification flows are added through the ethtool interface, using the
    newly introduced flow_rule infrastructure as an internal rule
    representation, allowing to more easily implement tc flower rules if
    need be.
    
    The internal design for now allocates one range of 4 rules per port
    due to the internal design of the flow table, which uses 22 sub-flows.
    
    When inserting a classification rule, the rule is created in every
    relevant sub-flow.
    
    This low rule-count is a very simple design which reaches quickly the
    limitations of the flow table ordering, but guarantees that the rule
    ordering will always be respected.
    
    This commit only introduces support for the "steer to rxq" action.
    Signed-off-by: default avatarMaxime Chevallier <maxime.chevallier@bootlin.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    90b509b3
mvpp2_cls.h 8.51 KB